net/key/af_key.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * net/key/af_key.c An implementation of PF_KEYv2 sockets.
0004  *
0005  * Authors: Maxim Giryaev   <gem@asplinux.ru>
0006  *      David S. Miller <davem@redhat.com>
0007  *      Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
0008  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
0009  *      Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
0010  *      Derek Atkins <derek@ihtfp.com>
0011  */
0012
0013 #include <linux/capability.h>
0014 #include <linux/module.h>
0015 #include <linux/kernel.h>
0016 #include <linux/socket.h>
0017 #include <linux/pfkeyv2.h>
0018 #include <linux/ipsec.h>
0019 #include <linux/skbuff.h>
0020 #include <linux/rtnetlink.h>
0021 #include <linux/in.h>
0022 #include <linux/in6.h>
0023 #include <linux/proc_fs.h>
0024 #include <linux/init.h>
0025 #include <linux/slab.h>
0026 #include <net/net_namespace.h>
0027 #include <net/netns/generic.h>
0028 #include <net/xfrm.h>
0029
0030 #include <net/sock.h>
0031
0032 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
0033 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
0034
0035 static unsigned int pfkey_net_id __read_mostly;
0036 struct netns_pfkey {
0037     /* List of all pfkey sockets. */
0038     struct hlist_head table;
0039     atomic_t socks_nr;
0040 };
0041 static DEFINE_MUTEX(pfkey_mutex);
0042
0043 #define DUMMY_MARK 0
0044 static const struct xfrm_mark dummy_mark = {0, 0};
0045 struct pfkey_sock {
0046     /* struct sock must be the first member of struct pfkey_sock */
0047     struct sock sk;
0048     int     registered;
0049     int     promisc;
0050
0051     struct {
0052         uint8_t     msg_version;
0053         uint32_t    msg_portid;
0054         int     (*dump)(struct pfkey_sock *sk);
0055         void        (*done)(struct pfkey_sock *sk);
0056         union {
0057             struct xfrm_policy_walk policy;
0058             struct xfrm_state_walk  state;
0059         } u;
0060         struct sk_buff  *skb;
0061     } dump;
0062     struct mutex dump_lock;
0063 };
0064
0065 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
0066                    xfrm_address_t *saddr, xfrm_address_t *daddr,
0067                    u16 *family);
0068
0069 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
0070 {
0071     return (struct pfkey_sock *)sk;
0072 }
0073
0074 static int pfkey_can_dump(const struct sock *sk)
0075 {
0076     if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
0077         return 1;
0078     return 0;
0079 }
0080
0081 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
0082 {
0083     if (pfk->dump.dump) {
0084         if (pfk->dump.skb) {
0085             kfree_skb(pfk->dump.skb);
0086             pfk->dump.skb = NULL;
0087         }
0088         pfk->dump.done(pfk);
0089         pfk->dump.dump = NULL;
0090         pfk->dump.done = NULL;
0091     }
0092 }
0093
0094 static void pfkey_sock_destruct(struct sock *sk)
0095 {
0096     struct net *net = sock_net(sk);
0097     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
0098
0099     pfkey_terminate_dump(pfkey_sk(sk));
0100     skb_queue_purge(&sk->sk_receive_queue);
0101
0102     if (!sock_flag(sk, SOCK_DEAD)) {
0103         pr_err("Attempt to release alive pfkey socket: %p\n", sk);
0104         return;
0105     }
0106
0107     WARN_ON(atomic_read(&sk->sk_rmem_alloc));
0108     WARN_ON(refcount_read(&sk->sk_wmem_alloc));
0109
0110     atomic_dec(&net_pfkey->socks_nr);
0111 }
0112
0113 static const struct proto_ops pfkey_ops;
0114
0115 static void pfkey_insert(struct sock *sk)
0116 {
0117     struct net *net = sock_net(sk);
0118     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
0119
0120     mutex_lock(&pfkey_mutex);
0121     sk_add_node_rcu(sk, &net_pfkey->table);
0122     mutex_unlock(&pfkey_mutex);
0123 }
0124
0125 static void pfkey_remove(struct sock *sk)
0126 {
0127     mutex_lock(&pfkey_mutex);
0128     sk_del_node_init_rcu(sk);
0129     mutex_unlock(&pfkey_mutex);
0130 }
0131
0132 static struct proto key_proto = {
0133     .name     = "KEY",
0134     .owner    = THIS_MODULE,
0135     .obj_size = sizeof(struct pfkey_sock),
0136 };
0137
0138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
0139             int kern)
0140 {
0141     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
0142     struct sock *sk;
0143     struct pfkey_sock *pfk;
0144
0145     if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
0146         return -EPERM;
0147     if (sock->type != SOCK_RAW)
0148         return -ESOCKTNOSUPPORT;
0149     if (protocol != PF_KEY_V2)
0150         return -EPROTONOSUPPORT;
0151
0152     sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
0153     if (sk == NULL)
0154         return -ENOMEM;
0155
0156     pfk = pfkey_sk(sk);
0157     mutex_init(&pfk->dump_lock);
0158
0159     sock->ops = &pfkey_ops;
0160     sock_init_data(sock, sk);
0161
0162     sk->sk_family = PF_KEY;
0163     sk->sk_destruct = pfkey_sock_destruct;
0164
0165     atomic_inc(&net_pfkey->socks_nr);
0166
0167     pfkey_insert(sk);
0168
0169     return 0;
0170 }
0171
0172 static int pfkey_release(struct socket *sock)
0173 {
0174     struct sock *sk = sock->sk;
0175
0176     if (!sk)
0177         return 0;
0178
0179     pfkey_remove(sk);
0180
0181     sock_orphan(sk);
0182     sock->sk = NULL;
0183     skb_queue_purge(&sk->sk_write_queue);
0184
0185     synchronize_rcu();
0186     sock_put(sk);
0187
0188     return 0;
0189 }
0190
0191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
0192                    struct sock *sk)
0193 {
0194     int err = -ENOBUFS;
0195
0196     if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
0197         return err;
0198
0199     skb = skb_clone(skb, allocation);
0200
0201     if (skb) {
0202         skb_set_owner_r(skb, sk);
0203         skb_queue_tail(&sk->sk_receive_queue, skb);
0204         sk->sk_data_ready(sk);
0205         err = 0;
0206     }
0207     return err;
0208 }
0209
0210 /* Send SKB to all pfkey sockets matching selected criteria.  */
0211 #define BROADCAST_ALL       0
0212 #define BROADCAST_ONE       1
0213 #define BROADCAST_REGISTERED    2
0214 #define BROADCAST_PROMISC_ONLY  4
0215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
0216                int broadcast_flags, struct sock *one_sk,
0217                struct net *net)
0218 {
0219     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
0220     struct sock *sk;
0221     int err = -ESRCH;
0222
0223     /* XXX Do we need something like netlink_overrun?  I think
0224      * XXX PF_KEY socket apps will not mind current behavior.
0225      */
0226     if (!skb)
0227         return -ENOMEM;
0228
0229     rcu_read_lock();
0230     sk_for_each_rcu(sk, &net_pfkey->table) {
0231         struct pfkey_sock *pfk = pfkey_sk(sk);
0232         int err2;
0233
0234         /* Yes, it means that if you are meant to receive this
0235          * pfkey message you receive it twice as promiscuous
0236          * socket.
0237          */
0238         if (pfk->promisc)
0239             pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
0240
0241         /* the exact target will be processed later */
0242         if (sk == one_sk)
0243             continue;
0244         if (broadcast_flags != BROADCAST_ALL) {
0245             if (broadcast_flags & BROADCAST_PROMISC_ONLY)
0246                 continue;
0247             if ((broadcast_flags & BROADCAST_REGISTERED) &&
0248                 !pfk->registered)
0249                 continue;
0250             if (broadcast_flags & BROADCAST_ONE)
0251                 continue;
0252         }
0253
0254         err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
0255
0256         /* Error is cleared after successful sending to at least one
0257          * registered KM */
0258         if ((broadcast_flags & BROADCAST_REGISTERED) && err)
0259             err = err2;
0260     }
0261     rcu_read_unlock();
0262
0263     if (one_sk != NULL)
0264         err = pfkey_broadcast_one(skb, allocation, one_sk);
0265
0266     kfree_skb(skb);
0267     return err;
0268 }
0269
0270 static int pfkey_do_dump(struct pfkey_sock *pfk)
0271 {
0272     struct sadb_msg *hdr;
0273     int rc;
0274
0275     mutex_lock(&pfk->dump_lock);
0276     if (!pfk->dump.dump) {
0277         rc = 0;
0278         goto out;
0279     }
0280
0281     rc = pfk->dump.dump(pfk);
0282     if (rc == -ENOBUFS) {
0283         rc = 0;
0284         goto out;
0285     }
0286
0287     if (pfk->dump.skb) {
0288         if (!pfkey_can_dump(&pfk->sk)) {
0289             rc = 0;
0290             goto out;
0291         }
0292
0293         hdr = (struct sadb_msg *) pfk->dump.skb->data;
0294         hdr->sadb_msg_seq = 0;
0295         hdr->sadb_msg_errno = rc;
0296         pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
0297                 &pfk->sk, sock_net(&pfk->sk));
0298         pfk->dump.skb = NULL;
0299     }
0300
0301     pfkey_terminate_dump(pfk);
0302
0303 out:
0304     mutex_unlock(&pfk->dump_lock);
0305     return rc;
0306 }
0307
0308 static inline void pfkey_hdr_dup(struct sadb_msg *new,
0309                  const struct sadb_msg *orig)
0310 {
0311     *new = *orig;
0312 }
0313
0314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
0315 {
0316     struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
0317     struct sadb_msg *hdr;
0318
0319     if (!skb)
0320         return -ENOBUFS;
0321
0322     /* Woe be to the platform trying to support PFKEY yet
0323      * having normal errnos outside the 1-255 range, inclusive.
0324      */
0325     err = -err;
0326     if (err == ERESTARTSYS ||
0327         err == ERESTARTNOHAND ||
0328         err == ERESTARTNOINTR)
0329         err = EINTR;
0330     if (err >= 512)
0331         err = EINVAL;
0332     BUG_ON(err <= 0 || err >= 256);
0333
0334     hdr = skb_put(skb, sizeof(struct sadb_msg));
0335     pfkey_hdr_dup(hdr, orig);
0336     hdr->sadb_msg_errno = (uint8_t) err;
0337     hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
0338                  sizeof(uint64_t));
0339
0340     pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
0341
0342     return 0;
0343 }
0344
0345 static const u8 sadb_ext_min_len[] = {
0346     [SADB_EXT_RESERVED]     = (u8) 0,
0347     [SADB_EXT_SA]           = (u8) sizeof(struct sadb_sa),
0348     [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime),
0349     [SADB_EXT_LIFETIME_HARD]    = (u8) sizeof(struct sadb_lifetime),
0350     [SADB_EXT_LIFETIME_SOFT]    = (u8) sizeof(struct sadb_lifetime),
0351     [SADB_EXT_ADDRESS_SRC]      = (u8) sizeof(struct sadb_address),
0352     [SADB_EXT_ADDRESS_DST]      = (u8) sizeof(struct sadb_address),
0353     [SADB_EXT_ADDRESS_PROXY]    = (u8) sizeof(struct sadb_address),
0354     [SADB_EXT_KEY_AUTH]     = (u8) sizeof(struct sadb_key),
0355     [SADB_EXT_KEY_ENCRYPT]      = (u8) sizeof(struct sadb_key),
0356     [SADB_EXT_IDENTITY_SRC]     = (u8) sizeof(struct sadb_ident),
0357     [SADB_EXT_IDENTITY_DST]     = (u8) sizeof(struct sadb_ident),
0358     [SADB_EXT_SENSITIVITY]      = (u8) sizeof(struct sadb_sens),
0359     [SADB_EXT_PROPOSAL]     = (u8) sizeof(struct sadb_prop),
0360     [SADB_EXT_SUPPORTED_AUTH]   = (u8) sizeof(struct sadb_supported),
0361     [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
0362     [SADB_EXT_SPIRANGE]     = (u8) sizeof(struct sadb_spirange),
0363     [SADB_X_EXT_KMPRIVATE]      = (u8) sizeof(struct sadb_x_kmprivate),
0364     [SADB_X_EXT_POLICY]     = (u8) sizeof(struct sadb_x_policy),
0365     [SADB_X_EXT_SA2]        = (u8) sizeof(struct sadb_x_sa2),
0366     [SADB_X_EXT_NAT_T_TYPE]     = (u8) sizeof(struct sadb_x_nat_t_type),
0367     [SADB_X_EXT_NAT_T_SPORT]    = (u8) sizeof(struct sadb_x_nat_t_port),
0368     [SADB_X_EXT_NAT_T_DPORT]    = (u8) sizeof(struct sadb_x_nat_t_port),
0369     [SADB_X_EXT_NAT_T_OA]       = (u8) sizeof(struct sadb_address),
0370     [SADB_X_EXT_SEC_CTX]        = (u8) sizeof(struct sadb_x_sec_ctx),
0371     [SADB_X_EXT_KMADDRESS]      = (u8) sizeof(struct sadb_x_kmaddress),
0372     [SADB_X_EXT_FILTER]     = (u8) sizeof(struct sadb_x_filter),
0373 };
0374
0375 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
0376 static int verify_address_len(const void *p)
0377 {
0378     const struct sadb_address *sp = p;
0379     const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
0380     const struct sockaddr_in *sin;
0381 #if IS_ENABLED(CONFIG_IPV6)
0382     const struct sockaddr_in6 *sin6;
0383 #endif
0384     int len;
0385
0386     if (sp->sadb_address_len <
0387         DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
0388              sizeof(uint64_t)))
0389         return -EINVAL;
0390
0391     switch (addr->sa_family) {
0392     case AF_INET:
0393         len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
0394         if (sp->sadb_address_len != len ||
0395             sp->sadb_address_prefixlen > 32)
0396             return -EINVAL;
0397         break;
0398 #if IS_ENABLED(CONFIG_IPV6)
0399     case AF_INET6:
0400         len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
0401         if (sp->sadb_address_len != len ||
0402             sp->sadb_address_prefixlen > 128)
0403             return -EINVAL;
0404         break;
0405 #endif
0406     default:
0407         /* It is user using kernel to keep track of security
0408          * associations for another protocol, such as
0409          * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
0410          * lengths.
0411          *
0412          * XXX Actually, association/policy database is not yet
0413          * XXX able to cope with arbitrary sockaddr families.
0414          * XXX When it can, remove this -EINVAL.  -DaveM
0415          */
0416         return -EINVAL;
0417     }
0418
0419     return 0;
0420 }
0421
0422 static inline int sadb_key_len(const struct sadb_key *key)
0423 {
0424     int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
0425
0426     return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
0427                 sizeof(uint64_t));
0428 }
0429
0430 static int verify_key_len(const void *p)
0431 {
0432     const struct sadb_key *key = p;
0433
0434     if (sadb_key_len(key) > key->sadb_key_len)
0435         return -EINVAL;
0436
0437     return 0;
0438 }
0439
0440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
0441 {
0442     return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
0443                 sec_ctx->sadb_x_ctx_len,
0444                 sizeof(uint64_t));
0445 }
0446
0447 static inline int verify_sec_ctx_len(const void *p)
0448 {
0449     const struct sadb_x_sec_ctx *sec_ctx = p;
0450     int len = sec_ctx->sadb_x_ctx_len;
0451
0452     if (len > PAGE_SIZE)
0453         return -EINVAL;
0454
0455     len = pfkey_sec_ctx_len(sec_ctx);
0456
0457     if (sec_ctx->sadb_x_sec_len != len)
0458         return -EINVAL;
0459
0460     return 0;
0461 }
0462
0463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
0464                                      gfp_t gfp)
0465 {
0466     struct xfrm_user_sec_ctx *uctx = NULL;
0467     int ctx_size = sec_ctx->sadb_x_ctx_len;
0468
0469     uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
0470
0471     if (!uctx)
0472         return NULL;
0473
0474     uctx->len = pfkey_sec_ctx_len(sec_ctx);
0475     uctx->exttype = sec_ctx->sadb_x_sec_exttype;
0476     uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
0477     uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
0478     uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
0479     memcpy(uctx + 1, sec_ctx + 1,
0480            uctx->ctx_len);
0481
0482     return uctx;
0483 }
0484
0485 static int present_and_same_family(const struct sadb_address *src,
0486                    const struct sadb_address *dst)
0487 {
0488     const struct sockaddr *s_addr, *d_addr;
0489
0490     if (!src || !dst)
0491         return 0;
0492
0493     s_addr = (const struct sockaddr *)(src + 1);
0494     d_addr = (const struct sockaddr *)(dst + 1);
0495     if (s_addr->sa_family != d_addr->sa_family)
0496         return 0;
0497     if (s_addr->sa_family != AF_INET
0498 #if IS_ENABLED(CONFIG_IPV6)
0499         && s_addr->sa_family != AF_INET6
0500 #endif
0501         )
0502         return 0;
0503
0504     return 1;
0505 }
0506
0507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
0508 {
0509     const char *p = (char *) hdr;
0510     int len = skb->len;
0511
0512     len -= sizeof(*hdr);
0513     p += sizeof(*hdr);
0514     while (len > 0) {
0515         const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
0516         uint16_t ext_type;
0517         int ext_len;
0518
0519         if (len < sizeof(*ehdr))
0520             return -EINVAL;
0521
0522         ext_len  = ehdr->sadb_ext_len;
0523         ext_len *= sizeof(uint64_t);
0524         ext_type = ehdr->sadb_ext_type;
0525         if (ext_len < sizeof(uint64_t) ||
0526             ext_len > len ||
0527             ext_type == SADB_EXT_RESERVED)
0528             return -EINVAL;
0529
0530         if (ext_type <= SADB_EXT_MAX) {
0531             int min = (int) sadb_ext_min_len[ext_type];
0532             if (ext_len < min)
0533                 return -EINVAL;
0534             if (ext_hdrs[ext_type-1] != NULL)
0535                 return -EINVAL;
0536             switch (ext_type) {
0537             case SADB_EXT_ADDRESS_SRC:
0538             case SADB_EXT_ADDRESS_DST:
0539             case SADB_EXT_ADDRESS_PROXY:
0540             case SADB_X_EXT_NAT_T_OA:
0541                 if (verify_address_len(p))
0542                     return -EINVAL;
0543                 break;
0544             case SADB_X_EXT_SEC_CTX:
0545                 if (verify_sec_ctx_len(p))
0546                     return -EINVAL;
0547                 break;
0548             case SADB_EXT_KEY_AUTH:
0549             case SADB_EXT_KEY_ENCRYPT:
0550                 if (verify_key_len(p))
0551                     return -EINVAL;
0552                 break;
0553             default:
0554                 break;
0555             }
0556             ext_hdrs[ext_type-1] = (void *) p;
0557         }
0558         p   += ext_len;
0559         len -= ext_len;
0560     }
0561
0562     return 0;
0563 }
0564
0565 static uint16_t
0566 pfkey_satype2proto(uint8_t satype)
0567 {
0568     switch (satype) {
0569     case SADB_SATYPE_UNSPEC:
0570         return IPSEC_PROTO_ANY;
0571     case SADB_SATYPE_AH:
0572         return IPPROTO_AH;
0573     case SADB_SATYPE_ESP:
0574         return IPPROTO_ESP;
0575     case SADB_X_SATYPE_IPCOMP:
0576         return IPPROTO_COMP;
0577     default:
0578         return 0;
0579     }
0580     /* NOTREACHED */
0581 }
0582
0583 static uint8_t
0584 pfkey_proto2satype(uint16_t proto)
0585 {
0586     switch (proto) {
0587     case IPPROTO_AH:
0588         return SADB_SATYPE_AH;
0589     case IPPROTO_ESP:
0590         return SADB_SATYPE_ESP;
0591     case IPPROTO_COMP:
0592         return SADB_X_SATYPE_IPCOMP;
0593     default:
0594         return 0;
0595     }
0596     /* NOTREACHED */
0597 }
0598
0599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
0600  * say specifically 'just raw sockets' as we encode them as 255.
0601  */
0602
0603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
0604 {
0605     return proto == IPSEC_PROTO_ANY ? 0 : proto;
0606 }
0607
0608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
0609 {
0610     return proto ? proto : IPSEC_PROTO_ANY;
0611 }
0612
0613 static inline int pfkey_sockaddr_len(sa_family_t family)
0614 {
0615     switch (family) {
0616     case AF_INET:
0617         return sizeof(struct sockaddr_in);
0618 #if IS_ENABLED(CONFIG_IPV6)
0619     case AF_INET6:
0620         return sizeof(struct sockaddr_in6);
0621 #endif
0622     }
0623     return 0;
0624 }
0625
0626 static
0627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
0628 {
0629     switch (sa->sa_family) {
0630     case AF_INET:
0631         xaddr->a4 =
0632             ((struct sockaddr_in *)sa)->sin_addr.s_addr;
0633         return AF_INET;
0634 #if IS_ENABLED(CONFIG_IPV6)
0635     case AF_INET6:
0636         memcpy(xaddr->a6,
0637                &((struct sockaddr_in6 *)sa)->sin6_addr,
0638                sizeof(struct in6_addr));
0639         return AF_INET6;
0640 #endif
0641     }
0642     return 0;
0643 }
0644
0645 static
0646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
0647 {
0648     return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
0649                       xaddr);
0650 }
0651
0652 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
0653 {
0654     const struct sadb_sa *sa;
0655     const struct sadb_address *addr;
0656     uint16_t proto;
0657     unsigned short family;
0658     xfrm_address_t *xaddr;
0659
0660     sa = ext_hdrs[SADB_EXT_SA - 1];
0661     if (sa == NULL)
0662         return NULL;
0663
0664     proto = pfkey_satype2proto(hdr->sadb_msg_satype);
0665     if (proto == 0)
0666         return NULL;
0667
0668     /* sadb_address_len should be checked by caller */
0669     addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
0670     if (addr == NULL)
0671         return NULL;
0672
0673     family = ((const struct sockaddr *)(addr + 1))->sa_family;
0674     switch (family) {
0675     case AF_INET:
0676         xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
0677         break;
0678 #if IS_ENABLED(CONFIG_IPV6)
0679     case AF_INET6:
0680         xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
0681         break;
0682 #endif
0683     default:
0684         xaddr = NULL;
0685     }
0686
0687     if (!xaddr)
0688         return NULL;
0689
0690     return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
0691 }
0692
0693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
0694
0695 static int
0696 pfkey_sockaddr_size(sa_family_t family)
0697 {
0698     return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
0699 }
0700
0701 static inline int pfkey_mode_from_xfrm(int mode)
0702 {
0703     switch(mode) {
0704     case XFRM_MODE_TRANSPORT:
0705         return IPSEC_MODE_TRANSPORT;
0706     case XFRM_MODE_TUNNEL:
0707         return IPSEC_MODE_TUNNEL;
0708     case XFRM_MODE_BEET:
0709         return IPSEC_MODE_BEET;
0710     default:
0711         return -1;
0712     }
0713 }
0714
0715 static inline int pfkey_mode_to_xfrm(int mode)
0716 {
0717     switch(mode) {
0718     case IPSEC_MODE_ANY:    /*XXX*/
0719     case IPSEC_MODE_TRANSPORT:
0720         return XFRM_MODE_TRANSPORT;
0721     case IPSEC_MODE_TUNNEL:
0722         return XFRM_MODE_TUNNEL;
0723     case IPSEC_MODE_BEET:
0724         return XFRM_MODE_BEET;
0725     default:
0726         return -1;
0727     }
0728 }
0729
0730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
0731                     struct sockaddr *sa,
0732                     unsigned short family)
0733 {
0734     switch (family) {
0735     case AF_INET:
0736         {
0737         struct sockaddr_in *sin = (struct sockaddr_in *)sa;
0738         sin->sin_family = AF_INET;
0739         sin->sin_port = port;
0740         sin->sin_addr.s_addr = xaddr->a4;
0741         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
0742         return 32;
0743         }
0744 #if IS_ENABLED(CONFIG_IPV6)
0745     case AF_INET6:
0746         {
0747         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
0748         sin6->sin6_family = AF_INET6;
0749         sin6->sin6_port = port;
0750         sin6->sin6_flowinfo = 0;
0751         sin6->sin6_addr = xaddr->in6;
0752         sin6->sin6_scope_id = 0;
0753         return 128;
0754         }
0755 #endif
0756     }
0757     return 0;
0758 }
0759
0760 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
0761                           int add_keys, int hsc)
0762 {
0763     struct sk_buff *skb;
0764     struct sadb_msg *hdr;
0765     struct sadb_sa *sa;
0766     struct sadb_lifetime *lifetime;
0767     struct sadb_address *addr;
0768     struct sadb_key *key;
0769     struct sadb_x_sa2 *sa2;
0770     struct sadb_x_sec_ctx *sec_ctx;
0771     struct xfrm_sec_ctx *xfrm_ctx;
0772     int ctx_size = 0;
0773     int size;
0774     int auth_key_size = 0;
0775     int encrypt_key_size = 0;
0776     int sockaddr_size;
0777     struct xfrm_encap_tmpl *natt = NULL;
0778     int mode;
0779
0780     /* address family check */
0781     sockaddr_size = pfkey_sockaddr_size(x->props.family);
0782     if (!sockaddr_size)
0783         return ERR_PTR(-EINVAL);
0784
0785     /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
0786        key(AE), (identity(SD),) (sensitivity)> */
0787     size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
0788         sizeof(struct sadb_lifetime) +
0789         ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
0790         ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
0791             sizeof(struct sadb_address)*2 +
0792                 sockaddr_size*2 +
0793                     sizeof(struct sadb_x_sa2);
0794
0795     if ((xfrm_ctx = x->security)) {
0796         ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
0797         size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
0798     }
0799
0800     /* identity & sensitivity */
0801     if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
0802         size += sizeof(struct sadb_address) + sockaddr_size;
0803
0804     if (add_keys) {
0805         if (x->aalg && x->aalg->alg_key_len) {
0806             auth_key_size =
0807                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
0808             size += sizeof(struct sadb_key) + auth_key_size;
0809         }
0810         if (x->ealg && x->ealg->alg_key_len) {
0811             encrypt_key_size =
0812                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
0813             size += sizeof(struct sadb_key) + encrypt_key_size;
0814         }
0815     }
0816     if (x->encap)
0817         natt = x->encap;
0818
0819     if (natt && natt->encap_type) {
0820         size += sizeof(struct sadb_x_nat_t_type);
0821         size += sizeof(struct sadb_x_nat_t_port);
0822         size += sizeof(struct sadb_x_nat_t_port);
0823     }
0824
0825     skb =  alloc_skb(size + 16, GFP_ATOMIC);
0826     if (skb == NULL)
0827         return ERR_PTR(-ENOBUFS);
0828
0829     /* call should fill header later */
0830     hdr = skb_put(skb, sizeof(struct sadb_msg));
0831     memset(hdr, 0, size);   /* XXX do we need this ? */
0832     hdr->sadb_msg_len = size / sizeof(uint64_t);
0833
0834     /* sa */
0835     sa = skb_put(skb, sizeof(struct sadb_sa));
0836     sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
0837     sa->sadb_sa_exttype = SADB_EXT_SA;
0838     sa->sadb_sa_spi = x->id.spi;
0839     sa->sadb_sa_replay = x->props.replay_window;
0840     switch (x->km.state) {
0841     case XFRM_STATE_VALID:
0842         sa->sadb_sa_state = x->km.dying ?
0843             SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
0844         break;
0845     case XFRM_STATE_ACQ:
0846         sa->sadb_sa_state = SADB_SASTATE_LARVAL;
0847         break;
0848     default:
0849         sa->sadb_sa_state = SADB_SASTATE_DEAD;
0850         break;
0851     }
0852     sa->sadb_sa_auth = 0;
0853     if (x->aalg) {
0854         struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
0855         sa->sadb_sa_auth = (a && a->pfkey_supported) ?
0856                     a->desc.sadb_alg_id : 0;
0857     }
0858     sa->sadb_sa_encrypt = 0;
0859     BUG_ON(x->ealg && x->calg);
0860     if (x->ealg) {
0861         struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
0862         sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
0863                     a->desc.sadb_alg_id : 0;
0864     }
0865     /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
0866     if (x->calg) {
0867         struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
0868         sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
0869                     a->desc.sadb_alg_id : 0;
0870     }
0871
0872     sa->sadb_sa_flags = 0;
0873     if (x->props.flags & XFRM_STATE_NOECN)
0874         sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
0875     if (x->props.flags & XFRM_STATE_DECAP_DSCP)
0876         sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
0877     if (x->props.flags & XFRM_STATE_NOPMTUDISC)
0878         sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
0879
0880     /* hard time */
0881     if (hsc & 2) {
0882         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
0883         lifetime->sadb_lifetime_len =
0884             sizeof(struct sadb_lifetime)/sizeof(uint64_t);
0885         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
0886         lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
0887         lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
0888         lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
0889         lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
0890     }
0891     /* soft time */
0892     if (hsc & 1) {
0893         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
0894         lifetime->sadb_lifetime_len =
0895             sizeof(struct sadb_lifetime)/sizeof(uint64_t);
0896         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
0897         lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
0898         lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
0899         lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
0900         lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
0901     }
0902     /* current time */
0903     lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
0904     lifetime->sadb_lifetime_len =
0905         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
0906     lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
0907     lifetime->sadb_lifetime_allocations = x->curlft.packets;
0908     lifetime->sadb_lifetime_bytes = x->curlft.bytes;
0909     lifetime->sadb_lifetime_addtime = x->curlft.add_time;
0910     lifetime->sadb_lifetime_usetime = x->curlft.use_time;
0911     /* src address */
0912     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
0913     addr->sadb_address_len =
0914         (sizeof(struct sadb_address)+sockaddr_size)/
0915             sizeof(uint64_t);
0916     addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
0917     /* "if the ports are non-zero, then the sadb_address_proto field,
0918        normally zero, MUST be filled in with the transport
0919        protocol's number." - RFC2367 */
0920     addr->sadb_address_proto = 0;
0921     addr->sadb_address_reserved = 0;
0922
0923     addr->sadb_address_prefixlen =
0924         pfkey_sockaddr_fill(&x->props.saddr, 0,
0925                     (struct sockaddr *) (addr + 1),
0926                     x->props.family);
0927     BUG_ON(!addr->sadb_address_prefixlen);
0928
0929     /* dst address */
0930     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
0931     addr->sadb_address_len =
0932         (sizeof(struct sadb_address)+sockaddr_size)/
0933             sizeof(uint64_t);
0934     addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
0935     addr->sadb_address_proto = 0;
0936     addr->sadb_address_reserved = 0;
0937
0938     addr->sadb_address_prefixlen =
0939         pfkey_sockaddr_fill(&x->id.daddr, 0,
0940                     (struct sockaddr *) (addr + 1),
0941                     x->props.family);
0942     BUG_ON(!addr->sadb_address_prefixlen);
0943
0944     if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
0945                  x->props.family)) {
0946         addr = skb_put(skb,
0947                    sizeof(struct sadb_address) + sockaddr_size);
0948         addr->sadb_address_len =
0949             (sizeof(struct sadb_address)+sockaddr_size)/
0950             sizeof(uint64_t);
0951         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
0952         addr->sadb_address_proto =
0953             pfkey_proto_from_xfrm(x->sel.proto);
0954         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
0955         addr->sadb_address_reserved = 0;
0956
0957         pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
0958                     (struct sockaddr *) (addr + 1),
0959                     x->props.family);
0960     }
0961
0962     /* auth key */
0963     if (add_keys && auth_key_size) {
0964         key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
0965         key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
0966             sizeof(uint64_t);
0967         key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
0968         key->sadb_key_bits = x->aalg->alg_key_len;
0969         key->sadb_key_reserved = 0;
0970         memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
0971     }
0972     /* encrypt key */
0973     if (add_keys && encrypt_key_size) {
0974         key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
0975         key->sadb_key_len = (sizeof(struct sadb_key) +
0976                      encrypt_key_size) / sizeof(uint64_t);
0977         key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
0978         key->sadb_key_bits = x->ealg->alg_key_len;
0979         key->sadb_key_reserved = 0;
0980         memcpy(key + 1, x->ealg->alg_key,
0981                (x->ealg->alg_key_len+7)/8);
0982     }
0983
0984     /* sa */
0985     sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
0986     sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
0987     sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
0988     if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
0989         kfree_skb(skb);
0990         return ERR_PTR(-EINVAL);
0991     }
0992     sa2->sadb_x_sa2_mode = mode;
0993     sa2->sadb_x_sa2_reserved1 = 0;
0994     sa2->sadb_x_sa2_reserved2 = 0;
0995     sa2->sadb_x_sa2_sequence = 0;
0996     sa2->sadb_x_sa2_reqid = x->props.reqid;
0997
0998     if (natt && natt->encap_type) {
0999         struct sadb_x_nat_t_type *n_type;
1000         struct sadb_x_nat_t_port *n_port;
1001
1002         /* type */
1003         n_type = skb_put(skb, sizeof(*n_type));
1004         n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1005         n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1006         n_type->sadb_x_nat_t_type_type = natt->encap_type;
1007         n_type->sadb_x_nat_t_type_reserved[0] = 0;
1008         n_type->sadb_x_nat_t_type_reserved[1] = 0;
1009         n_type->sadb_x_nat_t_type_reserved[2] = 0;
1010
1011         /* source port */
1012         n_port = skb_put(skb, sizeof(*n_port));
1013         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1014         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1015         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1016         n_port->sadb_x_nat_t_port_reserved = 0;
1017
1018         /* dest port */
1019         n_port = skb_put(skb, sizeof(*n_port));
1020         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1021         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1022         n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1023         n_port->sadb_x_nat_t_port_reserved = 0;
1024     }
1025
1026     /* security context */
1027     if (xfrm_ctx) {
1028         sec_ctx = skb_put(skb,
1029                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1030         sec_ctx->sadb_x_sec_len =
1031           (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1032         sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1033         sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1034         sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1035         sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1036         memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1037                xfrm_ctx->ctx_len);
1038     }
1039
1040     return skb;
1041 }
1042
1043
1044 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1045 {
1046     struct sk_buff *skb;
1047
1048     skb = __pfkey_xfrm_state2msg(x, 1, 3);
1049
1050     return skb;
1051 }
1052
1053 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1054                               int hsc)
1055 {
1056     return __pfkey_xfrm_state2msg(x, 0, hsc);
1057 }
1058
1059 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1060                         const struct sadb_msg *hdr,
1061                         void * const *ext_hdrs)
1062 {
1063     struct xfrm_state *x;
1064     const struct sadb_lifetime *lifetime;
1065     const struct sadb_sa *sa;
1066     const struct sadb_key *key;
1067     const struct sadb_x_sec_ctx *sec_ctx;
1068     uint16_t proto;
1069     int err;
1070
1071
1072     sa = ext_hdrs[SADB_EXT_SA - 1];
1073     if (!sa ||
1074         !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076         return ERR_PTR(-EINVAL);
1077     if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078         !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079         return ERR_PTR(-EINVAL);
1080     if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081         !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082         return ERR_PTR(-EINVAL);
1083     if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084         !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085         return ERR_PTR(-EINVAL);
1086
1087     proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088     if (proto == 0)
1089         return ERR_PTR(-EINVAL);
1090
1091     /* default error is no buffer space */
1092     err = -ENOBUFS;
1093
1094     /* RFC2367:
1095
1096    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1097    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1098    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1099    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1100    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1101    not true.
1102
1103        However, KAME setkey always uses SADB_SASTATE_LARVAL.
1104        Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1105      */
1106     if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1107         (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1108          sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1109         sa->sadb_sa_encrypt > SADB_EALG_MAX)
1110         return ERR_PTR(-EINVAL);
1111     key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1112     if (key != NULL &&
1113         sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1114         key->sadb_key_bits == 0)
1115         return ERR_PTR(-EINVAL);
1116     key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1117     if (key != NULL &&
1118         sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1119         key->sadb_key_bits == 0)
1120         return ERR_PTR(-EINVAL);
1121
1122     x = xfrm_state_alloc(net);
1123     if (x == NULL)
1124         return ERR_PTR(-ENOBUFS);
1125
1126     x->id.proto = proto;
1127     x->id.spi = sa->sadb_sa_spi;
1128     x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1129                     (sizeof(x->replay.bitmap) * 8));
1130     if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1131         x->props.flags |= XFRM_STATE_NOECN;
1132     if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1133         x->props.flags |= XFRM_STATE_DECAP_DSCP;
1134     if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1135         x->props.flags |= XFRM_STATE_NOPMTUDISC;
1136
1137     lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1138     if (lifetime != NULL) {
1139         x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1140         x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1141         x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1142         x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1143     }
1144     lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1145     if (lifetime != NULL) {
1146         x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1147         x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1148         x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1149         x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1150     }
1151
1152     sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1153     if (sec_ctx != NULL) {
1154         struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1155
1156         if (!uctx)
1157             goto out;
1158
1159         err = security_xfrm_state_alloc(x, uctx);
1160         kfree(uctx);
1161
1162         if (err)
1163             goto out;
1164     }
1165
1166     err = -ENOBUFS;
1167     key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1168     if (sa->sadb_sa_auth) {
1169         int keysize = 0;
1170         struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1171         if (!a || !a->pfkey_supported) {
1172             err = -ENOSYS;
1173             goto out;
1174         }
1175         if (key)
1176             keysize = (key->sadb_key_bits + 7) / 8;
1177         x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1178         if (!x->aalg) {
1179             err = -ENOMEM;
1180             goto out;
1181         }
1182         strcpy(x->aalg->alg_name, a->name);
1183         x->aalg->alg_key_len = 0;
1184         if (key) {
1185             x->aalg->alg_key_len = key->sadb_key_bits;
1186             memcpy(x->aalg->alg_key, key+1, keysize);
1187         }
1188         x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1189         x->props.aalgo = sa->sadb_sa_auth;
1190         /* x->algo.flags = sa->sadb_sa_flags; */
1191     }
1192     if (sa->sadb_sa_encrypt) {
1193         if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1194             struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1195             if (!a || !a->pfkey_supported) {
1196                 err = -ENOSYS;
1197                 goto out;
1198             }
1199             x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1200             if (!x->calg) {
1201                 err = -ENOMEM;
1202                 goto out;
1203             }
1204             strcpy(x->calg->alg_name, a->name);
1205             x->props.calgo = sa->sadb_sa_encrypt;
1206         } else {
1207             int keysize = 0;
1208             struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1209             if (!a || !a->pfkey_supported) {
1210                 err = -ENOSYS;
1211                 goto out;
1212             }
1213             key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1214             if (key)
1215                 keysize = (key->sadb_key_bits + 7) / 8;
1216             x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1217             if (!x->ealg) {
1218                 err = -ENOMEM;
1219                 goto out;
1220             }
1221             strcpy(x->ealg->alg_name, a->name);
1222             x->ealg->alg_key_len = 0;
1223             if (key) {
1224                 x->ealg->alg_key_len = key->sadb_key_bits;
1225                 memcpy(x->ealg->alg_key, key+1, keysize);
1226             }
1227             x->props.ealgo = sa->sadb_sa_encrypt;
1228             x->geniv = a->uinfo.encr.geniv;
1229         }
1230     }
1231     /* x->algo.flags = sa->sadb_sa_flags; */
1232
1233     x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1234                             &x->props.saddr);
1235     pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1236                   &x->id.daddr);
1237
1238     if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1239         const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1240         int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241         if (mode < 0) {
1242             err = -EINVAL;
1243             goto out;
1244         }
1245         x->props.mode = mode;
1246         x->props.reqid = sa2->sadb_x_sa2_reqid;
1247     }
1248
1249     if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1250         const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1251
1252         /* Nobody uses this, but we try. */
1253         x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254         x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255     }
1256
1257     if (!x->sel.family)
1258         x->sel.family = x->props.family;
1259
1260     if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1261         const struct sadb_x_nat_t_type* n_type;
1262         struct xfrm_encap_tmpl *natt;
1263
1264         x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1265         if (!x->encap) {
1266             err = -ENOMEM;
1267             goto out;
1268         }
1269
1270         natt = x->encap;
1271         n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1272         natt->encap_type = n_type->sadb_x_nat_t_type_type;
1273
1274         if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1275             const struct sadb_x_nat_t_port *n_port =
1276                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1277             natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1278         }
1279         if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1280             const struct sadb_x_nat_t_port *n_port =
1281                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282             natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283         }
1284         memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1285     }
1286
1287     err = xfrm_init_state(x);
1288     if (err)
1289         goto out;
1290
1291     x->km.seq = hdr->sadb_msg_seq;
1292     return x;
1293
1294 out:
1295     x->km.state = XFRM_STATE_DEAD;
1296     xfrm_state_put(x);
1297     return ERR_PTR(err);
1298 }
1299
1300 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1301 {
1302     return -EOPNOTSUPP;
1303 }
1304
1305 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1306 {
1307     struct net *net = sock_net(sk);
1308     struct sk_buff *resp_skb;
1309     struct sadb_x_sa2 *sa2;
1310     struct sadb_address *saddr, *daddr;
1311     struct sadb_msg *out_hdr;
1312     struct sadb_spirange *range;
1313     struct xfrm_state *x = NULL;
1314     int mode;
1315     int err;
1316     u32 min_spi, max_spi;
1317     u32 reqid;
1318     u8 proto;
1319     unsigned short family;
1320     xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1321
1322     if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1323                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1324         return -EINVAL;
1325
1326     proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1327     if (proto == 0)
1328         return -EINVAL;
1329
1330     if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1331         mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1332         if (mode < 0)
1333             return -EINVAL;
1334         reqid = sa2->sadb_x_sa2_reqid;
1335     } else {
1336         mode = 0;
1337         reqid = 0;
1338     }
1339
1340     saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1341     daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1342
1343     family = ((struct sockaddr *)(saddr + 1))->sa_family;
1344     switch (family) {
1345     case AF_INET:
1346         xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1347         xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1348         break;
1349 #if IS_ENABLED(CONFIG_IPV6)
1350     case AF_INET6:
1351         xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1352         xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1353         break;
1354 #endif
1355     }
1356
1357     if (hdr->sadb_msg_seq) {
1358         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1359         if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1360             xfrm_state_put(x);
1361             x = NULL;
1362         }
1363     }
1364
1365     if (!x)
1366         x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1367
1368     if (x == NULL)
1369         return -ENOENT;
1370
1371     min_spi = 0x100;
1372     max_spi = 0x0fffffff;
1373
1374     range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1375     if (range) {
1376         min_spi = range->sadb_spirange_min;
1377         max_spi = range->sadb_spirange_max;
1378     }
1379
1380     err = verify_spi_info(x->id.proto, min_spi, max_spi);
1381     if (err) {
1382         xfrm_state_put(x);
1383         return err;
1384     }
1385
1386     err = xfrm_alloc_spi(x, min_spi, max_spi);
1387     resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1388
1389     if (IS_ERR(resp_skb)) {
1390         xfrm_state_put(x);
1391         return  PTR_ERR(resp_skb);
1392     }
1393
1394     out_hdr = (struct sadb_msg *) resp_skb->data;
1395     out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1396     out_hdr->sadb_msg_type = SADB_GETSPI;
1397     out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1398     out_hdr->sadb_msg_errno = 0;
1399     out_hdr->sadb_msg_reserved = 0;
1400     out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1401     out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1402
1403     xfrm_state_put(x);
1404
1405     pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1406
1407     return 0;
1408 }
1409
1410 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1411 {
1412     struct net *net = sock_net(sk);
1413     struct xfrm_state *x;
1414
1415     if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1416         return -EOPNOTSUPP;
1417
1418     if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1419         return 0;
1420
1421     x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1422     if (x == NULL)
1423         return 0;
1424
1425     spin_lock_bh(&x->lock);
1426     if (x->km.state == XFRM_STATE_ACQ)
1427         x->km.state = XFRM_STATE_ERROR;
1428
1429     spin_unlock_bh(&x->lock);
1430     xfrm_state_put(x);
1431     return 0;
1432 }
1433
1434 static inline int event2poltype(int event)
1435 {
1436     switch (event) {
1437     case XFRM_MSG_DELPOLICY:
1438         return SADB_X_SPDDELETE;
1439     case XFRM_MSG_NEWPOLICY:
1440         return SADB_X_SPDADD;
1441     case XFRM_MSG_UPDPOLICY:
1442         return SADB_X_SPDUPDATE;
1443     case XFRM_MSG_POLEXPIRE:
1444     //  return SADB_X_SPDEXPIRE;
1445     default:
1446         pr_err("pfkey: Unknown policy event %d\n", event);
1447         break;
1448     }
1449
1450     return 0;
1451 }
1452
1453 static inline int event2keytype(int event)
1454 {
1455     switch (event) {
1456     case XFRM_MSG_DELSA:
1457         return SADB_DELETE;
1458     case XFRM_MSG_NEWSA:
1459         return SADB_ADD;
1460     case XFRM_MSG_UPDSA:
1461         return SADB_UPDATE;
1462     case XFRM_MSG_EXPIRE:
1463         return SADB_EXPIRE;
1464     default:
1465         pr_err("pfkey: Unknown SA event %d\n", event);
1466         break;
1467     }
1468
1469     return 0;
1470 }
1471
1472 /* ADD/UPD/DEL */
1473 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1474 {
1475     struct sk_buff *skb;
1476     struct sadb_msg *hdr;
1477
1478     skb = pfkey_xfrm_state2msg(x);
1479
1480     if (IS_ERR(skb))
1481         return PTR_ERR(skb);
1482
1483     hdr = (struct sadb_msg *) skb->data;
1484     hdr->sadb_msg_version = PF_KEY_V2;
1485     hdr->sadb_msg_type = event2keytype(c->event);
1486     hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1487     hdr->sadb_msg_errno = 0;
1488     hdr->sadb_msg_reserved = 0;
1489     hdr->sadb_msg_seq = c->seq;
1490     hdr->sadb_msg_pid = c->portid;
1491
1492     pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1493
1494     return 0;
1495 }
1496
1497 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499     struct net *net = sock_net(sk);
1500     struct xfrm_state *x;
1501     int err;
1502     struct km_event c;
1503
1504     x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1505     if (IS_ERR(x))
1506         return PTR_ERR(x);
1507
1508     xfrm_state_hold(x);
1509     if (hdr->sadb_msg_type == SADB_ADD)
1510         err = xfrm_state_add(x);
1511     else
1512         err = xfrm_state_update(x);
1513
1514     xfrm_audit_state_add(x, err ? 0 : 1, true);
1515
1516     if (err < 0) {
1517         x->km.state = XFRM_STATE_DEAD;
1518         __xfrm_state_put(x);
1519         goto out;
1520     }
1521
1522     if (hdr->sadb_msg_type == SADB_ADD)
1523         c.event = XFRM_MSG_NEWSA;
1524     else
1525         c.event = XFRM_MSG_UPDSA;
1526     c.seq = hdr->sadb_msg_seq;
1527     c.portid = hdr->sadb_msg_pid;
1528     km_state_notify(x, &c);
1529 out:
1530     xfrm_state_put(x);
1531     return err;
1532 }
1533
1534 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1535 {
1536     struct net *net = sock_net(sk);
1537     struct xfrm_state *x;
1538     struct km_event c;
1539     int err;
1540
1541     if (!ext_hdrs[SADB_EXT_SA-1] ||
1542         !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1543                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1544         return -EINVAL;
1545
1546     x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1547     if (x == NULL)
1548         return -ESRCH;
1549
1550     if ((err = security_xfrm_state_delete(x)))
1551         goto out;
1552
1553     if (xfrm_state_kern(x)) {
1554         err = -EPERM;
1555         goto out;
1556     }
1557
1558     err = xfrm_state_delete(x);
1559
1560     if (err < 0)
1561         goto out;
1562
1563     c.seq = hdr->sadb_msg_seq;
1564     c.portid = hdr->sadb_msg_pid;
1565     c.event = XFRM_MSG_DELSA;
1566     km_state_notify(x, &c);
1567 out:
1568     xfrm_audit_state_delete(x, err ? 0 : 1, true);
1569     xfrm_state_put(x);
1570
1571     return err;
1572 }
1573
1574 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1575 {
1576     struct net *net = sock_net(sk);
1577     __u8 proto;
1578     struct sk_buff *out_skb;
1579     struct sadb_msg *out_hdr;
1580     struct xfrm_state *x;
1581
1582     if (!ext_hdrs[SADB_EXT_SA-1] ||
1583         !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1584                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1585         return -EINVAL;
1586
1587     x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1588     if (x == NULL)
1589         return -ESRCH;
1590
1591     out_skb = pfkey_xfrm_state2msg(x);
1592     proto = x->id.proto;
1593     xfrm_state_put(x);
1594     if (IS_ERR(out_skb))
1595         return  PTR_ERR(out_skb);
1596
1597     out_hdr = (struct sadb_msg *) out_skb->data;
1598     out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1599     out_hdr->sadb_msg_type = SADB_GET;
1600     out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1601     out_hdr->sadb_msg_errno = 0;
1602     out_hdr->sadb_msg_reserved = 0;
1603     out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1604     out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1605     pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1606
1607     return 0;
1608 }
1609
1610 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1611                           gfp_t allocation)
1612 {
1613     struct sk_buff *skb;
1614     struct sadb_msg *hdr;
1615     int len, auth_len, enc_len, i;
1616
1617     auth_len = xfrm_count_pfkey_auth_supported();
1618     if (auth_len) {
1619         auth_len *= sizeof(struct sadb_alg);
1620         auth_len += sizeof(struct sadb_supported);
1621     }
1622
1623     enc_len = xfrm_count_pfkey_enc_supported();
1624     if (enc_len) {
1625         enc_len *= sizeof(struct sadb_alg);
1626         enc_len += sizeof(struct sadb_supported);
1627     }
1628
1629     len = enc_len + auth_len + sizeof(struct sadb_msg);
1630
1631     skb = alloc_skb(len + 16, allocation);
1632     if (!skb)
1633         goto out_put_algs;
1634
1635     hdr = skb_put(skb, sizeof(*hdr));
1636     pfkey_hdr_dup(hdr, orig);
1637     hdr->sadb_msg_errno = 0;
1638     hdr->sadb_msg_len = len / sizeof(uint64_t);
1639
1640     if (auth_len) {
1641         struct sadb_supported *sp;
1642         struct sadb_alg *ap;
1643
1644         sp = skb_put(skb, auth_len);
1645         ap = (struct sadb_alg *) (sp + 1);
1646
1647         sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1648         sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1649
1650         for (i = 0; ; i++) {
1651             struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1652             if (!aalg)
1653                 break;
1654             if (!aalg->pfkey_supported)
1655                 continue;
1656             if (aalg->available)
1657                 *ap++ = aalg->desc;
1658         }
1659     }
1660
1661     if (enc_len) {
1662         struct sadb_supported *sp;
1663         struct sadb_alg *ap;
1664
1665         sp = skb_put(skb, enc_len);
1666         ap = (struct sadb_alg *) (sp + 1);
1667
1668         sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1669         sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1670
1671         for (i = 0; ; i++) {
1672             struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1673             if (!ealg)
1674                 break;
1675             if (!ealg->pfkey_supported)
1676                 continue;
1677             if (ealg->available)
1678                 *ap++ = ealg->desc;
1679         }
1680     }
1681
1682 out_put_algs:
1683     return skb;
1684 }
1685
1686 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1687 {
1688     struct pfkey_sock *pfk = pfkey_sk(sk);
1689     struct sk_buff *supp_skb;
1690
1691     if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1692         return -EINVAL;
1693
1694     if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1695         if (pfk->registered&(1<<hdr->sadb_msg_satype))
1696             return -EEXIST;
1697         pfk->registered |= (1<<hdr->sadb_msg_satype);
1698     }
1699
1700     mutex_lock(&pfkey_mutex);
1701     xfrm_probe_algs();
1702
1703     supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1704     mutex_unlock(&pfkey_mutex);
1705
1706     if (!supp_skb) {
1707         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1708             pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1709
1710         return -ENOBUFS;
1711     }
1712
1713     pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1714             sock_net(sk));
1715     return 0;
1716 }
1717
1718 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1719 {
1720     struct sk_buff *skb;
1721     struct sadb_msg *hdr;
1722
1723     skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1724     if (!skb)
1725         return -ENOBUFS;
1726
1727     hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1728     hdr->sadb_msg_errno = (uint8_t) 0;
1729     hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1730
1731     return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1732                    sock_net(sk));
1733 }
1734
1735 static int key_notify_sa_flush(const struct km_event *c)
1736 {
1737     struct sk_buff *skb;
1738     struct sadb_msg *hdr;
1739
1740     skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1741     if (!skb)
1742         return -ENOBUFS;
1743     hdr = skb_put(skb, sizeof(struct sadb_msg));
1744     hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1745     hdr->sadb_msg_type = SADB_FLUSH;
1746     hdr->sadb_msg_seq = c->seq;
1747     hdr->sadb_msg_pid = c->portid;
1748     hdr->sadb_msg_version = PF_KEY_V2;
1749     hdr->sadb_msg_errno = (uint8_t) 0;
1750     hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1751     hdr->sadb_msg_reserved = 0;
1752
1753     pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1754
1755     return 0;
1756 }
1757
1758 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1759 {
1760     struct net *net = sock_net(sk);
1761     unsigned int proto;
1762     struct km_event c;
1763     int err, err2;
1764
1765     proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1766     if (proto == 0)
1767         return -EINVAL;
1768
1769     err = xfrm_state_flush(net, proto, true, false);
1770     err2 = unicast_flush_resp(sk, hdr);
1771     if (err || err2) {
1772         if (err == -ESRCH) /* empty table - go quietly */
1773             err = 0;
1774         return err ? err : err2;
1775     }
1776
1777     c.data.proto = proto;
1778     c.seq = hdr->sadb_msg_seq;
1779     c.portid = hdr->sadb_msg_pid;
1780     c.event = XFRM_MSG_FLUSHSA;
1781     c.net = net;
1782     km_state_notify(NULL, &c);
1783
1784     return 0;
1785 }
1786
1787 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1788 {
1789     struct pfkey_sock *pfk = ptr;
1790     struct sk_buff *out_skb;
1791     struct sadb_msg *out_hdr;
1792
1793     if (!pfkey_can_dump(&pfk->sk))
1794         return -ENOBUFS;
1795
1796     out_skb = pfkey_xfrm_state2msg(x);
1797     if (IS_ERR(out_skb))
1798         return PTR_ERR(out_skb);
1799
1800     out_hdr = (struct sadb_msg *) out_skb->data;
1801     out_hdr->sadb_msg_version = pfk->dump.msg_version;
1802     out_hdr->sadb_msg_type = SADB_DUMP;
1803     out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1804     out_hdr->sadb_msg_errno = 0;
1805     out_hdr->sadb_msg_reserved = 0;
1806     out_hdr->sadb_msg_seq = count + 1;
1807     out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1808
1809     if (pfk->dump.skb)
1810         pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1811                 &pfk->sk, sock_net(&pfk->sk));
1812     pfk->dump.skb = out_skb;
1813
1814     return 0;
1815 }
1816
1817 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1818 {
1819     struct net *net = sock_net(&pfk->sk);
1820     return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1821 }
1822
1823 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1824 {
1825     struct net *net = sock_net(&pfk->sk);
1826
1827     xfrm_state_walk_done(&pfk->dump.u.state, net);
1828 }
1829
1830 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1831 {
1832     u8 proto;
1833     struct xfrm_address_filter *filter = NULL;
1834     struct pfkey_sock *pfk = pfkey_sk(sk);
1835
1836     mutex_lock(&pfk->dump_lock);
1837     if (pfk->dump.dump != NULL) {
1838         mutex_unlock(&pfk->dump_lock);
1839         return -EBUSY;
1840     }
1841
1842     proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1843     if (proto == 0) {
1844         mutex_unlock(&pfk->dump_lock);
1845         return -EINVAL;
1846     }
1847
1848     if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1849         struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1850
1851         if ((xfilter->sadb_x_filter_splen >=
1852             (sizeof(xfrm_address_t) << 3)) ||
1853             (xfilter->sadb_x_filter_dplen >=
1854             (sizeof(xfrm_address_t) << 3))) {
1855             mutex_unlock(&pfk->dump_lock);
1856             return -EINVAL;
1857         }
1858         filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1859         if (filter == NULL) {
1860             mutex_unlock(&pfk->dump_lock);
1861             return -ENOMEM;
1862         }
1863
1864         memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1865                sizeof(xfrm_address_t));
1866         memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1867                sizeof(xfrm_address_t));
1868         filter->family = xfilter->sadb_x_filter_family;
1869         filter->splen = xfilter->sadb_x_filter_splen;
1870         filter->dplen = xfilter->sadb_x_filter_dplen;
1871     }
1872
1873     pfk->dump.msg_version = hdr->sadb_msg_version;
1874     pfk->dump.msg_portid = hdr->sadb_msg_pid;
1875     pfk->dump.dump = pfkey_dump_sa;
1876     pfk->dump.done = pfkey_dump_sa_done;
1877     xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1878     mutex_unlock(&pfk->dump_lock);
1879
1880     return pfkey_do_dump(pfk);
1881 }
1882
1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1884 {
1885     struct pfkey_sock *pfk = pfkey_sk(sk);
1886     int satype = hdr->sadb_msg_satype;
1887     bool reset_errno = false;
1888
1889     if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1890         reset_errno = true;
1891         if (satype != 0 && satype != 1)
1892             return -EINVAL;
1893         pfk->promisc = satype;
1894     }
1895     if (reset_errno && skb_cloned(skb))
1896         skb = skb_copy(skb, GFP_KERNEL);
1897     else
1898         skb = skb_clone(skb, GFP_KERNEL);
1899
1900     if (reset_errno && skb) {
1901         struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1902         new_hdr->sadb_msg_errno = 0;
1903     }
1904
1905     pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1906     return 0;
1907 }
1908
1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1910 {
1911     int i;
1912     u32 reqid = *(u32*)ptr;
1913
1914     for (i=0; i<xp->xfrm_nr; i++) {
1915         if (xp->xfrm_vec[i].reqid == reqid)
1916             return -EEXIST;
1917     }
1918     return 0;
1919 }
1920
1921 static u32 gen_reqid(struct net *net)
1922 {
1923     struct xfrm_policy_walk walk;
1924     u32 start;
1925     int rc;
1926     static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1927
1928     start = reqid;
1929     do {
1930         ++reqid;
1931         if (reqid == 0)
1932             reqid = IPSEC_MANUAL_REQID_MAX+1;
1933         xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1934         rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1935         xfrm_policy_walk_done(&walk, net);
1936         if (rc != -EEXIST)
1937             return reqid;
1938     } while (reqid != start);
1939     return 0;
1940 }
1941
1942 static int
1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1944 {
1945     struct net *net = xp_net(xp);
1946     struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1947     int mode;
1948
1949     if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1950         return -ELOOP;
1951
1952     if (rq->sadb_x_ipsecrequest_mode == 0)
1953         return -EINVAL;
1954     if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1955         return -EINVAL;
1956
1957     t->id.proto = rq->sadb_x_ipsecrequest_proto;
1958     if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1959         return -EINVAL;
1960     t->mode = mode;
1961     if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1962         t->optional = 1;
1963     else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1964         t->reqid = rq->sadb_x_ipsecrequest_reqid;
1965         if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1966             t->reqid = 0;
1967         if (!t->reqid && !(t->reqid = gen_reqid(net)))
1968             return -ENOBUFS;
1969     }
1970
1971     /* addresses present only in tunnel mode */
1972     if (t->mode == XFRM_MODE_TUNNEL) {
1973         int err;
1974
1975         err = parse_sockaddr_pair(
1976             (struct sockaddr *)(rq + 1),
1977             rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1978             &t->saddr, &t->id.daddr, &t->encap_family);
1979         if (err)
1980             return err;
1981     } else
1982         t->encap_family = xp->family;
1983
1984     /* No way to set this via kame pfkey */
1985     t->allalgs = 1;
1986     xp->xfrm_nr++;
1987     return 0;
1988 }
1989
1990 static int
1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1992 {
1993     int err;
1994     int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1995     struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1996
1997     if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1998         return -EINVAL;
1999
2000     while (len >= sizeof(*rq)) {
2001         if (len < rq->sadb_x_ipsecrequest_len ||
2002             rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2003             return -EINVAL;
2004
2005         if ((err = parse_ipsecrequest(xp, rq)) < 0)
2006             return err;
2007         len -= rq->sadb_x_ipsecrequest_len;
2008         rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2009     }
2010     return 0;
2011 }
2012
2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2014 {
2015     struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2016
2017     if (xfrm_ctx) {
2018         int len = sizeof(struct sadb_x_sec_ctx);
2019         len += xfrm_ctx->ctx_len;
2020         return PFKEY_ALIGN8(len);
2021     }
2022     return 0;
2023 }
2024
2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2026 {
2027     const struct xfrm_tmpl *t;
2028     int sockaddr_size = pfkey_sockaddr_size(xp->family);
2029     int socklen = 0;
2030     int i;
2031
2032     for (i=0; i<xp->xfrm_nr; i++) {
2033         t = xp->xfrm_vec + i;
2034         socklen += pfkey_sockaddr_len(t->encap_family);
2035     }
2036
2037     return sizeof(struct sadb_msg) +
2038         (sizeof(struct sadb_lifetime) * 3) +
2039         (sizeof(struct sadb_address) * 2) +
2040         (sockaddr_size * 2) +
2041         sizeof(struct sadb_x_policy) +
2042         (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2043         (socklen * 2) +
2044         pfkey_xfrm_policy2sec_ctx_size(xp);
2045 }
2046
2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2048 {
2049     struct sk_buff *skb;
2050     int size;
2051
2052     size = pfkey_xfrm_policy2msg_size(xp);
2053
2054     skb =  alloc_skb(size + 16, GFP_ATOMIC);
2055     if (skb == NULL)
2056         return ERR_PTR(-ENOBUFS);
2057
2058     return skb;
2059 }
2060
2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2062 {
2063     struct sadb_msg *hdr;
2064     struct sadb_address *addr;
2065     struct sadb_lifetime *lifetime;
2066     struct sadb_x_policy *pol;
2067     struct sadb_x_sec_ctx *sec_ctx;
2068     struct xfrm_sec_ctx *xfrm_ctx;
2069     int i;
2070     int size;
2071     int sockaddr_size = pfkey_sockaddr_size(xp->family);
2072     int socklen = pfkey_sockaddr_len(xp->family);
2073
2074     size = pfkey_xfrm_policy2msg_size(xp);
2075
2076     /* call should fill header later */
2077     hdr = skb_put(skb, sizeof(struct sadb_msg));
2078     memset(hdr, 0, size);   /* XXX do we need this ? */
2079
2080     /* src address */
2081     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2082     addr->sadb_address_len =
2083         (sizeof(struct sadb_address)+sockaddr_size)/
2084             sizeof(uint64_t);
2085     addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2086     addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2087     addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2088     addr->sadb_address_reserved = 0;
2089     if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2090                  xp->selector.sport,
2091                  (struct sockaddr *) (addr + 1),
2092                  xp->family))
2093         BUG();
2094
2095     /* dst address */
2096     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2097     addr->sadb_address_len =
2098         (sizeof(struct sadb_address)+sockaddr_size)/
2099             sizeof(uint64_t);
2100     addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2101     addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2102     addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2103     addr->sadb_address_reserved = 0;
2104
2105     pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2106                 (struct sockaddr *) (addr + 1),
2107                 xp->family);
2108
2109     /* hard time */
2110     lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2111     lifetime->sadb_lifetime_len =
2112         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2113     lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2114     lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2115     lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2116     lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2117     lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2118     /* soft time */
2119     lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2120     lifetime->sadb_lifetime_len =
2121         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2122     lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2123     lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2124     lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2125     lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2126     lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2127     /* current time */
2128     lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2129     lifetime->sadb_lifetime_len =
2130         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2131     lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2132     lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2133     lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2134     lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2135     lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2136
2137     pol = skb_put(skb, sizeof(struct sadb_x_policy));
2138     pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2139     pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2140     pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2141     if (xp->action == XFRM_POLICY_ALLOW) {
2142         if (xp->xfrm_nr)
2143             pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2144         else
2145             pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2146     }
2147     pol->sadb_x_policy_dir = dir+1;
2148     pol->sadb_x_policy_reserved = 0;
2149     pol->sadb_x_policy_id = xp->index;
2150     pol->sadb_x_policy_priority = xp->priority;
2151
2152     for (i=0; i<xp->xfrm_nr; i++) {
2153         const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2154         struct sadb_x_ipsecrequest *rq;
2155         int req_size;
2156         int mode;
2157
2158         req_size = sizeof(struct sadb_x_ipsecrequest);
2159         if (t->mode == XFRM_MODE_TUNNEL) {
2160             socklen = pfkey_sockaddr_len(t->encap_family);
2161             req_size += socklen * 2;
2162         } else {
2163             size -= 2*socklen;
2164         }
2165         rq = skb_put(skb, req_size);
2166         pol->sadb_x_policy_len += req_size/8;
2167         memset(rq, 0, sizeof(*rq));
2168         rq->sadb_x_ipsecrequest_len = req_size;
2169         rq->sadb_x_ipsecrequest_proto = t->id.proto;
2170         if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2171             return -EINVAL;
2172         rq->sadb_x_ipsecrequest_mode = mode;
2173         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2174         if (t->reqid)
2175             rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2176         if (t->optional)
2177             rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2178         rq->sadb_x_ipsecrequest_reqid = t->reqid;
2179
2180         if (t->mode == XFRM_MODE_TUNNEL) {
2181             u8 *sa = (void *)(rq + 1);
2182             pfkey_sockaddr_fill(&t->saddr, 0,
2183                         (struct sockaddr *)sa,
2184                         t->encap_family);
2185             pfkey_sockaddr_fill(&t->id.daddr, 0,
2186                         (struct sockaddr *) (sa + socklen),
2187                         t->encap_family);
2188         }
2189     }
2190
2191     /* security context */
2192     if ((xfrm_ctx = xp->security)) {
2193         int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2194
2195         sec_ctx = skb_put(skb, ctx_size);
2196         sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2197         sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2198         sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2199         sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2200         sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2201         memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2202                xfrm_ctx->ctx_len);
2203     }
2204
2205     hdr->sadb_msg_len = size / sizeof(uint64_t);
2206     hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2207
2208     return 0;
2209 }
2210
2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2212 {
2213     struct sk_buff *out_skb;
2214     struct sadb_msg *out_hdr;
2215     int err;
2216
2217     out_skb = pfkey_xfrm_policy2msg_prep(xp);
2218     if (IS_ERR(out_skb))
2219         return PTR_ERR(out_skb);
2220
2221     err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2222     if (err < 0) {
2223         kfree_skb(out_skb);
2224         return err;
2225     }
2226
2227     out_hdr = (struct sadb_msg *) out_skb->data;
2228     out_hdr->sadb_msg_version = PF_KEY_V2;
2229
2230     if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2231         out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2232     else
2233         out_hdr->sadb_msg_type = event2poltype(c->event);
2234     out_hdr->sadb_msg_errno = 0;
2235     out_hdr->sadb_msg_seq = c->seq;
2236     out_hdr->sadb_msg_pid = c->portid;
2237     pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2238     return 0;
2239
2240 }
2241
2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2243 {
2244     struct net *net = sock_net(sk);
2245     int err = 0;
2246     struct sadb_lifetime *lifetime;
2247     struct sadb_address *sa;
2248     struct sadb_x_policy *pol;
2249     struct xfrm_policy *xp;
2250     struct km_event c;
2251     struct sadb_x_sec_ctx *sec_ctx;
2252
2253     if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2254                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2255         !ext_hdrs[SADB_X_EXT_POLICY-1])
2256         return -EINVAL;
2257
2258     pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2259     if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2260         return -EINVAL;
2261     if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2262         return -EINVAL;
2263
2264     xp = xfrm_policy_alloc(net, GFP_KERNEL);
2265     if (xp == NULL)
2266         return -ENOBUFS;
2267
2268     xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2269               XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2270     xp->priority = pol->sadb_x_policy_priority;
2271
2272     sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2273     xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2274     xp->selector.family = xp->family;
2275     xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2276     xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2277     xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2278     if (xp->selector.sport)
2279         xp->selector.sport_mask = htons(0xffff);
2280
2281     sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2282     pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2283     xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2284
2285     /* Amusing, we set this twice.  KAME apps appear to set same value
2286      * in both addresses.
2287      */
2288     xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2289
2290     xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2291     if (xp->selector.dport)
2292         xp->selector.dport_mask = htons(0xffff);
2293
2294     sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2295     if (sec_ctx != NULL) {
2296         struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2297
2298         if (!uctx) {
2299             err = -ENOBUFS;
2300             goto out;
2301         }
2302
2303         err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2304         kfree(uctx);
2305
2306         if (err)
2307             goto out;
2308     }
2309
2310     xp->lft.soft_byte_limit = XFRM_INF;
2311     xp->lft.hard_byte_limit = XFRM_INF;
2312     xp->lft.soft_packet_limit = XFRM_INF;
2313     xp->lft.hard_packet_limit = XFRM_INF;
2314     if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2315         xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2316         xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2317         xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2318         xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2319     }
2320     if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2321         xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2322         xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2323         xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2324         xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2325     }
2326     xp->xfrm_nr = 0;
2327     if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2328         (err = parse_ipsecrequests(xp, pol)) < 0)
2329         goto out;
2330
2331     err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2332                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2333
2334     xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2335
2336     if (err)
2337         goto out;
2338
2339     if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2340         c.event = XFRM_MSG_UPDPOLICY;
2341     else
2342         c.event = XFRM_MSG_NEWPOLICY;
2343
2344     c.seq = hdr->sadb_msg_seq;
2345     c.portid = hdr->sadb_msg_pid;
2346
2347     km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2348     xfrm_pol_put(xp);
2349     return 0;
2350
2351 out:
2352     xp->walk.dead = 1;
2353     xfrm_policy_destroy(xp);
2354     return err;
2355 }
2356
2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2358 {
2359     struct net *net = sock_net(sk);
2360     int err;
2361     struct sadb_address *sa;
2362     struct sadb_x_policy *pol;
2363     struct xfrm_policy *xp;
2364     struct xfrm_selector sel;
2365     struct km_event c;
2366     struct sadb_x_sec_ctx *sec_ctx;
2367     struct xfrm_sec_ctx *pol_ctx = NULL;
2368
2369     if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2370                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2371         !ext_hdrs[SADB_X_EXT_POLICY-1])
2372         return -EINVAL;
2373
2374     pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2375     if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2376         return -EINVAL;
2377
2378     memset(&sel, 0, sizeof(sel));
2379
2380     sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2381     sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2382     sel.prefixlen_s = sa->sadb_address_prefixlen;
2383     sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2384     sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2385     if (sel.sport)
2386         sel.sport_mask = htons(0xffff);
2387
2388     sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2389     pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2390     sel.prefixlen_d = sa->sadb_address_prefixlen;
2391     sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392     sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393     if (sel.dport)
2394         sel.dport_mask = htons(0xffff);
2395
2396     sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2397     if (sec_ctx != NULL) {
2398         struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2399
2400         if (!uctx)
2401             return -ENOMEM;
2402
2403         err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2404         kfree(uctx);
2405         if (err)
2406             return err;
2407     }
2408
2409     xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2410                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2411                    1, &err);
2412     security_xfrm_policy_free(pol_ctx);
2413     if (xp == NULL)
2414         return -ENOENT;
2415
2416     xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2417
2418     if (err)
2419         goto out;
2420
2421     c.seq = hdr->sadb_msg_seq;
2422     c.portid = hdr->sadb_msg_pid;
2423     c.data.byid = 0;
2424     c.event = XFRM_MSG_DELPOLICY;
2425     km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2426
2427 out:
2428     xfrm_pol_put(xp);
2429     return err;
2430 }
2431
2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2433 {
2434     int err;
2435     struct sk_buff *out_skb;
2436     struct sadb_msg *out_hdr;
2437     err = 0;
2438
2439     out_skb = pfkey_xfrm_policy2msg_prep(xp);
2440     if (IS_ERR(out_skb)) {
2441         err =  PTR_ERR(out_skb);
2442         goto out;
2443     }
2444     err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2445     if (err < 0) {
2446         kfree_skb(out_skb);
2447         goto out;
2448     }
2449
2450     out_hdr = (struct sadb_msg *) out_skb->data;
2451     out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2452     out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2453     out_hdr->sadb_msg_satype = 0;
2454     out_hdr->sadb_msg_errno = 0;
2455     out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2456     out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2457     pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2458     err = 0;
2459
2460 out:
2461     return err;
2462 }
2463
2464 static int pfkey_sockaddr_pair_size(sa_family_t family)
2465 {
2466     return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2467 }
2468
2469 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2470                    xfrm_address_t *saddr, xfrm_address_t *daddr,
2471                    u16 *family)
2472 {
2473     int af, socklen;
2474
2475     if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2476         return -EINVAL;
2477
2478     af = pfkey_sockaddr_extract(sa, saddr);
2479     if (!af)
2480         return -EINVAL;
2481
2482     socklen = pfkey_sockaddr_len(af);
2483     if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2484                    daddr) != af)
2485         return -EINVAL;
2486
2487     *family = af;
2488     return 0;
2489 }
2490
2491 #ifdef CONFIG_NET_KEY_MIGRATE
2492 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2493                     struct xfrm_migrate *m)
2494 {
2495     int err;
2496     struct sadb_x_ipsecrequest *rq2;
2497     int mode;
2498
2499     if (len < sizeof(*rq1) ||
2500         len < rq1->sadb_x_ipsecrequest_len ||
2501         rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2502         return -EINVAL;
2503
2504     /* old endoints */
2505     err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2506                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2507                   &m->old_saddr, &m->old_daddr,
2508                   &m->old_family);
2509     if (err)
2510         return err;
2511
2512     rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2513     len -= rq1->sadb_x_ipsecrequest_len;
2514
2515     if (len <= sizeof(*rq2) ||
2516         len < rq2->sadb_x_ipsecrequest_len ||
2517         rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2518         return -EINVAL;
2519
2520     /* new endpoints */
2521     err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2522                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2523                   &m->new_saddr, &m->new_daddr,
2524                   &m->new_family);
2525     if (err)
2526         return err;
2527
2528     if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2529         rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2530         rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2531         return -EINVAL;
2532
2533     m->proto = rq1->sadb_x_ipsecrequest_proto;
2534     if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2535         return -EINVAL;
2536     m->mode = mode;
2537     m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2538
2539     return ((int)(rq1->sadb_x_ipsecrequest_len +
2540               rq2->sadb_x_ipsecrequest_len));
2541 }
2542
2543 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2544              const struct sadb_msg *hdr, void * const *ext_hdrs)
2545 {
2546     int i, len, ret, err = -EINVAL;
2547     u8 dir;
2548     struct sadb_address *sa;
2549     struct sadb_x_kmaddress *kma;
2550     struct sadb_x_policy *pol;
2551     struct sadb_x_ipsecrequest *rq;
2552     struct xfrm_selector sel;
2553     struct xfrm_migrate m[XFRM_MAX_DEPTH];
2554     struct xfrm_kmaddress k;
2555     struct net *net = sock_net(sk);
2556
2557     if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2558                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2559         !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2560         err = -EINVAL;
2561         goto out;
2562     }
2563
2564     kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2565     pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2566
2567     if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2568         err = -EINVAL;
2569         goto out;
2570     }
2571
2572     if (kma) {
2573         /* convert sadb_x_kmaddress to xfrm_kmaddress */
2574         k.reserved = kma->sadb_x_kmaddress_reserved;
2575         ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2576                       8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2577                       &k.local, &k.remote, &k.family);
2578         if (ret < 0) {
2579             err = ret;
2580             goto out;
2581         }
2582     }
2583
2584     dir = pol->sadb_x_policy_dir - 1;
2585     memset(&sel, 0, sizeof(sel));
2586
2587     /* set source address info of selector */
2588     sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2589     sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2590     sel.prefixlen_s = sa->sadb_address_prefixlen;
2591     sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2592     sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2593     if (sel.sport)
2594         sel.sport_mask = htons(0xffff);
2595
2596     /* set destination address info of selector */
2597     sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2598     pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2599     sel.prefixlen_d = sa->sadb_address_prefixlen;
2600     sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2601     sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2602     if (sel.dport)
2603         sel.dport_mask = htons(0xffff);
2604
2605     rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2606
2607     /* extract ipsecrequests */
2608     i = 0;
2609     len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2610
2611     while (len > 0 && i < XFRM_MAX_DEPTH) {
2612         ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2613         if (ret < 0) {
2614             err = ret;
2615             goto out;
2616         } else {
2617             rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2618             len -= ret;
2619             i++;
2620         }
2621     }
2622
2623     if (!i || len > 0) {
2624         err = -EINVAL;
2625         goto out;
2626     }
2627
2628     return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2629                 kma ? &k : NULL, net, NULL, 0);
2630
2631  out:
2632     return err;
2633 }
2634 #else
2635 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2636              const struct sadb_msg *hdr, void * const *ext_hdrs)
2637 {
2638     return -ENOPROTOOPT;
2639 }
2640 #endif
2641
2642
2643 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2644 {
2645     struct net *net = sock_net(sk);
2646     unsigned int dir;
2647     int err = 0, delete;
2648     struct sadb_x_policy *pol;
2649     struct xfrm_policy *xp;
2650     struct km_event c;
2651
2652     if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2653         return -EINVAL;
2654
2655     dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2656     if (dir >= XFRM_POLICY_MAX)
2657         return -EINVAL;
2658
2659     delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2660     xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2661                   dir, pol->sadb_x_policy_id, delete, &err);
2662     if (xp == NULL)
2663         return -ENOENT;
2664
2665     if (delete) {
2666         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2667
2668         if (err)
2669             goto out;
2670         c.seq = hdr->sadb_msg_seq;
2671         c.portid = hdr->sadb_msg_pid;
2672         c.data.byid = 1;
2673         c.event = XFRM_MSG_DELPOLICY;
2674         km_policy_notify(xp, dir, &c);
2675     } else {
2676         err = key_pol_get_resp(sk, xp, hdr, dir);
2677     }
2678
2679 out:
2680     xfrm_pol_put(xp);
2681     return err;
2682 }
2683
2684 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2685 {
2686     struct pfkey_sock *pfk = ptr;
2687     struct sk_buff *out_skb;
2688     struct sadb_msg *out_hdr;
2689     int err;
2690
2691     if (!pfkey_can_dump(&pfk->sk))
2692         return -ENOBUFS;
2693
2694     out_skb = pfkey_xfrm_policy2msg_prep(xp);
2695     if (IS_ERR(out_skb))
2696         return PTR_ERR(out_skb);
2697
2698     err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2699     if (err < 0) {
2700         kfree_skb(out_skb);
2701         return err;
2702     }
2703
2704     out_hdr = (struct sadb_msg *) out_skb->data;
2705     out_hdr->sadb_msg_version = pfk->dump.msg_version;
2706     out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2707     out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2708     out_hdr->sadb_msg_errno = 0;
2709     out_hdr->sadb_msg_seq = count + 1;
2710     out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2711
2712     if (pfk->dump.skb)
2713         pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2714                 &pfk->sk, sock_net(&pfk->sk));
2715     pfk->dump.skb = out_skb;
2716
2717     return 0;
2718 }
2719
2720 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2721 {
2722     struct net *net = sock_net(&pfk->sk);
2723     return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2724 }
2725
2726 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2727 {
2728     struct net *net = sock_net((struct sock *)pfk);
2729
2730     xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2731 }
2732
2733 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2734 {
2735     struct pfkey_sock *pfk = pfkey_sk(sk);
2736
2737     mutex_lock(&pfk->dump_lock);
2738     if (pfk->dump.dump != NULL) {
2739         mutex_unlock(&pfk->dump_lock);
2740         return -EBUSY;
2741     }
2742
2743     pfk->dump.msg_version = hdr->sadb_msg_version;
2744     pfk->dump.msg_portid = hdr->sadb_msg_pid;
2745     pfk->dump.dump = pfkey_dump_sp;
2746     pfk->dump.done = pfkey_dump_sp_done;
2747     xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2748     mutex_unlock(&pfk->dump_lock);
2749
2750     return pfkey_do_dump(pfk);
2751 }
2752
2753 static int key_notify_policy_flush(const struct km_event *c)
2754 {
2755     struct sk_buff *skb_out;
2756     struct sadb_msg *hdr;
2757
2758     skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2759     if (!skb_out)
2760         return -ENOBUFS;
2761     hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2762     hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2763     hdr->sadb_msg_seq = c->seq;
2764     hdr->sadb_msg_pid = c->portid;
2765     hdr->sadb_msg_version = PF_KEY_V2;
2766     hdr->sadb_msg_errno = (uint8_t) 0;
2767     hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2768     hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2769     hdr->sadb_msg_reserved = 0;
2770     pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2771     return 0;
2772
2773 }
2774
2775 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2776 {
2777     struct net *net = sock_net(sk);
2778     struct km_event c;
2779     int err, err2;
2780
2781     err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2782     err2 = unicast_flush_resp(sk, hdr);
2783     if (err || err2) {
2784         if (err == -ESRCH) /* empty table - old silent behavior */
2785             return 0;
2786         return err;
2787     }
2788
2789     c.data.type = XFRM_POLICY_TYPE_MAIN;
2790     c.event = XFRM_MSG_FLUSHPOLICY;
2791     c.portid = hdr->sadb_msg_pid;
2792     c.seq = hdr->sadb_msg_seq;
2793     c.net = net;
2794     km_policy_notify(NULL, 0, &c);
2795
2796     return 0;
2797 }
2798
2799 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2800                  const struct sadb_msg *hdr, void * const *ext_hdrs);
2801 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2802     [SADB_RESERVED]     = pfkey_reserved,
2803     [SADB_GETSPI]       = pfkey_getspi,
2804     [SADB_UPDATE]       = pfkey_add,
2805     [SADB_ADD]      = pfkey_add,
2806     [SADB_DELETE]       = pfkey_delete,
2807     [SADB_GET]      = pfkey_get,
2808     [SADB_ACQUIRE]      = pfkey_acquire,
2809     [SADB_REGISTER]     = pfkey_register,
2810     [SADB_EXPIRE]       = NULL,
2811     [SADB_FLUSH]        = pfkey_flush,
2812     [SADB_DUMP]     = pfkey_dump,
2813     [SADB_X_PROMISC]    = pfkey_promisc,
2814     [SADB_X_PCHANGE]    = NULL,
2815     [SADB_X_SPDUPDATE]  = pfkey_spdadd,
2816     [SADB_X_SPDADD]     = pfkey_spdadd,
2817     [SADB_X_SPDDELETE]  = pfkey_spddelete,
2818     [SADB_X_SPDGET]     = pfkey_spdget,
2819     [SADB_X_SPDACQUIRE] = NULL,
2820     [SADB_X_SPDDUMP]    = pfkey_spddump,
2821     [SADB_X_SPDFLUSH]   = pfkey_spdflush,
2822     [SADB_X_SPDSETIDX]  = pfkey_spdadd,
2823     [SADB_X_SPDDELETE2] = pfkey_spdget,
2824     [SADB_X_MIGRATE]    = pfkey_migrate,
2825 };
2826
2827 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2828 {
2829     void *ext_hdrs[SADB_EXT_MAX];
2830     int err;
2831
2832     /* Non-zero return value of pfkey_broadcast() does not always signal
2833      * an error and even on an actual error we may still want to process
2834      * the message so rather ignore the return value.
2835      */
2836     pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2837             BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2838
2839     memset(ext_hdrs, 0, sizeof(ext_hdrs));
2840     err = parse_exthdrs(skb, hdr, ext_hdrs);
2841     if (!err) {
2842         err = -EOPNOTSUPP;
2843         if (pfkey_funcs[hdr->sadb_msg_type])
2844             err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2845     }
2846     return err;
2847 }
2848
2849 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2850 {
2851     struct sadb_msg *hdr = NULL;
2852
2853     if (skb->len < sizeof(*hdr)) {
2854         *errp = -EMSGSIZE;
2855     } else {
2856         hdr = (struct sadb_msg *) skb->data;
2857         if (hdr->sadb_msg_version != PF_KEY_V2 ||
2858             hdr->sadb_msg_reserved != 0 ||
2859             (hdr->sadb_msg_type <= SADB_RESERVED ||
2860              hdr->sadb_msg_type > SADB_MAX)) {
2861             hdr = NULL;
2862             *errp = -EINVAL;
2863         } else if (hdr->sadb_msg_len != (skb->len /
2864                          sizeof(uint64_t)) ||
2865                hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2866                         sizeof(uint64_t))) {
2867             hdr = NULL;
2868             *errp = -EMSGSIZE;
2869         } else {
2870             *errp = 0;
2871         }
2872     }
2873     return hdr;
2874 }
2875
2876 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2877                 const struct xfrm_algo_desc *d)
2878 {
2879     unsigned int id = d->desc.sadb_alg_id;
2880
2881     if (id >= sizeof(t->aalgos) * 8)
2882         return 0;
2883
2884     return (t->aalgos >> id) & 1;
2885 }
2886
2887 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2888                 const struct xfrm_algo_desc *d)
2889 {
2890     unsigned int id = d->desc.sadb_alg_id;
2891
2892     if (id >= sizeof(t->ealgos) * 8)
2893         return 0;
2894
2895     return (t->ealgos >> id) & 1;
2896 }
2897
2898 static int count_ah_combs(const struct xfrm_tmpl *t)
2899 {
2900     int i, sz = 0;
2901
2902     for (i = 0; ; i++) {
2903         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2904         if (!aalg)
2905             break;
2906         if (!aalg->pfkey_supported)
2907             continue;
2908         if (aalg_tmpl_set(t, aalg) && aalg->available)
2909             sz += sizeof(struct sadb_comb);
2910     }
2911     return sz + sizeof(struct sadb_prop);
2912 }
2913
2914 static int count_esp_combs(const struct xfrm_tmpl *t)
2915 {
2916     int i, k, sz = 0;
2917
2918     for (i = 0; ; i++) {
2919         const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920         if (!ealg)
2921             break;
2922
2923         if (!ealg->pfkey_supported)
2924             continue;
2925
2926         if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927             continue;
2928
2929         for (k = 1; ; k++) {
2930             const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931             if (!aalg)
2932                 break;
2933
2934             if (!aalg->pfkey_supported)
2935                 continue;
2936
2937             if (aalg_tmpl_set(t, aalg) && aalg->available)
2938                 sz += sizeof(struct sadb_comb);
2939         }
2940     }
2941     return sz + sizeof(struct sadb_prop);
2942 }
2943
2944 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2945 {
2946     struct sadb_prop *p;
2947     int i;
2948
2949     p = skb_put(skb, sizeof(struct sadb_prop));
2950     p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2951     p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2952     p->sadb_prop_replay = 32;
2953     memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2954
2955     for (i = 0; ; i++) {
2956         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2957         if (!aalg)
2958             break;
2959
2960         if (!aalg->pfkey_supported)
2961             continue;
2962
2963         if (aalg_tmpl_set(t, aalg) && aalg->available) {
2964             struct sadb_comb *c;
2965             c = skb_put_zero(skb, sizeof(struct sadb_comb));
2966             p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2967             c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2968             c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2969             c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2970             c->sadb_comb_hard_addtime = 24*60*60;
2971             c->sadb_comb_soft_addtime = 20*60*60;
2972             c->sadb_comb_hard_usetime = 8*60*60;
2973             c->sadb_comb_soft_usetime = 7*60*60;
2974         }
2975     }
2976 }
2977
2978 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2979 {
2980     struct sadb_prop *p;
2981     int i, k;
2982
2983     p = skb_put(skb, sizeof(struct sadb_prop));
2984     p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2985     p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2986     p->sadb_prop_replay = 32;
2987     memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2988
2989     for (i=0; ; i++) {
2990         const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2991         if (!ealg)
2992             break;
2993
2994         if (!ealg->pfkey_supported)
2995             continue;
2996
2997         if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2998             continue;
2999
3000         for (k = 1; ; k++) {
3001             struct sadb_comb *c;
3002             const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3003             if (!aalg)
3004                 break;
3005             if (!aalg->pfkey_supported)
3006                 continue;
3007             if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3008                 continue;
3009             c = skb_put(skb, sizeof(struct sadb_comb));
3010             memset(c, 0, sizeof(*c));
3011             p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3012             c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3013             c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3014             c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3015             c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3016             c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3017             c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3018             c->sadb_comb_hard_addtime = 24*60*60;
3019             c->sadb_comb_soft_addtime = 20*60*60;
3020             c->sadb_comb_hard_usetime = 8*60*60;
3021             c->sadb_comb_soft_usetime = 7*60*60;
3022         }
3023     }
3024 }
3025
3026 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3027 {
3028     return 0;
3029 }
3030
3031 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3032 {
3033     struct sk_buff *out_skb;
3034     struct sadb_msg *out_hdr;
3035     int hard;
3036     int hsc;
3037
3038     hard = c->data.hard;
3039     if (hard)
3040         hsc = 2;
3041     else
3042         hsc = 1;
3043
3044     out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3045     if (IS_ERR(out_skb))
3046         return PTR_ERR(out_skb);
3047
3048     out_hdr = (struct sadb_msg *) out_skb->data;
3049     out_hdr->sadb_msg_version = PF_KEY_V2;
3050     out_hdr->sadb_msg_type = SADB_EXPIRE;
3051     out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3052     out_hdr->sadb_msg_errno = 0;
3053     out_hdr->sadb_msg_reserved = 0;
3054     out_hdr->sadb_msg_seq = 0;
3055     out_hdr->sadb_msg_pid = 0;
3056
3057     pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3058             xs_net(x));
3059     return 0;
3060 }
3061
3062 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3063 {
3064     struct net *net = x ? xs_net(x) : c->net;
3065     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3066
3067     if (atomic_read(&net_pfkey->socks_nr) == 0)
3068         return 0;
3069
3070     switch (c->event) {
3071     case XFRM_MSG_EXPIRE:
3072         return key_notify_sa_expire(x, c);
3073     case XFRM_MSG_DELSA:
3074     case XFRM_MSG_NEWSA:
3075     case XFRM_MSG_UPDSA:
3076         return key_notify_sa(x, c);
3077     case XFRM_MSG_FLUSHSA:
3078         return key_notify_sa_flush(c);
3079     case XFRM_MSG_NEWAE: /* not yet supported */
3080         break;
3081     default:
3082         pr_err("pfkey: Unknown SA event %d\n", c->event);
3083         break;
3084     }
3085
3086     return 0;
3087 }
3088
3089 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3090 {
3091     if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3092         return 0;
3093
3094     switch (c->event) {
3095     case XFRM_MSG_POLEXPIRE:
3096         return key_notify_policy_expire(xp, c);
3097     case XFRM_MSG_DELPOLICY:
3098     case XFRM_MSG_NEWPOLICY:
3099     case XFRM_MSG_UPDPOLICY:
3100         return key_notify_policy(xp, dir, c);
3101     case XFRM_MSG_FLUSHPOLICY:
3102         if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3103             break;
3104         return key_notify_policy_flush(c);
3105     default:
3106         pr_err("pfkey: Unknown policy event %d\n", c->event);
3107         break;
3108     }
3109
3110     return 0;
3111 }
3112
3113 static u32 get_acqseq(void)
3114 {
3115     u32 res;
3116     static atomic_t acqseq;
3117
3118     do {
3119         res = atomic_inc_return(&acqseq);
3120     } while (!res);
3121     return res;
3122 }
3123
3124 static bool pfkey_is_alive(const struct km_event *c)
3125 {
3126     struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3127     struct sock *sk;
3128     bool is_alive = false;
3129
3130     rcu_read_lock();
3131     sk_for_each_rcu(sk, &net_pfkey->table) {
3132         if (pfkey_sk(sk)->registered) {
3133             is_alive = true;
3134             break;
3135         }
3136     }
3137     rcu_read_unlock();
3138
3139     return is_alive;
3140 }
3141
3142 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3143 {
3144     struct sk_buff *skb;
3145     struct sadb_msg *hdr;
3146     struct sadb_address *addr;
3147     struct sadb_x_policy *pol;
3148     int sockaddr_size;
3149     int size;
3150     struct sadb_x_sec_ctx *sec_ctx;
3151     struct xfrm_sec_ctx *xfrm_ctx;
3152     int ctx_size = 0;
3153
3154     sockaddr_size = pfkey_sockaddr_size(x->props.family);
3155     if (!sockaddr_size)
3156         return -EINVAL;
3157
3158     size = sizeof(struct sadb_msg) +
3159         (sizeof(struct sadb_address) * 2) +
3160         (sockaddr_size * 2) +
3161         sizeof(struct sadb_x_policy);
3162
3163     if (x->id.proto == IPPROTO_AH)
3164         size += count_ah_combs(t);
3165     else if (x->id.proto == IPPROTO_ESP)
3166         size += count_esp_combs(t);
3167
3168     if ((xfrm_ctx = x->security)) {
3169         ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3170         size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3171     }
3172
3173     skb =  alloc_skb(size + 16, GFP_ATOMIC);
3174     if (skb == NULL)
3175         return -ENOMEM;
3176
3177     hdr = skb_put(skb, sizeof(struct sadb_msg));
3178     hdr->sadb_msg_version = PF_KEY_V2;
3179     hdr->sadb_msg_type = SADB_ACQUIRE;
3180     hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3181     hdr->sadb_msg_len = size / sizeof(uint64_t);
3182     hdr->sadb_msg_errno = 0;
3183     hdr->sadb_msg_reserved = 0;
3184     hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3185     hdr->sadb_msg_pid = 0;
3186
3187     /* src address */
3188     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3189     addr->sadb_address_len =
3190         (sizeof(struct sadb_address)+sockaddr_size)/
3191             sizeof(uint64_t);
3192     addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3193     addr->sadb_address_proto = 0;
3194     addr->sadb_address_reserved = 0;
3195     addr->sadb_address_prefixlen =
3196         pfkey_sockaddr_fill(&x->props.saddr, 0,
3197                     (struct sockaddr *) (addr + 1),
3198                     x->props.family);
3199     if (!addr->sadb_address_prefixlen)
3200         BUG();
3201
3202     /* dst address */
3203     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3204     addr->sadb_address_len =
3205         (sizeof(struct sadb_address)+sockaddr_size)/
3206             sizeof(uint64_t);
3207     addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3208     addr->sadb_address_proto = 0;
3209     addr->sadb_address_reserved = 0;
3210     addr->sadb_address_prefixlen =
3211         pfkey_sockaddr_fill(&x->id.daddr, 0,
3212                     (struct sockaddr *) (addr + 1),
3213                     x->props.family);
3214     if (!addr->sadb_address_prefixlen)
3215         BUG();
3216
3217     pol = skb_put(skb, sizeof(struct sadb_x_policy));
3218     pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3219     pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3220     pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3221     pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3222     pol->sadb_x_policy_reserved = 0;
3223     pol->sadb_x_policy_id = xp->index;
3224     pol->sadb_x_policy_priority = xp->priority;
3225
3226     /* Set sadb_comb's. */
3227     if (x->id.proto == IPPROTO_AH)
3228         dump_ah_combs(skb, t);
3229     else if (x->id.proto == IPPROTO_ESP)
3230         dump_esp_combs(skb, t);
3231
3232     /* security context */
3233     if (xfrm_ctx) {
3234         sec_ctx = skb_put(skb,
3235                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3236         sec_ctx->sadb_x_sec_len =
3237           (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3238         sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3239         sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3240         sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3241         sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3242         memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3243                xfrm_ctx->ctx_len);
3244     }
3245
3246     return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3247                    xs_net(x));
3248 }
3249
3250 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3251                         u8 *data, int len, int *dir)
3252 {
3253     struct net *net = sock_net(sk);
3254     struct xfrm_policy *xp;
3255     struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3256     struct sadb_x_sec_ctx *sec_ctx;
3257
3258     switch (sk->sk_family) {
3259     case AF_INET:
3260         if (opt != IP_IPSEC_POLICY) {
3261             *dir = -EOPNOTSUPP;
3262             return NULL;
3263         }
3264         break;
3265 #if IS_ENABLED(CONFIG_IPV6)
3266     case AF_INET6:
3267         if (opt != IPV6_IPSEC_POLICY) {
3268             *dir = -EOPNOTSUPP;
3269             return NULL;
3270         }
3271         break;
3272 #endif
3273     default:
3274         *dir = -EINVAL;
3275         return NULL;
3276     }
3277
3278     *dir = -EINVAL;
3279
3280     if (len < sizeof(struct sadb_x_policy) ||
3281         pol->sadb_x_policy_len*8 > len ||
3282         pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3283         (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3284         return NULL;
3285
3286     xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3287     if (xp == NULL) {
3288         *dir = -ENOBUFS;
3289         return NULL;
3290     }
3291
3292     xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3293               XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3294
3295     xp->lft.soft_byte_limit = XFRM_INF;
3296     xp->lft.hard_byte_limit = XFRM_INF;
3297     xp->lft.soft_packet_limit = XFRM_INF;
3298     xp->lft.hard_packet_limit = XFRM_INF;
3299     xp->family = sk->sk_family;
3300
3301     xp->xfrm_nr = 0;
3302     if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3303         (*dir = parse_ipsecrequests(xp, pol)) < 0)
3304         goto out;
3305
3306     /* security context too */
3307     if (len >= (pol->sadb_x_policy_len*8 +
3308         sizeof(struct sadb_x_sec_ctx))) {
3309         char *p = (char *)pol;
3310         struct xfrm_user_sec_ctx *uctx;
3311
3312         p += pol->sadb_x_policy_len*8;
3313         sec_ctx = (struct sadb_x_sec_ctx *)p;
3314         if (len < pol->sadb_x_policy_len*8 +
3315             sec_ctx->sadb_x_sec_len*8) {
3316             *dir = -EINVAL;
3317             goto out;
3318         }
3319         if ((*dir = verify_sec_ctx_len(p)))
3320             goto out;
3321         uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3322         *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3323         kfree(uctx);
3324
3325         if (*dir)
3326             goto out;
3327     }
3328
3329     *dir = pol->sadb_x_policy_dir-1;
3330     return xp;
3331
3332 out:
3333     xp->walk.dead = 1;
3334     xfrm_policy_destroy(xp);
3335     return NULL;
3336 }
3337
3338 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3339 {
3340     struct sk_buff *skb;
3341     struct sadb_msg *hdr;
3342     struct sadb_sa *sa;
3343     struct sadb_address *addr;
3344     struct sadb_x_nat_t_port *n_port;
3345     int sockaddr_size;
3346     int size;
3347     __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3348     struct xfrm_encap_tmpl *natt = NULL;
3349
3350     sockaddr_size = pfkey_sockaddr_size(x->props.family);
3351     if (!sockaddr_size)
3352         return -EINVAL;
3353
3354     if (!satype)
3355         return -EINVAL;
3356
3357     if (!x->encap)
3358         return -EINVAL;
3359
3360     natt = x->encap;
3361
3362     /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3363      *
3364      * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3365      * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3366      */
3367
3368     size = sizeof(struct sadb_msg) +
3369         sizeof(struct sadb_sa) +
3370         (sizeof(struct sadb_address) * 2) +
3371         (sockaddr_size * 2) +
3372         (sizeof(struct sadb_x_nat_t_port) * 2);
3373
3374     skb =  alloc_skb(size + 16, GFP_ATOMIC);
3375     if (skb == NULL)
3376         return -ENOMEM;
3377
3378     hdr = skb_put(skb, sizeof(struct sadb_msg));
3379     hdr->sadb_msg_version = PF_KEY_V2;
3380     hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3381     hdr->sadb_msg_satype = satype;
3382     hdr->sadb_msg_len = size / sizeof(uint64_t);
3383     hdr->sadb_msg_errno = 0;
3384     hdr->sadb_msg_reserved = 0;
3385     hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3386     hdr->sadb_msg_pid = 0;
3387
3388     /* SA */
3389     sa = skb_put(skb, sizeof(struct sadb_sa));
3390     sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3391     sa->sadb_sa_exttype = SADB_EXT_SA;
3392     sa->sadb_sa_spi = x->id.spi;
3393     sa->sadb_sa_replay = 0;
3394     sa->sadb_sa_state = 0;
3395     sa->sadb_sa_auth = 0;
3396     sa->sadb_sa_encrypt = 0;
3397     sa->sadb_sa_flags = 0;
3398
3399     /* ADDRESS_SRC (old addr) */
3400     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3401     addr->sadb_address_len =
3402         (sizeof(struct sadb_address)+sockaddr_size)/
3403             sizeof(uint64_t);
3404     addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3405     addr->sadb_address_proto = 0;
3406     addr->sadb_address_reserved = 0;
3407     addr->sadb_address_prefixlen =
3408         pfkey_sockaddr_fill(&x->props.saddr, 0,
3409                     (struct sockaddr *) (addr + 1),
3410                     x->props.family);
3411     if (!addr->sadb_address_prefixlen)
3412         BUG();
3413
3414     /* NAT_T_SPORT (old port) */
3415     n_port = skb_put(skb, sizeof(*n_port));
3416     n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3417     n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3418     n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3419     n_port->sadb_x_nat_t_port_reserved = 0;
3420
3421     /* ADDRESS_DST (new addr) */
3422     addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3423     addr->sadb_address_len =
3424         (sizeof(struct sadb_address)+sockaddr_size)/
3425             sizeof(uint64_t);
3426     addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3427     addr->sadb_address_proto = 0;
3428     addr->sadb_address_reserved = 0;
3429     addr->sadb_address_prefixlen =
3430         pfkey_sockaddr_fill(ipaddr, 0,
3431                     (struct sockaddr *) (addr + 1),
3432                     x->props.family);
3433     if (!addr->sadb_address_prefixlen)
3434         BUG();
3435
3436     /* NAT_T_DPORT (new port) */
3437     n_port = skb_put(skb, sizeof(*n_port));
3438     n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3439     n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3440     n_port->sadb_x_nat_t_port_port = sport;
3441     n_port->sadb_x_nat_t_port_reserved = 0;
3442
3443     return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3444                    xs_net(x));
3445 }
3446
3447 #ifdef CONFIG_NET_KEY_MIGRATE
3448 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3449                 const struct xfrm_selector *sel)
3450 {
3451     struct sadb_address *addr;
3452     addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3453     addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3454     addr->sadb_address_exttype = type;
3455     addr->sadb_address_proto = sel->proto;
3456     addr->sadb_address_reserved = 0;
3457
3458     switch (type) {
3459     case SADB_EXT_ADDRESS_SRC:
3460         addr->sadb_address_prefixlen = sel->prefixlen_s;
3461         pfkey_sockaddr_fill(&sel->saddr, 0,
3462                     (struct sockaddr *)(addr + 1),
3463                     sel->family);
3464         break;
3465     case SADB_EXT_ADDRESS_DST:
3466         addr->sadb_address_prefixlen = sel->prefixlen_d;
3467         pfkey_sockaddr_fill(&sel->daddr, 0,
3468                     (struct sockaddr *)(addr + 1),
3469                     sel->family);
3470         break;
3471     default:
3472         return -EINVAL;
3473     }
3474
3475     return 0;
3476 }
3477
3478
3479 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3480 {
3481     struct sadb_x_kmaddress *kma;
3482     u8 *sa;
3483     int family = k->family;
3484     int socklen = pfkey_sockaddr_len(family);
3485     int size_req;
3486
3487     size_req = (sizeof(struct sadb_x_kmaddress) +
3488             pfkey_sockaddr_pair_size(family));
3489
3490     kma = skb_put_zero(skb, size_req);
3491     kma->sadb_x_kmaddress_len = size_req / 8;
3492     kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3493     kma->sadb_x_kmaddress_reserved = k->reserved;
3494
3495     sa = (u8 *)(kma + 1);
3496     if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3497         !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3498         return -EINVAL;
3499
3500     return 0;
3501 }
3502
3503 static int set_ipsecrequest(struct sk_buff *skb,
3504                 uint8_t proto, uint8_t mode, int level,
3505                 uint32_t reqid, uint8_t family,
3506                 const xfrm_address_t *src, const xfrm_address_t *dst)
3507 {
3508     struct sadb_x_ipsecrequest *rq;
3509     u8 *sa;
3510     int socklen = pfkey_sockaddr_len(family);
3511     int size_req;
3512
3513     size_req = sizeof(struct sadb_x_ipsecrequest) +
3514            pfkey_sockaddr_pair_size(family);
3515
3516     rq = skb_put_zero(skb, size_req);
3517     rq->sadb_x_ipsecrequest_len = size_req;
3518     rq->sadb_x_ipsecrequest_proto = proto;
3519     rq->sadb_x_ipsecrequest_mode = mode;
3520     rq->sadb_x_ipsecrequest_level = level;
3521     rq->sadb_x_ipsecrequest_reqid = reqid;
3522
3523     sa = (u8 *) (rq + 1);
3524     if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3525         !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3526         return -EINVAL;
3527
3528     return 0;
3529 }
3530 #endif
3531
3532 #ifdef CONFIG_NET_KEY_MIGRATE
3533 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3534                   const struct xfrm_migrate *m, int num_bundles,
3535                   const struct xfrm_kmaddress *k,
3536                   const struct xfrm_encap_tmpl *encap)
3537 {
3538     int i;
3539     int sasize_sel;
3540     int size = 0;
3541     int size_pol = 0;
3542     struct sk_buff *skb;
3543     struct sadb_msg *hdr;
3544     struct sadb_x_policy *pol;
3545     const struct xfrm_migrate *mp;
3546
3547     if (type != XFRM_POLICY_TYPE_MAIN)
3548         return 0;
3549
3550     if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3551         return -EINVAL;
3552
3553     if (k != NULL) {
3554         /* addresses for KM */
3555         size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3556                      pfkey_sockaddr_pair_size(k->family));
3557     }
3558
3559     /* selector */
3560     sasize_sel = pfkey_sockaddr_size(sel->family);
3561     if (!sasize_sel)
3562         return -EINVAL;
3563     size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3564
3565     /* policy info */
3566     size_pol += sizeof(struct sadb_x_policy);
3567
3568     /* ipsecrequests */
3569     for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3570         /* old locator pair */
3571         size_pol += sizeof(struct sadb_x_ipsecrequest) +
3572                 pfkey_sockaddr_pair_size(mp->old_family);
3573         /* new locator pair */
3574         size_pol += sizeof(struct sadb_x_ipsecrequest) +
3575                 pfkey_sockaddr_pair_size(mp->new_family);
3576     }
3577
3578     size += sizeof(struct sadb_msg) + size_pol;
3579
3580     /* alloc buffer */
3581     skb = alloc_skb(size, GFP_ATOMIC);
3582     if (skb == NULL)
3583         return -ENOMEM;
3584
3585     hdr = skb_put(skb, sizeof(struct sadb_msg));
3586     hdr->sadb_msg_version = PF_KEY_V2;
3587     hdr->sadb_msg_type = SADB_X_MIGRATE;
3588     hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3589     hdr->sadb_msg_len = size / 8;
3590     hdr->sadb_msg_errno = 0;
3591     hdr->sadb_msg_reserved = 0;
3592     hdr->sadb_msg_seq = 0;
3593     hdr->sadb_msg_pid = 0;
3594
3595     /* Addresses to be used by KM for negotiation, if ext is available */
3596     if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3597         goto err;
3598
3599     /* selector src */
3600     set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3601
3602     /* selector dst */
3603     set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3604
3605     /* policy information */
3606     pol = skb_put(skb, sizeof(struct sadb_x_policy));
3607     pol->sadb_x_policy_len = size_pol / 8;
3608     pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3609     pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3610     pol->sadb_x_policy_dir = dir + 1;
3611     pol->sadb_x_policy_reserved = 0;
3612     pol->sadb_x_policy_id = 0;
3613     pol->sadb_x_policy_priority = 0;
3614
3615     for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3616         /* old ipsecrequest */
3617         int mode = pfkey_mode_from_xfrm(mp->mode);
3618         if (mode < 0)
3619             goto err;
3620         if (set_ipsecrequest(skb, mp->proto, mode,
3621                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3622                      mp->reqid, mp->old_family,
3623                      &mp->old_saddr, &mp->old_daddr) < 0)
3624             goto err;
3625
3626         /* new ipsecrequest */
3627         if (set_ipsecrequest(skb, mp->proto, mode,
3628                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3629                      mp->reqid, mp->new_family,
3630                      &mp->new_saddr, &mp->new_daddr) < 0)
3631             goto err;
3632     }
3633
3634     /* broadcast migrate message to sockets */
3635     pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3636
3637     return 0;
3638
3639 err:
3640     kfree_skb(skb);
3641     return -EINVAL;
3642 }
3643 #else
3644 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3645                   const struct xfrm_migrate *m, int num_bundles,
3646                   const struct xfrm_kmaddress *k,
3647                   const struct xfrm_encap_tmpl *encap)
3648 {
3649     return -ENOPROTOOPT;
3650 }
3651 #endif
3652
3653 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3654 {
3655     struct sock *sk = sock->sk;
3656     struct sk_buff *skb = NULL;
3657     struct sadb_msg *hdr = NULL;
3658     int err;
3659     struct net *net = sock_net(sk);
3660
3661     err = -EOPNOTSUPP;
3662     if (msg->msg_flags & MSG_OOB)
3663         goto out;
3664
3665     err = -EMSGSIZE;
3666     if ((unsigned int)len > sk->sk_sndbuf - 32)
3667         goto out;
3668
3669     err = -ENOBUFS;
3670     skb = alloc_skb(len, GFP_KERNEL);
3671     if (skb == NULL)
3672         goto out;
3673
3674     err = -EFAULT;
3675     if (memcpy_from_msg(skb_put(skb,len), msg, len))
3676         goto out;
3677
3678     hdr = pfkey_get_base_msg(skb, &err);
3679     if (!hdr)
3680         goto out;
3681
3682     mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3683     err = pfkey_process(sk, skb, hdr);
3684     mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3685
3686 out:
3687     if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3688         err = 0;
3689     kfree_skb(skb);
3690
3691     return err ? : len;
3692 }
3693
3694 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3695              int flags)
3696 {
3697     struct sock *sk = sock->sk;
3698     struct pfkey_sock *pfk = pfkey_sk(sk);
3699     struct sk_buff *skb;
3700     int copied, err;
3701
3702     err = -EINVAL;
3703     if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3704         goto out;
3705
3706     skb = skb_recv_datagram(sk, flags, &err);
3707     if (skb == NULL)
3708         goto out;
3709
3710     copied = skb->len;
3711     if (copied > len) {
3712         msg->msg_flags |= MSG_TRUNC;
3713         copied = len;
3714     }
3715
3716     skb_reset_transport_header(skb);
3717     err = skb_copy_datagram_msg(skb, 0, msg, copied);
3718     if (err)
3719         goto out_free;
3720
3721     sock_recv_cmsgs(msg, sk, skb);
3722
3723     err = (flags & MSG_TRUNC) ? skb->len : copied;
3724
3725     if (pfk->dump.dump != NULL &&
3726         3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3727         pfkey_do_dump(pfk);
3728
3729 out_free:
3730     skb_free_datagram(sk, skb);
3731 out:
3732     return err;
3733 }
3734
3735 static const struct proto_ops pfkey_ops = {
3736     .family     =   PF_KEY,
3737     .owner      =   THIS_MODULE,
3738     /* Operations that make no sense on pfkey sockets. */
3739     .bind       =   sock_no_bind,
3740     .connect    =   sock_no_connect,
3741     .socketpair =   sock_no_socketpair,
3742     .accept     =   sock_no_accept,
3743     .getname    =   sock_no_getname,
3744     .ioctl      =   sock_no_ioctl,
3745     .listen     =   sock_no_listen,
3746     .shutdown   =   sock_no_shutdown,
3747     .mmap       =   sock_no_mmap,
3748     .sendpage   =   sock_no_sendpage,
3749
3750     /* Now the operations that really occur. */
3751     .release    =   pfkey_release,
3752     .poll       =   datagram_poll,
3753     .sendmsg    =   pfkey_sendmsg,
3754     .recvmsg    =   pfkey_recvmsg,
3755 };
3756
3757 static const struct net_proto_family pfkey_family_ops = {
3758     .family =   PF_KEY,
3759     .create =   pfkey_create,
3760     .owner  =   THIS_MODULE,
3761 };
3762
3763 #ifdef CONFIG_PROC_FS
3764 static int pfkey_seq_show(struct seq_file *f, void *v)
3765 {
3766     struct sock *s = sk_entry(v);
3767
3768     if (v == SEQ_START_TOKEN)
3769         seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3770     else
3771         seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3772                    s,
3773                    refcount_read(&s->sk_refcnt),
3774                    sk_rmem_alloc_get(s),
3775                    sk_wmem_alloc_get(s),
3776                    from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3777                    sock_i_ino(s)
3778                    );
3779     return 0;
3780 }
3781
3782 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3783     __acquires(rcu)
3784 {
3785     struct net *net = seq_file_net(f);
3786     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3787
3788     rcu_read_lock();
3789     return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3790 }
3791
3792 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3793 {
3794     struct net *net = seq_file_net(f);
3795     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3796
3797     return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3798 }
3799
3800 static void pfkey_seq_stop(struct seq_file *f, void *v)
3801     __releases(rcu)
3802 {
3803     rcu_read_unlock();
3804 }
3805
3806 static const struct seq_operations pfkey_seq_ops = {
3807     .start  = pfkey_seq_start,
3808     .next   = pfkey_seq_next,
3809     .stop   = pfkey_seq_stop,
3810     .show   = pfkey_seq_show,
3811 };
3812
3813 static int __net_init pfkey_init_proc(struct net *net)
3814 {
3815     struct proc_dir_entry *e;
3816
3817     e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3818             sizeof(struct seq_net_private));
3819     if (e == NULL)
3820         return -ENOMEM;
3821
3822     return 0;
3823 }
3824
3825 static void __net_exit pfkey_exit_proc(struct net *net)
3826 {
3827     remove_proc_entry("pfkey", net->proc_net);
3828 }
3829 #else
3830 static inline int pfkey_init_proc(struct net *net)
3831 {
3832     return 0;
3833 }
3834
3835 static inline void pfkey_exit_proc(struct net *net)
3836 {
3837 }
3838 #endif
3839
3840 static struct xfrm_mgr pfkeyv2_mgr =
3841 {
3842     .notify     = pfkey_send_notify,
3843     .acquire    = pfkey_send_acquire,
3844     .compile_policy = pfkey_compile_policy,
3845     .new_mapping    = pfkey_send_new_mapping,
3846     .notify_policy  = pfkey_send_policy_notify,
3847     .migrate    = pfkey_send_migrate,
3848     .is_alive   = pfkey_is_alive,
3849 };
3850
3851 static int __net_init pfkey_net_init(struct net *net)
3852 {
3853     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3854     int rv;
3855
3856     INIT_HLIST_HEAD(&net_pfkey->table);
3857     atomic_set(&net_pfkey->socks_nr, 0);
3858
3859     rv = pfkey_init_proc(net);
3860
3861     return rv;
3862 }
3863
3864 static void __net_exit pfkey_net_exit(struct net *net)
3865 {
3866     struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3867
3868     pfkey_exit_proc(net);
3869     WARN_ON(!hlist_empty(&net_pfkey->table));
3870 }
3871
3872 static struct pernet_operations pfkey_net_ops = {
3873     .init = pfkey_net_init,
3874     .exit = pfkey_net_exit,
3875     .id   = &pfkey_net_id,
3876     .size = sizeof(struct netns_pfkey),
3877 };
3878
3879 static void __exit ipsec_pfkey_exit(void)
3880 {
3881     xfrm_unregister_km(&pfkeyv2_mgr);
3882     sock_unregister(PF_KEY);
3883     unregister_pernet_subsys(&pfkey_net_ops);
3884     proto_unregister(&key_proto);
3885 }
3886
3887 static int __init ipsec_pfkey_init(void)
3888 {
3889     int err = proto_register(&key_proto, 0);
3890
3891     if (err != 0)
3892         goto out;
3893
3894     err = register_pernet_subsys(&pfkey_net_ops);
3895     if (err != 0)
3896         goto out_unregister_key_proto;
3897     err = sock_register(&pfkey_family_ops);
3898     if (err != 0)
3899         goto out_unregister_pernet;
3900     xfrm_register_km(&pfkeyv2_mgr);
3901 out:
3902     return err;
3903
3904 out_unregister_pernet:
3905     unregister_pernet_subsys(&pfkey_net_ops);
3906 out_unregister_key_proto:
3907     proto_unregister(&key_proto);
3908     goto out;
3909 }
3910
3911 module_init(ipsec_pfkey_init);
3912 module_exit(ipsec_pfkey_exit);
3913 MODULE_LICENSE("GPL");
3914 MODULE_ALIAS_NETPROTO(PF_KEY);