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   <[email protected]>
  10  *              David S. Miller <[email protected]>
  11  *              Alexey Kuznetsov <[email protected]>
  12  *              Kunihiro Ishiguro <[email protected]>
  13  *              Kazunori MIYAZAWA / USAGI Project <[email protected]>
  14  *              Derek Atkins <[email protected]>
  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 };
  67
  68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  69 {
  70         return (struct pfkey_sock *)sk;
  71 }
  72
  73 static int pfkey_can_dump(const struct sock *sk)
  74 {
  75         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  76                 return 1;
  77         return 0;
  78 }
  79
  80 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  81 {
  82         if (pfk->dump.dump) {
  83                 if (pfk->dump.skb) {
  84                         kfree_skb(pfk->dump.skb);
  85                         pfk->dump.skb = NULL;
  86                 }
  87                 pfk->dump.done(pfk);
  88                 pfk->dump.dump = NULL;
  89                 pfk->dump.done = NULL;
  90         }
  91 }
  92
  93 static void pfkey_sock_destruct(struct sock *sk)
  94 {
  95         struct net *net = sock_net(sk);
  96         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  97
  98         pfkey_terminate_dump(pfkey_sk(sk));
  99         skb_queue_purge(&sk->sk_receive_queue);
 100
 101         if (!sock_flag(sk, SOCK_DEAD)) {
 102                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 103                 return;
 104         }
 105
 106         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 107         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 108
 109         atomic_dec(&net_pfkey->socks_nr);
 110 }
 111
 112 static const struct proto_ops pfkey_ops;
 113
 114 static void pfkey_insert(struct sock *sk)
 115 {
 116         struct net *net = sock_net(sk);
 117         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 118
 119         mutex_lock(&pfkey_mutex);
 120         sk_add_node_rcu(sk, &net_pfkey->table);
 121         mutex_unlock(&pfkey_mutex);
 122 }
 123
 124 static void pfkey_remove(struct sock *sk)
 125 {
 126         mutex_lock(&pfkey_mutex);
 127         sk_del_node_init_rcu(sk);
 128         mutex_unlock(&pfkey_mutex);
 129 }
 130
 131 static struct proto key_proto = {
 132         .name     = "KEY",
 133         .owner    = THIS_MODULE,
 134         .obj_size = sizeof(struct pfkey_sock),
 135 };
 136
 137 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 138                         int kern)
 139 {
 140         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 141         struct sock *sk;
 142         int err;
 143
 144         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 145                 return -EPERM;
 146         if (sock->type != SOCK_RAW)
 147                 return -ESOCKTNOSUPPORT;
 148         if (protocol != PF_KEY_V2)
 149                 return -EPROTONOSUPPORT;
 150
 151         err = -ENOMEM;
 152         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 153         if (sk == NULL)
 154                 goto out;
 155
 156         sock->ops = &pfkey_ops;
 157         sock_init_data(sock, sk);
 158
 159         sk->sk_family = PF_KEY;
 160         sk->sk_destruct = pfkey_sock_destruct;
 161
 162         atomic_inc(&net_pfkey->socks_nr);
 163
 164         pfkey_insert(sk);
 165
 166         return 0;
 167 out:
 168         return err;
 169 }
 170
 171 static int pfkey_release(struct socket *sock)
 172 {
 173         struct sock *sk = sock->sk;
 174
 175         if (!sk)
 176                 return 0;
 177
 178         pfkey_remove(sk);
 179
 180         sock_orphan(sk);
 181         sock->sk = NULL;
 182         skb_queue_purge(&sk->sk_write_queue);
 183
 184         synchronize_rcu();
 185         sock_put(sk);
 186
 187         return 0;
 188 }
 189
 190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 191                                gfp_t allocation, struct sock *sk)
 192 {
 193         int err = -ENOBUFS;
 194
 195         sock_hold(sk);
 196         if (*skb2 == NULL) {
 197                 if (atomic_read(&skb->users) != 1) {
 198                         *skb2 = skb_clone(skb, allocation);
 199                 } else {
 200                         *skb2 = skb;
 201                         atomic_inc(&skb->users);
 202                 }
 203         }
 204         if (*skb2 != NULL) {
 205                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 206                         skb_set_owner_r(*skb2, sk);
 207                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 208                         sk->sk_data_ready(sk, (*skb2)->len);
 209                         *skb2 = NULL;
 210                         err = 0;
 211                 }
 212         }
 213         sock_put(sk);
 214         return err;
 215 }
 216
 217 /* Send SKB to all pfkey sockets matching selected criteria.  */
 218 #define BROADCAST_ALL           0
 219 #define BROADCAST_ONE           1
 220 #define BROADCAST_REGISTERED    2
 221 #define BROADCAST_PROMISC_ONLY  4
 222 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 223                            int broadcast_flags, struct sock *one_sk,
 224                            struct net *net)
 225 {
 226         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 227         struct sock *sk;
 228         struct sk_buff *skb2 = NULL;
 229         int err = -ESRCH;
 230
 231         /* XXX Do we need something like netlink_overrun?  I think
 232          * XXX PF_KEY socket apps will not mind current behavior.
 233          */
 234         if (!skb)
 235                 return -ENOMEM;
 236
 237         rcu_read_lock();
 238         sk_for_each_rcu(sk, &net_pfkey->table) {
 239                 struct pfkey_sock *pfk = pfkey_sk(sk);
 240                 int err2;
 241
 242                 /* Yes, it means that if you are meant to receive this
 243                  * pfkey message you receive it twice as promiscuous
 244                  * socket.
 245                  */
 246                 if (pfk->promisc)
 247                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 248
 249                 /* the exact target will be processed later */
 250                 if (sk == one_sk)
 251                         continue;
 252                 if (broadcast_flags != BROADCAST_ALL) {
 253                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 254                                 continue;
 255                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 256                             !pfk->registered)
 257                                 continue;
 258                         if (broadcast_flags & BROADCAST_ONE)
 259                                 continue;
 260                 }
 261
 262                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 263
 264                 /* Error is cleare after succecful sending to at least one
 265                  * registered KM */
 266                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 267                         err = err2;
 268         }
 269         rcu_read_unlock();
 270
 271         if (one_sk != NULL)
 272                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 273
 274         kfree_skb(skb2);
 275         kfree_skb(skb);
 276         return err;
 277 }
 278
 279 static int pfkey_do_dump(struct pfkey_sock *pfk)
 280 {
 281         struct sadb_msg *hdr;
 282         int rc;
 283
 284         rc = pfk->dump.dump(pfk);
 285         if (rc == -ENOBUFS)
 286                 return 0;
 287
 288         if (pfk->dump.skb) {
 289                 if (!pfkey_can_dump(&pfk->sk))
 290                         return 0;
 291
 292                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 293                 hdr->sadb_msg_seq = 0;
 294                 hdr->sadb_msg_errno = rc;
 295                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 296                                 &pfk->sk, sock_net(&pfk->sk));
 297                 pfk->dump.skb = NULL;
 298         }
 299
 300         pfkey_terminate_dump(pfk);
 301         return rc;
 302 }
 303
 304 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 305                                  const struct sadb_msg *orig)
 306 {
 307         *new = *orig;
 308 }
 309
 310 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 311 {
 312         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 313         struct sadb_msg *hdr;
 314
 315         if (!skb)
 316                 return -ENOBUFS;
 317
 318         /* Woe be to the platform trying to support PFKEY yet
 319          * having normal errnos outside the 1-255 range, inclusive.
 320          */
 321         err = -err;
 322         if (err == ERESTARTSYS ||
 323             err == ERESTARTNOHAND ||
 324             err == ERESTARTNOINTR)
 325                 err = EINTR;
 326         if (err >= 512)
 327                 err = EINVAL;
 328         BUG_ON(err <= 0 || err >= 256);
 329
 330         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 331         pfkey_hdr_dup(hdr, orig);
 332         hdr->sadb_msg_errno = (uint8_t) err;
 333         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 334                              sizeof(uint64_t));
 335
 336         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 337
 338         return 0;
 339 }
 340
 341 static const u8 sadb_ext_min_len[] = {
 342         [SADB_EXT_RESERVED]             = (u8) 0,
 343         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 344         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 345         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 346         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 347         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 348         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 349         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 350         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 351         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 352         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 353         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 354         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 355         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 356         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 357         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 358         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 359         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 360         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 361         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 362         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 363         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 364         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 365         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 366         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 367         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 368 };
 369
 370 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 371 static int verify_address_len(const void *p)
 372 {
 373         const struct sadb_address *sp = p;
 374         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 375         const struct sockaddr_in *sin;
 376 #if IS_ENABLED(CONFIG_IPV6)
 377         const struct sockaddr_in6 *sin6;
 378 #endif
 379         int len;
 380
 381         switch (addr->sa_family) {
 382         case AF_INET:
 383                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 384                 if (sp->sadb_address_len != len ||
 385                     sp->sadb_address_prefixlen > 32)
 386                         return -EINVAL;
 387                 break;
 388 #if IS_ENABLED(CONFIG_IPV6)
 389         case AF_INET6:
 390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 391                 if (sp->sadb_address_len != len ||
 392                     sp->sadb_address_prefixlen > 128)
 393                         return -EINVAL;
 394                 break;
 395 #endif
 396         default:
 397                 /* It is user using kernel to keep track of security
 398                  * associations for another protocol, such as
 399                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 400                  * lengths.
 401                  *
 402                  * XXX Actually, association/policy database is not yet
 403                  * XXX able to cope with arbitrary sockaddr families.
 404                  * XXX When it can, remove this -EINVAL.  -DaveM
 405                  */
 406                 return -EINVAL;
 407                 break;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 414 {
 415         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 416                             sec_ctx->sadb_x_ctx_len,
 417                             sizeof(uint64_t));
 418 }
 419
 420 static inline int verify_sec_ctx_len(const void *p)
 421 {
 422         const struct sadb_x_sec_ctx *sec_ctx = p;
 423         int len = sec_ctx->sadb_x_ctx_len;
 424
 425         if (len > PAGE_SIZE)
 426                 return -EINVAL;
 427
 428         len = pfkey_sec_ctx_len(sec_ctx);
 429
 430         if (sec_ctx->sadb_x_sec_len != len)
 431                 return -EINVAL;
 432
 433         return 0;
 434 }
 435
 436 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
 437 {
 438         struct xfrm_user_sec_ctx *uctx = NULL;
 439         int ctx_size = sec_ctx->sadb_x_ctx_len;
 440
 441         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 442
 443         if (!uctx)
 444                 return NULL;
 445
 446         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 447         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 448         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 449         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 450         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 451         memcpy(uctx + 1, sec_ctx + 1,
 452                uctx->ctx_len);
 453
 454         return uctx;
 455 }
 456
 457 static int present_and_same_family(const struct sadb_address *src,
 458                                    const struct sadb_address *dst)
 459 {
 460         const struct sockaddr *s_addr, *d_addr;
 461
 462         if (!src || !dst)
 463                 return 0;
 464
 465         s_addr = (const struct sockaddr *)(src + 1);
 466         d_addr = (const struct sockaddr *)(dst + 1);
 467         if (s_addr->sa_family != d_addr->sa_family)
 468                 return 0;
 469         if (s_addr->sa_family != AF_INET
 470 #if IS_ENABLED(CONFIG_IPV6)
 471             && s_addr->sa_family != AF_INET6
 472 #endif
 473                 )
 474                 return 0;
 475
 476         return 1;
 477 }
 478
 479 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 480 {
 481         const char *p = (char *) hdr;
 482         int len = skb->len;
 483
 484         len -= sizeof(*hdr);
 485         p += sizeof(*hdr);
 486         while (len > 0) {
 487                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 488                 uint16_t ext_type;
 489                 int ext_len;
 490
 491                 ext_len  = ehdr->sadb_ext_len;
 492                 ext_len *= sizeof(uint64_t);
 493                 ext_type = ehdr->sadb_ext_type;
 494                 if (ext_len < sizeof(uint64_t) ||
 495                     ext_len > len ||
 496                     ext_type == SADB_EXT_RESERVED)
 497                         return -EINVAL;
 498
 499                 if (ext_type <= SADB_EXT_MAX) {
 500                         int min = (int) sadb_ext_min_len[ext_type];
 501                         if (ext_len < min)
 502                                 return -EINVAL;
 503                         if (ext_hdrs[ext_type-1] != NULL)
 504                                 return -EINVAL;
 505                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 506                             ext_type == SADB_EXT_ADDRESS_DST ||
 507                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 508                             ext_type == SADB_X_EXT_NAT_T_OA) {
 509                                 if (verify_address_len(p))
 510                                         return -EINVAL;
 511                         }
 512                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 513                                 if (verify_sec_ctx_len(p))
 514                                         return -EINVAL;
 515                         }
 516                         ext_hdrs[ext_type-1] = (void *) p;
 517                 }
 518                 p   += ext_len;
 519                 len -= ext_len;
 520         }
 521
 522         return 0;
 523 }
 524
 525 static uint16_t
 526 pfkey_satype2proto(uint8_t satype)
 527 {
 528         switch (satype) {
 529         case SADB_SATYPE_UNSPEC:
 530                 return IPSEC_PROTO_ANY;
 531         case SADB_SATYPE_AH:
 532                 return IPPROTO_AH;
 533         case SADB_SATYPE_ESP:
 534                 return IPPROTO_ESP;
 535         case SADB_X_SATYPE_IPCOMP:
 536                 return IPPROTO_COMP;
 537                 break;
 538         default:
 539                 return 0;
 540         }
 541         /* NOTREACHED */
 542 }
 543
 544 static uint8_t
 545 pfkey_proto2satype(uint16_t proto)
 546 {
 547         switch (proto) {
 548         case IPPROTO_AH:
 549                 return SADB_SATYPE_AH;
 550         case IPPROTO_ESP:
 551                 return SADB_SATYPE_ESP;
 552         case IPPROTO_COMP:
 553                 return SADB_X_SATYPE_IPCOMP;
 554                 break;
 555         default:
 556                 return 0;
 557         }
 558         /* NOTREACHED */
 559 }
 560
 561 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 562  * say specifically 'just raw sockets' as we encode them as 255.
 563  */
 564
 565 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 566 {
 567         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 568 }
 569
 570 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 571 {
 572         return proto ? proto : IPSEC_PROTO_ANY;
 573 }
 574
 575 static inline int pfkey_sockaddr_len(sa_family_t family)
 576 {
 577         switch (family) {
 578         case AF_INET:
 579                 return sizeof(struct sockaddr_in);
 580 #if IS_ENABLED(CONFIG_IPV6)
 581         case AF_INET6:
 582                 return sizeof(struct sockaddr_in6);
 583 #endif
 584         }
 585         return 0;
 586 }
 587
 588 static
 589 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 590 {
 591         switch (sa->sa_family) {
 592         case AF_INET:
 593                 xaddr->a4 =
 594                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 595                 return AF_INET;
 596 #if IS_ENABLED(CONFIG_IPV6)
 597         case AF_INET6:
 598                 memcpy(xaddr->a6,
 599                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 600                        sizeof(struct in6_addr));
 601                 return AF_INET6;
 602 #endif
 603         }
 604         return 0;
 605 }
 606
 607 static
 608 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 609 {
 610         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 611                                       xaddr);
 612 }
 613
 614 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 615 {
 616         const struct sadb_sa *sa;
 617         const struct sadb_address *addr;
 618         uint16_t proto;
 619         unsigned short family;
 620         xfrm_address_t *xaddr;
 621
 622         sa = ext_hdrs[SADB_EXT_SA - 1];
 623         if (sa == NULL)
 624                 return NULL;
 625
 626         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 627         if (proto == 0)
 628                 return NULL;
 629
 630         /* sadb_address_len should be checked by caller */
 631         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 632         if (addr == NULL)
 633                 return NULL;
 634
 635         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 636         switch (family) {
 637         case AF_INET:
 638                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 639                 break;
 640 #if IS_ENABLED(CONFIG_IPV6)
 641         case AF_INET6:
 642                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 643                 break;
 644 #endif
 645         default:
 646                 xaddr = NULL;
 647         }
 648
 649         if (!xaddr)
 650                 return NULL;
 651
 652         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 653 }
 654
 655 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 656
 657 static int
 658 pfkey_sockaddr_size(sa_family_t family)
 659 {
 660         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 661 }
 662
 663 static inline int pfkey_mode_from_xfrm(int mode)
 664 {
 665         switch(mode) {
 666         case XFRM_MODE_TRANSPORT:
 667                 return IPSEC_MODE_TRANSPORT;
 668         case XFRM_MODE_TUNNEL:
 669                 return IPSEC_MODE_TUNNEL;
 670         case XFRM_MODE_BEET:
 671                 return IPSEC_MODE_BEET;
 672         default:
 673                 return -1;
 674         }
 675 }
 676
 677 static inline int pfkey_mode_to_xfrm(int mode)
 678 {
 679         switch(mode) {
 680         case IPSEC_MODE_ANY:    /*XXX*/
 681         case IPSEC_MODE_TRANSPORT:
 682                 return XFRM_MODE_TRANSPORT;
 683         case IPSEC_MODE_TUNNEL:
 684                 return XFRM_MODE_TUNNEL;
 685         case IPSEC_MODE_BEET:
 686                 return XFRM_MODE_BEET;
 687         default:
 688                 return -1;
 689         }
 690 }
 691
 692 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 693                                         struct sockaddr *sa,
 694                                         unsigned short family)
 695 {
 696         switch (family) {
 697         case AF_INET:
 698             {
 699                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 700                 sin->sin_family = AF_INET;
 701                 sin->sin_port = port;
 702                 sin->sin_addr.s_addr = xaddr->a4;
 703                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 704                 return 32;
 705             }
 706 #if IS_ENABLED(CONFIG_IPV6)
 707         case AF_INET6:
 708             {
 709                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 710                 sin6->sin6_family = AF_INET6;
 711                 sin6->sin6_port = port;
 712                 sin6->sin6_flowinfo = 0;
 713                 sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
 714                 sin6->sin6_scope_id = 0;
 715                 return 128;
 716             }
 717 #endif
 718         }
 719         return 0;
 720 }
 721
 722 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 723                                               int add_keys, int hsc)
 724 {
 725         struct sk_buff *skb;
 726         struct sadb_msg *hdr;
 727         struct sadb_sa *sa;
 728         struct sadb_lifetime *lifetime;
 729         struct sadb_address *addr;
 730         struct sadb_key *key;
 731         struct sadb_x_sa2 *sa2;
 732         struct sadb_x_sec_ctx *sec_ctx;
 733         struct xfrm_sec_ctx *xfrm_ctx;
 734         int ctx_size = 0;
 735         int size;
 736         int auth_key_size = 0;
 737         int encrypt_key_size = 0;
 738         int sockaddr_size;
 739         struct xfrm_encap_tmpl *natt = NULL;
 740         int mode;
 741
 742         /* address family check */
 743         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 744         if (!sockaddr_size)
 745                 return ERR_PTR(-EINVAL);
 746
 747         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 748            key(AE), (identity(SD),) (sensitivity)> */
 749         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 750                 sizeof(struct sadb_lifetime) +
 751                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 752                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 753                         sizeof(struct sadb_address)*2 +
 754                                 sockaddr_size*2 +
 755                                         sizeof(struct sadb_x_sa2);
 756
 757         if ((xfrm_ctx = x->security)) {
 758                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 759                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 760         }
 761
 762         /* identity & sensitivity */
 763         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family))
 764                 size += sizeof(struct sadb_address) + sockaddr_size;
 765
 766         if (add_keys) {
 767                 if (x->aalg && x->aalg->alg_key_len) {
 768                         auth_key_size =
 769                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 770                         size += sizeof(struct sadb_key) + auth_key_size;
 771                 }
 772                 if (x->ealg && x->ealg->alg_key_len) {
 773                         encrypt_key_size =
 774                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 775                         size += sizeof(struct sadb_key) + encrypt_key_size;
 776                 }
 777         }
 778         if (x->encap)
 779                 natt = x->encap;
 780
 781         if (natt && natt->encap_type) {
 782                 size += sizeof(struct sadb_x_nat_t_type);
 783                 size += sizeof(struct sadb_x_nat_t_port);
 784                 size += sizeof(struct sadb_x_nat_t_port);
 785         }
 786
 787         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 788         if (skb == NULL)
 789                 return ERR_PTR(-ENOBUFS);
 790
 791         /* call should fill header later */
 792         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 793         memset(hdr, 0, size);   /* XXX do we need this ? */
 794         hdr->sadb_msg_len = size / sizeof(uint64_t);
 795
 796         /* sa */
 797         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 798         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 799         sa->sadb_sa_exttype = SADB_EXT_SA;
 800         sa->sadb_sa_spi = x->id.spi;
 801         sa->sadb_sa_replay = x->props.replay_window;
 802         switch (x->km.state) {
 803         case XFRM_STATE_VALID:
 804                 sa->sadb_sa_state = x->km.dying ?
 805                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 806                 break;
 807         case XFRM_STATE_ACQ:
 808                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 809                 break;
 810         default:
 811                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 812                 break;
 813         }
 814         sa->sadb_sa_auth = 0;
 815         if (x->aalg) {
 816                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 817                 sa->sadb_sa_auth = (a && a->pfkey_supported) ?
 818                                         a->desc.sadb_alg_id : 0;
 819         }
 820         sa->sadb_sa_encrypt = 0;
 821         BUG_ON(x->ealg && x->calg);
 822         if (x->ealg) {
 823                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 824                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 825                                         a->desc.sadb_alg_id : 0;
 826         }
 827         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 828         if (x->calg) {
 829                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 830                 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ?
 831                                         a->desc.sadb_alg_id : 0;
 832         }
 833
 834         sa->sadb_sa_flags = 0;
 835         if (x->props.flags & XFRM_STATE_NOECN)
 836                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 837         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 838                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 839         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 840                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 841
 842         /* hard time */
 843         if (hsc & 2) {
 844                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 845                                                              sizeof(struct sadb_lifetime));
 846                 lifetime->sadb_lifetime_len =
 847                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 848                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 849                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 850                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 851                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 852                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 853         }
 854         /* soft time */
 855         if (hsc & 1) {
 856                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 857                                                              sizeof(struct sadb_lifetime));
 858                 lifetime->sadb_lifetime_len =
 859                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 860                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 861                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 862                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 863                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 864                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 865         }
 866         /* current time */
 867         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 868                                                      sizeof(struct sadb_lifetime));
 869         lifetime->sadb_lifetime_len =
 870                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 871         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 872         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 873         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 874         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 875         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 876         /* src address */
 877         addr = (struct sadb_address*) skb_put(skb,
 878                                               sizeof(struct sadb_address)+sockaddr_size);
 879         addr->sadb_address_len =
 880                 (sizeof(struct sadb_address)+sockaddr_size)/
 881                         sizeof(uint64_t);
 882         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 883         /* "if the ports are non-zero, then the sadb_address_proto field,
 884            normally zero, MUST be filled in with the transport
 885            protocol's number." - RFC2367 */
 886         addr->sadb_address_proto = 0;
 887         addr->sadb_address_reserved = 0;
 888
 889         addr->sadb_address_prefixlen =
 890                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 891                                     (struct sockaddr *) (addr + 1),
 892                                     x->props.family);
 893         if (!addr->sadb_address_prefixlen)
 894                 BUG();
 895
 896         /* dst address */
 897         addr = (struct sadb_address*) skb_put(skb,
 898                                               sizeof(struct sadb_address)+sockaddr_size);
 899         addr->sadb_address_len =
 900                 (sizeof(struct sadb_address)+sockaddr_size)/
 901                         sizeof(uint64_t);
 902         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 903         addr->sadb_address_proto = 0;
 904         addr->sadb_address_reserved = 0;
 905
 906         addr->sadb_address_prefixlen =
 907                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 908                                     (struct sockaddr *) (addr + 1),
 909                                     x->props.family);
 910         if (!addr->sadb_address_prefixlen)
 911                 BUG();
 912
 913         if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr,
 914                              x->props.family)) {
 915                 addr = (struct sadb_address*) skb_put(skb,
 916                         sizeof(struct sadb_address)+sockaddr_size);
 917                 addr->sadb_address_len =
 918                         (sizeof(struct sadb_address)+sockaddr_size)/
 919                         sizeof(uint64_t);
 920                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 921                 addr->sadb_address_proto =
 922                         pfkey_proto_from_xfrm(x->sel.proto);
 923                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 924                 addr->sadb_address_reserved = 0;
 925
 926                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 927                                     (struct sockaddr *) (addr + 1),
 928                                     x->props.family);
 929         }
 930
 931         /* auth key */
 932         if (add_keys && auth_key_size) {
 933                 key = (struct sadb_key *) skb_put(skb,
 934                                                   sizeof(struct sadb_key)+auth_key_size);
 935                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 936                         sizeof(uint64_t);
 937                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 938                 key->sadb_key_bits = x->aalg->alg_key_len;
 939                 key->sadb_key_reserved = 0;
 940                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 941         }
 942         /* encrypt key */
 943         if (add_keys && encrypt_key_size) {
 944                 key = (struct sadb_key *) skb_put(skb,
 945                                                   sizeof(struct sadb_key)+encrypt_key_size);
 946                 key->sadb_key_len = (sizeof(struct sadb_key) +
 947                                      encrypt_key_size) / sizeof(uint64_t);
 948                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 949                 key->sadb_key_bits = x->ealg->alg_key_len;
 950                 key->sadb_key_reserved = 0;
 951                 memcpy(key + 1, x->ealg->alg_key,
 952                        (x->ealg->alg_key_len+7)/8);
 953         }
 954
 955         /* sa */
 956         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 957         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 958         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 959         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 960                 kfree_skb(skb);
 961                 return ERR_PTR(-EINVAL);
 962         }
 963         sa2->sadb_x_sa2_mode = mode;
 964         sa2->sadb_x_sa2_reserved1 = 0;
 965         sa2->sadb_x_sa2_reserved2 = 0;
 966         sa2->sadb_x_sa2_sequence = 0;
 967         sa2->sadb_x_sa2_reqid = x->props.reqid;
 968
 969         if (natt && natt->encap_type) {
 970                 struct sadb_x_nat_t_type *n_type;
 971                 struct sadb_x_nat_t_port *n_port;
 972
 973                 /* type */
 974                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 975                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 976                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 977                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 978                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 979                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 980                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 981
 982                 /* source port */
 983                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 984                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 985                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 986                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 987                 n_port->sadb_x_nat_t_port_reserved = 0;
 988
 989                 /* dest port */
 990                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 991                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 992                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 993                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 994                 n_port->sadb_x_nat_t_port_reserved = 0;
 995         }
 996
 997         /* security context */
 998         if (xfrm_ctx) {
 999                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1000                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1001                 sec_ctx->sadb_x_sec_len =
1002                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1003                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1004                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1005                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1006                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1007                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1008                        xfrm_ctx->ctx_len);
1009         }
1010
1011         return skb;
1012 }
1013
1014
1015 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1016 {
1017         struct sk_buff *skb;
1018
1019         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1020
1021         return skb;
1022 }
1023
1024 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1025                                                           int hsc)
1026 {
1027         return __pfkey_xfrm_state2msg(x, 0, hsc);
1028 }
1029
1030 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1031                                                 const struct sadb_msg *hdr,
1032                                                 void * const *ext_hdrs)
1033 {
1034         struct xfrm_state *x;
1035         const struct sadb_lifetime *lifetime;
1036         const struct sadb_sa *sa;
1037         const struct sadb_key *key;
1038         const struct sadb_x_sec_ctx *sec_ctx;
1039         uint16_t proto;
1040         int err;
1041
1042
1043         sa = ext_hdrs[SADB_EXT_SA - 1];
1044         if (!sa ||
1045             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1047                 return ERR_PTR(-EINVAL);
1048         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1049             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1050                 return ERR_PTR(-EINVAL);
1051         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1052             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1053                 return ERR_PTR(-EINVAL);
1054         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1055             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1056                 return ERR_PTR(-EINVAL);
1057
1058         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1059         if (proto == 0)
1060                 return ERR_PTR(-EINVAL);
1061
1062         /* default error is no buffer space */
1063         err = -ENOBUFS;
1064
1065         /* RFC2367:
1066
1067    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1068    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1069    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1070    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1071    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1072    not true.
1073
1074            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1075            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1076          */
1077         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1078             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1079              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1080             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1081                 return ERR_PTR(-EINVAL);
1082         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1083         if (key != NULL &&
1084             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1085             ((key->sadb_key_bits+7) / 8 == 0 ||
1086              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1087                 return ERR_PTR(-EINVAL);
1088         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1089         if (key != NULL &&
1090             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1091             ((key->sadb_key_bits+7) / 8 == 0 ||
1092              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1093                 return ERR_PTR(-EINVAL);
1094
1095         x = xfrm_state_alloc(net);
1096         if (x == NULL)
1097                 return ERR_PTR(-ENOBUFS);
1098
1099         x->id.proto = proto;
1100         x->id.spi = sa->sadb_sa_spi;
1101         x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay,
1102                                         (sizeof(x->replay.bitmap) * 8));
1103         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1104                 x->props.flags |= XFRM_STATE_NOECN;
1105         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1106                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1107         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1108                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1109
1110         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1111         if (lifetime != NULL) {
1112                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1113                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1114                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1115                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1116         }
1117         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1118         if (lifetime != NULL) {
1119                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1120                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1121                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1122                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1123         }
1124
1125         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1126         if (sec_ctx != NULL) {
1127                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1128
1129                 if (!uctx)
1130                         goto out;
1131
1132                 err = security_xfrm_state_alloc(x, uctx);
1133                 kfree(uctx);
1134
1135                 if (err)
1136                         goto out;
1137         }
1138
1139         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1140         if (sa->sadb_sa_auth) {
1141                 int keysize = 0;
1142                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1143                 if (!a || !a->pfkey_supported) {
1144                         err = -ENOSYS;
1145                         goto out;
1146                 }
1147                 if (key)
1148                         keysize = (key->sadb_key_bits + 7) / 8;
1149                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1150                 if (!x->aalg)
1151                         goto out;
1152                 strcpy(x->aalg->alg_name, a->name);
1153                 x->aalg->alg_key_len = 0;
1154                 if (key) {
1155                         x->aalg->alg_key_len = key->sadb_key_bits;
1156                         memcpy(x->aalg->alg_key, key+1, keysize);
1157                 }
1158                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1159                 x->props.aalgo = sa->sadb_sa_auth;
1160                 /* x->algo.flags = sa->sadb_sa_flags; */
1161         }
1162         if (sa->sadb_sa_encrypt) {
1163                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1164                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1165                         if (!a || !a->pfkey_supported) {
1166                                 err = -ENOSYS;
1167                                 goto out;
1168                         }
1169                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1170                         if (!x->calg)
1171                                 goto out;
1172                         strcpy(x->calg->alg_name, a->name);
1173                         x->props.calgo = sa->sadb_sa_encrypt;
1174                 } else {
1175                         int keysize = 0;
1176                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1177                         if (!a || !a->pfkey_supported) {
1178                                 err = -ENOSYS;
1179                                 goto out;
1180                         }
1181                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1182                         if (key)
1183                                 keysize = (key->sadb_key_bits + 7) / 8;
1184                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1185                         if (!x->ealg)
1186                                 goto out;
1187                         strcpy(x->ealg->alg_name, a->name);
1188                         x->ealg->alg_key_len = 0;
1189                         if (key) {
1190                                 x->ealg->alg_key_len = key->sadb_key_bits;
1191                                 memcpy(x->ealg->alg_key, key+1, keysize);
1192                         }
1193                         x->props.ealgo = sa->sadb_sa_encrypt;
1194                 }
1195         }
1196         /* x->algo.flags = sa->sadb_sa_flags; */
1197
1198         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1199                                                     &x->props.saddr);
1200         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1201                                   &x->id.daddr);
1202
1203         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1204                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1205                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1206                 if (mode < 0) {
1207                         err = -EINVAL;
1208                         goto out;
1209                 }
1210                 x->props.mode = mode;
1211                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1212         }
1213
1214         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1215                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1216
1217                 /* Nobody uses this, but we try. */
1218                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1219                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1220         }
1221
1222         if (!x->sel.family)
1223                 x->sel.family = x->props.family;
1224
1225         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1226                 const struct sadb_x_nat_t_type* n_type;
1227                 struct xfrm_encap_tmpl *natt;
1228
1229                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1230                 if (!x->encap)
1231                         goto out;
1232
1233                 natt = x->encap;
1234                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1235                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1236
1237                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1238                         const struct sadb_x_nat_t_port *n_port =
1239                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1240                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1241                 }
1242                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1243                         const struct sadb_x_nat_t_port *n_port =
1244                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1245                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1246                 }
1247                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1248         }
1249
1250         err = xfrm_init_state(x);
1251         if (err)
1252                 goto out;
1253
1254         x->km.seq = hdr->sadb_msg_seq;
1255         return x;
1256
1257 out:
1258         x->km.state = XFRM_STATE_DEAD;
1259         xfrm_state_put(x);
1260         return ERR_PTR(err);
1261 }
1262
1263 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1264 {
1265         return -EOPNOTSUPP;
1266 }
1267
1268 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1269 {
1270         struct net *net = sock_net(sk);
1271         struct sk_buff *resp_skb;
1272         struct sadb_x_sa2 *sa2;
1273         struct sadb_address *saddr, *daddr;
1274         struct sadb_msg *out_hdr;
1275         struct sadb_spirange *range;
1276         struct xfrm_state *x = NULL;
1277         int mode;
1278         int err;
1279         u32 min_spi, max_spi;
1280         u32 reqid;
1281         u8 proto;
1282         unsigned short family;
1283         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1284
1285         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1286                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1287                 return -EINVAL;
1288
1289         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1290         if (proto == 0)
1291                 return -EINVAL;
1292
1293         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1294                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1295                 if (mode < 0)
1296                         return -EINVAL;
1297                 reqid = sa2->sadb_x_sa2_reqid;
1298         } else {
1299                 mode = 0;
1300                 reqid = 0;
1301         }
1302
1303         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1304         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1305
1306         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1307         switch (family) {
1308         case AF_INET:
1309                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1310                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1311                 break;
1312 #if IS_ENABLED(CONFIG_IPV6)
1313         case AF_INET6:
1314                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1315                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1316                 break;
1317 #endif
1318         }
1319
1320         if (hdr->sadb_msg_seq) {
1321                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1322                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1323                         xfrm_state_put(x);
1324                         x = NULL;
1325                 }
1326         }
1327
1328         if (!x)
1329                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1330
1331         if (x == NULL)
1332                 return -ENOENT;
1333
1334         min_spi = 0x100;
1335         max_spi = 0x0fffffff;
1336
1337         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1338         if (range) {
1339                 min_spi = range->sadb_spirange_min;
1340                 max_spi = range->sadb_spirange_max;
1341         }
1342
1343         err = verify_spi_info(x->id.proto, min_spi, max_spi);
1344         if (err) {
1345                 xfrm_state_put(x);
1346                 return err;
1347         }
1348
1349         err = xfrm_alloc_spi(x, min_spi, max_spi);
1350         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1351
1352         if (IS_ERR(resp_skb)) {
1353                 xfrm_state_put(x);
1354                 return  PTR_ERR(resp_skb);
1355         }
1356
1357         out_hdr = (struct sadb_msg *) resp_skb->data;
1358         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1359         out_hdr->sadb_msg_type = SADB_GETSPI;
1360         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1361         out_hdr->sadb_msg_errno = 0;
1362         out_hdr->sadb_msg_reserved = 0;
1363         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1364         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1365
1366         xfrm_state_put(x);
1367
1368         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1369
1370         return 0;
1371 }
1372
1373 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1374 {
1375         struct net *net = sock_net(sk);
1376         struct xfrm_state *x;
1377
1378         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1379                 return -EOPNOTSUPP;
1380
1381         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1382                 return 0;
1383
1384         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1385         if (x == NULL)
1386                 return 0;
1387
1388         spin_lock_bh(&x->lock);
1389         if (x->km.state == XFRM_STATE_ACQ)
1390                 x->km.state = XFRM_STATE_ERROR;
1391
1392         spin_unlock_bh(&x->lock);
1393         xfrm_state_put(x);
1394         return 0;
1395 }
1396
1397 static inline int event2poltype(int event)
1398 {
1399         switch (event) {
1400         case XFRM_MSG_DELPOLICY:
1401                 return SADB_X_SPDDELETE;
1402         case XFRM_MSG_NEWPOLICY:
1403                 return SADB_X_SPDADD;
1404         case XFRM_MSG_UPDPOLICY:
1405                 return SADB_X_SPDUPDATE;
1406         case XFRM_MSG_POLEXPIRE:
1407         //      return SADB_X_SPDEXPIRE;
1408         default:
1409                 pr_err("pfkey: Unknown policy event %d\n", event);
1410                 break;
1411         }
1412
1413         return 0;
1414 }
1415
1416 static inline int event2keytype(int event)
1417 {
1418         switch (event) {
1419         case XFRM_MSG_DELSA:
1420                 return SADB_DELETE;
1421         case XFRM_MSG_NEWSA:
1422                 return SADB_ADD;
1423         case XFRM_MSG_UPDSA:
1424                 return SADB_UPDATE;
1425         case XFRM_MSG_EXPIRE:
1426                 return SADB_EXPIRE;
1427         default:
1428                 pr_err("pfkey: Unknown SA event %d\n", event);
1429                 break;
1430         }
1431
1432         return 0;
1433 }
1434
1435 /* ADD/UPD/DEL */
1436 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1437 {
1438         struct sk_buff *skb;
1439         struct sadb_msg *hdr;
1440
1441         skb = pfkey_xfrm_state2msg(x);
1442
1443         if (IS_ERR(skb))
1444                 return PTR_ERR(skb);
1445
1446         hdr = (struct sadb_msg *) skb->data;
1447         hdr->sadb_msg_version = PF_KEY_V2;
1448         hdr->sadb_msg_type = event2keytype(c->event);
1449         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1450         hdr->sadb_msg_errno = 0;
1451         hdr->sadb_msg_reserved = 0;
1452         hdr->sadb_msg_seq = c->seq;
1453         hdr->sadb_msg_pid = c->portid;
1454
1455         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1456
1457         return 0;
1458 }
1459
1460 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1461 {
1462         struct net *net = sock_net(sk);
1463         struct xfrm_state *x;
1464         int err;
1465         struct km_event c;
1466
1467         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1468         if (IS_ERR(x))
1469                 return PTR_ERR(x);
1470
1471         xfrm_state_hold(x);
1472         if (hdr->sadb_msg_type == SADB_ADD)
1473                 err = xfrm_state_add(x);
1474         else
1475                 err = xfrm_state_update(x);
1476
1477         xfrm_audit_state_add(x, err ? 0 : 1,
1478                              audit_get_loginuid(current),
1479                              audit_get_sessionid(current), 0);
1480
1481         if (err < 0) {
1482                 x->km.state = XFRM_STATE_DEAD;
1483                 __xfrm_state_put(x);
1484                 goto out;
1485         }
1486
1487         if (hdr->sadb_msg_type == SADB_ADD)
1488                 c.event = XFRM_MSG_NEWSA;
1489         else
1490                 c.event = XFRM_MSG_UPDSA;
1491         c.seq = hdr->sadb_msg_seq;
1492         c.portid = hdr->sadb_msg_pid;
1493         km_state_notify(x, &c);
1494 out:
1495         xfrm_state_put(x);
1496         return err;
1497 }
1498
1499 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1500 {
1501         struct net *net = sock_net(sk);
1502         struct xfrm_state *x;
1503         struct km_event c;
1504         int err;
1505
1506         if (!ext_hdrs[SADB_EXT_SA-1] ||
1507             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1508                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1509                 return -EINVAL;
1510
1511         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1512         if (x == NULL)
1513                 return -ESRCH;
1514
1515         if ((err = security_xfrm_state_delete(x)))
1516                 goto out;
1517
1518         if (xfrm_state_kern(x)) {
1519                 err = -EPERM;
1520                 goto out;
1521         }
1522
1523         err = xfrm_state_delete(x);
1524
1525         if (err < 0)
1526                 goto out;
1527
1528         c.seq = hdr->sadb_msg_seq;
1529         c.portid = hdr->sadb_msg_pid;
1530         c.event = XFRM_MSG_DELSA;
1531         km_state_notify(x, &c);
1532 out:
1533         xfrm_audit_state_delete(x, err ? 0 : 1,
1534                                 audit_get_loginuid(current),
1535                                 audit_get_sessionid(current), 0);
1536         xfrm_state_put(x);
1537
1538         return err;
1539 }
1540
1541 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1542 {
1543         struct net *net = sock_net(sk);
1544         __u8 proto;
1545         struct sk_buff *out_skb;
1546         struct sadb_msg *out_hdr;
1547         struct xfrm_state *x;
1548
1549         if (!ext_hdrs[SADB_EXT_SA-1] ||
1550             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1551                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1552                 return -EINVAL;
1553
1554         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1555         if (x == NULL)
1556                 return -ESRCH;
1557
1558         out_skb = pfkey_xfrm_state2msg(x);
1559         proto = x->id.proto;
1560         xfrm_state_put(x);
1561         if (IS_ERR(out_skb))
1562                 return  PTR_ERR(out_skb);
1563
1564         out_hdr = (struct sadb_msg *) out_skb->data;
1565         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1566         out_hdr->sadb_msg_type = SADB_GET;
1567         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1568         out_hdr->sadb_msg_errno = 0;
1569         out_hdr->sadb_msg_reserved = 0;
1570         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1571         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1572         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1573
1574         return 0;
1575 }
1576
1577 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1578                                               gfp_t allocation)
1579 {
1580         struct sk_buff *skb;
1581         struct sadb_msg *hdr;
1582         int len, auth_len, enc_len, i;
1583
1584         auth_len = xfrm_count_pfkey_auth_supported();
1585         if (auth_len) {
1586                 auth_len *= sizeof(struct sadb_alg);
1587                 auth_len += sizeof(struct sadb_supported);
1588         }
1589
1590         enc_len = xfrm_count_pfkey_enc_supported();
1591         if (enc_len) {
1592                 enc_len *= sizeof(struct sadb_alg);
1593                 enc_len += sizeof(struct sadb_supported);
1594         }
1595
1596         len = enc_len + auth_len + sizeof(struct sadb_msg);
1597
1598         skb = alloc_skb(len + 16, allocation);
1599         if (!skb)
1600                 goto out_put_algs;
1601
1602         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1603         pfkey_hdr_dup(hdr, orig);
1604         hdr->sadb_msg_errno = 0;
1605         hdr->sadb_msg_len = len / sizeof(uint64_t);
1606
1607         if (auth_len) {
1608                 struct sadb_supported *sp;
1609                 struct sadb_alg *ap;
1610
1611                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1612                 ap = (struct sadb_alg *) (sp + 1);
1613
1614                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1615                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1616
1617                 for (i = 0; ; i++) {
1618                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1619                         if (!aalg)
1620                                 break;
1621                         if (!aalg->pfkey_supported)
1622                                 continue;
1623                         if (aalg->available)
1624                                 *ap++ = aalg->desc;
1625                 }
1626         }
1627
1628         if (enc_len) {
1629                 struct sadb_supported *sp;
1630                 struct sadb_alg *ap;
1631
1632                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1633                 ap = (struct sadb_alg *) (sp + 1);
1634
1635                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1636                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1637
1638                 for (i = 0; ; i++) {
1639                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1640                         if (!ealg)
1641                                 break;
1642                         if (!ealg->pfkey_supported)
1643                                 continue;
1644                         if (ealg->available)
1645                                 *ap++ = ealg->desc;
1646                 }
1647         }
1648
1649 out_put_algs:
1650         return skb;
1651 }
1652
1653 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1654 {
1655         struct pfkey_sock *pfk = pfkey_sk(sk);
1656         struct sk_buff *supp_skb;
1657
1658         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1659                 return -EINVAL;
1660
1661         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1662                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1663                         return -EEXIST;
1664                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1665         }
1666
1667         xfrm_probe_algs();
1668
1669         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1670         if (!supp_skb) {
1671                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1672                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1673
1674                 return -ENOBUFS;
1675         }
1676
1677         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1678
1679         return 0;
1680 }
1681
1682 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1683 {
1684         struct sk_buff *skb;
1685         struct sadb_msg *hdr;
1686
1687         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1688         if (!skb)
1689                 return -ENOBUFS;
1690
1691         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1692         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1693         hdr->sadb_msg_errno = (uint8_t) 0;
1694         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1695
1696         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1697 }
1698
1699 static int key_notify_sa_flush(const struct km_event *c)
1700 {
1701         struct sk_buff *skb;
1702         struct sadb_msg *hdr;
1703
1704         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1705         if (!skb)
1706                 return -ENOBUFS;
1707         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1708         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1709         hdr->sadb_msg_type = SADB_FLUSH;
1710         hdr->sadb_msg_seq = c->seq;
1711         hdr->sadb_msg_pid = c->portid;
1712         hdr->sadb_msg_version = PF_KEY_V2;
1713         hdr->sadb_msg_errno = (uint8_t) 0;
1714         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1715         hdr->sadb_msg_reserved = 0;
1716
1717         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1718
1719         return 0;
1720 }
1721
1722 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1723 {
1724         struct net *net = sock_net(sk);
1725         unsigned int proto;
1726         struct km_event c;
1727         struct xfrm_audit audit_info;
1728         int err, err2;
1729
1730         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1731         if (proto == 0)
1732                 return -EINVAL;
1733
1734         audit_info.loginuid = audit_get_loginuid(current);
1735         audit_info.sessionid = audit_get_sessionid(current);
1736         audit_info.secid = 0;
1737         err = xfrm_state_flush(net, proto, &audit_info);
1738         err2 = unicast_flush_resp(sk, hdr);
1739         if (err || err2) {
1740                 if (err == -ESRCH) /* empty table - go quietly */
1741                         err = 0;
1742                 return err ? err : err2;
1743         }
1744
1745         c.data.proto = proto;
1746         c.seq = hdr->sadb_msg_seq;
1747         c.portid = hdr->sadb_msg_pid;
1748         c.event = XFRM_MSG_FLUSHSA;
1749         c.net = net;
1750         km_state_notify(NULL, &c);
1751
1752         return 0;
1753 }
1754
1755 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1756 {
1757         struct pfkey_sock *pfk = ptr;
1758         struct sk_buff *out_skb;
1759         struct sadb_msg *out_hdr;
1760
1761         if (!pfkey_can_dump(&pfk->sk))
1762                 return -ENOBUFS;
1763
1764         out_skb = pfkey_xfrm_state2msg(x);
1765         if (IS_ERR(out_skb))
1766                 return PTR_ERR(out_skb);
1767
1768         out_hdr = (struct sadb_msg *) out_skb->data;
1769         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1770         out_hdr->sadb_msg_type = SADB_DUMP;
1771         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1772         out_hdr->sadb_msg_errno = 0;
1773         out_hdr->sadb_msg_reserved = 0;
1774         out_hdr->sadb_msg_seq = count + 1;
1775         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1776
1777         if (pfk->dump.skb)
1778                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1779                                 &pfk->sk, sock_net(&pfk->sk));
1780         pfk->dump.skb = out_skb;
1781
1782         return 0;
1783 }
1784
1785 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1786 {
1787         struct net *net = sock_net(&pfk->sk);
1788         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1789 }
1790
1791 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1792 {
1793         struct net *net = sock_net(&pfk->sk);
1794
1795         xfrm_state_walk_done(&pfk->dump.u.state, net);
1796 }
1797
1798 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1799 {
1800         u8 proto;
1801         struct pfkey_sock *pfk = pfkey_sk(sk);
1802
1803         if (pfk->dump.dump != NULL)
1804                 return -EBUSY;
1805
1806         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1807         if (proto == 0)
1808                 return -EINVAL;
1809
1810         pfk->dump.msg_version = hdr->sadb_msg_version;
1811         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1812         pfk->dump.dump = pfkey_dump_sa;
1813         pfk->dump.done = pfkey_dump_sa_done;
1814         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1815
1816         return pfkey_do_dump(pfk);
1817 }
1818
1819 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1820 {
1821         struct pfkey_sock *pfk = pfkey_sk(sk);
1822         int satype = hdr->sadb_msg_satype;
1823         bool reset_errno = false;
1824
1825         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1826                 reset_errno = true;
1827                 if (satype != 0 && satype != 1)
1828                         return -EINVAL;
1829                 pfk->promisc = satype;
1830         }
1831         if (reset_errno && skb_cloned(skb))
1832                 skb = skb_copy(skb, GFP_KERNEL);
1833         else
1834                 skb = skb_clone(skb, GFP_KERNEL);
1835
1836         if (reset_errno && skb) {
1837                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1838                 new_hdr->sadb_msg_errno = 0;
1839         }
1840
1841         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1842         return 0;
1843 }
1844
1845 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1846 {
1847         int i;
1848         u32 reqid = *(u32*)ptr;
1849
1850         for (i=0; i<xp->xfrm_nr; i++) {
1851                 if (xp->xfrm_vec[i].reqid == reqid)
1852                         return -EEXIST;
1853         }
1854         return 0;
1855 }
1856
1857 static u32 gen_reqid(struct net *net)
1858 {
1859         struct xfrm_policy_walk walk;
1860         u32 start;
1861         int rc;
1862         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1863
1864         start = reqid;
1865         do {
1866                 ++reqid;
1867                 if (reqid == 0)
1868                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1869                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1870                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1871                 xfrm_policy_walk_done(&walk, net);
1872                 if (rc != -EEXIST)
1873                         return reqid;
1874         } while (reqid != start);
1875         return 0;
1876 }
1877
1878 static int
1879 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1880 {
1881         struct net *net = xp_net(xp);
1882         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1883         int mode;
1884
1885         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1886                 return -ELOOP;
1887
1888         if (rq->sadb_x_ipsecrequest_mode == 0)
1889                 return -EINVAL;
1890
1891         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1892         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1893                 return -EINVAL;
1894         t->mode = mode;
1895         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1896                 t->optional = 1;
1897         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1898                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1899                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1900                         t->reqid = 0;
1901                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1902                         return -ENOBUFS;
1903         }
1904
1905         /* addresses present only in tunnel mode */
1906         if (t->mode == XFRM_MODE_TUNNEL) {
1907                 u8 *sa = (u8 *) (rq + 1);
1908                 int family, socklen;
1909
1910                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1911                                                 &t->saddr);
1912                 if (!family)
1913                         return -EINVAL;
1914
1915                 socklen = pfkey_sockaddr_len(family);
1916                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1917                                            &t->id.daddr) != family)
1918                         return -EINVAL;
1919                 t->encap_family = family;
1920         } else
1921                 t->encap_family = xp->family;
1922
1923         /* No way to set this via kame pfkey */
1924         t->allalgs = 1;
1925         xp->xfrm_nr++;
1926         return 0;
1927 }
1928
1929 static int
1930 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1931 {
1932         int err;
1933         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1934         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1935
1936         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1937                 return -EINVAL;
1938
1939         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1940                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1941                         return err;
1942                 len -= rq->sadb_x_ipsecrequest_len;
1943                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1944         }
1945         return 0;
1946 }
1947
1948 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1949 {
1950   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1951
1952         if (xfrm_ctx) {
1953                 int len = sizeof(struct sadb_x_sec_ctx);
1954                 len += xfrm_ctx->ctx_len;
1955                 return PFKEY_ALIGN8(len);
1956         }
1957         return 0;
1958 }
1959
1960 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1961 {
1962         const struct xfrm_tmpl *t;
1963         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1964         int socklen = 0;
1965         int i;
1966
1967         for (i=0; i<xp->xfrm_nr; i++) {
1968                 t = xp->xfrm_vec + i;
1969                 socklen += pfkey_sockaddr_len(t->encap_family);
1970         }
1971
1972         return sizeof(struct sadb_msg) +
1973                 (sizeof(struct sadb_lifetime) * 3) +
1974                 (sizeof(struct sadb_address) * 2) +
1975                 (sockaddr_size * 2) +
1976                 sizeof(struct sadb_x_policy) +
1977                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1978                 (socklen * 2) +
1979                 pfkey_xfrm_policy2sec_ctx_size(xp);
1980 }
1981
1982 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1983 {
1984         struct sk_buff *skb;
1985         int size;
1986
1987         size = pfkey_xfrm_policy2msg_size(xp);
1988
1989         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1990         if (skb == NULL)
1991                 return ERR_PTR(-ENOBUFS);
1992
1993         return skb;
1994 }
1995
1996 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1997 {
1998         struct sadb_msg *hdr;
1999         struct sadb_address *addr;
2000         struct sadb_lifetime *lifetime;
2001         struct sadb_x_policy *pol;
2002         struct sadb_x_sec_ctx *sec_ctx;
2003         struct xfrm_sec_ctx *xfrm_ctx;
2004         int i;
2005         int size;
2006         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2007         int socklen = pfkey_sockaddr_len(xp->family);
2008
2009         size = pfkey_xfrm_policy2msg_size(xp);
2010
2011         /* call should fill header later */
2012         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2013         memset(hdr, 0, size);   /* XXX do we need this ? */
2014
2015         /* src address */
2016         addr = (struct sadb_address*) skb_put(skb,
2017                                               sizeof(struct sadb_address)+sockaddr_size);
2018         addr->sadb_address_len =
2019                 (sizeof(struct sadb_address)+sockaddr_size)/
2020                         sizeof(uint64_t);
2021         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2022         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2023         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2024         addr->sadb_address_reserved = 0;
2025         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2026                                  xp->selector.sport,
2027                                  (struct sockaddr *) (addr + 1),
2028                                  xp->family))
2029                 BUG();
2030
2031         /* dst address */
2032         addr = (struct sadb_address*) skb_put(skb,
2033                                               sizeof(struct sadb_address)+sockaddr_size);
2034         addr->sadb_address_len =
2035                 (sizeof(struct sadb_address)+sockaddr_size)/
2036                         sizeof(uint64_t);
2037         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2038         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2039         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2040         addr->sadb_address_reserved = 0;
2041
2042         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2043                             (struct sockaddr *) (addr + 1),
2044                             xp->family);
2045
2046         /* hard time */
2047         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2048                                                      sizeof(struct sadb_lifetime));
2049         lifetime->sadb_lifetime_len =
2050                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2051         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2052         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2053         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2054         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2055         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2056         /* soft time */
2057         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2058                                                      sizeof(struct sadb_lifetime));
2059         lifetime->sadb_lifetime_len =
2060                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2061         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2062         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2063         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2064         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2065         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2066         /* current time */
2067         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2068                                                      sizeof(struct sadb_lifetime));
2069         lifetime->sadb_lifetime_len =
2070                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2071         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2072         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2073         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2074         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2075         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2076
2077         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2078         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2079         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2080         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2081         if (xp->action == XFRM_POLICY_ALLOW) {
2082                 if (xp->xfrm_nr)
2083                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2084                 else
2085                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2086         }
2087         pol->sadb_x_policy_dir = dir+1;
2088         pol->sadb_x_policy_reserved = 0;
2089         pol->sadb_x_policy_id = xp->index;
2090         pol->sadb_x_policy_priority = xp->priority;
2091
2092         for (i=0; i<xp->xfrm_nr; i++) {
2093                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2094                 struct sadb_x_ipsecrequest *rq;
2095                 int req_size;
2096                 int mode;
2097
2098                 req_size = sizeof(struct sadb_x_ipsecrequest);
2099                 if (t->mode == XFRM_MODE_TUNNEL) {
2100                         socklen = pfkey_sockaddr_len(t->encap_family);
2101                         req_size += socklen * 2;
2102                 } else {
2103                         size -= 2*socklen;
2104                 }
2105                 rq = (void*)skb_put(skb, req_size);
2106                 pol->sadb_x_policy_len += req_size/8;
2107                 memset(rq, 0, sizeof(*rq));
2108                 rq->sadb_x_ipsecrequest_len = req_size;
2109                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2110                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2111                         return -EINVAL;
2112                 rq->sadb_x_ipsecrequest_mode = mode;
2113                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2114                 if (t->reqid)
2115                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2116                 if (t->optional)
2117                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2118                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2119
2120                 if (t->mode == XFRM_MODE_TUNNEL) {
2121                         u8 *sa = (void *)(rq + 1);
2122                         pfkey_sockaddr_fill(&t->saddr, 0,
2123                                             (struct sockaddr *)sa,
2124                                             t->encap_family);
2125                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2126                                             (struct sockaddr *) (sa + socklen),
2127                                             t->encap_family);
2128                 }
2129         }
2130
2131         /* security context */
2132         if ((xfrm_ctx = xp->security)) {
2133                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2134
2135                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2136                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2137                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2138                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2139                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2140                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2141                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2142                        xfrm_ctx->ctx_len);
2143         }
2144
2145         hdr->sadb_msg_len = size / sizeof(uint64_t);
2146         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2147
2148         return 0;
2149 }
2150
2151 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2152 {
2153         struct sk_buff *out_skb;
2154         struct sadb_msg *out_hdr;
2155         int err;
2156
2157         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2158         if (IS_ERR(out_skb))
2159                 return PTR_ERR(out_skb);
2160
2161         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2162         if (err < 0)
2163                 return err;
2164
2165         out_hdr = (struct sadb_msg *) out_skb->data;
2166         out_hdr->sadb_msg_version = PF_KEY_V2;
2167
2168         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2169                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2170         else
2171                 out_hdr->sadb_msg_type = event2poltype(c->event);
2172         out_hdr->sadb_msg_errno = 0;
2173         out_hdr->sadb_msg_seq = c->seq;
2174         out_hdr->sadb_msg_pid = c->portid;
2175         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2176         return 0;
2177
2178 }
2179
2180 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2181 {
2182         struct net *net = sock_net(sk);
2183         int err = 0;
2184         struct sadb_lifetime *lifetime;
2185         struct sadb_address *sa;
2186         struct sadb_x_policy *pol;
2187         struct xfrm_policy *xp;
2188         struct km_event c;
2189         struct sadb_x_sec_ctx *sec_ctx;
2190
2191         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2192                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2193             !ext_hdrs[SADB_X_EXT_POLICY-1])
2194                 return -EINVAL;
2195
2196         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2197         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2198                 return -EINVAL;
2199         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2200                 return -EINVAL;
2201
2202         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2203         if (xp == NULL)
2204                 return -ENOBUFS;
2205
2206         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2207                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2208         xp->priority = pol->sadb_x_policy_priority;
2209
2210         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2211         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2212         xp->selector.family = xp->family;
2213         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2214         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2215         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2216         if (xp->selector.sport)
2217                 xp->selector.sport_mask = htons(0xffff);
2218
2219         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2220         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2221         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2222
2223         /* Amusing, we set this twice.  KAME apps appear to set same value
2224          * in both addresses.
2225          */
2226         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2227
2228         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2229         if (xp->selector.dport)
2230                 xp->selector.dport_mask = htons(0xffff);
2231
2232         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2233         if (sec_ctx != NULL) {
2234                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2235
2236                 if (!uctx) {
2237                         err = -ENOBUFS;
2238                         goto out;
2239                 }
2240
2241                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2242                 kfree(uctx);
2243
2244                 if (err)
2245                         goto out;
2246         }
2247
2248         xp->lft.soft_byte_limit = XFRM_INF;
2249         xp->lft.hard_byte_limit = XFRM_INF;
2250         xp->lft.soft_packet_limit = XFRM_INF;
2251         xp->lft.hard_packet_limit = XFRM_INF;
2252         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2253                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2254                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2255                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2256                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2257         }
2258         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2259                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2260                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2261                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2262                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2263         }
2264         xp->xfrm_nr = 0;
2265         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2266             (err = parse_ipsecrequests(xp, pol)) < 0)
2267                 goto out;
2268
2269         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2270                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2271
2272         xfrm_audit_policy_add(xp, err ? 0 : 1,
2273                               audit_get_loginuid(current),
2274                               audit_get_sessionid(current), 0);
2275
2276         if (err)
2277                 goto out;
2278
2279         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2280                 c.event = XFRM_MSG_UPDPOLICY;
2281         else
2282                 c.event = XFRM_MSG_NEWPOLICY;
2283
2284         c.seq = hdr->sadb_msg_seq;
2285         c.portid = hdr->sadb_msg_pid;
2286
2287         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2288         xfrm_pol_put(xp);
2289         return 0;
2290
2291 out:
2292         xp->walk.dead = 1;
2293         xfrm_policy_destroy(xp);
2294         return err;
2295 }
2296
2297 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2298 {
2299         struct net *net = sock_net(sk);
2300         int err;
2301         struct sadb_address *sa;
2302         struct sadb_x_policy *pol;
2303         struct xfrm_policy *xp;
2304         struct xfrm_selector sel;
2305         struct km_event c;
2306         struct sadb_x_sec_ctx *sec_ctx;
2307         struct xfrm_sec_ctx *pol_ctx = NULL;
2308
2309         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2310                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2311             !ext_hdrs[SADB_X_EXT_POLICY-1])
2312                 return -EINVAL;
2313
2314         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2315         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2316                 return -EINVAL;
2317
2318         memset(&sel, 0, sizeof(sel));
2319
2320         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2321         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2322         sel.prefixlen_s = sa->sadb_address_prefixlen;
2323         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2324         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2325         if (sel.sport)
2326                 sel.sport_mask = htons(0xffff);
2327
2328         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2329         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2330         sel.prefixlen_d = sa->sadb_address_prefixlen;
2331         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2332         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2333         if (sel.dport)
2334                 sel.dport_mask = htons(0xffff);
2335
2336         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2337         if (sec_ctx != NULL) {
2338                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2339
2340                 if (!uctx)
2341                         return -ENOMEM;
2342
2343                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2344                 kfree(uctx);
2345                 if (err)
2346                         return err;
2347         }
2348
2349         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2350                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2351                                    1, &err);
2352         security_xfrm_policy_free(pol_ctx);
2353         if (xp == NULL)
2354                 return -ENOENT;
2355
2356         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2357                                  audit_get_loginuid(current),
2358                                  audit_get_sessionid(current), 0);
2359
2360         if (err)
2361                 goto out;
2362
2363         c.seq = hdr->sadb_msg_seq;
2364         c.portid = hdr->sadb_msg_pid;
2365         c.data.byid = 0;
2366         c.event = XFRM_MSG_DELPOLICY;
2367         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2368
2369 out:
2370         xfrm_pol_put(xp);
2371         if (err == 0)
2372                 xfrm_garbage_collect(net);
2373         return err;
2374 }
2375
2376 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2377 {
2378         int err;
2379         struct sk_buff *out_skb;
2380         struct sadb_msg *out_hdr;
2381         err = 0;
2382
2383         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2384         if (IS_ERR(out_skb)) {
2385                 err =  PTR_ERR(out_skb);
2386                 goto out;
2387         }
2388         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2389         if (err < 0)
2390                 goto out;
2391
2392         out_hdr = (struct sadb_msg *) out_skb->data;
2393         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2394         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2395         out_hdr->sadb_msg_satype = 0;
2396         out_hdr->sadb_msg_errno = 0;
2397         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2398         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2399         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2400         err = 0;
2401
2402 out:
2403         return err;
2404 }
2405
2406 #ifdef CONFIG_NET_KEY_MIGRATE
2407 static int pfkey_sockaddr_pair_size(sa_family_t family)
2408 {
2409         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2410 }
2411
2412 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2413                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2414                                u16 *family)
2415 {
2416         int af, socklen;
2417
2418         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2419                 return -EINVAL;
2420
2421         af = pfkey_sockaddr_extract(sa, saddr);
2422         if (!af)
2423                 return -EINVAL;
2424
2425         socklen = pfkey_sockaddr_len(af);
2426         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2427                                    daddr) != af)
2428                 return -EINVAL;
2429
2430         *family = af;
2431         return 0;
2432 }
2433
2434 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2435                                     struct xfrm_migrate *m)
2436 {
2437         int err;
2438         struct sadb_x_ipsecrequest *rq2;
2439         int mode;
2440
2441         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2442             len < rq1->sadb_x_ipsecrequest_len)
2443                 return -EINVAL;
2444
2445         /* old endoints */
2446         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2447                                   rq1->sadb_x_ipsecrequest_len,
2448                                   &m->old_saddr, &m->old_daddr,
2449                                   &m->old_family);
2450         if (err)
2451                 return err;
2452
2453         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2454         len -= rq1->sadb_x_ipsecrequest_len;
2455
2456         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2457             len < rq2->sadb_x_ipsecrequest_len)
2458                 return -EINVAL;
2459
2460         /* new endpoints */
2461         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2462                                   rq2->sadb_x_ipsecrequest_len,
2463                                   &m->new_saddr, &m->new_daddr,
2464                                   &m->new_family);
2465         if (err)
2466                 return err;
2467
2468         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2469             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2470             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2471                 return -EINVAL;
2472
2473         m->proto = rq1->sadb_x_ipsecrequest_proto;
2474         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2475                 return -EINVAL;
2476         m->mode = mode;
2477         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2478
2479         return ((int)(rq1->sadb_x_ipsecrequest_len +
2480                       rq2->sadb_x_ipsecrequest_len));
2481 }
2482
2483 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2484                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2485 {
2486         int i, len, ret, err = -EINVAL;
2487         u8 dir;
2488         struct sadb_address *sa;
2489         struct sadb_x_kmaddress *kma;
2490         struct sadb_x_policy *pol;
2491         struct sadb_x_ipsecrequest *rq;
2492         struct xfrm_selector sel;
2493         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2494         struct xfrm_kmaddress k;
2495         struct net *net = sock_net(sk);
2496
2497         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2498                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2499             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2500                 err = -EINVAL;
2501                 goto out;
2502         }
2503
2504         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2505         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2506
2507         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2508                 err = -EINVAL;
2509                 goto out;
2510         }
2511
2512         if (kma) {
2513                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2514                 k.reserved = kma->sadb_x_kmaddress_reserved;
2515                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2516                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2517                                           &k.local, &k.remote, &k.family);
2518                 if (ret < 0) {
2519                         err = ret;
2520                         goto out;
2521                 }
2522         }
2523
2524         dir = pol->sadb_x_policy_dir - 1;
2525         memset(&sel, 0, sizeof(sel));
2526
2527         /* set source address info of selector */
2528         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2529         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2530         sel.prefixlen_s = sa->sadb_address_prefixlen;
2531         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2532         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2533         if (sel.sport)
2534                 sel.sport_mask = htons(0xffff);
2535
2536         /* set destination address info of selector */
2537         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2538         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2539         sel.prefixlen_d = sa->sadb_address_prefixlen;
2540         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2541         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2542         if (sel.dport)
2543                 sel.dport_mask = htons(0xffff);
2544
2545         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2546
2547         /* extract ipsecrequests */
2548         i = 0;
2549         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2550
2551         while (len > 0 && i < XFRM_MAX_DEPTH) {
2552                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2553                 if (ret < 0) {
2554                         err = ret;
2555                         goto out;
2556                 } else {
2557                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2558                         len -= ret;
2559                         i++;
2560                 }
2561         }
2562
2563         if (!i || len > 0) {
2564                 err = -EINVAL;
2565                 goto out;
2566         }
2567
2568         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2569                             kma ? &k : NULL, net);
2570
2571  out:
2572         return err;
2573 }
2574 #else
2575 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2576                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2577 {
2578         return -ENOPROTOOPT;
2579 }
2580 #endif
2581
2582
2583 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2584 {
2585         struct net *net = sock_net(sk);
2586         unsigned int dir;
2587         int err = 0, delete;
2588         struct sadb_x_policy *pol;
2589         struct xfrm_policy *xp;
2590         struct km_event c;
2591
2592         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2593                 return -EINVAL;
2594
2595         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2596         if (dir >= XFRM_POLICY_MAX)
2597                 return -EINVAL;
2598
2599         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2600         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2601                               dir, pol->sadb_x_policy_id, delete, &err);
2602         if (xp == NULL)
2603                 return -ENOENT;
2604
2605         if (delete) {
2606                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2607                                 audit_get_loginuid(current),
2608                                 audit_get_sessionid(current), 0);
2609
2610                 if (err)
2611                         goto out;
2612                 c.seq = hdr->sadb_msg_seq;
2613                 c.portid = hdr->sadb_msg_pid;
2614                 c.data.byid = 1;
2615                 c.event = XFRM_MSG_DELPOLICY;
2616                 km_policy_notify(xp, dir, &c);
2617         } else {
2618                 err = key_pol_get_resp(sk, xp, hdr, dir);
2619         }
2620
2621 out:
2622         xfrm_pol_put(xp);
2623         if (delete && err == 0)
2624                 xfrm_garbage_collect(net);
2625         return err;
2626 }
2627
2628 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2629 {
2630         struct pfkey_sock *pfk = ptr;
2631         struct sk_buff *out_skb;
2632         struct sadb_msg *out_hdr;
2633         int err;
2634
2635         if (!pfkey_can_dump(&pfk->sk))
2636                 return -ENOBUFS;
2637
2638         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2639         if (IS_ERR(out_skb))
2640                 return PTR_ERR(out_skb);
2641
2642         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2643         if (err < 0)
2644                 return err;
2645
2646         out_hdr = (struct sadb_msg *) out_skb->data;
2647         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2648         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2649         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2650         out_hdr->sadb_msg_errno = 0;
2651         out_hdr->sadb_msg_seq = count + 1;
2652         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2653
2654         if (pfk->dump.skb)
2655                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2656                                 &pfk->sk, sock_net(&pfk->sk));
2657         pfk->dump.skb = out_skb;
2658
2659         return 0;
2660 }
2661
2662 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2663 {
2664         struct net *net = sock_net(&pfk->sk);
2665         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2666 }
2667
2668 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2669 {
2670         struct net *net = sock_net((struct sock *)pfk);
2671
2672         xfrm_policy_walk_done(&pfk->dump.u.policy, net);
2673 }
2674
2675 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2676 {
2677         struct pfkey_sock *pfk = pfkey_sk(sk);
2678
2679         if (pfk->dump.dump != NULL)
2680                 return -EBUSY;
2681
2682         pfk->dump.msg_version = hdr->sadb_msg_version;
2683         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2684         pfk->dump.dump = pfkey_dump_sp;
2685         pfk->dump.done = pfkey_dump_sp_done;
2686         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2687
2688         return pfkey_do_dump(pfk);
2689 }
2690
2691 static int key_notify_policy_flush(const struct km_event *c)
2692 {
2693         struct sk_buff *skb_out;
2694         struct sadb_msg *hdr;
2695
2696         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2697         if (!skb_out)
2698                 return -ENOBUFS;
2699         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2700         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2701         hdr->sadb_msg_seq = c->seq;
2702         hdr->sadb_msg_pid = c->portid;
2703         hdr->sadb_msg_version = PF_KEY_V2;
2704         hdr->sadb_msg_errno = (uint8_t) 0;
2705         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2706         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2707         hdr->sadb_msg_reserved = 0;
2708         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2709         return 0;
2710
2711 }
2712
2713 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2714 {
2715         struct net *net = sock_net(sk);
2716         struct km_event c;
2717         struct xfrm_audit audit_info;
2718         int err, err2;
2719
2720         audit_info.loginuid = audit_get_loginuid(current);
2721         audit_info.sessionid = audit_get_sessionid(current);
2722         audit_info.secid = 0;
2723         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2724         err2 = unicast_flush_resp(sk, hdr);
2725         if (err || err2) {
2726                 if (err == -ESRCH) /* empty table - old silent behavior */
2727                         return 0;
2728                 return err;
2729         }
2730
2731         c.data.type = XFRM_POLICY_TYPE_MAIN;
2732         c.event = XFRM_MSG_FLUSHPOLICY;
2733         c.portid = hdr->sadb_msg_pid;
2734         c.seq = hdr->sadb_msg_seq;
2735         c.net = net;
2736         km_policy_notify(NULL, 0, &c);
2737
2738         return 0;
2739 }
2740
2741 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2742                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2743 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2744         [SADB_RESERVED]         = pfkey_reserved,
2745         [SADB_GETSPI]           = pfkey_getspi,
2746         [SADB_UPDATE]           = pfkey_add,
2747         [SADB_ADD]              = pfkey_add,
2748         [SADB_DELETE]           = pfkey_delete,
2749         [SADB_GET]              = pfkey_get,
2750         [SADB_ACQUIRE]          = pfkey_acquire,
2751         [SADB_REGISTER]         = pfkey_register,
2752         [SADB_EXPIRE]           = NULL,
2753         [SADB_FLUSH]            = pfkey_flush,
2754         [SADB_DUMP]             = pfkey_dump,
2755         [SADB_X_PROMISC]        = pfkey_promisc,
2756         [SADB_X_PCHANGE]        = NULL,
2757         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2758         [SADB_X_SPDADD]         = pfkey_spdadd,
2759         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2760         [SADB_X_SPDGET]         = pfkey_spdget,
2761         [SADB_X_SPDACQUIRE]     = NULL,
2762         [SADB_X_SPDDUMP]        = pfkey_spddump,
2763         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2764         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2765         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2766         [SADB_X_MIGRATE]        = pfkey_migrate,
2767 };
2768
2769 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2770 {
2771         void *ext_hdrs[SADB_EXT_MAX];
2772         int err;
2773
2774         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2775                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2776
2777         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2778         err = parse_exthdrs(skb, hdr, ext_hdrs);
2779         if (!err) {
2780                 err = -EOPNOTSUPP;
2781                 if (pfkey_funcs[hdr->sadb_msg_type])
2782                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2783         }
2784         return err;
2785 }
2786
2787 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2788 {
2789         struct sadb_msg *hdr = NULL;
2790
2791         if (skb->len < sizeof(*hdr)) {
2792                 *errp = -EMSGSIZE;
2793         } else {
2794                 hdr = (struct sadb_msg *) skb->data;
2795                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2796                     hdr->sadb_msg_reserved != 0 ||
2797                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2798                      hdr->sadb_msg_type > SADB_MAX)) {
2799                         hdr = NULL;
2800                         *errp = -EINVAL;
2801                 } else if (hdr->sadb_msg_len != (skb->len /
2802                                                  sizeof(uint64_t)) ||
2803                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2804                                                 sizeof(uint64_t))) {
2805                         hdr = NULL;
2806                         *errp = -EMSGSIZE;
2807                 } else {
2808                         *errp = 0;
2809                 }
2810         }
2811         return hdr;
2812 }
2813
2814 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2815                                 const struct xfrm_algo_desc *d)
2816 {
2817         unsigned int id = d->desc.sadb_alg_id;
2818
2819         if (id >= sizeof(t->aalgos) * 8)
2820                 return 0;
2821
2822         return (t->aalgos >> id) & 1;
2823 }
2824
2825 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2826                                 const struct xfrm_algo_desc *d)
2827 {
2828         unsigned int id = d->desc.sadb_alg_id;
2829
2830         if (id >= sizeof(t->ealgos) * 8)
2831                 return 0;
2832
2833         return (t->ealgos >> id) & 1;
2834 }
2835
2836 static int count_ah_combs(const struct xfrm_tmpl *t)
2837 {
2838         int i, sz = 0;
2839
2840         for (i = 0; ; i++) {
2841                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2842                 if (!aalg)
2843                         break;
2844                 if (!aalg->pfkey_supported)
2845                         continue;
2846                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2847                         sz += sizeof(struct sadb_comb);
2848         }
2849         return sz + sizeof(struct sadb_prop);
2850 }
2851
2852 static int count_esp_combs(const struct xfrm_tmpl *t)
2853 {
2854         int i, k, sz = 0;
2855
2856         for (i = 0; ; i++) {
2857                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2858                 if (!ealg)
2859                         break;
2860
2861                 if (!ealg->pfkey_supported)
2862                         continue;
2863
2864                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2865                         continue;
2866
2867                 for (k = 1; ; k++) {
2868                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2869                         if (!aalg)
2870                                 break;
2871
2872                         if (!aalg->pfkey_supported)
2873                                 continue;
2874
2875                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2876                                 sz += sizeof(struct sadb_comb);
2877                 }
2878         }
2879         return sz + sizeof(struct sadb_prop);
2880 }
2881
2882 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2883 {
2884         struct sadb_prop *p;
2885         int i;
2886
2887         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2888         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2889         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2890         p->sadb_prop_replay = 32;
2891         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2892
2893         for (i = 0; ; i++) {
2894                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2895                 if (!aalg)
2896                         break;
2897
2898                 if (!aalg->pfkey_supported)
2899                         continue;
2900
2901                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2902                         struct sadb_comb *c;
2903                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2904                         memset(c, 0, sizeof(*c));
2905                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2906                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2907                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2908                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2909                         c->sadb_comb_hard_addtime = 24*60*60;
2910                         c->sadb_comb_soft_addtime = 20*60*60;
2911                         c->sadb_comb_hard_usetime = 8*60*60;
2912                         c->sadb_comb_soft_usetime = 7*60*60;
2913                 }
2914         }
2915 }
2916
2917 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2918 {
2919         struct sadb_prop *p;
2920         int i, k;
2921
2922         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2923         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2924         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2925         p->sadb_prop_replay = 32;
2926         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2927
2928         for (i=0; ; i++) {
2929                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2930                 if (!ealg)
2931                         break;
2932
2933                 if (!ealg->pfkey_supported)
2934                         continue;
2935
2936                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2937                         continue;
2938
2939                 for (k = 1; ; k++) {
2940                         struct sadb_comb *c;
2941                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2942                         if (!aalg)
2943                                 break;
2944                         if (!aalg->pfkey_supported)
2945                                 continue;
2946                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2947                                 continue;
2948                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2949                         memset(c, 0, sizeof(*c));
2950                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2951                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2952                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2953                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2954                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2955                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2956                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2957                         c->sadb_comb_hard_addtime = 24*60*60;
2958                         c->sadb_comb_soft_addtime = 20*60*60;
2959                         c->sadb_comb_hard_usetime = 8*60*60;
2960                         c->sadb_comb_soft_usetime = 7*60*60;
2961                 }
2962         }
2963 }
2964
2965 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2966 {
2967         return 0;
2968 }
2969
2970 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2971 {
2972         struct sk_buff *out_skb;
2973         struct sadb_msg *out_hdr;
2974         int hard;
2975         int hsc;
2976
2977         hard = c->data.hard;
2978         if (hard)
2979                 hsc = 2;
2980         else
2981                 hsc = 1;
2982
2983         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2984         if (IS_ERR(out_skb))
2985                 return PTR_ERR(out_skb);
2986
2987         out_hdr = (struct sadb_msg *) out_skb->data;
2988         out_hdr->sadb_msg_version = PF_KEY_V2;
2989         out_hdr->sadb_msg_type = SADB_EXPIRE;
2990         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2991         out_hdr->sadb_msg_errno = 0;
2992         out_hdr->sadb_msg_reserved = 0;
2993         out_hdr->sadb_msg_seq = 0;
2994         out_hdr->sadb_msg_pid = 0;
2995
2996         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2997         return 0;
2998 }
2999
3000 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3001 {
3002         struct net *net = x ? xs_net(x) : c->net;
3003         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3004
3005         if (atomic_read(&net_pfkey->socks_nr) == 0)
3006                 return 0;
3007
3008         switch (c->event) {
3009         case XFRM_MSG_EXPIRE:
3010                 return key_notify_sa_expire(x, c);
3011         case XFRM_MSG_DELSA:
3012         case XFRM_MSG_NEWSA:
3013         case XFRM_MSG_UPDSA:
3014                 return key_notify_sa(x, c);
3015         case XFRM_MSG_FLUSHSA:
3016                 return key_notify_sa_flush(c);
3017         case XFRM_MSG_NEWAE: /* not yet supported */
3018                 break;
3019         default:
3020                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3021                 break;
3022         }
3023
3024         return 0;
3025 }
3026
3027 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3028 {
3029         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3030                 return 0;
3031
3032         switch (c->event) {
3033         case XFRM_MSG_POLEXPIRE:
3034                 return key_notify_policy_expire(xp, c);
3035         case XFRM_MSG_DELPOLICY:
3036         case XFRM_MSG_NEWPOLICY:
3037         case XFRM_MSG_UPDPOLICY:
3038                 return key_notify_policy(xp, dir, c);
3039         case XFRM_MSG_FLUSHPOLICY:
3040                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3041                         break;
3042                 return key_notify_policy_flush(c);
3043         default:
3044                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3045                 break;
3046         }
3047
3048         return 0;
3049 }
3050
3051 static u32 get_acqseq(void)
3052 {
3053         u32 res;
3054         static atomic_t acqseq;
3055
3056         do {
3057                 res = atomic_inc_return(&acqseq);
3058         } while (!res);
3059         return res;
3060 }
3061
3062 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3063 {
3064         struct sk_buff *skb;
3065         struct sadb_msg *hdr;
3066         struct sadb_address *addr;
3067         struct sadb_x_policy *pol;
3068         int sockaddr_size;
3069         int size;
3070         struct sadb_x_sec_ctx *sec_ctx;
3071         struct xfrm_sec_ctx *xfrm_ctx;
3072         int ctx_size = 0;
3073
3074         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3075         if (!sockaddr_size)
3076                 return -EINVAL;
3077
3078         size = sizeof(struct sadb_msg) +
3079                 (sizeof(struct sadb_address) * 2) +
3080                 (sockaddr_size * 2) +
3081                 sizeof(struct sadb_x_policy);
3082
3083         if (x->id.proto == IPPROTO_AH)
3084                 size += count_ah_combs(t);
3085         else if (x->id.proto == IPPROTO_ESP)
3086                 size += count_esp_combs(t);
3087
3088         if ((xfrm_ctx = x->security)) {
3089                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3090                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3091         }
3092
3093         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3094         if (skb == NULL)
3095                 return -ENOMEM;
3096
3097         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3098         hdr->sadb_msg_version = PF_KEY_V2;
3099         hdr->sadb_msg_type = SADB_ACQUIRE;
3100         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3101         hdr->sadb_msg_len = size / sizeof(uint64_t);
3102         hdr->sadb_msg_errno = 0;
3103         hdr->sadb_msg_reserved = 0;
3104         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3105         hdr->sadb_msg_pid = 0;
3106
3107         /* src address */
3108         addr = (struct sadb_address*) skb_put(skb,
3109                                               sizeof(struct sadb_address)+sockaddr_size);
3110         addr->sadb_address_len =
3111                 (sizeof(struct sadb_address)+sockaddr_size)/
3112                         sizeof(uint64_t);
3113         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3114         addr->sadb_address_proto = 0;
3115         addr->sadb_address_reserved = 0;
3116         addr->sadb_address_prefixlen =
3117                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3118                                     (struct sockaddr *) (addr + 1),
3119                                     x->props.family);
3120         if (!addr->sadb_address_prefixlen)
3121                 BUG();
3122
3123         /* dst address */
3124         addr = (struct sadb_address*) skb_put(skb,
3125                                               sizeof(struct sadb_address)+sockaddr_size);
3126         addr->sadb_address_len =
3127                 (sizeof(struct sadb_address)+sockaddr_size)/
3128                         sizeof(uint64_t);
3129         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3130         addr->sadb_address_proto = 0;
3131         addr->sadb_address_reserved = 0;
3132         addr->sadb_address_prefixlen =
3133                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3134                                     (struct sockaddr *) (addr + 1),
3135                                     x->props.family);
3136         if (!addr->sadb_address_prefixlen)
3137                 BUG();
3138
3139         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3140         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3141         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3142         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3143         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3144         pol->sadb_x_policy_reserved = 0;
3145         pol->sadb_x_policy_id = xp->index;
3146         pol->sadb_x_policy_priority = xp->priority;
3147
3148         /* Set sadb_comb's. */
3149         if (x->id.proto == IPPROTO_AH)
3150                 dump_ah_combs(skb, t);
3151         else if (x->id.proto == IPPROTO_ESP)
3152                 dump_esp_combs(skb, t);
3153
3154         /* security context */
3155         if (xfrm_ctx) {
3156                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3157                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3158                 sec_ctx->sadb_x_sec_len =
3159                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3160                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3161                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3162                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3163                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3164                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3165                        xfrm_ctx->ctx_len);
3166         }
3167
3168         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3169 }
3170
3171 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3172                                                 u8 *data, int len, int *dir)
3173 {
3174         struct net *net = sock_net(sk);
3175         struct xfrm_policy *xp;
3176         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3177         struct sadb_x_sec_ctx *sec_ctx;
3178
3179         switch (sk->sk_family) {
3180         case AF_INET:
3181                 if (opt != IP_IPSEC_POLICY) {
3182                         *dir = -EOPNOTSUPP;
3183                         return NULL;
3184                 }
3185                 break;
3186 #if IS_ENABLED(CONFIG_IPV6)
3187         case AF_INET6:
3188                 if (opt != IPV6_IPSEC_POLICY) {
3189                         *dir = -EOPNOTSUPP;
3190                         return NULL;
3191                 }
3192                 break;
3193 #endif
3194         default:
3195                 *dir = -EINVAL;
3196                 return NULL;
3197         }
3198
3199         *dir = -EINVAL;
3200
3201         if (len < sizeof(struct sadb_x_policy) ||
3202             pol->sadb_x_policy_len*8 > len ||
3203             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3204             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3205                 return NULL;
3206
3207         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3208         if (xp == NULL) {
3209                 *dir = -ENOBUFS;
3210                 return NULL;
3211         }
3212
3213         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3214                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3215
3216         xp->lft.soft_byte_limit = XFRM_INF;
3217         xp->lft.hard_byte_limit = XFRM_INF;
3218         xp->lft.soft_packet_limit = XFRM_INF;
3219         xp->lft.hard_packet_limit = XFRM_INF;
3220         xp->family = sk->sk_family;
3221
3222         xp->xfrm_nr = 0;
3223         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3224             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3225                 goto out;
3226
3227         /* security context too */
3228         if (len >= (pol->sadb_x_policy_len*8 +
3229             sizeof(struct sadb_x_sec_ctx))) {
3230                 char *p = (char *)pol;
3231                 struct xfrm_user_sec_ctx *uctx;
3232
3233                 p += pol->sadb_x_policy_len*8;
3234                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3235                 if (len < pol->sadb_x_policy_len*8 +
3236                     sec_ctx->sadb_x_sec_len) {
3237                         *dir = -EINVAL;
3238                         goto out;
3239                 }
3240                 if ((*dir = verify_sec_ctx_len(p)))
3241                         goto out;
3242                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3243                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3244                 kfree(uctx);
3245
3246                 if (*dir)
3247                         goto out;
3248         }
3249
3250         *dir = pol->sadb_x_policy_dir-1;
3251         return xp;
3252
3253 out:
3254         xp->walk.dead = 1;
3255         xfrm_policy_destroy(xp);
3256         return NULL;
3257 }
3258
3259 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3260 {
3261         struct sk_buff *skb;
3262         struct sadb_msg *hdr;
3263         struct sadb_sa *sa;
3264         struct sadb_address *addr;
3265         struct sadb_x_nat_t_port *n_port;
3266         int sockaddr_size;
3267         int size;
3268         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3269         struct xfrm_encap_tmpl *natt = NULL;
3270
3271         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3272         if (!sockaddr_size)
3273                 return -EINVAL;
3274
3275         if (!satype)
3276                 return -EINVAL;
3277
3278         if (!x->encap)
3279                 return -EINVAL;
3280
3281         natt = x->encap;
3282
3283         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3284          *
3285          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3286          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3287          */
3288
3289         size = sizeof(struct sadb_msg) +
3290                 sizeof(struct sadb_sa) +
3291                 (sizeof(struct sadb_address) * 2) +
3292                 (sockaddr_size * 2) +
3293                 (sizeof(struct sadb_x_nat_t_port) * 2);
3294
3295         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3296         if (skb == NULL)
3297                 return -ENOMEM;
3298
3299         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3300         hdr->sadb_msg_version = PF_KEY_V2;
3301         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3302         hdr->sadb_msg_satype = satype;
3303         hdr->sadb_msg_len = size / sizeof(uint64_t);
3304         hdr->sadb_msg_errno = 0;
3305         hdr->sadb_msg_reserved = 0;
3306         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3307         hdr->sadb_msg_pid = 0;
3308
3309         /* SA */
3310         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3311         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3312         sa->sadb_sa_exttype = SADB_EXT_SA;
3313         sa->sadb_sa_spi = x->id.spi;
3314         sa->sadb_sa_replay = 0;
3315         sa->sadb_sa_state = 0;
3316         sa->sadb_sa_auth = 0;
3317         sa->sadb_sa_encrypt = 0;
3318         sa->sadb_sa_flags = 0;
3319
3320         /* ADDRESS_SRC (old addr) */
3321         addr = (struct sadb_address*)
3322                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3323         addr->sadb_address_len =
3324                 (sizeof(struct sadb_address)+sockaddr_size)/
3325                         sizeof(uint64_t);
3326         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3327         addr->sadb_address_proto = 0;
3328         addr->sadb_address_reserved = 0;
3329         addr->sadb_address_prefixlen =
3330                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3331                                     (struct sockaddr *) (addr + 1),
3332                                     x->props.family);
3333         if (!addr->sadb_address_prefixlen)
3334                 BUG();
3335
3336         /* NAT_T_SPORT (old port) */
3337         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3338         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3339         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3340         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3341         n_port->sadb_x_nat_t_port_reserved = 0;
3342
3343         /* ADDRESS_DST (new addr) */
3344         addr = (struct sadb_address*)
3345                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3346         addr->sadb_address_len =
3347                 (sizeof(struct sadb_address)+sockaddr_size)/
3348                         sizeof(uint64_t);
3349         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3350         addr->sadb_address_proto = 0;
3351         addr->sadb_address_reserved = 0;
3352         addr->sadb_address_prefixlen =
3353                 pfkey_sockaddr_fill(ipaddr, 0,
3354                                     (struct sockaddr *) (addr + 1),
3355                                     x->props.family);
3356         if (!addr->sadb_address_prefixlen)
3357                 BUG();
3358
3359         /* NAT_T_DPORT (new port) */
3360         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3361         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3362         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3363         n_port->sadb_x_nat_t_port_port = sport;
3364         n_port->sadb_x_nat_t_port_reserved = 0;
3365
3366         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3367 }
3368
3369 #ifdef CONFIG_NET_KEY_MIGRATE
3370 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3371                             const struct xfrm_selector *sel)
3372 {
3373         struct sadb_address *addr;
3374         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3375         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3376         addr->sadb_address_exttype = type;
3377         addr->sadb_address_proto = sel->proto;
3378         addr->sadb_address_reserved = 0;
3379
3380         switch (type) {
3381         case SADB_EXT_ADDRESS_SRC:
3382                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3383                 pfkey_sockaddr_fill(&sel->saddr, 0,
3384                                     (struct sockaddr *)(addr + 1),
3385                                     sel->family);
3386                 break;
3387         case SADB_EXT_ADDRESS_DST:
3388                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3389                 pfkey_sockaddr_fill(&sel->daddr, 0,
3390                                     (struct sockaddr *)(addr + 1),
3391                                     sel->family);
3392                 break;
3393         default:
3394                 return -EINVAL;
3395         }
3396
3397         return 0;
3398 }
3399
3400
3401 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3402 {
3403         struct sadb_x_kmaddress *kma;
3404         u8 *sa;
3405         int family = k->family;
3406         int socklen = pfkey_sockaddr_len(family);
3407         int size_req;
3408
3409         size_req = (sizeof(struct sadb_x_kmaddress) +
3410                     pfkey_sockaddr_pair_size(family));
3411
3412         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3413         memset(kma, 0, size_req);
3414         kma->sadb_x_kmaddress_len = size_req / 8;
3415         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3416         kma->sadb_x_kmaddress_reserved = k->reserved;
3417
3418         sa = (u8 *)(kma + 1);
3419         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3420             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3421                 return -EINVAL;
3422
3423         return 0;
3424 }
3425
3426 static int set_ipsecrequest(struct sk_buff *skb,
3427                             uint8_t proto, uint8_t mode, int level,
3428                             uint32_t reqid, uint8_t family,
3429                             const xfrm_address_t *src, const xfrm_address_t *dst)
3430 {
3431         struct sadb_x_ipsecrequest *rq;
3432         u8 *sa;
3433         int socklen = pfkey_sockaddr_len(family);
3434         int size_req;
3435
3436         size_req = sizeof(struct sadb_x_ipsecrequest) +
3437                    pfkey_sockaddr_pair_size(family);
3438
3439         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3440         memset(rq, 0, size_req);
3441         rq->sadb_x_ipsecrequest_len = size_req;
3442         rq->sadb_x_ipsecrequest_proto = proto;
3443         rq->sadb_x_ipsecrequest_mode = mode;
3444         rq->sadb_x_ipsecrequest_level = level;
3445         rq->sadb_x_ipsecrequest_reqid = reqid;
3446
3447         sa = (u8 *) (rq + 1);
3448         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3449             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3450                 return -EINVAL;
3451
3452         return 0;
3453 }
3454 #endif
3455
3456 #ifdef CONFIG_NET_KEY_MIGRATE
3457 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3458                               const struct xfrm_migrate *m, int num_bundles,
3459                               const struct xfrm_kmaddress *k)
3460 {
3461         int i;
3462         int sasize_sel;
3463         int size = 0;
3464         int size_pol = 0;
3465         struct sk_buff *skb;
3466         struct sadb_msg *hdr;
3467         struct sadb_x_policy *pol;
3468         const struct xfrm_migrate *mp;
3469
3470         if (type != XFRM_POLICY_TYPE_MAIN)
3471                 return 0;
3472
3473         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3474                 return -EINVAL;
3475
3476         if (k != NULL) {
3477                 /* addresses for KM */
3478                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3479                                      pfkey_sockaddr_pair_size(k->family));
3480         }
3481
3482         /* selector */
3483         sasize_sel = pfkey_sockaddr_size(sel->family);
3484         if (!sasize_sel)
3485                 return -EINVAL;
3486         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3487
3488         /* policy info */
3489         size_pol += sizeof(struct sadb_x_policy);
3490
3491         /* ipsecrequests */
3492         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3493                 /* old locator pair */
3494                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3495                             pfkey_sockaddr_pair_size(mp->old_family);
3496                 /* new locator pair */
3497                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3498                             pfkey_sockaddr_pair_size(mp->new_family);
3499         }
3500
3501         size += sizeof(struct sadb_msg) + size_pol;
3502
3503         /* alloc buffer */
3504         skb = alloc_skb(size, GFP_ATOMIC);
3505         if (skb == NULL)
3506                 return -ENOMEM;
3507
3508         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3509         hdr->sadb_msg_version = PF_KEY_V2;
3510         hdr->sadb_msg_type = SADB_X_MIGRATE;
3511         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3512         hdr->sadb_msg_len = size / 8;
3513         hdr->sadb_msg_errno = 0;
3514         hdr->sadb_msg_reserved = 0;
3515         hdr->sadb_msg_seq = 0;
3516         hdr->sadb_msg_pid = 0;
3517
3518         /* Addresses to be used by KM for negotiation, if ext is available */
3519         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3520                 goto err;
3521
3522         /* selector src */
3523         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3524
3525         /* selector dst */
3526         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3527
3528         /* policy information */
3529         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3530         pol->sadb_x_policy_len = size_pol / 8;
3531         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3532         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3533         pol->sadb_x_policy_dir = dir + 1;
3534         pol->sadb_x_policy_reserved = 0;
3535         pol->sadb_x_policy_id = 0;
3536         pol->sadb_x_policy_priority = 0;
3537
3538         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3539                 /* old ipsecrequest */
3540                 int mode = pfkey_mode_from_xfrm(mp->mode);
3541                 if (mode < 0)
3542                         goto err;
3543                 if (set_ipsecrequest(skb, mp->proto, mode,
3544                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3545                                      mp->reqid, mp->old_family,
3546                                      &mp->old_saddr, &mp->old_daddr) < 0)
3547                         goto err;
3548
3549                 /* new ipsecrequest */
3550                 if (set_ipsecrequest(skb, mp->proto, mode,
3551                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3552                                      mp->reqid, mp->new_family,
3553                                      &mp->new_saddr, &mp->new_daddr) < 0)
3554                         goto err;
3555         }
3556
3557         /* broadcast migrate message to sockets */
3558         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3559
3560         return 0;
3561
3562 err:
3563         kfree_skb(skb);
3564         return -EINVAL;
3565 }
3566 #else
3567 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3568                               const struct xfrm_migrate *m, int num_bundles,
3569                               const struct xfrm_kmaddress *k)
3570 {
3571         return -ENOPROTOOPT;
3572 }
3573 #endif
3574
3575 static int pfkey_sendmsg(struct kiocb *kiocb,
3576                          struct socket *sock, struct msghdr *msg, size_t len)
3577 {
3578         struct sock *sk = sock->sk;
3579         struct sk_buff *skb = NULL;
3580         struct sadb_msg *hdr = NULL;
3581         int err;
3582         struct net *net = sock_net(sk);
3583
3584         err = -EOPNOTSUPP;
3585         if (msg->msg_flags & MSG_OOB)
3586                 goto out;
3587
3588         err = -EMSGSIZE;
3589         if ((unsigned int)len > sk->sk_sndbuf - 32)
3590                 goto out;
3591
3592         err = -ENOBUFS;
3593         skb = alloc_skb(len, GFP_KERNEL);
3594         if (skb == NULL)
3595                 goto out;
3596
3597         err = -EFAULT;
3598         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3599                 goto out;
3600
3601         hdr = pfkey_get_base_msg(skb, &err);
3602         if (!hdr)
3603                 goto out;
3604
3605         mutex_lock(&net->xfrm.xfrm_cfg_mutex);
3606         err = pfkey_process(sk, skb, hdr);
3607         mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
3608
3609 out:
3610         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3611                 err = 0;
3612         kfree_skb(skb);
3613
3614         return err ? : len;
3615 }
3616
3617 static int pfkey_recvmsg(struct kiocb *kiocb,
3618                          struct socket *sock, struct msghdr *msg, size_t len,
3619                          int flags)
3620 {
3621         struct sock *sk = sock->sk;
3622         struct pfkey_sock *pfk = pfkey_sk(sk);
3623         struct sk_buff *skb;
3624         int copied, err;
3625
3626         err = -EINVAL;
3627         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3628                 goto out;
3629
3630         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3631         if (skb == NULL)
3632                 goto out;
3633
3634         copied = skb->len;
3635         if (copied > len) {
3636                 msg->msg_flags |= MSG_TRUNC;
3637                 copied = len;
3638         }
3639
3640         skb_reset_transport_header(skb);
3641         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3642         if (err)
3643                 goto out_free;
3644
3645         sock_recv_ts_and_drops(msg, sk, skb);
3646
3647         err = (flags & MSG_TRUNC) ? skb->len : copied;
3648
3649         if (pfk->dump.dump != NULL &&
3650             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3651                 pfkey_do_dump(pfk);
3652
3653 out_free:
3654         skb_free_datagram(sk, skb);
3655 out:
3656         return err;
3657 }
3658
3659 static const struct proto_ops pfkey_ops = {
3660         .family         =       PF_KEY,
3661         .owner          =       THIS_MODULE,
3662         /* Operations that make no sense on pfkey sockets. */
3663         .bind           =       sock_no_bind,
3664         .connect        =       sock_no_connect,
3665         .socketpair     =       sock_no_socketpair,
3666         .accept         =       sock_no_accept,
3667         .getname        =       sock_no_getname,
3668         .ioctl          =       sock_no_ioctl,
3669         .listen         =       sock_no_listen,
3670         .shutdown       =       sock_no_shutdown,
3671         .setsockopt     =       sock_no_setsockopt,
3672         .getsockopt     =       sock_no_getsockopt,
3673         .mmap           =       sock_no_mmap,
3674         .sendpage       =       sock_no_sendpage,
3675
3676         /* Now the operations that really occur. */
3677         .release        =       pfkey_release,
3678         .poll           =       datagram_poll,
3679         .sendmsg        =       pfkey_sendmsg,
3680         .recvmsg        =       pfkey_recvmsg,
3681 };
3682
3683 static const struct net_proto_family pfkey_family_ops = {
3684         .family =       PF_KEY,
3685         .create =       pfkey_create,
3686         .owner  =       THIS_MODULE,
3687 };
3688
3689 #ifdef CONFIG_PROC_FS
3690 static int pfkey_seq_show(struct seq_file *f, void *v)
3691 {
3692         struct sock *s = sk_entry(v);
3693
3694         if (v == SEQ_START_TOKEN)
3695                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3696         else
3697                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3698                                s,
3699                                atomic_read(&s->sk_refcnt),
3700                                sk_rmem_alloc_get(s),
3701                                sk_wmem_alloc_get(s),
3702                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3703                                sock_i_ino(s)
3704                                );
3705         return 0;
3706 }
3707
3708 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3709         __acquires(rcu)
3710 {
3711         struct net *net = seq_file_net(f);
3712         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3713
3714         rcu_read_lock();
3715         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3716 }
3717
3718 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3719 {
3720         struct net *net = seq_file_net(f);
3721         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3722
3723         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3724 }
3725
3726 static void pfkey_seq_stop(struct seq_file *f, void *v)
3727         __releases(rcu)
3728 {
3729         rcu_read_unlock();
3730 }
3731
3732 static const struct seq_operations pfkey_seq_ops = {
3733         .start  = pfkey_seq_start,
3734         .next   = pfkey_seq_next,
3735         .stop   = pfkey_seq_stop,
3736         .show   = pfkey_seq_show,
3737 };
3738
3739 static int pfkey_seq_open(struct inode *inode, struct file *file)
3740 {
3741         return seq_open_net(inode, file, &pfkey_seq_ops,
3742                             sizeof(struct seq_net_private));
3743 }
3744
3745 static const struct file_operations pfkey_proc_ops = {
3746         .open    = pfkey_seq_open,
3747         .read    = seq_read,
3748         .llseek  = seq_lseek,
3749         .release = seq_release_net,
3750 };
3751
3752 static int __net_init pfkey_init_proc(struct net *net)
3753 {
3754         struct proc_dir_entry *e;
3755
3756         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3757         if (e == NULL)
3758                 return -ENOMEM;
3759
3760         return 0;
3761 }
3762
3763 static void __net_exit pfkey_exit_proc(struct net *net)
3764 {
3765         remove_proc_entry("pfkey", net->proc_net);
3766 }
3767 #else
3768 static inline int pfkey_init_proc(struct net *net)
3769 {
3770         return 0;
3771 }
3772
3773 static inline void pfkey_exit_proc(struct net *net)
3774 {
3775 }
3776 #endif
3777
3778 static struct xfrm_mgr pfkeyv2_mgr =
3779 {
3780         .id             = "pfkeyv2",
3781         .notify         = pfkey_send_notify,
3782         .acquire        = pfkey_send_acquire,
3783         .compile_policy = pfkey_compile_policy,
3784         .new_mapping    = pfkey_send_new_mapping,
3785         .notify_policy  = pfkey_send_policy_notify,
3786         .migrate        = pfkey_send_migrate,
3787 };
3788
3789 static int __net_init pfkey_net_init(struct net *net)
3790 {
3791         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3792         int rv;
3793
3794         INIT_HLIST_HEAD(&net_pfkey->table);
3795         atomic_set(&net_pfkey->socks_nr, 0);
3796
3797         rv = pfkey_init_proc(net);
3798
3799         return rv;
3800 }
3801
3802 static void __net_exit pfkey_net_exit(struct net *net)
3803 {
3804         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3805
3806         pfkey_exit_proc(net);
3807         BUG_ON(!hlist_empty(&net_pfkey->table));
3808 }
3809
3810 static struct pernet_operations pfkey_net_ops = {
3811         .init = pfkey_net_init,
3812         .exit = pfkey_net_exit,
3813         .id   = &pfkey_net_id,
3814         .size = sizeof(struct netns_pfkey),
3815 };
3816
3817 static void __exit ipsec_pfkey_exit(void)
3818 {
3819         xfrm_unregister_km(&pfkeyv2_mgr);
3820         sock_unregister(PF_KEY);
3821         unregister_pernet_subsys(&pfkey_net_ops);
3822         proto_unregister(&key_proto);
3823 }
3824
3825 static int __init ipsec_pfkey_init(void)
3826 {
3827         int err = proto_register(&key_proto, 0);
3828
3829         if (err != 0)
3830                 goto out;
3831
3832         err = register_pernet_subsys(&pfkey_net_ops);
3833         if (err != 0)
3834                 goto out_unregister_key_proto;
3835         err = sock_register(&pfkey_family_ops);
3836         if (err != 0)
3837                 goto out_unregister_pernet;
3838         err = xfrm_register_km(&pfkeyv2_mgr);
3839         if (err != 0)
3840                 goto out_sock_unregister;
3841 out:
3842         return err;
3843
3844 out_sock_unregister:
3845         sock_unregister(PF_KEY);
3846 out_unregister_pernet:
3847         unregister_pernet_subsys(&pfkey_net_ops);
3848 out_unregister_key_proto:
3849         proto_unregister(&key_proto);
3850         goto out;
3851 }
3852
3853 module_init(ipsec_pfkey_init);
3854 module_exit(ipsec_pfkey_exit);
3855 MODULE_LICENSE("GPL");
3856 MODULE_ALIAS_NETPROTO(PF_KEY);