diff options
Diffstat (limited to '')
| -rw-r--r-- | net/key/af_key.c | 3938 |
1 files changed, 3938 insertions, 0 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c new file mode 100644 index 000000000..f42854973 --- /dev/null +++ b/net/key/af_key.c @@ -0,0 +1,3938 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/key/af_key.c An implementation of PF_KEYv2 sockets. + * + * Authors: Maxim Giryaev <gem@asplinux.ru> + * David S. Miller <davem@redhat.com> + * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> + * Kunihiro Ishiguro <kunihiro@ipinfusion.com> + * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> + * Derek Atkins <derek@ihtfp.com> + */ + +#include <linux/capability.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/socket.h> +#include <linux/pfkeyv2.h> +#include <linux/ipsec.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/proc_fs.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/xfrm.h> + +#include <net/sock.h> + +#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) +#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) + +static unsigned int pfkey_net_id __read_mostly; +struct netns_pfkey { + /* List of all pfkey sockets. */ + struct hlist_head table; + atomic_t socks_nr; +}; +static DEFINE_MUTEX(pfkey_mutex); + +#define DUMMY_MARK 0 +static const struct xfrm_mark dummy_mark = {0, 0}; +struct pfkey_sock { + /* struct sock must be the first member of struct pfkey_sock */ + struct sock sk; + int registered; + int promisc; + + struct { + uint8_t msg_version; + uint32_t msg_portid; + int (*dump)(struct pfkey_sock *sk); + void (*done)(struct pfkey_sock *sk); + union { + struct xfrm_policy_walk policy; + struct xfrm_state_walk state; + } u; + struct sk_buff *skb; + } dump; + struct mutex dump_lock; +}; + +static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, + xfrm_address_t *saddr, xfrm_address_t *daddr, + u16 *family); + +static inline struct pfkey_sock *pfkey_sk(struct sock *sk) +{ + return (struct pfkey_sock *)sk; +} + +static int pfkey_can_dump(const struct sock *sk) +{ + if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) + return 1; + return 0; +} + +static void pfkey_terminate_dump(struct pfkey_sock *pfk) +{ + if (pfk->dump.dump) { + if (pfk->dump.skb) { + kfree_skb(pfk->dump.skb); + pfk->dump.skb = NULL; + } + pfk->dump.done(pfk); + pfk->dump.dump = NULL; + pfk->dump.done = NULL; + } +} + +static void pfkey_sock_destruct(struct sock *sk) +{ + struct net *net = sock_net(sk); + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + pfkey_terminate_dump(pfkey_sk(sk)); + skb_queue_purge(&sk->sk_receive_queue); + + if (!sock_flag(sk, SOCK_DEAD)) { + pr_err("Attempt to release alive pfkey socket: %p\n", sk); + return; + } + + WARN_ON(atomic_read(&sk->sk_rmem_alloc)); + WARN_ON(refcount_read(&sk->sk_wmem_alloc)); + + atomic_dec(&net_pfkey->socks_nr); +} + +static const struct proto_ops pfkey_ops; + +static void pfkey_insert(struct sock *sk) +{ + struct net *net = sock_net(sk); + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + mutex_lock(&pfkey_mutex); + sk_add_node_rcu(sk, &net_pfkey->table); + mutex_unlock(&pfkey_mutex); +} + +static void pfkey_remove(struct sock *sk) +{ + mutex_lock(&pfkey_mutex); + sk_del_node_init_rcu(sk); + mutex_unlock(&pfkey_mutex); +} + +static struct proto key_proto = { + .name = "KEY", + .owner = THIS_MODULE, + .obj_size = sizeof(struct pfkey_sock), +}; + +static int pfkey_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + struct sock *sk; + struct pfkey_sock *pfk; + int err; + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + if (sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + if (protocol != PF_KEY_V2) + return -EPROTONOSUPPORT; + + err = -ENOMEM; + sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); + if (sk == NULL) + goto out; + + pfk = pfkey_sk(sk); + mutex_init(&pfk->dump_lock); + + sock->ops = &pfkey_ops; + sock_init_data(sock, sk); + + sk->sk_family = PF_KEY; + sk->sk_destruct = pfkey_sock_destruct; + + atomic_inc(&net_pfkey->socks_nr); + + pfkey_insert(sk); + + return 0; +out: + return err; +} + +static int pfkey_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + + if (!sk) + return 0; + + pfkey_remove(sk); + + sock_orphan(sk); + sock->sk = NULL; + skb_queue_purge(&sk->sk_write_queue); + + synchronize_rcu(); + sock_put(sk); + + return 0; +} + +static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, + struct sock *sk) +{ + int err = -ENOBUFS; + + if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) + return err; + + skb = skb_clone(skb, allocation); + + if (skb) { + skb_set_owner_r(skb, sk); + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_data_ready(sk); + err = 0; + } + return err; +} + +/* Send SKB to all pfkey sockets matching selected criteria. */ +#define BROADCAST_ALL 0 +#define BROADCAST_ONE 1 +#define BROADCAST_REGISTERED 2 +#define BROADCAST_PROMISC_ONLY 4 +static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, + int broadcast_flags, struct sock *one_sk, + struct net *net) +{ + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + struct sock *sk; + int err = -ESRCH; + + /* XXX Do we need something like netlink_overrun? I think + * XXX PF_KEY socket apps will not mind current behavior. + */ + if (!skb) + return -ENOMEM; + + rcu_read_lock(); + sk_for_each_rcu(sk, &net_pfkey->table) { + struct pfkey_sock *pfk = pfkey_sk(sk); + int err2; + + /* Yes, it means that if you are meant to receive this + * pfkey message you receive it twice as promiscuous + * socket. + */ + if (pfk->promisc) + pfkey_broadcast_one(skb, GFP_ATOMIC, sk); + + /* the exact target will be processed later */ + if (sk == one_sk) + continue; + if (broadcast_flags != BROADCAST_ALL) { + if (broadcast_flags & BROADCAST_PROMISC_ONLY) + continue; + if ((broadcast_flags & BROADCAST_REGISTERED) && + !pfk->registered) + continue; + if (broadcast_flags & BROADCAST_ONE) + continue; + } + + err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); + + /* Error is cleared after successful sending to at least one + * registered KM */ + if ((broadcast_flags & BROADCAST_REGISTERED) && err) + err = err2; + } + rcu_read_unlock(); + + if (one_sk != NULL) + err = pfkey_broadcast_one(skb, allocation, one_sk); + + kfree_skb(skb); + return err; +} + +static int pfkey_do_dump(struct pfkey_sock *pfk) +{ + struct sadb_msg *hdr; + int rc; + + mutex_lock(&pfk->dump_lock); + if (!pfk->dump.dump) { + rc = 0; + goto out; + } + + rc = pfk->dump.dump(pfk); + if (rc == -ENOBUFS) { + rc = 0; + goto out; + } + + if (pfk->dump.skb) { + if (!pfkey_can_dump(&pfk->sk)) { + rc = 0; + goto out; + } + + hdr = (struct sadb_msg *) pfk->dump.skb->data; + hdr->sadb_msg_seq = 0; + hdr->sadb_msg_errno = rc; + pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, + &pfk->sk, sock_net(&pfk->sk)); + pfk->dump.skb = NULL; + } + + pfkey_terminate_dump(pfk); + +out: + mutex_unlock(&pfk->dump_lock); + return rc; +} + +static inline void pfkey_hdr_dup(struct sadb_msg *new, + const struct sadb_msg *orig) +{ + *new = *orig; +} + +static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) +{ + struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); + struct sadb_msg *hdr; + + if (!skb) + return -ENOBUFS; + + /* Woe be to the platform trying to support PFKEY yet + * having normal errnos outside the 1-255 range, inclusive. + */ + err = -err; + if (err == ERESTARTSYS || + err == ERESTARTNOHAND || + err == ERESTARTNOINTR) + err = EINTR; + if (err >= 512) + err = EINVAL; + BUG_ON(err <= 0 || err >= 256); + + hdr = skb_put(skb, sizeof(struct sadb_msg)); + pfkey_hdr_dup(hdr, orig); + hdr->sadb_msg_errno = (uint8_t) err; + hdr->sadb_msg_len = (sizeof(struct sadb_msg) / + sizeof(uint64_t)); + + pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); + + return 0; +} + +static const u8 sadb_ext_min_len[] = { + [SADB_EXT_RESERVED] = (u8) 0, + [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), + [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), + [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), + [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), + [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), + [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), + [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), + [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), + [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), + [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), + [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), + [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), + [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), + [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), + [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), + [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), + [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), + [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), + [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), + [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), + [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), + [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), + [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), +}; + +/* Verify sadb_address_{len,prefixlen} against sa_family. */ +static int verify_address_len(const void *p) +{ + const struct sadb_address *sp = p; + const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); + const struct sockaddr_in *sin; +#if IS_ENABLED(CONFIG_IPV6) + const struct sockaddr_in6 *sin6; +#endif + int len; + + if (sp->sadb_address_len < + DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), + sizeof(uint64_t))) + return -EINVAL; + + switch (addr->sa_family) { + case AF_INET: + len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); + if (sp->sadb_address_len != len || + sp->sadb_address_prefixlen > 32) + return -EINVAL; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); + if (sp->sadb_address_len != len || + sp->sadb_address_prefixlen > 128) + return -EINVAL; + break; +#endif + default: + /* It is user using kernel to keep track of security + * associations for another protocol, such as + * OSPF/RSVP/RIPV2/MIP. It is user's job to verify + * lengths. + * + * XXX Actually, association/policy database is not yet + * XXX able to cope with arbitrary sockaddr families. + * XXX When it can, remove this -EINVAL. -DaveM + */ + return -EINVAL; + } + + return 0; +} + +static inline int sadb_key_len(const struct sadb_key *key) +{ + int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); + + return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, + sizeof(uint64_t)); +} + +static int verify_key_len(const void *p) +{ + const struct sadb_key *key = p; + + if (sadb_key_len(key) > key->sadb_key_len) + return -EINVAL; + + return 0; +} + +static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) +{ + return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + + sec_ctx->sadb_x_ctx_len, + sizeof(uint64_t)); +} + +static inline int verify_sec_ctx_len(const void *p) +{ + const struct sadb_x_sec_ctx *sec_ctx = p; + int len = sec_ctx->sadb_x_ctx_len; + + if (len > PAGE_SIZE) + return -EINVAL; + + len = pfkey_sec_ctx_len(sec_ctx); + + if (sec_ctx->sadb_x_sec_len != len) + return -EINVAL; + + return 0; +} + +static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, + gfp_t gfp) +{ + struct xfrm_user_sec_ctx *uctx = NULL; + int ctx_size = sec_ctx->sadb_x_ctx_len; + + uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); + + if (!uctx) + return NULL; + + uctx->len = pfkey_sec_ctx_len(sec_ctx); + uctx->exttype = sec_ctx->sadb_x_sec_exttype; + uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; + uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; + uctx->ctx_len = sec_ctx->sadb_x_ctx_len; + memcpy(uctx + 1, sec_ctx + 1, + uctx->ctx_len); + + return uctx; +} + +static int present_and_same_family(const struct sadb_address *src, + const struct sadb_address *dst) +{ + const struct sockaddr *s_addr, *d_addr; + + if (!src || !dst) + return 0; + + s_addr = (const struct sockaddr *)(src + 1); + d_addr = (const struct sockaddr *)(dst + 1); + if (s_addr->sa_family != d_addr->sa_family) + return 0; + if (s_addr->sa_family != AF_INET +#if IS_ENABLED(CONFIG_IPV6) + && s_addr->sa_family != AF_INET6 +#endif + ) + return 0; + + return 1; +} + +static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) +{ + const char *p = (char *) hdr; + int len = skb->len; + + len -= sizeof(*hdr); + p += sizeof(*hdr); + while (len > 0) { + const struct sadb_ext *ehdr = (const struct sadb_ext *) p; + uint16_t ext_type; + int ext_len; + + if (len < sizeof(*ehdr)) + return -EINVAL; + + ext_len = ehdr->sadb_ext_len; + ext_len *= sizeof(uint64_t); + ext_type = ehdr->sadb_ext_type; + if (ext_len < sizeof(uint64_t) || + ext_len > len || + ext_type == SADB_EXT_RESERVED) + return -EINVAL; + + if (ext_type <= SADB_EXT_MAX) { + int min = (int) sadb_ext_min_len[ext_type]; + if (ext_len < min) + return -EINVAL; + if (ext_hdrs[ext_type-1] != NULL) + return -EINVAL; + switch (ext_type) { + case SADB_EXT_ADDRESS_SRC: + case SADB_EXT_ADDRESS_DST: + case SADB_EXT_ADDRESS_PROXY: + case SADB_X_EXT_NAT_T_OA: + if (verify_address_len(p)) + return -EINVAL; + break; + case SADB_X_EXT_SEC_CTX: + if (verify_sec_ctx_len(p)) + return -EINVAL; + break; + case SADB_EXT_KEY_AUTH: + case SADB_EXT_KEY_ENCRYPT: + if (verify_key_len(p)) + return -EINVAL; + break; + default: + break; + } + ext_hdrs[ext_type-1] = (void *) p; + } + p += ext_len; + len -= ext_len; + } + + return 0; +} + +static uint16_t +pfkey_satype2proto(uint8_t satype) +{ + switch (satype) { + case SADB_SATYPE_UNSPEC: + return IPSEC_PROTO_ANY; + case SADB_SATYPE_AH: + return IPPROTO_AH; + case SADB_SATYPE_ESP: + return IPPROTO_ESP; + case SADB_X_SATYPE_IPCOMP: + return IPPROTO_COMP; + default: + return 0; + } + /* NOTREACHED */ +} + +static uint8_t +pfkey_proto2satype(uint16_t proto) +{ + switch (proto) { + case IPPROTO_AH: + return SADB_SATYPE_AH; + case IPPROTO_ESP: + return SADB_SATYPE_ESP; + case IPPROTO_COMP: + return SADB_X_SATYPE_IPCOMP; + default: + return 0; + } + /* NOTREACHED */ +} + +/* BTW, this scheme means that there is no way with PFKEY2 sockets to + * say specifically 'just raw sockets' as we encode them as 255. + */ + +static uint8_t pfkey_proto_to_xfrm(uint8_t proto) +{ + return proto == IPSEC_PROTO_ANY ? 0 : proto; +} + +static uint8_t pfkey_proto_from_xfrm(uint8_t proto) +{ + return proto ? proto : IPSEC_PROTO_ANY; +} + +static inline int pfkey_sockaddr_len(sa_family_t family) +{ + switch (family) { + case AF_INET: + return sizeof(struct sockaddr_in); +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + return sizeof(struct sockaddr_in6); +#endif + } + return 0; +} + +static +int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) +{ + switch (sa->sa_family) { + case AF_INET: + xaddr->a4 = + ((struct sockaddr_in *)sa)->sin_addr.s_addr; + return AF_INET; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + memcpy(xaddr->a6, + &((struct sockaddr_in6 *)sa)->sin6_addr, + sizeof(struct in6_addr)); + return AF_INET6; +#endif + } + return 0; +} + +static +int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) +{ + return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), + xaddr); +} + +static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + const struct sadb_sa *sa; + const struct sadb_address *addr; + uint16_t proto; + unsigned short family; + xfrm_address_t *xaddr; + + sa = ext_hdrs[SADB_EXT_SA - 1]; + if (sa == NULL) + return NULL; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return NULL; + + /* sadb_address_len should be checked by caller */ + addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; + if (addr == NULL) + return NULL; + + family = ((const struct sockaddr *)(addr + 1))->sa_family; + switch (family) { + case AF_INET: + xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; + break; +#endif + default: + xaddr = NULL; + } + + if (!xaddr) + return NULL; + + return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); +} + +#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) + +static int +pfkey_sockaddr_size(sa_family_t family) +{ + return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); +} + +static inline int pfkey_mode_from_xfrm(int mode) +{ + switch(mode) { + case XFRM_MODE_TRANSPORT: + return IPSEC_MODE_TRANSPORT; + case XFRM_MODE_TUNNEL: + return IPSEC_MODE_TUNNEL; + case XFRM_MODE_BEET: + return IPSEC_MODE_BEET; + default: + return -1; + } +} + +static inline int pfkey_mode_to_xfrm(int mode) +{ + switch(mode) { + case IPSEC_MODE_ANY: /*XXX*/ + case IPSEC_MODE_TRANSPORT: + return XFRM_MODE_TRANSPORT; + case IPSEC_MODE_TUNNEL: + return XFRM_MODE_TUNNEL; + case IPSEC_MODE_BEET: + return XFRM_MODE_BEET; + default: + return -1; + } +} + +static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, + struct sockaddr *sa, + unsigned short family) +{ + switch (family) { + case AF_INET: + { + struct sockaddr_in *sin = (struct sockaddr_in *)sa; + sin->sin_family = AF_INET; + sin->sin_port = port; + sin->sin_addr.s_addr = xaddr->a4; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + return 32; + } +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + { + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; + sin6->sin6_family = AF_INET6; + sin6->sin6_port = port; + sin6->sin6_flowinfo = 0; + sin6->sin6_addr = xaddr->in6; + sin6->sin6_scope_id = 0; + return 128; + } +#endif + } + return 0; +} + +static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, + int add_keys, int hsc) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_sa *sa; + struct sadb_lifetime *lifetime; + struct sadb_address *addr; + struct sadb_key *key; + struct sadb_x_sa2 *sa2; + struct sadb_x_sec_ctx *sec_ctx; + struct xfrm_sec_ctx *xfrm_ctx; + int ctx_size = 0; + int size; + int auth_key_size = 0; + int encrypt_key_size = 0; + int sockaddr_size; + struct xfrm_encap_tmpl *natt = NULL; + int mode; + + /* address family check */ + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return ERR_PTR(-EINVAL); + + /* base, SA, (lifetime (HSC),) address(SD), (address(P),) + key(AE), (identity(SD),) (sensitivity)> */ + size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + + sizeof(struct sadb_lifetime) + + ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + + ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + + sizeof(struct sadb_address)*2 + + sockaddr_size*2 + + sizeof(struct sadb_x_sa2); + + if ((xfrm_ctx = x->security)) { + ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); + size += sizeof(struct sadb_x_sec_ctx) + ctx_size; + } + + /* identity & sensitivity */ + if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) + size += sizeof(struct sadb_address) + sockaddr_size; + + if (add_keys) { + if (x->aalg && x->aalg->alg_key_len) { + auth_key_size = + PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); + size += sizeof(struct sadb_key) + auth_key_size; + } + if (x->ealg && x->ealg->alg_key_len) { + encrypt_key_size = + PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); + size += sizeof(struct sadb_key) + encrypt_key_size; + } + } + if (x->encap) + natt = x->encap; + + if (natt && natt->encap_type) { + size += sizeof(struct sadb_x_nat_t_type); + size += sizeof(struct sadb_x_nat_t_port); + size += sizeof(struct sadb_x_nat_t_port); + } + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return ERR_PTR(-ENOBUFS); + + /* call should fill header later */ + hdr = skb_put(skb, sizeof(struct sadb_msg)); + memset(hdr, 0, size); /* XXX do we need this ? */ + hdr->sadb_msg_len = size / sizeof(uint64_t); + + /* sa */ + sa = skb_put(skb, sizeof(struct sadb_sa)); + sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_spi = x->id.spi; + sa->sadb_sa_replay = x->props.replay_window; + switch (x->km.state) { + case XFRM_STATE_VALID: + sa->sadb_sa_state = x->km.dying ? + SADB_SASTATE_DYING : SADB_SASTATE_MATURE; + break; + case XFRM_STATE_ACQ: + sa->sadb_sa_state = SADB_SASTATE_LARVAL; + break; + default: + sa->sadb_sa_state = SADB_SASTATE_DEAD; + break; + } + sa->sadb_sa_auth = 0; + if (x->aalg) { + struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); + sa->sadb_sa_auth = (a && a->pfkey_supported) ? + a->desc.sadb_alg_id : 0; + } + sa->sadb_sa_encrypt = 0; + BUG_ON(x->ealg && x->calg); + if (x->ealg) { + struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); + sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? + a->desc.sadb_alg_id : 0; + } + /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ + if (x->calg) { + struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); + sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? + a->desc.sadb_alg_id : 0; + } + + sa->sadb_sa_flags = 0; + if (x->props.flags & XFRM_STATE_NOECN) + sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; + if (x->props.flags & XFRM_STATE_DECAP_DSCP) + sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; + if (x->props.flags & XFRM_STATE_NOPMTUDISC) + sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; + + /* hard time */ + if (hsc & 2) { + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); + lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; + lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; + } + /* soft time */ + if (hsc & 1) { + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; + lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); + lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; + lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; + } + /* current time */ + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; + lifetime->sadb_lifetime_allocations = x->curlft.packets; + lifetime->sadb_lifetime_bytes = x->curlft.bytes; + lifetime->sadb_lifetime_addtime = x->curlft.add_time; + lifetime->sadb_lifetime_usetime = x->curlft.use_time; + /* src address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + /* "if the ports are non-zero, then the sadb_address_proto field, + normally zero, MUST be filled in with the transport + protocol's number." - RFC2367 */ + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(&x->props.saddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + BUG_ON(!addr->sadb_address_prefixlen); + + /* dst address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(&x->id.daddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + BUG_ON(!addr->sadb_address_prefixlen); + + if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, + x->props.family)) { + addr = skb_put(skb, + sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; + addr->sadb_address_proto = + pfkey_proto_from_xfrm(x->sel.proto); + addr->sadb_address_prefixlen = x->sel.prefixlen_s; + addr->sadb_address_reserved = 0; + + pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, + (struct sockaddr *) (addr + 1), + x->props.family); + } + + /* auth key */ + if (add_keys && auth_key_size) { + key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); + key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / + sizeof(uint64_t); + key->sadb_key_exttype = SADB_EXT_KEY_AUTH; + key->sadb_key_bits = x->aalg->alg_key_len; + key->sadb_key_reserved = 0; + memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); + } + /* encrypt key */ + if (add_keys && encrypt_key_size) { + key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); + key->sadb_key_len = (sizeof(struct sadb_key) + + encrypt_key_size) / sizeof(uint64_t); + key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; + key->sadb_key_bits = x->ealg->alg_key_len; + key->sadb_key_reserved = 0; + memcpy(key + 1, x->ealg->alg_key, + (x->ealg->alg_key_len+7)/8); + } + + /* sa */ + sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); + sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); + sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; + if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { + kfree_skb(skb); + return ERR_PTR(-EINVAL); + } + sa2->sadb_x_sa2_mode = mode; + sa2->sadb_x_sa2_reserved1 = 0; + sa2->sadb_x_sa2_reserved2 = 0; + sa2->sadb_x_sa2_sequence = 0; + sa2->sadb_x_sa2_reqid = x->props.reqid; + + if (natt && natt->encap_type) { + struct sadb_x_nat_t_type *n_type; + struct sadb_x_nat_t_port *n_port; + + /* type */ + n_type = skb_put(skb, sizeof(*n_type)); + n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); + n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; + n_type->sadb_x_nat_t_type_type = natt->encap_type; + n_type->sadb_x_nat_t_type_reserved[0] = 0; + n_type->sadb_x_nat_t_type_reserved[1] = 0; + n_type->sadb_x_nat_t_type_reserved[2] = 0; + + /* source port */ + n_port = skb_put(skb, sizeof(*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + /* dest port */ + n_port = skb_put(skb, sizeof(*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_dport; + n_port->sadb_x_nat_t_port_reserved = 0; + } + + /* security context */ + if (xfrm_ctx) { + sec_ctx = skb_put(skb, + sizeof(struct sadb_x_sec_ctx) + ctx_size); + sec_ctx->sadb_x_sec_len = + (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); + sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; + sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; + sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; + sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; + memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, + xfrm_ctx->ctx_len); + } + + return skb; +} + + +static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) +{ + struct sk_buff *skb; + + skb = __pfkey_xfrm_state2msg(x, 1, 3); + + return skb; +} + +static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, + int hsc) +{ + return __pfkey_xfrm_state2msg(x, 0, hsc); +} + +static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, + const struct sadb_msg *hdr, + void * const *ext_hdrs) +{ + struct xfrm_state *x; + const struct sadb_lifetime *lifetime; + const struct sadb_sa *sa; + const struct sadb_key *key; + const struct sadb_x_sec_ctx *sec_ctx; + uint16_t proto; + int err; + + + sa = ext_hdrs[SADB_EXT_SA - 1]; + if (!sa || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return ERR_PTR(-EINVAL); + if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && + !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) + return ERR_PTR(-EINVAL); + if (hdr->sadb_msg_satype == SADB_SATYPE_AH && + !ext_hdrs[SADB_EXT_KEY_AUTH-1]) + return ERR_PTR(-EINVAL); + if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != + !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) + return ERR_PTR(-EINVAL); + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return ERR_PTR(-EINVAL); + + /* default error is no buffer space */ + err = -ENOBUFS; + + /* RFC2367: + + Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. + SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not + sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. + Therefore, the sadb_sa_state field of all submitted SAs MUST be + SADB_SASTATE_MATURE and the kernel MUST return an error if this is + not true. + + However, KAME setkey always uses SADB_SASTATE_LARVAL. + Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. + */ + if (sa->sadb_sa_auth > SADB_AALG_MAX || + (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && + sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || + sa->sadb_sa_encrypt > SADB_EALG_MAX) + return ERR_PTR(-EINVAL); + key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; + if (key != NULL && + sa->sadb_sa_auth != SADB_X_AALG_NULL && + key->sadb_key_bits == 0) + return ERR_PTR(-EINVAL); + key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; + if (key != NULL && + sa->sadb_sa_encrypt != SADB_EALG_NULL && + key->sadb_key_bits == 0) + return ERR_PTR(-EINVAL); + + x = xfrm_state_alloc(net); + if (x == NULL) + return ERR_PTR(-ENOBUFS); + + x->id.proto = proto; + x->id.spi = sa->sadb_sa_spi; + x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, + (sizeof(x->replay.bitmap) * 8)); + if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) + x->props.flags |= XFRM_STATE_NOECN; + if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) + x->props.flags |= XFRM_STATE_DECAP_DSCP; + if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) + x->props.flags |= XFRM_STATE_NOPMTUDISC; + + lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; + if (lifetime != NULL) { + x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; + x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; + if (lifetime != NULL) { + x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; + x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + + sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; + if (sec_ctx != NULL) { + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); + + if (!uctx) + goto out; + + err = security_xfrm_state_alloc(x, uctx); + kfree(uctx); + + if (err) + goto out; + } + + err = -ENOBUFS; + key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; + if (sa->sadb_sa_auth) { + int keysize = 0; + struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); + if (!a || !a->pfkey_supported) { + err = -ENOSYS; + goto out; + } + if (key) + keysize = (key->sadb_key_bits + 7) / 8; + x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); + if (!x->aalg) { + err = -ENOMEM; + goto out; + } + strcpy(x->aalg->alg_name, a->name); + x->aalg->alg_key_len = 0; + if (key) { + x->aalg->alg_key_len = key->sadb_key_bits; + memcpy(x->aalg->alg_key, key+1, keysize); + } + x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; + x->props.aalgo = sa->sadb_sa_auth; + /* x->algo.flags = sa->sadb_sa_flags; */ + } + if (sa->sadb_sa_encrypt) { + if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { + struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); + if (!a || !a->pfkey_supported) { + err = -ENOSYS; + goto out; + } + x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); + if (!x->calg) { + err = -ENOMEM; + goto out; + } + strcpy(x->calg->alg_name, a->name); + x->props.calgo = sa->sadb_sa_encrypt; + } else { + int keysize = 0; + struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); + if (!a || !a->pfkey_supported) { + err = -ENOSYS; + goto out; + } + key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; + if (key) + keysize = (key->sadb_key_bits + 7) / 8; + x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); + if (!x->ealg) { + err = -ENOMEM; + goto out; + } + strcpy(x->ealg->alg_name, a->name); + x->ealg->alg_key_len = 0; + if (key) { + x->ealg->alg_key_len = key->sadb_key_bits; + memcpy(x->ealg->alg_key, key+1, keysize); + } + x->props.ealgo = sa->sadb_sa_encrypt; + x->geniv = a->uinfo.encr.geniv; + } + } + /* x->algo.flags = sa->sadb_sa_flags; */ + + x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + &x->props.saddr); + pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], + &x->id.daddr); + + if (ext_hdrs[SADB_X_EXT_SA2-1]) { + const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; + int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); + if (mode < 0) { + err = -EINVAL; + goto out; + } + x->props.mode = mode; + x->props.reqid = sa2->sadb_x_sa2_reqid; + } + + if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { + const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; + + /* Nobody uses this, but we try. */ + x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); + x->sel.prefixlen_s = addr->sadb_address_prefixlen; + } + + if (!x->sel.family) + x->sel.family = x->props.family; + + if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { + const struct sadb_x_nat_t_type* n_type; + struct xfrm_encap_tmpl *natt; + + x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); + if (!x->encap) { + err = -ENOMEM; + goto out; + } + + natt = x->encap; + n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; + natt->encap_type = n_type->sadb_x_nat_t_type_type; + + if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { + const struct sadb_x_nat_t_port *n_port = + ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; + natt->encap_sport = n_port->sadb_x_nat_t_port_port; + } + if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { + const struct sadb_x_nat_t_port *n_port = + ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; + natt->encap_dport = n_port->sadb_x_nat_t_port_port; + } + memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); + } + + err = xfrm_init_state(x); + if (err) + goto out; + + x->km.seq = hdr->sadb_msg_seq; + return x; + +out: + x->km.state = XFRM_STATE_DEAD; + xfrm_state_put(x); + return ERR_PTR(err); +} + +static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + return -EOPNOTSUPP; +} + +static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + struct sk_buff *resp_skb; + struct sadb_x_sa2 *sa2; + struct sadb_address *saddr, *daddr; + struct sadb_msg *out_hdr; + struct sadb_spirange *range; + struct xfrm_state *x = NULL; + int mode; + int err; + u32 min_spi, max_spi; + u32 reqid; + u8 proto; + unsigned short family; + xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return -EINVAL; + + if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { + mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); + if (mode < 0) + return -EINVAL; + reqid = sa2->sadb_x_sa2_reqid; + } else { + mode = 0; + reqid = 0; + } + + saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; + daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; + + family = ((struct sockaddr *)(saddr + 1))->sa_family; + switch (family) { + case AF_INET: + xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; + xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; + xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; + break; +#endif + } + + if (hdr->sadb_msg_seq) { + x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); + if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { + xfrm_state_put(x); + x = NULL; + } + } + + if (!x) + x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); + + if (x == NULL) + return -ENOENT; + + min_spi = 0x100; + max_spi = 0x0fffffff; + + range = ext_hdrs[SADB_EXT_SPIRANGE-1]; + if (range) { + min_spi = range->sadb_spirange_min; + max_spi = range->sadb_spirange_max; + } + + err = verify_spi_info(x->id.proto, min_spi, max_spi); + if (err) { + xfrm_state_put(x); + return err; + } + + err = xfrm_alloc_spi(x, min_spi, max_spi); + resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); + + if (IS_ERR(resp_skb)) { + xfrm_state_put(x); + return PTR_ERR(resp_skb); + } + + out_hdr = (struct sadb_msg *) resp_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_GETSPI; + out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + + xfrm_state_put(x); + + pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); + + return 0; +} + +static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + struct xfrm_state *x; + + if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) + return -EOPNOTSUPP; + + if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) + return 0; + + x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); + if (x == NULL) + return 0; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_ACQ) + x->km.state = XFRM_STATE_ERROR; + + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return 0; +} + +static inline int event2poltype(int event) +{ + switch (event) { + case XFRM_MSG_DELPOLICY: + return SADB_X_SPDDELETE; + case XFRM_MSG_NEWPOLICY: + return SADB_X_SPDADD; + case XFRM_MSG_UPDPOLICY: + return SADB_X_SPDUPDATE; + case XFRM_MSG_POLEXPIRE: + // return SADB_X_SPDEXPIRE; + default: + pr_err("pfkey: Unknown policy event %d\n", event); + break; + } + + return 0; +} + +static inline int event2keytype(int event) +{ + switch (event) { + case XFRM_MSG_DELSA: + return SADB_DELETE; + case XFRM_MSG_NEWSA: + return SADB_ADD; + case XFRM_MSG_UPDSA: + return SADB_UPDATE; + case XFRM_MSG_EXPIRE: + return SADB_EXPIRE; + default: + pr_err("pfkey: Unknown SA event %d\n", event); + break; + } + + return 0; +} + +/* ADD/UPD/DEL */ +static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + + skb = pfkey_xfrm_state2msg(x); + + if (IS_ERR(skb)) + return PTR_ERR(skb); + + hdr = (struct sadb_msg *) skb->data; + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = event2keytype(c->event); + hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = c->seq; + hdr->sadb_msg_pid = c->portid; + + pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); + + return 0; +} + +static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + struct xfrm_state *x; + int err; + struct km_event c; + + x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); + if (IS_ERR(x)) + return PTR_ERR(x); + + xfrm_state_hold(x); + if (hdr->sadb_msg_type == SADB_ADD) + 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_state_put(x); + goto out; + } + + if (hdr->sadb_msg_type == SADB_ADD) + c.event = XFRM_MSG_NEWSA; + else + c.event = XFRM_MSG_UPDSA; + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + km_state_notify(x, &c); +out: + xfrm_state_put(x); + return err; +} + +static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + struct xfrm_state *x; + struct km_event c; + int err; + + if (!ext_hdrs[SADB_EXT_SA-1] || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); + if (x == NULL) + return -ESRCH; + + if ((err = security_xfrm_state_delete(x))) + goto out; + + if (xfrm_state_kern(x)) { + err = -EPERM; + goto out; + } + + err = xfrm_state_delete(x); + + if (err < 0) + goto out; + + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + c.event = XFRM_MSG_DELSA; + km_state_notify(x, &c); +out: + xfrm_audit_state_delete(x, err ? 0 : 1, true); + xfrm_state_put(x); + + return err; +} + +static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + __u8 proto; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + struct xfrm_state *x; + + if (!ext_hdrs[SADB_EXT_SA-1] || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); + if (x == NULL) + return -ESRCH; + + out_skb = pfkey_xfrm_state2msg(x); + proto = x->id.proto; + xfrm_state_put(x); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_GET; + out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); + + return 0; +} + +static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, + gfp_t allocation) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + int len, auth_len, enc_len, i; + + auth_len = xfrm_count_pfkey_auth_supported(); + if (auth_len) { + auth_len *= sizeof(struct sadb_alg); + auth_len += sizeof(struct sadb_supported); + } + + enc_len = xfrm_count_pfkey_enc_supported(); + if (enc_len) { + enc_len *= sizeof(struct sadb_alg); + enc_len += sizeof(struct sadb_supported); + } + + len = enc_len + auth_len + sizeof(struct sadb_msg); + + skb = alloc_skb(len + 16, allocation); + if (!skb) + goto out_put_algs; + + hdr = skb_put(skb, sizeof(*hdr)); + pfkey_hdr_dup(hdr, orig); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_len = len / sizeof(uint64_t); + + if (auth_len) { + struct sadb_supported *sp; + struct sadb_alg *ap; + + sp = skb_put(skb, auth_len); + ap = (struct sadb_alg *) (sp + 1); + + sp->sadb_supported_len = auth_len / sizeof(uint64_t); + sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + if (!aalg->pfkey_supported) + continue; + if (aalg->available) + *ap++ = aalg->desc; + } + } + + if (enc_len) { + struct sadb_supported *sp; + struct sadb_alg *ap; + + sp = skb_put(skb, enc_len); + ap = (struct sadb_alg *) (sp + 1); + + sp->sadb_supported_len = enc_len / sizeof(uint64_t); + sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + if (!ealg->pfkey_supported) + continue; + if (ealg->available) + *ap++ = ealg->desc; + } + } + +out_put_algs: + return skb; +} + +static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct pfkey_sock *pfk = pfkey_sk(sk); + struct sk_buff *supp_skb; + + if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) + return -EINVAL; + + if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { + if (pfk->registered&(1<<hdr->sadb_msg_satype)) + return -EEXIST; + pfk->registered |= (1<<hdr->sadb_msg_satype); + } + + mutex_lock(&pfkey_mutex); + xfrm_probe_algs(); + + supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); + mutex_unlock(&pfkey_mutex); + + if (!supp_skb) { + if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) + pfk->registered &= ~(1<<hdr->sadb_msg_satype); + + return -ENOBUFS; + } + + pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, + sock_net(sk)); + return 0; +} + +static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + + skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); + if (!skb) + return -ENOBUFS; + + hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); + hdr->sadb_msg_errno = (uint8_t) 0; + hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); + + return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, + sock_net(sk)); +} + +static int key_notify_sa_flush(const struct km_event *c) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + + skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); + if (!skb) + return -ENOBUFS; + hdr = skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); + hdr->sadb_msg_type = SADB_FLUSH; + hdr->sadb_msg_seq = c->seq; + hdr->sadb_msg_pid = c->portid; + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_errno = (uint8_t) 0; + hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); + hdr->sadb_msg_reserved = 0; + + pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); + + return 0; +} + +static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + unsigned int proto; + struct km_event c; + int err, err2; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return -EINVAL; + + err = xfrm_state_flush(net, proto, true, false); + err2 = unicast_flush_resp(sk, hdr); + if (err || err2) { + if (err == -ESRCH) /* empty table - go quietly */ + err = 0; + return err ? err : err2; + } + + c.data.proto = proto; + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + c.event = XFRM_MSG_FLUSHSA; + c.net = net; + km_state_notify(NULL, &c); + + return 0; +} + +static int dump_sa(struct xfrm_state *x, int count, void *ptr) +{ + struct pfkey_sock *pfk = ptr; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + + if (!pfkey_can_dump(&pfk->sk)) + return -ENOBUFS; + + out_skb = pfkey_xfrm_state2msg(x); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = pfk->dump.msg_version; + out_hdr->sadb_msg_type = SADB_DUMP; + out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = count + 1; + out_hdr->sadb_msg_pid = pfk->dump.msg_portid; + + if (pfk->dump.skb) + pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, + &pfk->sk, sock_net(&pfk->sk)); + pfk->dump.skb = out_skb; + + return 0; +} + +static int pfkey_dump_sa(struct pfkey_sock *pfk) +{ + struct net *net = sock_net(&pfk->sk); + return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); +} + +static void pfkey_dump_sa_done(struct pfkey_sock *pfk) +{ + struct net *net = sock_net(&pfk->sk); + + xfrm_state_walk_done(&pfk->dump.u.state, net); +} + +static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + u8 proto; + struct xfrm_address_filter *filter = NULL; + struct pfkey_sock *pfk = pfkey_sk(sk); + + mutex_lock(&pfk->dump_lock); + if (pfk->dump.dump != NULL) { + mutex_unlock(&pfk->dump_lock); + return -EBUSY; + } + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) { + mutex_unlock(&pfk->dump_lock); + return -EINVAL; + } + + if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { + struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; + + if ((xfilter->sadb_x_filter_splen > + (sizeof(xfrm_address_t) << 3)) || + (xfilter->sadb_x_filter_dplen > + (sizeof(xfrm_address_t) << 3))) { + mutex_unlock(&pfk->dump_lock); + return -EINVAL; + } + filter = kmalloc(sizeof(*filter), GFP_KERNEL); + if (filter == NULL) { + mutex_unlock(&pfk->dump_lock); + return -ENOMEM; + } + + memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, + sizeof(xfrm_address_t)); + memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, + sizeof(xfrm_address_t)); + filter->family = xfilter->sadb_x_filter_family; + filter->splen = xfilter->sadb_x_filter_splen; + filter->dplen = xfilter->sadb_x_filter_dplen; + } + + pfk->dump.msg_version = hdr->sadb_msg_version; + pfk->dump.msg_portid = hdr->sadb_msg_pid; + pfk->dump.dump = pfkey_dump_sa; + pfk->dump.done = pfkey_dump_sa_done; + xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); + mutex_unlock(&pfk->dump_lock); + + return pfkey_do_dump(pfk); +} + +static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct pfkey_sock *pfk = pfkey_sk(sk); + int satype = hdr->sadb_msg_satype; + bool reset_errno = false; + + if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { + reset_errno = true; + if (satype != 0 && satype != 1) + return -EINVAL; + pfk->promisc = satype; + } + if (reset_errno && skb_cloned(skb)) + skb = skb_copy(skb, GFP_KERNEL); + else + skb = skb_clone(skb, GFP_KERNEL); + + if (reset_errno && skb) { + struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; + new_hdr->sadb_msg_errno = 0; + } + + pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); + return 0; +} + +static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + int i; + u32 reqid = *(u32*)ptr; + + for (i=0; i<xp->xfrm_nr; i++) { + if (xp->xfrm_vec[i].reqid == reqid) + return -EEXIST; + } + return 0; +} + +static u32 gen_reqid(struct net *net) +{ + struct xfrm_policy_walk walk; + u32 start; + int rc; + static u32 reqid = IPSEC_MANUAL_REQID_MAX; + + start = reqid; + do { + ++reqid; + if (reqid == 0) + reqid = IPSEC_MANUAL_REQID_MAX+1; + xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); + rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); + xfrm_policy_walk_done(&walk, net); + if (rc != -EEXIST) + return reqid; + } while (reqid != start); + return 0; +} + +static int +parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol, + struct sadb_x_ipsecrequest *rq) +{ + struct net *net = xp_net(xp); + struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; + int mode; + + if (xp->xfrm_nr >= XFRM_MAX_DEPTH) + return -ELOOP; + + if (rq->sadb_x_ipsecrequest_mode == 0) + return -EINVAL; + if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) + return -EINVAL; + + t->id.proto = rq->sadb_x_ipsecrequest_proto; + if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) + return -EINVAL; + t->mode = mode; + if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) { + if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) && + pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND) + return -EINVAL; + t->optional = 1; + } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { + t->reqid = rq->sadb_x_ipsecrequest_reqid; + if (t->reqid > IPSEC_MANUAL_REQID_MAX) + t->reqid = 0; + if (!t->reqid && !(t->reqid = gen_reqid(net))) + return -ENOBUFS; + } + + /* addresses present only in tunnel mode */ + if (t->mode == XFRM_MODE_TUNNEL) { + int err; + + err = parse_sockaddr_pair( + (struct sockaddr *)(rq + 1), + rq->sadb_x_ipsecrequest_len - sizeof(*rq), + &t->saddr, &t->id.daddr, &t->encap_family); + if (err) + return err; + } else + t->encap_family = xp->family; + + /* No way to set this via kame pfkey */ + t->allalgs = 1; + xp->xfrm_nr++; + return 0; +} + +static int +parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) +{ + int err; + int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); + struct sadb_x_ipsecrequest *rq = (void*)(pol+1); + + if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) + return -EINVAL; + + while (len >= sizeof(*rq)) { + if (len < rq->sadb_x_ipsecrequest_len || + rq->sadb_x_ipsecrequest_len < sizeof(*rq)) + return -EINVAL; + + if ((err = parse_ipsecrequest(xp, pol, rq)) < 0) + return err; + len -= rq->sadb_x_ipsecrequest_len; + rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); + } + return 0; +} + +static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) +{ + struct xfrm_sec_ctx *xfrm_ctx = xp->security; + + if (xfrm_ctx) { + int len = sizeof(struct sadb_x_sec_ctx); + len += xfrm_ctx->ctx_len; + return PFKEY_ALIGN8(len); + } + return 0; +} + +static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) +{ + const struct xfrm_tmpl *t; + int sockaddr_size = pfkey_sockaddr_size(xp->family); + int socklen = 0; + int i; + + for (i=0; i<xp->xfrm_nr; i++) { + t = xp->xfrm_vec + i; + socklen += pfkey_sockaddr_len(t->encap_family); + } + + return sizeof(struct sadb_msg) + + (sizeof(struct sadb_lifetime) * 3) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + sizeof(struct sadb_x_policy) + + (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + + (socklen * 2) + + pfkey_xfrm_policy2sec_ctx_size(xp); +} + +static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) +{ + struct sk_buff *skb; + int size; + + size = pfkey_xfrm_policy2msg_size(xp); + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return ERR_PTR(-ENOBUFS); + + return skb; +} + +static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) +{ + struct sadb_msg *hdr; + struct sadb_address *addr; + struct sadb_lifetime *lifetime; + struct sadb_x_policy *pol; + struct sadb_x_sec_ctx *sec_ctx; + struct xfrm_sec_ctx *xfrm_ctx; + int i; + int size; + int sockaddr_size = pfkey_sockaddr_size(xp->family); + int socklen = pfkey_sockaddr_len(xp->family); + + size = pfkey_xfrm_policy2msg_size(xp); + + /* call should fill header later */ + hdr = skb_put(skb, sizeof(struct sadb_msg)); + memset(hdr, 0, size); /* XXX do we need this ? */ + + /* src address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); + addr->sadb_address_prefixlen = xp->selector.prefixlen_s; + addr->sadb_address_reserved = 0; + if (!pfkey_sockaddr_fill(&xp->selector.saddr, + xp->selector.sport, + (struct sockaddr *) (addr + 1), + xp->family)) + BUG(); + + /* dst address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); + addr->sadb_address_prefixlen = xp->selector.prefixlen_d; + addr->sadb_address_reserved = 0; + + pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, + (struct sockaddr *) (addr + 1), + xp->family); + + /* hard time */ + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); + lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; + lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; + /* soft time */ + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; + lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); + lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; + lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; + /* current time */ + lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; + lifetime->sadb_lifetime_allocations = xp->curlft.packets; + lifetime->sadb_lifetime_bytes = xp->curlft.bytes; + lifetime->sadb_lifetime_addtime = xp->curlft.add_time; + lifetime->sadb_lifetime_usetime = xp->curlft.use_time; + + pol = skb_put(skb, sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; + if (xp->action == XFRM_POLICY_ALLOW) { + if (xp->xfrm_nr) + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + else + pol->sadb_x_policy_type = IPSEC_POLICY_NONE; + } + pol->sadb_x_policy_dir = dir+1; + pol->sadb_x_policy_reserved = 0; + pol->sadb_x_policy_id = xp->index; + pol->sadb_x_policy_priority = xp->priority; + + for (i=0; i<xp->xfrm_nr; i++) { + const struct xfrm_tmpl *t = xp->xfrm_vec + i; + struct sadb_x_ipsecrequest *rq; + int req_size; + int mode; + + req_size = sizeof(struct sadb_x_ipsecrequest); + if (t->mode == XFRM_MODE_TUNNEL) { + socklen = pfkey_sockaddr_len(t->encap_family); + req_size += socklen * 2; + } else { + size -= 2*socklen; + } + rq = skb_put(skb, req_size); + pol->sadb_x_policy_len += req_size/8; + memset(rq, 0, sizeof(*rq)); + rq->sadb_x_ipsecrequest_len = req_size; + rq->sadb_x_ipsecrequest_proto = t->id.proto; + if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) + return -EINVAL; + rq->sadb_x_ipsecrequest_mode = mode; + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; + if (t->reqid) + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; + if (t->optional) + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; + rq->sadb_x_ipsecrequest_reqid = t->reqid; + + if (t->mode == XFRM_MODE_TUNNEL) { + u8 *sa = (void *)(rq + 1); + pfkey_sockaddr_fill(&t->saddr, 0, + (struct sockaddr *)sa, + t->encap_family); + pfkey_sockaddr_fill(&t->id.daddr, 0, + (struct sockaddr *) (sa + socklen), + t->encap_family); + } + } + + /* security context */ + if ((xfrm_ctx = xp->security)) { + int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); + + sec_ctx = skb_put(skb, ctx_size); + sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); + sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; + sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; + sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; + sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; + memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, + xfrm_ctx->ctx_len); + } + + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); + + return 0; +} + +static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + int err; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + err = pfkey_xfrm_policy2msg(out_skb, xp, dir); + if (err < 0) { + kfree_skb(out_skb); + return err; + } + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = PF_KEY_V2; + + if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) + out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; + else + out_hdr->sadb_msg_type = event2poltype(c->event); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = c->seq; + out_hdr->sadb_msg_pid = c->portid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); + return 0; + +} + +static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + int err = 0; + struct sadb_lifetime *lifetime; + struct sadb_address *sa; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct km_event c; + struct sadb_x_sec_ctx *sec_ctx; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || + !ext_hdrs[SADB_X_EXT_POLICY-1]) + return -EINVAL; + + pol = ext_hdrs[SADB_X_EXT_POLICY-1]; + if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) + return -EINVAL; + if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) + return -EINVAL; + + xp = xfrm_policy_alloc(net, GFP_KERNEL); + if (xp == NULL) + return -ENOBUFS; + + xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? + XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); + xp->priority = pol->sadb_x_policy_priority; + + sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; + xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); + xp->selector.family = xp->family; + xp->selector.prefixlen_s = sa->sadb_address_prefixlen; + xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (xp->selector.sport) + xp->selector.sport_mask = htons(0xffff); + + sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; + pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); + xp->selector.prefixlen_d = sa->sadb_address_prefixlen; + + /* Amusing, we set this twice. KAME apps appear to set same value + * in both addresses. + */ + xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + + xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (xp->selector.dport) + xp->selector.dport_mask = htons(0xffff); + + sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; + if (sec_ctx != NULL) { + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); + + if (!uctx) { + err = -ENOBUFS; + goto out; + } + + err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); + kfree(uctx); + + if (err) + goto out; + } + + xp->lft.soft_byte_limit = XFRM_INF; + xp->lft.hard_byte_limit = XFRM_INF; + xp->lft.soft_packet_limit = XFRM_INF; + xp->lft.hard_packet_limit = XFRM_INF; + if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { + xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; + xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { + xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; + xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + xp->xfrm_nr = 0; + if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && + (err = parse_ipsecrequests(xp, pol)) < 0) + goto out; + + err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, + hdr->sadb_msg_type != SADB_X_SPDUPDATE); + + xfrm_audit_policy_add(xp, err ? 0 : 1, true); + + if (err) + goto out; + + if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) + c.event = XFRM_MSG_UPDPOLICY; + else + c.event = XFRM_MSG_NEWPOLICY; + + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + + km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); + xfrm_pol_put(xp); + return 0; + +out: + xp->walk.dead = 1; + xfrm_policy_destroy(xp); + return err; +} + +static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + int err; + struct sadb_address *sa; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct xfrm_selector sel; + struct km_event c; + struct sadb_x_sec_ctx *sec_ctx; + struct xfrm_sec_ctx *pol_ctx = NULL; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || + !ext_hdrs[SADB_X_EXT_POLICY-1]) + return -EINVAL; + + pol = ext_hdrs[SADB_X_EXT_POLICY-1]; + if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) + return -EINVAL; + + memset(&sel, 0, sizeof(sel)); + + sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; + sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); + sel.prefixlen_s = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (sel.sport) + sel.sport_mask = htons(0xffff); + + sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; + pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); + sel.prefixlen_d = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (sel.dport) + sel.dport_mask = htons(0xffff); + + sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; + if (sec_ctx != NULL) { + struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); + + if (!uctx) + return -ENOMEM; + + err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); + kfree(uctx); + if (err) + return err; + } + + xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, + pol->sadb_x_policy_dir - 1, &sel, pol_ctx, + 1, &err); + security_xfrm_policy_free(pol_ctx); + if (xp == NULL) + return -ENOENT; + + xfrm_audit_policy_delete(xp, err ? 0 : 1, true); + + if (err) + goto out; + + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + c.data.byid = 0; + c.event = XFRM_MSG_DELPOLICY; + km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); + +out: + xfrm_pol_put(xp); + return err; +} + +static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) +{ + int err; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + err = 0; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) { + err = PTR_ERR(out_skb); + goto out; + } + err = pfkey_xfrm_policy2msg(out_skb, xp, dir); + if (err < 0) { + kfree_skb(out_skb); + goto out; + } + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = hdr->sadb_msg_type; + out_hdr->sadb_msg_satype = 0; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); + err = 0; + +out: + return err; +} + +static int pfkey_sockaddr_pair_size(sa_family_t family) +{ + return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); +} + +static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, + xfrm_address_t *saddr, xfrm_address_t *daddr, + u16 *family) +{ + int af, socklen; + + if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) + return -EINVAL; + + af = pfkey_sockaddr_extract(sa, saddr); + if (!af) + return -EINVAL; + + socklen = pfkey_sockaddr_len(af); + if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), + daddr) != af) + return -EINVAL; + + *family = af; + return 0; +} + +#ifdef CONFIG_NET_KEY_MIGRATE +static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, + struct xfrm_migrate *m) +{ + int err; + struct sadb_x_ipsecrequest *rq2; + int mode; + + if (len < sizeof(*rq1) || + len < rq1->sadb_x_ipsecrequest_len || + rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) + return -EINVAL; + + /* old endoints */ + err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), + rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), + &m->old_saddr, &m->old_daddr, + &m->old_family); + if (err) + return err; + + rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); + len -= rq1->sadb_x_ipsecrequest_len; + + if (len <= sizeof(*rq2) || + len < rq2->sadb_x_ipsecrequest_len || + rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) + return -EINVAL; + + /* new endpoints */ + err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), + rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), + &m->new_saddr, &m->new_daddr, + &m->new_family); + if (err) + return err; + + if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || + rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || + rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) + return -EINVAL; + + m->proto = rq1->sadb_x_ipsecrequest_proto; + if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) + return -EINVAL; + m->mode = mode; + m->reqid = rq1->sadb_x_ipsecrequest_reqid; + + return ((int)(rq1->sadb_x_ipsecrequest_len + + rq2->sadb_x_ipsecrequest_len)); +} + +static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, + const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + int i, len, ret, err = -EINVAL; + u8 dir; + struct sadb_address *sa; + struct sadb_x_kmaddress *kma; + struct sadb_x_policy *pol; + struct sadb_x_ipsecrequest *rq; + struct xfrm_selector sel; + struct xfrm_migrate m[XFRM_MAX_DEPTH]; + struct xfrm_kmaddress k; + struct net *net = sock_net(sk); + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], + ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || + !ext_hdrs[SADB_X_EXT_POLICY - 1]) { + err = -EINVAL; + goto out; + } + + kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; + pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; + + if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { + err = -EINVAL; + goto out; + } + + if (kma) { + /* convert sadb_x_kmaddress to xfrm_kmaddress */ + k.reserved = kma->sadb_x_kmaddress_reserved; + ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), + 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), + &k.local, &k.remote, &k.family); + if (ret < 0) { + err = ret; + goto out; + } + } + + dir = pol->sadb_x_policy_dir - 1; + memset(&sel, 0, sizeof(sel)); + + /* set source address info of selector */ + sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; + sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); + sel.prefixlen_s = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; + if (sel.sport) + sel.sport_mask = htons(0xffff); + + /* set destination address info of selector */ + sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; + pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); + sel.prefixlen_d = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; + if (sel.dport) + sel.dport_mask = htons(0xffff); + + rq = (struct sadb_x_ipsecrequest *)(pol + 1); + + /* extract ipsecrequests */ + i = 0; + len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); + + while (len > 0 && i < XFRM_MAX_DEPTH) { + ret = ipsecrequests_to_migrate(rq, len, &m[i]); + if (ret < 0) { + err = ret; + goto out; + } else { + rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); + len -= ret; + i++; + } + } + + if (!i || len > 0) { + err = -EINVAL; + goto out; + } + + return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, + kma ? &k : NULL, net, NULL, 0); + + out: + return err; +} +#else +static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, + const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + return -ENOPROTOOPT; +} +#endif + + +static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + unsigned int dir; + int err = 0, delete; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct km_event c; + + if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) + return -EINVAL; + + dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); + if (dir >= XFRM_POLICY_MAX) + return -EINVAL; + + delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); + xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, + dir, pol->sadb_x_policy_id, delete, &err); + if (xp == NULL) + return -ENOENT; + + if (delete) { + xfrm_audit_policy_delete(xp, err ? 0 : 1, true); + + if (err) + goto out; + c.seq = hdr->sadb_msg_seq; + c.portid = hdr->sadb_msg_pid; + c.data.byid = 1; + c.event = XFRM_MSG_DELPOLICY; + km_policy_notify(xp, dir, &c); + } else { + err = key_pol_get_resp(sk, xp, hdr, dir); + } + +out: + xfrm_pol_put(xp); + return err; +} + +static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + struct pfkey_sock *pfk = ptr; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + int err; + + if (!pfkey_can_dump(&pfk->sk)) + return -ENOBUFS; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + err = pfkey_xfrm_policy2msg(out_skb, xp, dir); + if (err < 0) { + kfree_skb(out_skb); + return err; + } + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = pfk->dump.msg_version; + out_hdr->sadb_msg_type = SADB_X_SPDDUMP; + out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = count + 1; + out_hdr->sadb_msg_pid = pfk->dump.msg_portid; + + if (pfk->dump.skb) + pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, + &pfk->sk, sock_net(&pfk->sk)); + pfk->dump.skb = out_skb; + + return 0; +} + +static int pfkey_dump_sp(struct pfkey_sock *pfk) +{ + struct net *net = sock_net(&pfk->sk); + return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); +} + +static void pfkey_dump_sp_done(struct pfkey_sock *pfk) +{ + struct net *net = sock_net((struct sock *)pfk); + + xfrm_policy_walk_done(&pfk->dump.u.policy, net); +} + +static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct pfkey_sock *pfk = pfkey_sk(sk); + + mutex_lock(&pfk->dump_lock); + if (pfk->dump.dump != NULL) { + mutex_unlock(&pfk->dump_lock); + return -EBUSY; + } + + pfk->dump.msg_version = hdr->sadb_msg_version; + pfk->dump.msg_portid = hdr->sadb_msg_pid; + pfk->dump.dump = pfkey_dump_sp; + pfk->dump.done = pfkey_dump_sp_done; + xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); + mutex_unlock(&pfk->dump_lock); + + return pfkey_do_dump(pfk); +} + +static int key_notify_policy_flush(const struct km_event *c) +{ + struct sk_buff *skb_out; + struct sadb_msg *hdr; + + skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); + if (!skb_out) + return -ENOBUFS; + hdr = skb_put(skb_out, sizeof(struct sadb_msg)); + hdr->sadb_msg_type = SADB_X_SPDFLUSH; + hdr->sadb_msg_seq = c->seq; + hdr->sadb_msg_pid = c->portid; + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_errno = (uint8_t) 0; + hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; + hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); + hdr->sadb_msg_reserved = 0; + pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); + return 0; + +} + +static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) +{ + struct net *net = sock_net(sk); + struct km_event c; + int err, err2; + + err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); + err2 = unicast_flush_resp(sk, hdr); + if (err || err2) { + if (err == -ESRCH) /* empty table - old silent behavior */ + return 0; + return err; + } + + c.data.type = XFRM_POLICY_TYPE_MAIN; + c.event = XFRM_MSG_FLUSHPOLICY; + c.portid = hdr->sadb_msg_pid; + c.seq = hdr->sadb_msg_seq; + c.net = net; + km_policy_notify(NULL, 0, &c); + + return 0; +} + +typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, + const struct sadb_msg *hdr, void * const *ext_hdrs); +static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { + [SADB_RESERVED] = pfkey_reserved, + [SADB_GETSPI] = pfkey_getspi, + [SADB_UPDATE] = pfkey_add, + [SADB_ADD] = pfkey_add, + [SADB_DELETE] = pfkey_delete, + [SADB_GET] = pfkey_get, + [SADB_ACQUIRE] = pfkey_acquire, + [SADB_REGISTER] = pfkey_register, + [SADB_EXPIRE] = NULL, + [SADB_FLUSH] = pfkey_flush, + [SADB_DUMP] = pfkey_dump, + [SADB_X_PROMISC] = pfkey_promisc, + [SADB_X_PCHANGE] = NULL, + [SADB_X_SPDUPDATE] = pfkey_spdadd, + [SADB_X_SPDADD] = pfkey_spdadd, + [SADB_X_SPDDELETE] = pfkey_spddelete, + [SADB_X_SPDGET] = pfkey_spdget, + [SADB_X_SPDACQUIRE] = NULL, + [SADB_X_SPDDUMP] = pfkey_spddump, + [SADB_X_SPDFLUSH] = pfkey_spdflush, + [SADB_X_SPDSETIDX] = pfkey_spdadd, + [SADB_X_SPDDELETE2] = pfkey_spdget, + [SADB_X_MIGRATE] = pfkey_migrate, +}; + +static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) +{ + void *ext_hdrs[SADB_EXT_MAX]; + int err; + + /* Non-zero return value of pfkey_broadcast() does not always signal + * an error and even on an actual error we may still want to process + * the message so rather ignore the return value. + */ + pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, + BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); + + memset(ext_hdrs, 0, sizeof(ext_hdrs)); + err = parse_exthdrs(skb, hdr, ext_hdrs); + if (!err) { + err = -EOPNOTSUPP; + if (pfkey_funcs[hdr->sadb_msg_type]) + err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); + } + return err; +} + +static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) +{ + struct sadb_msg *hdr = NULL; + + if (skb->len < sizeof(*hdr)) { + *errp = -EMSGSIZE; + } else { + hdr = (struct sadb_msg *) skb->data; + if (hdr->sadb_msg_version != PF_KEY_V2 || + hdr->sadb_msg_reserved != 0 || + (hdr->sadb_msg_type <= SADB_RESERVED || + hdr->sadb_msg_type > SADB_MAX)) { + hdr = NULL; + *errp = -EINVAL; + } else if (hdr->sadb_msg_len != (skb->len / + sizeof(uint64_t)) || + hdr->sadb_msg_len < (sizeof(struct sadb_msg) / + sizeof(uint64_t))) { + hdr = NULL; + *errp = -EMSGSIZE; + } else { + *errp = 0; + } + } + return hdr; +} + +static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, + const struct xfrm_algo_desc *d) +{ + unsigned int id = d->desc.sadb_alg_id; + + if (id >= sizeof(t->aalgos) * 8) + return 0; + + return (t->aalgos >> id) & 1; +} + +static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, + const struct xfrm_algo_desc *d) +{ + unsigned int id = d->desc.sadb_alg_id; + + if (id >= sizeof(t->ealgos) * 8) + return 0; + + return (t->ealgos >> id) & 1; +} + +static int count_ah_combs(const struct xfrm_tmpl *t) +{ + int i, sz = 0; + + for (i = 0; ; i++) { + const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + if (!aalg->pfkey_supported) + continue; + if (aalg_tmpl_set(t, aalg)) + sz += sizeof(struct sadb_comb); + } + return sz + sizeof(struct sadb_prop); +} + +static int count_esp_combs(const struct xfrm_tmpl *t) +{ + int i, k, sz = 0; + + for (i = 0; ; i++) { + const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + + if (!ealg->pfkey_supported) + continue; + + if (!(ealg_tmpl_set(t, ealg))) + continue; + + for (k = 1; ; k++) { + const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); + if (!aalg) + break; + + if (!aalg->pfkey_supported) + continue; + + if (aalg_tmpl_set(t, aalg)) + sz += sizeof(struct sadb_comb); + } + } + return sz + sizeof(struct sadb_prop); +} + +static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) +{ + struct sadb_prop *p; + int sz = 0; + int i; + + p = skb_put(skb, sizeof(struct sadb_prop)); + p->sadb_prop_len = sizeof(struct sadb_prop)/8; + p->sadb_prop_exttype = SADB_EXT_PROPOSAL; + p->sadb_prop_replay = 32; + memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); + + for (i = 0; ; i++) { + const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + + if (!aalg->pfkey_supported) + continue; + + if (aalg_tmpl_set(t, aalg) && aalg->available) { + struct sadb_comb *c; + c = skb_put_zero(skb, sizeof(struct sadb_comb)); + p->sadb_prop_len += sizeof(struct sadb_comb)/8; + c->sadb_comb_auth = aalg->desc.sadb_alg_id; + c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; + c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; + c->sadb_comb_hard_addtime = 24*60*60; + c->sadb_comb_soft_addtime = 20*60*60; + c->sadb_comb_hard_usetime = 8*60*60; + c->sadb_comb_soft_usetime = 7*60*60; + sz += sizeof(*c); + } + } + + return sz + sizeof(*p); +} + +static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) +{ + struct sadb_prop *p; + int sz = 0; + int i, k; + + p = skb_put(skb, sizeof(struct sadb_prop)); + p->sadb_prop_len = sizeof(struct sadb_prop)/8; + p->sadb_prop_exttype = SADB_EXT_PROPOSAL; + p->sadb_prop_replay = 32; + memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); + + for (i=0; ; i++) { + const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + + if (!ealg->pfkey_supported) + continue; + + if (!(ealg_tmpl_set(t, ealg) && ealg->available)) + continue; + + for (k = 1; ; k++) { + struct sadb_comb *c; + const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); + if (!aalg) + break; + if (!aalg->pfkey_supported) + continue; + if (!(aalg_tmpl_set(t, aalg) && aalg->available)) + continue; + c = skb_put(skb, sizeof(struct sadb_comb)); + memset(c, 0, sizeof(*c)); + p->sadb_prop_len += sizeof(struct sadb_comb)/8; + c->sadb_comb_auth = aalg->desc.sadb_alg_id; + c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; + c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; + c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; + c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; + c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; + c->sadb_comb_hard_addtime = 24*60*60; + c->sadb_comb_soft_addtime = 20*60*60; + c->sadb_comb_hard_usetime = 8*60*60; + c->sadb_comb_soft_usetime = 7*60*60; + sz += sizeof(*c); + } + } + + return sz + sizeof(*p); +} + +static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) +{ + return 0; +} + +static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) +{ + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + int hard; + int hsc; + + hard = c->data.hard; + if (hard) + hsc = 2; + else + hsc = 1; + + out_skb = pfkey_xfrm_state2msg_expire(x, hsc); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = PF_KEY_V2; + out_hdr->sadb_msg_type = SADB_EXPIRE; + out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = 0; + out_hdr->sadb_msg_pid = 0; + + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, + xs_net(x)); + return 0; +} + +static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) +{ + struct net *net = x ? xs_net(x) : c->net; + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + if (atomic_read(&net_pfkey->socks_nr) == 0) + return 0; + + switch (c->event) { + case XFRM_MSG_EXPIRE: + return key_notify_sa_expire(x, c); + case XFRM_MSG_DELSA: + case XFRM_MSG_NEWSA: + case XFRM_MSG_UPDSA: + return key_notify_sa(x, c); + case XFRM_MSG_FLUSHSA: + return key_notify_sa_flush(c); + case XFRM_MSG_NEWAE: /* not yet supported */ + break; + default: + pr_err("pfkey: Unknown SA event %d\n", c->event); + break; + } + + return 0; +} + +static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) +{ + if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) + return 0; + + switch (c->event) { + case XFRM_MSG_POLEXPIRE: + return key_notify_policy_expire(xp, c); + case XFRM_MSG_DELPOLICY: + case XFRM_MSG_NEWPOLICY: + case XFRM_MSG_UPDPOLICY: + return key_notify_policy(xp, dir, c); + case XFRM_MSG_FLUSHPOLICY: + if (c->data.type != XFRM_POLICY_TYPE_MAIN) + break; + return key_notify_policy_flush(c); + default: + pr_err("pfkey: Unknown policy event %d\n", c->event); + break; + } + + return 0; +} + +static u32 get_acqseq(void) +{ + u32 res; + static atomic_t acqseq; + + do { + res = atomic_inc_return(&acqseq); + } while (!res); + return res; +} + +static bool pfkey_is_alive(const struct km_event *c) +{ + struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); + struct sock *sk; + bool is_alive = false; + + rcu_read_lock(); + sk_for_each_rcu(sk, &net_pfkey->table) { + if (pfkey_sk(sk)->registered) { + is_alive = true; + break; + } + } + rcu_read_unlock(); + + return is_alive; +} + +static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_address *addr; + struct sadb_x_policy *pol; + int sockaddr_size; + int size; + struct sadb_x_sec_ctx *sec_ctx; + struct xfrm_sec_ctx *xfrm_ctx; + int ctx_size = 0; + int alg_size = 0; + + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return -EINVAL; + + size = sizeof(struct sadb_msg) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + sizeof(struct sadb_x_policy); + + if (x->id.proto == IPPROTO_AH) + alg_size = count_ah_combs(t); + else if (x->id.proto == IPPROTO_ESP) + alg_size = count_esp_combs(t); + + if ((xfrm_ctx = x->security)) { + ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); + size += sizeof(struct sadb_x_sec_ctx) + ctx_size; + } + + skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + hdr = skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = SADB_ACQUIRE; + hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = x->km.seq = get_acqseq(); + hdr->sadb_msg_pid = 0; + + /* src address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(&x->props.saddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + if (!addr->sadb_address_prefixlen) + BUG(); + + /* dst address */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(&x->id.daddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + if (!addr->sadb_address_prefixlen) + BUG(); + + pol = skb_put(skb, sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; + pol->sadb_x_policy_reserved = 0; + pol->sadb_x_policy_id = xp->index; + pol->sadb_x_policy_priority = xp->priority; + + /* Set sadb_comb's. */ + alg_size = 0; + if (x->id.proto == IPPROTO_AH) + alg_size = dump_ah_combs(skb, t); + else if (x->id.proto == IPPROTO_ESP) + alg_size = dump_esp_combs(skb, t); + + hdr->sadb_msg_len += alg_size / 8; + + /* security context */ + if (xfrm_ctx) { + sec_ctx = skb_put(skb, + sizeof(struct sadb_x_sec_ctx) + ctx_size); + sec_ctx->sadb_x_sec_len = + (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); + sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; + sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; + sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; + sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; + memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, + xfrm_ctx->ctx_len); + } + + return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, + xs_net(x)); +} + +static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, + u8 *data, int len, int *dir) +{ + struct net *net = sock_net(sk); + struct xfrm_policy *xp; + struct sadb_x_policy *pol = (struct sadb_x_policy*)data; + struct sadb_x_sec_ctx *sec_ctx; + + switch (sk->sk_family) { + case AF_INET: + if (opt != IP_IPSEC_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + if (opt != IPV6_IPSEC_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#endif + default: + *dir = -EINVAL; + return NULL; + } + + *dir = -EINVAL; + + if (len < sizeof(struct sadb_x_policy) || + pol->sadb_x_policy_len*8 > len || + pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || + (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) + return NULL; + + xp = xfrm_policy_alloc(net, GFP_ATOMIC); + if (xp == NULL) { + *dir = -ENOBUFS; + return NULL; + } + + xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? + XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); + + xp->lft.soft_byte_limit = XFRM_INF; + xp->lft.hard_byte_limit = XFRM_INF; + xp->lft.soft_packet_limit = XFRM_INF; + xp->lft.hard_packet_limit = XFRM_INF; + xp->family = sk->sk_family; + + xp->xfrm_nr = 0; + if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && + (*dir = parse_ipsecrequests(xp, pol)) < 0) + goto out; + + /* security context too */ + if (len >= (pol->sadb_x_policy_len*8 + + sizeof(struct sadb_x_sec_ctx))) { + char *p = (char *)pol; + struct xfrm_user_sec_ctx *uctx; + + p += pol->sadb_x_policy_len*8; + sec_ctx = (struct sadb_x_sec_ctx *)p; + if (len < pol->sadb_x_policy_len*8 + + sec_ctx->sadb_x_sec_len*8) { + *dir = -EINVAL; + goto out; + } + if ((*dir = verify_sec_ctx_len(p))) + goto out; + uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); + *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); + kfree(uctx); + + if (*dir) + goto out; + } + + *dir = pol->sadb_x_policy_dir-1; + return xp; + +out: + xp->walk.dead = 1; + xfrm_policy_destroy(xp); + return NULL; +} + +static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_sa *sa; + struct sadb_address *addr; + struct sadb_x_nat_t_port *n_port; + int sockaddr_size; + int size; + __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); + struct xfrm_encap_tmpl *natt = NULL; + + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return -EINVAL; + + if (!satype) + return -EINVAL; + + if (!x->encap) + return -EINVAL; + + natt = x->encap; + + /* Build an SADB_X_NAT_T_NEW_MAPPING message: + * + * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | + * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) + */ + + size = sizeof(struct sadb_msg) + + sizeof(struct sadb_sa) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + (sizeof(struct sadb_x_nat_t_port) * 2); + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + hdr = skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; + hdr->sadb_msg_satype = satype; + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = x->km.seq = get_acqseq(); + hdr->sadb_msg_pid = 0; + + /* SA */ + sa = skb_put(skb, sizeof(struct sadb_sa)); + sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_spi = x->id.spi; + sa->sadb_sa_replay = 0; + sa->sadb_sa_state = 0; + sa->sadb_sa_auth = 0; + sa->sadb_sa_encrypt = 0; + sa->sadb_sa_flags = 0; + + /* ADDRESS_SRC (old addr) */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(&x->props.saddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + if (!addr->sadb_address_prefixlen) + BUG(); + + /* NAT_T_SPORT (old port) */ + n_port = skb_put(skb, sizeof(*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + /* ADDRESS_DST (new addr) */ + addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + addr->sadb_address_prefixlen = + pfkey_sockaddr_fill(ipaddr, 0, + (struct sockaddr *) (addr + 1), + x->props.family); + if (!addr->sadb_address_prefixlen) + BUG(); + + /* NAT_T_DPORT (new port) */ + n_port = skb_put(skb, sizeof(*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; + n_port->sadb_x_nat_t_port_port = sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, + xs_net(x)); +} + +#ifdef CONFIG_NET_KEY_MIGRATE +static int set_sadb_address(struct sk_buff *skb, int sasize, int type, + const struct xfrm_selector *sel) +{ + struct sadb_address *addr; + addr = skb_put(skb, sizeof(struct sadb_address) + sasize); + addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; + addr->sadb_address_exttype = type; + addr->sadb_address_proto = sel->proto; + addr->sadb_address_reserved = 0; + + switch (type) { + case SADB_EXT_ADDRESS_SRC: + addr->sadb_address_prefixlen = sel->prefixlen_s; + pfkey_sockaddr_fill(&sel->saddr, 0, + (struct sockaddr *)(addr + 1), + sel->family); + break; + case SADB_EXT_ADDRESS_DST: + addr->sadb_address_prefixlen = sel->prefixlen_d; + pfkey_sockaddr_fill(&sel->daddr, 0, + (struct sockaddr *)(addr + 1), + sel->family); + break; + default: + return -EINVAL; + } + + return 0; +} + + +static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) +{ + struct sadb_x_kmaddress *kma; + u8 *sa; + int family = k->family; + int socklen = pfkey_sockaddr_len(family); + int size_req; + + size_req = (sizeof(struct sadb_x_kmaddress) + + pfkey_sockaddr_pair_size(family)); + + kma = skb_put_zero(skb, size_req); + kma->sadb_x_kmaddress_len = size_req / 8; + kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; + kma->sadb_x_kmaddress_reserved = k->reserved; + + sa = (u8 *)(kma + 1); + if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || + !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) + return -EINVAL; + + return 0; +} + +static int set_ipsecrequest(struct sk_buff *skb, + uint8_t proto, uint8_t mode, int level, + uint32_t reqid, uint8_t family, + const xfrm_address_t *src, const xfrm_address_t *dst) +{ + struct sadb_x_ipsecrequest *rq; + u8 *sa; + int socklen = pfkey_sockaddr_len(family); + int size_req; + + size_req = sizeof(struct sadb_x_ipsecrequest) + + pfkey_sockaddr_pair_size(family); + + rq = skb_put_zero(skb, size_req); + rq->sadb_x_ipsecrequest_len = size_req; + rq->sadb_x_ipsecrequest_proto = proto; + rq->sadb_x_ipsecrequest_mode = mode; + rq->sadb_x_ipsecrequest_level = level; + rq->sadb_x_ipsecrequest_reqid = reqid; + + sa = (u8 *) (rq + 1); + if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || + !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) + return -EINVAL; + + return 0; +} +#endif + +#ifdef CONFIG_NET_KEY_MIGRATE +static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_bundles, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap) +{ + int i; + int sasize_sel; + int size = 0; + int size_pol = 0; + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_x_policy *pol; + const struct xfrm_migrate *mp; + + if (type != XFRM_POLICY_TYPE_MAIN) + return 0; + + if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) + return -EINVAL; + + if (k != NULL) { + /* addresses for KM */ + size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + + pfkey_sockaddr_pair_size(k->family)); + } + + /* selector */ + sasize_sel = pfkey_sockaddr_size(sel->family); + if (!sasize_sel) + return -EINVAL; + size += (sizeof(struct sadb_address) + sasize_sel) * 2; + + /* policy info */ + size_pol += sizeof(struct sadb_x_policy); + + /* ipsecrequests */ + for (i = 0, mp = m; i < num_bundles; i++, mp++) { + /* old locator pair */ + size_pol += sizeof(struct sadb_x_ipsecrequest) + + pfkey_sockaddr_pair_size(mp->old_family); + /* new locator pair */ + size_pol += sizeof(struct sadb_x_ipsecrequest) + + pfkey_sockaddr_pair_size(mp->new_family); + } + + size += sizeof(struct sadb_msg) + size_pol; + + /* alloc buffer */ + skb = alloc_skb(size, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + hdr = skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = SADB_X_MIGRATE; + hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); + hdr->sadb_msg_len = size / 8; + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = 0; + hdr->sadb_msg_pid = 0; + + /* Addresses to be used by KM for negotiation, if ext is available */ + if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) + goto err; + + /* selector src */ + set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); + + /* selector dst */ + set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); + + /* policy information */ + pol = skb_put(skb, sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_len = size_pol / 8; + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + pol->sadb_x_policy_dir = dir + 1; + pol->sadb_x_policy_reserved = 0; + pol->sadb_x_policy_id = 0; + pol->sadb_x_policy_priority = 0; + + for (i = 0, mp = m; i < num_bundles; i++, mp++) { + /* old ipsecrequest */ + int mode = pfkey_mode_from_xfrm(mp->mode); + if (mode < 0) + goto err; + if (set_ipsecrequest(skb, mp->proto, mode, + (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), + mp->reqid, mp->old_family, + &mp->old_saddr, &mp->old_daddr) < 0) + goto err; + + /* new ipsecrequest */ + if (set_ipsecrequest(skb, mp->proto, mode, + (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), + mp->reqid, mp->new_family, + &mp->new_saddr, &mp->new_daddr) < 0) + goto err; + } + + /* broadcast migrate message to sockets */ + pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); + + return 0; + +err: + kfree_skb(skb); + return -EINVAL; +} +#else +static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, + const struct xfrm_migrate *m, int num_bundles, + const struct xfrm_kmaddress *k, + const struct xfrm_encap_tmpl *encap) +{ + return -ENOPROTOOPT; +} +#endif + +static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb = NULL; + struct sadb_msg *hdr = NULL; + int err; + struct net *net = sock_net(sk); + + err = -EOPNOTSUPP; + if (msg->msg_flags & MSG_OOB) + goto out; + + err = -EMSGSIZE; + if ((unsigned int)len > sk->sk_sndbuf - 32) + goto out; + + err = -ENOBUFS; + skb = alloc_skb(len, GFP_KERNEL); + if (skb == NULL) + goto out; + + err = -EFAULT; + if (memcpy_from_msg(skb_put(skb,len), msg, len)) + goto out; + + hdr = pfkey_get_base_msg(skb, &err); + if (!hdr) + goto out; + + mutex_lock(&net->xfrm.xfrm_cfg_mutex); + err = pfkey_process(sk, skb, hdr); + mutex_unlock(&net->xfrm.xfrm_cfg_mutex); + +out: + if (err && hdr && pfkey_error(hdr, err, sk) == 0) + err = 0; + kfree_skb(skb); + + return err ? : len; +} + +static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, + int flags) +{ + struct sock *sk = sock->sk; + struct pfkey_sock *pfk = pfkey_sk(sk); + struct sk_buff *skb; + int copied, err; + + err = -EINVAL; + if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) + goto out; + + skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); + if (skb == NULL) + goto out; + + copied = skb->len; + if (copied > len) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + + skb_reset_transport_header(skb); + err = skb_copy_datagram_msg(skb, 0, msg, copied); + if (err) + goto out_free; + + sock_recv_ts_and_drops(msg, sk, skb); + + err = (flags & MSG_TRUNC) ? skb->len : copied; + + if (pfk->dump.dump != NULL && + 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) + pfkey_do_dump(pfk); + +out_free: + skb_free_datagram(sk, skb); +out: + return err; +} + +static const struct proto_ops pfkey_ops = { + .family = PF_KEY, + .owner = THIS_MODULE, + /* Operations that make no sense on pfkey sockets. */ + .bind = sock_no_bind, + .connect = sock_no_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = sock_no_getname, + .ioctl = sock_no_ioctl, + .listen = sock_no_listen, + .shutdown = sock_no_shutdown, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, + + /* Now the operations that really occur. */ + .release = pfkey_release, + .poll = datagram_poll, + .sendmsg = pfkey_sendmsg, + .recvmsg = pfkey_recvmsg, +}; + +static const struct net_proto_family pfkey_family_ops = { + .family = PF_KEY, + .create = pfkey_create, + .owner = THIS_MODULE, +}; + +#ifdef CONFIG_PROC_FS +static int pfkey_seq_show(struct seq_file *f, void *v) +{ + struct sock *s = sk_entry(v); + + if (v == SEQ_START_TOKEN) + seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); + else + seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", + s, + refcount_read(&s->sk_refcnt), + sk_rmem_alloc_get(s), + sk_wmem_alloc_get(s), + from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), + sock_i_ino(s) + ); + return 0; +} + +static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) + __acquires(rcu) +{ + struct net *net = seq_file_net(f); + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + rcu_read_lock(); + return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); +} + +static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) +{ + struct net *net = seq_file_net(f); + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); +} + +static void pfkey_seq_stop(struct seq_file *f, void *v) + __releases(rcu) +{ + rcu_read_unlock(); +} + +static const struct seq_operations pfkey_seq_ops = { + .start = pfkey_seq_start, + .next = pfkey_seq_next, + .stop = pfkey_seq_stop, + .show = pfkey_seq_show, +}; + +static int __net_init pfkey_init_proc(struct net *net) +{ + struct proc_dir_entry *e; + + e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, + sizeof(struct seq_net_private)); + if (e == NULL) + return -ENOMEM; + + return 0; +} + +static void __net_exit pfkey_exit_proc(struct net *net) +{ + remove_proc_entry("pfkey", net->proc_net); +} +#else +static inline int pfkey_init_proc(struct net *net) +{ + return 0; +} + +static inline void pfkey_exit_proc(struct net *net) +{ +} +#endif + +static struct xfrm_mgr pfkeyv2_mgr = +{ + .notify = pfkey_send_notify, + .acquire = pfkey_send_acquire, + .compile_policy = pfkey_compile_policy, + .new_mapping = pfkey_send_new_mapping, + .notify_policy = pfkey_send_policy_notify, + .migrate = pfkey_send_migrate, + .is_alive = pfkey_is_alive, +}; + +static int __net_init pfkey_net_init(struct net *net) +{ + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + int rv; + + INIT_HLIST_HEAD(&net_pfkey->table); + atomic_set(&net_pfkey->socks_nr, 0); + + rv = pfkey_init_proc(net); + + return rv; +} + +static void __net_exit pfkey_net_exit(struct net *net) +{ + struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); + + pfkey_exit_proc(net); + WARN_ON(!hlist_empty(&net_pfkey->table)); +} + +static struct pernet_operations pfkey_net_ops = { + .init = pfkey_net_init, + .exit = pfkey_net_exit, + .id = &pfkey_net_id, + .size = sizeof(struct netns_pfkey), +}; + +static void __exit ipsec_pfkey_exit(void) +{ + xfrm_unregister_km(&pfkeyv2_mgr); + sock_unregister(PF_KEY); + unregister_pernet_subsys(&pfkey_net_ops); + proto_unregister(&key_proto); +} + +static int __init ipsec_pfkey_init(void) +{ + int err = proto_register(&key_proto, 0); + + if (err != 0) + goto out; + + err = register_pernet_subsys(&pfkey_net_ops); + if (err != 0) + goto out_unregister_key_proto; + err = sock_register(&pfkey_family_ops); + if (err != 0) + goto out_unregister_pernet; + err = xfrm_register_km(&pfkeyv2_mgr); + if (err != 0) + goto out_sock_unregister; +out: + return err; + +out_sock_unregister: + sock_unregister(PF_KEY); +out_unregister_pernet: + unregister_pernet_subsys(&pfkey_net_ops); +out_unregister_key_proto: + proto_unregister(&key_proto); + goto out; +} + +module_init(ipsec_pfkey_init); +module_exit(ipsec_pfkey_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NETPROTO(PF_KEY); |