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, gfp_t allocation,
 200                                struct sock *sk)
 201 {
 202         int err = -ENOBUFS;
 203
 204         if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
 205                 return err;
 206
 207         skb = skb_clone(skb, allocation);
 208
 209         if (skb) {
 210                 skb_set_owner_r(skb, sk);
 211                 skb_queue_tail(&sk->sk_receive_queue, skb);
 212                 sk->sk_data_ready(sk);
 213                 err = 0;
 214         }
 215         return err;
 216 }
 217
 218 /* Send SKB to all pfkey sockets matching selected criteria.  */
 219 #define BROADCAST_ALL           0
 220 #define BROADCAST_ONE           1
 221 #define BROADCAST_REGISTERED    2
 222 #define BROADCAST_PROMISC_ONLY  4
 223 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 224                            int broadcast_flags, struct sock *one_sk,
 225                            struct net *net)
 226 {
 227         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 228         struct sock *sk;
 229         int err = -ESRCH;
 230
 231         /* XXX Do we need something like netlink_overrun?  I think
 232          * XXX PF_KEY socket apps will not mind current behavior.
 233          */
 234         if (!skb)
 235                 return -ENOMEM;
 236
 237         rcu_read_lock();
 238         sk_for_each_rcu(sk, &net_pfkey->table) {
 239                 struct pfkey_sock *pfk = pfkey_sk(sk);
 240                 int err2;
 241
 242                 /* Yes, it means that if you are meant to receive this
 243                  * pfkey message you receive it twice as promiscuous
 244                  * socket.
 245                  */
 246                 if (pfk->promisc)
 247                         pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 248
 249                 /* the exact target will be processed later */
 250                 if (sk == one_sk)
 251                         continue;
 252                 if (broadcast_flags != BROADCAST_ALL) {
 253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 254                                 continue;
 255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 256                             !pfk->registered)
 257                                 continue;
 258                         if (broadcast_flags & BROADCAST_ONE)
 259                                 continue;
 260                 }
 261
 262                 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk);
 263
 264                 /* Error is cleared after successful sending to at least one
 265                  * registered KM */
 266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 267                         err = err2;
 268         }
 269         rcu_read_unlock();
 270
 271         if (one_sk != NULL)
 272                 err = pfkey_broadcast_one(skb, allocation, one_sk);
 273
 274         kfree_skb(skb);
 275         return err;
 276 }
 277
 278 static int pfkey_do_dump(struct pfkey_sock *pfk)
 279 {
 280         struct sadb_msg *hdr;
 281         int rc;
 282
 283         mutex_lock(&pfk->dump_lock);
 284         if (!pfk->dump.dump) {
 285                 rc = 0;
 286                 goto out;
 287         }
 288
 289         rc = pfk->dump.dump(pfk);
 290         if (rc == -ENOBUFS) {
 291                 rc = 0;
 292                 goto out;
 293         }
 294
 295         if (pfk->dump.skb) {
 296                 if (!pfkey_can_dump(&pfk->sk)) {
 297                         rc = 0;
 298                         goto out;
 299                 }
 300
 301                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 302                 hdr->sadb_msg_seq = 0;
 303                 hdr->sadb_msg_errno = rc;
 304                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 305                                 &pfk->sk, sock_net(&pfk->sk));
 306                 pfk->dump.skb = NULL;
 307         }
 308
 309         pfkey_terminate_dump(pfk);
 310
 311 out:
 312         mutex_unlock(&pfk->dump_lock);
 313         return rc;
 314 }
 315
 316 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 317                                  const struct sadb_msg *orig)
 318 {
 319         *new = *orig;
 320 }
 321
 322 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 323 {
 324         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 325         struct sadb_msg *hdr;
 326
 327         if (!skb)
 328                 return -ENOBUFS;
 329
 330         /* Woe be to the platform trying to support PFKEY yet
 331          * having normal errnos outside the 1-255 range, inclusive.
 332          */
 333         err = -err;
 334         if (err == ERESTARTSYS ||
 335             err == ERESTARTNOHAND ||
 336             err == ERESTARTNOINTR)
 337                 err = EINTR;
 338         if (err >= 512)
 339                 err = EINVAL;
 340         BUG_ON(err <= 0 || err >= 256);
 341
 342         hdr = skb_put(skb, sizeof(struct sadb_msg));
 343         pfkey_hdr_dup(hdr, orig);
 344         hdr->sadb_msg_errno = (uint8_t) err;
 345         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 346                              sizeof(uint64_t));
 347
 348         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 349
 350         return 0;
 351 }
 352
 353 static const u8 sadb_ext_min_len[] = {
 354         [SADB_EXT_RESERVED]             = (u8) 0,
 355         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 356         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 357         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 358         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 359         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 360         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 361         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 362         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 363         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 364         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 365         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 366         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 367         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 368         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 369         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 370         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 371         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 372         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 373         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 374         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 375         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 376         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 377         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 378         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 379         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 380         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 381 };
 382
 383 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 384 static int verify_address_len(const void *p)
 385 {
 386         const struct sadb_address *sp = p;
 387         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 388         const struct sockaddr_in *sin;
 389 #if IS_ENABLED(CONFIG_IPV6)
 390         const struct sockaddr_in6 *sin6;
 391 #endif
 392         int len;
 393
 394         if (sp->sadb_address_len <
 395             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 396                          sizeof(uint64_t)))
 397                 return -EINVAL;
 398
 399         switch (addr->sa_family) {
 400         case AF_INET:
 401                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 402                 if (sp->sadb_address_len != len ||
 403                     sp->sadb_address_prefixlen > 32)
 404                         return -EINVAL;
 405                 break;
 406 #if IS_ENABLED(CONFIG_IPV6)
 407         case AF_INET6:
 408                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 409                 if (sp->sadb_address_len != len ||
 410                     sp->sadb_address_prefixlen > 128)
 411                         return -EINVAL;
 412                 break;
 413 #endif
 414         default:
 415                 /* It is user using kernel to keep track of security
 416                  * associations for another protocol, such as
 417                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 418                  * lengths.
 419                  *
 420                  * XXX Actually, association/policy database is not yet
 421                  * XXX able to cope with arbitrary sockaddr families.
 422                  * XXX When it can, remove this -EINVAL.  -DaveM
 423                  */
 424                 return -EINVAL;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static inline int sadb_key_len(const struct sadb_key *key)
 431 {
 432         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 433
 434         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 435                             sizeof(uint64_t));
 436 }
 437
 438 static int verify_key_len(const void *p)
 439 {
 440         const struct sadb_key *key = p;
 441
 442         if (sadb_key_len(key) > key->sadb_key_len)
 443                 return -EINVAL;
 444
 445         return 0;
 446 }
 447
 448 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 449 {
 450         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 451                             sec_ctx->sadb_x_ctx_len,
 452                             sizeof(uint64_t));
 453 }
 454
 455 static inline int verify_sec_ctx_len(const void *p)
 456 {
 457         const struct sadb_x_sec_ctx *sec_ctx = p;
 458         int len = sec_ctx->sadb_x_ctx_len;
 459
 460         if (len > PAGE_SIZE)
 461                 return -EINVAL;
 462
 463         len = pfkey_sec_ctx_len(sec_ctx);
 464
 465         if (sec_ctx->sadb_x_sec_len != len)
 466                 return -EINVAL;
 467
 468         return 0;
 469 }
 470
 471 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 472                                                                      gfp_t gfp)
 473 {
 474         struct xfrm_user_sec_ctx *uctx = NULL;
 475         int ctx_size = sec_ctx->sadb_x_ctx_len;
 476
 477         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 478
 479         if (!uctx)
 480                 return NULL;
 481
 482         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 483         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 484         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 485         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 486         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 487         memcpy(uctx + 1, sec_ctx + 1,
 488                uctx->ctx_len);
 489
 490         return uctx;
 491 }
 492
 493 static int present_and_same_family(const struct sadb_address *src,
 494                                    const struct sadb_address *dst)
 495 {
 496         const struct sockaddr *s_addr, *d_addr;
 497
 498         if (!src || !dst)
 499                 return 0;
 500
 501         s_addr = (const struct sockaddr *)(src + 1);
 502         d_addr = (const struct sockaddr *)(dst + 1);
 503         if (s_addr->sa_family != d_addr->sa_family)
 504                 return 0;
 505         if (s_addr->sa_family != AF_INET
 506 #if IS_ENABLED(CONFIG_IPV6)
 507             && s_addr->sa_family != AF_INET6
 508 #endif
 509                 )
 510                 return 0;
 511
 512         return 1;
 513 }
 514
 515 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 516 {
 517         const char *p = (char *) hdr;
 518         int len = skb->len;
 519
 520         len -= sizeof(*hdr);
 521         p += sizeof(*hdr);
 522         while (len > 0) {
 523                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 524                 uint16_t ext_type;
 525                 int ext_len;
 526
 527                 if (len < sizeof(*ehdr))
 528                         return -EINVAL;
 529
 530                 ext_len  = ehdr->sadb_ext_len;
 531                 ext_len *= sizeof(uint64_t);
 532                 ext_type = ehdr->sadb_ext_type;
 533                 if (ext_len < sizeof(uint64_t) ||
 534                     ext_len > len ||
 535                     ext_type == SADB_EXT_RESERVED)
 536                         return -EINVAL;
 537
 538                 if (ext_type <= SADB_EXT_MAX) {
 539                         int min = (int) sadb_ext_min_len[ext_type];
 540                         if (ext_len < min)
 541                                 return -EINVAL;
 542                         if (ext_hdrs[ext_type-1] != NULL)
 543                                 return -EINVAL;
 544                         switch (ext_type) {
 545                         case SADB_EXT_ADDRESS_SRC:
 546                         case SADB_EXT_ADDRESS_DST:
 547                         case SADB_EXT_ADDRESS_PROXY:
 548                         case SADB_X_EXT_NAT_T_OA:
 549                                 if (verify_address_len(p))
 550                                         return -EINVAL;
 551                                 break;
 552                         case SADB_X_EXT_SEC_CTX:
 553                                 if (verify_sec_ctx_len(p))
 554                                         return -EINVAL;
 555                                 break;
 556                         case SADB_EXT_KEY_AUTH:
 557                         case SADB_EXT_KEY_ENCRYPT:
 558                                 if (verify_key_len(p))
 559                                         return -EINVAL;
 560                                 break;
 561                         default:
 562                                 break;
 563                         }
 564                         ext_hdrs[ext_type-1] = (void *) p;
 565                 }
 566                 p   += ext_len;
 567                 len -= ext_len;
 568         }
 569
 570         return 0;
 571 }
 572
 573 static uint16_t
 574 pfkey_satype2proto(uint8_t satype)
 575 {
 576         switch (satype) {
 577         case SADB_SATYPE_UNSPEC:
 578                 return IPSEC_PROTO_ANY;
 579         case SADB_SATYPE_AH:
 580                 return IPPROTO_AH;
 581         case SADB_SATYPE_ESP:
 582                 return IPPROTO_ESP;
 583         case SADB_X_SATYPE_IPCOMP:
 584                 return IPPROTO_COMP;
 585         default:
 586                 return 0;
 587         }
 588         /* NOTREACHED */
 589 }
 590
 591 static uint8_t
 592 pfkey_proto2satype(uint16_t proto)
 593 {
 594         switch (proto) {
 595         case IPPROTO_AH:
 596                 return SADB_SATYPE_AH;
 597         case IPPROTO_ESP:
 598                 return SADB_SATYPE_ESP;
 599         case IPPROTO_COMP:
 600                 return SADB_X_SATYPE_IPCOMP;
 601         default:
 602                 return 0;
 603         }
 604         /* NOTREACHED */
 605 }
 606
 607 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 608  * say specifically 'just raw sockets' as we encode them as 255.
 609  */
 610
 611 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 612 {
 613         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 614 }
 615
 616 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 617 {
 618         return proto ? proto : IPSEC_PROTO_ANY;
 619 }
 620
 621 static inline int pfkey_sockaddr_len(sa_family_t family)
 622 {
 623         switch (family) {
 624         case AF_INET:
 625                 return sizeof(struct sockaddr_in);
 626 #if IS_ENABLED(CONFIG_IPV6)
 627         case AF_INET6:
 628                 return sizeof(struct sockaddr_in6);
 629 #endif
 630         }
 631         return 0;
 632 }
 633
 634 static
 635 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 636 {
 637         switch (sa->sa_family) {
 638         case AF_INET:
 639                 xaddr->a4 =
 640                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 641                 return AF_INET;
 642 #if IS_ENABLED(CONFIG_IPV6)
 643         case AF_INET6:
 644                 memcpy(xaddr->a6,
 645                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 646                        sizeof(struct in6_addr));
 647                 return AF_INET6;
 648 #endif
 649         }
 650         return 0;
 651 }
 652
 653 static
 654 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 655 {
 656         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 657                                       xaddr);
 658 }
 659
 660 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 661 {
 662         const struct sadb_sa *sa;
 663         const struct sadb_address *addr;
 664         uint16_t proto;
 665         unsigned short family;
 666         xfrm_address_t *xaddr;
 667
 668         sa = ext_hdrs[SADB_EXT_SA - 1];
 669         if (sa == NULL)
 670                 return NULL;
 671
 672         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 673         if (proto == 0)
 674                 return NULL;
 675
 676         /* sadb_address_len should be checked by caller */
 677         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 678         if (addr == NULL)
 679                 return NULL;
 680
 681         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 682         switch (family) {
 683         case AF_INET:
 684                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 685                 break;
 686 #if IS_ENABLED(CONFIG_IPV6)
 687         case AF_INET6:
 688                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 689                 break;
 690 #endif
 691         default:
 692                 xaddr = NULL;
 693         }
 694
 695         if (!xaddr)
 696                 return NULL;
 697
 698         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 699 }
 700
 701 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 702
 703 static int
 704 pfkey_sockaddr_size(sa_family_t family)
 705 {
 706         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 707 }
 708
 709 static inline int pfkey_mode_from_xfrm(int mode)
 710 {
 711         switch(mode) {
 712         case XFRM_MODE_TRANSPORT:
 713                 return IPSEC_MODE_TRANSPORT;
 714         case XFRM_MODE_TUNNEL:
 715                 return IPSEC_MODE_TUNNEL;
 716         case XFRM_MODE_BEET:
 717                 return IPSEC_MODE_BEET;
 718         default:
 719                 return -1;
 720         }
 721 }
 722
 723 static inline int pfkey_mode_to_xfrm(int mode)
 724 {
 725         switch(mode) {
 726         case IPSEC_MODE_ANY:    /*XXX*/
 727         case IPSEC_MODE_TRANSPORT:
 728                 return XFRM_MODE_TRANSPORT;
 729         case IPSEC_MODE_TUNNEL:
 730                 return XFRM_MODE_TUNNEL;
 731         case IPSEC_MODE_BEET:
 732                 return XFRM_MODE_BEET;
 733         default:
 734                 return -1;
 735         }
 736 }
 737
 738 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 739                                         struct sockaddr *sa,
 740                                         unsigned short family)
 741 {
 742         switch (family) {
 743         case AF_INET:
 744             {
 745                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 746                 sin->sin_family = AF_INET;
 747                 sin->sin_port = port;
 748                 sin->sin_addr.s_addr = xaddr->a4;
 749                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 750                 return 32;
 751             }
 752 #if IS_ENABLED(CONFIG_IPV6)
 753         case AF_INET6:
 754             {
 755                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 756                 sin6->sin6_family = AF_INET6;
 757                 sin6->sin6_port = port;
 758                 sin6->sin6_flowinfo = 0;
 759                 sin6->sin6_addr = xaddr->in6;
 760                 sin6->sin6_scope_id = 0;
 761                 return 128;
 762             }
 763 #endif
 764         }
 765         return 0;
 766 }
 767
 768 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 769                                               int add_keys, int hsc)
 770 {
 771         struct sk_buff *skb;
 772         struct sadb_msg *hdr;
 773         struct sadb_sa *sa;
 774         struct sadb_lifetime *lifetime;
 775         struct sadb_address *addr;
 776         struct sadb_key *key;
 777         struct sadb_x_sa2 *sa2;
 778         struct sadb_x_sec_ctx *sec_ctx;
 779         struct xfrm_sec_ctx *xfrm_ctx;
 780         int ctx_size = 0;
 781         int size;
 782         int auth_key_size = 0;
 783         int encrypt_key_size = 0;
 784         int sockaddr_size;
 785         struct xfrm_encap_tmpl *natt = NULL;
 786         int mode;
 787
 788         /* address family check */
 789         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 790         if (!sockaddr_size)
 791                 return ERR_PTR(-EINVAL);
 792
 793         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 794            key(AE), (identity(SD),) (sensitivity)> */
 795         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 796                 sizeof(struct sadb_lifetime) +
 797                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 798                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 799                         sizeof(struct sadb_address)*2 +
 800                                 sockaddr_size*2 +
 801                                         sizeof(struct sadb_x_sa2);
 802
 803         if ((xfrm_ctx = x->security)) {
 804                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 805                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 806         }
 807
 808         /* identity & sensitivity */
 809         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 810                 size += sizeof(struct sadb_address) + sockaddr_size;
 811
 812         if (add_keys) {
 813                 if (x->aalg && x->aalg->alg_key_len) {
 814                         auth_key_size =
 815                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 816                         size += sizeof(struct sadb_key) + auth_key_size;
 817                 }
 818                 if (x->ealg && x->ealg->alg_key_len) {
 819                         encrypt_key_size =
 820                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 821                         size += sizeof(struct sadb_key) + encrypt_key_size;
 822                 }
 823         }
 824         if (x->encap)
 825                 natt = x->encap;
 826
 827         if (natt && natt->encap_type) {
 828                 size += sizeof(struct sadb_x_nat_t_type);
 829                 size += sizeof(struct sadb_x_nat_t_port);
 830                 size += sizeof(struct sadb_x_nat_t_port);
 831         }
 832
 833         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 834         if (skb == NULL)
 835                 return ERR_PTR(-ENOBUFS);
 836
 837         /* call should fill header later */
 838         hdr = skb_put(skb, sizeof(struct sadb_msg));
 839         memset(hdr, 0, size);   /* XXX do we need this ? */
 840         hdr->sadb_msg_len = size / sizeof(uint64_t);
 841
 842         /* sa */
 843         sa = skb_put(skb, sizeof(struct sadb_sa));
 844         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 845         sa->sadb_sa_exttype = SADB_EXT_SA;
 846         sa->sadb_sa_spi = x->id.spi;
 847         sa->sadb_sa_replay = x->props.replay_window;
 848         switch (x->km.state) {
 849         case XFRM_STATE_VALID:
 850                 sa->sadb_sa_state = x->km.dying ?
 851                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 852                 break;
 853         case XFRM_STATE_ACQ:
 854                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 855                 break;
 856         default:
 857                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 858                 break;
 859         }
 860         sa->sadb_sa_auth = 0;
 861         if (x->aalg) {
 862                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 863                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 864                                         a->desc.sadb_alg_id : 0;
 865         }
 866         sa->sadb_sa_encrypt = 0;
 867         BUG_ON(x->ealg && x->calg);
 868         if (x->ealg) {
 869                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 870                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 871                                         a->desc.sadb_alg_id : 0;
 872         }
 873         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 874         if (x->calg) {
 875                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 876                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 877                                         a->desc.sadb_alg_id : 0;
 878         }
 879
 880         sa->sadb_sa_flags = 0;
 881         if (x->props.flags & XFRM_STATE_NOECN)
 882                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 883         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 884                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 885         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 886                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 887
 888         /* hard time */
 889         if (hsc & 2) {
 890                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 891                 lifetime->sadb_lifetime_len =
 892                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 893                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 894                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 895                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 896                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 897                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 898         }
 899         /* soft time */
 900         if (hsc & 1) {
 901                 lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
 902                 lifetime->sadb_lifetime_len =
 903                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 904                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 905                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 906                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 907                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 908                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 909         }
 910         /* current time */
 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_CURRENT;
 915         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 916         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 917         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 918         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 919         /* src address */
 920         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 921         addr->sadb_address_len =
 922                 (sizeof(struct sadb_address)+sockaddr_size)/
 923                         sizeof(uint64_t);
 924         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 925         /* "if the ports are non-zero, then the sadb_address_proto field,
 926            normally zero, MUST be filled in with the transport
 927            protocol's number." - RFC2367 */
 928         addr->sadb_address_proto = 0;
 929         addr->sadb_address_reserved = 0;
 930
 931         addr->sadb_address_prefixlen =
 932                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 933                                     (struct sockaddr *) (addr + 1),
 934                                     x->props.family);
 935         if (!addr->sadb_address_prefixlen)
 936                 BUG();
 937
 938         /* dst address */
 939         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
 940         addr->sadb_address_len =
 941                 (sizeof(struct sadb_address)+sockaddr_size)/
 942                         sizeof(uint64_t);
 943         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 944         addr->sadb_address_proto = 0;
 945         addr->sadb_address_reserved = 0;
 946
 947         addr->sadb_address_prefixlen =
 948                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 949                                     (struct sockaddr *) (addr + 1),
 950                                     x->props.family);
 951         if (!addr->sadb_address_prefixlen)
 952                 BUG();
 953
 954         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 955                              x->props.family)) {
 956                 addr = skb_put(skb,
 957                                sizeof(struct sadb_address) + sockaddr_size);
 958                 addr->sadb_address_len =
 959                         (sizeof(struct sadb_address)+sockaddr_size)/
 960                         sizeof(uint64_t);
 961                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 962                 addr->sadb_address_proto =
 963                         pfkey_proto_from_xfrm(x->sel.proto);
 964                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 965                 addr->sadb_address_reserved = 0;
 966
 967                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 968                                     (struct sockaddr *) (addr + 1),
 969                                     x->props.family);
 970         }
 971
 972         /* auth key */
 973         if (add_keys && auth_key_size) {
 974                 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size);
 975                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 976                         sizeof(uint64_t);
 977                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 978                 key->sadb_key_bits = x->aalg->alg_key_len;
 979                 key->sadb_key_reserved = 0;
 980                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 981         }
 982         /* encrypt key */
 983         if (add_keys && encrypt_key_size) {
 984                 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size);
 985                 key->sadb_key_len = (sizeof(struct sadb_key) +
 986                                      encrypt_key_size) / sizeof(uint64_t);
 987                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 988                 key->sadb_key_bits = x->ealg->alg_key_len;
 989                 key->sadb_key_reserved = 0;
 990                 memcpy(key + 1, x->ealg->alg_key,
 991                        (x->ealg->alg_key_len+7)/8);
 992         }
 993
 994         /* sa */
 995         sa2 = skb_put(skb, sizeof(struct sadb_x_sa2));
 996         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 997         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 998         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 999                 kfree_skb(skb);
1000                 return ERR_PTR(-EINVAL);
1001         }
1002         sa2->sadb_x_sa2_mode = mode;
1003         sa2->sadb_x_sa2_reserved1 = 0;
1004         sa2->sadb_x_sa2_reserved2 = 0;
1005         sa2->sadb_x_sa2_sequence = 0;
1006         sa2->sadb_x_sa2_reqid = x->props.reqid;
1007
1008         if (natt && natt->encap_type) {
1009                 struct sadb_x_nat_t_type *n_type;
1010                 struct sadb_x_nat_t_port *n_port;
1011
1012                 /* type */
1013                 n_type = skb_put(skb, sizeof(*n_type));
1014                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1015                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1016                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1017                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1018                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1019                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1020
1021                 /* source port */
1022                 n_port = skb_put(skb, sizeof(*n_port));
1023                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1024                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1026                 n_port->sadb_x_nat_t_port_reserved = 0;
1027
1028                 /* dest port */
1029                 n_port = skb_put(skb, sizeof(*n_port));
1030                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1031                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1032                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1033                 n_port->sadb_x_nat_t_port_reserved = 0;
1034         }
1035
1036         /* security context */
1037         if (xfrm_ctx) {
1038                 sec_ctx = skb_put(skb,
1039                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
1040                 sec_ctx->sadb_x_sec_len =
1041                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1042                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1043                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1044                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1045                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1046                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1047                        xfrm_ctx->ctx_len);
1048         }
1049
1050         return skb;
1051 }
1052
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1055 {
1056         struct sk_buff *skb;
1057
1058         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1059
1060         return skb;
1061 }
1062
1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1064                                                           int hsc)
1065 {
1066         return __pfkey_xfrm_state2msg(x, 0, hsc);
1067 }
1068
1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1070                                                 const struct sadb_msg *hdr,
1071                                                 void * const *ext_hdrs)
1072 {
1073         struct xfrm_state *x;
1074         const struct sadb_lifetime *lifetime;
1075         const struct sadb_sa *sa;
1076         const struct sadb_key *key;
1077         const struct sadb_x_sec_ctx *sec_ctx;
1078         uint16_t proto;
1079         int err;
1080
1081
1082         sa = ext_hdrs[SADB_EXT_SA - 1];
1083         if (!sa ||
1084             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1085                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1086                 return ERR_PTR(-EINVAL);
1087         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1088             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1089                 return ERR_PTR(-EINVAL);
1090         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1091             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1092                 return ERR_PTR(-EINVAL);
1093         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1094             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1095                 return ERR_PTR(-EINVAL);
1096
1097         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1098         if (proto == 0)
1099                 return ERR_PTR(-EINVAL);
1100
1101         /* default error is no buffer space */
1102         err = -ENOBUFS;
1103
1104         /* RFC2367:
1105
1106    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1107    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1108    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1109    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1110    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1111    not true.
1112
1113            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1114            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1115          */
1116         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1117             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1118              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1119             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1120                 return ERR_PTR(-EINVAL);
1121         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1122         if (key != NULL &&
1123             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1124             key->sadb_key_bits == 0)
1125                 return ERR_PTR(-EINVAL);
1126         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1127         if (key != NULL &&
1128             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1129             key->sadb_key_bits == 0)
1130                 return ERR_PTR(-EINVAL);
1131
1132         x = xfrm_state_alloc(net);
1133         if (x == NULL)
1134                 return ERR_PTR(-ENOBUFS);
1135
1136         x->id.proto = proto;
1137         x->id.spi = sa->sadb_sa_spi;
1138         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1139                                         (sizeof(x->replay.bitmap) * 8));
1140         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1141                 x->props.flags |= XFRM_STATE_NOECN;
1142         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1143                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1144         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1145                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1146
1147         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1148         if (lifetime != NULL) {
1149                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1150                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1151                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1152                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1153         }
1154         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1155         if (lifetime != NULL) {
1156                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1157                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1158                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1159                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1160         }
1161
1162         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1163         if (sec_ctx != NULL) {
1164                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1165
1166                 if (!uctx)
1167                         goto out;
1168
1169                 err = security_xfrm_state_alloc(x, uctx);
1170                 kfree(uctx);
1171
1172                 if (err)
1173                         goto out;
1174         }
1175
1176         err = -ENOBUFS;
1177         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1178         if (sa->sadb_sa_auth) {
1179                 int keysize = 0;
1180                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1181                 if (!a || !a->pfkey_supported) {
1182                         err = -ENOSYS;
1183                         goto out;
1184                 }
1185                 if (key)
1186                         keysize = (key->sadb_key_bits + 7) / 8;
1187                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1188                 if (!x->aalg) {
1189                         err = -ENOMEM;
1190                         goto out;
1191                 }
1192                 strcpy(x->aalg->alg_name, a->name);
1193                 x->aalg->alg_key_len = 0;
1194                 if (key) {
1195                         x->aalg->alg_key_len = key->sadb_key_bits;
1196                         memcpy(x->aalg->alg_key, key+1, keysize);
1197                 }
1198                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1199                 x->props.aalgo = sa->sadb_sa_auth;
1200                 /* x->algo.flags = sa->sadb_sa_flags; */
1201         }
1202         if (sa->sadb_sa_encrypt) {
1203                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1204                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1205                         if (!a || !a->pfkey_supported) {
1206                                 err = -ENOSYS;
1207                                 goto out;
1208                         }
1209                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1210                         if (!x->calg) {
1211                                 err = -ENOMEM;
1212                                 goto out;
1213                         }
1214                         strcpy(x->calg->alg_name, a->name);
1215                         x->props.calgo = sa->sadb_sa_encrypt;
1216                 } else {
1217                         int keysize = 0;
1218                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1219                         if (!a || !a->pfkey_supported) {
1220                                 err = -ENOSYS;
1221                                 goto out;
1222                         }
1223                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1224                         if (key)
1225                                 keysize = (key->sadb_key_bits + 7) / 8;
1226                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1227                         if (!x->ealg) {
1228                                 err = -ENOMEM;
1229                                 goto out;
1230                         }
1231                         strcpy(x->ealg->alg_name, a->name);
1232                         x->ealg->alg_key_len = 0;
1233                         if (key) {
1234                                 x->ealg->alg_key_len = key->sadb_key_bits;
1235                                 memcpy(x->ealg->alg_key, key+1, keysize);
1236                         }
1237                         x->props.ealgo = sa->sadb_sa_encrypt;
1238                         x->geniv = a->uinfo.encr.geniv;
1239                 }
1240         }
1241         /* x->algo.flags = sa->sadb_sa_flags; */
1242
1243         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1244                                                     &x->props.saddr);
1245         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1246                                   &x->id.daddr);
1247
1248         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1249                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1250                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1251                 if (mode < 0) {
1252                         err = -EINVAL;
1253                         goto out;
1254                 }
1255                 x->props.mode = mode;
1256                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1257         }
1258
1259         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1260                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1261
1262                 /* Nobody uses this, but we try. */
1263                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1264                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1265         }
1266
1267         if (!x->sel.family)
1268                 x->sel.family = x->props.family;
1269
1270         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1271                 const struct sadb_x_nat_t_type* n_type;
1272                 struct xfrm_encap_tmpl *natt;
1273
1274                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1275                 if (!x->encap) {
1276                         err = -ENOMEM;
1277                         goto out;
1278                 }
1279
1280                 natt = x->encap;
1281                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1282                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1283
1284                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1285                         const struct sadb_x_nat_t_port *n_port =
1286                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1287                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1288                 }
1289                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1290                         const struct sadb_x_nat_t_port *n_port =
1291                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1292                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1293                 }
1294                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1295         }
1296
1297         err = xfrm_init_state(x);
1298         if (err)
1299                 goto out;
1300
1301         x->km.seq = hdr->sadb_msg_seq;
1302         return x;
1303
1304 out:
1305         x->km.state = XFRM_STATE_DEAD;
1306         xfrm_state_put(x);
1307         return ERR_PTR(err);
1308 }
1309
1310 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1311 {
1312         return -EOPNOTSUPP;
1313 }
1314
1315 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1316 {
1317         struct net *net = sock_net(sk);
1318         struct sk_buff *resp_skb;
1319         struct sadb_x_sa2 *sa2;
1320         struct sadb_address *saddr, *daddr;
1321         struct sadb_msg *out_hdr;
1322         struct sadb_spirange *range;
1323         struct xfrm_state *x = NULL;
1324         int mode;
1325         int err;
1326         u32 min_spi, max_spi;
1327         u32 reqid;
1328         u8 proto;
1329         unsigned short family;
1330         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1331
1332         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1333                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1334                 return -EINVAL;
1335
1336         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1337         if (proto == 0)
1338                 return -EINVAL;
1339
1340         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1341                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1342                 if (mode < 0)
1343                         return -EINVAL;
1344                 reqid = sa2->sadb_x_sa2_reqid;
1345         } else {
1346                 mode = 0;
1347                 reqid = 0;
1348         }
1349
1350         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1351         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1352
1353         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1354         switch (family) {
1355         case AF_INET:
1356                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1357                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1358                 break;
1359 #if IS_ENABLED(CONFIG_IPV6)
1360         case AF_INET6:
1361                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1362                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1363                 break;
1364 #endif
1365         }
1366
1367         if (hdr->sadb_msg_seq) {
1368                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1369                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1370                         xfrm_state_put(x);
1371                         x = NULL;
1372                 }
1373         }
1374
1375         if (!x)
1376                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1377
1378         if (x == NULL)
1379                 return -ENOENT;
1380
1381         min_spi = 0x100;
1382         max_spi = 0x0fffffff;
1383
1384         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1385         if (range) {
1386                 min_spi = range->sadb_spirange_min;
1387                 max_spi = range->sadb_spirange_max;
1388         }
1389
1390         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1391         if (err) {
1392                 xfrm_state_put(x);
1393                 return err;
1394         }
1395
1396         err = xfrm_alloc_spi(x, min_spi, max_spi);
1397         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1398
1399         if (IS_ERR(resp_skb)) {
1400                 xfrm_state_put(x);
1401                 return  PTR_ERR(resp_skb);
1402         }
1403
1404         out_hdr = (struct sadb_msg *) resp_skb->data;
1405         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1406         out_hdr->sadb_msg_type = SADB_GETSPI;
1407         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1408         out_hdr->sadb_msg_errno = 0;
1409         out_hdr->sadb_msg_reserved = 0;
1410         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1411         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1412
1413         xfrm_state_put(x);
1414
1415         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1416
1417         return 0;
1418 }
1419
1420 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1421 {
1422         struct net *net = sock_net(sk);
1423         struct xfrm_state *x;
1424
1425         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1426                 return -EOPNOTSUPP;
1427
1428         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1429                 return 0;
1430
1431         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1432         if (x == NULL)
1433                 return 0;
1434
1435         spin_lock_bh(&x->lock);
1436         if (x->km.state == XFRM_STATE_ACQ)
1437                 x->km.state = XFRM_STATE_ERROR;
1438
1439         spin_unlock_bh(&x->lock);
1440         xfrm_state_put(x);
1441         return 0;
1442 }
1443
1444 static inline int event2poltype(int event)
1445 {
1446         switch (event) {
1447         case XFRM_MSG_DELPOLICY:
1448                 return SADB_X_SPDDELETE;
1449         case XFRM_MSG_NEWPOLICY:
1450                 return SADB_X_SPDADD;
1451         case XFRM_MSG_UPDPOLICY:
1452                 return SADB_X_SPDUPDATE;
1453         case XFRM_MSG_POLEXPIRE:
1454         //      return SADB_X_SPDEXPIRE;
1455         default:
1456                 pr_err("pfkey: Unknown policy event %d\n", event);
1457                 break;
1458         }
1459
1460         return 0;
1461 }
1462
1463 static inline int event2keytype(int event)
1464 {
1465         switch (event) {
1466         case XFRM_MSG_DELSA:
1467                 return SADB_DELETE;
1468         case XFRM_MSG_NEWSA:
1469                 return SADB_ADD;
1470         case XFRM_MSG_UPDSA:
1471                 return SADB_UPDATE;
1472         case XFRM_MSG_EXPIRE:
1473                 return SADB_EXPIRE;
1474         default:
1475                 pr_err("pfkey: Unknown SA event %d\n", event);
1476                 break;
1477         }
1478
1479         return 0;
1480 }
1481
1482 /* ADD/UPD/DEL */
1483 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1484 {
1485         struct sk_buff *skb;
1486         struct sadb_msg *hdr;
1487
1488         skb = pfkey_xfrm_state2msg(x);
1489
1490         if (IS_ERR(skb))
1491                 return PTR_ERR(skb);
1492
1493         hdr = (struct sadb_msg *) skb->data;
1494         hdr->sadb_msg_version = PF_KEY_V2;
1495         hdr->sadb_msg_type = event2keytype(c->event);
1496         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1497         hdr->sadb_msg_errno = 0;
1498         hdr->sadb_msg_reserved = 0;
1499         hdr->sadb_msg_seq = c->seq;
1500         hdr->sadb_msg_pid = c->portid;
1501
1502         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1503
1504         return 0;
1505 }
1506
1507 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1508 {
1509         struct net *net = sock_net(sk);
1510         struct xfrm_state *x;
1511         int err;
1512         struct km_event c;
1513
1514         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1515         if (IS_ERR(x))
1516                 return PTR_ERR(x);
1517
1518         xfrm_state_hold(x);
1519         if (hdr->sadb_msg_type == SADB_ADD)
1520                 err = xfrm_state_add(x);
1521         else
1522                 err = xfrm_state_update(x);
1523
1524         xfrm_audit_state_add(x, err ? 0 : 1, true);
1525
1526         if (err < 0) {
1527                 x->km.state = XFRM_STATE_DEAD;
1528                 __xfrm_state_put(x);
1529                 goto out;
1530         }
1531
1532         if (hdr->sadb_msg_type == SADB_ADD)
1533                 c.event = XFRM_MSG_NEWSA;
1534         else
1535                 c.event = XFRM_MSG_UPDSA;
1536         c.seq = hdr->sadb_msg_seq;
1537         c.portid = hdr->sadb_msg_pid;
1538         km_state_notify(x, &c);
1539 out:
1540         xfrm_state_put(x);
1541         return err;
1542 }
1543
1544 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1545 {
1546         struct net *net = sock_net(sk);
1547         struct xfrm_state *x;
1548         struct km_event c;
1549         int err;
1550
1551         if (!ext_hdrs[SADB_EXT_SA-1] ||
1552             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1553                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1554                 return -EINVAL;
1555
1556         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1557         if (x == NULL)
1558                 return -ESRCH;
1559
1560         if ((err = security_xfrm_state_delete(x)))
1561                 goto out;
1562
1563         if (xfrm_state_kern(x)) {
1564                 err = -EPERM;
1565                 goto out;
1566         }
1567
1568         err = xfrm_state_delete(x);
1569
1570         if (err < 0)
1571                 goto out;
1572
1573         c.seq = hdr->sadb_msg_seq;
1574         c.portid = hdr->sadb_msg_pid;
1575         c.event = XFRM_MSG_DELSA;
1576         km_state_notify(x, &c);
1577 out:
1578         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1579         xfrm_state_put(x);
1580
1581         return err;
1582 }
1583
1584 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1585 {
1586         struct net *net = sock_net(sk);
1587         __u8 proto;
1588         struct sk_buff *out_skb;
1589         struct sadb_msg *out_hdr;
1590         struct xfrm_state *x;
1591
1592         if (!ext_hdrs[SADB_EXT_SA-1] ||
1593             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1594                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1595                 return -EINVAL;
1596
1597         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1598         if (x == NULL)
1599                 return -ESRCH;
1600
1601         out_skb = pfkey_xfrm_state2msg(x);
1602         proto = x->id.proto;
1603         xfrm_state_put(x);
1604         if (IS_ERR(out_skb))
1605                 return  PTR_ERR(out_skb);
1606
1607         out_hdr = (struct sadb_msg *) out_skb->data;
1608         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1609         out_hdr->sadb_msg_type = SADB_GET;
1610         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1611         out_hdr->sadb_msg_errno = 0;
1612         out_hdr->sadb_msg_reserved = 0;
1613         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1614         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1615         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1616
1617         return 0;
1618 }
1619
1620 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1621                                               gfp_t allocation)
1622 {
1623         struct sk_buff *skb;
1624         struct sadb_msg *hdr;
1625         int len, auth_len, enc_len, i;
1626
1627         auth_len = xfrm_count_pfkey_auth_supported();
1628         if (auth_len) {
1629                 auth_len *= sizeof(struct sadb_alg);
1630                 auth_len += sizeof(struct sadb_supported);
1631         }
1632
1633         enc_len = xfrm_count_pfkey_enc_supported();
1634         if (enc_len) {
1635                 enc_len *= sizeof(struct sadb_alg);
1636                 enc_len += sizeof(struct sadb_supported);
1637         }
1638
1639         len = enc_len + auth_len + sizeof(struct sadb_msg);
1640
1641         skb = alloc_skb(len + 16, allocation);
1642         if (!skb)
1643                 goto out_put_algs;
1644
1645         hdr = skb_put(skb, sizeof(*hdr));
1646         pfkey_hdr_dup(hdr, orig);
1647         hdr->sadb_msg_errno = 0;
1648         hdr->sadb_msg_len = len / sizeof(uint64_t);
1649
1650         if (auth_len) {
1651                 struct sadb_supported *sp;
1652                 struct sadb_alg *ap;
1653
1654                 sp = skb_put(skb, auth_len);
1655                 ap = (struct sadb_alg *) (sp + 1);
1656
1657                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1658                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1659
1660                 for (i = 0; ; i++) {
1661                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1662                         if (!aalg)
1663                                 break;
1664                         if (!aalg->pfkey_supported)
1665                                 continue;
1666                         if (aalg->available)
1667                                 *ap++ = aalg->desc;
1668                 }
1669         }
1670
1671         if (enc_len) {
1672                 struct sadb_supported *sp;
1673                 struct sadb_alg *ap;
1674
1675                 sp = skb_put(skb, enc_len);
1676                 ap = (struct sadb_alg *) (sp + 1);
1677
1678                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1679                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1680
1681                 for (i = 0; ; i++) {
1682                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1683                         if (!ealg)
1684                                 break;
1685                         if (!ealg->pfkey_supported)
1686                                 continue;
1687                         if (ealg->available)
1688                                 *ap++ = ealg->desc;
1689                 }
1690         }
1691
1692 out_put_algs:
1693         return skb;
1694 }
1695
1696 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1697 {
1698         struct pfkey_sock *pfk = pfkey_sk(sk);
1699         struct sk_buff *supp_skb;
1700
1701         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1702                 return -EINVAL;
1703
1704         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1705                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1706                         return -EEXIST;
1707                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1708         }
1709
1710         mutex_lock(&pfkey_mutex);
1711         xfrm_probe_algs();
1712
1713         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1714         mutex_unlock(&pfkey_mutex);
1715
1716         if (!supp_skb) {
1717                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1718                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1719
1720                 return -ENOBUFS;
1721         }
1722
1723         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1724                         sock_net(sk));
1725         return 0;
1726 }
1727
1728 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1729 {
1730         struct sk_buff *skb;
1731         struct sadb_msg *hdr;
1732
1733         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1734         if (!skb)
1735                 return -ENOBUFS;
1736
1737         hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg));
1738         hdr->sadb_msg_errno = (uint8_t) 0;
1739         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1740
1741         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1742                                sock_net(sk));
1743 }
1744
1745 static int key_notify_sa_flush(const struct km_event *c)
1746 {
1747         struct sk_buff *skb;
1748         struct sadb_msg *hdr;
1749
1750         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1751         if (!skb)
1752                 return -ENOBUFS;
1753         hdr = skb_put(skb, sizeof(struct sadb_msg));
1754         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1755         hdr->sadb_msg_type = SADB_FLUSH;
1756         hdr->sadb_msg_seq = c->seq;
1757         hdr->sadb_msg_pid = c->portid;
1758         hdr->sadb_msg_version = PF_KEY_V2;
1759         hdr->sadb_msg_errno = (uint8_t) 0;
1760         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1761         hdr->sadb_msg_reserved = 0;
1762
1763         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1764
1765         return 0;
1766 }
1767
1768 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1769 {
1770         struct net *net = sock_net(sk);
1771         unsigned int proto;
1772         struct km_event c;
1773         int err, err2;
1774
1775         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1776         if (proto == 0)
1777                 return -EINVAL;
1778
1779         err = xfrm_state_flush(net, proto, true);
1780         err2 = unicast_flush_resp(sk, hdr);
1781         if (err || err2) {
1782                 if (err == -ESRCH) /* empty table - go quietly */
1783                         err = 0;
1784                 return err ? err : err2;
1785         }
1786
1787         c.data.proto = proto;
1788         c.seq = hdr->sadb_msg_seq;
1789         c.portid = hdr->sadb_msg_pid;
1790         c.event = XFRM_MSG_FLUSHSA;
1791         c.net = net;
1792         km_state_notify(NULL, &c);
1793
1794         return 0;
1795 }
1796
1797 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1798 {
1799         struct pfkey_sock *pfk = ptr;
1800         struct sk_buff *out_skb;
1801         struct sadb_msg *out_hdr;
1802
1803         if (!pfkey_can_dump(&pfk->sk))
1804                 return -ENOBUFS;
1805
1806         out_skb = pfkey_xfrm_state2msg(x);
1807         if (IS_ERR(out_skb))
1808                 return PTR_ERR(out_skb);
1809
1810         out_hdr = (struct sadb_msg *) out_skb->data;
1811         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1812         out_hdr->sadb_msg_type = SADB_DUMP;
1813         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1814         out_hdr->sadb_msg_errno = 0;
1815         out_hdr->sadb_msg_reserved = 0;
1816         out_hdr->sadb_msg_seq = count + 1;
1817         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1818
1819         if (pfk->dump.skb)
1820                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1821                                 &pfk->sk, sock_net(&pfk->sk));
1822         pfk->dump.skb = out_skb;
1823
1824         return 0;
1825 }
1826
1827 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1828 {
1829         struct net *net = sock_net(&pfk->sk);
1830         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1831 }
1832
1833 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1834 {
1835         struct net *net = sock_net(&pfk->sk);
1836
1837         xfrm_state_walk_done(&pfk->dump.u.state, net);
1838 }
1839
1840 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1841 {
1842         u8 proto;
1843         struct xfrm_address_filter *filter = NULL;
1844         struct pfkey_sock *pfk = pfkey_sk(sk);
1845
1846         mutex_lock(&pfk->dump_lock);
1847         if (pfk->dump.dump != NULL) {
1848                 mutex_unlock(&pfk->dump_lock);
1849                 return -EBUSY;
1850         }
1851
1852         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1853         if (proto == 0) {
1854                 mutex_unlock(&pfk->dump_lock);
1855                 return -EINVAL;
1856         }
1857
1858         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1859                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1860
1861                 if ((xfilter->sadb_x_filter_splen >=
1862                         (sizeof(xfrm_address_t) << 3)) ||
1863                     (xfilter->sadb_x_filter_dplen >=
1864                         (sizeof(xfrm_address_t) << 3))) {
1865                         mutex_unlock(&pfk->dump_lock);
1866                         return -EINVAL;
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         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1965                 return -EINVAL;
1966
1967         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1968         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1969                 return -EINVAL;
1970         t->mode = mode;
1971         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1972                 t->optional = 1;
1973         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1974                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1975                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1976                         t->reqid = 0;
1977                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1978                         return -ENOBUFS;
1979         }
1980
1981         /* addresses present only in tunnel mode */
1982         if (t->mode == XFRM_MODE_TUNNEL) {
1983                 int err;
1984
1985                 err = parse_sockaddr_pair(
1986                         (struct sockaddr *)(rq + 1),
1987                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1988                         &t->saddr, &t->id.daddr, &t->encap_family);
1989                 if (err)
1990                         return err;
1991         } else
1992                 t->encap_family = xp->family;
1993
1994         /* No way to set this via kame pfkey */
1995         t->allalgs = 1;
1996         xp->xfrm_nr++;
1997         return 0;
1998 }
1999
2000 static int
2001 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2002 {
2003         int err;
2004         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2005         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2006
2007         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2008                 return -EINVAL;
2009
2010         while (len >= sizeof(*rq)) {
2011                 if (len < rq->sadb_x_ipsecrequest_len ||
2012                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2013                         return -EINVAL;
2014
2015                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2016                         return err;
2017                 len -= rq->sadb_x_ipsecrequest_len;
2018                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2019         }
2020         return 0;
2021 }
2022
2023 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2024 {
2025   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2026
2027         if (xfrm_ctx) {
2028                 int len = sizeof(struct sadb_x_sec_ctx);
2029                 len += xfrm_ctx->ctx_len;
2030                 return PFKEY_ALIGN8(len);
2031         }
2032         return 0;
2033 }
2034
2035 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2036 {
2037         const struct xfrm_tmpl *t;
2038         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2039         int socklen = 0;
2040         int i;
2041
2042         for (i=0; i<xp->xfrm_nr; i++) {
2043                 t = xp->xfrm_vec + i;
2044                 socklen += pfkey_sockaddr_len(t->encap_family);
2045         }
2046
2047         return sizeof(struct sadb_msg) +
2048                 (sizeof(struct sadb_lifetime) * 3) +
2049                 (sizeof(struct sadb_address) * 2) +
2050                 (sockaddr_size * 2) +
2051                 sizeof(struct sadb_x_policy) +
2052                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2053                 (socklen * 2) +
2054                 pfkey_xfrm_policy2sec_ctx_size(xp);
2055 }
2056
2057 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2058 {
2059         struct sk_buff *skb;
2060         int size;
2061
2062         size = pfkey_xfrm_policy2msg_size(xp);
2063
2064         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2065         if (skb == NULL)
2066                 return ERR_PTR(-ENOBUFS);
2067
2068         return skb;
2069 }
2070
2071 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2072 {
2073         struct sadb_msg *hdr;
2074         struct sadb_address *addr;
2075         struct sadb_lifetime *lifetime;
2076         struct sadb_x_policy *pol;
2077         struct sadb_x_sec_ctx *sec_ctx;
2078         struct xfrm_sec_ctx *xfrm_ctx;
2079         int i;
2080         int size;
2081         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2082         int socklen = pfkey_sockaddr_len(xp->family);
2083
2084         size = pfkey_xfrm_policy2msg_size(xp);
2085
2086         /* call should fill header later */
2087         hdr = skb_put(skb, sizeof(struct sadb_msg));
2088         memset(hdr, 0, size);   /* XXX do we need this ? */
2089
2090         /* src address */
2091         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2092         addr->sadb_address_len =
2093                 (sizeof(struct sadb_address)+sockaddr_size)/
2094                         sizeof(uint64_t);
2095         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2096         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2097         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2098         addr->sadb_address_reserved = 0;
2099         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2100                                  xp->selector.sport,
2101                                  (struct sockaddr *) (addr + 1),
2102                                  xp->family))
2103                 BUG();
2104
2105         /* dst address */
2106         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
2107         addr->sadb_address_len =
2108                 (sizeof(struct sadb_address)+sockaddr_size)/
2109                         sizeof(uint64_t);
2110         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2111         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2112         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2113         addr->sadb_address_reserved = 0;
2114
2115         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2116                             (struct sockaddr *) (addr + 1),
2117                             xp->family);
2118
2119         /* hard time */
2120         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2121         lifetime->sadb_lifetime_len =
2122                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2123         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2124         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2125         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2126         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2127         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2128         /* soft time */
2129         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2130         lifetime->sadb_lifetime_len =
2131                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2132         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2133         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2134         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2135         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2136         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2137         /* current time */
2138         lifetime = skb_put(skb, sizeof(struct sadb_lifetime));
2139         lifetime->sadb_lifetime_len =
2140                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2141         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2142         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2143         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2144         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2145         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2146
2147         pol = skb_put(skb, sizeof(struct sadb_x_policy));
2148         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2149         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2150         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2151         if (xp->action == XFRM_POLICY_ALLOW) {
2152                 if (xp->xfrm_nr)
2153                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2154                 else
2155                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2156         }
2157         pol->sadb_x_policy_dir = dir+1;
2158         pol->sadb_x_policy_reserved = 0;
2159         pol->sadb_x_policy_id = xp->index;
2160         pol->sadb_x_policy_priority = xp->priority;
2161
2162         for (i=0; i<xp->xfrm_nr; i++) {
2163                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2164                 struct sadb_x_ipsecrequest *rq;
2165                 int req_size;
2166                 int mode;
2167
2168                 req_size = sizeof(struct sadb_x_ipsecrequest);
2169                 if (t->mode == XFRM_MODE_TUNNEL) {
2170                         socklen = pfkey_sockaddr_len(t->encap_family);
2171                         req_size += socklen * 2;
2172                 } else {
2173                         size -= 2*socklen;
2174                 }
2175                 rq = skb_put(skb, req_size);
2176                 pol->sadb_x_policy_len += req_size/8;
2177                 memset(rq, 0, sizeof(*rq));
2178                 rq->sadb_x_ipsecrequest_len = req_size;
2179                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2180                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2181                         return -EINVAL;
2182                 rq->sadb_x_ipsecrequest_mode = mode;
2183                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2184                 if (t->reqid)
2185                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2186                 if (t->optional)
2187                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2188                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2189
2190                 if (t->mode == XFRM_MODE_TUNNEL) {
2191                         u8 *sa = (void *)(rq + 1);
2192                         pfkey_sockaddr_fill(&t->saddr, 0,
2193                                             (struct sockaddr *)sa,
2194                                             t->encap_family);
2195                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2196                                             (struct sockaddr *) (sa + socklen),
2197                                             t->encap_family);
2198                 }
2199         }
2200
2201         /* security context */
2202         if ((xfrm_ctx = xp->security)) {
2203                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2204
2205                 sec_ctx = skb_put(skb, ctx_size);
2206                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2207                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2208                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2209                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2210                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2211                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2212                        xfrm_ctx->ctx_len);
2213         }
2214
2215         hdr->sadb_msg_len = size / sizeof(uint64_t);
2216         hdr->sadb_msg_reserved = refcount_read(&xp->refcnt);
2217
2218         return 0;
2219 }
2220
2221 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2222 {
2223         struct sk_buff *out_skb;
2224         struct sadb_msg *out_hdr;
2225         int err;
2226
2227         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2228         if (IS_ERR(out_skb))
2229                 return PTR_ERR(out_skb);
2230
2231         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2232         if (err < 0)
2233                 return err;
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                 kfree_skb(out_skb);
2455                 goto out;
2456         }
2457
2458         out_hdr = (struct sadb_msg *) out_skb->data;
2459         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2460         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2461         out_hdr->sadb_msg_satype = 0;
2462         out_hdr->sadb_msg_errno = 0;
2463         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2464         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2465         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2466         err = 0;
2467
2468 out:
2469         return err;
2470 }
2471
2472 static int pfkey_sockaddr_pair_size(sa_family_t family)
2473 {
2474         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2475 }
2476
2477 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2478                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2479                                u16 *family)
2480 {
2481         int af, socklen;
2482
2483         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2484                 return -EINVAL;
2485
2486         af = pfkey_sockaddr_extract(sa, saddr);
2487         if (!af)
2488                 return -EINVAL;
2489
2490         socklen = pfkey_sockaddr_len(af);
2491         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2492                                    daddr) != af)
2493                 return -EINVAL;
2494
2495         *family = af;
2496         return 0;
2497 }
2498
2499 #ifdef CONFIG_NET_KEY_MIGRATE
2500 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2501                                     struct xfrm_migrate *m)
2502 {
2503         int err;
2504         struct sadb_x_ipsecrequest *rq2;
2505         int mode;
2506
2507         if (len < sizeof(*rq1) ||
2508             len < rq1->sadb_x_ipsecrequest_len ||
2509             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2510                 return -EINVAL;
2511
2512         /* old endoints */
2513         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2514                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2515                                   &m->old_saddr, &m->old_daddr,
2516                                   &m->old_family);
2517         if (err)
2518                 return err;
2519
2520         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2521         len -= rq1->sadb_x_ipsecrequest_len;
2522
2523         if (len <= sizeof(*rq2) ||
2524             len < rq2->sadb_x_ipsecrequest_len ||
2525             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2526                 return -EINVAL;
2527
2528         /* new endpoints */
2529         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2530                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2531                                   &m->new_saddr, &m->new_daddr,
2532                                   &m->new_family);
2533         if (err)
2534                 return err;
2535
2536         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2537             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2538             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2539                 return -EINVAL;
2540
2541         m->proto = rq1->sadb_x_ipsecrequest_proto;
2542         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2543                 return -EINVAL;
2544         m->mode = mode;
2545         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2546
2547         return ((int)(rq1->sadb_x_ipsecrequest_len +
2548                       rq2->sadb_x_ipsecrequest_len));
2549 }
2550
2551 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2552                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2553 {
2554         int i, len, ret, err = -EINVAL;
2555         u8 dir;
2556         struct sadb_address *sa;
2557         struct sadb_x_kmaddress *kma;
2558         struct sadb_x_policy *pol;
2559         struct sadb_x_ipsecrequest *rq;
2560         struct xfrm_selector sel;
2561         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2562         struct xfrm_kmaddress k;
2563         struct net *net = sock_net(sk);
2564
2565         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2566                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2567             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2568                 err = -EINVAL;
2569                 goto out;
2570         }
2571
2572         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2573         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2574
2575         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2576                 err = -EINVAL;
2577                 goto out;
2578         }
2579
2580         if (kma) {
2581                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2582                 k.reserved = kma->sadb_x_kmaddress_reserved;
2583                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2584                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2585                                           &k.local, &k.remote, &k.family);
2586                 if (ret < 0) {
2587                         err = ret;
2588                         goto out;
2589                 }
2590         }
2591
2592         dir = pol->sadb_x_policy_dir - 1;
2593         memset(&sel, 0, sizeof(sel));
2594
2595         /* set source address info of selector */
2596         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2597         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2598         sel.prefixlen_s = sa->sadb_address_prefixlen;
2599         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2600         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2601         if (sel.sport)
2602                 sel.sport_mask = htons(0xffff);
2603
2604         /* set destination address info of selector */
2605         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2606         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2607         sel.prefixlen_d = sa->sadb_address_prefixlen;
2608         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2609         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2610         if (sel.dport)
2611                 sel.dport_mask = htons(0xffff);
2612
2613         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2614
2615         /* extract ipsecrequests */
2616         i = 0;
2617         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2618
2619         while (len > 0 && i < XFRM_MAX_DEPTH) {
2620                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2621                 if (ret < 0) {
2622                         err = ret;
2623                         goto out;
2624                 } else {
2625                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2626                         len -= ret;
2627                         i++;
2628                 }
2629         }
2630
2631         if (!i || len > 0) {
2632                 err = -EINVAL;
2633                 goto out;
2634         }
2635
2636         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2637                             kma ? &k : NULL, net, NULL);
2638
2639  out:
2640         return err;
2641 }
2642 #else
2643 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2644                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2645 {
2646         return -ENOPROTOOPT;
2647 }
2648 #endif
2649
2650
2651 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2652 {
2653         struct net *net = sock_net(sk);
2654         unsigned int dir;
2655         int err = 0, delete;
2656         struct sadb_x_policy *pol;
2657         struct xfrm_policy *xp;
2658         struct km_event c;
2659
2660         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2661                 return -EINVAL;
2662
2663         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2664         if (dir >= XFRM_POLICY_MAX)
2665                 return -EINVAL;
2666
2667         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2668         xp = xfrm_policy_byid(net, &dummy_mark, XFRM_POLICY_TYPE_MAIN,
2669                               dir, pol->sadb_x_policy_id, delete, &err);
2670         if (xp == NULL)
2671                 return -ENOENT;
2672
2673         if (delete) {
2674                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2675
2676                 if (err)
2677                         goto out;
2678                 c.seq = hdr->sadb_msg_seq;
2679                 c.portid = hdr->sadb_msg_pid;
2680                 c.data.byid = 1;
2681                 c.event = XFRM_MSG_DELPOLICY;
2682                 km_policy_notify(xp, dir, &c);
2683         } else {
2684                 err = key_pol_get_resp(sk, xp, hdr, dir);
2685         }
2686
2687 out:
2688         xfrm_pol_put(xp);
2689         return err;
2690 }
2691
2692 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2693 {
2694         struct pfkey_sock *pfk = ptr;
2695         struct sk_buff *out_skb;
2696         struct sadb_msg *out_hdr;
2697         int err;
2698
2699         if (!pfkey_can_dump(&pfk->sk))
2700                 return -ENOBUFS;
2701
2702         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2703         if (IS_ERR(out_skb))
2704                 return PTR_ERR(out_skb);
2705
2706         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2707         if (err < 0) {
2708                 kfree_skb(out_skb);
2709                 return err;
2710         }
2711
2712         out_hdr = (struct sadb_msg *) out_skb->data;
2713         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2714         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2715         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2716         out_hdr->sadb_msg_errno = 0;
2717         out_hdr->sadb_msg_seq = count + 1;
2718         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2719
2720         if (pfk->dump.skb)
2721                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2722                                 &pfk->sk, sock_net(&pfk->sk));
2723         pfk->dump.skb = out_skb;
2724
2725         return 0;
2726 }
2727
2728 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2729 {
2730         struct net *net = sock_net(&pfk->sk);
2731         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2732 }
2733
2734 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2735 {
2736         struct net *net = sock_net((struct sock *)pfk);
2737
2738         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2739 }
2740
2741 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2742 {
2743         struct pfkey_sock *pfk = pfkey_sk(sk);
2744
2745         mutex_lock(&pfk->dump_lock);
2746         if (pfk->dump.dump != NULL) {
2747                 mutex_unlock(&pfk->dump_lock);
2748                 return -EBUSY;
2749         }
2750
2751         pfk->dump.msg_version = hdr->sadb_msg_version;
2752         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2753         pfk->dump.dump = pfkey_dump_sp;
2754         pfk->dump.done = pfkey_dump_sp_done;
2755         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2756         mutex_unlock(&pfk->dump_lock);
2757
2758         return pfkey_do_dump(pfk);
2759 }
2760
2761 static int key_notify_policy_flush(const struct km_event *c)
2762 {
2763         struct sk_buff *skb_out;
2764         struct sadb_msg *hdr;
2765
2766         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2767         if (!skb_out)
2768                 return -ENOBUFS;
2769         hdr = skb_put(skb_out, sizeof(struct sadb_msg));
2770         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2771         hdr->sadb_msg_seq = c->seq;
2772         hdr->sadb_msg_pid = c->portid;
2773         hdr->sadb_msg_version = PF_KEY_V2;
2774         hdr->sadb_msg_errno = (uint8_t) 0;
2775         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2776         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2777         hdr->sadb_msg_reserved = 0;
2778         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2779         return 0;
2780
2781 }
2782
2783 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2784 {
2785         struct net *net = sock_net(sk);
2786         struct km_event c;
2787         int err, err2;
2788
2789         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2790         err2 = unicast_flush_resp(sk, hdr);
2791         if (err || err2) {
2792                 if (err == -ESRCH) /* empty table - old silent behavior */
2793                         return 0;
2794                 return err;
2795         }
2796
2797         c.data.type = XFRM_POLICY_TYPE_MAIN;
2798         c.event = XFRM_MSG_FLUSHPOLICY;
2799         c.portid = hdr->sadb_msg_pid;
2800         c.seq = hdr->sadb_msg_seq;
2801         c.net = net;
2802         km_policy_notify(NULL, 0, &c);
2803
2804         return 0;
2805 }
2806
2807 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2808                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2809 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2810         [SADB_RESERVED]         = pfkey_reserved,
2811         [SADB_GETSPI]           = pfkey_getspi,
2812         [SADB_UPDATE]           = pfkey_add,
2813         [SADB_ADD]              = pfkey_add,
2814         [SADB_DELETE]           = pfkey_delete,
2815         [SADB_GET]              = pfkey_get,
2816         [SADB_ACQUIRE]          = pfkey_acquire,
2817         [SADB_REGISTER]         = pfkey_register,
2818         [SADB_EXPIRE]           = NULL,
2819         [SADB_FLUSH]            = pfkey_flush,
2820         [SADB_DUMP]             = pfkey_dump,
2821         [SADB_X_PROMISC]        = pfkey_promisc,
2822         [SADB_X_PCHANGE]        = NULL,
2823         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2824         [SADB_X_SPDADD]         = pfkey_spdadd,
2825         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2826         [SADB_X_SPDGET]         = pfkey_spdget,
2827         [SADB_X_SPDACQUIRE]     = NULL,
2828         [SADB_X_SPDDUMP]        = pfkey_spddump,
2829         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2830         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2831         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2832         [SADB_X_MIGRATE]        = pfkey_migrate,
2833 };
2834
2835 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2836 {
2837         void *ext_hdrs[SADB_EXT_MAX];
2838         int err;
2839
2840         /* Non-zero return value of pfkey_broadcast() does not always signal
2841          * an error and even on an actual error we may still want to process
2842          * the message so rather ignore the return value.
2843          */
2844         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2845                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2846
2847         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2848         err = parse_exthdrs(skb, hdr, ext_hdrs);
2849         if (!err) {
2850                 err = -EOPNOTSUPP;
2851                 if (pfkey_funcs[hdr->sadb_msg_type])
2852                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2853         }
2854         return err;
2855 }
2856
2857 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2858 {
2859         struct sadb_msg *hdr = NULL;
2860
2861         if (skb->len < sizeof(*hdr)) {
2862                 *errp = -EMSGSIZE;
2863         } else {
2864                 hdr = (struct sadb_msg *) skb->data;
2865                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2866                     hdr->sadb_msg_reserved != 0 ||
2867                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2868                      hdr->sadb_msg_type > SADB_MAX)) {
2869                         hdr = NULL;
2870                         *errp = -EINVAL;
2871                 } else if (hdr->sadb_msg_len != (skb->len /
2872                                                  sizeof(uint64_t)) ||
2873                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2874                                                 sizeof(uint64_t))) {
2875                         hdr = NULL;
2876                         *errp = -EMSGSIZE;
2877                 } else {
2878                         *errp = 0;
2879                 }
2880         }
2881         return hdr;
2882 }
2883
2884 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2885                                 const struct xfrm_algo_desc *d)
2886 {
2887         unsigned int id = d->desc.sadb_alg_id;
2888
2889         if (id >= sizeof(t->aalgos) * 8)
2890                 return 0;
2891
2892         return (t->aalgos >> id) & 1;
2893 }
2894
2895 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2896                                 const struct xfrm_algo_desc *d)
2897 {
2898         unsigned int id = d->desc.sadb_alg_id;
2899
2900         if (id >= sizeof(t->ealgos) * 8)
2901                 return 0;
2902
2903         return (t->ealgos >> id) & 1;
2904 }
2905
2906 static int count_ah_combs(const struct xfrm_tmpl *t)
2907 {
2908         int i, sz = 0;
2909
2910         for (i = 0; ; i++) {
2911                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2912                 if (!aalg)
2913                         break;
2914                 if (!aalg->pfkey_supported)
2915                         continue;
2916                 if (aalg_tmpl_set(t, aalg))
2917                         sz += sizeof(struct sadb_comb);
2918         }
2919         return sz + sizeof(struct sadb_prop);
2920 }
2921
2922 static int count_esp_combs(const struct xfrm_tmpl *t)
2923 {
2924         int i, k, sz = 0;
2925
2926         for (i = 0; ; i++) {
2927                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2928                 if (!ealg)
2929                         break;
2930
2931                 if (!ealg->pfkey_supported)
2932                         continue;
2933
2934                 if (!(ealg_tmpl_set(t, ealg)))
2935                         continue;
2936
2937                 for (k = 1; ; k++) {
2938                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2939                         if (!aalg)
2940                                 break;
2941
2942                         if (!aalg->pfkey_supported)
2943                                 continue;
2944
2945                         if (aalg_tmpl_set(t, aalg))
2946                                 sz += sizeof(struct sadb_comb);
2947                 }
2948         }
2949         return sz + sizeof(struct sadb_prop);
2950 }
2951
2952 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2953 {
2954         struct sadb_prop *p;
2955         int sz = 0;
2956         int i;
2957
2958         p = skb_put(skb, sizeof(struct sadb_prop));
2959         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2960         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2961         p->sadb_prop_replay = 32;
2962         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2963
2964         for (i = 0; ; i++) {
2965                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2966                 if (!aalg)
2967                         break;
2968
2969                 if (!aalg->pfkey_supported)
2970                         continue;
2971
2972                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2973                         struct sadb_comb *c;
2974                         c = skb_put_zero(skb, sizeof(struct sadb_comb));
2975                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2976                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2977                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2978                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2979                         c->sadb_comb_hard_addtime = 24*60*60;
2980                         c->sadb_comb_soft_addtime = 20*60*60;
2981                         c->sadb_comb_hard_usetime = 8*60*60;
2982                         c->sadb_comb_soft_usetime = 7*60*60;
2983                         sz += sizeof(*c);
2984                 }
2985         }
2986
2987         return sz + sizeof(*p);
2988 }
2989
2990 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2991 {
2992         struct sadb_prop *p;
2993         int sz = 0;
2994         int i, k;
2995
2996         p = skb_put(skb, sizeof(struct sadb_prop));
2997         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2998         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2999         p->sadb_prop_replay = 32;
3000         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3001
3002         for (i=0; ; i++) {
3003                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3004                 if (!ealg)
3005                         break;
3006
3007                 if (!ealg->pfkey_supported)
3008                         continue;
3009
3010                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3011                         continue;
3012
3013                 for (k = 1; ; k++) {
3014                         struct sadb_comb *c;
3015                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3016                         if (!aalg)
3017                                 break;
3018                         if (!aalg->pfkey_supported)
3019                                 continue;
3020                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3021                                 continue;
3022                         c = skb_put(skb, sizeof(struct sadb_comb));
3023                         memset(c, 0, sizeof(*c));
3024                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3025                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3026                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3027                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3028                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3029                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3030                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3031                         c->sadb_comb_hard_addtime = 24*60*60;
3032                         c->sadb_comb_soft_addtime = 20*60*60;
3033                         c->sadb_comb_hard_usetime = 8*60*60;
3034                         c->sadb_comb_soft_usetime = 7*60*60;
3035                         sz += sizeof(*c);
3036                 }
3037         }
3038
3039         return sz + sizeof(*p);
3040 }
3041
3042 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3043 {
3044         return 0;
3045 }
3046
3047 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3048 {
3049         struct sk_buff *out_skb;
3050         struct sadb_msg *out_hdr;
3051         int hard;
3052         int hsc;
3053
3054         hard = c->data.hard;
3055         if (hard)
3056                 hsc = 2;
3057         else
3058                 hsc = 1;
3059
3060         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3061         if (IS_ERR(out_skb))
3062                 return PTR_ERR(out_skb);
3063
3064         out_hdr = (struct sadb_msg *) out_skb->data;
3065         out_hdr->sadb_msg_version = PF_KEY_V2;
3066         out_hdr->sadb_msg_type = SADB_EXPIRE;
3067         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3068         out_hdr->sadb_msg_errno = 0;
3069         out_hdr->sadb_msg_reserved = 0;
3070         out_hdr->sadb_msg_seq = 0;
3071         out_hdr->sadb_msg_pid = 0;
3072
3073         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3074                         xs_net(x));
3075         return 0;
3076 }
3077
3078 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3079 {
3080         struct net *net = x ? xs_net(x) : c->net;
3081         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3082
3083         if (atomic_read(&net_pfkey->socks_nr) == 0)
3084                 return 0;
3085
3086         switch (c->event) {
3087         case XFRM_MSG_EXPIRE:
3088                 return key_notify_sa_expire(x, c);
3089         case XFRM_MSG_DELSA:
3090         case XFRM_MSG_NEWSA:
3091         case XFRM_MSG_UPDSA:
3092                 return key_notify_sa(x, c);
3093         case XFRM_MSG_FLUSHSA:
3094                 return key_notify_sa_flush(c);
3095         case XFRM_MSG_NEWAE: /* not yet supported */
3096                 break;
3097         default:
3098                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3099                 break;
3100         }
3101
3102         return 0;
3103 }
3104
3105 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3106 {
3107         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3108                 return 0;
3109
3110         switch (c->event) {
3111         case XFRM_MSG_POLEXPIRE:
3112                 return key_notify_policy_expire(xp, c);
3113         case XFRM_MSG_DELPOLICY:
3114         case XFRM_MSG_NEWPOLICY:
3115         case XFRM_MSG_UPDPOLICY:
3116                 return key_notify_policy(xp, dir, c);
3117         case XFRM_MSG_FLUSHPOLICY:
3118                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3119                         break;
3120                 return key_notify_policy_flush(c);
3121         default:
3122                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3123                 break;
3124         }
3125
3126         return 0;
3127 }
3128
3129 static u32 get_acqseq(void)
3130 {
3131         u32 res;
3132         static atomic_t acqseq;
3133
3134         do {
3135                 res = atomic_inc_return(&acqseq);
3136         } while (!res);
3137         return res;
3138 }
3139
3140 static bool pfkey_is_alive(const struct km_event *c)
3141 {
3142         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3143         struct sock *sk;
3144         bool is_alive = false;
3145
3146         rcu_read_lock();
3147         sk_for_each_rcu(sk, &net_pfkey->table) {
3148                 if (pfkey_sk(sk)->registered) {
3149                         is_alive = true;
3150                         break;
3151                 }
3152         }
3153         rcu_read_unlock();
3154
3155         return is_alive;
3156 }
3157
3158 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3159 {
3160         struct sk_buff *skb;
3161         struct sadb_msg *hdr;
3162         struct sadb_address *addr;
3163         struct sadb_x_policy *pol;
3164         int sockaddr_size;
3165         int size;
3166         struct sadb_x_sec_ctx *sec_ctx;
3167         struct xfrm_sec_ctx *xfrm_ctx;
3168         int ctx_size = 0;
3169         int alg_size = 0;
3170
3171         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3172         if (!sockaddr_size)
3173                 return -EINVAL;
3174
3175         size = sizeof(struct sadb_msg) +
3176                 (sizeof(struct sadb_address) * 2) +
3177                 (sockaddr_size * 2) +
3178                 sizeof(struct sadb_x_policy);
3179
3180         if (x->id.proto == IPPROTO_AH)
3181                 alg_size = count_ah_combs(t);
3182         else if (x->id.proto == IPPROTO_ESP)
3183                 alg_size = count_esp_combs(t);
3184
3185         if ((xfrm_ctx = x->security)) {
3186                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3187                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3188         }
3189
3190         skb =  alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3191         if (skb == NULL)
3192                 return -ENOMEM;
3193
3194         hdr = skb_put(skb, sizeof(struct sadb_msg));
3195         hdr->sadb_msg_version = PF_KEY_V2;
3196         hdr->sadb_msg_type = SADB_ACQUIRE;
3197         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3198         hdr->sadb_msg_len = size / sizeof(uint64_t);
3199         hdr->sadb_msg_errno = 0;
3200         hdr->sadb_msg_reserved = 0;
3201         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3202         hdr->sadb_msg_pid = 0;
3203
3204         /* src address */
3205         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3206         addr->sadb_address_len =
3207                 (sizeof(struct sadb_address)+sockaddr_size)/
3208                         sizeof(uint64_t);
3209         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3210         addr->sadb_address_proto = 0;
3211         addr->sadb_address_reserved = 0;
3212         addr->sadb_address_prefixlen =
3213                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3214                                     (struct sockaddr *) (addr + 1),
3215                                     x->props.family);
3216         if (!addr->sadb_address_prefixlen)
3217                 BUG();
3218
3219         /* dst address */
3220         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3221         addr->sadb_address_len =
3222                 (sizeof(struct sadb_address)+sockaddr_size)/
3223                         sizeof(uint64_t);
3224         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3225         addr->sadb_address_proto = 0;
3226         addr->sadb_address_reserved = 0;
3227         addr->sadb_address_prefixlen =
3228                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3229                                     (struct sockaddr *) (addr + 1),
3230                                     x->props.family);
3231         if (!addr->sadb_address_prefixlen)
3232                 BUG();
3233
3234         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3235         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3236         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3237         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3238         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3239         pol->sadb_x_policy_reserved = 0;
3240         pol->sadb_x_policy_id = xp->index;
3241         pol->sadb_x_policy_priority = xp->priority;
3242
3243         /* Set sadb_comb's. */
3244         alg_size = 0;
3245         if (x->id.proto == IPPROTO_AH)
3246                 alg_size = dump_ah_combs(skb, t);
3247         else if (x->id.proto == IPPROTO_ESP)
3248                 alg_size = dump_esp_combs(skb, t);
3249
3250         hdr->sadb_msg_len += alg_size / 8;
3251
3252         /* security context */
3253         if (xfrm_ctx) {
3254                 sec_ctx = skb_put(skb,
3255                                   sizeof(struct sadb_x_sec_ctx) + ctx_size);
3256                 sec_ctx->sadb_x_sec_len =
3257                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3258                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3259                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3260                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3261                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3262                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3263                        xfrm_ctx->ctx_len);
3264         }
3265
3266         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3267                                xs_net(x));
3268 }
3269
3270 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3271                                                 u8 *data, int len, int *dir)
3272 {
3273         struct net *net = sock_net(sk);
3274         struct xfrm_policy *xp;
3275         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3276         struct sadb_x_sec_ctx *sec_ctx;
3277
3278         switch (sk->sk_family) {
3279         case AF_INET:
3280                 if (opt != IP_IPSEC_POLICY) {
3281                         *dir = -EOPNOTSUPP;
3282                         return NULL;
3283                 }
3284                 break;
3285 #if IS_ENABLED(CONFIG_IPV6)
3286         case AF_INET6:
3287                 if (opt != IPV6_IPSEC_POLICY) {
3288                         *dir = -EOPNOTSUPP;
3289                         return NULL;
3290                 }
3291                 break;
3292 #endif
3293         default:
3294                 *dir = -EINVAL;
3295                 return NULL;
3296         }
3297
3298         *dir = -EINVAL;
3299
3300         if (len < sizeof(struct sadb_x_policy) ||
3301             pol->sadb_x_policy_len*8 > len ||
3302             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3303             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3304                 return NULL;
3305
3306         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3307         if (xp == NULL) {
3308                 *dir = -ENOBUFS;
3309                 return NULL;
3310         }
3311
3312         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3313                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3314
3315         xp->lft.soft_byte_limit = XFRM_INF;
3316         xp->lft.hard_byte_limit = XFRM_INF;
3317         xp->lft.soft_packet_limit = XFRM_INF;
3318         xp->lft.hard_packet_limit = XFRM_INF;
3319         xp->family = sk->sk_family;
3320
3321         xp->xfrm_nr = 0;
3322         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3323             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3324                 goto out;
3325
3326         /* security context too */
3327         if (len >= (pol->sadb_x_policy_len*8 +
3328             sizeof(struct sadb_x_sec_ctx))) {
3329                 char *p = (char *)pol;
3330                 struct xfrm_user_sec_ctx *uctx;
3331
3332                 p += pol->sadb_x_policy_len*8;
3333                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3334                 if (len < pol->sadb_x_policy_len*8 +
3335                     sec_ctx->sadb_x_sec_len*8) {
3336                         *dir = -EINVAL;
3337                         goto out;
3338                 }
3339                 if ((*dir = verify_sec_ctx_len(p)))
3340                         goto out;
3341                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3342                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3343                 kfree(uctx);
3344
3345                 if (*dir)
3346                         goto out;
3347         }
3348
3349         *dir = pol->sadb_x_policy_dir-1;
3350         return xp;
3351
3352 out:
3353         xp->walk.dead = 1;
3354         xfrm_policy_destroy(xp);
3355         return NULL;
3356 }
3357
3358 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3359 {
3360         struct sk_buff *skb;
3361         struct sadb_msg *hdr;
3362         struct sadb_sa *sa;
3363         struct sadb_address *addr;
3364         struct sadb_x_nat_t_port *n_port;
3365         int sockaddr_size;
3366         int size;
3367         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3368         struct xfrm_encap_tmpl *natt = NULL;
3369
3370         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3371         if (!sockaddr_size)
3372                 return -EINVAL;
3373
3374         if (!satype)
3375                 return -EINVAL;
3376
3377         if (!x->encap)
3378                 return -EINVAL;
3379
3380         natt = x->encap;
3381
3382         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3383          *
3384          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3385          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3386          */
3387
3388         size = sizeof(struct sadb_msg) +
3389                 sizeof(struct sadb_sa) +
3390                 (sizeof(struct sadb_address) * 2) +
3391                 (sockaddr_size * 2) +
3392                 (sizeof(struct sadb_x_nat_t_port) * 2);
3393
3394         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3395         if (skb == NULL)
3396                 return -ENOMEM;
3397
3398         hdr = skb_put(skb, sizeof(struct sadb_msg));
3399         hdr->sadb_msg_version = PF_KEY_V2;
3400         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3401         hdr->sadb_msg_satype = satype;
3402         hdr->sadb_msg_len = size / sizeof(uint64_t);
3403         hdr->sadb_msg_errno = 0;
3404         hdr->sadb_msg_reserved = 0;
3405         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3406         hdr->sadb_msg_pid = 0;
3407
3408         /* SA */
3409         sa = skb_put(skb, sizeof(struct sadb_sa));
3410         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3411         sa->sadb_sa_exttype = SADB_EXT_SA;
3412         sa->sadb_sa_spi = x->id.spi;
3413         sa->sadb_sa_replay = 0;
3414         sa->sadb_sa_state = 0;
3415         sa->sadb_sa_auth = 0;
3416         sa->sadb_sa_encrypt = 0;
3417         sa->sadb_sa_flags = 0;
3418
3419         /* ADDRESS_SRC (old addr) */
3420         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3421         addr->sadb_address_len =
3422                 (sizeof(struct sadb_address)+sockaddr_size)/
3423                         sizeof(uint64_t);
3424         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3425         addr->sadb_address_proto = 0;
3426         addr->sadb_address_reserved = 0;
3427         addr->sadb_address_prefixlen =
3428                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3429                                     (struct sockaddr *) (addr + 1),
3430                                     x->props.family);
3431         if (!addr->sadb_address_prefixlen)
3432                 BUG();
3433
3434         /* NAT_T_SPORT (old port) */
3435         n_port = skb_put(skb, sizeof(*n_port));
3436         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3437         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3438         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3439         n_port->sadb_x_nat_t_port_reserved = 0;
3440
3441         /* ADDRESS_DST (new addr) */
3442         addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size);
3443         addr->sadb_address_len =
3444                 (sizeof(struct sadb_address)+sockaddr_size)/
3445                         sizeof(uint64_t);
3446         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3447         addr->sadb_address_proto = 0;
3448         addr->sadb_address_reserved = 0;
3449         addr->sadb_address_prefixlen =
3450                 pfkey_sockaddr_fill(ipaddr, 0,
3451                                     (struct sockaddr *) (addr + 1),
3452                                     x->props.family);
3453         if (!addr->sadb_address_prefixlen)
3454                 BUG();
3455
3456         /* NAT_T_DPORT (new port) */
3457         n_port = skb_put(skb, sizeof(*n_port));
3458         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3459         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3460         n_port->sadb_x_nat_t_port_port = sport;
3461         n_port->sadb_x_nat_t_port_reserved = 0;
3462
3463         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3464                                xs_net(x));
3465 }
3466
3467 #ifdef CONFIG_NET_KEY_MIGRATE
3468 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3469                             const struct xfrm_selector *sel)
3470 {
3471         struct sadb_address *addr;
3472         addr = skb_put(skb, sizeof(struct sadb_address) + sasize);
3473         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3474         addr->sadb_address_exttype = type;
3475         addr->sadb_address_proto = sel->proto;
3476         addr->sadb_address_reserved = 0;
3477
3478         switch (type) {
3479         case SADB_EXT_ADDRESS_SRC:
3480                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3481                 pfkey_sockaddr_fill(&sel->saddr, 0,
3482                                     (struct sockaddr *)(addr + 1),
3483                                     sel->family);
3484                 break;
3485         case SADB_EXT_ADDRESS_DST:
3486                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3487                 pfkey_sockaddr_fill(&sel->daddr, 0,
3488                                     (struct sockaddr *)(addr + 1),
3489                                     sel->family);
3490                 break;
3491         default:
3492                 return -EINVAL;
3493         }
3494
3495         return 0;
3496 }
3497
3498
3499 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3500 {
3501         struct sadb_x_kmaddress *kma;
3502         u8 *sa;
3503         int family = k->family;
3504         int socklen = pfkey_sockaddr_len(family);
3505         int size_req;
3506
3507         size_req = (sizeof(struct sadb_x_kmaddress) +
3508                     pfkey_sockaddr_pair_size(family));
3509
3510         kma = skb_put_zero(skb, size_req);
3511         kma->sadb_x_kmaddress_len = size_req / 8;
3512         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3513         kma->sadb_x_kmaddress_reserved = k->reserved;
3514
3515         sa = (u8 *)(kma + 1);
3516         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3517             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3518                 return -EINVAL;
3519
3520         return 0;
3521 }
3522
3523 static int set_ipsecrequest(struct sk_buff *skb,
3524                             uint8_t proto, uint8_t mode, int level,
3525                             uint32_t reqid, uint8_t family,
3526                             const xfrm_address_t *src, const xfrm_address_t *dst)
3527 {
3528         struct sadb_x_ipsecrequest *rq;
3529         u8 *sa;
3530         int socklen = pfkey_sockaddr_len(family);
3531         int size_req;
3532
3533         size_req = sizeof(struct sadb_x_ipsecrequest) +
3534                    pfkey_sockaddr_pair_size(family);
3535
3536         rq = skb_put_zero(skb, size_req);
3537         rq->sadb_x_ipsecrequest_len = size_req;
3538         rq->sadb_x_ipsecrequest_proto = proto;
3539         rq->sadb_x_ipsecrequest_mode = mode;
3540         rq->sadb_x_ipsecrequest_level = level;
3541         rq->sadb_x_ipsecrequest_reqid = reqid;
3542
3543         sa = (u8 *) (rq + 1);
3544         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3545             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3546                 return -EINVAL;
3547
3548         return 0;
3549 }
3550 #endif
3551
3552 #ifdef CONFIG_NET_KEY_MIGRATE
3553 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3554                               const struct xfrm_migrate *m, int num_bundles,
3555                               const struct xfrm_kmaddress *k,
3556                               const struct xfrm_encap_tmpl *encap)
3557 {
3558         int i;
3559         int sasize_sel;
3560         int size = 0;
3561         int size_pol = 0;
3562         struct sk_buff *skb;
3563         struct sadb_msg *hdr;
3564         struct sadb_x_policy *pol;
3565         const struct xfrm_migrate *mp;
3566
3567         if (type != XFRM_POLICY_TYPE_MAIN)
3568                 return 0;
3569
3570         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3571                 return -EINVAL;
3572
3573         if (k != NULL) {
3574                 /* addresses for KM */
3575                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3576                                      pfkey_sockaddr_pair_size(k->family));
3577         }
3578
3579         /* selector */
3580         sasize_sel = pfkey_sockaddr_size(sel->family);
3581         if (!sasize_sel)
3582                 return -EINVAL;
3583         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3584
3585         /* policy info */
3586         size_pol += sizeof(struct sadb_x_policy);
3587
3588         /* ipsecrequests */
3589         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3590                 /* old locator pair */
3591                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3592                             pfkey_sockaddr_pair_size(mp->old_family);
3593                 /* new locator pair */
3594                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3595                             pfkey_sockaddr_pair_size(mp->new_family);
3596         }
3597
3598         size += sizeof(struct sadb_msg) + size_pol;
3599
3600         /* alloc buffer */
3601         skb = alloc_skb(size, GFP_ATOMIC);
3602         if (skb == NULL)
3603                 return -ENOMEM;
3604
3605         hdr = skb_put(skb, sizeof(struct sadb_msg));
3606         hdr->sadb_msg_version = PF_KEY_V2;
3607         hdr->sadb_msg_type = SADB_X_MIGRATE;
3608         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3609         hdr->sadb_msg_len = size / 8;
3610         hdr->sadb_msg_errno = 0;
3611         hdr->sadb_msg_reserved = 0;
3612         hdr->sadb_msg_seq = 0;
3613         hdr->sadb_msg_pid = 0;
3614
3615         /* Addresses to be used by KM for negotiation, if ext is available */
3616         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3617                 goto err;
3618
3619         /* selector src */
3620         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3621
3622         /* selector dst */
3623         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3624
3625         /* policy information */
3626         pol = skb_put(skb, sizeof(struct sadb_x_policy));
3627         pol->sadb_x_policy_len = size_pol / 8;
3628         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3629         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3630         pol->sadb_x_policy_dir = dir + 1;
3631         pol->sadb_x_policy_reserved = 0;
3632         pol->sadb_x_policy_id = 0;
3633         pol->sadb_x_policy_priority = 0;
3634
3635         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3636                 /* old ipsecrequest */
3637                 int mode = pfkey_mode_from_xfrm(mp->mode);
3638                 if (mode < 0)
3639                         goto err;
3640                 if (set_ipsecrequest(skb, mp->proto, mode,
3641                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3642                                      mp->reqid, mp->old_family,
3643                                      &mp->old_saddr, &mp->old_daddr) < 0)
3644                         goto err;
3645
3646                 /* new ipsecrequest */
3647                 if (set_ipsecrequest(skb, mp->proto, mode,
3648                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3649                                      mp->reqid, mp->new_family,
3650                                      &mp->new_saddr, &mp->new_daddr) < 0)
3651                         goto err;
3652         }
3653
3654         /* broadcast migrate message to sockets */
3655         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3656
3657         return 0;
3658
3659 err:
3660         kfree_skb(skb);
3661         return -EINVAL;
3662 }
3663 #else
3664 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3665                               const struct xfrm_migrate *m, int num_bundles,
3666                               const struct xfrm_kmaddress *k,
3667                               const struct xfrm_encap_tmpl *encap)
3668 {
3669         return -ENOPROTOOPT;
3670 }
3671 #endif
3672
3673 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3674 {
3675         struct sock *sk = sock->sk;
3676         struct sk_buff *skb = NULL;
3677         struct sadb_msg *hdr = NULL;
3678         int err;
3679         struct net *net = sock_net(sk);
3680
3681         err = -EOPNOTSUPP;
3682         if (msg->msg_flags & MSG_OOB)
3683                 goto out;
3684
3685         err = -EMSGSIZE;
3686         if ((unsigned int)len > sk->sk_sndbuf - 32)
3687                 goto out;
3688
3689         err = -ENOBUFS;
3690         skb = alloc_skb(len, GFP_KERNEL);
3691         if (skb == NULL)
3692                 goto out;
3693
3694         err = -EFAULT;
3695         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3696                 goto out;
3697
3698         hdr = pfkey_get_base_msg(skb, &err);
3699         if (!hdr)
3700                 goto out;
3701
3702         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3703         err = pfkey_process(sk, skb, hdr);
3704         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3705
3706 out:
3707         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3708                 err = 0;
3709         kfree_skb(skb);
3710
3711         return err ? : len;
3712 }
3713
3714 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3715                          int flags)
3716 {
3717         struct sock *sk = sock->sk;
3718         struct pfkey_sock *pfk = pfkey_sk(sk);
3719         struct sk_buff *skb;
3720         int copied, err;
3721
3722         err = -EINVAL;
3723         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3724                 goto out;
3725
3726         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3727         if (skb == NULL)
3728                 goto out;
3729
3730         copied = skb->len;
3731         if (copied > len) {
3732                 msg->msg_flags |= MSG_TRUNC;
3733                 copied = len;
3734         }
3735
3736         skb_reset_transport_header(skb);
3737         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3738         if (err)
3739                 goto out_free;
3740
3741         sock_recv_ts_and_drops(msg, sk, skb);
3742
3743         err = (flags & MSG_TRUNC) ? skb->len : copied;
3744
3745         if (pfk->dump.dump != NULL &&
3746             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3747                 pfkey_do_dump(pfk);
3748
3749 out_free:
3750         skb_free_datagram(sk, skb);
3751 out:
3752         return err;
3753 }
3754
3755 static const struct proto_ops pfkey_ops = {
3756         .family         =       PF_KEY,
3757         .owner          =       THIS_MODULE,
3758         /* Operations that make no sense on pfkey sockets. */
3759         .bind           =       sock_no_bind,
3760         .connect        =       sock_no_connect,
3761         .socketpair     =       sock_no_socketpair,
3762         .accept         =       sock_no_accept,
3763         .getname        =       sock_no_getname,
3764         .ioctl          =       sock_no_ioctl,
3765         .listen         =       sock_no_listen,
3766         .shutdown       =       sock_no_shutdown,
3767         .setsockopt     =       sock_no_setsockopt,
3768         .getsockopt     =       sock_no_getsockopt,
3769         .mmap           =       sock_no_mmap,
3770         .sendpage       =       sock_no_sendpage,
3771
3772         /* Now the operations that really occur. */
3773         .release        =       pfkey_release,
3774         .poll           =       datagram_poll,
3775         .sendmsg        =       pfkey_sendmsg,
3776         .recvmsg        =       pfkey_recvmsg,
3777 };
3778
3779 static const struct net_proto_family pfkey_family_ops = {
3780         .family =       PF_KEY,
3781         .create =       pfkey_create,
3782         .owner  =       THIS_MODULE,
3783 };
3784
3785 #ifdef CONFIG_PROC_FS
3786 static int pfkey_seq_show(struct seq_file *f, void *v)
3787 {
3788         struct sock *s = sk_entry(v);
3789
3790         if (v == SEQ_START_TOKEN)
3791                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3792         else
3793                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3794                                s,
3795                                refcount_read(&s->sk_refcnt),
3796                                sk_rmem_alloc_get(s),
3797                                sk_wmem_alloc_get(s),
3798                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3799                                sock_i_ino(s)
3800                                );
3801         return 0;
3802 }
3803
3804 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3805         __acquires(rcu)
3806 {
3807         struct net *net = seq_file_net(f);
3808         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3809
3810         rcu_read_lock();
3811         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3812 }
3813
3814 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3815 {
3816         struct net *net = seq_file_net(f);
3817         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3818
3819         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3820 }
3821
3822 static void pfkey_seq_stop(struct seq_file *f, void *v)
3823         __releases(rcu)
3824 {
3825         rcu_read_unlock();
3826 }
3827
3828 static const struct seq_operations pfkey_seq_ops = {
3829         .start  = pfkey_seq_start,
3830         .next   = pfkey_seq_next,
3831         .stop   = pfkey_seq_stop,
3832         .show   = pfkey_seq_show,
3833 };
3834
3835 static int pfkey_seq_open(struct inode *inode, struct file *file)
3836 {
3837         return seq_open_net(inode, file, &pfkey_seq_ops,
3838                             sizeof(struct seq_net_private));
3839 }
3840
3841 static const struct file_operations pfkey_proc_ops = {
3842         .open    = pfkey_seq_open,
3843         .read    = seq_read,
3844         .llseek  = seq_lseek,
3845         .release = seq_release_net,
3846 };
3847
3848 static int __net_init pfkey_init_proc(struct net *net)
3849 {
3850         struct proc_dir_entry *e;
3851
3852         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3853         if (e == NULL)
3854                 return -ENOMEM;
3855
3856         return 0;
3857 }
3858
3859 static void __net_exit pfkey_exit_proc(struct net *net)
3860 {
3861         remove_proc_entry("pfkey", net->proc_net);
3862 }
3863 #else
3864 static inline int pfkey_init_proc(struct net *net)
3865 {
3866         return 0;
3867 }
3868
3869 static inline void pfkey_exit_proc(struct net *net)
3870 {
3871 }
3872 #endif
3873
3874 static struct xfrm_mgr pfkeyv2_mgr =
3875 {
3876         .notify         = pfkey_send_notify,
3877         .acquire        = pfkey_send_acquire,
3878         .compile_policy = pfkey_compile_policy,
3879         .new_mapping    = pfkey_send_new_mapping,
3880         .notify_policy  = pfkey_send_policy_notify,
3881         .migrate        = pfkey_send_migrate,
3882         .is_alive       = pfkey_is_alive,
3883 };
3884
3885 static int __net_init pfkey_net_init(struct net *net)
3886 {
3887         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3888         int rv;
3889
3890         INIT_HLIST_HEAD(&net_pfkey->table);
3891         atomic_set(&net_pfkey->socks_nr, 0);
3892
3893         rv = pfkey_init_proc(net);
3894
3895         return rv;
3896 }
3897
3898 static void __net_exit pfkey_net_exit(struct net *net)
3899 {
3900         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3901
3902         pfkey_exit_proc(net);
3903         BUG_ON(!hlist_empty(&net_pfkey->table));
3904 }
3905
3906 static struct pernet_operations pfkey_net_ops = {
3907         .init = pfkey_net_init,
3908         .exit = pfkey_net_exit,
3909         .id   = &pfkey_net_id,
3910         .size = sizeof(struct netns_pfkey),
3911 };
3912
3913 static void __exit ipsec_pfkey_exit(void)
3914 {
3915         xfrm_unregister_km(&pfkeyv2_mgr);
3916         sock_unregister(PF_KEY);
3917         unregister_pernet_subsys(&pfkey_net_ops);
3918         proto_unregister(&key_proto);
3919 }
3920
3921 static int __init ipsec_pfkey_init(void)
3922 {
3923         int err = proto_register(&key_proto, 0);
3924
3925         if (err != 0)
3926                 goto out;
3927
3928         err = register_pernet_subsys(&pfkey_net_ops);
3929         if (err != 0)
3930                 goto out_unregister_key_proto;
3931         err = sock_register(&pfkey_family_ops);
3932         if (err != 0)
3933                 goto out_unregister_pernet;
3934         err = xfrm_register_km(&pfkeyv2_mgr);
3935         if (err != 0)
3936                 goto out_sock_unregister;
3937 out:
3938         return err;
3939
3940 out_sock_unregister:
3941         sock_unregister(PF_KEY);
3942 out_unregister_pernet:
3943         unregister_pernet_subsys(&pfkey_net_ops);
3944 out_unregister_key_proto:
3945         proto_unregister(&key_proto);
3946         goto out;
3947 }
3948
3949 module_init(ipsec_pfkey_init);
3950 module_exit(ipsec_pfkey_exit);
3951 MODULE_LICENSE("GPL");
3952 MODULE_ALIAS_NETPROTO(PF_KEY);