net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static unsigned int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static const struct xfrm_mark dummy_mark = {0, 0};
  49 struct pfkey_sock {
  50         /* struct sock must be the first member of struct pfkey_sock */
  51         struct sock     sk;
  52         int             registered;
  53         int             promisc;
  54
  55         struct {
  56                 uint8_t         msg_version;
  57                 uint32_t        msg_portid;
  58                 int             (*dump)(struct pfkey_sock *sk);
  59                 void            (*done)(struct pfkey_sock *sk);
  60                 union {
  61                         struct xfrm_policy_walk policy;
  62                         struct xfrm_state_walk  state;
  63                 } u;
  64                 struct sk_buff  *skb;
  65         } dump;
  66         struct mutex dump_lock;
  67 };
  68
  69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  70                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  71                                u16 *family);
  72
  73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  74 {
  75         return (struct pfkey_sock *)sk;
  76 }
  77
  78 static int pfkey_can_dump(const struct sock *sk)
  79 {
  80         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  81                 return 1;
  82         return 0;
  83 }
  84
  85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  86 {
  87         if (pfk->dump.dump) {
  88                 if (pfk->dump.skb) {
  89                         kfree_skb(pfk->dump.skb);
  90                         pfk->dump.skb = NULL;
  91                 }
  92                 pfk->dump.done(pfk);
  93                 pfk->dump.dump = NULL;
  94                 pfk->dump.done = NULL;
  95         }
  96 }
  97
  98 static void pfkey_sock_destruct(struct sock *sk)
  99 {
 100         struct net *net = sock_net(sk);
 101         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 102
 103         pfkey_terminate_dump(pfkey_sk(sk));
 104         skb_queue_purge(&sk->sk_receive_queue);
 105
 106         if (!sock_flag(sk, SOCK_DEAD)) {
 107                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 108                 return;
 109         }
 110
 111         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 112         WARN_ON(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, struct sk_buff **skb2,
 200                                gfp_t allocation, struct sock *sk)
 201 {
 202         int err = -ENOBUFS;
 203
 204         sock_hold(sk);
 205         if (*skb2 == NULL) {
 206                 if (atomic_read(&skb->users) != 1) {
 207                         *skb2 = skb_clone(skb, allocation);
 208                 } else {
 209                         *skb2 = skb;
 210                         atomic_inc(&skb->users);
 211                 }
 212         }
 213         if (*skb2 != NULL) {
 214                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 215                         skb_set_owner_r(*skb2, sk);
 216                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 217                         sk->sk_data_ready(sk);
 218                         *skb2 = NULL;
 219                         err = 0;
 220                 }
 221         }
 222         sock_put(sk);
 223         return err;
 224 }
 225
 226 /* Send SKB to all pfkey sockets matching selected criteria.  */
 227 #define BROADCAST_ALL           0
 228 #define BROADCAST_ONE           1
 229 #define BROADCAST_REGISTERED    2
 230 #define BROADCAST_PROMISC_ONLY  4
 231 static int pfkey_broadcast(struct sk_buff *skb,
 232                            int broadcast_flags, struct sock *one_sk,
 233                            struct net *net)
 234 {
 235         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 236         struct sock *sk;
 237         struct sk_buff *skb2 = NULL;
 238         int err = -ESRCH;
 239
 240         /* XXX Do we need something like netlink_overrun?  I think
 241          * XXX PF_KEY socket apps will not mind current behavior.
 242          */
 243         if (!skb)
 244                 return -ENOMEM;
 245
 246         rcu_read_lock();
 247         sk_for_each_rcu(sk, &net_pfkey->table) {
 248                 struct pfkey_sock *pfk = pfkey_sk(sk);
 249                 int err2;
 250
 251                 /* Yes, it means that if you are meant to receive this
 252                  * pfkey message you receive it twice as promiscuous
 253                  * socket.
 254                  */
 255                 if (pfk->promisc)
 256                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 257
 258                 /* the exact target will be processed later */
 259                 if (sk == one_sk)
 260                         continue;
 261                 if (broadcast_flags != BROADCAST_ALL) {
 262                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 263                                 continue;
 264                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 265                             !pfk->registered)
 266                                 continue;
 267                         if (broadcast_flags & BROADCAST_ONE)
 268                                 continue;
 269                 }
 270
 271                 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 272
 273                 /* Error is cleared after successful sending to at least one
 274                  * registered KM */
 275                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 276                         err = err2;
 277         }
 278         rcu_read_unlock();
 279
 280         if (one_sk != NULL)
 281                 err = pfkey_broadcast_one(skb, &skb2, GFP_KERNEL, one_sk);
 282
 283         kfree_skb(skb2);
 284         kfree_skb(skb);
 285         return err;
 286 }
 287
 288 static int pfkey_do_dump(struct pfkey_sock *pfk)
 289 {
 290         struct sadb_msg *hdr;
 291         int rc;
 292
 293         mutex_lock(&pfk->dump_lock);
 294         if (!pfk->dump.dump) {
 295                 rc = 0;
 296                 goto out;
 297         }
 298
 299         rc = pfk->dump.dump(pfk);
 300         if (rc == -ENOBUFS) {
 301                 rc = 0;
 302                 goto out;
 303         }
 304
 305         if (pfk->dump.skb) {
 306                 if (!pfkey_can_dump(&pfk->sk)) {
 307                         rc = 0;
 308                         goto out;
 309                 }
 310
 311                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 312                 hdr->sadb_msg_seq = 0;
 313                 hdr->sadb_msg_errno = rc;
 314                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
 315                                 &pfk->sk, sock_net(&pfk->sk));
 316                 pfk->dump.skb = NULL;
 317         }
 318
 319         pfkey_terminate_dump(pfk);
 320
 321 out:
 322         mutex_unlock(&pfk->dump_lock);
 323         return rc;
 324 }
 325
 326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 327                                  const struct sadb_msg *orig)
 328 {
 329         *new = *orig;
 330 }
 331
 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 333 {
 334         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 335         struct sadb_msg *hdr;
 336
 337         if (!skb)
 338                 return -ENOBUFS;
 339
 340         /* Woe be to the platform trying to support PFKEY yet
 341          * having normal errnos outside the 1-255 range, inclusive.
 342          */
 343         err = -err;
 344         if (err == ERESTARTSYS ||
 345             err == ERESTARTNOHAND ||
 346             err == ERESTARTNOINTR)
 347                 err = EINTR;
 348         if (err >= 512)
 349                 err = EINVAL;
 350         BUG_ON(err <= 0 || err >= 256);
 351
 352         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 353         pfkey_hdr_dup(hdr, orig);
 354         hdr->sadb_msg_errno = (uint8_t) err;
 355         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 356                              sizeof(uint64_t));
 357
 358         pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
 359
 360         return 0;
 361 }
 362
 363 static const u8 sadb_ext_min_len[] = {
 364         [SADB_EXT_RESERVED]             = (u8) 0,
 365         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 366         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 367         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 368         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 369         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 370         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 371         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 372         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 373         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 374         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 375         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 376         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 377         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 378         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 379         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 380         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 381         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 382         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 383         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 384         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 385         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 386         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 387         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 388         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 389         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 390         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 391 };
 392
 393 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 394 static int verify_address_len(const void *p)
 395 {
 396         const struct sadb_address *sp = p;
 397         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 398         const struct sockaddr_in *sin;
 399 #if IS_ENABLED(CONFIG_IPV6)
 400         const struct sockaddr_in6 *sin6;
 401 #endif
 402         int len;
 403
 404         switch (addr->sa_family) {
 405         case AF_INET:
 406                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 407                 if (sp->sadb_address_len != len ||
 408                     sp->sadb_address_prefixlen > 32)
 409                         return -EINVAL;
 410                 break;
 411 #if IS_ENABLED(CONFIG_IPV6)
 412         case AF_INET6:
 413                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 414                 if (sp->sadb_address_len != len ||
 415                     sp->sadb_address_prefixlen > 128)
 416                         return -EINVAL;
 417                 break;
 418 #endif
 419         default:
 420                 /* It is user using kernel to keep track of security
 421                  * associations for another protocol, such as
 422                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 423                  * lengths.
 424                  *
 425                  * XXX Actually, association/policy database is not yet
 426                  * XXX able to cope with arbitrary sockaddr families.
 427                  * XXX When it can, remove this -EINVAL.  -DaveM
 428                  */
 429                 return -EINVAL;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 436 {
 437         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 438                             sec_ctx->sadb_x_ctx_len,
 439                             sizeof(uint64_t));
 440 }
 441
 442 static inline int verify_sec_ctx_len(const void *p)
 443 {
 444         const struct sadb_x_sec_ctx *sec_ctx = p;
 445         int len = sec_ctx->sadb_x_ctx_len;
 446
 447         if (len > PAGE_SIZE)
 448                 return -EINVAL;
 449
 450         len = pfkey_sec_ctx_len(sec_ctx);
 451
 452         if (sec_ctx->sadb_x_sec_len != len)
 453                 return -EINVAL;
 454
 455         return 0;
 456 }
 457
 458 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 459                                                                      gfp_t gfp)
 460 {
 461         struct xfrm_user_sec_ctx *uctx = NULL;
 462         int ctx_size = sec_ctx->sadb_x_ctx_len;
 463
 464         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 465
 466         if (!uctx)
 467                 return NULL;
 468
 469         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 470         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 471         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 472         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 473         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 474         memcpy(uctx + 1, sec_ctx + 1,
 475                uctx->ctx_len);
 476
 477         return uctx;
 478 }
 479
 480 static int present_and_same_family(const struct sadb_address *src,
 481                                    const struct sadb_address *dst)
 482 {
 483         const struct sockaddr *s_addr, *d_addr;
 484
 485         if (!src || !dst)
 486                 return 0;
 487
 488         s_addr = (const struct sockaddr *)(src + 1);
 489         d_addr = (const struct sockaddr *)(dst + 1);
 490         if (s_addr->sa_family != d_addr->sa_family)
 491                 return 0;
 492         if (s_addr->sa_family != AF_INET
 493 #if IS_ENABLED(CONFIG_IPV6)
 494             && s_addr->sa_family != AF_INET6
 495 #endif
 496                 )
 497                 return 0;
 498
 499         return 1;
 500 }
 501
 502 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 503 {
 504         const char *p = (char *) hdr;
 505         int len = skb->len;
 506
 507         len -= sizeof(*hdr);
 508         p += sizeof(*hdr);
 509         while (len > 0) {
 510                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 511                 uint16_t ext_type;
 512                 int ext_len;
 513
 514                 ext_len  = ehdr->sadb_ext_len;
 515                 ext_len *= sizeof(uint64_t);
 516                 ext_type = ehdr->sadb_ext_type;
 517                 if (ext_len < sizeof(uint64_t) ||
 518                     ext_len > len ||
 519                     ext_type == SADB_EXT_RESERVED)
 520                         return -EINVAL;
 521
 522                 if (ext_type <= SADB_EXT_MAX) {
 523                         int min = (int) sadb_ext_min_len[ext_type];
 524                         if (ext_len < min)
 525                                 return -EINVAL;
 526                         if (ext_hdrs[ext_type-1] != NULL)
 527                                 return -EINVAL;
 528                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 529                             ext_type == SADB_EXT_ADDRESS_DST ||
 530                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 531                             ext_type == SADB_X_EXT_NAT_T_OA) {
 532                                 if (verify_address_len(p))
 533                                         return -EINVAL;
 534                         }
 535                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 536                                 if (verify_sec_ctx_len(p))
 537                                         return -EINVAL;
 538                         }
 539                         ext_hdrs[ext_type-1] = (void *) p;
 540                 }
 541                 p   += ext_len;
 542                 len -= ext_len;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static uint16_t
 549 pfkey_satype2proto(uint8_t satype)
 550 {
 551         switch (satype) {
 552         case SADB_SATYPE_UNSPEC:
 553                 return IPSEC_PROTO_ANY;
 554         case SADB_SATYPE_AH:
 555                 return IPPROTO_AH;
 556         case SADB_SATYPE_ESP:
 557                 return IPPROTO_ESP;
 558         case SADB_X_SATYPE_IPCOMP:
 559                 return IPPROTO_COMP;
 560         default:
 561                 return 0;
 562         }
 563         /* NOTREACHED */
 564 }
 565
 566 static uint8_t
 567 pfkey_proto2satype(uint16_t proto)
 568 {
 569         switch (proto) {
 570         case IPPROTO_AH:
 571                 return SADB_SATYPE_AH;
 572         case IPPROTO_ESP:
 573                 return SADB_SATYPE_ESP;
 574         case IPPROTO_COMP:
 575                 return SADB_X_SATYPE_IPCOMP;
 576         default:
 577                 return 0;
 578         }
 579         /* NOTREACHED */
 580 }
 581
 582 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 583  * say specifically 'just raw sockets' as we encode them as 255.
 584  */
 585
 586 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 587 {
 588         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 589 }
 590
 591 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 592 {
 593         return proto ? proto : IPSEC_PROTO_ANY;
 594 }
 595
 596 static inline int pfkey_sockaddr_len(sa_family_t family)
 597 {
 598         switch (family) {
 599         case AF_INET:
 600                 return sizeof(struct sockaddr_in);
 601 #if IS_ENABLED(CONFIG_IPV6)
 602         case AF_INET6:
 603                 return sizeof(struct sockaddr_in6);
 604 #endif
 605         }
 606         return 0;
 607 }
 608
 609 static
 610 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 611 {
 612         switch (sa->sa_family) {
 613         case AF_INET:
 614                 xaddr->a4 =
 615                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 616                 return AF_INET;
 617 #if IS_ENABLED(CONFIG_IPV6)
 618         case AF_INET6:
 619                 memcpy(xaddr->a6,
 620                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 621                        sizeof(struct in6_addr));
 622                 return AF_INET6;
 623 #endif
 624         }
 625         return 0;
 626 }
 627
 628 static
 629 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 630 {
 631         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 632                                       xaddr);
 633 }
 634
 635 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 636 {
 637         const struct sadb_sa *sa;
 638         const struct sadb_address *addr;
 639         uint16_t proto;
 640         unsigned short family;
 641         xfrm_address_t *xaddr;
 642
 643         sa = ext_hdrs[SADB_EXT_SA - 1];
 644         if (sa == NULL)
 645                 return NULL;
 646
 647         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 648         if (proto == 0)
 649                 return NULL;
 650
 651         /* sadb_address_len should be checked by caller */
 652         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 653         if (addr == NULL)
 654                 return NULL;
 655
 656         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 657         switch (family) {
 658         case AF_INET:
 659                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 660                 break;
 661 #if IS_ENABLED(CONFIG_IPV6)
 662         case AF_INET6:
 663                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 664                 break;
 665 #endif
 666         default:
 667                 xaddr = NULL;
 668         }
 669
 670         if (!xaddr)
 671                 return NULL;
 672
 673         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 674 }
 675
 676 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 677
 678 static int
 679 pfkey_sockaddr_size(sa_family_t family)
 680 {
 681         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 682 }
 683
 684 static inline int pfkey_mode_from_xfrm(int mode)
 685 {
 686         switch(mode) {
 687         case XFRM_MODE_TRANSPORT:
 688                 return IPSEC_MODE_TRANSPORT;
 689         case XFRM_MODE_TUNNEL:
 690                 return IPSEC_MODE_TUNNEL;
 691         case XFRM_MODE_BEET:
 692                 return IPSEC_MODE_BEET;
 693         default:
 694                 return -1;
 695         }
 696 }
 697
 698 static inline int pfkey_mode_to_xfrm(int mode)
 699 {
 700         switch(mode) {
 701         case IPSEC_MODE_ANY:    /*XXX*/
 702         case IPSEC_MODE_TRANSPORT:
 703                 return XFRM_MODE_TRANSPORT;
 704         case IPSEC_MODE_TUNNEL:
 705                 return XFRM_MODE_TUNNEL;
 706         case IPSEC_MODE_BEET:
 707                 return XFRM_MODE_BEET;
 708         default:
 709                 return -1;
 710         }
 711 }
 712
 713 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 714                                         struct sockaddr *sa,
 715                                         unsigned short family)
 716 {
 717         switch (family) {
 718         case AF_INET:
 719             {
 720                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 721                 sin->sin_family = AF_INET;
 722                 sin->sin_port = port;
 723                 sin->sin_addr.s_addr = xaddr->a4;
 724                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 725                 return 32;
 726             }
 727 #if IS_ENABLED(CONFIG_IPV6)
 728         case AF_INET6:
 729             {
 730                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 731                 sin6->sin6_family = AF_INET6;
 732                 sin6->sin6_port = port;
 733                 sin6->sin6_flowinfo = 0;
 734                 sin6->sin6_addr = xaddr->in6;
 735                 sin6->sin6_scope_id = 0;
 736                 return 128;
 737             }
 738 #endif
 739         }
 740         return 0;
 741 }
 742
 743 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 744                                               int add_keys, int hsc)
 745 {
 746         struct sk_buff *skb;
 747         struct sadb_msg *hdr;
 748         struct sadb_sa *sa;
 749         struct sadb_lifetime *lifetime;
 750         struct sadb_address *addr;
 751         struct sadb_key *key;
 752         struct sadb_x_sa2 *sa2;
 753         struct sadb_x_sec_ctx *sec_ctx;
 754         struct xfrm_sec_ctx *xfrm_ctx;
 755         int ctx_size = 0;
 756         int size;
 757         int auth_key_size = 0;
 758         int encrypt_key_size = 0;
 759         int sockaddr_size;
 760         struct xfrm_encap_tmpl *natt = NULL;
 761         int mode;
 762
 763         /* address family check */
 764         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 765         if (!sockaddr_size)
 766                 return ERR_PTR(-EINVAL);
 767
 768         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 769            key(AE), (identity(SD),) (sensitivity)> */
 770         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 771                 sizeof(struct sadb_lifetime) +
 772                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 773                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 774                         sizeof(struct sadb_address)*2 +
 775                                 sockaddr_size*2 +
 776                                         sizeof(struct sadb_x_sa2);
 777
 778         if ((xfrm_ctx = x->security)) {
 779                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 780                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 781         }
 782
 783         /* identity & sensitivity */
 784         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 785                 size += sizeof(struct sadb_address) + sockaddr_size;
 786
 787         if (add_keys) {
 788                 if (x->aalg && x->aalg->alg_key_len) {
 789                         auth_key_size =
 790                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 791                         size += sizeof(struct sadb_key) + auth_key_size;
 792                 }
 793                 if (x->ealg && x->ealg->alg_key_len) {
 794                         encrypt_key_size =
 795                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 796                         size += sizeof(struct sadb_key) + encrypt_key_size;
 797                 }
 798         }
 799         if (x->encap)
 800                 natt = x->encap;
 801
 802         if (natt && natt->encap_type) {
 803                 size += sizeof(struct sadb_x_nat_t_type);
 804                 size += sizeof(struct sadb_x_nat_t_port);
 805                 size += sizeof(struct sadb_x_nat_t_port);
 806         }
 807
 808         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 809         if (skb == NULL)
 810                 return ERR_PTR(-ENOBUFS);
 811
 812         /* call should fill header later */
 813         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 814         memset(hdr, 0, size);   /* XXX do we need this ? */
 815         hdr->sadb_msg_len = size / sizeof(uint64_t);
 816
 817         /* sa */
 818         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 819         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 820         sa->sadb_sa_exttype = SADB_EXT_SA;
 821         sa->sadb_sa_spi = x->id.spi;
 822         sa->sadb_sa_replay = x->props.replay_window;
 823         switch (x->km.state) {
 824         case XFRM_STATE_VALID:
 825                 sa->sadb_sa_state = x->km.dying ?
 826                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 827                 break;
 828         case XFRM_STATE_ACQ:
 829                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 830                 break;
 831         default:
 832                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 833                 break;
 834         }
 835         sa->sadb_sa_auth = 0;
 836         if (x->aalg) {
 837                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 838                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 839                                         a->desc.sadb_alg_id : 0;
 840         }
 841         sa->sadb_sa_encrypt = 0;
 842         BUG_ON(x->ealg && x->calg);
 843         if (x->ealg) {
 844                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 845                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 846                                         a->desc.sadb_alg_id : 0;
 847         }
 848         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 849         if (x->calg) {
 850                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 851                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 852                                         a->desc.sadb_alg_id : 0;
 853         }
 854
 855         sa->sadb_sa_flags = 0;
 856         if (x->props.flags & XFRM_STATE_NOECN)
 857                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 858         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 859                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 860         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 861                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 862
 863         /* hard time */
 864         if (hsc & 2) {
 865                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 866                                                              sizeof(struct sadb_lifetime));
 867                 lifetime->sadb_lifetime_len =
 868                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 869                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 870                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 871                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 872                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 873                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 874         }
 875         /* soft time */
 876         if (hsc & 1) {
 877                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 878                                                              sizeof(struct sadb_lifetime));
 879                 lifetime->sadb_lifetime_len =
 880                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 881                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 882                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 883                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 884                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 885                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 886         }
 887         /* current time */
 888         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 889                                                      sizeof(struct sadb_lifetime));
 890         lifetime->sadb_lifetime_len =
 891                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 892         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 893         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 894         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 895         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 896         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 897         /* src address */
 898         addr = (struct sadb_address*) skb_put(skb,
 899                                               sizeof(struct sadb_address)+sockaddr_size);
 900         addr->sadb_address_len =
 901                 (sizeof(struct sadb_address)+sockaddr_size)/
 902                         sizeof(uint64_t);
 903         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 904         /* "if the ports are non-zero, then the sadb_address_proto field,
 905            normally zero, MUST be filled in with the transport
 906            protocol's number." - RFC2367 */
 907         addr->sadb_address_proto = 0;
 908         addr->sadb_address_reserved = 0;
 909
 910         addr->sadb_address_prefixlen =
 911                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 912                                     (struct sockaddr *) (addr + 1),
 913                                     x->props.family);
 914         if (!addr->sadb_address_prefixlen)
 915                 BUG();
 916
 917         /* dst address */
 918         addr = (struct sadb_address*) skb_put(skb,
 919                                               sizeof(struct sadb_address)+sockaddr_size);
 920         addr->sadb_address_len =
 921                 (sizeof(struct sadb_address)+sockaddr_size)/
 922                         sizeof(uint64_t);
 923         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 924         addr->sadb_address_proto = 0;
 925         addr->sadb_address_reserved = 0;
 926
 927         addr->sadb_address_prefixlen =
 928                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 929                                     (struct sockaddr *) (addr + 1),
 930                                     x->props.family);
 931         if (!addr->sadb_address_prefixlen)
 932                 BUG();
 933
 934         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 935                              x->props.family)) {
 936                 addr = (struct sadb_address*) skb_put(skb,
 937                         sizeof(struct sadb_address)+sockaddr_size);
 938                 addr->sadb_address_len =
 939                         (sizeof(struct sadb_address)+sockaddr_size)/
 940                         sizeof(uint64_t);
 941                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 942                 addr->sadb_address_proto =
 943                         pfkey_proto_from_xfrm(x->sel.proto);
 944                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 945                 addr->sadb_address_reserved = 0;
 946
 947                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 948                                     (struct sockaddr *) (addr + 1),
 949                                     x->props.family);
 950         }
 951
 952         /* auth key */
 953         if (add_keys && auth_key_size) {
 954                 key = (struct sadb_key *) skb_put(skb,
 955                                                   sizeof(struct sadb_key)+auth_key_size);
 956                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 957                         sizeof(uint64_t);
 958                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 959                 key->sadb_key_bits = x->aalg->alg_key_len;
 960                 key->sadb_key_reserved = 0;
 961                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 962         }
 963         /* encrypt key */
 964         if (add_keys && encrypt_key_size) {
 965                 key = (struct sadb_key *) skb_put(skb,
 966                                                   sizeof(struct sadb_key)+encrypt_key_size);
 967                 key->sadb_key_len = (sizeof(struct sadb_key) +
 968                                      encrypt_key_size) / sizeof(uint64_t);
 969                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 970                 key->sadb_key_bits = x->ealg->alg_key_len;
 971                 key->sadb_key_reserved = 0;
 972                 memcpy(key + 1, x->ealg->alg_key,
 973                        (x->ealg->alg_key_len+7)/8);
 974         }
 975
 976         /* sa */
 977         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 978         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 979         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 980         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 981                 kfree_skb(skb);
 982                 return ERR_PTR(-EINVAL);
 983         }
 984         sa2->sadb_x_sa2_mode = mode;
 985         sa2->sadb_x_sa2_reserved1 = 0;
 986         sa2->sadb_x_sa2_reserved2 = 0;
 987         sa2->sadb_x_sa2_sequence = 0;
 988         sa2->sadb_x_sa2_reqid = x->props.reqid;
 989
 990         if (natt && natt->encap_type) {
 991                 struct sadb_x_nat_t_type *n_type;
 992                 struct sadb_x_nat_t_port *n_port;
 993
 994                 /* type */
 995                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 996                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 997                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 998                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 999                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1000                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1001                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1002
1003                 /* source port */
1004                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1005                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1006                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1007                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1008                 n_port->sadb_x_nat_t_port_reserved = 0;
1009
1010                 /* dest port */
1011                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1012                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1013                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1014                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1015                 n_port->sadb_x_nat_t_port_reserved = 0;
1016         }
1017
1018         /* security context */
1019         if (xfrm_ctx) {
1020                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1021                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1022                 sec_ctx->sadb_x_sec_len =
1023                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1024                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1025                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1026                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1027                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1028                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1029                        xfrm_ctx->ctx_len);
1030         }
1031
1032         return skb;
1033 }
1034
1035
1036 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1037 {
1038         struct sk_buff *skb;
1039
1040         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1041
1042         return skb;
1043 }
1044
1045 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1046                                                           int hsc)
1047 {
1048         return __pfkey_xfrm_state2msg(x, 0, hsc);
1049 }
1050
1051 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1052                                                 const struct sadb_msg *hdr,
1053                                                 void * const *ext_hdrs)
1054 {
1055         struct xfrm_state *x;
1056         const struct sadb_lifetime *lifetime;
1057         const struct sadb_sa *sa;
1058         const struct sadb_key *key;
1059         const struct sadb_x_sec_ctx *sec_ctx;
1060         uint16_t proto;
1061         int err;
1062
1063
1064         sa = ext_hdrs[SADB_EXT_SA - 1];
1065         if (!sa ||
1066             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1067                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1068                 return ERR_PTR(-EINVAL);
1069         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1070             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1071                 return ERR_PTR(-EINVAL);
1072         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1073             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1074                 return ERR_PTR(-EINVAL);
1075         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1076             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1077                 return ERR_PTR(-EINVAL);
1078
1079         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1080         if (proto == 0)
1081                 return ERR_PTR(-EINVAL);
1082
1083         /* default error is no buffer space */
1084         err = -ENOBUFS;
1085
1086         /* RFC2367:
1087
1088    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1089    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1090    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1091    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1092    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1093    not true.
1094
1095            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1096            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1097          */
1098         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1099             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1100              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1101             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1102                 return ERR_PTR(-EINVAL);
1103         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1104         if (key != NULL &&
1105             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1106             ((key->sadb_key_bits+7) / 8 == 0 ||
1107              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1108                 return ERR_PTR(-EINVAL);
1109         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1110         if (key != NULL &&
1111             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1112             ((key->sadb_key_bits+7) / 8 == 0 ||
1113              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1114                 return ERR_PTR(-EINVAL);
1115
1116         x = xfrm_state_alloc(net);
1117         if (x == NULL)
1118                 return ERR_PTR(-ENOBUFS);
1119
1120         x->id.proto = proto;
1121         x->id.spi = sa->sadb_sa_spi;
1122         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1123                                         (sizeof(x->replay.bitmap) * 8));
1124         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1125                 x->props.flags |= XFRM_STATE_NOECN;
1126         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1127                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1128         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1129                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1130
1131         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1132         if (lifetime != NULL) {
1133                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1134                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1135                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1136                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1137         }
1138         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1139         if (lifetime != NULL) {
1140                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1141                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1142                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1143                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1144         }
1145
1146         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1147         if (sec_ctx != NULL) {
1148                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1149
1150                 if (!uctx)
1151                         goto out;
1152
1153                 err = security_xfrm_state_alloc(x, uctx);
1154                 kfree(uctx);
1155
1156                 if (err)
1157                         goto out;
1158         }
1159
1160         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1161         if (sa->sadb_sa_auth) {
1162                 int keysize = 0;
1163                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1164                 if (!a || !a->pfkey_supported) {
1165                         err = -ENOSYS;
1166                         goto out;
1167                 }
1168                 if (key)
1169                         keysize = (key->sadb_key_bits + 7) / 8;
1170                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1171                 if (!x->aalg) {
1172                         err = -ENOMEM;
1173                         goto out;
1174                 }
1175                 strcpy(x->aalg->alg_name, a->name);
1176                 x->aalg->alg_key_len = 0;
1177                 if (key) {
1178                         x->aalg->alg_key_len = key->sadb_key_bits;
1179                         memcpy(x->aalg->alg_key, key+1, keysize);
1180                 }
1181                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1182                 x->props.aalgo = sa->sadb_sa_auth;
1183                 /* x->algo.flags = sa->sadb_sa_flags; */
1184         }
1185         if (sa->sadb_sa_encrypt) {
1186                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1187                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1188                         if (!a || !a->pfkey_supported) {
1189                                 err = -ENOSYS;
1190                                 goto out;
1191                         }
1192                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1193                         if (!x->calg) {
1194                                 err = -ENOMEM;
1195                                 goto out;
1196                         }
1197                         strcpy(x->calg->alg_name, a->name);
1198                         x->props.calgo = sa->sadb_sa_encrypt;
1199                 } else {
1200                         int keysize = 0;
1201                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1202                         if (!a || !a->pfkey_supported) {
1203                                 err = -ENOSYS;
1204                                 goto out;
1205                         }
1206                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1207                         if (key)
1208                                 keysize = (key->sadb_key_bits + 7) / 8;
1209                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1210                         if (!x->ealg) {
1211                                 err = -ENOMEM;
1212                                 goto out;
1213                         }
1214                         strcpy(x->ealg->alg_name, a->name);
1215                         x->ealg->alg_key_len = 0;
1216                         if (key) {
1217                                 x->ealg->alg_key_len = key->sadb_key_bits;
1218                                 memcpy(x->ealg->alg_key, key+1, keysize);
1219                         }
1220                         x->props.ealgo = sa->sadb_sa_encrypt;
1221                         x->geniv = a->uinfo.encr.geniv;
1222                 }
1223         }
1224         /* x->algo.flags = sa->sadb_sa_flags; */
1225
1226         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1227                                                     &x->props.saddr);
1228         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1229                                   &x->id.daddr);
1230
1231         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1232                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1233                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1234                 if (mode < 0) {
1235                         err = -EINVAL;
1236                         goto out;
1237                 }
1238                 x->props.mode = mode;
1239                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1240         }
1241
1242         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1243                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1244
1245                 /* Nobody uses this, but we try. */
1246                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1247                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1248         }
1249
1250         if (!x->sel.family)
1251                 x->sel.family = x->props.family;
1252
1253         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1254                 const struct sadb_x_nat_t_type* n_type;
1255                 struct xfrm_encap_tmpl *natt;
1256
1257                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1258                 if (!x->encap) {
1259                         err = -ENOMEM;
1260                         goto out;
1261                 }
1262
1263                 natt = x->encap;
1264                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1265                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1266
1267                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1268                         const struct sadb_x_nat_t_port *n_port =
1269                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1270                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1271                 }
1272                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1273                         const struct sadb_x_nat_t_port *n_port =
1274                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1275                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1276                 }
1277                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1278         }
1279
1280         err = xfrm_init_state(x);
1281         if (err)
1282                 goto out;
1283
1284         x->km.seq = hdr->sadb_msg_seq;
1285         return x;
1286
1287 out:
1288         x->km.state = XFRM_STATE_DEAD;
1289         xfrm_state_put(x);
1290         return ERR_PTR(err);
1291 }
1292
1293 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1294 {
1295         return -EOPNOTSUPP;
1296 }
1297
1298 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1299 {
1300         struct net *net = sock_net(sk);
1301         struct sk_buff *resp_skb;
1302         struct sadb_x_sa2 *sa2;
1303         struct sadb_address *saddr, *daddr;
1304         struct sadb_msg *out_hdr;
1305         struct sadb_spirange *range;
1306         struct xfrm_state *x = NULL;
1307         int mode;
1308         int err;
1309         u32 min_spi, max_spi;
1310         u32 reqid;
1311         u8 proto;
1312         unsigned short family;
1313         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1314
1315         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1316                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1317                 return -EINVAL;
1318
1319         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1320         if (proto == 0)
1321                 return -EINVAL;
1322
1323         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1324                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1325                 if (mode < 0)
1326                         return -EINVAL;
1327                 reqid = sa2->sadb_x_sa2_reqid;
1328         } else {
1329                 mode = 0;
1330                 reqid = 0;
1331         }
1332
1333         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1334         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1335
1336         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1337         switch (family) {
1338         case AF_INET:
1339                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1340                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1341                 break;
1342 #if IS_ENABLED(CONFIG_IPV6)
1343         case AF_INET6:
1344                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1345                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1346                 break;
1347 #endif
1348         }
1349
1350         if (hdr->sadb_msg_seq) {
1351                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1352                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1353                         xfrm_state_put(x);
1354                         x = NULL;
1355                 }
1356         }
1357
1358         if (!x)
1359                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1360
1361         if (x == NULL)
1362                 return -ENOENT;
1363
1364         min_spi = 0x100;
1365         max_spi = 0x0fffffff;
1366
1367         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1368         if (range) {
1369                 min_spi = range->sadb_spirange_min;
1370                 max_spi = range->sadb_spirange_max;
1371         }
1372
1373         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1374         if (err) {
1375                 xfrm_state_put(x);
1376                 return err;
1377         }
1378
1379         err = xfrm_alloc_spi(x, min_spi, max_spi);
1380         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1381
1382         if (IS_ERR(resp_skb)) {
1383                 xfrm_state_put(x);
1384                 return  PTR_ERR(resp_skb);
1385         }
1386
1387         out_hdr = (struct sadb_msg *) resp_skb->data;
1388         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1389         out_hdr->sadb_msg_type = SADB_GETSPI;
1390         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1391         out_hdr->sadb_msg_errno = 0;
1392         out_hdr->sadb_msg_reserved = 0;
1393         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1394         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1395
1396         xfrm_state_put(x);
1397
1398         pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net);
1399
1400         return 0;
1401 }
1402
1403 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1404 {
1405         struct net *net = sock_net(sk);
1406         struct xfrm_state *x;
1407
1408         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1409                 return -EOPNOTSUPP;
1410
1411         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1412                 return 0;
1413
1414         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1415         if (x == NULL)
1416                 return 0;
1417
1418         spin_lock_bh(&x->lock);
1419         if (x->km.state == XFRM_STATE_ACQ)
1420                 x->km.state = XFRM_STATE_ERROR;
1421
1422         spin_unlock_bh(&x->lock);
1423         xfrm_state_put(x);
1424         return 0;
1425 }
1426
1427 static inline int event2poltype(int event)
1428 {
1429         switch (event) {
1430         case XFRM_MSG_DELPOLICY:
1431                 return SADB_X_SPDDELETE;
1432         case XFRM_MSG_NEWPOLICY:
1433                 return SADB_X_SPDADD;
1434         case XFRM_MSG_UPDPOLICY:
1435                 return SADB_X_SPDUPDATE;
1436         case XFRM_MSG_POLEXPIRE:
1437         //      return SADB_X_SPDEXPIRE;
1438         default:
1439                 pr_err("pfkey: Unknown policy event %d\n", event);
1440                 break;
1441         }
1442
1443         return 0;
1444 }
1445
1446 static inline int event2keytype(int event)
1447 {
1448         switch (event) {
1449         case XFRM_MSG_DELSA:
1450                 return SADB_DELETE;
1451         case XFRM_MSG_NEWSA:
1452                 return SADB_ADD;
1453         case XFRM_MSG_UPDSA:
1454                 return SADB_UPDATE;
1455         case XFRM_MSG_EXPIRE:
1456                 return SADB_EXPIRE;
1457         default:
1458                 pr_err("pfkey: Unknown SA event %d\n", event);
1459                 break;
1460         }
1461
1462         return 0;
1463 }
1464
1465 /* ADD/UPD/DEL */
1466 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1467 {
1468         struct sk_buff *skb;
1469         struct sadb_msg *hdr;
1470
1471         skb = pfkey_xfrm_state2msg(x);
1472
1473         if (IS_ERR(skb))
1474                 return PTR_ERR(skb);
1475
1476         hdr = (struct sadb_msg *) skb->data;
1477         hdr->sadb_msg_version = PF_KEY_V2;
1478         hdr->sadb_msg_type = event2keytype(c->event);
1479         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1480         hdr->sadb_msg_errno = 0;
1481         hdr->sadb_msg_reserved = 0;
1482         hdr->sadb_msg_seq = c->seq;
1483         hdr->sadb_msg_pid = c->portid;
1484
1485         pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x));
1486
1487         return 0;
1488 }
1489
1490 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1491 {
1492         struct net *net = sock_net(sk);
1493         struct xfrm_state *x;
1494         int err;
1495         struct km_event c;
1496
1497         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1498         if (IS_ERR(x))
1499                 return PTR_ERR(x);
1500
1501         xfrm_state_hold(x);
1502         if (hdr->sadb_msg_type == SADB_ADD)
1503                 err = xfrm_state_add(x);
1504         else
1505                 err = xfrm_state_update(x);
1506
1507         xfrm_audit_state_add(x, err ? 0 : 1, true);
1508
1509         if (err < 0) {
1510                 x->km.state = XFRM_STATE_DEAD;
1511                 __xfrm_state_put(x);
1512                 goto out;
1513         }
1514
1515         if (hdr->sadb_msg_type == SADB_ADD)
1516                 c.event = XFRM_MSG_NEWSA;
1517         else
1518                 c.event = XFRM_MSG_UPDSA;
1519         c.seq = hdr->sadb_msg_seq;
1520         c.portid = hdr->sadb_msg_pid;
1521         km_state_notify(x, &c);
1522 out:
1523         xfrm_state_put(x);
1524         return err;
1525 }
1526
1527 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1528 {
1529         struct net *net = sock_net(sk);
1530         struct xfrm_state *x;
1531         struct km_event c;
1532         int err;
1533
1534         if (!ext_hdrs[SADB_EXT_SA-1] ||
1535             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1536                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1537                 return -EINVAL;
1538
1539         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1540         if (x == NULL)
1541                 return -ESRCH;
1542
1543         if ((err = security_xfrm_state_delete(x)))
1544                 goto out;
1545
1546         if (xfrm_state_kern(x)) {
1547                 err = -EPERM;
1548                 goto out;
1549         }
1550
1551         err = xfrm_state_delete(x);
1552
1553         if (err < 0)
1554                 goto out;
1555
1556         c.seq = hdr->sadb_msg_seq;
1557         c.portid = hdr->sadb_msg_pid;
1558         c.event = XFRM_MSG_DELSA;
1559         km_state_notify(x, &c);
1560 out:
1561         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1562         xfrm_state_put(x);
1563
1564         return err;
1565 }
1566
1567 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1568 {
1569         struct net *net = sock_net(sk);
1570         __u8 proto;
1571         struct sk_buff *out_skb;
1572         struct sadb_msg *out_hdr;
1573         struct xfrm_state *x;
1574
1575         if (!ext_hdrs[SADB_EXT_SA-1] ||
1576             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1577                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1578                 return -EINVAL;
1579
1580         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1581         if (x == NULL)
1582                 return -ESRCH;
1583
1584         out_skb = pfkey_xfrm_state2msg(x);
1585         proto = x->id.proto;
1586         xfrm_state_put(x);
1587         if (IS_ERR(out_skb))
1588                 return  PTR_ERR(out_skb);
1589
1590         out_hdr = (struct sadb_msg *) out_skb->data;
1591         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1592         out_hdr->sadb_msg_type = SADB_GET;
1593         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1594         out_hdr->sadb_msg_errno = 0;
1595         out_hdr->sadb_msg_reserved = 0;
1596         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1597         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1598         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk));
1599
1600         return 0;
1601 }
1602
1603 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1604                                               gfp_t allocation)
1605 {
1606         struct sk_buff *skb;
1607         struct sadb_msg *hdr;
1608         int len, auth_len, enc_len, i;
1609
1610         auth_len = xfrm_count_pfkey_auth_supported();
1611         if (auth_len) {
1612                 auth_len *= sizeof(struct sadb_alg);
1613                 auth_len += sizeof(struct sadb_supported);
1614         }
1615
1616         enc_len = xfrm_count_pfkey_enc_supported();
1617         if (enc_len) {
1618                 enc_len *= sizeof(struct sadb_alg);
1619                 enc_len += sizeof(struct sadb_supported);
1620         }
1621
1622         len = enc_len + auth_len + sizeof(struct sadb_msg);
1623
1624         skb = alloc_skb(len + 16, allocation);
1625         if (!skb)
1626                 goto out_put_algs;
1627
1628         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1629         pfkey_hdr_dup(hdr, orig);
1630         hdr->sadb_msg_errno = 0;
1631         hdr->sadb_msg_len = len / sizeof(uint64_t);
1632
1633         if (auth_len) {
1634                 struct sadb_supported *sp;
1635                 struct sadb_alg *ap;
1636
1637                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1638                 ap = (struct sadb_alg *) (sp + 1);
1639
1640                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1641                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1642
1643                 for (i = 0; ; i++) {
1644                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1645                         if (!aalg)
1646                                 break;
1647                         if (!aalg->pfkey_supported)
1648                                 continue;
1649                         if (aalg->available)
1650                                 *ap++ = aalg->desc;
1651                 }
1652         }
1653
1654         if (enc_len) {
1655                 struct sadb_supported *sp;
1656                 struct sadb_alg *ap;
1657
1658                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1659                 ap = (struct sadb_alg *) (sp + 1);
1660
1661                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1662                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1663
1664                 for (i = 0; ; i++) {
1665                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1666                         if (!ealg)
1667                                 break;
1668                         if (!ealg->pfkey_supported)
1669                                 continue;
1670                         if (ealg->available)
1671                                 *ap++ = ealg->desc;
1672                 }
1673         }
1674
1675 out_put_algs:
1676         return skb;
1677 }
1678
1679 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1680 {
1681         struct pfkey_sock *pfk = pfkey_sk(sk);
1682         struct sk_buff *supp_skb;
1683
1684         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1685                 return -EINVAL;
1686
1687         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1688                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1689                         return -EEXIST;
1690                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1691         }
1692
1693         xfrm_probe_algs();
1694
1695         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1696         if (!supp_skb) {
1697                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1698                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1699
1700                 return -ENOBUFS;
1701         }
1702
1703         pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk));
1704
1705         return 0;
1706 }
1707
1708 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1709 {
1710         struct sk_buff *skb;
1711         struct sadb_msg *hdr;
1712
1713         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1714         if (!skb)
1715                 return -ENOBUFS;
1716
1717         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1718         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1719         hdr->sadb_msg_errno = (uint8_t) 0;
1720         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1721
1722         return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk));
1723 }
1724
1725 static int key_notify_sa_flush(const struct km_event *c)
1726 {
1727         struct sk_buff *skb;
1728         struct sadb_msg *hdr;
1729
1730         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1731         if (!skb)
1732                 return -ENOBUFS;
1733         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1734         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1735         hdr->sadb_msg_type = SADB_FLUSH;
1736         hdr->sadb_msg_seq = c->seq;
1737         hdr->sadb_msg_pid = c->portid;
1738         hdr->sadb_msg_version = PF_KEY_V2;
1739         hdr->sadb_msg_errno = (uint8_t) 0;
1740         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1741         hdr->sadb_msg_reserved = 0;
1742
1743         pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net);
1744
1745         return 0;
1746 }
1747
1748 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1749 {
1750         struct net *net = sock_net(sk);
1751         unsigned int proto;
1752         struct km_event c;
1753         int err, err2;
1754
1755         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1756         if (proto == 0)
1757                 return -EINVAL;
1758
1759         err = xfrm_state_flush(net, proto, true);
1760         err2 = unicast_flush_resp(sk, hdr);
1761         if (err || err2) {
1762                 if (err == -ESRCH) /* empty table - go quietly */
1763                         err = 0;
1764                 return err ? err : err2;
1765         }
1766
1767         c.data.proto = proto;
1768         c.seq = hdr->sadb_msg_seq;
1769         c.portid = hdr->sadb_msg_pid;
1770         c.event = XFRM_MSG_FLUSHSA;
1771         c.net = net;
1772         km_state_notify(NULL, &c);
1773
1774         return 0;
1775 }
1776
1777 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1778 {
1779         struct pfkey_sock *pfk = ptr;
1780         struct sk_buff *out_skb;
1781         struct sadb_msg *out_hdr;
1782
1783         if (!pfkey_can_dump(&pfk->sk))
1784                 return -ENOBUFS;
1785
1786         out_skb = pfkey_xfrm_state2msg(x);
1787         if (IS_ERR(out_skb))
1788                 return PTR_ERR(out_skb);
1789
1790         out_hdr = (struct sadb_msg *) out_skb->data;
1791         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1792         out_hdr->sadb_msg_type = SADB_DUMP;
1793         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1794         out_hdr->sadb_msg_errno = 0;
1795         out_hdr->sadb_msg_reserved = 0;
1796         out_hdr->sadb_msg_seq = count + 1;
1797         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1798
1799         if (pfk->dump.skb)
1800                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
1801                                 &pfk->sk, sock_net(&pfk->sk));
1802         pfk->dump.skb = out_skb;
1803
1804         return 0;
1805 }
1806
1807 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1808 {
1809         struct net *net = sock_net(&pfk->sk);
1810         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1811 }
1812
1813 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1814 {
1815         struct net *net = sock_net(&pfk->sk);
1816
1817         xfrm_state_walk_done(&pfk->dump.u.state, net);
1818 }
1819
1820 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1821 {
1822         u8 proto;
1823         struct xfrm_address_filter *filter = NULL;
1824         struct pfkey_sock *pfk = pfkey_sk(sk);
1825
1826         mutex_lock(&pfk->dump_lock);
1827         if (pfk->dump.dump != NULL) {
1828                 mutex_unlock(&pfk->dump_lock);
1829                 return -EBUSY;
1830         }
1831
1832         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1833         if (proto == 0) {
1834                 mutex_unlock(&pfk->dump_lock);
1835                 return -EINVAL;
1836         }
1837
1838         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1839                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1840
1841                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1842                 if (filter == NULL) {
1843                         mutex_unlock(&pfk->dump_lock);
1844                         return -ENOMEM;
1845                 }
1846
1847                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1848                        sizeof(xfrm_address_t));
1849                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1850                        sizeof(xfrm_address_t));
1851                 filter->family = xfilter->sadb_x_filter_family;
1852                 filter->splen = xfilter->sadb_x_filter_splen;
1853                 filter->dplen = xfilter->sadb_x_filter_dplen;
1854         }
1855
1856         pfk->dump.msg_version = hdr->sadb_msg_version;
1857         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1858         pfk->dump.dump = pfkey_dump_sa;
1859         pfk->dump.done = pfkey_dump_sa_done;
1860         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1861         mutex_unlock(&pfk->dump_lock);
1862
1863         return pfkey_do_dump(pfk);
1864 }
1865
1866 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1867 {
1868         struct pfkey_sock *pfk = pfkey_sk(sk);
1869         int satype = hdr->sadb_msg_satype;
1870         bool reset_errno = false;
1871
1872         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1873                 reset_errno = true;
1874                 if (satype != 0 && satype != 1)
1875                         return -EINVAL;
1876                 pfk->promisc = satype;
1877         }
1878         if (reset_errno && skb_cloned(skb))
1879                 skb = skb_copy(skb, GFP_KERNEL);
1880         else
1881                 skb = skb_clone(skb, GFP_KERNEL);
1882
1883         if (reset_errno && skb) {
1884                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1885                 new_hdr->sadb_msg_errno = 0;
1886         }
1887
1888         pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk));
1889         return 0;
1890 }
1891
1892 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1893 {
1894         int i;
1895         u32 reqid = *(u32*)ptr;
1896
1897         for (i=0; i<xp->xfrm_nr; i++) {
1898                 if (xp->xfrm_vec[i].reqid == reqid)
1899                         return -EEXIST;
1900         }
1901         return 0;
1902 }
1903
1904 static u32 gen_reqid(struct net *net)
1905 {
1906         struct xfrm_policy_walk walk;
1907         u32 start;
1908         int rc;
1909         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1910
1911         start = reqid;
1912         do {
1913                 ++reqid;
1914                 if (reqid == 0)
1915                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1916                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1917                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1918                 xfrm_policy_walk_done(&walk, net);
1919                 if (rc != -EEXIST)
1920                         return reqid;
1921         } while (reqid != start);
1922         return 0;
1923 }
1924
1925 static int
1926 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1927 {
1928         struct net *net = xp_net(xp);
1929         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1930         int mode;
1931
1932         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1933                 return -ELOOP;
1934
1935         if (rq->sadb_x_ipsecrequest_mode == 0)
1936                 return -EINVAL;
1937
1938         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1939         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1940                 return -EINVAL;
1941         t->mode = mode;
1942         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1943                 t->optional = 1;
1944         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1945                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1946                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1947                         t->reqid = 0;
1948                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1949                         return -ENOBUFS;
1950         }
1951
1952         /* addresses present only in tunnel mode */
1953         if (t->mode == XFRM_MODE_TUNNEL) {
1954                 int err;
1955
1956                 err = parse_sockaddr_pair(
1957                         (struct sockaddr *)(rq + 1),
1958                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1959                         &t->saddr, &t->id.daddr, &t->encap_family);
1960                 if (err)
1961                         return err;
1962         } else
1963                 t->encap_family = xp->family;
1964
1965         /* No way to set this via kame pfkey */
1966         t->allalgs = 1;
1967         xp->xfrm_nr++;
1968         return 0;
1969 }
1970
1971 static int
1972 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1973 {
1974         int err;
1975         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1976         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1977
1978         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1979                 return -EINVAL;
1980
1981         while (len >= sizeof(*rq)) {
1982                 if (len < rq->sadb_x_ipsecrequest_len ||
1983                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
1984                         return -EINVAL;
1985
1986                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1987                         return err;
1988                 len -= rq->sadb_x_ipsecrequest_len;
1989                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1990         }
1991         return 0;
1992 }
1993
1994 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1995 {
1996   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1997
1998         if (xfrm_ctx) {
1999                 int len = sizeof(struct sadb_x_sec_ctx);
2000                 len += xfrm_ctx->ctx_len;
2001                 return PFKEY_ALIGN8(len);
2002         }
2003         return 0;
2004 }
2005
2006 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2007 {
2008         const struct xfrm_tmpl *t;
2009         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2010         int socklen = 0;
2011         int i;
2012
2013         for (i=0; i<xp->xfrm_nr; i++) {
2014                 t = xp->xfrm_vec + i;
2015                 socklen += pfkey_sockaddr_len(t->encap_family);
2016         }
2017
2018         return sizeof(struct sadb_msg) +
2019                 (sizeof(struct sadb_lifetime) * 3) +
2020                 (sizeof(struct sadb_address) * 2) +
2021                 (sockaddr_size * 2) +
2022                 sizeof(struct sadb_x_policy) +
2023                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2024                 (socklen * 2) +
2025                 pfkey_xfrm_policy2sec_ctx_size(xp);
2026 }
2027
2028 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2029 {
2030         struct sk_buff *skb;
2031         int size;
2032
2033         size = pfkey_xfrm_policy2msg_size(xp);
2034
2035         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2036         if (skb == NULL)
2037                 return ERR_PTR(-ENOBUFS);
2038
2039         return skb;
2040 }
2041
2042 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2043 {
2044         struct sadb_msg *hdr;
2045         struct sadb_address *addr;
2046         struct sadb_lifetime *lifetime;
2047         struct sadb_x_policy *pol;
2048         struct sadb_x_sec_ctx *sec_ctx;
2049         struct xfrm_sec_ctx *xfrm_ctx;
2050         int i;
2051         int size;
2052         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2053         int socklen = pfkey_sockaddr_len(xp->family);
2054
2055         size = pfkey_xfrm_policy2msg_size(xp);
2056
2057         /* call should fill header later */
2058         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2059         memset(hdr, 0, size);   /* XXX do we need this ? */
2060
2061         /* src address */
2062         addr = (struct sadb_address*) skb_put(skb,
2063                                               sizeof(struct sadb_address)+sockaddr_size);
2064         addr->sadb_address_len =
2065                 (sizeof(struct sadb_address)+sockaddr_size)/
2066                         sizeof(uint64_t);
2067         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2068         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2069         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2070         addr->sadb_address_reserved = 0;
2071         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2072                                  xp->selector.sport,
2073                                  (struct sockaddr *) (addr + 1),
2074                                  xp->family))
2075                 BUG();
2076
2077         /* dst address */
2078         addr = (struct sadb_address*) skb_put(skb,
2079                                               sizeof(struct sadb_address)+sockaddr_size);
2080         addr->sadb_address_len =
2081                 (sizeof(struct sadb_address)+sockaddr_size)/
2082                         sizeof(uint64_t);
2083         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2084         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2085         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2086         addr->sadb_address_reserved = 0;
2087
2088         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2089                             (struct sockaddr *) (addr + 1),
2090                             xp->family);
2091
2092         /* hard time */
2093         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2094                                                      sizeof(struct sadb_lifetime));
2095         lifetime->sadb_lifetime_len =
2096                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2097         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2098         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2099         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2100         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2101         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2102         /* soft time */
2103         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2104                                                      sizeof(struct sadb_lifetime));
2105         lifetime->sadb_lifetime_len =
2106                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2107         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2108         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2109         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2110         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2111         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2112         /* current time */
2113         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2114                                                      sizeof(struct sadb_lifetime));
2115         lifetime->sadb_lifetime_len =
2116                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2117         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2118         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2119         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2120         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2121         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2122
2123         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2124         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2125         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2126         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2127         if (xp->action == XFRM_POLICY_ALLOW) {
2128                 if (xp->xfrm_nr)
2129                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2130                 else
2131                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2132         }
2133         pol->sadb_x_policy_dir = dir+1;
2134         pol->sadb_x_policy_reserved = 0;
2135         pol->sadb_x_policy_id = xp->index;
2136         pol->sadb_x_policy_priority = xp->priority;
2137
2138         for (i=0; i<xp->xfrm_nr; i++) {
2139                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2140                 struct sadb_x_ipsecrequest *rq;
2141                 int req_size;
2142                 int mode;
2143
2144                 req_size = sizeof(struct sadb_x_ipsecrequest);
2145                 if (t->mode == XFRM_MODE_TUNNEL) {
2146                         socklen = pfkey_sockaddr_len(t->encap_family);
2147                         req_size += socklen * 2;
2148                 } else {
2149                         size -= 2*socklen;
2150                 }
2151                 rq = (void*)skb_put(skb, req_size);
2152                 pol->sadb_x_policy_len += req_size/8;
2153                 memset(rq, 0, sizeof(*rq));
2154                 rq->sadb_x_ipsecrequest_len = req_size;
2155                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2156                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2157                         return -EINVAL;
2158                 rq->sadb_x_ipsecrequest_mode = mode;
2159                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2160                 if (t->reqid)
2161                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2162                 if (t->optional)
2163                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2164                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2165
2166                 if (t->mode == XFRM_MODE_TUNNEL) {
2167                         u8 *sa = (void *)(rq + 1);
2168                         pfkey_sockaddr_fill(&t->saddr, 0,
2169                                             (struct sockaddr *)sa,
2170                                             t->encap_family);
2171                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2172                                             (struct sockaddr *) (sa + socklen),
2173                                             t->encap_family);
2174                 }
2175         }
2176
2177         /* security context */
2178         if ((xfrm_ctx = xp->security)) {
2179                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2180
2181                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2182                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2183                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2184                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2185                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2186                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2187                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2188                        xfrm_ctx->ctx_len);
2189         }
2190
2191         hdr->sadb_msg_len = size / sizeof(uint64_t);
2192         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2193
2194         return 0;
2195 }
2196
2197 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2198 {
2199         struct sk_buff *out_skb;
2200         struct sadb_msg *out_hdr;
2201         int err;
2202
2203         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2204         if (IS_ERR(out_skb))
2205                 return PTR_ERR(out_skb);
2206
2207         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2208         if (err < 0)
2209                 return err;
2210
2211         out_hdr = (struct sadb_msg *) out_skb->data;
2212         out_hdr->sadb_msg_version = PF_KEY_V2;
2213
2214         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2215                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2216         else
2217                 out_hdr->sadb_msg_type = event2poltype(c->event);
2218         out_hdr->sadb_msg_errno = 0;
2219         out_hdr->sadb_msg_seq = c->seq;
2220         out_hdr->sadb_msg_pid = c->portid;
2221         pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp));
2222         return 0;
2223
2224 }
2225
2226 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2227 {
2228         struct net *net = sock_net(sk);
2229         int err = 0;
2230         struct sadb_lifetime *lifetime;
2231         struct sadb_address *sa;
2232         struct sadb_x_policy *pol;
2233         struct xfrm_policy *xp;
2234         struct km_event c;
2235         struct sadb_x_sec_ctx *sec_ctx;
2236
2237         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2238                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2239             !ext_hdrs[SADB_X_EXT_POLICY-1])
2240                 return -EINVAL;
2241
2242         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2243         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2244                 return -EINVAL;
2245         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2246                 return -EINVAL;
2247
2248         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2249         if (xp == NULL)
2250                 return -ENOBUFS;
2251
2252         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2253                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2254         xp->priority = pol->sadb_x_policy_priority;
2255
2256         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2257         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2258         xp->selector.family = xp->family;
2259         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2260         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2261         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2262         if (xp->selector.sport)
2263                 xp->selector.sport_mask = htons(0xffff);
2264
2265         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2266         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2267         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2268
2269         /* Amusing, we set this twice.  KAME apps appear to set same value
2270          * in both addresses.
2271          */
2272         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2273
2274         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2275         if (xp->selector.dport)
2276                 xp->selector.dport_mask = htons(0xffff);
2277
2278         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2279         if (sec_ctx != NULL) {
2280                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2281
2282                 if (!uctx) {
2283                         err = -ENOBUFS;
2284                         goto out;
2285                 }
2286
2287                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2288                 kfree(uctx);
2289
2290                 if (err)
2291                         goto out;
2292         }
2293
2294         xp->lft.soft_byte_limit = XFRM_INF;
2295         xp->lft.hard_byte_limit = XFRM_INF;
2296         xp->lft.soft_packet_limit = XFRM_INF;
2297         xp->lft.hard_packet_limit = XFRM_INF;
2298         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2299                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2300                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2301                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2302                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2303         }
2304         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2305                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2306                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2307                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2308                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2309         }
2310         xp->xfrm_nr = 0;
2311         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2312             (err = parse_ipsecrequests(xp, pol)) < 0)
2313                 goto out;
2314
2315         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2316                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2317
2318         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2319
2320         if (err)
2321                 goto out;
2322
2323         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2324                 c.event = XFRM_MSG_UPDPOLICY;
2325         else
2326                 c.event = XFRM_MSG_NEWPOLICY;
2327
2328         c.seq = hdr->sadb_msg_seq;
2329         c.portid = hdr->sadb_msg_pid;
2330
2331         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2332         xfrm_pol_put(xp);
2333         return 0;
2334
2335 out:
2336         xp->walk.dead = 1;
2337         xfrm_policy_destroy(xp);
2338         return err;
2339 }
2340
2341 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2342 {
2343         struct net *net = sock_net(sk);
2344         int err;
2345         struct sadb_address *sa;
2346         struct sadb_x_policy *pol;
2347         struct xfrm_policy *xp;
2348         struct xfrm_selector sel;
2349         struct km_event c;
2350         struct sadb_x_sec_ctx *sec_ctx;
2351         struct xfrm_sec_ctx *pol_ctx = NULL;
2352
2353         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2354                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2355             !ext_hdrs[SADB_X_EXT_POLICY-1])
2356                 return -EINVAL;
2357
2358         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2359         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2360                 return -EINVAL;
2361
2362         memset(&sel, 0, sizeof(sel));
2363
2364         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2365         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2366         sel.prefixlen_s = sa->sadb_address_prefixlen;
2367         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2368         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2369         if (sel.sport)
2370                 sel.sport_mask = htons(0xffff);
2371
2372         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2373         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2374         sel.prefixlen_d = sa->sadb_address_prefixlen;
2375         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2376         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2377         if (sel.dport)
2378                 sel.dport_mask = htons(0xffff);
2379
2380         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2381         if (sec_ctx != NULL) {
2382                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2383
2384                 if (!uctx)
2385                         return -ENOMEM;
2386
2387                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2388                 kfree(uctx);
2389                 if (err)
2390                         return err;
2391         }
2392
2393         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2394                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2395                                    1, &err);
2396         security_xfrm_policy_free(pol_ctx);
2397         if (xp == NULL)
2398                 return -ENOENT;
2399
2400         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2401
2402         if (err)
2403                 goto out;
2404
2405         c.seq = hdr->sadb_msg_seq;
2406         c.portid = hdr->sadb_msg_pid;
2407         c.data.byid = 0;
2408         c.event = XFRM_MSG_DELPOLICY;
2409         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2410
2411 out:
2412         xfrm_pol_put(xp);
2413         if (err == 0)
2414                 xfrm_garbage_collect(net);
2415         return err;
2416 }
2417
2418 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2419 {
2420         int err;
2421         struct sk_buff *out_skb;
2422         struct sadb_msg *out_hdr;
2423         err = 0;
2424
2425         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2426         if (IS_ERR(out_skb)) {
2427                 err =  PTR_ERR(out_skb);
2428                 goto out;
2429         }
2430         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2431         if (err < 0)
2432                 goto out;
2433
2434         out_hdr = (struct sadb_msg *) out_skb->data;
2435         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2436         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2437         out_hdr->sadb_msg_satype = 0;
2438         out_hdr->sadb_msg_errno = 0;
2439         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2440         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2441         pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp));
2442         err = 0;
2443
2444 out:
2445         return err;
2446 }
2447
2448 static int pfkey_sockaddr_pair_size(sa_family_t family)
2449 {
2450         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2451 }
2452
2453 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2454                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2455                                u16 *family)
2456 {
2457         int af, socklen;
2458
2459         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2460                 return -EINVAL;
2461
2462         af = pfkey_sockaddr_extract(sa, saddr);
2463         if (!af)
2464                 return -EINVAL;
2465
2466         socklen = pfkey_sockaddr_len(af);
2467         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2468                                    daddr) != af)
2469                 return -EINVAL;
2470
2471         *family = af;
2472         return 0;
2473 }
2474
2475 #ifdef CONFIG_NET_KEY_MIGRATE
2476 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2477                                     struct xfrm_migrate *m)
2478 {
2479         int err;
2480         struct sadb_x_ipsecrequest *rq2;
2481         int mode;
2482
2483         if (len < sizeof(*rq1) ||
2484             len < rq1->sadb_x_ipsecrequest_len ||
2485             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2486                 return -EINVAL;
2487
2488         /* old endoints */
2489         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2490                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2491                                   &m->old_saddr, &m->old_daddr,
2492                                   &m->old_family);
2493         if (err)
2494                 return err;
2495
2496         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2497         len -= rq1->sadb_x_ipsecrequest_len;
2498
2499         if (len <= sizeof(*rq2) ||
2500             len < rq2->sadb_x_ipsecrequest_len ||
2501             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2502                 return -EINVAL;
2503
2504         /* new endpoints */
2505         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2506                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2507                                   &m->new_saddr, &m->new_daddr,
2508                                   &m->new_family);
2509         if (err)
2510                 return err;
2511
2512         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2513             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2514             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2515                 return -EINVAL;
2516
2517         m->proto = rq1->sadb_x_ipsecrequest_proto;
2518         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2519                 return -EINVAL;
2520         m->mode = mode;
2521         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2522
2523         return ((int)(rq1->sadb_x_ipsecrequest_len +
2524                       rq2->sadb_x_ipsecrequest_len));
2525 }
2526
2527 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2528                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2529 {
2530         int i, len, ret, err = -EINVAL;
2531         u8 dir;
2532         struct sadb_address *sa;
2533         struct sadb_x_kmaddress *kma;
2534         struct sadb_x_policy *pol;
2535         struct sadb_x_ipsecrequest *rq;
2536         struct xfrm_selector sel;
2537         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2538         struct xfrm_kmaddress k;
2539         struct net *net = sock_net(sk);
2540
2541         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2542                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2543             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2544                 err = -EINVAL;
2545                 goto out;
2546         }
2547
2548         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2549         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2550
2551         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2552                 err = -EINVAL;
2553                 goto out;
2554         }
2555
2556         if (kma) {
2557                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2558                 k.reserved = kma->sadb_x_kmaddress_reserved;
2559                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2560                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2561                                           &k.local, &k.remote, &k.family);
2562                 if (ret < 0) {
2563                         err = ret;
2564                         goto out;
2565                 }
2566         }
2567
2568         dir = pol->sadb_x_policy_dir - 1;
2569         memset(&sel, 0, sizeof(sel));
2570
2571         /* set source address info of selector */
2572         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2573         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2574         sel.prefixlen_s = sa->sadb_address_prefixlen;
2575         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2576         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2577         if (sel.sport)
2578                 sel.sport_mask = htons(0xffff);
2579
2580         /* set destination address info of selector */
2581         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2582         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2583         sel.prefixlen_d = sa->sadb_address_prefixlen;
2584         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2585         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2586         if (sel.dport)
2587                 sel.dport_mask = htons(0xffff);
2588
2589         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2590
2591         /* extract ipsecrequests */
2592         i = 0;
2593         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2594
2595         while (len > 0 && i < XFRM_MAX_DEPTH) {
2596                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2597                 if (ret < 0) {
2598                         err = ret;
2599                         goto out;
2600                 } else {
2601                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2602                         len -= ret;
2603                         i++;
2604                 }
2605         }
2606
2607         if (!i || len > 0) {
2608                 err = -EINVAL;
2609                 goto out;
2610         }
2611
2612         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2613                             kma ? &k : NULL, net);
2614
2615  out:
2616         return err;
2617 }
2618 #else
2619 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2620                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2621 {
2622         return -ENOPROTOOPT;
2623 }
2624 #endif
2625
2626
2627 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2628 {
2629         struct net *net = sock_net(sk);
2630         unsigned int dir;
2631         int err = 0, delete;
2632         struct sadb_x_policy *pol;
2633         struct xfrm_policy *xp;
2634         struct km_event c;
2635
2636         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2637                 return -EINVAL;
2638
2639         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2640         if (dir >= XFRM_POLICY_MAX)
2641                 return -EINVAL;
2642
2643         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2644         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2645                               dir, pol->sadb_x_policy_id, delete, &err);
2646         if (xp == NULL)
2647                 return -ENOENT;
2648
2649         if (delete) {
2650                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2651
2652                 if (err)
2653                         goto out;
2654                 c.seq = hdr->sadb_msg_seq;
2655                 c.portid = hdr->sadb_msg_pid;
2656                 c.data.byid = 1;
2657                 c.event = XFRM_MSG_DELPOLICY;
2658                 km_policy_notify(xp, dir, &c);
2659         } else {
2660                 err = key_pol_get_resp(sk, xp, hdr, dir);
2661         }
2662
2663 out:
2664         xfrm_pol_put(xp);
2665         if (delete && err == 0)
2666                 xfrm_garbage_collect(net);
2667         return err;
2668 }
2669
2670 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2671 {
2672         struct pfkey_sock *pfk = ptr;
2673         struct sk_buff *out_skb;
2674         struct sadb_msg *out_hdr;
2675         int err;
2676
2677         if (!pfkey_can_dump(&pfk->sk))
2678                 return -ENOBUFS;
2679
2680         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2681         if (IS_ERR(out_skb))
2682                 return PTR_ERR(out_skb);
2683
2684         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2685         if (err < 0)
2686                 return err;
2687
2688         out_hdr = (struct sadb_msg *) out_skb->data;
2689         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2690         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2691         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2692         out_hdr->sadb_msg_errno = 0;
2693         out_hdr->sadb_msg_seq = count + 1;
2694         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2695
2696         if (pfk->dump.skb)
2697                 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE,
2698                                 &pfk->sk, sock_net(&pfk->sk));
2699         pfk->dump.skb = out_skb;
2700
2701         return 0;
2702 }
2703
2704 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2705 {
2706         struct net *net = sock_net(&pfk->sk);
2707         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2708 }
2709
2710 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2711 {
2712         struct net *net = sock_net((struct sock *)pfk);
2713
2714         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2715 }
2716
2717 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2718 {
2719         struct pfkey_sock *pfk = pfkey_sk(sk);
2720
2721         mutex_lock(&pfk->dump_lock);
2722         if (pfk->dump.dump != NULL) {
2723                 mutex_unlock(&pfk->dump_lock);
2724                 return -EBUSY;
2725         }
2726
2727         pfk->dump.msg_version = hdr->sadb_msg_version;
2728         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2729         pfk->dump.dump = pfkey_dump_sp;
2730         pfk->dump.done = pfkey_dump_sp_done;
2731         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2732         mutex_unlock(&pfk->dump_lock);
2733
2734         return pfkey_do_dump(pfk);
2735 }
2736
2737 static int key_notify_policy_flush(const struct km_event *c)
2738 {
2739         struct sk_buff *skb_out;
2740         struct sadb_msg *hdr;
2741
2742         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2743         if (!skb_out)
2744                 return -ENOBUFS;
2745         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2746         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2747         hdr->sadb_msg_seq = c->seq;
2748         hdr->sadb_msg_pid = c->portid;
2749         hdr->sadb_msg_version = PF_KEY_V2;
2750         hdr->sadb_msg_errno = (uint8_t) 0;
2751         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2752         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2753         hdr->sadb_msg_reserved = 0;
2754         pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net);
2755         return 0;
2756
2757 }
2758
2759 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2760 {
2761         struct net *net = sock_net(sk);
2762         struct km_event c;
2763         int err, err2;
2764
2765         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2766         if (!err)
2767                 xfrm_garbage_collect(net);
2768         err2 = unicast_flush_resp(sk, hdr);
2769         if (err || err2) {
2770                 if (err == -ESRCH) /* empty table - old silent behavior */
2771                         return 0;
2772                 return err;
2773         }
2774
2775         c.data.type = XFRM_POLICY_TYPE_MAIN;
2776         c.event = XFRM_MSG_FLUSHPOLICY;
2777         c.portid = hdr->sadb_msg_pid;
2778         c.seq = hdr->sadb_msg_seq;
2779         c.net = net;
2780         km_policy_notify(NULL, 0, &c);
2781
2782         return 0;
2783 }
2784
2785 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2786                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2787 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2788         [SADB_RESERVED]         = pfkey_reserved,
2789         [SADB_GETSPI]           = pfkey_getspi,
2790         [SADB_UPDATE]           = pfkey_add,
2791         [SADB_ADD]              = pfkey_add,
2792         [SADB_DELETE]           = pfkey_delete,
2793         [SADB_GET]              = pfkey_get,
2794         [SADB_ACQUIRE]          = pfkey_acquire,
2795         [SADB_REGISTER]         = pfkey_register,
2796         [SADB_EXPIRE]           = NULL,
2797         [SADB_FLUSH]            = pfkey_flush,
2798         [SADB_DUMP]             = pfkey_dump,
2799         [SADB_X_PROMISC]        = pfkey_promisc,
2800         [SADB_X_PCHANGE]        = NULL,
2801         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2802         [SADB_X_SPDADD]         = pfkey_spdadd,
2803         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2804         [SADB_X_SPDGET]         = pfkey_spdget,
2805         [SADB_X_SPDACQUIRE]     = NULL,
2806         [SADB_X_SPDDUMP]        = pfkey_spddump,
2807         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2808         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2809         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2810         [SADB_X_MIGRATE]        = pfkey_migrate,
2811 };
2812
2813 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2814 {
2815         void *ext_hdrs[SADB_EXT_MAX];
2816         int err;
2817
2818         pfkey_broadcast(skb_clone(skb, GFP_KERNEL),
2819                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2820
2821         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2822         err = parse_exthdrs(skb, hdr, ext_hdrs);
2823         if (!err) {
2824                 err = -EOPNOTSUPP;
2825                 if (pfkey_funcs[hdr->sadb_msg_type])
2826                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2827         }
2828         return err;
2829 }
2830
2831 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2832 {
2833         struct sadb_msg *hdr = NULL;
2834
2835         if (skb->len < sizeof(*hdr)) {
2836                 *errp = -EMSGSIZE;
2837         } else {
2838                 hdr = (struct sadb_msg *) skb->data;
2839                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2840                     hdr->sadb_msg_reserved != 0 ||
2841                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2842                      hdr->sadb_msg_type > SADB_MAX)) {
2843                         hdr = NULL;
2844                         *errp = -EINVAL;
2845                 } else if (hdr->sadb_msg_len != (skb->len /
2846                                                  sizeof(uint64_t)) ||
2847                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2848                                                 sizeof(uint64_t))) {
2849                         hdr = NULL;
2850                         *errp = -EMSGSIZE;
2851                 } else {
2852                         *errp = 0;
2853                 }
2854         }
2855         return hdr;
2856 }
2857
2858 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2859                                 const struct xfrm_algo_desc *d)
2860 {
2861         unsigned int id = d->desc.sadb_alg_id;
2862
2863         if (id >= sizeof(t->aalgos) * 8)
2864                 return 0;
2865
2866         return (t->aalgos >> id) & 1;
2867 }
2868
2869 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2870                                 const struct xfrm_algo_desc *d)
2871 {
2872         unsigned int id = d->desc.sadb_alg_id;
2873
2874         if (id >= sizeof(t->ealgos) * 8)
2875                 return 0;
2876
2877         return (t->ealgos >> id) & 1;
2878 }
2879
2880 static int count_ah_combs(const struct xfrm_tmpl *t)
2881 {
2882         int i, sz = 0;
2883
2884         for (i = 0; ; i++) {
2885                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2886                 if (!aalg)
2887                         break;
2888                 if (!aalg->pfkey_supported)
2889                         continue;
2890                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2891                         sz += sizeof(struct sadb_comb);
2892         }
2893         return sz + sizeof(struct sadb_prop);
2894 }
2895
2896 static int count_esp_combs(const struct xfrm_tmpl *t)
2897 {
2898         int i, k, sz = 0;
2899
2900         for (i = 0; ; i++) {
2901                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2902                 if (!ealg)
2903                         break;
2904
2905                 if (!ealg->pfkey_supported)
2906                         continue;
2907
2908                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2909                         continue;
2910
2911                 for (k = 1; ; k++) {
2912                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2913                         if (!aalg)
2914                                 break;
2915
2916                         if (!aalg->pfkey_supported)
2917                                 continue;
2918
2919                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2920                                 sz += sizeof(struct sadb_comb);
2921                 }
2922         }
2923         return sz + sizeof(struct sadb_prop);
2924 }
2925
2926 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2927 {
2928         struct sadb_prop *p;
2929         int i;
2930
2931         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2932         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2933         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2934         p->sadb_prop_replay = 32;
2935         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2936
2937         for (i = 0; ; i++) {
2938                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2939                 if (!aalg)
2940                         break;
2941
2942                 if (!aalg->pfkey_supported)
2943                         continue;
2944
2945                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2946                         struct sadb_comb *c;
2947                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2948                         memset(c, 0, sizeof(*c));
2949                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2950                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2951                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2952                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2953                         c->sadb_comb_hard_addtime = 24*60*60;
2954                         c->sadb_comb_soft_addtime = 20*60*60;
2955                         c->sadb_comb_hard_usetime = 8*60*60;
2956                         c->sadb_comb_soft_usetime = 7*60*60;
2957                 }
2958         }
2959 }
2960
2961 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2962 {
2963         struct sadb_prop *p;
2964         int i, k;
2965
2966         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2967         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2968         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2969         p->sadb_prop_replay = 32;
2970         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2971
2972         for (i=0; ; i++) {
2973                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2974                 if (!ealg)
2975                         break;
2976
2977                 if (!ealg->pfkey_supported)
2978                         continue;
2979
2980                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2981                         continue;
2982
2983                 for (k = 1; ; k++) {
2984                         struct sadb_comb *c;
2985                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2986                         if (!aalg)
2987                                 break;
2988                         if (!aalg->pfkey_supported)
2989                                 continue;
2990                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2991                                 continue;
2992                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2993                         memset(c, 0, sizeof(*c));
2994                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2995                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2996                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2997                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2998                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2999                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3000                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3001                         c->sadb_comb_hard_addtime = 24*60*60;
3002                         c->sadb_comb_soft_addtime = 20*60*60;
3003                         c->sadb_comb_hard_usetime = 8*60*60;
3004                         c->sadb_comb_soft_usetime = 7*60*60;
3005                 }
3006         }
3007 }
3008
3009 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3010 {
3011         return 0;
3012 }
3013
3014 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3015 {
3016         struct sk_buff *out_skb;
3017         struct sadb_msg *out_hdr;
3018         int hard;
3019         int hsc;
3020
3021         hard = c->data.hard;
3022         if (hard)
3023                 hsc = 2;
3024         else
3025                 hsc = 1;
3026
3027         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3028         if (IS_ERR(out_skb))
3029                 return PTR_ERR(out_skb);
3030
3031         out_hdr = (struct sadb_msg *) out_skb->data;
3032         out_hdr->sadb_msg_version = PF_KEY_V2;
3033         out_hdr->sadb_msg_type = SADB_EXPIRE;
3034         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3035         out_hdr->sadb_msg_errno = 0;
3036         out_hdr->sadb_msg_reserved = 0;
3037         out_hdr->sadb_msg_seq = 0;
3038         out_hdr->sadb_msg_pid = 0;
3039
3040         pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3041         return 0;
3042 }
3043
3044 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3045 {
3046         struct net *net = x ? xs_net(x) : c->net;
3047         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3048
3049         if (atomic_read(&net_pfkey->socks_nr) == 0)
3050                 return 0;
3051
3052         switch (c->event) {
3053         case XFRM_MSG_EXPIRE:
3054                 return key_notify_sa_expire(x, c);
3055         case XFRM_MSG_DELSA:
3056         case XFRM_MSG_NEWSA:
3057         case XFRM_MSG_UPDSA:
3058                 return key_notify_sa(x, c);
3059         case XFRM_MSG_FLUSHSA:
3060                 return key_notify_sa_flush(c);
3061         case XFRM_MSG_NEWAE: /* not yet supported */
3062                 break;
3063         default:
3064                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3065                 break;
3066         }
3067
3068         return 0;
3069 }
3070
3071 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3072 {
3073         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3074                 return 0;
3075
3076         switch (c->event) {
3077         case XFRM_MSG_POLEXPIRE:
3078                 return key_notify_policy_expire(xp, c);
3079         case XFRM_MSG_DELPOLICY:
3080         case XFRM_MSG_NEWPOLICY:
3081         case XFRM_MSG_UPDPOLICY:
3082                 return key_notify_policy(xp, dir, c);
3083         case XFRM_MSG_FLUSHPOLICY:
3084                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3085                         break;
3086                 return key_notify_policy_flush(c);
3087         default:
3088                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3089                 break;
3090         }
3091
3092         return 0;
3093 }
3094
3095 static u32 get_acqseq(void)
3096 {
3097         u32 res;
3098         static atomic_t acqseq;
3099
3100         do {
3101                 res = atomic_inc_return(&acqseq);
3102         } while (!res);
3103         return res;
3104 }
3105
3106 static bool pfkey_is_alive(const struct km_event *c)
3107 {
3108         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3109         struct sock *sk;
3110         bool is_alive = false;
3111
3112         rcu_read_lock();
3113         sk_for_each_rcu(sk, &net_pfkey->table) {
3114                 if (pfkey_sk(sk)->registered) {
3115                         is_alive = true;
3116                         break;
3117                 }
3118         }
3119         rcu_read_unlock();
3120
3121         return is_alive;
3122 }
3123
3124 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3125 {
3126         struct sk_buff *skb;
3127         struct sadb_msg *hdr;
3128         struct sadb_address *addr;
3129         struct sadb_x_policy *pol;
3130         int sockaddr_size;
3131         int size;
3132         struct sadb_x_sec_ctx *sec_ctx;
3133         struct xfrm_sec_ctx *xfrm_ctx;
3134         int ctx_size = 0;
3135
3136         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3137         if (!sockaddr_size)
3138                 return -EINVAL;
3139
3140         size = sizeof(struct sadb_msg) +
3141                 (sizeof(struct sadb_address) * 2) +
3142                 (sockaddr_size * 2) +
3143                 sizeof(struct sadb_x_policy);
3144
3145         if (x->id.proto == IPPROTO_AH)
3146                 size += count_ah_combs(t);
3147         else if (x->id.proto == IPPROTO_ESP)
3148                 size += count_esp_combs(t);
3149
3150         if ((xfrm_ctx = x->security)) {
3151                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3152                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3153         }
3154
3155         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3156         if (skb == NULL)
3157                 return -ENOMEM;
3158
3159         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3160         hdr->sadb_msg_version = PF_KEY_V2;
3161         hdr->sadb_msg_type = SADB_ACQUIRE;
3162         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3163         hdr->sadb_msg_len = size / sizeof(uint64_t);
3164         hdr->sadb_msg_errno = 0;
3165         hdr->sadb_msg_reserved = 0;
3166         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3167         hdr->sadb_msg_pid = 0;
3168
3169         /* src address */
3170         addr = (struct sadb_address*) skb_put(skb,
3171                                               sizeof(struct sadb_address)+sockaddr_size);
3172         addr->sadb_address_len =
3173                 (sizeof(struct sadb_address)+sockaddr_size)/
3174                         sizeof(uint64_t);
3175         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3176         addr->sadb_address_proto = 0;
3177         addr->sadb_address_reserved = 0;
3178         addr->sadb_address_prefixlen =
3179                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3180                                     (struct sockaddr *) (addr + 1),
3181                                     x->props.family);
3182         if (!addr->sadb_address_prefixlen)
3183                 BUG();
3184
3185         /* dst address */
3186         addr = (struct sadb_address*) skb_put(skb,
3187                                               sizeof(struct sadb_address)+sockaddr_size);
3188         addr->sadb_address_len =
3189                 (sizeof(struct sadb_address)+sockaddr_size)/
3190                         sizeof(uint64_t);
3191         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3192         addr->sadb_address_proto = 0;
3193         addr->sadb_address_reserved = 0;
3194         addr->sadb_address_prefixlen =
3195                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3196                                     (struct sockaddr *) (addr + 1),
3197                                     x->props.family);
3198         if (!addr->sadb_address_prefixlen)
3199                 BUG();
3200
3201         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3202         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3203         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3204         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3205         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3206         pol->sadb_x_policy_reserved = 0;
3207         pol->sadb_x_policy_id = xp->index;
3208         pol->sadb_x_policy_priority = xp->priority;
3209
3210         /* Set sadb_comb's. */
3211         if (x->id.proto == IPPROTO_AH)
3212                 dump_ah_combs(skb, t);
3213         else if (x->id.proto == IPPROTO_ESP)
3214                 dump_esp_combs(skb, t);
3215
3216         /* security context */
3217         if (xfrm_ctx) {
3218                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3219                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3220                 sec_ctx->sadb_x_sec_len =
3221                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3222                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3223                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3224                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3225                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3226                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3227                        xfrm_ctx->ctx_len);
3228         }
3229
3230         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3231 }
3232
3233 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3234                                                 u8 *data, int len, int *dir)
3235 {
3236         struct net *net = sock_net(sk);
3237         struct xfrm_policy *xp;
3238         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3239         struct sadb_x_sec_ctx *sec_ctx;
3240
3241         switch (sk->sk_family) {
3242         case AF_INET:
3243                 if (opt != IP_IPSEC_POLICY) {
3244                         *dir = -EOPNOTSUPP;
3245                         return NULL;
3246                 }
3247                 break;
3248 #if IS_ENABLED(CONFIG_IPV6)
3249         case AF_INET6:
3250                 if (opt != IPV6_IPSEC_POLICY) {
3251                         *dir = -EOPNOTSUPP;
3252                         return NULL;
3253                 }
3254                 break;
3255 #endif
3256         default:
3257                 *dir = -EINVAL;
3258                 return NULL;
3259         }
3260
3261         *dir = -EINVAL;
3262
3263         if (len < sizeof(struct sadb_x_policy) ||
3264             pol->sadb_x_policy_len*8 > len ||
3265             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3266             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3267                 return NULL;
3268
3269         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3270         if (xp == NULL) {
3271                 *dir = -ENOBUFS;
3272                 return NULL;
3273         }
3274
3275         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3276                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3277
3278         xp->lft.soft_byte_limit = XFRM_INF;
3279         xp->lft.hard_byte_limit = XFRM_INF;
3280         xp->lft.soft_packet_limit = XFRM_INF;
3281         xp->lft.hard_packet_limit = XFRM_INF;
3282         xp->family = sk->sk_family;
3283
3284         xp->xfrm_nr = 0;
3285         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3286             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3287                 goto out;
3288
3289         /* security context too */
3290         if (len >= (pol->sadb_x_policy_len*8 +
3291             sizeof(struct sadb_x_sec_ctx))) {
3292                 char *p = (char *)pol;
3293                 struct xfrm_user_sec_ctx *uctx;
3294
3295                 p += pol->sadb_x_policy_len*8;
3296                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3297                 if (len < pol->sadb_x_policy_len*8 +
3298                     sec_ctx->sadb_x_sec_len*8) {
3299                         *dir = -EINVAL;
3300                         goto out;
3301                 }
3302                 if ((*dir = verify_sec_ctx_len(p)))
3303                         goto out;
3304                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3305                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3306                 kfree(uctx);
3307
3308                 if (*dir)
3309                         goto out;
3310         }
3311
3312         *dir = pol->sadb_x_policy_dir-1;
3313         return xp;
3314
3315 out:
3316         xp->walk.dead = 1;
3317         xfrm_policy_destroy(xp);
3318         return NULL;
3319 }
3320
3321 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3322 {
3323         struct sk_buff *skb;
3324         struct sadb_msg *hdr;
3325         struct sadb_sa *sa;
3326         struct sadb_address *addr;
3327         struct sadb_x_nat_t_port *n_port;
3328         int sockaddr_size;
3329         int size;
3330         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3331         struct xfrm_encap_tmpl *natt = NULL;
3332
3333         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3334         if (!sockaddr_size)
3335                 return -EINVAL;
3336
3337         if (!satype)
3338                 return -EINVAL;
3339
3340         if (!x->encap)
3341                 return -EINVAL;
3342
3343         natt = x->encap;
3344
3345         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3346          *
3347          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3348          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3349          */
3350
3351         size = sizeof(struct sadb_msg) +
3352                 sizeof(struct sadb_sa) +
3353                 (sizeof(struct sadb_address) * 2) +
3354                 (sockaddr_size * 2) +
3355                 (sizeof(struct sadb_x_nat_t_port) * 2);
3356
3357         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3358         if (skb == NULL)
3359                 return -ENOMEM;
3360
3361         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3362         hdr->sadb_msg_version = PF_KEY_V2;
3363         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3364         hdr->sadb_msg_satype = satype;
3365         hdr->sadb_msg_len = size / sizeof(uint64_t);
3366         hdr->sadb_msg_errno = 0;
3367         hdr->sadb_msg_reserved = 0;
3368         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3369         hdr->sadb_msg_pid = 0;
3370
3371         /* SA */
3372         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3373         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3374         sa->sadb_sa_exttype = SADB_EXT_SA;
3375         sa->sadb_sa_spi = x->id.spi;
3376         sa->sadb_sa_replay = 0;
3377         sa->sadb_sa_state = 0;
3378         sa->sadb_sa_auth = 0;
3379         sa->sadb_sa_encrypt = 0;
3380         sa->sadb_sa_flags = 0;
3381
3382         /* ADDRESS_SRC (old addr) */
3383         addr = (struct sadb_address*)
3384                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3385         addr->sadb_address_len =
3386                 (sizeof(struct sadb_address)+sockaddr_size)/
3387                         sizeof(uint64_t);
3388         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3389         addr->sadb_address_proto = 0;
3390         addr->sadb_address_reserved = 0;
3391         addr->sadb_address_prefixlen =
3392                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3393                                     (struct sockaddr *) (addr + 1),
3394                                     x->props.family);
3395         if (!addr->sadb_address_prefixlen)
3396                 BUG();
3397
3398         /* NAT_T_SPORT (old port) */
3399         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3400         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3401         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3402         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3403         n_port->sadb_x_nat_t_port_reserved = 0;
3404
3405         /* ADDRESS_DST (new addr) */
3406         addr = (struct sadb_address*)
3407                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3408         addr->sadb_address_len =
3409                 (sizeof(struct sadb_address)+sockaddr_size)/
3410                         sizeof(uint64_t);
3411         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3412         addr->sadb_address_proto = 0;
3413         addr->sadb_address_reserved = 0;
3414         addr->sadb_address_prefixlen =
3415                 pfkey_sockaddr_fill(ipaddr, 0,
3416                                     (struct sockaddr *) (addr + 1),
3417                                     x->props.family);
3418         if (!addr->sadb_address_prefixlen)
3419                 BUG();
3420
3421         /* NAT_T_DPORT (new port) */
3422         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3423         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3424         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3425         n_port->sadb_x_nat_t_port_port = sport;
3426         n_port->sadb_x_nat_t_port_reserved = 0;
3427
3428         return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x));
3429 }
3430
3431 #ifdef CONFIG_NET_KEY_MIGRATE
3432 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3433                             const struct xfrm_selector *sel)
3434 {
3435         struct sadb_address *addr;
3436         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3437         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3438         addr->sadb_address_exttype = type;
3439         addr->sadb_address_proto = sel->proto;
3440         addr->sadb_address_reserved = 0;
3441
3442         switch (type) {
3443         case SADB_EXT_ADDRESS_SRC:
3444                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3445                 pfkey_sockaddr_fill(&sel->saddr, 0,
3446                                     (struct sockaddr *)(addr + 1),
3447                                     sel->family);
3448                 break;
3449         case SADB_EXT_ADDRESS_DST:
3450                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3451                 pfkey_sockaddr_fill(&sel->daddr, 0,
3452                                     (struct sockaddr *)(addr + 1),
3453                                     sel->family);
3454                 break;
3455         default:
3456                 return -EINVAL;
3457         }
3458
3459         return 0;
3460 }
3461
3462
3463 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3464 {
3465         struct sadb_x_kmaddress *kma;
3466         u8 *sa;
3467         int family = k->family;
3468         int socklen = pfkey_sockaddr_len(family);
3469         int size_req;
3470
3471         size_req = (sizeof(struct sadb_x_kmaddress) +
3472                     pfkey_sockaddr_pair_size(family));
3473
3474         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3475         memset(kma, 0, size_req);
3476         kma->sadb_x_kmaddress_len = size_req / 8;
3477         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3478         kma->sadb_x_kmaddress_reserved = k->reserved;
3479
3480         sa = (u8 *)(kma + 1);
3481         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3482             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3483                 return -EINVAL;
3484
3485         return 0;
3486 }
3487
3488 static int set_ipsecrequest(struct sk_buff *skb,
3489                             uint8_t proto, uint8_t mode, int level,
3490                             uint32_t reqid, uint8_t family,
3491                             const xfrm_address_t *src, const xfrm_address_t *dst)
3492 {
3493         struct sadb_x_ipsecrequest *rq;
3494         u8 *sa;
3495         int socklen = pfkey_sockaddr_len(family);
3496         int size_req;
3497
3498         size_req = sizeof(struct sadb_x_ipsecrequest) +
3499                    pfkey_sockaddr_pair_size(family);
3500
3501         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3502         memset(rq, 0, size_req);
3503         rq->sadb_x_ipsecrequest_len = size_req;
3504         rq->sadb_x_ipsecrequest_proto = proto;
3505         rq->sadb_x_ipsecrequest_mode = mode;
3506         rq->sadb_x_ipsecrequest_level = level;
3507         rq->sadb_x_ipsecrequest_reqid = reqid;
3508
3509         sa = (u8 *) (rq + 1);
3510         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3511             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3512                 return -EINVAL;
3513
3514         return 0;
3515 }
3516 #endif
3517
3518 #ifdef CONFIG_NET_KEY_MIGRATE
3519 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3520                               const struct xfrm_migrate *m, int num_bundles,
3521                               const struct xfrm_kmaddress *k)
3522 {
3523         int i;
3524         int sasize_sel;
3525         int size = 0;
3526         int size_pol = 0;
3527         struct sk_buff *skb;
3528         struct sadb_msg *hdr;
3529         struct sadb_x_policy *pol;
3530         const struct xfrm_migrate *mp;
3531
3532         if (type != XFRM_POLICY_TYPE_MAIN)
3533                 return 0;
3534
3535         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3536                 return -EINVAL;
3537
3538         if (k != NULL) {
3539                 /* addresses for KM */
3540                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3541                                      pfkey_sockaddr_pair_size(k->family));
3542         }
3543
3544         /* selector */
3545         sasize_sel = pfkey_sockaddr_size(sel->family);
3546         if (!sasize_sel)
3547                 return -EINVAL;
3548         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3549
3550         /* policy info */
3551         size_pol += sizeof(struct sadb_x_policy);
3552
3553         /* ipsecrequests */
3554         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3555                 /* old locator pair */
3556                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3557                             pfkey_sockaddr_pair_size(mp->old_family);
3558                 /* new locator pair */
3559                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3560                             pfkey_sockaddr_pair_size(mp->new_family);
3561         }
3562
3563         size += sizeof(struct sadb_msg) + size_pol;
3564
3565         /* alloc buffer */
3566         skb = alloc_skb(size, GFP_ATOMIC);
3567         if (skb == NULL)
3568                 return -ENOMEM;
3569
3570         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3571         hdr->sadb_msg_version = PF_KEY_V2;
3572         hdr->sadb_msg_type = SADB_X_MIGRATE;
3573         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3574         hdr->sadb_msg_len = size / 8;
3575         hdr->sadb_msg_errno = 0;
3576         hdr->sadb_msg_reserved = 0;
3577         hdr->sadb_msg_seq = 0;
3578         hdr->sadb_msg_pid = 0;
3579
3580         /* Addresses to be used by KM for negotiation, if ext is available */
3581         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3582                 goto err;
3583
3584         /* selector src */
3585         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3586
3587         /* selector dst */
3588         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3589
3590         /* policy information */
3591         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3592         pol->sadb_x_policy_len = size_pol / 8;
3593         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3594         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3595         pol->sadb_x_policy_dir = dir + 1;
3596         pol->sadb_x_policy_reserved = 0;
3597         pol->sadb_x_policy_id = 0;
3598         pol->sadb_x_policy_priority = 0;
3599
3600         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3601                 /* old ipsecrequest */
3602                 int mode = pfkey_mode_from_xfrm(mp->mode);
3603                 if (mode < 0)
3604                         goto err;
3605                 if (set_ipsecrequest(skb, mp->proto, mode,
3606                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3607                                      mp->reqid, mp->old_family,
3608                                      &mp->old_saddr, &mp->old_daddr) < 0)
3609                         goto err;
3610
3611                 /* new ipsecrequest */
3612                 if (set_ipsecrequest(skb, mp->proto, mode,
3613                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3614                                      mp->reqid, mp->new_family,
3615                                      &mp->new_saddr, &mp->new_daddr) < 0)
3616                         goto err;
3617         }
3618
3619         /* broadcast migrate message to sockets */
3620         pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net);
3621
3622         return 0;
3623
3624 err:
3625         kfree_skb(skb);
3626         return -EINVAL;
3627 }
3628 #else
3629 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3630                               const struct xfrm_migrate *m, int num_bundles,
3631                               const struct xfrm_kmaddress *k)
3632 {
3633         return -ENOPROTOOPT;
3634 }
3635 #endif
3636
3637 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3638 {
3639         struct sock *sk = sock->sk;
3640         struct sk_buff *skb = NULL;
3641         struct sadb_msg *hdr = NULL;
3642         int err;
3643         struct net *net = sock_net(sk);
3644
3645         err = -EOPNOTSUPP;
3646         if (msg->msg_flags & MSG_OOB)
3647                 goto out;
3648
3649         err = -EMSGSIZE;
3650         if ((unsigned int)len > sk->sk_sndbuf - 32)
3651                 goto out;
3652
3653         err = -ENOBUFS;
3654         skb = alloc_skb(len, GFP_KERNEL);
3655         if (skb == NULL)
3656                 goto out;
3657
3658         err = -EFAULT;
3659         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3660                 goto out;
3661
3662         hdr = pfkey_get_base_msg(skb, &err);
3663         if (!hdr)
3664                 goto out;
3665
3666         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3667         err = pfkey_process(sk, skb, hdr);
3668         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3669
3670 out:
3671         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3672                 err = 0;
3673         kfree_skb(skb);
3674
3675         return err ? : len;
3676 }
3677
3678 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3679                          int flags)
3680 {
3681         struct sock *sk = sock->sk;
3682         struct pfkey_sock *pfk = pfkey_sk(sk);
3683         struct sk_buff *skb;
3684         int copied, err;
3685
3686         err = -EINVAL;
3687         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3688                 goto out;
3689
3690         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3691         if (skb == NULL)
3692                 goto out;
3693
3694         copied = skb->len;
3695         if (copied > len) {
3696                 msg->msg_flags |= MSG_TRUNC;
3697                 copied = len;
3698         }
3699
3700         skb_reset_transport_header(skb);
3701         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3702         if (err)
3703                 goto out_free;
3704
3705         sock_recv_ts_and_drops(msg, sk, skb);
3706
3707         err = (flags & MSG_TRUNC) ? skb->len : copied;
3708
3709         if (pfk->dump.dump != NULL &&
3710             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3711                 pfkey_do_dump(pfk);
3712
3713 out_free:
3714         skb_free_datagram(sk, skb);
3715 out:
3716         return err;
3717 }
3718
3719 static const struct proto_ops pfkey_ops = {
3720         .family         =       PF_KEY,
3721         .owner          =       THIS_MODULE,
3722         /* Operations that make no sense on pfkey sockets. */
3723         .bind           =       sock_no_bind,
3724         .connect        =       sock_no_connect,
3725         .socketpair     =       sock_no_socketpair,
3726         .accept         =       sock_no_accept,
3727         .getname        =       sock_no_getname,
3728         .ioctl          =       sock_no_ioctl,
3729         .listen         =       sock_no_listen,
3730         .shutdown       =       sock_no_shutdown,
3731         .setsockopt     =       sock_no_setsockopt,
3732         .getsockopt     =       sock_no_getsockopt,
3733         .mmap           =       sock_no_mmap,
3734         .sendpage       =       sock_no_sendpage,
3735
3736         /* Now the operations that really occur. */
3737         .release        =       pfkey_release,
3738         .poll           =       datagram_poll,
3739         .sendmsg        =       pfkey_sendmsg,
3740         .recvmsg        =       pfkey_recvmsg,
3741 };
3742
3743 static const struct net_proto_family pfkey_family_ops = {
3744         .family =       PF_KEY,
3745         .create =       pfkey_create,
3746         .owner  =       THIS_MODULE,
3747 };
3748
3749 #ifdef CONFIG_PROC_FS
3750 static int pfkey_seq_show(struct seq_file *f, void *v)
3751 {
3752         struct sock *s = sk_entry(v);
3753
3754         if (v == SEQ_START_TOKEN)
3755                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3756         else
3757                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3758                                s,
3759                                atomic_read(&s->sk_refcnt),
3760                                sk_rmem_alloc_get(s),
3761                                sk_wmem_alloc_get(s),
3762                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3763                                sock_i_ino(s)
3764                                );
3765         return 0;
3766 }
3767
3768 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3769         __acquires(rcu)
3770 {
3771         struct net *net = seq_file_net(f);
3772         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3773
3774         rcu_read_lock();
3775         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3776 }
3777
3778 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3779 {
3780         struct net *net = seq_file_net(f);
3781         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3782
3783         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3784 }
3785
3786 static void pfkey_seq_stop(struct seq_file *f, void *v)
3787         __releases(rcu)
3788 {
3789         rcu_read_unlock();
3790 }
3791
3792 static const struct seq_operations pfkey_seq_ops = {
3793         .start  = pfkey_seq_start,
3794         .next   = pfkey_seq_next,
3795         .stop   = pfkey_seq_stop,
3796         .show   = pfkey_seq_show,
3797 };
3798
3799 static int pfkey_seq_open(struct inode *inode, struct file *file)
3800 {
3801         return seq_open_net(inode, file, &pfkey_seq_ops,
3802                             sizeof(struct seq_net_private));
3803 }
3804
3805 static const struct file_operations pfkey_proc_ops = {
3806         .open    = pfkey_seq_open,
3807         .read    = seq_read,
3808         .llseek  = seq_lseek,
3809         .release = seq_release_net,
3810 };
3811
3812 static int __net_init pfkey_init_proc(struct net *net)
3813 {
3814         struct proc_dir_entry *e;
3815
3816         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3817         if (e == NULL)
3818                 return -ENOMEM;
3819
3820         return 0;
3821 }
3822
3823 static void __net_exit pfkey_exit_proc(struct net *net)
3824 {
3825         remove_proc_entry("pfkey", net->proc_net);
3826 }
3827 #else
3828 static inline int pfkey_init_proc(struct net *net)
3829 {
3830         return 0;
3831 }
3832
3833 static inline void pfkey_exit_proc(struct net *net)
3834 {
3835 }
3836 #endif
3837
3838 static struct xfrm_mgr pfkeyv2_mgr =
3839 {
3840         .notify         = pfkey_send_notify,
3841         .acquire        = pfkey_send_acquire,
3842         .compile_policy = pfkey_compile_policy,
3843         .new_mapping    = pfkey_send_new_mapping,
3844         .notify_policy  = pfkey_send_policy_notify,
3845         .migrate        = pfkey_send_migrate,
3846         .is_alive       = pfkey_is_alive,
3847 };
3848
3849 static int __net_init pfkey_net_init(struct net *net)
3850 {
3851         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3852         int rv;
3853
3854         INIT_HLIST_HEAD(&net_pfkey->table);
3855         atomic_set(&net_pfkey->socks_nr, 0);
3856
3857         rv = pfkey_init_proc(net);
3858
3859         return rv;
3860 }
3861
3862 static void __net_exit pfkey_net_exit(struct net *net)
3863 {
3864         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3865
3866         pfkey_exit_proc(net);
3867         BUG_ON(!hlist_empty(&net_pfkey->table));
3868 }
3869
3870 static struct pernet_operations pfkey_net_ops = {
3871         .init = pfkey_net_init,
3872         .exit = pfkey_net_exit,
3873         .id   = &pfkey_net_id,
3874         .size = sizeof(struct netns_pfkey),
3875 };
3876
3877 static void __exit ipsec_pfkey_exit(void)
3878 {
3879         xfrm_unregister_km(&pfkeyv2_mgr);
3880         sock_unregister(PF_KEY);
3881         unregister_pernet_subsys(&pfkey_net_ops);
3882         proto_unregister(&key_proto);
3883 }
3884
3885 static int __init ipsec_pfkey_init(void)
3886 {
3887         int err = proto_register(&key_proto, 0);
3888
3889         if (err != 0)
3890                 goto out;
3891
3892         err = register_pernet_subsys(&pfkey_net_ops);
3893         if (err != 0)
3894                 goto out_unregister_key_proto;
3895         err = sock_register(&pfkey_family_ops);
3896         if (err != 0)
3897                 goto out_unregister_pernet;
3898         err = xfrm_register_km(&pfkeyv2_mgr);
3899         if (err != 0)
3900                 goto out_sock_unregister;
3901 out:
3902         return err;
3903
3904 out_sock_unregister:
3905         sock_unregister(PF_KEY);
3906 out_unregister_pernet:
3907         unregister_pernet_subsys(&pfkey_net_ops);
3908 out_unregister_key_proto:
3909         proto_unregister(&key_proto);
3910         goto out;
3911 }
3912
3913 module_init(ipsec_pfkey_init);
3914 module_exit(ipsec_pfkey_exit);
3915 MODULE_LICENSE("GPL");
3916 MODULE_ALIAS_NETPROTO(PF_KEY);