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         mutex_lock(&pfkey_mutex);
1728         xfrm_probe_algs();
1729
1730         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO);
1731         mutex_unlock(&pfkey_mutex);
1732
1733         if (!supp_skb) {
1734                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1735                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1736
1737                 return -ENOBUFS;
1738         }
1739
1740         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1741                         sock_net(sk));
1742         return 0;
1743 }
1744
1745 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1746 {
1747         struct sk_buff *skb;
1748         struct sadb_msg *hdr;
1749
1750         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1751         if (!skb)
1752                 return -ENOBUFS;
1753
1754         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1755         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1756         hdr->sadb_msg_errno = (uint8_t) 0;
1757         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1758
1759         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1760                                sock_net(sk));
1761 }
1762
1763 static int key_notify_sa_flush(const struct km_event *c)
1764 {
1765         struct sk_buff *skb;
1766         struct sadb_msg *hdr;
1767
1768         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1769         if (!skb)
1770                 return -ENOBUFS;
1771         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1772         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1773         hdr->sadb_msg_type = SADB_FLUSH;
1774         hdr->sadb_msg_seq = c->seq;
1775         hdr->sadb_msg_pid = c->portid;
1776         hdr->sadb_msg_version = PF_KEY_V2;
1777         hdr->sadb_msg_errno = (uint8_t) 0;
1778         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1779         hdr->sadb_msg_reserved = 0;
1780
1781         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1782
1783         return 0;
1784 }
1785
1786 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1787 {
1788         struct net *net = sock_net(sk);
1789         unsigned int proto;
1790         struct km_event c;
1791         int err, err2;
1792
1793         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1794         if (proto == 0)
1795                 return -EINVAL;
1796
1797         err = xfrm_state_flush(net, proto, true);
1798         err2 = unicast_flush_resp(sk, hdr);
1799         if (err || err2) {
1800                 if (err == -ESRCH) /* empty table - go quietly */
1801                         err = 0;
1802                 return err ? err : err2;
1803         }
1804
1805         c.data.proto = proto;
1806         c.seq = hdr->sadb_msg_seq;
1807         c.portid = hdr->sadb_msg_pid;
1808         c.event = XFRM_MSG_FLUSHSA;
1809         c.net = net;
1810         km_state_notify(NULL, &c);
1811
1812         return 0;
1813 }
1814
1815 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1816 {
1817         struct pfkey_sock *pfk = ptr;
1818         struct sk_buff *out_skb;
1819         struct sadb_msg *out_hdr;
1820
1821         if (!pfkey_can_dump(&pfk->sk))
1822                 return -ENOBUFS;
1823
1824         out_skb = pfkey_xfrm_state2msg(x);
1825         if (IS_ERR(out_skb))
1826                 return PTR_ERR(out_skb);
1827
1828         out_hdr = (struct sadb_msg *) out_skb->data;
1829         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1830         out_hdr->sadb_msg_type = SADB_DUMP;
1831         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1832         out_hdr->sadb_msg_errno = 0;
1833         out_hdr->sadb_msg_reserved = 0;
1834         out_hdr->sadb_msg_seq = count + 1;
1835         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1836
1837         if (pfk->dump.skb)
1838                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1839                                 &pfk->sk, sock_net(&pfk->sk));
1840         pfk->dump.skb = out_skb;
1841
1842         return 0;
1843 }
1844
1845 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1846 {
1847         struct net *net = sock_net(&pfk->sk);
1848         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1849 }
1850
1851 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1852 {
1853         struct net *net = sock_net(&pfk->sk);
1854
1855         xfrm_state_walk_done(&pfk->dump.u.state, net);
1856 }
1857
1858 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1859 {
1860         u8 proto;
1861         struct xfrm_address_filter *filter = NULL;
1862         struct pfkey_sock *pfk = pfkey_sk(sk);
1863
1864         mutex_lock(&pfk->dump_lock);
1865         if (pfk->dump.dump != NULL) {
1866                 mutex_unlock(&pfk->dump_lock);
1867                 return -EBUSY;
1868         }
1869
1870         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1871         if (proto == 0) {
1872                 mutex_unlock(&pfk->dump_lock);
1873                 return -EINVAL;
1874         }
1875
1876         if (ext_hdrs[SADB_X_EXT_FILTER - 1]) {
1877                 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1];
1878
1879                 if ((xfilter->sadb_x_filter_splen >=
1880                         (sizeof(xfrm_address_t) << 3)) ||
1881                     (xfilter->sadb_x_filter_dplen >=
1882                         (sizeof(xfrm_address_t) << 3))) {
1883                         mutex_unlock(&pfk->dump_lock);
1884                         return -EINVAL;
1885                 }
1886                 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
1887                 if (filter == NULL) {
1888                         mutex_unlock(&pfk->dump_lock);
1889                         return -ENOMEM;
1890                 }
1891
1892                 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr,
1893                        sizeof(xfrm_address_t));
1894                 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr,
1895                        sizeof(xfrm_address_t));
1896                 filter->family = xfilter->sadb_x_filter_family;
1897                 filter->splen = xfilter->sadb_x_filter_splen;
1898                 filter->dplen = xfilter->sadb_x_filter_dplen;
1899         }
1900
1901         pfk->dump.msg_version = hdr->sadb_msg_version;
1902         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1903         pfk->dump.dump = pfkey_dump_sa;
1904         pfk->dump.done = pfkey_dump_sa_done;
1905         xfrm_state_walk_init(&pfk->dump.u.state, proto, filter);
1906         mutex_unlock(&pfk->dump_lock);
1907
1908         return pfkey_do_dump(pfk);
1909 }
1910
1911 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1912 {
1913         struct pfkey_sock *pfk = pfkey_sk(sk);
1914         int satype = hdr->sadb_msg_satype;
1915         bool reset_errno = false;
1916
1917         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1918                 reset_errno = true;
1919                 if (satype != 0 && satype != 1)
1920                         return -EINVAL;
1921                 pfk->promisc = satype;
1922         }
1923         if (reset_errno && skb_cloned(skb))
1924                 skb = skb_copy(skb, GFP_KERNEL);
1925         else
1926                 skb = skb_clone(skb, GFP_KERNEL);
1927
1928         if (reset_errno && skb) {
1929                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1930                 new_hdr->sadb_msg_errno = 0;
1931         }
1932
1933         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1934         return 0;
1935 }
1936
1937 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1938 {
1939         int i;
1940         u32 reqid = *(u32*)ptr;
1941
1942         for (i=0; i<xp->xfrm_nr; i++) {
1943                 if (xp->xfrm_vec[i].reqid == reqid)
1944                         return -EEXIST;
1945         }
1946         return 0;
1947 }
1948
1949 static u32 gen_reqid(struct net *net)
1950 {
1951         struct xfrm_policy_walk walk;
1952         u32 start;
1953         int rc;
1954         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1955
1956         start = reqid;
1957         do {
1958                 ++reqid;
1959                 if (reqid == 0)
1960                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1961                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1962                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1963                 xfrm_policy_walk_done(&walk, net);
1964                 if (rc != -EEXIST)
1965                         return reqid;
1966         } while (reqid != start);
1967         return 0;
1968 }
1969
1970 static int
1971 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1972 {
1973         struct net *net = xp_net(xp);
1974         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1975         int mode;
1976
1977         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1978                 return -ELOOP;
1979
1980         if (rq->sadb_x_ipsecrequest_mode == 0)
1981                 return -EINVAL;
1982         if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto))
1983                 return -EINVAL;
1984
1985         t->id.proto = rq->sadb_x_ipsecrequest_proto;
1986         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1987                 return -EINVAL;
1988         t->mode = mode;
1989         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1990                 t->optional = 1;
1991         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1992                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1993                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1994                         t->reqid = 0;
1995                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1996                         return -ENOBUFS;
1997         }
1998
1999         /* addresses present only in tunnel mode */
2000         if (t->mode == XFRM_MODE_TUNNEL) {
2001                 int err;
2002
2003                 err = parse_sockaddr_pair(
2004                         (struct sockaddr *)(rq + 1),
2005                         rq->sadb_x_ipsecrequest_len - sizeof(*rq),
2006                         &t->saddr, &t->id.daddr, &t->encap_family);
2007                 if (err)
2008                         return err;
2009         } else
2010                 t->encap_family = xp->family;
2011
2012         /* No way to set this via kame pfkey */
2013         t->allalgs = 1;
2014         xp->xfrm_nr++;
2015         return 0;
2016 }
2017
2018 static int
2019 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
2020 {
2021         int err;
2022         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
2023         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
2024
2025         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
2026                 return -EINVAL;
2027
2028         while (len >= sizeof(*rq)) {
2029                 if (len < rq->sadb_x_ipsecrequest_len ||
2030                     rq->sadb_x_ipsecrequest_len < sizeof(*rq))
2031                         return -EINVAL;
2032
2033                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
2034                         return err;
2035                 len -= rq->sadb_x_ipsecrequest_len;
2036                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
2037         }
2038         return 0;
2039 }
2040
2041 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
2042 {
2043   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
2044
2045         if (xfrm_ctx) {
2046                 int len = sizeof(struct sadb_x_sec_ctx);
2047                 len += xfrm_ctx->ctx_len;
2048                 return PFKEY_ALIGN8(len);
2049         }
2050         return 0;
2051 }
2052
2053 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
2054 {
2055         const struct xfrm_tmpl *t;
2056         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2057         int socklen = 0;
2058         int i;
2059
2060         for (i=0; i<xp->xfrm_nr; i++) {
2061                 t = xp->xfrm_vec + i;
2062                 socklen += pfkey_sockaddr_len(t->encap_family);
2063         }
2064
2065         return sizeof(struct sadb_msg) +
2066                 (sizeof(struct sadb_lifetime) * 3) +
2067                 (sizeof(struct sadb_address) * 2) +
2068                 (sockaddr_size * 2) +
2069                 sizeof(struct sadb_x_policy) +
2070                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2071                 (socklen * 2) +
2072                 pfkey_xfrm_policy2sec_ctx_size(xp);
2073 }
2074
2075 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2076 {
2077         struct sk_buff *skb;
2078         int size;
2079
2080         size = pfkey_xfrm_policy2msg_size(xp);
2081
2082         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2083         if (skb == NULL)
2084                 return ERR_PTR(-ENOBUFS);
2085
2086         return skb;
2087 }
2088
2089 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2090 {
2091         struct sadb_msg *hdr;
2092         struct sadb_address *addr;
2093         struct sadb_lifetime *lifetime;
2094         struct sadb_x_policy *pol;
2095         struct sadb_x_sec_ctx *sec_ctx;
2096         struct xfrm_sec_ctx *xfrm_ctx;
2097         int i;
2098         int size;
2099         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2100         int socklen = pfkey_sockaddr_len(xp->family);
2101
2102         size = pfkey_xfrm_policy2msg_size(xp);
2103
2104         /* call should fill header later */
2105         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2106         memset(hdr, 0, size);   /* XXX do we need this ? */
2107
2108         /* src address */
2109         addr = (struct sadb_address*) skb_put(skb,
2110                                               sizeof(struct sadb_address)+sockaddr_size);
2111         addr->sadb_address_len =
2112                 (sizeof(struct sadb_address)+sockaddr_size)/
2113                         sizeof(uint64_t);
2114         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2115         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2116         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2117         addr->sadb_address_reserved = 0;
2118         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2119                                  xp->selector.sport,
2120                                  (struct sockaddr *) (addr + 1),
2121                                  xp->family))
2122                 BUG();
2123
2124         /* dst address */
2125         addr = (struct sadb_address*) skb_put(skb,
2126                                               sizeof(struct sadb_address)+sockaddr_size);
2127         addr->sadb_address_len =
2128                 (sizeof(struct sadb_address)+sockaddr_size)/
2129                         sizeof(uint64_t);
2130         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2131         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2132         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2133         addr->sadb_address_reserved = 0;
2134
2135         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2136                             (struct sockaddr *) (addr + 1),
2137                             xp->family);
2138
2139         /* hard time */
2140         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2141                                                      sizeof(struct sadb_lifetime));
2142         lifetime->sadb_lifetime_len =
2143                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2144         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2145         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2146         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2147         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2148         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2149         /* soft time */
2150         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2151                                                      sizeof(struct sadb_lifetime));
2152         lifetime->sadb_lifetime_len =
2153                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2154         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2155         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2156         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2157         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2158         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2159         /* current time */
2160         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2161                                                      sizeof(struct sadb_lifetime));
2162         lifetime->sadb_lifetime_len =
2163                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2164         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2165         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2166         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2167         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2168         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2169
2170         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2171         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2172         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2173         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2174         if (xp->action == XFRM_POLICY_ALLOW) {
2175                 if (xp->xfrm_nr)
2176                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2177                 else
2178                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2179         }
2180         pol->sadb_x_policy_dir = dir+1;
2181         pol->sadb_x_policy_reserved = 0;
2182         pol->sadb_x_policy_id = xp->index;
2183         pol->sadb_x_policy_priority = xp->priority;
2184
2185         for (i=0; i<xp->xfrm_nr; i++) {
2186                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2187                 struct sadb_x_ipsecrequest *rq;
2188                 int req_size;
2189                 int mode;
2190
2191                 req_size = sizeof(struct sadb_x_ipsecrequest);
2192                 if (t->mode == XFRM_MODE_TUNNEL) {
2193                         socklen = pfkey_sockaddr_len(t->encap_family);
2194                         req_size += socklen * 2;
2195                 } else {
2196                         size -= 2*socklen;
2197                 }
2198                 rq = (void*)skb_put(skb, req_size);
2199                 pol->sadb_x_policy_len += req_size/8;
2200                 memset(rq, 0, sizeof(*rq));
2201                 rq->sadb_x_ipsecrequest_len = req_size;
2202                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2203                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2204                         return -EINVAL;
2205                 rq->sadb_x_ipsecrequest_mode = mode;
2206                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2207                 if (t->reqid)
2208                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2209                 if (t->optional)
2210                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2211                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2212
2213                 if (t->mode == XFRM_MODE_TUNNEL) {
2214                         u8 *sa = (void *)(rq + 1);
2215                         pfkey_sockaddr_fill(&t->saddr, 0,
2216                                             (struct sockaddr *)sa,
2217                                             t->encap_family);
2218                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2219                                             (struct sockaddr *) (sa + socklen),
2220                                             t->encap_family);
2221                 }
2222         }
2223
2224         /* security context */
2225         if ((xfrm_ctx = xp->security)) {
2226                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2227
2228                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2229                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2230                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2231                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2232                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2233                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2234                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2235                        xfrm_ctx->ctx_len);
2236         }
2237
2238         hdr->sadb_msg_len = size / sizeof(uint64_t);
2239         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2240
2241         return 0;
2242 }
2243
2244 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2245 {
2246         struct sk_buff *out_skb;
2247         struct sadb_msg *out_hdr;
2248         int err;
2249
2250         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2251         if (IS_ERR(out_skb))
2252                 return PTR_ERR(out_skb);
2253
2254         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2255         if (err < 0)
2256                 return err;
2257
2258         out_hdr = (struct sadb_msg *) out_skb->data;
2259         out_hdr->sadb_msg_version = PF_KEY_V2;
2260
2261         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2262                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2263         else
2264                 out_hdr->sadb_msg_type = event2poltype(c->event);
2265         out_hdr->sadb_msg_errno = 0;
2266         out_hdr->sadb_msg_seq = c->seq;
2267         out_hdr->sadb_msg_pid = c->portid;
2268         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2269         return 0;
2270
2271 }
2272
2273 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2274 {
2275         struct net *net = sock_net(sk);
2276         int err = 0;
2277         struct sadb_lifetime *lifetime;
2278         struct sadb_address *sa;
2279         struct sadb_x_policy *pol;
2280         struct xfrm_policy *xp;
2281         struct km_event c;
2282         struct sadb_x_sec_ctx *sec_ctx;
2283
2284         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2285                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2286             !ext_hdrs[SADB_X_EXT_POLICY-1])
2287                 return -EINVAL;
2288
2289         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2290         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2291                 return -EINVAL;
2292         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2293                 return -EINVAL;
2294
2295         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2296         if (xp == NULL)
2297                 return -ENOBUFS;
2298
2299         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2300                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2301         xp->priority = pol->sadb_x_policy_priority;
2302
2303         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2304         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2305         xp->selector.family = xp->family;
2306         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2307         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2308         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2309         if (xp->selector.sport)
2310                 xp->selector.sport_mask = htons(0xffff);
2311
2312         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2313         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2314         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2315
2316         /* Amusing, we set this twice.  KAME apps appear to set same value
2317          * in both addresses.
2318          */
2319         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2320
2321         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2322         if (xp->selector.dport)
2323                 xp->selector.dport_mask = htons(0xffff);
2324
2325         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2326         if (sec_ctx != NULL) {
2327                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2328
2329                 if (!uctx) {
2330                         err = -ENOBUFS;
2331                         goto out;
2332                 }
2333
2334                 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL);
2335                 kfree(uctx);
2336
2337                 if (err)
2338                         goto out;
2339         }
2340
2341         xp->lft.soft_byte_limit = XFRM_INF;
2342         xp->lft.hard_byte_limit = XFRM_INF;
2343         xp->lft.soft_packet_limit = XFRM_INF;
2344         xp->lft.hard_packet_limit = XFRM_INF;
2345         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2346                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2347                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2348                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2349                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2350         }
2351         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2352                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2353                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2354                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2355                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2356         }
2357         xp->xfrm_nr = 0;
2358         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2359             (err = parse_ipsecrequests(xp, pol)) < 0)
2360                 goto out;
2361
2362         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2363                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2364
2365         xfrm_audit_policy_add(xp, err ? 0 : 1, true);
2366
2367         if (err)
2368                 goto out;
2369
2370         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2371                 c.event = XFRM_MSG_UPDPOLICY;
2372         else
2373                 c.event = XFRM_MSG_NEWPOLICY;
2374
2375         c.seq = hdr->sadb_msg_seq;
2376         c.portid = hdr->sadb_msg_pid;
2377
2378         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2379         xfrm_pol_put(xp);
2380         return 0;
2381
2382 out:
2383         xp->walk.dead = 1;
2384         xfrm_policy_destroy(xp);
2385         return err;
2386 }
2387
2388 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2389 {
2390         struct net *net = sock_net(sk);
2391         int err;
2392         struct sadb_address *sa;
2393         struct sadb_x_policy *pol;
2394         struct xfrm_policy *xp;
2395         struct xfrm_selector sel;
2396         struct km_event c;
2397         struct sadb_x_sec_ctx *sec_ctx;
2398         struct xfrm_sec_ctx *pol_ctx = NULL;
2399
2400         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2401                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2402             !ext_hdrs[SADB_X_EXT_POLICY-1])
2403                 return -EINVAL;
2404
2405         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2406         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2407                 return -EINVAL;
2408
2409         memset(&sel, 0, sizeof(sel));
2410
2411         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2412         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2413         sel.prefixlen_s = sa->sadb_address_prefixlen;
2414         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2415         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2416         if (sel.sport)
2417                 sel.sport_mask = htons(0xffff);
2418
2419         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2420         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2421         sel.prefixlen_d = sa->sadb_address_prefixlen;
2422         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2423         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2424         if (sel.dport)
2425                 sel.dport_mask = htons(0xffff);
2426
2427         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2428         if (sec_ctx != NULL) {
2429                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL);
2430
2431                 if (!uctx)
2432                         return -ENOMEM;
2433
2434                 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL);
2435                 kfree(uctx);
2436                 if (err)
2437                         return err;
2438         }
2439
2440         xp = xfrm_policy_bysel_ctx(net, &dummy_mark, XFRM_POLICY_TYPE_MAIN,
2441                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2442                                    1, &err);
2443         security_xfrm_policy_free(pol_ctx);
2444         if (xp == NULL)
2445                 return -ENOENT;
2446
2447         xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2448
2449         if (err)
2450                 goto out;
2451
2452         c.seq = hdr->sadb_msg_seq;
2453         c.portid = hdr->sadb_msg_pid;
2454         c.data.byid = 0;
2455         c.event = XFRM_MSG_DELPOLICY;
2456         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2457
2458 out:
2459         xfrm_pol_put(xp);
2460         if (err == 0)
2461                 xfrm_garbage_collect(net);
2462         return err;
2463 }
2464
2465 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2466 {
2467         int err;
2468         struct sk_buff *out_skb;
2469         struct sadb_msg *out_hdr;
2470         err = 0;
2471
2472         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2473         if (IS_ERR(out_skb)) {
2474                 err =  PTR_ERR(out_skb);
2475                 goto out;
2476         }
2477         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2478         if (err < 0) {
2479                 kfree_skb(out_skb);
2480                 goto out;
2481         }
2482
2483         out_hdr = (struct sadb_msg *) out_skb->data;
2484         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2485         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2486         out_hdr->sadb_msg_satype = 0;
2487         out_hdr->sadb_msg_errno = 0;
2488         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2489         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2490         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2491         err = 0;
2492
2493 out:
2494         return err;
2495 }
2496
2497 static int pfkey_sockaddr_pair_size(sa_family_t family)
2498 {
2499         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2500 }
2501
2502 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2503                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2504                                u16 *family)
2505 {
2506         int af, socklen;
2507
2508         if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2509                 return -EINVAL;
2510
2511         af = pfkey_sockaddr_extract(sa, saddr);
2512         if (!af)
2513                 return -EINVAL;
2514
2515         socklen = pfkey_sockaddr_len(af);
2516         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2517                                    daddr) != af)
2518                 return -EINVAL;
2519
2520         *family = af;
2521         return 0;
2522 }
2523
2524 #ifdef CONFIG_NET_KEY_MIGRATE
2525 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2526                                     struct xfrm_migrate *m)
2527 {
2528         int err;
2529         struct sadb_x_ipsecrequest *rq2;
2530         int mode;
2531
2532         if (len < sizeof(*rq1) ||
2533             len < rq1->sadb_x_ipsecrequest_len ||
2534             rq1->sadb_x_ipsecrequest_len < sizeof(*rq1))
2535                 return -EINVAL;
2536
2537         /* old endoints */
2538         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2539                                   rq1->sadb_x_ipsecrequest_len - sizeof(*rq1),
2540                                   &m->old_saddr, &m->old_daddr,
2541                                   &m->old_family);
2542         if (err)
2543                 return err;
2544
2545         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2546         len -= rq1->sadb_x_ipsecrequest_len;
2547
2548         if (len <= sizeof(*rq2) ||
2549             len < rq2->sadb_x_ipsecrequest_len ||
2550             rq2->sadb_x_ipsecrequest_len < sizeof(*rq2))
2551                 return -EINVAL;
2552
2553         /* new endpoints */
2554         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2555                                   rq2->sadb_x_ipsecrequest_len - sizeof(*rq2),
2556                                   &m->new_saddr, &m->new_daddr,
2557                                   &m->new_family);
2558         if (err)
2559                 return err;
2560
2561         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2562             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2563             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2564                 return -EINVAL;
2565
2566         m->proto = rq1->sadb_x_ipsecrequest_proto;
2567         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2568                 return -EINVAL;
2569         m->mode = mode;
2570         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2571
2572         return ((int)(rq1->sadb_x_ipsecrequest_len +
2573                       rq2->sadb_x_ipsecrequest_len));
2574 }
2575
2576 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2577                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2578 {
2579         int i, len, ret, err = -EINVAL;
2580         u8 dir;
2581         struct sadb_address *sa;
2582         struct sadb_x_kmaddress *kma;
2583         struct sadb_x_policy *pol;
2584         struct sadb_x_ipsecrequest *rq;
2585         struct xfrm_selector sel;
2586         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2587         struct xfrm_kmaddress k;
2588         struct net *net = sock_net(sk);
2589
2590         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2591                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2592             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2593                 err = -EINVAL;
2594                 goto out;
2595         }
2596
2597         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2598         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2599
2600         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2601                 err = -EINVAL;
2602                 goto out;
2603         }
2604
2605         if (kma) {
2606                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2607                 k.reserved = kma->sadb_x_kmaddress_reserved;
2608                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2609                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2610                                           &k.local, &k.remote, &k.family);
2611                 if (ret < 0) {
2612                         err = ret;
2613                         goto out;
2614                 }
2615         }
2616
2617         dir = pol->sadb_x_policy_dir - 1;
2618         memset(&sel, 0, sizeof(sel));
2619
2620         /* set source address info of selector */
2621         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2622         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2623         sel.prefixlen_s = sa->sadb_address_prefixlen;
2624         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2625         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2626         if (sel.sport)
2627                 sel.sport_mask = htons(0xffff);
2628
2629         /* set destination address info of selector */
2630         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
2631         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2632         sel.prefixlen_d = sa->sadb_address_prefixlen;
2633         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2634         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2635         if (sel.dport)
2636                 sel.dport_mask = htons(0xffff);
2637
2638         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2639
2640         /* extract ipsecrequests */
2641         i = 0;
2642         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2643
2644         while (len > 0 && i < XFRM_MAX_DEPTH) {
2645                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2646                 if (ret < 0) {
2647                         err = ret;
2648                         goto out;
2649                 } else {
2650                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2651                         len -= ret;
2652                         i++;
2653                 }
2654         }
2655
2656         if (!i || len > 0) {
2657                 err = -EINVAL;
2658                 goto out;
2659         }
2660
2661         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2662                             kma ? &k : NULL, net);
2663
2664  out:
2665         return err;
2666 }
2667 #else
2668 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2669                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2670 {
2671         return -ENOPROTOOPT;
2672 }
2673 #endif
2674
2675
2676 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2677 {
2678         struct net *net = sock_net(sk);
2679         unsigned int dir;
2680         int err = 0, delete;
2681         struct sadb_x_policy *pol;
2682         struct xfrm_policy *xp;
2683         struct km_event c;
2684
2685         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2686                 return -EINVAL;
2687
2688         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2689         if (dir >= XFRM_POLICY_MAX)
2690                 return -EINVAL;
2691
2692         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2693         xp = xfrm_policy_byid(net, &dummy_mark, XFRM_POLICY_TYPE_MAIN,
2694                               dir, pol->sadb_x_policy_id, delete, &err);
2695         if (xp == NULL)
2696                 return -ENOENT;
2697
2698         if (delete) {
2699                 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
2700
2701                 if (err)
2702                         goto out;
2703                 c.seq = hdr->sadb_msg_seq;
2704                 c.portid = hdr->sadb_msg_pid;
2705                 c.data.byid = 1;
2706                 c.event = XFRM_MSG_DELPOLICY;
2707                 km_policy_notify(xp, dir, &c);
2708         } else {
2709                 err = key_pol_get_resp(sk, xp, hdr, dir);
2710         }
2711
2712 out:
2713         xfrm_pol_put(xp);
2714         if (delete && err == 0)
2715                 xfrm_garbage_collect(net);
2716         return err;
2717 }
2718
2719 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2720 {
2721         struct pfkey_sock *pfk = ptr;
2722         struct sk_buff *out_skb;
2723         struct sadb_msg *out_hdr;
2724         int err;
2725
2726         if (!pfkey_can_dump(&pfk->sk))
2727                 return -ENOBUFS;
2728
2729         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2730         if (IS_ERR(out_skb))
2731                 return PTR_ERR(out_skb);
2732
2733         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2734         if (err < 0) {
2735                 kfree_skb(out_skb);
2736                 return err;
2737         }
2738
2739         out_hdr = (struct sadb_msg *) out_skb->data;
2740         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2741         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2742         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2743         out_hdr->sadb_msg_errno = 0;
2744         out_hdr->sadb_msg_seq = count + 1;
2745         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2746
2747         if (pfk->dump.skb)
2748                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2749                                 &pfk->sk, sock_net(&pfk->sk));
2750         pfk->dump.skb = out_skb;
2751
2752         return 0;
2753 }
2754
2755 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2756 {
2757         struct net *net = sock_net(&pfk->sk);
2758         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2759 }
2760
2761 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2762 {
2763         struct net *net = sock_net((struct sock *)pfk);
2764
2765         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2766 }
2767
2768 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2769 {
2770         struct pfkey_sock *pfk = pfkey_sk(sk);
2771
2772         mutex_lock(&pfk->dump_lock);
2773         if (pfk->dump.dump != NULL) {
2774                 mutex_unlock(&pfk->dump_lock);
2775                 return -EBUSY;
2776         }
2777
2778         pfk->dump.msg_version = hdr->sadb_msg_version;
2779         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2780         pfk->dump.dump = pfkey_dump_sp;
2781         pfk->dump.done = pfkey_dump_sp_done;
2782         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2783         mutex_unlock(&pfk->dump_lock);
2784
2785         return pfkey_do_dump(pfk);
2786 }
2787
2788 static int key_notify_policy_flush(const struct km_event *c)
2789 {
2790         struct sk_buff *skb_out;
2791         struct sadb_msg *hdr;
2792
2793         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2794         if (!skb_out)
2795                 return -ENOBUFS;
2796         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2797         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2798         hdr->sadb_msg_seq = c->seq;
2799         hdr->sadb_msg_pid = c->portid;
2800         hdr->sadb_msg_version = PF_KEY_V2;
2801         hdr->sadb_msg_errno = (uint8_t) 0;
2802         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2803         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2804         hdr->sadb_msg_reserved = 0;
2805         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2806         return 0;
2807
2808 }
2809
2810 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2811 {
2812         struct net *net = sock_net(sk);
2813         struct km_event c;
2814         int err, err2;
2815
2816         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true);
2817         err2 = unicast_flush_resp(sk, hdr);
2818         if (err || err2) {
2819                 if (err == -ESRCH) /* empty table - old silent behavior */
2820                         return 0;
2821                 return err;
2822         }
2823
2824         c.data.type = XFRM_POLICY_TYPE_MAIN;
2825         c.event = XFRM_MSG_FLUSHPOLICY;
2826         c.portid = hdr->sadb_msg_pid;
2827         c.seq = hdr->sadb_msg_seq;
2828         c.net = net;
2829         km_policy_notify(NULL, 0, &c);
2830
2831         return 0;
2832 }
2833
2834 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2835                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2836 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2837         [SADB_RESERVED]         = pfkey_reserved,
2838         [SADB_GETSPI]           = pfkey_getspi,
2839         [SADB_UPDATE]           = pfkey_add,
2840         [SADB_ADD]              = pfkey_add,
2841         [SADB_DELETE]           = pfkey_delete,
2842         [SADB_GET]              = pfkey_get,
2843         [SADB_ACQUIRE]          = pfkey_acquire,
2844         [SADB_REGISTER]         = pfkey_register,
2845         [SADB_EXPIRE]           = NULL,
2846         [SADB_FLUSH]            = pfkey_flush,
2847         [SADB_DUMP]             = pfkey_dump,
2848         [SADB_X_PROMISC]        = pfkey_promisc,
2849         [SADB_X_PCHANGE]        = NULL,
2850         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2851         [SADB_X_SPDADD]         = pfkey_spdadd,
2852         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2853         [SADB_X_SPDGET]         = pfkey_spdget,
2854         [SADB_X_SPDACQUIRE]     = NULL,
2855         [SADB_X_SPDDUMP]        = pfkey_spddump,
2856         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2857         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2858         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2859         [SADB_X_MIGRATE]        = pfkey_migrate,
2860 };
2861
2862 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2863 {
2864         void *ext_hdrs[SADB_EXT_MAX];
2865         int err;
2866
2867         /* Non-zero return value of pfkey_broadcast() does not always signal
2868          * an error and even on an actual error we may still want to process
2869          * the message so rather ignore the return value.
2870          */
2871         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2872                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2873
2874         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2875         err = parse_exthdrs(skb, hdr, ext_hdrs);
2876         if (!err) {
2877                 err = -EOPNOTSUPP;
2878                 if (pfkey_funcs[hdr->sadb_msg_type])
2879                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2880         }
2881         return err;
2882 }
2883
2884 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2885 {
2886         struct sadb_msg *hdr = NULL;
2887
2888         if (skb->len < sizeof(*hdr)) {
2889                 *errp = -EMSGSIZE;
2890         } else {
2891                 hdr = (struct sadb_msg *) skb->data;
2892                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2893                     hdr->sadb_msg_reserved != 0 ||
2894                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2895                      hdr->sadb_msg_type > SADB_MAX)) {
2896                         hdr = NULL;
2897                         *errp = -EINVAL;
2898                 } else if (hdr->sadb_msg_len != (skb->len /
2899                                                  sizeof(uint64_t)) ||
2900                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2901                                                 sizeof(uint64_t))) {
2902                         hdr = NULL;
2903                         *errp = -EMSGSIZE;
2904                 } else {
2905                         *errp = 0;
2906                 }
2907         }
2908         return hdr;
2909 }
2910
2911 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2912                                 const struct xfrm_algo_desc *d)
2913 {
2914         unsigned int id = d->desc.sadb_alg_id;
2915
2916         if (id >= sizeof(t->aalgos) * 8)
2917                 return 0;
2918
2919         return (t->aalgos >> id) & 1;
2920 }
2921
2922 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2923                                 const struct xfrm_algo_desc *d)
2924 {
2925         unsigned int id = d->desc.sadb_alg_id;
2926
2927         if (id >= sizeof(t->ealgos) * 8)
2928                 return 0;
2929
2930         return (t->ealgos >> id) & 1;
2931 }
2932
2933 static int count_ah_combs(const struct xfrm_tmpl *t)
2934 {
2935         int i, sz = 0;
2936
2937         for (i = 0; ; i++) {
2938                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2939                 if (!aalg)
2940                         break;
2941                 if (!aalg->pfkey_supported)
2942                         continue;
2943                 if (aalg_tmpl_set(t, aalg))
2944                         sz += sizeof(struct sadb_comb);
2945         }
2946         return sz + sizeof(struct sadb_prop);
2947 }
2948
2949 static int count_esp_combs(const struct xfrm_tmpl *t)
2950 {
2951         int i, k, sz = 0;
2952
2953         for (i = 0; ; i++) {
2954                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2955                 if (!ealg)
2956                         break;
2957
2958                 if (!ealg->pfkey_supported)
2959                         continue;
2960
2961                 if (!(ealg_tmpl_set(t, ealg)))
2962                         continue;
2963
2964                 for (k = 1; ; k++) {
2965                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2966                         if (!aalg)
2967                                 break;
2968
2969                         if (!aalg->pfkey_supported)
2970                                 continue;
2971
2972                         if (aalg_tmpl_set(t, aalg))
2973                                 sz += sizeof(struct sadb_comb);
2974                 }
2975         }
2976         return sz + sizeof(struct sadb_prop);
2977 }
2978
2979 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2980 {
2981         struct sadb_prop *p;
2982         int sz = 0;
2983         int i;
2984
2985         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2986         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2987         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2988         p->sadb_prop_replay = 32;
2989         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2990
2991         for (i = 0; ; i++) {
2992                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2993                 if (!aalg)
2994                         break;
2995
2996                 if (!aalg->pfkey_supported)
2997                         continue;
2998
2999                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
3000                         struct sadb_comb *c;
3001                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
3002                         memset(c, 0, sizeof(*c));
3003                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3004                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3005                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3006                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3007                         c->sadb_comb_hard_addtime = 24*60*60;
3008                         c->sadb_comb_soft_addtime = 20*60*60;
3009                         c->sadb_comb_hard_usetime = 8*60*60;
3010                         c->sadb_comb_soft_usetime = 7*60*60;
3011                         sz += sizeof(*c);
3012                 }
3013         }
3014
3015         return sz + sizeof(*p);
3016 }
3017
3018 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
3019 {
3020         struct sadb_prop *p;
3021         int sz = 0;
3022         int i, k;
3023
3024         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
3025         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
3026         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
3027         p->sadb_prop_replay = 32;
3028         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
3029
3030         for (i=0; ; i++) {
3031                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
3032                 if (!ealg)
3033                         break;
3034
3035                 if (!ealg->pfkey_supported)
3036                         continue;
3037
3038                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
3039                         continue;
3040
3041                 for (k = 1; ; k++) {
3042                         struct sadb_comb *c;
3043                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
3044                         if (!aalg)
3045                                 break;
3046                         if (!aalg->pfkey_supported)
3047                                 continue;
3048                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
3049                                 continue;
3050                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
3051                         memset(c, 0, sizeof(*c));
3052                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
3053                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
3054                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
3055                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
3056                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
3057                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
3058                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
3059                         c->sadb_comb_hard_addtime = 24*60*60;
3060                         c->sadb_comb_soft_addtime = 20*60*60;
3061                         c->sadb_comb_hard_usetime = 8*60*60;
3062                         c->sadb_comb_soft_usetime = 7*60*60;
3063                         sz += sizeof(*c);
3064                 }
3065         }
3066
3067         return sz + sizeof(*p);
3068 }
3069
3070 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
3071 {
3072         return 0;
3073 }
3074
3075 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
3076 {
3077         struct sk_buff *out_skb;
3078         struct sadb_msg *out_hdr;
3079         int hard;
3080         int hsc;
3081
3082         hard = c->data.hard;
3083         if (hard)
3084                 hsc = 2;
3085         else
3086                 hsc = 1;
3087
3088         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3089         if (IS_ERR(out_skb))
3090                 return PTR_ERR(out_skb);
3091
3092         out_hdr = (struct sadb_msg *) out_skb->data;
3093         out_hdr->sadb_msg_version = PF_KEY_V2;
3094         out_hdr->sadb_msg_type = SADB_EXPIRE;
3095         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3096         out_hdr->sadb_msg_errno = 0;
3097         out_hdr->sadb_msg_reserved = 0;
3098         out_hdr->sadb_msg_seq = 0;
3099         out_hdr->sadb_msg_pid = 0;
3100
3101         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3102                         xs_net(x));
3103         return 0;
3104 }
3105
3106 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3107 {
3108         struct net *net = x ? xs_net(x) : c->net;
3109         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3110
3111         if (atomic_read(&net_pfkey->socks_nr) == 0)
3112                 return 0;
3113
3114         switch (c->event) {
3115         case XFRM_MSG_EXPIRE:
3116                 return key_notify_sa_expire(x, c);
3117         case XFRM_MSG_DELSA:
3118         case XFRM_MSG_NEWSA:
3119         case XFRM_MSG_UPDSA:
3120                 return key_notify_sa(x, c);
3121         case XFRM_MSG_FLUSHSA:
3122                 return key_notify_sa_flush(c);
3123         case XFRM_MSG_NEWAE: /* not yet supported */
3124                 break;
3125         default:
3126                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3127                 break;
3128         }
3129
3130         return 0;
3131 }
3132
3133 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3134 {
3135         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3136                 return 0;
3137
3138         switch (c->event) {
3139         case XFRM_MSG_POLEXPIRE:
3140                 return key_notify_policy_expire(xp, c);
3141         case XFRM_MSG_DELPOLICY:
3142         case XFRM_MSG_NEWPOLICY:
3143         case XFRM_MSG_UPDPOLICY:
3144                 return key_notify_policy(xp, dir, c);
3145         case XFRM_MSG_FLUSHPOLICY:
3146                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3147                         break;
3148                 return key_notify_policy_flush(c);
3149         default:
3150                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3151                 break;
3152         }
3153
3154         return 0;
3155 }
3156
3157 static u32 get_acqseq(void)
3158 {
3159         u32 res;
3160         static atomic_t acqseq;
3161
3162         do {
3163                 res = atomic_inc_return(&acqseq);
3164         } while (!res);
3165         return res;
3166 }
3167
3168 static bool pfkey_is_alive(const struct km_event *c)
3169 {
3170         struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
3171         struct sock *sk;
3172         bool is_alive = false;
3173
3174         rcu_read_lock();
3175         sk_for_each_rcu(sk, &net_pfkey->table) {
3176                 if (pfkey_sk(sk)->registered) {
3177                         is_alive = true;
3178                         break;
3179                 }
3180         }
3181         rcu_read_unlock();
3182
3183         return is_alive;
3184 }
3185
3186 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3187 {
3188         struct sk_buff *skb;
3189         struct sadb_msg *hdr;
3190         struct sadb_address *addr;
3191         struct sadb_x_policy *pol;
3192         int sockaddr_size;
3193         int size;
3194         struct sadb_x_sec_ctx *sec_ctx;
3195         struct xfrm_sec_ctx *xfrm_ctx;
3196         int ctx_size = 0;
3197         int alg_size = 0;
3198
3199         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3200         if (!sockaddr_size)
3201                 return -EINVAL;
3202
3203         size = sizeof(struct sadb_msg) +
3204                 (sizeof(struct sadb_address) * 2) +
3205                 (sockaddr_size * 2) +
3206                 sizeof(struct sadb_x_policy);
3207
3208         if (x->id.proto == IPPROTO_AH)
3209                 alg_size = count_ah_combs(t);
3210         else if (x->id.proto == IPPROTO_ESP)
3211                 alg_size = count_esp_combs(t);
3212
3213         if ((xfrm_ctx = x->security)) {
3214                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3215                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3216         }
3217
3218         skb =  alloc_skb(size + alg_size + 16, GFP_ATOMIC);
3219         if (skb == NULL)
3220                 return -ENOMEM;
3221
3222         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3223         hdr->sadb_msg_version = PF_KEY_V2;
3224         hdr->sadb_msg_type = SADB_ACQUIRE;
3225         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3226         hdr->sadb_msg_len = size / sizeof(uint64_t);
3227         hdr->sadb_msg_errno = 0;
3228         hdr->sadb_msg_reserved = 0;
3229         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3230         hdr->sadb_msg_pid = 0;
3231
3232         /* src address */
3233         addr = (struct sadb_address*) skb_put(skb,
3234                                               sizeof(struct sadb_address)+sockaddr_size);
3235         addr->sadb_address_len =
3236                 (sizeof(struct sadb_address)+sockaddr_size)/
3237                         sizeof(uint64_t);
3238         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3239         addr->sadb_address_proto = 0;
3240         addr->sadb_address_reserved = 0;
3241         addr->sadb_address_prefixlen =
3242                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3243                                     (struct sockaddr *) (addr + 1),
3244                                     x->props.family);
3245         if (!addr->sadb_address_prefixlen)
3246                 BUG();
3247
3248         /* dst address */
3249         addr = (struct sadb_address*) skb_put(skb,
3250                                               sizeof(struct sadb_address)+sockaddr_size);
3251         addr->sadb_address_len =
3252                 (sizeof(struct sadb_address)+sockaddr_size)/
3253                         sizeof(uint64_t);
3254         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3255         addr->sadb_address_proto = 0;
3256         addr->sadb_address_reserved = 0;
3257         addr->sadb_address_prefixlen =
3258                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3259                                     (struct sockaddr *) (addr + 1),
3260                                     x->props.family);
3261         if (!addr->sadb_address_prefixlen)
3262                 BUG();
3263
3264         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3265         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3266         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3267         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3268         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3269         pol->sadb_x_policy_reserved = 0;
3270         pol->sadb_x_policy_id = xp->index;
3271         pol->sadb_x_policy_priority = xp->priority;
3272
3273         /* Set sadb_comb's. */
3274         alg_size = 0;
3275         if (x->id.proto == IPPROTO_AH)
3276                 alg_size = dump_ah_combs(skb, t);
3277         else if (x->id.proto == IPPROTO_ESP)
3278                 alg_size = dump_esp_combs(skb, t);
3279
3280         hdr->sadb_msg_len += alg_size / 8;
3281
3282         /* security context */
3283         if (xfrm_ctx) {
3284                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3285                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3286                 sec_ctx->sadb_x_sec_len =
3287                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3288                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3289                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3290                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3291                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3292                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3293                        xfrm_ctx->ctx_len);
3294         }
3295
3296         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3297                                xs_net(x));
3298 }
3299
3300 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3301                                                 u8 *data, int len, int *dir)
3302 {
3303         struct net *net = sock_net(sk);
3304         struct xfrm_policy *xp;
3305         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3306         struct sadb_x_sec_ctx *sec_ctx;
3307
3308         switch (sk->sk_family) {
3309         case AF_INET:
3310                 if (opt != IP_IPSEC_POLICY) {
3311                         *dir = -EOPNOTSUPP;
3312                         return NULL;
3313                 }
3314                 break;
3315 #if IS_ENABLED(CONFIG_IPV6)
3316         case AF_INET6:
3317                 if (opt != IPV6_IPSEC_POLICY) {
3318                         *dir = -EOPNOTSUPP;
3319                         return NULL;
3320                 }
3321                 break;
3322 #endif
3323         default:
3324                 *dir = -EINVAL;
3325                 return NULL;
3326         }
3327
3328         *dir = -EINVAL;
3329
3330         if (len < sizeof(struct sadb_x_policy) ||
3331             pol->sadb_x_policy_len*8 > len ||
3332             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3333             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3334                 return NULL;
3335
3336         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3337         if (xp == NULL) {
3338                 *dir = -ENOBUFS;
3339                 return NULL;
3340         }
3341
3342         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3343                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3344
3345         xp->lft.soft_byte_limit = XFRM_INF;
3346         xp->lft.hard_byte_limit = XFRM_INF;
3347         xp->lft.soft_packet_limit = XFRM_INF;
3348         xp->lft.hard_packet_limit = XFRM_INF;
3349         xp->family = sk->sk_family;
3350
3351         xp->xfrm_nr = 0;
3352         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3353             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3354                 goto out;
3355
3356         /* security context too */
3357         if (len >= (pol->sadb_x_policy_len*8 +
3358             sizeof(struct sadb_x_sec_ctx))) {
3359                 char *p = (char *)pol;
3360                 struct xfrm_user_sec_ctx *uctx;
3361
3362                 p += pol->sadb_x_policy_len*8;
3363                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3364                 if (len < pol->sadb_x_policy_len*8 +
3365                     sec_ctx->sadb_x_sec_len*8) {
3366                         *dir = -EINVAL;
3367                         goto out;
3368                 }
3369                 if ((*dir = verify_sec_ctx_len(p)))
3370                         goto out;
3371                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC);
3372                 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC);
3373                 kfree(uctx);
3374
3375                 if (*dir)
3376                         goto out;
3377         }
3378
3379         *dir = pol->sadb_x_policy_dir-1;
3380         return xp;
3381
3382 out:
3383         xp->walk.dead = 1;
3384         xfrm_policy_destroy(xp);
3385         return NULL;
3386 }
3387
3388 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3389 {
3390         struct sk_buff *skb;
3391         struct sadb_msg *hdr;
3392         struct sadb_sa *sa;
3393         struct sadb_address *addr;
3394         struct sadb_x_nat_t_port *n_port;
3395         int sockaddr_size;
3396         int size;
3397         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3398         struct xfrm_encap_tmpl *natt = NULL;
3399
3400         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3401         if (!sockaddr_size)
3402                 return -EINVAL;
3403
3404         if (!satype)
3405                 return -EINVAL;
3406
3407         if (!x->encap)
3408                 return -EINVAL;
3409
3410         natt = x->encap;
3411
3412         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3413          *
3414          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3415          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3416          */
3417
3418         size = sizeof(struct sadb_msg) +
3419                 sizeof(struct sadb_sa) +
3420                 (sizeof(struct sadb_address) * 2) +
3421                 (sockaddr_size * 2) +
3422                 (sizeof(struct sadb_x_nat_t_port) * 2);
3423
3424         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3425         if (skb == NULL)
3426                 return -ENOMEM;
3427
3428         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3429         hdr->sadb_msg_version = PF_KEY_V2;
3430         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3431         hdr->sadb_msg_satype = satype;
3432         hdr->sadb_msg_len = size / sizeof(uint64_t);
3433         hdr->sadb_msg_errno = 0;
3434         hdr->sadb_msg_reserved = 0;
3435         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3436         hdr->sadb_msg_pid = 0;
3437
3438         /* SA */
3439         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3440         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3441         sa->sadb_sa_exttype = SADB_EXT_SA;
3442         sa->sadb_sa_spi = x->id.spi;
3443         sa->sadb_sa_replay = 0;
3444         sa->sadb_sa_state = 0;
3445         sa->sadb_sa_auth = 0;
3446         sa->sadb_sa_encrypt = 0;
3447         sa->sadb_sa_flags = 0;
3448
3449         /* ADDRESS_SRC (old addr) */
3450         addr = (struct sadb_address*)
3451                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3452         addr->sadb_address_len =
3453                 (sizeof(struct sadb_address)+sockaddr_size)/
3454                         sizeof(uint64_t);
3455         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3456         addr->sadb_address_proto = 0;
3457         addr->sadb_address_reserved = 0;
3458         addr->sadb_address_prefixlen =
3459                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3460                                     (struct sockaddr *) (addr + 1),
3461                                     x->props.family);
3462         if (!addr->sadb_address_prefixlen)
3463                 BUG();
3464
3465         /* NAT_T_SPORT (old port) */
3466         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3467         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3468         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3469         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3470         n_port->sadb_x_nat_t_port_reserved = 0;
3471
3472         /* ADDRESS_DST (new addr) */
3473         addr = (struct sadb_address*)
3474                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3475         addr->sadb_address_len =
3476                 (sizeof(struct sadb_address)+sockaddr_size)/
3477                         sizeof(uint64_t);
3478         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3479         addr->sadb_address_proto = 0;
3480         addr->sadb_address_reserved = 0;
3481         addr->sadb_address_prefixlen =
3482                 pfkey_sockaddr_fill(ipaddr, 0,
3483                                     (struct sockaddr *) (addr + 1),
3484                                     x->props.family);
3485         if (!addr->sadb_address_prefixlen)
3486                 BUG();
3487
3488         /* NAT_T_DPORT (new port) */
3489         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3490         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3491         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3492         n_port->sadb_x_nat_t_port_port = sport;
3493         n_port->sadb_x_nat_t_port_reserved = 0;
3494
3495         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3496                                xs_net(x));
3497 }
3498
3499 #ifdef CONFIG_NET_KEY_MIGRATE
3500 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3501                             const struct xfrm_selector *sel)
3502 {
3503         struct sadb_address *addr;
3504         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3505         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3506         addr->sadb_address_exttype = type;
3507         addr->sadb_address_proto = sel->proto;
3508         addr->sadb_address_reserved = 0;
3509
3510         switch (type) {
3511         case SADB_EXT_ADDRESS_SRC:
3512                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3513                 pfkey_sockaddr_fill(&sel->saddr, 0,
3514                                     (struct sockaddr *)(addr + 1),
3515                                     sel->family);
3516                 break;
3517         case SADB_EXT_ADDRESS_DST:
3518                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3519                 pfkey_sockaddr_fill(&sel->daddr, 0,
3520                                     (struct sockaddr *)(addr + 1),
3521                                     sel->family);
3522                 break;
3523         default:
3524                 return -EINVAL;
3525         }
3526
3527         return 0;
3528 }
3529
3530
3531 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3532 {
3533         struct sadb_x_kmaddress *kma;
3534         u8 *sa;
3535         int family = k->family;
3536         int socklen = pfkey_sockaddr_len(family);
3537         int size_req;
3538
3539         size_req = (sizeof(struct sadb_x_kmaddress) +
3540                     pfkey_sockaddr_pair_size(family));
3541
3542         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3543         memset(kma, 0, size_req);
3544         kma->sadb_x_kmaddress_len = size_req / 8;
3545         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3546         kma->sadb_x_kmaddress_reserved = k->reserved;
3547
3548         sa = (u8 *)(kma + 1);
3549         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3550             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3551                 return -EINVAL;
3552
3553         return 0;
3554 }
3555
3556 static int set_ipsecrequest(struct sk_buff *skb,
3557                             uint8_t proto, uint8_t mode, int level,
3558                             uint32_t reqid, uint8_t family,
3559                             const xfrm_address_t *src, const xfrm_address_t *dst)
3560 {
3561         struct sadb_x_ipsecrequest *rq;
3562         u8 *sa;
3563         int socklen = pfkey_sockaddr_len(family);
3564         int size_req;
3565
3566         size_req = sizeof(struct sadb_x_ipsecrequest) +
3567                    pfkey_sockaddr_pair_size(family);
3568
3569         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3570         memset(rq, 0, size_req);
3571         rq->sadb_x_ipsecrequest_len = size_req;
3572         rq->sadb_x_ipsecrequest_proto = proto;
3573         rq->sadb_x_ipsecrequest_mode = mode;
3574         rq->sadb_x_ipsecrequest_level = level;
3575         rq->sadb_x_ipsecrequest_reqid = reqid;
3576
3577         sa = (u8 *) (rq + 1);
3578         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3579             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3580                 return -EINVAL;
3581
3582         return 0;
3583 }
3584 #endif
3585
3586 #ifdef CONFIG_NET_KEY_MIGRATE
3587 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3588                               const struct xfrm_migrate *m, int num_bundles,
3589                               const struct xfrm_kmaddress *k)
3590 {
3591         int i;
3592         int sasize_sel;
3593         int size = 0;
3594         int size_pol = 0;
3595         struct sk_buff *skb;
3596         struct sadb_msg *hdr;
3597         struct sadb_x_policy *pol;
3598         const struct xfrm_migrate *mp;
3599
3600         if (type != XFRM_POLICY_TYPE_MAIN)
3601                 return 0;
3602
3603         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3604                 return -EINVAL;
3605
3606         if (k != NULL) {
3607                 /* addresses for KM */
3608                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3609                                      pfkey_sockaddr_pair_size(k->family));
3610         }
3611
3612         /* selector */
3613         sasize_sel = pfkey_sockaddr_size(sel->family);
3614         if (!sasize_sel)
3615                 return -EINVAL;
3616         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3617
3618         /* policy info */
3619         size_pol += sizeof(struct sadb_x_policy);
3620
3621         /* ipsecrequests */
3622         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3623                 /* old locator pair */
3624                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3625                             pfkey_sockaddr_pair_size(mp->old_family);
3626                 /* new locator pair */
3627                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3628                             pfkey_sockaddr_pair_size(mp->new_family);
3629         }
3630
3631         size += sizeof(struct sadb_msg) + size_pol;
3632
3633         /* alloc buffer */
3634         skb = alloc_skb(size, GFP_ATOMIC);
3635         if (skb == NULL)
3636                 return -ENOMEM;
3637
3638         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3639         hdr->sadb_msg_version = PF_KEY_V2;
3640         hdr->sadb_msg_type = SADB_X_MIGRATE;
3641         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3642         hdr->sadb_msg_len = size / 8;
3643         hdr->sadb_msg_errno = 0;
3644         hdr->sadb_msg_reserved = 0;
3645         hdr->sadb_msg_seq = 0;
3646         hdr->sadb_msg_pid = 0;
3647
3648         /* Addresses to be used by KM for negotiation, if ext is available */
3649         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3650                 goto err;
3651
3652         /* selector src */
3653         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3654
3655         /* selector dst */
3656         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3657
3658         /* policy information */
3659         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3660         pol->sadb_x_policy_len = size_pol / 8;
3661         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3662         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3663         pol->sadb_x_policy_dir = dir + 1;
3664         pol->sadb_x_policy_reserved = 0;
3665         pol->sadb_x_policy_id = 0;
3666         pol->sadb_x_policy_priority = 0;
3667
3668         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3669                 /* old ipsecrequest */
3670                 int mode = pfkey_mode_from_xfrm(mp->mode);
3671                 if (mode < 0)
3672                         goto err;
3673                 if (set_ipsecrequest(skb, mp->proto, mode,
3674                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3675                                      mp->reqid, mp->old_family,
3676                                      &mp->old_saddr, &mp->old_daddr) < 0)
3677                         goto err;
3678
3679                 /* new ipsecrequest */
3680                 if (set_ipsecrequest(skb, mp->proto, mode,
3681                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3682                                      mp->reqid, mp->new_family,
3683                                      &mp->new_saddr, &mp->new_daddr) < 0)
3684                         goto err;
3685         }
3686
3687         /* broadcast migrate message to sockets */
3688         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3689
3690         return 0;
3691
3692 err:
3693         kfree_skb(skb);
3694         return -EINVAL;
3695 }
3696 #else
3697 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3698                               const struct xfrm_migrate *m, int num_bundles,
3699                               const struct xfrm_kmaddress *k)
3700 {
3701         return -ENOPROTOOPT;
3702 }
3703 #endif
3704
3705 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
3706 {
3707         struct sock *sk = sock->sk;
3708         struct sk_buff *skb = NULL;
3709         struct sadb_msg *hdr = NULL;
3710         int err;
3711         struct net *net = sock_net(sk);
3712
3713         err = -EOPNOTSUPP;
3714         if (msg->msg_flags & MSG_OOB)
3715                 goto out;
3716
3717         err = -EMSGSIZE;
3718         if ((unsigned int)len > sk->sk_sndbuf - 32)
3719                 goto out;
3720
3721         err = -ENOBUFS;
3722         skb = alloc_skb(len, GFP_KERNEL);
3723         if (skb == NULL)
3724                 goto out;
3725
3726         err = -EFAULT;
3727         if (memcpy_from_msg(skb_put(skb,len), msg, len))
3728                 goto out;
3729
3730         hdr = pfkey_get_base_msg(skb, &err);
3731         if (!hdr)
3732                 goto out;
3733
3734         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3735         err = pfkey_process(sk, skb, hdr);
3736         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3737
3738 out:
3739         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3740                 err = 0;
3741         kfree_skb(skb);
3742
3743         return err ? : len;
3744 }
3745
3746 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
3747                          int flags)
3748 {
3749         struct sock *sk = sock->sk;
3750         struct pfkey_sock *pfk = pfkey_sk(sk);
3751         struct sk_buff *skb;
3752         int copied, err;
3753
3754         err = -EINVAL;
3755         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3756                 goto out;
3757
3758         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3759         if (skb == NULL)
3760                 goto out;
3761
3762         copied = skb->len;
3763         if (copied > len) {
3764                 msg->msg_flags |= MSG_TRUNC;
3765                 copied = len;
3766         }
3767
3768         skb_reset_transport_header(skb);
3769         err = skb_copy_datagram_msg(skb, 0, msg, copied);
3770         if (err)
3771                 goto out_free;
3772
3773         sock_recv_ts_and_drops(msg, sk, skb);
3774
3775         err = (flags & MSG_TRUNC) ? skb->len : copied;
3776
3777         if (pfk->dump.dump != NULL &&
3778             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3779                 pfkey_do_dump(pfk);
3780
3781 out_free:
3782         skb_free_datagram(sk, skb);
3783 out:
3784         return err;
3785 }
3786
3787 static const struct proto_ops pfkey_ops = {
3788         .family         =       PF_KEY,
3789         .owner          =       THIS_MODULE,
3790         /* Operations that make no sense on pfkey sockets. */
3791         .bind           =       sock_no_bind,
3792         .connect        =       sock_no_connect,
3793         .socketpair     =       sock_no_socketpair,
3794         .accept         =       sock_no_accept,
3795         .getname        =       sock_no_getname,
3796         .ioctl          =       sock_no_ioctl,
3797         .listen         =       sock_no_listen,
3798         .shutdown       =       sock_no_shutdown,
3799         .setsockopt     =       sock_no_setsockopt,
3800         .getsockopt     =       sock_no_getsockopt,
3801         .mmap           =       sock_no_mmap,
3802         .sendpage       =       sock_no_sendpage,
3803
3804         /* Now the operations that really occur. */
3805         .release        =       pfkey_release,
3806         .poll           =       datagram_poll,
3807         .sendmsg        =       pfkey_sendmsg,
3808         .recvmsg        =       pfkey_recvmsg,
3809 };
3810
3811 static const struct net_proto_family pfkey_family_ops = {
3812         .family =       PF_KEY,
3813         .create =       pfkey_create,
3814         .owner  =       THIS_MODULE,
3815 };
3816
3817 #ifdef CONFIG_PROC_FS
3818 static int pfkey_seq_show(struct seq_file *f, void *v)
3819 {
3820         struct sock *s = sk_entry(v);
3821
3822         if (v == SEQ_START_TOKEN)
3823                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3824         else
3825                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3826                                s,
3827                                atomic_read(&s->sk_refcnt),
3828                                sk_rmem_alloc_get(s),
3829                                sk_wmem_alloc_get(s),
3830                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3831                                sock_i_ino(s)
3832                                );
3833         return 0;
3834 }
3835
3836 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3837         __acquires(rcu)
3838 {
3839         struct net *net = seq_file_net(f);
3840         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3841
3842         rcu_read_lock();
3843         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3844 }
3845
3846 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3847 {
3848         struct net *net = seq_file_net(f);
3849         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3850
3851         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3852 }
3853
3854 static void pfkey_seq_stop(struct seq_file *f, void *v)
3855         __releases(rcu)
3856 {
3857         rcu_read_unlock();
3858 }
3859
3860 static const struct seq_operations pfkey_seq_ops = {
3861         .start  = pfkey_seq_start,
3862         .next   = pfkey_seq_next,
3863         .stop   = pfkey_seq_stop,
3864         .show   = pfkey_seq_show,
3865 };
3866
3867 static int pfkey_seq_open(struct inode *inode, struct file *file)
3868 {
3869         return seq_open_net(inode, file, &pfkey_seq_ops,
3870                             sizeof(struct seq_net_private));
3871 }
3872
3873 static const struct file_operations pfkey_proc_ops = {
3874         .open    = pfkey_seq_open,
3875         .read    = seq_read,
3876         .llseek  = seq_lseek,
3877         .release = seq_release_net,
3878 };
3879
3880 static int __net_init pfkey_init_proc(struct net *net)
3881 {
3882         struct proc_dir_entry *e;
3883
3884         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3885         if (e == NULL)
3886                 return -ENOMEM;
3887
3888         return 0;
3889 }
3890
3891 static void __net_exit pfkey_exit_proc(struct net *net)
3892 {
3893         remove_proc_entry("pfkey", net->proc_net);
3894 }
3895 #else
3896 static inline int pfkey_init_proc(struct net *net)
3897 {
3898         return 0;
3899 }
3900
3901 static inline void pfkey_exit_proc(struct net *net)
3902 {
3903 }
3904 #endif
3905
3906 static struct xfrm_mgr pfkeyv2_mgr =
3907 {
3908         .id             = "pfkeyv2",
3909         .notify         = pfkey_send_notify,
3910         .acquire        = pfkey_send_acquire,
3911         .compile_policy = pfkey_compile_policy,
3912         .new_mapping    = pfkey_send_new_mapping,
3913         .notify_policy  = pfkey_send_policy_notify,
3914         .migrate        = pfkey_send_migrate,
3915         .is_alive       = pfkey_is_alive,
3916 };
3917
3918 static int __net_init pfkey_net_init(struct net *net)
3919 {
3920         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3921         int rv;
3922
3923         INIT_HLIST_HEAD(&net_pfkey->table);
3924         atomic_set(&net_pfkey->socks_nr, 0);
3925
3926         rv = pfkey_init_proc(net);
3927
3928         return rv;
3929 }
3930
3931 static void __net_exit pfkey_net_exit(struct net *net)
3932 {
3933         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3934
3935         pfkey_exit_proc(net);
3936         BUG_ON(!hlist_empty(&net_pfkey->table));
3937 }
3938
3939 static struct pernet_operations pfkey_net_ops = {
3940         .init = pfkey_net_init,
3941         .exit = pfkey_net_exit,
3942         .id   = &pfkey_net_id,
3943         .size = sizeof(struct netns_pfkey),
3944 };
3945
3946 static void __exit ipsec_pfkey_exit(void)
3947 {
3948         xfrm_unregister_km(&pfkeyv2_mgr);
3949         sock_unregister(PF_KEY);
3950         unregister_pernet_subsys(&pfkey_net_ops);
3951         proto_unregister(&key_proto);
3952 }
3953
3954 static int __init ipsec_pfkey_init(void)
3955 {
3956         int err = proto_register(&key_proto, 0);
3957
3958         if (err != 0)
3959                 goto out;
3960
3961         err = register_pernet_subsys(&pfkey_net_ops);
3962         if (err != 0)
3963                 goto out_unregister_key_proto;
3964         err = sock_register(&pfkey_family_ops);
3965         if (err != 0)
3966                 goto out_unregister_pernet;
3967         err = xfrm_register_km(&pfkeyv2_mgr);
3968         if (err != 0)
3969                 goto out_sock_unregister;
3970 out:
3971         return err;
3972
3973 out_sock_unregister:
3974         sock_unregister(PF_KEY);
3975 out_unregister_pernet:
3976         unregister_pernet_subsys(&pfkey_net_ops);
3977 out_unregister_key_proto:
3978         proto_unregister(&key_proto);
3979         goto out;
3980 }
3981
3982 module_init(ipsec_pfkey_init);
3983 module_exit(ipsec_pfkey_exit);
3984 MODULE_LICENSE("GPL");
3985 MODULE_ALIAS_NETPROTO(PF_KEY);