net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static unsigned int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static const struct xfrm_mark dummy_mark = {0, 0};
  49 struct pfkey_sock {
  50         /* struct sock must be the first member of struct pfkey_sock */
  51         struct sock     sk;
  52         int             registered;
  53         int             promisc;
  54
  55         struct {
  56                 uint8_t         msg_version;
  57                 uint32_t        msg_portid;
  58                 int             (*dump)(struct pfkey_sock *sk);
  59                 void            (*done)(struct pfkey_sock *sk);
  60                 union {
  61                         struct xfrm_policy_walk policy;
  62                         struct xfrm_state_walk  state;
  63                 } u;
  64                 struct sk_buff  *skb;
  65         } dump;
  66         struct mutex dump_lock;
  67 };
  68
  69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  70                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  71                                u16 *family);
  72
  73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  74 {
  75         return (struct pfkey_sock *)sk;
  76 }
  77
  78 static int pfkey_can_dump(const struct sock *sk)
  79 {
  80         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  81                 return 1;
  82         return 0;
  83 }
  84
  85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  86 {
  87         if (pfk->dump.dump) {
  88                 if (pfk->dump.skb) {
  89                         kfree_skb(pfk->dump.skb);
  90                         pfk->dump.skb = NULL;
  91                 }
  92                 pfk->dump.done(pfk);
  93                 pfk->dump.dump = NULL;
  94                 pfk->dump.done = NULL;
  95         }
  96 }
  97
  98 static void pfkey_sock_destruct(struct sock *sk)
  99 {
 100         struct net *net = sock_net(sk);
 101         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 102
 103         pfkey_terminate_dump(pfkey_sk(sk));
 104         skb_queue_purge(&sk->sk_receive_queue);
 105
 106         if (!sock_flag(sk, SOCK_DEAD)) {
 107                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 108                 return;
 109         }
 110
 111         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 112         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 113
 114         atomic_dec(&net_pfkey->socks_nr);
 115 }
 116
 117 static const struct proto_ops pfkey_ops;
 118
 119 static void pfkey_insert(struct sock *sk)
 120 {
 121         struct net *net = sock_net(sk);
 122         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 123
 124         mutex_lock(&pfkey_mutex);
 125         sk_add_node_rcu(sk, &net_pfkey->table);
 126         mutex_unlock(&pfkey_mutex);
 127 }
 128
 129 static void pfkey_remove(struct sock *sk)
 130 {
 131         mutex_lock(&pfkey_mutex);
 132         sk_del_node_init_rcu(sk);
 133         mutex_unlock(&pfkey_mutex);
 134 }
 135
 136 static struct proto key_proto = {
 137         .name     = "KEY",
 138         .owner    = THIS_MODULE,
 139         .obj_size = sizeof(struct pfkey_sock),
 140 };
 141
 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 143                         int kern)
 144 {
 145         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 146         struct sock *sk;
 147         struct pfkey_sock *pfk;
 148         int err;
 149
 150         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 151                 return -EPERM;
 152         if (sock->type != SOCK_RAW)
 153                 return -ESOCKTNOSUPPORT;
 154         if (protocol != PF_KEY_V2)
 155                 return -EPROTONOSUPPORT;
 156
 157         err = -ENOMEM;
 158         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 159         if (sk == NULL)
 160                 goto out;
 161
 162         pfk = pfkey_sk(sk);
 163         mutex_init(&pfk->dump_lock);
 164
 165         sock->ops = &pfkey_ops;
 166         sock_init_data(sock, sk);
 167
 168         sk->sk_family = PF_KEY;
 169         sk->sk_destruct = pfkey_sock_destruct;
 170
 171         atomic_inc(&net_pfkey->socks_nr);
 172
 173         pfkey_insert(sk);
 174
 175         return 0;
 176 out:
 177         return err;
 178 }
 179
 180 static int pfkey_release(struct socket *sock)
 181 {
 182         struct sock *sk = sock->sk;
 183
 184         if (!sk)
 185                 return 0;
 186
 187         pfkey_remove(sk);
 188
 189         sock_orphan(sk);
 190         sock->sk = NULL;
 191         skb_queue_purge(&sk->sk_write_queue);
 192
 193         synchronize_rcu();
 194         sock_put(sk);
 195
 196         return 0;
 197 }
 198
 199 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 200                                gfp_t allocation, struct sock *sk)
 201 {
 202         int err = -ENOBUFS;
 203
 204         sock_hold(sk);
 205         if (*skb2 == NULL) {
 206                 if (refcount_read(&skb->users) != 1) {
 207                         *skb2 = skb_clone(skb, allocation);
 208                 } else {
 209                         *skb2 = skb;
 210                         refcount_inc(&skb->users);
 211                 }
 212         }
 213         if (*skb2 != NULL) {
 214                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 215                         skb_set_owner_r(*skb2, sk);
 216                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 217                         sk->sk_data_ready(sk);
 218                         *skb2 = NULL;
 219                         err = 0;
 220                 }
 221         }
 222         sock_put(sk);
 223         return err;
 224 }
 225
 226 /* Send SKB to all pfkey sockets matching selected criteria.  */
 227 #define BROADCAST_ALL           0
 228 #define BROADCAST_ONE           1
 229 #define BROADCAST_REGISTERED    2
 230 #define BROADCAST_PROMISC_ONLY  4
 231 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 232                            int broadcast_flags, struct sock *one_sk,
 233                            struct net *net)
 234 {
 235         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 236         struct sock *sk;
 237         struct sk_buff *skb2 = NULL;
 238         int err = -ESRCH;
 239
 240         /* XXX Do we need something like netlink_overrun?  I think
 241          * XXX PF_KEY socket apps will not mind current behavior.
 242          */
 243         if (!skb)
 244                 return -ENOMEM;
 245
 246         rcu_read_lock();
 247         sk_for_each_rcu(sk, &net_pfkey->table) {
 248                 struct pfkey_sock *pfk = pfkey_sk(sk);
 249                 int err2;
 250
 251                 /* Yes, it means that if you are meant to receive this
 252                  * pfkey message you receive it twice as promiscuous
 253                  * socket.
 254                  */
 255                 if (pfk->promisc)
 256                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 257
 258                 /* the exact target will be processed later */
 259                 if (sk == one_sk)
 260                         continue;
 261                 if (broadcast_flags != BROADCAST_ALL) {
 262                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 263                                 continue;
 264                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 265                             !pfk->registered)
 266                                 continue;
 267                         if (broadcast_flags & BROADCAST_ONE)
 268                                 continue;
 269                 }
 270
 271                 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 272
 273                 /* Error is cleared after successful sending to at least one
 274                  * registered KM */
 275                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 276                         err = err2;
 277         }
 278         rcu_read_unlock();
 279
 280         if (one_sk != NULL)
 281                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 282
 283         kfree_skb(skb2);
 284         kfree_skb(skb);
 285         return err;
 286 }
 287
 288 static int pfkey_do_dump(struct pfkey_sock *pfk)
 289 {
 290         struct sadb_msg *hdr;
 291         int rc;
 292
 293         mutex_lock(&pfk->dump_lock);
 294         if (!pfk->dump.dump) {
 295                 rc = 0;
 296                 goto out;
 297         }
 298
 299         rc = pfk->dump.dump(pfk);
 300         if (rc == -ENOBUFS) {
 301                 rc = 0;
 302                 goto out;
 303         }
 304
 305         if (pfk->dump.skb) {
 306                 if (!pfkey_can_dump(&pfk->sk)) {
 307                         rc = 0;
 308                         goto out;
 309                 }
 310
 311                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 312                 hdr->sadb_msg_seq = 0;
 313                 hdr->sadb_msg_errno = rc;
 314                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 315                                 &pfk->sk, sock_net(&pfk->sk));
 316                 pfk->dump.skb = NULL;
 317         }
 318
 319         pfkey_terminate_dump(pfk);
 320
 321 out:
 322         mutex_unlock(&pfk->dump_lock);
 323         return rc;
 324 }
 325
 326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 327                                  const struct sadb_msg *orig)
 328 {
 329         *new = *orig;
 330 }
 331
 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 333 {
 334         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 335         struct sadb_msg *hdr;
 336
 337         if (!skb)
 338                 return -ENOBUFS;
 339
 340         /* Woe be to the platform trying to support PFKEY yet
 341          * having normal errnos outside the 1-255 range, inclusive.
 342          */
 343         err = -err;
 344         if (err == ERESTARTSYS ||
 345             err == ERESTARTNOHAND ||
 346             err == ERESTARTNOINTR)
 347                 err = EINTR;
 348         if (err >= 512)
 349                 err = EINVAL;
 350         BUG_ON(err <= 0 || err >= 256);
 351
 352         hdr = skb_put(skb, sizeof(struct sadb_msg));
 353         pfkey_hdr_dup(hdr, orig);
 354         hdr->sadb_msg_errno = (uint8_t) err;
 355         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 356                              sizeof(uint64_t));
 357
 358         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 359
 360         return 0;
 361 }
 362
 363 static const u8 sadb_ext_min_len[] = {
 364         [SADB_EXT_RESERVED]             = (u8) 0,
 365         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 366         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 367         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 368         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 369         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 370         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 371         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 372         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 373         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 374         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 375         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 376         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 377         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 378         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 379         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 380         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 381         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 382         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 383         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 384         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 385         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 386         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 387         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 388         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 389         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 390         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 391 };
 392
 393 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 394 static int verify_address_len(const void *p)
 395 {
 396         const struct sadb_address *sp = p;
 397         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 398         const struct sockaddr_in *sin;
 399 #if IS_ENABLED(CONFIG_IPV6)
 400         const struct sockaddr_in6 *sin6;
 401 #endif
 402         int len;
 403
 404         if (sp->sadb_address_len <
 405             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 406                          sizeof(uint64_t)))
 407                 return -EINVAL;
 408
 409         switch (addr->sa_family) {
 410         case AF_INET:
 411                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 412                 if (sp->sadb_address_len != len ||
 413                     sp->sadb_address_prefixlen > 32)
 414                         return -EINVAL;
 415                 break;
 416 #if IS_ENABLED(CONFIG_IPV6)
 417         case AF_INET6:
 418                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 419                 if (sp->sadb_address_len != len ||
 420                     sp->sadb_address_prefixlen > 128)
 421                         return -EINVAL;
 422                 break;
 423 #endif
 424         default:
 425                 /* It is user using kernel to keep track of security
 426                  * associations for another protocol, such as
 427                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 428                  * lengths.
 429                  *
 430                  * XXX Actually, association/policy database is not yet
 431                  * XXX able to cope with arbitrary sockaddr families.
 432                  * XXX When it can, remove this -EINVAL.  -DaveM
 433                  */
 434                 return -EINVAL;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static inline int sadb_key_len(const struct sadb_key *key)
 441 {
 442         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 443
 444         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 445                             sizeof(uint64_t));
 446 }
 447
 448 static int verify_key_len(const void *p)
 449 {
 450         const struct sadb_key *key = p;
 451
 452         if (sadb_key_len(key) > key->sadb_key_len)
 453                 return -EINVAL;
 454
 455         return 0;
 456 }
 457
 458 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 459 {
 460         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 461                             sec_ctx->sadb_x_ctx_len,
 462                             sizeof(uint64_t));
 463 }
 464
 465 static inline int verify_sec_ctx_len(const void *p)
 466 {
 467         const struct sadb_x_sec_ctx *sec_ctx = p;
 468         int len = sec_ctx->sadb_x_ctx_len;
 469
 470         if (len > PAGE_SIZE)
 471                 return -EINVAL;
 472
 473         len = pfkey_sec_ctx_len(sec_ctx);
 474
 475         if (sec_ctx->sadb_x_sec_len != len)
 476                 return -EINVAL;
 477
 478         return 0;
 479 }
 480
 481 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 482                                                                      gfp_t gfp)
 483 {
 484         struct xfrm_user_sec_ctx *uctx = NULL;
 485         int ctx_size = sec_ctx->sadb_x_ctx_len;
 486
 487         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 488
 489         if (!uctx)
 490                 return NULL;
 491
 492         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 493         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 494         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 495         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 496         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 497         memcpy(uctx + 1, sec_ctx + 1,
 498                uctx->ctx_len);
 499
 500         return uctx;
 501 }
 502
 503 static int present_and_same_family(const struct sadb_address *src,
 504                                    const struct sadb_address *dst)
 505 {
 506         const struct sockaddr *s_addr, *d_addr;
 507
 508         if (!src || !dst)
 509                 return 0;
 510
 511         s_addr = (const struct sockaddr *)(src + 1);
 512         d_addr = (const struct sockaddr *)(dst + 1);
 513         if (s_addr->sa_family != d_addr->sa_family)
 514                 return 0;
 515         if (s_addr->sa_family != AF_INET
 516 #if IS_ENABLED(CONFIG_IPV6)
 517             && s_addr->sa_family != AF_INET6
 518 #endif
 519                 )
 520                 return 0;
 521
 522         return 1;
 523 }
 524
 525 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 526 {
 527         const char *p = (char *) hdr;
 528         int len = skb->len;
 529
 530         len -= sizeof(*hdr);
 531         p += sizeof(*hdr);
 532         while (len > 0) {
 533                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 534                 uint16_t ext_type;
 535                 int ext_len;
 536
 537                 if (len < sizeof(*ehdr))
 538                         return -EINVAL;
 539
 540                 ext_len  = ehdr->sadb_ext_len;
 541                 ext_len *= sizeof(uint64_t);
 542                 ext_type = ehdr->sadb_ext_type;
 543                 if (ext_len < sizeof(uint64_t) ||
 544                     ext_len > len ||
 545                     ext_type == SADB_EXT_RESERVED)
 546                         return -EINVAL;
 547
 548                 if (ext_type <= SADB_EXT_MAX) {
 549                         int min = (int) sadb_ext_min_len[ext_type];
 550                         if (ext_len < min)
 551                                 return -EINVAL;
 552                         if (ext_hdrs[ext_type-1] != NULL)
 553                                 return -EINVAL;
 554                         switch (ext_type) {
 555                         case SADB_EXT_ADDRESS_SRC:
 556                         case SADB_EXT_ADDRESS_DST:
 557                         case SADB_EXT_ADDRESS_PROXY:
 558                         case SADB_X_EXT_NAT_T_OA:
 559                                 if (verify_address_len(p))
 560                                         return -EINVAL;
 561                                 break;
 562                         case SADB_X_EXT_SEC_CTX:
 563                                 if (verify_sec_ctx_len(p))
 564                                         return -EINVAL;
 565                                 break;
 566                         case SADB_EXT_KEY_AUTH:
 567                         case SADB_EXT_KEY_ENCRYPT:
 568                                 if (verify_key_len(p))
 569                                         return -EINVAL;
 570                                 break;
 571                         default:
 572                                 break;
 573                         }
 574                         ext_hdrs[ext_type-1] = (void *) p;
 575                 }
 576                 p   += ext_len;
 577                 len -= ext_len;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static uint16_t
 584 pfkey_satype2proto(uint8_t satype)
 585 {
 586         switch (satype) {
 587         case SADB_SATYPE_UNSPEC:
 588                 return IPSEC_PROTO_ANY;
 589         case SADB_SATYPE_AH:
 590                 return IPPROTO_AH;
 591         case SADB_SATYPE_ESP:
 592                 return IPPROTO_ESP;
 593         case SADB_X_SATYPE_IPCOMP:
 594                 return IPPROTO_COMP;
 595         default:
 596                 return 0;
 597         }
 598         /* NOTREACHED */
 599 }
 600
 601 static uint8_t
 602 pfkey_proto2satype(uint16_t proto)
 603 {
 604         switch (proto) {
 605         case IPPROTO_AH:
 606                 return SADB_SATYPE_AH;
 607         case IPPROTO_ESP:
 608                 return SADB_SATYPE_ESP;
 609         case IPPROTO_COMP:
 610                 return SADB_X_SATYPE_IPCOMP;
 611         default:
 612                 return 0;
 613         }
 614         /* NOTREACHED */
 615 }
 616
 617 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 618  * say specifically 'just raw sockets' as we encode them as 255.
 619  */
 620
 621 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 622 {
 623         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 624 }
 625
 626 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 627 {
 628         return proto ? proto : IPSEC_PROTO_ANY;
 629 }
 630
 631 static inline int pfkey_sockaddr_len(sa_family_t family)
 632 {
 633         switch (family) {
 634         case AF_INET:
 635                 return sizeof(struct sockaddr_in);
 636 #if IS_ENABLED(CONFIG_IPV6)
 637         case AF_INET6:
 638                 return sizeof(struct sockaddr_in6);
 639 #endif
 640         }
 641         return 0;
 642 }
 643
 644 static
 645 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 646 {
 647         switch (sa->sa_family) {
 648         case AF_INET:
 649                 xaddr->a4 =
 650                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 651                 return AF_INET;
 652 #if IS_ENABLED(CONFIG_IPV6)
 653         case AF_INET6:
 654                 memcpy(xaddr->a6,
 655                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 656                        sizeof(struct in6_addr));
 657                 return AF_INET6;
 658 #endif
 659         }
 660         return 0;
 661 }
 662
 663 static
 664 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 665 {
 666         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 667                                       xaddr);
 668 }
 669
 670 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 671 {
 672         const struct sadb_sa *sa;
 673         const struct sadb_address *addr;
 674         uint16_t proto;
 675         unsigned short family;
 676         xfrm_address_t *xaddr;
 677
 678         sa = ext_hdrs[SADB_EXT_SA - 1];
 679         if (sa == NULL)
 680                 return NULL;
 681
 682         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 683         if (proto == 0)
 684                 return NULL;
 685
 686         /* sadb_address_len should be checked by caller */
 687         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 688         if (addr == NULL)
 689                 return NULL;
 690
 691         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 692         switch (family) {
 693         case AF_INET:
 694                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 695                 break;
 696 #if IS_ENABLED(CONFIG_IPV6)
 697         case AF_INET6:
 698                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 699                 break;
 700 #endif
 701         default:
 702                 xaddr = NULL;
 703         }
 704
 705         if (!xaddr)
 706                 return NULL;
 707
 708         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 709 }
 710
 711 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 712
 713 static int
 714 pfkey_sockaddr_size(sa_family_t family)
 715 {
 716         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 717 }
 718
 719 static inline int pfkey_mode_from_xfrm(int mode)
 720 {
 721         switch(mode) {
 722         case XFRM_MODE_TRANSPORT:
 723                 return IPSEC_MODE_TRANSPORT;
 724         case XFRM_MODE_TUNNEL:
 725                 return IPSEC_MODE_TUNNEL;
 726         case XFRM_MODE_BEET:
 727                 return IPSEC_MODE_BEET;
 728         default:
 729                 return -1;
 730         }
 731 }
 732
 733 static inline int pfkey_mode_to_xfrm(int mode)
 734 {
 735         switch(mode) {
 736         case IPSEC_MODE_ANY:    /*XXX*/
 737         case IPSEC_MODE_TRANSPORT:
 738                 return XFRM_MODE_TRANSPORT;
 739         case IPSEC_MODE_TUNNEL:
 740                 return XFRM_MODE_TUNNEL;
 741         case IPSEC_MODE_BEET:
 742                 return XFRM_MODE_BEET;
 743         default:
 744                 return -1;
 745         }
 746 }
 747
 748 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 749                                         struct sockaddr *sa,
 750                                         unsigned short family)
 751 {
 752         switch (family) {
 753         case AF_INET:
 754             {
 755                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 756                 sin->sin_family = AF_INET;
 757                 sin->sin_port = port;
 758                 sin->sin_addr.s_addr = xaddr->a4;
 759                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 760                 return 32;
 761             }
 762 #if IS_ENABLED(CONFIG_IPV6)
 763         case AF_INET6:
 764             {
 765                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 766                 sin6->sin6_family = AF_INET6;
 767                 sin6->sin6_port = port;
 768                 sin6->sin6_flowinfo = 0;
 769                 sin6->sin6_addr = xaddr->in6;
 770                 sin6->sin6_scope_id = 0;
 771                 return 128;
 772             }
 773 #endif
 774         }
 775         return 0;
 776 }
 777
 778 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 779                                               int add_keys, int hsc)
 780 {
 781         struct sk_buff *skb;
 782         struct sadb_msg *hdr;
 783         struct sadb_sa *sa;
 784         struct sadb_lifetime *lifetime;
 785         struct sadb_address *addr;
 786         struct sadb_key *key;
 787         struct sadb_x_sa2 *sa2;
 788         struct sadb_x_sec_ctx *sec_ctx;
 789         struct xfrm_sec_ctx *xfrm_ctx;
 790         int ctx_size = 0;
 791         int size;
 792         int auth_key_size = 0;
 793         int encrypt_key_size = 0;
 794         int sockaddr_size;
 795         struct xfrm_encap_tmpl *natt = NULL;
 796         int mode;
 797
 798         /* address family check */
 799         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 800         if (!sockaddr_size)
 801                 return ERR_PTR(-EINVAL);
 802
 803         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 804            key(AE), (identity(SD),) (sensitivity)> */
 805         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 806                 sizeof(struct sadb_lifetime) +
 807                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 808                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 809                         sizeof(struct sadb_address)*2 +
 810                                 sockaddr_size*2 +
 811                                         sizeof(struct sadb_x_sa2);
 812
 813         if ((xfrm_ctx = x->security)) {
 814                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 815                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 816         }
 817
 818         /* identity & sensitivity */
 819         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 820                 size += sizeof(struct sadb_address) + sockaddr_size;
 821
 822         if (add_keys) {
 823                 if (x->aalg && x->aalg->alg_key_len) {
 824                         auth_key_size =
 825                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 826                         size += sizeof(struct sadb_key) + auth_key_size;
 827                 }
 828                 if (x->ealg && x->ealg->alg_key_len) {
 829                         encrypt_key_size =
 830                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 831                         size += sizeof(struct sadb_key) + encrypt_key_size;
 832                 }
 833         }
 834         if (x->encap)
 835                 natt = x->encap;
 836
 837         if (natt && natt->encap_type) {
 838                 size += sizeof(struct sadb_x_nat_t_type);
 839                 size += sizeof(struct sadb_x_nat_t_port);
 840                 size += sizeof(struct sadb_x_nat_t_port);
 841         }
 842
 843         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 844         if (skb == NULL)
 845                 return ERR_PTR(-ENOBUFS);
 846
 847         /* call should fill header later */
 848         hdr = skb_put(skb, sizeof(struct sadb_msg));
 849         memset(hdr, 0, size);   /* XXX do we need this ? */
 850         hdr->sadb_msg_len = size / sizeof(uint64_t);
 851
 852         /* sa */
 853         sa = skb_put(skb, sizeof(struct sadb_sa));
 854         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 855         sa->sadb_sa_exttype = SADB_EXT_SA;
 856         sa->sadb_sa_spi = x->id.spi;
 857         sa->sadb_sa_replay = x->props.replay_window;
 858         switch (x->km.state) {
 859         case XFRM_STATE_VALID:
 860                 sa->sadb_sa_state = x->km.dying ?
 861                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 862                 break;
 863         case XFRM_STATE_ACQ:
 864                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 865                 break;
 866         default:
 867                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 868                 break;
 869         }
 870         sa->sadb_sa_auth = 0;
 871         if (x->aalg) {
 872                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 873                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 874                                         a->desc.sadb_alg_id : 0;
 875         }
 876         sa->sadb_sa_encrypt = 0;
 877         BUG_ON(x->ealg && x->calg);
 878         if (x->ealg) {
 879                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 880                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 881                                         a->desc.sadb_alg_id : 0;
 882         }
 883         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 884         if (x->calg) {
 885                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 886                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 887                                         a->desc.sadb_alg_id : 0;
 888         }
 889
 890         sa->sadb_sa_flags = 0;
 891         if (x->props.flags & XFRM_STATE_NOECN)
 892                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 893         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 894                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 895         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 896                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 897
 898         /* hard time */
 899         if (hsc & 2) {
 900                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 901                 lifetime->sadb_lifetime_len =
 902                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 903                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 904                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 905                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 906                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 907                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 908         }
 909         /* soft time */
 910         if (hsc & 1) {
 911                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 912                 lifetime->sadb_lifetime_len =
 913                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 914                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 915                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 916                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 917                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 918                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 919         }
 920         /* current time */
 921         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 922         lifetime->sadb_lifetime_len =
 923                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 924         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 925         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 926         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 927         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 928         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 929         /* src address */
 930         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 931         addr->sadb_address_len =
 932                 (sizeof(struct sadb_address)+sockaddr_size)/
 933                         sizeof(uint64_t);
 934         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 935         /* "if the ports are non-zero, then the sadb_address_proto field,
 936            normally zero, MUST be filled in with the transport
 937            protocol's number." - RFC2367 */
 938         addr->sadb_address_proto = 0;
 939         addr->sadb_address_reserved = 0;
 940
 941         addr->sadb_address_prefixlen =
 942                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 943                                     (struct sockaddr *) (addr + 1),
 944                                     x->props.family);
 945         if (!addr->sadb_address_prefixlen)
 946                 BUG();
 947
 948         /* dst address */
 949         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 950         addr->sadb_address_len =
 951                 (sizeof(struct sadb_address)+sockaddr_size)/
 952                         sizeof(uint64_t);
 953         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 954         addr->sadb_address_proto = 0;
 955         addr->sadb_address_reserved = 0;
 956
 957         addr->sadb_address_prefixlen =
 958                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 959                                     (struct sockaddr *) (addr + 1),
 960                                     x->props.family);
 961         if (!addr->sadb_address_prefixlen)
 962                 BUG();
 963
 964         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 965                              x->props.family)) {
 966                 addr = skb_put(skb,
 967                                sizeof(struct sadb_address) + sockaddr_size);
 968                 addr->sadb_address_len =
 969                         (sizeof(struct sadb_address)+sockaddr_size)/
 970                         sizeof(uint64_t);
 971                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 972                 addr->sadb_address_proto =
 973                         pfkey_proto_from_xfrm(x->sel.proto);
 974                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 975                 addr->sadb_address_reserved = 0;
 976
 977                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 978                                     (struct sockaddr *) (addr + 1),
 979                                     x->props.family);
 980         }
 981
 982         /* auth key */
 983         if (add_keys && auth_key_size) {
 984                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 985                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 986                         sizeof(uint64_t);
 987                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 988                 key->sadb_key_bits = x->aalg->alg_key_len;
 989                 key->sadb_key_reserved = 0;
 990                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 991         }
 992         /* encrypt key */
 993         if (add_keys && encrypt_key_size) {
 994                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 995                 key->sadb_key_len = (sizeof(struct sadb_key) +
 996                                      encrypt_key_size) / sizeof(uint64_t);
 997                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 998                 key->sadb_key_bits = x->ealg->alg_key_len;
 999                 key->sadb_key_reserved = 0;
1000                 memcpy(key + 1, x->ealg->alg_key,
1001                        (x->ealg->alg_key_len+7)/8);
1002         }
1003
1004         /* sa */
1005         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
1006         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1007         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1008         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1009                 kfree_skb(skb);
1010                 return ERR_PTR(-EINVAL);
1011         }
1012         sa2->sadb_x_sa2_mode = mode;
1013         sa2->sadb_x_sa2_reserved1 = 0;
1014         sa2->sadb_x_sa2_reserved2 = 0;
1015         sa2->sadb_x_sa2_sequence = 0;
1016         sa2->sadb_x_sa2_reqid = x->props.reqid;
1017
1018         if (natt && natt->encap_type) {
1019                 struct sadb_x_nat_t_type *n_type;
1020                 struct sadb_x_nat_t_port *n_port;
1021
1022                 /* type */
1023                 n_type = skb_put(skb, sizeof(*n_type));
1024                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1025                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1026                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1027                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1028                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1029                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1030
1031                 /* source port */
1032                 n_port = skb_put(skb, sizeof(*n_port));
1033                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1034                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1035                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1036                 n_port->sadb_x_nat_t_port_reserved = 0;
1037
1038                 /* dest port */
1039                 n_port = skb_put(skb, sizeof(*n_port));
1040                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1041                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1042                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1043                 n_port->sadb_x_nat_t_port_reserved = 0;
1044         }
1045
1046         /* security context */
1047         if (xfrm_ctx) {
1048                 sec_ctx = skb_put(skb,
1049                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1050                 sec_ctx->sadb_x_sec_len =
1051                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1052                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1053                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1054                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1055                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1056                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1057                        xfrm_ctx->ctx_len);
1058         }
1059
1060         return skb;
1061 }
1062
1063
1064 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1065 {
1066         struct sk_buff *skb;
1067
1068         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1069
1070         return skb;
1071 }
1072
1073 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1074                                                           int hsc)
1075 {
1076         return __pfkey_xfrm_state2msg(x, 0, hsc);
1077 }
1078
1079 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1080                                                 const struct sadb_msg *hdr,
1081                                                 void * const *ext_hdrs)
1082 {
1083         struct xfrm_state *x;
1084         const struct sadb_lifetime *lifetime;
1085         const struct sadb_sa *sa;
1086         const struct sadb_key *key;
1087         const struct sadb_x_sec_ctx *sec_ctx;
1088         uint16_t proto;
1089         int err;
1090
1091
1092         sa = ext_hdrs[SADB_EXT_SA - 1];
1093         if (!sa ||
1094             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1095                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1096                 return ERR_PTR(-EINVAL);
1097         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1098             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1099                 return ERR_PTR(-EINVAL);
1100         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1101             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1102                 return ERR_PTR(-EINVAL);
1103         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1104             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1105                 return ERR_PTR(-EINVAL);
1106
1107         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1108         if (proto == 0)
1109                 return ERR_PTR(-EINVAL);
1110
1111         /* default error is no buffer space */
1112         err = -ENOBUFS;
1113
1114         /* RFC2367:
1115
1116    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1117    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1118    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1119    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1120    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1121    not true.
1122
1123            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1124            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1125          */
1126         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1127             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1128              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1129             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1130                 return ERR_PTR(-EINVAL);
1131         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1132         if (key != NULL &&
1133             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1134             key->sadb_key_bits == 0)
1135                 return ERR_PTR(-EINVAL);
1136         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1137         if (key != NULL &&
1138             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1139             key->sadb_key_bits == 0)
1140                 return ERR_PTR(-EINVAL);
1141
1142         x = xfrm_state_alloc(net);
1143         if (x == NULL)
1144                 return ERR_PTR(-ENOBUFS);
1145
1146         x->id.proto = proto;
1147         x->id.spi = sa->sadb_sa_spi;
1148         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1149                                         (sizeof(x->replay.bitmap) * 8));
1150         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1151                 x->props.flags |= XFRM_STATE_NOECN;
1152         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1153                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1154         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1155                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1156
1157         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1158         if (lifetime != NULL) {
1159                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1160                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1161                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1162                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1163         }
1164         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1165         if (lifetime != NULL) {
1166                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1167                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1168                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1169                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1170         }
1171
1172         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1173         if (sec_ctx != NULL) {
1174                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1175
1176                 if (!uctx)
1177                         goto out;
1178
1179                 err = security_xfrm_state_alloc(x, uctx);
1180                 kfree(uctx);
1181
1182                 if (err)
1183                         goto out;
1184         }
1185
1186         err = -ENOBUFS;
1187         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1188         if (sa->sadb_sa_auth) {
1189                 int keysize = 0;
1190                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1191                 if (!a || !a->pfkey_supported) {
1192                         err = -ENOSYS;
1193                         goto out;
1194                 }
1195                 if (key)
1196                         keysize = (key->sadb_key_bits + 7) / 8;
1197                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1198                 if (!x->aalg) {
1199                         err = -ENOMEM;
1200                         goto out;
1201                 }
1202                 strcpy(x->aalg->alg_name, a->name);
1203                 x->aalg->alg_key_len = 0;
1204                 if (key) {
1205                         x->aalg->alg_key_len = key->sadb_key_bits;
1206                         memcpy(x->aalg->alg_key, key+1, keysize);
1207                 }
1208                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1209                 x->props.aalgo = sa->sadb_sa_auth;
1210                 /* x->algo.flags = sa->sadb_sa_flags; */
1211         }
1212         if (sa->sadb_sa_encrypt) {
1213                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1214                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1215                         if (!a || !a->pfkey_supported) {
1216                                 err = -ENOSYS;
1217                                 goto out;
1218                         }
1219                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1220                         if (!x->calg) {
1221                                 err = -ENOMEM;
1222                                 goto out;
1223                         }
1224                         strcpy(x->calg->alg_name, a->name);
1225                         x->props.calgo = sa->sadb_sa_encrypt;
1226                 } else {
1227                         int keysize = 0;
1228                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1229                         if (!a || !a->pfkey_supported) {
1230                                 err = -ENOSYS;
1231                                 goto out;
1232                         }
1233                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1234                         if (key)
1235                                 keysize = (key->sadb_key_bits + 7) / 8;
1236                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1237                         if (!x->ealg) {
1238                                 err = -ENOMEM;
1239                                 goto out;
1240                         }
1241                         strcpy(x->ealg->alg_name, a->name);
1242                         x->ealg->alg_key_len = 0;
1243                         if (key) {
1244                                 x->ealg->alg_key_len = key->sadb_key_bits;
1245                                 memcpy(x->ealg->alg_key, key+1, keysize);
1246                         }
1247                         x->props.ealgo = sa->sadb_sa_encrypt;
1248                         x->geniv = a->uinfo.encr.geniv;
1249                 }
1250         }
1251         /* x->algo.flags = sa->sadb_sa_flags; */
1252
1253         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1254                                                     &x->props.saddr);
1255         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1256                                   &x->id.daddr);
1257
1258         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1259                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1260                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1261                 if (mode < 0) {
1262                         err = -EINVAL;
1263                         goto out;
1264                 }
1265                 x->props.mode = mode;
1266                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1267         }
1268
1269         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1270                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1271
1272                 /* Nobody uses this, but we try. */
1273                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1274                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1275         }
1276
1277         if (!x->sel.family)
1278                 x->sel.family = x->props.family;
1279
1280         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1281                 const struct sadb_x_nat_t_type* n_type;
1282                 struct xfrm_encap_tmpl *natt;
1283
1284                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1285                 if (!x->encap) {
1286                         err = -ENOMEM;
1287                         goto out;
1288                 }
1289
1290                 natt = x->encap;
1291                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1292                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1293
1294                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1295                         const struct sadb_x_nat_t_port *n_port =
1296                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1297                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1298                 }
1299                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1300                         const struct sadb_x_nat_t_port *n_port =
1301                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1302                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1303                 }
1304                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1305         }
1306
1307         err = xfrm_init_state(x);
1308         if (err)
1309                 goto out;
1310
1311         x->km.seq = hdr->sadb_msg_seq;
1312         return x;
1313
1314 out:
1315         x->km.state = XFRM_STATE_DEAD;
1316         xfrm_state_put(x);
1317         return ERR_PTR(err);
1318 }
1319
1320 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1321 {
1322         return -EOPNOTSUPP;
1323 }
1324
1325 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1326 {
1327         struct net *net = sock_net(sk);
1328         struct sk_buff *resp_skb;
1329         struct sadb_x_sa2 *sa2;
1330         struct sadb_address *saddr, *daddr;
1331         struct sadb_msg *out_hdr;
1332         struct sadb_spirange *range;
1333         struct xfrm_state *x = NULL;
1334         int mode;
1335         int err;
1336         u32 min_spi, max_spi;
1337         u32 reqid;
1338         u8 proto;
1339         unsigned short family;
1340         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1341
1342         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1343                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1344                 return -EINVAL;
1345
1346         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1347         if (proto == 0)
1348                 return -EINVAL;
1349
1350         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1351                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1352                 if (mode < 0)
1353                         return -EINVAL;
1354                 reqid = sa2->sadb_x_sa2_reqid;
1355         } else {
1356                 mode = 0;
1357                 reqid = 0;
1358         }
1359
1360         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1361         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1362
1363         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1364         switch (family) {
1365         case AF_INET:
1366                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1367                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1368                 break;
1369 #if IS_ENABLED(CONFIG_IPV6)
1370         case AF_INET6:
1371                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1372                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1373                 break;
1374 #endif
1375         }
1376
1377         if (hdr->sadb_msg_seq) {
1378                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1379                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1380                         xfrm_state_put(x);
1381                         x = NULL;
1382                 }
1383         }
1384
1385         if (!x)
1386                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1387
1388         if (x == NULL)
1389                 return -ENOENT;
1390
1391         min_spi = 0x100;
1392         max_spi = 0x0fffffff;
1393
1394         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1395         if (range) {
1396                 min_spi = range->sadb_spirange_min;
1397                 max_spi = range->sadb_spirange_max;
1398         }
1399
1400         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1401         if (err) {
1402                 xfrm_state_put(x);
1403                 return err;
1404         }
1405
1406         err = xfrm_alloc_spi(x, min_spi, max_spi);
1407         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1408
1409         if (IS_ERR(resp_skb)) {
1410                 xfrm_state_put(x);
1411                 return  PTR_ERR(resp_skb);
1412         }
1413
1414         out_hdr = (struct sadb_msg *) resp_skb->data;
1415         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1416         out_hdr->sadb_msg_type = SADB_GETSPI;
1417         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1418         out_hdr->sadb_msg_errno = 0;
1419         out_hdr->sadb_msg_reserved = 0;
1420         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1421         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1422
1423         xfrm_state_put(x);
1424
1425         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1426
1427         return 0;
1428 }
1429
1430 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1431 {
1432         struct net *net = sock_net(sk);
1433         struct xfrm_state *x;
1434
1435         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1436                 return -EOPNOTSUPP;
1437
1438         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1439                 return 0;
1440
1441         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1442         if (x == NULL)
1443                 return 0;
1444
1445         spin_lock_bh(&x->lock);
1446         if (x->km.state == XFRM_STATE_ACQ)
1447                 x->km.state = XFRM_STATE_ERROR;
1448
1449         spin_unlock_bh(&x->lock);
1450         xfrm_state_put(x);
1451         return 0;
1452 }
1453
1454 static inline int event2poltype(int event)
1455 {
1456         switch (event) {
1457         case XFRM_MSG_DELPOLICY:
1458                 return SADB_X_SPDDELETE;
1459         case XFRM_MSG_NEWPOLICY:
1460                 return SADB_X_SPDADD;
1461         case XFRM_MSG_UPDPOLICY:
1462                 return SADB_X_SPDUPDATE;
1463         case XFRM_MSG_POLEXPIRE:
1464         //      return SADB_X_SPDEXPIRE;
1465         default:
1466                 pr_err("pfkey: Unknown policy event %d\n", event);
1467                 break;
1468         }
1469
1470         return 0;
1471 }
1472
1473 static inline int event2keytype(int event)
1474 {
1475         switch (event) {
1476         case XFRM_MSG_DELSA:
1477                 return SADB_DELETE;
1478         case XFRM_MSG_NEWSA:
1479                 return SADB_ADD;
1480         case XFRM_MSG_UPDSA:
1481                 return SADB_UPDATE;
1482         case XFRM_MSG_EXPIRE:
1483                 return SADB_EXPIRE;
1484         default:
1485                 pr_err("pfkey: Unknown SA event %d\n", event);
1486                 break;
1487         }
1488
1489         return 0;
1490 }
1491
1492 /* ADD/UPD/DEL */
1493 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1494 {
1495         struct sk_buff *skb;
1496         struct sadb_msg *hdr;
1497
1498         skb = pfkey_xfrm_state2msg(x);
1499
1500         if (IS_ERR(skb))
1501                 return PTR_ERR(skb);
1502
1503         hdr = (struct sadb_msg *) skb->data;
1504         hdr->sadb_msg_version = PF_KEY_V2;
1505         hdr->sadb_msg_type = event2keytype(c->event);
1506         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1507         hdr->sadb_msg_errno = 0;
1508         hdr->sadb_msg_reserved = 0;
1509         hdr->sadb_msg_seq = c->seq;
1510         hdr->sadb_msg_pid = c->portid;
1511
1512         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1513
1514         return 0;
1515 }
1516
1517 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1518 {
1519         struct net *net = sock_net(sk);
1520         struct xfrm_state *x;
1521         int err;
1522         struct km_event c;
1523
1524         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1525         if (IS_ERR(x))
1526                 return PTR_ERR(x);
1527
1528         xfrm_state_hold(x);
1529         if (hdr->sadb_msg_type == SADB_ADD)
1530                 err = xfrm_state_add(x);
1531         else
1532                 err = xfrm_state_update(x);
1533
1534         xfrm_audit_state_add(x, err ? 0 : 1, true);
1535
1536         if (err < 0) {
1537                 x->km.state = XFRM_STATE_DEAD;
1538                 __xfrm_state_put(x);
1539                 goto out;
1540         }
1541
1542         if (hdr->sadb_msg_type == SADB_ADD)
1543                 c.event = XFRM_MSG_NEWSA;
1544         else
1545                 c.event = XFRM_MSG_UPDSA;
1546         c.seq = hdr->sadb_msg_seq;
1547         c.portid = hdr->sadb_msg_pid;
1548         km_state_notify(x, &c);
1549 out:
1550         xfrm_state_put(x);
1551         return err;
1552 }
1553
1554 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1555 {
1556         struct net *net = sock_net(sk);
1557         struct xfrm_state *x;
1558         struct km_event c;
1559         int err;
1560
1561         if (!ext_hdrs[SADB_EXT_SA-1] ||
1562             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1563                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1564                 return -EINVAL;
1565
1566         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1567         if (x == NULL)
1568                 return -ESRCH;
1569
1570         if ((err = security_xfrm_state_delete(x)))
1571                 goto out;
1572
1573         if (xfrm_state_kern(x)) {
1574                 err = -EPERM;
1575                 goto out;
1576         }
1577
1578         err = xfrm_state_delete(x);
1579
1580         if (err < 0)
1581                 goto out;
1582
1583         c.seq = hdr->sadb_msg_seq;
1584         c.portid = hdr->sadb_msg_pid;
1585         c.event = XFRM_MSG_DELSA;
1586         km_state_notify(x, &c);
1587 out:
1588         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1589         xfrm_state_put(x);
1590
1591         return err;
1592 }
1593
1594 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1595 {
1596         struct net *net = sock_net(sk);
1597         __u8 proto;
1598         struct sk_buff *out_skb;
1599         struct sadb_msg *out_hdr;
1600         struct xfrm_state *x;
1601
1602         if (!ext_hdrs[SADB_EXT_SA-1] ||
1603             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1604                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1605                 return -EINVAL;
1606
1607         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1608         if (x == NULL)
1609                 return -ESRCH;
1610
1611         out_skb = pfkey_xfrm_state2msg(x);
1612         proto = x->id.proto;
1613         xfrm_state_put(x);
1614         if (IS_ERR(out_skb))
1615                 return  PTR_ERR(out_skb);
1616
1617         out_hdr = (struct sadb_msg *) out_skb->data;
1618         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1619         out_hdr->sadb_msg_type = SADB_GET;
1620         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1621         out_hdr->sadb_msg_errno = 0;
1622         out_hdr->sadb_msg_reserved = 0;
1623         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1624         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1625         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1626
1627         return 0;
1628 }
1629
1630 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1631                                               gfp_t allocation)
1632 {
1633         struct sk_buff *skb;
1634         struct sadb_msg *hdr;
1635         int len, auth_len, enc_len, i;
1636
1637         auth_len = xfrm_count_pfkey_auth_supported();
1638         if (auth_len) {
1639                 auth_len *= sizeof(struct sadb_alg);
1640                 auth_len += sizeof(struct sadb_supported);
1641         }
1642
1643         enc_len = xfrm_count_pfkey_enc_supported();
1644         if (enc_len) {
1645                 enc_len *= sizeof(struct sadb_alg);
1646                 enc_len += sizeof(struct sadb_supported);
1647         }
1648
1649         len = enc_len + auth_len + sizeof(struct sadb_msg);
1650
1651         skb = alloc_skb(len + 16, allocation);
1652         if (!skb)
1653                 goto out_put_algs;
1654
1655         hdr = skb_put(skb, sizeof(*hdr));
1656         pfkey_hdr_dup(hdr, orig);
1657         hdr->sadb_msg_errno = 0;
1658         hdr->sadb_msg_len = len / sizeof(uint64_t);
1659
1660         if (auth_len) {
1661                 struct sadb_supported *sp;
1662                 struct sadb_alg *ap;
1663
1664                 sp = skb_put(skb, auth_len);
1665                 ap = (struct sadb_alg *) (sp + 1);
1666
1667                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1668                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1669
1670                 for (i = 0; ; i++) {
1671                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1672                         if (!aalg)
1673                                 break;
1674                         if (!aalg->pfkey_supported)
1675                                 continue;
1676                         if (aalg->available)
1677                                 *ap++ = aalg->desc;
1678                 }
1679         }
1680
1681         if (enc_len) {
1682                 struct sadb_supported *sp;
1683                 struct sadb_alg *ap;
1684
1685                 sp = skb_put(skb, enc_len);
1686                 ap = (struct sadb_alg *) (sp + 1);
1687
1688                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1689                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1690
1691                 for (i = 0; ; i++) {
1692                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1693                         if (!ealg)
1694                                 break;
1695                         if (!ealg->pfkey_supported)
1696                                 continue;
1697                         if (ealg->available)
1698                                 *ap++ = ealg->desc;
1699                 }
1700         }
1701
1702 out_put_algs:
1703         return skb;
1704 }
1705
1706 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1707 {
1708         struct pfkey_sock *pfk = pfkey_sk(sk);
1709         struct sk_buff *supp_skb;
1710
1711         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1712                 return -EINVAL;
1713
1714         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1715                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1716                         return -EEXIST;
1717                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1718         }
1719
1720         xfrm_probe_algs();
1721
1722         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1723         if (!supp_skb) {
1724                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1725                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1726
1727                 return -ENOBUFS;
1728         }
1729
1730         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1731                         sock_net(sk));
1732         return 0;
1733 }
1734
1735 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1736 {
1737         struct sk_buff *skb;
1738         struct sadb_msg *hdr;
1739
1740         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1741         if (!skb)
1742                 return -ENOBUFS;
1743
1744         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1745         hdr->sadb_msg_errno = (uint8_t) 0;
1746         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1747
1748         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1749                                sock_net(sk));
1750 }
1751
1752 static int key_notify_sa_flush(const struct km_event *c)
1753 {
1754         struct sk_buff *skb;
1755         struct sadb_msg *hdr;
1756
1757         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1758         if (!skb)
1759                 return -ENOBUFS;
1760         hdr = skb_put(skb, sizeof(struct sadb_msg));
1761         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1762         hdr->sadb_msg_type = SADB_FLUSH;
1763         hdr->sadb_msg_seq = c->seq;
1764         hdr->sadb_msg_pid = c->portid;
1765         hdr->sadb_msg_version = PF_KEY_V2;
1766         hdr->sadb_msg_errno = (uint8_t) 0;
1767         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1768         hdr->sadb_msg_reserved = 0;
1769
1770         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1771
1772         return 0;
1773 }
1774
1775 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1776 {
1777         struct net *net = sock_net(sk);
1778         unsigned int proto;
1779         struct km_event c;
1780         int err, err2;
1781
1782         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1783         if (proto == 0)
1784                 return -EINVAL;
1785
1786         err = xfrm_state_flush(net, proto, true);
1787         err2 = unicast_flush_resp(sk, hdr);
1788         if (err || err2) {
1789                 if (err == -ESRCH) /* empty table - go quietly */
1790                         err = 0;
1791                 return err ? err : err2;
1792         }
1793
1794         c.data.proto = proto;
1795         c.seq = hdr->sadb_msg_seq;
1796         c.portid = hdr->sadb_msg_pid;
1797         c.event = XFRM_MSG_FLUSHSA;
1798         c.net = net;
1799         km_state_notify(NULL, &c);
1800
1801         return 0;
1802 }
1803
1804 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1805 {
1806         struct pfkey_sock *pfk = ptr;
1807         struct sk_buff *out_skb;
1808         struct sadb_msg *out_hdr;
1809
1810         if (!pfkey_can_dump(&pfk->sk))
1811                 return -ENOBUFS;
1812
1813         out_skb = pfkey_xfrm_state2msg(x);
1814         if (IS_ERR(out_skb))
1815                 return PTR_ERR(out_skb);
1816
1817         out_hdr = (struct sadb_msg *) out_skb->data;
1818         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1819         out_hdr->sadb_msg_type = SADB_DUMP;
1820         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1821         out_hdr->sadb_msg_errno = 0;
1822         out_hdr->sadb_msg_reserved = 0;
1823         out_hdr->sadb_msg_seq = count + 1;
1824         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1825
1826         if (pfk->dump.skb)
1827                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1828                                 &pfk->sk, sock_net(&pfk->sk));
1829         pfk->dump.skb = out_skb;
1830
1831         return 0;
1832 }
1833
1834 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1835 {
1836         struct net *net = sock_net(&pfk->sk);
1837         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1838 }
1839
1840 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1841 {
1842         struct net *net = sock_net(&pfk->sk);
1843
1844         xfrm_state_walk_done(&pfk->dump.u.state, net);
1845 }
1846
1847 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1848 {
1849         u8 proto;
1850         struct xfrm_address_filter *filter = NULL;
1851         struct pfkey_sock *pfk = pfkey_sk(sk);
1852
1853         mutex_lock(&pfk->dump_lock);
1854         if (pfk->dump.dump != NULL) {
1855                 mutex_unlock(&pfk->dump_lock);
1856                 return -EBUSY;
1857         }
1858
1859         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1860         if (proto == 0) {
1861                 mutex_unlock(&pfk->dump_lock);
1862                 return -EINVAL;
1863         }
1864
1865         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1866                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1867
1868                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1869                 if (filter == NULL) {
1870                         mutex_unlock(&pfk->dump_lock);
1871                         return -ENOMEM;
1872                 }
1873
1874                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1875                        sizeof(xfrm_address_t));
1876                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1877                        sizeof(xfrm_address_t));
1878                 filter->family = xfilter->sadb_x_filter_family;
1879                 filter->splen = xfilter->sadb_x_filter_splen;
1880                 filter->dplen = xfilter->sadb_x_filter_dplen;
1881         }
1882
1883         pfk->dump.msg_version = hdr->sadb_msg_version;
1884         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1885         pfk->dump.dump = pfkey_dump_sa;
1886         pfk->dump.done = pfkey_dump_sa_done;
1887         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1888         mutex_unlock(&pfk->dump_lock);
1889
1890         return pfkey_do_dump(pfk);
1891 }
1892
1893 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1894 {
1895         struct pfkey_sock *pfk = pfkey_sk(sk);
1896         int satype = hdr->sadb_msg_satype;
1897         bool reset_errno = false;
1898
1899         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1900                 reset_errno = true;
1901                 if (satype != 0 && satype != 1)
1902                         return -EINVAL;
1903                 pfk->promisc = satype;
1904         }
1905         if (reset_errno && skb_cloned(skb))
1906                 skb = skb_copy(skb, GFP_KERNEL);
1907         else
1908                 skb = skb_clone(skb, GFP_KERNEL);
1909
1910         if (reset_errno && skb) {
1911                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1912                 new_hdr->sadb_msg_errno = 0;
1913         }
1914
1915         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1916         return 0;
1917 }
1918
1919 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1920 {
1921         int i;
1922         u32 reqid = *(u32*)ptr;
1923
1924         for (i=0; i<xp->xfrm_nr; i++) {
1925                 if (xp->xfrm_vec[i].reqid == reqid)
1926                         return -EEXIST;
1927         }
1928         return 0;
1929 }
1930
1931 static u32 gen_reqid(struct net *net)
1932 {
1933         struct xfrm_policy_walk walk;
1934         u32 start;
1935         int rc;
1936         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1937
1938         start = reqid;
1939         do {
1940                 ++reqid;
1941                 if (reqid == 0)
1942                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1943                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1944                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1945                 xfrm_policy_walk_done(&walk, net);
1946                 if (rc != -EEXIST)
1947                         return reqid;
1948         } while (reqid != start);
1949         return 0;
1950 }
1951
1952 static int
1953 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1954 {
1955         struct net *net = xp_net(xp);
1956         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1957         int mode;
1958
1959         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1960                 return -ELOOP;
1961
1962         if (rq->sadb_x_ipsecrequest_mode == 0)
1963                 return -EINVAL;
1964
1965         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1966         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1967                 return -EINVAL;
1968         t->mode = mode;
1969         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1970                 t->optional = 1;
1971         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1972                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1973                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1974                         t->reqid = 0;
1975                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1976                         return -ENOBUFS;
1977         }
1978
1979         /* addresses present only in tunnel mode */
1980         if (t->mode == XFRM_MODE_TUNNEL) {
1981                 int err;
1982
1983                 err = parse_sockaddr_pair(
1984                         (struct sockaddr *)(rq + 1),
1985                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1986                         &t->saddr, &t->id.daddr, &t->encap_family);
1987                 if (err)
1988                         return err;
1989         } else
1990                 t->encap_family = xp->family;
1991
1992         /* No way to set this via kame pfkey */
1993         t->allalgs = 1;
1994         xp->xfrm_nr++;
1995         return 0;
1996 }
1997
1998 static int
1999 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2000 {
2001         int err;
2002         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2003         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2004
2005         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2006                 return -EINVAL;
2007
2008         while (len >= sizeof(*rq)) {
2009                 if (len < rq->sadb_x_ipsecrequest_len ||
2010                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2011                         return -EINVAL;
2012
2013                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2014                         return err;
2015                 len -= rq->sadb_x_ipsecrequest_len;
2016                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2017         }
2018         return 0;
2019 }
2020
2021 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2022 {
2023   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2024
2025         if (xfrm_ctx) {
2026                 int len = sizeof(struct sadb_x_sec_ctx);
2027                 len += xfrm_ctx->ctx_len;
2028                 return PFKEY_ALIGN8(len);
2029         }
2030         return 0;
2031 }
2032
2033 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2034 {
2035         const struct xfrm_tmpl *t;
2036         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2037         int socklen = 0;
2038         int i;
2039
2040         for (i=0; i<xp->xfrm_nr; i++) {
2041                 t = xp->xfrm_vec + i;
2042                 socklen += pfkey_sockaddr_len(t->encap_family);
2043         }
2044
2045         return sizeof(struct sadb_msg) +
2046                 (sizeof(struct sadb_lifetime) * 3) +
2047                 (sizeof(struct sadb_address) * 2) +
2048                 (sockaddr_size * 2) +
2049                 sizeof(struct sadb_x_policy) +
2050                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2051                 (socklen * 2) +
2052                 pfkey_xfrm_policy2sec_ctx_size(xp);
2053 }
2054
2055 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2056 {
2057         struct sk_buff *skb;
2058         int size;
2059
2060         size = pfkey_xfrm_policy2msg_size(xp);
2061
2062         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2063         if (skb == NULL)
2064                 return ERR_PTR(-ENOBUFS);
2065
2066         return skb;
2067 }
2068
2069 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2070 {
2071         struct sadb_msg *hdr;
2072         struct sadb_address *addr;
2073         struct sadb_lifetime *lifetime;
2074         struct sadb_x_policy *pol;
2075         struct sadb_x_sec_ctx *sec_ctx;
2076         struct xfrm_sec_ctx *xfrm_ctx;
2077         int i;
2078         int size;
2079         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2080         int socklen = pfkey_sockaddr_len(xp->family);
2081
2082         size = pfkey_xfrm_policy2msg_size(xp);
2083
2084         /* call should fill header later */
2085         hdr = skb_put(skb, sizeof(struct sadb_msg));
2086         memset(hdr, 0, size);   /* XXX do we need this ? */
2087
2088         /* src address */
2089         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2090         addr->sadb_address_len =
2091                 (sizeof(struct sadb_address)+sockaddr_size)/
2092                         sizeof(uint64_t);
2093         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2094         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2095         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2096         addr->sadb_address_reserved = 0;
2097         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2098                                  xp->selector.sport,
2099                                  (struct sockaddr *) (addr + 1),
2100                                  xp->family))
2101                 BUG();
2102
2103         /* dst address */
2104         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2105         addr->sadb_address_len =
2106                 (sizeof(struct sadb_address)+sockaddr_size)/
2107                         sizeof(uint64_t);
2108         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2109         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2110         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2111         addr->sadb_address_reserved = 0;
2112
2113         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2114                             (struct sockaddr *) (addr + 1),
2115                             xp->family);
2116
2117         /* hard time */
2118         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2119         lifetime->sadb_lifetime_len =
2120                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2121         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2122         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2123         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2124         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2125         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2126         /* soft time */
2127         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2128         lifetime->sadb_lifetime_len =
2129                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2130         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2131         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2132         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2133         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2134         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2135         /* current time */
2136         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2137         lifetime->sadb_lifetime_len =
2138                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2139         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2140         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2141         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2142         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2143         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2144
2145         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2146         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2147         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2148         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2149         if (xp->action == XFRM_POLICY_ALLOW) {
2150                 if (xp->xfrm_nr)
2151                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2152                 else
2153                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2154         }
2155         pol->sadb_x_policy_dir = dir+1;
2156         pol->sadb_x_policy_reserved = 0;
2157         pol->sadb_x_policy_id = xp->index;
2158         pol->sadb_x_policy_priority = xp->priority;
2159
2160         for (i=0; i<xp->xfrm_nr; i++) {
2161                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2162                 struct sadb_x_ipsecrequest *rq;
2163                 int req_size;
2164                 int mode;
2165
2166                 req_size = sizeof(struct sadb_x_ipsecrequest);
2167                 if (t->mode == XFRM_MODE_TUNNEL) {
2168                         socklen = pfkey_sockaddr_len(t->encap_family);
2169                         req_size += socklen * 2;
2170                 } else {
2171                         size -= 2*socklen;
2172                 }
2173                 rq = skb_put(skb, req_size);
2174                 pol->sadb_x_policy_len += req_size/8;
2175                 memset(rq, 0, sizeof(*rq));
2176                 rq->sadb_x_ipsecrequest_len = req_size;
2177                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2178                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2179                         return -EINVAL;
2180                 rq->sadb_x_ipsecrequest_mode = mode;
2181                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2182                 if (t->reqid)
2183                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2184                 if (t->optional)
2185                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2186                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2187
2188                 if (t->mode == XFRM_MODE_TUNNEL) {
2189                         u8 *sa = (void *)(rq + 1);
2190                         pfkey_sockaddr_fill(&t->saddr, 0,
2191                                             (struct sockaddr *)sa,
2192                                             t->encap_family);
2193                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2194                                             (struct sockaddr *) (sa + socklen),
2195                                             t->encap_family);
2196                 }
2197         }
2198
2199         /* security context */
2200         if ((xfrm_ctx = xp->security)) {
2201                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2202
2203                 sec_ctx = skb_put(skb, ctx_size);
2204                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2205                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2206                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2207                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2208                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2209                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2210                        xfrm_ctx->ctx_len);
2211         }
2212
2213         hdr->sadb_msg_len = size / sizeof(uint64_t);
2214         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2215
2216         return 0;
2217 }
2218
2219 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2220 {
2221         struct sk_buff *out_skb;
2222         struct sadb_msg *out_hdr;
2223         int err;
2224
2225         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2226         if (IS_ERR(out_skb))
2227                 return PTR_ERR(out_skb);
2228
2229         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2230         if (err < 0) {
2231                 kfree_skb(out_skb);
2232                 return err;
2233         }
2234
2235         out_hdr = (struct sadb_msg *) out_skb->data;
2236         out_hdr->sadb_msg_version = PF_KEY_V2;
2237
2238         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2239                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2240         else
2241                 out_hdr->sadb_msg_type = event2poltype(c->event);
2242         out_hdr->sadb_msg_errno = 0;
2243         out_hdr->sadb_msg_seq = c->seq;
2244         out_hdr->sadb_msg_pid = c->portid;
2245         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2246         return 0;
2247
2248 }
2249
2250 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2251 {
2252         struct net *net = sock_net(sk);
2253         int err = 0;
2254         struct sadb_lifetime *lifetime;
2255         struct sadb_address *sa;
2256         struct sadb_x_policy *pol;
2257         struct xfrm_policy *xp;
2258         struct km_event c;
2259         struct sadb_x_sec_ctx *sec_ctx;
2260
2261         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2262                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2263             !ext_hdrs[SADB_X_EXT_POLICY-1])
2264                 return -EINVAL;
2265
2266         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2267         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2268                 return -EINVAL;
2269         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2270                 return -EINVAL;
2271
2272         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2273         if (xp == NULL)
2274                 return -ENOBUFS;
2275
2276         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2277                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2278         xp->priority = pol->sadb_x_policy_priority;
2279
2280         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2281         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2282         xp->selector.family = xp->family;
2283         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2284         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2285         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2286         if (xp->selector.sport)
2287                 xp->selector.sport_mask = htons(0xffff);
2288
2289         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2290         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2291         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2292
2293         /* Amusing, we set this twice.  KAME apps appear to set same value
2294          * in both addresses.
2295          */
2296         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2297
2298         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2299         if (xp->selector.dport)
2300                 xp->selector.dport_mask = htons(0xffff);
2301
2302         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2303         if (sec_ctx != NULL) {
2304                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2305
2306                 if (!uctx) {
2307                         err = -ENOBUFS;
2308                         goto out;
2309                 }
2310
2311                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2312                 kfree(uctx);
2313
2314                 if (err)
2315                         goto out;
2316         }
2317
2318         xp->lft.soft_byte_limit = XFRM_INF;
2319         xp->lft.hard_byte_limit = XFRM_INF;
2320         xp->lft.soft_packet_limit = XFRM_INF;
2321         xp->lft.hard_packet_limit = XFRM_INF;
2322         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2323                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2324                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2325                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2326                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2327         }
2328         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2329                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2330                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2331                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2332                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2333         }
2334         xp->xfrm_nr = 0;
2335         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2336             (err = parse_ipsecrequests(xp, pol)) < 0)
2337                 goto out;
2338
2339         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2340                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2341
2342         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2343
2344         if (err)
2345                 goto out;
2346
2347         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2348                 c.event = XFRM_MSG_UPDPOLICY;
2349         else
2350                 c.event = XFRM_MSG_NEWPOLICY;
2351
2352         c.seq = hdr->sadb_msg_seq;
2353         c.portid = hdr->sadb_msg_pid;
2354
2355         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2356         xfrm_pol_put(xp);
2357         return 0;
2358
2359 out:
2360         xp->walk.dead = 1;
2361         xfrm_policy_destroy(xp);
2362         return err;
2363 }
2364
2365 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2366 {
2367         struct net *net = sock_net(sk);
2368         int err;
2369         struct sadb_address *sa;
2370         struct sadb_x_policy *pol;
2371         struct xfrm_policy *xp;
2372         struct xfrm_selector sel;
2373         struct km_event c;
2374         struct sadb_x_sec_ctx *sec_ctx;
2375         struct xfrm_sec_ctx *pol_ctx = NULL;
2376
2377         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2378                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2379             !ext_hdrs[SADB_X_EXT_POLICY-1])
2380                 return -EINVAL;
2381
2382         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2383         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2384                 return -EINVAL;
2385
2386         memset(&sel, 0, sizeof(sel));
2387
2388         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2389         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2390         sel.prefixlen_s = sa->sadb_address_prefixlen;
2391         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2392         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2393         if (sel.sport)
2394                 sel.sport_mask = htons(0xffff);
2395
2396         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2397         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2398         sel.prefixlen_d = sa->sadb_address_prefixlen;
2399         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2400         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2401         if (sel.dport)
2402                 sel.dport_mask = htons(0xffff);
2403
2404         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2405         if (sec_ctx != NULL) {
2406                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2407
2408                 if (!uctx)
2409                         return -ENOMEM;
2410
2411                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2412                 kfree(uctx);
2413                 if (err)
2414                         return err;
2415         }
2416
2417         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2418                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2419                                    1, &err);
2420         security_xfrm_policy_free(pol_ctx);
2421         if (xp == NULL)
2422                 return -ENOENT;
2423
2424         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2425
2426         if (err)
2427                 goto out;
2428
2429         c.seq = hdr->sadb_msg_seq;
2430         c.portid = hdr->sadb_msg_pid;
2431         c.data.byid = 0;
2432         c.event = XFRM_MSG_DELPOLICY;
2433         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2434
2435 out:
2436         xfrm_pol_put(xp);
2437         return err;
2438 }
2439
2440 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2441 {
2442         int err;
2443         struct sk_buff *out_skb;
2444         struct sadb_msg *out_hdr;
2445         err = 0;
2446
2447         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2448         if (IS_ERR(out_skb)) {
2449                 err =  PTR_ERR(out_skb);
2450                 goto out;
2451         }
2452         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2453         if (err < 0)
2454                 goto out;
2455
2456         out_hdr = (struct sadb_msg *) out_skb->data;
2457         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2458         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2459         out_hdr->sadb_msg_satype = 0;
2460         out_hdr->sadb_msg_errno = 0;
2461         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2462         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2463         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2464         err = 0;
2465
2466 out:
2467         return err;
2468 }
2469
2470 static int pfkey_sockaddr_pair_size(sa_family_t family)
2471 {
2472         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2473 }
2474
2475 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2476                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2477                                u16 *family)
2478 {
2479         int af, socklen;
2480
2481         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2482                 return -EINVAL;
2483
2484         af = pfkey_sockaddr_extract(sa, saddr);
2485         if (!af)
2486                 return -EINVAL;
2487
2488         socklen = pfkey_sockaddr_len(af);
2489         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2490                                    daddr) != af)
2491                 return -EINVAL;
2492
2493         *family = af;
2494         return 0;
2495 }
2496
2497 #ifdef CONFIG_NET_KEY_MIGRATE
2498 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2499                                     struct xfrm_migrate *m)
2500 {
2501         int err;
2502         struct sadb_x_ipsecrequest *rq2;
2503         int mode;
2504
2505         if (len < sizeof(*rq1) ||
2506             len < rq1->sadb_x_ipsecrequest_len ||
2507             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2508                 return -EINVAL;
2509
2510         /* old endoints */
2511         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2512                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2513                                   &m->old_saddr, &m->old_daddr,
2514                                   &m->old_family);
2515         if (err)
2516                 return err;
2517
2518         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2519         len -= rq1->sadb_x_ipsecrequest_len;
2520
2521         if (len <= sizeof(*rq2) ||
2522             len < rq2->sadb_x_ipsecrequest_len ||
2523             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2524                 return -EINVAL;
2525
2526         /* new endpoints */
2527         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2528                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2529                                   &m->new_saddr, &m->new_daddr,
2530                                   &m->new_family);
2531         if (err)
2532                 return err;
2533
2534         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2535             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2536             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2537                 return -EINVAL;
2538
2539         m->proto = rq1->sadb_x_ipsecrequest_proto;
2540         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2541                 return -EINVAL;
2542         m->mode = mode;
2543         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2544
2545         return ((int)(rq1->sadb_x_ipsecrequest_len +
2546                       rq2->sadb_x_ipsecrequest_len));
2547 }
2548
2549 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2550                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2551 {
2552         int i, len, ret, err = -EINVAL;
2553         u8 dir;
2554         struct sadb_address *sa;
2555         struct sadb_x_kmaddress *kma;
2556         struct sadb_x_policy *pol;
2557         struct sadb_x_ipsecrequest *rq;
2558         struct xfrm_selector sel;
2559         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2560         struct xfrm_kmaddress k;
2561         struct net *net = sock_net(sk);
2562
2563         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2564                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2565             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2566                 err = -EINVAL;
2567                 goto out;
2568         }
2569
2570         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2571         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2572
2573         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2574                 err = -EINVAL;
2575                 goto out;
2576         }
2577
2578         if (kma) {
2579                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2580                 k.reserved = kma->sadb_x_kmaddress_reserved;
2581                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2582                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2583                                           &k.local, &k.remote, &k.family);
2584                 if (ret < 0) {
2585                         err = ret;
2586                         goto out;
2587                 }
2588         }
2589
2590         dir = pol->sadb_x_policy_dir - 1;
2591         memset(&sel, 0, sizeof(sel));
2592
2593         /* set source address info of selector */
2594         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2595         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2596         sel.prefixlen_s = sa->sadb_address_prefixlen;
2597         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2598         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2599         if (sel.sport)
2600                 sel.sport_mask = htons(0xffff);
2601
2602         /* set destination address info of selector */
2603         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2604         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2605         sel.prefixlen_d = sa->sadb_address_prefixlen;
2606         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2607         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2608         if (sel.dport)
2609                 sel.dport_mask = htons(0xffff);
2610
2611         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2612
2613         /* extract ipsecrequests */
2614         i = 0;
2615         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2616
2617         while (len > 0 && i < XFRM_MAX_DEPTH) {
2618                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2619                 if (ret < 0) {
2620                         err = ret;
2621                         goto out;
2622                 } else {
2623                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2624                         len -= ret;
2625                         i++;
2626                 }
2627         }
2628
2629         if (!i || len > 0) {
2630                 err = -EINVAL;
2631                 goto out;
2632         }
2633
2634         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2635                             kma ? &k : NULL, net, NULL);
2636
2637  out:
2638         return err;
2639 }
2640 #else
2641 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2642                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2643 {
2644         return -ENOPROTOOPT;
2645 }
2646 #endif
2647
2648
2649 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2650 {
2651         struct net *net = sock_net(sk);
2652         unsigned int dir;
2653         int err = 0, delete;
2654         struct sadb_x_policy *pol;
2655         struct xfrm_policy *xp;
2656         struct km_event c;
2657
2658         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2659                 return -EINVAL;
2660
2661         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2662         if (dir >= XFRM_POLICY_MAX)
2663                 return -EINVAL;
2664
2665         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2666         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2667                               dir, pol->sadb_x_policy_id, delete, &err);
2668         if (xp == NULL)
2669                 return -ENOENT;
2670
2671         if (delete) {
2672                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2673
2674                 if (err)
2675                         goto out;
2676                 c.seq = hdr->sadb_msg_seq;
2677                 c.portid = hdr->sadb_msg_pid;
2678                 c.data.byid = 1;
2679                 c.event = XFRM_MSG_DELPOLICY;
2680                 km_policy_notify(xp, dir, &c);
2681         } else {
2682                 err = key_pol_get_resp(sk, xp, hdr, dir);
2683         }
2684
2685 out:
2686         xfrm_pol_put(xp);
2687         return err;
2688 }
2689
2690 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2691 {
2692         struct pfkey_sock *pfk = ptr;
2693         struct sk_buff *out_skb;
2694         struct sadb_msg *out_hdr;
2695         int err;
2696
2697         if (!pfkey_can_dump(&pfk->sk))
2698                 return -ENOBUFS;
2699
2700         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2701         if (IS_ERR(out_skb))
2702                 return PTR_ERR(out_skb);
2703
2704         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2705         if (err < 0)
2706                 return err;
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         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2837                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2838
2839         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2840         err = parse_exthdrs(skb, hdr, ext_hdrs);
2841         if (!err) {
2842                 err = -EOPNOTSUPP;
2843                 if (pfkey_funcs[hdr->sadb_msg_type])
2844                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2845         }
2846         return err;
2847 }
2848
2849 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2850 {
2851         struct sadb_msg *hdr = NULL;
2852
2853         if (skb->len < sizeof(*hdr)) {
2854                 *errp = -EMSGSIZE;
2855         } else {
2856                 hdr = (struct sadb_msg *) skb->data;
2857                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2858                     hdr->sadb_msg_reserved != 0 ||
2859                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2860                      hdr->sadb_msg_type > SADB_MAX)) {
2861                         hdr = NULL;
2862                         *errp = -EINVAL;
2863                 } else if (hdr->sadb_msg_len != (skb->len /
2864                                                  sizeof(uint64_t)) ||
2865                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2866                                                 sizeof(uint64_t))) {
2867                         hdr = NULL;
2868                         *errp = -EMSGSIZE;
2869                 } else {
2870                         *errp = 0;
2871                 }
2872         }
2873         return hdr;
2874 }
2875
2876 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2877                                 const struct xfrm_algo_desc *d)
2878 {
2879         unsigned int id = d->desc.sadb_alg_id;
2880
2881         if (id >= sizeof(t->aalgos) * 8)
2882                 return 0;
2883
2884         return (t->aalgos >> id) & 1;
2885 }
2886
2887 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2888                                 const struct xfrm_algo_desc *d)
2889 {
2890         unsigned int id = d->desc.sadb_alg_id;
2891
2892         if (id >= sizeof(t->ealgos) * 8)
2893                 return 0;
2894
2895         return (t->ealgos >> id) & 1;
2896 }
2897
2898 static int count_ah_combs(const struct xfrm_tmpl *t)
2899 {
2900         int i, sz = 0;
2901
2902         for (i = 0; ; i++) {
2903                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2904                 if (!aalg)
2905                         break;
2906                 if (!aalg->pfkey_supported)
2907                         continue;
2908                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2909                         sz += sizeof(struct sadb_comb);
2910         }
2911         return sz + sizeof(struct sadb_prop);
2912 }
2913
2914 static int count_esp_combs(const struct xfrm_tmpl *t)
2915 {
2916         int i, k, sz = 0;
2917
2918         for (i = 0; ; i++) {
2919                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2920                 if (!ealg)
2921                         break;
2922
2923                 if (!ealg->pfkey_supported)
2924                         continue;
2925
2926                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2927                         continue;
2928
2929                 for (k = 1; ; k++) {
2930                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2931                         if (!aalg)
2932                                 break;
2933
2934                         if (!aalg->pfkey_supported)
2935                                 continue;
2936
2937                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2938                                 sz += sizeof(struct sadb_comb);
2939                 }
2940         }
2941         return sz + sizeof(struct sadb_prop);
2942 }
2943
2944 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2945 {
2946         struct sadb_prop *p;
2947         int i;
2948
2949         p = skb_put(skb, sizeof(struct sadb_prop));
2950         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2951         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2952         p->sadb_prop_replay = 32;
2953         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2954
2955         for (i = 0; ; i++) {
2956                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2957                 if (!aalg)
2958                         break;
2959
2960                 if (!aalg->pfkey_supported)
2961                         continue;
2962
2963                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2964                         struct sadb_comb *c;
2965                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2966                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2967                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2968                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2969                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2970                         c->sadb_comb_hard_addtime = 24*60*60;
2971                         c->sadb_comb_soft_addtime = 20*60*60;
2972                         c->sadb_comb_hard_usetime = 8*60*60;
2973                         c->sadb_comb_soft_usetime = 7*60*60;
2974                 }
2975         }
2976 }
2977
2978 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2979 {
2980         struct sadb_prop *p;
2981         int i, k;
2982
2983         p = skb_put(skb, sizeof(struct sadb_prop));
2984         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2985         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2986         p->sadb_prop_replay = 32;
2987         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2988
2989         for (i=0; ; i++) {
2990                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2991                 if (!ealg)
2992                         break;
2993
2994                 if (!ealg->pfkey_supported)
2995                         continue;
2996
2997                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2998                         continue;
2999
3000                 for (k = 1; ; k++) {
3001                         struct sadb_comb *c;
3002                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3003                         if (!aalg)
3004                                 break;
3005                         if (!aalg->pfkey_supported)
3006                                 continue;
3007                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3008                                 continue;
3009                         c = skb_put(skb, sizeof(struct sadb_comb));
3010                         memset(c, 0, sizeof(*c));
3011                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3012                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3013                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3014                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3015                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3016                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3017                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3018                         c->sadb_comb_hard_addtime = 24*60*60;
3019                         c->sadb_comb_soft_addtime = 20*60*60;
3020                         c->sadb_comb_hard_usetime = 8*60*60;
3021                         c->sadb_comb_soft_usetime = 7*60*60;
3022                 }
3023         }
3024 }
3025
3026 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3027 {
3028         return 0;
3029 }
3030
3031 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3032 {
3033         struct sk_buff *out_skb;
3034         struct sadb_msg *out_hdr;
3035         int hard;
3036         int hsc;
3037
3038         hard = c->data.hard;
3039         if (hard)
3040                 hsc = 2;
3041         else
3042                 hsc = 1;
3043
3044         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3045         if (IS_ERR(out_skb))
3046                 return PTR_ERR(out_skb);
3047
3048         out_hdr = (struct sadb_msg *) out_skb->data;
3049         out_hdr->sadb_msg_version = PF_KEY_V2;
3050         out_hdr->sadb_msg_type = SADB_EXPIRE;
3051         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3052         out_hdr->sadb_msg_errno = 0;
3053         out_hdr->sadb_msg_reserved = 0;
3054         out_hdr->sadb_msg_seq = 0;
3055         out_hdr->sadb_msg_pid = 0;
3056
3057         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3058                         xs_net(x));
3059         return 0;
3060 }
3061
3062 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3063 {
3064         struct net *net = x ? xs_net(x) : c->net;
3065         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3066
3067         if (atomic_read(&net_pfkey->socks_nr) == 0)
3068                 return 0;
3069
3070         switch (c->event) {
3071         case XFRM_MSG_EXPIRE:
3072                 return key_notify_sa_expire(x, c);
3073         case XFRM_MSG_DELSA:
3074         case XFRM_MSG_NEWSA:
3075         case XFRM_MSG_UPDSA:
3076                 return key_notify_sa(x, c);
3077         case XFRM_MSG_FLUSHSA:
3078                 return key_notify_sa_flush(c);
3079         case XFRM_MSG_NEWAE: /* not yet supported */
3080                 break;
3081         default:
3082                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3083                 break;
3084         }
3085
3086         return 0;
3087 }
3088
3089 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3090 {
3091         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3092                 return 0;
3093
3094         switch (c->event) {
3095         case XFRM_MSG_POLEXPIRE:
3096                 return key_notify_policy_expire(xp, c);
3097         case XFRM_MSG_DELPOLICY:
3098         case XFRM_MSG_NEWPOLICY:
3099         case XFRM_MSG_UPDPOLICY:
3100                 return key_notify_policy(xp, dir, c);
3101         case XFRM_MSG_FLUSHPOLICY:
3102                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3103                         break;
3104                 return key_notify_policy_flush(c);
3105         default:
3106                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3107                 break;
3108         }
3109
3110         return 0;
3111 }
3112
3113 static u32 get_acqseq(void)
3114 {
3115         u32 res;
3116         static atomic_t acqseq;
3117
3118         do {
3119                 res = atomic_inc_return(&acqseq);
3120         } while (!res);
3121         return res;
3122 }
3123
3124 static bool pfkey_is_alive(const struct km_event *c)
3125 {
3126         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3127         struct sock *sk;
3128         bool is_alive = false;
3129
3130         rcu_read_lock();
3131         sk_for_each_rcu(sk, &net_pfkey->table) {
3132                 if (pfkey_sk(sk)->registered) {
3133                         is_alive = true;
3134                         break;
3135                 }
3136         }
3137         rcu_read_unlock();
3138
3139         return is_alive;
3140 }
3141
3142 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3143 {
3144         struct sk_buff *skb;
3145         struct sadb_msg *hdr;
3146         struct sadb_address *addr;
3147         struct sadb_x_policy *pol;
3148         int sockaddr_size;
3149         int size;
3150         struct sadb_x_sec_ctx *sec_ctx;
3151         struct xfrm_sec_ctx *xfrm_ctx;
3152         int ctx_size = 0;
3153
3154         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3155         if (!sockaddr_size)
3156                 return -EINVAL;
3157
3158         size = sizeof(struct sadb_msg) +
3159                 (sizeof(struct sadb_address) * 2) +
3160                 (sockaddr_size * 2) +
3161                 sizeof(struct sadb_x_policy);
3162
3163         if (x->id.proto == IPPROTO_AH)
3164                 size += count_ah_combs(t);
3165         else if (x->id.proto == IPPROTO_ESP)
3166                 size += count_esp_combs(t);
3167
3168         if ((xfrm_ctx = x->security)) {
3169                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3170                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3171         }
3172
3173         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3174         if (skb == NULL)
3175                 return -ENOMEM;
3176
3177         hdr = skb_put(skb, sizeof(struct sadb_msg));
3178         hdr->sadb_msg_version = PF_KEY_V2;
3179         hdr->sadb_msg_type = SADB_ACQUIRE;
3180         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3181         hdr->sadb_msg_len = size / sizeof(uint64_t);
3182         hdr->sadb_msg_errno = 0;
3183         hdr->sadb_msg_reserved = 0;
3184         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3185         hdr->sadb_msg_pid = 0;
3186
3187         /* src address */
3188         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3189         addr->sadb_address_len =
3190                 (sizeof(struct sadb_address)+sockaddr_size)/
3191                         sizeof(uint64_t);
3192         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3193         addr->sadb_address_proto = 0;
3194         addr->sadb_address_reserved = 0;
3195         addr->sadb_address_prefixlen =
3196                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3197                                     (struct sockaddr *) (addr + 1),
3198                                     x->props.family);
3199         if (!addr->sadb_address_prefixlen)
3200                 BUG();
3201
3202         /* dst address */
3203         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3204         addr->sadb_address_len =
3205                 (sizeof(struct sadb_address)+sockaddr_size)/
3206                         sizeof(uint64_t);
3207         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3208         addr->sadb_address_proto = 0;
3209         addr->sadb_address_reserved = 0;
3210         addr->sadb_address_prefixlen =
3211                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3212                                     (struct sockaddr *) (addr + 1),
3213                                     x->props.family);
3214         if (!addr->sadb_address_prefixlen)
3215                 BUG();
3216
3217         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3218         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3219         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3220         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3221         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3222         pol->sadb_x_policy_reserved = 0;
3223         pol->sadb_x_policy_id = xp->index;
3224         pol->sadb_x_policy_priority = xp->priority;
3225
3226         /* Set sadb_comb's. */
3227         if (x->id.proto == IPPROTO_AH)
3228                 dump_ah_combs(skb, t);
3229         else if (x->id.proto == IPPROTO_ESP)
3230                 dump_esp_combs(skb, t);
3231
3232         /* security context */
3233         if (xfrm_ctx) {
3234                 sec_ctx = skb_put(skb,
3235                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3236                 sec_ctx->sadb_x_sec_len =
3237                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3238                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3239                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3240                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3241                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3242                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3243                        xfrm_ctx->ctx_len);
3244         }
3245
3246         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3247                                xs_net(x));
3248 }
3249
3250 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3251                                                 u8 *data, int len, int *dir)
3252 {
3253         struct net *net = sock_net(sk);
3254         struct xfrm_policy *xp;
3255         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3256         struct sadb_x_sec_ctx *sec_ctx;
3257
3258         switch (sk->sk_family) {
3259         case AF_INET:
3260                 if (opt != IP_IPSEC_POLICY) {
3261                         *dir = -EOPNOTSUPP;
3262                         return NULL;
3263                 }
3264                 break;
3265 #if IS_ENABLED(CONFIG_IPV6)
3266         case AF_INET6:
3267                 if (opt != IPV6_IPSEC_POLICY) {
3268                         *dir = -EOPNOTSUPP;
3269                         return NULL;
3270                 }
3271                 break;
3272 #endif
3273         default:
3274                 *dir = -EINVAL;
3275                 return NULL;
3276         }
3277
3278         *dir = -EINVAL;
3279
3280         if (len < sizeof(struct sadb_x_policy) ||
3281             pol->sadb_x_policy_len*8 > len ||
3282             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3283             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3284                 return NULL;
3285
3286         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3287         if (xp == NULL) {
3288                 *dir = -ENOBUFS;
3289                 return NULL;
3290         }
3291
3292         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3293                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3294
3295         xp->lft.soft_byte_limit = XFRM_INF;
3296         xp->lft.hard_byte_limit = XFRM_INF;
3297         xp->lft.soft_packet_limit = XFRM_INF;
3298         xp->lft.hard_packet_limit = XFRM_INF;
3299         xp->family = sk->sk_family;
3300
3301         xp->xfrm_nr = 0;
3302         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3303             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3304                 goto out;
3305
3306         /* security context too */
3307         if (len >= (pol->sadb_x_policy_len*8 +
3308             sizeof(struct sadb_x_sec_ctx))) {
3309                 char *p = (char *)pol;
3310                 struct xfrm_user_sec_ctx *uctx;
3311
3312                 p += pol->sadb_x_policy_len*8;
3313                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3314                 if (len < pol->sadb_x_policy_len*8 +
3315                     sec_ctx->sadb_x_sec_len*8) {
3316                         *dir = -EINVAL;
3317                         goto out;
3318                 }
3319                 if ((*dir = verify_sec_ctx_len(p)))
3320                         goto out;
3321                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3322                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3323                 kfree(uctx);
3324
3325                 if (*dir)
3326                         goto out;
3327         }
3328
3329         *dir = pol->sadb_x_policy_dir-1;
3330         return xp;
3331
3332 out:
3333         xp->walk.dead = 1;
3334         xfrm_policy_destroy(xp);
3335         return NULL;
3336 }
3337
3338 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3339 {
3340         struct sk_buff *skb;
3341         struct sadb_msg *hdr;
3342         struct sadb_sa *sa;
3343         struct sadb_address *addr;
3344         struct sadb_x_nat_t_port *n_port;
3345         int sockaddr_size;
3346         int size;
3347         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3348         struct xfrm_encap_tmpl *natt = NULL;
3349
3350         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3351         if (!sockaddr_size)
3352                 return -EINVAL;
3353
3354         if (!satype)
3355                 return -EINVAL;
3356
3357         if (!x->encap)
3358                 return -EINVAL;
3359
3360         natt = x->encap;
3361
3362         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3363          *
3364          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3365          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3366          */
3367
3368         size = sizeof(struct sadb_msg) +
3369                 sizeof(struct sadb_sa) +
3370                 (sizeof(struct sadb_address) * 2) +
3371                 (sockaddr_size * 2) +
3372                 (sizeof(struct sadb_x_nat_t_port) * 2);
3373
3374         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3375         if (skb == NULL)
3376                 return -ENOMEM;
3377
3378         hdr = skb_put(skb, sizeof(struct sadb_msg));
3379         hdr->sadb_msg_version = PF_KEY_V2;
3380         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3381         hdr->sadb_msg_satype = satype;
3382         hdr->sadb_msg_len = size / sizeof(uint64_t);
3383         hdr->sadb_msg_errno = 0;
3384         hdr->sadb_msg_reserved = 0;
3385         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3386         hdr->sadb_msg_pid = 0;
3387
3388         /* SA */
3389         sa = skb_put(skb, sizeof(struct sadb_sa));
3390         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3391         sa->sadb_sa_exttype = SADB_EXT_SA;
3392         sa->sadb_sa_spi = x->id.spi;
3393         sa->sadb_sa_replay = 0;
3394         sa->sadb_sa_state = 0;
3395         sa->sadb_sa_auth = 0;
3396         sa->sadb_sa_encrypt = 0;
3397         sa->sadb_sa_flags = 0;
3398
3399         /* ADDRESS_SRC (old addr) */
3400         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3401         addr->sadb_address_len =
3402                 (sizeof(struct sadb_address)+sockaddr_size)/
3403                         sizeof(uint64_t);
3404         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3405         addr->sadb_address_proto = 0;
3406         addr->sadb_address_reserved = 0;
3407         addr->sadb_address_prefixlen =
3408                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3409                                     (struct sockaddr *) (addr + 1),
3410                                     x->props.family);
3411         if (!addr->sadb_address_prefixlen)
3412                 BUG();
3413
3414         /* NAT_T_SPORT (old port) */
3415         n_port = skb_put(skb, sizeof(*n_port));
3416         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3417         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3418         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3419         n_port->sadb_x_nat_t_port_reserved = 0;
3420
3421         /* ADDRESS_DST (new addr) */
3422         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3423         addr->sadb_address_len =
3424                 (sizeof(struct sadb_address)+sockaddr_size)/
3425                         sizeof(uint64_t);
3426         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3427         addr->sadb_address_proto = 0;
3428         addr->sadb_address_reserved = 0;
3429         addr->sadb_address_prefixlen =
3430                 pfkey_sockaddr_fill(ipaddr, 0,
3431                                     (struct sockaddr *) (addr + 1),
3432                                     x->props.family);
3433         if (!addr->sadb_address_prefixlen)
3434                 BUG();
3435
3436         /* NAT_T_DPORT (new port) */
3437         n_port = skb_put(skb, sizeof(*n_port));
3438         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3439         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3440         n_port->sadb_x_nat_t_port_port = sport;
3441         n_port->sadb_x_nat_t_port_reserved = 0;
3442
3443         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3444                                xs_net(x));
3445 }
3446
3447 #ifdef CONFIG_NET_KEY_MIGRATE
3448 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3449                             const struct xfrm_selector *sel)
3450 {
3451         struct sadb_address *addr;
3452         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3453         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3454         addr->sadb_address_exttype = type;
3455         addr->sadb_address_proto = sel->proto;
3456         addr->sadb_address_reserved = 0;
3457
3458         switch (type) {
3459         case SADB_EXT_ADDRESS_SRC:
3460                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3461                 pfkey_sockaddr_fill(&sel->saddr, 0,
3462                                     (struct sockaddr *)(addr + 1),
3463                                     sel->family);
3464                 break;
3465         case SADB_EXT_ADDRESS_DST:
3466                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3467                 pfkey_sockaddr_fill(&sel->daddr, 0,
3468                                     (struct sockaddr *)(addr + 1),
3469                                     sel->family);
3470                 break;
3471         default:
3472                 return -EINVAL;
3473         }
3474
3475         return 0;
3476 }
3477
3478
3479 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3480 {
3481         struct sadb_x_kmaddress *kma;
3482         u8 *sa;
3483         int family = k->family;
3484         int socklen = pfkey_sockaddr_len(family);
3485         int size_req;
3486
3487         size_req = (sizeof(struct sadb_x_kmaddress) +
3488                     pfkey_sockaddr_pair_size(family));
3489
3490         kma = skb_put_zero(skb, size_req);
3491         kma->sadb_x_kmaddress_len = size_req / 8;
3492         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3493         kma->sadb_x_kmaddress_reserved = k->reserved;
3494
3495         sa = (u8 *)(kma + 1);
3496         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3497             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3498                 return -EINVAL;
3499
3500         return 0;
3501 }
3502
3503 static int set_ipsecrequest(struct sk_buff *skb,
3504                             uint8_t proto, uint8_t mode, int level,
3505                             uint32_t reqid, uint8_t family,
3506                             const xfrm_address_t *src, const xfrm_address_t *dst)
3507 {
3508         struct sadb_x_ipsecrequest *rq;
3509         u8 *sa;
3510         int socklen = pfkey_sockaddr_len(family);
3511         int size_req;
3512
3513         size_req = sizeof(struct sadb_x_ipsecrequest) +
3514                    pfkey_sockaddr_pair_size(family);
3515
3516         rq = skb_put_zero(skb, size_req);
3517         rq->sadb_x_ipsecrequest_len = size_req;
3518         rq->sadb_x_ipsecrequest_proto = proto;
3519         rq->sadb_x_ipsecrequest_mode = mode;
3520         rq->sadb_x_ipsecrequest_level = level;
3521         rq->sadb_x_ipsecrequest_reqid = reqid;
3522
3523         sa = (u8 *) (rq + 1);
3524         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3525             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3526                 return -EINVAL;
3527
3528         return 0;
3529 }
3530 #endif
3531
3532 #ifdef CONFIG_NET_KEY_MIGRATE
3533 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3534                               const struct xfrm_migrate *m, int num_bundles,
3535                               const struct xfrm_kmaddress *k,
3536                               const struct xfrm_encap_tmpl *encap)
3537 {
3538         int i;
3539         int sasize_sel;
3540         int size = 0;
3541         int size_pol = 0;
3542         struct sk_buff *skb;
3543         struct sadb_msg *hdr;
3544         struct sadb_x_policy *pol;
3545         const struct xfrm_migrate *mp;
3546
3547         if (type != XFRM_POLICY_TYPE_MAIN)
3548                 return 0;
3549
3550         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3551                 return -EINVAL;
3552
3553         if (k != NULL) {
3554                 /* addresses for KM */
3555                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3556                                      pfkey_sockaddr_pair_size(k->family));
3557         }
3558
3559         /* selector */
3560         sasize_sel = pfkey_sockaddr_size(sel->family);
3561         if (!sasize_sel)
3562                 return -EINVAL;
3563         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3564
3565         /* policy info */
3566         size_pol += sizeof(struct sadb_x_policy);
3567
3568         /* ipsecrequests */
3569         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3570                 /* old locator pair */
3571                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3572                             pfkey_sockaddr_pair_size(mp->old_family);
3573                 /* new locator pair */
3574                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3575                             pfkey_sockaddr_pair_size(mp->new_family);
3576         }
3577
3578         size += sizeof(struct sadb_msg) + size_pol;
3579
3580         /* alloc buffer */
3581         skb = alloc_skb(size, GFP_ATOMIC);
3582         if (skb == NULL)
3583                 return -ENOMEM;
3584
3585         hdr = skb_put(skb, sizeof(struct sadb_msg));
3586         hdr->sadb_msg_version = PF_KEY_V2;
3587         hdr->sadb_msg_type = SADB_X_MIGRATE;
3588         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3589         hdr->sadb_msg_len = size / 8;
3590         hdr->sadb_msg_errno = 0;
3591         hdr->sadb_msg_reserved = 0;
3592         hdr->sadb_msg_seq = 0;
3593         hdr->sadb_msg_pid = 0;
3594
3595         /* Addresses to be used by KM for negotiation, if ext is available */
3596         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3597                 goto err;
3598
3599         /* selector src */
3600         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3601
3602         /* selector dst */
3603         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3604
3605         /* policy information */
3606         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3607         pol->sadb_x_policy_len = size_pol / 8;
3608         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3609         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3610         pol->sadb_x_policy_dir = dir + 1;
3611         pol->sadb_x_policy_reserved = 0;
3612         pol->sadb_x_policy_id = 0;
3613         pol->sadb_x_policy_priority = 0;
3614
3615         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3616                 /* old ipsecrequest */
3617                 int mode = pfkey_mode_from_xfrm(mp->mode);
3618                 if (mode < 0)
3619                         goto err;
3620                 if (set_ipsecrequest(skb, mp->proto, mode,
3621                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3622                                      mp->reqid, mp->old_family,
3623                                      &mp->old_saddr, &mp->old_daddr) < 0)
3624                         goto err;
3625
3626                 /* new ipsecrequest */
3627                 if (set_ipsecrequest(skb, mp->proto, mode,
3628                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3629                                      mp->reqid, mp->new_family,
3630                                      &mp->new_saddr, &mp->new_daddr) < 0)
3631                         goto err;
3632         }
3633
3634         /* broadcast migrate message to sockets */
3635         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3636
3637         return 0;
3638
3639 err:
3640         kfree_skb(skb);
3641         return -EINVAL;
3642 }
3643 #else
3644 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3645                               const struct xfrm_migrate *m, int num_bundles,
3646                               const struct xfrm_kmaddress *k,
3647                               const struct xfrm_encap_tmpl *encap)
3648 {
3649         return -ENOPROTOOPT;
3650 }
3651 #endif
3652
3653 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3654 {
3655         struct sock *sk = sock->sk;
3656         struct sk_buff *skb = NULL;
3657         struct sadb_msg *hdr = NULL;
3658         int err;
3659         struct net *net = sock_net(sk);
3660
3661         err = -EOPNOTSUPP;
3662         if (msg->msg_flags & MSG_OOB)
3663                 goto out;
3664
3665         err = -EMSGSIZE;
3666         if ((unsigned int)len > sk->sk_sndbuf - 32)
3667                 goto out;
3668
3669         err = -ENOBUFS;
3670         skb = alloc_skb(len, GFP_KERNEL);
3671         if (skb == NULL)
3672                 goto out;
3673
3674         err = -EFAULT;
3675         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3676                 goto out;
3677
3678         hdr = pfkey_get_base_msg(skb, &err);
3679         if (!hdr)
3680                 goto out;
3681
3682         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3683         err = pfkey_process(sk, skb, hdr);
3684         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3685
3686 out:
3687         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3688                 err = 0;
3689         kfree_skb(skb);
3690
3691         return err ? : len;
3692 }
3693
3694 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3695                          int flags)
3696 {
3697         struct sock *sk = sock->sk;
3698         struct pfkey_sock *pfk = pfkey_sk(sk);
3699         struct sk_buff *skb;
3700         int copied, err;
3701
3702         err = -EINVAL;
3703         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3704                 goto out;
3705
3706         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3707         if (skb == NULL)
3708                 goto out;
3709
3710         copied = skb->len;
3711         if (copied > len) {
3712                 msg->msg_flags |= MSG_TRUNC;
3713                 copied = len;
3714         }
3715
3716         skb_reset_transport_header(skb);
3717         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3718         if (err)
3719                 goto out_free;
3720
3721         sock_recv_ts_and_drops(msg, sk, skb);
3722
3723         err = (flags & MSG_TRUNC) ? skb->len : copied;
3724
3725         if (pfk->dump.dump != NULL &&
3726             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3727                 pfkey_do_dump(pfk);
3728
3729 out_free:
3730         skb_free_datagram(sk, skb);
3731 out:
3732         return err;
3733 }
3734
3735 static const struct proto_ops pfkey_ops = {
3736         .family         =       PF_KEY,
3737         .owner          =       THIS_MODULE,
3738         /* Operations that make no sense on pfkey sockets. */
3739         .bind           =       sock_no_bind,
3740         .connect        =       sock_no_connect,
3741         .socketpair     =       sock_no_socketpair,
3742         .accept         =       sock_no_accept,
3743         .getname        =       sock_no_getname,
3744         .ioctl          =       sock_no_ioctl,
3745         .listen         =       sock_no_listen,
3746         .shutdown       =       sock_no_shutdown,
3747         .setsockopt     =       sock_no_setsockopt,
3748         .getsockopt     =       sock_no_getsockopt,
3749         .mmap           =       sock_no_mmap,
3750         .sendpage       =       sock_no_sendpage,
3751
3752         /* Now the operations that really occur. */
3753         .release        =       pfkey_release,
3754         .poll_mask      =       datagram_poll_mask,
3755         .sendmsg        =       pfkey_sendmsg,
3756         .recvmsg        =       pfkey_recvmsg,
3757 };
3758
3759 static const struct net_proto_family pfkey_family_ops = {
3760         .family =       PF_KEY,
3761         .create =       pfkey_create,
3762         .owner  =       THIS_MODULE,
3763 };
3764
3765 #ifdef CONFIG_PROC_FS
3766 static int pfkey_seq_show(struct seq_file *f, void *v)
3767 {
3768         struct sock *s = sk_entry(v);
3769
3770         if (v == SEQ_START_TOKEN)
3771                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3772         else
3773                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3774                                s,
3775                                refcount_read(&s->sk_refcnt),
3776                                sk_rmem_alloc_get(s),
3777                                sk_wmem_alloc_get(s),
3778                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3779                                sock_i_ino(s)
3780                                );
3781         return 0;
3782 }
3783
3784 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3785         __acquires(rcu)
3786 {
3787         struct net *net = seq_file_net(f);
3788         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3789
3790         rcu_read_lock();
3791         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3792 }
3793
3794 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3795 {
3796         struct net *net = seq_file_net(f);
3797         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3798
3799         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3800 }
3801
3802 static void pfkey_seq_stop(struct seq_file *f, void *v)
3803         __releases(rcu)
3804 {
3805         rcu_read_unlock();
3806 }
3807
3808 static const struct seq_operations pfkey_seq_ops = {
3809         .start  = pfkey_seq_start,
3810         .next   = pfkey_seq_next,
3811         .stop   = pfkey_seq_stop,
3812         .show   = pfkey_seq_show,
3813 };
3814
3815 static int __net_init pfkey_init_proc(struct net *net)
3816 {
3817         struct proc_dir_entry *e;
3818
3819         e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops,
3820                         sizeof(struct seq_net_private));
3821         if (e == NULL)
3822                 return -ENOMEM;
3823
3824         return 0;
3825 }
3826
3827 static void __net_exit pfkey_exit_proc(struct net *net)
3828 {
3829         remove_proc_entry("pfkey", net->proc_net);
3830 }
3831 #else
3832 static inline int pfkey_init_proc(struct net *net)
3833 {
3834         return 0;
3835 }
3836
3837 static inline void pfkey_exit_proc(struct net *net)
3838 {
3839 }
3840 #endif
3841
3842 static struct xfrm_mgr pfkeyv2_mgr =
3843 {
3844         .notify         = pfkey_send_notify,
3845         .acquire        = pfkey_send_acquire,
3846         .compile_policy = pfkey_compile_policy,
3847         .new_mapping    = pfkey_send_new_mapping,
3848         .notify_policy  = pfkey_send_policy_notify,
3849         .migrate        = pfkey_send_migrate,
3850         .is_alive       = pfkey_is_alive,
3851 };
3852
3853 static int __net_init pfkey_net_init(struct net *net)
3854 {
3855         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3856         int rv;
3857
3858         INIT_HLIST_HEAD(&net_pfkey->table);
3859         atomic_set(&net_pfkey->socks_nr, 0);
3860
3861         rv = pfkey_init_proc(net);
3862
3863         return rv;
3864 }
3865
3866 static void __net_exit pfkey_net_exit(struct net *net)
3867 {
3868         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3869
3870         pfkey_exit_proc(net);
3871         WARN_ON(!hlist_empty(&net_pfkey->table));
3872 }
3873
3874 static struct pernet_operations pfkey_net_ops = {
3875         .init = pfkey_net_init,
3876         .exit = pfkey_net_exit,
3877         .id   = &pfkey_net_id,
3878         .size = sizeof(struct netns_pfkey),
3879 };
3880
3881 static void __exit ipsec_pfkey_exit(void)
3882 {
3883         xfrm_unregister_km(&pfkeyv2_mgr);
3884         sock_unregister(PF_KEY);
3885         unregister_pernet_subsys(&pfkey_net_ops);
3886         proto_unregister(&key_proto);
3887 }
3888
3889 static int __init ipsec_pfkey_init(void)
3890 {
3891         int err = proto_register(&key_proto, 0);
3892
3893         if (err != 0)
3894                 goto out;
3895
3896         err = register_pernet_subsys(&pfkey_net_ops);
3897         if (err != 0)
3898                 goto out_unregister_key_proto;
3899         err = sock_register(&pfkey_family_ops);
3900         if (err != 0)
3901                 goto out_unregister_pernet;
3902         err = xfrm_register_km(&pfkeyv2_mgr);
3903         if (err != 0)
3904                 goto out_sock_unregister;
3905 out:
3906         return err;
3907
3908 out_sock_unregister:
3909         sock_unregister(PF_KEY);
3910 out_unregister_pernet:
3911         unregister_pernet_subsys(&pfkey_net_ops);
3912 out_unregister_key_proto:
3913         proto_unregister(&key_proto);
3914         goto out;
3915 }
3916
3917 module_init(ipsec_pfkey_init);
3918 module_exit(ipsec_pfkey_exit);
3919 MODULE_LICENSE("GPL");
3920 MODULE_ALIAS_NETPROTO(PF_KEY);