diff options
Diffstat (limited to 'net/ipv6/raw.c')
| -rw-r--r-- | net/ipv6/raw.c | 1356 |
1 files changed, 1356 insertions, 0 deletions
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c new file mode 100644 index 000000000..7ff06fa7e --- /dev/null +++ b/net/ipv6/raw.c @@ -0,0 +1,1356 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * RAW sockets for IPv6 + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * Adapted from linux/net/ipv4/raw.c + * + * Fixes: + * Hideaki YOSHIFUJI : sin6_scope_id support + * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) + * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data + */ + +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/slab.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/in6.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/icmpv6.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> +#include <linux/skbuff.h> +#include <linux/compat.h> +#include <linux/uaccess.h> +#include <asm/ioctls.h> + +#include <net/net_namespace.h> +#include <net/ip.h> +#include <net/sock.h> +#include <net/snmp.h> + +#include <net/ipv6.h> +#include <net/ndisc.h> +#include <net/protocol.h> +#include <net/ip6_route.h> +#include <net/ip6_checksum.h> +#include <net/addrconf.h> +#include <net/transp_v6.h> +#include <net/udp.h> +#include <net/inet_common.h> +#include <net/tcp_states.h> +#if IS_ENABLED(CONFIG_IPV6_MIP6) +#include <net/mip6.h> +#endif +#include <linux/mroute6.h> + +#include <net/raw.h> +#include <net/rawv6.h> +#include <net/xfrm.h> + +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/export.h> + +#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */ + +struct raw_hashinfo raw_v6_hashinfo = { + .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), +}; +EXPORT_SYMBOL_GPL(raw_v6_hashinfo); + +struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, + unsigned short num, const struct in6_addr *loc_addr, + const struct in6_addr *rmt_addr, int dif, int sdif) +{ + bool is_multicast = ipv6_addr_is_multicast(loc_addr); + + sk_for_each_from(sk) + if (inet_sk(sk)->inet_num == num) { + + if (!net_eq(sock_net(sk), net)) + continue; + + if (!ipv6_addr_any(&sk->sk_v6_daddr) && + !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) + continue; + + if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, + dif, sdif)) + continue; + + if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { + if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)) + goto found; + if (is_multicast && + inet6_mc_check(sk, loc_addr, rmt_addr)) + goto found; + continue; + } + goto found; + } + sk = NULL; +found: + return sk; +} +EXPORT_SYMBOL_GPL(__raw_v6_lookup); + +/* + * 0 - deliver + * 1 - block + */ +static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) +{ + struct icmp6hdr _hdr; + const struct icmp6hdr *hdr; + + /* We require only the four bytes of the ICMPv6 header, not any + * additional bytes of message body in "struct icmp6hdr". + */ + hdr = skb_header_pointer(skb, skb_transport_offset(skb), + ICMPV6_HDRLEN, &_hdr); + if (hdr) { + const __u32 *data = &raw6_sk(sk)->filter.data[0]; + unsigned int type = hdr->icmp6_type; + + return (data[type >> 5] & (1U << (type & 31))) != 0; + } + return 1; +} + +#if IS_ENABLED(CONFIG_IPV6_MIP6) +typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); + +static mh_filter_t __rcu *mh_filter __read_mostly; + +int rawv6_mh_filter_register(mh_filter_t filter) +{ + rcu_assign_pointer(mh_filter, filter); + return 0; +} +EXPORT_SYMBOL(rawv6_mh_filter_register); + +int rawv6_mh_filter_unregister(mh_filter_t filter) +{ + RCU_INIT_POINTER(mh_filter, NULL); + synchronize_rcu(); + return 0; +} +EXPORT_SYMBOL(rawv6_mh_filter_unregister); + +#endif + +/* + * demultiplex raw sockets. + * (should consider queueing the skb in the sock receive_queue + * without calling rawv6.c) + * + * Caller owns SKB so we must make clones. + */ +static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) +{ + const struct in6_addr *saddr; + const struct in6_addr *daddr; + struct sock *sk; + bool delivered = false; + __u8 hash; + struct net *net; + + saddr = &ipv6_hdr(skb)->saddr; + daddr = saddr + 1; + + hash = nexthdr & (RAW_HTABLE_SIZE - 1); + + read_lock(&raw_v6_hashinfo.lock); + sk = sk_head(&raw_v6_hashinfo.ht[hash]); + + if (!sk) + goto out; + + net = dev_net(skb->dev); + sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, + inet6_iif(skb), inet6_sdif(skb)); + + while (sk) { + int filtered; + + delivered = true; + switch (nexthdr) { + case IPPROTO_ICMPV6: + filtered = icmpv6_filter(sk, skb); + break; + +#if IS_ENABLED(CONFIG_IPV6_MIP6) + case IPPROTO_MH: + { + /* XXX: To validate MH only once for each packet, + * this is placed here. It should be after checking + * xfrm policy, however it doesn't. The checking xfrm + * policy is placed in rawv6_rcv() because it is + * required for each socket. + */ + mh_filter_t *filter; + + filter = rcu_dereference(mh_filter); + filtered = filter ? (*filter)(sk, skb) : 0; + break; + } +#endif + default: + filtered = 0; + break; + } + + if (filtered < 0) + break; + if (filtered == 0) { + struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); + + /* Not releasing hash table! */ + if (clone) { + nf_reset_ct(clone); + rawv6_rcv(sk, clone); + } + } + sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, + inet6_iif(skb), inet6_sdif(skb)); + } +out: + read_unlock(&raw_v6_hashinfo.lock); + return delivered; +} + +bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) +{ + struct sock *raw_sk; + + raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]); + if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) + raw_sk = NULL; + + return raw_sk != NULL; +} + +/* This cleans up af_inet6 a bit. -DaveM */ +static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) +{ + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; + __be32 v4addr = 0; + int addr_type; + int err; + + if (addr_len < SIN6_LEN_RFC2133) + return -EINVAL; + + if (addr->sin6_family != AF_INET6) + return -EINVAL; + + addr_type = ipv6_addr_type(&addr->sin6_addr); + + /* Raw sockets are IPv6 only */ + if (addr_type == IPV6_ADDR_MAPPED) + return -EADDRNOTAVAIL; + + lock_sock(sk); + + err = -EINVAL; + if (sk->sk_state != TCP_CLOSE) + goto out; + + rcu_read_lock(); + /* Check if the address belongs to the host. */ + if (addr_type != IPV6_ADDR_ANY) { + struct net_device *dev = NULL; + + if (__ipv6_addr_needs_scope_id(addr_type)) { + if (addr_len >= sizeof(struct sockaddr_in6) && + addr->sin6_scope_id) { + /* Override any existing binding, if another + * one is supplied by user. + */ + sk->sk_bound_dev_if = addr->sin6_scope_id; + } + + /* Binding to link-local address requires an interface */ + if (!sk->sk_bound_dev_if) + goto out_unlock; + } + + if (sk->sk_bound_dev_if) { + err = -ENODEV; + dev = dev_get_by_index_rcu(sock_net(sk), + sk->sk_bound_dev_if); + if (!dev) + goto out_unlock; + } + + /* ipv4 addr of the socket is invalid. Only the + * unspecified and mapped address have a v4 equivalent. + */ + v4addr = LOOPBACK4_IPV6; + if (!(addr_type & IPV6_ADDR_MULTICAST) && + !ipv6_can_nonlocal_bind(sock_net(sk), inet)) { + err = -EADDRNOTAVAIL; + if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, + dev, 0)) { + goto out_unlock; + } + } + } + + inet->inet_rcv_saddr = inet->inet_saddr = v4addr; + sk->sk_v6_rcv_saddr = addr->sin6_addr; + if (!(addr_type & IPV6_ADDR_MULTICAST)) + np->saddr = addr->sin6_addr; + err = 0; +out_unlock: + rcu_read_unlock(); +out: + release_sock(sk); + return err; +} + +static void rawv6_err(struct sock *sk, struct sk_buff *skb, + struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, __be32 info) +{ + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + int err; + int harderr; + + /* Report error on raw socket, if: + 1. User requested recverr. + 2. Socket is connected (otherwise the error indication + is useless without recverr and error is hard. + */ + if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) + return; + + harderr = icmpv6_err_convert(type, code, &err); + if (type == ICMPV6_PKT_TOOBIG) { + ip6_sk_update_pmtu(skb, sk, info); + harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); + } + if (type == NDISC_REDIRECT) { + ip6_sk_redirect(skb, sk); + return; + } + if (np->recverr) { + u8 *payload = skb->data; + if (!inet->hdrincl) + payload += offset; + ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); + } + + if (np->recverr || harderr) { + sk->sk_err = err; + sk->sk_error_report(sk); + } +} + +void raw6_icmp_error(struct sk_buff *skb, int nexthdr, + u8 type, u8 code, int inner_offset, __be32 info) +{ + struct sock *sk; + int hash; + const struct in6_addr *saddr, *daddr; + struct net *net; + + hash = nexthdr & (RAW_HTABLE_SIZE - 1); + + read_lock(&raw_v6_hashinfo.lock); + sk = sk_head(&raw_v6_hashinfo.ht[hash]); + if (sk) { + /* Note: ipv6_hdr(skb) != skb->data */ + const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; + saddr = &ip6h->saddr; + daddr = &ip6h->daddr; + net = dev_net(skb->dev); + + while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, + inet6_iif(skb), inet6_iif(skb)))) { + rawv6_err(sk, skb, NULL, type, code, + inner_offset, info); + sk = sk_next(sk); + } + } + read_unlock(&raw_v6_hashinfo.lock); +} + +static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) +{ + if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && + skb_checksum_complete(skb)) { + atomic_inc(&sk->sk_drops); + kfree_skb(skb); + return NET_RX_DROP; + } + + /* Charge it to the socket. */ + skb_dst_drop(skb); + if (sock_queue_rcv_skb(sk, skb) < 0) { + kfree_skb(skb); + return NET_RX_DROP; + } + + return 0; +} + +/* + * This is next to useless... + * if we demultiplex in network layer we don't need the extra call + * just to queue the skb... + * maybe we could have the network decide upon a hint if it + * should call raw_rcv for demultiplexing + */ +int rawv6_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct inet_sock *inet = inet_sk(sk); + struct raw6_sock *rp = raw6_sk(sk); + + if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { + atomic_inc(&sk->sk_drops); + kfree_skb(skb); + return NET_RX_DROP; + } + + if (!rp->checksum) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + if (skb->ip_summed == CHECKSUM_COMPLETE) { + skb_postpull_rcsum(skb, skb_network_header(skb), + skb_network_header_len(skb)); + if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, + &ipv6_hdr(skb)->daddr, + skb->len, inet->inet_num, skb->csum)) + skb->ip_summed = CHECKSUM_UNNECESSARY; + } + if (!skb_csum_unnecessary(skb)) + skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, + &ipv6_hdr(skb)->daddr, + skb->len, + inet->inet_num, 0)); + + if (inet->hdrincl) { + if (skb_checksum_complete(skb)) { + atomic_inc(&sk->sk_drops); + kfree_skb(skb); + return NET_RX_DROP; + } + } + + rawv6_rcv_skb(sk, skb); + return 0; +} + + +/* + * This should be easy, if there is something there + * we return it, otherwise we block. + */ + +static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int noblock, int flags, int *addr_len) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); + struct sk_buff *skb; + size_t copied; + int err; + + if (flags & MSG_OOB) + return -EOPNOTSUPP; + + if (flags & MSG_ERRQUEUE) + return ipv6_recv_error(sk, msg, len, addr_len); + + if (np->rxpmtu && np->rxopt.bits.rxpmtu) + return ipv6_recv_rxpmtu(sk, msg, len, addr_len); + + skb = skb_recv_datagram(sk, flags, noblock, &err); + if (!skb) + goto out; + + copied = skb->len; + if (copied > len) { + copied = len; + msg->msg_flags |= MSG_TRUNC; + } + + if (skb_csum_unnecessary(skb)) { + err = skb_copy_datagram_msg(skb, 0, msg, copied); + } else if (msg->msg_flags&MSG_TRUNC) { + if (__skb_checksum_complete(skb)) + goto csum_copy_err; + err = skb_copy_datagram_msg(skb, 0, msg, copied); + } else { + err = skb_copy_and_csum_datagram_msg(skb, 0, msg); + if (err == -EINVAL) + goto csum_copy_err; + } + if (err) + goto out_free; + + /* Copy the address. */ + if (sin6) { + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_addr = ipv6_hdr(skb)->saddr; + sin6->sin6_flowinfo = 0; + sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, + inet6_iif(skb)); + *addr_len = sizeof(*sin6); + } + + sock_recv_ts_and_drops(msg, sk, skb); + + if (np->rxopt.all) + ip6_datagram_recv_ctl(sk, msg, skb); + + err = copied; + if (flags & MSG_TRUNC) + err = skb->len; + +out_free: + skb_free_datagram(sk, skb); +out: + return err; + +csum_copy_err: + skb_kill_datagram(sk, skb, flags); + + /* Error for blocking case is chosen to masquerade + as some normal condition. + */ + err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; + goto out; +} + +static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, + struct raw6_sock *rp) +{ + struct ipv6_txoptions *opt; + struct sk_buff *skb; + int err = 0; + int offset; + int len; + int total_len; + __wsum tmp_csum; + __sum16 csum; + + if (!rp->checksum) + goto send; + + skb = skb_peek(&sk->sk_write_queue); + if (!skb) + goto out; + + offset = rp->offset; + total_len = inet_sk(sk)->cork.base.length; + opt = inet6_sk(sk)->cork.opt; + total_len -= opt ? opt->opt_flen : 0; + + if (offset >= total_len - 1) { + err = -EINVAL; + ip6_flush_pending_frames(sk); + goto out; + } + + /* should be check HW csum miyazawa */ + if (skb_queue_len(&sk->sk_write_queue) == 1) { + /* + * Only one fragment on the socket. + */ + tmp_csum = skb->csum; + } else { + struct sk_buff *csum_skb = NULL; + tmp_csum = 0; + + skb_queue_walk(&sk->sk_write_queue, skb) { + tmp_csum = csum_add(tmp_csum, skb->csum); + + if (csum_skb) + continue; + + len = skb->len - skb_transport_offset(skb); + if (offset >= len) { + offset -= len; + continue; + } + + csum_skb = skb; + } + + skb = csum_skb; + } + + offset += skb_transport_offset(skb); + err = skb_copy_bits(skb, offset, &csum, 2); + if (err < 0) { + ip6_flush_pending_frames(sk); + goto out; + } + + /* in case cksum was not initialized */ + if (unlikely(csum)) + tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); + + csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, + total_len, fl6->flowi6_proto, tmp_csum); + + if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) + csum = CSUM_MANGLED_0; + + BUG_ON(skb_store_bits(skb, offset, &csum, 2)); + +send: + err = ip6_push_pending_frames(sk); +out: + return err; +} + +static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, + struct flowi6 *fl6, struct dst_entry **dstp, + unsigned int flags, const struct sockcm_cookie *sockc) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct net *net = sock_net(sk); + struct ipv6hdr *iph; + struct sk_buff *skb; + int err; + struct rt6_info *rt = (struct rt6_info *)*dstp; + int hlen = LL_RESERVED_SPACE(rt->dst.dev); + int tlen = rt->dst.dev->needed_tailroom; + + if (length > rt->dst.dev->mtu) { + ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); + return -EMSGSIZE; + } + if (length < sizeof(struct ipv6hdr)) + return -EINVAL; + if (flags&MSG_PROBE) + goto out; + + skb = sock_alloc_send_skb(sk, + length + hlen + tlen + 15, + flags & MSG_DONTWAIT, &err); + if (!skb) + goto error; + skb_reserve(skb, hlen); + + skb->protocol = htons(ETH_P_IPV6); + skb->priority = sk->sk_priority; + skb->mark = sockc->mark; + skb->tstamp = sockc->transmit_time; + + skb_put(skb, length); + skb_reset_network_header(skb); + iph = ipv6_hdr(skb); + + skb->ip_summed = CHECKSUM_NONE; + + skb_setup_tx_timestamp(skb, sockc->tsflags); + + if (flags & MSG_CONFIRM) + skb_set_dst_pending_confirm(skb, 1); + + skb->transport_header = skb->network_header; + err = memcpy_from_msg(iph, msg, length); + if (err) { + err = -EFAULT; + kfree_skb(skb); + goto error; + } + + skb_dst_set(skb, &rt->dst); + *dstp = NULL; + + /* if egress device is enslaved to an L3 master device pass the + * skb to its handler for processing + */ + skb = l3mdev_ip6_out(sk, skb); + if (unlikely(!skb)) + return 0; + + /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev + * in the error path. Since skb has been freed, the dst could + * have been queued for deletion. + */ + rcu_read_lock(); + IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); + err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, + NULL, rt->dst.dev, dst_output); + if (err > 0) + err = net_xmit_errno(err); + if (err) { + IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); + rcu_read_unlock(); + goto error_check; + } + rcu_read_unlock(); +out: + return 0; + +error: + IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); +error_check: + if (err == -ENOBUFS && !np->recverr) + err = 0; + return err; +} + +struct raw6_frag_vec { + struct msghdr *msg; + int hlen; + char c[4]; +}; + +static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) +{ + int err = 0; + switch (fl6->flowi6_proto) { + case IPPROTO_ICMPV6: + rfv->hlen = 2; + err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); + if (!err) { + fl6->fl6_icmp_type = rfv->c[0]; + fl6->fl6_icmp_code = rfv->c[1]; + } + break; + case IPPROTO_MH: + rfv->hlen = 4; + err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); + if (!err) + fl6->fl6_mh_type = rfv->c[2]; + } + return err; +} + +static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, + struct sk_buff *skb) +{ + struct raw6_frag_vec *rfv = from; + + if (offset < rfv->hlen) { + int copy = min(rfv->hlen - offset, len); + + if (skb->ip_summed == CHECKSUM_PARTIAL) + memcpy(to, rfv->c + offset, copy); + else + skb->csum = csum_block_add( + skb->csum, + csum_partial_copy_nocheck(rfv->c + offset, + to, copy), + odd); + + odd = 0; + offset += copy; + to += copy; + len -= copy; + + if (!len) + return 0; + } + + offset -= rfv->hlen; + + return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); +} + +static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct ipv6_txoptions *opt_to_free = NULL; + struct ipv6_txoptions opt_space; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); + struct in6_addr *daddr, *final_p, final; + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct raw6_sock *rp = raw6_sk(sk); + struct ipv6_txoptions *opt = NULL; + struct ip6_flowlabel *flowlabel = NULL; + struct dst_entry *dst = NULL; + struct raw6_frag_vec rfv; + struct flowi6 fl6; + struct ipcm6_cookie ipc6; + int addr_len = msg->msg_namelen; + int hdrincl; + u16 proto; + int err; + + /* Rough check on arithmetic overflow, + better check is made in ip6_append_data(). + */ + if (len > INT_MAX) + return -EMSGSIZE; + + /* Mirror BSD error message compatibility */ + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + /* hdrincl should be READ_ONCE(inet->hdrincl) + * but READ_ONCE() doesn't work with bit fields. + * Doing this indirectly yields the same result. + */ + hdrincl = inet->hdrincl; + hdrincl = READ_ONCE(hdrincl); + + /* + * Get and verify the address. + */ + memset(&fl6, 0, sizeof(fl6)); + + fl6.flowi6_mark = sk->sk_mark; + fl6.flowi6_uid = sk->sk_uid; + + ipcm6_init(&ipc6); + ipc6.sockc.tsflags = sk->sk_tsflags; + ipc6.sockc.mark = sk->sk_mark; + + if (sin6) { + if (addr_len < SIN6_LEN_RFC2133) + return -EINVAL; + + if (sin6->sin6_family && sin6->sin6_family != AF_INET6) + return -EAFNOSUPPORT; + + /* port is the proto value [0..255] carried in nexthdr */ + proto = ntohs(sin6->sin6_port); + + if (!proto) + proto = inet->inet_num; + else if (proto != inet->inet_num && + inet->inet_num != IPPROTO_RAW) + return -EINVAL; + + if (proto > 255) + return -EINVAL; + + daddr = &sin6->sin6_addr; + if (np->sndflow) { + fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; + if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { + flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); + if (IS_ERR(flowlabel)) + return -EINVAL; + } + } + + /* + * Otherwise it will be difficult to maintain + * sk->sk_dst_cache. + */ + if (sk->sk_state == TCP_ESTABLISHED && + ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) + daddr = &sk->sk_v6_daddr; + + if (addr_len >= sizeof(struct sockaddr_in6) && + sin6->sin6_scope_id && + __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) + fl6.flowi6_oif = sin6->sin6_scope_id; + } else { + if (sk->sk_state != TCP_ESTABLISHED) + return -EDESTADDRREQ; + + proto = inet->inet_num; + daddr = &sk->sk_v6_daddr; + fl6.flowlabel = np->flow_label; + } + + if (fl6.flowi6_oif == 0) + fl6.flowi6_oif = sk->sk_bound_dev_if; + + if (msg->msg_controllen) { + opt = &opt_space; + memset(opt, 0, sizeof(struct ipv6_txoptions)); + opt->tot_len = sizeof(struct ipv6_txoptions); + ipc6.opt = opt; + + err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); + if (err < 0) { + fl6_sock_release(flowlabel); + return err; + } + if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { + flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); + if (IS_ERR(flowlabel)) + return -EINVAL; + } + if (!(opt->opt_nflen|opt->opt_flen)) + opt = NULL; + } + if (!opt) { + opt = txopt_get(np); + opt_to_free = opt; + } + if (flowlabel) + opt = fl6_merge_options(&opt_space, flowlabel, opt); + opt = ipv6_fixup_options(&opt_space, opt); + + fl6.flowi6_proto = proto; + fl6.flowi6_mark = ipc6.sockc.mark; + + if (!hdrincl) { + rfv.msg = msg; + rfv.hlen = 0; + err = rawv6_probe_proto_opt(&rfv, &fl6); + if (err) + goto out; + } + + if (!ipv6_addr_any(daddr)) + fl6.daddr = *daddr; + else + fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ + if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) + fl6.saddr = np->saddr; + + final_p = fl6_update_dst(&fl6, opt, &final); + + if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) + fl6.flowi6_oif = np->mcast_oif; + else if (!fl6.flowi6_oif) + fl6.flowi6_oif = np->ucast_oif; + security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); + + if (hdrincl) + fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; + + if (ipc6.tclass < 0) + ipc6.tclass = np->tclass; + + fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); + + dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + goto out; + } + if (ipc6.hlimit < 0) + ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); + + if (ipc6.dontfrag < 0) + ipc6.dontfrag = np->dontfrag; + + if (msg->msg_flags&MSG_CONFIRM) + goto do_confirm; + +back_from_confirm: + if (hdrincl) + err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, + msg->msg_flags, &ipc6.sockc); + else { + ipc6.opt = opt; + lock_sock(sk); + err = ip6_append_data(sk, raw6_getfrag, &rfv, + len, 0, &ipc6, &fl6, (struct rt6_info *)dst, + msg->msg_flags); + + if (err) + ip6_flush_pending_frames(sk); + else if (!(msg->msg_flags & MSG_MORE)) + err = rawv6_push_pending_frames(sk, &fl6, rp); + release_sock(sk); + } +done: + dst_release(dst); +out: + fl6_sock_release(flowlabel); + txopt_put(opt_to_free); + return err < 0 ? err : len; +do_confirm: + if (msg->msg_flags & MSG_PROBE) + dst_confirm_neigh(dst, &fl6.daddr); + if (!(msg->msg_flags & MSG_PROBE) || len) + goto back_from_confirm; + err = 0; + goto done; +} + +static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, + sockptr_t optval, int optlen) +{ + switch (optname) { + case ICMPV6_FILTER: + if (optlen > sizeof(struct icmp6_filter)) + optlen = sizeof(struct icmp6_filter); + if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen)) + return -EFAULT; + return 0; + default: + return -ENOPROTOOPT; + } + + return 0; +} + +static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + int len; + + switch (optname) { + case ICMPV6_FILTER: + if (get_user(len, optlen)) + return -EFAULT; + if (len < 0) + return -EINVAL; + if (len > sizeof(struct icmp6_filter)) + len = sizeof(struct icmp6_filter); + if (put_user(len, optlen)) + return -EFAULT; + if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) + return -EFAULT; + return 0; + default: + return -ENOPROTOOPT; + } + + return 0; +} + + +static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + struct raw6_sock *rp = raw6_sk(sk); + int val; + + if (optlen < sizeof(val)) + return -EINVAL; + + if (copy_from_sockptr(&val, optval, sizeof(val))) + return -EFAULT; + + switch (optname) { + case IPV6_HDRINCL: + if (sk->sk_type != SOCK_RAW) + return -EINVAL; + inet_sk(sk)->hdrincl = !!val; + return 0; + case IPV6_CHECKSUM: + if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && + level == IPPROTO_IPV6) { + /* + * RFC3542 tells that IPV6_CHECKSUM socket + * option in the IPPROTO_IPV6 level is not + * allowed on ICMPv6 sockets. + * If you want to set it, use IPPROTO_RAW + * level IPV6_CHECKSUM socket option + * (Linux extension). + */ + return -EINVAL; + } + + /* You may get strange result with a positive odd offset; + RFC2292bis agrees with me. */ + if (val > 0 && (val&1)) + return -EINVAL; + if (val < 0) { + rp->checksum = 0; + } else { + rp->checksum = 1; + rp->offset = val; + } + + return 0; + + default: + return -ENOPROTOOPT; + } +} + +static int rawv6_setsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, unsigned int optlen) +{ + switch (level) { + case SOL_RAW: + break; + + case SOL_ICMPV6: + if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) + return -EOPNOTSUPP; + return rawv6_seticmpfilter(sk, level, optname, optval, optlen); + case SOL_IPV6: + if (optname == IPV6_CHECKSUM || + optname == IPV6_HDRINCL) + break; + fallthrough; + default: + return ipv6_setsockopt(sk, level, optname, optval, optlen); + } + + return do_rawv6_setsockopt(sk, level, optname, optval, optlen); +} + +static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + struct raw6_sock *rp = raw6_sk(sk); + int val, len; + + if (get_user(len, optlen)) + return -EFAULT; + + switch (optname) { + case IPV6_HDRINCL: + val = inet_sk(sk)->hdrincl; + break; + case IPV6_CHECKSUM: + /* + * We allow getsockopt() for IPPROTO_IPV6-level + * IPV6_CHECKSUM socket option on ICMPv6 sockets + * since RFC3542 is silent about it. + */ + if (rp->checksum == 0) + val = -1; + else + val = rp->offset; + break; + + default: + return -ENOPROTOOPT; + } + + len = min_t(unsigned int, sizeof(int), len); + + if (put_user(len, optlen)) + return -EFAULT; + if (copy_to_user(optval, &val, len)) + return -EFAULT; + return 0; +} + +static int rawv6_getsockopt(struct sock *sk, int level, int optname, + char __user *optval, int __user *optlen) +{ + switch (level) { + case SOL_RAW: + break; + + case SOL_ICMPV6: + if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) + return -EOPNOTSUPP; + return rawv6_geticmpfilter(sk, level, optname, optval, optlen); + case SOL_IPV6: + if (optname == IPV6_CHECKSUM || + optname == IPV6_HDRINCL) + break; + fallthrough; + default: + return ipv6_getsockopt(sk, level, optname, optval, optlen); + } + + return do_rawv6_getsockopt(sk, level, optname, optval, optlen); +} + +static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) +{ + switch (cmd) { + case SIOCOUTQ: { + int amount = sk_wmem_alloc_get(sk); + + return put_user(amount, (int __user *)arg); + } + case SIOCINQ: { + struct sk_buff *skb; + int amount = 0; + + spin_lock_bh(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + if (skb) + amount = skb->len; + spin_unlock_bh(&sk->sk_receive_queue.lock); + return put_user(amount, (int __user *)arg); + } + + default: +#ifdef CONFIG_IPV6_MROUTE + return ip6mr_ioctl(sk, cmd, (void __user *)arg); +#else + return -ENOIOCTLCMD; +#endif + } +} + +#ifdef CONFIG_COMPAT +static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case SIOCOUTQ: + case SIOCINQ: + return -ENOIOCTLCMD; + default: +#ifdef CONFIG_IPV6_MROUTE + return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); +#else + return -ENOIOCTLCMD; +#endif + } +} +#endif + +static void rawv6_close(struct sock *sk, long timeout) +{ + if (inet_sk(sk)->inet_num == IPPROTO_RAW) + ip6_ra_control(sk, -1); + ip6mr_sk_done(sk); + sk_common_release(sk); +} + +static void raw6_destroy(struct sock *sk) +{ + lock_sock(sk); + ip6_flush_pending_frames(sk); + release_sock(sk); +} + +static int rawv6_init_sk(struct sock *sk) +{ + struct raw6_sock *rp = raw6_sk(sk); + + switch (inet_sk(sk)->inet_num) { + case IPPROTO_ICMPV6: + rp->checksum = 1; + rp->offset = 2; + break; + case IPPROTO_MH: + rp->checksum = 1; + rp->offset = 4; + break; + default: + break; + } + return 0; +} + +struct proto rawv6_prot = { + .name = "RAWv6", + .owner = THIS_MODULE, + .close = rawv6_close, + .destroy = raw6_destroy, + .connect = ip6_datagram_connect_v6_only, + .disconnect = __udp_disconnect, + .ioctl = rawv6_ioctl, + .init = rawv6_init_sk, + .setsockopt = rawv6_setsockopt, + .getsockopt = rawv6_getsockopt, + .sendmsg = rawv6_sendmsg, + .recvmsg = rawv6_recvmsg, + .bind = rawv6_bind, + .backlog_rcv = rawv6_rcv_skb, + .hash = raw_hash_sk, + .unhash = raw_unhash_sk, + .obj_size = sizeof(struct raw6_sock), + .useroffset = offsetof(struct raw6_sock, filter), + .usersize = sizeof_field(struct raw6_sock, filter), + .h.raw_hash = &raw_v6_hashinfo, +#ifdef CONFIG_COMPAT + .compat_ioctl = compat_rawv6_ioctl, +#endif + .diag_destroy = raw_abort, +}; + +#ifdef CONFIG_PROC_FS +static int raw6_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) { + seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); + } else { + struct sock *sp = v; + __u16 srcp = inet_sk(sp)->inet_num; + ip6_dgram_sock_seq_show(seq, v, srcp, 0, + raw_seq_private(seq)->bucket); + } + return 0; +} + +static const struct seq_operations raw6_seq_ops = { + .start = raw_seq_start, + .next = raw_seq_next, + .stop = raw_seq_stop, + .show = raw6_seq_show, +}; + +static int __net_init raw6_init_net(struct net *net) +{ + if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, + sizeof(struct raw_iter_state), &raw_v6_hashinfo)) + return -ENOMEM; + + return 0; +} + +static void __net_exit raw6_exit_net(struct net *net) +{ + remove_proc_entry("raw6", net->proc_net); +} + +static struct pernet_operations raw6_net_ops = { + .init = raw6_init_net, + .exit = raw6_exit_net, +}; + +int __init raw6_proc_init(void) +{ + return register_pernet_subsys(&raw6_net_ops); +} + +void raw6_proc_exit(void) +{ + unregister_pernet_subsys(&raw6_net_ops); +} +#endif /* CONFIG_PROC_FS */ + +/* Same as inet6_dgram_ops, sans udp_poll. */ +const struct proto_ops inet6_sockraw_ops = { + .family = PF_INET6, + .owner = THIS_MODULE, + .release = inet6_release, + .bind = inet6_bind, + .connect = inet_dgram_connect, /* ok */ + .socketpair = sock_no_socketpair, /* a do nothing */ + .accept = sock_no_accept, /* a do nothing */ + .getname = inet6_getname, + .poll = datagram_poll, /* ok */ + .ioctl = inet6_ioctl, /* must change */ + .gettstamp = sock_gettstamp, + .listen = sock_no_listen, /* ok */ + .shutdown = inet_shutdown, /* ok */ + .setsockopt = sock_common_setsockopt, /* ok */ + .getsockopt = sock_common_getsockopt, /* ok */ + .sendmsg = inet_sendmsg, /* ok */ + .recvmsg = sock_common_recvmsg, /* ok */ + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, +#ifdef CONFIG_COMPAT + .compat_ioctl = inet6_compat_ioctl, +#endif +}; + +static struct inet_protosw rawv6_protosw = { + .type = SOCK_RAW, + .protocol = IPPROTO_IP, /* wild card */ + .prot = &rawv6_prot, + .ops = &inet6_sockraw_ops, + .flags = INET_PROTOSW_REUSE, +}; + +int __init rawv6_init(void) +{ + return inet6_register_protosw(&rawv6_protosw); +} + +void rawv6_exit(void) +{ + inet6_unregister_protosw(&rawv6_protosw); +} |