net/key/af_key.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   4  *
   5  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
   6  *              David S. Miller <davem@redhat.com>
   7  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
   8  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
   9  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  10  *              Derek Atkins <derek@ihtfp.com>
  11  */
  12
  13 #include <linux/capability.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/socket.h>
  17 #include <linux/pfkeyv2.h>
  18 #include <linux/ipsec.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/in.h>
  22 #include <linux/in6.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <net/net_namespace.h>
  27 #include <net/netns/generic.h>
  28 #include <net/xfrm.h>
  29
  30 #include <net/sock.h>
  31
  32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  34
  35 static unsigned int pfkey_net_id __read_mostly;
  36 struct netns_pfkey {
  37         /* List of all pfkey sockets. */
  38         struct hlist_head table;
  39         atomic_t socks_nr;
  40 };
  41 static DEFINE_MUTEX(pfkey_mutex);
  42
  43 #define DUMMY_MARK 0
  44 static const struct xfrm_mark dummy_mark = {0, 0};
  45 struct pfkey_sock {
  46         /* struct sock must be the first member of struct pfkey_sock */
  47         struct sock     sk;
  48         int             registered;
  49         int             promisc;
  50
  51         struct {
  52                 uint8_t         msg_version;
  53                 uint32_t        msg_portid;
  54                 int             (*dump)(struct pfkey_sock *sk);
  55                 void            (*done)(struct pfkey_sock *sk);
  56                 union {
  57                         struct xfrm_policy_walk policy;
  58                         struct xfrm_state_walk  state;
  59                 } u;
  60                 struct sk_buff  *skb;
  61         } dump;
  62         struct mutex dump_lock;
  63 };
  64
  65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  66                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  67                                u16 *family);
  68
  69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  70 {
  71         return (struct pfkey_sock *)sk;
  72 }
  73
  74 static int pfkey_can_dump(const struct sock *sk)
  75 {
  76         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  77                 return 1;
  78         return 0;
  79 }
  80
  81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  82 {
  83         if (pfk->dump.dump) {
  84                 if (pfk->dump.skb) {
  85                         kfree_skb(pfk->dump.skb);
  86                         pfk->dump.skb = NULL;
  87                 }
  88                 pfk->dump.done(pfk);
  89                 pfk->dump.dump = NULL;
  90                 pfk->dump.done = NULL;
  91         }
  92 }
  93
  94 static void pfkey_sock_destruct(struct sock *sk)
  95 {
  96         struct net *net = sock_net(sk);
  97         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  98
  99         pfkey_terminate_dump(pfkey_sk(sk));
 100         skb_queue_purge(&sk->sk_receive_queue);
 101
 102         if (!sock_flag(sk, SOCK_DEAD)) {
 103                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 104                 return;
 105         }
 106
 107         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 108         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 109
 110         atomic_dec(&net_pfkey->socks_nr);
 111 }
 112
 113 static const struct proto_ops pfkey_ops;
 114
 115 static void pfkey_insert(struct sock *sk)
 116 {
 117         struct net *net = sock_net(sk);
 118         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 119
 120         mutex_lock(&pfkey_mutex);
 121         sk_add_node_rcu(sk, &net_pfkey->table);
 122         mutex_unlock(&pfkey_mutex);
 123 }
 124
 125 static void pfkey_remove(struct sock *sk)
 126 {
 127         mutex_lock(&pfkey_mutex);
 128         sk_del_node_init_rcu(sk);
 129         mutex_unlock(&pfkey_mutex);
 130 }
 131
 132 static struct proto key_proto = {
 133         .name     = "KEY",
 134         .owner    = THIS_MODULE,
 135         .obj_size = sizeof(struct pfkey_sock),
 136 };
 137
 138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 139                         int kern)
 140 {
 141         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 142         struct sock *sk;
 143         struct pfkey_sock *pfk;
 144         int err;
 145
 146         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 147                 return -EPERM;
 148         if (sock->type != SOCK_RAW)
 149                 return -ESOCKTNOSUPPORT;
 150         if (protocol != PF_KEY_V2)
 151                 return -EPROTONOSUPPORT;
 152
 153         err = -ENOMEM;
 154         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 155         if (sk == NULL)
 156                 goto out;
 157
 158         pfk = pfkey_sk(sk);
 159         mutex_init(&pfk->dump_lock);
 160
 161         sock->ops = &pfkey_ops;
 162         sock_init_data(sock, sk);
 163
 164         sk->sk_family = PF_KEY;
 165         sk->sk_destruct = pfkey_sock_destruct;
 166
 167         atomic_inc(&net_pfkey->socks_nr);
 168
 169         pfkey_insert(sk);
 170
 171         return 0;
 172 out:
 173         return err;
 174 }
 175
 176 static int pfkey_release(struct socket *sock)
 177 {
 178         struct sock *sk = sock->sk;
 179
 180         if (!sk)
 181                 return 0;
 182
 183         pfkey_remove(sk);
 184
 185         sock_orphan(sk);
 186         sock->sk = NULL;
 187         skb_queue_purge(&sk->sk_write_queue);
 188
 189         synchronize_rcu();
 190         sock_put(sk);
 191
 192         return 0;
 193 }
 194
 195 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation,
 196                                struct sock *sk)
 197 {
 198         int err = -ENOBUFS;
 199
 200         if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 201                 return err;
 202
 203         skb = skb_clone(skb, allocation);
 204
 205         if (skb) {
 206                 skb_set_owner_r(skb, sk);
 207                 skb_queue_tail(&sk->sk_receive_queue, skb);
 208                 sk->sk_data_ready(sk);
 209                 err = 0;
 210         }
 211         return err;
 212 }
 213
 214 /* Send SKB to all pfkey sockets matching selected criteria.  */
 215 #define BROADCAST_ALL           0
 216 #define BROADCAST_ONE           1
 217 #define BROADCAST_REGISTERED    2
 218 #define BROADCAST_PROMISC_ONLY  4
 219 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 220                            int broadcast_flags, struct sock *one_sk,
 221                            struct net *net)
 222 {
 223         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 224         struct sock *sk;
 225         int err = -ESRCH;
 226
 227         /* XXX Do we need something like netlink_overrun?  I think
 228          * XXX PF_KEY socket apps will not mind current behavior.
 229          */
 230         if (!skb)
 231                 return -ENOMEM;
 232
 233         rcu_read_lock();
 234         sk_for_each_rcu(sk, &net_pfkey->table) {
 235                 struct pfkey_sock *pfk = pfkey_sk(sk);
 236                 int err2;
 237
 238                 /* Yes, it means that if you are meant to receive this
 239                  * pfkey message you receive it twice as promiscuous
 240                  * socket.
 241                  */
 242                 if (pfk->promisc)
 243                         pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 244
 245                 /* the exact target will be processed later */
 246                 if (sk == one_sk)
 247                         continue;
 248                 if (broadcast_flags != BROADCAST_ALL) {
 249                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 250                                 continue;
 251                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 252                             !pfk->registered)
 253                                 continue;
 254                         if (broadcast_flags & BROADCAST_ONE)
 255                                 continue;
 256                 }
 257
 258                 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 259
 260                 /* Error is cleared after successful sending to at least one
 261                  * registered KM */
 262                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 263                         err = err2;
 264         }
 265         rcu_read_unlock();
 266
 267         if (one_sk != NULL)
 268                 err = pfkey_broadcast_one(skb, allocation, one_sk);
 269
 270         kfree_skb(skb);
 271         return err;
 272 }
 273
 274 static int pfkey_do_dump(struct pfkey_sock *pfk)
 275 {
 276         struct sadb_msg *hdr;
 277         int rc;
 278
 279         mutex_lock(&pfk->dump_lock);
 280         if (!pfk->dump.dump) {
 281                 rc = 0;
 282                 goto out;
 283         }
 284
 285         rc = pfk->dump.dump(pfk);
 286         if (rc == -ENOBUFS) {
 287                 rc = 0;
 288                 goto out;
 289         }
 290
 291         if (pfk->dump.skb) {
 292                 if (!pfkey_can_dump(&pfk->sk)) {
 293                         rc = 0;
 294                         goto out;
 295                 }
 296
 297                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 298                 hdr->sadb_msg_seq = 0;
 299                 hdr->sadb_msg_errno = rc;
 300                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 301                                 &pfk->sk, sock_net(&pfk->sk));
 302                 pfk->dump.skb = NULL;
 303         }
 304
 305         pfkey_terminate_dump(pfk);
 306
 307 out:
 308         mutex_unlock(&pfk->dump_lock);
 309         return rc;
 310 }
 311
 312 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 313                                  const struct sadb_msg *orig)
 314 {
 315         *new = *orig;
 316 }
 317
 318 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 319 {
 320         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 321         struct sadb_msg *hdr;
 322
 323         if (!skb)
 324                 return -ENOBUFS;
 325
 326         /* Woe be to the platform trying to support PFKEY yet
 327          * having normal errnos outside the 1-255 range, inclusive.
 328          */
 329         err = -err;
 330         if (err == ERESTARTSYS ||
 331             err == ERESTARTNOHAND ||
 332             err == ERESTARTNOINTR)
 333                 err = EINTR;
 334         if (err >= 512)
 335                 err = EINVAL;
 336         BUG_ON(err <= 0 || err >= 256);
 337
 338         hdr = skb_put(skb, sizeof(struct sadb_msg));
 339         pfkey_hdr_dup(hdr, orig);
 340         hdr->sadb_msg_errno = (uint8_t) err;
 341         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 342                              sizeof(uint64_t));
 343
 344         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 345
 346         return 0;
 347 }
 348
 349 static const u8 sadb_ext_min_len[] = {
 350         [SADB_EXT_RESERVED]             = (u8) 0,
 351         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 352         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 353         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 354         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 355         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 356         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 357         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 358         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 359         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 360         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 361         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 362         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 363         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 364         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 365         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 366         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 367         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 368         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 369         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 370         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 371         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 372         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 373         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 374         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 375         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 376         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 377 };
 378
 379 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 380 static int verify_address_len(const void *p)
 381 {
 382         const struct sadb_address *sp = p;
 383         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 384         const struct sockaddr_in *sin;
 385 #if IS_ENABLED(CONFIG_IPV6)
 386         const struct sockaddr_in6 *sin6;
 387 #endif
 388         int len;
 389
 390         if (sp->sadb_address_len <
 391             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 392                          sizeof(uint64_t)))
 393                 return -EINVAL;
 394
 395         switch (addr->sa_family) {
 396         case AF_INET:
 397                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 398                 if (sp->sadb_address_len != len ||
 399                     sp->sadb_address_prefixlen > 32)
 400                         return -EINVAL;
 401                 break;
 402 #if IS_ENABLED(CONFIG_IPV6)
 403         case AF_INET6:
 404                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 405                 if (sp->sadb_address_len != len ||
 406                     sp->sadb_address_prefixlen > 128)
 407                         return -EINVAL;
 408                 break;
 409 #endif
 410         default:
 411                 /* It is user using kernel to keep track of security
 412                  * associations for another protocol, such as
 413                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 414                  * lengths.
 415                  *
 416                  * XXX Actually, association/policy database is not yet
 417                  * XXX able to cope with arbitrary sockaddr families.
 418                  * XXX When it can, remove this -EINVAL.  -DaveM
 419                  */
 420                 return -EINVAL;
 421         }
 422
 423         return 0;
 424 }
 425
 426 static inline int sadb_key_len(const struct sadb_key *key)
 427 {
 428         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 429
 430         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 431                             sizeof(uint64_t));
 432 }
 433
 434 static int verify_key_len(const void *p)
 435 {
 436         const struct sadb_key *key = p;
 437
 438         if (sadb_key_len(key) > key->sadb_key_len)
 439                 return -EINVAL;
 440
 441         return 0;
 442 }
 443
 444 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 445 {
 446         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 447                             sec_ctx->sadb_x_ctx_len,
 448                             sizeof(uint64_t));
 449 }
 450
 451 static inline int verify_sec_ctx_len(const void *p)
 452 {
 453         const struct sadb_x_sec_ctx *sec_ctx = p;
 454         int len = sec_ctx->sadb_x_ctx_len;
 455
 456         if (len > PAGE_SIZE)
 457                 return -EINVAL;
 458
 459         len = pfkey_sec_ctx_len(sec_ctx);
 460
 461         if (sec_ctx->sadb_x_sec_len != len)
 462                 return -EINVAL;
 463
 464         return 0;
 465 }
 466
 467 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 468                                                                      gfp_t gfp)
 469 {
 470         struct xfrm_user_sec_ctx *uctx = NULL;
 471         int ctx_size = sec_ctx->sadb_x_ctx_len;
 472
 473         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 474
 475         if (!uctx)
 476                 return NULL;
 477
 478         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 479         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 480         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 481         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 482         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 483         memcpy(uctx + 1, sec_ctx + 1,
 484                uctx->ctx_len);
 485
 486         return uctx;
 487 }
 488
 489 static int present_and_same_family(const struct sadb_address *src,
 490                                    const struct sadb_address *dst)
 491 {
 492         const struct sockaddr *s_addr, *d_addr;
 493
 494         if (!src || !dst)
 495                 return 0;
 496
 497         s_addr = (const struct sockaddr *)(src + 1);
 498         d_addr = (const struct sockaddr *)(dst + 1);
 499         if (s_addr->sa_family != d_addr->sa_family)
 500                 return 0;
 501         if (s_addr->sa_family != AF_INET
 502 #if IS_ENABLED(CONFIG_IPV6)
 503             && s_addr->sa_family != AF_INET6
 504 #endif
 505                 )
 506                 return 0;
 507
 508         return 1;
 509 }
 510
 511 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 512 {
 513         const char *p = (char *) hdr;
 514         int len = skb->len;
 515
 516         len -= sizeof(*hdr);
 517         p += sizeof(*hdr);
 518         while (len > 0) {
 519                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 520                 uint16_t ext_type;
 521                 int ext_len;
 522
 523                 if (len < sizeof(*ehdr))
 524                         return -EINVAL;
 525
 526                 ext_len  = ehdr->sadb_ext_len;
 527                 ext_len *= sizeof(uint64_t);
 528                 ext_type = ehdr->sadb_ext_type;
 529                 if (ext_len < sizeof(uint64_t) ||
 530                     ext_len > len ||
 531                     ext_type == SADB_EXT_RESERVED)
 532                         return -EINVAL;
 533
 534                 if (ext_type <= SADB_EXT_MAX) {
 535                         int min = (int) sadb_ext_min_len[ext_type];
 536                         if (ext_len < min)
 537                                 return -EINVAL;
 538                         if (ext_hdrs[ext_type-1] != NULL)
 539                                 return -EINVAL;
 540                         switch (ext_type) {
 541                         case SADB_EXT_ADDRESS_SRC:
 542                         case SADB_EXT_ADDRESS_DST:
 543                         case SADB_EXT_ADDRESS_PROXY:
 544                         case SADB_X_EXT_NAT_T_OA:
 545                                 if (verify_address_len(p))
 546                                         return -EINVAL;
 547                                 break;
 548                         case SADB_X_EXT_SEC_CTX:
 549                                 if (verify_sec_ctx_len(p))
 550                                         return -EINVAL;
 551                                 break;
 552                         case SADB_EXT_KEY_AUTH:
 553                         case SADB_EXT_KEY_ENCRYPT:
 554                                 if (verify_key_len(p))
 555                                         return -EINVAL;
 556                                 break;
 557                         default:
 558                                 break;
 559                         }
 560                         ext_hdrs[ext_type-1] = (void *) p;
 561                 }
 562                 p   += ext_len;
 563                 len -= ext_len;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static uint16_t
 570 pfkey_satype2proto(uint8_t satype)
 571 {
 572         switch (satype) {
 573         case SADB_SATYPE_UNSPEC:
 574                 return IPSEC_PROTO_ANY;
 575         case SADB_SATYPE_AH:
 576                 return IPPROTO_AH;
 577         case SADB_SATYPE_ESP:
 578                 return IPPROTO_ESP;
 579         case SADB_X_SATYPE_IPCOMP:
 580                 return IPPROTO_COMP;
 581         default:
 582                 return 0;
 583         }
 584         /* NOTREACHED */
 585 }
 586
 587 static uint8_t
 588 pfkey_proto2satype(uint16_t proto)
 589 {
 590         switch (proto) {
 591         case IPPROTO_AH:
 592                 return SADB_SATYPE_AH;
 593         case IPPROTO_ESP:
 594                 return SADB_SATYPE_ESP;
 595         case IPPROTO_COMP:
 596                 return SADB_X_SATYPE_IPCOMP;
 597         default:
 598                 return 0;
 599         }
 600         /* NOTREACHED */
 601 }
 602
 603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 604  * say specifically 'just raw sockets' as we encode them as 255.
 605  */
 606
 607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 608 {
 609         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 610 }
 611
 612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 613 {
 614         return proto ? proto : IPSEC_PROTO_ANY;
 615 }
 616
 617 static inline int pfkey_sockaddr_len(sa_family_t family)
 618 {
 619         switch (family) {
 620         case AF_INET:
 621                 return sizeof(struct sockaddr_in);
 622 #if IS_ENABLED(CONFIG_IPV6)
 623         case AF_INET6:
 624                 return sizeof(struct sockaddr_in6);
 625 #endif
 626         }
 627         return 0;
 628 }
 629
 630 static
 631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 632 {
 633         switch (sa->sa_family) {
 634         case AF_INET:
 635                 xaddr->a4 =
 636                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 637                 return AF_INET;
 638 #if IS_ENABLED(CONFIG_IPV6)
 639         case AF_INET6:
 640                 memcpy(xaddr->a6,
 641                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 642                        sizeof(struct in6_addr));
 643                 return AF_INET6;
 644 #endif
 645         }
 646         return 0;
 647 }
 648
 649 static
 650 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 651 {
 652         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 653                                       xaddr);
 654 }
 655
 656 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 657 {
 658         const struct sadb_sa *sa;
 659         const struct sadb_address *addr;
 660         uint16_t proto;
 661         unsigned short family;
 662         xfrm_address_t *xaddr;
 663
 664         sa = ext_hdrs[SADB_EXT_SA - 1];
 665         if (sa == NULL)
 666                 return NULL;
 667
 668         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 669         if (proto == 0)
 670                 return NULL;
 671
 672         /* sadb_address_len should be checked by caller */
 673         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 674         if (addr == NULL)
 675                 return NULL;
 676
 677         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 678         switch (family) {
 679         case AF_INET:
 680                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 681                 break;
 682 #if IS_ENABLED(CONFIG_IPV6)
 683         case AF_INET6:
 684                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 685                 break;
 686 #endif
 687         default:
 688                 xaddr = NULL;
 689         }
 690
 691         if (!xaddr)
 692                 return NULL;
 693
 694         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 695 }
 696
 697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 698
 699 static int
 700 pfkey_sockaddr_size(sa_family_t family)
 701 {
 702         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 703 }
 704
 705 static inline int pfkey_mode_from_xfrm(int mode)
 706 {
 707         switch(mode) {
 708         case XFRM_MODE_TRANSPORT:
 709                 return IPSEC_MODE_TRANSPORT;
 710         case XFRM_MODE_TUNNEL:
 711                 return IPSEC_MODE_TUNNEL;
 712         case XFRM_MODE_BEET:
 713                 return IPSEC_MODE_BEET;
 714         default:
 715                 return -1;
 716         }
 717 }
 718
 719 static inline int pfkey_mode_to_xfrm(int mode)
 720 {
 721         switch(mode) {
 722         case IPSEC_MODE_ANY:    /*XXX*/
 723         case IPSEC_MODE_TRANSPORT:
 724                 return XFRM_MODE_TRANSPORT;
 725         case IPSEC_MODE_TUNNEL:
 726                 return XFRM_MODE_TUNNEL;
 727         case IPSEC_MODE_BEET:
 728                 return XFRM_MODE_BEET;
 729         default:
 730                 return -1;
 731         }
 732 }
 733
 734 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 735                                         struct sockaddr *sa,
 736                                         unsigned short family)
 737 {
 738         switch (family) {
 739         case AF_INET:
 740             {
 741                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 742                 sin->sin_family = AF_INET;
 743                 sin->sin_port = port;
 744                 sin->sin_addr.s_addr = xaddr->a4;
 745                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 746                 return 32;
 747             }
 748 #if IS_ENABLED(CONFIG_IPV6)
 749         case AF_INET6:
 750             {
 751                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 752                 sin6->sin6_family = AF_INET6;
 753                 sin6->sin6_port = port;
 754                 sin6->sin6_flowinfo = 0;
 755                 sin6->sin6_addr = xaddr->in6;
 756                 sin6->sin6_scope_id = 0;
 757                 return 128;
 758             }
 759 #endif
 760         }
 761         return 0;
 762 }
 763
 764 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 765                                               int add_keys, int hsc)
 766 {
 767         struct sk_buff *skb;
 768         struct sadb_msg *hdr;
 769         struct sadb_sa *sa;
 770         struct sadb_lifetime *lifetime;
 771         struct sadb_address *addr;
 772         struct sadb_key *key;
 773         struct sadb_x_sa2 *sa2;
 774         struct sadb_x_sec_ctx *sec_ctx;
 775         struct xfrm_sec_ctx *xfrm_ctx;
 776         int ctx_size = 0;
 777         int size;
 778         int auth_key_size = 0;
 779         int encrypt_key_size = 0;
 780         int sockaddr_size;
 781         struct xfrm_encap_tmpl *natt = NULL;
 782         int mode;
 783
 784         /* address family check */
 785         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 786         if (!sockaddr_size)
 787                 return ERR_PTR(-EINVAL);
 788
 789         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 790            key(AE), (identity(SD),) (sensitivity)> */
 791         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 792                 sizeof(struct sadb_lifetime) +
 793                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 794                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 795                         sizeof(struct sadb_address)*2 +
 796                                 sockaddr_size*2 +
 797                                         sizeof(struct sadb_x_sa2);
 798
 799         if ((xfrm_ctx = x->security)) {
 800                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 801                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 802         }
 803
 804         /* identity & sensitivity */
 805         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 806                 size += sizeof(struct sadb_address) + sockaddr_size;
 807
 808         if (add_keys) {
 809                 if (x->aalg && x->aalg->alg_key_len) {
 810                         auth_key_size =
 811                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 812                         size += sizeof(struct sadb_key) + auth_key_size;
 813                 }
 814                 if (x->ealg && x->ealg->alg_key_len) {
 815                         encrypt_key_size =
 816                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 817                         size += sizeof(struct sadb_key) + encrypt_key_size;
 818                 }
 819         }
 820         if (x->encap)
 821                 natt = x->encap;
 822
 823         if (natt && natt->encap_type) {
 824                 size += sizeof(struct sadb_x_nat_t_type);
 825                 size += sizeof(struct sadb_x_nat_t_port);
 826                 size += sizeof(struct sadb_x_nat_t_port);
 827         }
 828
 829         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 830         if (skb == NULL)
 831                 return ERR_PTR(-ENOBUFS);
 832
 833         /* call should fill header later */
 834         hdr = skb_put(skb, sizeof(struct sadb_msg));
 835         memset(hdr, 0, size);   /* XXX do we need this ? */
 836         hdr->sadb_msg_len = size / sizeof(uint64_t);
 837
 838         /* sa */
 839         sa = skb_put(skb, sizeof(struct sadb_sa));
 840         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 841         sa->sadb_sa_exttype = SADB_EXT_SA;
 842         sa->sadb_sa_spi = x->id.spi;
 843         sa->sadb_sa_replay = x->props.replay_window;
 844         switch (x->km.state) {
 845         case XFRM_STATE_VALID:
 846                 sa->sadb_sa_state = x->km.dying ?
 847                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 848                 break;
 849         case XFRM_STATE_ACQ:
 850                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 851                 break;
 852         default:
 853                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 854                 break;
 855         }
 856         sa->sadb_sa_auth = 0;
 857         if (x->aalg) {
 858                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 859                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 860                                         a->desc.sadb_alg_id : 0;
 861         }
 862         sa->sadb_sa_encrypt = 0;
 863         BUG_ON(x->ealg && x->calg);
 864         if (x->ealg) {
 865                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 866                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 867                                         a->desc.sadb_alg_id : 0;
 868         }
 869         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 870         if (x->calg) {
 871                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 872                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 873                                         a->desc.sadb_alg_id : 0;
 874         }
 875
 876         sa->sadb_sa_flags = 0;
 877         if (x->props.flags & XFRM_STATE_NOECN)
 878                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 879         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 880                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 881         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 882                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 883
 884         /* hard time */
 885         if (hsc & 2) {
 886                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 887                 lifetime->sadb_lifetime_len =
 888                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 889                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 890                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 891                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 892                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 893                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 894         }
 895         /* soft time */
 896         if (hsc & 1) {
 897                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 898                 lifetime->sadb_lifetime_len =
 899                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 900                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 901                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 902                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 903                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 904                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 905         }
 906         /* current time */
 907         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 908         lifetime->sadb_lifetime_len =
 909                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 910         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 911         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 912         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 913         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 914         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 915         /* src address */
 916         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 917         addr->sadb_address_len =
 918                 (sizeof(struct sadb_address)+sockaddr_size)/
 919                         sizeof(uint64_t);
 920         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 921         /* "if the ports are non-zero, then the sadb_address_proto field,
 922            normally zero, MUST be filled in with the transport
 923            protocol's number." - RFC2367 */
 924         addr->sadb_address_proto = 0;
 925         addr->sadb_address_reserved = 0;
 926
 927         addr->sadb_address_prefixlen =
 928                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 929                                     (struct sockaddr *) (addr + 1),
 930                                     x->props.family);
 931         BUG_ON(!addr->sadb_address_prefixlen);
 932
 933         /* dst address */
 934         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 935         addr->sadb_address_len =
 936                 (sizeof(struct sadb_address)+sockaddr_size)/
 937                         sizeof(uint64_t);
 938         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 939         addr->sadb_address_proto = 0;
 940         addr->sadb_address_reserved = 0;
 941
 942         addr->sadb_address_prefixlen =
 943                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 944                                     (struct sockaddr *) (addr + 1),
 945                                     x->props.family);
 946         BUG_ON(!addr->sadb_address_prefixlen);
 947
 948         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 949                              x->props.family)) {
 950                 addr = skb_put(skb,
 951                                sizeof(struct sadb_address) + sockaddr_size);
 952                 addr->sadb_address_len =
 953                         (sizeof(struct sadb_address)+sockaddr_size)/
 954                         sizeof(uint64_t);
 955                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 956                 addr->sadb_address_proto =
 957                         pfkey_proto_from_xfrm(x->sel.proto);
 958                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 959                 addr->sadb_address_reserved = 0;
 960
 961                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 962                                     (struct sockaddr *) (addr + 1),
 963                                     x->props.family);
 964         }
 965
 966         /* auth key */
 967         if (add_keys && auth_key_size) {
 968                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 969                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 970                         sizeof(uint64_t);
 971                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 972                 key->sadb_key_bits = x->aalg->alg_key_len;
 973                 key->sadb_key_reserved = 0;
 974                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 975         }
 976         /* encrypt key */
 977         if (add_keys && encrypt_key_size) {
 978                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 979                 key->sadb_key_len = (sizeof(struct sadb_key) +
 980                                      encrypt_key_size) / sizeof(uint64_t);
 981                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 982                 key->sadb_key_bits = x->ealg->alg_key_len;
 983                 key->sadb_key_reserved = 0;
 984                 memcpy(key + 1, x->ealg->alg_key,
 985                        (x->ealg->alg_key_len+7)/8);
 986         }
 987
 988         /* sa */
 989         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 990         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 991         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 992         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 993                 kfree_skb(skb);
 994                 return ERR_PTR(-EINVAL);
 995         }
 996         sa2->sadb_x_sa2_mode = mode;
 997         sa2->sadb_x_sa2_reserved1 = 0;
 998         sa2->sadb_x_sa2_reserved2 = 0;
 999         sa2->sadb_x_sa2_sequence = 0;
1000         sa2->sadb_x_sa2_reqid = x->props.reqid;
1001
1002         if (natt && natt->encap_type) {
1003                 struct sadb_x_nat_t_type *n_type;
1004                 struct sadb_x_nat_t_port *n_port;
1005
1006                 /* type */
1007                 n_type = skb_put(skb, sizeof(*n_type));
1008                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1009                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1010                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1011                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1012                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1013                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1014
1015                 /* source port */
1016                 n_port = skb_put(skb, sizeof(*n_port));
1017                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1018                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1019                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1020                 n_port->sadb_x_nat_t_port_reserved = 0;
1021
1022                 /* dest port */
1023                 n_port = skb_put(skb, sizeof(*n_port));
1024                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1025                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1026                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1027                 n_port->sadb_x_nat_t_port_reserved = 0;
1028         }
1029
1030         /* security context */
1031         if (xfrm_ctx) {
1032                 sec_ctx = skb_put(skb,
1033                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1034                 sec_ctx->sadb_x_sec_len =
1035                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1036                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1037                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1038                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1039                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1040                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1041                        xfrm_ctx->ctx_len);
1042         }
1043
1044         return skb;
1045 }
1046
1047
1048 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1049 {
1050         struct sk_buff *skb;
1051
1052         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1053
1054         return skb;
1055 }
1056
1057 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1058                                                           int hsc)
1059 {
1060         return __pfkey_xfrm_state2msg(x, 0, hsc);
1061 }
1062
1063 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1064                                                 const struct sadb_msg *hdr,
1065                                                 void * const *ext_hdrs)
1066 {
1067         struct xfrm_state *x;
1068         const struct sadb_lifetime *lifetime;
1069         const struct sadb_sa *sa;
1070         const struct sadb_key *key;
1071         const struct sadb_x_sec_ctx *sec_ctx;
1072         uint16_t proto;
1073         int err;
1074
1075
1076         sa = ext_hdrs[SADB_EXT_SA - 1];
1077         if (!sa ||
1078             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1079                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1080                 return ERR_PTR(-EINVAL);
1081         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1082             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1083                 return ERR_PTR(-EINVAL);
1084         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1085             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1086                 return ERR_PTR(-EINVAL);
1087         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1088             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1089                 return ERR_PTR(-EINVAL);
1090
1091         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1092         if (proto == 0)
1093                 return ERR_PTR(-EINVAL);
1094
1095         /* default error is no buffer space */
1096         err = -ENOBUFS;
1097
1098         /* RFC2367:
1099
1100    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1101    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1102    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1103    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1104    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1105    not true.
1106
1107            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1108            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1109          */
1110         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1111             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1112              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1113             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1114                 return ERR_PTR(-EINVAL);
1115         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1116         if (key != NULL &&
1117             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1118             key->sadb_key_bits == 0)
1119                 return ERR_PTR(-EINVAL);
1120         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1121         if (key != NULL &&
1122             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1123             key->sadb_key_bits == 0)
1124                 return ERR_PTR(-EINVAL);
1125
1126         x = xfrm_state_alloc(net);
1127         if (x == NULL)
1128                 return ERR_PTR(-ENOBUFS);
1129
1130         x->id.proto = proto;
1131         x->id.spi = sa->sadb_sa_spi;
1132         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1133                                         (sizeof(x->replay.bitmap) * 8));
1134         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1135                 x->props.flags |= XFRM_STATE_NOECN;
1136         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1137                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1138         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1139                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1140
1141         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1142         if (lifetime != NULL) {
1143                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1144                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1145                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1146                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1147         }
1148         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1149         if (lifetime != NULL) {
1150                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1151                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1152                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1153                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1154         }
1155
1156         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1157         if (sec_ctx != NULL) {
1158                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1159
1160                 if (!uctx)
1161                         goto out;
1162
1163                 err = security_xfrm_state_alloc(x, uctx);
1164                 kfree(uctx);
1165
1166                 if (err)
1167                         goto out;
1168         }
1169
1170         err = -ENOBUFS;
1171         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1172         if (sa->sadb_sa_auth) {
1173                 int keysize = 0;
1174                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1175                 if (!a || !a->pfkey_supported) {
1176                         err = -ENOSYS;
1177                         goto out;
1178                 }
1179                 if (key)
1180                         keysize = (key->sadb_key_bits + 7) / 8;
1181                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1182                 if (!x->aalg) {
1183                         err = -ENOMEM;
1184                         goto out;
1185                 }
1186                 strcpy(x->aalg->alg_name, a->name);
1187                 x->aalg->alg_key_len = 0;
1188                 if (key) {
1189                         x->aalg->alg_key_len = key->sadb_key_bits;
1190                         memcpy(x->aalg->alg_key, key+1, keysize);
1191                 }
1192                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1193                 x->props.aalgo = sa->sadb_sa_auth;
1194                 /* x->algo.flags = sa->sadb_sa_flags; */
1195         }
1196         if (sa->sadb_sa_encrypt) {
1197                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1198                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1199                         if (!a || !a->pfkey_supported) {
1200                                 err = -ENOSYS;
1201                                 goto out;
1202                         }
1203                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1204                         if (!x->calg) {
1205                                 err = -ENOMEM;
1206                                 goto out;
1207                         }
1208                         strcpy(x->calg->alg_name, a->name);
1209                         x->props.calgo = sa->sadb_sa_encrypt;
1210                 } else {
1211                         int keysize = 0;
1212                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1213                         if (!a || !a->pfkey_supported) {
1214                                 err = -ENOSYS;
1215                                 goto out;
1216                         }
1217                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1218                         if (key)
1219                                 keysize = (key->sadb_key_bits + 7) / 8;
1220                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1221                         if (!x->ealg) {
1222                                 err = -ENOMEM;
1223                                 goto out;
1224                         }
1225                         strcpy(x->ealg->alg_name, a->name);
1226                         x->ealg->alg_key_len = 0;
1227                         if (key) {
1228                                 x->ealg->alg_key_len = key->sadb_key_bits;
1229                                 memcpy(x->ealg->alg_key, key+1, keysize);
1230                         }
1231                         x->props.ealgo = sa->sadb_sa_encrypt;
1232                         x->geniv = a->uinfo.encr.geniv;
1233                 }
1234         }
1235         /* x->algo.flags = sa->sadb_sa_flags; */
1236
1237         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1238                                                     &x->props.saddr);
1239         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1240                                   &x->id.daddr);
1241
1242         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1243                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1244                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1245                 if (mode < 0) {
1246                         err = -EINVAL;
1247                         goto out;
1248                 }
1249                 x->props.mode = mode;
1250                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1251         }
1252
1253         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1254                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1255
1256                 /* Nobody uses this, but we try. */
1257                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1258                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1259         }
1260
1261         if (!x->sel.family)
1262                 x->sel.family = x->props.family;
1263
1264         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1265                 const struct sadb_x_nat_t_type* n_type;
1266                 struct xfrm_encap_tmpl *natt;
1267
1268                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1269                 if (!x->encap) {
1270                         err = -ENOMEM;
1271                         goto out;
1272                 }
1273
1274                 natt = x->encap;
1275                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1276                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1277
1278                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1279                         const struct sadb_x_nat_t_port *n_port =
1280                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1281                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1282                 }
1283                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1284                         const struct sadb_x_nat_t_port *n_port =
1285                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1286                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1287                 }
1288                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1289         }
1290
1291         err = xfrm_init_state(x);
1292         if (err)
1293                 goto out;
1294
1295         x->km.seq = hdr->sadb_msg_seq;
1296         return x;
1297
1298 out:
1299         x->km.state = XFRM_STATE_DEAD;
1300         xfrm_state_put(x);
1301         return ERR_PTR(err);
1302 }
1303
1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1305 {
1306         return -EOPNOTSUPP;
1307 }
1308
1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1310 {
1311         struct net *net = sock_net(sk);
1312         struct sk_buff *resp_skb;
1313         struct sadb_x_sa2 *sa2;
1314         struct sadb_address *saddr, *daddr;
1315         struct sadb_msg *out_hdr;
1316         struct sadb_spirange *range;
1317         struct xfrm_state *x = NULL;
1318         int mode;
1319         int err;
1320         u32 min_spi, max_spi;
1321         u32 reqid;
1322         u8 proto;
1323         unsigned short family;
1324         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1325
1326         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1327                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1328                 return -EINVAL;
1329
1330         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1331         if (proto == 0)
1332                 return -EINVAL;
1333
1334         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1335                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1336                 if (mode < 0)
1337                         return -EINVAL;
1338                 reqid = sa2->sadb_x_sa2_reqid;
1339         } else {
1340                 mode = 0;
1341                 reqid = 0;
1342         }
1343
1344         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1345         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1346
1347         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1348         switch (family) {
1349         case AF_INET:
1350                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1351                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1352                 break;
1353 #if IS_ENABLED(CONFIG_IPV6)
1354         case AF_INET6:
1355                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1356                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1357                 break;
1358 #endif
1359         }
1360
1361         if (hdr->sadb_msg_seq) {
1362                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1363                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1364                         xfrm_state_put(x);
1365                         x = NULL;
1366                 }
1367         }
1368
1369         if (!x)
1370                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family);
1371
1372         if (x == NULL)
1373                 return -ENOENT;
1374
1375         min_spi = 0x100;
1376         max_spi = 0x0fffffff;
1377
1378         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1379         if (range) {
1380                 min_spi = range->sadb_spirange_min;
1381                 max_spi = range->sadb_spirange_max;
1382         }
1383
1384         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1385         if (err) {
1386                 xfrm_state_put(x);
1387                 return err;
1388         }
1389
1390         err = xfrm_alloc_spi(x, min_spi, max_spi);
1391         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1392
1393         if (IS_ERR(resp_skb)) {
1394                 xfrm_state_put(x);
1395                 return  PTR_ERR(resp_skb);
1396         }
1397
1398         out_hdr = (struct sadb_msg *) resp_skb->data;
1399         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1400         out_hdr->sadb_msg_type = SADB_GETSPI;
1401         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1402         out_hdr->sadb_msg_errno = 0;
1403         out_hdr->sadb_msg_reserved = 0;
1404         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1405         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1406
1407         xfrm_state_put(x);
1408
1409         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1410
1411         return 0;
1412 }
1413
1414 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1415 {
1416         struct net *net = sock_net(sk);
1417         struct xfrm_state *x;
1418
1419         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1420                 return -EOPNOTSUPP;
1421
1422         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1423                 return 0;
1424
1425         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1426         if (x == NULL)
1427                 return 0;
1428
1429         spin_lock_bh(&x->lock);
1430         if (x->km.state == XFRM_STATE_ACQ)
1431                 x->km.state = XFRM_STATE_ERROR;
1432
1433         spin_unlock_bh(&x->lock);
1434         xfrm_state_put(x);
1435         return 0;
1436 }
1437
1438 static inline int event2poltype(int event)
1439 {
1440         switch (event) {
1441         case XFRM_MSG_DELPOLICY:
1442                 return SADB_X_SPDDELETE;
1443         case XFRM_MSG_NEWPOLICY:
1444                 return SADB_X_SPDADD;
1445         case XFRM_MSG_UPDPOLICY:
1446                 return SADB_X_SPDUPDATE;
1447         case XFRM_MSG_POLEXPIRE:
1448         //      return SADB_X_SPDEXPIRE;
1449         default:
1450                 pr_err("pfkey: Unknown policy event %d\n", event);
1451                 break;
1452         }
1453
1454         return 0;
1455 }
1456
1457 static inline int event2keytype(int event)
1458 {
1459         switch (event) {
1460         case XFRM_MSG_DELSA:
1461                 return SADB_DELETE;
1462         case XFRM_MSG_NEWSA:
1463                 return SADB_ADD;
1464         case XFRM_MSG_UPDSA:
1465                 return SADB_UPDATE;
1466         case XFRM_MSG_EXPIRE:
1467                 return SADB_EXPIRE;
1468         default:
1469                 pr_err("pfkey: Unknown SA event %d\n", event);
1470                 break;
1471         }
1472
1473         return 0;
1474 }
1475
1476 /* ADD/UPD/DEL */
1477 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1478 {
1479         struct sk_buff *skb;
1480         struct sadb_msg *hdr;
1481
1482         skb = pfkey_xfrm_state2msg(x);
1483
1484         if (IS_ERR(skb))
1485                 return PTR_ERR(skb);
1486
1487         hdr = (struct sadb_msg *) skb->data;
1488         hdr->sadb_msg_version = PF_KEY_V2;
1489         hdr->sadb_msg_type = event2keytype(c->event);
1490         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1491         hdr->sadb_msg_errno = 0;
1492         hdr->sadb_msg_reserved = 0;
1493         hdr->sadb_msg_seq = c->seq;
1494         hdr->sadb_msg_pid = c->portid;
1495
1496         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1497
1498         return 0;
1499 }
1500
1501 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1502 {
1503         struct net *net = sock_net(sk);
1504         struct xfrm_state *x;
1505         int err;
1506         struct km_event c;
1507
1508         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1509         if (IS_ERR(x))
1510                 return PTR_ERR(x);
1511
1512         xfrm_state_hold(x);
1513         if (hdr->sadb_msg_type == SADB_ADD)
1514                 err = xfrm_state_add(x);
1515         else
1516                 err = xfrm_state_update(x);
1517
1518         xfrm_audit_state_add(x, err ? 0 : 1, true);
1519
1520         if (err < 0) {
1521                 x->km.state = XFRM_STATE_DEAD;
1522                 __xfrm_state_put(x);
1523                 goto out;
1524         }
1525
1526         if (hdr->sadb_msg_type == SADB_ADD)
1527                 c.event = XFRM_MSG_NEWSA;
1528         else
1529                 c.event = XFRM_MSG_UPDSA;
1530         c.seq = hdr->sadb_msg_seq;
1531         c.portid = hdr->sadb_msg_pid;
1532         km_state_notify(x, &c);
1533 out:
1534         xfrm_state_put(x);
1535         return err;
1536 }
1537
1538 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1539 {
1540         struct net *net = sock_net(sk);
1541         struct xfrm_state *x;
1542         struct km_event c;
1543         int err;
1544
1545         if (!ext_hdrs[SADB_EXT_SA-1] ||
1546             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548                 return -EINVAL;
1549
1550         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1551         if (x == NULL)
1552                 return -ESRCH;
1553
1554         if ((err = security_xfrm_state_delete(x)))
1555                 goto out;
1556
1557         if (xfrm_state_kern(x)) {
1558                 err = -EPERM;
1559                 goto out;
1560         }
1561
1562         err = xfrm_state_delete(x);
1563
1564         if (err < 0)
1565                 goto out;
1566
1567         c.seq = hdr->sadb_msg_seq;
1568         c.portid = hdr->sadb_msg_pid;
1569         c.event = XFRM_MSG_DELSA;
1570         km_state_notify(x, &c);
1571 out:
1572         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1573         xfrm_state_put(x);
1574
1575         return err;
1576 }
1577
1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1579 {
1580         struct net *net = sock_net(sk);
1581         __u8 proto;
1582         struct sk_buff *out_skb;
1583         struct sadb_msg *out_hdr;
1584         struct xfrm_state *x;
1585
1586         if (!ext_hdrs[SADB_EXT_SA-1] ||
1587             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1588                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1589                 return -EINVAL;
1590
1591         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1592         if (x == NULL)
1593                 return -ESRCH;
1594
1595         out_skb = pfkey_xfrm_state2msg(x);
1596         proto = x->id.proto;
1597         xfrm_state_put(x);
1598         if (IS_ERR(out_skb))
1599                 return  PTR_ERR(out_skb);
1600
1601         out_hdr = (struct sadb_msg *) out_skb->data;
1602         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1603         out_hdr->sadb_msg_type = SADB_GET;
1604         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1605         out_hdr->sadb_msg_errno = 0;
1606         out_hdr->sadb_msg_reserved = 0;
1607         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1608         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1609         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1610
1611         return 0;
1612 }
1613
1614 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1615                                               gfp_t allocation)
1616 {
1617         struct sk_buff *skb;
1618         struct sadb_msg *hdr;
1619         int len, auth_len, enc_len, i;
1620
1621         auth_len = xfrm_count_pfkey_auth_supported();
1622         if (auth_len) {
1623                 auth_len *= sizeof(struct sadb_alg);
1624                 auth_len += sizeof(struct sadb_supported);
1625         }
1626
1627         enc_len = xfrm_count_pfkey_enc_supported();
1628         if (enc_len) {
1629                 enc_len *= sizeof(struct sadb_alg);
1630                 enc_len += sizeof(struct sadb_supported);
1631         }
1632
1633         len = enc_len + auth_len + sizeof(struct sadb_msg);
1634
1635         skb = alloc_skb(len + 16, allocation);
1636         if (!skb)
1637                 goto out_put_algs;
1638
1639         hdr = skb_put(skb, sizeof(*hdr));
1640         pfkey_hdr_dup(hdr, orig);
1641         hdr->sadb_msg_errno = 0;
1642         hdr->sadb_msg_len = len / sizeof(uint64_t);
1643
1644         if (auth_len) {
1645                 struct sadb_supported *sp;
1646                 struct sadb_alg *ap;
1647
1648                 sp = skb_put(skb, auth_len);
1649                 ap = (struct sadb_alg *) (sp + 1);
1650
1651                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1652                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1653
1654                 for (i = 0; ; i++) {
1655                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1656                         if (!aalg)
1657                                 break;
1658                         if (!aalg->pfkey_supported)
1659                                 continue;
1660                         if (aalg->available)
1661                                 *ap++ = aalg->desc;
1662                 }
1663         }
1664
1665         if (enc_len) {
1666                 struct sadb_supported *sp;
1667                 struct sadb_alg *ap;
1668
1669                 sp = skb_put(skb, enc_len);
1670                 ap = (struct sadb_alg *) (sp + 1);
1671
1672                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1673                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1674
1675                 for (i = 0; ; i++) {
1676                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1677                         if (!ealg)
1678                                 break;
1679                         if (!ealg->pfkey_supported)
1680                                 continue;
1681                         if (ealg->available)
1682                                 *ap++ = ealg->desc;
1683                 }
1684         }
1685
1686 out_put_algs:
1687         return skb;
1688 }
1689
1690 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1691 {
1692         struct pfkey_sock *pfk = pfkey_sk(sk);
1693         struct sk_buff *supp_skb;
1694
1695         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1696                 return -EINVAL;
1697
1698         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1699                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1700                         return -EEXIST;
1701                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1702         }
1703
1704         mutex_lock(&pfkey_mutex);
1705         xfrm_probe_algs();
1706
1707         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1708         mutex_unlock(&pfkey_mutex);
1709
1710         if (!supp_skb) {
1711                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1712                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1713
1714                 return -ENOBUFS;
1715         }
1716
1717         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1718                         sock_net(sk));
1719         return 0;
1720 }
1721
1722 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1723 {
1724         struct sk_buff *skb;
1725         struct sadb_msg *hdr;
1726
1727         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1728         if (!skb)
1729                 return -ENOBUFS;
1730
1731         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1732         hdr->sadb_msg_errno = (uint8_t) 0;
1733         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1734
1735         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1736                                sock_net(sk));
1737 }
1738
1739 static int key_notify_sa_flush(const struct km_event *c)
1740 {
1741         struct sk_buff *skb;
1742         struct sadb_msg *hdr;
1743
1744         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1745         if (!skb)
1746                 return -ENOBUFS;
1747         hdr = skb_put(skb, sizeof(struct sadb_msg));
1748         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1749         hdr->sadb_msg_type = SADB_FLUSH;
1750         hdr->sadb_msg_seq = c->seq;
1751         hdr->sadb_msg_pid = c->portid;
1752         hdr->sadb_msg_version = PF_KEY_V2;
1753         hdr->sadb_msg_errno = (uint8_t) 0;
1754         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1755         hdr->sadb_msg_reserved = 0;
1756
1757         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1758
1759         return 0;
1760 }
1761
1762 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1763 {
1764         struct net *net = sock_net(sk);
1765         unsigned int proto;
1766         struct km_event c;
1767         int err, err2;
1768
1769         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1770         if (proto == 0)
1771                 return -EINVAL;
1772
1773         err = xfrm_state_flush(net, proto, true, false);
1774         err2 = unicast_flush_resp(sk, hdr);
1775         if (err || err2) {
1776                 if (err == -ESRCH) /* empty table - go quietly */
1777                         err = 0;
1778                 return err ? err : err2;
1779         }
1780
1781         c.data.proto = proto;
1782         c.seq = hdr->sadb_msg_seq;
1783         c.portid = hdr->sadb_msg_pid;
1784         c.event = XFRM_MSG_FLUSHSA;
1785         c.net = net;
1786         km_state_notify(NULL, &c);
1787
1788         return 0;
1789 }
1790
1791 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1792 {
1793         struct pfkey_sock *pfk = ptr;
1794         struct sk_buff *out_skb;
1795         struct sadb_msg *out_hdr;
1796
1797         if (!pfkey_can_dump(&pfk->sk))
1798                 return -ENOBUFS;
1799
1800         out_skb = pfkey_xfrm_state2msg(x);
1801         if (IS_ERR(out_skb))
1802                 return PTR_ERR(out_skb);
1803
1804         out_hdr = (struct sadb_msg *) out_skb->data;
1805         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1806         out_hdr->sadb_msg_type = SADB_DUMP;
1807         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1808         out_hdr->sadb_msg_errno = 0;
1809         out_hdr->sadb_msg_reserved = 0;
1810         out_hdr->sadb_msg_seq = count + 1;
1811         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1812
1813         if (pfk->dump.skb)
1814                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1815                                 &pfk->sk, sock_net(&pfk->sk));
1816         pfk->dump.skb = out_skb;
1817
1818         return 0;
1819 }
1820
1821 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1822 {
1823         struct net *net = sock_net(&pfk->sk);
1824         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1825 }
1826
1827 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1828 {
1829         struct net *net = sock_net(&pfk->sk);
1830
1831         xfrm_state_walk_done(&pfk->dump.u.state, net);
1832 }
1833
1834 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1835 {
1836         u8 proto;
1837         struct xfrm_address_filter *filter = NULL;
1838         struct pfkey_sock *pfk = pfkey_sk(sk);
1839
1840         mutex_lock(&pfk->dump_lock);
1841         if (pfk->dump.dump != NULL) {
1842                 mutex_unlock(&pfk->dump_lock);
1843                 return -EBUSY;
1844         }
1845
1846         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1847         if (proto == 0) {
1848                 mutex_unlock(&pfk->dump_lock);
1849                 return -EINVAL;
1850         }
1851
1852         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1853                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1854
1855                 if ((xfilter->sadb_x_filter_splen >=
1856                         (sizeof(xfrm_address_t) << 3)) ||
1857                     (xfilter->sadb_x_filter_dplen >=
1858                         (sizeof(xfrm_address_t) << 3))) {
1859                         mutex_unlock(&pfk->dump_lock);
1860                         return -EINVAL;
1861                 }
1862                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1863                 if (filter == NULL) {
1864                         mutex_unlock(&pfk->dump_lock);
1865                         return -ENOMEM;
1866                 }
1867
1868                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1869                        sizeof(xfrm_address_t));
1870                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1871                        sizeof(xfrm_address_t));
1872                 filter->family = xfilter->sadb_x_filter_family;
1873                 filter->splen = xfilter->sadb_x_filter_splen;
1874                 filter->dplen = xfilter->sadb_x_filter_dplen;
1875         }
1876
1877         pfk->dump.msg_version = hdr->sadb_msg_version;
1878         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1879         pfk->dump.dump = pfkey_dump_sa;
1880         pfk->dump.done = pfkey_dump_sa_done;
1881         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1882         mutex_unlock(&pfk->dump_lock);
1883
1884         return pfkey_do_dump(pfk);
1885 }
1886
1887 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1888 {
1889         struct pfkey_sock *pfk = pfkey_sk(sk);
1890         int satype = hdr->sadb_msg_satype;
1891         bool reset_errno = false;
1892
1893         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1894                 reset_errno = true;
1895                 if (satype != 0 && satype != 1)
1896                         return -EINVAL;
1897                 pfk->promisc = satype;
1898         }
1899         if (reset_errno && skb_cloned(skb))
1900                 skb = skb_copy(skb, GFP_KERNEL);
1901         else
1902                 skb = skb_clone(skb, GFP_KERNEL);
1903
1904         if (reset_errno && skb) {
1905                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1906                 new_hdr->sadb_msg_errno = 0;
1907         }
1908
1909         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1910         return 0;
1911 }
1912
1913 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1914 {
1915         int i;
1916         u32 reqid = *(u32*)ptr;
1917
1918         for (i=0; i<xp->xfrm_nr; i++) {
1919                 if (xp->xfrm_vec[i].reqid == reqid)
1920                         return -EEXIST;
1921         }
1922         return 0;
1923 }
1924
1925 static u32 gen_reqid(struct net *net)
1926 {
1927         struct xfrm_policy_walk walk;
1928         u32 start;
1929         int rc;
1930         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1931
1932         start = reqid;
1933         do {
1934                 ++reqid;
1935                 if (reqid == 0)
1936                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1937                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1938                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1939                 xfrm_policy_walk_done(&walk, net);
1940                 if (rc != -EEXIST)
1941                         return reqid;
1942         } while (reqid != start);
1943         return 0;
1944 }
1945
1946 static int
1947 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1948 {
1949         struct net *net = xp_net(xp);
1950         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1951         int mode;
1952
1953         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1954                 return -ELOOP;
1955
1956         if (rq->sadb_x_ipsecrequest_mode == 0)
1957                 return -EINVAL;
1958         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1959                 return -EINVAL;
1960
1961         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1962         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1963                 return -EINVAL;
1964         t->mode = mode;
1965         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1966                 t->optional = 1;
1967         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1968                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1969                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1970                         t->reqid = 0;
1971                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1972                         return -ENOBUFS;
1973         }
1974
1975         /* addresses present only in tunnel mode */
1976         if (t->mode == XFRM_MODE_TUNNEL) {
1977                 int err;
1978
1979                 err = parse_sockaddr_pair(
1980                         (struct sockaddr *)(rq + 1),
1981                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1982                         &t->saddr, &t->id.daddr, &t->encap_family);
1983                 if (err)
1984                         return err;
1985         } else
1986                 t->encap_family = xp->family;
1987
1988         /* No way to set this via kame pfkey */
1989         t->allalgs = 1;
1990         xp->xfrm_nr++;
1991         return 0;
1992 }
1993
1994 static int
1995 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1996 {
1997         int err;
1998         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1999         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2000
2001         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2002                 return -EINVAL;
2003
2004         while (len >= sizeof(*rq)) {
2005                 if (len < rq->sadb_x_ipsecrequest_len ||
2006                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2007                         return -EINVAL;
2008
2009                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2010                         return err;
2011                 len -= rq->sadb_x_ipsecrequest_len;
2012                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2013         }
2014         return 0;
2015 }
2016
2017 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2018 {
2019         struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2020
2021         if (xfrm_ctx) {
2022                 int len = sizeof(struct sadb_x_sec_ctx);
2023                 len += xfrm_ctx->ctx_len;
2024                 return PFKEY_ALIGN8(len);
2025         }
2026         return 0;
2027 }
2028
2029 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2030 {
2031         const struct xfrm_tmpl *t;
2032         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2033         int socklen = 0;
2034         int i;
2035
2036         for (i=0; i<xp->xfrm_nr; i++) {
2037                 t = xp->xfrm_vec + i;
2038                 socklen += pfkey_sockaddr_len(t->encap_family);
2039         }
2040
2041         return sizeof(struct sadb_msg) +
2042                 (sizeof(struct sadb_lifetime) * 3) +
2043                 (sizeof(struct sadb_address) * 2) +
2044                 (sockaddr_size * 2) +
2045                 sizeof(struct sadb_x_policy) +
2046                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2047                 (socklen * 2) +
2048                 pfkey_xfrm_policy2sec_ctx_size(xp);
2049 }
2050
2051 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2052 {
2053         struct sk_buff *skb;
2054         int size;
2055
2056         size = pfkey_xfrm_policy2msg_size(xp);
2057
2058         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2059         if (skb == NULL)
2060                 return ERR_PTR(-ENOBUFS);
2061
2062         return skb;
2063 }
2064
2065 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2066 {
2067         struct sadb_msg *hdr;
2068         struct sadb_address *addr;
2069         struct sadb_lifetime *lifetime;
2070         struct sadb_x_policy *pol;
2071         struct sadb_x_sec_ctx *sec_ctx;
2072         struct xfrm_sec_ctx *xfrm_ctx;
2073         int i;
2074         int size;
2075         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2076         int socklen = pfkey_sockaddr_len(xp->family);
2077
2078         size = pfkey_xfrm_policy2msg_size(xp);
2079
2080         /* call should fill header later */
2081         hdr = skb_put(skb, sizeof(struct sadb_msg));
2082         memset(hdr, 0, size);   /* XXX do we need this ? */
2083
2084         /* src address */
2085         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2086         addr->sadb_address_len =
2087                 (sizeof(struct sadb_address)+sockaddr_size)/
2088                         sizeof(uint64_t);
2089         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2090         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2091         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2092         addr->sadb_address_reserved = 0;
2093         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2094                                  xp->selector.sport,
2095                                  (struct sockaddr *) (addr + 1),
2096                                  xp->family))
2097                 BUG();
2098
2099         /* dst address */
2100         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2101         addr->sadb_address_len =
2102                 (sizeof(struct sadb_address)+sockaddr_size)/
2103                         sizeof(uint64_t);
2104         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2105         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2106         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2107         addr->sadb_address_reserved = 0;
2108
2109         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2110                             (struct sockaddr *) (addr + 1),
2111                             xp->family);
2112
2113         /* hard time */
2114         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2115         lifetime->sadb_lifetime_len =
2116                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2117         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2118         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2119         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2120         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2121         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2122         /* soft time */
2123         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2124         lifetime->sadb_lifetime_len =
2125                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2126         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2127         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2128         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2129         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2130         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2131         /* current time */
2132         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2133         lifetime->sadb_lifetime_len =
2134                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2135         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2136         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2137         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2138         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2139         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2140
2141         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2142         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2143         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2144         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2145         if (xp->action == XFRM_POLICY_ALLOW) {
2146                 if (xp->xfrm_nr)
2147                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2148                 else
2149                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2150         }
2151         pol->sadb_x_policy_dir = dir+1;
2152         pol->sadb_x_policy_reserved = 0;
2153         pol->sadb_x_policy_id = xp->index;
2154         pol->sadb_x_policy_priority = xp->priority;
2155
2156         for (i=0; i<xp->xfrm_nr; i++) {
2157                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2158                 struct sadb_x_ipsecrequest *rq;
2159                 int req_size;
2160                 int mode;
2161
2162                 req_size = sizeof(struct sadb_x_ipsecrequest);
2163                 if (t->mode == XFRM_MODE_TUNNEL) {
2164                         socklen = pfkey_sockaddr_len(t->encap_family);
2165                         req_size += socklen * 2;
2166                 } else {
2167                         size -= 2*socklen;
2168                 }
2169                 rq = skb_put(skb, req_size);
2170                 pol->sadb_x_policy_len += req_size/8;
2171                 memset(rq, 0, sizeof(*rq));
2172                 rq->sadb_x_ipsecrequest_len = req_size;
2173                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2174                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2175                         return -EINVAL;
2176                 rq->sadb_x_ipsecrequest_mode = mode;
2177                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2178                 if (t->reqid)
2179                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2180                 if (t->optional)
2181                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2182                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2183
2184                 if (t->mode == XFRM_MODE_TUNNEL) {
2185                         u8 *sa = (void *)(rq + 1);
2186                         pfkey_sockaddr_fill(&t->saddr, 0,
2187                                             (struct sockaddr *)sa,
2188                                             t->encap_family);
2189                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2190                                             (struct sockaddr *) (sa + socklen),
2191                                             t->encap_family);
2192                 }
2193         }
2194
2195         /* security context */
2196         if ((xfrm_ctx = xp->security)) {
2197                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2198
2199                 sec_ctx = skb_put(skb, ctx_size);
2200                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2201                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2202                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2203                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2204                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2205                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2206                        xfrm_ctx->ctx_len);
2207         }
2208
2209         hdr->sadb_msg_len = size / sizeof(uint64_t);
2210         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2211
2212         return 0;
2213 }
2214
2215 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2216 {
2217         struct sk_buff *out_skb;
2218         struct sadb_msg *out_hdr;
2219         int err;
2220
2221         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2222         if (IS_ERR(out_skb))
2223                 return PTR_ERR(out_skb);
2224
2225         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2226         if (err < 0) {
2227                 kfree_skb(out_skb);
2228                 return err;
2229         }
2230
2231         out_hdr = (struct sadb_msg *) out_skb->data;
2232         out_hdr->sadb_msg_version = PF_KEY_V2;
2233
2234         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2235                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2236         else
2237                 out_hdr->sadb_msg_type = event2poltype(c->event);
2238         out_hdr->sadb_msg_errno = 0;
2239         out_hdr->sadb_msg_seq = c->seq;
2240         out_hdr->sadb_msg_pid = c->portid;
2241         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2242         return 0;
2243
2244 }
2245
2246 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2247 {
2248         struct net *net = sock_net(sk);
2249         int err = 0;
2250         struct sadb_lifetime *lifetime;
2251         struct sadb_address *sa;
2252         struct sadb_x_policy *pol;
2253         struct xfrm_policy *xp;
2254         struct km_event c;
2255         struct sadb_x_sec_ctx *sec_ctx;
2256
2257         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2258                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2259             !ext_hdrs[SADB_X_EXT_POLICY-1])
2260                 return -EINVAL;
2261
2262         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2263         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2264                 return -EINVAL;
2265         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2266                 return -EINVAL;
2267
2268         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2269         if (xp == NULL)
2270                 return -ENOBUFS;
2271
2272         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2273                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2274         xp->priority = pol->sadb_x_policy_priority;
2275
2276         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2277         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2278         xp->selector.family = xp->family;
2279         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2280         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2281         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2282         if (xp->selector.sport)
2283                 xp->selector.sport_mask = htons(0xffff);
2284
2285         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2286         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2287         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2288
2289         /* Amusing, we set this twice.  KAME apps appear to set same value
2290          * in both addresses.
2291          */
2292         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2293
2294         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2295         if (xp->selector.dport)
2296                 xp->selector.dport_mask = htons(0xffff);
2297
2298         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2299         if (sec_ctx != NULL) {
2300                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2301
2302                 if (!uctx) {
2303                         err = -ENOBUFS;
2304                         goto out;
2305                 }
2306
2307                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2308                 kfree(uctx);
2309
2310                 if (err)
2311                         goto out;
2312         }
2313
2314         xp->lft.soft_byte_limit = XFRM_INF;
2315         xp->lft.hard_byte_limit = XFRM_INF;
2316         xp->lft.soft_packet_limit = XFRM_INF;
2317         xp->lft.hard_packet_limit = XFRM_INF;
2318         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2319                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2320                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2321                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2322                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2323         }
2324         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2325                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2326                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2327                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2328                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2329         }
2330         xp->xfrm_nr = 0;
2331         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2332             (err = parse_ipsecrequests(xp, pol)) < 0)
2333                 goto out;
2334
2335         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2336                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2337
2338         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2339
2340         if (err)
2341                 goto out;
2342
2343         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2344                 c.event = XFRM_MSG_UPDPOLICY;
2345         else
2346                 c.event = XFRM_MSG_NEWPOLICY;
2347
2348         c.seq = hdr->sadb_msg_seq;
2349         c.portid = hdr->sadb_msg_pid;
2350
2351         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2352         xfrm_pol_put(xp);
2353         return 0;
2354
2355 out:
2356         xp->walk.dead = 1;
2357         xfrm_policy_destroy(xp);
2358         return err;
2359 }
2360
2361 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2362 {
2363         struct net *net = sock_net(sk);
2364         int err;
2365         struct sadb_address *sa;
2366         struct sadb_x_policy *pol;
2367         struct xfrm_policy *xp;
2368         struct xfrm_selector sel;
2369         struct km_event c;
2370         struct sadb_x_sec_ctx *sec_ctx;
2371         struct xfrm_sec_ctx *pol_ctx = NULL;
2372
2373         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2374                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2375             !ext_hdrs[SADB_X_EXT_POLICY-1])
2376                 return -EINVAL;
2377
2378         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2379         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2380                 return -EINVAL;
2381
2382         memset(&sel, 0, sizeof(sel));
2383
2384         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2385         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2386         sel.prefixlen_s = sa->sadb_address_prefixlen;
2387         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2388         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2389         if (sel.sport)
2390                 sel.sport_mask = htons(0xffff);
2391
2392         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2393         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2394         sel.prefixlen_d = sa->sadb_address_prefixlen;
2395         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2396         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2397         if (sel.dport)
2398                 sel.dport_mask = htons(0xffff);
2399
2400         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2401         if (sec_ctx != NULL) {
2402                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2403
2404                 if (!uctx)
2405                         return -ENOMEM;
2406
2407                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2408                 kfree(uctx);
2409                 if (err)
2410                         return err;
2411         }
2412
2413         xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2414                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2415                                    1, &err);
2416         security_xfrm_policy_free(pol_ctx);
2417         if (xp == NULL)
2418                 return -ENOENT;
2419
2420         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2421
2422         if (err)
2423                 goto out;
2424
2425         c.seq = hdr->sadb_msg_seq;
2426         c.portid = hdr->sadb_msg_pid;
2427         c.data.byid = 0;
2428         c.event = XFRM_MSG_DELPOLICY;
2429         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2430
2431 out:
2432         xfrm_pol_put(xp);
2433         return err;
2434 }
2435
2436 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2437 {
2438         int err;
2439         struct sk_buff *out_skb;
2440         struct sadb_msg *out_hdr;
2441         err = 0;
2442
2443         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2444         if (IS_ERR(out_skb)) {
2445                 err =  PTR_ERR(out_skb);
2446                 goto out;
2447         }
2448         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2449         if (err < 0) {
2450                 kfree_skb(out_skb);
2451                 goto out;
2452         }
2453
2454         out_hdr = (struct sadb_msg *) out_skb->data;
2455         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2456         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2457         out_hdr->sadb_msg_satype = 0;
2458         out_hdr->sadb_msg_errno = 0;
2459         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2460         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2461         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2462         err = 0;
2463
2464 out:
2465         return err;
2466 }
2467
2468 static int pfkey_sockaddr_pair_size(sa_family_t family)
2469 {
2470         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2471 }
2472
2473 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2474                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2475                                u16 *family)
2476 {
2477         int af, socklen;
2478
2479         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2480                 return -EINVAL;
2481
2482         af = pfkey_sockaddr_extract(sa, saddr);
2483         if (!af)
2484                 return -EINVAL;
2485
2486         socklen = pfkey_sockaddr_len(af);
2487         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2488                                    daddr) != af)
2489                 return -EINVAL;
2490
2491         *family = af;
2492         return 0;
2493 }
2494
2495 #ifdef CONFIG_NET_KEY_MIGRATE
2496 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2497                                     struct xfrm_migrate *m)
2498 {
2499         int err;
2500         struct sadb_x_ipsecrequest *rq2;
2501         int mode;
2502
2503         if (len < sizeof(*rq1) ||
2504             len < rq1->sadb_x_ipsecrequest_len ||
2505             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2506                 return -EINVAL;
2507
2508         /* old endoints */
2509         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2510                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2511                                   &m->old_saddr, &m->old_daddr,
2512                                   &m->old_family);
2513         if (err)
2514                 return err;
2515
2516         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2517         len -= rq1->sadb_x_ipsecrequest_len;
2518
2519         if (len <= sizeof(*rq2) ||
2520             len < rq2->sadb_x_ipsecrequest_len ||
2521             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2522                 return -EINVAL;
2523
2524         /* new endpoints */
2525         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2526                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2527                                   &m->new_saddr, &m->new_daddr,
2528                                   &m->new_family);
2529         if (err)
2530                 return err;
2531
2532         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2533             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2534             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2535                 return -EINVAL;
2536
2537         m->proto = rq1->sadb_x_ipsecrequest_proto;
2538         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2539                 return -EINVAL;
2540         m->mode = mode;
2541         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2542
2543         return ((int)(rq1->sadb_x_ipsecrequest_len +
2544                       rq2->sadb_x_ipsecrequest_len));
2545 }
2546
2547 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2548                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2549 {
2550         int i, len, ret, err = -EINVAL;
2551         u8 dir;
2552         struct sadb_address *sa;
2553         struct sadb_x_kmaddress *kma;
2554         struct sadb_x_policy *pol;
2555         struct sadb_x_ipsecrequest *rq;
2556         struct xfrm_selector sel;
2557         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2558         struct xfrm_kmaddress k;
2559         struct net *net = sock_net(sk);
2560
2561         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2562                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2563             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2564                 err = -EINVAL;
2565                 goto out;
2566         }
2567
2568         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2569         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2570
2571         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2572                 err = -EINVAL;
2573                 goto out;
2574         }
2575
2576         if (kma) {
2577                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2578                 k.reserved = kma->sadb_x_kmaddress_reserved;
2579                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2580                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2581                                           &k.local, &k.remote, &k.family);
2582                 if (ret < 0) {
2583                         err = ret;
2584                         goto out;
2585                 }
2586         }
2587
2588         dir = pol->sadb_x_policy_dir - 1;
2589         memset(&sel, 0, sizeof(sel));
2590
2591         /* set source address info of selector */
2592         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2593         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2594         sel.prefixlen_s = sa->sadb_address_prefixlen;
2595         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2596         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2597         if (sel.sport)
2598                 sel.sport_mask = htons(0xffff);
2599
2600         /* set destination address info of selector */
2601         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2602         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2603         sel.prefixlen_d = sa->sadb_address_prefixlen;
2604         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2605         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2606         if (sel.dport)
2607                 sel.dport_mask = htons(0xffff);
2608
2609         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2610
2611         /* extract ipsecrequests */
2612         i = 0;
2613         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2614
2615         while (len > 0 && i < XFRM_MAX_DEPTH) {
2616                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2617                 if (ret < 0) {
2618                         err = ret;
2619                         goto out;
2620                 } else {
2621                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2622                         len -= ret;
2623                         i++;
2624                 }
2625         }
2626
2627         if (!i || len > 0) {
2628                 err = -EINVAL;
2629                 goto out;
2630         }
2631
2632         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2633                             kma ? &k : NULL, net, NULL, 0);
2634
2635  out:
2636         return err;
2637 }
2638 #else
2639 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2640                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2641 {
2642         return -ENOPROTOOPT;
2643 }
2644 #endif
2645
2646
2647 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2648 {
2649         struct net *net = sock_net(sk);
2650         unsigned int dir;
2651         int err = 0, delete;
2652         struct sadb_x_policy *pol;
2653         struct xfrm_policy *xp;
2654         struct km_event c;
2655
2656         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2657                 return -EINVAL;
2658
2659         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2660         if (dir >= XFRM_POLICY_MAX)
2661                 return -EINVAL;
2662
2663         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2664         xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN,
2665                               dir, pol->sadb_x_policy_id, delete, &err);
2666         if (xp == NULL)
2667                 return -ENOENT;
2668
2669         if (delete) {
2670                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2671
2672                 if (err)
2673                         goto out;
2674                 c.seq = hdr->sadb_msg_seq;
2675                 c.portid = hdr->sadb_msg_pid;
2676                 c.data.byid = 1;
2677                 c.event = XFRM_MSG_DELPOLICY;
2678                 km_policy_notify(xp, dir, &c);
2679         } else {
2680                 err = key_pol_get_resp(sk, xp, hdr, dir);
2681         }
2682
2683 out:
2684         xfrm_pol_put(xp);
2685         return err;
2686 }
2687
2688 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2689 {
2690         struct pfkey_sock *pfk = ptr;
2691         struct sk_buff *out_skb;
2692         struct sadb_msg *out_hdr;
2693         int err;
2694
2695         if (!pfkey_can_dump(&pfk->sk))
2696                 return -ENOBUFS;
2697
2698         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2699         if (IS_ERR(out_skb))
2700                 return PTR_ERR(out_skb);
2701
2702         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2703         if (err < 0) {
2704                 kfree_skb(out_skb);
2705                 return err;
2706         }
2707
2708         out_hdr = (struct sadb_msg *) out_skb->data;
2709         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2710         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2711         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2712         out_hdr->sadb_msg_errno = 0;
2713         out_hdr->sadb_msg_seq = count + 1;
2714         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2715
2716         if (pfk->dump.skb)
2717                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2718                                 &pfk->sk, sock_net(&pfk->sk));
2719         pfk->dump.skb = out_skb;
2720
2721         return 0;
2722 }
2723
2724 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2725 {
2726         struct net *net = sock_net(&pfk->sk);
2727         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2728 }
2729
2730 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2731 {
2732         struct net *net = sock_net((struct sock *)pfk);
2733
2734         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2735 }
2736
2737 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2738 {
2739         struct pfkey_sock *pfk = pfkey_sk(sk);
2740
2741         mutex_lock(&pfk->dump_lock);
2742         if (pfk->dump.dump != NULL) {
2743                 mutex_unlock(&pfk->dump_lock);
2744                 return -EBUSY;
2745         }
2746
2747         pfk->dump.msg_version = hdr->sadb_msg_version;
2748         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2749         pfk->dump.dump = pfkey_dump_sp;
2750         pfk->dump.done = pfkey_dump_sp_done;
2751         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2752         mutex_unlock(&pfk->dump_lock);
2753
2754         return pfkey_do_dump(pfk);
2755 }
2756
2757 static int key_notify_policy_flush(const struct km_event *c)
2758 {
2759         struct sk_buff *skb_out;
2760         struct sadb_msg *hdr;
2761
2762         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2763         if (!skb_out)
2764                 return -ENOBUFS;
2765         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2766         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2767         hdr->sadb_msg_seq = c->seq;
2768         hdr->sadb_msg_pid = c->portid;
2769         hdr->sadb_msg_version = PF_KEY_V2;
2770         hdr->sadb_msg_errno = (uint8_t) 0;
2771         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2772         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2773         hdr->sadb_msg_reserved = 0;
2774         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2775         return 0;
2776
2777 }
2778
2779 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2780 {
2781         struct net *net = sock_net(sk);
2782         struct km_event c;
2783         int err, err2;
2784
2785         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2786         err2 = unicast_flush_resp(sk, hdr);
2787         if (err || err2) {
2788                 if (err == -ESRCH) /* empty table - old silent behavior */
2789                         return 0;
2790                 return err;
2791         }
2792
2793         c.data.type = XFRM_POLICY_TYPE_MAIN;
2794         c.event = XFRM_MSG_FLUSHPOLICY;
2795         c.portid = hdr->sadb_msg_pid;
2796         c.seq = hdr->sadb_msg_seq;
2797         c.net = net;
2798         km_policy_notify(NULL, 0, &c);
2799
2800         return 0;
2801 }
2802
2803 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2804                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2805 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2806         [SADB_RESERVED]         = pfkey_reserved,
2807         [SADB_GETSPI]           = pfkey_getspi,
2808         [SADB_UPDATE]           = pfkey_add,
2809         [SADB_ADD]              = pfkey_add,
2810         [SADB_DELETE]           = pfkey_delete,
2811         [SADB_GET]              = pfkey_get,
2812         [SADB_ACQUIRE]          = pfkey_acquire,
2813         [SADB_REGISTER]         = pfkey_register,
2814         [SADB_EXPIRE]           = NULL,
2815         [SADB_FLUSH]            = pfkey_flush,
2816         [SADB_DUMP]             = pfkey_dump,
2817         [SADB_X_PROMISC]        = pfkey_promisc,
2818         [SADB_X_PCHANGE]        = NULL,
2819         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2820         [SADB_X_SPDADD]         = pfkey_spdadd,
2821         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2822         [SADB_X_SPDGET]         = pfkey_spdget,
2823         [SADB_X_SPDACQUIRE]     = NULL,
2824         [SADB_X_SPDDUMP]        = pfkey_spddump,
2825         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2826         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2827         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2828         [SADB_X_MIGRATE]        = pfkey_migrate,
2829 };
2830
2831 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2832 {
2833         void *ext_hdrs[SADB_EXT_MAX];
2834         int err;
2835
2836         /* Non-zero return value of pfkey_broadcast() does not always signal
2837          * an error and even on an actual error we may still want to process
2838          * the message so rather ignore the return value.
2839          */
2840         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2841                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2842
2843         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2844         err = parse_exthdrs(skb, hdr, ext_hdrs);
2845         if (!err) {
2846                 err = -EOPNOTSUPP;
2847                 if (pfkey_funcs[hdr->sadb_msg_type])
2848                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2849         }
2850         return err;
2851 }
2852
2853 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2854 {
2855         struct sadb_msg *hdr = NULL;
2856
2857         if (skb->len < sizeof(*hdr)) {
2858                 *errp = -EMSGSIZE;
2859         } else {
2860                 hdr = (struct sadb_msg *) skb->data;
2861                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2862                     hdr->sadb_msg_reserved != 0 ||
2863                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2864                      hdr->sadb_msg_type > SADB_MAX)) {
2865                         hdr = NULL;
2866                         *errp = -EINVAL;
2867                 } else if (hdr->sadb_msg_len != (skb->len /
2868                                                  sizeof(uint64_t)) ||
2869                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2870                                                 sizeof(uint64_t))) {
2871                         hdr = NULL;
2872                         *errp = -EMSGSIZE;
2873                 } else {
2874                         *errp = 0;
2875                 }
2876         }
2877         return hdr;
2878 }
2879
2880 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2881                                 const struct xfrm_algo_desc *d)
2882 {
2883         unsigned int id = d->desc.sadb_alg_id;
2884
2885         if (id >= sizeof(t->aalgos) * 8)
2886                 return 0;
2887
2888         return (t->aalgos >> id) & 1;
2889 }
2890
2891 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2892                                 const struct xfrm_algo_desc *d)
2893 {
2894         unsigned int id = d->desc.sadb_alg_id;
2895
2896         if (id >= sizeof(t->ealgos) * 8)
2897                 return 0;
2898
2899         return (t->ealgos >> id) & 1;
2900 }
2901
2902 static int count_ah_combs(const struct xfrm_tmpl *t)
2903 {
2904         int i, sz = 0;
2905
2906         for (i = 0; ; i++) {
2907                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2908                 if (!aalg)
2909                         break;
2910                 if (!aalg->pfkey_supported)
2911                         continue;
2912                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2913                         sz += sizeof(struct sadb_comb);
2914         }
2915         return sz + sizeof(struct sadb_prop);
2916 }
2917
2918 static int count_esp_combs(const struct xfrm_tmpl *t)
2919 {
2920         int i, k, sz = 0;
2921
2922         for (i = 0; ; i++) {
2923                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2924                 if (!ealg)
2925                         break;
2926
2927                 if (!ealg->pfkey_supported)
2928                         continue;
2929
2930                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2931                         continue;
2932
2933                 for (k = 1; ; k++) {
2934                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2935                         if (!aalg)
2936                                 break;
2937
2938                         if (!aalg->pfkey_supported)
2939                                 continue;
2940
2941                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2942                                 sz += sizeof(struct sadb_comb);
2943                 }
2944         }
2945         return sz + sizeof(struct sadb_prop);
2946 }
2947
2948 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2949 {
2950         struct sadb_prop *p;
2951         int i;
2952
2953         p = skb_put(skb, sizeof(struct sadb_prop));
2954         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2955         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2956         p->sadb_prop_replay = 32;
2957         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2958
2959         for (i = 0; ; i++) {
2960                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2961                 if (!aalg)
2962                         break;
2963
2964                 if (!aalg->pfkey_supported)
2965                         continue;
2966
2967                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2968                         struct sadb_comb *c;
2969                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2970                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2971                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2972                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2973                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2974                         c->sadb_comb_hard_addtime = 24*60*60;
2975                         c->sadb_comb_soft_addtime = 20*60*60;
2976                         c->sadb_comb_hard_usetime = 8*60*60;
2977                         c->sadb_comb_soft_usetime = 7*60*60;
2978                 }
2979         }
2980 }
2981
2982 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2983 {
2984         struct sadb_prop *p;
2985         int i, k;
2986
2987         p = skb_put(skb, sizeof(struct sadb_prop));
2988         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2989         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2990         p->sadb_prop_replay = 32;
2991         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2992
2993         for (i=0; ; i++) {
2994                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2995                 if (!ealg)
2996                         break;
2997
2998                 if (!ealg->pfkey_supported)
2999                         continue;
3000
3001                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3002                         continue;
3003
3004                 for (k = 1; ; k++) {
3005                         struct sadb_comb *c;
3006                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3007                         if (!aalg)
3008                                 break;
3009                         if (!aalg->pfkey_supported)
3010                                 continue;
3011                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3012                                 continue;
3013                         c = skb_put(skb, sizeof(struct sadb_comb));
3014                         memset(c, 0, sizeof(*c));
3015                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3016                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3017                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3018                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3019                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3020                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3021                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3022                         c->sadb_comb_hard_addtime = 24*60*60;
3023                         c->sadb_comb_soft_addtime = 20*60*60;
3024                         c->sadb_comb_hard_usetime = 8*60*60;
3025                         c->sadb_comb_soft_usetime = 7*60*60;
3026                 }
3027         }
3028 }
3029
3030 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3031 {
3032         return 0;
3033 }
3034
3035 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3036 {
3037         struct sk_buff *out_skb;
3038         struct sadb_msg *out_hdr;
3039         int hard;
3040         int hsc;
3041
3042         hard = c->data.hard;
3043         if (hard)
3044                 hsc = 2;
3045         else
3046                 hsc = 1;
3047
3048         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3049         if (IS_ERR(out_skb))
3050                 return PTR_ERR(out_skb);
3051
3052         out_hdr = (struct sadb_msg *) out_skb->data;
3053         out_hdr->sadb_msg_version = PF_KEY_V2;
3054         out_hdr->sadb_msg_type = SADB_EXPIRE;
3055         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3056         out_hdr->sadb_msg_errno = 0;
3057         out_hdr->sadb_msg_reserved = 0;
3058         out_hdr->sadb_msg_seq = 0;
3059         out_hdr->sadb_msg_pid = 0;
3060
3061         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3062                         xs_net(x));
3063         return 0;
3064 }
3065
3066 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3067 {
3068         struct net *net = x ? xs_net(x) : c->net;
3069         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3070
3071         if (atomic_read(&net_pfkey->socks_nr) == 0)
3072                 return 0;
3073
3074         switch (c->event) {
3075         case XFRM_MSG_EXPIRE:
3076                 return key_notify_sa_expire(x, c);
3077         case XFRM_MSG_DELSA:
3078         case XFRM_MSG_NEWSA:
3079         case XFRM_MSG_UPDSA:
3080                 return key_notify_sa(x, c);
3081         case XFRM_MSG_FLUSHSA:
3082                 return key_notify_sa_flush(c);
3083         case XFRM_MSG_NEWAE: /* not yet supported */
3084                 break;
3085         default:
3086                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3087                 break;
3088         }
3089
3090         return 0;
3091 }
3092
3093 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3094 {
3095         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3096                 return 0;
3097
3098         switch (c->event) {
3099         case XFRM_MSG_POLEXPIRE:
3100                 return key_notify_policy_expire(xp, c);
3101         case XFRM_MSG_DELPOLICY:
3102         case XFRM_MSG_NEWPOLICY:
3103         case XFRM_MSG_UPDPOLICY:
3104                 return key_notify_policy(xp, dir, c);
3105         case XFRM_MSG_FLUSHPOLICY:
3106                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3107                         break;
3108                 return key_notify_policy_flush(c);
3109         default:
3110                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3111                 break;
3112         }
3113
3114         return 0;
3115 }
3116
3117 static u32 get_acqseq(void)
3118 {
3119         u32 res;
3120         static atomic_t acqseq;
3121
3122         do {
3123                 res = atomic_inc_return(&acqseq);
3124         } while (!res);
3125         return res;
3126 }
3127
3128 static bool pfkey_is_alive(const struct km_event *c)
3129 {
3130         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3131         struct sock *sk;
3132         bool is_alive = false;
3133
3134         rcu_read_lock();
3135         sk_for_each_rcu(sk, &net_pfkey->table) {
3136                 if (pfkey_sk(sk)->registered) {
3137                         is_alive = true;
3138                         break;
3139                 }
3140         }
3141         rcu_read_unlock();
3142
3143         return is_alive;
3144 }
3145
3146 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3147 {
3148         struct sk_buff *skb;
3149         struct sadb_msg *hdr;
3150         struct sadb_address *addr;
3151         struct sadb_x_policy *pol;
3152         int sockaddr_size;
3153         int size;
3154         struct sadb_x_sec_ctx *sec_ctx;
3155         struct xfrm_sec_ctx *xfrm_ctx;
3156         int ctx_size = 0;
3157
3158         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3159         if (!sockaddr_size)
3160                 return -EINVAL;
3161
3162         size = sizeof(struct sadb_msg) +
3163                 (sizeof(struct sadb_address) * 2) +
3164                 (sockaddr_size * 2) +
3165                 sizeof(struct sadb_x_policy);
3166
3167         if (x->id.proto == IPPROTO_AH)
3168                 size += count_ah_combs(t);
3169         else if (x->id.proto == IPPROTO_ESP)
3170                 size += count_esp_combs(t);
3171
3172         if ((xfrm_ctx = x->security)) {
3173                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3174                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3175         }
3176
3177         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3178         if (skb == NULL)
3179                 return -ENOMEM;
3180
3181         hdr = skb_put(skb, sizeof(struct sadb_msg));
3182         hdr->sadb_msg_version = PF_KEY_V2;
3183         hdr->sadb_msg_type = SADB_ACQUIRE;
3184         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3185         hdr->sadb_msg_len = size / sizeof(uint64_t);
3186         hdr->sadb_msg_errno = 0;
3187         hdr->sadb_msg_reserved = 0;
3188         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3189         hdr->sadb_msg_pid = 0;
3190
3191         /* src address */
3192         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3193         addr->sadb_address_len =
3194                 (sizeof(struct sadb_address)+sockaddr_size)/
3195                         sizeof(uint64_t);
3196         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3197         addr->sadb_address_proto = 0;
3198         addr->sadb_address_reserved = 0;
3199         addr->sadb_address_prefixlen =
3200                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3201                                     (struct sockaddr *) (addr + 1),
3202                                     x->props.family);
3203         if (!addr->sadb_address_prefixlen)
3204                 BUG();
3205
3206         /* dst address */
3207         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3208         addr->sadb_address_len =
3209                 (sizeof(struct sadb_address)+sockaddr_size)/
3210                         sizeof(uint64_t);
3211         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3212         addr->sadb_address_proto = 0;
3213         addr->sadb_address_reserved = 0;
3214         addr->sadb_address_prefixlen =
3215                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3216                                     (struct sockaddr *) (addr + 1),
3217                                     x->props.family);
3218         if (!addr->sadb_address_prefixlen)
3219                 BUG();
3220
3221         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3222         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3223         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3224         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3225         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3226         pol->sadb_x_policy_reserved = 0;
3227         pol->sadb_x_policy_id = xp->index;
3228         pol->sadb_x_policy_priority = xp->priority;
3229
3230         /* Set sadb_comb's. */
3231         if (x->id.proto == IPPROTO_AH)
3232                 dump_ah_combs(skb, t);
3233         else if (x->id.proto == IPPROTO_ESP)
3234                 dump_esp_combs(skb, t);
3235
3236         /* security context */
3237         if (xfrm_ctx) {
3238                 sec_ctx = skb_put(skb,
3239                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3240                 sec_ctx->sadb_x_sec_len =
3241                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3242                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3243                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3244                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3245                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3246                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3247                        xfrm_ctx->ctx_len);
3248         }
3249
3250         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3251                                xs_net(x));
3252 }
3253
3254 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3255                                                 u8 *data, int len, int *dir)
3256 {
3257         struct net *net = sock_net(sk);
3258         struct xfrm_policy *xp;
3259         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3260         struct sadb_x_sec_ctx *sec_ctx;
3261
3262         switch (sk->sk_family) {
3263         case AF_INET:
3264                 if (opt != IP_IPSEC_POLICY) {
3265                         *dir = -EOPNOTSUPP;
3266                         return NULL;
3267                 }
3268                 break;
3269 #if IS_ENABLED(CONFIG_IPV6)
3270         case AF_INET6:
3271                 if (opt != IPV6_IPSEC_POLICY) {
3272                         *dir = -EOPNOTSUPP;
3273                         return NULL;
3274                 }
3275                 break;
3276 #endif
3277         default:
3278                 *dir = -EINVAL;
3279                 return NULL;
3280         }
3281
3282         *dir = -EINVAL;
3283
3284         if (len < sizeof(struct sadb_x_policy) ||
3285             pol->sadb_x_policy_len*8 > len ||
3286             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3287             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3288                 return NULL;
3289
3290         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3291         if (xp == NULL) {
3292                 *dir = -ENOBUFS;
3293                 return NULL;
3294         }
3295
3296         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3297                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3298
3299         xp->lft.soft_byte_limit = XFRM_INF;
3300         xp->lft.hard_byte_limit = XFRM_INF;
3301         xp->lft.soft_packet_limit = XFRM_INF;
3302         xp->lft.hard_packet_limit = XFRM_INF;
3303         xp->family = sk->sk_family;
3304
3305         xp->xfrm_nr = 0;
3306         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3307             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3308                 goto out;
3309
3310         /* security context too */
3311         if (len >= (pol->sadb_x_policy_len*8 +
3312             sizeof(struct sadb_x_sec_ctx))) {
3313                 char *p = (char *)pol;
3314                 struct xfrm_user_sec_ctx *uctx;
3315
3316                 p += pol->sadb_x_policy_len*8;
3317                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3318                 if (len < pol->sadb_x_policy_len*8 +
3319                     sec_ctx->sadb_x_sec_len*8) {
3320                         *dir = -EINVAL;
3321                         goto out;
3322                 }
3323                 if ((*dir = verify_sec_ctx_len(p)))
3324                         goto out;
3325                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3326                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3327                 kfree(uctx);
3328
3329                 if (*dir)
3330                         goto out;
3331         }
3332
3333         *dir = pol->sadb_x_policy_dir-1;
3334         return xp;
3335
3336 out:
3337         xp->walk.dead = 1;
3338         xfrm_policy_destroy(xp);
3339         return NULL;
3340 }
3341
3342 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3343 {
3344         struct sk_buff *skb;
3345         struct sadb_msg *hdr;
3346         struct sadb_sa *sa;
3347         struct sadb_address *addr;
3348         struct sadb_x_nat_t_port *n_port;
3349         int sockaddr_size;
3350         int size;
3351         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3352         struct xfrm_encap_tmpl *natt = NULL;
3353
3354         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3355         if (!sockaddr_size)
3356                 return -EINVAL;
3357
3358         if (!satype)
3359                 return -EINVAL;
3360
3361         if (!x->encap)
3362                 return -EINVAL;
3363
3364         natt = x->encap;
3365
3366         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3367          *
3368          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3369          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3370          */
3371
3372         size = sizeof(struct sadb_msg) +
3373                 sizeof(struct sadb_sa) +
3374                 (sizeof(struct sadb_address) * 2) +
3375                 (sockaddr_size * 2) +
3376                 (sizeof(struct sadb_x_nat_t_port) * 2);
3377
3378         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3379         if (skb == NULL)
3380                 return -ENOMEM;
3381
3382         hdr = skb_put(skb, sizeof(struct sadb_msg));
3383         hdr->sadb_msg_version = PF_KEY_V2;
3384         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3385         hdr->sadb_msg_satype = satype;
3386         hdr->sadb_msg_len = size / sizeof(uint64_t);
3387         hdr->sadb_msg_errno = 0;
3388         hdr->sadb_msg_reserved = 0;
3389         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3390         hdr->sadb_msg_pid = 0;
3391
3392         /* SA */
3393         sa = skb_put(skb, sizeof(struct sadb_sa));
3394         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3395         sa->sadb_sa_exttype = SADB_EXT_SA;
3396         sa->sadb_sa_spi = x->id.spi;
3397         sa->sadb_sa_replay = 0;
3398         sa->sadb_sa_state = 0;
3399         sa->sadb_sa_auth = 0;
3400         sa->sadb_sa_encrypt = 0;
3401         sa->sadb_sa_flags = 0;
3402
3403         /* ADDRESS_SRC (old addr) */
3404         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3405         addr->sadb_address_len =
3406                 (sizeof(struct sadb_address)+sockaddr_size)/
3407                         sizeof(uint64_t);
3408         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3409         addr->sadb_address_proto = 0;
3410         addr->sadb_address_reserved = 0;
3411         addr->sadb_address_prefixlen =
3412                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3413                                     (struct sockaddr *) (addr + 1),
3414                                     x->props.family);
3415         if (!addr->sadb_address_prefixlen)
3416                 BUG();
3417
3418         /* NAT_T_SPORT (old port) */
3419         n_port = skb_put(skb, sizeof(*n_port));
3420         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3421         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3422         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3423         n_port->sadb_x_nat_t_port_reserved = 0;
3424
3425         /* ADDRESS_DST (new addr) */
3426         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3427         addr->sadb_address_len =
3428                 (sizeof(struct sadb_address)+sockaddr_size)/
3429                         sizeof(uint64_t);
3430         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3431         addr->sadb_address_proto = 0;
3432         addr->sadb_address_reserved = 0;
3433         addr->sadb_address_prefixlen =
3434                 pfkey_sockaddr_fill(ipaddr, 0,
3435                                     (struct sockaddr *) (addr + 1),
3436                                     x->props.family);
3437         if (!addr->sadb_address_prefixlen)
3438                 BUG();
3439
3440         /* NAT_T_DPORT (new port) */
3441         n_port = skb_put(skb, sizeof(*n_port));
3442         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3443         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3444         n_port->sadb_x_nat_t_port_port = sport;
3445         n_port->sadb_x_nat_t_port_reserved = 0;
3446
3447         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3448                                xs_net(x));
3449 }
3450
3451 #ifdef CONFIG_NET_KEY_MIGRATE
3452 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3453                             const struct xfrm_selector *sel)
3454 {
3455         struct sadb_address *addr;
3456         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3457         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3458         addr->sadb_address_exttype = type;
3459         addr->sadb_address_proto = sel->proto;
3460         addr->sadb_address_reserved = 0;
3461
3462         switch (type) {
3463         case SADB_EXT_ADDRESS_SRC:
3464                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3465                 pfkey_sockaddr_fill(&sel->saddr, 0,
3466                                     (struct sockaddr *)(addr + 1),
3467                                     sel->family);
3468                 break;
3469         case SADB_EXT_ADDRESS_DST:
3470                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3471                 pfkey_sockaddr_fill(&sel->daddr, 0,
3472                                     (struct sockaddr *)(addr + 1),
3473                                     sel->family);
3474                 break;
3475         default:
3476                 return -EINVAL;
3477         }
3478
3479         return 0;
3480 }
3481
3482
3483 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3484 {
3485         struct sadb_x_kmaddress *kma;
3486         u8 *sa;
3487         int family = k->family;
3488         int socklen = pfkey_sockaddr_len(family);
3489         int size_req;
3490
3491         size_req = (sizeof(struct sadb_x_kmaddress) +
3492                     pfkey_sockaddr_pair_size(family));
3493
3494         kma = skb_put_zero(skb, size_req);
3495         kma->sadb_x_kmaddress_len = size_req / 8;
3496         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3497         kma->sadb_x_kmaddress_reserved = k->reserved;
3498
3499         sa = (u8 *)(kma + 1);
3500         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3501             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3502                 return -EINVAL;
3503
3504         return 0;
3505 }
3506
3507 static int set_ipsecrequest(struct sk_buff *skb,
3508                             uint8_t proto, uint8_t mode, int level,
3509                             uint32_t reqid, uint8_t family,
3510                             const xfrm_address_t *src, const xfrm_address_t *dst)
3511 {
3512         struct sadb_x_ipsecrequest *rq;
3513         u8 *sa;
3514         int socklen = pfkey_sockaddr_len(family);
3515         int size_req;
3516
3517         size_req = sizeof(struct sadb_x_ipsecrequest) +
3518                    pfkey_sockaddr_pair_size(family);
3519
3520         rq = skb_put_zero(skb, size_req);
3521         rq->sadb_x_ipsecrequest_len = size_req;
3522         rq->sadb_x_ipsecrequest_proto = proto;
3523         rq->sadb_x_ipsecrequest_mode = mode;
3524         rq->sadb_x_ipsecrequest_level = level;
3525         rq->sadb_x_ipsecrequest_reqid = reqid;
3526
3527         sa = (u8 *) (rq + 1);
3528         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3529             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3530                 return -EINVAL;
3531
3532         return 0;
3533 }
3534 #endif
3535
3536 #ifdef CONFIG_NET_KEY_MIGRATE
3537 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3538                               const struct xfrm_migrate *m, int num_bundles,
3539                               const struct xfrm_kmaddress *k,
3540                               const struct xfrm_encap_tmpl *encap)
3541 {
3542         int i;
3543         int sasize_sel;
3544         int size = 0;
3545         int size_pol = 0;
3546         struct sk_buff *skb;
3547         struct sadb_msg *hdr;
3548         struct sadb_x_policy *pol;
3549         const struct xfrm_migrate *mp;
3550
3551         if (type != XFRM_POLICY_TYPE_MAIN)
3552                 return 0;
3553
3554         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3555                 return -EINVAL;
3556
3557         if (k != NULL) {
3558                 /* addresses for KM */
3559                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3560                                      pfkey_sockaddr_pair_size(k->family));
3561         }
3562
3563         /* selector */
3564         sasize_sel = pfkey_sockaddr_size(sel->family);
3565         if (!sasize_sel)
3566                 return -EINVAL;
3567         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3568
3569         /* policy info */
3570         size_pol += sizeof(struct sadb_x_policy);
3571
3572         /* ipsecrequests */
3573         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3574                 /* old locator pair */
3575                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3576                             pfkey_sockaddr_pair_size(mp->old_family);
3577                 /* new locator pair */
3578                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3579                             pfkey_sockaddr_pair_size(mp->new_family);
3580         }
3581
3582         size += sizeof(struct sadb_msg) + size_pol;
3583
3584         /* alloc buffer */
3585         skb = alloc_skb(size, GFP_ATOMIC);
3586         if (skb == NULL)
3587                 return -ENOMEM;
3588
3589         hdr = skb_put(skb, sizeof(struct sadb_msg));
3590         hdr->sadb_msg_version = PF_KEY_V2;
3591         hdr->sadb_msg_type = SADB_X_MIGRATE;
3592         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3593         hdr->sadb_msg_len = size / 8;
3594         hdr->sadb_msg_errno = 0;
3595         hdr->sadb_msg_reserved = 0;
3596         hdr->sadb_msg_seq = 0;
3597         hdr->sadb_msg_pid = 0;
3598
3599         /* Addresses to be used by KM for negotiation, if ext is available */
3600         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3601                 goto err;
3602
3603         /* selector src */
3604         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3605
3606         /* selector dst */
3607         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3608
3609         /* policy information */
3610         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3611         pol->sadb_x_policy_len = size_pol / 8;
3612         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3613         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3614         pol->sadb_x_policy_dir = dir + 1;
3615         pol->sadb_x_policy_reserved = 0;
3616         pol->sadb_x_policy_id = 0;
3617         pol->sadb_x_policy_priority = 0;
3618
3619         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3620                 /* old ipsecrequest */
3621                 int mode = pfkey_mode_from_xfrm(mp->mode);
3622                 if (mode < 0)
3623                         goto err;
3624                 if (set_ipsecrequest(skb, mp->proto, mode,
3625                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3626                                      mp->reqid, mp->old_family,
3627                                      &mp->old_saddr, &mp->old_daddr) < 0)
3628                         goto err;
3629
3630                 /* new ipsecrequest */
3631                 if (set_ipsecrequest(skb, mp->proto, mode,
3632                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3633                                      mp->reqid, mp->new_family,
3634                                      &mp->new_saddr, &mp->new_daddr) < 0)
3635                         goto err;
3636         }
3637
3638         /* broadcast migrate message to sockets */
3639         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3640
3641         return 0;
3642
3643 err:
3644         kfree_skb(skb);
3645         return -EINVAL;
3646 }
3647 #else
3648 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3649                               const struct xfrm_migrate *m, int num_bundles,
3650                               const struct xfrm_kmaddress *k,
3651                               const struct xfrm_encap_tmpl *encap)
3652 {
3653         return -ENOPROTOOPT;
3654 }
3655 #endif
3656
3657 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3658 {
3659         struct sock *sk = sock->sk;
3660         struct sk_buff *skb = NULL;
3661         struct sadb_msg *hdr = NULL;
3662         int err;
3663         struct net *net = sock_net(sk);
3664
3665         err = -EOPNOTSUPP;
3666         if (msg->msg_flags & MSG_OOB)
3667                 goto out;
3668
3669         err = -EMSGSIZE;
3670         if ((unsigned int)len > sk->sk_sndbuf - 32)
3671                 goto out;
3672
3673         err = -ENOBUFS;
3674         skb = alloc_skb(len, GFP_KERNEL);
3675         if (skb == NULL)
3676                 goto out;
3677
3678         err = -EFAULT;
3679         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3680                 goto out;
3681
3682         hdr = pfkey_get_base_msg(skb, &err);
3683         if (!hdr)
3684                 goto out;
3685
3686         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3687         err = pfkey_process(sk, skb, hdr);
3688         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3689
3690 out:
3691         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3692                 err = 0;
3693         kfree_skb(skb);
3694
3695         return err ? : len;
3696 }
3697
3698 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3699                          int flags)
3700 {
3701         struct sock *sk = sock->sk;
3702         struct pfkey_sock *pfk = pfkey_sk(sk);
3703         struct sk_buff *skb;
3704         int copied, err;
3705
3706         err = -EINVAL;
3707         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3708                 goto out;
3709
3710         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3711         if (skb == NULL)
3712                 goto out;
3713
3714         copied = skb->len;
3715         if (copied > len) {
3716                 msg->msg_flags |= MSG_TRUNC;
3717                 copied = len;
3718         }
3719
3720         skb_reset_transport_header(skb);
3721         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3722         if (err)
3723                 goto out_free;
3724
3725         sock_recv_ts_and_drops(msg, sk, skb);
3726
3727         err = (flags & MSG_TRUNC) ? skb->len : copied;
3728
3729         if (pfk->dump.dump != NULL &&
3730             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3731                 pfkey_do_dump(pfk);
3732
3733 out_free:
3734         skb_free_datagram(sk, skb);
3735 out:
3736         return err;
3737 }
3738
3739 static const struct proto_ops pfkey_ops = {
3740         .family         =       PF_KEY,
3741         .owner          =       THIS_MODULE,
3742         /* Operations that make no sense on pfkey sockets. */
3743         .bind           =       sock_no_bind,
3744         .connect        =       sock_no_connect,
3745         .socketpair     =       sock_no_socketpair,
3746         .accept         =       sock_no_accept,
3747         .getname        =       sock_no_getname,
3748         .ioctl          =       sock_no_ioctl,
3749         .listen         =       sock_no_listen,
3750         .shutdown       =       sock_no_shutdown,
3751         .mmap           =       sock_no_mmap,
3752         .sendpage       =       sock_no_sendpage,
3753
3754         /* Now the operations that really occur. */
3755         .release        =       pfkey_release,
3756         .poll           =       datagram_poll,
3757         .sendmsg        =       pfkey_sendmsg,
3758         .recvmsg        =       pfkey_recvmsg,
3759 };
3760
3761 static const struct net_proto_family pfkey_family_ops = {
3762         .family =       PF_KEY,
3763         .create =       pfkey_create,
3764         .owner  =       THIS_MODULE,
3765 };
3766
3767 #ifdef CONFIG_PROC_FS
3768 static int pfkey_seq_show(struct seq_file *f, void *v)
3769 {
3770         struct sock *s = sk_entry(v);
3771
3772         if (v == SEQ_START_TOKEN)
3773                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3774         else
3775                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3776                                s,
3777                                refcount_read(&s->sk_refcnt),
3778                                sk_rmem_alloc_get(s),
3779                                sk_wmem_alloc_get(s),
3780                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3781                                sock_i_ino(s)
3782                                );
3783         return 0;
3784 }
3785
3786 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3787         __acquires(rcu)
3788 {
3789         struct net *net = seq_file_net(f);
3790         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3791
3792         rcu_read_lock();
3793         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3794 }
3795
3796 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3797 {
3798         struct net *net = seq_file_net(f);
3799         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3800
3801         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3802 }
3803
3804 static void pfkey_seq_stop(struct seq_file *f, void *v)
3805         __releases(rcu)
3806 {
3807         rcu_read_unlock();
3808 }
3809
3810 static const struct seq_operations pfkey_seq_ops = {
3811         .start  = pfkey_seq_start,
3812         .next   = pfkey_seq_next,
3813         .stop   = pfkey_seq_stop,
3814         .show   = pfkey_seq_show,
3815 };
3816
3817 static int __net_init pfkey_init_proc(struct net *net)
3818 {
3819         struct proc_dir_entry *e;
3820
3821         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3822                         sizeof(struct seq_net_private));
3823         if (e == NULL)
3824                 return -ENOMEM;
3825
3826         return 0;
3827 }
3828
3829 static void __net_exit pfkey_exit_proc(struct net *net)
3830 {
3831         remove_proc_entry("pfkey", net->proc_net);
3832 }
3833 #else
3834 static inline int pfkey_init_proc(struct net *net)
3835 {
3836         return 0;
3837 }
3838
3839 static inline void pfkey_exit_proc(struct net *net)
3840 {
3841 }
3842 #endif
3843
3844 static struct xfrm_mgr pfkeyv2_mgr =
3845 {
3846         .notify         = pfkey_send_notify,
3847         .acquire        = pfkey_send_acquire,
3848         .compile_policy = pfkey_compile_policy,
3849         .new_mapping    = pfkey_send_new_mapping,
3850         .notify_policy  = pfkey_send_policy_notify,
3851         .migrate        = pfkey_send_migrate,
3852         .is_alive       = pfkey_is_alive,
3853 };
3854
3855 static int __net_init pfkey_net_init(struct net *net)
3856 {
3857         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3858         int rv;
3859
3860         INIT_HLIST_HEAD(&net_pfkey->table);
3861         atomic_set(&net_pfkey->socks_nr, 0);
3862
3863         rv = pfkey_init_proc(net);
3864
3865         return rv;
3866 }
3867
3868 static void __net_exit pfkey_net_exit(struct net *net)
3869 {
3870         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3871
3872         pfkey_exit_proc(net);
3873         WARN_ON(!hlist_empty(&net_pfkey->table));
3874 }
3875
3876 static struct pernet_operations pfkey_net_ops = {
3877         .init = pfkey_net_init,
3878         .exit = pfkey_net_exit,
3879         .id   = &pfkey_net_id,
3880         .size = sizeof(struct netns_pfkey),
3881 };
3882
3883 static void __exit ipsec_pfkey_exit(void)
3884 {
3885         xfrm_unregister_km(&pfkeyv2_mgr);
3886         sock_unregister(PF_KEY);
3887         unregister_pernet_subsys(&pfkey_net_ops);
3888         proto_unregister(&key_proto);
3889 }
3890
3891 static int __init ipsec_pfkey_init(void)
3892 {
3893         int err = proto_register(&key_proto, 0);
3894
3895         if (err != 0)
3896                 goto out;
3897
3898         err = register_pernet_subsys(&pfkey_net_ops);
3899         if (err != 0)
3900                 goto out_unregister_key_proto;
3901         err = sock_register(&pfkey_family_ops);
3902         if (err != 0)
3903                 goto out_unregister_pernet;
3904         err = xfrm_register_km(&pfkeyv2_mgr);
3905         if (err != 0)
3906                 goto out_sock_unregister;
3907 out:
3908         return err;
3909
3910 out_sock_unregister:
3911         sock_unregister(PF_KEY);
3912 out_unregister_pernet:
3913         unregister_pernet_subsys(&pfkey_net_ops);
3914 out_unregister_key_proto:
3915         proto_unregister(&key_proto);
3916         goto out;
3917 }
3918
3919 module_init(ipsec_pfkey_init);
3920 module_exit(ipsec_pfkey_exit);
3921 MODULE_LICENSE("GPL");
3922 MODULE_ALIAS_NETPROTO(PF_KEY);