From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/xfrm/Kconfig | 140 ++ net/xfrm/Makefile | 17 + net/xfrm/espintcp.c | 579 ++++++ net/xfrm/xfrm_algo.c | 866 ++++++++ net/xfrm/xfrm_compat.c | 675 ++++++ net/xfrm/xfrm_device.c | 444 ++++ net/xfrm/xfrm_hash.c | 40 + net/xfrm/xfrm_hash.h | 199 ++ net/xfrm/xfrm_inout.h | 70 + net/xfrm/xfrm_input.c | 834 ++++++++ net/xfrm/xfrm_interface_core.c | 1242 +++++++++++ net/xfrm/xfrm_ipcomp.c | 378 ++++ net/xfrm/xfrm_output.c | 909 ++++++++ net/xfrm/xfrm_policy.c | 4490 ++++++++++++++++++++++++++++++++++++++++ net/xfrm/xfrm_proc.c | 75 + net/xfrm/xfrm_replay.c | 795 +++++++ net/xfrm/xfrm_state.c | 2933 ++++++++++++++++++++++++++ net/xfrm/xfrm_sysctl.c | 87 + net/xfrm/xfrm_user.c | 3830 ++++++++++++++++++++++++++++++++++ 19 files changed, 18603 insertions(+) create mode 100644 net/xfrm/Kconfig create mode 100644 net/xfrm/Makefile create mode 100644 net/xfrm/espintcp.c create mode 100644 net/xfrm/xfrm_algo.c create mode 100644 net/xfrm/xfrm_compat.c create mode 100644 net/xfrm/xfrm_device.c create mode 100644 net/xfrm/xfrm_hash.c create mode 100644 net/xfrm/xfrm_hash.h create mode 100644 net/xfrm/xfrm_inout.h create mode 100644 net/xfrm/xfrm_input.c create mode 100644 net/xfrm/xfrm_interface_core.c create mode 100644 net/xfrm/xfrm_ipcomp.c create mode 100644 net/xfrm/xfrm_output.c create mode 100644 net/xfrm/xfrm_policy.c create mode 100644 net/xfrm/xfrm_proc.c create mode 100644 net/xfrm/xfrm_replay.c create mode 100644 net/xfrm/xfrm_state.c create mode 100644 net/xfrm/xfrm_sysctl.c create mode 100644 net/xfrm/xfrm_user.c (limited to 'net/xfrm') diff --git a/net/xfrm/Kconfig b/net/xfrm/Kconfig new file mode 100644 index 000000000..3adf31a83 --- /dev/null +++ b/net/xfrm/Kconfig @@ -0,0 +1,140 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# XFRM configuration +# +config XFRM + bool + depends on INET + select GRO_CELLS + select SKB_EXTENSIONS + +config XFRM_OFFLOAD + bool + +config XFRM_ALGO + tristate + select XFRM + select CRYPTO + select CRYPTO_HASH + select CRYPTO_SKCIPHER + +if INET +config XFRM_USER + tristate "Transformation user configuration interface" + select XFRM_ALGO + help + Support for Transformation(XFRM) user configuration interface + like IPsec used by native Linux tools. + + If unsure, say Y. + +config XFRM_USER_COMPAT + tristate "Compatible ABI support" + depends on XFRM_USER && COMPAT_FOR_U64_ALIGNMENT && \ + HAVE_EFFICIENT_UNALIGNED_ACCESS + select WANT_COMPAT_NETLINK_MESSAGES + help + Transformation(XFRM) user configuration interface like IPsec + used by compatible Linux applications. + + If unsure, say N. + +config XFRM_INTERFACE + tristate "Transformation virtual interface" + depends on XFRM && IPV6 + help + This provides a virtual interface to route IPsec traffic. + + If unsure, say N. + +config XFRM_SUB_POLICY + bool "Transformation sub policy support" + depends on XFRM + help + Support sub policy for developers. By using sub policy with main + one, two policies can be applied to the same packet at once. + Policy which lives shorter time in kernel should be a sub. + + If unsure, say N. + +config XFRM_MIGRATE + bool "Transformation migrate database" + depends on XFRM + help + A feature to update locator(s) of a given IPsec security + association dynamically. This feature is required, for + instance, in a Mobile IPv6 environment with IPsec configuration + where mobile nodes change their attachment point to the Internet. + + If unsure, say N. + +config XFRM_STATISTICS + bool "Transformation statistics" + depends on XFRM && PROC_FS + help + This statistics is not a SNMP/MIB specification but shows + statistics about transformation error (or almost error) factor + at packet processing for developer. + + If unsure, say N. + +# This option selects XFRM_ALGO along with the AH authentication algorithms that +# RFC 8221 lists as MUST be implemented. +config XFRM_AH + tristate + select XFRM_ALGO + select CRYPTO + select CRYPTO_HMAC + select CRYPTO_SHA256 + +# This option selects XFRM_ALGO along with the ESP encryption and authentication +# algorithms that RFC 8221 lists as MUST be implemented. +config XFRM_ESP + tristate + select XFRM_ALGO + select CRYPTO + select CRYPTO_AES + select CRYPTO_AUTHENC + select CRYPTO_CBC + select CRYPTO_ECHAINIV + select CRYPTO_GCM + select CRYPTO_HMAC + select CRYPTO_SEQIV + select CRYPTO_SHA256 + +config XFRM_IPCOMP + tristate + select XFRM_ALGO + select CRYPTO + select CRYPTO_DEFLATE + +config NET_KEY + tristate "PF_KEY sockets" + select XFRM_ALGO + help + PF_KEYv2 socket family, compatible to KAME ones. + They are required if you are going to use IPsec tools ported + from KAME. + + Say Y unless you know what you are doing. + +config NET_KEY_MIGRATE + bool "PF_KEY MIGRATE" + depends on NET_KEY + select XFRM_MIGRATE + help + Add a PF_KEY MIGRATE message to PF_KEYv2 socket family. + The PF_KEY MIGRATE message is used to dynamically update + locator(s) of a given IPsec security association. + This feature is required, for instance, in a Mobile IPv6 + environment with IPsec configuration where mobile nodes + change their attachment point to the Internet. Detail + information can be found in the internet-draft + . + + If unsure, say N. + +config XFRM_ESPINTCP + bool + +endif # INET diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile new file mode 100644 index 000000000..08a2870fd --- /dev/null +++ b/net/xfrm/Makefile @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the XFRM subsystem. +# + +xfrm_interface-$(CONFIG_XFRM_INTERFACE) += xfrm_interface_core.o + +obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \ + xfrm_input.o xfrm_output.o \ + xfrm_sysctl.o xfrm_replay.o xfrm_device.o +obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o +obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o +obj-$(CONFIG_XFRM_USER) += xfrm_user.o +obj-$(CONFIG_XFRM_USER_COMPAT) += xfrm_compat.o +obj-$(CONFIG_XFRM_IPCOMP) += xfrm_ipcomp.o +obj-$(CONFIG_XFRM_INTERFACE) += xfrm_interface.o +obj-$(CONFIG_XFRM_ESPINTCP) += espintcp.o diff --git a/net/xfrm/espintcp.c b/net/xfrm/espintcp.c new file mode 100644 index 000000000..d6fece1ed --- /dev/null +++ b/net/xfrm/espintcp.c @@ -0,0 +1,579 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#if IS_ENABLED(CONFIG_IPV6) +#include +#endif + +static void handle_nonesp(struct espintcp_ctx *ctx, struct sk_buff *skb, + struct sock *sk) +{ + if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf || + !sk_rmem_schedule(sk, skb, skb->truesize)) { + XFRM_INC_STATS(sock_net(sk), LINUX_MIB_XFRMINERROR); + kfree_skb(skb); + return; + } + + skb_set_owner_r(skb, sk); + + memset(skb->cb, 0, sizeof(skb->cb)); + skb_queue_tail(&ctx->ike_queue, skb); + ctx->saved_data_ready(sk); +} + +static void handle_esp(struct sk_buff *skb, struct sock *sk) +{ + struct tcp_skb_cb *tcp_cb = (struct tcp_skb_cb *)skb->cb; + + skb_reset_transport_header(skb); + + /* restore IP CB, we need at least IP6CB->nhoff */ + memmove(skb->cb, &tcp_cb->header, sizeof(tcp_cb->header)); + + rcu_read_lock(); + skb->dev = dev_get_by_index_rcu(sock_net(sk), skb->skb_iif); + local_bh_disable(); +#if IS_ENABLED(CONFIG_IPV6) + if (sk->sk_family == AF_INET6) + ipv6_stub->xfrm6_rcv_encap(skb, IPPROTO_ESP, 0, TCP_ENCAP_ESPINTCP); + else +#endif + xfrm4_rcv_encap(skb, IPPROTO_ESP, 0, TCP_ENCAP_ESPINTCP); + local_bh_enable(); + rcu_read_unlock(); +} + +static void espintcp_rcv(struct strparser *strp, struct sk_buff *skb) +{ + struct espintcp_ctx *ctx = container_of(strp, struct espintcp_ctx, + strp); + struct strp_msg *rxm = strp_msg(skb); + int len = rxm->full_len - 2; + u32 nonesp_marker; + int err; + + /* keepalive packet? */ + if (unlikely(len == 1)) { + u8 data; + + err = skb_copy_bits(skb, rxm->offset + 2, &data, 1); + if (err < 0) { + XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); + kfree_skb(skb); + return; + } + + if (data == 0xff) { + kfree_skb(skb); + return; + } + } + + /* drop other short messages */ + if (unlikely(len <= sizeof(nonesp_marker))) { + XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); + kfree_skb(skb); + return; + } + + err = skb_copy_bits(skb, rxm->offset + 2, &nonesp_marker, + sizeof(nonesp_marker)); + if (err < 0) { + XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINHDRERROR); + kfree_skb(skb); + return; + } + + /* remove header, leave non-ESP marker/SPI */ + if (!pskb_pull(skb, rxm->offset + 2)) { + XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINERROR); + kfree_skb(skb); + return; + } + + if (pskb_trim(skb, rxm->full_len - 2) != 0) { + XFRM_INC_STATS(sock_net(strp->sk), LINUX_MIB_XFRMINERROR); + kfree_skb(skb); + return; + } + + if (nonesp_marker == 0) + handle_nonesp(ctx, skb, strp->sk); + else + handle_esp(skb, strp->sk); +} + +static int espintcp_parse(struct strparser *strp, struct sk_buff *skb) +{ + struct strp_msg *rxm = strp_msg(skb); + __be16 blen; + u16 len; + int err; + + if (skb->len < rxm->offset + 2) + return 0; + + err = skb_copy_bits(skb, rxm->offset, &blen, sizeof(blen)); + if (err < 0) + return err; + + len = be16_to_cpu(blen); + if (len < 2) + return -EINVAL; + + return len; +} + +static int espintcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int flags, int *addr_len) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct sk_buff *skb; + int err = 0; + int copied; + int off = 0; + + skb = __skb_recv_datagram(sk, &ctx->ike_queue, flags, &off, &err); + if (!skb) { + if (err == -EAGAIN && sk->sk_shutdown & RCV_SHUTDOWN) + return 0; + return err; + } + + copied = len; + if (copied > skb->len) + copied = skb->len; + else if (copied < skb->len) + msg->msg_flags |= MSG_TRUNC; + + err = skb_copy_datagram_msg(skb, 0, msg, copied); + if (unlikely(err)) { + kfree_skb(skb); + return err; + } + + if (flags & MSG_TRUNC) + copied = skb->len; + kfree_skb(skb); + return copied; +} + +int espintcp_queue_out(struct sock *sk, struct sk_buff *skb) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + + if (skb_queue_len(&ctx->out_queue) >= READ_ONCE(netdev_max_backlog)) + return -ENOBUFS; + + __skb_queue_tail(&ctx->out_queue, skb); + + return 0; +} +EXPORT_SYMBOL_GPL(espintcp_queue_out); + +/* espintcp length field is 2B and length includes the length field's size */ +#define MAX_ESPINTCP_MSG (((1 << 16) - 1) - 2) + +static int espintcp_sendskb_locked(struct sock *sk, struct espintcp_msg *emsg, + int flags) +{ + do { + int ret; + + ret = skb_send_sock_locked(sk, emsg->skb, + emsg->offset, emsg->len); + if (ret < 0) + return ret; + + emsg->len -= ret; + emsg->offset += ret; + } while (emsg->len > 0); + + kfree_skb(emsg->skb); + memset(emsg, 0, sizeof(*emsg)); + + return 0; +} + +static int espintcp_sendskmsg_locked(struct sock *sk, + struct espintcp_msg *emsg, int flags) +{ + struct sk_msg *skmsg = &emsg->skmsg; + struct scatterlist *sg; + int done = 0; + int ret; + + flags |= MSG_SENDPAGE_NOTLAST; + sg = &skmsg->sg.data[skmsg->sg.start]; + do { + size_t size = sg->length - emsg->offset; + int offset = sg->offset + emsg->offset; + struct page *p; + + emsg->offset = 0; + + if (sg_is_last(sg)) + flags &= ~MSG_SENDPAGE_NOTLAST; + + p = sg_page(sg); +retry: + ret = do_tcp_sendpages(sk, p, offset, size, flags); + if (ret < 0) { + emsg->offset = offset - sg->offset; + skmsg->sg.start += done; + return ret; + } + + if (ret != size) { + offset += ret; + size -= ret; + goto retry; + } + + done++; + put_page(p); + sk_mem_uncharge(sk, sg->length); + sg = sg_next(sg); + } while (sg); + + memset(emsg, 0, sizeof(*emsg)); + + return 0; +} + +static int espintcp_push_msgs(struct sock *sk, int flags) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct espintcp_msg *emsg = &ctx->partial; + int err; + + if (!emsg->len) + return 0; + + if (ctx->tx_running) + return -EAGAIN; + ctx->tx_running = 1; + + if (emsg->skb) + err = espintcp_sendskb_locked(sk, emsg, flags); + else + err = espintcp_sendskmsg_locked(sk, emsg, flags); + if (err == -EAGAIN) { + ctx->tx_running = 0; + return flags & MSG_DONTWAIT ? -EAGAIN : 0; + } + if (!err) + memset(emsg, 0, sizeof(*emsg)); + + ctx->tx_running = 0; + + return err; +} + +int espintcp_push_skb(struct sock *sk, struct sk_buff *skb) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct espintcp_msg *emsg = &ctx->partial; + unsigned int len; + int offset; + + if (sk->sk_state != TCP_ESTABLISHED) { + kfree_skb(skb); + return -ECONNRESET; + } + + offset = skb_transport_offset(skb); + len = skb->len - offset; + + espintcp_push_msgs(sk, 0); + + if (emsg->len) { + kfree_skb(skb); + return -ENOBUFS; + } + + skb_set_owner_w(skb, sk); + + emsg->offset = offset; + emsg->len = len; + emsg->skb = skb; + + espintcp_push_msgs(sk, 0); + + return 0; +} +EXPORT_SYMBOL_GPL(espintcp_push_skb); + +static int espintcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) +{ + long timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct espintcp_msg *emsg = &ctx->partial; + struct iov_iter pfx_iter; + struct kvec pfx_iov = {}; + size_t msglen = size + 2; + char buf[2] = {0}; + int err, end; + + if (msg->msg_flags & ~MSG_DONTWAIT) + return -EOPNOTSUPP; + + if (size > MAX_ESPINTCP_MSG) + return -EMSGSIZE; + + if (msg->msg_controllen) + return -EOPNOTSUPP; + + lock_sock(sk); + + err = espintcp_push_msgs(sk, msg->msg_flags & MSG_DONTWAIT); + if (err < 0) { + if (err != -EAGAIN || !(msg->msg_flags & MSG_DONTWAIT)) + err = -ENOBUFS; + goto unlock; + } + + sk_msg_init(&emsg->skmsg); + while (1) { + /* only -ENOMEM is possible since we don't coalesce */ + err = sk_msg_alloc(sk, &emsg->skmsg, msglen, 0); + if (!err) + break; + + err = sk_stream_wait_memory(sk, &timeo); + if (err) + goto fail; + } + + *((__be16 *)buf) = cpu_to_be16(msglen); + pfx_iov.iov_base = buf; + pfx_iov.iov_len = sizeof(buf); + iov_iter_kvec(&pfx_iter, ITER_SOURCE, &pfx_iov, 1, pfx_iov.iov_len); + + err = sk_msg_memcopy_from_iter(sk, &pfx_iter, &emsg->skmsg, + pfx_iov.iov_len); + if (err < 0) + goto fail; + + err = sk_msg_memcopy_from_iter(sk, &msg->msg_iter, &emsg->skmsg, size); + if (err < 0) + goto fail; + + end = emsg->skmsg.sg.end; + emsg->len = size; + sk_msg_iter_var_prev(end); + sg_mark_end(sk_msg_elem(&emsg->skmsg, end)); + + tcp_rate_check_app_limited(sk); + + err = espintcp_push_msgs(sk, msg->msg_flags & MSG_DONTWAIT); + /* this message could be partially sent, keep it */ + + release_sock(sk); + + return size; + +fail: + sk_msg_free(sk, &emsg->skmsg); + memset(emsg, 0, sizeof(*emsg)); +unlock: + release_sock(sk); + return err; +} + +static struct proto espintcp_prot __ro_after_init; +static struct proto_ops espintcp_ops __ro_after_init; +static struct proto espintcp6_prot; +static struct proto_ops espintcp6_ops; +static DEFINE_MUTEX(tcpv6_prot_mutex); + +static void espintcp_data_ready(struct sock *sk) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + + strp_data_ready(&ctx->strp); +} + +static void espintcp_tx_work(struct work_struct *work) +{ + struct espintcp_ctx *ctx = container_of(work, + struct espintcp_ctx, work); + struct sock *sk = ctx->strp.sk; + + lock_sock(sk); + if (!ctx->tx_running) + espintcp_push_msgs(sk, 0); + release_sock(sk); +} + +static void espintcp_write_space(struct sock *sk) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + + schedule_work(&ctx->work); + ctx->saved_write_space(sk); +} + +static void espintcp_destruct(struct sock *sk) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + + ctx->saved_destruct(sk); + kfree(ctx); +} + +bool tcp_is_ulp_esp(struct sock *sk) +{ + return sk->sk_prot == &espintcp_prot || sk->sk_prot == &espintcp6_prot; +} +EXPORT_SYMBOL_GPL(tcp_is_ulp_esp); + +static void build_protos(struct proto *espintcp_prot, + struct proto_ops *espintcp_ops, + const struct proto *orig_prot, + const struct proto_ops *orig_ops); +static int espintcp_init_sk(struct sock *sk) +{ + struct inet_connection_sock *icsk = inet_csk(sk); + struct strp_callbacks cb = { + .rcv_msg = espintcp_rcv, + .parse_msg = espintcp_parse, + }; + struct espintcp_ctx *ctx; + int err; + + /* sockmap is not compatible with espintcp */ + if (sk->sk_user_data) + return -EBUSY; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + err = strp_init(&ctx->strp, sk, &cb); + if (err) + goto free; + + __sk_dst_reset(sk); + + strp_check_rcv(&ctx->strp); + skb_queue_head_init(&ctx->ike_queue); + skb_queue_head_init(&ctx->out_queue); + + if (sk->sk_family == AF_INET) { + sk->sk_prot = &espintcp_prot; + sk->sk_socket->ops = &espintcp_ops; + } else { + mutex_lock(&tcpv6_prot_mutex); + if (!espintcp6_prot.recvmsg) + build_protos(&espintcp6_prot, &espintcp6_ops, sk->sk_prot, sk->sk_socket->ops); + mutex_unlock(&tcpv6_prot_mutex); + + sk->sk_prot = &espintcp6_prot; + sk->sk_socket->ops = &espintcp6_ops; + } + ctx->saved_data_ready = sk->sk_data_ready; + ctx->saved_write_space = sk->sk_write_space; + ctx->saved_destruct = sk->sk_destruct; + sk->sk_data_ready = espintcp_data_ready; + sk->sk_write_space = espintcp_write_space; + sk->sk_destruct = espintcp_destruct; + rcu_assign_pointer(icsk->icsk_ulp_data, ctx); + INIT_WORK(&ctx->work, espintcp_tx_work); + + /* avoid using task_frag */ + sk->sk_allocation = GFP_ATOMIC; + + return 0; + +free: + kfree(ctx); + return err; +} + +static void espintcp_release(struct sock *sk) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct sk_buff_head queue; + struct sk_buff *skb; + + __skb_queue_head_init(&queue); + skb_queue_splice_init(&ctx->out_queue, &queue); + + while ((skb = __skb_dequeue(&queue))) + espintcp_push_skb(sk, skb); + + tcp_release_cb(sk); +} + +static void espintcp_close(struct sock *sk, long timeout) +{ + struct espintcp_ctx *ctx = espintcp_getctx(sk); + struct espintcp_msg *emsg = &ctx->partial; + + strp_stop(&ctx->strp); + + sk->sk_prot = &tcp_prot; + barrier(); + + cancel_work_sync(&ctx->work); + strp_done(&ctx->strp); + + skb_queue_purge(&ctx->out_queue); + skb_queue_purge(&ctx->ike_queue); + + if (emsg->len) { + if (emsg->skb) + kfree_skb(emsg->skb); + else + sk_msg_free(sk, &emsg->skmsg); + } + + tcp_close(sk, timeout); +} + +static __poll_t espintcp_poll(struct file *file, struct socket *sock, + poll_table *wait) +{ + __poll_t mask = datagram_poll(file, sock, wait); + struct sock *sk = sock->sk; + struct espintcp_ctx *ctx = espintcp_getctx(sk); + + if (!skb_queue_empty(&ctx->ike_queue)) + mask |= EPOLLIN | EPOLLRDNORM; + + return mask; +} + +static void build_protos(struct proto *espintcp_prot, + struct proto_ops *espintcp_ops, + const struct proto *orig_prot, + const struct proto_ops *orig_ops) +{ + memcpy(espintcp_prot, orig_prot, sizeof(struct proto)); + memcpy(espintcp_ops, orig_ops, sizeof(struct proto_ops)); + espintcp_prot->sendmsg = espintcp_sendmsg; + espintcp_prot->recvmsg = espintcp_recvmsg; + espintcp_prot->close = espintcp_close; + espintcp_prot->release_cb = espintcp_release; + espintcp_ops->poll = espintcp_poll; +} + +static struct tcp_ulp_ops espintcp_ulp __read_mostly = { + .name = "espintcp", + .owner = THIS_MODULE, + .init = espintcp_init_sk, +}; + +void __init espintcp_init(void) +{ + build_protos(&espintcp_prot, &espintcp_ops, &tcp_prot, &inet_stream_ops); + + tcp_register_ulp(&espintcp_ulp); +} diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c new file mode 100644 index 000000000..094734fbe --- /dev/null +++ b/net/xfrm/xfrm_algo.c @@ -0,0 +1,866 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * xfrm algorithm interface + * + * Copyright (c) 2002 James Morris + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#if IS_ENABLED(CONFIG_INET_ESP) || IS_ENABLED(CONFIG_INET6_ESP) +#include +#endif + +/* + * Algorithms supported by IPsec. These entries contain properties which + * are used in key negotiation and xfrm processing, and are used to verify + * that instantiated crypto transforms have correct parameters for IPsec + * purposes. + */ +static struct xfrm_algo_desc aead_list[] = { +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 96, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 96, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4543(gcm(aes))", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_NULL_AES_GMAC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc7539esp(chacha20,poly1305)", + + .uinfo = { + .aead = { + .geniv = "seqiv", + .icv_truncbits = 128, + } + }, + + .pfkey_supported = 0, +}, +}; + +static struct xfrm_algo_desc aalg_list[] = { +{ + .name = "digest_null", + + .uinfo = { + .auth = { + .icv_truncbits = 0, + .icv_fullbits = 0, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "hmac(md5)", + .compat = "md5", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_AALG_MD5HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "hmac(sha1)", + .compat = "sha1", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_AALG_SHA1HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "hmac(sha256)", + .compat = "sha256", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 256, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 256, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "hmac(sha384)", + + .uinfo = { + .auth = { + .icv_truncbits = 192, + .icv_fullbits = 384, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_384HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 384, + .sadb_alg_maxbits = 384 + } +}, +{ + .name = "hmac(sha512)", + + .uinfo = { + .auth = { + .icv_truncbits = 256, + .icv_fullbits = 512, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_512HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 512, + .sadb_alg_maxbits = 512 + } +}, +{ + .name = "hmac(rmd160)", + .compat = "rmd160", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "xcbc(aes)", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +{ + /* rfc4494 */ + .name = "cmac(aes)", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .pfkey_supported = 0, +}, +{ + .name = "hmac(sm3)", + .compat = "sm3", + + .uinfo = { + .auth = { + .icv_truncbits = 256, + .icv_fullbits = 256, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SM3_256HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 256, + .sadb_alg_maxbits = 256 + } +}, +}; + +static struct xfrm_algo_desc ealg_list[] = { +{ + .name = "ecb(cipher_null)", + .compat = "cipher_null", + + .uinfo = { + .encr = { + .blockbits = 8, + .defkeybits = 0, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "cbc(des)", + .compat = "des", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 64, + .defkeybits = 64, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 64, + .sadb_alg_maxbits = 64 + } +}, +{ + .name = "cbc(des3_ede)", + .compat = "des3_ede", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 64, + .defkeybits = 192, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_EALG_3DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 192, + .sadb_alg_maxbits = 192 + } +}, +{ + .name = "cbc(cast5)", + .compat = "cast5", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 64, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CASTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "cbc(blowfish)", + .compat = "blowfish", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 64, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 448 + } +}, +{ + .name = "cbc(aes)", + .compat = "aes", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(serpent)", + .compat = "serpent", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_SERPENTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256, + } +}, +{ + .name = "cbc(camellia)", + .compat = "camellia", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CAMELLIACBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(twofish)", + .compat = "twofish", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_TWOFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc3686(ctr(aes))", + + .uinfo = { + .encr = { + .geniv = "seqiv", + .blockbits = 128, + .defkeybits = 160, /* 128-bit key + 32-bit nonce */ + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCTR, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 288 + } +}, +{ + .name = "cbc(sm4)", + .compat = "sm4", + + .uinfo = { + .encr = { + .geniv = "echainiv", + .blockbits = 128, + .defkeybits = 128, + } + }, + + .pfkey_supported = 1, + + .desc = { + .sadb_alg_id = SADB_X_EALG_SM4CBC, + .sadb_alg_ivlen = 16, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +}; + +static struct xfrm_algo_desc calg_list[] = { +{ + .name = "deflate", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE } +}, +{ + .name = "lzs", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_LZS } +}, +{ + .name = "lzjh", + .uinfo = { + .comp = { + .threshold = 50, + } + }, + .pfkey_supported = 1, + .desc = { .sadb_alg_id = SADB_X_CALG_LZJH } +}, +}; + +static inline int aalg_entries(void) +{ + return ARRAY_SIZE(aalg_list); +} + +static inline int ealg_entries(void) +{ + return ARRAY_SIZE(ealg_list); +} + +static inline int calg_entries(void) +{ + return ARRAY_SIZE(calg_list); +} + +struct xfrm_algo_list { + struct xfrm_algo_desc *algs; + int entries; + u32 type; + u32 mask; +}; + +static const struct xfrm_algo_list xfrm_aead_list = { + .algs = aead_list, + .entries = ARRAY_SIZE(aead_list), + .type = CRYPTO_ALG_TYPE_AEAD, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static const struct xfrm_algo_list xfrm_aalg_list = { + .algs = aalg_list, + .entries = ARRAY_SIZE(aalg_list), + .type = CRYPTO_ALG_TYPE_HASH, + .mask = CRYPTO_ALG_TYPE_HASH_MASK, +}; + +static const struct xfrm_algo_list xfrm_ealg_list = { + .algs = ealg_list, + .entries = ARRAY_SIZE(ealg_list), + .type = CRYPTO_ALG_TYPE_SKCIPHER, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static const struct xfrm_algo_list xfrm_calg_list = { + .algs = calg_list, + .entries = ARRAY_SIZE(calg_list), + .type = CRYPTO_ALG_TYPE_COMPRESS, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static struct xfrm_algo_desc *xfrm_find_algo( + const struct xfrm_algo_list *algo_list, + int match(const struct xfrm_algo_desc *entry, const void *data), + const void *data, int probe) +{ + struct xfrm_algo_desc *list = algo_list->algs; + int i, status; + + for (i = 0; i < algo_list->entries; i++) { + if (!match(list + i, data)) + continue; + + if (list[i].available) + return &list[i]; + + if (!probe) + break; + + status = crypto_has_alg(list[i].name, algo_list->type, + algo_list->mask); + if (!status) + break; + + list[i].available = status; + return &list[i]; + } + return NULL; +} + +static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + return entry->desc.sadb_alg_id == (unsigned long)data; +} + +struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid); + +struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid); + +struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_calg_get_byid); + +static int xfrm_alg_name_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + const char *name = data; + + return name && (!strcmp(name, entry->name) || + (entry->compat && !strcmp(name, entry->compat))); +} + +struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname); + +struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname); + +struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe) +{ + return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_calg_get_byname); + +struct xfrm_aead_name { + const char *name; + int icvbits; +}; + +static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + const struct xfrm_aead_name *aead = data; + const char *name = aead->name; + + return aead->icvbits == entry->uinfo.aead.icv_truncbits && name && + !strcmp(name, entry->name); +} + +struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, int probe) +{ + struct xfrm_aead_name data = { + .name = name, + .icvbits = icv_len, + }; + + return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data, + probe); +} +EXPORT_SYMBOL_GPL(xfrm_aead_get_byname); + +struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx) +{ + if (idx >= aalg_entries()) + return NULL; + + return &aalg_list[idx]; +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx); + +struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx) +{ + if (idx >= ealg_entries()) + return NULL; + + return &ealg_list[idx]; +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx); + +/* + * Probe for the availability of crypto algorithms, and set the available + * flag for any algorithms found on the system. This is typically called by + * pfkey during userspace SA add, update or register. + */ +void xfrm_probe_algs(void) +{ + int i, status; + + BUG_ON(in_softirq()); + + for (i = 0; i < aalg_entries(); i++) { + status = crypto_has_ahash(aalg_list[i].name, 0, 0); + if (aalg_list[i].available != status) + aalg_list[i].available = status; + } + + for (i = 0; i < ealg_entries(); i++) { + status = crypto_has_skcipher(ealg_list[i].name, 0, 0); + if (ealg_list[i].available != status) + ealg_list[i].available = status; + } + + for (i = 0; i < calg_entries(); i++) { + status = crypto_has_comp(calg_list[i].name, 0, + CRYPTO_ALG_ASYNC); + if (calg_list[i].available != status) + calg_list[i].available = status; + } +} +EXPORT_SYMBOL_GPL(xfrm_probe_algs); + +int xfrm_count_pfkey_auth_supported(void) +{ + int i, n; + + for (i = 0, n = 0; i < aalg_entries(); i++) + if (aalg_list[i].available && aalg_list[i].pfkey_supported) + n++; + return n; +} +EXPORT_SYMBOL_GPL(xfrm_count_pfkey_auth_supported); + +int xfrm_count_pfkey_enc_supported(void) +{ + int i, n; + + for (i = 0, n = 0; i < ealg_entries(); i++) + if (ealg_list[i].available && ealg_list[i].pfkey_supported) + n++; + return n; +} +EXPORT_SYMBOL_GPL(xfrm_count_pfkey_enc_supported); + +MODULE_LICENSE("GPL"); diff --git a/net/xfrm/xfrm_compat.c b/net/xfrm/xfrm_compat.c new file mode 100644 index 000000000..655fe4ff8 --- /dev/null +++ b/net/xfrm/xfrm_compat.c @@ -0,0 +1,675 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * XFRM compat layer + * Author: Dmitry Safonov + * Based on code and translator idea by: Florian Westphal + */ +#include +#include +#include +#include + +struct compat_xfrm_lifetime_cfg { + compat_u64 soft_byte_limit, hard_byte_limit; + compat_u64 soft_packet_limit, hard_packet_limit; + compat_u64 soft_add_expires_seconds, hard_add_expires_seconds; + compat_u64 soft_use_expires_seconds, hard_use_expires_seconds; +}; /* same size on 32bit, but only 4 byte alignment required */ + +struct compat_xfrm_lifetime_cur { + compat_u64 bytes, packets, add_time, use_time; +}; /* same size on 32bit, but only 4 byte alignment required */ + +struct compat_xfrm_userpolicy_info { + struct xfrm_selector sel; + struct compat_xfrm_lifetime_cfg lft; + struct compat_xfrm_lifetime_cur curlft; + __u32 priority, index; + u8 dir, action, flags, share; + /* 4 bytes additional padding on 64bit */ +}; + +struct compat_xfrm_usersa_info { + struct xfrm_selector sel; + struct xfrm_id id; + xfrm_address_t saddr; + struct compat_xfrm_lifetime_cfg lft; + struct compat_xfrm_lifetime_cur curlft; + struct xfrm_stats stats; + __u32 seq, reqid; + u16 family; + u8 mode, replay_window, flags; + /* 4 bytes additional padding on 64bit */ +}; + +struct compat_xfrm_user_acquire { + struct xfrm_id id; + xfrm_address_t saddr; + struct xfrm_selector sel; + struct compat_xfrm_userpolicy_info policy; + /* 4 bytes additional padding on 64bit */ + __u32 aalgos, ealgos, calgos, seq; +}; + +struct compat_xfrm_userspi_info { + struct compat_xfrm_usersa_info info; + /* 4 bytes additional padding on 64bit */ + __u32 min, max; +}; + +struct compat_xfrm_user_expire { + struct compat_xfrm_usersa_info state; + /* 8 bytes additional padding on 64bit */ + u8 hard; +}; + +struct compat_xfrm_user_polexpire { + struct compat_xfrm_userpolicy_info pol; + /* 8 bytes additional padding on 64bit */ + u8 hard; +}; + +#define XMSGSIZE(type) sizeof(struct type) + +static const int compat_msg_min[XFRM_NR_MSGTYPES] = { + [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info), + [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info), + [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userspi_info), + [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_acquire), + [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_expire), + [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_userpolicy_info), + [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_usersa_info), + [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(compat_xfrm_user_polexpire), + [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, + [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), + [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_NEWSADINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_MAPPING - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_mapping) +}; + +static const struct nla_policy compat_policy[XFRMA_MAX+1] = { + [XFRMA_SA] = { .len = XMSGSIZE(compat_xfrm_usersa_info)}, + [XFRMA_POLICY] = { .len = XMSGSIZE(compat_xfrm_userpolicy_info)}, + [XFRMA_LASTUSED] = { .type = NLA_U64}, + [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, + [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, + [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, + [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, + [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) }, + [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, + [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, + [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, + [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, + [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, + [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, + [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, + [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, + [XFRMA_TFCPAD] = { .type = NLA_U32 }, + [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, + [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, + [XFRMA_PROTO] = { .type = NLA_U8 }, + [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, + [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, + [XFRMA_SET_MARK] = { .type = NLA_U32 }, + [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, + [XFRMA_IF_ID] = { .type = NLA_U32 }, + [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, +}; + +static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb, + const struct nlmsghdr *nlh_src, u16 type) +{ + int payload = compat_msg_min[type]; + int src_len = xfrm_msg_min[type]; + struct nlmsghdr *nlh_dst; + + /* Compat messages are shorter or equal to native (+padding) */ + if (WARN_ON_ONCE(src_len < payload)) + return ERR_PTR(-EMSGSIZE); + + nlh_dst = nlmsg_put(skb, nlh_src->nlmsg_pid, nlh_src->nlmsg_seq, + nlh_src->nlmsg_type, payload, nlh_src->nlmsg_flags); + if (!nlh_dst) + return ERR_PTR(-EMSGSIZE); + + memset(nlmsg_data(nlh_dst), 0, payload); + + switch (nlh_src->nlmsg_type) { + /* Compat message has the same layout as native */ + case XFRM_MSG_DELSA: + case XFRM_MSG_DELPOLICY: + case XFRM_MSG_FLUSHSA: + case XFRM_MSG_FLUSHPOLICY: + case XFRM_MSG_NEWAE: + case XFRM_MSG_REPORT: + case XFRM_MSG_MIGRATE: + case XFRM_MSG_NEWSADINFO: + case XFRM_MSG_NEWSPDINFO: + case XFRM_MSG_MAPPING: + WARN_ON_ONCE(src_len != payload); + memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), src_len); + break; + /* 4 byte alignment for trailing u64 on native, but not on compat */ + case XFRM_MSG_NEWSA: + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_UPDSA: + case XFRM_MSG_UPDPOLICY: + WARN_ON_ONCE(src_len != payload + 4); + memcpy(nlmsg_data(nlh_dst), nlmsg_data(nlh_src), payload); + break; + case XFRM_MSG_EXPIRE: { + const struct xfrm_user_expire *src_ue = nlmsg_data(nlh_src); + struct compat_xfrm_user_expire *dst_ue = nlmsg_data(nlh_dst); + + /* compat_xfrm_user_expire has 4-byte smaller state */ + memcpy(dst_ue, src_ue, sizeof(dst_ue->state)); + dst_ue->hard = src_ue->hard; + break; + } + case XFRM_MSG_ACQUIRE: { + const struct xfrm_user_acquire *src_ua = nlmsg_data(nlh_src); + struct compat_xfrm_user_acquire *dst_ua = nlmsg_data(nlh_dst); + + memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); + dst_ua->aalgos = src_ua->aalgos; + dst_ua->ealgos = src_ua->ealgos; + dst_ua->calgos = src_ua->calgos; + dst_ua->seq = src_ua->seq; + break; + } + case XFRM_MSG_POLEXPIRE: { + const struct xfrm_user_polexpire *src_upe = nlmsg_data(nlh_src); + struct compat_xfrm_user_polexpire *dst_upe = nlmsg_data(nlh_dst); + + /* compat_xfrm_user_polexpire has 4-byte smaller state */ + memcpy(dst_upe, src_upe, sizeof(dst_upe->pol)); + dst_upe->hard = src_upe->hard; + break; + } + case XFRM_MSG_ALLOCSPI: { + const struct xfrm_userspi_info *src_usi = nlmsg_data(nlh_src); + struct compat_xfrm_userspi_info *dst_usi = nlmsg_data(nlh_dst); + + /* compat_xfrm_user_polexpire has 4-byte smaller state */ + memcpy(dst_usi, src_usi, sizeof(src_usi->info)); + dst_usi->min = src_usi->min; + dst_usi->max = src_usi->max; + break; + } + /* Not being sent by kernel */ + case XFRM_MSG_GETSA: + case XFRM_MSG_GETPOLICY: + case XFRM_MSG_GETAE: + case XFRM_MSG_GETSADINFO: + case XFRM_MSG_GETSPDINFO: + default: + pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); + return ERR_PTR(-EOPNOTSUPP); + } + + return nlh_dst; +} + +static int xfrm_nla_cpy(struct sk_buff *dst, const struct nlattr *src, int len) +{ + return nla_put(dst, src->nla_type, len, nla_data(src)); +} + +static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src) +{ + switch (src->nla_type) { + case XFRMA_PAD: + /* Ignore */ + return 0; + case XFRMA_UNSPEC: + case XFRMA_ALG_AUTH: + case XFRMA_ALG_CRYPT: + case XFRMA_ALG_COMP: + case XFRMA_ENCAP: + case XFRMA_TMPL: + return xfrm_nla_cpy(dst, src, nla_len(src)); + case XFRMA_SA: + return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_usersa_info)); + case XFRMA_POLICY: + return xfrm_nla_cpy(dst, src, XMSGSIZE(compat_xfrm_userpolicy_info)); + case XFRMA_SEC_CTX: + return xfrm_nla_cpy(dst, src, nla_len(src)); + case XFRMA_LTIME_VAL: + return nla_put_64bit(dst, src->nla_type, nla_len(src), + nla_data(src), XFRMA_PAD); + case XFRMA_REPLAY_VAL: + case XFRMA_REPLAY_THRESH: + case XFRMA_ETIMER_THRESH: + case XFRMA_SRCADDR: + case XFRMA_COADDR: + return xfrm_nla_cpy(dst, src, nla_len(src)); + case XFRMA_LASTUSED: + return nla_put_64bit(dst, src->nla_type, nla_len(src), + nla_data(src), XFRMA_PAD); + case XFRMA_POLICY_TYPE: + case XFRMA_MIGRATE: + case XFRMA_ALG_AEAD: + case XFRMA_KMADDRESS: + case XFRMA_ALG_AUTH_TRUNC: + case XFRMA_MARK: + case XFRMA_TFCPAD: + case XFRMA_REPLAY_ESN_VAL: + case XFRMA_SA_EXTRA_FLAGS: + case XFRMA_PROTO: + case XFRMA_ADDRESS_FILTER: + case XFRMA_OFFLOAD_DEV: + case XFRMA_SET_MARK: + case XFRMA_SET_MARK_MASK: + case XFRMA_IF_ID: + case XFRMA_MTIMER_THRESH: + return xfrm_nla_cpy(dst, src, nla_len(src)); + default: + BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH); + pr_warn_once("unsupported nla_type %d\n", src->nla_type); + return -EOPNOTSUPP; + } +} + +/* Take kernel-built (64bit layout) and create 32bit layout for userspace */ +static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src) +{ + u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; + const struct nlattr *nla, *attrs; + struct nlmsghdr *nlh_dst; + int len, remaining; + + nlh_dst = xfrm_nlmsg_put_compat(dst, nlh_src, type); + if (IS_ERR(nlh_dst)) + return PTR_ERR(nlh_dst); + + attrs = nlmsg_attrdata(nlh_src, xfrm_msg_min[type]); + len = nlmsg_attrlen(nlh_src, xfrm_msg_min[type]); + + nla_for_each_attr(nla, attrs, len, remaining) { + int err; + + switch (nlh_src->nlmsg_type) { + case XFRM_MSG_NEWSPDINFO: + err = xfrm_nla_cpy(dst, nla, nla_len(nla)); + break; + default: + err = xfrm_xlate64_attr(dst, nla); + break; + } + if (err) + return err; + } + + nlmsg_end(dst, nlh_dst); + + return 0; +} + +static int xfrm_alloc_compat(struct sk_buff *skb, const struct nlmsghdr *nlh_src) +{ + u16 type = nlh_src->nlmsg_type - XFRM_MSG_BASE; + struct sk_buff *new = NULL; + int err; + + if (type >= ARRAY_SIZE(xfrm_msg_min)) { + pr_warn_once("unsupported nlmsg_type %d\n", nlh_src->nlmsg_type); + return -EOPNOTSUPP; + } + + if (skb_shinfo(skb)->frag_list == NULL) { + new = alloc_skb(skb->len + skb_tailroom(skb), GFP_ATOMIC); + if (!new) + return -ENOMEM; + skb_shinfo(skb)->frag_list = new; + } + + err = xfrm_xlate64(skb_shinfo(skb)->frag_list, nlh_src); + if (err) { + if (new) { + kfree_skb(new); + skb_shinfo(skb)->frag_list = NULL; + } + return err; + } + + return 0; +} + +/* Calculates len of translated 64-bit message. */ +static size_t xfrm_user_rcv_calculate_len64(const struct nlmsghdr *src, + struct nlattr *attrs[XFRMA_MAX + 1], + int maxtype) +{ + size_t len = nlmsg_len(src); + + switch (src->nlmsg_type) { + case XFRM_MSG_NEWSA: + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_ALLOCSPI: + case XFRM_MSG_ACQUIRE: + case XFRM_MSG_UPDPOLICY: + case XFRM_MSG_UPDSA: + len += 4; + break; + case XFRM_MSG_EXPIRE: + case XFRM_MSG_POLEXPIRE: + len += 8; + break; + case XFRM_MSG_NEWSPDINFO: + /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ + return len; + default: + break; + } + + /* Unexpected for anything, but XFRM_MSG_NEWSPDINFO, please + * correct both 64=>32-bit and 32=>64-bit translators to copy + * new attributes. + */ + if (WARN_ON_ONCE(maxtype)) + return len; + + if (attrs[XFRMA_SA]) + len += 4; + if (attrs[XFRMA_POLICY]) + len += 4; + + /* XXX: some attrs may need to be realigned + * if !CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS + */ + + return len; +} + +static int xfrm_attr_cpy32(void *dst, size_t *pos, const struct nlattr *src, + size_t size, int copy_len, int payload) +{ + struct nlmsghdr *nlmsg = dst; + struct nlattr *nla; + + /* xfrm_user_rcv_msg_compat() relies on fact that 32-bit messages + * have the same len or shorted than 64-bit ones. + * 32-bit translation that is bigger than 64-bit original is unexpected. + */ + if (WARN_ON_ONCE(copy_len > payload)) + copy_len = payload; + + if (size - *pos < nla_attr_size(payload)) + return -ENOBUFS; + + nla = dst + *pos; + + memcpy(nla, src, nla_attr_size(copy_len)); + nla->nla_len = nla_attr_size(payload); + *pos += nla_attr_size(copy_len); + nlmsg->nlmsg_len += nla->nla_len; + + memset(dst + *pos, 0, payload - copy_len); + *pos += payload - copy_len; + + return 0; +} + +static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla, + size_t *pos, size_t size, + struct netlink_ext_ack *extack) +{ + int type = nla_type(nla); + u16 pol_len32, pol_len64; + int err; + + if (type > XFRMA_MAX) { + BUILD_BUG_ON(XFRMA_MAX != XFRMA_MTIMER_THRESH); + NL_SET_ERR_MSG(extack, "Bad attribute"); + return -EOPNOTSUPP; + } + type = array_index_nospec(type, XFRMA_MAX + 1); + if (nla_len(nla) < compat_policy[type].len) { + NL_SET_ERR_MSG(extack, "Attribute bad length"); + return -EOPNOTSUPP; + } + + pol_len32 = compat_policy[type].len; + pol_len64 = xfrma_policy[type].len; + + /* XFRMA_SA and XFRMA_POLICY - need to know how-to translate */ + if (pol_len32 != pol_len64) { + if (nla_len(nla) != compat_policy[type].len) { + NL_SET_ERR_MSG(extack, "Attribute bad length"); + return -EOPNOTSUPP; + } + err = xfrm_attr_cpy32(dst, pos, nla, size, pol_len32, pol_len64); + if (err) + return err; + } + + return xfrm_attr_cpy32(dst, pos, nla, size, nla_len(nla), nla_len(nla)); +} + +static int xfrm_xlate32(struct nlmsghdr *dst, const struct nlmsghdr *src, + struct nlattr *attrs[XFRMA_MAX+1], + size_t size, u8 type, int maxtype, + struct netlink_ext_ack *extack) +{ + size_t pos; + int i; + + memcpy(dst, src, NLMSG_HDRLEN); + dst->nlmsg_len = NLMSG_HDRLEN + xfrm_msg_min[type]; + memset(nlmsg_data(dst), 0, xfrm_msg_min[type]); + + switch (src->nlmsg_type) { + /* Compat message has the same layout as native */ + case XFRM_MSG_DELSA: + case XFRM_MSG_GETSA: + case XFRM_MSG_DELPOLICY: + case XFRM_MSG_GETPOLICY: + case XFRM_MSG_FLUSHSA: + case XFRM_MSG_FLUSHPOLICY: + case XFRM_MSG_NEWAE: + case XFRM_MSG_GETAE: + case XFRM_MSG_REPORT: + case XFRM_MSG_MIGRATE: + case XFRM_MSG_NEWSADINFO: + case XFRM_MSG_GETSADINFO: + case XFRM_MSG_NEWSPDINFO: + case XFRM_MSG_GETSPDINFO: + case XFRM_MSG_MAPPING: + memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); + break; + /* 4 byte alignment for trailing u64 on native, but not on compat */ + case XFRM_MSG_NEWSA: + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_UPDSA: + case XFRM_MSG_UPDPOLICY: + memcpy(nlmsg_data(dst), nlmsg_data(src), compat_msg_min[type]); + break; + case XFRM_MSG_EXPIRE: { + const struct compat_xfrm_user_expire *src_ue = nlmsg_data(src); + struct xfrm_user_expire *dst_ue = nlmsg_data(dst); + + /* compat_xfrm_user_expire has 4-byte smaller state */ + memcpy(dst_ue, src_ue, sizeof(src_ue->state)); + dst_ue->hard = src_ue->hard; + break; + } + case XFRM_MSG_ACQUIRE: { + const struct compat_xfrm_user_acquire *src_ua = nlmsg_data(src); + struct xfrm_user_acquire *dst_ua = nlmsg_data(dst); + + memcpy(dst_ua, src_ua, offsetof(struct compat_xfrm_user_acquire, aalgos)); + dst_ua->aalgos = src_ua->aalgos; + dst_ua->ealgos = src_ua->ealgos; + dst_ua->calgos = src_ua->calgos; + dst_ua->seq = src_ua->seq; + break; + } + case XFRM_MSG_POLEXPIRE: { + const struct compat_xfrm_user_polexpire *src_upe = nlmsg_data(src); + struct xfrm_user_polexpire *dst_upe = nlmsg_data(dst); + + /* compat_xfrm_user_polexpire has 4-byte smaller state */ + memcpy(dst_upe, src_upe, sizeof(src_upe->pol)); + dst_upe->hard = src_upe->hard; + break; + } + case XFRM_MSG_ALLOCSPI: { + const struct compat_xfrm_userspi_info *src_usi = nlmsg_data(src); + struct xfrm_userspi_info *dst_usi = nlmsg_data(dst); + + /* compat_xfrm_user_polexpire has 4-byte smaller state */ + memcpy(dst_usi, src_usi, sizeof(src_usi->info)); + dst_usi->min = src_usi->min; + dst_usi->max = src_usi->max; + break; + } + default: + NL_SET_ERR_MSG(extack, "Unsupported message type"); + return -EOPNOTSUPP; + } + pos = dst->nlmsg_len; + + if (maxtype) { + /* attirbutes are xfrm_spdattr_type_t, not xfrm_attr_type_t */ + WARN_ON_ONCE(src->nlmsg_type != XFRM_MSG_NEWSPDINFO); + + for (i = 1; i <= maxtype; i++) { + int err; + + if (!attrs[i]) + continue; + + /* just copy - no need for translation */ + err = xfrm_attr_cpy32(dst, &pos, attrs[i], size, + nla_len(attrs[i]), nla_len(attrs[i])); + if (err) + return err; + } + return 0; + } + + for (i = 1; i < XFRMA_MAX + 1; i++) { + int err; + + if (i == XFRMA_PAD) + continue; + + if (!attrs[i]) + continue; + + err = xfrm_xlate32_attr(dst, attrs[i], &pos, size, extack); + if (err) + return err; + } + + return 0; +} + +static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32, + int maxtype, const struct nla_policy *policy, + struct netlink_ext_ack *extack) +{ + /* netlink_rcv_skb() checks if a message has full (struct nlmsghdr) */ + u16 type = h32->nlmsg_type - XFRM_MSG_BASE; + struct nlattr *attrs[XFRMA_MAX+1]; + struct nlmsghdr *h64; + size_t len; + int err; + + BUILD_BUG_ON(ARRAY_SIZE(xfrm_msg_min) != ARRAY_SIZE(compat_msg_min)); + + if (type >= ARRAY_SIZE(xfrm_msg_min)) + return ERR_PTR(-EINVAL); + + /* Don't call parse: the message might have only nlmsg header */ + if ((h32->nlmsg_type == XFRM_MSG_GETSA || + h32->nlmsg_type == XFRM_MSG_GETPOLICY) && + (h32->nlmsg_flags & NLM_F_DUMP)) + return NULL; + + err = nlmsg_parse_deprecated(h32, compat_msg_min[type], attrs, + maxtype ? : XFRMA_MAX, policy ? : compat_policy, extack); + if (err < 0) + return ERR_PTR(err); + + len = xfrm_user_rcv_calculate_len64(h32, attrs, maxtype); + /* The message doesn't need translation */ + if (len == nlmsg_len(h32)) + return NULL; + + len += NLMSG_HDRLEN; + h64 = kvmalloc(len, GFP_KERNEL); + if (!h64) + return ERR_PTR(-ENOMEM); + + err = xfrm_xlate32(h64, h32, attrs, len, type, maxtype, extack); + if (err < 0) { + kvfree(h64); + return ERR_PTR(err); + } + + return h64; +} + +static int xfrm_user_policy_compat(u8 **pdata32, int optlen) +{ + struct compat_xfrm_userpolicy_info *p = (void *)*pdata32; + u8 *src_templates, *dst_templates; + u8 *data64; + + if (optlen < sizeof(*p)) + return -EINVAL; + + data64 = kmalloc_track_caller(optlen + 4, GFP_USER | __GFP_NOWARN); + if (!data64) + return -ENOMEM; + + memcpy(data64, *pdata32, sizeof(*p)); + memset(data64 + sizeof(*p), 0, 4); + + src_templates = *pdata32 + sizeof(*p); + dst_templates = data64 + sizeof(*p) + 4; + memcpy(dst_templates, src_templates, optlen - sizeof(*p)); + + kfree(*pdata32); + *pdata32 = data64; + return 0; +} + +static struct xfrm_translator xfrm_translator = { + .owner = THIS_MODULE, + .alloc_compat = xfrm_alloc_compat, + .rcv_msg_compat = xfrm_user_rcv_msg_compat, + .xlate_user_policy_sockptr = xfrm_user_policy_compat, +}; + +static int __init xfrm_compat_init(void) +{ + return xfrm_register_translator(&xfrm_translator); +} + +static void __exit xfrm_compat_exit(void) +{ + xfrm_unregister_translator(&xfrm_translator); +} + +module_init(xfrm_compat_init); +module_exit(xfrm_compat_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Dmitry Safonov"); +MODULE_DESCRIPTION("XFRM 32-bit compatibility layer"); diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c new file mode 100644 index 000000000..21269e8f2 --- /dev/null +++ b/net/xfrm/xfrm_device.c @@ -0,0 +1,444 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * xfrm_device.c - IPsec device offloading code. + * + * Copyright (c) 2015 secunet Security Networks AG + * + * Author: + * Steffen Klassert + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_XFRM_OFFLOAD +static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb, + unsigned int hsize) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + + skb_reset_mac_len(skb); + if (xo->flags & XFRM_GSO_SEGMENT) + skb->transport_header -= x->props.header_len; + + pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len); +} + +static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb, + unsigned int hsize) + +{ + struct xfrm_offload *xo = xfrm_offload(skb); + + if (xo->flags & XFRM_GSO_SEGMENT) + skb->transport_header = skb->network_header + hsize; + + skb_reset_mac_len(skb); + pskb_pull(skb, skb->mac_len + x->props.header_len); +} + +static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb, + unsigned int hsize) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + int phlen = 0; + + if (xo->flags & XFRM_GSO_SEGMENT) + skb->transport_header = skb->network_header + hsize; + + skb_reset_mac_len(skb); + if (x->sel.family != AF_INET6) { + phlen = IPV4_BEET_PHMAXLEN; + if (x->outer_mode.family == AF_INET6) + phlen += sizeof(struct ipv6hdr) - sizeof(struct iphdr); + } + + pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen)); +} + +/* Adjust pointers into the packet when IPsec is done at layer2 */ +static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) +{ + switch (x->outer_mode.encap) { + case XFRM_MODE_TUNNEL: + if (x->outer_mode.family == AF_INET) + return __xfrm_mode_tunnel_prep(x, skb, + sizeof(struct iphdr)); + if (x->outer_mode.family == AF_INET6) + return __xfrm_mode_tunnel_prep(x, skb, + sizeof(struct ipv6hdr)); + break; + case XFRM_MODE_TRANSPORT: + if (x->outer_mode.family == AF_INET) + return __xfrm_transport_prep(x, skb, + sizeof(struct iphdr)); + if (x->outer_mode.family == AF_INET6) + return __xfrm_transport_prep(x, skb, + sizeof(struct ipv6hdr)); + break; + case XFRM_MODE_BEET: + if (x->outer_mode.family == AF_INET) + return __xfrm_mode_beet_prep(x, skb, + sizeof(struct iphdr)); + if (x->outer_mode.family == AF_INET6) + return __xfrm_mode_beet_prep(x, skb, + sizeof(struct ipv6hdr)); + break; + case XFRM_MODE_ROUTEOPTIMIZATION: + case XFRM_MODE_IN_TRIGGER: + break; + } +} + +static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + __u32 seq = xo->seq.low; + + seq += skb_shinfo(skb)->gso_segs; + if (unlikely(seq < xo->seq.low)) + return true; + + return false; +} + +struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) +{ + int err; + unsigned long flags; + struct xfrm_state *x; + struct softnet_data *sd; + struct sk_buff *skb2, *nskb, *pskb = NULL; + netdev_features_t esp_features = features; + struct xfrm_offload *xo = xfrm_offload(skb); + struct net_device *dev = skb->dev; + struct sec_path *sp; + + if (!xo || (xo->flags & XFRM_XMIT)) + return skb; + + if (!(features & NETIF_F_HW_ESP)) + esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK); + + sp = skb_sec_path(skb); + x = sp->xvec[sp->len - 1]; + if (xo->flags & XFRM_GRO || x->xso.dir == XFRM_DEV_OFFLOAD_IN) + return skb; + + /* This skb was already validated on the upper/virtual dev */ + if ((x->xso.dev != dev) && (x->xso.real_dev == dev)) + return skb; + + local_irq_save(flags); + sd = this_cpu_ptr(&softnet_data); + err = !skb_queue_empty(&sd->xfrm_backlog); + local_irq_restore(flags); + + if (err) { + *again = true; + return skb; + } + + if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) || + unlikely(xmit_xfrm_check_overflow(skb)))) { + struct sk_buff *segs; + + /* Packet got rerouted, fixup features and segment it. */ + esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP); + + segs = skb_gso_segment(skb, esp_features); + if (IS_ERR(segs)) { + kfree_skb(skb); + dev_core_stats_tx_dropped_inc(dev); + return NULL; + } else { + consume_skb(skb); + skb = segs; + } + } + + if (!skb->next) { + esp_features |= skb->dev->gso_partial_features; + xfrm_outer_mode_prep(x, skb); + + xo->flags |= XFRM_DEV_RESUME; + + err = x->type_offload->xmit(x, skb, esp_features); + if (err) { + if (err == -EINPROGRESS) + return NULL; + + XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); + kfree_skb(skb); + return NULL; + } + + skb_push(skb, skb->data - skb_mac_header(skb)); + + return skb; + } + + skb_list_walk_safe(skb, skb2, nskb) { + esp_features |= skb->dev->gso_partial_features; + skb_mark_not_on_list(skb2); + + xo = xfrm_offload(skb2); + xo->flags |= XFRM_DEV_RESUME; + + xfrm_outer_mode_prep(x, skb2); + + err = x->type_offload->xmit(x, skb2, esp_features); + if (!err) { + skb2->next = nskb; + } else if (err != -EINPROGRESS) { + XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR); + skb2->next = nskb; + kfree_skb_list(skb2); + return NULL; + } else { + if (skb == skb2) + skb = nskb; + else + pskb->next = nskb; + + continue; + } + + skb_push(skb2, skb2->data - skb_mac_header(skb2)); + pskb = skb2; + } + + return skb; +} +EXPORT_SYMBOL_GPL(validate_xmit_xfrm); + +int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, + struct xfrm_user_offload *xuo, + struct netlink_ext_ack *extack) +{ + int err; + struct dst_entry *dst; + struct net_device *dev; + struct xfrm_dev_offload *xso = &x->xso; + xfrm_address_t *saddr; + xfrm_address_t *daddr; + + if (!x->type_offload) { + NL_SET_ERR_MSG(extack, "Type doesn't support offload"); + return -EINVAL; + } + + /* We don't yet support UDP encapsulation and TFC padding. */ + if (x->encap || x->tfcpad) { + NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded"); + return -EINVAL; + } + + if (xuo->flags & ~(XFRM_OFFLOAD_IPV6 | XFRM_OFFLOAD_INBOUND)) { + NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request"); + return -EINVAL; + } + + dev = dev_get_by_index(net, xuo->ifindex); + if (!dev) { + if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { + saddr = &x->props.saddr; + daddr = &x->id.daddr; + } else { + saddr = &x->id.daddr; + daddr = &x->props.saddr; + } + + dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, + x->props.family, + xfrm_smark_get(0, x)); + if (IS_ERR(dst)) + return 0; + + dev = dst->dev; + + dev_hold(dev); + dst_release(dst); + } + + if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { + xso->dev = NULL; + dev_put(dev); + return 0; + } + + if (x->props.flags & XFRM_STATE_ESN && + !dev->xfrmdev_ops->xdo_dev_state_advance_esn) { + NL_SET_ERR_MSG(extack, "Device doesn't support offload with ESN"); + xso->dev = NULL; + dev_put(dev); + return -EINVAL; + } + + xso->dev = dev; + netdev_tracker_alloc(dev, &xso->dev_tracker, GFP_ATOMIC); + xso->real_dev = dev; + + if (xuo->flags & XFRM_OFFLOAD_INBOUND) + xso->dir = XFRM_DEV_OFFLOAD_IN; + else + xso->dir = XFRM_DEV_OFFLOAD_OUT; + + err = dev->xfrmdev_ops->xdo_dev_state_add(x); + if (err) { + xso->dev = NULL; + xso->dir = 0; + xso->real_dev = NULL; + netdev_put(dev, &xso->dev_tracker); + + if (err != -EOPNOTSUPP) { + NL_SET_ERR_MSG(extack, "Device failed to offload this state"); + return err; + } + } + + return 0; +} +EXPORT_SYMBOL_GPL(xfrm_dev_state_add); + +bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) +{ + int mtu; + struct dst_entry *dst = skb_dst(skb); + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + struct net_device *dev = x->xso.dev; + + if (!x->type_offload || x->encap) + return false; + + if ((!dev || (dev == xfrm_dst_path(dst)->dev)) && + (!xdst->child->xfrm)) { + mtu = xfrm_state_mtu(x, xdst->child_mtu_cached); + if (skb->len <= mtu) + goto ok; + + if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) + goto ok; + } + + return false; + +ok: + if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) + return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); + + return true; +} +EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); + +void xfrm_dev_resume(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + int ret = NETDEV_TX_BUSY; + struct netdev_queue *txq; + struct softnet_data *sd; + unsigned long flags; + + rcu_read_lock(); + txq = netdev_core_pick_tx(dev, skb, NULL); + + HARD_TX_LOCK(dev, txq, smp_processor_id()); + if (!netif_xmit_frozen_or_stopped(txq)) + skb = dev_hard_start_xmit(skb, dev, txq, &ret); + HARD_TX_UNLOCK(dev, txq); + + if (!dev_xmit_complete(ret)) { + local_irq_save(flags); + sd = this_cpu_ptr(&softnet_data); + skb_queue_tail(&sd->xfrm_backlog, skb); + raise_softirq_irqoff(NET_TX_SOFTIRQ); + local_irq_restore(flags); + } + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(xfrm_dev_resume); + +void xfrm_dev_backlog(struct softnet_data *sd) +{ + struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog; + struct sk_buff_head list; + struct sk_buff *skb; + + if (skb_queue_empty(xfrm_backlog)) + return; + + __skb_queue_head_init(&list); + + spin_lock(&xfrm_backlog->lock); + skb_queue_splice_init(xfrm_backlog, &list); + spin_unlock(&xfrm_backlog->lock); + + while (!skb_queue_empty(&list)) { + skb = __skb_dequeue(&list); + xfrm_dev_resume(skb); + } + +} +#endif + +static int xfrm_api_check(struct net_device *dev) +{ +#ifdef CONFIG_XFRM_OFFLOAD + if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && + !(dev->features & NETIF_F_HW_ESP)) + return NOTIFY_BAD; + + if ((dev->features & NETIF_F_HW_ESP) && + (!(dev->xfrmdev_ops && + dev->xfrmdev_ops->xdo_dev_state_add && + dev->xfrmdev_ops->xdo_dev_state_delete))) + return NOTIFY_BAD; +#else + if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM)) + return NOTIFY_BAD; +#endif + + return NOTIFY_DONE; +} + +static int xfrm_dev_down(struct net_device *dev) +{ + if (dev->features & NETIF_F_HW_ESP) + xfrm_dev_state_flush(dev_net(dev), dev, true); + + return NOTIFY_DONE; +} + +static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + switch (event) { + case NETDEV_REGISTER: + return xfrm_api_check(dev); + + case NETDEV_FEAT_CHANGE: + return xfrm_api_check(dev); + + case NETDEV_DOWN: + case NETDEV_UNREGISTER: + return xfrm_dev_down(dev); + } + return NOTIFY_DONE; +} + +static struct notifier_block xfrm_dev_notifier = { + .notifier_call = xfrm_dev_event, +}; + +void __init xfrm_dev_init(void) +{ + register_netdevice_notifier(&xfrm_dev_notifier); +} diff --git a/net/xfrm/xfrm_hash.c b/net/xfrm/xfrm_hash.c new file mode 100644 index 000000000..eca8d84d9 --- /dev/null +++ b/net/xfrm/xfrm_hash.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0 +/* xfrm_hash.c: Common hash table code. + * + * Copyright (C) 2006 David S. Miller (davem@davemloft.net) + */ + +#include +#include +#include +#include +#include +#include + +#include "xfrm_hash.h" + +struct hlist_head *xfrm_hash_alloc(unsigned int sz) +{ + struct hlist_head *n; + + if (sz <= PAGE_SIZE) + n = kzalloc(sz, GFP_KERNEL); + else if (hashdist) + n = vzalloc(sz); + else + n = (struct hlist_head *) + __get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, + get_order(sz)); + + return n; +} + +void xfrm_hash_free(struct hlist_head *n, unsigned int sz) +{ + if (sz <= PAGE_SIZE) + kfree(n); + else if (hashdist) + vfree(n); + else + free_pages((unsigned long)n, get_order(sz)); +} diff --git a/net/xfrm/xfrm_hash.h b/net/xfrm/xfrm_hash.h new file mode 100644 index 000000000..d12bb906c --- /dev/null +++ b/net/xfrm/xfrm_hash.h @@ -0,0 +1,199 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _XFRM_HASH_H +#define _XFRM_HASH_H + +#include +#include +#include + +static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr) +{ + return ntohl(addr->a4); +} + +static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr) +{ + return jhash2((__force u32 *)addr->a6, 4, 0); +} + +static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr) +{ + u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4; + return ntohl((__force __be32)sum); +} + +static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr) +{ + return __xfrm6_addr_hash(daddr) ^ __xfrm6_addr_hash(saddr); +} + +static inline u32 __bits2mask32(__u8 bits) +{ + u32 mask32 = 0xffffffff; + + if (bits == 0) + mask32 = 0; + else if (bits < 32) + mask32 <<= (32 - bits); + + return mask32; +} + +static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + __u8 dbits, + __u8 sbits) +{ + return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits), + ntohl(saddr->a4) & __bits2mask32(sbits), + 0); +} + +static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr, + __u8 prefixlen) +{ + unsigned int pdw; + unsigned int pbi; + u32 initval = 0; + + pdw = prefixlen >> 5; /* num of whole u32 in prefix */ + pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */ + + if (pbi) { + __be32 mask; + + mask = htonl((0xffffffff) << (32 - pbi)); + + initval = (__force u32)(addr->a6[pdw] & mask); + } + + return jhash2((__force u32 *)addr->a6, pdw, initval); +} + +static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + __u8 dbits, + __u8 sbits) +{ + return __xfrm6_pref_hash(daddr, dbits) ^ + __xfrm6_pref_hash(saddr, sbits); +} + +static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u32 reqid, unsigned short family, + unsigned int hmask) +{ + unsigned int h = family ^ reqid; + switch (family) { + case AF_INET: + h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); + break; + case AF_INET6: + h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); + break; + } + return (h ^ (h >> 16)) & hmask; +} + +static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, + unsigned int hmask) +{ + unsigned int h = family; + switch (family) { + case AF_INET: + h ^= __xfrm4_daddr_saddr_hash(daddr, saddr); + break; + case AF_INET6: + h ^= __xfrm6_daddr_saddr_hash(daddr, saddr); + break; + } + return (h ^ (h >> 16)) & hmask; +} + +static inline unsigned int +__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto, + unsigned short family, unsigned int hmask) +{ + unsigned int h = (__force u32)spi ^ proto; + switch (family) { + case AF_INET: + h ^= __xfrm4_addr_hash(daddr); + break; + case AF_INET6: + h ^= __xfrm6_addr_hash(daddr); + break; + } + return (h ^ (h >> 10) ^ (h >> 20)) & hmask; +} + +static inline unsigned int +__xfrm_seq_hash(u32 seq, unsigned int hmask) +{ + unsigned int h = seq; + return (h ^ (h >> 10) ^ (h >> 20)) & hmask; +} + +static inline unsigned int __idx_hash(u32 index, unsigned int hmask) +{ + return (index ^ (index >> 8)) & hmask; +} + +static inline unsigned int __sel_hash(const struct xfrm_selector *sel, + unsigned short family, unsigned int hmask, + u8 dbits, u8 sbits) +{ + const xfrm_address_t *daddr = &sel->daddr; + const xfrm_address_t *saddr = &sel->saddr; + unsigned int h = 0; + + switch (family) { + case AF_INET: + if (sel->prefixlen_d < dbits || + sel->prefixlen_s < sbits) + return hmask + 1; + + h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + + case AF_INET6: + if (sel->prefixlen_d < dbits || + sel->prefixlen_s < sbits) + return hmask + 1; + + h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + } + h ^= (h >> 16); + return h & hmask; +} + +static inline unsigned int __addr_hash(const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, + unsigned int hmask, + u8 dbits, u8 sbits) +{ + unsigned int h = 0; + + switch (family) { + case AF_INET: + h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + + case AF_INET6: + h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits); + break; + } + h ^= (h >> 16); + return h & hmask; +} + +struct hlist_head *xfrm_hash_alloc(unsigned int sz); +void xfrm_hash_free(struct hlist_head *n, unsigned int sz); + +#endif /* _XFRM_HASH_H */ diff --git a/net/xfrm/xfrm_inout.h b/net/xfrm/xfrm_inout.h new file mode 100644 index 000000000..efc5e6b2e --- /dev/null +++ b/net/xfrm/xfrm_inout.h @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include +#include +#include + +#ifndef XFRM_INOUT_H +#define XFRM_INOUT_H 1 + +static inline void xfrm4_extract_header(struct sk_buff *skb) +{ + const struct iphdr *iph = ip_hdr(skb); + + XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); + XFRM_MODE_SKB_CB(skb)->id = iph->id; + XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off; + XFRM_MODE_SKB_CB(skb)->tos = iph->tos; + XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl; + XFRM_MODE_SKB_CB(skb)->optlen = iph->ihl * 4 - sizeof(*iph); + memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0, + sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); +} + +static inline void xfrm6_extract_header(struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + struct ipv6hdr *iph = ipv6_hdr(skb); + + XFRM_MODE_SKB_CB(skb)->ihl = sizeof(*iph); + XFRM_MODE_SKB_CB(skb)->id = 0; + XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF); + XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph); + XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit; + XFRM_MODE_SKB_CB(skb)->optlen = 0; + memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl, + sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl)); +#else + WARN_ON_ONCE(1); +#endif +} + +static inline void xfrm6_beet_make_header(struct sk_buff *skb) +{ + struct ipv6hdr *iph = ipv6_hdr(skb); + + iph->version = 6; + + memcpy(iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl, + sizeof(iph->flow_lbl)); + iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol; + + ipv6_change_dsfield(iph, 0, XFRM_MODE_SKB_CB(skb)->tos); + iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl; +} + +static inline void xfrm4_beet_make_header(struct sk_buff *skb) +{ + struct iphdr *iph = ip_hdr(skb); + + iph->ihl = 5; + iph->version = 4; + + iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol; + iph->tos = XFRM_MODE_SKB_CB(skb)->tos; + + iph->id = XFRM_MODE_SKB_CB(skb)->id; + iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off; + iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl; +} + +#endif diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c new file mode 100644 index 000000000..ac1a645af --- /dev/null +++ b/net/xfrm/xfrm_input.c @@ -0,0 +1,834 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xfrm_input.c + * + * Changes: + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific portion + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xfrm_inout.h" + +struct xfrm_trans_tasklet { + struct work_struct work; + spinlock_t queue_lock; + struct sk_buff_head queue; +}; + +struct xfrm_trans_cb { + union { + struct inet_skb_parm h4; +#if IS_ENABLED(CONFIG_IPV6) + struct inet6_skb_parm h6; +#endif + } header; + int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); + struct net *net; +}; + +#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) + +static DEFINE_SPINLOCK(xfrm_input_afinfo_lock); +static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][AF_INET6 + 1]; + +static struct gro_cells gro_cells; +static struct net_device xfrm_napi_dev; + +static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet); + +int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo) +{ + int err = 0; + + if (WARN_ON(afinfo->family > AF_INET6)) + return -EAFNOSUPPORT; + + spin_lock_bh(&xfrm_input_afinfo_lock); + if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) + err = -EEXIST; + else + rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], afinfo); + spin_unlock_bh(&xfrm_input_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_input_register_afinfo); + +int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo) +{ + int err = 0; + + spin_lock_bh(&xfrm_input_afinfo_lock); + if (likely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family])) { + if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family] != afinfo)) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->is_ipip][afinfo->family], NULL); + } + spin_unlock_bh(&xfrm_input_afinfo_lock); + synchronize_rcu(); + return err; +} +EXPORT_SYMBOL(xfrm_input_unregister_afinfo); + +static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(u8 family, bool is_ipip) +{ + const struct xfrm_input_afinfo *afinfo; + + if (WARN_ON_ONCE(family > AF_INET6)) + return NULL; + + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol, + int err) +{ + bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6); + const struct xfrm_input_afinfo *afinfo; + int ret; + + afinfo = xfrm_input_get_afinfo(family, is_ipip); + if (!afinfo) + return -EAFNOSUPPORT; + + ret = afinfo->callback(skb, protocol, err); + rcu_read_unlock(); + + return ret; +} + +struct sec_path *secpath_set(struct sk_buff *skb) +{ + struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH); + + sp = skb_ext_add(skb, SKB_EXT_SEC_PATH); + if (!sp) + return NULL; + + if (tmp) /* reused existing one (was COW'd if needed) */ + return sp; + + /* allocated new secpath */ + memset(sp->ovec, 0, sizeof(sp->ovec)); + sp->olen = 0; + sp->len = 0; + sp->verified_cnt = 0; + + return sp; +} +EXPORT_SYMBOL(secpath_set); + +/* Fetch spi and seq from ipsec header */ + +int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) +{ + int offset, offset_seq; + int hlen; + + switch (nexthdr) { + case IPPROTO_AH: + hlen = sizeof(struct ip_auth_hdr); + offset = offsetof(struct ip_auth_hdr, spi); + offset_seq = offsetof(struct ip_auth_hdr, seq_no); + break; + case IPPROTO_ESP: + hlen = sizeof(struct ip_esp_hdr); + offset = offsetof(struct ip_esp_hdr, spi); + offset_seq = offsetof(struct ip_esp_hdr, seq_no); + break; + case IPPROTO_COMP: + if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) + return -EINVAL; + *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2))); + *seq = 0; + return 0; + default: + return 1; + } + + if (!pskb_may_pull(skb, hlen)) + return -EINVAL; + + *spi = *(__be32 *)(skb_transport_header(skb) + offset); + *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq); + return 0; +} +EXPORT_SYMBOL(xfrm_parse_spi); + +static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + struct iphdr *iph; + int optlen = 0; + int err = -EINVAL; + + if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) { + struct ip_beet_phdr *ph; + int phlen; + + if (!pskb_may_pull(skb, sizeof(*ph))) + goto out; + + ph = (struct ip_beet_phdr *)skb->data; + + phlen = sizeof(*ph) + ph->padlen; + optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen); + if (optlen < 0 || optlen & 3 || optlen > 250) + goto out; + + XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr; + + if (!pskb_may_pull(skb, phlen)) + goto out; + __skb_pull(skb, phlen); + } + + skb_push(skb, sizeof(*iph)); + skb_reset_network_header(skb); + skb_mac_header_rebuild(skb); + + xfrm4_beet_make_header(skb); + + iph = ip_hdr(skb); + + iph->ihl += optlen / 4; + iph->tot_len = htons(skb->len); + iph->daddr = x->sel.daddr.a4; + iph->saddr = x->sel.saddr.a4; + iph->check = 0; + iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); + err = 0; +out: + return err; +} + +static void ipip_ecn_decapsulate(struct sk_buff *skb) +{ + struct iphdr *inner_iph = ipip_hdr(skb); + + if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) + IP_ECN_set_ce(inner_iph); +} + +static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = -EINVAL; + + if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) + goto out; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto out; + + err = skb_unclone(skb, GFP_ATOMIC); + if (err) + goto out; + + if (x->props.flags & XFRM_STATE_DECAP_DSCP) + ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb)); + if (!(x->props.flags & XFRM_STATE_NOECN)) + ipip_ecn_decapsulate(skb); + + skb_reset_network_header(skb); + skb_mac_header_rebuild(skb); + if (skb->mac_len) + eth_hdr(skb)->h_proto = skb->protocol; + + err = 0; + +out: + return err; +} + +static void ipip6_ecn_decapsulate(struct sk_buff *skb) +{ + struct ipv6hdr *inner_iph = ipipv6_hdr(skb); + + if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos)) + IP6_ECN_set_ce(skb, inner_iph); +} + +static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = -EINVAL; + + if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6) + goto out; + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) + goto out; + + err = skb_unclone(skb, GFP_ATOMIC); + if (err) + goto out; + + if (x->props.flags & XFRM_STATE_DECAP_DSCP) + ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb)); + if (!(x->props.flags & XFRM_STATE_NOECN)) + ipip6_ecn_decapsulate(skb); + + skb_reset_network_header(skb); + skb_mac_header_rebuild(skb); + if (skb->mac_len) + eth_hdr(skb)->h_proto = skb->protocol; + + err = 0; + +out: + return err; +} + +static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipv6hdr *ip6h; + int size = sizeof(struct ipv6hdr); + int err; + + err = skb_cow_head(skb, size + skb->mac_len); + if (err) + goto out; + + __skb_push(skb, size); + skb_reset_network_header(skb); + skb_mac_header_rebuild(skb); + + xfrm6_beet_make_header(skb); + + ip6h = ipv6_hdr(skb); + ip6h->payload_len = htons(skb->len - size); + ip6h->daddr = x->sel.daddr.in6; + ip6h->saddr = x->sel.saddr.in6; + err = 0; +out: + return err; +} + +/* Remove encapsulation header. + * + * The IP header will be moved over the top of the encapsulation + * header. + * + * On entry, the transport header shall point to where the IP header + * should be and the network header shall be set to where the IP + * header currently is. skb->data shall point to the start of the + * payload. + */ +static int +xfrm_inner_mode_encap_remove(struct xfrm_state *x, + const struct xfrm_mode *inner_mode, + struct sk_buff *skb) +{ + switch (inner_mode->encap) { + case XFRM_MODE_BEET: + if (inner_mode->family == AF_INET) + return xfrm4_remove_beet_encap(x, skb); + if (inner_mode->family == AF_INET6) + return xfrm6_remove_beet_encap(x, skb); + break; + case XFRM_MODE_TUNNEL: + if (inner_mode->family == AF_INET) + return xfrm4_remove_tunnel_encap(x, skb); + if (inner_mode->family == AF_INET6) + return xfrm6_remove_tunnel_encap(x, skb); + break; + } + + WARN_ON_ONCE(1); + return -EOPNOTSUPP; +} + +static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) +{ + const struct xfrm_mode *inner_mode = &x->inner_mode; + + switch (x->outer_mode.family) { + case AF_INET: + xfrm4_extract_header(skb); + break; + case AF_INET6: + xfrm6_extract_header(skb); + break; + default: + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; + } + + if (x->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); + if (!inner_mode) + return -EAFNOSUPPORT; + } + + switch (inner_mode->family) { + case AF_INET: + skb->protocol = htons(ETH_P_IP); + break; + case AF_INET6: + skb->protocol = htons(ETH_P_IPV6); + break; + default: + WARN_ON_ONCE(1); + break; + } + + return xfrm_inner_mode_encap_remove(x, inner_mode, skb); +} + +/* Remove encapsulation header. + * + * The IP header will be moved over the top of the encapsulation header. + * + * On entry, skb_transport_header() shall point to where the IP header + * should be and skb_network_header() shall be set to where the IP header + * currently is. skb->data shall point to the start of the payload. + */ +static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb) +{ + int ihl = skb->data - skb_transport_header(skb); + + if (skb->transport_header != skb->network_header) { + memmove(skb_transport_header(skb), + skb_network_header(skb), ihl); + skb->network_header = skb->transport_header; + } + ip_hdr(skb)->tot_len = htons(skb->len + ihl); + skb_reset_transport_header(skb); + return 0; +} + +static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + int ihl = skb->data - skb_transport_header(skb); + + if (skb->transport_header != skb->network_header) { + memmove(skb_transport_header(skb), + skb_network_header(skb), ihl); + skb->network_header = skb->transport_header; + } + ipv6_hdr(skb)->payload_len = htons(skb->len + ihl - + sizeof(struct ipv6hdr)); + skb_reset_transport_header(skb); + return 0; +#else + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; +#endif +} + +static int xfrm_inner_mode_input(struct xfrm_state *x, + const struct xfrm_mode *inner_mode, + struct sk_buff *skb) +{ + switch (inner_mode->encap) { + case XFRM_MODE_BEET: + case XFRM_MODE_TUNNEL: + return xfrm_prepare_input(x, skb); + case XFRM_MODE_TRANSPORT: + if (inner_mode->family == AF_INET) + return xfrm4_transport_input(x, skb); + if (inner_mode->family == AF_INET6) + return xfrm6_transport_input(x, skb); + break; + case XFRM_MODE_ROUTEOPTIMIZATION: + WARN_ON_ONCE(1); + break; + default: + WARN_ON_ONCE(1); + break; + } + + return -EOPNOTSUPP; +} + +int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) +{ + const struct xfrm_state_afinfo *afinfo; + struct net *net = dev_net(skb->dev); + const struct xfrm_mode *inner_mode; + int err; + __be32 seq; + __be32 seq_hi; + struct xfrm_state *x = NULL; + xfrm_address_t *daddr; + u32 mark = skb->mark; + unsigned int family = AF_UNSPEC; + int decaps = 0; + int async = 0; + bool xfrm_gro = false; + bool crypto_done = false; + struct xfrm_offload *xo = xfrm_offload(skb); + struct sec_path *sp; + + if (encap_type < 0) { + x = xfrm_input_state(skb); + + if (unlikely(x->km.state != XFRM_STATE_VALID)) { + if (x->km.state == XFRM_STATE_ACQ) + XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); + else + XFRM_INC_STATS(net, + LINUX_MIB_XFRMINSTATEINVALID); + + if (encap_type == -1) + dev_put(skb->dev); + goto drop; + } + + family = x->outer_mode.family; + + /* An encap_type of -1 indicates async resumption. */ + if (encap_type == -1) { + async = 1; + seq = XFRM_SKB_CB(skb)->seq.input.low; + goto resume; + } + + /* encap_type < -1 indicates a GRO call. */ + encap_type = 0; + seq = XFRM_SPI_SKB_CB(skb)->seq; + + if (xo && (xo->flags & CRYPTO_DONE)) { + crypto_done = true; + family = XFRM_SPI_SKB_CB(skb)->family; + + if (!(xo->status & CRYPTO_SUCCESS)) { + if (xo->status & + (CRYPTO_TRANSPORT_AH_AUTH_FAILED | + CRYPTO_TRANSPORT_ESP_AUTH_FAILED | + CRYPTO_TUNNEL_AH_AUTH_FAILED | + CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { + + xfrm_audit_state_icvfail(x, skb, + x->type->proto); + x->stats.integrity_failed++; + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); + goto drop; + } + + if (xo->status & CRYPTO_INVALID_PROTOCOL) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); + goto drop; + } + + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + } + + goto lock; + } + + family = XFRM_SPI_SKB_CB(skb)->family; + + /* if tunnel is present override skb->mark value with tunnel i_key */ + switch (family) { + case AF_INET: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) + mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); + break; + case AF_INET6: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) + mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); + break; + } + + sp = secpath_set(skb); + if (!sp) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + + seq = 0; + if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) { + secpath_reset(skb); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + + daddr = (xfrm_address_t *)(skb_network_header(skb) + + XFRM_SPI_SKB_CB(skb)->daddroff); + do { + sp = skb_sec_path(skb); + + if (sp->len == XFRM_MAX_DEPTH) { + secpath_reset(skb); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family); + if (x == NULL) { + secpath_reset(skb); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); + xfrm_audit_state_notfound(skb, family, spi, seq); + goto drop; + } + + skb->mark = xfrm_smark_get(skb->mark, x); + + sp->xvec[sp->len++] = x; + + skb_dst_force(skb); + if (!skb_dst(skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + +lock: + spin_lock(&x->lock); + + if (unlikely(x->km.state != XFRM_STATE_VALID)) { + if (x->km.state == XFRM_STATE_ACQ) + XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR); + else + XFRM_INC_STATS(net, + LINUX_MIB_XFRMINSTATEINVALID); + goto drop_unlock; + } + + if ((x->encap ? x->encap->encap_type : 0) != encap_type) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); + goto drop_unlock; + } + + if (xfrm_replay_check(x, skb, seq)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); + goto drop_unlock; + } + + if (xfrm_state_check_expire(x)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); + goto drop_unlock; + } + + spin_unlock(&x->lock); + + if (xfrm_tunnel_check(skb, x, family)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); + goto drop; + } + + seq_hi = htonl(xfrm_replay_seqhi(x, seq)); + + XFRM_SKB_CB(skb)->seq.input.low = seq; + XFRM_SKB_CB(skb)->seq.input.hi = seq_hi; + + dev_hold(skb->dev); + + if (crypto_done) + nexthdr = x->type_offload->input_tail(x, skb); + else + nexthdr = x->type->input(x, skb); + + if (nexthdr == -EINPROGRESS) + return 0; +resume: + dev_put(skb->dev); + + spin_lock(&x->lock); + if (nexthdr < 0) { + if (nexthdr == -EBADMSG) { + xfrm_audit_state_icvfail(x, skb, + x->type->proto); + x->stats.integrity_failed++; + } + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); + goto drop_unlock; + } + + /* only the first xfrm gets the encap type */ + encap_type = 0; + + if (xfrm_replay_recheck(x, skb, seq)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); + goto drop_unlock; + } + + xfrm_replay_advance(x, seq); + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock(&x->lock); + + XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; + + inner_mode = &x->inner_mode; + + if (x->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); + if (inner_mode == NULL) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); + goto drop; + } + } + + if (xfrm_inner_mode_input(x, inner_mode, skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); + goto drop; + } + + if (x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL) { + decaps = 1; + break; + } + + /* + * We need the inner address. However, we only get here for + * transport mode so the outer address is identical. + */ + daddr = &x->id.daddr; + family = x->outer_mode.family; + + err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); + if (err < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + crypto_done = false; + } while (!err); + + err = xfrm_rcv_cb(skb, family, x->type->proto, 0); + if (err) + goto drop; + + nf_reset_ct(skb); + + if (decaps) { + sp = skb_sec_path(skb); + if (sp) + sp->olen = 0; + if (skb_valid_dst(skb)) + skb_dst_drop(skb); + gro_cells_receive(&gro_cells, skb); + return 0; + } else { + xo = xfrm_offload(skb); + if (xo) + xfrm_gro = xo->flags & XFRM_GRO; + + err = -EAFNOSUPPORT; + rcu_read_lock(); + afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family); + if (likely(afinfo)) + err = afinfo->transport_finish(skb, xfrm_gro || async); + rcu_read_unlock(); + if (xfrm_gro) { + sp = skb_sec_path(skb); + if (sp) + sp->olen = 0; + if (skb_valid_dst(skb)) + skb_dst_drop(skb); + gro_cells_receive(&gro_cells, skb); + return err; + } + + return err; + } + +drop_unlock: + spin_unlock(&x->lock); +drop: + xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1); + kfree_skb(skb); + return 0; +} +EXPORT_SYMBOL(xfrm_input); + +int xfrm_input_resume(struct sk_buff *skb, int nexthdr) +{ + return xfrm_input(skb, nexthdr, 0, -1); +} +EXPORT_SYMBOL(xfrm_input_resume); + +static void xfrm_trans_reinject(struct work_struct *work) +{ + struct xfrm_trans_tasklet *trans = container_of(work, struct xfrm_trans_tasklet, work); + struct sk_buff_head queue; + struct sk_buff *skb; + + __skb_queue_head_init(&queue); + spin_lock_bh(&trans->queue_lock); + skb_queue_splice_init(&trans->queue, &queue); + spin_unlock_bh(&trans->queue_lock); + + local_bh_disable(); + while ((skb = __skb_dequeue(&queue))) + XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, + NULL, skb); + local_bh_enable(); +} + +int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)) +{ + struct xfrm_trans_tasklet *trans; + + trans = this_cpu_ptr(&xfrm_trans_tasklet); + + if (skb_queue_len(&trans->queue) >= READ_ONCE(netdev_max_backlog)) + return -ENOBUFS; + + BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); + + XFRM_TRANS_SKB_CB(skb)->finish = finish; + XFRM_TRANS_SKB_CB(skb)->net = net; + spin_lock_bh(&trans->queue_lock); + __skb_queue_tail(&trans->queue, skb); + spin_unlock_bh(&trans->queue_lock); + schedule_work(&trans->work); + return 0; +} +EXPORT_SYMBOL(xfrm_trans_queue_net); + +int xfrm_trans_queue(struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)) +{ + return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); +} +EXPORT_SYMBOL(xfrm_trans_queue); + +void __init xfrm_input_init(void) +{ + int err; + int i; + + init_dummy_netdev(&xfrm_napi_dev); + err = gro_cells_init(&gro_cells, &xfrm_napi_dev); + if (err) + gro_cells.cells = NULL; + + for_each_possible_cpu(i) { + struct xfrm_trans_tasklet *trans; + + trans = &per_cpu(xfrm_trans_tasklet, i); + spin_lock_init(&trans->queue_lock); + __skb_queue_head_init(&trans->queue); + INIT_WORK(&trans->work, xfrm_trans_reinject); + } +} diff --git a/net/xfrm/xfrm_interface_core.c b/net/xfrm/xfrm_interface_core.c new file mode 100644 index 000000000..85501b77f --- /dev/null +++ b/net/xfrm/xfrm_interface_core.c @@ -0,0 +1,1242 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * XFRM virtual interface + * + * Copyright (C) 2018 secunet Security Networks AG + * + * Author: + * Steffen Klassert + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int xfrmi_dev_init(struct net_device *dev); +static void xfrmi_dev_setup(struct net_device *dev); +static struct rtnl_link_ops xfrmi_link_ops __read_mostly; +static unsigned int xfrmi_net_id __read_mostly; +static const struct net_device_ops xfrmi_netdev_ops; + +#define XFRMI_HASH_BITS 8 +#define XFRMI_HASH_SIZE BIT(XFRMI_HASH_BITS) + +struct xfrmi_net { + /* lists for storing interfaces in use */ + struct xfrm_if __rcu *xfrmi[XFRMI_HASH_SIZE]; + struct xfrm_if __rcu *collect_md_xfrmi; +}; + +static const struct nla_policy xfrm_lwt_policy[LWT_XFRM_MAX + 1] = { + [LWT_XFRM_IF_ID] = NLA_POLICY_MIN(NLA_U32, 1), + [LWT_XFRM_LINK] = NLA_POLICY_MIN(NLA_U32, 1), +}; + +static void xfrmi_destroy_state(struct lwtunnel_state *lwt) +{ +} + +static int xfrmi_build_state(struct net *net, struct nlattr *nla, + unsigned int family, const void *cfg, + struct lwtunnel_state **ts, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[LWT_XFRM_MAX + 1]; + struct lwtunnel_state *new_state; + struct xfrm_md_info *info; + int ret; + + ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack); + if (ret < 0) + return ret; + + if (!tb[LWT_XFRM_IF_ID]) { + NL_SET_ERR_MSG(extack, "if_id must be set"); + return -EINVAL; + } + + new_state = lwtunnel_state_alloc(sizeof(*info)); + if (!new_state) { + NL_SET_ERR_MSG(extack, "failed to create encap info"); + return -ENOMEM; + } + + new_state->type = LWTUNNEL_ENCAP_XFRM; + + info = lwt_xfrm_info(new_state); + + info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]); + + if (tb[LWT_XFRM_LINK]) + info->link = nla_get_u32(tb[LWT_XFRM_LINK]); + + *ts = new_state; + return 0; +} + +static int xfrmi_fill_encap_info(struct sk_buff *skb, + struct lwtunnel_state *lwt) +{ + struct xfrm_md_info *info = lwt_xfrm_info(lwt); + + if (nla_put_u32(skb, LWT_XFRM_IF_ID, info->if_id) || + (info->link && nla_put_u32(skb, LWT_XFRM_LINK, info->link))) + return -EMSGSIZE; + + return 0; +} + +static int xfrmi_encap_nlsize(struct lwtunnel_state *lwtstate) +{ + return nla_total_size(sizeof(u32)) + /* LWT_XFRM_IF_ID */ + nla_total_size(sizeof(u32)); /* LWT_XFRM_LINK */ +} + +static int xfrmi_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b) +{ + struct xfrm_md_info *a_info = lwt_xfrm_info(a); + struct xfrm_md_info *b_info = lwt_xfrm_info(b); + + return memcmp(a_info, b_info, sizeof(*a_info)); +} + +static const struct lwtunnel_encap_ops xfrmi_encap_ops = { + .build_state = xfrmi_build_state, + .destroy_state = xfrmi_destroy_state, + .fill_encap = xfrmi_fill_encap_info, + .get_encap_size = xfrmi_encap_nlsize, + .cmp_encap = xfrmi_encap_cmp, + .owner = THIS_MODULE, +}; + +#define for_each_xfrmi_rcu(start, xi) \ + for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) + +static u32 xfrmi_hash(u32 if_id) +{ + return hash_32(if_id, XFRMI_HASH_BITS); +} + +static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) +{ + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + struct xfrm_if *xi; + + for_each_xfrmi_rcu(xfrmn->xfrmi[xfrmi_hash(x->if_id)], xi) { + if (x->if_id == xi->p.if_id && + (xi->dev->flags & IFF_UP)) + return xi; + } + + xi = rcu_dereference(xfrmn->collect_md_xfrmi); + if (xi && (xi->dev->flags & IFF_UP)) + return xi; + + return NULL; +} + +static bool xfrmi_decode_session(struct sk_buff *skb, + unsigned short family, + struct xfrm_if_decode_session_result *res) +{ + struct net_device *dev; + struct xfrm_if *xi; + int ifindex = 0; + + if (!secpath_exists(skb) || !skb->dev) + return false; + + switch (family) { + case AF_INET6: + ifindex = inet6_sdif(skb); + break; + case AF_INET: + ifindex = inet_sdif(skb); + break; + } + + if (ifindex) { + struct net *net = xs_net(xfrm_input_state(skb)); + + dev = dev_get_by_index_rcu(net, ifindex); + } else { + dev = skb->dev; + } + + if (!dev || !(dev->flags & IFF_UP)) + return false; + if (dev->netdev_ops != &xfrmi_netdev_ops) + return false; + + xi = netdev_priv(dev); + res->net = xi->net; + + if (xi->p.collect_md) + res->if_id = xfrm_input_state(skb)->if_id; + else + res->if_id = xi->p.if_id; + return true; +} + +static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) +{ + struct xfrm_if __rcu **xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; + + rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); + rcu_assign_pointer(*xip, xi); +} + +static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) +{ + struct xfrm_if __rcu **xip; + struct xfrm_if *iter; + + for (xip = &xfrmn->xfrmi[xfrmi_hash(xi->p.if_id)]; + (iter = rtnl_dereference(*xip)) != NULL; + xip = &iter->next) { + if (xi == iter) { + rcu_assign_pointer(*xip, xi->next); + break; + } + } +} + +static void xfrmi_dev_free(struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + + gro_cells_destroy(&xi->gro_cells); + free_percpu(dev->tstats); +} + +static int xfrmi_create(struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct net *net = dev_net(dev); + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + int err; + + dev->rtnl_link_ops = &xfrmi_link_ops; + err = register_netdevice(dev); + if (err < 0) + goto out; + + if (xi->p.collect_md) + rcu_assign_pointer(xfrmn->collect_md_xfrmi, xi); + else + xfrmi_link(xfrmn, xi); + + return 0; + +out: + return err; +} + +static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p) +{ + struct xfrm_if __rcu **xip; + struct xfrm_if *xi; + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + + for (xip = &xfrmn->xfrmi[xfrmi_hash(p->if_id)]; + (xi = rtnl_dereference(*xip)) != NULL; + xip = &xi->next) + if (xi->p.if_id == p->if_id) + return xi; + + return NULL; +} + +static void xfrmi_dev_uninit(struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); + + if (xi->p.collect_md) + RCU_INIT_POINTER(xfrmn->collect_md_xfrmi, NULL); + else + xfrmi_unlink(xfrmn, xi); +} + +static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) +{ + skb_clear_tstamp(skb); + skb->pkt_type = PACKET_HOST; + skb->skb_iif = 0; + skb->ignore_df = 0; + skb_dst_drop(skb); + nf_reset_ct(skb); + nf_reset_trace(skb); + + if (!xnet) + return; + + ipvs_reset(skb); + secpath_reset(skb); + skb_orphan(skb); + skb->mark = 0; +} + +static int xfrmi_input(struct sk_buff *skb, int nexthdr, __be32 spi, + int encap_type, unsigned short family) +{ + struct sec_path *sp; + + sp = skb_sec_path(skb); + if (sp && (sp->len || sp->olen) && + !xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family)) + goto discard; + + XFRM_SPI_SKB_CB(skb)->family = family; + if (family == AF_INET) { + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL; + } else { + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; + } + + return xfrm_input(skb, nexthdr, spi, encap_type); +discard: + kfree_skb(skb); + return 0; +} + +static int xfrmi4_rcv(struct sk_buff *skb) +{ + return xfrmi_input(skb, ip_hdr(skb)->protocol, 0, 0, AF_INET); +} + +static int xfrmi6_rcv(struct sk_buff *skb) +{ + return xfrmi_input(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], + 0, 0, AF_INET6); +} + +static int xfrmi4_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) +{ + return xfrmi_input(skb, nexthdr, spi, encap_type, AF_INET); +} + +static int xfrmi6_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) +{ + return xfrmi_input(skb, nexthdr, spi, encap_type, AF_INET6); +} + +static int xfrmi_rcv_cb(struct sk_buff *skb, int err) +{ + const struct xfrm_mode *inner_mode; + struct net_device *dev; + struct xfrm_state *x; + struct xfrm_if *xi; + bool xnet; + int link; + + if (err && !secpath_exists(skb)) + return 0; + + x = xfrm_input_state(skb); + + xi = xfrmi_lookup(xs_net(x), x); + if (!xi) + return 1; + + link = skb->dev->ifindex; + dev = xi->dev; + skb->dev = dev; + + if (err) { + DEV_STATS_INC(dev, rx_errors); + DEV_STATS_INC(dev, rx_dropped); + + return 0; + } + + xnet = !net_eq(xi->net, dev_net(skb->dev)); + + if (xnet) { + inner_mode = &x->inner_mode; + + if (x->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); + if (inner_mode == NULL) { + XFRM_INC_STATS(dev_net(skb->dev), + LINUX_MIB_XFRMINSTATEMODEERROR); + return -EINVAL; + } + } + + if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, + inner_mode->family)) + return -EPERM; + } + + xfrmi_scrub_packet(skb, xnet); + if (xi->p.collect_md) { + struct metadata_dst *md_dst; + + md_dst = metadata_dst_alloc(0, METADATA_XFRM, GFP_ATOMIC); + if (!md_dst) + return -ENOMEM; + + md_dst->u.xfrm_info.if_id = x->if_id; + md_dst->u.xfrm_info.link = link; + skb_dst_set(skb, (struct dst_entry *)md_dst); + } + dev_sw_netstats_rx_add(dev, skb->len); + + return 0; +} + +static int +xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct dst_entry *dst = skb_dst(skb); + unsigned int length = skb->len; + struct net_device *tdev; + struct xfrm_state *x; + int err = -1; + u32 if_id; + int mtu; + + if (xi->p.collect_md) { + struct xfrm_md_info *md_info = skb_xfrm_md_info(skb); + + if (unlikely(!md_info)) + return -EINVAL; + + if_id = md_info->if_id; + fl->flowi_oif = md_info->link; + } else { + if_id = xi->p.if_id; + } + + dst_hold(dst); + dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, if_id); + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + dst = NULL; + goto tx_err_link_failure; + } + + x = dst->xfrm; + if (!x) + goto tx_err_link_failure; + + if (x->if_id != if_id) + goto tx_err_link_failure; + + tdev = dst->dev; + + if (tdev == dev) { + DEV_STATS_INC(dev, collisions); + net_warn_ratelimited("%s: Local routing loop detected!\n", + dev->name); + goto tx_err_dst_release; + } + + mtu = dst_mtu(dst); + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && !skb_gso_validate_network_len(skb, mtu))) { + skb_dst_update_pmtu_no_confirm(skb, mtu); + + if (skb->protocol == htons(ETH_P_IPV6)) { + if (mtu < IPV6_MIN_MTU) + mtu = IPV6_MIN_MTU; + + if (skb->len > 1280) + icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); + else + goto xmit; + } else { + if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) + goto xmit; + icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, + htonl(mtu)); + } + + dst_release(dst); + return -EMSGSIZE; + } + +xmit: + xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); + skb_dst_set(skb, dst); + skb->dev = tdev; + + err = dst_output(xi->net, skb->sk, skb); + if (net_xmit_eval(err) == 0) { + dev_sw_netstats_tx_add(dev, 1, length); + } else { + DEV_STATS_INC(dev, tx_errors); + DEV_STATS_INC(dev, tx_aborted_errors); + } + + return 0; +tx_err_link_failure: + DEV_STATS_INC(dev, tx_carrier_errors); + dst_link_failure(skb); +tx_err_dst_release: + dst_release(dst); + return err; +} + +static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct dst_entry *dst = skb_dst(skb); + struct flowi fl; + int ret; + + memset(&fl, 0, sizeof(fl)); + + switch (skb->protocol) { + case htons(ETH_P_IPV6): + memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); + xfrm_decode_session(skb, &fl, AF_INET6); + if (!dst) { + fl.u.ip6.flowi6_oif = dev->ifindex; + fl.u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; + dst = ip6_route_output(dev_net(dev), NULL, &fl.u.ip6); + if (dst->error) { + dst_release(dst); + DEV_STATS_INC(dev, tx_carrier_errors); + goto tx_err; + } + skb_dst_set(skb, dst); + } + break; + case htons(ETH_P_IP): + memset(IPCB(skb), 0, sizeof(*IPCB(skb))); + xfrm_decode_session(skb, &fl, AF_INET); + if (!dst) { + struct rtable *rt; + + fl.u.ip4.flowi4_oif = dev->ifindex; + fl.u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; + rt = __ip_route_output_key(dev_net(dev), &fl.u.ip4); + if (IS_ERR(rt)) { + DEV_STATS_INC(dev, tx_carrier_errors); + goto tx_err; + } + skb_dst_set(skb, &rt->dst); + } + break; + default: + goto tx_err; + } + + fl.flowi_oif = xi->p.link; + + ret = xfrmi_xmit2(skb, dev, &fl); + if (ret < 0) + goto tx_err; + + return NETDEV_TX_OK; + +tx_err: + DEV_STATS_INC(dev, tx_errors); + DEV_STATS_INC(dev, tx_dropped); + kfree_skb(skb); + return NETDEV_TX_OK; +} + +static int xfrmi4_err(struct sk_buff *skb, u32 info) +{ + const struct iphdr *iph = (const struct iphdr *)skb->data; + struct net *net = dev_net(skb->dev); + int protocol = iph->protocol; + struct ip_comp_hdr *ipch; + struct ip_esp_hdr *esph; + struct ip_auth_hdr *ah ; + struct xfrm_state *x; + struct xfrm_if *xi; + __be32 spi; + + switch (protocol) { + case IPPROTO_ESP: + esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); + spi = esph->spi; + break; + case IPPROTO_AH: + ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); + spi = ah->spi; + break; + case IPPROTO_COMP: + ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); + spi = htonl(ntohs(ipch->cpi)); + break; + default: + return 0; + } + + switch (icmp_hdr(skb)->type) { + case ICMP_DEST_UNREACH: + if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) + return 0; + break; + case ICMP_REDIRECT: + break; + default: + return 0; + } + + x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, + spi, protocol, AF_INET); + if (!x) + return 0; + + xi = xfrmi_lookup(net, x); + if (!xi) { + xfrm_state_put(x); + return -1; + } + + if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) + ipv4_update_pmtu(skb, net, info, 0, protocol); + else + ipv4_redirect(skb, net, 0, protocol); + xfrm_state_put(x); + + return 0; +} + +static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info) +{ + const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; + struct net *net = dev_net(skb->dev); + int protocol = iph->nexthdr; + struct ip_comp_hdr *ipch; + struct ip_esp_hdr *esph; + struct ip_auth_hdr *ah; + struct xfrm_state *x; + struct xfrm_if *xi; + __be32 spi; + + switch (protocol) { + case IPPROTO_ESP: + esph = (struct ip_esp_hdr *)(skb->data + offset); + spi = esph->spi; + break; + case IPPROTO_AH: + ah = (struct ip_auth_hdr *)(skb->data + offset); + spi = ah->spi; + break; + case IPPROTO_COMP: + ipch = (struct ip_comp_hdr *)(skb->data + offset); + spi = htonl(ntohs(ipch->cpi)); + break; + default: + return 0; + } + + if (type != ICMPV6_PKT_TOOBIG && + type != NDISC_REDIRECT) + return 0; + + x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, + spi, protocol, AF_INET6); + if (!x) + return 0; + + xi = xfrmi_lookup(net, x); + if (!xi) { + xfrm_state_put(x); + return -1; + } + + if (type == NDISC_REDIRECT) + ip6_redirect(skb, net, skb->dev->ifindex, 0, + sock_net_uid(net, NULL)); + else + ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); + xfrm_state_put(x); + + return 0; +} + +static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) +{ + if (xi->p.link != p->link) + return -EINVAL; + + xi->p.if_id = p->if_id; + + return 0; +} + +static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) +{ + struct net *net = xi->net; + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + int err; + + xfrmi_unlink(xfrmn, xi); + synchronize_net(); + err = xfrmi_change(xi, p); + xfrmi_link(xfrmn, xi); + netdev_state_change(xi->dev); + return err; +} + +static int xfrmi_get_iflink(const struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + + return xi->p.link; +} + +static const struct net_device_ops xfrmi_netdev_ops = { + .ndo_init = xfrmi_dev_init, + .ndo_uninit = xfrmi_dev_uninit, + .ndo_start_xmit = xfrmi_xmit, + .ndo_get_stats64 = dev_get_tstats64, + .ndo_get_iflink = xfrmi_get_iflink, +}; + +static void xfrmi_dev_setup(struct net_device *dev) +{ + dev->netdev_ops = &xfrmi_netdev_ops; + dev->header_ops = &ip_tunnel_header_ops; + dev->type = ARPHRD_NONE; + dev->mtu = ETH_DATA_LEN; + dev->min_mtu = ETH_MIN_MTU; + dev->max_mtu = IP_MAX_MTU; + dev->flags = IFF_NOARP; + dev->needs_free_netdev = true; + dev->priv_destructor = xfrmi_dev_free; + netif_keep_dst(dev); + + eth_broadcast_addr(dev->broadcast); +} + +#define XFRMI_FEATURES (NETIF_F_SG | \ + NETIF_F_FRAGLIST | \ + NETIF_F_GSO_SOFTWARE | \ + NETIF_F_HW_CSUM) + +static int xfrmi_dev_init(struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct net_device *phydev = __dev_get_by_index(xi->net, xi->p.link); + int err; + + dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); + if (!dev->tstats) + return -ENOMEM; + + err = gro_cells_init(&xi->gro_cells, dev); + if (err) { + free_percpu(dev->tstats); + return err; + } + + dev->features |= NETIF_F_LLTX; + dev->features |= XFRMI_FEATURES; + dev->hw_features |= XFRMI_FEATURES; + + if (phydev) { + dev->needed_headroom = phydev->needed_headroom; + dev->needed_tailroom = phydev->needed_tailroom; + + if (is_zero_ether_addr(dev->dev_addr)) + eth_hw_addr_inherit(dev, phydev); + if (is_zero_ether_addr(dev->broadcast)) + memcpy(dev->broadcast, phydev->broadcast, + dev->addr_len); + } else { + eth_hw_addr_random(dev); + eth_broadcast_addr(dev->broadcast); + } + + return 0; +} + +static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + return 0; +} + +static void xfrmi_netlink_parms(struct nlattr *data[], + struct xfrm_if_parms *parms) +{ + memset(parms, 0, sizeof(*parms)); + + if (!data) + return; + + if (data[IFLA_XFRM_LINK]) + parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); + + if (data[IFLA_XFRM_IF_ID]) + parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); + + if (data[IFLA_XFRM_COLLECT_METADATA]) + parms->collect_md = true; +} + +static int xfrmi_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct net *net = dev_net(dev); + struct xfrm_if_parms p = {}; + struct xfrm_if *xi; + int err; + + xfrmi_netlink_parms(data, &p); + if (p.collect_md) { + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + + if (p.link || p.if_id) { + NL_SET_ERR_MSG(extack, "link and if_id must be zero"); + return -EINVAL; + } + + if (rtnl_dereference(xfrmn->collect_md_xfrmi)) + return -EEXIST; + + } else { + if (!p.if_id) { + NL_SET_ERR_MSG(extack, "if_id must be non zero"); + return -EINVAL; + } + + xi = xfrmi_locate(net, &p); + if (xi) + return -EEXIST; + } + + xi = netdev_priv(dev); + xi->p = p; + xi->net = net; + xi->dev = dev; + + err = xfrmi_create(dev); + return err; +} + +static void xfrmi_dellink(struct net_device *dev, struct list_head *head) +{ + unregister_netdevice_queue(dev, head); +} + +static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], + struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct net *net = xi->net; + struct xfrm_if_parms p = {}; + + xfrmi_netlink_parms(data, &p); + if (!p.if_id) { + NL_SET_ERR_MSG(extack, "if_id must be non zero"); + return -EINVAL; + } + + if (p.collect_md) { + NL_SET_ERR_MSG(extack, "collect_md can't be changed"); + return -EINVAL; + } + + xi = xfrmi_locate(net, &p); + if (!xi) { + xi = netdev_priv(dev); + } else { + if (xi->dev != dev) + return -EEXIST; + if (xi->p.collect_md) { + NL_SET_ERR_MSG(extack, + "device can't be changed to collect_md"); + return -EINVAL; + } + } + + return xfrmi_update(xi, &p); +} + +static size_t xfrmi_get_size(const struct net_device *dev) +{ + return + /* IFLA_XFRM_LINK */ + nla_total_size(4) + + /* IFLA_XFRM_IF_ID */ + nla_total_size(4) + + /* IFLA_XFRM_COLLECT_METADATA */ + nla_total_size(0) + + 0; +} + +static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + struct xfrm_if_parms *parm = &xi->p; + + if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || + nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id) || + (xi->p.collect_md && nla_put_flag(skb, IFLA_XFRM_COLLECT_METADATA))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static struct net *xfrmi_get_link_net(const struct net_device *dev) +{ + struct xfrm_if *xi = netdev_priv(dev); + + return xi->net; +} + +static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { + [IFLA_XFRM_UNSPEC] = { .strict_start_type = IFLA_XFRM_COLLECT_METADATA }, + [IFLA_XFRM_LINK] = { .type = NLA_U32 }, + [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, + [IFLA_XFRM_COLLECT_METADATA] = { .type = NLA_FLAG }, +}; + +static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { + .kind = "xfrm", + .maxtype = IFLA_XFRM_MAX, + .policy = xfrmi_policy, + .priv_size = sizeof(struct xfrm_if), + .setup = xfrmi_dev_setup, + .validate = xfrmi_validate, + .newlink = xfrmi_newlink, + .dellink = xfrmi_dellink, + .changelink = xfrmi_changelink, + .get_size = xfrmi_get_size, + .fill_info = xfrmi_fill_info, + .get_link_net = xfrmi_get_link_net, +}; + +static void __net_exit xfrmi_exit_batch_net(struct list_head *net_exit_list) +{ + struct net *net; + LIST_HEAD(list); + + rtnl_lock(); + list_for_each_entry(net, net_exit_list, exit_list) { + struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); + struct xfrm_if __rcu **xip; + struct xfrm_if *xi; + int i; + + for (i = 0; i < XFRMI_HASH_SIZE; i++) { + for (xip = &xfrmn->xfrmi[i]; + (xi = rtnl_dereference(*xip)) != NULL; + xip = &xi->next) + unregister_netdevice_queue(xi->dev, &list); + } + xi = rtnl_dereference(xfrmn->collect_md_xfrmi); + if (xi) + unregister_netdevice_queue(xi->dev, &list); + } + unregister_netdevice_many(&list); + rtnl_unlock(); +} + +static struct pernet_operations xfrmi_net_ops = { + .exit_batch = xfrmi_exit_batch_net, + .id = &xfrmi_net_id, + .size = sizeof(struct xfrmi_net), +}; + +static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { + .handler = xfrmi6_rcv, + .input_handler = xfrmi6_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi6_err, + .priority = 10, +}; + +static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { + .handler = xfrm6_rcv, + .input_handler = xfrm_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi6_err, + .priority = 10, +}; + +static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { + .handler = xfrm6_rcv, + .input_handler = xfrm_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi6_err, + .priority = 10, +}; + +#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) +static int xfrmi6_rcv_tunnel(struct sk_buff *skb) +{ + const xfrm_address_t *saddr; + __be32 spi; + + saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr; + spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr); + + return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL); +} + +static struct xfrm6_tunnel xfrmi_ipv6_handler __read_mostly = { + .handler = xfrmi6_rcv_tunnel, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi6_err, + .priority = 2, +}; + +static struct xfrm6_tunnel xfrmi_ip6ip_handler __read_mostly = { + .handler = xfrmi6_rcv_tunnel, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi6_err, + .priority = 2, +}; +#endif + +static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { + .handler = xfrmi4_rcv, + .input_handler = xfrmi4_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi4_err, + .priority = 10, +}; + +static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { + .handler = xfrm4_rcv, + .input_handler = xfrm_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi4_err, + .priority = 10, +}; + +static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { + .handler = xfrm4_rcv, + .input_handler = xfrm_input, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi4_err, + .priority = 10, +}; + +#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) +static int xfrmi4_rcv_tunnel(struct sk_buff *skb) +{ + return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr); +} + +static struct xfrm_tunnel xfrmi_ipip_handler __read_mostly = { + .handler = xfrmi4_rcv_tunnel, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi4_err, + .priority = 3, +}; + +static struct xfrm_tunnel xfrmi_ipip6_handler __read_mostly = { + .handler = xfrmi4_rcv_tunnel, + .cb_handler = xfrmi_rcv_cb, + .err_handler = xfrmi4_err, + .priority = 2, +}; +#endif + +static int __init xfrmi4_init(void) +{ + int err; + + err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); + if (err < 0) + goto xfrm_proto_esp_failed; + err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); + if (err < 0) + goto xfrm_proto_ah_failed; + err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); + if (err < 0) + goto xfrm_proto_comp_failed; +#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) + err = xfrm4_tunnel_register(&xfrmi_ipip_handler, AF_INET); + if (err < 0) + goto xfrm_tunnel_ipip_failed; + err = xfrm4_tunnel_register(&xfrmi_ipip6_handler, AF_INET6); + if (err < 0) + goto xfrm_tunnel_ipip6_failed; +#endif + + return 0; + +#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) +xfrm_tunnel_ipip6_failed: + xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); +xfrm_tunnel_ipip_failed: + xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); +#endif +xfrm_proto_comp_failed: + xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); +xfrm_proto_ah_failed: + xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); +xfrm_proto_esp_failed: + return err; +} + +static void xfrmi4_fini(void) +{ +#if IS_REACHABLE(CONFIG_INET_XFRM_TUNNEL) + xfrm4_tunnel_deregister(&xfrmi_ipip6_handler, AF_INET6); + xfrm4_tunnel_deregister(&xfrmi_ipip_handler, AF_INET); +#endif + xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); + xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); + xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); +} + +static int __init xfrmi6_init(void) +{ + int err; + + err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); + if (err < 0) + goto xfrm_proto_esp_failed; + err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); + if (err < 0) + goto xfrm_proto_ah_failed; + err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); + if (err < 0) + goto xfrm_proto_comp_failed; +#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) + err = xfrm6_tunnel_register(&xfrmi_ipv6_handler, AF_INET6); + if (err < 0) + goto xfrm_tunnel_ipv6_failed; + err = xfrm6_tunnel_register(&xfrmi_ip6ip_handler, AF_INET); + if (err < 0) + goto xfrm_tunnel_ip6ip_failed; +#endif + + return 0; + +#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) +xfrm_tunnel_ip6ip_failed: + xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); +xfrm_tunnel_ipv6_failed: + xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); +#endif +xfrm_proto_comp_failed: + xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); +xfrm_proto_ah_failed: + xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); +xfrm_proto_esp_failed: + return err; +} + +static void xfrmi6_fini(void) +{ +#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL) + xfrm6_tunnel_deregister(&xfrmi_ip6ip_handler, AF_INET); + xfrm6_tunnel_deregister(&xfrmi_ipv6_handler, AF_INET6); +#endif + xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); + xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); + xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); +} + +static const struct xfrm_if_cb xfrm_if_cb = { + .decode_session = xfrmi_decode_session, +}; + +static int __init xfrmi_init(void) +{ + const char *msg; + int err; + + pr_info("IPsec XFRM device driver\n"); + + msg = "tunnel device"; + err = register_pernet_device(&xfrmi_net_ops); + if (err < 0) + goto pernet_dev_failed; + + msg = "xfrm4 protocols"; + err = xfrmi4_init(); + if (err < 0) + goto xfrmi4_failed; + + msg = "xfrm6 protocols"; + err = xfrmi6_init(); + if (err < 0) + goto xfrmi6_failed; + + + msg = "netlink interface"; + err = rtnl_link_register(&xfrmi_link_ops); + if (err < 0) + goto rtnl_link_failed; + + lwtunnel_encap_add_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); + + xfrm_if_register_cb(&xfrm_if_cb); + + return err; + +rtnl_link_failed: + xfrmi6_fini(); +xfrmi6_failed: + xfrmi4_fini(); +xfrmi4_failed: + unregister_pernet_device(&xfrmi_net_ops); +pernet_dev_failed: + pr_err("xfrmi init: failed to register %s\n", msg); + return err; +} + +static void __exit xfrmi_fini(void) +{ + xfrm_if_unregister_cb(); + lwtunnel_encap_del_ops(&xfrmi_encap_ops, LWTUNNEL_ENCAP_XFRM); + rtnl_link_unregister(&xfrmi_link_ops); + xfrmi4_fini(); + xfrmi6_fini(); + unregister_pernet_device(&xfrmi_net_ops); +} + +module_init(xfrmi_init); +module_exit(xfrmi_fini); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_RTNL_LINK("xfrm"); +MODULE_ALIAS_NETDEV("xfrm0"); +MODULE_AUTHOR("Steffen Klassert"); +MODULE_DESCRIPTION("XFRM virtual interface"); diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c new file mode 100644 index 000000000..80143360b --- /dev/null +++ b/net/xfrm/xfrm_ipcomp.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * IP Payload Compression Protocol (IPComp) - RFC3173. + * + * Copyright (c) 2003 James Morris + * Copyright (c) 2003-2008 Herbert Xu + * + * Todo: + * - Tunable compression parameters. + * - Compression stats. + * - Adaptive compression. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ipcomp_tfms { + struct list_head list; + struct crypto_comp * __percpu *tfms; + int users; +}; + +static DEFINE_MUTEX(ipcomp_resource_mutex); +static void * __percpu *ipcomp_scratches; +static int ipcomp_scratch_users; +static LIST_HEAD(ipcomp_tfms_list); + +static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipcomp_data *ipcd = x->data; + const int plen = skb->len; + int dlen = IPCOMP_SCRATCH_SIZE; + const u8 *start = skb->data; + u8 *scratch = *this_cpu_ptr(ipcomp_scratches); + struct crypto_comp *tfm = *this_cpu_ptr(ipcd->tfms); + int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); + int len; + + if (err) + return err; + + if (dlen < (plen + sizeof(struct ip_comp_hdr))) + return -EINVAL; + + len = dlen - plen; + if (len > skb_tailroom(skb)) + len = skb_tailroom(skb); + + __skb_put(skb, len); + + len += plen; + skb_copy_to_linear_data(skb, scratch, len); + + while ((scratch += len, dlen -= len) > 0) { + skb_frag_t *frag; + struct page *page; + + if (WARN_ON(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) + return -EMSGSIZE; + + frag = skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags; + page = alloc_page(GFP_ATOMIC); + + if (!page) + return -ENOMEM; + + __skb_frag_set_page(frag, page); + + len = PAGE_SIZE; + if (dlen < len) + len = dlen; + + skb_frag_off_set(frag, 0); + skb_frag_size_set(frag, len); + memcpy(skb_frag_address(frag), scratch, len); + + skb->truesize += len; + skb->data_len += len; + skb->len += len; + + skb_shinfo(skb)->nr_frags++; + } + + return 0; +} + +int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb) +{ + int nexthdr; + int err = -ENOMEM; + struct ip_comp_hdr *ipch; + + if (skb_linearize_cow(skb)) + goto out; + + skb->ip_summed = CHECKSUM_NONE; + + /* Remove ipcomp header and decompress original payload */ + ipch = (void *)skb->data; + nexthdr = ipch->nexthdr; + + skb->transport_header = skb->network_header + sizeof(*ipch); + __skb_pull(skb, sizeof(*ipch)); + err = ipcomp_decompress(x, skb); + if (err) + goto out; + + err = nexthdr; + +out: + return err; +} +EXPORT_SYMBOL_GPL(ipcomp_input); + +static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipcomp_data *ipcd = x->data; + const int plen = skb->len; + int dlen = IPCOMP_SCRATCH_SIZE; + u8 *start = skb->data; + struct crypto_comp *tfm; + u8 *scratch; + int err; + + local_bh_disable(); + scratch = *this_cpu_ptr(ipcomp_scratches); + tfm = *this_cpu_ptr(ipcd->tfms); + err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); + if (err) + goto out; + + if ((dlen + sizeof(struct ip_comp_hdr)) >= plen) { + err = -EMSGSIZE; + goto out; + } + + memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen); + local_bh_enable(); + + pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr)); + return 0; + +out: + local_bh_enable(); + return err; +} + +int ipcomp_output(struct xfrm_state *x, struct sk_buff *skb) +{ + int err; + struct ip_comp_hdr *ipch; + struct ipcomp_data *ipcd = x->data; + + if (skb->len < ipcd->threshold) { + /* Don't bother compressing */ + goto out_ok; + } + + if (skb_linearize_cow(skb)) + goto out_ok; + + err = ipcomp_compress(x, skb); + + if (err) { + goto out_ok; + } + + /* Install ipcomp header, convert into ipcomp datagram. */ + ipch = ip_comp_hdr(skb); + ipch->nexthdr = *skb_mac_header(skb); + ipch->flags = 0; + ipch->cpi = htons((u16 )ntohl(x->id.spi)); + *skb_mac_header(skb) = IPPROTO_COMP; +out_ok: + skb_push(skb, -skb_network_offset(skb)); + return 0; +} +EXPORT_SYMBOL_GPL(ipcomp_output); + +static void ipcomp_free_scratches(void) +{ + int i; + void * __percpu *scratches; + + if (--ipcomp_scratch_users) + return; + + scratches = ipcomp_scratches; + if (!scratches) + return; + + for_each_possible_cpu(i) + vfree(*per_cpu_ptr(scratches, i)); + + free_percpu(scratches); + ipcomp_scratches = NULL; +} + +static void * __percpu *ipcomp_alloc_scratches(void) +{ + void * __percpu *scratches; + int i; + + if (ipcomp_scratch_users++) + return ipcomp_scratches; + + scratches = alloc_percpu(void *); + if (!scratches) + return NULL; + + ipcomp_scratches = scratches; + + for_each_possible_cpu(i) { + void *scratch; + + scratch = vmalloc_node(IPCOMP_SCRATCH_SIZE, cpu_to_node(i)); + if (!scratch) + return NULL; + *per_cpu_ptr(scratches, i) = scratch; + } + + return scratches; +} + +static void ipcomp_free_tfms(struct crypto_comp * __percpu *tfms) +{ + struct ipcomp_tfms *pos; + int cpu; + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + if (pos->tfms == tfms) + break; + } + + WARN_ON(list_entry_is_head(pos, &ipcomp_tfms_list, list)); + + if (--pos->users) + return; + + list_del(&pos->list); + kfree(pos); + + if (!tfms) + return; + + for_each_possible_cpu(cpu) { + struct crypto_comp *tfm = *per_cpu_ptr(tfms, cpu); + crypto_free_comp(tfm); + } + free_percpu(tfms); +} + +static struct crypto_comp * __percpu *ipcomp_alloc_tfms(const char *alg_name) +{ + struct ipcomp_tfms *pos; + struct crypto_comp * __percpu *tfms; + int cpu; + + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + struct crypto_comp *tfm; + + /* This can be any valid CPU ID so we don't need locking. */ + tfm = this_cpu_read(*pos->tfms); + + if (!strcmp(crypto_comp_name(tfm), alg_name)) { + pos->users++; + return pos->tfms; + } + } + + pos = kmalloc(sizeof(*pos), GFP_KERNEL); + if (!pos) + return NULL; + + pos->users = 1; + INIT_LIST_HEAD(&pos->list); + list_add(&pos->list, &ipcomp_tfms_list); + + pos->tfms = tfms = alloc_percpu(struct crypto_comp *); + if (!tfms) + goto error; + + for_each_possible_cpu(cpu) { + struct crypto_comp *tfm = crypto_alloc_comp(alg_name, 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(tfm)) + goto error; + *per_cpu_ptr(tfms, cpu) = tfm; + } + + return tfms; + +error: + ipcomp_free_tfms(tfms); + return NULL; +} + +static void ipcomp_free_data(struct ipcomp_data *ipcd) +{ + if (ipcd->tfms) + ipcomp_free_tfms(ipcd->tfms); + ipcomp_free_scratches(); +} + +void ipcomp_destroy(struct xfrm_state *x) +{ + struct ipcomp_data *ipcd = x->data; + if (!ipcd) + return; + xfrm_state_delete_tunnel(x); + mutex_lock(&ipcomp_resource_mutex); + ipcomp_free_data(ipcd); + mutex_unlock(&ipcomp_resource_mutex); + kfree(ipcd); +} +EXPORT_SYMBOL_GPL(ipcomp_destroy); + +int ipcomp_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack) +{ + int err; + struct ipcomp_data *ipcd; + struct xfrm_algo_desc *calg_desc; + + err = -EINVAL; + if (!x->calg) { + NL_SET_ERR_MSG(extack, "Missing required compression algorithm"); + goto out; + } + + if (x->encap) { + NL_SET_ERR_MSG(extack, "IPComp is not compatible with encapsulation"); + goto out; + } + + err = -ENOMEM; + ipcd = kzalloc(sizeof(*ipcd), GFP_KERNEL); + if (!ipcd) + goto out; + + mutex_lock(&ipcomp_resource_mutex); + if (!ipcomp_alloc_scratches()) + goto error; + + ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name); + if (!ipcd->tfms) + goto error; + mutex_unlock(&ipcomp_resource_mutex); + + calg_desc = xfrm_calg_get_byname(x->calg->alg_name, 0); + BUG_ON(!calg_desc); + ipcd->threshold = calg_desc->uinfo.comp.threshold; + x->data = ipcd; + err = 0; +out: + return err; + +error: + ipcomp_free_data(ipcd); + mutex_unlock(&ipcomp_resource_mutex); + kfree(ipcd); + goto out; +} +EXPORT_SYMBOL_GPL(ipcomp_init_state); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) - RFC3173"); +MODULE_AUTHOR("James Morris "); diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c new file mode 100644 index 000000000..9a5e79a38 --- /dev/null +++ b/net/xfrm/xfrm_output.c @@ -0,0 +1,909 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * xfrm_output.c - Common IPsec encapsulation code. + * + * Copyright (c) 2007 Herbert Xu + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if IS_ENABLED(CONFIG_IPV6) +#include +#include +#endif + +#include "xfrm_inout.h" + +static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb); +static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb); + +static int xfrm_skb_check_space(struct sk_buff *skb) +{ + struct dst_entry *dst = skb_dst(skb); + int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) + - skb_headroom(skb); + int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); + + if (nhead <= 0) { + if (ntail <= 0) + return 0; + nhead = 0; + } else if (ntail < 0) + ntail = 0; + + return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); +} + +/* Children define the path of the packet through the + * Linux networking. Thus, destinations are stackable. + */ + +static struct dst_entry *skb_dst_pop(struct sk_buff *skb) +{ + struct dst_entry *child = dst_clone(xfrm_dst_child(skb_dst(skb))); + + skb_dst_drop(skb); + return child; +} + +/* Add encapsulation header. + * + * The IP header will be moved forward to make space for the encapsulation + * header. + */ +static int xfrm4_transport_output(struct xfrm_state *x, struct sk_buff *skb) +{ + struct iphdr *iph = ip_hdr(skb); + int ihl = iph->ihl * 4; + + skb_set_inner_transport_header(skb, skb_transport_offset(skb)); + + skb_set_network_header(skb, -x->props.header_len); + skb->mac_header = skb->network_header + + offsetof(struct iphdr, protocol); + skb->transport_header = skb->network_header + ihl; + __skb_pull(skb, ihl); + memmove(skb_network_header(skb), iph, ihl); + return 0; +} + +#if IS_ENABLED(CONFIG_IPV6_MIP6) +static int mip6_rthdr_offset(struct sk_buff *skb, u8 **nexthdr, int type) +{ + const unsigned char *nh = skb_network_header(skb); + unsigned int offset = sizeof(struct ipv6hdr); + unsigned int packet_len; + int found_rhdr = 0; + + packet_len = skb_tail_pointer(skb) - nh; + *nexthdr = &ipv6_hdr(skb)->nexthdr; + + while (offset <= packet_len) { + struct ipv6_opt_hdr *exthdr; + + switch (**nexthdr) { + case NEXTHDR_HOP: + break; + case NEXTHDR_ROUTING: + if (type == IPPROTO_ROUTING && offset + 3 <= packet_len) { + struct ipv6_rt_hdr *rt; + + rt = (struct ipv6_rt_hdr *)(nh + offset); + if (rt->type != 0) + return offset; + } + found_rhdr = 1; + break; + case NEXTHDR_DEST: + /* HAO MUST NOT appear more than once. + * XXX: It is better to try to find by the end of + * XXX: packet if HAO exists. + */ + if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) { + net_dbg_ratelimited("mip6: hao exists already, override\n"); + return offset; + } + + if (found_rhdr) + return offset; + + break; + default: + return offset; + } + + if (offset + sizeof(struct ipv6_opt_hdr) > packet_len) + return -EINVAL; + + exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + + offset); + offset += ipv6_optlen(exthdr); + if (offset > IPV6_MAXPLEN) + return -EINVAL; + *nexthdr = &exthdr->nexthdr; + } + + return -EINVAL; +} +#endif + +#if IS_ENABLED(CONFIG_IPV6) +static int xfrm6_hdr_offset(struct xfrm_state *x, struct sk_buff *skb, u8 **prevhdr) +{ + switch (x->type->proto) { +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPPROTO_DSTOPTS: + case IPPROTO_ROUTING: + return mip6_rthdr_offset(skb, prevhdr, x->type->proto); +#endif + default: + break; + } + + return ip6_find_1stfragopt(skb, prevhdr); +} +#endif + +/* Add encapsulation header. + * + * The IP header and mutable extension headers will be moved forward to make + * space for the encapsulation header. + */ +static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + struct ipv6hdr *iph; + u8 *prevhdr; + int hdr_len; + + iph = ipv6_hdr(skb); + skb_set_inner_transport_header(skb, skb_transport_offset(skb)); + + hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr); + if (hdr_len < 0) + return hdr_len; + skb_set_mac_header(skb, + (prevhdr - x->props.header_len) - skb->data); + skb_set_network_header(skb, -x->props.header_len); + skb->transport_header = skb->network_header + hdr_len; + __skb_pull(skb, hdr_len); + memmove(ipv6_hdr(skb), iph, hdr_len); + return 0; +#else + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; +#endif +} + +/* Add route optimization header space. + * + * The IP header and mutable extension headers will be moved forward to make + * space for the route optimization header. + */ +static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + struct ipv6hdr *iph; + u8 *prevhdr; + int hdr_len; + + iph = ipv6_hdr(skb); + + hdr_len = xfrm6_hdr_offset(x, skb, &prevhdr); + if (hdr_len < 0) + return hdr_len; + skb_set_mac_header(skb, + (prevhdr - x->props.header_len) - skb->data); + skb_set_network_header(skb, -x->props.header_len); + skb->transport_header = skb->network_header + hdr_len; + __skb_pull(skb, hdr_len); + memmove(ipv6_hdr(skb), iph, hdr_len); + + x->lastused = ktime_get_real_seconds(); + + return 0; +#else + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; +#endif +} + +/* Add encapsulation header. + * + * The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt. + */ +static int xfrm4_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ip_beet_phdr *ph; + struct iphdr *top_iph; + int hdrlen, optlen; + + hdrlen = 0; + optlen = XFRM_MODE_SKB_CB(skb)->optlen; + if (unlikely(optlen)) + hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4); + + skb_set_network_header(skb, -x->props.header_len - hdrlen + + (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph))); + if (x->sel.family != AF_INET6) + skb->network_header += IPV4_BEET_PHMAXLEN; + skb->mac_header = skb->network_header + + offsetof(struct iphdr, protocol); + skb->transport_header = skb->network_header + sizeof(*top_iph); + + xfrm4_beet_make_header(skb); + + ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen); + + top_iph = ip_hdr(skb); + + if (unlikely(optlen)) { + if (WARN_ON(optlen < 0)) + return -EINVAL; + + ph->padlen = 4 - (optlen & 4); + ph->hdrlen = optlen / 8; + ph->nexthdr = top_iph->protocol; + if (ph->padlen) + memset(ph + 1, IPOPT_NOP, ph->padlen); + + top_iph->protocol = IPPROTO_BEETPH; + top_iph->ihl = sizeof(struct iphdr) / 4; + } + + top_iph->saddr = x->props.saddr.a4; + top_iph->daddr = x->id.daddr.a4; + + return 0; +} + +/* Add encapsulation header. + * + * The top IP header will be constructed per RFC 2401. + */ +static int xfrm4_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb) +{ + bool small_ipv6 = (skb->protocol == htons(ETH_P_IPV6)) && (skb->len <= IPV6_MIN_MTU); + struct dst_entry *dst = skb_dst(skb); + struct iphdr *top_iph; + int flags; + + skb_set_inner_network_header(skb, skb_network_offset(skb)); + skb_set_inner_transport_header(skb, skb_transport_offset(skb)); + + skb_set_network_header(skb, -x->props.header_len); + skb->mac_header = skb->network_header + + offsetof(struct iphdr, protocol); + skb->transport_header = skb->network_header + sizeof(*top_iph); + top_iph = ip_hdr(skb); + + top_iph->ihl = 5; + top_iph->version = 4; + + top_iph->protocol = xfrm_af2proto(skb_dst(skb)->ops->family); + + /* DS disclosing depends on XFRM_SA_XFLAG_DONT_ENCAP_DSCP */ + if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) + top_iph->tos = 0; + else + top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos; + top_iph->tos = INET_ECN_encapsulate(top_iph->tos, + XFRM_MODE_SKB_CB(skb)->tos); + + flags = x->props.flags; + if (flags & XFRM_STATE_NOECN) + IP_ECN_clear(top_iph); + + top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) || small_ipv6 ? + 0 : (XFRM_MODE_SKB_CB(skb)->frag_off & htons(IP_DF)); + + top_iph->ttl = ip4_dst_hoplimit(xfrm_dst_child(dst)); + + top_iph->saddr = x->props.saddr.a4; + top_iph->daddr = x->id.daddr.a4; + ip_select_ident(dev_net(dst->dev), skb, NULL); + + return 0; +} + +#if IS_ENABLED(CONFIG_IPV6) +static int xfrm6_tunnel_encap_add(struct xfrm_state *x, struct sk_buff *skb) +{ + struct dst_entry *dst = skb_dst(skb); + struct ipv6hdr *top_iph; + int dsfield; + + skb_set_inner_network_header(skb, skb_network_offset(skb)); + skb_set_inner_transport_header(skb, skb_transport_offset(skb)); + + skb_set_network_header(skb, -x->props.header_len); + skb->mac_header = skb->network_header + + offsetof(struct ipv6hdr, nexthdr); + skb->transport_header = skb->network_header + sizeof(*top_iph); + top_iph = ipv6_hdr(skb); + + top_iph->version = 6; + + memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl, + sizeof(top_iph->flow_lbl)); + top_iph->nexthdr = xfrm_af2proto(skb_dst(skb)->ops->family); + + if (x->props.extra_flags & XFRM_SA_XFLAG_DONT_ENCAP_DSCP) + dsfield = 0; + else + dsfield = XFRM_MODE_SKB_CB(skb)->tos; + dsfield = INET_ECN_encapsulate(dsfield, XFRM_MODE_SKB_CB(skb)->tos); + if (x->props.flags & XFRM_STATE_NOECN) + dsfield &= ~INET_ECN_MASK; + ipv6_change_dsfield(top_iph, 0, dsfield); + top_iph->hop_limit = ip6_dst_hoplimit(xfrm_dst_child(dst)); + top_iph->saddr = *(struct in6_addr *)&x->props.saddr; + top_iph->daddr = *(struct in6_addr *)&x->id.daddr; + return 0; +} + +static int xfrm6_beet_encap_add(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ipv6hdr *top_iph; + struct ip_beet_phdr *ph; + int optlen, hdr_len; + + hdr_len = 0; + optlen = XFRM_MODE_SKB_CB(skb)->optlen; + if (unlikely(optlen)) + hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4); + + skb_set_network_header(skb, -x->props.header_len - hdr_len); + if (x->sel.family != AF_INET6) + skb->network_header += IPV4_BEET_PHMAXLEN; + skb->mac_header = skb->network_header + + offsetof(struct ipv6hdr, nexthdr); + skb->transport_header = skb->network_header + sizeof(*top_iph); + ph = __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdr_len); + + xfrm6_beet_make_header(skb); + + top_iph = ipv6_hdr(skb); + if (unlikely(optlen)) { + if (WARN_ON(optlen < 0)) + return -EINVAL; + + ph->padlen = 4 - (optlen & 4); + ph->hdrlen = optlen / 8; + ph->nexthdr = top_iph->nexthdr; + if (ph->padlen) + memset(ph + 1, IPOPT_NOP, ph->padlen); + + top_iph->nexthdr = IPPROTO_BEETPH; + } + + top_iph->saddr = *(struct in6_addr *)&x->props.saddr; + top_iph->daddr = *(struct in6_addr *)&x->id.daddr; + return 0; +} +#endif + +/* Add encapsulation header. + * + * On exit, the transport header will be set to the start of the + * encapsulation header to be filled in by x->type->output and the mac + * header will be set to the nextheader (protocol for IPv4) field of the + * extension header directly preceding the encapsulation header, or in + * its absence, that of the top IP header. + * The value of the network header will always point to the top IP header + * while skb->data will point to the payload. + */ +static int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb) +{ + int err; + + err = xfrm_inner_extract_output(x, skb); + if (err) + return err; + + IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE; + skb->protocol = htons(ETH_P_IP); + + switch (x->outer_mode.encap) { + case XFRM_MODE_BEET: + return xfrm4_beet_encap_add(x, skb); + case XFRM_MODE_TUNNEL: + return xfrm4_tunnel_encap_add(x, skb); + } + + WARN_ON_ONCE(1); + return -EOPNOTSUPP; +} + +static int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + int err; + + err = xfrm_inner_extract_output(x, skb); + if (err) + return err; + + skb->ignore_df = 1; + skb->protocol = htons(ETH_P_IPV6); + + switch (x->outer_mode.encap) { + case XFRM_MODE_BEET: + return xfrm6_beet_encap_add(x, skb); + case XFRM_MODE_TUNNEL: + return xfrm6_tunnel_encap_add(x, skb); + default: + WARN_ON_ONCE(1); + return -EOPNOTSUPP; + } +#endif + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; +} + +static int xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb) +{ + switch (x->outer_mode.encap) { + case XFRM_MODE_BEET: + case XFRM_MODE_TUNNEL: + if (x->outer_mode.family == AF_INET) + return xfrm4_prepare_output(x, skb); + if (x->outer_mode.family == AF_INET6) + return xfrm6_prepare_output(x, skb); + break; + case XFRM_MODE_TRANSPORT: + if (x->outer_mode.family == AF_INET) + return xfrm4_transport_output(x, skb); + if (x->outer_mode.family == AF_INET6) + return xfrm6_transport_output(x, skb); + break; + case XFRM_MODE_ROUTEOPTIMIZATION: + if (x->outer_mode.family == AF_INET6) + return xfrm6_ro_output(x, skb); + WARN_ON_ONCE(1); + break; + default: + WARN_ON_ONCE(1); + break; + } + + return -EOPNOTSUPP; +} + +#if IS_ENABLED(CONFIG_NET_PKTGEN) +int pktgen_xfrm_outer_mode_output(struct xfrm_state *x, struct sk_buff *skb) +{ + return xfrm_outer_mode_output(x, skb); +} +EXPORT_SYMBOL_GPL(pktgen_xfrm_outer_mode_output); +#endif + +static int xfrm_output_one(struct sk_buff *skb, int err) +{ + struct dst_entry *dst = skb_dst(skb); + struct xfrm_state *x = dst->xfrm; + struct net *net = xs_net(x); + + if (err <= 0) + goto resume; + + do { + err = xfrm_skb_check_space(skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + goto error_nolock; + } + + skb->mark = xfrm_smark_get(skb->mark, x); + + err = xfrm_outer_mode_output(x, skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); + goto error_nolock; + } + + spin_lock_bh(&x->lock); + + if (unlikely(x->km.state != XFRM_STATE_VALID)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID); + err = -EINVAL; + goto error; + } + + err = xfrm_state_check_expire(x); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED); + goto error; + } + + err = xfrm_replay_overflow(x, skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR); + goto error; + } + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock_bh(&x->lock); + + skb_dst_force(skb); + if (!skb_dst(skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + err = -EHOSTUNREACH; + goto error_nolock; + } + + if (xfrm_offload(skb)) { + x->type_offload->encap(x, skb); + } else { + /* Inner headers are invalid now. */ + skb->encapsulation = 0; + + err = x->type->output(x, skb); + if (err == -EINPROGRESS) + goto out; + } + +resume: + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); + goto error_nolock; + } + + dst = skb_dst_pop(skb); + if (!dst) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + err = -EHOSTUNREACH; + goto error_nolock; + } + skb_dst_set(skb, dst); + x = dst->xfrm; + } while (x && !(x->outer_mode.flags & XFRM_MODE_FLAG_TUNNEL)); + + return 0; + +error: + spin_unlock_bh(&x->lock); +error_nolock: + kfree_skb(skb); +out: + return err; +} + +int xfrm_output_resume(struct sock *sk, struct sk_buff *skb, int err) +{ + struct net *net = xs_net(skb_dst(skb)->xfrm); + + while (likely((err = xfrm_output_one(skb, err)) == 0)) { + nf_reset_ct(skb); + + err = skb_dst(skb)->ops->local_out(net, sk, skb); + if (unlikely(err != 1)) + goto out; + + if (!skb_dst(skb)->xfrm) + return dst_output(net, sk, skb); + + err = nf_hook(skb_dst(skb)->ops->family, + NF_INET_POST_ROUTING, net, sk, skb, + NULL, skb_dst(skb)->dev, xfrm_output2); + if (unlikely(err != 1)) + goto out; + } + + if (err == -EINPROGRESS) + err = 0; + +out: + return err; +} +EXPORT_SYMBOL_GPL(xfrm_output_resume); + +static int xfrm_output2(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + return xfrm_output_resume(sk, skb, 1); +} + +static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + struct sk_buff *segs, *nskb; + + BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_GSO_CB_OFFSET); + BUILD_BUG_ON(sizeof(*IP6CB(skb)) > SKB_GSO_CB_OFFSET); + segs = skb_gso_segment(skb, 0); + kfree_skb(skb); + if (IS_ERR(segs)) + return PTR_ERR(segs); + if (segs == NULL) + return -EINVAL; + + skb_list_walk_safe(segs, segs, nskb) { + int err; + + skb_mark_not_on_list(segs); + err = xfrm_output2(net, sk, segs); + + if (unlikely(err)) { + kfree_skb_list(nskb); + return err; + } + } + + return 0; +} + +/* For partial checksum offload, the outer header checksum is calculated + * by software and the inner header checksum is calculated by hardware. + * This requires hardware to know the inner packet type to calculate + * the inner header checksum. Save inner ip protocol here to avoid + * traversing the packet in the vendor's xmit code. + * For IPsec tunnel mode save the ip protocol from the IP header of the + * plain text packet. Otherwise If the encap type is IPIP, just save + * skb->inner_ipproto in any other case get the ip protocol from the IP + * header. + */ +static void xfrm_get_inner_ipproto(struct sk_buff *skb, struct xfrm_state *x) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + const struct ethhdr *eth; + + if (!xo) + return; + + if (x->outer_mode.encap == XFRM_MODE_TUNNEL) { + switch (x->outer_mode.family) { + case AF_INET: + xo->inner_ipproto = ip_hdr(skb)->protocol; + break; + case AF_INET6: + xo->inner_ipproto = ipv6_hdr(skb)->nexthdr; + break; + default: + break; + } + + return; + } + + /* non-Tunnel Mode */ + if (!skb->encapsulation) + return; + + if (skb->inner_protocol_type == ENCAP_TYPE_IPPROTO) { + xo->inner_ipproto = skb->inner_ipproto; + return; + } + + if (skb->inner_protocol_type != ENCAP_TYPE_ETHER) + return; + + eth = (struct ethhdr *)skb_inner_mac_header(skb); + + switch (ntohs(eth->h_proto)) { + case ETH_P_IPV6: + xo->inner_ipproto = inner_ipv6_hdr(skb)->nexthdr; + break; + case ETH_P_IP: + xo->inner_ipproto = inner_ip_hdr(skb)->protocol; + break; + } +} + +int xfrm_output(struct sock *sk, struct sk_buff *skb) +{ + struct net *net = dev_net(skb_dst(skb)->dev); + struct xfrm_state *x = skb_dst(skb)->xfrm; + int err; + + switch (x->outer_mode.family) { + case AF_INET: + memset(IPCB(skb), 0, sizeof(*IPCB(skb))); + IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED; + break; + case AF_INET6: + memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); + + IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; + break; + } + + secpath_reset(skb); + + if (xfrm_dev_offload_ok(skb, x)) { + struct sec_path *sp; + + sp = secpath_set(skb); + if (!sp) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + kfree_skb(skb); + return -ENOMEM; + } + + sp->olen++; + sp->xvec[sp->len++] = x; + xfrm_state_hold(x); + + xfrm_get_inner_ipproto(skb, x); + skb->encapsulation = 1; + + if (skb_is_gso(skb)) { + if (skb->inner_protocol) + return xfrm_output_gso(net, sk, skb); + + skb_shinfo(skb)->gso_type |= SKB_GSO_ESP; + goto out; + } + + if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM) + goto out; + } else { + if (skb_is_gso(skb)) + return xfrm_output_gso(net, sk, skb); + } + + if (skb->ip_summed == CHECKSUM_PARTIAL) { + err = skb_checksum_help(skb); + if (err) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + kfree_skb(skb); + return err; + } + } + +out: + return xfrm_output2(net, sk, skb); +} +EXPORT_SYMBOL_GPL(xfrm_output); + +static int xfrm4_tunnel_check_size(struct sk_buff *skb) +{ + int mtu, ret = 0; + + if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE) + goto out; + + if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->ignore_df) + goto out; + + mtu = dst_mtu(skb_dst(skb)); + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && + !skb_gso_validate_network_len(skb, ip_skb_dst_mtu(skb->sk, skb)))) { + skb->protocol = htons(ETH_P_IP); + + if (skb->sk) + xfrm_local_error(skb, mtu); + else + icmp_send(skb, ICMP_DEST_UNREACH, + ICMP_FRAG_NEEDED, htonl(mtu)); + ret = -EMSGSIZE; + } +out: + return ret; +} + +static int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb) +{ + int err; + + if (x->outer_mode.encap == XFRM_MODE_BEET && + ip_is_fragment(ip_hdr(skb))) { + net_warn_ratelimited("BEET mode doesn't support inner IPv4 fragments\n"); + return -EAFNOSUPPORT; + } + + err = xfrm4_tunnel_check_size(skb); + if (err) + return err; + + XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol; + + xfrm4_extract_header(skb); + return 0; +} + +#if IS_ENABLED(CONFIG_IPV6) +static int xfrm6_tunnel_check_size(struct sk_buff *skb) +{ + int mtu, ret = 0; + struct dst_entry *dst = skb_dst(skb); + + if (skb->ignore_df) + goto out; + + mtu = dst_mtu(dst); + if (mtu < IPV6_MIN_MTU) + mtu = IPV6_MIN_MTU; + + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && + !skb_gso_validate_network_len(skb, ip6_skb_dst_mtu(skb)))) { + skb->dev = dst->dev; + skb->protocol = htons(ETH_P_IPV6); + + if (xfrm6_local_dontfrag(skb->sk)) + ipv6_stub->xfrm6_local_rxpmtu(skb, mtu); + else if (skb->sk) + xfrm_local_error(skb, mtu); + else + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); + ret = -EMSGSIZE; + } +out: + return ret; +} +#endif + +static int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb) +{ +#if IS_ENABLED(CONFIG_IPV6) + int err; + + err = xfrm6_tunnel_check_size(skb); + if (err) + return err; + + XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr; + + xfrm6_extract_header(skb); + return 0; +#else + WARN_ON_ONCE(1); + return -EAFNOSUPPORT; +#endif +} + +static int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) +{ + const struct xfrm_mode *inner_mode; + + if (x->sel.family == AF_UNSPEC) + inner_mode = xfrm_ip2inner_mode(x, + xfrm_af2proto(skb_dst(skb)->ops->family)); + else + inner_mode = &x->inner_mode; + + if (inner_mode == NULL) + return -EAFNOSUPPORT; + + switch (inner_mode->family) { + case AF_INET: + return xfrm4_extract_output(x, skb); + case AF_INET6: + return xfrm6_extract_output(x, skb); + } + + return -EAFNOSUPPORT; +} + +void xfrm_local_error(struct sk_buff *skb, int mtu) +{ + unsigned int proto; + struct xfrm_state_afinfo *afinfo; + + if (skb->protocol == htons(ETH_P_IP)) + proto = AF_INET; + else if (skb->protocol == htons(ETH_P_IPV6) && + skb->sk->sk_family == AF_INET6) + proto = AF_INET6; + else + return; + + afinfo = xfrm_state_get_afinfo(proto); + if (afinfo) { + afinfo->local_error(skb, mtu); + rcu_read_unlock(); + } +} +EXPORT_SYMBOL_GPL(xfrm_local_error); diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c new file mode 100644 index 000000000..e47c670c7 --- /dev/null +++ b/net/xfrm/xfrm_policy.c @@ -0,0 +1,4490 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * xfrm_policy.c + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * Kazunori MIYAZAWA @USAGI + * YOSHIFUJI Hideaki + * Split up af-specific portion + * Derek Atkins Add the post_input processor + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if IS_ENABLED(CONFIG_IPV6_MIP6) +#include +#endif +#ifdef CONFIG_XFRM_STATISTICS +#include +#endif +#ifdef CONFIG_XFRM_ESPINTCP +#include +#endif + +#include "xfrm_hash.h" + +#define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10)) +#define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ)) +#define XFRM_MAX_QUEUE_LEN 100 + +struct xfrm_flo { + struct dst_entry *dst_orig; + u8 flags; +}; + +/* prefixes smaller than this are stored in lists, not trees. */ +#define INEXACT_PREFIXLEN_IPV4 16 +#define INEXACT_PREFIXLEN_IPV6 48 + +struct xfrm_pol_inexact_node { + struct rb_node node; + union { + xfrm_address_t addr; + struct rcu_head rcu; + }; + u8 prefixlen; + + struct rb_root root; + + /* the policies matching this node, can be empty list */ + struct hlist_head hhead; +}; + +/* xfrm inexact policy search tree: + * xfrm_pol_inexact_bin = hash(dir,type,family,if_id); + * | + * +---- root_d: sorted by daddr:prefix + * | | + * | xfrm_pol_inexact_node + * | | + * | +- root: sorted by saddr/prefix + * | | | + * | | xfrm_pol_inexact_node + * | | | + * | | + root: unused + * | | | + * | | + hhead: saddr:daddr policies + * | | + * | +- coarse policies and all any:daddr policies + * | + * +---- root_s: sorted by saddr:prefix + * | | + * | xfrm_pol_inexact_node + * | | + * | + root: unused + * | | + * | + hhead: saddr:any policies + * | + * +---- coarse policies and all any:any policies + * + * Lookups return four candidate lists: + * 1. any:any list from top-level xfrm_pol_inexact_bin + * 2. any:daddr list from daddr tree + * 3. saddr:daddr list from 2nd level daddr tree + * 4. saddr:any list from saddr tree + * + * This result set then needs to be searched for the policy with + * the lowest priority. If two results have same prio, youngest one wins. + */ + +struct xfrm_pol_inexact_key { + possible_net_t net; + u32 if_id; + u16 family; + u8 dir, type; +}; + +struct xfrm_pol_inexact_bin { + struct xfrm_pol_inexact_key k; + struct rhash_head head; + /* list containing '*:*' policies */ + struct hlist_head hhead; + + seqcount_spinlock_t count; + /* tree sorted by daddr/prefix */ + struct rb_root root_d; + + /* tree sorted by saddr/prefix */ + struct rb_root root_s; + + /* slow path below */ + struct list_head inexact_bins; + struct rcu_head rcu; +}; + +enum xfrm_pol_inexact_candidate_type { + XFRM_POL_CAND_BOTH, + XFRM_POL_CAND_SADDR, + XFRM_POL_CAND_DADDR, + XFRM_POL_CAND_ANY, + + XFRM_POL_CAND_MAX, +}; + +struct xfrm_pol_inexact_candidates { + struct hlist_head *res[XFRM_POL_CAND_MAX]; +}; + +static DEFINE_SPINLOCK(xfrm_if_cb_lock); +static struct xfrm_if_cb const __rcu *xfrm_if_cb __read_mostly; + +static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock); +static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1] + __read_mostly; + +static struct kmem_cache *xfrm_dst_cache __ro_after_init; + +static struct rhashtable xfrm_policy_inexact_table; +static const struct rhashtable_params xfrm_pol_inexact_params; + +static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr); +static int stale_bundle(struct dst_entry *dst); +static int xfrm_bundle_ok(struct xfrm_dst *xdst); +static void xfrm_policy_queue_process(struct timer_list *t); + +static void __xfrm_policy_link(struct xfrm_policy *pol, int dir); +static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, + int dir); + +static struct xfrm_pol_inexact_bin * +xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family, u8 dir, + u32 if_id); + +static struct xfrm_pol_inexact_bin * +xfrm_policy_inexact_lookup_rcu(struct net *net, + u8 type, u16 family, u8 dir, u32 if_id); +static struct xfrm_policy * +xfrm_policy_insert_list(struct hlist_head *chain, struct xfrm_policy *policy, + bool excl); +static void xfrm_policy_insert_inexact_list(struct hlist_head *chain, + struct xfrm_policy *policy); + +static bool +xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand, + struct xfrm_pol_inexact_bin *b, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr); + +static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy) +{ + return refcount_inc_not_zero(&policy->refcnt); +} + +static inline bool +__xfrm4_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi4 *fl4 = &fl->u.ip4; + + return addr4_match(fl4->daddr, sel->daddr.a4, sel->prefixlen_d) && + addr4_match(fl4->saddr, sel->saddr.a4, sel->prefixlen_s) && + !((xfrm_flowi_dport(fl, &fl4->uli) ^ sel->dport) & sel->dport_mask) && + !((xfrm_flowi_sport(fl, &fl4->uli) ^ sel->sport) & sel->sport_mask) && + (fl4->flowi4_proto == sel->proto || !sel->proto) && + (fl4->flowi4_oif == sel->ifindex || !sel->ifindex); +} + +static inline bool +__xfrm6_selector_match(const struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi6 *fl6 = &fl->u.ip6; + + return addr_match(&fl6->daddr, &sel->daddr, sel->prefixlen_d) && + addr_match(&fl6->saddr, &sel->saddr, sel->prefixlen_s) && + !((xfrm_flowi_dport(fl, &fl6->uli) ^ sel->dport) & sel->dport_mask) && + !((xfrm_flowi_sport(fl, &fl6->uli) ^ sel->sport) & sel->sport_mask) && + (fl6->flowi6_proto == sel->proto || !sel->proto) && + (fl6->flowi6_oif == sel->ifindex || !sel->ifindex); +} + +bool xfrm_selector_match(const struct xfrm_selector *sel, const struct flowi *fl, + unsigned short family) +{ + switch (family) { + case AF_INET: + return __xfrm4_selector_match(sel, fl); + case AF_INET6: + return __xfrm6_selector_match(sel, fl); + } + return false; +} + +static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family) +{ + const struct xfrm_policy_afinfo *afinfo; + + if (unlikely(family >= ARRAY_SIZE(xfrm_policy_afinfo))) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_policy_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +/* Called with rcu_read_lock(). */ +static const struct xfrm_if_cb *xfrm_if_get_cb(void) +{ + return rcu_dereference(xfrm_if_cb); +} + +struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + int family, u32 mark) +{ + const struct xfrm_policy_afinfo *afinfo; + struct dst_entry *dst; + + afinfo = xfrm_policy_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return ERR_PTR(-EAFNOSUPPORT); + + dst = afinfo->dst_lookup(net, tos, oif, saddr, daddr, mark); + + rcu_read_unlock(); + + return dst; +} +EXPORT_SYMBOL(__xfrm_dst_lookup); + +static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, + int tos, int oif, + xfrm_address_t *prev_saddr, + xfrm_address_t *prev_daddr, + int family, u32 mark) +{ + struct net *net = xs_net(x); + xfrm_address_t *saddr = &x->props.saddr; + xfrm_address_t *daddr = &x->id.daddr; + struct dst_entry *dst; + + if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) { + saddr = x->coaddr; + daddr = prev_daddr; + } + if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) { + saddr = prev_saddr; + daddr = x->coaddr; + } + + dst = __xfrm_dst_lookup(net, tos, oif, saddr, daddr, family, mark); + + if (!IS_ERR(dst)) { + if (prev_saddr != saddr) + memcpy(prev_saddr, saddr, sizeof(*prev_saddr)); + if (prev_daddr != daddr) + memcpy(prev_daddr, daddr, sizeof(*prev_daddr)); + } + + return dst; +} + +static inline unsigned long make_jiffies(long secs) +{ + if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) + return MAX_SCHEDULE_TIMEOUT-1; + else + return secs*HZ; +} + +static void xfrm_policy_timer(struct timer_list *t) +{ + struct xfrm_policy *xp = from_timer(xp, t, timer); + time64_t now = ktime_get_real_seconds(); + time64_t next = TIME64_MAX; + int warn = 0; + int dir; + + read_lock(&xp->lock); + + if (unlikely(xp->walk.dead)) + goto out; + + dir = xfrm_policy_id2dir(xp->index); + + if (xp->lft.hard_add_expires_seconds) { + time64_t tmo = xp->lft.hard_add_expires_seconds + + xp->curlft.add_time - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (xp->lft.hard_use_expires_seconds) { + time64_t tmo = xp->lft.hard_use_expires_seconds + + (READ_ONCE(xp->curlft.use_time) ? : xp->curlft.add_time) - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (xp->lft.soft_add_expires_seconds) { + time64_t tmo = xp->lft.soft_add_expires_seconds + + xp->curlft.add_time - now; + if (tmo <= 0) { + warn = 1; + tmo = XFRM_KM_TIMEOUT; + } + if (tmo < next) + next = tmo; + } + if (xp->lft.soft_use_expires_seconds) { + time64_t tmo = xp->lft.soft_use_expires_seconds + + (READ_ONCE(xp->curlft.use_time) ? : xp->curlft.add_time) - now; + if (tmo <= 0) { + warn = 1; + tmo = XFRM_KM_TIMEOUT; + } + if (tmo < next) + next = tmo; + } + + if (warn) + km_policy_expired(xp, dir, 0, 0); + if (next != TIME64_MAX && + !mod_timer(&xp->timer, jiffies + make_jiffies(next))) + xfrm_pol_hold(xp); + +out: + read_unlock(&xp->lock); + xfrm_pol_put(xp); + return; + +expired: + read_unlock(&xp->lock); + if (!xfrm_policy_delete(xp, dir)) + km_policy_expired(xp, dir, 1, 0); + xfrm_pol_put(xp); +} + +/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2 + * SPD calls. + */ + +struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) +{ + struct xfrm_policy *policy; + + policy = kzalloc(sizeof(struct xfrm_policy), gfp); + + if (policy) { + write_pnet(&policy->xp_net, net); + INIT_LIST_HEAD(&policy->walk.all); + INIT_HLIST_NODE(&policy->bydst_inexact_list); + INIT_HLIST_NODE(&policy->bydst); + INIT_HLIST_NODE(&policy->byidx); + rwlock_init(&policy->lock); + refcount_set(&policy->refcnt, 1); + skb_queue_head_init(&policy->polq.hold_queue); + timer_setup(&policy->timer, xfrm_policy_timer, 0); + timer_setup(&policy->polq.hold_timer, + xfrm_policy_queue_process, 0); + } + return policy; +} +EXPORT_SYMBOL(xfrm_policy_alloc); + +static void xfrm_policy_destroy_rcu(struct rcu_head *head) +{ + struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu); + + security_xfrm_policy_free(policy->security); + kfree(policy); +} + +/* Destroy xfrm_policy: descendant resources must be released to this moment. */ + +void xfrm_policy_destroy(struct xfrm_policy *policy) +{ + BUG_ON(!policy->walk.dead); + + if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) + BUG(); + + call_rcu(&policy->rcu, xfrm_policy_destroy_rcu); +} +EXPORT_SYMBOL(xfrm_policy_destroy); + +/* Rule must be locked. Release descendant resources, announce + * entry dead. The rule must be unlinked from lists to the moment. + */ + +static void xfrm_policy_kill(struct xfrm_policy *policy) +{ + write_lock_bh(&policy->lock); + policy->walk.dead = 1; + write_unlock_bh(&policy->lock); + + atomic_inc(&policy->genid); + + if (del_timer(&policy->polq.hold_timer)) + xfrm_pol_put(policy); + skb_queue_purge(&policy->polq.hold_queue); + + if (del_timer(&policy->timer)) + xfrm_pol_put(policy); + + xfrm_pol_put(policy); +} + +static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024; + +static inline unsigned int idx_hash(struct net *net, u32 index) +{ + return __idx_hash(index, net->xfrm.policy_idx_hmask); +} + +/* calculate policy hash thresholds */ +static void __get_hash_thresh(struct net *net, + unsigned short family, int dir, + u8 *dbits, u8 *sbits) +{ + switch (family) { + case AF_INET: + *dbits = net->xfrm.policy_bydst[dir].dbits4; + *sbits = net->xfrm.policy_bydst[dir].sbits4; + break; + + case AF_INET6: + *dbits = net->xfrm.policy_bydst[dir].dbits6; + *sbits = net->xfrm.policy_bydst[dir].sbits6; + break; + + default: + *dbits = 0; + *sbits = 0; + } +} + +static struct hlist_head *policy_hash_bysel(struct net *net, + const struct xfrm_selector *sel, + unsigned short family, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int hash; + u8 dbits; + u8 sbits; + + __get_hash_thresh(net, family, dir, &dbits, &sbits); + hash = __sel_hash(sel, family, hmask, dbits, sbits); + + if (hash == hmask + 1) + return NULL; + + return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, + lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; +} + +static struct hlist_head *policy_hash_direct(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int hash; + u8 dbits; + u8 sbits; + + __get_hash_thresh(net, family, dir, &dbits, &sbits); + hash = __addr_hash(daddr, saddr, family, hmask, dbits, sbits); + + return rcu_dereference_check(net->xfrm.policy_bydst[dir].table, + lockdep_is_held(&net->xfrm.xfrm_policy_lock)) + hash; +} + +static void xfrm_dst_hash_transfer(struct net *net, + struct hlist_head *list, + struct hlist_head *ndsttable, + unsigned int nhashmask, + int dir) +{ + struct hlist_node *tmp, *entry0 = NULL; + struct xfrm_policy *pol; + unsigned int h0 = 0; + u8 dbits; + u8 sbits; + +redo: + hlist_for_each_entry_safe(pol, tmp, list, bydst) { + unsigned int h; + + __get_hash_thresh(net, pol->family, dir, &dbits, &sbits); + h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr, + pol->family, nhashmask, dbits, sbits); + if (!entry0) { + hlist_del_rcu(&pol->bydst); + hlist_add_head_rcu(&pol->bydst, ndsttable + h); + h0 = h; + } else { + if (h != h0) + continue; + hlist_del_rcu(&pol->bydst); + hlist_add_behind_rcu(&pol->bydst, entry0); + } + entry0 = &pol->bydst; + } + if (!hlist_empty(list)) { + entry0 = NULL; + goto redo; + } +} + +static void xfrm_idx_hash_transfer(struct hlist_head *list, + struct hlist_head *nidxtable, + unsigned int nhashmask) +{ + struct hlist_node *tmp; + struct xfrm_policy *pol; + + hlist_for_each_entry_safe(pol, tmp, list, byidx) { + unsigned int h; + + h = __idx_hash(pol->index, nhashmask); + hlist_add_head(&pol->byidx, nidxtable+h); + } +} + +static unsigned long xfrm_new_hash_mask(unsigned int old_hmask) +{ + return ((old_hmask + 1) << 1) - 1; +} + +static void xfrm_bydst_resize(struct net *net, int dir) +{ + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + unsigned int nhashmask = xfrm_new_hash_mask(hmask); + unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); + struct hlist_head *ndst = xfrm_hash_alloc(nsize); + struct hlist_head *odst; + int i; + + if (!ndst) + return; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation); + + odst = rcu_dereference_protected(net->xfrm.policy_bydst[dir].table, + lockdep_is_held(&net->xfrm.xfrm_policy_lock)); + + for (i = hmask; i >= 0; i--) + xfrm_dst_hash_transfer(net, odst + i, ndst, nhashmask, dir); + + rcu_assign_pointer(net->xfrm.policy_bydst[dir].table, ndst); + net->xfrm.policy_bydst[dir].hmask = nhashmask; + + write_seqcount_end(&net->xfrm.xfrm_policy_hash_generation); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + synchronize_rcu(); + + xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head)); +} + +static void xfrm_byidx_resize(struct net *net, int total) +{ + unsigned int hmask = net->xfrm.policy_idx_hmask; + unsigned int nhashmask = xfrm_new_hash_mask(hmask); + unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head); + struct hlist_head *oidx = net->xfrm.policy_byidx; + struct hlist_head *nidx = xfrm_hash_alloc(nsize); + int i; + + if (!nidx) + return; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + + for (i = hmask; i >= 0; i--) + xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask); + + net->xfrm.policy_byidx = nidx; + net->xfrm.policy_idx_hmask = nhashmask; + + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head)); +} + +static inline int xfrm_bydst_should_resize(struct net *net, int dir, int *total) +{ + unsigned int cnt = net->xfrm.policy_count[dir]; + unsigned int hmask = net->xfrm.policy_bydst[dir].hmask; + + if (total) + *total += cnt; + + if ((hmask + 1) < xfrm_policy_hashmax && + cnt > hmask) + return 1; + + return 0; +} + +static inline int xfrm_byidx_should_resize(struct net *net, int total) +{ + unsigned int hmask = net->xfrm.policy_idx_hmask; + + if ((hmask + 1) < xfrm_policy_hashmax && + total > hmask) + return 1; + + return 0; +} + +void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si) +{ + si->incnt = net->xfrm.policy_count[XFRM_POLICY_IN]; + si->outcnt = net->xfrm.policy_count[XFRM_POLICY_OUT]; + si->fwdcnt = net->xfrm.policy_count[XFRM_POLICY_FWD]; + si->inscnt = net->xfrm.policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX]; + si->outscnt = net->xfrm.policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX]; + si->fwdscnt = net->xfrm.policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX]; + si->spdhcnt = net->xfrm.policy_idx_hmask; + si->spdhmcnt = xfrm_policy_hashmax; +} +EXPORT_SYMBOL(xfrm_spd_getinfo); + +static DEFINE_MUTEX(hash_resize_mutex); +static void xfrm_hash_resize(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.policy_hash_work); + int dir, total; + + mutex_lock(&hash_resize_mutex); + + total = 0; + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + if (xfrm_bydst_should_resize(net, dir, &total)) + xfrm_bydst_resize(net, dir); + } + if (xfrm_byidx_should_resize(net, total)) + xfrm_byidx_resize(net, total); + + mutex_unlock(&hash_resize_mutex); +} + +/* Make sure *pol can be inserted into fastbin. + * Useful to check that later insert requests will be successful + * (provided xfrm_policy_lock is held throughout). + */ +static struct xfrm_pol_inexact_bin * +xfrm_policy_inexact_alloc_bin(const struct xfrm_policy *pol, u8 dir) +{ + struct xfrm_pol_inexact_bin *bin, *prev; + struct xfrm_pol_inexact_key k = { + .family = pol->family, + .type = pol->type, + .dir = dir, + .if_id = pol->if_id, + }; + struct net *net = xp_net(pol); + + lockdep_assert_held(&net->xfrm.xfrm_policy_lock); + + write_pnet(&k.net, net); + bin = rhashtable_lookup_fast(&xfrm_policy_inexact_table, &k, + xfrm_pol_inexact_params); + if (bin) + return bin; + + bin = kzalloc(sizeof(*bin), GFP_ATOMIC); + if (!bin) + return NULL; + + bin->k = k; + INIT_HLIST_HEAD(&bin->hhead); + bin->root_d = RB_ROOT; + bin->root_s = RB_ROOT; + seqcount_spinlock_init(&bin->count, &net->xfrm.xfrm_policy_lock); + + prev = rhashtable_lookup_get_insert_key(&xfrm_policy_inexact_table, + &bin->k, &bin->head, + xfrm_pol_inexact_params); + if (!prev) { + list_add(&bin->inexact_bins, &net->xfrm.inexact_bins); + return bin; + } + + kfree(bin); + + return IS_ERR(prev) ? NULL : prev; +} + +static bool xfrm_pol_inexact_addr_use_any_list(const xfrm_address_t *addr, + int family, u8 prefixlen) +{ + if (xfrm_addr_any(addr, family)) + return true; + + if (family == AF_INET6 && prefixlen < INEXACT_PREFIXLEN_IPV6) + return true; + + if (family == AF_INET && prefixlen < INEXACT_PREFIXLEN_IPV4) + return true; + + return false; +} + +static bool +xfrm_policy_inexact_insert_use_any_list(const struct xfrm_policy *policy) +{ + const xfrm_address_t *addr; + bool saddr_any, daddr_any; + u8 prefixlen; + + addr = &policy->selector.saddr; + prefixlen = policy->selector.prefixlen_s; + + saddr_any = xfrm_pol_inexact_addr_use_any_list(addr, + policy->family, + prefixlen); + addr = &policy->selector.daddr; + prefixlen = policy->selector.prefixlen_d; + daddr_any = xfrm_pol_inexact_addr_use_any_list(addr, + policy->family, + prefixlen); + return saddr_any && daddr_any; +} + +static void xfrm_pol_inexact_node_init(struct xfrm_pol_inexact_node *node, + const xfrm_address_t *addr, u8 prefixlen) +{ + node->addr = *addr; + node->prefixlen = prefixlen; +} + +static struct xfrm_pol_inexact_node * +xfrm_pol_inexact_node_alloc(const xfrm_address_t *addr, u8 prefixlen) +{ + struct xfrm_pol_inexact_node *node; + + node = kzalloc(sizeof(*node), GFP_ATOMIC); + if (node) + xfrm_pol_inexact_node_init(node, addr, prefixlen); + + return node; +} + +static int xfrm_policy_addr_delta(const xfrm_address_t *a, + const xfrm_address_t *b, + u8 prefixlen, u16 family) +{ + u32 ma, mb, mask; + unsigned int pdw, pbi; + int delta = 0; + + switch (family) { + case AF_INET: + if (prefixlen == 0) + return 0; + mask = ~0U << (32 - prefixlen); + ma = ntohl(a->a4) & mask; + mb = ntohl(b->a4) & mask; + if (ma < mb) + delta = -1; + else if (ma > mb) + delta = 1; + break; + case AF_INET6: + pdw = prefixlen >> 5; + pbi = prefixlen & 0x1f; + + if (pdw) { + delta = memcmp(a->a6, b->a6, pdw << 2); + if (delta) + return delta; + } + if (pbi) { + mask = ~0U << (32 - pbi); + ma = ntohl(a->a6[pdw]) & mask; + mb = ntohl(b->a6[pdw]) & mask; + if (ma < mb) + delta = -1; + else if (ma > mb) + delta = 1; + } + break; + default: + break; + } + + return delta; +} + +static void xfrm_policy_inexact_list_reinsert(struct net *net, + struct xfrm_pol_inexact_node *n, + u16 family) +{ + unsigned int matched_s, matched_d; + struct xfrm_policy *policy, *p; + + matched_s = 0; + matched_d = 0; + + list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { + struct hlist_node *newpos = NULL; + bool matches_s, matches_d; + + if (policy->walk.dead || !policy->bydst_reinsert) + continue; + + WARN_ON_ONCE(policy->family != family); + + policy->bydst_reinsert = false; + hlist_for_each_entry(p, &n->hhead, bydst) { + if (policy->priority > p->priority) + newpos = &p->bydst; + else if (policy->priority == p->priority && + policy->pos > p->pos) + newpos = &p->bydst; + else + break; + } + + if (newpos) + hlist_add_behind_rcu(&policy->bydst, newpos); + else + hlist_add_head_rcu(&policy->bydst, &n->hhead); + + /* paranoia checks follow. + * Check that the reinserted policy matches at least + * saddr or daddr for current node prefix. + * + * Matching both is fine, matching saddr in one policy + * (but not daddr) and then matching only daddr in another + * is a bug. + */ + matches_s = xfrm_policy_addr_delta(&policy->selector.saddr, + &n->addr, + n->prefixlen, + family) == 0; + matches_d = xfrm_policy_addr_delta(&policy->selector.daddr, + &n->addr, + n->prefixlen, + family) == 0; + if (matches_s && matches_d) + continue; + + WARN_ON_ONCE(!matches_s && !matches_d); + if (matches_s) + matched_s++; + if (matches_d) + matched_d++; + WARN_ON_ONCE(matched_s && matched_d); + } +} + +static void xfrm_policy_inexact_node_reinsert(struct net *net, + struct xfrm_pol_inexact_node *n, + struct rb_root *new, + u16 family) +{ + struct xfrm_pol_inexact_node *node; + struct rb_node **p, *parent; + + /* we should not have another subtree here */ + WARN_ON_ONCE(!RB_EMPTY_ROOT(&n->root)); +restart: + parent = NULL; + p = &new->rb_node; + while (*p) { + u8 prefixlen; + int delta; + + parent = *p; + node = rb_entry(*p, struct xfrm_pol_inexact_node, node); + + prefixlen = min(node->prefixlen, n->prefixlen); + + delta = xfrm_policy_addr_delta(&n->addr, &node->addr, + prefixlen, family); + if (delta < 0) { + p = &parent->rb_left; + } else if (delta > 0) { + p = &parent->rb_right; + } else { + bool same_prefixlen = node->prefixlen == n->prefixlen; + struct xfrm_policy *tmp; + + hlist_for_each_entry(tmp, &n->hhead, bydst) { + tmp->bydst_reinsert = true; + hlist_del_rcu(&tmp->bydst); + } + + node->prefixlen = prefixlen; + + xfrm_policy_inexact_list_reinsert(net, node, family); + + if (same_prefixlen) { + kfree_rcu(n, rcu); + return; + } + + rb_erase(*p, new); + kfree_rcu(n, rcu); + n = node; + goto restart; + } + } + + rb_link_node_rcu(&n->node, parent, p); + rb_insert_color(&n->node, new); +} + +/* merge nodes v and n */ +static void xfrm_policy_inexact_node_merge(struct net *net, + struct xfrm_pol_inexact_node *v, + struct xfrm_pol_inexact_node *n, + u16 family) +{ + struct xfrm_pol_inexact_node *node; + struct xfrm_policy *tmp; + struct rb_node *rnode; + + /* To-be-merged node v has a subtree. + * + * Dismantle it and insert its nodes to n->root. + */ + while ((rnode = rb_first(&v->root)) != NULL) { + node = rb_entry(rnode, struct xfrm_pol_inexact_node, node); + rb_erase(&node->node, &v->root); + xfrm_policy_inexact_node_reinsert(net, node, &n->root, + family); + } + + hlist_for_each_entry(tmp, &v->hhead, bydst) { + tmp->bydst_reinsert = true; + hlist_del_rcu(&tmp->bydst); + } + + xfrm_policy_inexact_list_reinsert(net, n, family); +} + +static struct xfrm_pol_inexact_node * +xfrm_policy_inexact_insert_node(struct net *net, + struct rb_root *root, + xfrm_address_t *addr, + u16 family, u8 prefixlen, u8 dir) +{ + struct xfrm_pol_inexact_node *cached = NULL; + struct rb_node **p, *parent = NULL; + struct xfrm_pol_inexact_node *node; + + p = &root->rb_node; + while (*p) { + int delta; + + parent = *p; + node = rb_entry(*p, struct xfrm_pol_inexact_node, node); + + delta = xfrm_policy_addr_delta(addr, &node->addr, + node->prefixlen, + family); + if (delta == 0 && prefixlen >= node->prefixlen) { + WARN_ON_ONCE(cached); /* ipsec policies got lost */ + return node; + } + + if (delta < 0) + p = &parent->rb_left; + else + p = &parent->rb_right; + + if (prefixlen < node->prefixlen) { + delta = xfrm_policy_addr_delta(addr, &node->addr, + prefixlen, + family); + if (delta) + continue; + + /* This node is a subnet of the new prefix. It needs + * to be removed and re-inserted with the smaller + * prefix and all nodes that are now also covered + * by the reduced prefixlen. + */ + rb_erase(&node->node, root); + + if (!cached) { + xfrm_pol_inexact_node_init(node, addr, + prefixlen); + cached = node; + } else { + /* This node also falls within the new + * prefixlen. Merge the to-be-reinserted + * node and this one. + */ + xfrm_policy_inexact_node_merge(net, node, + cached, family); + kfree_rcu(node, rcu); + } + + /* restart */ + p = &root->rb_node; + parent = NULL; + } + } + + node = cached; + if (!node) { + node = xfrm_pol_inexact_node_alloc(addr, prefixlen); + if (!node) + return NULL; + } + + rb_link_node_rcu(&node->node, parent, p); + rb_insert_color(&node->node, root); + + return node; +} + +static void xfrm_policy_inexact_gc_tree(struct rb_root *r, bool rm) +{ + struct xfrm_pol_inexact_node *node; + struct rb_node *rn = rb_first(r); + + while (rn) { + node = rb_entry(rn, struct xfrm_pol_inexact_node, node); + + xfrm_policy_inexact_gc_tree(&node->root, rm); + rn = rb_next(rn); + + if (!hlist_empty(&node->hhead) || !RB_EMPTY_ROOT(&node->root)) { + WARN_ON_ONCE(rm); + continue; + } + + rb_erase(&node->node, r); + kfree_rcu(node, rcu); + } +} + +static void __xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b, bool net_exit) +{ + write_seqcount_begin(&b->count); + xfrm_policy_inexact_gc_tree(&b->root_d, net_exit); + xfrm_policy_inexact_gc_tree(&b->root_s, net_exit); + write_seqcount_end(&b->count); + + if (!RB_EMPTY_ROOT(&b->root_d) || !RB_EMPTY_ROOT(&b->root_s) || + !hlist_empty(&b->hhead)) { + WARN_ON_ONCE(net_exit); + return; + } + + if (rhashtable_remove_fast(&xfrm_policy_inexact_table, &b->head, + xfrm_pol_inexact_params) == 0) { + list_del(&b->inexact_bins); + kfree_rcu(b, rcu); + } +} + +static void xfrm_policy_inexact_prune_bin(struct xfrm_pol_inexact_bin *b) +{ + struct net *net = read_pnet(&b->k.net); + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + __xfrm_policy_inexact_prune_bin(b, false); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); +} + +static void __xfrm_policy_inexact_flush(struct net *net) +{ + struct xfrm_pol_inexact_bin *bin, *t; + + lockdep_assert_held(&net->xfrm.xfrm_policy_lock); + + list_for_each_entry_safe(bin, t, &net->xfrm.inexact_bins, inexact_bins) + __xfrm_policy_inexact_prune_bin(bin, false); +} + +static struct hlist_head * +xfrm_policy_inexact_alloc_chain(struct xfrm_pol_inexact_bin *bin, + struct xfrm_policy *policy, u8 dir) +{ + struct xfrm_pol_inexact_node *n; + struct net *net; + + net = xp_net(policy); + lockdep_assert_held(&net->xfrm.xfrm_policy_lock); + + if (xfrm_policy_inexact_insert_use_any_list(policy)) + return &bin->hhead; + + if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.daddr, + policy->family, + policy->selector.prefixlen_d)) { + write_seqcount_begin(&bin->count); + n = xfrm_policy_inexact_insert_node(net, + &bin->root_s, + &policy->selector.saddr, + policy->family, + policy->selector.prefixlen_s, + dir); + write_seqcount_end(&bin->count); + if (!n) + return NULL; + + return &n->hhead; + } + + /* daddr is fixed */ + write_seqcount_begin(&bin->count); + n = xfrm_policy_inexact_insert_node(net, + &bin->root_d, + &policy->selector.daddr, + policy->family, + policy->selector.prefixlen_d, dir); + write_seqcount_end(&bin->count); + if (!n) + return NULL; + + /* saddr is wildcard */ + if (xfrm_pol_inexact_addr_use_any_list(&policy->selector.saddr, + policy->family, + policy->selector.prefixlen_s)) + return &n->hhead; + + write_seqcount_begin(&bin->count); + n = xfrm_policy_inexact_insert_node(net, + &n->root, + &policy->selector.saddr, + policy->family, + policy->selector.prefixlen_s, dir); + write_seqcount_end(&bin->count); + if (!n) + return NULL; + + return &n->hhead; +} + +static struct xfrm_policy * +xfrm_policy_inexact_insert(struct xfrm_policy *policy, u8 dir, int excl) +{ + struct xfrm_pol_inexact_bin *bin; + struct xfrm_policy *delpol; + struct hlist_head *chain; + struct net *net; + + bin = xfrm_policy_inexact_alloc_bin(policy, dir); + if (!bin) + return ERR_PTR(-ENOMEM); + + net = xp_net(policy); + lockdep_assert_held(&net->xfrm.xfrm_policy_lock); + + chain = xfrm_policy_inexact_alloc_chain(bin, policy, dir); + if (!chain) { + __xfrm_policy_inexact_prune_bin(bin, false); + return ERR_PTR(-ENOMEM); + } + + delpol = xfrm_policy_insert_list(chain, policy, excl); + if (delpol && excl) { + __xfrm_policy_inexact_prune_bin(bin, false); + return ERR_PTR(-EEXIST); + } + + chain = &net->xfrm.policy_inexact[dir]; + xfrm_policy_insert_inexact_list(chain, policy); + + if (delpol) + __xfrm_policy_inexact_prune_bin(bin, false); + + return delpol; +} + +static void xfrm_hash_rebuild(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, + xfrm.policy_hthresh.work); + unsigned int hmask; + struct xfrm_policy *pol; + struct xfrm_policy *policy; + struct hlist_head *chain; + struct hlist_head *odst; + struct hlist_node *newpos; + int i; + int dir; + unsigned seq; + u8 lbits4, rbits4, lbits6, rbits6; + + mutex_lock(&hash_resize_mutex); + + /* read selector prefixlen thresholds */ + do { + seq = read_seqbegin(&net->xfrm.policy_hthresh.lock); + + lbits4 = net->xfrm.policy_hthresh.lbits4; + rbits4 = net->xfrm.policy_hthresh.rbits4; + lbits6 = net->xfrm.policy_hthresh.lbits6; + rbits6 = net->xfrm.policy_hthresh.rbits6; + } while (read_seqretry(&net->xfrm.policy_hthresh.lock, seq)); + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + write_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation); + + /* make sure that we can insert the indirect policies again before + * we start with destructive action. + */ + list_for_each_entry(policy, &net->xfrm.policy_all, walk.all) { + struct xfrm_pol_inexact_bin *bin; + u8 dbits, sbits; + + if (policy->walk.dead) + continue; + + dir = xfrm_policy_id2dir(policy->index); + if (dir >= XFRM_POLICY_MAX) + continue; + + if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { + if (policy->family == AF_INET) { + dbits = rbits4; + sbits = lbits4; + } else { + dbits = rbits6; + sbits = lbits6; + } + } else { + if (policy->family == AF_INET) { + dbits = lbits4; + sbits = rbits4; + } else { + dbits = lbits6; + sbits = rbits6; + } + } + + if (policy->selector.prefixlen_d < dbits || + policy->selector.prefixlen_s < sbits) + continue; + + bin = xfrm_policy_inexact_alloc_bin(policy, dir); + if (!bin) + goto out_unlock; + + if (!xfrm_policy_inexact_alloc_chain(bin, policy, dir)) + goto out_unlock; + } + + /* reset the bydst and inexact table in all directions */ + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct hlist_node *n; + + hlist_for_each_entry_safe(policy, n, + &net->xfrm.policy_inexact[dir], + bydst_inexact_list) { + hlist_del_rcu(&policy->bydst); + hlist_del_init(&policy->bydst_inexact_list); + } + + hmask = net->xfrm.policy_bydst[dir].hmask; + odst = net->xfrm.policy_bydst[dir].table; + for (i = hmask; i >= 0; i--) { + hlist_for_each_entry_safe(policy, n, odst + i, bydst) + hlist_del_rcu(&policy->bydst); + } + if ((dir & XFRM_POLICY_MASK) == XFRM_POLICY_OUT) { + /* dir out => dst = remote, src = local */ + net->xfrm.policy_bydst[dir].dbits4 = rbits4; + net->xfrm.policy_bydst[dir].sbits4 = lbits4; + net->xfrm.policy_bydst[dir].dbits6 = rbits6; + net->xfrm.policy_bydst[dir].sbits6 = lbits6; + } else { + /* dir in/fwd => dst = local, src = remote */ + net->xfrm.policy_bydst[dir].dbits4 = lbits4; + net->xfrm.policy_bydst[dir].sbits4 = rbits4; + net->xfrm.policy_bydst[dir].dbits6 = lbits6; + net->xfrm.policy_bydst[dir].sbits6 = rbits6; + } + } + + /* re-insert all policies by order of creation */ + list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) { + if (policy->walk.dead) + continue; + dir = xfrm_policy_id2dir(policy->index); + if (dir >= XFRM_POLICY_MAX) { + /* skip socket policies */ + continue; + } + newpos = NULL; + chain = policy_hash_bysel(net, &policy->selector, + policy->family, dir); + + if (!chain) { + void *p = xfrm_policy_inexact_insert(policy, dir, 0); + + WARN_ONCE(IS_ERR(p), "reinsert: %ld\n", PTR_ERR(p)); + continue; + } + + hlist_for_each_entry(pol, chain, bydst) { + if (policy->priority >= pol->priority) + newpos = &pol->bydst; + else + break; + } + if (newpos) + hlist_add_behind_rcu(&policy->bydst, newpos); + else + hlist_add_head_rcu(&policy->bydst, chain); + } + +out_unlock: + __xfrm_policy_inexact_flush(net); + write_seqcount_end(&net->xfrm.xfrm_policy_hash_generation); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + mutex_unlock(&hash_resize_mutex); +} + +void xfrm_policy_hash_rebuild(struct net *net) +{ + schedule_work(&net->xfrm.policy_hthresh.work); +} +EXPORT_SYMBOL(xfrm_policy_hash_rebuild); + +/* Generate new index... KAME seems to generate them ordered by cost + * of an absolute inpredictability of ordering of rules. This will not pass. */ +static u32 xfrm_gen_index(struct net *net, int dir, u32 index) +{ + for (;;) { + struct hlist_head *list; + struct xfrm_policy *p; + u32 idx; + int found; + + if (!index) { + idx = (net->xfrm.idx_generator | dir); + net->xfrm.idx_generator += 8; + } else { + idx = index; + index = 0; + } + + if (idx == 0) + idx = 8; + list = net->xfrm.policy_byidx + idx_hash(net, idx); + found = 0; + hlist_for_each_entry(p, list, byidx) { + if (p->index == idx) { + found = 1; + break; + } + } + if (!found) + return idx; + } +} + +static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2) +{ + u32 *p1 = (u32 *) s1; + u32 *p2 = (u32 *) s2; + int len = sizeof(struct xfrm_selector) / sizeof(u32); + int i; + + for (i = 0; i < len; i++) { + if (p1[i] != p2[i]) + return 1; + } + + return 0; +} + +static void xfrm_policy_requeue(struct xfrm_policy *old, + struct xfrm_policy *new) +{ + struct xfrm_policy_queue *pq = &old->polq; + struct sk_buff_head list; + + if (skb_queue_empty(&pq->hold_queue)) + return; + + __skb_queue_head_init(&list); + + spin_lock_bh(&pq->hold_queue.lock); + skb_queue_splice_init(&pq->hold_queue, &list); + if (del_timer(&pq->hold_timer)) + xfrm_pol_put(old); + spin_unlock_bh(&pq->hold_queue.lock); + + pq = &new->polq; + + spin_lock_bh(&pq->hold_queue.lock); + skb_queue_splice(&list, &pq->hold_queue); + pq->timeout = XFRM_QUEUE_TMO_MIN; + if (!mod_timer(&pq->hold_timer, jiffies)) + xfrm_pol_hold(new); + spin_unlock_bh(&pq->hold_queue.lock); +} + +static inline bool xfrm_policy_mark_match(const struct xfrm_mark *mark, + struct xfrm_policy *pol) +{ + return mark->v == pol->mark.v && mark->m == pol->mark.m; +} + +static u32 xfrm_pol_bin_key(const void *data, u32 len, u32 seed) +{ + const struct xfrm_pol_inexact_key *k = data; + u32 a = k->type << 24 | k->dir << 16 | k->family; + + return jhash_3words(a, k->if_id, net_hash_mix(read_pnet(&k->net)), + seed); +} + +static u32 xfrm_pol_bin_obj(const void *data, u32 len, u32 seed) +{ + const struct xfrm_pol_inexact_bin *b = data; + + return xfrm_pol_bin_key(&b->k, 0, seed); +} + +static int xfrm_pol_bin_cmp(struct rhashtable_compare_arg *arg, + const void *ptr) +{ + const struct xfrm_pol_inexact_key *key = arg->key; + const struct xfrm_pol_inexact_bin *b = ptr; + int ret; + + if (!net_eq(read_pnet(&b->k.net), read_pnet(&key->net))) + return -1; + + ret = b->k.dir ^ key->dir; + if (ret) + return ret; + + ret = b->k.type ^ key->type; + if (ret) + return ret; + + ret = b->k.family ^ key->family; + if (ret) + return ret; + + return b->k.if_id ^ key->if_id; +} + +static const struct rhashtable_params xfrm_pol_inexact_params = { + .head_offset = offsetof(struct xfrm_pol_inexact_bin, head), + .hashfn = xfrm_pol_bin_key, + .obj_hashfn = xfrm_pol_bin_obj, + .obj_cmpfn = xfrm_pol_bin_cmp, + .automatic_shrinking = true, +}; + +static void xfrm_policy_insert_inexact_list(struct hlist_head *chain, + struct xfrm_policy *policy) +{ + struct xfrm_policy *pol, *delpol = NULL; + struct hlist_node *newpos = NULL; + int i = 0; + + hlist_for_each_entry(pol, chain, bydst_inexact_list) { + if (pol->type == policy->type && + pol->if_id == policy->if_id && + !selector_cmp(&pol->selector, &policy->selector) && + xfrm_policy_mark_match(&policy->mark, pol) && + xfrm_sec_ctx_match(pol->security, policy->security) && + !WARN_ON(delpol)) { + delpol = pol; + if (policy->priority > pol->priority) + continue; + } else if (policy->priority >= pol->priority) { + newpos = &pol->bydst_inexact_list; + continue; + } + if (delpol) + break; + } + + if (newpos) + hlist_add_behind_rcu(&policy->bydst_inexact_list, newpos); + else + hlist_add_head_rcu(&policy->bydst_inexact_list, chain); + + hlist_for_each_entry(pol, chain, bydst_inexact_list) { + pol->pos = i; + i++; + } +} + +static struct xfrm_policy *xfrm_policy_insert_list(struct hlist_head *chain, + struct xfrm_policy *policy, + bool excl) +{ + struct xfrm_policy *pol, *newpos = NULL, *delpol = NULL; + + hlist_for_each_entry(pol, chain, bydst) { + if (pol->type == policy->type && + pol->if_id == policy->if_id && + !selector_cmp(&pol->selector, &policy->selector) && + xfrm_policy_mark_match(&policy->mark, pol) && + xfrm_sec_ctx_match(pol->security, policy->security) && + !WARN_ON(delpol)) { + if (excl) + return ERR_PTR(-EEXIST); + delpol = pol; + if (policy->priority > pol->priority) + continue; + } else if (policy->priority >= pol->priority) { + newpos = pol; + continue; + } + if (delpol) + break; + } + + if (newpos) + hlist_add_behind_rcu(&policy->bydst, &newpos->bydst); + else + hlist_add_head_rcu(&policy->bydst, chain); + + return delpol; +} + +int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl) +{ + struct net *net = xp_net(policy); + struct xfrm_policy *delpol; + struct hlist_head *chain; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_bysel(net, &policy->selector, policy->family, dir); + if (chain) + delpol = xfrm_policy_insert_list(chain, policy, excl); + else + delpol = xfrm_policy_inexact_insert(policy, dir, excl); + + if (IS_ERR(delpol)) { + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return PTR_ERR(delpol); + } + + __xfrm_policy_link(policy, dir); + + /* After previous checking, family can either be AF_INET or AF_INET6 */ + if (policy->family == AF_INET) + rt_genid_bump_ipv4(net); + else + rt_genid_bump_ipv6(net); + + if (delpol) { + xfrm_policy_requeue(delpol, policy); + __xfrm_policy_unlink(delpol, dir); + } + policy->index = delpol ? delpol->index : xfrm_gen_index(net, dir, policy->index); + hlist_add_head(&policy->byidx, net->xfrm.policy_byidx+idx_hash(net, policy->index)); + policy->curlft.add_time = ktime_get_real_seconds(); + policy->curlft.use_time = 0; + if (!mod_timer(&policy->timer, jiffies + HZ)) + xfrm_pol_hold(policy); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (delpol) + xfrm_policy_kill(delpol); + else if (xfrm_bydst_should_resize(net, dir, NULL)) + schedule_work(&net->xfrm.policy_hash_work); + + return 0; +} +EXPORT_SYMBOL(xfrm_policy_insert); + +static struct xfrm_policy * +__xfrm_policy_bysel_ctx(struct hlist_head *chain, const struct xfrm_mark *mark, + u32 if_id, u8 type, int dir, struct xfrm_selector *sel, + struct xfrm_sec_ctx *ctx) +{ + struct xfrm_policy *pol; + + if (!chain) + return NULL; + + hlist_for_each_entry(pol, chain, bydst) { + if (pol->type == type && + pol->if_id == if_id && + xfrm_policy_mark_match(mark, pol) && + !selector_cmp(sel, &pol->selector) && + xfrm_sec_ctx_match(ctx, pol->security)) + return pol; + } + + return NULL; +} + +struct xfrm_policy * +xfrm_policy_bysel_ctx(struct net *net, const struct xfrm_mark *mark, u32 if_id, + u8 type, int dir, struct xfrm_selector *sel, + struct xfrm_sec_ctx *ctx, int delete, int *err) +{ + struct xfrm_pol_inexact_bin *bin = NULL; + struct xfrm_policy *pol, *ret = NULL; + struct hlist_head *chain; + + *err = 0; + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_bysel(net, sel, sel->family, dir); + if (!chain) { + struct xfrm_pol_inexact_candidates cand; + int i; + + bin = xfrm_policy_inexact_lookup(net, type, + sel->family, dir, if_id); + if (!bin) { + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return NULL; + } + + if (!xfrm_policy_find_inexact_candidates(&cand, bin, + &sel->saddr, + &sel->daddr)) { + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return NULL; + } + + pol = NULL; + for (i = 0; i < ARRAY_SIZE(cand.res); i++) { + struct xfrm_policy *tmp; + + tmp = __xfrm_policy_bysel_ctx(cand.res[i], mark, + if_id, type, dir, + sel, ctx); + if (!tmp) + continue; + + if (!pol || tmp->pos < pol->pos) + pol = tmp; + } + } else { + pol = __xfrm_policy_bysel_ctx(chain, mark, if_id, type, dir, + sel, ctx); + } + + if (pol) { + xfrm_pol_hold(pol); + if (delete) { + *err = security_xfrm_policy_delete(pol->security); + if (*err) { + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return pol; + } + __xfrm_policy_unlink(pol, dir); + } + ret = pol; + } + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (ret && delete) + xfrm_policy_kill(ret); + if (bin && delete) + xfrm_policy_inexact_prune_bin(bin); + return ret; +} +EXPORT_SYMBOL(xfrm_policy_bysel_ctx); + +struct xfrm_policy * +xfrm_policy_byid(struct net *net, const struct xfrm_mark *mark, u32 if_id, + u8 type, int dir, u32 id, int delete, int *err) +{ + struct xfrm_policy *pol, *ret; + struct hlist_head *chain; + + *err = -ENOENT; + if (xfrm_policy_id2dir(id) != dir) + return NULL; + + *err = 0; + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = net->xfrm.policy_byidx + idx_hash(net, id); + ret = NULL; + hlist_for_each_entry(pol, chain, byidx) { + if (pol->type == type && pol->index == id && + pol->if_id == if_id && xfrm_policy_mark_match(mark, pol)) { + xfrm_pol_hold(pol); + if (delete) { + *err = security_xfrm_policy_delete( + pol->security); + if (*err) { + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return pol; + } + __xfrm_policy_unlink(pol, dir); + } + ret = pol; + break; + } + } + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (ret && delete) + xfrm_policy_kill(ret); + return ret; +} +EXPORT_SYMBOL(xfrm_policy_byid); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +static inline int +xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) +{ + struct xfrm_policy *pol; + int err = 0; + + list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) { + if (pol->walk.dead || + xfrm_policy_id2dir(pol->index) >= XFRM_POLICY_MAX || + pol->type != type) + continue; + + err = security_xfrm_policy_delete(pol->security); + if (err) { + xfrm_audit_policy_delete(pol, 0, task_valid); + return err; + } + } + return err; +} +#else +static inline int +xfrm_policy_flush_secctx_check(struct net *net, u8 type, bool task_valid) +{ + return 0; +} +#endif + +int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) +{ + int dir, err = 0, cnt = 0; + struct xfrm_policy *pol; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + + err = xfrm_policy_flush_secctx_check(net, type, task_valid); + if (err) + goto out; + +again: + list_for_each_entry(pol, &net->xfrm.policy_all, walk.all) { + if (pol->walk.dead) + continue; + + dir = xfrm_policy_id2dir(pol->index); + if (dir >= XFRM_POLICY_MAX || + pol->type != type) + continue; + + __xfrm_policy_unlink(pol, dir); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + cnt++; + xfrm_audit_policy_delete(pol, 1, task_valid); + xfrm_policy_kill(pol); + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + goto again; + } + if (cnt) + __xfrm_policy_inexact_flush(net); + else + err = -ESRCH; +out: + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return err; +} +EXPORT_SYMBOL(xfrm_policy_flush); + +int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk, + int (*func)(struct xfrm_policy *, int, int, void*), + void *data) +{ + struct xfrm_policy *pol; + struct xfrm_policy_walk_entry *x; + int error = 0; + + if (walk->type >= XFRM_POLICY_TYPE_MAX && + walk->type != XFRM_POLICY_TYPE_ANY) + return -EINVAL; + + if (list_empty(&walk->walk.all) && walk->seq != 0) + return 0; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + if (list_empty(&walk->walk.all)) + x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); + else + x = list_first_entry(&walk->walk.all, + struct xfrm_policy_walk_entry, all); + + list_for_each_entry_from(x, &net->xfrm.policy_all, all) { + if (x->dead) + continue; + pol = container_of(x, struct xfrm_policy, walk); + if (walk->type != XFRM_POLICY_TYPE_ANY && + walk->type != pol->type) + continue; + error = func(pol, xfrm_policy_id2dir(pol->index), + walk->seq, data); + if (error) { + list_move_tail(&walk->walk.all, &x->all); + goto out; + } + walk->seq++; + } + if (walk->seq == 0) { + error = -ENOENT; + goto out; + } + list_del_init(&walk->walk.all); +out: + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + return error; +} +EXPORT_SYMBOL(xfrm_policy_walk); + +void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type) +{ + INIT_LIST_HEAD(&walk->walk.all); + walk->walk.dead = 1; + walk->type = type; + walk->seq = 0; +} +EXPORT_SYMBOL(xfrm_policy_walk_init); + +void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net) +{ + if (list_empty(&walk->walk.all)) + return; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); /*FIXME where is net? */ + list_del(&walk->walk.all); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); +} +EXPORT_SYMBOL(xfrm_policy_walk_done); + +/* + * Find policy to apply to this flow. + * + * Returns 0 if policy found, else an -errno. + */ +static int xfrm_policy_match(const struct xfrm_policy *pol, + const struct flowi *fl, + u8 type, u16 family, u32 if_id) +{ + const struct xfrm_selector *sel = &pol->selector; + int ret = -ESRCH; + bool match; + + if (pol->family != family || + pol->if_id != if_id || + (fl->flowi_mark & pol->mark.m) != pol->mark.v || + pol->type != type) + return ret; + + match = xfrm_selector_match(sel, fl, family); + if (match) + ret = security_xfrm_policy_lookup(pol->security, fl->flowi_secid); + return ret; +} + +static struct xfrm_pol_inexact_node * +xfrm_policy_lookup_inexact_addr(const struct rb_root *r, + seqcount_spinlock_t *count, + const xfrm_address_t *addr, u16 family) +{ + const struct rb_node *parent; + int seq; + +again: + seq = read_seqcount_begin(count); + + parent = rcu_dereference_raw(r->rb_node); + while (parent) { + struct xfrm_pol_inexact_node *node; + int delta; + + node = rb_entry(parent, struct xfrm_pol_inexact_node, node); + + delta = xfrm_policy_addr_delta(addr, &node->addr, + node->prefixlen, family); + if (delta < 0) { + parent = rcu_dereference_raw(parent->rb_left); + continue; + } else if (delta > 0) { + parent = rcu_dereference_raw(parent->rb_right); + continue; + } + + return node; + } + + if (read_seqcount_retry(count, seq)) + goto again; + + return NULL; +} + +static bool +xfrm_policy_find_inexact_candidates(struct xfrm_pol_inexact_candidates *cand, + struct xfrm_pol_inexact_bin *b, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr) +{ + struct xfrm_pol_inexact_node *n; + u16 family; + + if (!b) + return false; + + family = b->k.family; + memset(cand, 0, sizeof(*cand)); + cand->res[XFRM_POL_CAND_ANY] = &b->hhead; + + n = xfrm_policy_lookup_inexact_addr(&b->root_d, &b->count, daddr, + family); + if (n) { + cand->res[XFRM_POL_CAND_DADDR] = &n->hhead; + n = xfrm_policy_lookup_inexact_addr(&n->root, &b->count, saddr, + family); + if (n) + cand->res[XFRM_POL_CAND_BOTH] = &n->hhead; + } + + n = xfrm_policy_lookup_inexact_addr(&b->root_s, &b->count, saddr, + family); + if (n) + cand->res[XFRM_POL_CAND_SADDR] = &n->hhead; + + return true; +} + +static struct xfrm_pol_inexact_bin * +xfrm_policy_inexact_lookup_rcu(struct net *net, u8 type, u16 family, + u8 dir, u32 if_id) +{ + struct xfrm_pol_inexact_key k = { + .family = family, + .type = type, + .dir = dir, + .if_id = if_id, + }; + + write_pnet(&k.net, net); + + return rhashtable_lookup(&xfrm_policy_inexact_table, &k, + xfrm_pol_inexact_params); +} + +static struct xfrm_pol_inexact_bin * +xfrm_policy_inexact_lookup(struct net *net, u8 type, u16 family, + u8 dir, u32 if_id) +{ + struct xfrm_pol_inexact_bin *bin; + + lockdep_assert_held(&net->xfrm.xfrm_policy_lock); + + rcu_read_lock(); + bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id); + rcu_read_unlock(); + + return bin; +} + +static struct xfrm_policy * +__xfrm_policy_eval_candidates(struct hlist_head *chain, + struct xfrm_policy *prefer, + const struct flowi *fl, + u8 type, u16 family, u32 if_id) +{ + u32 priority = prefer ? prefer->priority : ~0u; + struct xfrm_policy *pol; + + if (!chain) + return NULL; + + hlist_for_each_entry_rcu(pol, chain, bydst) { + int err; + + if (pol->priority > priority) + break; + + err = xfrm_policy_match(pol, fl, type, family, if_id); + if (err) { + if (err != -ESRCH) + return ERR_PTR(err); + + continue; + } + + if (prefer) { + /* matches. Is it older than *prefer? */ + if (pol->priority == priority && + prefer->pos < pol->pos) + return prefer; + } + + return pol; + } + + return NULL; +} + +static struct xfrm_policy * +xfrm_policy_eval_candidates(struct xfrm_pol_inexact_candidates *cand, + struct xfrm_policy *prefer, + const struct flowi *fl, + u8 type, u16 family, u32 if_id) +{ + struct xfrm_policy *tmp; + int i; + + for (i = 0; i < ARRAY_SIZE(cand->res); i++) { + tmp = __xfrm_policy_eval_candidates(cand->res[i], + prefer, + fl, type, family, if_id); + if (!tmp) + continue; + + if (IS_ERR(tmp)) + return tmp; + prefer = tmp; + } + + return prefer; +} + +static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type, + const struct flowi *fl, + u16 family, u8 dir, + u32 if_id) +{ + struct xfrm_pol_inexact_candidates cand; + const xfrm_address_t *daddr, *saddr; + struct xfrm_pol_inexact_bin *bin; + struct xfrm_policy *pol, *ret; + struct hlist_head *chain; + unsigned int sequence; + int err; + + daddr = xfrm_flowi_daddr(fl, family); + saddr = xfrm_flowi_saddr(fl, family); + if (unlikely(!daddr || !saddr)) + return NULL; + + rcu_read_lock(); + retry: + do { + sequence = read_seqcount_begin(&net->xfrm.xfrm_policy_hash_generation); + chain = policy_hash_direct(net, daddr, saddr, family, dir); + } while (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence)); + + ret = NULL; + hlist_for_each_entry_rcu(pol, chain, bydst) { + err = xfrm_policy_match(pol, fl, type, family, if_id); + if (err) { + if (err == -ESRCH) + continue; + else { + ret = ERR_PTR(err); + goto fail; + } + } else { + ret = pol; + break; + } + } + bin = xfrm_policy_inexact_lookup_rcu(net, type, family, dir, if_id); + if (!bin || !xfrm_policy_find_inexact_candidates(&cand, bin, saddr, + daddr)) + goto skip_inexact; + + pol = xfrm_policy_eval_candidates(&cand, ret, fl, type, + family, if_id); + if (pol) { + ret = pol; + if (IS_ERR(pol)) + goto fail; + } + +skip_inexact: + if (read_seqcount_retry(&net->xfrm.xfrm_policy_hash_generation, sequence)) + goto retry; + + if (ret && !xfrm_pol_hold_rcu(ret)) + goto retry; +fail: + rcu_read_unlock(); + + return ret; +} + +static struct xfrm_policy *xfrm_policy_lookup(struct net *net, + const struct flowi *fl, + u16 family, u8 dir, u32 if_id) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + struct xfrm_policy *pol; + + pol = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_SUB, fl, family, + dir, if_id); + if (pol != NULL) + return pol; +#endif + return xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, fl, family, + dir, if_id); +} + +static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir, + const struct flowi *fl, + u16 family, u32 if_id) +{ + struct xfrm_policy *pol; + + rcu_read_lock(); + again: + pol = rcu_dereference(sk->sk_policy[dir]); + if (pol != NULL) { + bool match; + int err = 0; + + if (pol->family != family) { + pol = NULL; + goto out; + } + + match = xfrm_selector_match(&pol->selector, fl, family); + if (match) { + if ((READ_ONCE(sk->sk_mark) & pol->mark.m) != pol->mark.v || + pol->if_id != if_id) { + pol = NULL; + goto out; + } + err = security_xfrm_policy_lookup(pol->security, + fl->flowi_secid); + if (!err) { + if (!xfrm_pol_hold_rcu(pol)) + goto again; + } else if (err == -ESRCH) { + pol = NULL; + } else { + pol = ERR_PTR(err); + } + } else + pol = NULL; + } +out: + rcu_read_unlock(); + return pol; +} + +static void __xfrm_policy_link(struct xfrm_policy *pol, int dir) +{ + struct net *net = xp_net(pol); + + list_add(&pol->walk.all, &net->xfrm.policy_all); + net->xfrm.policy_count[dir]++; + xfrm_pol_hold(pol); +} + +static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, + int dir) +{ + struct net *net = xp_net(pol); + + if (list_empty(&pol->walk.all)) + return NULL; + + /* Socket policies are not hashed. */ + if (!hlist_unhashed(&pol->bydst)) { + hlist_del_rcu(&pol->bydst); + hlist_del_init(&pol->bydst_inexact_list); + hlist_del(&pol->byidx); + } + + list_del_init(&pol->walk.all); + net->xfrm.policy_count[dir]--; + + return pol; +} + +static void xfrm_sk_policy_link(struct xfrm_policy *pol, int dir) +{ + __xfrm_policy_link(pol, XFRM_POLICY_MAX + dir); +} + +static void xfrm_sk_policy_unlink(struct xfrm_policy *pol, int dir) +{ + __xfrm_policy_unlink(pol, XFRM_POLICY_MAX + dir); +} + +int xfrm_policy_delete(struct xfrm_policy *pol, int dir) +{ + struct net *net = xp_net(pol); + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + pol = __xfrm_policy_unlink(pol, dir); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + if (pol) { + xfrm_policy_kill(pol); + return 0; + } + return -ENOENT; +} +EXPORT_SYMBOL(xfrm_policy_delete); + +int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) +{ + struct net *net = sock_net(sk); + struct xfrm_policy *old_pol; + +#ifdef CONFIG_XFRM_SUB_POLICY + if (pol && pol->type != XFRM_POLICY_TYPE_MAIN) + return -EINVAL; +#endif + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + old_pol = rcu_dereference_protected(sk->sk_policy[dir], + lockdep_is_held(&net->xfrm.xfrm_policy_lock)); + if (pol) { + pol->curlft.add_time = ktime_get_real_seconds(); + pol->index = xfrm_gen_index(net, XFRM_POLICY_MAX+dir, 0); + xfrm_sk_policy_link(pol, dir); + } + rcu_assign_pointer(sk->sk_policy[dir], pol); + if (old_pol) { + if (pol) + xfrm_policy_requeue(old_pol, pol); + + /* Unlinking succeeds always. This is the only function + * allowed to delete or replace socket policy. + */ + xfrm_sk_policy_unlink(old_pol, dir); + } + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + if (old_pol) { + xfrm_policy_kill(old_pol); + } + return 0; +} + +static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir) +{ + struct xfrm_policy *newp = xfrm_policy_alloc(xp_net(old), GFP_ATOMIC); + struct net *net = xp_net(old); + + if (newp) { + newp->selector = old->selector; + if (security_xfrm_policy_clone(old->security, + &newp->security)) { + kfree(newp); + return NULL; /* ENOMEM */ + } + newp->lft = old->lft; + newp->curlft = old->curlft; + newp->mark = old->mark; + newp->if_id = old->if_id; + newp->action = old->action; + newp->flags = old->flags; + newp->xfrm_nr = old->xfrm_nr; + newp->index = old->index; + newp->type = old->type; + newp->family = old->family; + memcpy(newp->xfrm_vec, old->xfrm_vec, + newp->xfrm_nr*sizeof(struct xfrm_tmpl)); + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + xfrm_sk_policy_link(newp, dir); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + xfrm_pol_put(newp); + } + return newp; +} + +int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) +{ + const struct xfrm_policy *p; + struct xfrm_policy *np; + int i, ret = 0; + + rcu_read_lock(); + for (i = 0; i < 2; i++) { + p = rcu_dereference(osk->sk_policy[i]); + if (p) { + np = clone_policy(p, i); + if (unlikely(!np)) { + ret = -ENOMEM; + break; + } + rcu_assign_pointer(sk->sk_policy[i], np); + } + } + rcu_read_unlock(); + return ret; +} + +static int +xfrm_get_saddr(struct net *net, int oif, xfrm_address_t *local, + xfrm_address_t *remote, unsigned short family, u32 mark) +{ + int err; + const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + + if (unlikely(afinfo == NULL)) + return -EINVAL; + err = afinfo->get_saddr(net, oif, local, remote, mark); + rcu_read_unlock(); + return err; +} + +/* Resolve list of templates for the flow, given policy. */ + +static int +xfrm_tmpl_resolve_one(struct xfrm_policy *policy, const struct flowi *fl, + struct xfrm_state **xfrm, unsigned short family) +{ + struct net *net = xp_net(policy); + int nx; + int i, error; + xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family); + xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family); + xfrm_address_t tmp; + + for (nx = 0, i = 0; i < policy->xfrm_nr; i++) { + struct xfrm_state *x; + xfrm_address_t *remote = daddr; + xfrm_address_t *local = saddr; + struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i]; + + if (tmpl->mode == XFRM_MODE_TUNNEL || + tmpl->mode == XFRM_MODE_BEET) { + remote = &tmpl->id.daddr; + local = &tmpl->saddr; + if (xfrm_addr_any(local, tmpl->encap_family)) { + error = xfrm_get_saddr(net, fl->flowi_oif, + &tmp, remote, + tmpl->encap_family, 0); + if (error) + goto fail; + local = &tmp; + } + } + + x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, + family, policy->if_id); + + if (x && x->km.state == XFRM_STATE_VALID) { + xfrm[nx++] = x; + daddr = remote; + saddr = local; + continue; + } + if (x) { + error = (x->km.state == XFRM_STATE_ERROR ? + -EINVAL : -EAGAIN); + xfrm_state_put(x); + } else if (error == -ESRCH) { + error = -EAGAIN; + } + + if (!tmpl->optional) + goto fail; + } + return nx; + +fail: + for (nx--; nx >= 0; nx--) + xfrm_state_put(xfrm[nx]); + return error; +} + +static int +xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, const struct flowi *fl, + struct xfrm_state **xfrm, unsigned short family) +{ + struct xfrm_state *tp[XFRM_MAX_DEPTH]; + struct xfrm_state **tpp = (npols > 1) ? tp : xfrm; + int cnx = 0; + int error; + int ret; + int i; + + for (i = 0; i < npols; i++) { + if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) { + error = -ENOBUFS; + goto fail; + } + + ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family); + if (ret < 0) { + error = ret; + goto fail; + } else + cnx += ret; + } + + /* found states are sorted for outbound processing */ + if (npols > 1) + xfrm_state_sort(xfrm, tpp, cnx, family); + + return cnx; + + fail: + for (cnx--; cnx >= 0; cnx--) + xfrm_state_put(tpp[cnx]); + return error; + +} + +static int xfrm_get_tos(const struct flowi *fl, int family) +{ + if (family == AF_INET) + return IPTOS_RT_MASK & fl->u.ip4.flowi4_tos; + + return 0; +} + +static inline struct xfrm_dst *xfrm_alloc_dst(struct net *net, int family) +{ + const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + struct dst_ops *dst_ops; + struct xfrm_dst *xdst; + + if (!afinfo) + return ERR_PTR(-EINVAL); + + switch (family) { + case AF_INET: + dst_ops = &net->xfrm.xfrm4_dst_ops; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + dst_ops = &net->xfrm.xfrm6_dst_ops; + break; +#endif + default: + BUG(); + } + xdst = dst_alloc(dst_ops, NULL, 1, DST_OBSOLETE_NONE, 0); + + if (likely(xdst)) { + memset_after(xdst, 0, u.dst); + } else + xdst = ERR_PTR(-ENOBUFS); + + rcu_read_unlock(); + + return xdst; +} + +static void xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst, + int nfheader_len) +{ + if (dst->ops->family == AF_INET6) { + struct rt6_info *rt = (struct rt6_info *)dst; + path->path_cookie = rt6_get_cookie(rt); + path->u.rt6.rt6i_nfheader_len = nfheader_len; + } +} + +static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev, + const struct flowi *fl) +{ + const struct xfrm_policy_afinfo *afinfo = + xfrm_policy_get_afinfo(xdst->u.dst.ops->family); + int err; + + if (!afinfo) + return -EINVAL; + + err = afinfo->fill_dst(xdst, dev, fl); + + rcu_read_unlock(); + + return err; +} + + +/* Allocate chain of dst_entry's, attach known xfrm's, calculate + * all the metrics... Shortly, bundle a bundle. + */ + +static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, + struct xfrm_state **xfrm, + struct xfrm_dst **bundle, + int nx, + const struct flowi *fl, + struct dst_entry *dst) +{ + const struct xfrm_state_afinfo *afinfo; + const struct xfrm_mode *inner_mode; + struct net *net = xp_net(policy); + unsigned long now = jiffies; + struct net_device *dev; + struct xfrm_dst *xdst_prev = NULL; + struct xfrm_dst *xdst0 = NULL; + int i = 0; + int err; + int header_len = 0; + int nfheader_len = 0; + int trailer_len = 0; + int tos; + int family = policy->selector.family; + xfrm_address_t saddr, daddr; + + xfrm_flowi_addr_get(fl, &saddr, &daddr, family); + + tos = xfrm_get_tos(fl, family); + + dst_hold(dst); + + for (; i < nx; i++) { + struct xfrm_dst *xdst = xfrm_alloc_dst(net, family); + struct dst_entry *dst1 = &xdst->u.dst; + + err = PTR_ERR(xdst); + if (IS_ERR(xdst)) { + dst_release(dst); + goto put_states; + } + + bundle[i] = xdst; + if (!xdst_prev) + xdst0 = xdst; + else + /* Ref count is taken during xfrm_alloc_dst() + * No need to do dst_clone() on dst1 + */ + xfrm_dst_set_child(xdst_prev, &xdst->u.dst); + + if (xfrm[i]->sel.family == AF_UNSPEC) { + inner_mode = xfrm_ip2inner_mode(xfrm[i], + xfrm_af2proto(family)); + if (!inner_mode) { + err = -EAFNOSUPPORT; + dst_release(dst); + goto put_states; + } + } else + inner_mode = &xfrm[i]->inner_mode; + + xdst->route = dst; + dst_copy_metrics(dst1, dst); + + if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { + __u32 mark = 0; + int oif; + + if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m) + mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]); + + family = xfrm[i]->props.family; + oif = fl->flowi_oif ? : fl->flowi_l3mdev; + dst = xfrm_dst_lookup(xfrm[i], tos, oif, + &saddr, &daddr, family, mark); + err = PTR_ERR(dst); + if (IS_ERR(dst)) + goto put_states; + } else + dst_hold(dst); + + dst1->xfrm = xfrm[i]; + xdst->xfrm_genid = xfrm[i]->genid; + + dst1->obsolete = DST_OBSOLETE_FORCE_CHK; + dst1->lastuse = now; + + dst1->input = dst_discard; + + rcu_read_lock(); + afinfo = xfrm_state_afinfo_get_rcu(inner_mode->family); + if (likely(afinfo)) + dst1->output = afinfo->output; + else + dst1->output = dst_discard_out; + rcu_read_unlock(); + + xdst_prev = xdst; + + header_len += xfrm[i]->props.header_len; + if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT) + nfheader_len += xfrm[i]->props.header_len; + trailer_len += xfrm[i]->props.trailer_len; + } + + xfrm_dst_set_child(xdst_prev, dst); + xdst0->path = dst; + + err = -ENODEV; + dev = dst->dev; + if (!dev) + goto free_dst; + + xfrm_init_path(xdst0, dst, nfheader_len); + xfrm_init_pmtu(bundle, nx); + + for (xdst_prev = xdst0; xdst_prev != (struct xfrm_dst *)dst; + xdst_prev = (struct xfrm_dst *) xfrm_dst_child(&xdst_prev->u.dst)) { + err = xfrm_fill_dst(xdst_prev, dev, fl); + if (err) + goto free_dst; + + xdst_prev->u.dst.header_len = header_len; + xdst_prev->u.dst.trailer_len = trailer_len; + header_len -= xdst_prev->u.dst.xfrm->props.header_len; + trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len; + } + + return &xdst0->u.dst; + +put_states: + for (; i < nx; i++) + xfrm_state_put(xfrm[i]); +free_dst: + if (xdst0) + dst_release_immediate(&xdst0->u.dst); + + return ERR_PTR(err); +} + +static int xfrm_expand_policies(const struct flowi *fl, u16 family, + struct xfrm_policy **pols, + int *num_pols, int *num_xfrms) +{ + int i; + + if (*num_pols == 0 || !pols[0]) { + *num_pols = 0; + *num_xfrms = 0; + return 0; + } + if (IS_ERR(pols[0])) { + *num_pols = 0; + return PTR_ERR(pols[0]); + } + + *num_xfrms = pols[0]->xfrm_nr; + +#ifdef CONFIG_XFRM_SUB_POLICY + if (pols[0]->action == XFRM_POLICY_ALLOW && + pols[0]->type != XFRM_POLICY_TYPE_MAIN) { + pols[1] = xfrm_policy_lookup_bytype(xp_net(pols[0]), + XFRM_POLICY_TYPE_MAIN, + fl, family, + XFRM_POLICY_OUT, + pols[0]->if_id); + if (pols[1]) { + if (IS_ERR(pols[1])) { + xfrm_pols_put(pols, *num_pols); + *num_pols = 0; + return PTR_ERR(pols[1]); + } + (*num_pols)++; + (*num_xfrms) += pols[1]->xfrm_nr; + } + } +#endif + for (i = 0; i < *num_pols; i++) { + if (pols[i]->action != XFRM_POLICY_ALLOW) { + *num_xfrms = -1; + break; + } + } + + return 0; + +} + +static struct xfrm_dst * +xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols, + const struct flowi *fl, u16 family, + struct dst_entry *dst_orig) +{ + struct net *net = xp_net(pols[0]); + struct xfrm_state *xfrm[XFRM_MAX_DEPTH]; + struct xfrm_dst *bundle[XFRM_MAX_DEPTH]; + struct xfrm_dst *xdst; + struct dst_entry *dst; + int err; + + /* Try to instantiate a bundle */ + err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family); + if (err <= 0) { + if (err == 0) + return NULL; + + if (err != -EAGAIN) + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); + return ERR_PTR(err); + } + + dst = xfrm_bundle_create(pols[0], xfrm, bundle, err, fl, dst_orig); + if (IS_ERR(dst)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTBUNDLEGENERROR); + return ERR_CAST(dst); + } + + xdst = (struct xfrm_dst *)dst; + xdst->num_xfrms = err; + xdst->num_pols = num_pols; + memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); + xdst->policy_genid = atomic_read(&pols[0]->genid); + + return xdst; +} + +static void xfrm_policy_queue_process(struct timer_list *t) +{ + struct sk_buff *skb; + struct sock *sk; + struct dst_entry *dst; + struct xfrm_policy *pol = from_timer(pol, t, polq.hold_timer); + struct net *net = xp_net(pol); + struct xfrm_policy_queue *pq = &pol->polq; + struct flowi fl; + struct sk_buff_head list; + __u32 skb_mark; + + spin_lock(&pq->hold_queue.lock); + skb = skb_peek(&pq->hold_queue); + if (!skb) { + spin_unlock(&pq->hold_queue.lock); + goto out; + } + dst = skb_dst(skb); + sk = skb->sk; + + /* Fixup the mark to support VTI. */ + skb_mark = skb->mark; + skb->mark = pol->mark.v; + xfrm_decode_session(skb, &fl, dst->ops->family); + skb->mark = skb_mark; + spin_unlock(&pq->hold_queue.lock); + + dst_hold(xfrm_dst_path(dst)); + dst = xfrm_lookup(net, xfrm_dst_path(dst), &fl, sk, XFRM_LOOKUP_QUEUE); + if (IS_ERR(dst)) + goto purge_queue; + + if (dst->flags & DST_XFRM_QUEUE) { + dst_release(dst); + + if (pq->timeout >= XFRM_QUEUE_TMO_MAX) + goto purge_queue; + + pq->timeout = pq->timeout << 1; + if (!mod_timer(&pq->hold_timer, jiffies + pq->timeout)) + xfrm_pol_hold(pol); + goto out; + } + + dst_release(dst); + + __skb_queue_head_init(&list); + + spin_lock(&pq->hold_queue.lock); + pq->timeout = 0; + skb_queue_splice_init(&pq->hold_queue, &list); + spin_unlock(&pq->hold_queue.lock); + + while (!skb_queue_empty(&list)) { + skb = __skb_dequeue(&list); + + /* Fixup the mark to support VTI. */ + skb_mark = skb->mark; + skb->mark = pol->mark.v; + xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family); + skb->mark = skb_mark; + + dst_hold(xfrm_dst_path(skb_dst(skb))); + dst = xfrm_lookup(net, xfrm_dst_path(skb_dst(skb)), &fl, skb->sk, 0); + if (IS_ERR(dst)) { + kfree_skb(skb); + continue; + } + + nf_reset_ct(skb); + skb_dst_drop(skb); + skb_dst_set(skb, dst); + + dst_output(net, skb->sk, skb); + } + +out: + xfrm_pol_put(pol); + return; + +purge_queue: + pq->timeout = 0; + skb_queue_purge(&pq->hold_queue); + xfrm_pol_put(pol); +} + +static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb) +{ + unsigned long sched_next; + struct dst_entry *dst = skb_dst(skb); + struct xfrm_dst *xdst = (struct xfrm_dst *) dst; + struct xfrm_policy *pol = xdst->pols[0]; + struct xfrm_policy_queue *pq = &pol->polq; + + if (unlikely(skb_fclone_busy(sk, skb))) { + kfree_skb(skb); + return 0; + } + + if (pq->hold_queue.qlen > XFRM_MAX_QUEUE_LEN) { + kfree_skb(skb); + return -EAGAIN; + } + + skb_dst_force(skb); + + spin_lock_bh(&pq->hold_queue.lock); + + if (!pq->timeout) + pq->timeout = XFRM_QUEUE_TMO_MIN; + + sched_next = jiffies + pq->timeout; + + if (del_timer(&pq->hold_timer)) { + if (time_before(pq->hold_timer.expires, sched_next)) + sched_next = pq->hold_timer.expires; + xfrm_pol_put(pol); + } + + __skb_queue_tail(&pq->hold_queue, skb); + if (!mod_timer(&pq->hold_timer, sched_next)) + xfrm_pol_hold(pol); + + spin_unlock_bh(&pq->hold_queue.lock); + + return 0; +} + +static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net, + struct xfrm_flo *xflo, + const struct flowi *fl, + int num_xfrms, + u16 family) +{ + int err; + struct net_device *dev; + struct dst_entry *dst; + struct dst_entry *dst1; + struct xfrm_dst *xdst; + + xdst = xfrm_alloc_dst(net, family); + if (IS_ERR(xdst)) + return xdst; + + if (!(xflo->flags & XFRM_LOOKUP_QUEUE) || + net->xfrm.sysctl_larval_drop || + num_xfrms <= 0) + return xdst; + + dst = xflo->dst_orig; + dst1 = &xdst->u.dst; + dst_hold(dst); + xdst->route = dst; + + dst_copy_metrics(dst1, dst); + + dst1->obsolete = DST_OBSOLETE_FORCE_CHK; + dst1->flags |= DST_XFRM_QUEUE; + dst1->lastuse = jiffies; + + dst1->input = dst_discard; + dst1->output = xdst_queue_output; + + dst_hold(dst); + xfrm_dst_set_child(xdst, dst); + xdst->path = dst; + + xfrm_init_path((struct xfrm_dst *)dst1, dst, 0); + + err = -ENODEV; + dev = dst->dev; + if (!dev) + goto free_dst; + + err = xfrm_fill_dst(xdst, dev, fl); + if (err) + goto free_dst; + +out: + return xdst; + +free_dst: + dst_release(dst1); + xdst = ERR_PTR(err); + goto out; +} + +static struct xfrm_dst *xfrm_bundle_lookup(struct net *net, + const struct flowi *fl, + u16 family, u8 dir, + struct xfrm_flo *xflo, u32 if_id) +{ + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + int num_pols = 0, num_xfrms = 0, err; + struct xfrm_dst *xdst; + + /* Resolve policies to use if we couldn't get them from + * previous cache entry */ + num_pols = 1; + pols[0] = xfrm_policy_lookup(net, fl, family, dir, if_id); + err = xfrm_expand_policies(fl, family, pols, + &num_pols, &num_xfrms); + if (err < 0) + goto inc_error; + if (num_pols == 0) + return NULL; + if (num_xfrms <= 0) + goto make_dummy_bundle; + + xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family, + xflo->dst_orig); + if (IS_ERR(xdst)) { + err = PTR_ERR(xdst); + if (err == -EREMOTE) { + xfrm_pols_put(pols, num_pols); + return NULL; + } + + if (err != -EAGAIN) + goto error; + goto make_dummy_bundle; + } else if (xdst == NULL) { + num_xfrms = 0; + goto make_dummy_bundle; + } + + return xdst; + +make_dummy_bundle: + /* We found policies, but there's no bundles to instantiate: + * either because the policy blocks, has no transformations or + * we could not build template (no xfrm_states).*/ + xdst = xfrm_create_dummy_bundle(net, xflo, fl, num_xfrms, family); + if (IS_ERR(xdst)) { + xfrm_pols_put(pols, num_pols); + return ERR_CAST(xdst); + } + xdst->num_pols = num_pols; + xdst->num_xfrms = num_xfrms; + memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols); + + return xdst; + +inc_error: + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLERROR); +error: + xfrm_pols_put(pols, num_pols); + return ERR_PTR(err); +} + +static struct dst_entry *make_blackhole(struct net *net, u16 family, + struct dst_entry *dst_orig) +{ + const struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family); + struct dst_entry *ret; + + if (!afinfo) { + dst_release(dst_orig); + return ERR_PTR(-EINVAL); + } else { + ret = afinfo->blackhole_route(net, dst_orig); + } + rcu_read_unlock(); + + return ret; +} + +/* Finds/creates a bundle for given flow and if_id + * + * At the moment we eat a raw IP route. Mostly to speed up lookups + * on interfaces with disabled IPsec. + * + * xfrm_lookup uses an if_id of 0 by default, and is provided for + * compatibility + */ +struct dst_entry *xfrm_lookup_with_ifid(struct net *net, + struct dst_entry *dst_orig, + const struct flowi *fl, + const struct sock *sk, + int flags, u32 if_id) +{ + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + struct xfrm_dst *xdst; + struct dst_entry *dst, *route; + u16 family = dst_orig->ops->family; + u8 dir = XFRM_POLICY_OUT; + int i, err, num_pols, num_xfrms = 0, drop_pols = 0; + + dst = NULL; + xdst = NULL; + route = NULL; + + sk = sk_const_to_full_sk(sk); + if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { + num_pols = 1; + pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family, + if_id); + err = xfrm_expand_policies(fl, family, pols, + &num_pols, &num_xfrms); + if (err < 0) + goto dropdst; + + if (num_pols) { + if (num_xfrms <= 0) { + drop_pols = num_pols; + goto no_transform; + } + + xdst = xfrm_resolve_and_create_bundle( + pols, num_pols, fl, + family, dst_orig); + + if (IS_ERR(xdst)) { + xfrm_pols_put(pols, num_pols); + err = PTR_ERR(xdst); + if (err == -EREMOTE) + goto nopol; + + goto dropdst; + } else if (xdst == NULL) { + num_xfrms = 0; + drop_pols = num_pols; + goto no_transform; + } + + route = xdst->route; + } + } + + if (xdst == NULL) { + struct xfrm_flo xflo; + + xflo.dst_orig = dst_orig; + xflo.flags = flags; + + /* To accelerate a bit... */ + if (!if_id && ((dst_orig->flags & DST_NOXFRM) || + !net->xfrm.policy_count[XFRM_POLICY_OUT])) + goto nopol; + + xdst = xfrm_bundle_lookup(net, fl, family, dir, &xflo, if_id); + if (xdst == NULL) + goto nopol; + if (IS_ERR(xdst)) { + err = PTR_ERR(xdst); + goto dropdst; + } + + num_pols = xdst->num_pols; + num_xfrms = xdst->num_xfrms; + memcpy(pols, xdst->pols, sizeof(struct xfrm_policy *) * num_pols); + route = xdst->route; + } + + dst = &xdst->u.dst; + if (route == NULL && num_xfrms > 0) { + /* The only case when xfrm_bundle_lookup() returns a + * bundle with null route, is when the template could + * not be resolved. It means policies are there, but + * bundle could not be created, since we don't yet + * have the xfrm_state's. We need to wait for KM to + * negotiate new SA's or bail out with error.*/ + if (net->xfrm.sysctl_larval_drop) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); + err = -EREMOTE; + goto error; + } + + err = -EAGAIN; + + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES); + goto error; + } + +no_transform: + if (num_pols == 0) + goto nopol; + + if ((flags & XFRM_LOOKUP_ICMP) && + !(pols[0]->flags & XFRM_POLICY_ICMP)) { + err = -ENOENT; + goto error; + } + + for (i = 0; i < num_pols; i++) + WRITE_ONCE(pols[i]->curlft.use_time, ktime_get_real_seconds()); + + if (num_xfrms < 0) { + /* Prohibit the flow */ + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTPOLBLOCK); + err = -EPERM; + goto error; + } else if (num_xfrms > 0) { + /* Flow transformed */ + dst_release(dst_orig); + } else { + /* Flow passes untransformed */ + dst_release(dst); + dst = dst_orig; + } +ok: + xfrm_pols_put(pols, drop_pols); + if (dst && dst->xfrm && + dst->xfrm->props.mode == XFRM_MODE_TUNNEL) + dst->flags |= DST_XFRM_TUNNEL; + return dst; + +nopol: + if ((!dst_orig->dev || !(dst_orig->dev->flags & IFF_LOOPBACK)) && + net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) { + err = -EPERM; + goto error; + } + if (!(flags & XFRM_LOOKUP_ICMP)) { + dst = dst_orig; + goto ok; + } + err = -ENOENT; +error: + dst_release(dst); +dropdst: + if (!(flags & XFRM_LOOKUP_KEEP_DST_REF)) + dst_release(dst_orig); + xfrm_pols_put(pols, drop_pols); + return ERR_PTR(err); +} +EXPORT_SYMBOL(xfrm_lookup_with_ifid); + +/* Main function: finds/creates a bundle for given flow. + * + * At the moment we eat a raw IP route. Mostly to speed up lookups + * on interfaces with disabled IPsec. + */ +struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, const struct sock *sk, + int flags) +{ + return xfrm_lookup_with_ifid(net, dst_orig, fl, sk, flags, 0); +} +EXPORT_SYMBOL(xfrm_lookup); + +/* Callers of xfrm_lookup_route() must ensure a call to dst_output(). + * Otherwise we may send out blackholed packets. + */ +struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig, + const struct flowi *fl, + const struct sock *sk, int flags) +{ + struct dst_entry *dst = xfrm_lookup(net, dst_orig, fl, sk, + flags | XFRM_LOOKUP_QUEUE | + XFRM_LOOKUP_KEEP_DST_REF); + + if (PTR_ERR(dst) == -EREMOTE) + return make_blackhole(net, dst_orig->ops->family, dst_orig); + + if (IS_ERR(dst)) + dst_release(dst_orig); + + return dst; +} +EXPORT_SYMBOL(xfrm_lookup_route); + +static inline int +xfrm_secpath_reject(int idx, struct sk_buff *skb, const struct flowi *fl) +{ + struct sec_path *sp = skb_sec_path(skb); + struct xfrm_state *x; + + if (!sp || idx < 0 || idx >= sp->len) + return 0; + x = sp->xvec[idx]; + if (!x->type->reject) + return 0; + return x->type->reject(x, skb, fl); +} + +/* When skb is transformed back to its "native" form, we have to + * check policy restrictions. At the moment we make this in maximally + * stupid way. Shame on me. :-) Of course, connected sockets must + * have policy cached at them. + */ + +static inline int +xfrm_state_ok(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, + unsigned short family, u32 if_id) +{ + if (xfrm_state_kern(x)) + return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family); + return x->id.proto == tmpl->id.proto && + (x->id.spi == tmpl->id.spi || !tmpl->id.spi) && + (x->props.reqid == tmpl->reqid || !tmpl->reqid) && + x->props.mode == tmpl->mode && + (tmpl->allalgs || (tmpl->aalgos & (1<props.aalgo)) || + !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) && + !(x->props.mode != XFRM_MODE_TRANSPORT && + xfrm_state_addr_cmp(tmpl, x, family)) && + (if_id == 0 || if_id == x->if_id); +} + +/* + * 0 or more than 0 is returned when validation is succeeded (either bypass + * because of optional transport mode, or next index of the matched secpath + * state with the template. + * -1 is returned when no matching template is found. + * Otherwise "-2 - errored_index" is returned. + */ +static inline int +xfrm_policy_ok(const struct xfrm_tmpl *tmpl, const struct sec_path *sp, int start, + unsigned short family, u32 if_id) +{ + int idx = start; + + if (tmpl->optional) { + if (tmpl->mode == XFRM_MODE_TRANSPORT) + return start; + } else + start = -1; + for (; idx < sp->len; idx++) { + if (xfrm_state_ok(tmpl, sp->xvec[idx], family, if_id)) + return ++idx; + if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) { + if (idx < sp->verified_cnt) { + /* Secpath entry previously verified, consider optional and + * continue searching + */ + continue; + } + + if (start == -1) + start = -2-idx; + break; + } + } + return start; +} + +static void +decode_session4(struct sk_buff *skb, struct flowi *fl, bool reverse) +{ + const struct iphdr *iph = ip_hdr(skb); + int ihl = iph->ihl; + u8 *xprth = skb_network_header(skb) + ihl * 4; + struct flowi4 *fl4 = &fl->u.ip4; + int oif = 0; + + if (skb_dst(skb) && skb_dst(skb)->dev) + oif = skb_dst(skb)->dev->ifindex; + + memset(fl4, 0, sizeof(struct flowi4)); + fl4->flowi4_mark = skb->mark; + fl4->flowi4_oif = reverse ? skb->skb_iif : oif; + + fl4->flowi4_proto = iph->protocol; + fl4->daddr = reverse ? iph->saddr : iph->daddr; + fl4->saddr = reverse ? iph->daddr : iph->saddr; + fl4->flowi4_tos = iph->tos & ~INET_ECN_MASK; + + if (!ip_is_fragment(iph)) { + switch (iph->protocol) { + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_TCP: + case IPPROTO_SCTP: + case IPPROTO_DCCP: + if (xprth + 4 < skb->data || + pskb_may_pull(skb, xprth + 4 - skb->data)) { + __be16 *ports; + + xprth = skb_network_header(skb) + ihl * 4; + ports = (__be16 *)xprth; + + fl4->fl4_sport = ports[!!reverse]; + fl4->fl4_dport = ports[!reverse]; + } + break; + case IPPROTO_ICMP: + if (xprth + 2 < skb->data || + pskb_may_pull(skb, xprth + 2 - skb->data)) { + u8 *icmp; + + xprth = skb_network_header(skb) + ihl * 4; + icmp = xprth; + + fl4->fl4_icmp_type = icmp[0]; + fl4->fl4_icmp_code = icmp[1]; + } + break; + case IPPROTO_GRE: + if (xprth + 12 < skb->data || + pskb_may_pull(skb, xprth + 12 - skb->data)) { + __be16 *greflags; + __be32 *gre_hdr; + + xprth = skb_network_header(skb) + ihl * 4; + greflags = (__be16 *)xprth; + gre_hdr = (__be32 *)xprth; + + if (greflags[0] & GRE_KEY) { + if (greflags[0] & GRE_CSUM) + gre_hdr++; + fl4->fl4_gre_key = gre_hdr[1]; + } + } + break; + default: + break; + } + } +} + +#if IS_ENABLED(CONFIG_IPV6) +static void +decode_session6(struct sk_buff *skb, struct flowi *fl, bool reverse) +{ + struct flowi6 *fl6 = &fl->u.ip6; + int onlyproto = 0; + const struct ipv6hdr *hdr = ipv6_hdr(skb); + u32 offset = sizeof(*hdr); + struct ipv6_opt_hdr *exthdr; + const unsigned char *nh = skb_network_header(skb); + u16 nhoff = IP6CB(skb)->nhoff; + int oif = 0; + u8 nexthdr; + + if (!nhoff) + nhoff = offsetof(struct ipv6hdr, nexthdr); + + nexthdr = nh[nhoff]; + + if (skb_dst(skb) && skb_dst(skb)->dev) + oif = skb_dst(skb)->dev->ifindex; + + memset(fl6, 0, sizeof(struct flowi6)); + fl6->flowi6_mark = skb->mark; + fl6->flowi6_oif = reverse ? skb->skb_iif : oif; + + fl6->daddr = reverse ? hdr->saddr : hdr->daddr; + fl6->saddr = reverse ? hdr->daddr : hdr->saddr; + + while (nh + offset + sizeof(*exthdr) < skb->data || + pskb_may_pull(skb, nh + offset + sizeof(*exthdr) - skb->data)) { + nh = skb_network_header(skb); + exthdr = (struct ipv6_opt_hdr *)(nh + offset); + + switch (nexthdr) { + case NEXTHDR_FRAGMENT: + onlyproto = 1; + fallthrough; + case NEXTHDR_ROUTING: + case NEXTHDR_HOP: + case NEXTHDR_DEST: + offset += ipv6_optlen(exthdr); + nexthdr = exthdr->nexthdr; + break; + case IPPROTO_UDP: + case IPPROTO_UDPLITE: + case IPPROTO_TCP: + case IPPROTO_SCTP: + case IPPROTO_DCCP: + if (!onlyproto && (nh + offset + 4 < skb->data || + pskb_may_pull(skb, nh + offset + 4 - skb->data))) { + __be16 *ports; + + nh = skb_network_header(skb); + ports = (__be16 *)(nh + offset); + fl6->fl6_sport = ports[!!reverse]; + fl6->fl6_dport = ports[!reverse]; + } + fl6->flowi6_proto = nexthdr; + return; + case IPPROTO_ICMPV6: + if (!onlyproto && (nh + offset + 2 < skb->data || + pskb_may_pull(skb, nh + offset + 2 - skb->data))) { + u8 *icmp; + + nh = skb_network_header(skb); + icmp = (u8 *)(nh + offset); + fl6->fl6_icmp_type = icmp[0]; + fl6->fl6_icmp_code = icmp[1]; + } + fl6->flowi6_proto = nexthdr; + return; + case IPPROTO_GRE: + if (!onlyproto && + (nh + offset + 12 < skb->data || + pskb_may_pull(skb, nh + offset + 12 - skb->data))) { + struct gre_base_hdr *gre_hdr; + __be32 *gre_key; + + nh = skb_network_header(skb); + gre_hdr = (struct gre_base_hdr *)(nh + offset); + gre_key = (__be32 *)(gre_hdr + 1); + + if (gre_hdr->flags & GRE_KEY) { + if (gre_hdr->flags & GRE_CSUM) + gre_key++; + fl6->fl6_gre_key = *gre_key; + } + } + fl6->flowi6_proto = nexthdr; + return; + +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPPROTO_MH: + offset += ipv6_optlen(exthdr); + if (!onlyproto && (nh + offset + 3 < skb->data || + pskb_may_pull(skb, nh + offset + 3 - skb->data))) { + struct ip6_mh *mh; + + nh = skb_network_header(skb); + mh = (struct ip6_mh *)(nh + offset); + fl6->fl6_mh_type = mh->ip6mh_type; + } + fl6->flowi6_proto = nexthdr; + return; +#endif + default: + fl6->flowi6_proto = nexthdr; + return; + } + } +} +#endif + +int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, + unsigned int family, int reverse) +{ + switch (family) { + case AF_INET: + decode_session4(skb, fl, reverse); + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + decode_session6(skb, fl, reverse); + break; +#endif + default: + return -EAFNOSUPPORT; + } + + return security_xfrm_decode_session(skb, &fl->flowi_secid); +} +EXPORT_SYMBOL(__xfrm_decode_session); + +static inline int secpath_has_nontransport(const struct sec_path *sp, int k, int *idxp) +{ + for (; k < sp->len; k++) { + if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) { + *idxp = k; + return 1; + } + } + + return 0; +} + +int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, + unsigned short family) +{ + struct net *net = dev_net(skb->dev); + struct xfrm_policy *pol; + struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX]; + int npols = 0; + int xfrm_nr; + int pi; + int reverse; + struct flowi fl; + int xerr_idx = -1; + const struct xfrm_if_cb *ifcb; + struct sec_path *sp; + u32 if_id = 0; + + rcu_read_lock(); + ifcb = xfrm_if_get_cb(); + + if (ifcb) { + struct xfrm_if_decode_session_result r; + + if (ifcb->decode_session(skb, family, &r)) { + if_id = r.if_id; + net = r.net; + } + } + rcu_read_unlock(); + + reverse = dir & ~XFRM_POLICY_MASK; + dir &= XFRM_POLICY_MASK; + + if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + return 0; + } + + nf_nat_decode_session(skb, &fl, family); + + /* First, check used SA against their selectors. */ + sp = skb_sec_path(skb); + if (sp) { + int i; + + for (i = sp->len - 1; i >= 0; i--) { + struct xfrm_state *x = sp->xvec[i]; + if (!xfrm_selector_match(&x->sel, &fl, family)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); + return 0; + } + } + } + + pol = NULL; + sk = sk_to_full_sk(sk); + if (sk && sk->sk_policy[dir]) { + pol = xfrm_sk_policy_lookup(sk, dir, &fl, family, if_id); + if (IS_ERR(pol)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + return 0; + } + } + + if (!pol) + pol = xfrm_policy_lookup(net, &fl, family, dir, if_id); + + if (IS_ERR(pol)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + return 0; + } + + if (!pol) { + if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); + return 0; + } + + if (sp && secpath_has_nontransport(sp, 0, &xerr_idx)) { + xfrm_secpath_reject(xerr_idx, skb, &fl); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); + return 0; + } + return 1; + } + + /* This lockless write can happen from different cpus. */ + WRITE_ONCE(pol->curlft.use_time, ktime_get_real_seconds()); + + pols[0] = pol; + npols++; +#ifdef CONFIG_XFRM_SUB_POLICY + if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) { + pols[1] = xfrm_policy_lookup_bytype(net, XFRM_POLICY_TYPE_MAIN, + &fl, family, + XFRM_POLICY_IN, if_id); + if (pols[1]) { + if (IS_ERR(pols[1])) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); + xfrm_pol_put(pols[0]); + return 0; + } + /* This write can happen from different cpus. */ + WRITE_ONCE(pols[1]->curlft.use_time, + ktime_get_real_seconds()); + npols++; + } + } +#endif + + if (pol->action == XFRM_POLICY_ALLOW) { + static struct sec_path dummy; + struct xfrm_tmpl *tp[XFRM_MAX_DEPTH]; + struct xfrm_tmpl *stp[XFRM_MAX_DEPTH]; + struct xfrm_tmpl **tpp = tp; + int ti = 0; + int i, k; + + sp = skb_sec_path(skb); + if (!sp) + sp = &dummy; + + for (pi = 0; pi < npols; pi++) { + if (pols[pi] != pol && + pols[pi]->action != XFRM_POLICY_ALLOW) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); + goto reject; + } + if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto reject_error; + } + for (i = 0; i < pols[pi]->xfrm_nr; i++) + tpp[ti++] = &pols[pi]->xfrm_vec[i]; + } + xfrm_nr = ti; + + if (npols > 1) { + xfrm_tmpl_sort(stp, tpp, xfrm_nr, family); + tpp = stp; + } + + /* For each tunnel xfrm, find the first matching tmpl. + * For each tmpl before that, find corresponding xfrm. + * Order is _important_. Later we will implement + * some barriers, but at the moment barriers + * are implied between each two transformations. + * Upon success, marks secpath entries as having been + * verified to allow them to be skipped in future policy + * checks (e.g. nested tunnels). + */ + for (i = xfrm_nr-1, k = 0; i >= 0; i--) { + k = xfrm_policy_ok(tpp[i], sp, k, family, if_id); + if (k < 0) { + if (k < -1) + /* "-2 - errored_index" returned */ + xerr_idx = -(2+k); + XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); + goto reject; + } + } + + if (secpath_has_nontransport(sp, k, &xerr_idx)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINTMPLMISMATCH); + goto reject; + } + + xfrm_pols_put(pols, npols); + sp->verified_cnt = k; + + return 1; + } + XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLBLOCK); + +reject: + xfrm_secpath_reject(xerr_idx, skb, &fl); +reject_error: + xfrm_pols_put(pols, npols); + return 0; +} +EXPORT_SYMBOL(__xfrm_policy_check); + +int __xfrm_route_forward(struct sk_buff *skb, unsigned short family) +{ + struct net *net = dev_net(skb->dev); + struct flowi fl; + struct dst_entry *dst; + int res = 1; + + if (xfrm_decode_session(skb, &fl, family) < 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); + return 0; + } + + skb_dst_force(skb); + if (!skb_dst(skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMFWDHDRERROR); + return 0; + } + + dst = xfrm_lookup(net, skb_dst(skb), &fl, NULL, XFRM_LOOKUP_QUEUE); + if (IS_ERR(dst)) { + res = 0; + dst = NULL; + } + skb_dst_set(skb, dst); + return res; +} +EXPORT_SYMBOL(__xfrm_route_forward); + +/* Optimize later using cookies and generation ids. */ + +static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie) +{ + /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete + * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to + * get validated by dst_ops->check on every use. We do this + * because when a normal route referenced by an XFRM dst is + * obsoleted we do not go looking around for all parent + * referencing XFRM dsts so that we can invalidate them. It + * is just too much work. Instead we make the checks here on + * every use. For example: + * + * XFRM dst A --> IPv4 dst X + * + * X is the "xdst->route" of A (X is also the "dst->path" of A + * in this example). If X is marked obsolete, "A" will not + * notice. That's what we are validating here via the + * stale_bundle() check. + * + * When a dst is removed from the fib tree, DST_OBSOLETE_DEAD will + * be marked on it. + * This will force stale_bundle() to fail on any xdst bundle with + * this dst linked in it. + */ + if (dst->obsolete < 0 && !stale_bundle(dst)) + return dst; + + return NULL; +} + +static int stale_bundle(struct dst_entry *dst) +{ + return !xfrm_bundle_ok((struct xfrm_dst *)dst); +} + +void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev) +{ + while ((dst = xfrm_dst_child(dst)) && dst->xfrm && dst->dev == dev) { + dst->dev = blackhole_netdev; + dev_hold(dst->dev); + dev_put(dev); + } +} +EXPORT_SYMBOL(xfrm_dst_ifdown); + +static void xfrm_link_failure(struct sk_buff *skb) +{ + /* Impossible. Such dst must be popped before reaches point of failure. */ +} + +static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst) +{ + if (dst) { + if (dst->obsolete) { + dst_release(dst); + dst = NULL; + } + } + return dst; +} + +static void xfrm_init_pmtu(struct xfrm_dst **bundle, int nr) +{ + while (nr--) { + struct xfrm_dst *xdst = bundle[nr]; + u32 pmtu, route_mtu_cached; + struct dst_entry *dst; + + dst = &xdst->u.dst; + pmtu = dst_mtu(xfrm_dst_child(dst)); + xdst->child_mtu_cached = pmtu; + + pmtu = xfrm_state_mtu(dst->xfrm, pmtu); + + route_mtu_cached = dst_mtu(xdst->route); + xdst->route_mtu_cached = route_mtu_cached; + + if (pmtu > route_mtu_cached) + pmtu = route_mtu_cached; + + dst_metric_set(dst, RTAX_MTU, pmtu); + } +} + +/* Check that the bundle accepts the flow and its components are + * still valid. + */ + +static int xfrm_bundle_ok(struct xfrm_dst *first) +{ + struct xfrm_dst *bundle[XFRM_MAX_DEPTH]; + struct dst_entry *dst = &first->u.dst; + struct xfrm_dst *xdst; + int start_from, nr; + u32 mtu; + + if (!dst_check(xfrm_dst_path(dst), ((struct xfrm_dst *)dst)->path_cookie) || + (dst->dev && !netif_running(dst->dev))) + return 0; + + if (dst->flags & DST_XFRM_QUEUE) + return 1; + + start_from = nr = 0; + do { + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + + if (dst->xfrm->km.state != XFRM_STATE_VALID) + return 0; + if (xdst->xfrm_genid != dst->xfrm->genid) + return 0; + if (xdst->num_pols > 0 && + xdst->policy_genid != atomic_read(&xdst->pols[0]->genid)) + return 0; + + bundle[nr++] = xdst; + + mtu = dst_mtu(xfrm_dst_child(dst)); + if (xdst->child_mtu_cached != mtu) { + start_from = nr; + xdst->child_mtu_cached = mtu; + } + + if (!dst_check(xdst->route, xdst->route_cookie)) + return 0; + mtu = dst_mtu(xdst->route); + if (xdst->route_mtu_cached != mtu) { + start_from = nr; + xdst->route_mtu_cached = mtu; + } + + dst = xfrm_dst_child(dst); + } while (dst->xfrm); + + if (likely(!start_from)) + return 1; + + xdst = bundle[start_from - 1]; + mtu = xdst->child_mtu_cached; + while (start_from--) { + dst = &xdst->u.dst; + + mtu = xfrm_state_mtu(dst->xfrm, mtu); + if (mtu > xdst->route_mtu_cached) + mtu = xdst->route_mtu_cached; + dst_metric_set(dst, RTAX_MTU, mtu); + if (!start_from) + break; + + xdst = bundle[start_from - 1]; + xdst->child_mtu_cached = mtu; + } + + return 1; +} + +static unsigned int xfrm_default_advmss(const struct dst_entry *dst) +{ + return dst_metric_advmss(xfrm_dst_path(dst)); +} + +static unsigned int xfrm_mtu(const struct dst_entry *dst) +{ + unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); + + return mtu ? : dst_mtu(xfrm_dst_path(dst)); +} + +static const void *xfrm_get_dst_nexthop(const struct dst_entry *dst, + const void *daddr) +{ + while (dst->xfrm) { + const struct xfrm_state *xfrm = dst->xfrm; + + dst = xfrm_dst_child(dst); + + if (xfrm->props.mode == XFRM_MODE_TRANSPORT) + continue; + if (xfrm->type->flags & XFRM_TYPE_REMOTE_COADDR) + daddr = xfrm->coaddr; + else if (!(xfrm->type->flags & XFRM_TYPE_LOCAL_COADDR)) + daddr = &xfrm->id.daddr; + } + return daddr; +} + +static struct neighbour *xfrm_neigh_lookup(const struct dst_entry *dst, + struct sk_buff *skb, + const void *daddr) +{ + const struct dst_entry *path = xfrm_dst_path(dst); + + if (!skb) + daddr = xfrm_get_dst_nexthop(dst, daddr); + return path->ops->neigh_lookup(path, skb, daddr); +} + +static void xfrm_confirm_neigh(const struct dst_entry *dst, const void *daddr) +{ + const struct dst_entry *path = xfrm_dst_path(dst); + + daddr = xfrm_get_dst_nexthop(dst, daddr); + path->ops->confirm_neigh(path, daddr); +} + +int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int family) +{ + int err = 0; + + if (WARN_ON(family >= ARRAY_SIZE(xfrm_policy_afinfo))) + return -EAFNOSUPPORT; + + spin_lock(&xfrm_policy_afinfo_lock); + if (unlikely(xfrm_policy_afinfo[family] != NULL)) + err = -EEXIST; + else { + struct dst_ops *dst_ops = afinfo->dst_ops; + if (likely(dst_ops->kmem_cachep == NULL)) + dst_ops->kmem_cachep = xfrm_dst_cache; + if (likely(dst_ops->check == NULL)) + dst_ops->check = xfrm_dst_check; + if (likely(dst_ops->default_advmss == NULL)) + dst_ops->default_advmss = xfrm_default_advmss; + if (likely(dst_ops->mtu == NULL)) + dst_ops->mtu = xfrm_mtu; + if (likely(dst_ops->negative_advice == NULL)) + dst_ops->negative_advice = xfrm_negative_advice; + if (likely(dst_ops->link_failure == NULL)) + dst_ops->link_failure = xfrm_link_failure; + if (likely(dst_ops->neigh_lookup == NULL)) + dst_ops->neigh_lookup = xfrm_neigh_lookup; + if (likely(!dst_ops->confirm_neigh)) + dst_ops->confirm_neigh = xfrm_confirm_neigh; + rcu_assign_pointer(xfrm_policy_afinfo[family], afinfo); + } + spin_unlock(&xfrm_policy_afinfo_lock); + + return err; +} +EXPORT_SYMBOL(xfrm_policy_register_afinfo); + +void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo) +{ + struct dst_ops *dst_ops = afinfo->dst_ops; + int i; + + for (i = 0; i < ARRAY_SIZE(xfrm_policy_afinfo); i++) { + if (xfrm_policy_afinfo[i] != afinfo) + continue; + RCU_INIT_POINTER(xfrm_policy_afinfo[i], NULL); + break; + } + + synchronize_rcu(); + + dst_ops->kmem_cachep = NULL; + dst_ops->check = NULL; + dst_ops->negative_advice = NULL; + dst_ops->link_failure = NULL; +} +EXPORT_SYMBOL(xfrm_policy_unregister_afinfo); + +void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb) +{ + spin_lock(&xfrm_if_cb_lock); + rcu_assign_pointer(xfrm_if_cb, ifcb); + spin_unlock(&xfrm_if_cb_lock); +} +EXPORT_SYMBOL(xfrm_if_register_cb); + +void xfrm_if_unregister_cb(void) +{ + RCU_INIT_POINTER(xfrm_if_cb, NULL); + synchronize_rcu(); +} +EXPORT_SYMBOL(xfrm_if_unregister_cb); + +#ifdef CONFIG_XFRM_STATISTICS +static int __net_init xfrm_statistics_init(struct net *net) +{ + int rv; + net->mib.xfrm_statistics = alloc_percpu(struct linux_xfrm_mib); + if (!net->mib.xfrm_statistics) + return -ENOMEM; + rv = xfrm_proc_init(net); + if (rv < 0) + free_percpu(net->mib.xfrm_statistics); + return rv; +} + +static void xfrm_statistics_fini(struct net *net) +{ + xfrm_proc_fini(net); + free_percpu(net->mib.xfrm_statistics); +} +#else +static int __net_init xfrm_statistics_init(struct net *net) +{ + return 0; +} + +static void xfrm_statistics_fini(struct net *net) +{ +} +#endif + +static int __net_init xfrm_policy_init(struct net *net) +{ + unsigned int hmask, sz; + int dir, err; + + if (net_eq(net, &init_net)) { + xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache", + sizeof(struct xfrm_dst), + 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, + NULL); + err = rhashtable_init(&xfrm_policy_inexact_table, + &xfrm_pol_inexact_params); + BUG_ON(err); + } + + hmask = 8 - 1; + sz = (hmask+1) * sizeof(struct hlist_head); + + net->xfrm.policy_byidx = xfrm_hash_alloc(sz); + if (!net->xfrm.policy_byidx) + goto out_byidx; + net->xfrm.policy_idx_hmask = hmask; + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy_hash *htab; + + net->xfrm.policy_count[dir] = 0; + net->xfrm.policy_count[XFRM_POLICY_MAX + dir] = 0; + INIT_HLIST_HEAD(&net->xfrm.policy_inexact[dir]); + + htab = &net->xfrm.policy_bydst[dir]; + htab->table = xfrm_hash_alloc(sz); + if (!htab->table) + goto out_bydst; + htab->hmask = hmask; + htab->dbits4 = 32; + htab->sbits4 = 32; + htab->dbits6 = 128; + htab->sbits6 = 128; + } + net->xfrm.policy_hthresh.lbits4 = 32; + net->xfrm.policy_hthresh.rbits4 = 32; + net->xfrm.policy_hthresh.lbits6 = 128; + net->xfrm.policy_hthresh.rbits6 = 128; + + seqlock_init(&net->xfrm.policy_hthresh.lock); + + INIT_LIST_HEAD(&net->xfrm.policy_all); + INIT_LIST_HEAD(&net->xfrm.inexact_bins); + INIT_WORK(&net->xfrm.policy_hash_work, xfrm_hash_resize); + INIT_WORK(&net->xfrm.policy_hthresh.work, xfrm_hash_rebuild); + return 0; + +out_bydst: + for (dir--; dir >= 0; dir--) { + struct xfrm_policy_hash *htab; + + htab = &net->xfrm.policy_bydst[dir]; + xfrm_hash_free(htab->table, sz); + } + xfrm_hash_free(net->xfrm.policy_byidx, sz); +out_byidx: + return -ENOMEM; +} + +static void xfrm_policy_fini(struct net *net) +{ + struct xfrm_pol_inexact_bin *b, *t; + unsigned int sz; + int dir; + + flush_work(&net->xfrm.policy_hash_work); +#ifdef CONFIG_XFRM_SUB_POLICY + xfrm_policy_flush(net, XFRM_POLICY_TYPE_SUB, false); +#endif + xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, false); + + WARN_ON(!list_empty(&net->xfrm.policy_all)); + + for (dir = 0; dir < XFRM_POLICY_MAX; dir++) { + struct xfrm_policy_hash *htab; + + WARN_ON(!hlist_empty(&net->xfrm.policy_inexact[dir])); + + htab = &net->xfrm.policy_bydst[dir]; + sz = (htab->hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(htab->table)); + xfrm_hash_free(htab->table, sz); + } + + sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(net->xfrm.policy_byidx)); + xfrm_hash_free(net->xfrm.policy_byidx, sz); + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + list_for_each_entry_safe(b, t, &net->xfrm.inexact_bins, inexact_bins) + __xfrm_policy_inexact_prune_bin(b, true); + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); +} + +static int __net_init xfrm_net_init(struct net *net) +{ + int rv; + + /* Initialize the per-net locks here */ + spin_lock_init(&net->xfrm.xfrm_state_lock); + spin_lock_init(&net->xfrm.xfrm_policy_lock); + seqcount_spinlock_init(&net->xfrm.xfrm_policy_hash_generation, &net->xfrm.xfrm_policy_lock); + mutex_init(&net->xfrm.xfrm_cfg_mutex); + net->xfrm.policy_default[XFRM_POLICY_IN] = XFRM_USERPOLICY_ACCEPT; + net->xfrm.policy_default[XFRM_POLICY_FWD] = XFRM_USERPOLICY_ACCEPT; + net->xfrm.policy_default[XFRM_POLICY_OUT] = XFRM_USERPOLICY_ACCEPT; + + rv = xfrm_statistics_init(net); + if (rv < 0) + goto out_statistics; + rv = xfrm_state_init(net); + if (rv < 0) + goto out_state; + rv = xfrm_policy_init(net); + if (rv < 0) + goto out_policy; + rv = xfrm_sysctl_init(net); + if (rv < 0) + goto out_sysctl; + + return 0; + +out_sysctl: + xfrm_policy_fini(net); +out_policy: + xfrm_state_fini(net); +out_state: + xfrm_statistics_fini(net); +out_statistics: + return rv; +} + +static void __net_exit xfrm_net_exit(struct net *net) +{ + xfrm_sysctl_fini(net); + xfrm_policy_fini(net); + xfrm_state_fini(net); + xfrm_statistics_fini(net); +} + +static struct pernet_operations __net_initdata xfrm_net_ops = { + .init = xfrm_net_init, + .exit = xfrm_net_exit, +}; + +void __init xfrm_init(void) +{ + register_pernet_subsys(&xfrm_net_ops); + xfrm_dev_init(); + xfrm_input_init(); + +#ifdef CONFIG_XFRM_ESPINTCP + espintcp_init(); +#endif +} + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp, + struct audit_buffer *audit_buf) +{ + struct xfrm_sec_ctx *ctx = xp->security; + struct xfrm_selector *sel = &xp->selector; + + if (ctx) + audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); + + switch (sel->family) { + case AF_INET: + audit_log_format(audit_buf, " src=%pI4", &sel->saddr.a4); + if (sel->prefixlen_s != 32) + audit_log_format(audit_buf, " src_prefixlen=%d", + sel->prefixlen_s); + audit_log_format(audit_buf, " dst=%pI4", &sel->daddr.a4); + if (sel->prefixlen_d != 32) + audit_log_format(audit_buf, " dst_prefixlen=%d", + sel->prefixlen_d); + break; + case AF_INET6: + audit_log_format(audit_buf, " src=%pI6", sel->saddr.a6); + if (sel->prefixlen_s != 128) + audit_log_format(audit_buf, " src_prefixlen=%d", + sel->prefixlen_s); + audit_log_format(audit_buf, " dst=%pI6", sel->daddr.a6); + if (sel->prefixlen_d != 128) + audit_log_format(audit_buf, " dst_prefixlen=%d", + sel->prefixlen_d); + break; + } +} + +void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SPD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + xfrm_audit_common_policyinfo(xp, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_policy_add); + +void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, + bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SPD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + xfrm_audit_common_policyinfo(xp, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete); +#endif + +#ifdef CONFIG_XFRM_MIGRATE +static bool xfrm_migrate_selector_match(const struct xfrm_selector *sel_cmp, + const struct xfrm_selector *sel_tgt) +{ + if (sel_cmp->proto == IPSEC_ULPROTO_ANY) { + if (sel_tgt->family == sel_cmp->family && + xfrm_addr_equal(&sel_tgt->daddr, &sel_cmp->daddr, + sel_cmp->family) && + xfrm_addr_equal(&sel_tgt->saddr, &sel_cmp->saddr, + sel_cmp->family) && + sel_tgt->prefixlen_d == sel_cmp->prefixlen_d && + sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) { + return true; + } + } else { + if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) { + return true; + } + } + return false; +} + +static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *sel, + u8 dir, u8 type, struct net *net, u32 if_id) +{ + struct xfrm_policy *pol, *ret = NULL; + struct hlist_head *chain; + u32 priority = ~0U; + + spin_lock_bh(&net->xfrm.xfrm_policy_lock); + chain = policy_hash_direct(net, &sel->daddr, &sel->saddr, sel->family, dir); + hlist_for_each_entry(pol, chain, bydst) { + if ((if_id == 0 || pol->if_id == if_id) && + xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type) { + ret = pol; + priority = ret->priority; + break; + } + } + chain = &net->xfrm.policy_inexact[dir]; + hlist_for_each_entry(pol, chain, bydst_inexact_list) { + if ((pol->priority >= priority) && ret) + break; + + if ((if_id == 0 || pol->if_id == if_id) && + xfrm_migrate_selector_match(sel, &pol->selector) && + pol->type == type) { + ret = pol; + break; + } + } + + xfrm_pol_hold(ret); + + spin_unlock_bh(&net->xfrm.xfrm_policy_lock); + + return ret; +} + +static int migrate_tmpl_match(const struct xfrm_migrate *m, const struct xfrm_tmpl *t) +{ + int match = 0; + + if (t->mode == m->mode && t->id.proto == m->proto && + (m->reqid == 0 || t->reqid == m->reqid)) { + switch (t->mode) { + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + if (xfrm_addr_equal(&t->id.daddr, &m->old_daddr, + m->old_family) && + xfrm_addr_equal(&t->saddr, &m->old_saddr, + m->old_family)) { + match = 1; + } + break; + case XFRM_MODE_TRANSPORT: + /* in case of transport mode, template does not store + any IP addresses, hence we just compare mode and + protocol */ + match = 1; + break; + default: + break; + } + } + return match; +} + +/* update endpoint address(es) of template(s) */ +static int xfrm_policy_migrate(struct xfrm_policy *pol, + struct xfrm_migrate *m, int num_migrate) +{ + struct xfrm_migrate *mp; + int i, j, n = 0; + + write_lock_bh(&pol->lock); + if (unlikely(pol->walk.dead)) { + /* target policy has been deleted */ + write_unlock_bh(&pol->lock); + return -ENOENT; + } + + for (i = 0; i < pol->xfrm_nr; i++) { + for (j = 0, mp = m; j < num_migrate; j++, mp++) { + if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i])) + continue; + n++; + if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL && + pol->xfrm_vec[i].mode != XFRM_MODE_BEET) + continue; + /* update endpoints */ + memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr, + sizeof(pol->xfrm_vec[i].id.daddr)); + memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr, + sizeof(pol->xfrm_vec[i].saddr)); + pol->xfrm_vec[i].encap_family = mp->new_family; + /* flush bundles */ + atomic_inc(&pol->genid); + } + } + + write_unlock_bh(&pol->lock); + + if (!n) + return -ENODATA; + + return 0; +} + +static int xfrm_migrate_check(const struct xfrm_migrate *m, int num_migrate) +{ + int i, j; + + if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < num_migrate; i++) { + if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) || + xfrm_addr_any(&m[i].new_saddr, m[i].new_family)) + return -EINVAL; + + /* check if there is any duplicated entry */ + for (j = i + 1; j < num_migrate; j++) { + if (!memcmp(&m[i].old_daddr, &m[j].old_daddr, + sizeof(m[i].old_daddr)) && + !memcmp(&m[i].old_saddr, &m[j].old_saddr, + sizeof(m[i].old_saddr)) && + m[i].proto == m[j].proto && + m[i].mode == m[j].mode && + m[i].reqid == m[j].reqid && + m[i].old_family == m[j].old_family) + return -EINVAL; + } + } + + return 0; +} + +int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + struct xfrm_migrate *m, int num_migrate, + struct xfrm_kmaddress *k, struct net *net, + struct xfrm_encap_tmpl *encap, u32 if_id) +{ + int i, err, nx_cur = 0, nx_new = 0; + struct xfrm_policy *pol = NULL; + struct xfrm_state *x, *xc; + struct xfrm_state *x_cur[XFRM_MAX_DEPTH]; + struct xfrm_state *x_new[XFRM_MAX_DEPTH]; + struct xfrm_migrate *mp; + + /* Stage 0 - sanity checks */ + if ((err = xfrm_migrate_check(m, num_migrate)) < 0) + goto out; + + if (dir >= XFRM_POLICY_MAX) { + err = -EINVAL; + goto out; + } + + /* Stage 1 - find policy */ + if ((pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id)) == NULL) { + err = -ENOENT; + goto out; + } + + /* Stage 2 - find and update state(s) */ + for (i = 0, mp = m; i < num_migrate; i++, mp++) { + if ((x = xfrm_migrate_state_find(mp, net, if_id))) { + x_cur[nx_cur] = x; + nx_cur++; + xc = xfrm_state_migrate(x, mp, encap); + if (xc) { + x_new[nx_new] = xc; + nx_new++; + } else { + err = -ENODATA; + goto restore_state; + } + } + } + + /* Stage 3 - update policy */ + if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0) + goto restore_state; + + /* Stage 4 - delete old state(s) */ + if (nx_cur) { + xfrm_states_put(x_cur, nx_cur); + xfrm_states_delete(x_cur, nx_cur); + } + + /* Stage 5 - announce */ + km_migrate(sel, dir, type, m, num_migrate, k, encap); + + xfrm_pol_put(pol); + + return 0; +out: + return err; + +restore_state: + if (pol) + xfrm_pol_put(pol); + if (nx_cur) + xfrm_states_put(x_cur, nx_cur); + if (nx_new) + xfrm_states_delete(x_new, nx_new); + + return err; +} +EXPORT_SYMBOL(xfrm_migrate); +#endif diff --git a/net/xfrm/xfrm_proc.c b/net/xfrm/xfrm_proc.c new file mode 100644 index 000000000..fee9b5cf3 --- /dev/null +++ b/net/xfrm/xfrm_proc.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * xfrm_proc.c + * + * Copyright (C)2006-2007 USAGI/WIDE Project + * + * Authors: Masahide NAKAMURA + */ +#include +#include +#include +#include +#include + +static const struct snmp_mib xfrm_mib_list[] = { + SNMP_MIB_ITEM("XfrmInError", LINUX_MIB_XFRMINERROR), + SNMP_MIB_ITEM("XfrmInBufferError", LINUX_MIB_XFRMINBUFFERERROR), + SNMP_MIB_ITEM("XfrmInHdrError", LINUX_MIB_XFRMINHDRERROR), + SNMP_MIB_ITEM("XfrmInNoStates", LINUX_MIB_XFRMINNOSTATES), + SNMP_MIB_ITEM("XfrmInStateProtoError", LINUX_MIB_XFRMINSTATEPROTOERROR), + SNMP_MIB_ITEM("XfrmInStateModeError", LINUX_MIB_XFRMINSTATEMODEERROR), + SNMP_MIB_ITEM("XfrmInStateSeqError", LINUX_MIB_XFRMINSTATESEQERROR), + SNMP_MIB_ITEM("XfrmInStateExpired", LINUX_MIB_XFRMINSTATEEXPIRED), + SNMP_MIB_ITEM("XfrmInStateMismatch", LINUX_MIB_XFRMINSTATEMISMATCH), + SNMP_MIB_ITEM("XfrmInStateInvalid", LINUX_MIB_XFRMINSTATEINVALID), + SNMP_MIB_ITEM("XfrmInTmplMismatch", LINUX_MIB_XFRMINTMPLMISMATCH), + SNMP_MIB_ITEM("XfrmInNoPols", LINUX_MIB_XFRMINNOPOLS), + SNMP_MIB_ITEM("XfrmInPolBlock", LINUX_MIB_XFRMINPOLBLOCK), + SNMP_MIB_ITEM("XfrmInPolError", LINUX_MIB_XFRMINPOLERROR), + SNMP_MIB_ITEM("XfrmOutError", LINUX_MIB_XFRMOUTERROR), + SNMP_MIB_ITEM("XfrmOutBundleGenError", LINUX_MIB_XFRMOUTBUNDLEGENERROR), + SNMP_MIB_ITEM("XfrmOutBundleCheckError", LINUX_MIB_XFRMOUTBUNDLECHECKERROR), + SNMP_MIB_ITEM("XfrmOutNoStates", LINUX_MIB_XFRMOUTNOSTATES), + SNMP_MIB_ITEM("XfrmOutStateProtoError", LINUX_MIB_XFRMOUTSTATEPROTOERROR), + SNMP_MIB_ITEM("XfrmOutStateModeError", LINUX_MIB_XFRMOUTSTATEMODEERROR), + SNMP_MIB_ITEM("XfrmOutStateSeqError", LINUX_MIB_XFRMOUTSTATESEQERROR), + SNMP_MIB_ITEM("XfrmOutStateExpired", LINUX_MIB_XFRMOUTSTATEEXPIRED), + SNMP_MIB_ITEM("XfrmOutPolBlock", LINUX_MIB_XFRMOUTPOLBLOCK), + SNMP_MIB_ITEM("XfrmOutPolDead", LINUX_MIB_XFRMOUTPOLDEAD), + SNMP_MIB_ITEM("XfrmOutPolError", LINUX_MIB_XFRMOUTPOLERROR), + SNMP_MIB_ITEM("XfrmFwdHdrError", LINUX_MIB_XFRMFWDHDRERROR), + SNMP_MIB_ITEM("XfrmOutStateInvalid", LINUX_MIB_XFRMOUTSTATEINVALID), + SNMP_MIB_ITEM("XfrmAcquireError", LINUX_MIB_XFRMACQUIREERROR), + SNMP_MIB_SENTINEL +}; + +static int xfrm_statistics_seq_show(struct seq_file *seq, void *v) +{ + unsigned long buff[LINUX_MIB_XFRMMAX]; + struct net *net = seq->private; + int i; + + memset(buff, 0, sizeof(unsigned long) * LINUX_MIB_XFRMMAX); + + snmp_get_cpu_field_batch(buff, xfrm_mib_list, + net->mib.xfrm_statistics); + for (i = 0; xfrm_mib_list[i].name; i++) + seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name, + buff[i]); + + return 0; +} + +int __net_init xfrm_proc_init(struct net *net) +{ + if (!proc_create_net_single("xfrm_stat", 0444, net->proc_net, + xfrm_statistics_seq_show, NULL)) + return -ENOMEM; + return 0; +} + +void xfrm_proc_fini(struct net *net) +{ + remove_proc_entry("xfrm_stat", net->proc_net); +} diff --git a/net/xfrm/xfrm_replay.c b/net/xfrm/xfrm_replay.c new file mode 100644 index 000000000..ce56d659c --- /dev/null +++ b/net/xfrm/xfrm_replay.c @@ -0,0 +1,795 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * xfrm_replay.c - xfrm replay detection, derived from xfrm_state.c. + * + * Copyright (C) 2010 secunet Security Networks AG + * Copyright (C) 2010 Steffen Klassert + */ + +#include +#include + +u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq) +{ + u32 seq, seq_hi, bottom; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (!(x->props.flags & XFRM_STATE_ESN)) + return 0; + + seq = ntohl(net_seq); + seq_hi = replay_esn->seq_hi; + bottom = replay_esn->seq - replay_esn->replay_window + 1; + + if (likely(replay_esn->seq >= replay_esn->replay_window - 1)) { + /* A. same subspace */ + if (unlikely(seq < bottom)) + seq_hi++; + } else { + /* B. window spans two subspaces */ + if (unlikely(seq >= bottom)) + seq_hi--; + } + + return seq_hi; +} +EXPORT_SYMBOL(xfrm_replay_seqhi); + +static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event); +static void xfrm_replay_notify_esn(struct xfrm_state *x, int event); + +void xfrm_replay_notify(struct xfrm_state *x, int event) +{ + struct km_event c; + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + xfrm_replay_notify_bmp(x, event); + return; + case XFRM_REPLAY_MODE_ESN: + xfrm_replay_notify_esn(x, event); + return; + } + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (!x->replay_maxdiff || + ((x->replay.seq - x->preplay.seq < x->replay_maxdiff) && + (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff))) { + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + } + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(&x->replay, &x->preplay, + sizeof(struct xfrm_replay_state)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static int __xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++x->replay.oseq; + XFRM_SKB_CB(skb)->seq.output.hi = 0; + if (unlikely(x->replay.oseq == 0) && + !(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) { + x->replay.oseq--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check_legacy(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + u32 diff; + u32 seq = ntohl(net_seq); + + if (!x->props.replay_window) + return 0; + + if (unlikely(seq == 0)) + goto err; + + if (likely(seq > x->replay.seq)) + return 0; + + diff = x->replay.seq - seq; + if (diff >= x->props.replay_window) { + x->stats.replay_window++; + goto err; + } + + if (x->replay.bitmap & (1U << diff)) { + x->stats.replay++; + goto err; + } + return 0; + +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq); +static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq); + +void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) +{ + u32 diff, seq; + + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + return xfrm_replay_advance_bmp(x, net_seq); + case XFRM_REPLAY_MODE_ESN: + return xfrm_replay_advance_esn(x, net_seq); + } + + if (!x->props.replay_window) + return; + + seq = ntohl(net_seq); + if (seq > x->replay.seq) { + diff = seq - x->replay.seq; + if (diff < x->props.replay_window) + x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; + else + x->replay.bitmap = 1; + x->replay.seq = seq; + } else { + diff = x->replay.seq - seq; + x->replay.bitmap |= (1U << diff); + } + + if (xfrm_aevent_is_on(xs_net(x))) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); +} + +static int xfrm_replay_overflow_bmp(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq; + XFRM_SKB_CB(skb)->seq.output.hi = 0; + if (unlikely(replay_esn->oseq == 0) && + !(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) { + replay_esn->oseq--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check_bmp(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + unsigned int bitnr, nr; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 pos; + u32 seq = ntohl(net_seq); + u32 diff = replay_esn->seq - seq; + + if (!replay_esn->replay_window) + return 0; + + if (unlikely(seq == 0)) + goto err; + + if (likely(seq > replay_esn->seq)) + return 0; + + if (diff >= replay_esn->replay_window) { + x->stats.replay_window++; + goto err; + } + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + if (replay_esn->bmp[nr] & (1U << bitnr)) + goto err_replay; + + return 0; + +err_replay: + x->stats.replay++; +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +static void xfrm_replay_advance_bmp(struct xfrm_state *x, __be32 net_seq) +{ + unsigned int bitnr, nr, i; + u32 diff; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 seq = ntohl(net_seq); + u32 pos; + + if (!replay_esn->replay_window) + return; + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (seq > replay_esn->seq) { + diff = seq - replay_esn->seq; + + if (diff < replay_esn->replay_window) { + for (i = 1; i < diff; i++) { + bitnr = (pos + i) % replay_esn->replay_window; + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] &= ~(1U << bitnr); + } + } else { + nr = (replay_esn->replay_window - 1) >> 5; + for (i = 0; i <= nr; i++) + replay_esn->bmp[i] = 0; + } + + bitnr = (pos + diff) % replay_esn->replay_window; + replay_esn->seq = seq; + } else { + diff = replay_esn->seq - seq; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + } + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] |= (1U << bitnr); + + if (xfrm_aevent_is_on(xs_net(x))) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); +} + +static void xfrm_replay_notify_bmp(struct xfrm_state *x, int event) +{ + struct km_event c; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn; + + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (!x->replay_maxdiff || + ((replay_esn->seq - preplay_esn->seq < x->replay_maxdiff) && + (replay_esn->oseq - preplay_esn->oseq + < x->replay_maxdiff))) { + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + } + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(x->replay_esn, x->preplay_esn, + xfrm_replay_state_esn_len(replay_esn)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(x->preplay_esn, x->replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static void xfrm_replay_notify_esn(struct xfrm_state *x, int event) +{ + u32 seq_diff, oseq_diff; + struct km_event c; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct xfrm_replay_state_esn *preplay_esn = x->preplay_esn; + + /* we send notify messages in case + * 1. we updated on of the sequence numbers, and the seqno difference + * is at least x->replay_maxdiff, in this case we also update the + * timeout of our timer function + * 2. if x->replay_maxage has elapsed since last update, + * and there were changes + * + * The state structure must be locked! + */ + + switch (event) { + case XFRM_REPLAY_UPDATE: + if (x->replay_maxdiff) { + if (replay_esn->seq_hi == preplay_esn->seq_hi) + seq_diff = replay_esn->seq - preplay_esn->seq; + else + seq_diff = ~preplay_esn->seq + replay_esn->seq + + 1; + + if (replay_esn->oseq_hi == preplay_esn->oseq_hi) + oseq_diff = replay_esn->oseq + - preplay_esn->oseq; + else + oseq_diff = ~preplay_esn->oseq + + replay_esn->oseq + 1; + + if (seq_diff >= x->replay_maxdiff || + oseq_diff >= x->replay_maxdiff) + break; + } + + if (x->xflags & XFRM_TIME_DEFER) + event = XFRM_REPLAY_TIMEOUT; + else + return; + + break; + + case XFRM_REPLAY_TIMEOUT: + if (memcmp(x->replay_esn, x->preplay_esn, + xfrm_replay_state_esn_len(replay_esn)) == 0) { + x->xflags |= XFRM_TIME_DEFER; + return; + } + + break; + } + + memcpy(x->preplay_esn, x->replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + c.event = XFRM_MSG_NEWAE; + c.data.aevent = event; + km_state_notify(x, &c); + + if (x->replay_maxage && + !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) + x->xflags &= ~XFRM_TIME_DEFER; +} + +static int xfrm_replay_overflow_esn(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + XFRM_SKB_CB(skb)->seq.output.low = ++replay_esn->oseq; + XFRM_SKB_CB(skb)->seq.output.hi = replay_esn->oseq_hi; + + if (unlikely(replay_esn->oseq == 0)) { + XFRM_SKB_CB(skb)->seq.output.hi = ++replay_esn->oseq_hi; + + if (replay_esn->oseq_hi == 0) { + replay_esn->oseq--; + replay_esn->oseq_hi--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + } + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_check_esn(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + unsigned int bitnr, nr; + u32 diff; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + u32 pos; + u32 seq = ntohl(net_seq); + u32 wsize = replay_esn->replay_window; + u32 top = replay_esn->seq; + u32 bottom = top - wsize + 1; + + if (!wsize) + return 0; + + if (unlikely(seq == 0 && replay_esn->seq_hi == 0 && + (replay_esn->seq < replay_esn->replay_window - 1))) + goto err; + + diff = top - seq; + + if (likely(top >= wsize - 1)) { + /* A. same subspace */ + if (likely(seq > top) || seq < bottom) + return 0; + } else { + /* B. window spans two subspaces */ + if (likely(seq > top && seq < bottom)) + return 0; + if (seq >= bottom) + diff = ~seq + top + 1; + } + + if (diff >= replay_esn->replay_window) { + x->stats.replay_window++; + goto err; + } + + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + if (replay_esn->bmp[nr] & (1U << bitnr)) + goto err_replay; + + return 0; + +err_replay: + x->stats.replay++; +err: + xfrm_audit_state_replay(x, skb, net_seq); + return -EINVAL; +} + +int xfrm_replay_check(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + return xfrm_replay_check_bmp(x, skb, net_seq); + case XFRM_REPLAY_MODE_ESN: + return xfrm_replay_check_esn(x, skb, net_seq); + } + + return xfrm_replay_check_legacy(x, skb, net_seq); +} + +static int xfrm_replay_recheck_esn(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + if (unlikely(XFRM_SKB_CB(skb)->seq.input.hi != + htonl(xfrm_replay_seqhi(x, net_seq)))) { + x->stats.replay_window++; + return -EINVAL; + } + + return xfrm_replay_check_esn(x, skb, net_seq); +} + +int xfrm_replay_recheck(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + /* no special recheck treatment */ + return xfrm_replay_check_bmp(x, skb, net_seq); + case XFRM_REPLAY_MODE_ESN: + return xfrm_replay_recheck_esn(x, skb, net_seq); + } + + return xfrm_replay_check_legacy(x, skb, net_seq); +} + +static void xfrm_replay_advance_esn(struct xfrm_state *x, __be32 net_seq) +{ + unsigned int bitnr, nr, i; + int wrap; + u32 diff, pos, seq, seq_hi; + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (!replay_esn->replay_window) + return; + + seq = ntohl(net_seq); + pos = (replay_esn->seq - 1) % replay_esn->replay_window; + seq_hi = xfrm_replay_seqhi(x, net_seq); + wrap = seq_hi - replay_esn->seq_hi; + + if ((!wrap && seq > replay_esn->seq) || wrap > 0) { + if (likely(!wrap)) + diff = seq - replay_esn->seq; + else + diff = ~replay_esn->seq + seq + 1; + + if (diff < replay_esn->replay_window) { + for (i = 1; i < diff; i++) { + bitnr = (pos + i) % replay_esn->replay_window; + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] &= ~(1U << bitnr); + } + } else { + nr = (replay_esn->replay_window - 1) >> 5; + for (i = 0; i <= nr; i++) + replay_esn->bmp[i] = 0; + } + + bitnr = (pos + diff) % replay_esn->replay_window; + replay_esn->seq = seq; + + if (unlikely(wrap > 0)) + replay_esn->seq_hi++; + } else { + diff = replay_esn->seq - seq; + + if (pos >= diff) + bitnr = (pos - diff) % replay_esn->replay_window; + else + bitnr = replay_esn->replay_window - (diff - pos); + } + + xfrm_dev_state_advance_esn(x); + + nr = bitnr >> 5; + bitnr = bitnr & 0x1F; + replay_esn->bmp[nr] |= (1U << bitnr); + + if (xfrm_aevent_is_on(xs_net(x))) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); +} + +#ifdef CONFIG_XFRM_OFFLOAD +static int xfrm_replay_overflow_offload(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct net *net = xs_net(x); + struct xfrm_offload *xo = xfrm_offload(skb); + __u32 oseq = x->replay.oseq; + + if (!xo) + return __xfrm_replay_overflow(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + xo->seq.low = oseq; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + xo->seq.low = oseq + 1; + oseq += skb_shinfo(skb)->gso_segs; + } + + XFRM_SKB_CB(skb)->seq.output.hi = 0; + xo->seq.hi = 0; + if (unlikely(oseq < x->replay.oseq) && + !(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) { + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + + x->replay.oseq = oseq; + + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_overflow_offload_bmp(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_offload *xo = xfrm_offload(skb); + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + __u32 oseq = replay_esn->oseq; + + if (!xo) + return xfrm_replay_overflow_bmp(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + xo->seq.low = oseq; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + xo->seq.low = oseq + 1; + oseq += skb_shinfo(skb)->gso_segs; + } + + XFRM_SKB_CB(skb)->seq.output.hi = 0; + xo->seq.hi = 0; + if (unlikely(oseq < replay_esn->oseq) && + !(x->props.extra_flags & XFRM_SA_XFLAG_OSEQ_MAY_WRAP)) { + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } else { + replay_esn->oseq = oseq; + } + + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff *skb) +{ + int err = 0; + struct xfrm_offload *xo = xfrm_offload(skb); + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + struct net *net = xs_net(x); + __u32 oseq = replay_esn->oseq; + __u32 oseq_hi = replay_esn->oseq_hi; + + if (!xo) + return xfrm_replay_overflow_esn(x, skb); + + if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { + if (!skb_is_gso(skb)) { + XFRM_SKB_CB(skb)->seq.output.low = ++oseq; + XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi; + xo->seq.low = oseq; + xo->seq.hi = oseq_hi; + } else { + XFRM_SKB_CB(skb)->seq.output.low = oseq + 1; + XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi; + xo->seq.low = oseq + 1; + xo->seq.hi = oseq_hi; + oseq += skb_shinfo(skb)->gso_segs; + } + + if (unlikely(xo->seq.low < replay_esn->oseq)) { + XFRM_SKB_CB(skb)->seq.output.hi = ++oseq_hi; + xo->seq.hi = oseq_hi; + replay_esn->oseq_hi = oseq_hi; + if (replay_esn->oseq_hi == 0) { + replay_esn->oseq--; + replay_esn->oseq_hi--; + xfrm_audit_state_replay_overflow(x, skb); + err = -EOVERFLOW; + + return err; + } + } + + replay_esn->oseq = oseq; + + if (xfrm_aevent_is_on(net)) + xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); + } + + return err; +} + +int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb) +{ + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + return xfrm_replay_overflow_offload_bmp(x, skb); + case XFRM_REPLAY_MODE_ESN: + return xfrm_replay_overflow_offload_esn(x, skb); + } + + return xfrm_replay_overflow_offload(x, skb); +} +#else +int xfrm_replay_overflow(struct xfrm_state *x, struct sk_buff *skb) +{ + switch (x->repl_mode) { + case XFRM_REPLAY_MODE_LEGACY: + break; + case XFRM_REPLAY_MODE_BMP: + return xfrm_replay_overflow_bmp(x, skb); + case XFRM_REPLAY_MODE_ESN: + return xfrm_replay_overflow_esn(x, skb); + } + + return __xfrm_replay_overflow(x, skb); +} +#endif + +int xfrm_init_replay(struct xfrm_state *x, struct netlink_ext_ack *extack) +{ + struct xfrm_replay_state_esn *replay_esn = x->replay_esn; + + if (replay_esn) { + if (replay_esn->replay_window > + replay_esn->bmp_len * sizeof(__u32) * 8) { + NL_SET_ERR_MSG(extack, "ESN replay window is too large for the chosen bitmap size"); + return -EINVAL; + } + + if (x->props.flags & XFRM_STATE_ESN) { + if (replay_esn->replay_window == 0) { + NL_SET_ERR_MSG(extack, "ESN replay window must be > 0"); + return -EINVAL; + } + x->repl_mode = XFRM_REPLAY_MODE_ESN; + } else { + x->repl_mode = XFRM_REPLAY_MODE_BMP; + } + } else { + x->repl_mode = XFRM_REPLAY_MODE_LEGACY; + } + + return 0; +} +EXPORT_SYMBOL(xfrm_init_replay); diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c new file mode 100644 index 000000000..2f4cf976b --- /dev/null +++ b/net/xfrm/xfrm_state.c @@ -0,0 +1,2933 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * xfrm_state.c + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * YOSHIFUJI Hideaki @USAGI + * Split up af-specific functions + * Derek Atkins + * Add UDP Encapsulation + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "xfrm_hash.h" + +#define xfrm_state_deref_prot(table, net) \ + rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock)) + +static void xfrm_state_gc_task(struct work_struct *work); + +/* Each xfrm_state may be linked to two tables: + + 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) + 2. Hash table by (daddr,family,reqid) to find what SAs exist for given + destination/tunnel endpoint. (output) + */ + +static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; +static struct kmem_cache *xfrm_state_cache __ro_after_init; + +static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task); +static HLIST_HEAD(xfrm_state_gc_list); + +static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x) +{ + return refcount_inc_not_zero(&x->refcnt); +} + +static inline unsigned int xfrm_dst_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u32 reqid, + unsigned short family) +{ + return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask); +} + +static inline unsigned int xfrm_src_hash(struct net *net, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + unsigned short family) +{ + return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask); +} + +static inline unsigned int +xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr, + __be32 spi, u8 proto, unsigned short family) +{ + return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask); +} + +static unsigned int xfrm_seq_hash(struct net *net, u32 seq) +{ + return __xfrm_seq_hash(seq, net->xfrm.state_hmask); +} + +static void xfrm_hash_transfer(struct hlist_head *list, + struct hlist_head *ndsttable, + struct hlist_head *nsrctable, + struct hlist_head *nspitable, + struct hlist_head *nseqtable, + unsigned int nhashmask) +{ + struct hlist_node *tmp; + struct xfrm_state *x; + + hlist_for_each_entry_safe(x, tmp, list, bydst) { + unsigned int h; + + h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family, + nhashmask); + hlist_add_head_rcu(&x->bydst, ndsttable + h); + + h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, + x->props.family, + nhashmask); + hlist_add_head_rcu(&x->bysrc, nsrctable + h); + + if (x->id.spi) { + h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, + x->id.proto, x->props.family, + nhashmask); + hlist_add_head_rcu(&x->byspi, nspitable + h); + } + + if (x->km.seq) { + h = __xfrm_seq_hash(x->km.seq, nhashmask); + hlist_add_head_rcu(&x->byseq, nseqtable + h); + } + } +} + +static unsigned long xfrm_hash_new_size(unsigned int state_hmask) +{ + return ((state_hmask + 1) << 1) * sizeof(struct hlist_head); +} + +static void xfrm_hash_resize(struct work_struct *work) +{ + struct net *net = container_of(work, struct net, xfrm.state_hash_work); + struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq; + unsigned long nsize, osize; + unsigned int nhashmask, ohashmask; + int i; + + nsize = xfrm_hash_new_size(net->xfrm.state_hmask); + ndst = xfrm_hash_alloc(nsize); + if (!ndst) + return; + nsrc = xfrm_hash_alloc(nsize); + if (!nsrc) { + xfrm_hash_free(ndst, nsize); + return; + } + nspi = xfrm_hash_alloc(nsize); + if (!nspi) { + xfrm_hash_free(ndst, nsize); + xfrm_hash_free(nsrc, nsize); + return; + } + nseq = xfrm_hash_alloc(nsize); + if (!nseq) { + xfrm_hash_free(ndst, nsize); + xfrm_hash_free(nsrc, nsize); + xfrm_hash_free(nspi, nsize); + return; + } + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); + + nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; + odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net); + for (i = net->xfrm.state_hmask; i >= 0; i--) + xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask); + + osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net); + ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net); + oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net); + ohashmask = net->xfrm.state_hmask; + + rcu_assign_pointer(net->xfrm.state_bydst, ndst); + rcu_assign_pointer(net->xfrm.state_bysrc, nsrc); + rcu_assign_pointer(net->xfrm.state_byspi, nspi); + rcu_assign_pointer(net->xfrm.state_byseq, nseq); + net->xfrm.state_hmask = nhashmask; + + write_seqcount_end(&net->xfrm.xfrm_state_hash_generation); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + osize = (ohashmask + 1) * sizeof(struct hlist_head); + + synchronize_rcu(); + + xfrm_hash_free(odst, osize); + xfrm_hash_free(osrc, osize); + xfrm_hash_free(ospi, osize); + xfrm_hash_free(oseq, osize); +} + +static DEFINE_SPINLOCK(xfrm_state_afinfo_lock); +static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO]; + +static DEFINE_SPINLOCK(xfrm_state_gc_lock); + +int __xfrm_state_delete(struct xfrm_state *x); + +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); +static bool km_is_alive(const struct km_event *c); +void km_state_expired(struct xfrm_state *x, int hard, u32 portid); + +int xfrm_register_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + int err = 0; + + if (!afinfo) + return -EAFNOSUPPORT; + +#define X(afi, T, name) do { \ + WARN_ON((afi)->type_ ## name); \ + (afi)->type_ ## name = (T); \ + } while (0) + + switch (type->proto) { + case IPPROTO_COMP: + X(afinfo, type, comp); + break; + case IPPROTO_AH: + X(afinfo, type, ah); + break; + case IPPROTO_ESP: + X(afinfo, type, esp); + break; + case IPPROTO_IPIP: + X(afinfo, type, ipip); + break; + case IPPROTO_DSTOPTS: + X(afinfo, type, dstopts); + break; + case IPPROTO_ROUTING: + X(afinfo, type, routing); + break; + case IPPROTO_IPV6: + X(afinfo, type, ipip6); + break; + default: + WARN_ON(1); + err = -EPROTONOSUPPORT; + break; + } +#undef X + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(xfrm_register_type); + +void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + + if (unlikely(afinfo == NULL)) + return; + +#define X(afi, T, name) do { \ + WARN_ON((afi)->type_ ## name != (T)); \ + (afi)->type_ ## name = NULL; \ + } while (0) + + switch (type->proto) { + case IPPROTO_COMP: + X(afinfo, type, comp); + break; + case IPPROTO_AH: + X(afinfo, type, ah); + break; + case IPPROTO_ESP: + X(afinfo, type, esp); + break; + case IPPROTO_IPIP: + X(afinfo, type, ipip); + break; + case IPPROTO_DSTOPTS: + X(afinfo, type, dstopts); + break; + case IPPROTO_ROUTING: + X(afinfo, type, routing); + break; + case IPPROTO_IPV6: + X(afinfo, type, ipip6); + break; + default: + WARN_ON(1); + break; + } +#undef X + rcu_read_unlock(); +} +EXPORT_SYMBOL(xfrm_unregister_type); + +static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family) +{ + const struct xfrm_type *type = NULL; + struct xfrm_state_afinfo *afinfo; + int modload_attempted = 0; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + + switch (proto) { + case IPPROTO_COMP: + type = afinfo->type_comp; + break; + case IPPROTO_AH: + type = afinfo->type_ah; + break; + case IPPROTO_ESP: + type = afinfo->type_esp; + break; + case IPPROTO_IPIP: + type = afinfo->type_ipip; + break; + case IPPROTO_DSTOPTS: + type = afinfo->type_dstopts; + break; + case IPPROTO_ROUTING: + type = afinfo->type_routing; + break; + case IPPROTO_IPV6: + type = afinfo->type_ipip6; + break; + default: + break; + } + + if (unlikely(type && !try_module_get(type->owner))) + type = NULL; + + rcu_read_unlock(); + + if (!type && !modload_attempted) { + request_module("xfrm-type-%d-%d", family, proto); + modload_attempted = 1; + goto retry; + } + + return type; +} + +static void xfrm_put_type(const struct xfrm_type *type) +{ + module_put(type->owner); +} + +int xfrm_register_type_offload(const struct xfrm_type_offload *type, + unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + int err = 0; + + if (unlikely(afinfo == NULL)) + return -EAFNOSUPPORT; + + switch (type->proto) { + case IPPROTO_ESP: + WARN_ON(afinfo->type_offload_esp); + afinfo->type_offload_esp = type; + break; + default: + WARN_ON(1); + err = -EPROTONOSUPPORT; + break; + } + + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(xfrm_register_type_offload); + +void xfrm_unregister_type_offload(const struct xfrm_type_offload *type, + unsigned short family) +{ + struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); + + if (unlikely(afinfo == NULL)) + return; + + switch (type->proto) { + case IPPROTO_ESP: + WARN_ON(afinfo->type_offload_esp != type); + afinfo->type_offload_esp = NULL; + break; + default: + WARN_ON(1); + break; + } + rcu_read_unlock(); +} +EXPORT_SYMBOL(xfrm_unregister_type_offload); + +static const struct xfrm_type_offload * +xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load) +{ + const struct xfrm_type_offload *type = NULL; + struct xfrm_state_afinfo *afinfo; + +retry: + afinfo = xfrm_state_get_afinfo(family); + if (unlikely(afinfo == NULL)) + return NULL; + + switch (proto) { + case IPPROTO_ESP: + type = afinfo->type_offload_esp; + break; + default: + break; + } + + if ((type && !try_module_get(type->owner))) + type = NULL; + + rcu_read_unlock(); + + if (!type && try_load) { + request_module("xfrm-offload-%d-%d", family, proto); + try_load = false; + goto retry; + } + + return type; +} + +static void xfrm_put_type_offload(const struct xfrm_type_offload *type) +{ + module_put(type->owner); +} + +static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = { + [XFRM_MODE_BEET] = { + .encap = XFRM_MODE_BEET, + .flags = XFRM_MODE_FLAG_TUNNEL, + .family = AF_INET, + }, + [XFRM_MODE_TRANSPORT] = { + .encap = XFRM_MODE_TRANSPORT, + .family = AF_INET, + }, + [XFRM_MODE_TUNNEL] = { + .encap = XFRM_MODE_TUNNEL, + .flags = XFRM_MODE_FLAG_TUNNEL, + .family = AF_INET, + }, +}; + +static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = { + [XFRM_MODE_BEET] = { + .encap = XFRM_MODE_BEET, + .flags = XFRM_MODE_FLAG_TUNNEL, + .family = AF_INET6, + }, + [XFRM_MODE_ROUTEOPTIMIZATION] = { + .encap = XFRM_MODE_ROUTEOPTIMIZATION, + .family = AF_INET6, + }, + [XFRM_MODE_TRANSPORT] = { + .encap = XFRM_MODE_TRANSPORT, + .family = AF_INET6, + }, + [XFRM_MODE_TUNNEL] = { + .encap = XFRM_MODE_TUNNEL, + .flags = XFRM_MODE_FLAG_TUNNEL, + .family = AF_INET6, + }, +}; + +static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family) +{ + const struct xfrm_mode *mode; + + if (unlikely(encap >= XFRM_MODE_MAX)) + return NULL; + + switch (family) { + case AF_INET: + mode = &xfrm4_mode_map[encap]; + if (mode->family == family) + return mode; + break; + case AF_INET6: + mode = &xfrm6_mode_map[encap]; + if (mode->family == family) + return mode; + break; + default: + break; + } + + return NULL; +} + +void xfrm_state_free(struct xfrm_state *x) +{ + kmem_cache_free(xfrm_state_cache, x); +} +EXPORT_SYMBOL(xfrm_state_free); + +static void ___xfrm_state_destroy(struct xfrm_state *x) +{ + hrtimer_cancel(&x->mtimer); + del_timer_sync(&x->rtimer); + kfree(x->aead); + kfree(x->aalg); + kfree(x->ealg); + kfree(x->calg); + kfree(x->encap); + kfree(x->coaddr); + kfree(x->replay_esn); + kfree(x->preplay_esn); + if (x->type_offload) + xfrm_put_type_offload(x->type_offload); + if (x->type) { + x->type->destructor(x); + xfrm_put_type(x->type); + } + if (x->xfrag.page) + put_page(x->xfrag.page); + xfrm_dev_state_free(x); + security_xfrm_state_free(x); + xfrm_state_free(x); +} + +static void xfrm_state_gc_task(struct work_struct *work) +{ + struct xfrm_state *x; + struct hlist_node *tmp; + struct hlist_head gc_list; + + spin_lock_bh(&xfrm_state_gc_lock); + hlist_move_list(&xfrm_state_gc_list, &gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + + synchronize_rcu(); + + hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) + ___xfrm_state_destroy(x); +} + +static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) +{ + struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer); + enum hrtimer_restart ret = HRTIMER_NORESTART; + time64_t now = ktime_get_real_seconds(); + time64_t next = TIME64_MAX; + int warn = 0; + int err = 0; + + spin_lock(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto out; + if (x->km.state == XFRM_STATE_EXPIRED) + goto expired; + if (x->lft.hard_add_expires_seconds) { + long tmo = x->lft.hard_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + if (x->xflags & XFRM_SOFT_EXPIRE) { + /* enter hard expire without soft expire first?! + * setting a new date could trigger this. + * workaround: fix x->curflt.add_time by below: + */ + x->curlft.add_time = now - x->saved_tmo - 1; + tmo = x->lft.hard_add_expires_seconds - x->saved_tmo; + } else + goto expired; + } + if (tmo < next) + next = tmo; + } + if (x->lft.hard_use_expires_seconds) { + long tmo = x->lft.hard_use_expires_seconds + + (READ_ONCE(x->curlft.use_time) ? : now) - now; + if (tmo <= 0) + goto expired; + if (tmo < next) + next = tmo; + } + if (x->km.dying) + goto resched; + if (x->lft.soft_add_expires_seconds) { + long tmo = x->lft.soft_add_expires_seconds + + x->curlft.add_time - now; + if (tmo <= 0) { + warn = 1; + x->xflags &= ~XFRM_SOFT_EXPIRE; + } else if (tmo < next) { + next = tmo; + x->xflags |= XFRM_SOFT_EXPIRE; + x->saved_tmo = tmo; + } + } + if (x->lft.soft_use_expires_seconds) { + long tmo = x->lft.soft_use_expires_seconds + + (READ_ONCE(x->curlft.use_time) ? : now) - now; + if (tmo <= 0) + warn = 1; + else if (tmo < next) + next = tmo; + } + + x->km.dying = warn; + if (warn) + km_state_expired(x, 0, 0); +resched: + if (next != TIME64_MAX) { + hrtimer_forward_now(&x->mtimer, ktime_set(next, 0)); + ret = HRTIMER_RESTART; + } + + goto out; + +expired: + if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) + x->km.state = XFRM_STATE_EXPIRED; + + err = __xfrm_state_delete(x); + if (!err) + km_state_expired(x, 1, 0); + + xfrm_audit_state_delete(x, err ? 0 : 1, true); + +out: + spin_unlock(&x->lock); + return ret; +} + +static void xfrm_replay_timer_handler(struct timer_list *t); + +struct xfrm_state *xfrm_state_alloc(struct net *net) +{ + struct xfrm_state *x; + + x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC); + + if (x) { + write_pnet(&x->xs_net, net); + refcount_set(&x->refcnt, 1); + atomic_set(&x->tunnel_users, 0); + INIT_LIST_HEAD(&x->km.all); + INIT_HLIST_NODE(&x->bydst); + INIT_HLIST_NODE(&x->bysrc); + INIT_HLIST_NODE(&x->byspi); + INIT_HLIST_NODE(&x->byseq); + hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT); + x->mtimer.function = xfrm_timer_handler; + timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0); + x->curlft.add_time = ktime_get_real_seconds(); + x->lft.soft_byte_limit = XFRM_INF; + x->lft.soft_packet_limit = XFRM_INF; + x->lft.hard_byte_limit = XFRM_INF; + x->lft.hard_packet_limit = XFRM_INF; + x->replay_maxage = 0; + x->replay_maxdiff = 0; + spin_lock_init(&x->lock); + } + return x; +} +EXPORT_SYMBOL(xfrm_state_alloc); + +void __xfrm_state_destroy(struct xfrm_state *x, bool sync) +{ + WARN_ON(x->km.state != XFRM_STATE_DEAD); + + if (sync) { + synchronize_rcu(); + ___xfrm_state_destroy(x); + } else { + spin_lock_bh(&xfrm_state_gc_lock); + hlist_add_head(&x->gclist, &xfrm_state_gc_list); + spin_unlock_bh(&xfrm_state_gc_lock); + schedule_work(&xfrm_state_gc_work); + } +} +EXPORT_SYMBOL(__xfrm_state_destroy); + +int __xfrm_state_delete(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + int err = -ESRCH; + + if (x->km.state != XFRM_STATE_DEAD) { + x->km.state = XFRM_STATE_DEAD; + spin_lock(&net->xfrm.xfrm_state_lock); + list_del(&x->km.all); + hlist_del_rcu(&x->bydst); + hlist_del_rcu(&x->bysrc); + if (x->km.seq) + hlist_del_rcu(&x->byseq); + if (x->id.spi) + hlist_del_rcu(&x->byspi); + net->xfrm.state_num--; + spin_unlock(&net->xfrm.xfrm_state_lock); + + if (x->encap_sk) + sock_put(rcu_dereference_raw(x->encap_sk)); + + xfrm_dev_state_delete(x); + + /* All xfrm_state objects are created by xfrm_state_alloc. + * The xfrm_state_alloc call gives a reference, and that + * is what we are dropping here. + */ + xfrm_state_put(x); + err = 0; + } + + return err; +} +EXPORT_SYMBOL(__xfrm_state_delete); + +int xfrm_state_delete(struct xfrm_state *x) +{ + int err; + + spin_lock_bh(&x->lock); + err = __xfrm_state_delete(x); + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_state_delete); + +#ifdef CONFIG_SECURITY_NETWORK_XFRM +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + int i, err = 0; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (xfrm_id_proto_match(x->id.proto, proto) && + (err = security_xfrm_state_delete(x)) != 0) { + xfrm_audit_state_delete(x, 0, task_valid); + return err; + } + } + } + + return err; +} + +static inline int +xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) +{ + int i, err = 0; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + struct xfrm_dev_offload *xso; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + xso = &x->xso; + + if (xso->dev == dev && + (err = security_xfrm_state_delete(x)) != 0) { + xfrm_audit_state_delete(x, 0, task_valid); + return err; + } + } + } + + return err; +} +#else +static inline int +xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) +{ + return 0; +} + +static inline int +xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) +{ + return 0; +} +#endif + +int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync) +{ + int i, err = 0, cnt = 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + err = xfrm_state_flush_secctx_check(net, proto, task_valid); + if (err) + goto out; + + err = -ESRCH; + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; +restart: + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + if (!xfrm_state_kern(x) && + xfrm_id_proto_match(x->id.proto, proto)) { + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + task_valid); + if (sync) + xfrm_state_put_sync(x); + else + xfrm_state_put(x); + if (!err) + cnt++; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + goto restart; + } + } + } +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + if (cnt) + err = 0; + + return err; +} +EXPORT_SYMBOL(xfrm_state_flush); + +int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) +{ + int i, err = 0, cnt = 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); + if (err) + goto out; + + err = -ESRCH; + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + struct xfrm_dev_offload *xso; +restart: + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + xso = &x->xso; + + if (!xfrm_state_kern(x) && xso->dev == dev) { + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + task_valid); + xfrm_state_put(x); + if (!err) + cnt++; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + goto restart; + } + } + } + if (cnt) + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_dev_state_flush); + +void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) +{ + spin_lock_bh(&net->xfrm.xfrm_state_lock); + si->sadcnt = net->xfrm.state_num; + si->sadhcnt = net->xfrm.state_hmask + 1; + si->sadhmcnt = xfrm_state_hashmax; + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_sad_getinfo); + +static void +__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi4 *fl4 = &fl->u.ip4; + + sel->daddr.a4 = fl4->daddr; + sel->saddr.a4 = fl4->saddr; + sel->dport = xfrm_flowi_dport(fl, &fl4->uli); + sel->dport_mask = htons(0xffff); + sel->sport = xfrm_flowi_sport(fl, &fl4->uli); + sel->sport_mask = htons(0xffff); + sel->family = AF_INET; + sel->prefixlen_d = 32; + sel->prefixlen_s = 32; + sel->proto = fl4->flowi4_proto; + sel->ifindex = fl4->flowi4_oif; +} + +static void +__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl) +{ + const struct flowi6 *fl6 = &fl->u.ip6; + + /* Initialize temporary selector matching only to current session. */ + *(struct in6_addr *)&sel->daddr = fl6->daddr; + *(struct in6_addr *)&sel->saddr = fl6->saddr; + sel->dport = xfrm_flowi_dport(fl, &fl6->uli); + sel->dport_mask = htons(0xffff); + sel->sport = xfrm_flowi_sport(fl, &fl6->uli); + sel->sport_mask = htons(0xffff); + sel->family = AF_INET6; + sel->prefixlen_d = 128; + sel->prefixlen_s = 128; + sel->proto = fl6->flowi6_proto; + sel->ifindex = fl6->flowi6_oif; +} + +static void +xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, + const struct xfrm_tmpl *tmpl, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + unsigned short family) +{ + switch (family) { + case AF_INET: + __xfrm4_init_tempsel(&x->sel, fl); + break; + case AF_INET6: + __xfrm6_init_tempsel(&x->sel, fl); + break; + } + + x->id = tmpl->id; + + switch (tmpl->encap_family) { + case AF_INET: + if (x->id.daddr.a4 == 0) + x->id.daddr.a4 = daddr->a4; + x->props.saddr = tmpl->saddr; + if (x->props.saddr.a4 == 0) + x->props.saddr.a4 = saddr->a4; + break; + case AF_INET6: + if (ipv6_addr_any((struct in6_addr *)&x->id.daddr)) + memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr)); + memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr)); + if (ipv6_addr_any((struct in6_addr *)&x->props.saddr)) + memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr)); + break; + } + + x->props.mode = tmpl->mode; + x->props.reqid = tmpl->reqid; + x->props.family = tmpl->encap_family; +} + +static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, + const xfrm_address_t *daddr, + __be32 spi, u8 proto, + unsigned short family) +{ + unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family); + struct xfrm_state *x; + + hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) { + if (x->props.family != family || + x->id.spi != spi || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + if (!xfrm_state_hold_rcu(x)) + continue; + return x; + } + + return NULL; +} + +static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + unsigned int h = xfrm_src_hash(net, daddr, saddr, family); + struct xfrm_state *x; + + hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) { + if (x->props.family != family || + x->id.proto != proto || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + if ((mark & x->mark.m) != x->mark.v) + continue; + if (!xfrm_state_hold_rcu(x)) + continue; + return x; + } + + return NULL; +} + +static inline struct xfrm_state * +__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) +{ + struct net *net = xs_net(x); + u32 mark = x->mark.v & x->mark.m; + + if (use_spi) + return __xfrm_state_lookup(net, mark, &x->id.daddr, + x->id.spi, x->id.proto, family); + else + return __xfrm_state_lookup_byaddr(net, mark, + &x->id.daddr, + &x->props.saddr, + x->id.proto, family); +} + +static void xfrm_hash_grow_check(struct net *net, int have_hash_collision) +{ + if (have_hash_collision && + (net->xfrm.state_hmask + 1) < xfrm_state_hashmax && + net->xfrm.state_num > net->xfrm.state_hmask) + schedule_work(&net->xfrm.state_hash_work); +} + +static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x, + const struct flowi *fl, unsigned short family, + struct xfrm_state **best, int *acq_in_progress, + int *error) +{ + /* Resolution logic: + * 1. There is a valid state with matching selector. Done. + * 2. Valid state with inappropriate selector. Skip. + * + * Entering area of "sysdeps". + * + * 3. If state is not valid, selector is temporary, it selects + * only session which triggered previous resolution. Key + * manager will do something to install a state with proper + * selector. + */ + if (x->km.state == XFRM_STATE_VALID) { + if ((x->sel.family && + (x->sel.family != family || + !xfrm_selector_match(&x->sel, fl, family))) || + !security_xfrm_state_pol_flow_match(x, pol, + &fl->u.__fl_common)) + return; + + if (!*best || + (*best)->km.dying > x->km.dying || + ((*best)->km.dying == x->km.dying && + (*best)->curlft.add_time < x->curlft.add_time)) + *best = x; + } else if (x->km.state == XFRM_STATE_ACQ) { + *acq_in_progress = 1; + } else if (x->km.state == XFRM_STATE_ERROR || + x->km.state == XFRM_STATE_EXPIRED) { + if ((!x->sel.family || + (x->sel.family == family && + xfrm_selector_match(&x->sel, fl, family))) && + security_xfrm_state_pol_flow_match(x, pol, + &fl->u.__fl_common)) + *error = -ESRCH; + } +} + +struct xfrm_state * +xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, + const struct flowi *fl, struct xfrm_tmpl *tmpl, + struct xfrm_policy *pol, int *err, + unsigned short family, u32 if_id) +{ + static xfrm_address_t saddr_wildcard = { }; + struct net *net = xp_net(pol); + unsigned int h, h_wildcard; + struct xfrm_state *x, *x0, *to_put; + int acquire_in_progress = 0; + int error = 0; + struct xfrm_state *best = NULL; + u32 mark = pol->mark.v & pol->mark.m; + unsigned short encap_family = tmpl->encap_family; + unsigned int sequence; + struct km_event c; + + to_put = NULL; + + sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation); + + rcu_read_lock(); + h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); + hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + x->if_id == if_id && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, family, + &best, &acquire_in_progress, &error); + } + if (best || acquire_in_progress) + goto found; + + h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family); + hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) { + if (x->props.family == encap_family && + x->props.reqid == tmpl->reqid && + (mark & x->mark.m) == x->mark.v && + x->if_id == if_id && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_addr_equal(&x->id.daddr, daddr, encap_family) && + tmpl->mode == x->props.mode && + tmpl->id.proto == x->id.proto && + (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) + xfrm_state_look_at(pol, x, fl, family, + &best, &acquire_in_progress, &error); + } + +found: + x = best; + if (!x && !error && !acquire_in_progress) { + if (tmpl->id.spi && + (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi, + tmpl->id.proto, encap_family)) != NULL) { + to_put = x0; + error = -EEXIST; + goto out; + } + + c.net = net; + /* If the KMs have no listeners (yet...), avoid allocating an SA + * for each and every packet - garbage collection might not + * handle the flood. + */ + if (!km_is_alive(&c)) { + error = -ESRCH; + goto out; + } + + x = xfrm_state_alloc(net); + if (x == NULL) { + error = -ENOMEM; + goto out; + } + /* Initialize temporary state matching only + * to current session. */ + xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family); + memcpy(&x->mark, &pol->mark, sizeof(x->mark)); + x->if_id = if_id; + + error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid); + if (error) { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + goto out; + } + + if (km_query(x, tmpl, pol) == 0) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x->km.state = XFRM_STATE_ACQ; + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); + h = xfrm_src_hash(net, daddr, saddr, encap_family); + hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family); + hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); + } + if (x->km.seq) { + h = xfrm_seq_hash(net, x->km.seq); + hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h); + } + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + hrtimer_start(&x->mtimer, + ktime_set(net->xfrm.sysctl_acq_expires, 0), + HRTIMER_MODE_REL_SOFT); + net->xfrm.state_num++; + xfrm_hash_grow_check(net, x->bydst.next != NULL); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + } else { + x->km.state = XFRM_STATE_DEAD; + to_put = x; + x = NULL; + error = -ESRCH; + } + } +out: + if (x) { + if (!xfrm_state_hold_rcu(x)) { + *err = -EAGAIN; + x = NULL; + } + } else { + *err = acquire_in_progress ? -EAGAIN : error; + } + rcu_read_unlock(); + if (to_put) + xfrm_state_put(to_put); + + if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) { + *err = -EAGAIN; + if (x) { + xfrm_state_put(x); + x = NULL; + } + } + + return x; +} + +struct xfrm_state * +xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id, + xfrm_address_t *daddr, xfrm_address_t *saddr, + unsigned short family, u8 mode, u8 proto, u32 reqid) +{ + unsigned int h; + struct xfrm_state *rx = NULL, *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + (mark & x->mark.m) == x->mark.v && + x->if_id == if_id && + !(x->props.flags & XFRM_STATE_WILDRECV) && + xfrm_state_addr_check(x, daddr, saddr, family) && + mode == x->props.mode && + proto == x->id.proto && + x->km.state == XFRM_STATE_VALID) { + rx = x; + break; + } + } + + if (rx) + xfrm_state_hold(rx); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + + return rx; +} +EXPORT_SYMBOL(xfrm_stateonly_find); + +struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi, + unsigned short family) +{ + struct xfrm_state *x; + struct xfrm_state_walk *w; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_for_each_entry(w, &net->xfrm.state_all, all) { + x = container_of(w, struct xfrm_state, km); + if (x->props.family != family || + x->id.spi != spi) + continue; + + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; + } + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_lookup_byspi); + +static void __xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + unsigned int h; + + list_add(&x->km.all, &net->xfrm.state_all); + + h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr, + x->props.reqid, x->props.family); + hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); + + h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family); + hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); + + if (x->id.spi) { + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, + x->props.family); + + hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); + } + + if (x->km.seq) { + h = xfrm_seq_hash(net, x->km.seq); + + hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h); + } + + hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT); + if (x->replay_maxage) + mod_timer(&x->rtimer, jiffies + x->replay_maxage); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); +} + +/* net->xfrm.xfrm_state_lock is held */ +static void __xfrm_state_bump_genids(struct xfrm_state *xnew) +{ + struct net *net = xs_net(xnew); + unsigned short family = xnew->props.family; + u32 reqid = xnew->props.reqid; + struct xfrm_state *x; + unsigned int h; + u32 mark = xnew->mark.v & xnew->mark.m; + u32 if_id = xnew->if_id; + + h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.family == family && + x->props.reqid == reqid && + x->if_id == if_id && + (mark & x->mark.m) == x->mark.v && + xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) && + xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family)) + x->genid++; + } +} + +void xfrm_state_insert(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_insert); + +/* net->xfrm.xfrm_state_lock is held */ +static struct xfrm_state *__find_acq_core(struct net *net, + const struct xfrm_mark *m, + unsigned short family, u8 mode, + u32 reqid, u32 if_id, u8 proto, + const xfrm_address_t *daddr, + const xfrm_address_t *saddr, + int create) +{ + unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family); + struct xfrm_state *x; + u32 mark = m->v & m->m; + + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.reqid != reqid || + x->props.mode != mode || + x->props.family != family || + x->km.state != XFRM_STATE_ACQ || + x->id.spi != 0 || + x->id.proto != proto || + (mark & x->mark.m) != x->mark.v || + !xfrm_addr_equal(&x->id.daddr, daddr, family) || + !xfrm_addr_equal(&x->props.saddr, saddr, family)) + continue; + + xfrm_state_hold(x); + return x; + } + + if (!create) + return NULL; + + x = xfrm_state_alloc(net); + if (likely(x)) { + switch (family) { + case AF_INET: + x->sel.daddr.a4 = daddr->a4; + x->sel.saddr.a4 = saddr->a4; + x->sel.prefixlen_d = 32; + x->sel.prefixlen_s = 32; + x->props.saddr.a4 = saddr->a4; + x->id.daddr.a4 = daddr->a4; + break; + + case AF_INET6: + x->sel.daddr.in6 = daddr->in6; + x->sel.saddr.in6 = saddr->in6; + x->sel.prefixlen_d = 128; + x->sel.prefixlen_s = 128; + x->props.saddr.in6 = saddr->in6; + x->id.daddr.in6 = daddr->in6; + break; + } + + x->km.state = XFRM_STATE_ACQ; + x->id.proto = proto; + x->props.family = family; + x->props.mode = mode; + x->props.reqid = reqid; + x->if_id = if_id; + x->mark.v = m->v; + x->mark.m = m->m; + x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires; + xfrm_state_hold(x); + hrtimer_start(&x->mtimer, + ktime_set(net->xfrm.sysctl_acq_expires, 0), + HRTIMER_MODE_REL_SOFT); + list_add(&x->km.all, &net->xfrm.state_all); + hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h); + h = xfrm_src_hash(net, daddr, saddr, family); + hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h); + + net->xfrm.state_num++; + + xfrm_hash_grow_check(net, x->bydst.next != NULL); + } + + return x; +} + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); + +int xfrm_state_add(struct xfrm_state *x) +{ + struct net *net = xs_net(x); + struct xfrm_state *x1, *to_put; + int family; + int err; + u32 mark = x->mark.v & x->mark.m; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + + family = x->props.family; + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + x1 = __xfrm_state_locate(x, use_spi, family); + if (x1) { + to_put = x1; + x1 = NULL; + err = -EEXIST; + goto out; + } + + if (use_spi && x->km.seq) { + x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq); + if (x1 && ((x1->id.proto != x->id.proto) || + !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) { + to_put = x1; + x1 = NULL; + } + } + + if (use_spi && !x1) + x1 = __find_acq_core(net, &x->mark, family, x->props.mode, + x->props.reqid, x->if_id, x->id.proto, + &x->id.daddr, &x->props.saddr, 0); + + __xfrm_state_bump_genids(x); + __xfrm_state_insert(x); + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (x1) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + } + + if (to_put) + xfrm_state_put(to_put); + + return err; +} +EXPORT_SYMBOL(xfrm_state_add); + +#ifdef CONFIG_XFRM_MIGRATE +static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security) +{ + struct xfrm_user_sec_ctx *uctx; + int size = sizeof(*uctx) + security->ctx_len; + int err; + + uctx = kmalloc(size, GFP_KERNEL); + if (!uctx) + return -ENOMEM; + + uctx->exttype = XFRMA_SEC_CTX; + uctx->len = size; + uctx->ctx_doi = security->ctx_doi; + uctx->ctx_alg = security->ctx_alg; + uctx->ctx_len = security->ctx_len; + memcpy(uctx + 1, security->ctx_str, security->ctx_len); + err = security_xfrm_state_alloc(x, uctx); + kfree(uctx); + if (err) + return err; + + return 0; +} + +static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, + struct xfrm_encap_tmpl *encap) +{ + struct net *net = xs_net(orig); + struct xfrm_state *x = xfrm_state_alloc(net); + if (!x) + goto out; + + memcpy(&x->id, &orig->id, sizeof(x->id)); + memcpy(&x->sel, &orig->sel, sizeof(x->sel)); + memcpy(&x->lft, &orig->lft, sizeof(x->lft)); + x->props.mode = orig->props.mode; + x->props.replay_window = orig->props.replay_window; + x->props.reqid = orig->props.reqid; + x->props.family = orig->props.family; + x->props.saddr = orig->props.saddr; + + if (orig->aalg) { + x->aalg = xfrm_algo_auth_clone(orig->aalg); + if (!x->aalg) + goto error; + } + x->props.aalgo = orig->props.aalgo; + + if (orig->aead) { + x->aead = xfrm_algo_aead_clone(orig->aead); + x->geniv = orig->geniv; + if (!x->aead) + goto error; + } + if (orig->ealg) { + x->ealg = xfrm_algo_clone(orig->ealg); + if (!x->ealg) + goto error; + } + x->props.ealgo = orig->props.ealgo; + + if (orig->calg) { + x->calg = xfrm_algo_clone(orig->calg); + if (!x->calg) + goto error; + } + x->props.calgo = orig->props.calgo; + + if (encap || orig->encap) { + if (encap) + x->encap = kmemdup(encap, sizeof(*x->encap), + GFP_KERNEL); + else + x->encap = kmemdup(orig->encap, sizeof(*x->encap), + GFP_KERNEL); + + if (!x->encap) + goto error; + } + + if (orig->security) + if (clone_security(x, orig->security)) + goto error; + + if (orig->coaddr) { + x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr), + GFP_KERNEL); + if (!x->coaddr) + goto error; + } + + if (orig->replay_esn) { + if (xfrm_replay_clone(x, orig)) + goto error; + } + + memcpy(&x->mark, &orig->mark, sizeof(x->mark)); + memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark)); + + x->props.flags = orig->props.flags; + x->props.extra_flags = orig->props.extra_flags; + + x->if_id = orig->if_id; + x->tfcpad = orig->tfcpad; + x->replay_maxdiff = orig->replay_maxdiff; + x->replay_maxage = orig->replay_maxage; + memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft)); + x->km.state = orig->km.state; + x->km.seq = orig->km.seq; + x->replay = orig->replay; + x->preplay = orig->preplay; + x->mapping_maxage = orig->mapping_maxage; + x->lastused = orig->lastused; + x->new_mapping = 0; + x->new_mapping_sport = 0; + + return x; + + error: + xfrm_state_put(x); +out: + return NULL; +} + +struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net, + u32 if_id) +{ + unsigned int h; + struct xfrm_state *x = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + if (m->reqid) { + h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr, + m->reqid, m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (m->reqid && x->props.reqid != m->reqid) + continue; + if (if_id != 0 && x->if_id != if_id) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } else { + h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr, + m->old_family); + hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) { + if (x->props.mode != m->mode || + x->id.proto != m->proto) + continue; + if (if_id != 0 && x->if_id != if_id) + continue; + if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr, + m->old_family) || + !xfrm_addr_equal(&x->props.saddr, &m->old_saddr, + m->old_family)) + continue; + xfrm_state_hold(x); + break; + } + } + + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_migrate_state_find); + +struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, + struct xfrm_migrate *m, + struct xfrm_encap_tmpl *encap) +{ + struct xfrm_state *xc; + + xc = xfrm_state_clone(x, encap); + if (!xc) + return NULL; + + xc->props.family = m->new_family; + + if (xfrm_init_state(xc) < 0) + goto error; + + memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); + memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr)); + + /* add state */ + if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) { + /* a care is needed when the destination address of the + state is to be updated as it is a part of triplet */ + xfrm_state_insert(xc); + } else { + if (xfrm_state_add(xc) < 0) + goto error; + } + + return xc; +error: + xfrm_state_put(xc); + return NULL; +} +EXPORT_SYMBOL(xfrm_state_migrate); +#endif + +int xfrm_state_update(struct xfrm_state *x) +{ + struct xfrm_state *x1, *to_put; + int err; + int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); + struct net *net = xs_net(x); + + to_put = NULL; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x1 = __xfrm_state_locate(x, use_spi, x->props.family); + + err = -ESRCH; + if (!x1) + goto out; + + if (xfrm_state_kern(x1)) { + to_put = x1; + err = -EEXIST; + goto out; + } + + if (x1->km.state == XFRM_STATE_ACQ) { + __xfrm_state_insert(x); + x = NULL; + } + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + if (to_put) + xfrm_state_put(to_put); + + if (err) + return err; + + if (!x) { + xfrm_state_delete(x1); + xfrm_state_put(x1); + return 0; + } + + err = -EINVAL; + spin_lock_bh(&x1->lock); + if (likely(x1->km.state == XFRM_STATE_VALID)) { + if (x->encap && x1->encap && + x->encap->encap_type == x1->encap->encap_type) + memcpy(x1->encap, x->encap, sizeof(*x1->encap)); + else if (x->encap || x1->encap) + goto fail; + + if (x->coaddr && x1->coaddr) { + memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); + } + if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) + memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); + memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); + x1->km.dying = 0; + + hrtimer_start(&x1->mtimer, ktime_set(1, 0), + HRTIMER_MODE_REL_SOFT); + if (READ_ONCE(x1->curlft.use_time)) + xfrm_state_check_expire(x1); + + if (x->props.smark.m || x->props.smark.v || x->if_id) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + + if (x->props.smark.m || x->props.smark.v) + x1->props.smark = x->props.smark; + + if (x->if_id) + x1->if_id = x->if_id; + + __xfrm_state_bump_genids(x1); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + } + + err = 0; + x->km.state = XFRM_STATE_DEAD; + __xfrm_state_put(x); + } + +fail: + spin_unlock_bh(&x1->lock); + + xfrm_state_put(x1); + + return err; +} +EXPORT_SYMBOL(xfrm_state_update); + +int xfrm_state_check_expire(struct xfrm_state *x) +{ + if (!READ_ONCE(x->curlft.use_time)) + WRITE_ONCE(x->curlft.use_time, ktime_get_real_seconds()); + + if (x->curlft.bytes >= x->lft.hard_byte_limit || + x->curlft.packets >= x->lft.hard_packet_limit) { + x->km.state = XFRM_STATE_EXPIRED; + hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT); + return -EINVAL; + } + + if (!x->km.dying && + (x->curlft.bytes >= x->lft.soft_byte_limit || + x->curlft.packets >= x->lft.soft_packet_limit)) { + x->km.dying = 1; + km_state_expired(x, 0, 0); + } + return 0; +} +EXPORT_SYMBOL(xfrm_state_check_expire); + +struct xfrm_state * +xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + rcu_read_lock(); + x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family); + rcu_read_unlock(); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup); + +struct xfrm_state * +xfrm_state_lookup_byaddr(struct net *net, u32 mark, + const xfrm_address_t *daddr, const xfrm_address_t *saddr, + u8 proto, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_state_lookup_byaddr); + +struct xfrm_state * +xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid, + u32 if_id, u8 proto, const xfrm_address_t *daddr, + const xfrm_address_t *saddr, int create, unsigned short family) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + return x; +} +EXPORT_SYMBOL(xfrm_find_acq); + +#ifdef CONFIG_XFRM_SUB_POLICY +#if IS_ENABLED(CONFIG_IPV6) +/* distribution counting sort function for xfrm_state and xfrm_tmpl */ +static void +__xfrm6_sort(void **dst, void **src, int n, + int (*cmp)(const void *p), int maxclass) +{ + int count[XFRM_MAX_DEPTH] = { }; + int class[XFRM_MAX_DEPTH]; + int i; + + for (i = 0; i < n; i++) { + int c = cmp(src[i]); + + class[i] = c; + count[c]++; + } + + for (i = 2; i < maxclass; i++) + count[i] += count[i - 1]; + + for (i = 0; i < n; i++) { + dst[count[class[i] - 1]++] = src[i]; + src[i] = NULL; + } +} + +/* Rule for xfrm_state: + * + * rule 1: select IPsec transport except AH + * rule 2: select MIPv6 RO or inbound trigger + * rule 3: select IPsec transport AH + * rule 4: select IPsec tunnel + * rule 5: others + */ +static int __xfrm6_state_sort_cmp(const void *p) +{ + const struct xfrm_state *v = p; + + switch (v->props.mode) { + case XFRM_MODE_TRANSPORT: + if (v->id.proto != IPPROTO_AH) + return 1; + else + return 3; +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case XFRM_MODE_ROUTEOPTIMIZATION: + case XFRM_MODE_IN_TRIGGER: + return 2; +#endif + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + return 4; + } + return 5; +} + +/* Rule for xfrm_tmpl: + * + * rule 1: select IPsec transport + * rule 2: select MIPv6 RO or inbound trigger + * rule 3: select IPsec tunnel + * rule 4: others + */ +static int __xfrm6_tmpl_sort_cmp(const void *p) +{ + const struct xfrm_tmpl *v = p; + + switch (v->mode) { + case XFRM_MODE_TRANSPORT: + return 1; +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case XFRM_MODE_ROUTEOPTIMIZATION: + case XFRM_MODE_IN_TRIGGER: + return 2; +#endif + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + return 3; + } + return 4; +} +#else +static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; } +static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; } + +static inline void +__xfrm6_sort(void **dst, void **src, int n, + int (*cmp)(const void *p), int maxclass) +{ + int i; + + for (i = 0; i < n; i++) + dst[i] = src[i]; +} +#endif /* CONFIG_IPV6 */ + +void +xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, + unsigned short family) +{ + int i; + + if (family == AF_INET6) + __xfrm6_sort((void **)dst, (void **)src, n, + __xfrm6_tmpl_sort_cmp, 5); + else + for (i = 0; i < n; i++) + dst[i] = src[i]; +} + +void +xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, + unsigned short family) +{ + int i; + + if (family == AF_INET6) + __xfrm6_sort((void **)dst, (void **)src, n, + __xfrm6_state_sort_cmp, 6); + else + for (i = 0; i < n; i++) + dst[i] = src[i]; +} +#endif + +/* Silly enough, but I'm lazy to build resolution list */ + +static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + unsigned int h = xfrm_seq_hash(net, seq); + struct xfrm_state *x; + + hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) { + if (x->km.seq == seq && + (mark & x->mark.m) == x->mark.v && + x->km.state == XFRM_STATE_ACQ) { + xfrm_state_hold(x); + return x; + } + } + + return NULL; +} + +struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq) +{ + struct xfrm_state *x; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x = __xfrm_find_acq_byseq(net, mark, seq); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return x; +} +EXPORT_SYMBOL(xfrm_find_acq_byseq); + +u32 xfrm_get_acqseq(void) +{ + u32 res; + static atomic_t acqseq; + + do { + res = atomic_inc_return(&acqseq); + } while (!res); + + return res; +} +EXPORT_SYMBOL(xfrm_get_acqseq); + +int verify_spi_info(u8 proto, u32 min, u32 max) +{ + switch (proto) { + case IPPROTO_AH: + case IPPROTO_ESP: + break; + + case IPPROTO_COMP: + /* IPCOMP spi is 16-bits. */ + if (max >= 0x10000) + return -EINVAL; + break; + + default: + return -EINVAL; + } + + if (min > max) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(verify_spi_info); + +int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high) +{ + struct net *net = xs_net(x); + unsigned int h; + struct xfrm_state *x0; + int err = -ENOENT; + __be32 minspi = htonl(low); + __be32 maxspi = htonl(high); + __be32 newspi = 0; + u32 mark = x->mark.v & x->mark.m; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_DEAD) + goto unlock; + + err = 0; + if (x->id.spi) + goto unlock; + + err = -ENOENT; + + if (minspi == maxspi) { + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family); + if (x0) { + xfrm_state_put(x0); + goto unlock; + } + newspi = minspi; + } else { + u32 spi = 0; + for (h = 0; h < high-low+1; h++) { + spi = low + prandom_u32_max(high - low + 1); + x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family); + if (x0 == NULL) { + newspi = htonl(spi); + break; + } + xfrm_state_put(x0); + } + } + if (newspi) { + spin_lock_bh(&net->xfrm.xfrm_state_lock); + x->id.spi = newspi; + h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family); + hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = 0; + } + +unlock: + spin_unlock_bh(&x->lock); + + return err; +} +EXPORT_SYMBOL(xfrm_alloc_spi); + +static bool __xfrm_state_filter_match(struct xfrm_state *x, + struct xfrm_address_filter *filter) +{ + if (filter) { + if ((filter->family == AF_INET || + filter->family == AF_INET6) && + x->props.family != filter->family) + return false; + + return addr_match(&x->props.saddr, &filter->saddr, + filter->splen) && + addr_match(&x->id.daddr, &filter->daddr, + filter->dplen); + } + return true; +} + +int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk, + int (*func)(struct xfrm_state *, int, void*), + void *data) +{ + struct xfrm_state *state; + struct xfrm_state_walk *x; + int err = 0; + + if (walk->seq != 0 && list_empty(&walk->all)) + return 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + if (list_empty(&walk->all)) + x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); + else + x = list_first_entry(&walk->all, struct xfrm_state_walk, all); + list_for_each_entry_from(x, &net->xfrm.state_all, all) { + if (x->state == XFRM_STATE_DEAD) + continue; + state = container_of(x, struct xfrm_state, km); + if (!xfrm_id_proto_match(state->id.proto, walk->proto)) + continue; + if (!__xfrm_state_filter_match(state, walk->filter)) + continue; + err = func(state, walk->seq, data); + if (err) { + list_move_tail(&walk->all, &x->all); + goto out; + } + walk->seq++; + } + if (walk->seq == 0) { + err = -ENOENT; + goto out; + } + list_del_init(&walk->all); +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_walk); + +void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto, + struct xfrm_address_filter *filter) +{ + INIT_LIST_HEAD(&walk->all); + walk->proto = proto; + walk->state = XFRM_STATE_DEAD; + walk->seq = 0; + walk->filter = filter; +} +EXPORT_SYMBOL(xfrm_state_walk_init); + +void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net) +{ + kfree(walk->filter); + + if (list_empty(&walk->all)) + return; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + list_del(&walk->all); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); +} +EXPORT_SYMBOL(xfrm_state_walk_done); + +static void xfrm_replay_timer_handler(struct timer_list *t) +{ + struct xfrm_state *x = from_timer(x, t, rtimer); + + spin_lock(&x->lock); + + if (x->km.state == XFRM_STATE_VALID) { + if (xfrm_aevent_is_on(xs_net(x))) + xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); + else + x->xflags |= XFRM_TIME_DEFER; + } + + spin_unlock(&x->lock); +} + +static LIST_HEAD(xfrm_km_list); + +void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify_policy) + km->notify_policy(xp, dir, c); + rcu_read_unlock(); +} + +void km_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_mgr *km; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) + if (km->notify) + km->notify(x, c); + rcu_read_unlock(); +} + +EXPORT_SYMBOL(km_policy_notify); +EXPORT_SYMBOL(km_state_notify); + +void km_state_expired(struct xfrm_state *x, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_EXPIRE; + km_state_notify(x, &c); +} + +EXPORT_SYMBOL(km_state_expired); +/* + * We send to all registered managers regardless of failure + * We are happy with one success +*/ +int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) +{ + int err = -EINVAL, acqret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + acqret = km->acquire(x, t, pol); + if (!acqret) + err = acqret; + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_query); + +static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) +{ + int err = -EINVAL; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->new_mapping) + err = km->new_mapping(x, ipaddr, sport); + if (!err) + break; + } + rcu_read_unlock(); + return err; +} + +int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) +{ + int ret = 0; + + if (x->mapping_maxage) { + if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage || + x->new_mapping_sport != sport) { + x->new_mapping_sport = sport; + x->new_mapping = jiffies / HZ; + ret = __km_new_mapping(x, ipaddr, sport); + } + } else { + ret = __km_new_mapping(x, ipaddr, sport); + } + + return ret; +} +EXPORT_SYMBOL(km_new_mapping); + +void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid) +{ + struct km_event c; + + c.data.hard = hard; + c.portid = portid; + c.event = XFRM_MSG_POLEXPIRE; + km_policy_notify(pol, dir, &c); +} +EXPORT_SYMBOL(km_policy_expired); + +#ifdef CONFIG_XFRM_MIGRATE +int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->migrate) { + ret = km->migrate(sel, dir, type, m, num_migrate, k, + encap); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_migrate); +#endif + +int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) +{ + int err = -EINVAL; + int ret; + struct xfrm_mgr *km; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->report) { + ret = km->report(net, proto, sel, addr); + if (!ret) + err = ret; + } + } + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(km_report); + +static bool km_is_alive(const struct km_event *c) +{ + struct xfrm_mgr *km; + bool is_alive = false; + + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + if (km->is_alive && km->is_alive(c)) { + is_alive = true; + break; + } + } + rcu_read_unlock(); + + return is_alive; +} + +#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT) +static DEFINE_SPINLOCK(xfrm_translator_lock); +static struct xfrm_translator __rcu *xfrm_translator; + +struct xfrm_translator *xfrm_get_translator(void) +{ + struct xfrm_translator *xtr; + + rcu_read_lock(); + xtr = rcu_dereference(xfrm_translator); + if (unlikely(!xtr)) + goto out; + if (!try_module_get(xtr->owner)) + xtr = NULL; +out: + rcu_read_unlock(); + return xtr; +} +EXPORT_SYMBOL_GPL(xfrm_get_translator); + +void xfrm_put_translator(struct xfrm_translator *xtr) +{ + module_put(xtr->owner); +} +EXPORT_SYMBOL_GPL(xfrm_put_translator); + +int xfrm_register_translator(struct xfrm_translator *xtr) +{ + int err = 0; + + spin_lock_bh(&xfrm_translator_lock); + if (unlikely(xfrm_translator != NULL)) + err = -EEXIST; + else + rcu_assign_pointer(xfrm_translator, xtr); + spin_unlock_bh(&xfrm_translator_lock); + + return err; +} +EXPORT_SYMBOL_GPL(xfrm_register_translator); + +int xfrm_unregister_translator(struct xfrm_translator *xtr) +{ + int err = 0; + + spin_lock_bh(&xfrm_translator_lock); + if (likely(xfrm_translator != NULL)) { + if (rcu_access_pointer(xfrm_translator) != xtr) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_translator, NULL); + } + spin_unlock_bh(&xfrm_translator_lock); + synchronize_rcu(); + + return err; +} +EXPORT_SYMBOL_GPL(xfrm_unregister_translator); +#endif + +int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen) +{ + int err; + u8 *data; + struct xfrm_mgr *km; + struct xfrm_policy *pol = NULL; + + if (sockptr_is_null(optval) && !optlen) { + xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); + xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); + __sk_dst_reset(sk); + return 0; + } + + if (optlen <= 0 || optlen > PAGE_SIZE) + return -EMSGSIZE; + + data = memdup_sockptr(optval, optlen); + if (IS_ERR(data)) + return PTR_ERR(data); + + if (in_compat_syscall()) { + struct xfrm_translator *xtr = xfrm_get_translator(); + + if (!xtr) { + kfree(data); + return -EOPNOTSUPP; + } + + err = xtr->xlate_user_policy_sockptr(&data, optlen); + xfrm_put_translator(xtr); + if (err) { + kfree(data); + return err; + } + } + + err = -EINVAL; + rcu_read_lock(); + list_for_each_entry_rcu(km, &xfrm_km_list, list) { + pol = km->compile_policy(sk, optname, data, + optlen, &err); + if (err >= 0) + break; + } + rcu_read_unlock(); + + if (err >= 0) { + xfrm_sk_policy_insert(sk, err, pol); + xfrm_pol_put(pol); + __sk_dst_reset(sk); + err = 0; + } + + kfree(data); + return err; +} +EXPORT_SYMBOL(xfrm_user_policy); + +static DEFINE_SPINLOCK(xfrm_km_lock); + +void xfrm_register_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_add_tail_rcu(&km->list, &xfrm_km_list); + spin_unlock_bh(&xfrm_km_lock); +} +EXPORT_SYMBOL(xfrm_register_km); + +void xfrm_unregister_km(struct xfrm_mgr *km) +{ + spin_lock_bh(&xfrm_km_lock); + list_del_rcu(&km->list); + spin_unlock_bh(&xfrm_km_lock); + synchronize_rcu(); +} +EXPORT_SYMBOL(xfrm_unregister_km); + +int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0; + + if (WARN_ON(afinfo->family >= NPROTO)) + return -EAFNOSUPPORT; + + spin_lock_bh(&xfrm_state_afinfo_lock); + if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) + err = -EEXIST; + else + rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo); + spin_unlock_bh(&xfrm_state_afinfo_lock); + return err; +} +EXPORT_SYMBOL(xfrm_state_register_afinfo); + +int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) +{ + int err = 0, family = afinfo->family; + + if (WARN_ON(family >= NPROTO)) + return -EAFNOSUPPORT; + + spin_lock_bh(&xfrm_state_afinfo_lock); + if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { + if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo) + err = -EINVAL; + else + RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL); + } + spin_unlock_bh(&xfrm_state_afinfo_lock); + synchronize_rcu(); + return err; +} +EXPORT_SYMBOL(xfrm_state_unregister_afinfo); + +struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family) +{ + if (unlikely(family >= NPROTO)) + return NULL; + + return rcu_dereference(xfrm_state_afinfo[family]); +} +EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu); + +struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) +{ + struct xfrm_state_afinfo *afinfo; + if (unlikely(family >= NPROTO)) + return NULL; + rcu_read_lock(); + afinfo = rcu_dereference(xfrm_state_afinfo[family]); + if (unlikely(!afinfo)) + rcu_read_unlock(); + return afinfo; +} + +void xfrm_flush_gc(void) +{ + flush_work(&xfrm_state_gc_work); +} +EXPORT_SYMBOL(xfrm_flush_gc); + +/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ +void xfrm_state_delete_tunnel(struct xfrm_state *x) +{ + if (x->tunnel) { + struct xfrm_state *t = x->tunnel; + + if (atomic_read(&t->tunnel_users) == 2) + xfrm_state_delete(t); + atomic_dec(&t->tunnel_users); + xfrm_state_put_sync(t); + x->tunnel = NULL; + } +} +EXPORT_SYMBOL(xfrm_state_delete_tunnel); + +u32 xfrm_state_mtu(struct xfrm_state *x, int mtu) +{ + const struct xfrm_type *type = READ_ONCE(x->type); + struct crypto_aead *aead; + u32 blksize, net_adj = 0; + + if (x->km.state != XFRM_STATE_VALID || + !type || type->proto != IPPROTO_ESP) + return mtu - x->props.header_len; + + aead = x->data; + blksize = ALIGN(crypto_aead_blocksize(aead), 4); + + switch (x->props.mode) { + case XFRM_MODE_TRANSPORT: + case XFRM_MODE_BEET: + if (x->props.family == AF_INET) + net_adj = sizeof(struct iphdr); + else if (x->props.family == AF_INET6) + net_adj = sizeof(struct ipv6hdr); + break; + case XFRM_MODE_TUNNEL: + break; + default: + WARN_ON_ONCE(1); + break; + } + + return ((mtu - x->props.header_len - crypto_aead_authsize(aead) - + net_adj) & ~(blksize - 1)) + net_adj - 2; +} +EXPORT_SYMBOL_GPL(xfrm_state_mtu); + +int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, + struct netlink_ext_ack *extack) +{ + const struct xfrm_mode *inner_mode; + const struct xfrm_mode *outer_mode; + int family = x->props.family; + int err; + + if (family == AF_INET && + READ_ONCE(xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)) + x->props.flags |= XFRM_STATE_NOPMTUDISC; + + err = -EPROTONOSUPPORT; + + if (x->sel.family != AF_UNSPEC) { + inner_mode = xfrm_get_mode(x->props.mode, x->sel.family); + if (inner_mode == NULL) { + NL_SET_ERR_MSG(extack, "Requested mode not found"); + goto error; + } + + if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) && + family != x->sel.family) { + NL_SET_ERR_MSG(extack, "Only tunnel modes can accommodate a change of family"); + goto error; + } + + x->inner_mode = *inner_mode; + } else { + const struct xfrm_mode *inner_mode_iaf; + int iafamily = AF_INET; + + inner_mode = xfrm_get_mode(x->props.mode, x->props.family); + if (inner_mode == NULL) { + NL_SET_ERR_MSG(extack, "Requested mode not found"); + goto error; + } + + x->inner_mode = *inner_mode; + + if (x->props.family == AF_INET) + iafamily = AF_INET6; + + inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily); + if (inner_mode_iaf) { + if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL) + x->inner_mode_iaf = *inner_mode_iaf; + } + } + + x->type = xfrm_get_type(x->id.proto, family); + if (x->type == NULL) { + NL_SET_ERR_MSG(extack, "Requested type not found"); + goto error; + } + + x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload); + + err = x->type->init_state(x, extack); + if (err) + goto error; + + outer_mode = xfrm_get_mode(x->props.mode, family); + if (!outer_mode) { + NL_SET_ERR_MSG(extack, "Requested mode not found"); + err = -EPROTONOSUPPORT; + goto error; + } + + x->outer_mode = *outer_mode; + if (init_replay) { + err = xfrm_init_replay(x, extack); + if (err) + goto error; + } + +error: + return err; +} + +EXPORT_SYMBOL(__xfrm_init_state); + +int xfrm_init_state(struct xfrm_state *x) +{ + int err; + + err = __xfrm_init_state(x, true, false, NULL); + if (!err) + x->km.state = XFRM_STATE_VALID; + + return err; +} + +EXPORT_SYMBOL(xfrm_init_state); + +int __net_init xfrm_state_init(struct net *net) +{ + unsigned int sz; + + if (net_eq(net, &init_net)) + xfrm_state_cache = KMEM_CACHE(xfrm_state, + SLAB_HWCACHE_ALIGN | SLAB_PANIC); + + INIT_LIST_HEAD(&net->xfrm.state_all); + + sz = sizeof(struct hlist_head) * 8; + + net->xfrm.state_bydst = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bydst) + goto out_bydst; + net->xfrm.state_bysrc = xfrm_hash_alloc(sz); + if (!net->xfrm.state_bysrc) + goto out_bysrc; + net->xfrm.state_byspi = xfrm_hash_alloc(sz); + if (!net->xfrm.state_byspi) + goto out_byspi; + net->xfrm.state_byseq = xfrm_hash_alloc(sz); + if (!net->xfrm.state_byseq) + goto out_byseq; + net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1); + + net->xfrm.state_num = 0; + INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize); + spin_lock_init(&net->xfrm.xfrm_state_lock); + seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation, + &net->xfrm.xfrm_state_lock); + return 0; + +out_byseq: + xfrm_hash_free(net->xfrm.state_byspi, sz); +out_byspi: + xfrm_hash_free(net->xfrm.state_bysrc, sz); +out_bysrc: + xfrm_hash_free(net->xfrm.state_bydst, sz); +out_bydst: + return -ENOMEM; +} + +void xfrm_state_fini(struct net *net) +{ + unsigned int sz; + + flush_work(&net->xfrm.state_hash_work); + flush_work(&xfrm_state_gc_work); + xfrm_state_flush(net, 0, false, true); + + WARN_ON(!list_empty(&net->xfrm.state_all)); + + sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head); + WARN_ON(!hlist_empty(net->xfrm.state_byseq)); + xfrm_hash_free(net->xfrm.state_byseq, sz); + WARN_ON(!hlist_empty(net->xfrm.state_byspi)); + xfrm_hash_free(net->xfrm.state_byspi, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bysrc)); + xfrm_hash_free(net->xfrm.state_bysrc, sz); + WARN_ON(!hlist_empty(net->xfrm.state_bydst)); + xfrm_hash_free(net->xfrm.state_bydst, sz); +} + +#ifdef CONFIG_AUDITSYSCALL +static void xfrm_audit_helper_sainfo(struct xfrm_state *x, + struct audit_buffer *audit_buf) +{ + struct xfrm_sec_ctx *ctx = x->security; + u32 spi = ntohl(x->id.spi); + + if (ctx) + audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s", + ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str); + + switch (x->props.family) { + case AF_INET: + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &x->props.saddr.a4, &x->id.daddr.a4); + break; + case AF_INET6: + audit_log_format(audit_buf, " src=%pI6 dst=%pI6", + x->props.saddr.a6, x->id.daddr.a6); + break; + } + + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); +} + +static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family, + struct audit_buffer *audit_buf) +{ + const struct iphdr *iph4; + const struct ipv6hdr *iph6; + + switch (family) { + case AF_INET: + iph4 = ip_hdr(skb); + audit_log_format(audit_buf, " src=%pI4 dst=%pI4", + &iph4->saddr, &iph4->daddr); + break; + case AF_INET6: + iph6 = ipv6_hdr(skb); + audit_log_format(audit_buf, + " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x", + &iph6->saddr, &iph6->daddr, + iph6->flow_lbl[0] & 0x0f, + iph6->flow_lbl[1], + iph6->flow_lbl[2]); + break; + } +} + +void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-add"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_add); + +void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SAD-delete"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_usrinfo(task_valid, audit_buf); + xfrm_audit_helper_sainfo(x, audit_buf); + audit_log_format(audit_buf, " res=%u", result); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_delete); + +void xfrm_audit_state_replay_overflow(struct xfrm_state *x, + struct sk_buff *skb) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replay-overflow"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + /* don't record the sequence number because it's inherent in this kind + * of audit message */ + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow); + +void xfrm_audit_state_replay(struct xfrm_state *x, + struct sk_buff *skb, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-replayed-pkt"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + spi = ntohl(x->id.spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_replay); + +void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family) +{ + struct audit_buffer *audit_buf; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple); + +void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, + __be32 net_spi, __be32 net_seq) +{ + struct audit_buffer *audit_buf; + u32 spi; + + audit_buf = xfrm_audit_start("SA-notfound"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, family, audit_buf); + spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound); + +void xfrm_audit_state_icvfail(struct xfrm_state *x, + struct sk_buff *skb, u8 proto) +{ + struct audit_buffer *audit_buf; + __be32 net_spi; + __be32 net_seq; + + audit_buf = xfrm_audit_start("SA-icv-failure"); + if (audit_buf == NULL) + return; + xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf); + if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) { + u32 spi = ntohl(net_spi); + audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u", + spi, spi, ntohl(net_seq)); + } + audit_log_end(audit_buf); +} +EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail); +#endif /* CONFIG_AUDITSYSCALL */ diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c new file mode 100644 index 000000000..0c6c5ef65 --- /dev/null +++ b/net/xfrm/xfrm_sysctl.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +static void __net_init __xfrm_sysctl_init(struct net *net) +{ + net->xfrm.sysctl_aevent_etime = XFRM_AE_ETIME; + net->xfrm.sysctl_aevent_rseqth = XFRM_AE_SEQT_SIZE; + net->xfrm.sysctl_larval_drop = 1; + net->xfrm.sysctl_acq_expires = 30; +} + +#ifdef CONFIG_SYSCTL +static struct ctl_table xfrm_table[] = { + { + .procname = "xfrm_aevent_etime", + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_douintvec + }, + { + .procname = "xfrm_aevent_rseqth", + .maxlen = sizeof(u32), + .mode = 0644, + .proc_handler = proc_douintvec + }, + { + .procname = "xfrm_larval_drop", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "xfrm_acq_expires", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + {} +}; + +int __net_init xfrm_sysctl_init(struct net *net) +{ + struct ctl_table *table; + + __xfrm_sysctl_init(net); + + table = kmemdup(xfrm_table, sizeof(xfrm_table), GFP_KERNEL); + if (!table) + goto out_kmemdup; + table[0].data = &net->xfrm.sysctl_aevent_etime; + table[1].data = &net->xfrm.sysctl_aevent_rseqth; + table[2].data = &net->xfrm.sysctl_larval_drop; + table[3].data = &net->xfrm.sysctl_acq_expires; + + /* Don't export sysctls to unprivileged users */ + if (net->user_ns != &init_user_ns) + table[0].procname = NULL; + + net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table); + if (!net->xfrm.sysctl_hdr) + goto out_register; + return 0; + +out_register: + kfree(table); +out_kmemdup: + return -ENOMEM; +} + +void __net_exit xfrm_sysctl_fini(struct net *net) +{ + struct ctl_table *table; + + table = net->xfrm.sysctl_hdr->ctl_table_arg; + unregister_net_sysctl_table(net->xfrm.sysctl_hdr); + kfree(table); +} +#else +int __net_init xfrm_sysctl_init(struct net *net) +{ + __xfrm_sysctl_init(net); + return 0; +} +#endif diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c new file mode 100644 index 000000000..d042ca012 --- /dev/null +++ b/net/xfrm/xfrm_user.c @@ -0,0 +1,3830 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* xfrm_user.c: User interface to configure xfrm engine. + * + * Copyright (C) 2002 David S. Miller (davem@redhat.com) + * + * Changes: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro + * IPv6 support + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#if IS_ENABLED(CONFIG_IPV6) +#include +#endif +#include + +static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type, + struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[type]; + struct xfrm_algo *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < (int)xfrm_alg_len(algp)) { + NL_SET_ERR_MSG(extack, "Invalid AUTH/CRYPT/COMP attribute length"); + return -EINVAL; + } + + switch (type) { + case XFRMA_ALG_AUTH: + case XFRMA_ALG_CRYPT: + case XFRMA_ALG_COMP: + break; + + default: + NL_SET_ERR_MSG(extack, "Invalid algorithm attribute type"); + return -EINVAL; + } + + algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; + return 0; +} + +static int verify_auth_trunc(struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC]; + struct xfrm_algo_auth *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < (int)xfrm_alg_auth_len(algp)) { + NL_SET_ERR_MSG(extack, "Invalid AUTH_TRUNC attribute length"); + return -EINVAL; + } + + algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; + return 0; +} + +static int verify_aead(struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_ALG_AEAD]; + struct xfrm_algo_aead *algp; + + if (!rt) + return 0; + + algp = nla_data(rt); + if (nla_len(rt) < (int)aead_len(algp)) { + NL_SET_ERR_MSG(extack, "Invalid AEAD attribute length"); + return -EINVAL; + } + + algp->alg_name[sizeof(algp->alg_name) - 1] = '\0'; + return 0; +} + +static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type, + xfrm_address_t **addrp) +{ + struct nlattr *rt = attrs[type]; + + if (rt && addrp) + *addrp = nla_data(rt); +} + +static inline int verify_sec_ctx_len(struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_user_sec_ctx *uctx; + + if (!rt) + return 0; + + uctx = nla_data(rt); + if (uctx->len > nla_len(rt) || + uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len)) { + NL_SET_ERR_MSG(extack, "Invalid security context length"); + return -EINVAL; + } + + return 0; +} + +static inline int verify_replay(struct xfrm_usersa_info *p, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL]; + struct xfrm_replay_state_esn *rs; + + if (!rt) { + if (p->flags & XFRM_STATE_ESN) { + NL_SET_ERR_MSG(extack, "Missing required attribute for ESN"); + return -EINVAL; + } + return 0; + } + + rs = nla_data(rt); + + if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8) { + NL_SET_ERR_MSG(extack, "ESN bitmap length must be <= 128"); + return -EINVAL; + } + + if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) && + nla_len(rt) != sizeof(*rs)) { + NL_SET_ERR_MSG(extack, "ESN attribute is too short to fit the full bitmap length"); + return -EINVAL; + } + + /* As only ESP and AH support ESN feature. */ + if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH)) { + NL_SET_ERR_MSG(extack, "ESN only supported for ESP and AH"); + return -EINVAL; + } + + if (p->replay_window != 0) { + NL_SET_ERR_MSG(extack, "ESN not compatible with legacy replay_window"); + return -EINVAL; + } + + return 0; +} + +static int verify_newsa_info(struct xfrm_usersa_info *p, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + int err; + + err = -EINVAL; + switch (p->family) { + case AF_INET: + break; + + case AF_INET6: +#if IS_ENABLED(CONFIG_IPV6) + break; +#else + err = -EAFNOSUPPORT; + NL_SET_ERR_MSG(extack, "IPv6 support disabled"); + goto out; +#endif + + default: + NL_SET_ERR_MSG(extack, "Invalid address family"); + goto out; + } + + switch (p->sel.family) { + case AF_UNSPEC: + break; + + case AF_INET: + if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { + NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); + goto out; + } + + break; + + case AF_INET6: +#if IS_ENABLED(CONFIG_IPV6) + if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { + NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); + goto out; + } + + break; +#else + NL_SET_ERR_MSG(extack, "IPv6 support disabled"); + err = -EAFNOSUPPORT; + goto out; +#endif + + default: + NL_SET_ERR_MSG(extack, "Invalid address family in selector"); + goto out; + } + + err = -EINVAL; + switch (p->id.proto) { + case IPPROTO_AH: + if (!attrs[XFRMA_ALG_AUTH] && + !attrs[XFRMA_ALG_AUTH_TRUNC]) { + NL_SET_ERR_MSG(extack, "Missing required attribute for AH: AUTH_TRUNC or AUTH"); + goto out; + } + + if (attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_ALG_COMP] || + attrs[XFRMA_TFCPAD]) { + NL_SET_ERR_MSG(extack, "Invalid attributes for AH: AEAD, CRYPT, COMP, TFCPAD"); + goto out; + } + break; + + case IPPROTO_ESP: + if (attrs[XFRMA_ALG_COMP]) { + NL_SET_ERR_MSG(extack, "Invalid attribute for ESP: COMP"); + goto out; + } + + if (!attrs[XFRMA_ALG_AUTH] && + !attrs[XFRMA_ALG_AUTH_TRUNC] && + !attrs[XFRMA_ALG_CRYPT] && + !attrs[XFRMA_ALG_AEAD]) { + NL_SET_ERR_MSG(extack, "Missing required attribute for ESP: at least one of AUTH, AUTH_TRUNC, CRYPT, AEAD"); + goto out; + } + + if ((attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_CRYPT]) && + attrs[XFRMA_ALG_AEAD]) { + NL_SET_ERR_MSG(extack, "Invalid attribute combination for ESP: AEAD can't be used with AUTH, AUTH_TRUNC, CRYPT"); + goto out; + } + + if (attrs[XFRMA_TFCPAD] && + p->mode != XFRM_MODE_TUNNEL) { + NL_SET_ERR_MSG(extack, "TFC padding can only be used in tunnel mode"); + goto out; + } + break; + + case IPPROTO_COMP: + if (!attrs[XFRMA_ALG_COMP]) { + NL_SET_ERR_MSG(extack, "Missing required attribute for COMP: COMP"); + goto out; + } + + if (attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_TFCPAD]) { + NL_SET_ERR_MSG(extack, "Invalid attributes for COMP: AEAD, AUTH, AUTH_TRUNC, CRYPT, TFCPAD"); + goto out; + } + + if (ntohl(p->id.spi) >= 0x10000) { + NL_SET_ERR_MSG(extack, "SPI is too large for COMP (must be < 0x10000)"); + goto out; + } + break; + +#if IS_ENABLED(CONFIG_IPV6) + case IPPROTO_DSTOPTS: + case IPPROTO_ROUTING: + if (attrs[XFRMA_ALG_COMP] || + attrs[XFRMA_ALG_AUTH] || + attrs[XFRMA_ALG_AUTH_TRUNC] || + attrs[XFRMA_ALG_AEAD] || + attrs[XFRMA_ALG_CRYPT] || + attrs[XFRMA_ENCAP] || + attrs[XFRMA_SEC_CTX] || + attrs[XFRMA_TFCPAD]) { + NL_SET_ERR_MSG(extack, "Invalid attributes for DSTOPTS/ROUTING"); + goto out; + } + + if (!attrs[XFRMA_COADDR]) { + NL_SET_ERR_MSG(extack, "Missing required COADDR attribute for DSTOPTS/ROUTING"); + goto out; + } + break; +#endif + + default: + NL_SET_ERR_MSG(extack, "Unsupported protocol"); + goto out; + } + + if ((err = verify_aead(attrs, extack))) + goto out; + if ((err = verify_auth_trunc(attrs, extack))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH, extack))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT, extack))) + goto out; + if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP, extack))) + goto out; + if ((err = verify_sec_ctx_len(attrs, extack))) + goto out; + if ((err = verify_replay(p, attrs, extack))) + goto out; + + err = -EINVAL; + switch (p->mode) { + case XFRM_MODE_TRANSPORT: + case XFRM_MODE_TUNNEL: + case XFRM_MODE_ROUTEOPTIMIZATION: + case XFRM_MODE_BEET: + break; + + default: + NL_SET_ERR_MSG(extack, "Unsupported mode"); + goto out; + } + + err = 0; + + if (attrs[XFRMA_MTIMER_THRESH]) { + if (!attrs[XFRMA_ENCAP]) { + NL_SET_ERR_MSG(extack, "MTIMER_THRESH attribute can only be set on ENCAP states"); + err = -EINVAL; + goto out; + } + } + +out: + return err; +} + +static int attach_one_algo(struct xfrm_algo **algpp, u8 *props, + struct xfrm_algo_desc *(*get_byname)(const char *, int), + struct nlattr *rta, struct netlink_ext_ack *extack) +{ + struct xfrm_algo *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = get_byname(ualg->alg_name, 1); + if (!algo) { + NL_SET_ERR_MSG(extack, "Requested COMP algorithm not found"); + return -ENOSYS; + } + *props = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + *algpp = p; + return 0; +} + +static int attach_crypt(struct xfrm_state *x, struct nlattr *rta, + struct netlink_ext_ack *extack) +{ + struct xfrm_algo *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_ealg_get_byname(ualg->alg_name, 1); + if (!algo) { + NL_SET_ERR_MSG(extack, "Requested CRYPT algorithm not found"); + return -ENOSYS; + } + x->props.ealgo = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + x->ealg = p; + x->geniv = algo->uinfo.encr.geniv; + return 0; +} + +static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props, + struct nlattr *rta, struct netlink_ext_ack *extack) +{ + struct xfrm_algo *ualg; + struct xfrm_algo_auth *p; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aalg_get_byname(ualg->alg_name, 1); + if (!algo) { + NL_SET_ERR_MSG(extack, "Requested AUTH algorithm not found"); + return -ENOSYS; + } + *props = algo->desc.sadb_alg_id; + + p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + p->alg_key_len = ualg->alg_key_len; + p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; + memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8); + + *algpp = p; + return 0; +} + +static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props, + struct nlattr *rta, struct netlink_ext_ack *extack) +{ + struct xfrm_algo_auth *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aalg_get_byname(ualg->alg_name, 1); + if (!algo) { + NL_SET_ERR_MSG(extack, "Requested AUTH_TRUNC algorithm not found"); + return -ENOSYS; + } + if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits) { + NL_SET_ERR_MSG(extack, "Invalid length requested for truncated ICV"); + return -EINVAL; + } + *props = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + if (!p->alg_trunc_len) + p->alg_trunc_len = algo->uinfo.auth.icv_truncbits; + + *algpp = p; + return 0; +} + +static int attach_aead(struct xfrm_state *x, struct nlattr *rta, + struct netlink_ext_ack *extack) +{ + struct xfrm_algo_aead *p, *ualg; + struct xfrm_algo_desc *algo; + + if (!rta) + return 0; + + ualg = nla_data(rta); + + algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1); + if (!algo) { + NL_SET_ERR_MSG(extack, "Requested AEAD algorithm not found"); + return -ENOSYS; + } + x->props.ealgo = algo->desc.sadb_alg_id; + + p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL); + if (!p) + return -ENOMEM; + + strcpy(p->alg_name, algo->name); + x->aead = p; + x->geniv = algo->uinfo.aead.geniv; + return 0; +} + +static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn, + struct nlattr *rp) +{ + struct xfrm_replay_state_esn *up; + unsigned int ulen; + + if (!replay_esn || !rp) + return 0; + + up = nla_data(rp); + ulen = xfrm_replay_state_esn_len(up); + + /* Check the overall length and the internal bitmap length to avoid + * potential overflow. */ + if (nla_len(rp) < (int)ulen || + xfrm_replay_state_esn_len(replay_esn) != ulen || + replay_esn->bmp_len != up->bmp_len) + return -EINVAL; + + if (up->replay_window > up->bmp_len * sizeof(__u32) * 8) + return -EINVAL; + + return 0; +} + +static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn, + struct xfrm_replay_state_esn **preplay_esn, + struct nlattr *rta) +{ + struct xfrm_replay_state_esn *p, *pp, *up; + unsigned int klen, ulen; + + if (!rta) + return 0; + + up = nla_data(rta); + klen = xfrm_replay_state_esn_len(up); + ulen = nla_len(rta) >= (int)klen ? klen : sizeof(*up); + + p = kzalloc(klen, GFP_KERNEL); + if (!p) + return -ENOMEM; + + pp = kzalloc(klen, GFP_KERNEL); + if (!pp) { + kfree(p); + return -ENOMEM; + } + + memcpy(p, up, ulen); + memcpy(pp, up, ulen); + + *replay_esn = p; + *preplay_esn = pp; + + return 0; +} + +static inline unsigned int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx) +{ + unsigned int len = 0; + + if (xfrm_ctx) { + len += sizeof(struct xfrm_user_sec_ctx); + len += xfrm_ctx->ctx_len; + } + return len; +} + +static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) +{ + memcpy(&x->id, &p->id, sizeof(x->id)); + memcpy(&x->sel, &p->sel, sizeof(x->sel)); + memcpy(&x->lft, &p->lft, sizeof(x->lft)); + x->props.mode = p->mode; + x->props.replay_window = min_t(unsigned int, p->replay_window, + sizeof(x->replay.bitmap) * 8); + x->props.reqid = p->reqid; + x->props.family = p->family; + memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr)); + x->props.flags = p->flags; + + if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC)) + x->sel.family = p->family; +} + +/* + * someday when pfkey also has support, we could have the code + * somehow made shareable and move it to xfrm_state.c - JHS + * +*/ +static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs, + int update_esn) +{ + struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; + struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL; + struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; + struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; + struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; + struct nlattr *mt = attrs[XFRMA_MTIMER_THRESH]; + + if (re && x->replay_esn && x->preplay_esn) { + struct xfrm_replay_state_esn *replay_esn; + replay_esn = nla_data(re); + memcpy(x->replay_esn, replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + memcpy(x->preplay_esn, replay_esn, + xfrm_replay_state_esn_len(replay_esn)); + } + + if (rp) { + struct xfrm_replay_state *replay; + replay = nla_data(rp); + memcpy(&x->replay, replay, sizeof(*replay)); + memcpy(&x->preplay, replay, sizeof(*replay)); + } + + if (lt) { + struct xfrm_lifetime_cur *ltime; + ltime = nla_data(lt); + x->curlft.bytes = ltime->bytes; + x->curlft.packets = ltime->packets; + x->curlft.add_time = ltime->add_time; + x->curlft.use_time = ltime->use_time; + } + + if (et) + x->replay_maxage = nla_get_u32(et); + + if (rt) + x->replay_maxdiff = nla_get_u32(rt); + + if (mt) + x->mapping_maxage = nla_get_u32(mt); +} + +static void xfrm_smark_init(struct nlattr **attrs, struct xfrm_mark *m) +{ + if (attrs[XFRMA_SET_MARK]) { + m->v = nla_get_u32(attrs[XFRMA_SET_MARK]); + if (attrs[XFRMA_SET_MARK_MASK]) + m->m = nla_get_u32(attrs[XFRMA_SET_MARK_MASK]); + else + m->m = 0xffffffff; + } else { + m->v = m->m = 0; + } +} + +static struct xfrm_state *xfrm_state_construct(struct net *net, + struct xfrm_usersa_info *p, + struct nlattr **attrs, + int *errp, + struct netlink_ext_ack *extack) +{ + struct xfrm_state *x = xfrm_state_alloc(net); + int err = -ENOMEM; + + if (!x) + goto error_no_put; + + copy_from_user_state(x, p); + + if (attrs[XFRMA_ENCAP]) { + x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), + sizeof(*x->encap), GFP_KERNEL); + if (x->encap == NULL) + goto error; + } + + if (attrs[XFRMA_COADDR]) { + x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]), + sizeof(*x->coaddr), GFP_KERNEL); + if (x->coaddr == NULL) + goto error; + } + + if (attrs[XFRMA_SA_EXTRA_FLAGS]) + x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]); + + if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD], extack))) + goto error; + if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo, + attrs[XFRMA_ALG_AUTH_TRUNC], extack))) + goto error; + if (!x->props.aalgo) { + if ((err = attach_auth(&x->aalg, &x->props.aalgo, + attrs[XFRMA_ALG_AUTH], extack))) + goto error; + } + if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT], extack))) + goto error; + if ((err = attach_one_algo(&x->calg, &x->props.calgo, + xfrm_calg_get_byname, + attrs[XFRMA_ALG_COMP], extack))) + goto error; + + if (attrs[XFRMA_TFCPAD]) + x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]); + + xfrm_mark_get(attrs, &x->mark); + + xfrm_smark_init(attrs, &x->props.smark); + + if (attrs[XFRMA_IF_ID]) + x->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack); + if (err) + goto error; + + if (attrs[XFRMA_SEC_CTX]) { + err = security_xfrm_state_alloc(x, + nla_data(attrs[XFRMA_SEC_CTX])); + if (err) + goto error; + } + + if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, + attrs[XFRMA_REPLAY_ESN_VAL]))) + goto error; + + x->km.seq = p->seq; + x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth; + /* sysctl_xfrm_aevent_etime is in 100ms units */ + x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M; + + if ((err = xfrm_init_replay(x, extack))) + goto error; + + /* override default values from above */ + xfrm_update_ae_params(x, attrs, 0); + + /* configure the hardware if offload is requested */ + if (attrs[XFRMA_OFFLOAD_DEV]) { + err = xfrm_dev_state_add(net, x, + nla_data(attrs[XFRMA_OFFLOAD_DEV]), + extack); + if (err) + goto error; + } + + return x; + +error: + x->km.state = XFRM_STATE_DEAD; + xfrm_state_put(x); +error_no_put: + *errp = err; + return NULL; +} + +static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_usersa_info *p = nlmsg_data(nlh); + struct xfrm_state *x; + int err; + struct km_event c; + + err = verify_newsa_info(p, attrs, extack); + if (err) + return err; + + x = xfrm_state_construct(net, p, attrs, &err, extack); + if (!x) + return err; + + xfrm_state_hold(x); + if (nlh->nlmsg_type == XFRM_MSG_NEWSA) + err = xfrm_state_add(x); + else + err = xfrm_state_update(x); + + xfrm_audit_state_add(x, err ? 0 : 1, true); + + if (err < 0) { + x->km.state = XFRM_STATE_DEAD; + xfrm_dev_state_delete(x); + __xfrm_state_put(x); + goto out; + } + + if (x->km.state == XFRM_STATE_VOID) + x->km.state = XFRM_STATE_VALID; + + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.event = nlh->nlmsg_type; + + km_state_notify(x, &c); +out: + xfrm_state_put(x); + return err; +} + +static struct xfrm_state *xfrm_user_state_lookup(struct net *net, + struct xfrm_usersa_id *p, + struct nlattr **attrs, + int *errp) +{ + struct xfrm_state *x = NULL; + struct xfrm_mark m; + int err; + u32 mark = xfrm_mark_get(attrs, &m); + + if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) { + err = -ESRCH; + x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family); + } else { + xfrm_address_t *saddr = NULL; + + verify_one_addr(attrs, XFRMA_SRCADDR, &saddr); + if (!saddr) { + err = -EINVAL; + goto out; + } + + err = -ESRCH; + x = xfrm_state_lookup_byaddr(net, mark, + &p->daddr, saddr, + p->proto, p->family); + } + + out: + if (!x && errp) + *errp = err; + return x; +} + +static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + int err = -ESRCH; + struct km_event c; + struct xfrm_usersa_id *p = nlmsg_data(nlh); + + x = xfrm_user_state_lookup(net, p, attrs, &err); + if (x == NULL) + return err; + + if ((err = security_xfrm_state_delete(x)) != 0) + goto out; + + if (xfrm_state_kern(x)) { + err = -EPERM; + goto out; + } + + err = xfrm_state_delete(x); + + if (err < 0) + goto out; + + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.event = nlh->nlmsg_type; + km_state_notify(x, &c); + +out: + xfrm_audit_state_delete(x, err ? 0 : 1, true); + xfrm_state_put(x); + return err; +} + +static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p) +{ + memset(p, 0, sizeof(*p)); + memcpy(&p->id, &x->id, sizeof(p->id)); + memcpy(&p->sel, &x->sel, sizeof(p->sel)); + memcpy(&p->lft, &x->lft, sizeof(p->lft)); + memcpy(&p->curlft, &x->curlft, sizeof(p->curlft)); + put_unaligned(x->stats.replay_window, &p->stats.replay_window); + put_unaligned(x->stats.replay, &p->stats.replay); + put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed); + memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr)); + p->mode = x->props.mode; + p->replay_window = x->props.replay_window; + p->reqid = x->props.reqid; + p->family = x->props.family; + p->flags = x->props.flags; + p->seq = x->km.seq; +} + +struct xfrm_dump_info { + struct sk_buff *in_skb; + struct sk_buff *out_skb; + u32 nlmsg_seq; + u16 nlmsg_flags; +}; + +static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) +{ + struct xfrm_user_sec_ctx *uctx; + struct nlattr *attr; + int ctx_size = sizeof(*uctx) + s->ctx_len; + + attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size); + if (attr == NULL) + return -EMSGSIZE; + + uctx = nla_data(attr); + uctx->exttype = XFRMA_SEC_CTX; + uctx->len = ctx_size; + uctx->ctx_doi = s->ctx_doi; + uctx->ctx_alg = s->ctx_alg; + uctx->ctx_len = s->ctx_len; + memcpy(uctx + 1, s->ctx_str, s->ctx_len); + + return 0; +} + +static int copy_user_offload(struct xfrm_dev_offload *xso, struct sk_buff *skb) +{ + struct xfrm_user_offload *xuo; + struct nlattr *attr; + + attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); + if (attr == NULL) + return -EMSGSIZE; + + xuo = nla_data(attr); + memset(xuo, 0, sizeof(*xuo)); + xuo->ifindex = xso->dev->ifindex; + if (xso->dir == XFRM_DEV_OFFLOAD_IN) + xuo->flags = XFRM_OFFLOAD_INBOUND; + + return 0; +} + +static bool xfrm_redact(void) +{ + return IS_ENABLED(CONFIG_SECURITY) && + security_locked_down(LOCKDOWN_XFRM_SECRET); +} + +static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) +{ + struct xfrm_algo *algo; + struct xfrm_algo_auth *ap; + struct nlattr *nla; + bool redact_secret = xfrm_redact(); + + nla = nla_reserve(skb, XFRMA_ALG_AUTH, + sizeof(*algo) + (auth->alg_key_len + 7) / 8); + if (!nla) + return -EMSGSIZE; + algo = nla_data(nla); + strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name)); + + if (redact_secret && auth->alg_key_len) + memset(algo->alg_key, 0, (auth->alg_key_len + 7) / 8); + else + memcpy(algo->alg_key, auth->alg_key, + (auth->alg_key_len + 7) / 8); + algo->alg_key_len = auth->alg_key_len; + + nla = nla_reserve(skb, XFRMA_ALG_AUTH_TRUNC, xfrm_alg_auth_len(auth)); + if (!nla) + return -EMSGSIZE; + ap = nla_data(nla); + memcpy(ap, auth, sizeof(struct xfrm_algo_auth)); + if (redact_secret && auth->alg_key_len) + memset(ap->alg_key, 0, (auth->alg_key_len + 7) / 8); + else + memcpy(ap->alg_key, auth->alg_key, + (auth->alg_key_len + 7) / 8); + return 0; +} + +static int copy_to_user_aead(struct xfrm_algo_aead *aead, struct sk_buff *skb) +{ + struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_AEAD, aead_len(aead)); + struct xfrm_algo_aead *ap; + bool redact_secret = xfrm_redact(); + + if (!nla) + return -EMSGSIZE; + + ap = nla_data(nla); + strscpy_pad(ap->alg_name, aead->alg_name, sizeof(ap->alg_name)); + ap->alg_key_len = aead->alg_key_len; + ap->alg_icv_len = aead->alg_icv_len; + + if (redact_secret && aead->alg_key_len) + memset(ap->alg_key, 0, (aead->alg_key_len + 7) / 8); + else + memcpy(ap->alg_key, aead->alg_key, + (aead->alg_key_len + 7) / 8); + return 0; +} + +static int copy_to_user_ealg(struct xfrm_algo *ealg, struct sk_buff *skb) +{ + struct xfrm_algo *ap; + bool redact_secret = xfrm_redact(); + struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_CRYPT, + xfrm_alg_len(ealg)); + if (!nla) + return -EMSGSIZE; + + ap = nla_data(nla); + strscpy_pad(ap->alg_name, ealg->alg_name, sizeof(ap->alg_name)); + ap->alg_key_len = ealg->alg_key_len; + + if (redact_secret && ealg->alg_key_len) + memset(ap->alg_key, 0, (ealg->alg_key_len + 7) / 8); + else + memcpy(ap->alg_key, ealg->alg_key, + (ealg->alg_key_len + 7) / 8); + + return 0; +} + +static int copy_to_user_calg(struct xfrm_algo *calg, struct sk_buff *skb) +{ + struct nlattr *nla = nla_reserve(skb, XFRMA_ALG_COMP, sizeof(*calg)); + struct xfrm_algo *ap; + + if (!nla) + return -EMSGSIZE; + + ap = nla_data(nla); + strscpy_pad(ap->alg_name, calg->alg_name, sizeof(ap->alg_name)); + ap->alg_key_len = 0; + + return 0; +} + +static int copy_to_user_encap(struct xfrm_encap_tmpl *ep, struct sk_buff *skb) +{ + struct nlattr *nla = nla_reserve(skb, XFRMA_ENCAP, sizeof(*ep)); + struct xfrm_encap_tmpl *uep; + + if (!nla) + return -EMSGSIZE; + + uep = nla_data(nla); + memset(uep, 0, sizeof(*uep)); + + uep->encap_type = ep->encap_type; + uep->encap_sport = ep->encap_sport; + uep->encap_dport = ep->encap_dport; + uep->encap_oa = ep->encap_oa; + + return 0; +} + +static int xfrm_smark_put(struct sk_buff *skb, struct xfrm_mark *m) +{ + int ret = 0; + + if (m->v | m->m) { + ret = nla_put_u32(skb, XFRMA_SET_MARK, m->v); + if (!ret) + ret = nla_put_u32(skb, XFRMA_SET_MARK_MASK, m->m); + } + return ret; +} + +/* Don't change this without updating xfrm_sa_len! */ +static int copy_to_user_state_extra(struct xfrm_state *x, + struct xfrm_usersa_info *p, + struct sk_buff *skb) +{ + int ret = 0; + + copy_to_user_state(x, p); + + if (x->props.extra_flags) { + ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS, + x->props.extra_flags); + if (ret) + goto out; + } + + if (x->coaddr) { + ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); + if (ret) + goto out; + } + if (x->lastused) { + ret = nla_put_u64_64bit(skb, XFRMA_LASTUSED, x->lastused, + XFRMA_PAD); + if (ret) + goto out; + } + if (x->aead) { + ret = copy_to_user_aead(x->aead, skb); + if (ret) + goto out; + } + if (x->aalg) { + ret = copy_to_user_auth(x->aalg, skb); + if (ret) + goto out; + } + if (x->ealg) { + ret = copy_to_user_ealg(x->ealg, skb); + if (ret) + goto out; + } + if (x->calg) { + ret = copy_to_user_calg(x->calg, skb); + if (ret) + goto out; + } + if (x->encap) { + ret = copy_to_user_encap(x->encap, skb); + if (ret) + goto out; + } + if (x->tfcpad) { + ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad); + if (ret) + goto out; + } + ret = xfrm_mark_put(skb, &x->mark); + if (ret) + goto out; + + ret = xfrm_smark_put(skb, &x->props.smark); + if (ret) + goto out; + + if (x->replay_esn) + ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL, + xfrm_replay_state_esn_len(x->replay_esn), + x->replay_esn); + else + ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), + &x->replay); + if (ret) + goto out; + if(x->xso.dev) + ret = copy_user_offload(&x->xso, skb); + if (ret) + goto out; + if (x->if_id) { + ret = nla_put_u32(skb, XFRMA_IF_ID, x->if_id); + if (ret) + goto out; + } + if (x->security) { + ret = copy_sec_ctx(x->security, skb); + if (ret) + goto out; + } + if (x->mapping_maxage) + ret = nla_put_u32(skb, XFRMA_MTIMER_THRESH, x->mapping_maxage); +out: + return ret; +} + +static int dump_one_state(struct xfrm_state *x, int count, void *ptr) +{ + struct xfrm_dump_info *sp = ptr; + struct sk_buff *in_skb = sp->in_skb; + struct sk_buff *skb = sp->out_skb; + struct xfrm_translator *xtr; + struct xfrm_usersa_info *p; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, + XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags); + if (nlh == NULL) + return -EMSGSIZE; + + p = nlmsg_data(nlh); + + err = copy_to_user_state_extra(x, p, skb); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + nlmsg_end(skb, nlh); + + xtr = xfrm_get_translator(); + if (xtr) { + err = xtr->alloc_compat(skb, nlh); + + xfrm_put_translator(xtr); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + } + + return 0; +} + +static int xfrm_dump_sa_done(struct netlink_callback *cb) +{ + struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; + struct sock *sk = cb->skb->sk; + struct net *net = sock_net(sk); + + if (cb->args[0]) + xfrm_state_walk_done(walk, net); + return 0; +} + +static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1]; + struct xfrm_dump_info info; + + BUILD_BUG_ON(sizeof(struct xfrm_state_walk) > + sizeof(cb->args) - sizeof(cb->args[0])); + + info.in_skb = cb->skb; + info.out_skb = skb; + info.nlmsg_seq = cb->nlh->nlmsg_seq; + info.nlmsg_flags = NLM_F_MULTI; + + if (!cb->args[0]) { + struct nlattr *attrs[XFRMA_MAX+1]; + struct xfrm_address_filter *filter = NULL; + u8 proto = 0; + int err; + + err = nlmsg_parse_deprecated(cb->nlh, 0, attrs, XFRMA_MAX, + xfrma_policy, cb->extack); + if (err < 0) + return err; + + if (attrs[XFRMA_ADDRESS_FILTER]) { + filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]), + sizeof(*filter), GFP_KERNEL); + if (filter == NULL) + return -ENOMEM; + + /* see addr_match(), (prefix length >> 5) << 2 + * will be used to compare xfrm_address_t + */ + if (filter->splen > (sizeof(xfrm_address_t) << 3) || + filter->dplen > (sizeof(xfrm_address_t) << 3)) { + kfree(filter); + return -EINVAL; + } + } + + if (attrs[XFRMA_PROTO]) + proto = nla_get_u8(attrs[XFRMA_PROTO]); + + xfrm_state_walk_init(walk, proto, filter); + cb->args[0] = 1; + } + + (void) xfrm_state_walk(net, walk, dump_one_state, &info); + + return skb->len; +} + +static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb, + struct xfrm_state *x, u32 seq) +{ + struct xfrm_dump_info info; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); + if (!skb) + return ERR_PTR(-ENOMEM); + + info.in_skb = in_skb; + info.out_skb = skb; + info.nlmsg_seq = seq; + info.nlmsg_flags = 0; + + err = dump_one_state(x, 0, &info); + if (err) { + kfree_skb(skb); + return ERR_PTR(err); + } + + return skb; +} + +/* A wrapper for nlmsg_multicast() checking that nlsk is still available. + * Must be called with RCU read lock. + */ +static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb, + u32 pid, unsigned int group) +{ + struct sock *nlsk = rcu_dereference(net->xfrm.nlsk); + struct xfrm_translator *xtr; + + if (!nlsk) { + kfree_skb(skb); + return -EPIPE; + } + + xtr = xfrm_get_translator(); + if (xtr) { + int err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); + + xfrm_put_translator(xtr); + if (err) { + kfree_skb(skb); + return err; + } + } + + return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC); +} + +static inline unsigned int xfrm_spdinfo_msgsize(void) +{ + return NLMSG_ALIGN(4) + + nla_total_size(sizeof(struct xfrmu_spdinfo)) + + nla_total_size(sizeof(struct xfrmu_spdhinfo)) + + nla_total_size(sizeof(struct xfrmu_spdhthresh)) + + nla_total_size(sizeof(struct xfrmu_spdhthresh)); +} + +static int build_spdinfo(struct sk_buff *skb, struct net *net, + u32 portid, u32 seq, u32 flags) +{ + struct xfrmk_spdinfo si; + struct xfrmu_spdinfo spc; + struct xfrmu_spdhinfo sph; + struct xfrmu_spdhthresh spt4, spt6; + struct nlmsghdr *nlh; + int err; + u32 *f; + unsigned lseq; + + nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0); + if (nlh == NULL) /* shouldn't really happen ... */ + return -EMSGSIZE; + + f = nlmsg_data(nlh); + *f = flags; + xfrm_spd_getinfo(net, &si); + spc.incnt = si.incnt; + spc.outcnt = si.outcnt; + spc.fwdcnt = si.fwdcnt; + spc.inscnt = si.inscnt; + spc.outscnt = si.outscnt; + spc.fwdscnt = si.fwdscnt; + sph.spdhcnt = si.spdhcnt; + sph.spdhmcnt = si.spdhmcnt; + + do { + lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock); + + spt4.lbits = net->xfrm.policy_hthresh.lbits4; + spt4.rbits = net->xfrm.policy_hthresh.rbits4; + spt6.lbits = net->xfrm.policy_hthresh.lbits6; + spt6.rbits = net->xfrm.policy_hthresh.rbits6; + } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq)); + + err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc); + if (!err) + err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph); + if (!err) + err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4); + if (!err) + err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrmu_spdhthresh *thresh4 = NULL; + struct xfrmu_spdhthresh *thresh6 = NULL; + + /* selector prefixlen thresholds to hash policies */ + if (attrs[XFRMA_SPD_IPV4_HTHRESH]) { + struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH]; + + if (nla_len(rta) < sizeof(*thresh4)) + return -EINVAL; + thresh4 = nla_data(rta); + if (thresh4->lbits > 32 || thresh4->rbits > 32) + return -EINVAL; + } + if (attrs[XFRMA_SPD_IPV6_HTHRESH]) { + struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH]; + + if (nla_len(rta) < sizeof(*thresh6)) + return -EINVAL; + thresh6 = nla_data(rta); + if (thresh6->lbits > 128 || thresh6->rbits > 128) + return -EINVAL; + } + + if (thresh4 || thresh6) { + write_seqlock(&net->xfrm.policy_hthresh.lock); + if (thresh4) { + net->xfrm.policy_hthresh.lbits4 = thresh4->lbits; + net->xfrm.policy_hthresh.rbits4 = thresh4->rbits; + } + if (thresh6) { + net->xfrm.policy_hthresh.lbits6 = thresh6->lbits; + net->xfrm.policy_hthresh.rbits6 = thresh6->rbits; + } + write_sequnlock(&net->xfrm.policy_hthresh.lock); + + xfrm_policy_hash_rebuild(net); + } + + return 0; +} + +static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct sk_buff *r_skb; + u32 *flags = nlmsg_data(nlh); + u32 sportid = NETLINK_CB(skb).portid; + u32 seq = nlh->nlmsg_seq; + int err; + + r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC); + if (r_skb == NULL) + return -ENOMEM; + + err = build_spdinfo(r_skb, net, sportid, seq, *flags); + BUG_ON(err < 0); + + return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); +} + +static inline unsigned int xfrm_sadinfo_msgsize(void) +{ + return NLMSG_ALIGN(4) + + nla_total_size(sizeof(struct xfrmu_sadhinfo)) + + nla_total_size(4); /* XFRMA_SAD_CNT */ +} + +static int build_sadinfo(struct sk_buff *skb, struct net *net, + u32 portid, u32 seq, u32 flags) +{ + struct xfrmk_sadinfo si; + struct xfrmu_sadhinfo sh; + struct nlmsghdr *nlh; + int err; + u32 *f; + + nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0); + if (nlh == NULL) /* shouldn't really happen ... */ + return -EMSGSIZE; + + f = nlmsg_data(nlh); + *f = flags; + xfrm_sad_getinfo(net, &si); + + sh.sadhmcnt = si.sadhmcnt; + sh.sadhcnt = si.sadhcnt; + + err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt); + if (!err) + err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct sk_buff *r_skb; + u32 *flags = nlmsg_data(nlh); + u32 sportid = NETLINK_CB(skb).portid; + u32 seq = nlh->nlmsg_seq; + int err; + + r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC); + if (r_skb == NULL) + return -ENOMEM; + + err = build_sadinfo(r_skb, net, sportid, seq, *flags); + BUG_ON(err < 0); + + return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid); +} + +static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_usersa_id *p = nlmsg_data(nlh); + struct xfrm_state *x; + struct sk_buff *resp_skb; + int err = -ESRCH; + + x = xfrm_user_state_lookup(net, p, attrs, &err); + if (x == NULL) + goto out_noput; + + resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + } else { + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); + } + xfrm_state_put(x); +out_noput: + return err; +} + +static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct xfrm_userspi_info *p; + struct xfrm_translator *xtr; + struct sk_buff *resp_skb; + xfrm_address_t *daddr; + int family; + int err; + u32 mark; + struct xfrm_mark m; + u32 if_id = 0; + + p = nlmsg_data(nlh); + err = verify_spi_info(p->info.id.proto, p->min, p->max); + if (err) + goto out_noput; + + family = p->info.family; + daddr = &p->info.id.daddr; + + x = NULL; + + mark = xfrm_mark_get(attrs, &m); + + if (attrs[XFRMA_IF_ID]) + if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + if (p->info.seq) { + x = xfrm_find_acq_byseq(net, mark, p->info.seq); + if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) { + xfrm_state_put(x); + x = NULL; + } + } + + if (!x) + x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid, + if_id, p->info.id.proto, daddr, + &p->info.saddr, 1, + family); + err = -ENOENT; + if (x == NULL) + goto out_noput; + + err = xfrm_alloc_spi(x, p->min, p->max); + if (err) + goto out; + + resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + goto out; + } + + xtr = xfrm_get_translator(); + if (xtr) { + err = xtr->alloc_compat(skb, nlmsg_hdr(skb)); + + xfrm_put_translator(xtr); + if (err) { + kfree_skb(resp_skb); + goto out; + } + } + + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid); + +out: + xfrm_state_put(x); +out_noput: + return err; +} + +static int verify_policy_dir(u8 dir, struct netlink_ext_ack *extack) +{ + switch (dir) { + case XFRM_POLICY_IN: + case XFRM_POLICY_OUT: + case XFRM_POLICY_FWD: + break; + + default: + NL_SET_ERR_MSG(extack, "Invalid policy direction"); + return -EINVAL; + } + + return 0; +} + +static int verify_policy_type(u8 type, struct netlink_ext_ack *extack) +{ + switch (type) { + case XFRM_POLICY_TYPE_MAIN: +#ifdef CONFIG_XFRM_SUB_POLICY + case XFRM_POLICY_TYPE_SUB: +#endif + break; + + default: + NL_SET_ERR_MSG(extack, "Invalid policy type"); + return -EINVAL; + } + + return 0; +} + +static int verify_newpolicy_info(struct xfrm_userpolicy_info *p, + struct netlink_ext_ack *extack) +{ + int ret; + + switch (p->share) { + case XFRM_SHARE_ANY: + case XFRM_SHARE_SESSION: + case XFRM_SHARE_USER: + case XFRM_SHARE_UNIQUE: + break; + + default: + NL_SET_ERR_MSG(extack, "Invalid policy share"); + return -EINVAL; + } + + switch (p->action) { + case XFRM_POLICY_ALLOW: + case XFRM_POLICY_BLOCK: + break; + + default: + NL_SET_ERR_MSG(extack, "Invalid policy action"); + return -EINVAL; + } + + switch (p->sel.family) { + case AF_INET: + if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32) { + NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 32 for IPv4)"); + return -EINVAL; + } + + break; + + case AF_INET6: +#if IS_ENABLED(CONFIG_IPV6) + if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128) { + NL_SET_ERR_MSG(extack, "Invalid prefix length in selector (must be <= 128 for IPv6)"); + return -EINVAL; + } + + break; +#else + NL_SET_ERR_MSG(extack, "IPv6 support disabled"); + return -EAFNOSUPPORT; +#endif + + default: + NL_SET_ERR_MSG(extack, "Invalid selector family"); + return -EINVAL; + } + + ret = verify_policy_dir(p->dir, extack); + if (ret) + return ret; + if (p->index && (xfrm_policy_id2dir(p->index) != p->dir)) { + NL_SET_ERR_MSG(extack, "Policy index doesn't match direction"); + return -EINVAL; + } + + return 0; +} + +static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs) +{ + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_user_sec_ctx *uctx; + + if (!rt) + return 0; + + uctx = nla_data(rt); + return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL); +} + +static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut, + int nr) +{ + int i; + + xp->xfrm_nr = nr; + for (i = 0; i < nr; i++, ut++) { + struct xfrm_tmpl *t = &xp->xfrm_vec[i]; + + memcpy(&t->id, &ut->id, sizeof(struct xfrm_id)); + memcpy(&t->saddr, &ut->saddr, + sizeof(xfrm_address_t)); + t->reqid = ut->reqid; + t->mode = ut->mode; + t->share = ut->share; + t->optional = ut->optional; + t->aalgos = ut->aalgos; + t->ealgos = ut->ealgos; + t->calgos = ut->calgos; + /* If all masks are ~0, then we allow all algorithms. */ + t->allalgs = !~(t->aalgos & t->ealgos & t->calgos); + t->encap_family = ut->family; + } +} + +static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family, + int dir, struct netlink_ext_ack *extack) +{ + u16 prev_family; + int i; + + if (nr > XFRM_MAX_DEPTH) { + NL_SET_ERR_MSG(extack, "Template count must be <= XFRM_MAX_DEPTH (" __stringify(XFRM_MAX_DEPTH) ")"); + return -EINVAL; + } + + prev_family = family; + + for (i = 0; i < nr; i++) { + /* We never validated the ut->family value, so many + * applications simply leave it at zero. The check was + * never made and ut->family was ignored because all + * templates could be assumed to have the same family as + * the policy itself. Now that we will have ipv4-in-ipv6 + * and ipv6-in-ipv4 tunnels, this is no longer true. + */ + if (!ut[i].family) + ut[i].family = family; + + switch (ut[i].mode) { + case XFRM_MODE_TUNNEL: + case XFRM_MODE_BEET: + if (ut[i].optional && dir == XFRM_POLICY_OUT) { + NL_SET_ERR_MSG(extack, "Mode in optional template not allowed in outbound policy"); + return -EINVAL; + } + break; + default: + if (ut[i].family != prev_family) { + NL_SET_ERR_MSG(extack, "Mode in template doesn't support a family change"); + return -EINVAL; + } + break; + } + if (ut[i].mode >= XFRM_MODE_MAX) { + NL_SET_ERR_MSG(extack, "Mode in template must be < XFRM_MODE_MAX (" __stringify(XFRM_MODE_MAX) ")"); + return -EINVAL; + } + + prev_family = ut[i].family; + + switch (ut[i].family) { + case AF_INET: + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + break; +#endif + default: + NL_SET_ERR_MSG(extack, "Invalid family in template"); + return -EINVAL; + } + + if (!xfrm_id_proto_valid(ut[i].id.proto)) { + NL_SET_ERR_MSG(extack, "Invalid XFRM protocol in template"); + return -EINVAL; + } + } + + return 0; +} + +static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs, + int dir, struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_TMPL]; + + if (!rt) { + pol->xfrm_nr = 0; + } else { + struct xfrm_user_tmpl *utmpl = nla_data(rt); + int nr = nla_len(rt) / sizeof(*utmpl); + int err; + + err = validate_tmpl(nr, utmpl, pol->family, dir, extack); + if (err) + return err; + + copy_templates(pol, utmpl, nr); + } + return 0; +} + +static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *rt = attrs[XFRMA_POLICY_TYPE]; + struct xfrm_userpolicy_type *upt; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + if (rt) { + upt = nla_data(rt); + type = upt->type; + } + + err = verify_policy_type(type, extack); + if (err) + return err; + + *tp = type; + return 0; +} + +static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p) +{ + xp->priority = p->priority; + xp->index = p->index; + memcpy(&xp->selector, &p->sel, sizeof(xp->selector)); + memcpy(&xp->lft, &p->lft, sizeof(xp->lft)); + xp->action = p->action; + xp->flags = p->flags; + xp->family = p->sel.family; + /* XXX xp->share = p->share; */ +} + +static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir) +{ + memset(p, 0, sizeof(*p)); + memcpy(&p->sel, &xp->selector, sizeof(p->sel)); + memcpy(&p->lft, &xp->lft, sizeof(p->lft)); + memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft)); + p->priority = xp->priority; + p->index = xp->index; + p->sel.family = xp->family; + p->dir = dir; + p->action = xp->action; + p->flags = xp->flags; + p->share = XFRM_SHARE_ANY; /* XXX xp->share */ +} + +static struct xfrm_policy *xfrm_policy_construct(struct net *net, + struct xfrm_userpolicy_info *p, + struct nlattr **attrs, + int *errp, + struct netlink_ext_ack *extack) +{ + struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL); + int err; + + if (!xp) { + *errp = -ENOMEM; + return NULL; + } + + copy_from_user_policy(xp, p); + + err = copy_from_user_policy_type(&xp->type, attrs, extack); + if (err) + goto error; + + if (!(err = copy_from_user_tmpl(xp, attrs, p->dir, extack))) + err = copy_from_user_sec_ctx(xp, attrs); + if (err) + goto error; + + xfrm_mark_get(attrs, &xp->mark); + + if (attrs[XFRMA_IF_ID]) + xp->if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + return xp; + error: + *errp = err; + xp->walk.dead = 1; + xfrm_policy_destroy(xp); + return NULL; +} + +static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_userpolicy_info *p = nlmsg_data(nlh); + struct xfrm_policy *xp; + struct km_event c; + int err; + int excl; + + err = verify_newpolicy_info(p, extack); + if (err) + return err; + err = verify_sec_ctx_len(attrs, extack); + if (err) + return err; + + xp = xfrm_policy_construct(net, p, attrs, &err, extack); + if (!xp) + return err; + + /* shouldn't excl be based on nlh flags?? + * Aha! this is anti-netlink really i.e more pfkey derived + * in netlink excl is a flag and you wouldn't need + * a type XFRM_MSG_UPDPOLICY - JHS */ + excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY; + err = xfrm_policy_insert(p->dir, xp, excl); + xfrm_audit_policy_add(xp, err ? 0 : 1, true); + + if (err) { + security_xfrm_policy_free(xp->security); + kfree(xp); + return err; + } + + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + km_policy_notify(xp, p->dir, &c); + + xfrm_pol_put(xp); + + return 0; +} + +static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb) +{ + struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH]; + int i; + + if (xp->xfrm_nr == 0) + return 0; + + for (i = 0; i < xp->xfrm_nr; i++) { + struct xfrm_user_tmpl *up = &vec[i]; + struct xfrm_tmpl *kp = &xp->xfrm_vec[i]; + + memset(up, 0, sizeof(*up)); + memcpy(&up->id, &kp->id, sizeof(up->id)); + up->family = kp->encap_family; + memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr)); + up->reqid = kp->reqid; + up->mode = kp->mode; + up->share = kp->share; + up->optional = kp->optional; + up->aalgos = kp->aalgos; + up->ealgos = kp->ealgos; + up->calgos = kp->calgos; + } + + return nla_put(skb, XFRMA_TMPL, + sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec); +} + +static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb) +{ + if (x->security) { + return copy_sec_ctx(x->security, skb); + } + return 0; +} + +static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb) +{ + if (xp->security) + return copy_sec_ctx(xp->security, skb); + return 0; +} +static inline unsigned int userpolicy_type_attrsize(void) +{ +#ifdef CONFIG_XFRM_SUB_POLICY + return nla_total_size(sizeof(struct xfrm_userpolicy_type)); +#else + return 0; +#endif +} + +#ifdef CONFIG_XFRM_SUB_POLICY +static int copy_to_user_policy_type(u8 type, struct sk_buff *skb) +{ + struct xfrm_userpolicy_type upt; + + /* Sadly there are two holes in struct xfrm_userpolicy_type */ + memset(&upt, 0, sizeof(upt)); + upt.type = type; + + return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt); +} + +#else +static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb) +{ + return 0; +} +#endif + +static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + struct xfrm_dump_info *sp = ptr; + struct xfrm_userpolicy_info *p; + struct sk_buff *in_skb = sp->in_skb; + struct sk_buff *skb = sp->out_skb; + struct xfrm_translator *xtr; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq, + XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags); + if (nlh == NULL) + return -EMSGSIZE; + + p = nlmsg_data(nlh); + copy_to_user_policy(xp, p, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_sec_ctx(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (!err) + err = xfrm_if_id_put(skb, xp->if_id); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + nlmsg_end(skb, nlh); + + xtr = xfrm_get_translator(); + if (xtr) { + err = xtr->alloc_compat(skb, nlh); + + xfrm_put_translator(xtr); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + } + + return 0; +} + +static int xfrm_dump_policy_done(struct netlink_callback *cb) +{ + struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; + struct net *net = sock_net(cb->skb->sk); + + xfrm_policy_walk_done(walk, net); + return 0; +} + +static int xfrm_dump_policy_start(struct netlink_callback *cb) +{ + struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; + + BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args)); + + xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY); + return 0; +} + +static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args; + struct xfrm_dump_info info; + + info.in_skb = cb->skb; + info.out_skb = skb; + info.nlmsg_seq = cb->nlh->nlmsg_seq; + info.nlmsg_flags = NLM_F_MULTI; + + (void) xfrm_policy_walk(net, walk, dump_one_policy, &info); + + return skb->len; +} + +static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb, + struct xfrm_policy *xp, + int dir, u32 seq) +{ + struct xfrm_dump_info info; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!skb) + return ERR_PTR(-ENOMEM); + + info.in_skb = in_skb; + info.out_skb = skb; + info.nlmsg_seq = seq; + info.nlmsg_flags = 0; + + err = dump_one_policy(xp, dir, 0, &info); + if (err) { + kfree_skb(skb); + return ERR_PTR(err); + } + + return skb; +} + +static int xfrm_notify_userpolicy(struct net *net) +{ + struct xfrm_userpolicy_default *up; + int len = NLMSG_ALIGN(sizeof(*up)); + struct nlmsghdr *nlh; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_GETDEFAULT, sizeof(*up), 0); + if (nlh == NULL) { + kfree_skb(skb); + return -EMSGSIZE; + } + + up = nlmsg_data(nlh); + up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; + up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; + up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; + + nlmsg_end(skb, nlh); + + rcu_read_lock(); + err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); + rcu_read_unlock(); + + return err; +} + +static bool xfrm_userpolicy_is_valid(__u8 policy) +{ + return policy == XFRM_USERPOLICY_BLOCK || + policy == XFRM_USERPOLICY_ACCEPT; +} + +static int xfrm_set_default(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_userpolicy_default *up = nlmsg_data(nlh); + + if (xfrm_userpolicy_is_valid(up->in)) + net->xfrm.policy_default[XFRM_POLICY_IN] = up->in; + + if (xfrm_userpolicy_is_valid(up->fwd)) + net->xfrm.policy_default[XFRM_POLICY_FWD] = up->fwd; + + if (xfrm_userpolicy_is_valid(up->out)) + net->xfrm.policy_default[XFRM_POLICY_OUT] = up->out; + + rt_genid_bump_all(net); + + xfrm_notify_userpolicy(net); + return 0; +} + +static int xfrm_get_default(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct sk_buff *r_skb; + struct nlmsghdr *r_nlh; + struct net *net = sock_net(skb->sk); + struct xfrm_userpolicy_default *r_up; + int len = NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_default)); + u32 portid = NETLINK_CB(skb).portid; + u32 seq = nlh->nlmsg_seq; + + r_skb = nlmsg_new(len, GFP_ATOMIC); + if (!r_skb) + return -ENOMEM; + + r_nlh = nlmsg_put(r_skb, portid, seq, XFRM_MSG_GETDEFAULT, sizeof(*r_up), 0); + if (!r_nlh) { + kfree_skb(r_skb); + return -EMSGSIZE; + } + + r_up = nlmsg_data(r_nlh); + r_up->in = net->xfrm.policy_default[XFRM_POLICY_IN]; + r_up->fwd = net->xfrm.policy_default[XFRM_POLICY_FWD]; + r_up->out = net->xfrm.policy_default[XFRM_POLICY_OUT]; + nlmsg_end(r_skb, r_nlh); + + return nlmsg_unicast(net->xfrm.nlsk, r_skb, portid); +} + +static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_userpolicy_id *p; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + struct km_event c; + int delete; + struct xfrm_mark m; + u32 if_id = 0; + + p = nlmsg_data(nlh); + delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY; + + err = copy_from_user_policy_type(&type, attrs, extack); + if (err) + return err; + + err = verify_policy_dir(p->dir, extack); + if (err) + return err; + + if (attrs[XFRMA_IF_ID]) + if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + xfrm_mark_get(attrs, &m); + + if (p->index) + xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, + p->index, delete, &err); + else { + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_sec_ctx *ctx; + + err = verify_sec_ctx_len(attrs, extack); + if (err) + return err; + + ctx = NULL; + if (rt) { + struct xfrm_user_sec_ctx *uctx = nla_data(rt); + + err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); + if (err) + return err; + } + xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, + &p->sel, ctx, delete, &err); + security_xfrm_policy_free(ctx); + } + if (xp == NULL) + return -ENOENT; + + if (!delete) { + struct sk_buff *resp_skb; + + resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq); + if (IS_ERR(resp_skb)) { + err = PTR_ERR(resp_skb); + } else { + err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, + NETLINK_CB(skb).portid); + } + } else { + xfrm_audit_policy_delete(xp, err ? 0 : 1, true); + + if (err != 0) + goto out; + + c.data.byid = p->index; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + km_policy_notify(xp, p->dir, &c); + } + +out: + xfrm_pol_put(xp); + return err; +} + +static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct km_event c; + struct xfrm_usersa_flush *p = nlmsg_data(nlh); + int err; + + err = xfrm_state_flush(net, p->proto, true, false); + if (err) { + if (err == -ESRCH) /* empty table */ + return 0; + return err; + } + c.data.proto = p->proto; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.net = net; + km_state_notify(NULL, &c); + + return 0; +} + +static inline unsigned int xfrm_aevent_msgsize(struct xfrm_state *x) +{ + unsigned int replay_size = x->replay_esn ? + xfrm_replay_state_esn_len(x->replay_esn) : + sizeof(struct xfrm_replay_state); + + return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id)) + + nla_total_size(replay_size) + + nla_total_size_64bit(sizeof(struct xfrm_lifetime_cur)) + + nla_total_size(sizeof(struct xfrm_mark)) + + nla_total_size(4) /* XFRM_AE_RTHR */ + + nla_total_size(4); /* XFRM_AE_ETHR */ +} + +static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_aevent_id *id; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0); + if (nlh == NULL) + return -EMSGSIZE; + + id = nlmsg_data(nlh); + memset(&id->sa_id, 0, sizeof(id->sa_id)); + memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr)); + id->sa_id.spi = x->id.spi; + id->sa_id.family = x->props.family; + id->sa_id.proto = x->id.proto; + memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr)); + id->reqid = x->props.reqid; + id->flags = c->data.aevent; + + if (x->replay_esn) { + err = nla_put(skb, XFRMA_REPLAY_ESN_VAL, + xfrm_replay_state_esn_len(x->replay_esn), + x->replay_esn); + } else { + err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), + &x->replay); + } + if (err) + goto out_cancel; + err = nla_put_64bit(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft, + XFRMA_PAD); + if (err) + goto out_cancel; + + if (id->flags & XFRM_AE_RTHR) { + err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff); + if (err) + goto out_cancel; + } + if (id->flags & XFRM_AE_ETHR) { + err = nla_put_u32(skb, XFRMA_ETIMER_THRESH, + x->replay_maxage * 10 / HZ); + if (err) + goto out_cancel; + } + err = xfrm_mark_put(skb, &x->mark); + if (err) + goto out_cancel; + + err = xfrm_if_id_put(skb, x->if_id); + if (err) + goto out_cancel; + + nlmsg_end(skb, nlh); + return 0; + +out_cancel: + nlmsg_cancel(skb, nlh); + return err; +} + +static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct sk_buff *r_skb; + int err; + struct km_event c; + u32 mark; + struct xfrm_mark m; + struct xfrm_aevent_id *p = nlmsg_data(nlh); + struct xfrm_usersa_id *id = &p->sa_id; + + mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family); + if (x == NULL) + return -ESRCH; + + r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); + if (r_skb == NULL) { + xfrm_state_put(x); + return -ENOMEM; + } + + /* + * XXX: is this lock really needed - none of the other + * gets lock (the concern is things getting updated + * while we are still reading) - jhs + */ + spin_lock_bh(&x->lock); + c.data.aevent = p->flags; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + + err = build_aevent(r_skb, x, &c); + BUG_ON(err < 0); + + err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid); + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return err; +} + +static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + struct km_event c; + int err = -EINVAL; + u32 mark = 0; + struct xfrm_mark m; + struct xfrm_aevent_id *p = nlmsg_data(nlh); + struct nlattr *rp = attrs[XFRMA_REPLAY_VAL]; + struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL]; + struct nlattr *lt = attrs[XFRMA_LTIME_VAL]; + struct nlattr *et = attrs[XFRMA_ETIMER_THRESH]; + struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH]; + + if (!lt && !rp && !re && !et && !rt) + return err; + + /* pedantic mode - thou shalt sayeth replaceth */ + if (!(nlh->nlmsg_flags&NLM_F_REPLACE)) + return err; + + mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family); + if (x == NULL) + return -ESRCH; + + if (x->km.state != XFRM_STATE_VALID) + goto out; + + err = xfrm_replay_verify_len(x->replay_esn, re); + if (err) + goto out; + + spin_lock_bh(&x->lock); + xfrm_update_ae_params(x, attrs, 1); + spin_unlock_bh(&x->lock); + + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.data.aevent = XFRM_AE_CU; + km_state_notify(x, &c); + err = 0; +out: + xfrm_state_put(x); + return err; +} + +static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct km_event c; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err; + + err = copy_from_user_policy_type(&type, attrs, extack); + if (err) + return err; + + err = xfrm_policy_flush(net, type, true); + if (err) { + if (err == -ESRCH) /* empty table */ + return 0; + return err; + } + + c.data.type = type; + c.event = nlh->nlmsg_type; + c.seq = nlh->nlmsg_seq; + c.portid = nlh->nlmsg_pid; + c.net = net; + km_policy_notify(NULL, 0, &c); + return 0; +} + +static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_user_polexpire *up = nlmsg_data(nlh); + struct xfrm_userpolicy_info *p = &up->pol; + u8 type = XFRM_POLICY_TYPE_MAIN; + int err = -ENOENT; + struct xfrm_mark m; + u32 if_id = 0; + + err = copy_from_user_policy_type(&type, attrs, extack); + if (err) + return err; + + err = verify_policy_dir(p->dir, extack); + if (err) + return err; + + if (attrs[XFRMA_IF_ID]) + if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + xfrm_mark_get(attrs, &m); + + if (p->index) + xp = xfrm_policy_byid(net, &m, if_id, type, p->dir, p->index, + 0, &err); + else { + struct nlattr *rt = attrs[XFRMA_SEC_CTX]; + struct xfrm_sec_ctx *ctx; + + err = verify_sec_ctx_len(attrs, extack); + if (err) + return err; + + ctx = NULL; + if (rt) { + struct xfrm_user_sec_ctx *uctx = nla_data(rt); + + err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL); + if (err) + return err; + } + xp = xfrm_policy_bysel_ctx(net, &m, if_id, type, p->dir, + &p->sel, ctx, 0, &err); + security_xfrm_policy_free(ctx); + } + if (xp == NULL) + return -ENOENT; + + if (unlikely(xp->walk.dead)) + goto out; + + err = 0; + if (up->hard) { + xfrm_policy_delete(xp, p->dir); + xfrm_audit_policy_delete(xp, 1, true); + } + km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid); + +out: + xfrm_pol_put(xp); + return err; +} + +static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_state *x; + int err; + struct xfrm_user_expire *ue = nlmsg_data(nlh); + struct xfrm_usersa_info *p = &ue->state; + struct xfrm_mark m; + u32 mark = xfrm_mark_get(attrs, &m); + + x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family); + + err = -ENOENT; + if (x == NULL) + return err; + + spin_lock_bh(&x->lock); + err = -EINVAL; + if (x->km.state != XFRM_STATE_VALID) + goto out; + km_state_expired(x, ue->hard, nlh->nlmsg_pid); + + if (ue->hard) { + __xfrm_state_delete(x); + xfrm_audit_state_delete(x, 1, true); + } + err = 0; +out: + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return err; +} + +static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct xfrm_policy *xp; + struct xfrm_user_tmpl *ut; + int i; + struct nlattr *rt = attrs[XFRMA_TMPL]; + struct xfrm_mark mark; + + struct xfrm_user_acquire *ua = nlmsg_data(nlh); + struct xfrm_state *x = xfrm_state_alloc(net); + int err = -ENOMEM; + + if (!x) + goto nomem; + + xfrm_mark_get(attrs, &mark); + + err = verify_newpolicy_info(&ua->policy, extack); + if (err) + goto free_state; + err = verify_sec_ctx_len(attrs, extack); + if (err) + goto free_state; + + /* build an XP */ + xp = xfrm_policy_construct(net, &ua->policy, attrs, &err, extack); + if (!xp) + goto free_state; + + memcpy(&x->id, &ua->id, sizeof(ua->id)); + memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr)); + memcpy(&x->sel, &ua->sel, sizeof(ua->sel)); + xp->mark.m = x->mark.m = mark.m; + xp->mark.v = x->mark.v = mark.v; + ut = nla_data(rt); + /* extract the templates and for each call km_key */ + for (i = 0; i < xp->xfrm_nr; i++, ut++) { + struct xfrm_tmpl *t = &xp->xfrm_vec[i]; + memcpy(&x->id, &t->id, sizeof(x->id)); + x->props.mode = t->mode; + x->props.reqid = t->reqid; + x->props.family = ut->family; + t->aalgos = ua->aalgos; + t->ealgos = ua->ealgos; + t->calgos = ua->calgos; + err = km_query(x, t, xp); + + } + + xfrm_state_free(x); + kfree(xp); + + return 0; + +free_state: + xfrm_state_free(x); +nomem: + return err; +} + +#ifdef CONFIG_XFRM_MIGRATE +static int copy_from_user_migrate(struct xfrm_migrate *ma, + struct xfrm_kmaddress *k, + struct nlattr **attrs, int *num) +{ + struct nlattr *rt = attrs[XFRMA_MIGRATE]; + struct xfrm_user_migrate *um; + int i, num_migrate; + + if (k != NULL) { + struct xfrm_user_kmaddress *uk; + + uk = nla_data(attrs[XFRMA_KMADDRESS]); + memcpy(&k->local, &uk->local, sizeof(k->local)); + memcpy(&k->remote, &uk->remote, sizeof(k->remote)); + k->family = uk->family; + k->reserved = uk->reserved; + } + + um = nla_data(rt); + num_migrate = nla_len(rt) / sizeof(*um); + + if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH) + return -EINVAL; + + for (i = 0; i < num_migrate; i++, um++, ma++) { + memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr)); + memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr)); + memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr)); + memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr)); + + ma->proto = um->proto; + ma->mode = um->mode; + ma->reqid = um->reqid; + + ma->old_family = um->old_family; + ma->new_family = um->new_family; + } + + *num = i; + return 0; +} + +static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + struct xfrm_userpolicy_id *pi = nlmsg_data(nlh); + struct xfrm_migrate m[XFRM_MAX_DEPTH]; + struct xfrm_kmaddress km, *kmp; + u8 type; + int err; + int n = 0; + struct net *net = sock_net(skb->sk); + struct xfrm_encap_tmpl *encap = NULL; + u32 if_id = 0; + + if (attrs[XFRMA_MIGRATE] == NULL) + return -EINVAL; + + kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL; + + err = copy_from_user_policy_type(&type, attrs, extack); + if (err) + return err; + + err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n); + if (err) + return err; + + if (!n) + return 0; + + if (attrs[XFRMA_ENCAP]) { + encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]), + sizeof(*encap), GFP_KERNEL); + if (!encap) + return -ENOMEM; + } + + if (attrs[XFRMA_IF_ID]) + if_id = nla_get_u32(attrs[XFRMA_IF_ID]); + + err = xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net, encap, if_id); + + kfree(encap); + + return err; +} +#else +static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh, + struct nlattr **attrs, struct netlink_ext_ack *extack) +{ + return -ENOPROTOOPT; +} +#endif + +#ifdef CONFIG_XFRM_MIGRATE +static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb) +{ + struct xfrm_user_migrate um; + + memset(&um, 0, sizeof(um)); + um.proto = m->proto; + um.mode = m->mode; + um.reqid = m->reqid; + um.old_family = m->old_family; + memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr)); + memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr)); + um.new_family = m->new_family; + memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr)); + memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr)); + + return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um); +} + +static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb) +{ + struct xfrm_user_kmaddress uk; + + memset(&uk, 0, sizeof(uk)); + uk.family = k->family; + uk.reserved = k->reserved; + memcpy(&uk.local, &k->local, sizeof(uk.local)); + memcpy(&uk.remote, &k->remote, sizeof(uk.remote)); + + return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk); +} + +static inline unsigned int xfrm_migrate_msgsize(int num_migrate, int with_kma, + int with_encp) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id)) + + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0) + + (with_encp ? nla_total_size(sizeof(struct xfrm_encap_tmpl)) : 0) + + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate) + + userpolicy_type_attrsize(); +} + +static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m, + int num_migrate, const struct xfrm_kmaddress *k, + const struct xfrm_selector *sel, + const struct xfrm_encap_tmpl *encap, u8 dir, u8 type) +{ + const struct xfrm_migrate *mp; + struct xfrm_userpolicy_id *pol_id; + struct nlmsghdr *nlh; + int i, err; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0); + if (nlh == NULL) + return -EMSGSIZE; + + pol_id = nlmsg_data(nlh); + /* copy data from selector, dir, and type to the pol_id */ + memset(pol_id, 0, sizeof(*pol_id)); + memcpy(&pol_id->sel, sel, sizeof(pol_id->sel)); + pol_id->dir = dir; + + if (k != NULL) { + err = copy_to_user_kmaddress(k, skb); + if (err) + goto out_cancel; + } + if (encap) { + err = nla_put(skb, XFRMA_ENCAP, sizeof(*encap), encap); + if (err) + goto out_cancel; + } + err = copy_to_user_policy_type(type, skb); + if (err) + goto out_cancel; + for (i = 0, mp = m ; i < num_migrate; i++, mp++) { + err = copy_to_user_migrate(mp, skb); + if (err) + goto out_cancel; + } + + nlmsg_end(skb, nlh); + return 0; + +out_cancel: + nlmsg_cancel(skb, nlh); + return err; +} + +static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap) +{ + struct net *net = &init_net; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k, !!encap), + GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + /* build migrate */ + err = build_migrate(skb, m, num_migrate, k, sel, encap, dir, type); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE); +} +#else +static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_migrate, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap) +{ + return -ENOPROTOOPT; +} +#endif + +#define XMSGSIZE(type) sizeof(struct type) + +const int xfrm_msg_min[XFRM_NR_MSGTYPES] = { + [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), + [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id), + [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), + [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info), + [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire), + [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire), + [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info), + [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info), + [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire), + [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush), + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0, + [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id), + [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report), + [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id), + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32), + [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), + [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_default), +}; +EXPORT_SYMBOL_GPL(xfrm_msg_min); + +#undef XMSGSIZE + +const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { + [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)}, + [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)}, + [XFRMA_LASTUSED] = { .type = NLA_U64}, + [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)}, + [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) }, + [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) }, + [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) }, + [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) }, + [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_user_sec_ctx) }, + [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) }, + [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) }, + [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 }, + [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 }, + [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) }, + [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)}, + [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) }, + [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) }, + [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) }, + [XFRMA_TFCPAD] = { .type = NLA_U32 }, + [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) }, + [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, + [XFRMA_PROTO] = { .type = NLA_U8 }, + [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, + [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, + [XFRMA_SET_MARK] = { .type = NLA_U32 }, + [XFRMA_SET_MARK_MASK] = { .type = NLA_U32 }, + [XFRMA_IF_ID] = { .type = NLA_U32 }, + [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, +}; +EXPORT_SYMBOL_GPL(xfrma_policy); + +static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { + [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, + [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) }, +}; + +static const struct xfrm_link { + int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **, + struct netlink_ext_ack *); + int (*start)(struct netlink_callback *); + int (*dump)(struct sk_buff *, struct netlink_callback *); + int (*done)(struct netlink_callback *); + const struct nla_policy *nla_pol; + int nla_max; +} xfrm_dispatch[XFRM_NR_MSGTYPES] = { + [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, + [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa }, + [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa, + .dump = xfrm_dump_sa, + .done = xfrm_dump_sa_done }, + [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, + [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy }, + [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy, + .start = xfrm_dump_policy_start, + .dump = xfrm_dump_policy, + .done = xfrm_dump_policy_done }, + [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi }, + [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire }, + [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire }, + [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy }, + [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa }, + [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire}, + [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa }, + [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy }, + [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae }, + [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae }, + [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate }, + [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo }, + [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo, + .nla_pol = xfrma_spd_policy, + .nla_max = XFRMA_SPD_MAX }, + [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo }, + [XFRM_MSG_SETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_set_default }, + [XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default }, +}; + +static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct nlattr *attrs[XFRMA_MAX+1]; + const struct xfrm_link *link; + struct nlmsghdr *nlh64 = NULL; + int type, err; + + type = nlh->nlmsg_type; + if (type > XFRM_MSG_MAX) + return -EINVAL; + + type -= XFRM_MSG_BASE; + link = &xfrm_dispatch[type]; + + /* All operations require privileges, even GET */ + if (!netlink_net_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + if (in_compat_syscall()) { + struct xfrm_translator *xtr = xfrm_get_translator(); + + if (!xtr) + return -EOPNOTSUPP; + + nlh64 = xtr->rcv_msg_compat(nlh, link->nla_max, + link->nla_pol, extack); + xfrm_put_translator(xtr); + if (IS_ERR(nlh64)) + return PTR_ERR(nlh64); + if (nlh64) + nlh = nlh64; + } + + if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) || + type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) && + (nlh->nlmsg_flags & NLM_F_DUMP)) { + struct netlink_dump_control c = { + .start = link->start, + .dump = link->dump, + .done = link->done, + }; + + if (link->dump == NULL) { + err = -EINVAL; + goto err; + } + + err = netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c); + goto err; + } + + err = nlmsg_parse_deprecated(nlh, xfrm_msg_min[type], attrs, + link->nla_max ? : XFRMA_MAX, + link->nla_pol ? : xfrma_policy, extack); + if (err < 0) + goto err; + + if (link->doit == NULL) { + err = -EINVAL; + goto err; + } + + err = link->doit(skb, nlh, attrs, extack); + + /* We need to free skb allocated in xfrm_alloc_compat() before + * returning from this function, because consume_skb() won't take + * care of frag_list since netlink destructor sets + * sbk->head to NULL. (see netlink_skb_destructor()) + */ + if (skb_has_frag_list(skb)) { + kfree_skb(skb_shinfo(skb)->frag_list); + skb_shinfo(skb)->frag_list = NULL; + } + +err: + kvfree(nlh64); + return err; +} + +static void xfrm_netlink_rcv(struct sk_buff *skb) +{ + struct net *net = sock_net(skb->sk); + + mutex_lock(&net->xfrm.xfrm_cfg_mutex); + netlink_rcv_skb(skb, &xfrm_user_rcv_msg); + mutex_unlock(&net->xfrm.xfrm_cfg_mutex); +} + +static inline unsigned int xfrm_expire_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_expire)) + + nla_total_size(sizeof(struct xfrm_mark)); +} + +static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c) +{ + struct xfrm_user_expire *ue; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ue = nlmsg_data(nlh); + copy_to_user_state(x, &ue->state); + ue->hard = (c->data.hard != 0) ? 1 : 0; + /* clear the padding bytes */ + memset_after(ue, 0, hard); + + err = xfrm_mark_put(skb, &x->mark); + if (err) + return err; + + err = xfrm_if_id_put(skb, x->if_id); + if (err) + return err; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + + skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + if (build_expire(skb, x, c) < 0) { + kfree_skb(skb); + return -EMSGSIZE; + } + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); +} + +static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + int err; + + skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + err = build_aevent(skb, x, c); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS); +} + +static int xfrm_notify_sa_flush(const struct km_event *c) +{ + struct net *net = c->net; + struct xfrm_usersa_flush *p; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush)); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0); + if (nlh == NULL) { + kfree_skb(skb); + return -EMSGSIZE; + } + + p = nlmsg_data(nlh); + p->proto = c->data.proto; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); +} + +static inline unsigned int xfrm_sa_len(struct xfrm_state *x) +{ + unsigned int l = 0; + if (x->aead) + l += nla_total_size(aead_len(x->aead)); + if (x->aalg) { + l += nla_total_size(sizeof(struct xfrm_algo) + + (x->aalg->alg_key_len + 7) / 8); + l += nla_total_size(xfrm_alg_auth_len(x->aalg)); + } + if (x->ealg) + l += nla_total_size(xfrm_alg_len(x->ealg)); + if (x->calg) + l += nla_total_size(sizeof(*x->calg)); + if (x->encap) + l += nla_total_size(sizeof(*x->encap)); + if (x->tfcpad) + l += nla_total_size(sizeof(x->tfcpad)); + if (x->replay_esn) + l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn)); + else + l += nla_total_size(sizeof(struct xfrm_replay_state)); + if (x->security) + l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) + + x->security->ctx_len); + if (x->coaddr) + l += nla_total_size(sizeof(*x->coaddr)); + if (x->props.extra_flags) + l += nla_total_size(sizeof(x->props.extra_flags)); + if (x->xso.dev) + l += nla_total_size(sizeof(struct xfrm_user_offload)); + if (x->props.smark.v | x->props.smark.m) { + l += nla_total_size(sizeof(x->props.smark.v)); + l += nla_total_size(sizeof(x->props.smark.m)); + } + if (x->if_id) + l += nla_total_size(sizeof(x->if_id)); + + /* Must count x->lastused as it may become non-zero behind our back. */ + l += nla_total_size_64bit(sizeof(u64)); + + if (x->mapping_maxage) + l += nla_total_size(sizeof(x->mapping_maxage)); + + return l; +} + +static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = xs_net(x); + struct xfrm_usersa_info *p; + struct xfrm_usersa_id *id; + struct nlmsghdr *nlh; + struct sk_buff *skb; + unsigned int len = xfrm_sa_len(x); + unsigned int headlen; + int err; + + headlen = sizeof(*p); + if (c->event == XFRM_MSG_DELSA) { + len += nla_total_size(headlen); + headlen = sizeof(*id); + len += nla_total_size(sizeof(struct xfrm_mark)); + } + len += NLMSG_ALIGN(headlen); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + + p = nlmsg_data(nlh); + if (c->event == XFRM_MSG_DELSA) { + struct nlattr *attr; + + id = nlmsg_data(nlh); + memset(id, 0, sizeof(*id)); + memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr)); + id->spi = x->id.spi; + id->family = x->props.family; + id->proto = x->id.proto; + + attr = nla_reserve(skb, XFRMA_SA, sizeof(*p)); + err = -EMSGSIZE; + if (attr == NULL) + goto out_free_skb; + + p = nla_data(attr); + } + err = copy_to_user_state_extra(x, p, skb); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c) +{ + + switch (c->event) { + case XFRM_MSG_EXPIRE: + return xfrm_exp_state_notify(x, c); + case XFRM_MSG_NEWAE: + return xfrm_aevent_state_notify(x, c); + case XFRM_MSG_DELSA: + case XFRM_MSG_UPDSA: + case XFRM_MSG_NEWSA: + return xfrm_notify_sa(x, c); + case XFRM_MSG_FLUSHSA: + return xfrm_notify_sa_flush(c); + default: + printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n", + c->event); + break; + } + + return 0; + +} + +static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x, + struct xfrm_policy *xp) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire)) + + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) + + nla_total_size(sizeof(struct xfrm_mark)) + + nla_total_size(xfrm_user_sec_ctx_size(x->security)) + + userpolicy_type_attrsize(); +} + +static int build_acquire(struct sk_buff *skb, struct xfrm_state *x, + struct xfrm_tmpl *xt, struct xfrm_policy *xp) +{ + __u32 seq = xfrm_get_acqseq(); + struct xfrm_user_acquire *ua; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ua = nlmsg_data(nlh); + memcpy(&ua->id, &x->id, sizeof(ua->id)); + memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr)); + memcpy(&ua->sel, &x->sel, sizeof(ua->sel)); + copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT); + ua->aalgos = xt->aalgos; + ua->ealgos = xt->ealgos; + ua->calgos = xt->calgos; + ua->seq = x->km.seq = seq; + + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_state_sec_ctx(x, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (!err) + err = xfrm_if_id_put(skb, xp->if_id); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt, + struct xfrm_policy *xp) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + int err; + + skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + err = build_acquire(skb, x, xt, xp); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE); +} + +/* User gives us xfrm_user_policy_info followed by an array of 0 + * or more templates. + */ +static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt, + u8 *data, int len, int *dir) +{ + struct net *net = sock_net(sk); + struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data; + struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1); + struct xfrm_policy *xp; + int nr; + + switch (sk->sk_family) { + case AF_INET: + if (opt != IP_XFRM_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + if (opt != IPV6_XFRM_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#endif + default: + *dir = -EINVAL; + return NULL; + } + + *dir = -EINVAL; + + if (len < sizeof(*p) || + verify_newpolicy_info(p, NULL)) + return NULL; + + nr = ((len - sizeof(*p)) / sizeof(*ut)); + if (validate_tmpl(nr, ut, p->sel.family, p->dir, NULL)) + return NULL; + + if (p->dir > XFRM_POLICY_OUT) + return NULL; + + xp = xfrm_policy_alloc(net, GFP_ATOMIC); + if (xp == NULL) { + *dir = -ENOBUFS; + return NULL; + } + + copy_from_user_policy(xp, p); + xp->type = XFRM_POLICY_TYPE_MAIN; + copy_templates(xp, ut, nr); + + *dir = p->dir; + + return xp; +} + +static inline unsigned int xfrm_polexpire_msgsize(struct xfrm_policy *xp) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire)) + + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr) + + nla_total_size(xfrm_user_sec_ctx_size(xp->security)) + + nla_total_size(sizeof(struct xfrm_mark)) + + userpolicy_type_attrsize(); +} + +static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp, + int dir, const struct km_event *c) +{ + struct xfrm_user_polexpire *upe; + int hard = c->data.hard; + struct nlmsghdr *nlh; + int err; + + nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0); + if (nlh == NULL) + return -EMSGSIZE; + + upe = nlmsg_data(nlh); + copy_to_user_policy(xp, &upe->pol, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_sec_ctx(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (!err) + err = xfrm_if_id_put(skb, xp->if_id); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + upe->hard = !!hard; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct net *net = xp_net(xp); + struct sk_buff *skb; + int err; + + skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + err = build_polexpire(skb, xp, dir, c); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE); +} + +static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + unsigned int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr); + struct net *net = xp_net(xp); + struct xfrm_userpolicy_info *p; + struct xfrm_userpolicy_id *id; + struct nlmsghdr *nlh; + struct sk_buff *skb; + unsigned int headlen; + int err; + + headlen = sizeof(*p); + if (c->event == XFRM_MSG_DELPOLICY) { + len += nla_total_size(headlen); + headlen = sizeof(*id); + } + len += userpolicy_type_attrsize(); + len += nla_total_size(sizeof(struct xfrm_mark)); + len += NLMSG_ALIGN(headlen); + + skb = nlmsg_new(len, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + + p = nlmsg_data(nlh); + if (c->event == XFRM_MSG_DELPOLICY) { + struct nlattr *attr; + + id = nlmsg_data(nlh); + memset(id, 0, sizeof(*id)); + id->dir = dir; + if (c->data.byid) + id->index = xp->index; + else + memcpy(&id->sel, &xp->selector, sizeof(id->sel)); + + attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p)); + err = -EMSGSIZE; + if (attr == NULL) + goto out_free_skb; + + p = nla_data(attr); + } + + copy_to_user_policy(xp, p, dir); + err = copy_to_user_tmpl(xp, skb); + if (!err) + err = copy_to_user_policy_type(xp->type, skb); + if (!err) + err = xfrm_mark_put(skb, &xp->mark); + if (!err) + err = xfrm_if_id_put(skb, xp->if_id); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_notify_policy_flush(const struct km_event *c) +{ + struct net *net = c->net; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int err; + + skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0); + err = -EMSGSIZE; + if (nlh == NULL) + goto out_free_skb; + err = copy_to_user_policy_type(c->data.type, skb); + if (err) + goto out_free_skb; + + nlmsg_end(skb, nlh); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY); + +out_free_skb: + kfree_skb(skb); + return err; +} + +static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + + switch (c->event) { + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_UPDPOLICY: + case XFRM_MSG_DELPOLICY: + return xfrm_notify_policy(xp, dir, c); + case XFRM_MSG_FLUSHPOLICY: + return xfrm_notify_policy_flush(c); + case XFRM_MSG_POLEXPIRE: + return xfrm_exp_policy_notify(xp, dir, c); + default: + printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n", + c->event); + } + + return 0; + +} + +static inline unsigned int xfrm_report_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_report)); +} + +static int build_report(struct sk_buff *skb, u8 proto, + struct xfrm_selector *sel, xfrm_address_t *addr) +{ + struct xfrm_user_report *ur; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0); + if (nlh == NULL) + return -EMSGSIZE; + + ur = nlmsg_data(nlh); + ur->proto = proto; + memcpy(&ur->sel, sel, sizeof(ur->sel)); + + if (addr) { + int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr); + if (err) { + nlmsg_cancel(skb, nlh); + return err; + } + } + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_report(struct net *net, u8 proto, + struct xfrm_selector *sel, xfrm_address_t *addr) +{ + struct sk_buff *skb; + int err; + + skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + err = build_report(skb, proto, sel, addr); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT); +} + +static inline unsigned int xfrm_mapping_msgsize(void) +{ + return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping)); +} + +static int build_mapping(struct sk_buff *skb, struct xfrm_state *x, + xfrm_address_t *new_saddr, __be16 new_sport) +{ + struct xfrm_user_mapping *um; + struct nlmsghdr *nlh; + + nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0); + if (nlh == NULL) + return -EMSGSIZE; + + um = nlmsg_data(nlh); + + memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr)); + um->id.spi = x->id.spi; + um->id.family = x->props.family; + um->id.proto = x->id.proto; + memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr)); + memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr)); + um->new_sport = new_sport; + um->old_sport = x->encap->encap_sport; + um->reqid = x->props.reqid; + + nlmsg_end(skb, nlh); + return 0; +} + +static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, + __be16 sport) +{ + struct net *net = xs_net(x); + struct sk_buff *skb; + int err; + + if (x->id.proto != IPPROTO_ESP) + return -EINVAL; + + if (!x->encap) + return -EINVAL; + + skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + err = build_mapping(skb, x, ipaddr, sport); + BUG_ON(err < 0); + + return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING); +} + +static bool xfrm_is_alive(const struct km_event *c) +{ + return (bool)xfrm_acquire_is_on(c->net); +} + +static struct xfrm_mgr netlink_mgr = { + .notify = xfrm_send_state_notify, + .acquire = xfrm_send_acquire, + .compile_policy = xfrm_compile_policy, + .notify_policy = xfrm_send_policy_notify, + .report = xfrm_send_report, + .migrate = xfrm_send_migrate, + .new_mapping = xfrm_send_mapping, + .is_alive = xfrm_is_alive, +}; + +static int __net_init xfrm_user_net_init(struct net *net) +{ + struct sock *nlsk; + struct netlink_kernel_cfg cfg = { + .groups = XFRMNLGRP_MAX, + .input = xfrm_netlink_rcv, + }; + + nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg); + if (nlsk == NULL) + return -ENOMEM; + net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */ + rcu_assign_pointer(net->xfrm.nlsk, nlsk); + return 0; +} + +static void __net_exit xfrm_user_net_pre_exit(struct net *net) +{ + RCU_INIT_POINTER(net->xfrm.nlsk, NULL); +} + +static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list) +{ + struct net *net; + + list_for_each_entry(net, net_exit_list, exit_list) + netlink_kernel_release(net->xfrm.nlsk_stash); +} + +static struct pernet_operations xfrm_user_net_ops = { + .init = xfrm_user_net_init, + .pre_exit = xfrm_user_net_pre_exit, + .exit_batch = xfrm_user_net_exit, +}; + +static int __init xfrm_user_init(void) +{ + int rv; + + printk(KERN_INFO "Initializing XFRM netlink socket\n"); + + rv = register_pernet_subsys(&xfrm_user_net_ops); + if (rv < 0) + return rv; + xfrm_register_km(&netlink_mgr); + return 0; +} + +static void __exit xfrm_user_exit(void) +{ + xfrm_unregister_km(&netlink_mgr); + unregister_pernet_subsys(&xfrm_user_net_ops); +} + +module_init(xfrm_user_init); +module_exit(xfrm_user_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM); -- cgit v1.2.3