net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static const struct xfrm_mark dummy_mark = {0, 0};
  49 struct pfkey_sock {
  50         /* struct sock must be the first member of struct pfkey_sock */
  51         struct sock     sk;
  52         int             registered;
  53         int             promisc;
  54
  55         struct {
  56                 uint8_t         msg_version;
  57                 uint32_t        msg_portid;
  58                 int             (*dump)(struct pfkey_sock *sk);
  59                 void            (*done)(struct pfkey_sock *sk);
  60                 union {
  61                         struct xfrm_policy_walk policy;
  62                         struct xfrm_state_walk  state;
  63                 } u;
  64                 struct sk_buff  *skb;
  65         } dump;
  66         struct mutex dump_lock;
  67 };
  68
  69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
  70                                xfrm_address_t *saddr, xfrm_address_t *daddr,
  71                                u16 *family);
  72
  73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  74 {
  75         return (struct pfkey_sock *)sk;
  76 }
  77
  78 static int pfkey_can_dump(const struct sock *sk)
  79 {
  80         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  81                 return 1;
  82         return 0;
  83 }
  84
  85 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  86 {
  87         if (pfk->dump.dump) {
  88                 if (pfk->dump.skb) {
  89                         kfree_skb(pfk->dump.skb);
  90                         pfk->dump.skb = NULL;
  91                 }
  92                 pfk->dump.done(pfk);
  93                 pfk->dump.dump = NULL;
  94                 pfk->dump.done = NULL;
  95         }
  96 }
  97
  98 static void pfkey_sock_destruct(struct sock *sk)
  99 {
 100         struct net *net = sock_net(sk);
 101         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 102
 103         pfkey_terminate_dump(pfkey_sk(sk));
 104         skb_queue_purge(&sk->sk_receive_queue);
 105
 106         if (!sock_flag(sk, SOCK_DEAD)) {
 107                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 108                 return;
 109         }
 110
 111         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 112         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 113
 114         atomic_dec(&net_pfkey->socks_nr);
 115 }
 116
 117 static const struct proto_ops pfkey_ops;
 118
 119 static void pfkey_insert(struct sock *sk)
 120 {
 121         struct net *net = sock_net(sk);
 122         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 123
 124         mutex_lock(&pfkey_mutex);
 125         sk_add_node_rcu(sk, &net_pfkey->table);
 126         mutex_unlock(&pfkey_mutex);
 127 }
 128
 129 static void pfkey_remove(struct sock *sk)
 130 {
 131         mutex_lock(&pfkey_mutex);
 132         sk_del_node_init_rcu(sk);
 133         mutex_unlock(&pfkey_mutex);
 134 }
 135
 136 static struct proto key_proto = {
 137         .name     = "KEY",
 138         .owner    = THIS_MODULE,
 139         .obj_size = sizeof(struct pfkey_sock),
 140 };
 141
 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 143                         int kern)
 144 {
 145         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 146         struct sock *sk;
 147         struct pfkey_sock *pfk;
 148         int err;
 149
 150         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 151                 return -EPERM;
 152         if (sock->type != SOCK_RAW)
 153                 return -ESOCKTNOSUPPORT;
 154         if (protocol != PF_KEY_V2)
 155                 return -EPROTONOSUPPORT;
 156
 157         err = -ENOMEM;
 158         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 159         if (sk == NULL)
 160                 goto out;
 161
 162         pfk = pfkey_sk(sk);
 163         mutex_init(&pfk->dump_lock);
 164
 165         sock->ops = &pfkey_ops;
 166         sock_init_data(sock, sk);
 167
 168         sk->sk_family = PF_KEY;
 169         sk->sk_destruct = pfkey_sock_destruct;
 170
 171         atomic_inc(&net_pfkey->socks_nr);
 172
 173         pfkey_insert(sk);
 174
 175         return 0;
 176 out:
 177         return err;
 178 }
 179
 180 static int pfkey_release(struct socket *sock)
 181 {
 182         struct sock *sk = sock->sk;
 183
 184         if (!sk)
 185                 return 0;
 186
 187         pfkey_remove(sk);
 188
 189         sock_orphan(sk);
 190         sock->sk = NULL;
 191         skb_queue_purge(&sk->sk_write_queue);
 192
 193         synchronize_rcu();
 194         sock_put(sk);
 195
 196         return 0;
 197 }
 198
 199 static int pfkey_broadcast_one(struct sk_buff *skb, 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, gfp_t allocation,
 232                            int broadcast_flags, struct sock *one_sk,
 233                            struct net *net)
 234 {
 235         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 236         struct sock *sk;
 237         struct sk_buff *skb2 = NULL;
 238         int err = -ESRCH;
 239
 240         /* XXX Do we need something like netlink_overrun?  I think
 241          * XXX PF_KEY socket apps will not mind current behavior.
 242          */
 243         if (!skb)
 244                 return -ENOMEM;
 245
 246         rcu_read_lock();
 247         sk_for_each_rcu(sk, &net_pfkey->table) {
 248                 struct pfkey_sock *pfk = pfkey_sk(sk);
 249                 int err2;
 250
 251                 /* Yes, it means that if you are meant to receive this
 252                  * pfkey message you receive it twice as promiscuous
 253                  * socket.
 254                  */
 255                 if (pfk->promisc)
 256                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 257
 258                 /* the exact target will be processed later */
 259                 if (sk == one_sk)
 260                         continue;
 261                 if (broadcast_flags != BROADCAST_ALL) {
 262                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 263                                 continue;
 264                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 265                             !pfk->registered)
 266                                 continue;
 267                         if (broadcast_flags & BROADCAST_ONE)
 268                                 continue;
 269                 }
 270
 271                 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 272
 273                 /* Error is cleared after successful sending to at least one
 274                  * registered KM */
 275                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 276                         err = err2;
 277         }
 278         rcu_read_unlock();
 279
 280         if (one_sk != NULL)
 281                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 282
 283         kfree_skb(skb2);
 284         kfree_skb(skb);
 285         return err;
 286 }
 287
 288 static int pfkey_do_dump(struct pfkey_sock *pfk)
 289 {
 290         struct sadb_msg *hdr;
 291         int rc;
 292
 293         mutex_lock(&pfk->dump_lock);
 294         if (!pfk->dump.dump) {
 295                 rc = 0;
 296                 goto out;
 297         }
 298
 299         rc = pfk->dump.dump(pfk);
 300         if (rc == -ENOBUFS) {
 301                 rc = 0;
 302                 goto out;
 303         }
 304
 305         if (pfk->dump.skb) {
 306                 if (!pfkey_can_dump(&pfk->sk)) {
 307                         rc = 0;
 308                         goto out;
 309                 }
 310
 311                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 312                 hdr->sadb_msg_seq = 0;
 313                 hdr->sadb_msg_errno = rc;
 314                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 315                                 &pfk->sk, sock_net(&pfk->sk));
 316                 pfk->dump.skb = NULL;
 317         }
 318
 319         pfkey_terminate_dump(pfk);
 320
 321 out:
 322         mutex_unlock(&pfk->dump_lock);
 323         return rc;
 324 }
 325
 326 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 327                                  const struct sadb_msg *orig)
 328 {
 329         *new = *orig;
 330 }
 331
 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 333 {
 334         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 335         struct sadb_msg *hdr;
 336
 337         if (!skb)
 338                 return -ENOBUFS;
 339
 340         /* Woe be to the platform trying to support PFKEY yet
 341          * having normal errnos outside the 1-255 range, inclusive.
 342          */
 343         err = -err;
 344         if (err == ERESTARTSYS ||
 345             err == ERESTARTNOHAND ||
 346             err == ERESTARTNOINTR)
 347                 err = EINTR;
 348         if (err >= 512)
 349                 err = EINVAL;
 350         BUG_ON(err <= 0 || err >= 256);
 351
 352         hdr = (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, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 359
 360         return 0;
 361 }
 362
 363 static const u8 sadb_ext_min_len[] = {
 364         [SADB_EXT_RESERVED]             = (u8) 0,
 365         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 366         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 367         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 368         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 369         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 370         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 371         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 372         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 373         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 374         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 375         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 376         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 377         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 378         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 379         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 380         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 381         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 382         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 383         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 384         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 385         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 386         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 387         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 388         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 389         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 390         [SADB_X_EXT_FILTER]             = (u8) sizeof(struct sadb_x_filter),
 391 };
 392
 393 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 394 static int verify_address_len(const void *p)
 395 {
 396         const struct sadb_address *sp = p;
 397         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 398         const struct sockaddr_in *sin;
 399 #if IS_ENABLED(CONFIG_IPV6)
 400         const struct sockaddr_in6 *sin6;
 401 #endif
 402         int len;
 403
 404         if (sp->sadb_address_len <
 405             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 406                          sizeof(uint64_t)))
 407                 return -EINVAL;
 408
 409         switch (addr->sa_family) {
 410         case AF_INET:
 411                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 412                 if (sp->sadb_address_len != len ||
 413                     sp->sadb_address_prefixlen > 32)
 414                         return -EINVAL;
 415                 break;
 416 #if IS_ENABLED(CONFIG_IPV6)
 417         case AF_INET6:
 418                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 419                 if (sp->sadb_address_len != len ||
 420                     sp->sadb_address_prefixlen > 128)
 421                         return -EINVAL;
 422                 break;
 423 #endif
 424         default:
 425                 /* It is user using kernel to keep track of security
 426                  * associations for another protocol, such as
 427                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 428                  * lengths.
 429                  *
 430                  * XXX Actually, association/policy database is not yet
 431                  * XXX able to cope with arbitrary sockaddr families.
 432                  * XXX When it can, remove this -EINVAL.  -DaveM
 433                  */
 434                 return -EINVAL;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static inline int sadb_key_len(const struct sadb_key *key)
 441 {
 442         int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8);
 443
 444         return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes,
 445                             sizeof(uint64_t));
 446 }
 447
 448 static int verify_key_len(const void *p)
 449 {
 450         const struct sadb_key *key = p;
 451
 452         if (sadb_key_len(key) > key->sadb_key_len)
 453                 return -EINVAL;
 454
 455         return 0;
 456 }
 457
 458 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 459 {
 460         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 461                             sec_ctx->sadb_x_ctx_len,
 462                             sizeof(uint64_t));
 463 }
 464
 465 static inline int verify_sec_ctx_len(const void *p)
 466 {
 467         const struct sadb_x_sec_ctx *sec_ctx = p;
 468         int len = sec_ctx->sadb_x_ctx_len;
 469
 470         if (len > PAGE_SIZE)
 471                 return -EINVAL;
 472
 473         len = pfkey_sec_ctx_len(sec_ctx);
 474
 475         if (sec_ctx->sadb_x_sec_len != len)
 476                 return -EINVAL;
 477
 478         return 0;
 479 }
 480
 481 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx,
 482                                                                      gfp_t gfp)
 483 {
 484         struct xfrm_user_sec_ctx *uctx = NULL;
 485         int ctx_size = sec_ctx->sadb_x_ctx_len;
 486
 487         uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp);
 488
 489         if (!uctx)
 490                 return NULL;
 491
 492         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 493         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 494         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 495         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 496         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 497         memcpy(uctx + 1, sec_ctx + 1,
 498                uctx->ctx_len);
 499
 500         return uctx;
 501 }
 502
 503 static int present_and_same_family(const struct sadb_address *src,
 504                                    const struct sadb_address *dst)
 505 {
 506         const struct sockaddr *s_addr, *d_addr;
 507
 508         if (!src || !dst)
 509                 return 0;
 510
 511         s_addr = (const struct sockaddr *)(src + 1);
 512         d_addr = (const struct sockaddr *)(dst + 1);
 513         if (s_addr->sa_family != d_addr->sa_family)
 514                 return 0;
 515         if (s_addr->sa_family != AF_INET
 516 #if IS_ENABLED(CONFIG_IPV6)
 517             && s_addr->sa_family != AF_INET6
 518 #endif
 519                 )
 520                 return 0;
 521
 522         return 1;
 523 }
 524
 525 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 526 {
 527         const char *p = (char *) hdr;
 528         int len = skb->len;
 529
 530         len -= sizeof(*hdr);
 531         p += sizeof(*hdr);
 532         while (len > 0) {
 533                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 534                 uint16_t ext_type;
 535                 int ext_len;
 536
 537                 if (len < sizeof(*ehdr))
 538                         return -EINVAL;
 539
 540                 ext_len  = ehdr->sadb_ext_len;
 541                 ext_len *= sizeof(uint64_t);
 542                 ext_type = ehdr->sadb_ext_type;
 543                 if (ext_len < sizeof(uint64_t) ||
 544                     ext_len > len ||
 545                     ext_type == SADB_EXT_RESERVED)
 546                         return -EINVAL;
 547
 548                 if (ext_type <= SADB_EXT_MAX) {
 549                         int min = (int) sadb_ext_min_len[ext_type];
 550                         if (ext_len < min)
 551                                 return -EINVAL;
 552                         if (ext_hdrs[ext_type-1] != NULL)
 553                                 return -EINVAL;
 554                         switch (ext_type) {
 555                         case SADB_EXT_ADDRESS_SRC:
 556                         case SADB_EXT_ADDRESS_DST:
 557                         case SADB_EXT_ADDRESS_PROXY:
 558                         case SADB_X_EXT_NAT_T_OA:
 559                                 if (verify_address_len(p))
 560                                         return -EINVAL;
 561                                 break;
 562                         case SADB_X_EXT_SEC_CTX:
 563                                 if (verify_sec_ctx_len(p))
 564                                         return -EINVAL;
 565                                 break;
 566                         case SADB_EXT_KEY_AUTH:
 567                         case SADB_EXT_KEY_ENCRYPT:
 568                                 if (verify_key_len(p))
 569                                         return -EINVAL;
 570                                 break;
 571                         default:
 572                                 break;
 573                         }
 574                         ext_hdrs[ext_type-1] = (void *) p;
 575                 }
 576                 p   += ext_len;
 577                 len -= ext_len;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static uint16_t
 584 pfkey_satype2proto(uint8_t satype)
 585 {
 586         switch (satype) {
 587         case SADB_SATYPE_UNSPEC:
 588                 return IPSEC_PROTO_ANY;
 589         case SADB_SATYPE_AH:
 590                 return IPPROTO_AH;
 591         case SADB_SATYPE_ESP:
 592                 return IPPROTO_ESP;
 593         case SADB_X_SATYPE_IPCOMP:
 594                 return IPPROTO_COMP;
 595         default:
 596                 return 0;
 597         }
 598         /* NOTREACHED */
 599 }
 600
 601 static uint8_t
 602 pfkey_proto2satype(uint16_t proto)
 603 {
 604         switch (proto) {
 605         case IPPROTO_AH:
 606                 return SADB_SATYPE_AH;
 607         case IPPROTO_ESP:
 608                 return SADB_SATYPE_ESP;
 609         case IPPROTO_COMP:
 610                 return SADB_X_SATYPE_IPCOMP;
 611         default:
 612                 return 0;
 613         }
 614         /* NOTREACHED */
 615 }
 616
 617 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 618  * say specifically 'just raw sockets' as we encode them as 255.
 619  */
 620
 621 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 622 {
 623         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 624 }
 625
 626 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 627 {
 628         return proto ? proto : IPSEC_PROTO_ANY;
 629 }
 630
 631 static inline int pfkey_sockaddr_len(sa_family_t family)
 632 {
 633         switch (family) {
 634         case AF_INET:
 635                 return sizeof(struct sockaddr_in);
 636 #if IS_ENABLED(CONFIG_IPV6)
 637         case AF_INET6:
 638                 return sizeof(struct sockaddr_in6);
 639 #endif
 640         }
 641         return 0;
 642 }
 643
 644 static
 645 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 646 {
 647         switch (sa->sa_family) {
 648         case AF_INET:
 649                 xaddr->a4 =
 650                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 651                 return AF_INET;
 652 #if IS_ENABLED(CONFIG_IPV6)
 653         case AF_INET6:
 654                 memcpy(xaddr->a6,
 655                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 656                        sizeof(struct in6_addr));
 657                 return AF_INET6;
 658 #endif
 659         }
 660         return 0;
 661 }
 662
 663 static
 664 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 665 {
 666         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 667                                       xaddr);
 668 }
 669
 670 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 671 {
 672         const struct sadb_sa *sa;
 673         const struct sadb_address *addr;
 674         uint16_t proto;
 675         unsigned short family;
 676         xfrm_address_t *xaddr;
 677
 678         sa = ext_hdrs[SADB_EXT_SA - 1];
 679         if (sa == NULL)
 680                 return NULL;
 681
 682         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 683         if (proto == 0)
 684                 return NULL;
 685
 686         /* sadb_address_len should be checked by caller */
 687         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 688         if (addr == NULL)
 689                 return NULL;
 690
 691         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 692         switch (family) {
 693         case AF_INET:
 694                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 695                 break;
 696 #if IS_ENABLED(CONFIG_IPV6)
 697         case AF_INET6:
 698                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 699                 break;
 700 #endif
 701         default:
 702                 xaddr = NULL;
 703         }
 704
 705         if (!xaddr)
 706                 return NULL;
 707
 708         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 709 }
 710
 711 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 712
 713 static int
 714 pfkey_sockaddr_size(sa_family_t family)
 715 {
 716         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 717 }
 718
 719 static inline int pfkey_mode_from_xfrm(int mode)
 720 {
 721         switch(mode) {
 722         case XFRM_MODE_TRANSPORT:
 723                 return IPSEC_MODE_TRANSPORT;
 724         case XFRM_MODE_TUNNEL:
 725                 return IPSEC_MODE_TUNNEL;
 726         case XFRM_MODE_BEET:
 727                 return IPSEC_MODE_BEET;
 728         default:
 729                 return -1;
 730         }
 731 }
 732
 733 static inline int pfkey_mode_to_xfrm(int mode)
 734 {
 735         switch(mode) {
 736         case IPSEC_MODE_ANY:    /*XXX*/
 737         case IPSEC_MODE_TRANSPORT:
 738                 return XFRM_MODE_TRANSPORT;
 739         case IPSEC_MODE_TUNNEL:
 740                 return XFRM_MODE_TUNNEL;
 741         case IPSEC_MODE_BEET:
 742                 return XFRM_MODE_BEET;
 743         default:
 744                 return -1;
 745         }
 746 }
 747
 748 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 749                                         struct sockaddr *sa,
 750                                         unsigned short family)
 751 {
 752         switch (family) {
 753         case AF_INET:
 754             {
 755                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 756                 sin->sin_family = AF_INET;
 757                 sin->sin_port = port;
 758                 sin->sin_addr.s_addr = xaddr->a4;
 759                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 760                 return 32;
 761             }
 762 #if IS_ENABLED(CONFIG_IPV6)
 763         case AF_INET6:
 764             {
 765                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 766                 sin6->sin6_family = AF_INET6;
 767                 sin6->sin6_port = port;
 768                 sin6->sin6_flowinfo = 0;
 769                 sin6->sin6_addr = xaddr->in6;
 770                 sin6->sin6_scope_id = 0;
 771                 return 128;
 772             }
 773 #endif
 774         }
 775         return 0;
 776 }
 777
 778 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 779                                               int add_keys, int hsc)
 780 {
 781         struct sk_buff *skb;
 782         struct sadb_msg *hdr;
 783         struct sadb_sa *sa;
 784         struct sadb_lifetime *lifetime;
 785         struct sadb_address *addr;
 786         struct sadb_key *key;
 787         struct sadb_x_sa2 *sa2;
 788         struct sadb_x_sec_ctx *sec_ctx;
 789         struct xfrm_sec_ctx *xfrm_ctx;
 790         int ctx_size = 0;
 791         int size;
 792         int auth_key_size = 0;
 793         int encrypt_key_size = 0;
 794         int sockaddr_size;
 795         struct xfrm_encap_tmpl *natt = NULL;
 796         int mode;
 797
 798         /* address family check */
 799         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 800         if (!sockaddr_size)
 801                 return ERR_PTR(-EINVAL);
 802
 803         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 804            key(AE), (identity(SD),) (sensitivity)> */
 805         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 806                 sizeof(struct sadb_lifetime) +
 807                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 808                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 809                         sizeof(struct sadb_address)*2 +
 810                                 sockaddr_size*2 +
 811                                         sizeof(struct sadb_x_sa2);
 812
 813         if ((xfrm_ctx = x->security)) {
 814                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 815                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 816         }
 817
 818         /* identity & sensitivity */
 819         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 820                 size += sizeof(struct sadb_address) + sockaddr_size;
 821
 822         if (add_keys) {
 823                 if (x->aalg && x->aalg->alg_key_len) {
 824                         auth_key_size =
 825                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 826                         size += sizeof(struct sadb_key) + auth_key_size;
 827                 }
 828                 if (x->ealg && x->ealg->alg_key_len) {
 829                         encrypt_key_size =
 830                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 831                         size += sizeof(struct sadb_key) + encrypt_key_size;
 832                 }
 833         }
 834         if (x->encap)
 835                 natt = x->encap;
 836
 837         if (natt && natt->encap_type) {
 838                 size += sizeof(struct sadb_x_nat_t_type);
 839                 size += sizeof(struct sadb_x_nat_t_port);
 840                 size += sizeof(struct sadb_x_nat_t_port);
 841         }
 842
 843         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 844         if (skb == NULL)
 845                 return ERR_PTR(-ENOBUFS);
 846
 847         /* call should fill header later */
 848         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 849         memset(hdr, 0, size);   /* XXX do we need this ? */
 850         hdr->sadb_msg_len = size / sizeof(uint64_t);
 851
 852         /* sa */
 853         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 854         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 855         sa->sadb_sa_exttype = SADB_EXT_SA;
 856         sa->sadb_sa_spi = x->id.spi;
 857         sa->sadb_sa_replay = x->props.replay_window;
 858         switch (x->km.state) {
 859         case XFRM_STATE_VALID:
 860                 sa->sadb_sa_state = x->km.dying ?
 861                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 862                 break;
 863         case XFRM_STATE_ACQ:
 864                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 865                 break;
 866         default:
 867                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 868                 break;
 869         }
 870         sa->sadb_sa_auth = 0;
 871         if (x->aalg) {
 872                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 873                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 874                                         a->desc.sadb_alg_id : 0;
 875         }
 876         sa->sadb_sa_encrypt = 0;
 877         BUG_ON(x->ealg && x->calg);
 878         if (x->ealg) {
 879                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 880                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 881                                         a->desc.sadb_alg_id : 0;
 882         }
 883         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 884         if (x->calg) {
 885                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 886                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 887                                         a->desc.sadb_alg_id : 0;
 888         }
 889
 890         sa->sadb_sa_flags = 0;
 891         if (x->props.flags & XFRM_STATE_NOECN)
 892                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 893         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 894                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 895         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 896                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 897
 898         /* hard time */
 899         if (hsc & 2) {
 900                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 901                                                              sizeof(struct sadb_lifetime));
 902                 lifetime->sadb_lifetime_len =
 903                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 904                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 905                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 906                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 907                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 908                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 909         }
 910         /* soft time */
 911         if (hsc & 1) {
 912                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 913                                                              sizeof(struct sadb_lifetime));
 914                 lifetime->sadb_lifetime_len =
 915                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 916                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 917                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 918                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 919                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 920                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 921         }
 922         /* current time */
 923         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 924                                                      sizeof(struct sadb_lifetime));
 925         lifetime->sadb_lifetime_len =
 926                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 927         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 928         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 929         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 930         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 931         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 932         /* src address */
 933         addr = (struct sadb_address*) skb_put(skb,
 934                                               sizeof(struct sadb_address)+sockaddr_size);
 935         addr->sadb_address_len =
 936                 (sizeof(struct sadb_address)+sockaddr_size)/
 937                         sizeof(uint64_t);
 938         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 939         /* "if the ports are non-zero, then the sadb_address_proto field,
 940            normally zero, MUST be filled in with the transport
 941            protocol's number." - RFC2367 */
 942         addr->sadb_address_proto = 0;
 943         addr->sadb_address_reserved = 0;
 944
 945         addr->sadb_address_prefixlen =
 946                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 947                                     (struct sockaddr *) (addr + 1),
 948                                     x->props.family);
 949         if (!addr->sadb_address_prefixlen)
 950                 BUG();
 951
 952         /* dst address */
 953         addr = (struct sadb_address*) skb_put(skb,
 954                                               sizeof(struct sadb_address)+sockaddr_size);
 955         addr->sadb_address_len =
 956                 (sizeof(struct sadb_address)+sockaddr_size)/
 957                         sizeof(uint64_t);
 958         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 959         addr->sadb_address_proto = 0;
 960         addr->sadb_address_reserved = 0;
 961
 962         addr->sadb_address_prefixlen =
 963                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 964                                     (struct sockaddr *) (addr + 1),
 965                                     x->props.family);
 966         if (!addr->sadb_address_prefixlen)
 967                 BUG();
 968
 969         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 970                              x->props.family)) {
 971                 addr = (struct sadb_address*) skb_put(skb,
 972                         sizeof(struct sadb_address)+sockaddr_size);
 973                 addr->sadb_address_len =
 974                         (sizeof(struct sadb_address)+sockaddr_size)/
 975                         sizeof(uint64_t);
 976                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 977                 addr->sadb_address_proto =
 978                         pfkey_proto_from_xfrm(x->sel.proto);
 979                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 980                 addr->sadb_address_reserved = 0;
 981
 982                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 983                                     (struct sockaddr *) (addr + 1),
 984                                     x->props.family);
 985         }
 986
 987         /* auth key */
 988         if (add_keys && auth_key_size) {
 989                 key = (struct sadb_key *) skb_put(skb,
 990                                                   sizeof(struct sadb_key)+auth_key_size);
 991                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 992                         sizeof(uint64_t);
 993                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 994                 key->sadb_key_bits = x->aalg->alg_key_len;
 995                 key->sadb_key_reserved = 0;
 996                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 997         }
 998         /* encrypt key */
 999         if (add_keys && encrypt_key_size) {
1000                 key = (struct sadb_key *) skb_put(skb,
1001                                                   sizeof(struct sadb_key)+encrypt_key_size);
1002                 key->sadb_key_len = (sizeof(struct sadb_key) +
1003                                      encrypt_key_size) / sizeof(uint64_t);
1004                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
1005                 key->sadb_key_bits = x->ealg->alg_key_len;
1006                 key->sadb_key_reserved = 0;
1007                 memcpy(key + 1, x->ealg->alg_key,
1008                        (x->ealg->alg_key_len+7)/8);
1009         }
1010
1011         /* sa */
1012         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
1013         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
1014         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
1015         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
1016                 kfree_skb(skb);
1017                 return ERR_PTR(-EINVAL);
1018         }
1019         sa2->sadb_x_sa2_mode = mode;
1020         sa2->sadb_x_sa2_reserved1 = 0;
1021         sa2->sadb_x_sa2_reserved2 = 0;
1022         sa2->sadb_x_sa2_sequence = 0;
1023         sa2->sadb_x_sa2_reqid = x->props.reqid;
1024
1025         if (natt && natt->encap_type) {
1026                 struct sadb_x_nat_t_type *n_type;
1027                 struct sadb_x_nat_t_port *n_port;
1028
1029                 /* type */
1030                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1031                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1032                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1033                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1034                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1035                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1036                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1037
1038                 /* source port */
1039                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1040                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1041                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1042                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1043                 n_port->sadb_x_nat_t_port_reserved = 0;
1044
1045                 /* dest port */
1046                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1047                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1048                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1049                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1050                 n_port->sadb_x_nat_t_port_reserved = 0;
1051         }
1052
1053         /* security context */
1054         if (xfrm_ctx) {
1055                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1056                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1057                 sec_ctx->sadb_x_sec_len =
1058                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1059                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1060                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1061                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1062                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1063                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1064                        xfrm_ctx->ctx_len);
1065         }
1066
1067         return skb;
1068 }
1069
1070
1071 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1072 {
1073         struct sk_buff *skb;
1074
1075         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1076
1077         return skb;
1078 }
1079
1080 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1081                                                           int hsc)
1082 {
1083         return __pfkey_xfrm_state2msg(x, 0, hsc);
1084 }
1085
1086 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1087                                                 const struct sadb_msg *hdr,
1088                                                 void * const *ext_hdrs)
1089 {
1090         struct xfrm_state *x;
1091         const struct sadb_lifetime *lifetime;
1092         const struct sadb_sa *sa;
1093         const struct sadb_key *key;
1094         const struct sadb_x_sec_ctx *sec_ctx;
1095         uint16_t proto;
1096         int err;
1097
1098
1099         sa = ext_hdrs[SADB_EXT_SA - 1];
1100         if (!sa ||
1101             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1102                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1103                 return ERR_PTR(-EINVAL);
1104         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1105             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1106                 return ERR_PTR(-EINVAL);
1107         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1108             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1109                 return ERR_PTR(-EINVAL);
1110         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1111             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1112                 return ERR_PTR(-EINVAL);
1113
1114         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1115         if (proto == 0)
1116                 return ERR_PTR(-EINVAL);
1117
1118         /* default error is no buffer space */
1119         err = -ENOBUFS;
1120
1121         /* RFC2367:
1122
1123    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1124    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1125    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1126    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1127    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1128    not true.
1129
1130            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1131            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1132          */
1133         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1134             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1135              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1136             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1137                 return ERR_PTR(-EINVAL);
1138         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139         if (key != NULL &&
1140             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1141             key->sadb_key_bits == 0)
1142                 return ERR_PTR(-EINVAL);
1143         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1144         if (key != NULL &&
1145             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1146             key->sadb_key_bits == 0)
1147                 return ERR_PTR(-EINVAL);
1148
1149         x = xfrm_state_alloc(net);
1150         if (x == NULL)
1151                 return ERR_PTR(-ENOBUFS);
1152
1153         x->id.proto = proto;
1154         x->id.spi = sa->sadb_sa_spi;
1155         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1156                                         (sizeof(x->replay.bitmap) * 8));
1157         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1158                 x->props.flags |= XFRM_STATE_NOECN;
1159         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1160                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1161         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1162                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1163
1164         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1165         if (lifetime != NULL) {
1166                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1167                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1168                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1169                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1170         }
1171         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1172         if (lifetime != NULL) {
1173                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1174                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1175                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1176                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1177         }
1178
1179         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1180         if (sec_ctx != NULL) {
1181                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
1182
1183                 if (!uctx)
1184                         goto out;
1185
1186                 err = security_xfrm_state_alloc(x, uctx);
1187                 kfree(uctx);
1188
1189                 if (err)
1190                         goto out;
1191         }
1192
1193         err = -ENOBUFS;
1194         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1195         if (sa->sadb_sa_auth) {
1196                 int keysize = 0;
1197                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1198                 if (!a || !a->pfkey_supported) {
1199                         err = -ENOSYS;
1200                         goto out;
1201                 }
1202                 if (key)
1203                         keysize = (key->sadb_key_bits + 7) / 8;
1204                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1205                 if (!x->aalg) {
1206                         err = -ENOMEM;
1207                         goto out;
1208                 }
1209                 strcpy(x->aalg->alg_name, a->name);
1210                 x->aalg->alg_key_len = 0;
1211                 if (key) {
1212                         x->aalg->alg_key_len = key->sadb_key_bits;
1213                         memcpy(x->aalg->alg_key, key+1, keysize);
1214                 }
1215                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1216                 x->props.aalgo = sa->sadb_sa_auth;
1217                 /* x->algo.flags = sa->sadb_sa_flags; */
1218         }
1219         if (sa->sadb_sa_encrypt) {
1220                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1221                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1222                         if (!a || !a->pfkey_supported) {
1223                                 err = -ENOSYS;
1224                                 goto out;
1225                         }
1226                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1227                         if (!x->calg) {
1228                                 err = -ENOMEM;
1229                                 goto out;
1230                         }
1231                         strcpy(x->calg->alg_name, a->name);
1232                         x->props.calgo = sa->sadb_sa_encrypt;
1233                 } else {
1234                         int keysize = 0;
1235                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1236                         if (!a || !a->pfkey_supported) {
1237                                 err = -ENOSYS;
1238                                 goto out;
1239                         }
1240                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1241                         if (key)
1242                                 keysize = (key->sadb_key_bits + 7) / 8;
1243                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1244                         if (!x->ealg) {
1245                                 err = -ENOMEM;
1246                                 goto out;
1247                         }
1248                         strcpy(x->ealg->alg_name, a->name);
1249                         x->ealg->alg_key_len = 0;
1250                         if (key) {
1251                                 x->ealg->alg_key_len = key->sadb_key_bits;
1252                                 memcpy(x->ealg->alg_key, key+1, keysize);
1253                         }
1254                         x->props.ealgo = sa->sadb_sa_encrypt;
1255                         x->geniv = a->uinfo.encr.geniv;
1256                 }
1257         }
1258         /* x->algo.flags = sa->sadb_sa_flags; */
1259
1260         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1261                                                     &x->props.saddr);
1262         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1263                                   &x->id.daddr);
1264
1265         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1266                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1267                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1268                 if (mode < 0) {
1269                         err = -EINVAL;
1270                         goto out;
1271                 }
1272                 x->props.mode = mode;
1273                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1274         }
1275
1276         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1277                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1278
1279                 /* Nobody uses this, but we try. */
1280                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1281                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1282         }
1283
1284         if (!x->sel.family)
1285                 x->sel.family = x->props.family;
1286
1287         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1288                 const struct sadb_x_nat_t_type* n_type;
1289                 struct xfrm_encap_tmpl *natt;
1290
1291                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1292                 if (!x->encap) {
1293                         err = -ENOMEM;
1294                         goto out;
1295                 }
1296
1297                 natt = x->encap;
1298                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1299                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1300
1301                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1302                         const struct sadb_x_nat_t_port *n_port =
1303                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1304                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1305                 }
1306                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1307                         const struct sadb_x_nat_t_port *n_port =
1308                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1309                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1310                 }
1311                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1312         }
1313
1314         err = xfrm_init_state(x);
1315         if (err)
1316                 goto out;
1317
1318         x->km.seq = hdr->sadb_msg_seq;
1319         return x;
1320
1321 out:
1322         x->km.state = XFRM_STATE_DEAD;
1323         xfrm_state_put(x);
1324         return ERR_PTR(err);
1325 }
1326
1327 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1328 {
1329         return -EOPNOTSUPP;
1330 }
1331
1332 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1333 {
1334         struct net *net = sock_net(sk);
1335         struct sk_buff *resp_skb;
1336         struct sadb_x_sa2 *sa2;
1337         struct sadb_address *saddr, *daddr;
1338         struct sadb_msg *out_hdr;
1339         struct sadb_spirange *range;
1340         struct xfrm_state *x = NULL;
1341         int mode;
1342         int err;
1343         u32 min_spi, max_spi;
1344         u32 reqid;
1345         u8 proto;
1346         unsigned short family;
1347         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1348
1349         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1350                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1351                 return -EINVAL;
1352
1353         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1354         if (proto == 0)
1355                 return -EINVAL;
1356
1357         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1358                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1359                 if (mode < 0)
1360                         return -EINVAL;
1361                 reqid = sa2->sadb_x_sa2_reqid;
1362         } else {
1363                 mode = 0;
1364                 reqid = 0;
1365         }
1366
1367         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1368         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1369
1370         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1371         switch (family) {
1372         case AF_INET:
1373                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1374                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1375                 break;
1376 #if IS_ENABLED(CONFIG_IPV6)
1377         case AF_INET6:
1378                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1379                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1380                 break;
1381 #endif
1382         }
1383
1384         if (hdr->sadb_msg_seq) {
1385                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1386                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1387                         xfrm_state_put(x);
1388                         x = NULL;
1389                 }
1390         }
1391
1392         if (!x)
1393                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1394
1395         if (x == NULL)
1396                 return -ENOENT;
1397
1398         min_spi = 0x100;
1399         max_spi = 0x0fffffff;
1400
1401         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1402         if (range) {
1403                 min_spi = range->sadb_spirange_min;
1404                 max_spi = range->sadb_spirange_max;
1405         }
1406
1407         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1408         if (err) {
1409                 xfrm_state_put(x);
1410                 return err;
1411         }
1412
1413         err = xfrm_alloc_spi(x, min_spi, max_spi);
1414         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1415
1416         if (IS_ERR(resp_skb)) {
1417                 xfrm_state_put(x);
1418                 return  PTR_ERR(resp_skb);
1419         }
1420
1421         out_hdr = (struct sadb_msg *) resp_skb->data;
1422         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1423         out_hdr->sadb_msg_type = SADB_GETSPI;
1424         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1425         out_hdr->sadb_msg_errno = 0;
1426         out_hdr->sadb_msg_reserved = 0;
1427         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1428         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1429
1430         xfrm_state_put(x);
1431
1432         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1433
1434         return 0;
1435 }
1436
1437 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1438 {
1439         struct net *net = sock_net(sk);
1440         struct xfrm_state *x;
1441
1442         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1443                 return -EOPNOTSUPP;
1444
1445         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1446                 return 0;
1447
1448         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1449         if (x == NULL)
1450                 return 0;
1451
1452         spin_lock_bh(&x->lock);
1453         if (x->km.state == XFRM_STATE_ACQ)
1454                 x->km.state = XFRM_STATE_ERROR;
1455
1456         spin_unlock_bh(&x->lock);
1457         xfrm_state_put(x);
1458         return 0;
1459 }
1460
1461 static inline int event2poltype(int event)
1462 {
1463         switch (event) {
1464         case XFRM_MSG_DELPOLICY:
1465                 return SADB_X_SPDDELETE;
1466         case XFRM_MSG_NEWPOLICY:
1467                 return SADB_X_SPDADD;
1468         case XFRM_MSG_UPDPOLICY:
1469                 return SADB_X_SPDUPDATE;
1470         case XFRM_MSG_POLEXPIRE:
1471         //      return SADB_X_SPDEXPIRE;
1472         default:
1473                 pr_err("pfkey: Unknown policy event %d\n", event);
1474                 break;
1475         }
1476
1477         return 0;
1478 }
1479
1480 static inline int event2keytype(int event)
1481 {
1482         switch (event) {
1483         case XFRM_MSG_DELSA:
1484                 return SADB_DELETE;
1485         case XFRM_MSG_NEWSA:
1486                 return SADB_ADD;
1487         case XFRM_MSG_UPDSA:
1488                 return SADB_UPDATE;
1489         case XFRM_MSG_EXPIRE:
1490                 return SADB_EXPIRE;
1491         default:
1492                 pr_err("pfkey: Unknown SA event %d\n", event);
1493                 break;
1494         }
1495
1496         return 0;
1497 }
1498
1499 /* ADD/UPD/DEL */
1500 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1501 {
1502         struct sk_buff *skb;
1503         struct sadb_msg *hdr;
1504
1505         skb = pfkey_xfrm_state2msg(x);
1506
1507         if (IS_ERR(skb))
1508                 return PTR_ERR(skb);
1509
1510         hdr = (struct sadb_msg *) skb->data;
1511         hdr->sadb_msg_version = PF_KEY_V2;
1512         hdr->sadb_msg_type = event2keytype(c->event);
1513         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1514         hdr->sadb_msg_errno = 0;
1515         hdr->sadb_msg_reserved = 0;
1516         hdr->sadb_msg_seq = c->seq;
1517         hdr->sadb_msg_pid = c->portid;
1518
1519         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1520
1521         return 0;
1522 }
1523
1524 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1525 {
1526         struct net *net = sock_net(sk);
1527         struct xfrm_state *x;
1528         int err;
1529         struct km_event c;
1530
1531         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1532         if (IS_ERR(x))
1533                 return PTR_ERR(x);
1534
1535         xfrm_state_hold(x);
1536         if (hdr->sadb_msg_type == SADB_ADD)
1537                 err = xfrm_state_add(x);
1538         else
1539                 err = xfrm_state_update(x);
1540
1541         xfrm_audit_state_add(x, err ? 0 : 1, true);
1542
1543         if (err < 0) {
1544                 x->km.state = XFRM_STATE_DEAD;
1545                 __xfrm_state_put(x);
1546                 goto out;
1547         }
1548
1549         if (hdr->sadb_msg_type == SADB_ADD)
1550                 c.event = XFRM_MSG_NEWSA;
1551         else
1552                 c.event = XFRM_MSG_UPDSA;
1553         c.seq = hdr->sadb_msg_seq;
1554         c.portid = hdr->sadb_msg_pid;
1555         km_state_notify(x, &c);
1556 out:
1557         xfrm_state_put(x);
1558         return err;
1559 }
1560
1561 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1562 {
1563         struct net *net = sock_net(sk);
1564         struct xfrm_state *x;
1565         struct km_event c;
1566         int err;
1567
1568         if (!ext_hdrs[SADB_EXT_SA-1] ||
1569             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1570                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1571                 return -EINVAL;
1572
1573         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1574         if (x == NULL)
1575                 return -ESRCH;
1576
1577         if ((err = security_xfrm_state_delete(x)))
1578                 goto out;
1579
1580         if (xfrm_state_kern(x)) {
1581                 err = -EPERM;
1582                 goto out;
1583         }
1584
1585         err = xfrm_state_delete(x);
1586
1587         if (err < 0)
1588                 goto out;
1589
1590         c.seq = hdr->sadb_msg_seq;
1591         c.portid = hdr->sadb_msg_pid;
1592         c.event = XFRM_MSG_DELSA;
1593         km_state_notify(x, &c);
1594 out:
1595         xfrm_audit_state_delete(x, err ? 0 : 1, true);
1596         xfrm_state_put(x);
1597
1598         return err;
1599 }
1600
1601 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1602 {
1603         struct net *net = sock_net(sk);
1604         __u8 proto;
1605         struct sk_buff *out_skb;
1606         struct sadb_msg *out_hdr;
1607         struct xfrm_state *x;
1608
1609         if (!ext_hdrs[SADB_EXT_SA-1] ||
1610             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1611                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1612                 return -EINVAL;
1613
1614         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1615         if (x == NULL)
1616                 return -ESRCH;
1617
1618         out_skb = pfkey_xfrm_state2msg(x);
1619         proto = x->id.proto;
1620         xfrm_state_put(x);
1621         if (IS_ERR(out_skb))
1622                 return  PTR_ERR(out_skb);
1623
1624         out_hdr = (struct sadb_msg *) out_skb->data;
1625         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1626         out_hdr->sadb_msg_type = SADB_GET;
1627         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1628         out_hdr->sadb_msg_errno = 0;
1629         out_hdr->sadb_msg_reserved = 0;
1630         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1631         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1632         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1633
1634         return 0;
1635 }
1636
1637 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1638                                               gfp_t allocation)
1639 {
1640         struct sk_buff *skb;
1641         struct sadb_msg *hdr;
1642         int len, auth_len, enc_len, i;
1643
1644         auth_len = xfrm_count_pfkey_auth_supported();
1645         if (auth_len) {
1646                 auth_len *= sizeof(struct sadb_alg);
1647                 auth_len += sizeof(struct sadb_supported);
1648         }
1649
1650         enc_len = xfrm_count_pfkey_enc_supported();
1651         if (enc_len) {
1652                 enc_len *= sizeof(struct sadb_alg);
1653                 enc_len += sizeof(struct sadb_supported);
1654         }
1655
1656         len = enc_len + auth_len + sizeof(struct sadb_msg);
1657
1658         skb = alloc_skb(len + 16, allocation);
1659         if (!skb)
1660                 goto out_put_algs;
1661
1662         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1663         pfkey_hdr_dup(hdr, orig);
1664         hdr->sadb_msg_errno = 0;
1665         hdr->sadb_msg_len = len / sizeof(uint64_t);
1666
1667         if (auth_len) {
1668                 struct sadb_supported *sp;
1669                 struct sadb_alg *ap;
1670
1671                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1672                 ap = (struct sadb_alg *) (sp + 1);
1673
1674                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1675                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1676
1677                 for (i = 0; ; i++) {
1678                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1679                         if (!aalg)
1680                                 break;
1681                         if (!aalg->pfkey_supported)
1682                                 continue;
1683                         if (aalg->available)
1684                                 *ap++ = aalg->desc;
1685                 }
1686         }
1687
1688         if (enc_len) {
1689                 struct sadb_supported *sp;
1690                 struct sadb_alg *ap;
1691
1692                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1693                 ap = (struct sadb_alg *) (sp + 1);
1694
1695                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1696                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1697
1698                 for (i = 0; ; i++) {
1699                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1700                         if (!ealg)
1701                                 break;
1702                         if (!ealg->pfkey_supported)
1703                                 continue;
1704                         if (ealg->available)
1705                                 *ap++ = ealg->desc;
1706                 }
1707         }
1708
1709 out_put_algs:
1710         return skb;
1711 }
1712
1713 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1714 {
1715         struct pfkey_sock *pfk = pfkey_sk(sk);
1716         struct sk_buff *supp_skb;
1717
1718         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1719                 return -EINVAL;
1720
1721         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1722                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1723                         return -EEXIST;
1724                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1725         }
1726
1727         xfrm_probe_algs();
1728
1729         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1730         if (!supp_skb) {
1731                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1732                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1733
1734                 return -ENOBUFS;
1735         }
1736
1737         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1738                         sock_net(sk));
1739         return 0;
1740 }
1741
1742 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1743 {
1744         struct sk_buff *skb;
1745         struct sadb_msg *hdr;
1746
1747         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1748         if (!skb)
1749                 return -ENOBUFS;
1750
1751         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1752         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1753         hdr->sadb_msg_errno = (uint8_t) 0;
1754         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1755
1756         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1757                                sock_net(sk));
1758 }
1759
1760 static int key_notify_sa_flush(const struct km_event *c)
1761 {
1762         struct sk_buff *skb;
1763         struct sadb_msg *hdr;
1764
1765         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1766         if (!skb)
1767                 return -ENOBUFS;
1768         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1769         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1770         hdr->sadb_msg_type = SADB_FLUSH;
1771         hdr->sadb_msg_seq = c->seq;
1772         hdr->sadb_msg_pid = c->portid;
1773         hdr->sadb_msg_version = PF_KEY_V2;
1774         hdr->sadb_msg_errno = (uint8_t) 0;
1775         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1776         hdr->sadb_msg_reserved = 0;
1777
1778         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1779
1780         return 0;
1781 }
1782
1783 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1784 {
1785         struct net *net = sock_net(sk);
1786         unsigned int proto;
1787         struct km_event c;
1788         int err, err2;
1789
1790         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1791         if (proto == 0)
1792                 return -EINVAL;
1793
1794         err = xfrm_state_flush(net, proto, true);
1795         err2 = unicast_flush_resp(sk, hdr);
1796         if (err || err2) {
1797                 if (err == -ESRCH) /* empty table - go quietly */
1798                         err = 0;
1799                 return err ? err : err2;
1800         }
1801
1802         c.data.proto = proto;
1803         c.seq = hdr->sadb_msg_seq;
1804         c.portid = hdr->sadb_msg_pid;
1805         c.event = XFRM_MSG_FLUSHSA;
1806         c.net = net;
1807         km_state_notify(NULL, &c);
1808
1809         return 0;
1810 }
1811
1812 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1813 {
1814         struct pfkey_sock *pfk = ptr;
1815         struct sk_buff *out_skb;
1816         struct sadb_msg *out_hdr;
1817
1818         if (!pfkey_can_dump(&pfk->sk))
1819                 return -ENOBUFS;
1820
1821         out_skb = pfkey_xfrm_state2msg(x);
1822         if (IS_ERR(out_skb))
1823                 return PTR_ERR(out_skb);
1824
1825         out_hdr = (struct sadb_msg *) out_skb->data;
1826         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1827         out_hdr->sadb_msg_type = SADB_DUMP;
1828         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1829         out_hdr->sadb_msg_errno = 0;
1830         out_hdr->sadb_msg_reserved = 0;
1831         out_hdr->sadb_msg_seq = count + 1;
1832         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1833
1834         if (pfk->dump.skb)
1835                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1836                                 &pfk->sk, sock_net(&pfk->sk));
1837         pfk->dump.skb = out_skb;
1838
1839         return 0;
1840 }
1841
1842 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1843 {
1844         struct net *net = sock_net(&pfk->sk);
1845         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1846 }
1847
1848 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1849 {
1850         struct net *net = sock_net(&pfk->sk);
1851
1852         xfrm_state_walk_done(&pfk->dump.u.state, net);
1853 }
1854
1855 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1856 {
1857         u8 proto;
1858         struct xfrm_address_filter *filter = NULL;
1859         struct pfkey_sock *pfk = pfkey_sk(sk);
1860
1861         mutex_lock(&pfk->dump_lock);
1862         if (pfk->dump.dump != NULL) {
1863                 mutex_unlock(&pfk->dump_lock);
1864                 return -EBUSY;
1865         }
1866
1867         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1868         if (proto == 0) {
1869                 mutex_unlock(&pfk->dump_lock);
1870                 return -EINVAL;
1871         }
1872
1873         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1874                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1875
1876                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1877                 if (filter == NULL) {
1878                         mutex_unlock(&pfk->dump_lock);
1879                         return -ENOMEM;
1880                 }
1881
1882                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1883                        sizeof(xfrm_address_t));
1884                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1885                        sizeof(xfrm_address_t));
1886                 filter->family = xfilter->sadb_x_filter_family;
1887                 filter->splen = xfilter->sadb_x_filter_splen;
1888                 filter->dplen = xfilter->sadb_x_filter_dplen;
1889         }
1890
1891         pfk->dump.msg_version = hdr->sadb_msg_version;
1892         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1893         pfk->dump.dump = pfkey_dump_sa;
1894         pfk->dump.done = pfkey_dump_sa_done;
1895         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1896         mutex_unlock(&pfk->dump_lock);
1897
1898         return pfkey_do_dump(pfk);
1899 }
1900
1901 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1902 {
1903         struct pfkey_sock *pfk = pfkey_sk(sk);
1904         int satype = hdr->sadb_msg_satype;
1905         bool reset_errno = false;
1906
1907         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1908                 reset_errno = true;
1909                 if (satype != 0 && satype != 1)
1910                         return -EINVAL;
1911                 pfk->promisc = satype;
1912         }
1913         if (reset_errno && skb_cloned(skb))
1914                 skb = skb_copy(skb, GFP_KERNEL);
1915         else
1916                 skb = skb_clone(skb, GFP_KERNEL);
1917
1918         if (reset_errno && skb) {
1919                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1920                 new_hdr->sadb_msg_errno = 0;
1921         }
1922
1923         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1924         return 0;
1925 }
1926
1927 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1928 {
1929         int i;
1930         u32 reqid = *(u32*)ptr;
1931
1932         for (i=0; i<xp->xfrm_nr; i++) {
1933                 if (xp->xfrm_vec[i].reqid == reqid)
1934                         return -EEXIST;
1935         }
1936         return 0;
1937 }
1938
1939 static u32 gen_reqid(struct net *net)
1940 {
1941         struct xfrm_policy_walk walk;
1942         u32 start;
1943         int rc;
1944         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1945
1946         start = reqid;
1947         do {
1948                 ++reqid;
1949                 if (reqid == 0)
1950                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1951                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1952                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1953                 xfrm_policy_walk_done(&walk, net);
1954                 if (rc != -EEXIST)
1955                         return reqid;
1956         } while (reqid != start);
1957         return 0;
1958 }
1959
1960 static int
1961 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1962 {
1963         struct net *net = xp_net(xp);
1964         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1965         int mode;
1966
1967         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1968                 return -ELOOP;
1969
1970         if (rq->sadb_x_ipsecrequest_mode == 0)
1971                 return -EINVAL;
1972
1973         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1974         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1975                 return -EINVAL;
1976         t->mode = mode;
1977         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1978                 t->optional = 1;
1979         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1980                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1981                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1982                         t->reqid = 0;
1983                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1984                         return -ENOBUFS;
1985         }
1986
1987         /* addresses present only in tunnel mode */
1988         if (t->mode == XFRM_MODE_TUNNEL) {
1989                 int err;
1990
1991                 err = parse_sockaddr_pair(
1992                         (struct sockaddr *)(rq + 1),
1993                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
1994                         &t->saddr, &t->id.daddr, &t->encap_family);
1995                 if (err)
1996                         return err;
1997         } else
1998                 t->encap_family = xp->family;
1999
2000         /* No way to set this via kame pfkey */
2001         t->allalgs = 1;
2002         xp->xfrm_nr++;
2003         return 0;
2004 }
2005
2006 static int
2007 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2008 {
2009         int err;
2010         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2011         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2012
2013         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2014                 return -EINVAL;
2015
2016         while (len >= sizeof(*rq)) {
2017                 if (len < rq->sadb_x_ipsecrequest_len ||
2018                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2019                         return -EINVAL;
2020
2021                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2022                         return err;
2023                 len -= rq->sadb_x_ipsecrequest_len;
2024                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2025         }
2026         return 0;
2027 }
2028
2029 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2030 {
2031   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2032
2033         if (xfrm_ctx) {
2034                 int len = sizeof(struct sadb_x_sec_ctx);
2035                 len += xfrm_ctx->ctx_len;
2036                 return PFKEY_ALIGN8(len);
2037         }
2038         return 0;
2039 }
2040
2041 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2042 {
2043         const struct xfrm_tmpl *t;
2044         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2045         int socklen = 0;
2046         int i;
2047
2048         for (i=0; i<xp->xfrm_nr; i++) {
2049                 t = xp->xfrm_vec + i;
2050                 socklen += pfkey_sockaddr_len(t->encap_family);
2051         }
2052
2053         return sizeof(struct sadb_msg) +
2054                 (sizeof(struct sadb_lifetime) * 3) +
2055                 (sizeof(struct sadb_address) * 2) +
2056                 (sockaddr_size * 2) +
2057                 sizeof(struct sadb_x_policy) +
2058                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2059                 (socklen * 2) +
2060                 pfkey_xfrm_policy2sec_ctx_size(xp);
2061 }
2062
2063 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2064 {
2065         struct sk_buff *skb;
2066         int size;
2067
2068         size = pfkey_xfrm_policy2msg_size(xp);
2069
2070         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2071         if (skb == NULL)
2072                 return ERR_PTR(-ENOBUFS);
2073
2074         return skb;
2075 }
2076
2077 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2078 {
2079         struct sadb_msg *hdr;
2080         struct sadb_address *addr;
2081         struct sadb_lifetime *lifetime;
2082         struct sadb_x_policy *pol;
2083         struct sadb_x_sec_ctx *sec_ctx;
2084         struct xfrm_sec_ctx *xfrm_ctx;
2085         int i;
2086         int size;
2087         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2088         int socklen = pfkey_sockaddr_len(xp->family);
2089
2090         size = pfkey_xfrm_policy2msg_size(xp);
2091
2092         /* call should fill header later */
2093         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2094         memset(hdr, 0, size);   /* XXX do we need this ? */
2095
2096         /* src address */
2097         addr = (struct sadb_address*) skb_put(skb,
2098                                               sizeof(struct sadb_address)+sockaddr_size);
2099         addr->sadb_address_len =
2100                 (sizeof(struct sadb_address)+sockaddr_size)/
2101                         sizeof(uint64_t);
2102         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2103         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2104         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2105         addr->sadb_address_reserved = 0;
2106         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2107                                  xp->selector.sport,
2108                                  (struct sockaddr *) (addr + 1),
2109                                  xp->family))
2110                 BUG();
2111
2112         /* dst address */
2113         addr = (struct sadb_address*) skb_put(skb,
2114                                               sizeof(struct sadb_address)+sockaddr_size);
2115         addr->sadb_address_len =
2116                 (sizeof(struct sadb_address)+sockaddr_size)/
2117                         sizeof(uint64_t);
2118         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2119         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2120         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2121         addr->sadb_address_reserved = 0;
2122
2123         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2124                             (struct sockaddr *) (addr + 1),
2125                             xp->family);
2126
2127         /* hard time */
2128         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2129                                                      sizeof(struct sadb_lifetime));
2130         lifetime->sadb_lifetime_len =
2131                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2132         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2133         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2134         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2135         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2136         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2137         /* soft time */
2138         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2139                                                      sizeof(struct sadb_lifetime));
2140         lifetime->sadb_lifetime_len =
2141                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2142         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2143         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2144         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2145         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2146         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2147         /* current time */
2148         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2149                                                      sizeof(struct sadb_lifetime));
2150         lifetime->sadb_lifetime_len =
2151                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2152         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2153         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2154         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2155         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2156         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2157
2158         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2159         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2160         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2161         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2162         if (xp->action == XFRM_POLICY_ALLOW) {
2163                 if (xp->xfrm_nr)
2164                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2165                 else
2166                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2167         }
2168         pol->sadb_x_policy_dir = dir+1;
2169         pol->sadb_x_policy_reserved = 0;
2170         pol->sadb_x_policy_id = xp->index;
2171         pol->sadb_x_policy_priority = xp->priority;
2172
2173         for (i=0; i<xp->xfrm_nr; i++) {
2174                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2175                 struct sadb_x_ipsecrequest *rq;
2176                 int req_size;
2177                 int mode;
2178
2179                 req_size = sizeof(struct sadb_x_ipsecrequest);
2180                 if (t->mode == XFRM_MODE_TUNNEL) {
2181                         socklen = pfkey_sockaddr_len(t->encap_family);
2182                         req_size += socklen * 2;
2183                 } else {
2184                         size -= 2*socklen;
2185                 }
2186                 rq = (void*)skb_put(skb, req_size);
2187                 pol->sadb_x_policy_len += req_size/8;
2188                 memset(rq, 0, sizeof(*rq));
2189                 rq->sadb_x_ipsecrequest_len = req_size;
2190                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2191                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2192                         return -EINVAL;
2193                 rq->sadb_x_ipsecrequest_mode = mode;
2194                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2195                 if (t->reqid)
2196                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2197                 if (t->optional)
2198                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2199                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2200
2201                 if (t->mode == XFRM_MODE_TUNNEL) {
2202                         u8 *sa = (void *)(rq + 1);
2203                         pfkey_sockaddr_fill(&t->saddr, 0,
2204                                             (struct sockaddr *)sa,
2205                                             t->encap_family);
2206                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2207                                             (struct sockaddr *) (sa + socklen),
2208                                             t->encap_family);
2209                 }
2210         }
2211
2212         /* security context */
2213         if ((xfrm_ctx = xp->security)) {
2214                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2215
2216                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2217                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2218                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2219                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2220                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2221                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2222                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2223                        xfrm_ctx->ctx_len);
2224         }
2225
2226         hdr->sadb_msg_len = size / sizeof(uint64_t);
2227         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2228
2229         return 0;
2230 }
2231
2232 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2233 {
2234         struct sk_buff *out_skb;
2235         struct sadb_msg *out_hdr;
2236         int err;
2237
2238         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2239         if (IS_ERR(out_skb))
2240                 return PTR_ERR(out_skb);
2241
2242         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2243         if (err < 0)
2244                 return err;
2245
2246         out_hdr = (struct sadb_msg *) out_skb->data;
2247         out_hdr->sadb_msg_version = PF_KEY_V2;
2248
2249         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2250                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2251         else
2252                 out_hdr->sadb_msg_type = event2poltype(c->event);
2253         out_hdr->sadb_msg_errno = 0;
2254         out_hdr->sadb_msg_seq = c->seq;
2255         out_hdr->sadb_msg_pid = c->portid;
2256         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2257         return 0;
2258
2259 }
2260
2261 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2262 {
2263         struct net *net = sock_net(sk);
2264         int err = 0;
2265         struct sadb_lifetime *lifetime;
2266         struct sadb_address *sa;
2267         struct sadb_x_policy *pol;
2268         struct xfrm_policy *xp;
2269         struct km_event c;
2270         struct sadb_x_sec_ctx *sec_ctx;
2271
2272         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2273                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2274             !ext_hdrs[SADB_X_EXT_POLICY-1])
2275                 return -EINVAL;
2276
2277         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2278         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2279                 return -EINVAL;
2280         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2281                 return -EINVAL;
2282
2283         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2284         if (xp == NULL)
2285                 return -ENOBUFS;
2286
2287         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2288                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2289         xp->priority = pol->sadb_x_policy_priority;
2290
2291         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2292         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2293         xp->selector.family = xp->family;
2294         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2295         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2296         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2297         if (xp->selector.sport)
2298                 xp->selector.sport_mask = htons(0xffff);
2299
2300         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2301         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2302         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2303
2304         /* Amusing, we set this twice.  KAME apps appear to set same value
2305          * in both addresses.
2306          */
2307         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2308
2309         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2310         if (xp->selector.dport)
2311                 xp->selector.dport_mask = htons(0xffff);
2312
2313         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2314         if (sec_ctx != NULL) {
2315                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2316
2317                 if (!uctx) {
2318                         err = -ENOBUFS;
2319                         goto out;
2320                 }
2321
2322                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2323                 kfree(uctx);
2324
2325                 if (err)
2326                         goto out;
2327         }
2328
2329         xp->lft.soft_byte_limit = XFRM_INF;
2330         xp->lft.hard_byte_limit = XFRM_INF;
2331         xp->lft.soft_packet_limit = XFRM_INF;
2332         xp->lft.hard_packet_limit = XFRM_INF;
2333         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2334                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2335                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2336                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2337                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2338         }
2339         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2340                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2341                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2342                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2343                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2344         }
2345         xp->xfrm_nr = 0;
2346         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2347             (err = parse_ipsecrequests(xp, pol)) < 0)
2348                 goto out;
2349
2350         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2351                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2352
2353         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2354
2355         if (err)
2356                 goto out;
2357
2358         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2359                 c.event = XFRM_MSG_UPDPOLICY;
2360         else
2361                 c.event = XFRM_MSG_NEWPOLICY;
2362
2363         c.seq = hdr->sadb_msg_seq;
2364         c.portid = hdr->sadb_msg_pid;
2365
2366         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367         xfrm_pol_put(xp);
2368         return 0;
2369
2370 out:
2371         xp->walk.dead = 1;
2372         xfrm_policy_destroy(xp);
2373         return err;
2374 }
2375
2376 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2377 {
2378         struct net *net = sock_net(sk);
2379         int err;
2380         struct sadb_address *sa;
2381         struct sadb_x_policy *pol;
2382         struct xfrm_policy *xp;
2383         struct xfrm_selector sel;
2384         struct km_event c;
2385         struct sadb_x_sec_ctx *sec_ctx;
2386         struct xfrm_sec_ctx *pol_ctx = NULL;
2387
2388         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2389                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2390             !ext_hdrs[SADB_X_EXT_POLICY-1])
2391                 return -EINVAL;
2392
2393         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2394         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2395                 return -EINVAL;
2396
2397         memset(&sel, 0, sizeof(sel));
2398
2399         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2400         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2401         sel.prefixlen_s = sa->sadb_address_prefixlen;
2402         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2403         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2404         if (sel.sport)
2405                 sel.sport_mask = htons(0xffff);
2406
2407         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2408         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2409         sel.prefixlen_d = sa->sadb_address_prefixlen;
2410         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2411         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2412         if (sel.dport)
2413                 sel.dport_mask = htons(0xffff);
2414
2415         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2416         if (sec_ctx != NULL) {
2417                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2418
2419                 if (!uctx)
2420                         return -ENOMEM;
2421
2422                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2423                 kfree(uctx);
2424                 if (err)
2425                         return err;
2426         }
2427
2428         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2429                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2430                                    1, &err);
2431         security_xfrm_policy_free(pol_ctx);
2432         if (xp == NULL)
2433                 return -ENOENT;
2434
2435         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2436
2437         if (err)
2438                 goto out;
2439
2440         c.seq = hdr->sadb_msg_seq;
2441         c.portid = hdr->sadb_msg_pid;
2442         c.data.byid = 0;
2443         c.event = XFRM_MSG_DELPOLICY;
2444         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2445
2446 out:
2447         xfrm_pol_put(xp);
2448         if (err == 0)
2449                 xfrm_garbage_collect(net);
2450         return err;
2451 }
2452
2453 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2454 {
2455         int err;
2456         struct sk_buff *out_skb;
2457         struct sadb_msg *out_hdr;
2458         err = 0;
2459
2460         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2461         if (IS_ERR(out_skb)) {
2462                 err =  PTR_ERR(out_skb);
2463                 goto out;
2464         }
2465         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2466         if (err < 0)
2467                 goto out;
2468
2469         out_hdr = (struct sadb_msg *) out_skb->data;
2470         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2471         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2472         out_hdr->sadb_msg_satype = 0;
2473         out_hdr->sadb_msg_errno = 0;
2474         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2475         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2476         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2477         err = 0;
2478
2479 out:
2480         return err;
2481 }
2482
2483 static int pfkey_sockaddr_pair_size(sa_family_t family)
2484 {
2485         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2486 }
2487
2488 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2489                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2490                                u16 *family)
2491 {
2492         int af, socklen;
2493
2494         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2495                 return -EINVAL;
2496
2497         af = pfkey_sockaddr_extract(sa, saddr);
2498         if (!af)
2499                 return -EINVAL;
2500
2501         socklen = pfkey_sockaddr_len(af);
2502         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2503                                    daddr) != af)
2504                 return -EINVAL;
2505
2506         *family = af;
2507         return 0;
2508 }
2509
2510 #ifdef CONFIG_NET_KEY_MIGRATE
2511 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2512                                     struct xfrm_migrate *m)
2513 {
2514         int err;
2515         struct sadb_x_ipsecrequest *rq2;
2516         int mode;
2517
2518         if (len < sizeof(*rq1) ||
2519             len < rq1->sadb_x_ipsecrequest_len ||
2520             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2521                 return -EINVAL;
2522
2523         /* old endoints */
2524         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2525                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2526                                   &m->old_saddr, &m->old_daddr,
2527                                   &m->old_family);
2528         if (err)
2529                 return err;
2530
2531         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2532         len -= rq1->sadb_x_ipsecrequest_len;
2533
2534         if (len <= sizeof(*rq2) ||
2535             len < rq2->sadb_x_ipsecrequest_len ||
2536             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2537                 return -EINVAL;
2538
2539         /* new endpoints */
2540         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2541                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2542                                   &m->new_saddr, &m->new_daddr,
2543                                   &m->new_family);
2544         if (err)
2545                 return err;
2546
2547         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2548             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2549             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2550                 return -EINVAL;
2551
2552         m->proto = rq1->sadb_x_ipsecrequest_proto;
2553         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2554                 return -EINVAL;
2555         m->mode = mode;
2556         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2557
2558         return ((int)(rq1->sadb_x_ipsecrequest_len +
2559                       rq2->sadb_x_ipsecrequest_len));
2560 }
2561
2562 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2563                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2564 {
2565         int i, len, ret, err = -EINVAL;
2566         u8 dir;
2567         struct sadb_address *sa;
2568         struct sadb_x_kmaddress *kma;
2569         struct sadb_x_policy *pol;
2570         struct sadb_x_ipsecrequest *rq;
2571         struct xfrm_selector sel;
2572         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2573         struct xfrm_kmaddress k;
2574         struct net *net = sock_net(sk);
2575
2576         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2577                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2578             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2579                 err = -EINVAL;
2580                 goto out;
2581         }
2582
2583         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2584         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2585
2586         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2587                 err = -EINVAL;
2588                 goto out;
2589         }
2590
2591         if (kma) {
2592                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2593                 k.reserved = kma->sadb_x_kmaddress_reserved;
2594                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2595                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2596                                           &k.local, &k.remote, &k.family);
2597                 if (ret < 0) {
2598                         err = ret;
2599                         goto out;
2600                 }
2601         }
2602
2603         dir = pol->sadb_x_policy_dir - 1;
2604         memset(&sel, 0, sizeof(sel));
2605
2606         /* set source address info of selector */
2607         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2608         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2609         sel.prefixlen_s = sa->sadb_address_prefixlen;
2610         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2611         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2612         if (sel.sport)
2613                 sel.sport_mask = htons(0xffff);
2614
2615         /* set destination address info of selector */
2616         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2617         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2618         sel.prefixlen_d = sa->sadb_address_prefixlen;
2619         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2620         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2621         if (sel.dport)
2622                 sel.dport_mask = htons(0xffff);
2623
2624         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2625
2626         /* extract ipsecrequests */
2627         i = 0;
2628         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2629
2630         while (len > 0 && i < XFRM_MAX_DEPTH) {
2631                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2632                 if (ret < 0) {
2633                         err = ret;
2634                         goto out;
2635                 } else {
2636                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2637                         len -= ret;
2638                         i++;
2639                 }
2640         }
2641
2642         if (!i || len > 0) {
2643                 err = -EINVAL;
2644                 goto out;
2645         }
2646
2647         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2648                             kma ? &k : NULL, net);
2649
2650  out:
2651         return err;
2652 }
2653 #else
2654 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2655                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2656 {
2657         return -ENOPROTOOPT;
2658 }
2659 #endif
2660
2661
2662 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2663 {
2664         struct net *net = sock_net(sk);
2665         unsigned int dir;
2666         int err = 0, delete;
2667         struct sadb_x_policy *pol;
2668         struct xfrm_policy *xp;
2669         struct km_event c;
2670
2671         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2672                 return -EINVAL;
2673
2674         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2675         if (dir >= XFRM_POLICY_MAX)
2676                 return -EINVAL;
2677
2678         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2679         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2680                               dir, pol->sadb_x_policy_id, delete, &err);
2681         if (xp == NULL)
2682                 return -ENOENT;
2683
2684         if (delete) {
2685                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2686
2687                 if (err)
2688                         goto out;
2689                 c.seq = hdr->sadb_msg_seq;
2690                 c.portid = hdr->sadb_msg_pid;
2691                 c.data.byid = 1;
2692                 c.event = XFRM_MSG_DELPOLICY;
2693                 km_policy_notify(xp, dir, &c);
2694         } else {
2695                 err = key_pol_get_resp(sk, xp, hdr, dir);
2696         }
2697
2698 out:
2699         xfrm_pol_put(xp);
2700         if (delete && err == 0)
2701                 xfrm_garbage_collect(net);
2702         return err;
2703 }
2704
2705 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2706 {
2707         struct pfkey_sock *pfk = ptr;
2708         struct sk_buff *out_skb;
2709         struct sadb_msg *out_hdr;
2710         int err;
2711
2712         if (!pfkey_can_dump(&pfk->sk))
2713                 return -ENOBUFS;
2714
2715         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2716         if (IS_ERR(out_skb))
2717                 return PTR_ERR(out_skb);
2718
2719         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2720         if (err < 0)
2721                 return err;
2722
2723         out_hdr = (struct sadb_msg *) out_skb->data;
2724         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2725         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2726         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2727         out_hdr->sadb_msg_errno = 0;
2728         out_hdr->sadb_msg_seq = count + 1;
2729         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2730
2731         if (pfk->dump.skb)
2732                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2733                                 &pfk->sk, sock_net(&pfk->sk));
2734         pfk->dump.skb = out_skb;
2735
2736         return 0;
2737 }
2738
2739 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2740 {
2741         struct net *net = sock_net(&pfk->sk);
2742         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2743 }
2744
2745 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2746 {
2747         struct net *net = sock_net((struct sock *)pfk);
2748
2749         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2750 }
2751
2752 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2753 {
2754         struct pfkey_sock *pfk = pfkey_sk(sk);
2755
2756         mutex_lock(&pfk->dump_lock);
2757         if (pfk->dump.dump != NULL) {
2758                 mutex_unlock(&pfk->dump_lock);
2759                 return -EBUSY;
2760         }
2761
2762         pfk->dump.msg_version = hdr->sadb_msg_version;
2763         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2764         pfk->dump.dump = pfkey_dump_sp;
2765         pfk->dump.done = pfkey_dump_sp_done;
2766         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2767         mutex_unlock(&pfk->dump_lock);
2768
2769         return pfkey_do_dump(pfk);
2770 }
2771
2772 static int key_notify_policy_flush(const struct km_event *c)
2773 {
2774         struct sk_buff *skb_out;
2775         struct sadb_msg *hdr;
2776
2777         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2778         if (!skb_out)
2779                 return -ENOBUFS;
2780         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2781         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2782         hdr->sadb_msg_seq = c->seq;
2783         hdr->sadb_msg_pid = c->portid;
2784         hdr->sadb_msg_version = PF_KEY_V2;
2785         hdr->sadb_msg_errno = (uint8_t) 0;
2786         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2787         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2788         hdr->sadb_msg_reserved = 0;
2789         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2790         return 0;
2791
2792 }
2793
2794 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2795 {
2796         struct net *net = sock_net(sk);
2797         struct km_event c;
2798         int err, err2;
2799
2800         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2801         err2 = unicast_flush_resp(sk, hdr);
2802         if (err || err2) {
2803                 if (err == -ESRCH) /* empty table - old silent behavior */
2804                         return 0;
2805                 return err;
2806         }
2807
2808         c.data.type = XFRM_POLICY_TYPE_MAIN;
2809         c.event = XFRM_MSG_FLUSHPOLICY;
2810         c.portid = hdr->sadb_msg_pid;
2811         c.seq = hdr->sadb_msg_seq;
2812         c.net = net;
2813         km_policy_notify(NULL, 0, &c);
2814
2815         return 0;
2816 }
2817
2818 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2819                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2820 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2821         [SADB_RESERVED]         = pfkey_reserved,
2822         [SADB_GETSPI]           = pfkey_getspi,
2823         [SADB_UPDATE]           = pfkey_add,
2824         [SADB_ADD]              = pfkey_add,
2825         [SADB_DELETE]           = pfkey_delete,
2826         [SADB_GET]              = pfkey_get,
2827         [SADB_ACQUIRE]          = pfkey_acquire,
2828         [SADB_REGISTER]         = pfkey_register,
2829         [SADB_EXPIRE]           = NULL,
2830         [SADB_FLUSH]            = pfkey_flush,
2831         [SADB_DUMP]             = pfkey_dump,
2832         [SADB_X_PROMISC]        = pfkey_promisc,
2833         [SADB_X_PCHANGE]        = NULL,
2834         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2835         [SADB_X_SPDADD]         = pfkey_spdadd,
2836         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2837         [SADB_X_SPDGET]         = pfkey_spdget,
2838         [SADB_X_SPDACQUIRE]     = NULL,
2839         [SADB_X_SPDDUMP]        = pfkey_spddump,
2840         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2841         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2842         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2843         [SADB_X_MIGRATE]        = pfkey_migrate,
2844 };
2845
2846 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2847 {
2848         void *ext_hdrs[SADB_EXT_MAX];
2849         int err;
2850
2851         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2852                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2853
2854         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2855         err = parse_exthdrs(skb, hdr, ext_hdrs);
2856         if (!err) {
2857                 err = -EOPNOTSUPP;
2858                 if (pfkey_funcs[hdr->sadb_msg_type])
2859                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2860         }
2861         return err;
2862 }
2863
2864 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2865 {
2866         struct sadb_msg *hdr = NULL;
2867
2868         if (skb->len < sizeof(*hdr)) {
2869                 *errp = -EMSGSIZE;
2870         } else {
2871                 hdr = (struct sadb_msg *) skb->data;
2872                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2873                     hdr->sadb_msg_reserved != 0 ||
2874                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2875                      hdr->sadb_msg_type > SADB_MAX)) {
2876                         hdr = NULL;
2877                         *errp = -EINVAL;
2878                 } else if (hdr->sadb_msg_len != (skb->len /
2879                                                  sizeof(uint64_t)) ||
2880                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2881                                                 sizeof(uint64_t))) {
2882                         hdr = NULL;
2883                         *errp = -EMSGSIZE;
2884                 } else {
2885                         *errp = 0;
2886                 }
2887         }
2888         return hdr;
2889 }
2890
2891 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2892                                 const struct xfrm_algo_desc *d)
2893 {
2894         unsigned int id = d->desc.sadb_alg_id;
2895
2896         if (id >= sizeof(t->aalgos) * 8)
2897                 return 0;
2898
2899         return (t->aalgos >> id) & 1;
2900 }
2901
2902 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2903                                 const struct xfrm_algo_desc *d)
2904 {
2905         unsigned int id = d->desc.sadb_alg_id;
2906
2907         if (id >= sizeof(t->ealgos) * 8)
2908                 return 0;
2909
2910         return (t->ealgos >> id) & 1;
2911 }
2912
2913 static int count_ah_combs(const struct xfrm_tmpl *t)
2914 {
2915         int i, sz = 0;
2916
2917         for (i = 0; ; i++) {
2918                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2919                 if (!aalg)
2920                         break;
2921                 if (!aalg->pfkey_supported)
2922                         continue;
2923                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2924                         sz += sizeof(struct sadb_comb);
2925         }
2926         return sz + sizeof(struct sadb_prop);
2927 }
2928
2929 static int count_esp_combs(const struct xfrm_tmpl *t)
2930 {
2931         int i, k, sz = 0;
2932
2933         for (i = 0; ; i++) {
2934                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2935                 if (!ealg)
2936                         break;
2937
2938                 if (!ealg->pfkey_supported)
2939                         continue;
2940
2941                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2942                         continue;
2943
2944                 for (k = 1; ; k++) {
2945                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2946                         if (!aalg)
2947                                 break;
2948
2949                         if (!aalg->pfkey_supported)
2950                                 continue;
2951
2952                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2953                                 sz += sizeof(struct sadb_comb);
2954                 }
2955         }
2956         return sz + sizeof(struct sadb_prop);
2957 }
2958
2959 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2960 {
2961         struct sadb_prop *p;
2962         int i;
2963
2964         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2965         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2966         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2967         p->sadb_prop_replay = 32;
2968         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2969
2970         for (i = 0; ; i++) {
2971                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2972                 if (!aalg)
2973                         break;
2974
2975                 if (!aalg->pfkey_supported)
2976                         continue;
2977
2978                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2979                         struct sadb_comb *c;
2980                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2981                         memset(c, 0, sizeof(*c));
2982                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2983                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2984                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2985                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2986                         c->sadb_comb_hard_addtime = 24*60*60;
2987                         c->sadb_comb_soft_addtime = 20*60*60;
2988                         c->sadb_comb_hard_usetime = 8*60*60;
2989                         c->sadb_comb_soft_usetime = 7*60*60;
2990                 }
2991         }
2992 }
2993
2994 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2995 {
2996         struct sadb_prop *p;
2997         int i, k;
2998
2999         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
3000         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
3001         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
3002         p->sadb_prop_replay = 32;
3003         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3004
3005         for (i=0; ; i++) {
3006                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3007                 if (!ealg)
3008                         break;
3009
3010                 if (!ealg->pfkey_supported)
3011                         continue;
3012
3013                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3014                         continue;
3015
3016                 for (k = 1; ; k++) {
3017                         struct sadb_comb *c;
3018                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3019                         if (!aalg)
3020                                 break;
3021                         if (!aalg->pfkey_supported)
3022                                 continue;
3023                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3024                                 continue;
3025                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
3026                         memset(c, 0, sizeof(*c));
3027                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3028                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3029                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3030                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3031                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3032                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3033                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3034                         c->sadb_comb_hard_addtime = 24*60*60;
3035                         c->sadb_comb_soft_addtime = 20*60*60;
3036                         c->sadb_comb_hard_usetime = 8*60*60;
3037                         c->sadb_comb_soft_usetime = 7*60*60;
3038                 }
3039         }
3040 }
3041
3042 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3043 {
3044         return 0;
3045 }
3046
3047 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3048 {
3049         struct sk_buff *out_skb;
3050         struct sadb_msg *out_hdr;
3051         int hard;
3052         int hsc;
3053
3054         hard = c->data.hard;
3055         if (hard)
3056                 hsc = 2;
3057         else
3058                 hsc = 1;
3059
3060         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3061         if (IS_ERR(out_skb))
3062                 return PTR_ERR(out_skb);
3063
3064         out_hdr = (struct sadb_msg *) out_skb->data;
3065         out_hdr->sadb_msg_version = PF_KEY_V2;
3066         out_hdr->sadb_msg_type = SADB_EXPIRE;
3067         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3068         out_hdr->sadb_msg_errno = 0;
3069         out_hdr->sadb_msg_reserved = 0;
3070         out_hdr->sadb_msg_seq = 0;
3071         out_hdr->sadb_msg_pid = 0;
3072
3073         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3074                         xs_net(x));
3075         return 0;
3076 }
3077
3078 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3079 {
3080         struct net *net = x ? xs_net(x) : c->net;
3081         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3082
3083         if (atomic_read(&net_pfkey->socks_nr) == 0)
3084                 return 0;
3085
3086         switch (c->event) {
3087         case XFRM_MSG_EXPIRE:
3088                 return key_notify_sa_expire(x, c);
3089         case XFRM_MSG_DELSA:
3090         case XFRM_MSG_NEWSA:
3091         case XFRM_MSG_UPDSA:
3092                 return key_notify_sa(x, c);
3093         case XFRM_MSG_FLUSHSA:
3094                 return key_notify_sa_flush(c);
3095         case XFRM_MSG_NEWAE: /* not yet supported */
3096                 break;
3097         default:
3098                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3099                 break;
3100         }
3101
3102         return 0;
3103 }
3104
3105 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3106 {
3107         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3108                 return 0;
3109
3110         switch (c->event) {
3111         case XFRM_MSG_POLEXPIRE:
3112                 return key_notify_policy_expire(xp, c);
3113         case XFRM_MSG_DELPOLICY:
3114         case XFRM_MSG_NEWPOLICY:
3115         case XFRM_MSG_UPDPOLICY:
3116                 return key_notify_policy(xp, dir, c);
3117         case XFRM_MSG_FLUSHPOLICY:
3118                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3119                         break;
3120                 return key_notify_policy_flush(c);
3121         default:
3122                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3123                 break;
3124         }
3125
3126         return 0;
3127 }
3128
3129 static u32 get_acqseq(void)
3130 {
3131         u32 res;
3132         static atomic_t acqseq;
3133
3134         do {
3135                 res = atomic_inc_return(&acqseq);
3136         } while (!res);
3137         return res;
3138 }
3139
3140 static bool pfkey_is_alive(const struct km_event *c)
3141 {
3142         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3143         struct sock *sk;
3144         bool is_alive = false;
3145
3146         rcu_read_lock();
3147         sk_for_each_rcu(sk, &net_pfkey->table) {
3148                 if (pfkey_sk(sk)->registered) {
3149                         is_alive = true;
3150                         break;
3151                 }
3152         }
3153         rcu_read_unlock();
3154
3155         return is_alive;
3156 }
3157
3158 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3159 {
3160         struct sk_buff *skb;
3161         struct sadb_msg *hdr;
3162         struct sadb_address *addr;
3163         struct sadb_x_policy *pol;
3164         int sockaddr_size;
3165         int size;
3166         struct sadb_x_sec_ctx *sec_ctx;
3167         struct xfrm_sec_ctx *xfrm_ctx;
3168         int ctx_size = 0;
3169
3170         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3171         if (!sockaddr_size)
3172                 return -EINVAL;
3173
3174         size = sizeof(struct sadb_msg) +
3175                 (sizeof(struct sadb_address) * 2) +
3176                 (sockaddr_size * 2) +
3177                 sizeof(struct sadb_x_policy);
3178
3179         if (x->id.proto == IPPROTO_AH)
3180                 size += count_ah_combs(t);
3181         else if (x->id.proto == IPPROTO_ESP)
3182                 size += count_esp_combs(t);
3183
3184         if ((xfrm_ctx = x->security)) {
3185                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3186                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3187         }
3188
3189         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3190         if (skb == NULL)
3191                 return -ENOMEM;
3192
3193         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3194         hdr->sadb_msg_version = PF_KEY_V2;
3195         hdr->sadb_msg_type = SADB_ACQUIRE;
3196         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3197         hdr->sadb_msg_len = size / sizeof(uint64_t);
3198         hdr->sadb_msg_errno = 0;
3199         hdr->sadb_msg_reserved = 0;
3200         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3201         hdr->sadb_msg_pid = 0;
3202
3203         /* src address */
3204         addr = (struct sadb_address*) skb_put(skb,
3205                                               sizeof(struct sadb_address)+sockaddr_size);
3206         addr->sadb_address_len =
3207                 (sizeof(struct sadb_address)+sockaddr_size)/
3208                         sizeof(uint64_t);
3209         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3210         addr->sadb_address_proto = 0;
3211         addr->sadb_address_reserved = 0;
3212         addr->sadb_address_prefixlen =
3213                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3214                                     (struct sockaddr *) (addr + 1),
3215                                     x->props.family);
3216         if (!addr->sadb_address_prefixlen)
3217                 BUG();
3218
3219         /* dst address */
3220         addr = (struct sadb_address*) skb_put(skb,
3221                                               sizeof(struct sadb_address)+sockaddr_size);
3222         addr->sadb_address_len =
3223                 (sizeof(struct sadb_address)+sockaddr_size)/
3224                         sizeof(uint64_t);
3225         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3226         addr->sadb_address_proto = 0;
3227         addr->sadb_address_reserved = 0;
3228         addr->sadb_address_prefixlen =
3229                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3230                                     (struct sockaddr *) (addr + 1),
3231                                     x->props.family);
3232         if (!addr->sadb_address_prefixlen)
3233                 BUG();
3234
3235         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3236         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3237         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3238         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3239         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3240         pol->sadb_x_policy_reserved = 0;
3241         pol->sadb_x_policy_id = xp->index;
3242         pol->sadb_x_policy_priority = xp->priority;
3243
3244         /* Set sadb_comb's. */
3245         if (x->id.proto == IPPROTO_AH)
3246                 dump_ah_combs(skb, t);
3247         else if (x->id.proto == IPPROTO_ESP)
3248                 dump_esp_combs(skb, t);
3249
3250         /* security context */
3251         if (xfrm_ctx) {
3252                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3253                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3254                 sec_ctx->sadb_x_sec_len =
3255                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3256                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3257                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3258                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3259                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3260                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3261                        xfrm_ctx->ctx_len);
3262         }
3263
3264         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3265                                xs_net(x));
3266 }
3267
3268 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3269                                                 u8 *data, int len, int *dir)
3270 {
3271         struct net *net = sock_net(sk);
3272         struct xfrm_policy *xp;
3273         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3274         struct sadb_x_sec_ctx *sec_ctx;
3275
3276         switch (sk->sk_family) {
3277         case AF_INET:
3278                 if (opt != IP_IPSEC_POLICY) {
3279                         *dir = -EOPNOTSUPP;
3280                         return NULL;
3281                 }
3282                 break;
3283 #if IS_ENABLED(CONFIG_IPV6)
3284         case AF_INET6:
3285                 if (opt != IPV6_IPSEC_POLICY) {
3286                         *dir = -EOPNOTSUPP;
3287                         return NULL;
3288                 }
3289                 break;
3290 #endif
3291         default:
3292                 *dir = -EINVAL;
3293                 return NULL;
3294         }
3295
3296         *dir = -EINVAL;
3297
3298         if (len < sizeof(struct sadb_x_policy) ||
3299             pol->sadb_x_policy_len*8 > len ||
3300             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3301             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3302                 return NULL;
3303
3304         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3305         if (xp == NULL) {
3306                 *dir = -ENOBUFS;
3307                 return NULL;
3308         }
3309
3310         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3311                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3312
3313         xp->lft.soft_byte_limit = XFRM_INF;
3314         xp->lft.hard_byte_limit = XFRM_INF;
3315         xp->lft.soft_packet_limit = XFRM_INF;
3316         xp->lft.hard_packet_limit = XFRM_INF;
3317         xp->family = sk->sk_family;
3318
3319         xp->xfrm_nr = 0;
3320         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3321             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3322                 goto out;
3323
3324         /* security context too */
3325         if (len >= (pol->sadb_x_policy_len*8 +
3326             sizeof(struct sadb_x_sec_ctx))) {
3327                 char *p = (char *)pol;
3328                 struct xfrm_user_sec_ctx *uctx;
3329
3330                 p += pol->sadb_x_policy_len*8;
3331                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3332                 if (len < pol->sadb_x_policy_len*8 +
3333                     sec_ctx->sadb_x_sec_len*8) {
3334                         *dir = -EINVAL;
3335                         goto out;
3336                 }
3337                 if ((*dir = verify_sec_ctx_len(p)))
3338                         goto out;
3339                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3340                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3341                 kfree(uctx);
3342
3343                 if (*dir)
3344                         goto out;
3345         }
3346
3347         *dir = pol->sadb_x_policy_dir-1;
3348         return xp;
3349
3350 out:
3351         xp->walk.dead = 1;
3352         xfrm_policy_destroy(xp);
3353         return NULL;
3354 }
3355
3356 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3357 {
3358         struct sk_buff *skb;
3359         struct sadb_msg *hdr;
3360         struct sadb_sa *sa;
3361         struct sadb_address *addr;
3362         struct sadb_x_nat_t_port *n_port;
3363         int sockaddr_size;
3364         int size;
3365         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3366         struct xfrm_encap_tmpl *natt = NULL;
3367
3368         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3369         if (!sockaddr_size)
3370                 return -EINVAL;
3371
3372         if (!satype)
3373                 return -EINVAL;
3374
3375         if (!x->encap)
3376                 return -EINVAL;
3377
3378         natt = x->encap;
3379
3380         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3381          *
3382          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3383          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3384          */
3385
3386         size = sizeof(struct sadb_msg) +
3387                 sizeof(struct sadb_sa) +
3388                 (sizeof(struct sadb_address) * 2) +
3389                 (sockaddr_size * 2) +
3390                 (sizeof(struct sadb_x_nat_t_port) * 2);
3391
3392         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3393         if (skb == NULL)
3394                 return -ENOMEM;
3395
3396         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3397         hdr->sadb_msg_version = PF_KEY_V2;
3398         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3399         hdr->sadb_msg_satype = satype;
3400         hdr->sadb_msg_len = size / sizeof(uint64_t);
3401         hdr->sadb_msg_errno = 0;
3402         hdr->sadb_msg_reserved = 0;
3403         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3404         hdr->sadb_msg_pid = 0;
3405
3406         /* SA */
3407         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3408         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3409         sa->sadb_sa_exttype = SADB_EXT_SA;
3410         sa->sadb_sa_spi = x->id.spi;
3411         sa->sadb_sa_replay = 0;
3412         sa->sadb_sa_state = 0;
3413         sa->sadb_sa_auth = 0;
3414         sa->sadb_sa_encrypt = 0;
3415         sa->sadb_sa_flags = 0;
3416
3417         /* ADDRESS_SRC (old addr) */
3418         addr = (struct sadb_address*)
3419                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3420         addr->sadb_address_len =
3421                 (sizeof(struct sadb_address)+sockaddr_size)/
3422                         sizeof(uint64_t);
3423         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3424         addr->sadb_address_proto = 0;
3425         addr->sadb_address_reserved = 0;
3426         addr->sadb_address_prefixlen =
3427                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3428                                     (struct sockaddr *) (addr + 1),
3429                                     x->props.family);
3430         if (!addr->sadb_address_prefixlen)
3431                 BUG();
3432
3433         /* NAT_T_SPORT (old port) */
3434         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3435         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3436         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3437         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3438         n_port->sadb_x_nat_t_port_reserved = 0;
3439
3440         /* ADDRESS_DST (new addr) */
3441         addr = (struct sadb_address*)
3442                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3443         addr->sadb_address_len =
3444                 (sizeof(struct sadb_address)+sockaddr_size)/
3445                         sizeof(uint64_t);
3446         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3447         addr->sadb_address_proto = 0;
3448         addr->sadb_address_reserved = 0;
3449         addr->sadb_address_prefixlen =
3450                 pfkey_sockaddr_fill(ipaddr, 0,
3451                                     (struct sockaddr *) (addr + 1),
3452                                     x->props.family);
3453         if (!addr->sadb_address_prefixlen)
3454                 BUG();
3455
3456         /* NAT_T_DPORT (new port) */
3457         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3458         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3459         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3460         n_port->sadb_x_nat_t_port_port = sport;
3461         n_port->sadb_x_nat_t_port_reserved = 0;
3462
3463         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3464                                xs_net(x));
3465 }
3466
3467 #ifdef CONFIG_NET_KEY_MIGRATE
3468 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3469                             const struct xfrm_selector *sel)
3470 {
3471         struct sadb_address *addr;
3472         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3473         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3474         addr->sadb_address_exttype = type;
3475         addr->sadb_address_proto = sel->proto;
3476         addr->sadb_address_reserved = 0;
3477
3478         switch (type) {
3479         case SADB_EXT_ADDRESS_SRC:
3480                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3481                 pfkey_sockaddr_fill(&sel->saddr, 0,
3482                                     (struct sockaddr *)(addr + 1),
3483                                     sel->family);
3484                 break;
3485         case SADB_EXT_ADDRESS_DST:
3486                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3487                 pfkey_sockaddr_fill(&sel->daddr, 0,
3488                                     (struct sockaddr *)(addr + 1),
3489                                     sel->family);
3490                 break;
3491         default:
3492                 return -EINVAL;
3493         }
3494
3495         return 0;
3496 }
3497
3498
3499 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3500 {
3501         struct sadb_x_kmaddress *kma;
3502         u8 *sa;
3503         int family = k->family;
3504         int socklen = pfkey_sockaddr_len(family);
3505         int size_req;
3506
3507         size_req = (sizeof(struct sadb_x_kmaddress) +
3508                     pfkey_sockaddr_pair_size(family));
3509
3510         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3511         memset(kma, 0, size_req);
3512         kma->sadb_x_kmaddress_len = size_req / 8;
3513         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3514         kma->sadb_x_kmaddress_reserved = k->reserved;
3515
3516         sa = (u8 *)(kma + 1);
3517         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3518             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3519                 return -EINVAL;
3520
3521         return 0;
3522 }
3523
3524 static int set_ipsecrequest(struct sk_buff *skb,
3525                             uint8_t proto, uint8_t mode, int level,
3526                             uint32_t reqid, uint8_t family,
3527                             const xfrm_address_t *src, const xfrm_address_t *dst)
3528 {
3529         struct sadb_x_ipsecrequest *rq;
3530         u8 *sa;
3531         int socklen = pfkey_sockaddr_len(family);
3532         int size_req;
3533
3534         size_req = sizeof(struct sadb_x_ipsecrequest) +
3535                    pfkey_sockaddr_pair_size(family);
3536
3537         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3538         memset(rq, 0, size_req);
3539         rq->sadb_x_ipsecrequest_len = size_req;
3540         rq->sadb_x_ipsecrequest_proto = proto;
3541         rq->sadb_x_ipsecrequest_mode = mode;
3542         rq->sadb_x_ipsecrequest_level = level;
3543         rq->sadb_x_ipsecrequest_reqid = reqid;
3544
3545         sa = (u8 *) (rq + 1);
3546         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3547             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3548                 return -EINVAL;
3549
3550         return 0;
3551 }
3552 #endif
3553
3554 #ifdef CONFIG_NET_KEY_MIGRATE
3555 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3556                               const struct xfrm_migrate *m, int num_bundles,
3557                               const struct xfrm_kmaddress *k)
3558 {
3559         int i;
3560         int sasize_sel;
3561         int size = 0;
3562         int size_pol = 0;
3563         struct sk_buff *skb;
3564         struct sadb_msg *hdr;
3565         struct sadb_x_policy *pol;
3566         const struct xfrm_migrate *mp;
3567
3568         if (type != XFRM_POLICY_TYPE_MAIN)
3569                 return 0;
3570
3571         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3572                 return -EINVAL;
3573
3574         if (k != NULL) {
3575                 /* addresses for KM */
3576                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3577                                      pfkey_sockaddr_pair_size(k->family));
3578         }
3579
3580         /* selector */
3581         sasize_sel = pfkey_sockaddr_size(sel->family);
3582         if (!sasize_sel)
3583                 return -EINVAL;
3584         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3585
3586         /* policy info */
3587         size_pol += sizeof(struct sadb_x_policy);
3588
3589         /* ipsecrequests */
3590         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3591                 /* old locator pair */
3592                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3593                             pfkey_sockaddr_pair_size(mp->old_family);
3594                 /* new locator pair */
3595                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3596                             pfkey_sockaddr_pair_size(mp->new_family);
3597         }
3598
3599         size += sizeof(struct sadb_msg) + size_pol;
3600
3601         /* alloc buffer */
3602         skb = alloc_skb(size, GFP_ATOMIC);
3603         if (skb == NULL)
3604                 return -ENOMEM;
3605
3606         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3607         hdr->sadb_msg_version = PF_KEY_V2;
3608         hdr->sadb_msg_type = SADB_X_MIGRATE;
3609         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3610         hdr->sadb_msg_len = size / 8;
3611         hdr->sadb_msg_errno = 0;
3612         hdr->sadb_msg_reserved = 0;
3613         hdr->sadb_msg_seq = 0;
3614         hdr->sadb_msg_pid = 0;
3615
3616         /* Addresses to be used by KM for negotiation, if ext is available */
3617         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3618                 goto err;
3619
3620         /* selector src */
3621         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3622
3623         /* selector dst */
3624         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3625
3626         /* policy information */
3627         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3628         pol->sadb_x_policy_len = size_pol / 8;
3629         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3630         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3631         pol->sadb_x_policy_dir = dir + 1;
3632         pol->sadb_x_policy_reserved = 0;
3633         pol->sadb_x_policy_id = 0;
3634         pol->sadb_x_policy_priority = 0;
3635
3636         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3637                 /* old ipsecrequest */
3638                 int mode = pfkey_mode_from_xfrm(mp->mode);
3639                 if (mode < 0)
3640                         goto err;
3641                 if (set_ipsecrequest(skb, mp->proto, mode,
3642                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3643                                      mp->reqid, mp->old_family,
3644                                      &mp->old_saddr, &mp->old_daddr) < 0)
3645                         goto err;
3646
3647                 /* new ipsecrequest */
3648                 if (set_ipsecrequest(skb, mp->proto, mode,
3649                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3650                                      mp->reqid, mp->new_family,
3651                                      &mp->new_saddr, &mp->new_daddr) < 0)
3652                         goto err;
3653         }
3654
3655         /* broadcast migrate message to sockets */
3656         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3657
3658         return 0;
3659
3660 err:
3661         kfree_skb(skb);
3662         return -EINVAL;
3663 }
3664 #else
3665 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3666                               const struct xfrm_migrate *m, int num_bundles,
3667                               const struct xfrm_kmaddress *k)
3668 {
3669         return -ENOPROTOOPT;
3670 }
3671 #endif
3672
3673 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3674 {
3675         struct sock *sk = sock->sk;
3676         struct sk_buff *skb = NULL;
3677         struct sadb_msg *hdr = NULL;
3678         int err;
3679         struct net *net = sock_net(sk);
3680
3681         err = -EOPNOTSUPP;
3682         if (msg->msg_flags & MSG_OOB)
3683                 goto out;
3684
3685         err = -EMSGSIZE;
3686         if ((unsigned int)len > sk->sk_sndbuf - 32)
3687                 goto out;
3688
3689         err = -ENOBUFS;
3690         skb = alloc_skb(len, GFP_KERNEL);
3691         if (skb == NULL)
3692                 goto out;
3693
3694         err = -EFAULT;
3695         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3696                 goto out;
3697
3698         hdr = pfkey_get_base_msg(skb, &err);
3699         if (!hdr)
3700                 goto out;
3701
3702         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3703         err = pfkey_process(sk, skb, hdr);
3704         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3705
3706 out:
3707         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3708                 err = 0;
3709         kfree_skb(skb);
3710
3711         return err ? : len;
3712 }
3713
3714 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3715                          int flags)
3716 {
3717         struct sock *sk = sock->sk;
3718         struct pfkey_sock *pfk = pfkey_sk(sk);
3719         struct sk_buff *skb;
3720         int copied, err;
3721
3722         err = -EINVAL;
3723         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3724                 goto out;
3725
3726         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3727         if (skb == NULL)
3728                 goto out;
3729
3730         copied = skb->len;
3731         if (copied > len) {
3732                 msg->msg_flags |= MSG_TRUNC;
3733                 copied = len;
3734         }
3735
3736         skb_reset_transport_header(skb);
3737         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3738         if (err)
3739                 goto out_free;
3740
3741         sock_recv_ts_and_drops(msg, sk, skb);
3742
3743         err = (flags & MSG_TRUNC) ? skb->len : copied;
3744
3745         if (pfk->dump.dump != NULL &&
3746             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3747                 pfkey_do_dump(pfk);
3748
3749 out_free:
3750         skb_free_datagram(sk, skb);
3751 out:
3752         return err;
3753 }
3754
3755 static const struct proto_ops pfkey_ops = {
3756         .family         =       PF_KEY,
3757         .owner          =       THIS_MODULE,
3758         /* Operations that make no sense on pfkey sockets. */
3759         .bind           =       sock_no_bind,
3760         .connect        =       sock_no_connect,
3761         .socketpair     =       sock_no_socketpair,
3762         .accept         =       sock_no_accept,
3763         .getname        =       sock_no_getname,
3764         .ioctl          =       sock_no_ioctl,
3765         .listen         =       sock_no_listen,
3766         .shutdown       =       sock_no_shutdown,
3767         .setsockopt     =       sock_no_setsockopt,
3768         .getsockopt     =       sock_no_getsockopt,
3769         .mmap           =       sock_no_mmap,
3770         .sendpage       =       sock_no_sendpage,
3771
3772         /* Now the operations that really occur. */
3773         .release        =       pfkey_release,
3774         .poll           =       datagram_poll,
3775         .sendmsg        =       pfkey_sendmsg,
3776         .recvmsg        =       pfkey_recvmsg,
3777 };
3778
3779 static const struct net_proto_family pfkey_family_ops = {
3780         .family =       PF_KEY,
3781         .create =       pfkey_create,
3782         .owner  =       THIS_MODULE,
3783 };
3784
3785 #ifdef CONFIG_PROC_FS
3786 static int pfkey_seq_show(struct seq_file *f, void *v)
3787 {
3788         struct sock *s = sk_entry(v);
3789
3790         if (v == SEQ_START_TOKEN)
3791                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3792         else
3793                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3794                                s,
3795                                atomic_read(&s->sk_refcnt),
3796                                sk_rmem_alloc_get(s),
3797                                sk_wmem_alloc_get(s),
3798                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3799                                sock_i_ino(s)
3800                                );
3801         return 0;
3802 }
3803
3804 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3805         __acquires(rcu)
3806 {
3807         struct net *net = seq_file_net(f);
3808         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3809
3810         rcu_read_lock();
3811         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3812 }
3813
3814 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3815 {
3816         struct net *net = seq_file_net(f);
3817         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3818
3819         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3820 }
3821
3822 static void pfkey_seq_stop(struct seq_file *f, void *v)
3823         __releases(rcu)
3824 {
3825         rcu_read_unlock();
3826 }
3827
3828 static const struct seq_operations pfkey_seq_ops = {
3829         .start  = pfkey_seq_start,
3830         .next   = pfkey_seq_next,
3831         .stop   = pfkey_seq_stop,
3832         .show   = pfkey_seq_show,
3833 };
3834
3835 static int pfkey_seq_open(struct inode *inode, struct file *file)
3836 {
3837         return seq_open_net(inode, file, &pfkey_seq_ops,
3838                             sizeof(struct seq_net_private));
3839 }
3840
3841 static const struct file_operations pfkey_proc_ops = {
3842         .open    = pfkey_seq_open,
3843         .read    = seq_read,
3844         .llseek  = seq_lseek,
3845         .release = seq_release_net,
3846 };
3847
3848 static int __net_init pfkey_init_proc(struct net *net)
3849 {
3850         struct proc_dir_entry *e;
3851
3852         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3853         if (e == NULL)
3854                 return -ENOMEM;
3855
3856         return 0;
3857 }
3858
3859 static void __net_exit pfkey_exit_proc(struct net *net)
3860 {
3861         remove_proc_entry("pfkey", net->proc_net);
3862 }
3863 #else
3864 static inline int pfkey_init_proc(struct net *net)
3865 {
3866         return 0;
3867 }
3868
3869 static inline void pfkey_exit_proc(struct net *net)
3870 {
3871 }
3872 #endif
3873
3874 static struct xfrm_mgr pfkeyv2_mgr =
3875 {
3876         .id             = "pfkeyv2",
3877         .notify         = pfkey_send_notify,
3878         .acquire        = pfkey_send_acquire,
3879         .compile_policy = pfkey_compile_policy,
3880         .new_mapping    = pfkey_send_new_mapping,
3881         .notify_policy  = pfkey_send_policy_notify,
3882         .migrate        = pfkey_send_migrate,
3883         .is_alive       = pfkey_is_alive,
3884 };
3885
3886 static int __net_init pfkey_net_init(struct net *net)
3887 {
3888         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3889         int rv;
3890
3891         INIT_HLIST_HEAD(&net_pfkey->table);
3892         atomic_set(&net_pfkey->socks_nr, 0);
3893
3894         rv = pfkey_init_proc(net);
3895
3896         return rv;
3897 }
3898
3899 static void __net_exit pfkey_net_exit(struct net *net)
3900 {
3901         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3902
3903         pfkey_exit_proc(net);
3904         BUG_ON(!hlist_empty(&net_pfkey->table));
3905 }
3906
3907 static struct pernet_operations pfkey_net_ops = {
3908         .init = pfkey_net_init,
3909         .exit = pfkey_net_exit,
3910         .id   = &pfkey_net_id,
3911         .size = sizeof(struct netns_pfkey),
3912 };
3913
3914 static void __exit ipsec_pfkey_exit(void)
3915 {
3916         xfrm_unregister_km(&pfkeyv2_mgr);
3917         sock_unregister(PF_KEY);
3918         unregister_pernet_subsys(&pfkey_net_ops);
3919         proto_unregister(&key_proto);
3920 }
3921
3922 static int __init ipsec_pfkey_init(void)
3923 {
3924         int err = proto_register(&key_proto, 0);
3925
3926         if (err != 0)
3927                 goto out;
3928
3929         err = register_pernet_subsys(&pfkey_net_ops);
3930         if (err != 0)
3931                 goto out_unregister_key_proto;
3932         err = sock_register(&pfkey_family_ops);
3933         if (err != 0)
3934                 goto out_unregister_pernet;
3935         err = xfrm_register_km(&pfkeyv2_mgr);
3936         if (err != 0)
3937                 goto out_sock_unregister;
3938 out:
3939         return err;
3940
3941 out_sock_unregister:
3942         sock_unregister(PF_KEY);
3943 out_unregister_pernet:
3944         unregister_pernet_subsys(&pfkey_net_ops);
3945 out_unregister_key_proto:
3946         proto_unregister(&key_proto);
3947         goto out;
3948 }
3949
3950 module_init(ipsec_pfkey_init);
3951 module_exit(ipsec_pfkey_exit);
3952 MODULE_LICENSE("GPL");
3953 MODULE_ALIAS_NETPROTO(PF_KEY);