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 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(atomic_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 = (struct sadb_msg *) 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 = (struct sadb_msg *) 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 = (struct sadb_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 = (struct sadb_lifetime *)  skb_put(skb,
 891                                                              sizeof(struct sadb_lifetime));
 892                 lifetime->sadb_lifetime_len =
 893                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 894                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 895                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 896                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 897                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 898                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 899         }
 900         /* soft time */
 901         if (hsc & 1) {
 902                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 903                                                              sizeof(struct sadb_lifetime));
 904                 lifetime->sadb_lifetime_len =
 905                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 906                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 907                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 908                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 909                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 910                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 911         }
 912         /* current time */
 913         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 914                                                      sizeof(struct sadb_lifetime));
 915         lifetime->sadb_lifetime_len =
 916                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 917         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 918         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 919         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 920         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 921         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 922         /* src address */
 923         addr = (struct sadb_address*) skb_put(skb,
 924                                               sizeof(struct sadb_address)+sockaddr_size);
 925         addr->sadb_address_len =
 926                 (sizeof(struct sadb_address)+sockaddr_size)/
 927                         sizeof(uint64_t);
 928         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 929         /* "if the ports are non-zero, then the sadb_address_proto field,
 930            normally zero, MUST be filled in with the transport
 931            protocol's number." - RFC2367 */
 932         addr->sadb_address_proto = 0;
 933         addr->sadb_address_reserved = 0;
 934
 935         addr->sadb_address_prefixlen =
 936                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 937                                     (struct sockaddr *) (addr + 1),
 938                                     x->props.family);
 939         if (!addr->sadb_address_prefixlen)
 940                 BUG();
 941
 942         /* dst address */
 943         addr = (struct sadb_address*) skb_put(skb,
 944                                               sizeof(struct sadb_address)+sockaddr_size);
 945         addr->sadb_address_len =
 946                 (sizeof(struct sadb_address)+sockaddr_size)/
 947                         sizeof(uint64_t);
 948         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 949         addr->sadb_address_proto = 0;
 950         addr->sadb_address_reserved = 0;
 951
 952         addr->sadb_address_prefixlen =
 953                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 954                                     (struct sockaddr *) (addr + 1),
 955                                     x->props.family);
 956         if (!addr->sadb_address_prefixlen)
 957                 BUG();
 958
 959         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 960                              x->props.family)) {
 961                 addr = (struct sadb_address*) skb_put(skb,
 962                         sizeof(struct sadb_address)+sockaddr_size);
 963                 addr->sadb_address_len =
 964                         (sizeof(struct sadb_address)+sockaddr_size)/
 965                         sizeof(uint64_t);
 966                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 967                 addr->sadb_address_proto =
 968                         pfkey_proto_from_xfrm(x->sel.proto);
 969                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 970                 addr->sadb_address_reserved = 0;
 971
 972                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 973                                     (struct sockaddr *) (addr + 1),
 974                                     x->props.family);
 975         }
 976
 977         /* auth key */
 978         if (add_keys && auth_key_size) {
 979                 key = (struct sadb_key *) skb_put(skb,
 980                                                   sizeof(struct sadb_key)+auth_key_size);
 981                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 982                         sizeof(uint64_t);
 983                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 984                 key->sadb_key_bits = x->aalg->alg_key_len;
 985                 key->sadb_key_reserved = 0;
 986                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 987         }
 988         /* encrypt key */
 989         if (add_keys && encrypt_key_size) {
 990                 key = (struct sadb_key *) skb_put(skb,
 991                                                   sizeof(struct sadb_key)+encrypt_key_size);
 992                 key->sadb_key_len = (sizeof(struct sadb_key) +
 993                                      encrypt_key_size) / sizeof(uint64_t);
 994                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 995                 key->sadb_key_bits = x->ealg->alg_key_len;
 996                 key->sadb_key_reserved = 0;
 997                 memcpy(key + 1, x->ealg->alg_key,
 998                        (x->ealg->alg_key_len+7)/8);
 999         }
1000
1001         /* sa */
1002         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
1003         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1004         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1005         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1006                 kfree_skb(skb);
1007                 return ERR_PTR(-EINVAL);
1008         }
1009         sa2->sadb_x_sa2_mode = mode;
1010         sa2->sadb_x_sa2_reserved1 = 0;
1011         sa2->sadb_x_sa2_reserved2 = 0;
1012         sa2->sadb_x_sa2_sequence = 0;
1013         sa2->sadb_x_sa2_reqid = x->props.reqid;
1014
1015         if (natt && natt->encap_type) {
1016                 struct sadb_x_nat_t_type *n_type;
1017                 struct sadb_x_nat_t_port *n_port;
1018
1019                 /* type */
1020                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1021                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1022                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1023                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1024                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1025                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1026                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1027
1028                 /* source port */
1029                 n_port = (struct sadb_x_nat_t_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_SPORT;
1032                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1033                 n_port->sadb_x_nat_t_port_reserved = 0;
1034
1035                 /* dest port */
1036                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1037                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1038                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1039                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1040                 n_port->sadb_x_nat_t_port_reserved = 0;
1041         }
1042
1043         /* security context */
1044         if (xfrm_ctx) {
1045                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1046                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1047                 sec_ctx->sadb_x_sec_len =
1048                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1049                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1050                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1051                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1052                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1053                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1054                        xfrm_ctx->ctx_len);
1055         }
1056
1057         return skb;
1058 }
1059
1060
1061 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1062 {
1063         struct sk_buff *skb;
1064
1065         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1066
1067         return skb;
1068 }
1069
1070 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1071                                                           int hsc)
1072 {
1073         return __pfkey_xfrm_state2msg(x, 0, hsc);
1074 }
1075
1076 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1077                                                 const struct sadb_msg *hdr,
1078                                                 void * const *ext_hdrs)
1079 {
1080         struct xfrm_state *x;
1081         const struct sadb_lifetime *lifetime;
1082         const struct sadb_sa *sa;
1083         const struct sadb_key *key;
1084         const struct sadb_x_sec_ctx *sec_ctx;
1085         uint16_t proto;
1086         int err;
1087
1088
1089         sa = ext_hdrs[SADB_EXT_SA - 1];
1090         if (!sa ||
1091             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1092                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1093                 return ERR_PTR(-EINVAL);
1094         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1095             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1096                 return ERR_PTR(-EINVAL);
1097         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1098             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1099                 return ERR_PTR(-EINVAL);
1100         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1101             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1102                 return ERR_PTR(-EINVAL);
1103
1104         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1105         if (proto == 0)
1106                 return ERR_PTR(-EINVAL);
1107
1108         /* default error is no buffer space */
1109         err = -ENOBUFS;
1110
1111         /* RFC2367:
1112
1113    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1114    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1115    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1116    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1117    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1118    not true.
1119
1120            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1121            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1122          */
1123         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1124             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1125              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1126             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1127                 return ERR_PTR(-EINVAL);
1128         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1129         if (key != NULL &&
1130             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1131             key->sadb_key_bits == 0)
1132                 return ERR_PTR(-EINVAL);
1133         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1134         if (key != NULL &&
1135             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1136             key->sadb_key_bits == 0)
1137                 return ERR_PTR(-EINVAL);
1138
1139         x = xfrm_state_alloc(net);
1140         if (x == NULL)
1141                 return ERR_PTR(-ENOBUFS);
1142
1143         x->id.proto = proto;
1144         x->id.spi = sa->sadb_sa_spi;
1145         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1146                                         (sizeof(x->replay.bitmap) * 8));
1147         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1148                 x->props.flags |= XFRM_STATE_NOECN;
1149         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1150                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1151         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1152                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1153
1154         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1155         if (lifetime != NULL) {
1156                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1157                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1158                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1159                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1160         }
1161         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1162         if (lifetime != NULL) {
1163                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1164                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1165                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1166                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1167         }
1168
1169         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1170         if (sec_ctx != NULL) {
1171                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1172
1173                 if (!uctx)
1174                         goto out;
1175
1176                 err = security_xfrm_state_alloc(x, uctx);
1177                 kfree(uctx);
1178
1179                 if (err)
1180                         goto out;
1181         }
1182
1183         err = -ENOBUFS;
1184         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1185         if (sa->sadb_sa_auth) {
1186                 int keysize = 0;
1187                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1188                 if (!a || !a->pfkey_supported) {
1189                         err = -ENOSYS;
1190                         goto out;
1191                 }
1192                 if (key)
1193                         keysize = (key->sadb_key_bits + 7) / 8;
1194                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1195                 if (!x->aalg) {
1196                         err = -ENOMEM;
1197                         goto out;
1198                 }
1199                 strcpy(x->aalg->alg_name, a->name);
1200                 x->aalg->alg_key_len = 0;
1201                 if (key) {
1202                         x->aalg->alg_key_len = key->sadb_key_bits;
1203                         memcpy(x->aalg->alg_key, key+1, keysize);
1204                 }
1205                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1206                 x->props.aalgo = sa->sadb_sa_auth;
1207                 /* x->algo.flags = sa->sadb_sa_flags; */
1208         }
1209         if (sa->sadb_sa_encrypt) {
1210                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1211                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1212                         if (!a || !a->pfkey_supported) {
1213                                 err = -ENOSYS;
1214                                 goto out;
1215                         }
1216                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1217                         if (!x->calg) {
1218                                 err = -ENOMEM;
1219                                 goto out;
1220                         }
1221                         strcpy(x->calg->alg_name, a->name);
1222                         x->props.calgo = sa->sadb_sa_encrypt;
1223                 } else {
1224                         int keysize = 0;
1225                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1226                         if (!a || !a->pfkey_supported) {
1227                                 err = -ENOSYS;
1228                                 goto out;
1229                         }
1230                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1231                         if (key)
1232                                 keysize = (key->sadb_key_bits + 7) / 8;
1233                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1234                         if (!x->ealg) {
1235                                 err = -ENOMEM;
1236                                 goto out;
1237                         }
1238                         strcpy(x->ealg->alg_name, a->name);
1239                         x->ealg->alg_key_len = 0;
1240                         if (key) {
1241                                 x->ealg->alg_key_len = key->sadb_key_bits;
1242                                 memcpy(x->ealg->alg_key, key+1, keysize);
1243                         }
1244                         x->props.ealgo = sa->sadb_sa_encrypt;
1245                         x->geniv = a->uinfo.encr.geniv;
1246                 }
1247         }
1248         /* x->algo.flags = sa->sadb_sa_flags; */
1249
1250         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1251                                                     &x->props.saddr);
1252         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1253                                   &x->id.daddr);
1254
1255         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1256                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1257                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1258                 if (mode < 0) {
1259                         err = -EINVAL;
1260                         goto out;
1261                 }
1262                 x->props.mode = mode;
1263                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1264         }
1265
1266         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1267                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1268
1269                 /* Nobody uses this, but we try. */
1270                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1271                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1272         }
1273
1274         if (!x->sel.family)
1275                 x->sel.family = x->props.family;
1276
1277         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1278                 const struct sadb_x_nat_t_type* n_type;
1279                 struct xfrm_encap_tmpl *natt;
1280
1281                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1282                 if (!x->encap) {
1283                         err = -ENOMEM;
1284                         goto out;
1285                 }
1286
1287                 natt = x->encap;
1288                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1289                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1290
1291                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1292                         const struct sadb_x_nat_t_port *n_port =
1293                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1294                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1295                 }
1296                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1297                         const struct sadb_x_nat_t_port *n_port =
1298                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1299                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1300                 }
1301                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1302         }
1303
1304         err = xfrm_init_state(x);
1305         if (err)
1306                 goto out;
1307
1308         x->km.seq = hdr->sadb_msg_seq;
1309         return x;
1310
1311 out:
1312         x->km.state = XFRM_STATE_DEAD;
1313         xfrm_state_put(x);
1314         return ERR_PTR(err);
1315 }
1316
1317 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1318 {
1319         return -EOPNOTSUPP;
1320 }
1321
1322 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1323 {
1324         struct net *net = sock_net(sk);
1325         struct sk_buff *resp_skb;
1326         struct sadb_x_sa2 *sa2;
1327         struct sadb_address *saddr, *daddr;
1328         struct sadb_msg *out_hdr;
1329         struct sadb_spirange *range;
1330         struct xfrm_state *x = NULL;
1331         int mode;
1332         int err;
1333         u32 min_spi, max_spi;
1334         u32 reqid;
1335         u8 proto;
1336         unsigned short family;
1337         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1338
1339         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1340                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1341                 return -EINVAL;
1342
1343         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1344         if (proto == 0)
1345                 return -EINVAL;
1346
1347         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1348                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1349                 if (mode < 0)
1350                         return -EINVAL;
1351                 reqid = sa2->sadb_x_sa2_reqid;
1352         } else {
1353                 mode = 0;
1354                 reqid = 0;
1355         }
1356
1357         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1358         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1359
1360         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1361         switch (family) {
1362         case AF_INET:
1363                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1364                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1365                 break;
1366 #if IS_ENABLED(CONFIG_IPV6)
1367         case AF_INET6:
1368                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1369                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1370                 break;
1371 #endif
1372         }
1373
1374         if (hdr->sadb_msg_seq) {
1375                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1376                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1377                         xfrm_state_put(x);
1378                         x = NULL;
1379                 }
1380         }
1381
1382         if (!x)
1383                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1384
1385         if (x == NULL)
1386                 return -ENOENT;
1387
1388         min_spi = 0x100;
1389         max_spi = 0x0fffffff;
1390
1391         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1392         if (range) {
1393                 min_spi = range->sadb_spirange_min;
1394                 max_spi = range->sadb_spirange_max;
1395         }
1396
1397         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1398         if (err) {
1399                 xfrm_state_put(x);
1400                 return err;
1401         }
1402
1403         err = xfrm_alloc_spi(x, min_spi, max_spi);
1404         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1405
1406         if (IS_ERR(resp_skb)) {
1407                 xfrm_state_put(x);
1408                 return  PTR_ERR(resp_skb);
1409         }
1410
1411         out_hdr = (struct sadb_msg *) resp_skb->data;
1412         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1413         out_hdr->sadb_msg_type = SADB_GETSPI;
1414         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1415         out_hdr->sadb_msg_errno = 0;
1416         out_hdr->sadb_msg_reserved = 0;
1417         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1418         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1419
1420         xfrm_state_put(x);
1421
1422         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1423
1424         return 0;
1425 }
1426
1427 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1428 {
1429         struct net *net = sock_net(sk);
1430         struct xfrm_state *x;
1431
1432         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1433                 return -EOPNOTSUPP;
1434
1435         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1436                 return 0;
1437
1438         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1439         if (x == NULL)
1440                 return 0;
1441
1442         spin_lock_bh(&x->lock);
1443         if (x->km.state == XFRM_STATE_ACQ)
1444                 x->km.state = XFRM_STATE_ERROR;
1445
1446         spin_unlock_bh(&x->lock);
1447         xfrm_state_put(x);
1448         return 0;
1449 }
1450
1451 static inline int event2poltype(int event)
1452 {
1453         switch (event) {
1454         case XFRM_MSG_DELPOLICY:
1455                 return SADB_X_SPDDELETE;
1456         case XFRM_MSG_NEWPOLICY:
1457                 return SADB_X_SPDADD;
1458         case XFRM_MSG_UPDPOLICY:
1459                 return SADB_X_SPDUPDATE;
1460         case XFRM_MSG_POLEXPIRE:
1461         //      return SADB_X_SPDEXPIRE;
1462         default:
1463                 pr_err("pfkey: Unknown policy event %d\n", event);
1464                 break;
1465         }
1466
1467         return 0;
1468 }
1469
1470 static inline int event2keytype(int event)
1471 {
1472         switch (event) {
1473         case XFRM_MSG_DELSA:
1474                 return SADB_DELETE;
1475         case XFRM_MSG_NEWSA:
1476                 return SADB_ADD;
1477         case XFRM_MSG_UPDSA:
1478                 return SADB_UPDATE;
1479         case XFRM_MSG_EXPIRE:
1480                 return SADB_EXPIRE;
1481         default:
1482                 pr_err("pfkey: Unknown SA event %d\n", event);
1483                 break;
1484         }
1485
1486         return 0;
1487 }
1488
1489 /* ADD/UPD/DEL */
1490 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1491 {
1492         struct sk_buff *skb;
1493         struct sadb_msg *hdr;
1494
1495         skb = pfkey_xfrm_state2msg(x);
1496
1497         if (IS_ERR(skb))
1498                 return PTR_ERR(skb);
1499
1500         hdr = (struct sadb_msg *) skb->data;
1501         hdr->sadb_msg_version = PF_KEY_V2;
1502         hdr->sadb_msg_type = event2keytype(c->event);
1503         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1504         hdr->sadb_msg_errno = 0;
1505         hdr->sadb_msg_reserved = 0;
1506         hdr->sadb_msg_seq = c->seq;
1507         hdr->sadb_msg_pid = c->portid;
1508
1509         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1510
1511         return 0;
1512 }
1513
1514 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1515 {
1516         struct net *net = sock_net(sk);
1517         struct xfrm_state *x;
1518         int err;
1519         struct km_event c;
1520
1521         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1522         if (IS_ERR(x))
1523                 return PTR_ERR(x);
1524
1525         xfrm_state_hold(x);
1526         if (hdr->sadb_msg_type == SADB_ADD)
1527                 err = xfrm_state_add(x);
1528         else
1529                 err = xfrm_state_update(x);
1530
1531         xfrm_audit_state_add(x, err ? 0 : 1, true);
1532
1533         if (err < 0) {
1534                 x->km.state = XFRM_STATE_DEAD;
1535                 __xfrm_state_put(x);
1536                 goto out;
1537         }
1538
1539         if (hdr->sadb_msg_type == SADB_ADD)
1540                 c.event = XFRM_MSG_NEWSA;
1541         else
1542                 c.event = XFRM_MSG_UPDSA;
1543         c.seq = hdr->sadb_msg_seq;
1544         c.portid = hdr->sadb_msg_pid;
1545         km_state_notify(x, &c);
1546 out:
1547         xfrm_state_put(x);
1548         return err;
1549 }
1550
1551 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1552 {
1553         struct net *net = sock_net(sk);
1554         struct xfrm_state *x;
1555         struct km_event c;
1556         int err;
1557
1558         if (!ext_hdrs[SADB_EXT_SA-1] ||
1559             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1560                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1561                 return -EINVAL;
1562
1563         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1564         if (x == NULL)
1565                 return -ESRCH;
1566
1567         if ((err = security_xfrm_state_delete(x)))
1568                 goto out;
1569
1570         if (xfrm_state_kern(x)) {
1571                 err = -EPERM;
1572                 goto out;
1573         }
1574
1575         err = xfrm_state_delete(x);
1576
1577         if (err < 0)
1578                 goto out;
1579
1580         c.seq = hdr->sadb_msg_seq;
1581         c.portid = hdr->sadb_msg_pid;
1582         c.event = XFRM_MSG_DELSA;
1583         km_state_notify(x, &c);
1584 out:
1585         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1586         xfrm_state_put(x);
1587
1588         return err;
1589 }
1590
1591 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1592 {
1593         struct net *net = sock_net(sk);
1594         __u8 proto;
1595         struct sk_buff *out_skb;
1596         struct sadb_msg *out_hdr;
1597         struct xfrm_state *x;
1598
1599         if (!ext_hdrs[SADB_EXT_SA-1] ||
1600             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1601                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1602                 return -EINVAL;
1603
1604         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1605         if (x == NULL)
1606                 return -ESRCH;
1607
1608         out_skb = pfkey_xfrm_state2msg(x);
1609         proto = x->id.proto;
1610         xfrm_state_put(x);
1611         if (IS_ERR(out_skb))
1612                 return  PTR_ERR(out_skb);
1613
1614         out_hdr = (struct sadb_msg *) out_skb->data;
1615         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1616         out_hdr->sadb_msg_type = SADB_GET;
1617         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1618         out_hdr->sadb_msg_errno = 0;
1619         out_hdr->sadb_msg_reserved = 0;
1620         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1621         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1622         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1623
1624         return 0;
1625 }
1626
1627 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1628                                               gfp_t allocation)
1629 {
1630         struct sk_buff *skb;
1631         struct sadb_msg *hdr;
1632         int len, auth_len, enc_len, i;
1633
1634         auth_len = xfrm_count_pfkey_auth_supported();
1635         if (auth_len) {
1636                 auth_len *= sizeof(struct sadb_alg);
1637                 auth_len += sizeof(struct sadb_supported);
1638         }
1639
1640         enc_len = xfrm_count_pfkey_enc_supported();
1641         if (enc_len) {
1642                 enc_len *= sizeof(struct sadb_alg);
1643                 enc_len += sizeof(struct sadb_supported);
1644         }
1645
1646         len = enc_len + auth_len + sizeof(struct sadb_msg);
1647
1648         skb = alloc_skb(len + 16, allocation);
1649         if (!skb)
1650                 goto out_put_algs;
1651
1652         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1653         pfkey_hdr_dup(hdr, orig);
1654         hdr->sadb_msg_errno = 0;
1655         hdr->sadb_msg_len = len / sizeof(uint64_t);
1656
1657         if (auth_len) {
1658                 struct sadb_supported *sp;
1659                 struct sadb_alg *ap;
1660
1661                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1662                 ap = (struct sadb_alg *) (sp + 1);
1663
1664                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1665                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1666
1667                 for (i = 0; ; i++) {
1668                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1669                         if (!aalg)
1670                                 break;
1671                         if (!aalg->pfkey_supported)
1672                                 continue;
1673                         if (aalg->available)
1674                                 *ap++ = aalg->desc;
1675                 }
1676         }
1677
1678         if (enc_len) {
1679                 struct sadb_supported *sp;
1680                 struct sadb_alg *ap;
1681
1682                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1683                 ap = (struct sadb_alg *) (sp + 1);
1684
1685                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1686                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1687
1688                 for (i = 0; ; i++) {
1689                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1690                         if (!ealg)
1691                                 break;
1692                         if (!ealg->pfkey_supported)
1693                                 continue;
1694                         if (ealg->available)
1695                                 *ap++ = ealg->desc;
1696                 }
1697         }
1698
1699 out_put_algs:
1700         return skb;
1701 }
1702
1703 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1704 {
1705         struct pfkey_sock *pfk = pfkey_sk(sk);
1706         struct sk_buff *supp_skb;
1707
1708         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1709                 return -EINVAL;
1710
1711         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1712                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1713                         return -EEXIST;
1714                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1715         }
1716
1717         xfrm_probe_algs();
1718
1719         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1720         if (!supp_skb) {
1721                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1722                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1723
1724                 return -ENOBUFS;
1725         }
1726
1727         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1728                         sock_net(sk));
1729         return 0;
1730 }
1731
1732 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1733 {
1734         struct sk_buff *skb;
1735         struct sadb_msg *hdr;
1736
1737         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1738         if (!skb)
1739                 return -ENOBUFS;
1740
1741         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1742         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1743         hdr->sadb_msg_errno = (uint8_t) 0;
1744         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1745
1746         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1747                                sock_net(sk));
1748 }
1749
1750 static int key_notify_sa_flush(const struct km_event *c)
1751 {
1752         struct sk_buff *skb;
1753         struct sadb_msg *hdr;
1754
1755         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1756         if (!skb)
1757                 return -ENOBUFS;
1758         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1759         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1760         hdr->sadb_msg_type = SADB_FLUSH;
1761         hdr->sadb_msg_seq = c->seq;
1762         hdr->sadb_msg_pid = c->portid;
1763         hdr->sadb_msg_version = PF_KEY_V2;
1764         hdr->sadb_msg_errno = (uint8_t) 0;
1765         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1766         hdr->sadb_msg_reserved = 0;
1767
1768         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1769
1770         return 0;
1771 }
1772
1773 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1774 {
1775         struct net *net = sock_net(sk);
1776         unsigned int proto;
1777         struct km_event c;
1778         int err, err2;
1779
1780         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1781         if (proto == 0)
1782                 return -EINVAL;
1783
1784         err = xfrm_state_flush(net, proto, true);
1785         err2 = unicast_flush_resp(sk, hdr);
1786         if (err || err2) {
1787                 if (err == -ESRCH) /* empty table - go quietly */
1788                         err = 0;
1789                 return err ? err : err2;
1790         }
1791
1792         c.data.proto = proto;
1793         c.seq = hdr->sadb_msg_seq;
1794         c.portid = hdr->sadb_msg_pid;
1795         c.event = XFRM_MSG_FLUSHSA;
1796         c.net = net;
1797         km_state_notify(NULL, &c);
1798
1799         return 0;
1800 }
1801
1802 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1803 {
1804         struct pfkey_sock *pfk = ptr;
1805         struct sk_buff *out_skb;
1806         struct sadb_msg *out_hdr;
1807
1808         if (!pfkey_can_dump(&pfk->sk))
1809                 return -ENOBUFS;
1810
1811         out_skb = pfkey_xfrm_state2msg(x);
1812         if (IS_ERR(out_skb))
1813                 return PTR_ERR(out_skb);
1814
1815         out_hdr = (struct sadb_msg *) out_skb->data;
1816         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1817         out_hdr->sadb_msg_type = SADB_DUMP;
1818         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1819         out_hdr->sadb_msg_errno = 0;
1820         out_hdr->sadb_msg_reserved = 0;
1821         out_hdr->sadb_msg_seq = count + 1;
1822         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1823
1824         if (pfk->dump.skb)
1825                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1826                                 &pfk->sk, sock_net(&pfk->sk));
1827         pfk->dump.skb = out_skb;
1828
1829         return 0;
1830 }
1831
1832 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1833 {
1834         struct net *net = sock_net(&pfk->sk);
1835         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1836 }
1837
1838 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1839 {
1840         struct net *net = sock_net(&pfk->sk);
1841
1842         xfrm_state_walk_done(&pfk->dump.u.state, net);
1843 }
1844
1845 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1846 {
1847         u8 proto;
1848         struct xfrm_address_filter *filter = NULL;
1849         struct pfkey_sock *pfk = pfkey_sk(sk);
1850
1851         mutex_lock(&pfk->dump_lock);
1852         if (pfk->dump.dump != NULL) {
1853                 mutex_unlock(&pfk->dump_lock);
1854                 return -EBUSY;
1855         }
1856
1857         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1858         if (proto == 0) {
1859                 mutex_unlock(&pfk->dump_lock);
1860                 return -EINVAL;
1861         }
1862
1863         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1864                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1865
1866                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1867                 if (filter == NULL) {
1868                         mutex_unlock(&pfk->dump_lock);
1869                         return -ENOMEM;
1870                 }
1871
1872                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1873                        sizeof(xfrm_address_t));
1874                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1875                        sizeof(xfrm_address_t));
1876                 filter->family = xfilter->sadb_x_filter_family;
1877                 filter->splen = xfilter->sadb_x_filter_splen;
1878                 filter->dplen = xfilter->sadb_x_filter_dplen;
1879         }
1880
1881         pfk->dump.msg_version = hdr->sadb_msg_version;
1882         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1883         pfk->dump.dump = pfkey_dump_sa;
1884         pfk->dump.done = pfkey_dump_sa_done;
1885         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1886         mutex_unlock(&pfk->dump_lock);
1887
1888         return pfkey_do_dump(pfk);
1889 }
1890
1891 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1892 {
1893         struct pfkey_sock *pfk = pfkey_sk(sk);
1894         int satype = hdr->sadb_msg_satype;
1895         bool reset_errno = false;
1896
1897         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1898                 reset_errno = true;
1899                 if (satype != 0 && satype != 1)
1900                         return -EINVAL;
1901                 pfk->promisc = satype;
1902         }
1903         if (reset_errno && skb_cloned(skb))
1904                 skb = skb_copy(skb, GFP_KERNEL);
1905         else
1906                 skb = skb_clone(skb, GFP_KERNEL);
1907
1908         if (reset_errno && skb) {
1909                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1910                 new_hdr->sadb_msg_errno = 0;
1911         }
1912
1913         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1914         return 0;
1915 }
1916
1917 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1918 {
1919         int i;
1920         u32 reqid = *(u32*)ptr;
1921
1922         for (i=0; i<xp->xfrm_nr; i++) {
1923                 if (xp->xfrm_vec[i].reqid == reqid)
1924                         return -EEXIST;
1925         }
1926         return 0;
1927 }
1928
1929 static u32 gen_reqid(struct net *net)
1930 {
1931         struct xfrm_policy_walk walk;
1932         u32 start;
1933         int rc;
1934         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1935
1936         start = reqid;
1937         do {
1938                 ++reqid;
1939                 if (reqid == 0)
1940                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1941                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1942                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1943                 xfrm_policy_walk_done(&walk, net);
1944                 if (rc != -EEXIST)
1945                         return reqid;
1946         } while (reqid != start);
1947         return 0;
1948 }
1949
1950 static int
1951 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1952 {
1953         struct net *net = xp_net(xp);
1954         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1955         int mode;
1956
1957         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1958                 return -ELOOP;
1959
1960         if (rq->sadb_x_ipsecrequest_mode == 0)
1961                 return -EINVAL;
1962         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1963                 return -EINVAL;
1964
1965         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1966         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1967                 return -EINVAL;
1968         t->mode = mode;
1969         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1970                 t->optional = 1;
1971         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1972                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1973                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1974                         t->reqid = 0;
1975                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1976                         return -ENOBUFS;
1977         }
1978
1979         /* addresses present only in tunnel mode */
1980         if (t->mode == XFRM_MODE_TUNNEL) {
1981                 int err;
1982
1983                 err = parse_sockaddr_pair(
1984                         (struct sockaddr *)(rq + 1),
1985                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1986                         &t->saddr, &t->id.daddr, &t->encap_family);
1987                 if (err)
1988                         return err;
1989         } else
1990                 t->encap_family = xp->family;
1991
1992         /* No way to set this via kame pfkey */
1993         t->allalgs = 1;
1994         xp->xfrm_nr++;
1995         return 0;
1996 }
1997
1998 static int
1999 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2000 {
2001         int err;
2002         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2003         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2004
2005         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2006                 return -EINVAL;
2007
2008         while (len >= sizeof(*rq)) {
2009                 if (len < rq->sadb_x_ipsecrequest_len ||
2010                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2011                         return -EINVAL;
2012
2013                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2014                         return err;
2015                 len -= rq->sadb_x_ipsecrequest_len;
2016                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2017         }
2018         return 0;
2019 }
2020
2021 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2022 {
2023   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2024
2025         if (xfrm_ctx) {
2026                 int len = sizeof(struct sadb_x_sec_ctx);
2027                 len += xfrm_ctx->ctx_len;
2028                 return PFKEY_ALIGN8(len);
2029         }
2030         return 0;
2031 }
2032
2033 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2034 {
2035         const struct xfrm_tmpl *t;
2036         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2037         int socklen = 0;
2038         int i;
2039
2040         for (i=0; i<xp->xfrm_nr; i++) {
2041                 t = xp->xfrm_vec + i;
2042                 socklen += pfkey_sockaddr_len(t->encap_family);
2043         }
2044
2045         return sizeof(struct sadb_msg) +
2046                 (sizeof(struct sadb_lifetime) * 3) +
2047                 (sizeof(struct sadb_address) * 2) +
2048                 (sockaddr_size * 2) +
2049                 sizeof(struct sadb_x_policy) +
2050                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2051                 (socklen * 2) +
2052                 pfkey_xfrm_policy2sec_ctx_size(xp);
2053 }
2054
2055 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2056 {
2057         struct sk_buff *skb;
2058         int size;
2059
2060         size = pfkey_xfrm_policy2msg_size(xp);
2061
2062         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2063         if (skb == NULL)
2064                 return ERR_PTR(-ENOBUFS);
2065
2066         return skb;
2067 }
2068
2069 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2070 {
2071         struct sadb_msg *hdr;
2072         struct sadb_address *addr;
2073         struct sadb_lifetime *lifetime;
2074         struct sadb_x_policy *pol;
2075         struct sadb_x_sec_ctx *sec_ctx;
2076         struct xfrm_sec_ctx *xfrm_ctx;
2077         int i;
2078         int size;
2079         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2080         int socklen = pfkey_sockaddr_len(xp->family);
2081
2082         size = pfkey_xfrm_policy2msg_size(xp);
2083
2084         /* call should fill header later */
2085         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2086         memset(hdr, 0, size);   /* XXX do we need this ? */
2087
2088         /* src address */
2089         addr = (struct sadb_address*) skb_put(skb,
2090                                               sizeof(struct sadb_address)+sockaddr_size);
2091         addr->sadb_address_len =
2092                 (sizeof(struct sadb_address)+sockaddr_size)/
2093                         sizeof(uint64_t);
2094         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2095         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2096         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2097         addr->sadb_address_reserved = 0;
2098         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2099                                  xp->selector.sport,
2100                                  (struct sockaddr *) (addr + 1),
2101                                  xp->family))
2102                 BUG();
2103
2104         /* dst address */
2105         addr = (struct sadb_address*) skb_put(skb,
2106                                               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 = (struct sadb_lifetime *)  skb_put(skb,
2121                                                      sizeof(struct sadb_lifetime));
2122         lifetime->sadb_lifetime_len =
2123                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2124         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2125         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2126         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2127         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2128         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2129         /* soft time */
2130         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2131                                                      sizeof(struct sadb_lifetime));
2132         lifetime->sadb_lifetime_len =
2133                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2134         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2135         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2136         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2137         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2138         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2139         /* current time */
2140         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2141                                                      sizeof(struct sadb_lifetime));
2142         lifetime->sadb_lifetime_len =
2143                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2144         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2145         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2146         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2147         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2148         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2149
2150         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2151         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2152         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2153         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2154         if (xp->action == XFRM_POLICY_ALLOW) {
2155                 if (xp->xfrm_nr)
2156                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2157                 else
2158                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2159         }
2160         pol->sadb_x_policy_dir = dir+1;
2161         pol->sadb_x_policy_reserved = 0;
2162         pol->sadb_x_policy_id = xp->index;
2163         pol->sadb_x_policy_priority = xp->priority;
2164
2165         for (i=0; i<xp->xfrm_nr; i++) {
2166                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2167                 struct sadb_x_ipsecrequest *rq;
2168                 int req_size;
2169                 int mode;
2170
2171                 req_size = sizeof(struct sadb_x_ipsecrequest);
2172                 if (t->mode == XFRM_MODE_TUNNEL) {
2173                         socklen = pfkey_sockaddr_len(t->encap_family);
2174                         req_size += socklen * 2;
2175                 } else {
2176                         size -= 2*socklen;
2177                 }
2178                 rq = (void*)skb_put(skb, req_size);
2179                 pol->sadb_x_policy_len += req_size/8;
2180                 memset(rq, 0, sizeof(*rq));
2181                 rq->sadb_x_ipsecrequest_len = req_size;
2182                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2183                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2184                         return -EINVAL;
2185                 rq->sadb_x_ipsecrequest_mode = mode;
2186                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2187                 if (t->reqid)
2188                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2189                 if (t->optional)
2190                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2191                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2192
2193                 if (t->mode == XFRM_MODE_TUNNEL) {
2194                         u8 *sa = (void *)(rq + 1);
2195                         pfkey_sockaddr_fill(&t->saddr, 0,
2196                                             (struct sockaddr *)sa,
2197                                             t->encap_family);
2198                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2199                                             (struct sockaddr *) (sa + socklen),
2200                                             t->encap_family);
2201                 }
2202         }
2203
2204         /* security context */
2205         if ((xfrm_ctx = xp->security)) {
2206                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2207
2208                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2209                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2210                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2211                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2212                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2213                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2214                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2215                        xfrm_ctx->ctx_len);
2216         }
2217
2218         hdr->sadb_msg_len = size / sizeof(uint64_t);
2219         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2220
2221         return 0;
2222 }
2223
2224 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2225 {
2226         struct sk_buff *out_skb;
2227         struct sadb_msg *out_hdr;
2228         int err;
2229
2230         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2231         if (IS_ERR(out_skb))
2232                 return PTR_ERR(out_skb);
2233
2234         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2235         if (err < 0)
2236                 return err;
2237
2238         out_hdr = (struct sadb_msg *) out_skb->data;
2239         out_hdr->sadb_msg_version = PF_KEY_V2;
2240
2241         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2242                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2243         else
2244                 out_hdr->sadb_msg_type = event2poltype(c->event);
2245         out_hdr->sadb_msg_errno = 0;
2246         out_hdr->sadb_msg_seq = c->seq;
2247         out_hdr->sadb_msg_pid = c->portid;
2248         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2249         return 0;
2250
2251 }
2252
2253 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2254 {
2255         struct net *net = sock_net(sk);
2256         int err = 0;
2257         struct sadb_lifetime *lifetime;
2258         struct sadb_address *sa;
2259         struct sadb_x_policy *pol;
2260         struct xfrm_policy *xp;
2261         struct km_event c;
2262         struct sadb_x_sec_ctx *sec_ctx;
2263
2264         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2265                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2266             !ext_hdrs[SADB_X_EXT_POLICY-1])
2267                 return -EINVAL;
2268
2269         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2270         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2271                 return -EINVAL;
2272         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2273                 return -EINVAL;
2274
2275         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2276         if (xp == NULL)
2277                 return -ENOBUFS;
2278
2279         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2280                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2281         xp->priority = pol->sadb_x_policy_priority;
2282
2283         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2284         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2285         xp->selector.family = xp->family;
2286         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2287         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2288         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2289         if (xp->selector.sport)
2290                 xp->selector.sport_mask = htons(0xffff);
2291
2292         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2293         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2294         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2295
2296         /* Amusing, we set this twice.  KAME apps appear to set same value
2297          * in both addresses.
2298          */
2299         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2300
2301         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2302         if (xp->selector.dport)
2303                 xp->selector.dport_mask = htons(0xffff);
2304
2305         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2306         if (sec_ctx != NULL) {
2307                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2308
2309                 if (!uctx) {
2310                         err = -ENOBUFS;
2311                         goto out;
2312                 }
2313
2314                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2315                 kfree(uctx);
2316
2317                 if (err)
2318                         goto out;
2319         }
2320
2321         xp->lft.soft_byte_limit = XFRM_INF;
2322         xp->lft.hard_byte_limit = XFRM_INF;
2323         xp->lft.soft_packet_limit = XFRM_INF;
2324         xp->lft.hard_packet_limit = XFRM_INF;
2325         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2326                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2327                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2328                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2329                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2330         }
2331         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2332                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2333                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2334                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2335                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2336         }
2337         xp->xfrm_nr = 0;
2338         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2339             (err = parse_ipsecrequests(xp, pol)) < 0)
2340                 goto out;
2341
2342         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2343                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2344
2345         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2346
2347         if (err)
2348                 goto out;
2349
2350         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2351                 c.event = XFRM_MSG_UPDPOLICY;
2352         else
2353                 c.event = XFRM_MSG_NEWPOLICY;
2354
2355         c.seq = hdr->sadb_msg_seq;
2356         c.portid = hdr->sadb_msg_pid;
2357
2358         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2359         xfrm_pol_put(xp);
2360         return 0;
2361
2362 out:
2363         xp->walk.dead = 1;
2364         xfrm_policy_destroy(xp);
2365         return err;
2366 }
2367
2368 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2369 {
2370         struct net *net = sock_net(sk);
2371         int err;
2372         struct sadb_address *sa;
2373         struct sadb_x_policy *pol;
2374         struct xfrm_policy *xp;
2375         struct xfrm_selector sel;
2376         struct km_event c;
2377         struct sadb_x_sec_ctx *sec_ctx;
2378         struct xfrm_sec_ctx *pol_ctx = NULL;
2379
2380         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2381                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2382             !ext_hdrs[SADB_X_EXT_POLICY-1])
2383                 return -EINVAL;
2384
2385         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2386         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2387                 return -EINVAL;
2388
2389         memset(&sel, 0, sizeof(sel));
2390
2391         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2392         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2393         sel.prefixlen_s = sa->sadb_address_prefixlen;
2394         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2395         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2396         if (sel.sport)
2397                 sel.sport_mask = htons(0xffff);
2398
2399         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2400         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2401         sel.prefixlen_d = sa->sadb_address_prefixlen;
2402         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2403         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2404         if (sel.dport)
2405                 sel.dport_mask = htons(0xffff);
2406
2407         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2408         if (sec_ctx != NULL) {
2409                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2410
2411                 if (!uctx)
2412                         return -ENOMEM;
2413
2414                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2415                 kfree(uctx);
2416                 if (err)
2417                         return err;
2418         }
2419
2420         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2421                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2422                                    1, &err);
2423         security_xfrm_policy_free(pol_ctx);
2424         if (xp == NULL)
2425                 return -ENOENT;
2426
2427         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2428
2429         if (err)
2430                 goto out;
2431
2432         c.seq = hdr->sadb_msg_seq;
2433         c.portid = hdr->sadb_msg_pid;
2434         c.data.byid = 0;
2435         c.event = XFRM_MSG_DELPOLICY;
2436         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2437
2438 out:
2439         xfrm_pol_put(xp);
2440         if (err == 0)
2441                 xfrm_garbage_collect(net);
2442         return err;
2443 }
2444
2445 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2446 {
2447         int err;
2448         struct sk_buff *out_skb;
2449         struct sadb_msg *out_hdr;
2450         err = 0;
2451
2452         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2453         if (IS_ERR(out_skb)) {
2454                 err =  PTR_ERR(out_skb);
2455                 goto out;
2456         }
2457         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2458         if (err < 0) {
2459                 kfree_skb(out_skb);
2460                 goto out;
2461         }
2462
2463         out_hdr = (struct sadb_msg *) out_skb->data;
2464         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2465         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2466         out_hdr->sadb_msg_satype = 0;
2467         out_hdr->sadb_msg_errno = 0;
2468         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2469         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2470         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2471         err = 0;
2472
2473 out:
2474         return err;
2475 }
2476
2477 static int pfkey_sockaddr_pair_size(sa_family_t family)
2478 {
2479         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2480 }
2481
2482 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2483                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2484                                u16 *family)
2485 {
2486         int af, socklen;
2487
2488         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2489                 return -EINVAL;
2490
2491         af = pfkey_sockaddr_extract(sa, saddr);
2492         if (!af)
2493                 return -EINVAL;
2494
2495         socklen = pfkey_sockaddr_len(af);
2496         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2497                                    daddr) != af)
2498                 return -EINVAL;
2499
2500         *family = af;
2501         return 0;
2502 }
2503
2504 #ifdef CONFIG_NET_KEY_MIGRATE
2505 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2506                                     struct xfrm_migrate *m)
2507 {
2508         int err;
2509         struct sadb_x_ipsecrequest *rq2;
2510         int mode;
2511
2512         if (len < sizeof(*rq1) ||
2513             len < rq1->sadb_x_ipsecrequest_len ||
2514             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2515                 return -EINVAL;
2516
2517         /* old endoints */
2518         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2519                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2520                                   &m->old_saddr, &m->old_daddr,
2521                                   &m->old_family);
2522         if (err)
2523                 return err;
2524
2525         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2526         len -= rq1->sadb_x_ipsecrequest_len;
2527
2528         if (len <= sizeof(*rq2) ||
2529             len < rq2->sadb_x_ipsecrequest_len ||
2530             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2531                 return -EINVAL;
2532
2533         /* new endpoints */
2534         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2535                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2536                                   &m->new_saddr, &m->new_daddr,
2537                                   &m->new_family);
2538         if (err)
2539                 return err;
2540
2541         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2542             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2543             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2544                 return -EINVAL;
2545
2546         m->proto = rq1->sadb_x_ipsecrequest_proto;
2547         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2548                 return -EINVAL;
2549         m->mode = mode;
2550         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2551
2552         return ((int)(rq1->sadb_x_ipsecrequest_len +
2553                       rq2->sadb_x_ipsecrequest_len));
2554 }
2555
2556 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2557                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2558 {
2559         int i, len, ret, err = -EINVAL;
2560         u8 dir;
2561         struct sadb_address *sa;
2562         struct sadb_x_kmaddress *kma;
2563         struct sadb_x_policy *pol;
2564         struct sadb_x_ipsecrequest *rq;
2565         struct xfrm_selector sel;
2566         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2567         struct xfrm_kmaddress k;
2568         struct net *net = sock_net(sk);
2569
2570         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2571                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2572             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2573                 err = -EINVAL;
2574                 goto out;
2575         }
2576
2577         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2578         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2579
2580         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2581                 err = -EINVAL;
2582                 goto out;
2583         }
2584
2585         if (kma) {
2586                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2587                 k.reserved = kma->sadb_x_kmaddress_reserved;
2588                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2589                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2590                                           &k.local, &k.remote, &k.family);
2591                 if (ret < 0) {
2592                         err = ret;
2593                         goto out;
2594                 }
2595         }
2596
2597         dir = pol->sadb_x_policy_dir - 1;
2598         memset(&sel, 0, sizeof(sel));
2599
2600         /* set source address info of selector */
2601         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2602         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2603         sel.prefixlen_s = sa->sadb_address_prefixlen;
2604         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2605         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2606         if (sel.sport)
2607                 sel.sport_mask = htons(0xffff);
2608
2609         /* set destination address info of selector */
2610         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2611         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2612         sel.prefixlen_d = sa->sadb_address_prefixlen;
2613         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2614         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2615         if (sel.dport)
2616                 sel.dport_mask = htons(0xffff);
2617
2618         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2619
2620         /* extract ipsecrequests */
2621         i = 0;
2622         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2623
2624         while (len > 0 && i < XFRM_MAX_DEPTH) {
2625                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2626                 if (ret < 0) {
2627                         err = ret;
2628                         goto out;
2629                 } else {
2630                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2631                         len -= ret;
2632                         i++;
2633                 }
2634         }
2635
2636         if (!i || len > 0) {
2637                 err = -EINVAL;
2638                 goto out;
2639         }
2640
2641         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2642                             kma ? &k : NULL, net);
2643
2644  out:
2645         return err;
2646 }
2647 #else
2648 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2649                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2650 {
2651         return -ENOPROTOOPT;
2652 }
2653 #endif
2654
2655
2656 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2657 {
2658         struct net *net = sock_net(sk);
2659         unsigned int dir;
2660         int err = 0, delete;
2661         struct sadb_x_policy *pol;
2662         struct xfrm_policy *xp;
2663         struct km_event c;
2664
2665         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2666                 return -EINVAL;
2667
2668         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2669         if (dir >= XFRM_POLICY_MAX)
2670                 return -EINVAL;
2671
2672         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2673         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2674                               dir, pol->sadb_x_policy_id, delete, &err);
2675         if (xp == NULL)
2676                 return -ENOENT;
2677
2678         if (delete) {
2679                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2680
2681                 if (err)
2682                         goto out;
2683                 c.seq = hdr->sadb_msg_seq;
2684                 c.portid = hdr->sadb_msg_pid;
2685                 c.data.byid = 1;
2686                 c.event = XFRM_MSG_DELPOLICY;
2687                 km_policy_notify(xp, dir, &c);
2688         } else {
2689                 err = key_pol_get_resp(sk, xp, hdr, dir);
2690         }
2691
2692 out:
2693         xfrm_pol_put(xp);
2694         if (delete && err == 0)
2695                 xfrm_garbage_collect(net);
2696         return err;
2697 }
2698
2699 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2700 {
2701         struct pfkey_sock *pfk = ptr;
2702         struct sk_buff *out_skb;
2703         struct sadb_msg *out_hdr;
2704         int err;
2705
2706         if (!pfkey_can_dump(&pfk->sk))
2707                 return -ENOBUFS;
2708
2709         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2710         if (IS_ERR(out_skb))
2711                 return PTR_ERR(out_skb);
2712
2713         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2714         if (err < 0) {
2715                 kfree_skb(out_skb);
2716                 return err;
2717         }
2718
2719         out_hdr = (struct sadb_msg *) out_skb->data;
2720         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2721         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2722         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2723         out_hdr->sadb_msg_errno = 0;
2724         out_hdr->sadb_msg_seq = count + 1;
2725         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2726
2727         if (pfk->dump.skb)
2728                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2729                                 &pfk->sk, sock_net(&pfk->sk));
2730         pfk->dump.skb = out_skb;
2731
2732         return 0;
2733 }
2734
2735 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2736 {
2737         struct net *net = sock_net(&pfk->sk);
2738         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2739 }
2740
2741 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2742 {
2743         struct net *net = sock_net((struct sock *)pfk);
2744
2745         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2746 }
2747
2748 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2749 {
2750         struct pfkey_sock *pfk = pfkey_sk(sk);
2751
2752         mutex_lock(&pfk->dump_lock);
2753         if (pfk->dump.dump != NULL) {
2754                 mutex_unlock(&pfk->dump_lock);
2755                 return -EBUSY;
2756         }
2757
2758         pfk->dump.msg_version = hdr->sadb_msg_version;
2759         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2760         pfk->dump.dump = pfkey_dump_sp;
2761         pfk->dump.done = pfkey_dump_sp_done;
2762         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2763         mutex_unlock(&pfk->dump_lock);
2764
2765         return pfkey_do_dump(pfk);
2766 }
2767
2768 static int key_notify_policy_flush(const struct km_event *c)
2769 {
2770         struct sk_buff *skb_out;
2771         struct sadb_msg *hdr;
2772
2773         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2774         if (!skb_out)
2775                 return -ENOBUFS;
2776         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2777         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2778         hdr->sadb_msg_seq = c->seq;
2779         hdr->sadb_msg_pid = c->portid;
2780         hdr->sadb_msg_version = PF_KEY_V2;
2781         hdr->sadb_msg_errno = (uint8_t) 0;
2782         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2783         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2784         hdr->sadb_msg_reserved = 0;
2785         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2786         return 0;
2787
2788 }
2789
2790 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2791 {
2792         struct net *net = sock_net(sk);
2793         struct km_event c;
2794         int err, err2;
2795
2796         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2797         err2 = unicast_flush_resp(sk, hdr);
2798         if (err || err2) {
2799                 if (err == -ESRCH) /* empty table - old silent behavior */
2800                         return 0;
2801                 return err;
2802         }
2803
2804         c.data.type = XFRM_POLICY_TYPE_MAIN;
2805         c.event = XFRM_MSG_FLUSHPOLICY;
2806         c.portid = hdr->sadb_msg_pid;
2807         c.seq = hdr->sadb_msg_seq;
2808         c.net = net;
2809         km_policy_notify(NULL, 0, &c);
2810
2811         return 0;
2812 }
2813
2814 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2815                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2816 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2817         [SADB_RESERVED]         = pfkey_reserved,
2818         [SADB_GETSPI]           = pfkey_getspi,
2819         [SADB_UPDATE]           = pfkey_add,
2820         [SADB_ADD]              = pfkey_add,
2821         [SADB_DELETE]           = pfkey_delete,
2822         [SADB_GET]              = pfkey_get,
2823         [SADB_ACQUIRE]          = pfkey_acquire,
2824         [SADB_REGISTER]         = pfkey_register,
2825         [SADB_EXPIRE]           = NULL,
2826         [SADB_FLUSH]            = pfkey_flush,
2827         [SADB_DUMP]             = pfkey_dump,
2828         [SADB_X_PROMISC]        = pfkey_promisc,
2829         [SADB_X_PCHANGE]        = NULL,
2830         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2831         [SADB_X_SPDADD]         = pfkey_spdadd,
2832         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2833         [SADB_X_SPDGET]         = pfkey_spdget,
2834         [SADB_X_SPDACQUIRE]     = NULL,
2835         [SADB_X_SPDDUMP]        = pfkey_spddump,
2836         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2837         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2838         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2839         [SADB_X_MIGRATE]        = pfkey_migrate,
2840 };
2841
2842 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2843 {
2844         void *ext_hdrs[SADB_EXT_MAX];
2845         int err;
2846
2847         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2848                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2849
2850         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2851         err = parse_exthdrs(skb, hdr, ext_hdrs);
2852         if (!err) {
2853                 err = -EOPNOTSUPP;
2854                 if (pfkey_funcs[hdr->sadb_msg_type])
2855                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2856         }
2857         return err;
2858 }
2859
2860 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2861 {
2862         struct sadb_msg *hdr = NULL;
2863
2864         if (skb->len < sizeof(*hdr)) {
2865                 *errp = -EMSGSIZE;
2866         } else {
2867                 hdr = (struct sadb_msg *) skb->data;
2868                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2869                     hdr->sadb_msg_reserved != 0 ||
2870                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2871                      hdr->sadb_msg_type > SADB_MAX)) {
2872                         hdr = NULL;
2873                         *errp = -EINVAL;
2874                 } else if (hdr->sadb_msg_len != (skb->len /
2875                                                  sizeof(uint64_t)) ||
2876                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2877                                                 sizeof(uint64_t))) {
2878                         hdr = NULL;
2879                         *errp = -EMSGSIZE;
2880                 } else {
2881                         *errp = 0;
2882                 }
2883         }
2884         return hdr;
2885 }
2886
2887 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2888                                 const struct xfrm_algo_desc *d)
2889 {
2890         unsigned int id = d->desc.sadb_alg_id;
2891
2892         if (id >= sizeof(t->aalgos) * 8)
2893                 return 0;
2894
2895         return (t->aalgos >> id) & 1;
2896 }
2897
2898 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2899                                 const struct xfrm_algo_desc *d)
2900 {
2901         unsigned int id = d->desc.sadb_alg_id;
2902
2903         if (id >= sizeof(t->ealgos) * 8)
2904                 return 0;
2905
2906         return (t->ealgos >> id) & 1;
2907 }
2908
2909 static int count_ah_combs(const struct xfrm_tmpl *t)
2910 {
2911         int i, sz = 0;
2912
2913         for (i = 0; ; i++) {
2914                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2915                 if (!aalg)
2916                         break;
2917                 if (!aalg->pfkey_supported)
2918                         continue;
2919                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2920                         sz += sizeof(struct sadb_comb);
2921         }
2922         return sz + sizeof(struct sadb_prop);
2923 }
2924
2925 static int count_esp_combs(const struct xfrm_tmpl *t)
2926 {
2927         int i, k, sz = 0;
2928
2929         for (i = 0; ; i++) {
2930                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2931                 if (!ealg)
2932                         break;
2933
2934                 if (!ealg->pfkey_supported)
2935                         continue;
2936
2937                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2938                         continue;
2939
2940                 for (k = 1; ; k++) {
2941                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2942                         if (!aalg)
2943                                 break;
2944
2945                         if (!aalg->pfkey_supported)
2946                                 continue;
2947
2948                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2949                                 sz += sizeof(struct sadb_comb);
2950                 }
2951         }
2952         return sz + sizeof(struct sadb_prop);
2953 }
2954
2955 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2956 {
2957         struct sadb_prop *p;
2958         int i;
2959
2960         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2961         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2962         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2963         p->sadb_prop_replay = 32;
2964         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2965
2966         for (i = 0; ; i++) {
2967                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2968                 if (!aalg)
2969                         break;
2970
2971                 if (!aalg->pfkey_supported)
2972                         continue;
2973
2974                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2975                         struct sadb_comb *c;
2976                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2977                         memset(c, 0, sizeof(*c));
2978                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2979                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2980                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2981                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2982                         c->sadb_comb_hard_addtime = 24*60*60;
2983                         c->sadb_comb_soft_addtime = 20*60*60;
2984                         c->sadb_comb_hard_usetime = 8*60*60;
2985                         c->sadb_comb_soft_usetime = 7*60*60;
2986                 }
2987         }
2988 }
2989
2990 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2991 {
2992         struct sadb_prop *p;
2993         int i, k;
2994
2995         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2996         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2997         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2998         p->sadb_prop_replay = 32;
2999         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3000
3001         for (i=0; ; i++) {
3002                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3003                 if (!ealg)
3004                         break;
3005
3006                 if (!ealg->pfkey_supported)
3007                         continue;
3008
3009                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3010                         continue;
3011
3012                 for (k = 1; ; k++) {
3013                         struct sadb_comb *c;
3014                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3015                         if (!aalg)
3016                                 break;
3017                         if (!aalg->pfkey_supported)
3018                                 continue;
3019                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3020                                 continue;
3021                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
3022                         memset(c, 0, sizeof(*c));
3023                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3024                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3025                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3026                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3027                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3028                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3029                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3030                         c->sadb_comb_hard_addtime = 24*60*60;
3031                         c->sadb_comb_soft_addtime = 20*60*60;
3032                         c->sadb_comb_hard_usetime = 8*60*60;
3033                         c->sadb_comb_soft_usetime = 7*60*60;
3034                 }
3035         }
3036 }
3037
3038 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3039 {
3040         return 0;
3041 }
3042
3043 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3044 {
3045         struct sk_buff *out_skb;
3046         struct sadb_msg *out_hdr;
3047         int hard;
3048         int hsc;
3049
3050         hard = c->data.hard;
3051         if (hard)
3052                 hsc = 2;
3053         else
3054                 hsc = 1;
3055
3056         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3057         if (IS_ERR(out_skb))
3058                 return PTR_ERR(out_skb);
3059
3060         out_hdr = (struct sadb_msg *) out_skb->data;
3061         out_hdr->sadb_msg_version = PF_KEY_V2;
3062         out_hdr->sadb_msg_type = SADB_EXPIRE;
3063         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3064         out_hdr->sadb_msg_errno = 0;
3065         out_hdr->sadb_msg_reserved = 0;
3066         out_hdr->sadb_msg_seq = 0;
3067         out_hdr->sadb_msg_pid = 0;
3068
3069         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3070                         xs_net(x));
3071         return 0;
3072 }
3073
3074 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3075 {
3076         struct net *net = x ? xs_net(x) : c->net;
3077         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3078
3079         if (atomic_read(&net_pfkey->socks_nr) == 0)
3080                 return 0;
3081
3082         switch (c->event) {
3083         case XFRM_MSG_EXPIRE:
3084                 return key_notify_sa_expire(x, c);
3085         case XFRM_MSG_DELSA:
3086         case XFRM_MSG_NEWSA:
3087         case XFRM_MSG_UPDSA:
3088                 return key_notify_sa(x, c);
3089         case XFRM_MSG_FLUSHSA:
3090                 return key_notify_sa_flush(c);
3091         case XFRM_MSG_NEWAE: /* not yet supported */
3092                 break;
3093         default:
3094                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3095                 break;
3096         }
3097
3098         return 0;
3099 }
3100
3101 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3102 {
3103         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3104                 return 0;
3105
3106         switch (c->event) {
3107         case XFRM_MSG_POLEXPIRE:
3108                 return key_notify_policy_expire(xp, c);
3109         case XFRM_MSG_DELPOLICY:
3110         case XFRM_MSG_NEWPOLICY:
3111         case XFRM_MSG_UPDPOLICY:
3112                 return key_notify_policy(xp, dir, c);
3113         case XFRM_MSG_FLUSHPOLICY:
3114                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3115                         break;
3116                 return key_notify_policy_flush(c);
3117         default:
3118                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3119                 break;
3120         }
3121
3122         return 0;
3123 }
3124
3125 static u32 get_acqseq(void)
3126 {
3127         u32 res;
3128         static atomic_t acqseq;
3129
3130         do {
3131                 res = atomic_inc_return(&acqseq);
3132         } while (!res);
3133         return res;
3134 }
3135
3136 static bool pfkey_is_alive(const struct km_event *c)
3137 {
3138         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3139         struct sock *sk;
3140         bool is_alive = false;
3141
3142         rcu_read_lock();
3143         sk_for_each_rcu(sk, &net_pfkey->table) {
3144                 if (pfkey_sk(sk)->registered) {
3145                         is_alive = true;
3146                         break;
3147                 }
3148         }
3149         rcu_read_unlock();
3150
3151         return is_alive;
3152 }
3153
3154 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3155 {
3156         struct sk_buff *skb;
3157         struct sadb_msg *hdr;
3158         struct sadb_address *addr;
3159         struct sadb_x_policy *pol;
3160         int sockaddr_size;
3161         int size;
3162         struct sadb_x_sec_ctx *sec_ctx;
3163         struct xfrm_sec_ctx *xfrm_ctx;
3164         int ctx_size = 0;
3165
3166         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3167         if (!sockaddr_size)
3168                 return -EINVAL;
3169
3170         size = sizeof(struct sadb_msg) +
3171                 (sizeof(struct sadb_address) * 2) +
3172                 (sockaddr_size * 2) +
3173                 sizeof(struct sadb_x_policy);
3174
3175         if (x->id.proto == IPPROTO_AH)
3176                 size += count_ah_combs(t);
3177         else if (x->id.proto == IPPROTO_ESP)
3178                 size += count_esp_combs(t);
3179
3180         if ((xfrm_ctx = x->security)) {
3181                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3182                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3183         }
3184
3185         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3186         if (skb == NULL)
3187                 return -ENOMEM;
3188
3189         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3190         hdr->sadb_msg_version = PF_KEY_V2;
3191         hdr->sadb_msg_type = SADB_ACQUIRE;
3192         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3193         hdr->sadb_msg_len = size / sizeof(uint64_t);
3194         hdr->sadb_msg_errno = 0;
3195         hdr->sadb_msg_reserved = 0;
3196         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3197         hdr->sadb_msg_pid = 0;
3198
3199         /* src address */
3200         addr = (struct sadb_address*) skb_put(skb,
3201                                               sizeof(struct sadb_address)+sockaddr_size);
3202         addr->sadb_address_len =
3203                 (sizeof(struct sadb_address)+sockaddr_size)/
3204                         sizeof(uint64_t);
3205         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3206         addr->sadb_address_proto = 0;
3207         addr->sadb_address_reserved = 0;
3208         addr->sadb_address_prefixlen =
3209                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3210                                     (struct sockaddr *) (addr + 1),
3211                                     x->props.family);
3212         if (!addr->sadb_address_prefixlen)
3213                 BUG();
3214
3215         /* dst address */
3216         addr = (struct sadb_address*) skb_put(skb,
3217                                               sizeof(struct sadb_address)+sockaddr_size);
3218         addr->sadb_address_len =
3219                 (sizeof(struct sadb_address)+sockaddr_size)/
3220                         sizeof(uint64_t);
3221         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3222         addr->sadb_address_proto = 0;
3223         addr->sadb_address_reserved = 0;
3224         addr->sadb_address_prefixlen =
3225                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3226                                     (struct sockaddr *) (addr + 1),
3227                                     x->props.family);
3228         if (!addr->sadb_address_prefixlen)
3229                 BUG();
3230
3231         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3232         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3233         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3234         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3235         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3236         pol->sadb_x_policy_reserved = 0;
3237         pol->sadb_x_policy_id = xp->index;
3238         pol->sadb_x_policy_priority = xp->priority;
3239
3240         /* Set sadb_comb's. */
3241         if (x->id.proto == IPPROTO_AH)
3242                 dump_ah_combs(skb, t);
3243         else if (x->id.proto == IPPROTO_ESP)
3244                 dump_esp_combs(skb, t);
3245
3246         /* security context */
3247         if (xfrm_ctx) {
3248                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3249                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3250                 sec_ctx->sadb_x_sec_len =
3251                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3252                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3253                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3254                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3255                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3256                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3257                        xfrm_ctx->ctx_len);
3258         }
3259
3260         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3261                                xs_net(x));
3262 }
3263
3264 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3265                                                 u8 *data, int len, int *dir)
3266 {
3267         struct net *net = sock_net(sk);
3268         struct xfrm_policy *xp;
3269         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3270         struct sadb_x_sec_ctx *sec_ctx;
3271
3272         switch (sk->sk_family) {
3273         case AF_INET:
3274                 if (opt != IP_IPSEC_POLICY) {
3275                         *dir = -EOPNOTSUPP;
3276                         return NULL;
3277                 }
3278                 break;
3279 #if IS_ENABLED(CONFIG_IPV6)
3280         case AF_INET6:
3281                 if (opt != IPV6_IPSEC_POLICY) {
3282                         *dir = -EOPNOTSUPP;
3283                         return NULL;
3284                 }
3285                 break;
3286 #endif
3287         default:
3288                 *dir = -EINVAL;
3289                 return NULL;
3290         }
3291
3292         *dir = -EINVAL;
3293
3294         if (len < sizeof(struct sadb_x_policy) ||
3295             pol->sadb_x_policy_len*8 > len ||
3296             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3297             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3298                 return NULL;
3299
3300         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3301         if (xp == NULL) {
3302                 *dir = -ENOBUFS;
3303                 return NULL;
3304         }
3305
3306         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3307                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3308
3309         xp->lft.soft_byte_limit = XFRM_INF;
3310         xp->lft.hard_byte_limit = XFRM_INF;
3311         xp->lft.soft_packet_limit = XFRM_INF;
3312         xp->lft.hard_packet_limit = XFRM_INF;
3313         xp->family = sk->sk_family;
3314
3315         xp->xfrm_nr = 0;
3316         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3317             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3318                 goto out;
3319
3320         /* security context too */
3321         if (len >= (pol->sadb_x_policy_len*8 +
3322             sizeof(struct sadb_x_sec_ctx))) {
3323                 char *p = (char *)pol;
3324                 struct xfrm_user_sec_ctx *uctx;
3325
3326                 p += pol->sadb_x_policy_len*8;
3327                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3328                 if (len < pol->sadb_x_policy_len*8 +
3329                     sec_ctx->sadb_x_sec_len*8) {
3330                         *dir = -EINVAL;
3331                         goto out;
3332                 }
3333                 if ((*dir = verify_sec_ctx_len(p)))
3334                         goto out;
3335                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3336                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3337                 kfree(uctx);
3338
3339                 if (*dir)
3340                         goto out;
3341         }
3342
3343         *dir = pol->sadb_x_policy_dir-1;
3344         return xp;
3345
3346 out:
3347         xp->walk.dead = 1;
3348         xfrm_policy_destroy(xp);
3349         return NULL;
3350 }
3351
3352 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3353 {
3354         struct sk_buff *skb;
3355         struct sadb_msg *hdr;
3356         struct sadb_sa *sa;
3357         struct sadb_address *addr;
3358         struct sadb_x_nat_t_port *n_port;
3359         int sockaddr_size;
3360         int size;
3361         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3362         struct xfrm_encap_tmpl *natt = NULL;
3363
3364         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3365         if (!sockaddr_size)
3366                 return -EINVAL;
3367
3368         if (!satype)
3369                 return -EINVAL;
3370
3371         if (!x->encap)
3372                 return -EINVAL;
3373
3374         natt = x->encap;
3375
3376         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3377          *
3378          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3379          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3380          */
3381
3382         size = sizeof(struct sadb_msg) +
3383                 sizeof(struct sadb_sa) +
3384                 (sizeof(struct sadb_address) * 2) +
3385                 (sockaddr_size * 2) +
3386                 (sizeof(struct sadb_x_nat_t_port) * 2);
3387
3388         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3389         if (skb == NULL)
3390                 return -ENOMEM;
3391
3392         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3393         hdr->sadb_msg_version = PF_KEY_V2;
3394         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3395         hdr->sadb_msg_satype = satype;
3396         hdr->sadb_msg_len = size / sizeof(uint64_t);
3397         hdr->sadb_msg_errno = 0;
3398         hdr->sadb_msg_reserved = 0;
3399         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3400         hdr->sadb_msg_pid = 0;
3401
3402         /* SA */
3403         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3404         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3405         sa->sadb_sa_exttype = SADB_EXT_SA;
3406         sa->sadb_sa_spi = x->id.spi;
3407         sa->sadb_sa_replay = 0;
3408         sa->sadb_sa_state = 0;
3409         sa->sadb_sa_auth = 0;
3410         sa->sadb_sa_encrypt = 0;
3411         sa->sadb_sa_flags = 0;
3412
3413         /* ADDRESS_SRC (old addr) */
3414         addr = (struct sadb_address*)
3415                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3416         addr->sadb_address_len =
3417                 (sizeof(struct sadb_address)+sockaddr_size)/
3418                         sizeof(uint64_t);
3419         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3420         addr->sadb_address_proto = 0;
3421         addr->sadb_address_reserved = 0;
3422         addr->sadb_address_prefixlen =
3423                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3424                                     (struct sockaddr *) (addr + 1),
3425                                     x->props.family);
3426         if (!addr->sadb_address_prefixlen)
3427                 BUG();
3428
3429         /* NAT_T_SPORT (old port) */
3430         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3431         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3432         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3433         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3434         n_port->sadb_x_nat_t_port_reserved = 0;
3435
3436         /* ADDRESS_DST (new addr) */
3437         addr = (struct sadb_address*)
3438                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3439         addr->sadb_address_len =
3440                 (sizeof(struct sadb_address)+sockaddr_size)/
3441                         sizeof(uint64_t);
3442         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3443         addr->sadb_address_proto = 0;
3444         addr->sadb_address_reserved = 0;
3445         addr->sadb_address_prefixlen =
3446                 pfkey_sockaddr_fill(ipaddr, 0,
3447                                     (struct sockaddr *) (addr + 1),
3448                                     x->props.family);
3449         if (!addr->sadb_address_prefixlen)
3450                 BUG();
3451
3452         /* NAT_T_DPORT (new port) */
3453         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3454         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3455         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3456         n_port->sadb_x_nat_t_port_port = sport;
3457         n_port->sadb_x_nat_t_port_reserved = 0;
3458
3459         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3460                                xs_net(x));
3461 }
3462
3463 #ifdef CONFIG_NET_KEY_MIGRATE
3464 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3465                             const struct xfrm_selector *sel)
3466 {
3467         struct sadb_address *addr;
3468         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3469         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3470         addr->sadb_address_exttype = type;
3471         addr->sadb_address_proto = sel->proto;
3472         addr->sadb_address_reserved = 0;
3473
3474         switch (type) {
3475         case SADB_EXT_ADDRESS_SRC:
3476                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3477                 pfkey_sockaddr_fill(&sel->saddr, 0,
3478                                     (struct sockaddr *)(addr + 1),
3479                                     sel->family);
3480                 break;
3481         case SADB_EXT_ADDRESS_DST:
3482                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3483                 pfkey_sockaddr_fill(&sel->daddr, 0,
3484                                     (struct sockaddr *)(addr + 1),
3485                                     sel->family);
3486                 break;
3487         default:
3488                 return -EINVAL;
3489         }
3490
3491         return 0;
3492 }
3493
3494
3495 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3496 {
3497         struct sadb_x_kmaddress *kma;
3498         u8 *sa;
3499         int family = k->family;
3500         int socklen = pfkey_sockaddr_len(family);
3501         int size_req;
3502
3503         size_req = (sizeof(struct sadb_x_kmaddress) +
3504                     pfkey_sockaddr_pair_size(family));
3505
3506         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3507         memset(kma, 0, size_req);
3508         kma->sadb_x_kmaddress_len = size_req / 8;
3509         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3510         kma->sadb_x_kmaddress_reserved = k->reserved;
3511
3512         sa = (u8 *)(kma + 1);
3513         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3514             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3515                 return -EINVAL;
3516
3517         return 0;
3518 }
3519
3520 static int set_ipsecrequest(struct sk_buff *skb,
3521                             uint8_t proto, uint8_t mode, int level,
3522                             uint32_t reqid, uint8_t family,
3523                             const xfrm_address_t *src, const xfrm_address_t *dst)
3524 {
3525         struct sadb_x_ipsecrequest *rq;
3526         u8 *sa;
3527         int socklen = pfkey_sockaddr_len(family);
3528         int size_req;
3529
3530         size_req = sizeof(struct sadb_x_ipsecrequest) +
3531                    pfkey_sockaddr_pair_size(family);
3532
3533         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3534         memset(rq, 0, size_req);
3535         rq->sadb_x_ipsecrequest_len = size_req;
3536         rq->sadb_x_ipsecrequest_proto = proto;
3537         rq->sadb_x_ipsecrequest_mode = mode;
3538         rq->sadb_x_ipsecrequest_level = level;
3539         rq->sadb_x_ipsecrequest_reqid = reqid;
3540
3541         sa = (u8 *) (rq + 1);
3542         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3543             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3544                 return -EINVAL;
3545
3546         return 0;
3547 }
3548 #endif
3549
3550 #ifdef CONFIG_NET_KEY_MIGRATE
3551 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3552                               const struct xfrm_migrate *m, int num_bundles,
3553                               const struct xfrm_kmaddress *k)
3554 {
3555         int i;
3556         int sasize_sel;
3557         int size = 0;
3558         int size_pol = 0;
3559         struct sk_buff *skb;
3560         struct sadb_msg *hdr;
3561         struct sadb_x_policy *pol;
3562         const struct xfrm_migrate *mp;
3563
3564         if (type != XFRM_POLICY_TYPE_MAIN)
3565                 return 0;
3566
3567         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3568                 return -EINVAL;
3569
3570         if (k != NULL) {
3571                 /* addresses for KM */
3572                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3573                                      pfkey_sockaddr_pair_size(k->family));
3574         }
3575
3576         /* selector */
3577         sasize_sel = pfkey_sockaddr_size(sel->family);
3578         if (!sasize_sel)
3579                 return -EINVAL;
3580         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3581
3582         /* policy info */
3583         size_pol += sizeof(struct sadb_x_policy);
3584
3585         /* ipsecrequests */
3586         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3587                 /* old locator pair */
3588                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3589                             pfkey_sockaddr_pair_size(mp->old_family);
3590                 /* new locator pair */
3591                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3592                             pfkey_sockaddr_pair_size(mp->new_family);
3593         }
3594
3595         size += sizeof(struct sadb_msg) + size_pol;
3596
3597         /* alloc buffer */
3598         skb = alloc_skb(size, GFP_ATOMIC);
3599         if (skb == NULL)
3600                 return -ENOMEM;
3601
3602         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3603         hdr->sadb_msg_version = PF_KEY_V2;
3604         hdr->sadb_msg_type = SADB_X_MIGRATE;
3605         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3606         hdr->sadb_msg_len = size / 8;
3607         hdr->sadb_msg_errno = 0;
3608         hdr->sadb_msg_reserved = 0;
3609         hdr->sadb_msg_seq = 0;
3610         hdr->sadb_msg_pid = 0;
3611
3612         /* Addresses to be used by KM for negotiation, if ext is available */
3613         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3614                 goto err;
3615
3616         /* selector src */
3617         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3618
3619         /* selector dst */
3620         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3621
3622         /* policy information */
3623         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3624         pol->sadb_x_policy_len = size_pol / 8;
3625         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3626         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3627         pol->sadb_x_policy_dir = dir + 1;
3628         pol->sadb_x_policy_reserved = 0;
3629         pol->sadb_x_policy_id = 0;
3630         pol->sadb_x_policy_priority = 0;
3631
3632         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3633                 /* old ipsecrequest */
3634                 int mode = pfkey_mode_from_xfrm(mp->mode);
3635                 if (mode < 0)
3636                         goto err;
3637                 if (set_ipsecrequest(skb, mp->proto, mode,
3638                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3639                                      mp->reqid, mp->old_family,
3640                                      &mp->old_saddr, &mp->old_daddr) < 0)
3641                         goto err;
3642
3643                 /* new ipsecrequest */
3644                 if (set_ipsecrequest(skb, mp->proto, mode,
3645                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3646                                      mp->reqid, mp->new_family,
3647                                      &mp->new_saddr, &mp->new_daddr) < 0)
3648                         goto err;
3649         }
3650
3651         /* broadcast migrate message to sockets */
3652         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3653
3654         return 0;
3655
3656 err:
3657         kfree_skb(skb);
3658         return -EINVAL;
3659 }
3660 #else
3661 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3662                               const struct xfrm_migrate *m, int num_bundles,
3663                               const struct xfrm_kmaddress *k)
3664 {
3665         return -ENOPROTOOPT;
3666 }
3667 #endif
3668
3669 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3670 {
3671         struct sock *sk = sock->sk;
3672         struct sk_buff *skb = NULL;
3673         struct sadb_msg *hdr = NULL;
3674         int err;
3675         struct net *net = sock_net(sk);
3676
3677         err = -EOPNOTSUPP;
3678         if (msg->msg_flags & MSG_OOB)
3679                 goto out;
3680
3681         err = -EMSGSIZE;
3682         if ((unsigned int)len > sk->sk_sndbuf - 32)
3683                 goto out;
3684
3685         err = -ENOBUFS;
3686         skb = alloc_skb(len, GFP_KERNEL);
3687         if (skb == NULL)
3688                 goto out;
3689
3690         err = -EFAULT;
3691         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3692                 goto out;
3693
3694         hdr = pfkey_get_base_msg(skb, &err);
3695         if (!hdr)
3696                 goto out;
3697
3698         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3699         err = pfkey_process(sk, skb, hdr);
3700         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3701
3702 out:
3703         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3704                 err = 0;
3705         kfree_skb(skb);
3706
3707         return err ? : len;
3708 }
3709
3710 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3711                          int flags)
3712 {
3713         struct sock *sk = sock->sk;
3714         struct pfkey_sock *pfk = pfkey_sk(sk);
3715         struct sk_buff *skb;
3716         int copied, err;
3717
3718         err = -EINVAL;
3719         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3720                 goto out;
3721
3722         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3723         if (skb == NULL)
3724                 goto out;
3725
3726         copied = skb->len;
3727         if (copied > len) {
3728                 msg->msg_flags |= MSG_TRUNC;
3729                 copied = len;
3730         }
3731
3732         skb_reset_transport_header(skb);
3733         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3734         if (err)
3735                 goto out_free;
3736
3737         sock_recv_ts_and_drops(msg, sk, skb);
3738
3739         err = (flags & MSG_TRUNC) ? skb->len : copied;
3740
3741         if (pfk->dump.dump != NULL &&
3742             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3743                 pfkey_do_dump(pfk);
3744
3745 out_free:
3746         skb_free_datagram(sk, skb);
3747 out:
3748         return err;
3749 }
3750
3751 static const struct proto_ops pfkey_ops = {
3752         .family         =       PF_KEY,
3753         .owner          =       THIS_MODULE,
3754         /* Operations that make no sense on pfkey sockets. */
3755         .bind           =       sock_no_bind,
3756         .connect        =       sock_no_connect,
3757         .socketpair     =       sock_no_socketpair,
3758         .accept         =       sock_no_accept,
3759         .getname        =       sock_no_getname,
3760         .ioctl          =       sock_no_ioctl,
3761         .listen         =       sock_no_listen,
3762         .shutdown       =       sock_no_shutdown,
3763         .setsockopt     =       sock_no_setsockopt,
3764         .getsockopt     =       sock_no_getsockopt,
3765         .mmap           =       sock_no_mmap,
3766         .sendpage       =       sock_no_sendpage,
3767
3768         /* Now the operations that really occur. */
3769         .release        =       pfkey_release,
3770         .poll           =       datagram_poll,
3771         .sendmsg        =       pfkey_sendmsg,
3772         .recvmsg        =       pfkey_recvmsg,
3773 };
3774
3775 static const struct net_proto_family pfkey_family_ops = {
3776         .family =       PF_KEY,
3777         .create =       pfkey_create,
3778         .owner  =       THIS_MODULE,
3779 };
3780
3781 #ifdef CONFIG_PROC_FS
3782 static int pfkey_seq_show(struct seq_file *f, void *v)
3783 {
3784         struct sock *s = sk_entry(v);
3785
3786         if (v == SEQ_START_TOKEN)
3787                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3788         else
3789                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3790                                s,
3791                                atomic_read(&s->sk_refcnt),
3792                                sk_rmem_alloc_get(s),
3793                                sk_wmem_alloc_get(s),
3794                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3795                                sock_i_ino(s)
3796                                );
3797         return 0;
3798 }
3799
3800 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3801         __acquires(rcu)
3802 {
3803         struct net *net = seq_file_net(f);
3804         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3805
3806         rcu_read_lock();
3807         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3808 }
3809
3810 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3811 {
3812         struct net *net = seq_file_net(f);
3813         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3814
3815         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3816 }
3817
3818 static void pfkey_seq_stop(struct seq_file *f, void *v)
3819         __releases(rcu)
3820 {
3821         rcu_read_unlock();
3822 }
3823
3824 static const struct seq_operations pfkey_seq_ops = {
3825         .start  = pfkey_seq_start,
3826         .next   = pfkey_seq_next,
3827         .stop   = pfkey_seq_stop,
3828         .show   = pfkey_seq_show,
3829 };
3830
3831 static int pfkey_seq_open(struct inode *inode, struct file *file)
3832 {
3833         return seq_open_net(inode, file, &pfkey_seq_ops,
3834                             sizeof(struct seq_net_private));
3835 }
3836
3837 static const struct file_operations pfkey_proc_ops = {
3838         .open    = pfkey_seq_open,
3839         .read    = seq_read,
3840         .llseek  = seq_lseek,
3841         .release = seq_release_net,
3842 };
3843
3844 static int __net_init pfkey_init_proc(struct net *net)
3845 {
3846         struct proc_dir_entry *e;
3847
3848         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3849         if (e == NULL)
3850                 return -ENOMEM;
3851
3852         return 0;
3853 }
3854
3855 static void __net_exit pfkey_exit_proc(struct net *net)
3856 {
3857         remove_proc_entry("pfkey", net->proc_net);
3858 }
3859 #else
3860 static inline int pfkey_init_proc(struct net *net)
3861 {
3862         return 0;
3863 }
3864
3865 static inline void pfkey_exit_proc(struct net *net)
3866 {
3867 }
3868 #endif
3869
3870 static struct xfrm_mgr pfkeyv2_mgr =
3871 {
3872         .id             = "pfkeyv2",
3873         .notify         = pfkey_send_notify,
3874         .acquire        = pfkey_send_acquire,
3875         .compile_policy = pfkey_compile_policy,
3876         .new_mapping    = pfkey_send_new_mapping,
3877         .notify_policy  = pfkey_send_policy_notify,
3878         .migrate        = pfkey_send_migrate,
3879         .is_alive       = pfkey_is_alive,
3880 };
3881
3882 static int __net_init pfkey_net_init(struct net *net)
3883 {
3884         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3885         int rv;
3886
3887         INIT_HLIST_HEAD(&net_pfkey->table);
3888         atomic_set(&net_pfkey->socks_nr, 0);
3889
3890         rv = pfkey_init_proc(net);
3891
3892         return rv;
3893 }
3894
3895 static void __net_exit pfkey_net_exit(struct net *net)
3896 {
3897         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3898
3899         pfkey_exit_proc(net);
3900         BUG_ON(!hlist_empty(&net_pfkey->table));
3901 }
3902
3903 static struct pernet_operations pfkey_net_ops = {
3904         .init = pfkey_net_init,
3905         .exit = pfkey_net_exit,
3906         .id   = &pfkey_net_id,
3907         .size = sizeof(struct netns_pfkey),
3908 };
3909
3910 static void __exit ipsec_pfkey_exit(void)
3911 {
3912         xfrm_unregister_km(&pfkeyv2_mgr);
3913         sock_unregister(PF_KEY);
3914         unregister_pernet_subsys(&pfkey_net_ops);
3915         proto_unregister(&key_proto);
3916 }
3917
3918 static int __init ipsec_pfkey_init(void)
3919 {
3920         int err = proto_register(&key_proto, 0);
3921
3922         if (err != 0)
3923                 goto out;
3924
3925         err = register_pernet_subsys(&pfkey_net_ops);
3926         if (err != 0)
3927                 goto out_unregister_key_proto;
3928         err = sock_register(&pfkey_family_ops);
3929         if (err != 0)
3930                 goto out_unregister_pernet;
3931         err = xfrm_register_km(&pfkeyv2_mgr);
3932         if (err != 0)
3933                 goto out_sock_unregister;
3934 out:
3935         return err;
3936
3937 out_sock_unregister:
3938         sock_unregister(PF_KEY);
3939 out_unregister_pernet:
3940         unregister_pernet_subsys(&pfkey_net_ops);
3941 out_unregister_key_proto:
3942         proto_unregister(&key_proto);
3943         goto out;
3944 }
3945
3946 module_init(ipsec_pfkey_init);
3947 module_exit(ipsec_pfkey_exit);
3948 MODULE_LICENSE("GPL");
3949 MODULE_ALIAS_NETPROTO(PF_KEY);