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 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 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 = sa->sadb_sa_replay;
1102         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1103                 x->props.flags |= XFRM_STATE_NOECN;
1104         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1105                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1106         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1107                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1108
1109         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1110         if (lifetime != NULL) {
1111                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1112                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1113                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1114                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1115         }
1116         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1117         if (lifetime != NULL) {
1118                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1119                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1120                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1121                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1122         }
1123
1124         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1125         if (sec_ctx != NULL) {
1126                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1127
1128                 if (!uctx)
1129                         goto out;
1130
1131                 err = security_xfrm_state_alloc(x, uctx);
1132                 kfree(uctx);
1133
1134                 if (err)
1135                         goto out;
1136         }
1137
1138         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1139         if (sa->sadb_sa_auth) {
1140                 int keysize = 0;
1141                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1142                 if (!a || !a->pfkey_supported) {
1143                         err = -ENOSYS;
1144                         goto out;
1145                 }
1146                 if (key)
1147                         keysize = (key->sadb_key_bits + 7) / 8;
1148                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1149                 if (!x->aalg)
1150                         goto out;
1151                 strcpy(x->aalg->alg_name, a->name);
1152                 x->aalg->alg_key_len = 0;
1153                 if (key) {
1154                         x->aalg->alg_key_len = key->sadb_key_bits;
1155                         memcpy(x->aalg->alg_key, key+1, keysize);
1156                 }
1157                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1158                 x->props.aalgo = sa->sadb_sa_auth;
1159                 /* x->algo.flags = sa->sadb_sa_flags; */
1160         }
1161         if (sa->sadb_sa_encrypt) {
1162                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1163                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1164                         if (!a || !a->pfkey_supported) {
1165                                 err = -ENOSYS;
1166                                 goto out;
1167                         }
1168                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1169                         if (!x->calg)
1170                                 goto out;
1171                         strcpy(x->calg->alg_name, a->name);
1172                         x->props.calgo = sa->sadb_sa_encrypt;
1173                 } else {
1174                         int keysize = 0;
1175                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1176                         if (!a || !a->pfkey_supported) {
1177                                 err = -ENOSYS;
1178                                 goto out;
1179                         }
1180                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1181                         if (key)
1182                                 keysize = (key->sadb_key_bits + 7) / 8;
1183                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1184                         if (!x->ealg)
1185                                 goto out;
1186                         strcpy(x->ealg->alg_name, a->name);
1187                         x->ealg->alg_key_len = 0;
1188                         if (key) {
1189                                 x->ealg->alg_key_len = key->sadb_key_bits;
1190                                 memcpy(x->ealg->alg_key, key+1, keysize);
1191                         }
1192                         x->props.ealgo = sa->sadb_sa_encrypt;
1193                 }
1194         }
1195         /* x->algo.flags = sa->sadb_sa_flags; */
1196
1197         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1198                                                     &x->props.saddr);
1199         if (!x->props.family) {
1200                 err = -EAFNOSUPPORT;
1201                 goto out;
1202         }
1203         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1204                                   &x->id.daddr);
1205
1206         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1207                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1208                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1209                 if (mode < 0) {
1210                         err = -EINVAL;
1211                         goto out;
1212                 }
1213                 x->props.mode = mode;
1214                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1215         }
1216
1217         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1218                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1219
1220                 /* Nobody uses this, but we try. */
1221                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1222                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1223         }
1224
1225         if (!x->sel.family)
1226                 x->sel.family = x->props.family;
1227
1228         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1229                 const struct sadb_x_nat_t_type* n_type;
1230                 struct xfrm_encap_tmpl *natt;
1231
1232                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1233                 if (!x->encap)
1234                         goto out;
1235
1236                 natt = x->encap;
1237                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1238                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1239
1240                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1241                         const struct sadb_x_nat_t_port *n_port =
1242                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1243                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1244                 }
1245                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1246                         const struct sadb_x_nat_t_port *n_port =
1247                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1248                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1249                 }
1250                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1251         }
1252
1253         err = xfrm_init_state(x);
1254         if (err)
1255                 goto out;
1256
1257         x->km.seq = hdr->sadb_msg_seq;
1258         return x;
1259
1260 out:
1261         x->km.state = XFRM_STATE_DEAD;
1262         xfrm_state_put(x);
1263         return ERR_PTR(err);
1264 }
1265
1266 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1267 {
1268         return -EOPNOTSUPP;
1269 }
1270
1271 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1272 {
1273         struct net *net = sock_net(sk);
1274         struct sk_buff *resp_skb;
1275         struct sadb_x_sa2 *sa2;
1276         struct sadb_address *saddr, *daddr;
1277         struct sadb_msg *out_hdr;
1278         struct sadb_spirange *range;
1279         struct xfrm_state *x = NULL;
1280         int mode;
1281         int err;
1282         u32 min_spi, max_spi;
1283         u32 reqid;
1284         u8 proto;
1285         unsigned short family;
1286         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1287
1288         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1289                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1290                 return -EINVAL;
1291
1292         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1293         if (proto == 0)
1294                 return -EINVAL;
1295
1296         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1297                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1298                 if (mode < 0)
1299                         return -EINVAL;
1300                 reqid = sa2->sadb_x_sa2_reqid;
1301         } else {
1302                 mode = 0;
1303                 reqid = 0;
1304         }
1305
1306         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1307         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1308
1309         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1310         switch (family) {
1311         case AF_INET:
1312                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1313                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1314                 break;
1315 #if IS_ENABLED(CONFIG_IPV6)
1316         case AF_INET6:
1317                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1318                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1319                 break;
1320 #endif
1321         }
1322
1323         if (hdr->sadb_msg_seq) {
1324                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1325                 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) {
1326                         xfrm_state_put(x);
1327                         x = NULL;
1328                 }
1329         }
1330
1331         if (!x)
1332                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1333
1334         if (x == NULL)
1335                 return -ENOENT;
1336
1337         min_spi = 0x100;
1338         max_spi = 0x0fffffff;
1339
1340         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1341         if (range) {
1342                 min_spi = range->sadb_spirange_min;
1343                 max_spi = range->sadb_spirange_max;
1344         }
1345
1346         err = xfrm_alloc_spi(x, min_spi, max_spi);
1347         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1348
1349         if (IS_ERR(resp_skb)) {
1350                 xfrm_state_put(x);
1351                 return  PTR_ERR(resp_skb);
1352         }
1353
1354         out_hdr = (struct sadb_msg *) resp_skb->data;
1355         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1356         out_hdr->sadb_msg_type = SADB_GETSPI;
1357         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1358         out_hdr->sadb_msg_errno = 0;
1359         out_hdr->sadb_msg_reserved = 0;
1360         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1361         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1362
1363         xfrm_state_put(x);
1364
1365         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1366
1367         return 0;
1368 }
1369
1370 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1371 {
1372         struct net *net = sock_net(sk);
1373         struct xfrm_state *x;
1374
1375         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1376                 return -EOPNOTSUPP;
1377
1378         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1379                 return 0;
1380
1381         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1382         if (x == NULL)
1383                 return 0;
1384
1385         spin_lock_bh(&x->lock);
1386         if (x->km.state == XFRM_STATE_ACQ) {
1387                 x->km.state = XFRM_STATE_ERROR;
1388                 wake_up(&net->xfrm.km_waitq);
1389         }
1390         spin_unlock_bh(&x->lock);
1391         xfrm_state_put(x);
1392         return 0;
1393 }
1394
1395 static inline int event2poltype(int event)
1396 {
1397         switch (event) {
1398         case XFRM_MSG_DELPOLICY:
1399                 return SADB_X_SPDDELETE;
1400         case XFRM_MSG_NEWPOLICY:
1401                 return SADB_X_SPDADD;
1402         case XFRM_MSG_UPDPOLICY:
1403                 return SADB_X_SPDUPDATE;
1404         case XFRM_MSG_POLEXPIRE:
1405         //      return SADB_X_SPDEXPIRE;
1406         default:
1407                 pr_err("pfkey: Unknown policy event %d\n", event);
1408                 break;
1409         }
1410
1411         return 0;
1412 }
1413
1414 static inline int event2keytype(int event)
1415 {
1416         switch (event) {
1417         case XFRM_MSG_DELSA:
1418                 return SADB_DELETE;
1419         case XFRM_MSG_NEWSA:
1420                 return SADB_ADD;
1421         case XFRM_MSG_UPDSA:
1422                 return SADB_UPDATE;
1423         case XFRM_MSG_EXPIRE:
1424                 return SADB_EXPIRE;
1425         default:
1426                 pr_err("pfkey: Unknown SA event %d\n", event);
1427                 break;
1428         }
1429
1430         return 0;
1431 }
1432
1433 /* ADD/UPD/DEL */
1434 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1435 {
1436         struct sk_buff *skb;
1437         struct sadb_msg *hdr;
1438
1439         skb = pfkey_xfrm_state2msg(x);
1440
1441         if (IS_ERR(skb))
1442                 return PTR_ERR(skb);
1443
1444         hdr = (struct sadb_msg *) skb->data;
1445         hdr->sadb_msg_version = PF_KEY_V2;
1446         hdr->sadb_msg_type = event2keytype(c->event);
1447         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1448         hdr->sadb_msg_errno = 0;
1449         hdr->sadb_msg_reserved = 0;
1450         hdr->sadb_msg_seq = c->seq;
1451         hdr->sadb_msg_pid = c->portid;
1452
1453         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1454
1455         return 0;
1456 }
1457
1458 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1459 {
1460         struct net *net = sock_net(sk);
1461         struct xfrm_state *x;
1462         int err;
1463         struct km_event c;
1464
1465         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1466         if (IS_ERR(x))
1467                 return PTR_ERR(x);
1468
1469         xfrm_state_hold(x);
1470         if (hdr->sadb_msg_type == SADB_ADD)
1471                 err = xfrm_state_add(x);
1472         else
1473                 err = xfrm_state_update(x);
1474
1475         xfrm_audit_state_add(x, err ? 0 : 1,
1476                              audit_get_loginuid(current),
1477                              audit_get_sessionid(current), 0);
1478
1479         if (err < 0) {
1480                 x->km.state = XFRM_STATE_DEAD;
1481                 __xfrm_state_put(x);
1482                 goto out;
1483         }
1484
1485         if (hdr->sadb_msg_type == SADB_ADD)
1486                 c.event = XFRM_MSG_NEWSA;
1487         else
1488                 c.event = XFRM_MSG_UPDSA;
1489         c.seq = hdr->sadb_msg_seq;
1490         c.portid = hdr->sadb_msg_pid;
1491         km_state_notify(x, &c);
1492 out:
1493         xfrm_state_put(x);
1494         return err;
1495 }
1496
1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1498 {
1499         struct net *net = sock_net(sk);
1500         struct xfrm_state *x;
1501         struct km_event c;
1502         int err;
1503
1504         if (!ext_hdrs[SADB_EXT_SA-1] ||
1505             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1506                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1507                 return -EINVAL;
1508
1509         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1510         if (x == NULL)
1511                 return -ESRCH;
1512
1513         if ((err = security_xfrm_state_delete(x)))
1514                 goto out;
1515
1516         if (xfrm_state_kern(x)) {
1517                 err = -EPERM;
1518                 goto out;
1519         }
1520
1521         err = xfrm_state_delete(x);
1522
1523         if (err < 0)
1524                 goto out;
1525
1526         c.seq = hdr->sadb_msg_seq;
1527         c.portid = hdr->sadb_msg_pid;
1528         c.event = XFRM_MSG_DELSA;
1529         km_state_notify(x, &c);
1530 out:
1531         xfrm_audit_state_delete(x, err ? 0 : 1,
1532                                 audit_get_loginuid(current),
1533                                 audit_get_sessionid(current), 0);
1534         xfrm_state_put(x);
1535
1536         return err;
1537 }
1538
1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1540 {
1541         struct net *net = sock_net(sk);
1542         __u8 proto;
1543         struct sk_buff *out_skb;
1544         struct sadb_msg *out_hdr;
1545         struct xfrm_state *x;
1546
1547         if (!ext_hdrs[SADB_EXT_SA-1] ||
1548             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1549                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1550                 return -EINVAL;
1551
1552         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1553         if (x == NULL)
1554                 return -ESRCH;
1555
1556         out_skb = pfkey_xfrm_state2msg(x);
1557         proto = x->id.proto;
1558         xfrm_state_put(x);
1559         if (IS_ERR(out_skb))
1560                 return  PTR_ERR(out_skb);
1561
1562         out_hdr = (struct sadb_msg *) out_skb->data;
1563         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1564         out_hdr->sadb_msg_type = SADB_GET;
1565         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1566         out_hdr->sadb_msg_errno = 0;
1567         out_hdr->sadb_msg_reserved = 0;
1568         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1569         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1570         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1571
1572         return 0;
1573 }
1574
1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1576                                               gfp_t allocation)
1577 {
1578         struct sk_buff *skb;
1579         struct sadb_msg *hdr;
1580         int len, auth_len, enc_len, i;
1581
1582         auth_len = xfrm_count_pfkey_auth_supported();
1583         if (auth_len) {
1584                 auth_len *= sizeof(struct sadb_alg);
1585                 auth_len += sizeof(struct sadb_supported);
1586         }
1587
1588         enc_len = xfrm_count_pfkey_enc_supported();
1589         if (enc_len) {
1590                 enc_len *= sizeof(struct sadb_alg);
1591                 enc_len += sizeof(struct sadb_supported);
1592         }
1593
1594         len = enc_len + auth_len + sizeof(struct sadb_msg);
1595
1596         skb = alloc_skb(len + 16, allocation);
1597         if (!skb)
1598                 goto out_put_algs;
1599
1600         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1601         pfkey_hdr_dup(hdr, orig);
1602         hdr->sadb_msg_errno = 0;
1603         hdr->sadb_msg_len = len / sizeof(uint64_t);
1604
1605         if (auth_len) {
1606                 struct sadb_supported *sp;
1607                 struct sadb_alg *ap;
1608
1609                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1610                 ap = (struct sadb_alg *) (sp + 1);
1611
1612                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1613                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1614
1615                 for (i = 0; ; i++) {
1616                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1617                         if (!aalg)
1618                                 break;
1619                         if (!aalg->pfkey_supported)
1620                                 continue;
1621                         if (aalg->available)
1622                                 *ap++ = aalg->desc;
1623                 }
1624         }
1625
1626         if (enc_len) {
1627                 struct sadb_supported *sp;
1628                 struct sadb_alg *ap;
1629
1630                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1631                 ap = (struct sadb_alg *) (sp + 1);
1632
1633                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1634                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1635
1636                 for (i = 0; ; i++) {
1637                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1638                         if (!ealg)
1639                                 break;
1640                         if (!ealg->pfkey_supported)
1641                                 continue;
1642                         if (ealg->available)
1643                                 *ap++ = ealg->desc;
1644                 }
1645         }
1646
1647 out_put_algs:
1648         return skb;
1649 }
1650
1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1652 {
1653         struct pfkey_sock *pfk = pfkey_sk(sk);
1654         struct sk_buff *supp_skb;
1655
1656         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1657                 return -EINVAL;
1658
1659         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1660                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1661                         return -EEXIST;
1662                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1663         }
1664
1665         xfrm_probe_algs();
1666
1667         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1668         if (!supp_skb) {
1669                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1670                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1671
1672                 return -ENOBUFS;
1673         }
1674
1675         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1676
1677         return 0;
1678 }
1679
1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1681 {
1682         struct sk_buff *skb;
1683         struct sadb_msg *hdr;
1684
1685         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1686         if (!skb)
1687                 return -ENOBUFS;
1688
1689         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1690         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1691         hdr->sadb_msg_errno = (uint8_t) 0;
1692         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1693
1694         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1695 }
1696
1697 static int key_notify_sa_flush(const struct km_event *c)
1698 {
1699         struct sk_buff *skb;
1700         struct sadb_msg *hdr;
1701
1702         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1703         if (!skb)
1704                 return -ENOBUFS;
1705         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1706         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1707         hdr->sadb_msg_type = SADB_FLUSH;
1708         hdr->sadb_msg_seq = c->seq;
1709         hdr->sadb_msg_pid = c->portid;
1710         hdr->sadb_msg_version = PF_KEY_V2;
1711         hdr->sadb_msg_errno = (uint8_t) 0;
1712         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1713         hdr->sadb_msg_reserved = 0;
1714
1715         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1716
1717         return 0;
1718 }
1719
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1721 {
1722         struct net *net = sock_net(sk);
1723         unsigned int proto;
1724         struct km_event c;
1725         struct xfrm_audit audit_info;
1726         int err, err2;
1727
1728         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729         if (proto == 0)
1730                 return -EINVAL;
1731
1732         audit_info.loginuid = audit_get_loginuid(current);
1733         audit_info.sessionid = audit_get_sessionid(current);
1734         audit_info.secid = 0;
1735         err = xfrm_state_flush(net, proto, &audit_info);
1736         err2 = unicast_flush_resp(sk, hdr);
1737         if (err || err2) {
1738                 if (err == -ESRCH) /* empty table - go quietly */
1739                         err = 0;
1740                 return err ? err : err2;
1741         }
1742
1743         c.data.proto = proto;
1744         c.seq = hdr->sadb_msg_seq;
1745         c.portid = hdr->sadb_msg_pid;
1746         c.event = XFRM_MSG_FLUSHSA;
1747         c.net = net;
1748         km_state_notify(NULL, &c);
1749
1750         return 0;
1751 }
1752
1753 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1754 {
1755         struct pfkey_sock *pfk = ptr;
1756         struct sk_buff *out_skb;
1757         struct sadb_msg *out_hdr;
1758
1759         if (!pfkey_can_dump(&pfk->sk))
1760                 return -ENOBUFS;
1761
1762         out_skb = pfkey_xfrm_state2msg(x);
1763         if (IS_ERR(out_skb))
1764                 return PTR_ERR(out_skb);
1765
1766         out_hdr = (struct sadb_msg *) out_skb->data;
1767         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1768         out_hdr->sadb_msg_type = SADB_DUMP;
1769         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1770         out_hdr->sadb_msg_errno = 0;
1771         out_hdr->sadb_msg_reserved = 0;
1772         out_hdr->sadb_msg_seq = count + 1;
1773         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
1774
1775         if (pfk->dump.skb)
1776                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1777                                 &pfk->sk, sock_net(&pfk->sk));
1778         pfk->dump.skb = out_skb;
1779
1780         return 0;
1781 }
1782
1783 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1784 {
1785         struct net *net = sock_net(&pfk->sk);
1786         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1787 }
1788
1789 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1790 {
1791         xfrm_state_walk_done(&pfk->dump.u.state);
1792 }
1793
1794 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1795 {
1796         u8 proto;
1797         struct pfkey_sock *pfk = pfkey_sk(sk);
1798
1799         if (pfk->dump.dump != NULL)
1800                 return -EBUSY;
1801
1802         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1803         if (proto == 0)
1804                 return -EINVAL;
1805
1806         pfk->dump.msg_version = hdr->sadb_msg_version;
1807         pfk->dump.msg_portid = hdr->sadb_msg_pid;
1808         pfk->dump.dump = pfkey_dump_sa;
1809         pfk->dump.done = pfkey_dump_sa_done;
1810         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1811
1812         return pfkey_do_dump(pfk);
1813 }
1814
1815 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1816 {
1817         struct pfkey_sock *pfk = pfkey_sk(sk);
1818         int satype = hdr->sadb_msg_satype;
1819         bool reset_errno = false;
1820
1821         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1822                 reset_errno = true;
1823                 if (satype != 0 && satype != 1)
1824                         return -EINVAL;
1825                 pfk->promisc = satype;
1826         }
1827         if (reset_errno && skb_cloned(skb))
1828                 skb = skb_copy(skb, GFP_KERNEL);
1829         else
1830                 skb = skb_clone(skb, GFP_KERNEL);
1831
1832         if (reset_errno && skb) {
1833                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1834                 new_hdr->sadb_msg_errno = 0;
1835         }
1836
1837         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1838         return 0;
1839 }
1840
1841 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1842 {
1843         int i;
1844         u32 reqid = *(u32*)ptr;
1845
1846         for (i=0; i<xp->xfrm_nr; i++) {
1847                 if (xp->xfrm_vec[i].reqid == reqid)
1848                         return -EEXIST;
1849         }
1850         return 0;
1851 }
1852
1853 static u32 gen_reqid(struct net *net)
1854 {
1855         struct xfrm_policy_walk walk;
1856         u32 start;
1857         int rc;
1858         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1859
1860         start = reqid;
1861         do {
1862                 ++reqid;
1863                 if (reqid == 0)
1864                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1865                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1866                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1867                 xfrm_policy_walk_done(&walk);
1868                 if (rc != -EEXIST)
1869                         return reqid;
1870         } while (reqid != start);
1871         return 0;
1872 }
1873
1874 static int
1875 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1876 {
1877         struct net *net = xp_net(xp);
1878         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1879         int mode;
1880
1881         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1882                 return -ELOOP;
1883
1884         if (rq->sadb_x_ipsecrequest_mode == 0)
1885                 return -EINVAL;
1886
1887         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1888         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1889                 return -EINVAL;
1890         t->mode = mode;
1891         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1892                 t->optional = 1;
1893         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1894                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1895                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1896                         t->reqid = 0;
1897                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1898                         return -ENOBUFS;
1899         }
1900
1901         /* addresses present only in tunnel mode */
1902         if (t->mode == XFRM_MODE_TUNNEL) {
1903                 u8 *sa = (u8 *) (rq + 1);
1904                 int family, socklen;
1905
1906                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1907                                                 &t->saddr);
1908                 if (!family)
1909                         return -EINVAL;
1910
1911                 socklen = pfkey_sockaddr_len(family);
1912                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1913                                            &t->id.daddr) != family)
1914                         return -EINVAL;
1915                 t->encap_family = family;
1916         } else
1917                 t->encap_family = xp->family;
1918
1919         /* No way to set this via kame pfkey */
1920         t->allalgs = 1;
1921         xp->xfrm_nr++;
1922         return 0;
1923 }
1924
1925 static int
1926 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1927 {
1928         int err;
1929         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1930         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1931
1932         if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
1933                 return -EINVAL;
1934
1935         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1936                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1937                         return err;
1938                 len -= rq->sadb_x_ipsecrequest_len;
1939                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1940         }
1941         return 0;
1942 }
1943
1944 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1945 {
1946   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1947
1948         if (xfrm_ctx) {
1949                 int len = sizeof(struct sadb_x_sec_ctx);
1950                 len += xfrm_ctx->ctx_len;
1951                 return PFKEY_ALIGN8(len);
1952         }
1953         return 0;
1954 }
1955
1956 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1957 {
1958         const struct xfrm_tmpl *t;
1959         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1960         int socklen = 0;
1961         int i;
1962
1963         for (i=0; i<xp->xfrm_nr; i++) {
1964                 t = xp->xfrm_vec + i;
1965                 socklen += pfkey_sockaddr_len(t->encap_family);
1966         }
1967
1968         return sizeof(struct sadb_msg) +
1969                 (sizeof(struct sadb_lifetime) * 3) +
1970                 (sizeof(struct sadb_address) * 2) +
1971                 (sockaddr_size * 2) +
1972                 sizeof(struct sadb_x_policy) +
1973                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1974                 (socklen * 2) +
1975                 pfkey_xfrm_policy2sec_ctx_size(xp);
1976 }
1977
1978 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
1979 {
1980         struct sk_buff *skb;
1981         int size;
1982
1983         size = pfkey_xfrm_policy2msg_size(xp);
1984
1985         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1986         if (skb == NULL)
1987                 return ERR_PTR(-ENOBUFS);
1988
1989         return skb;
1990 }
1991
1992 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
1993 {
1994         struct sadb_msg *hdr;
1995         struct sadb_address *addr;
1996         struct sadb_lifetime *lifetime;
1997         struct sadb_x_policy *pol;
1998         struct sadb_x_sec_ctx *sec_ctx;
1999         struct xfrm_sec_ctx *xfrm_ctx;
2000         int i;
2001         int size;
2002         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2003         int socklen = pfkey_sockaddr_len(xp->family);
2004
2005         size = pfkey_xfrm_policy2msg_size(xp);
2006
2007         /* call should fill header later */
2008         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2009         memset(hdr, 0, size);   /* XXX do we need this ? */
2010
2011         /* src address */
2012         addr = (struct sadb_address*) skb_put(skb,
2013                                               sizeof(struct sadb_address)+sockaddr_size);
2014         addr->sadb_address_len =
2015                 (sizeof(struct sadb_address)+sockaddr_size)/
2016                         sizeof(uint64_t);
2017         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2018         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2019         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2020         addr->sadb_address_reserved = 0;
2021         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2022                                  xp->selector.sport,
2023                                  (struct sockaddr *) (addr + 1),
2024                                  xp->family))
2025                 BUG();
2026
2027         /* dst address */
2028         addr = (struct sadb_address*) skb_put(skb,
2029                                               sizeof(struct sadb_address)+sockaddr_size);
2030         addr->sadb_address_len =
2031                 (sizeof(struct sadb_address)+sockaddr_size)/
2032                         sizeof(uint64_t);
2033         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2034         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2035         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2036         addr->sadb_address_reserved = 0;
2037
2038         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2039                             (struct sockaddr *) (addr + 1),
2040                             xp->family);
2041
2042         /* hard time */
2043         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2044                                                      sizeof(struct sadb_lifetime));
2045         lifetime->sadb_lifetime_len =
2046                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2048         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2049         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2050         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2051         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2052         /* soft time */
2053         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2054                                                      sizeof(struct sadb_lifetime));
2055         lifetime->sadb_lifetime_len =
2056                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2057         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2058         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2059         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2060         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2061         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2062         /* current time */
2063         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2064                                                      sizeof(struct sadb_lifetime));
2065         lifetime->sadb_lifetime_len =
2066                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2067         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2068         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2069         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2070         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2071         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2072
2073         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2074         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2075         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2076         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2077         if (xp->action == XFRM_POLICY_ALLOW) {
2078                 if (xp->xfrm_nr)
2079                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2080                 else
2081                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2082         }
2083         pol->sadb_x_policy_dir = dir+1;
2084         pol->sadb_x_policy_id = xp->index;
2085         pol->sadb_x_policy_priority = xp->priority;
2086
2087         for (i=0; i<xp->xfrm_nr; i++) {
2088                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2089                 struct sadb_x_ipsecrequest *rq;
2090                 int req_size;
2091                 int mode;
2092
2093                 req_size = sizeof(struct sadb_x_ipsecrequest);
2094                 if (t->mode == XFRM_MODE_TUNNEL) {
2095                         socklen = pfkey_sockaddr_len(t->encap_family);
2096                         req_size += socklen * 2;
2097                 } else {
2098                         size -= 2*socklen;
2099                 }
2100                 rq = (void*)skb_put(skb, req_size);
2101                 pol->sadb_x_policy_len += req_size/8;
2102                 memset(rq, 0, sizeof(*rq));
2103                 rq->sadb_x_ipsecrequest_len = req_size;
2104                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2105                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2106                         return -EINVAL;
2107                 rq->sadb_x_ipsecrequest_mode = mode;
2108                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2109                 if (t->reqid)
2110                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2111                 if (t->optional)
2112                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2113                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2114
2115                 if (t->mode == XFRM_MODE_TUNNEL) {
2116                         u8 *sa = (void *)(rq + 1);
2117                         pfkey_sockaddr_fill(&t->saddr, 0,
2118                                             (struct sockaddr *)sa,
2119                                             t->encap_family);
2120                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2121                                             (struct sockaddr *) (sa + socklen),
2122                                             t->encap_family);
2123                 }
2124         }
2125
2126         /* security context */
2127         if ((xfrm_ctx = xp->security)) {
2128                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2129
2130                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2131                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2132                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2133                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2134                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2135                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2136                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2137                        xfrm_ctx->ctx_len);
2138         }
2139
2140         hdr->sadb_msg_len = size / sizeof(uint64_t);
2141         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2142
2143         return 0;
2144 }
2145
2146 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2147 {
2148         struct sk_buff *out_skb;
2149         struct sadb_msg *out_hdr;
2150         int err;
2151
2152         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2153         if (IS_ERR(out_skb))
2154                 return PTR_ERR(out_skb);
2155
2156         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2157         if (err < 0)
2158                 return err;
2159
2160         out_hdr = (struct sadb_msg *) out_skb->data;
2161         out_hdr->sadb_msg_version = PF_KEY_V2;
2162
2163         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2164                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2165         else
2166                 out_hdr->sadb_msg_type = event2poltype(c->event);
2167         out_hdr->sadb_msg_errno = 0;
2168         out_hdr->sadb_msg_seq = c->seq;
2169         out_hdr->sadb_msg_pid = c->portid;
2170         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2171         return 0;
2172
2173 }
2174
2175 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2176 {
2177         struct net *net = sock_net(sk);
2178         int err = 0;
2179         struct sadb_lifetime *lifetime;
2180         struct sadb_address *sa;
2181         struct sadb_x_policy *pol;
2182         struct xfrm_policy *xp;
2183         struct km_event c;
2184         struct sadb_x_sec_ctx *sec_ctx;
2185
2186         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2188             !ext_hdrs[SADB_X_EXT_POLICY-1])
2189                 return -EINVAL;
2190
2191         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2192         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2193                 return -EINVAL;
2194         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2195                 return -EINVAL;
2196
2197         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2198         if (xp == NULL)
2199                 return -ENOBUFS;
2200
2201         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2202                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2203         xp->priority = pol->sadb_x_policy_priority;
2204
2205         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2206         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2207         if (!xp->family) {
2208                 err = -EINVAL;
2209                 goto out;
2210         }
2211         xp->selector.family = xp->family;
2212         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2213         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2214         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2215         if (xp->selector.sport)
2216                 xp->selector.sport_mask = htons(0xffff);
2217
2218         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2219         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2220         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2221
2222         /* Amusing, we set this twice.  KAME apps appear to set same value
2223          * in both addresses.
2224          */
2225         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226
2227         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2228         if (xp->selector.dport)
2229                 xp->selector.dport_mask = htons(0xffff);
2230
2231         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2232         if (sec_ctx != NULL) {
2233                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2234
2235                 if (!uctx) {
2236                         err = -ENOBUFS;
2237                         goto out;
2238                 }
2239
2240                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2241                 kfree(uctx);
2242
2243                 if (err)
2244                         goto out;
2245         }
2246
2247         xp->lft.soft_byte_limit = XFRM_INF;
2248         xp->lft.hard_byte_limit = XFRM_INF;
2249         xp->lft.soft_packet_limit = XFRM_INF;
2250         xp->lft.hard_packet_limit = XFRM_INF;
2251         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2252                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256         }
2257         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2258                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2259                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2260                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2261                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2262         }
2263         xp->xfrm_nr = 0;
2264         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2265             (err = parse_ipsecrequests(xp, pol)) < 0)
2266                 goto out;
2267
2268         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2269                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2270
2271         xfrm_audit_policy_add(xp, err ? 0 : 1,
2272                               audit_get_loginuid(current),
2273                               audit_get_sessionid(current), 0);
2274
2275         if (err)
2276                 goto out;
2277
2278         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2279                 c.event = XFRM_MSG_UPDPOLICY;
2280         else
2281                 c.event = XFRM_MSG_NEWPOLICY;
2282
2283         c.seq = hdr->sadb_msg_seq;
2284         c.portid = hdr->sadb_msg_pid;
2285
2286         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2287         xfrm_pol_put(xp);
2288         return 0;
2289
2290 out:
2291         xp->walk.dead = 1;
2292         xfrm_policy_destroy(xp);
2293         return err;
2294 }
2295
2296 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2297 {
2298         struct net *net = sock_net(sk);
2299         int err;
2300         struct sadb_address *sa;
2301         struct sadb_x_policy *pol;
2302         struct xfrm_policy *xp;
2303         struct xfrm_selector sel;
2304         struct km_event c;
2305         struct sadb_x_sec_ctx *sec_ctx;
2306         struct xfrm_sec_ctx *pol_ctx = NULL;
2307
2308         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2309                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2310             !ext_hdrs[SADB_X_EXT_POLICY-1])
2311                 return -EINVAL;
2312
2313         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2314         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2315                 return -EINVAL;
2316
2317         memset(&sel, 0, sizeof(sel));
2318
2319         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
2320         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2321         sel.prefixlen_s = sa->sadb_address_prefixlen;
2322         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2323         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2324         if (sel.sport)
2325                 sel.sport_mask = htons(0xffff);
2326
2327         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
2328         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2329         sel.prefixlen_d = sa->sadb_address_prefixlen;
2330         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332         if (sel.dport)
2333                 sel.dport_mask = htons(0xffff);
2334
2335         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2336         if (sec_ctx != NULL) {
2337                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2338
2339                 if (!uctx)
2340                         return -ENOMEM;
2341
2342                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2343                 kfree(uctx);
2344                 if (err)
2345                         return err;
2346         }
2347
2348         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2349                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2350                                    1, &err);
2351         security_xfrm_policy_free(pol_ctx);
2352         if (xp == NULL)
2353                 return -ENOENT;
2354
2355         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2356                                  audit_get_loginuid(current),
2357                                  audit_get_sessionid(current), 0);
2358
2359         if (err)
2360                 goto out;
2361
2362         c.seq = hdr->sadb_msg_seq;
2363         c.portid = hdr->sadb_msg_pid;
2364         c.data.byid = 0;
2365         c.event = XFRM_MSG_DELPOLICY;
2366         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367
2368 out:
2369         xfrm_pol_put(xp);
2370         if (err == 0)
2371                 xfrm_garbage_collect(net);
2372         return err;
2373 }
2374
2375 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2376 {
2377         int err;
2378         struct sk_buff *out_skb;
2379         struct sadb_msg *out_hdr;
2380         err = 0;
2381
2382         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2383         if (IS_ERR(out_skb)) {
2384                 err =  PTR_ERR(out_skb);
2385                 goto out;
2386         }
2387         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2388         if (err < 0)
2389                 goto out;
2390
2391         out_hdr = (struct sadb_msg *) out_skb->data;
2392         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2393         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2394         out_hdr->sadb_msg_satype = 0;
2395         out_hdr->sadb_msg_errno = 0;
2396         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2397         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2398         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2399         err = 0;
2400
2401 out:
2402         return err;
2403 }
2404
2405 #ifdef CONFIG_NET_KEY_MIGRATE
2406 static int pfkey_sockaddr_pair_size(sa_family_t family)
2407 {
2408         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2409 }
2410
2411 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2412                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2413                                u16 *family)
2414 {
2415         int af, socklen;
2416
2417         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2418                 return -EINVAL;
2419
2420         af = pfkey_sockaddr_extract(sa, saddr);
2421         if (!af)
2422                 return -EINVAL;
2423
2424         socklen = pfkey_sockaddr_len(af);
2425         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2426                                    daddr) != af)
2427                 return -EINVAL;
2428
2429         *family = af;
2430         return 0;
2431 }
2432
2433 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2434                                     struct xfrm_migrate *m)
2435 {
2436         int err;
2437         struct sadb_x_ipsecrequest *rq2;
2438         int mode;
2439
2440         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2441             len < rq1->sadb_x_ipsecrequest_len)
2442                 return -EINVAL;
2443
2444         /* old endoints */
2445         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2446                                   rq1->sadb_x_ipsecrequest_len,
2447                                   &m->old_saddr, &m->old_daddr,
2448                                   &m->old_family);
2449         if (err)
2450                 return err;
2451
2452         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2453         len -= rq1->sadb_x_ipsecrequest_len;
2454
2455         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2456             len < rq2->sadb_x_ipsecrequest_len)
2457                 return -EINVAL;
2458
2459         /* new endpoints */
2460         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2461                                   rq2->sadb_x_ipsecrequest_len,
2462                                   &m->new_saddr, &m->new_daddr,
2463                                   &m->new_family);
2464         if (err)
2465                 return err;
2466
2467         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2468             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2469             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2470                 return -EINVAL;
2471
2472         m->proto = rq1->sadb_x_ipsecrequest_proto;
2473         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2474                 return -EINVAL;
2475         m->mode = mode;
2476         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2477
2478         return ((int)(rq1->sadb_x_ipsecrequest_len +
2479                       rq2->sadb_x_ipsecrequest_len));
2480 }
2481
2482 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2483                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2484 {
2485         int i, len, ret, err = -EINVAL;
2486         u8 dir;
2487         struct sadb_address *sa;
2488         struct sadb_x_kmaddress *kma;
2489         struct sadb_x_policy *pol;
2490         struct sadb_x_ipsecrequest *rq;
2491         struct xfrm_selector sel;
2492         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2493         struct xfrm_kmaddress k;
2494
2495         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2496                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2497             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2498                 err = -EINVAL;
2499                 goto out;
2500         }
2501
2502         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2503         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2504
2505         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2506                 err = -EINVAL;
2507                 goto out;
2508         }
2509
2510         if (kma) {
2511                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2512                 k.reserved = kma->sadb_x_kmaddress_reserved;
2513                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2514                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2515                                           &k.local, &k.remote, &k.family);
2516                 if (ret < 0) {
2517                         err = ret;
2518                         goto out;
2519                 }
2520         }
2521
2522         dir = pol->sadb_x_policy_dir - 1;
2523         memset(&sel, 0, sizeof(sel));
2524
2525         /* set source address info of selector */
2526         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2527         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2528         sel.prefixlen_s = sa->sadb_address_prefixlen;
2529         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2530         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2531         if (sel.sport)
2532                 sel.sport_mask = htons(0xffff);
2533
2534         /* set destination address info of selector */
2535         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2536         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2537         sel.prefixlen_d = sa->sadb_address_prefixlen;
2538         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2539         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2540         if (sel.dport)
2541                 sel.dport_mask = htons(0xffff);
2542
2543         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2544
2545         /* extract ipsecrequests */
2546         i = 0;
2547         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2548
2549         while (len > 0 && i < XFRM_MAX_DEPTH) {
2550                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2551                 if (ret < 0) {
2552                         err = ret;
2553                         goto out;
2554                 } else {
2555                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2556                         len -= ret;
2557                         i++;
2558                 }
2559         }
2560
2561         if (!i || len > 0) {
2562                 err = -EINVAL;
2563                 goto out;
2564         }
2565
2566         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2567                             kma ? &k : NULL);
2568
2569  out:
2570         return err;
2571 }
2572 #else
2573 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2574                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2575 {
2576         return -ENOPROTOOPT;
2577 }
2578 #endif
2579
2580
2581 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2582 {
2583         struct net *net = sock_net(sk);
2584         unsigned int dir;
2585         int err = 0, delete;
2586         struct sadb_x_policy *pol;
2587         struct xfrm_policy *xp;
2588         struct km_event c;
2589
2590         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2591                 return -EINVAL;
2592
2593         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2594         if (dir >= XFRM_POLICY_MAX)
2595                 return -EINVAL;
2596
2597         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2598         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2599                               dir, pol->sadb_x_policy_id, delete, &err);
2600         if (xp == NULL)
2601                 return -ENOENT;
2602
2603         if (delete) {
2604                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2605                                 audit_get_loginuid(current),
2606                                 audit_get_sessionid(current), 0);
2607
2608                 if (err)
2609                         goto out;
2610                 c.seq = hdr->sadb_msg_seq;
2611                 c.portid = hdr->sadb_msg_pid;
2612                 c.data.byid = 1;
2613                 c.event = XFRM_MSG_DELPOLICY;
2614                 km_policy_notify(xp, dir, &c);
2615         } else {
2616                 err = key_pol_get_resp(sk, xp, hdr, dir);
2617         }
2618
2619 out:
2620         xfrm_pol_put(xp);
2621         if (delete && err == 0)
2622                 xfrm_garbage_collect(net);
2623         return err;
2624 }
2625
2626 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2627 {
2628         struct pfkey_sock *pfk = ptr;
2629         struct sk_buff *out_skb;
2630         struct sadb_msg *out_hdr;
2631         int err;
2632
2633         if (!pfkey_can_dump(&pfk->sk))
2634                 return -ENOBUFS;
2635
2636         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2637         if (IS_ERR(out_skb))
2638                 return PTR_ERR(out_skb);
2639
2640         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2641         if (err < 0)
2642                 return err;
2643
2644         out_hdr = (struct sadb_msg *) out_skb->data;
2645         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2646         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2647         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2648         out_hdr->sadb_msg_errno = 0;
2649         out_hdr->sadb_msg_seq = count + 1;
2650         out_hdr->sadb_msg_pid = pfk->dump.msg_portid;
2651
2652         if (pfk->dump.skb)
2653                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2654                                 &pfk->sk, sock_net(&pfk->sk));
2655         pfk->dump.skb = out_skb;
2656
2657         return 0;
2658 }
2659
2660 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2661 {
2662         struct net *net = sock_net(&pfk->sk);
2663         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2664 }
2665
2666 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2667 {
2668         xfrm_policy_walk_done(&pfk->dump.u.policy);
2669 }
2670
2671 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2672 {
2673         struct pfkey_sock *pfk = pfkey_sk(sk);
2674
2675         if (pfk->dump.dump != NULL)
2676                 return -EBUSY;
2677
2678         pfk->dump.msg_version = hdr->sadb_msg_version;
2679         pfk->dump.msg_portid = hdr->sadb_msg_pid;
2680         pfk->dump.dump = pfkey_dump_sp;
2681         pfk->dump.done = pfkey_dump_sp_done;
2682         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2683
2684         return pfkey_do_dump(pfk);
2685 }
2686
2687 static int key_notify_policy_flush(const struct km_event *c)
2688 {
2689         struct sk_buff *skb_out;
2690         struct sadb_msg *hdr;
2691
2692         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2693         if (!skb_out)
2694                 return -ENOBUFS;
2695         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2696         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2697         hdr->sadb_msg_seq = c->seq;
2698         hdr->sadb_msg_pid = c->portid;
2699         hdr->sadb_msg_version = PF_KEY_V2;
2700         hdr->sadb_msg_errno = (uint8_t) 0;
2701         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2702         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2703         hdr->sadb_msg_reserved = 0;
2704         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2705         return 0;
2706
2707 }
2708
2709 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2710 {
2711         struct net *net = sock_net(sk);
2712         struct km_event c;
2713         struct xfrm_audit audit_info;
2714         int err, err2;
2715
2716         audit_info.loginuid = audit_get_loginuid(current);
2717         audit_info.sessionid = audit_get_sessionid(current);
2718         audit_info.secid = 0;
2719         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2720         err2 = unicast_flush_resp(sk, hdr);
2721         if (err || err2) {
2722                 if (err == -ESRCH) /* empty table - old silent behavior */
2723                         return 0;
2724                 return err;
2725         }
2726
2727         c.data.type = XFRM_POLICY_TYPE_MAIN;
2728         c.event = XFRM_MSG_FLUSHPOLICY;
2729         c.portid = hdr->sadb_msg_pid;
2730         c.seq = hdr->sadb_msg_seq;
2731         c.net = net;
2732         km_policy_notify(NULL, 0, &c);
2733
2734         return 0;
2735 }
2736
2737 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2738                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2739 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2740         [SADB_RESERVED]         = pfkey_reserved,
2741         [SADB_GETSPI]           = pfkey_getspi,
2742         [SADB_UPDATE]           = pfkey_add,
2743         [SADB_ADD]              = pfkey_add,
2744         [SADB_DELETE]           = pfkey_delete,
2745         [SADB_GET]              = pfkey_get,
2746         [SADB_ACQUIRE]          = pfkey_acquire,
2747         [SADB_REGISTER]         = pfkey_register,
2748         [SADB_EXPIRE]           = NULL,
2749         [SADB_FLUSH]            = pfkey_flush,
2750         [SADB_DUMP]             = pfkey_dump,
2751         [SADB_X_PROMISC]        = pfkey_promisc,
2752         [SADB_X_PCHANGE]        = NULL,
2753         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2754         [SADB_X_SPDADD]         = pfkey_spdadd,
2755         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2756         [SADB_X_SPDGET]         = pfkey_spdget,
2757         [SADB_X_SPDACQUIRE]     = NULL,
2758         [SADB_X_SPDDUMP]        = pfkey_spddump,
2759         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2760         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2761         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2762         [SADB_X_MIGRATE]        = pfkey_migrate,
2763 };
2764
2765 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2766 {
2767         void *ext_hdrs[SADB_EXT_MAX];
2768         int err;
2769
2770         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2771                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2772
2773         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2774         err = parse_exthdrs(skb, hdr, ext_hdrs);
2775         if (!err) {
2776                 err = -EOPNOTSUPP;
2777                 if (pfkey_funcs[hdr->sadb_msg_type])
2778                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2779         }
2780         return err;
2781 }
2782
2783 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2784 {
2785         struct sadb_msg *hdr = NULL;
2786
2787         if (skb->len < sizeof(*hdr)) {
2788                 *errp = -EMSGSIZE;
2789         } else {
2790                 hdr = (struct sadb_msg *) skb->data;
2791                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2792                     hdr->sadb_msg_reserved != 0 ||
2793                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2794                      hdr->sadb_msg_type > SADB_MAX)) {
2795                         hdr = NULL;
2796                         *errp = -EINVAL;
2797                 } else if (hdr->sadb_msg_len != (skb->len /
2798                                                  sizeof(uint64_t)) ||
2799                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2800                                                 sizeof(uint64_t))) {
2801                         hdr = NULL;
2802                         *errp = -EMSGSIZE;
2803                 } else {
2804                         *errp = 0;
2805                 }
2806         }
2807         return hdr;
2808 }
2809
2810 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2811                                 const struct xfrm_algo_desc *d)
2812 {
2813         unsigned int id = d->desc.sadb_alg_id;
2814
2815         if (id >= sizeof(t->aalgos) * 8)
2816                 return 0;
2817
2818         return (t->aalgos >> id) & 1;
2819 }
2820
2821 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2822                                 const struct xfrm_algo_desc *d)
2823 {
2824         unsigned int id = d->desc.sadb_alg_id;
2825
2826         if (id >= sizeof(t->ealgos) * 8)
2827                 return 0;
2828
2829         return (t->ealgos >> id) & 1;
2830 }
2831
2832 static int count_ah_combs(const struct xfrm_tmpl *t)
2833 {
2834         int i, sz = 0;
2835
2836         for (i = 0; ; i++) {
2837                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2838                 if (!aalg)
2839                         break;
2840                 if (!aalg->pfkey_supported)
2841                         continue;
2842                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2843                         sz += sizeof(struct sadb_comb);
2844         }
2845         return sz + sizeof(struct sadb_prop);
2846 }
2847
2848 static int count_esp_combs(const struct xfrm_tmpl *t)
2849 {
2850         int i, k, sz = 0;
2851
2852         for (i = 0; ; i++) {
2853                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2854                 if (!ealg)
2855                         break;
2856
2857                 if (!ealg->pfkey_supported)
2858                         continue;
2859
2860                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2861                         continue;
2862
2863                 for (k = 1; ; k++) {
2864                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2865                         if (!aalg)
2866                                 break;
2867
2868                         if (!aalg->pfkey_supported)
2869                                 continue;
2870
2871                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2872                                 sz += sizeof(struct sadb_comb);
2873                 }
2874         }
2875         return sz + sizeof(struct sadb_prop);
2876 }
2877
2878 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2879 {
2880         struct sadb_prop *p;
2881         int i;
2882
2883         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2884         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2885         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2886         p->sadb_prop_replay = 32;
2887         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2888
2889         for (i = 0; ; i++) {
2890                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2891                 if (!aalg)
2892                         break;
2893
2894                 if (!aalg->pfkey_supported)
2895                         continue;
2896
2897                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2898                         struct sadb_comb *c;
2899                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2900                         memset(c, 0, sizeof(*c));
2901                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2902                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2903                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2904                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2905                         c->sadb_comb_hard_addtime = 24*60*60;
2906                         c->sadb_comb_soft_addtime = 20*60*60;
2907                         c->sadb_comb_hard_usetime = 8*60*60;
2908                         c->sadb_comb_soft_usetime = 7*60*60;
2909                 }
2910         }
2911 }
2912
2913 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2914 {
2915         struct sadb_prop *p;
2916         int i, k;
2917
2918         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2919         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2920         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2921         p->sadb_prop_replay = 32;
2922         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2923
2924         for (i=0; ; i++) {
2925                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2926                 if (!ealg)
2927                         break;
2928
2929                 if (!ealg->pfkey_supported)
2930                         continue;
2931
2932                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2933                         continue;
2934
2935                 for (k = 1; ; k++) {
2936                         struct sadb_comb *c;
2937                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2938                         if (!aalg)
2939                                 break;
2940                         if (!aalg->pfkey_supported)
2941                                 continue;
2942                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2943                                 continue;
2944                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2945                         memset(c, 0, sizeof(*c));
2946                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2947                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2948                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2949                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2950                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2951                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2952                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2953                         c->sadb_comb_hard_addtime = 24*60*60;
2954                         c->sadb_comb_soft_addtime = 20*60*60;
2955                         c->sadb_comb_hard_usetime = 8*60*60;
2956                         c->sadb_comb_soft_usetime = 7*60*60;
2957                 }
2958         }
2959 }
2960
2961 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2962 {
2963         return 0;
2964 }
2965
2966 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2967 {
2968         struct sk_buff *out_skb;
2969         struct sadb_msg *out_hdr;
2970         int hard;
2971         int hsc;
2972
2973         hard = c->data.hard;
2974         if (hard)
2975                 hsc = 2;
2976         else
2977                 hsc = 1;
2978
2979         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2980         if (IS_ERR(out_skb))
2981                 return PTR_ERR(out_skb);
2982
2983         out_hdr = (struct sadb_msg *) out_skb->data;
2984         out_hdr->sadb_msg_version = PF_KEY_V2;
2985         out_hdr->sadb_msg_type = SADB_EXPIRE;
2986         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2987         out_hdr->sadb_msg_errno = 0;
2988         out_hdr->sadb_msg_reserved = 0;
2989         out_hdr->sadb_msg_seq = 0;
2990         out_hdr->sadb_msg_pid = 0;
2991
2992         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2993         return 0;
2994 }
2995
2996 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
2997 {
2998         struct net *net = x ? xs_net(x) : c->net;
2999         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3000
3001         if (atomic_read(&net_pfkey->socks_nr) == 0)
3002                 return 0;
3003
3004         switch (c->event) {
3005         case XFRM_MSG_EXPIRE:
3006                 return key_notify_sa_expire(x, c);
3007         case XFRM_MSG_DELSA:
3008         case XFRM_MSG_NEWSA:
3009         case XFRM_MSG_UPDSA:
3010                 return key_notify_sa(x, c);
3011         case XFRM_MSG_FLUSHSA:
3012                 return key_notify_sa_flush(c);
3013         case XFRM_MSG_NEWAE: /* not yet supported */
3014                 break;
3015         default:
3016                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3017                 break;
3018         }
3019
3020         return 0;
3021 }
3022
3023 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3024 {
3025         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3026                 return 0;
3027
3028         switch (c->event) {
3029         case XFRM_MSG_POLEXPIRE:
3030                 return key_notify_policy_expire(xp, c);
3031         case XFRM_MSG_DELPOLICY:
3032         case XFRM_MSG_NEWPOLICY:
3033         case XFRM_MSG_UPDPOLICY:
3034                 return key_notify_policy(xp, dir, c);
3035         case XFRM_MSG_FLUSHPOLICY:
3036                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3037                         break;
3038                 return key_notify_policy_flush(c);
3039         default:
3040                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3041                 break;
3042         }
3043
3044         return 0;
3045 }
3046
3047 static u32 get_acqseq(void)
3048 {
3049         u32 res;
3050         static atomic_t acqseq;
3051
3052         do {
3053                 res = atomic_inc_return(&acqseq);
3054         } while (!res);
3055         return res;
3056 }
3057
3058 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
3059 {
3060         struct sk_buff *skb;
3061         struct sadb_msg *hdr;
3062         struct sadb_address *addr;
3063         struct sadb_x_policy *pol;
3064         int sockaddr_size;
3065         int size;
3066         struct sadb_x_sec_ctx *sec_ctx;
3067         struct xfrm_sec_ctx *xfrm_ctx;
3068         int ctx_size = 0;
3069
3070         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3071         if (!sockaddr_size)
3072                 return -EINVAL;
3073
3074         size = sizeof(struct sadb_msg) +
3075                 (sizeof(struct sadb_address) * 2) +
3076                 (sockaddr_size * 2) +
3077                 sizeof(struct sadb_x_policy);
3078
3079         if (x->id.proto == IPPROTO_AH)
3080                 size += count_ah_combs(t);
3081         else if (x->id.proto == IPPROTO_ESP)
3082                 size += count_esp_combs(t);
3083
3084         if ((xfrm_ctx = x->security)) {
3085                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3086                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3087         }
3088
3089         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3090         if (skb == NULL)
3091                 return -ENOMEM;
3092
3093         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3094         hdr->sadb_msg_version = PF_KEY_V2;
3095         hdr->sadb_msg_type = SADB_ACQUIRE;
3096         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3097         hdr->sadb_msg_len = size / sizeof(uint64_t);
3098         hdr->sadb_msg_errno = 0;
3099         hdr->sadb_msg_reserved = 0;
3100         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3101         hdr->sadb_msg_pid = 0;
3102
3103         /* src address */
3104         addr = (struct sadb_address*) skb_put(skb,
3105                                               sizeof(struct sadb_address)+sockaddr_size);
3106         addr->sadb_address_len =
3107                 (sizeof(struct sadb_address)+sockaddr_size)/
3108                         sizeof(uint64_t);
3109         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3110         addr->sadb_address_proto = 0;
3111         addr->sadb_address_reserved = 0;
3112         addr->sadb_address_prefixlen =
3113                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3114                                     (struct sockaddr *) (addr + 1),
3115                                     x->props.family);
3116         if (!addr->sadb_address_prefixlen)
3117                 BUG();
3118
3119         /* dst address */
3120         addr = (struct sadb_address*) skb_put(skb,
3121                                               sizeof(struct sadb_address)+sockaddr_size);
3122         addr->sadb_address_len =
3123                 (sizeof(struct sadb_address)+sockaddr_size)/
3124                         sizeof(uint64_t);
3125         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3126         addr->sadb_address_proto = 0;
3127         addr->sadb_address_reserved = 0;
3128         addr->sadb_address_prefixlen =
3129                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3130                                     (struct sockaddr *) (addr + 1),
3131                                     x->props.family);
3132         if (!addr->sadb_address_prefixlen)
3133                 BUG();
3134
3135         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3136         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3137         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3138         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3139         pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1;
3140         pol->sadb_x_policy_id = xp->index;
3141
3142         /* Set sadb_comb's. */
3143         if (x->id.proto == IPPROTO_AH)
3144                 dump_ah_combs(skb, t);
3145         else if (x->id.proto == IPPROTO_ESP)
3146                 dump_esp_combs(skb, t);
3147
3148         /* security context */
3149         if (xfrm_ctx) {
3150                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3151                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3152                 sec_ctx->sadb_x_sec_len =
3153                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3154                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3155                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3156                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3157                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3158                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3159                        xfrm_ctx->ctx_len);
3160         }
3161
3162         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3163 }
3164
3165 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3166                                                 u8 *data, int len, int *dir)
3167 {
3168         struct net *net = sock_net(sk);
3169         struct xfrm_policy *xp;
3170         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3171         struct sadb_x_sec_ctx *sec_ctx;
3172
3173         switch (sk->sk_family) {
3174         case AF_INET:
3175                 if (opt != IP_IPSEC_POLICY) {
3176                         *dir = -EOPNOTSUPP;
3177                         return NULL;
3178                 }
3179                 break;
3180 #if IS_ENABLED(CONFIG_IPV6)
3181         case AF_INET6:
3182                 if (opt != IPV6_IPSEC_POLICY) {
3183                         *dir = -EOPNOTSUPP;
3184                         return NULL;
3185                 }
3186                 break;
3187 #endif
3188         default:
3189                 *dir = -EINVAL;
3190                 return NULL;
3191         }
3192
3193         *dir = -EINVAL;
3194
3195         if (len < sizeof(struct sadb_x_policy) ||
3196             pol->sadb_x_policy_len*8 > len ||
3197             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3198             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3199                 return NULL;
3200
3201         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3202         if (xp == NULL) {
3203                 *dir = -ENOBUFS;
3204                 return NULL;
3205         }
3206
3207         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3208                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3209
3210         xp->lft.soft_byte_limit = XFRM_INF;
3211         xp->lft.hard_byte_limit = XFRM_INF;
3212         xp->lft.soft_packet_limit = XFRM_INF;
3213         xp->lft.hard_packet_limit = XFRM_INF;
3214         xp->family = sk->sk_family;
3215
3216         xp->xfrm_nr = 0;
3217         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3218             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3219                 goto out;
3220
3221         /* security context too */
3222         if (len >= (pol->sadb_x_policy_len*8 +
3223             sizeof(struct sadb_x_sec_ctx))) {
3224                 char *p = (char *)pol;
3225                 struct xfrm_user_sec_ctx *uctx;
3226
3227                 p += pol->sadb_x_policy_len*8;
3228                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3229                 if (len < pol->sadb_x_policy_len*8 +
3230                     sec_ctx->sadb_x_sec_len) {
3231                         *dir = -EINVAL;
3232                         goto out;
3233                 }
3234                 if ((*dir = verify_sec_ctx_len(p)))
3235                         goto out;
3236                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3237                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3238                 kfree(uctx);
3239
3240                 if (*dir)
3241                         goto out;
3242         }
3243
3244         *dir = pol->sadb_x_policy_dir-1;
3245         return xp;
3246
3247 out:
3248         xp->walk.dead = 1;
3249         xfrm_policy_destroy(xp);
3250         return NULL;
3251 }
3252
3253 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3254 {
3255         struct sk_buff *skb;
3256         struct sadb_msg *hdr;
3257         struct sadb_sa *sa;
3258         struct sadb_address *addr;
3259         struct sadb_x_nat_t_port *n_port;
3260         int sockaddr_size;
3261         int size;
3262         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3263         struct xfrm_encap_tmpl *natt = NULL;
3264
3265         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3266         if (!sockaddr_size)
3267                 return -EINVAL;
3268
3269         if (!satype)
3270                 return -EINVAL;
3271
3272         if (!x->encap)
3273                 return -EINVAL;
3274
3275         natt = x->encap;
3276
3277         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3278          *
3279          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3280          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3281          */
3282
3283         size = sizeof(struct sadb_msg) +
3284                 sizeof(struct sadb_sa) +
3285                 (sizeof(struct sadb_address) * 2) +
3286                 (sockaddr_size * 2) +
3287                 (sizeof(struct sadb_x_nat_t_port) * 2);
3288
3289         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3290         if (skb == NULL)
3291                 return -ENOMEM;
3292
3293         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3294         hdr->sadb_msg_version = PF_KEY_V2;
3295         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3296         hdr->sadb_msg_satype = satype;
3297         hdr->sadb_msg_len = size / sizeof(uint64_t);
3298         hdr->sadb_msg_errno = 0;
3299         hdr->sadb_msg_reserved = 0;
3300         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3301         hdr->sadb_msg_pid = 0;
3302
3303         /* SA */
3304         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3305         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3306         sa->sadb_sa_exttype = SADB_EXT_SA;
3307         sa->sadb_sa_spi = x->id.spi;
3308         sa->sadb_sa_replay = 0;
3309         sa->sadb_sa_state = 0;
3310         sa->sadb_sa_auth = 0;
3311         sa->sadb_sa_encrypt = 0;
3312         sa->sadb_sa_flags = 0;
3313
3314         /* ADDRESS_SRC (old addr) */
3315         addr = (struct sadb_address*)
3316                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3317         addr->sadb_address_len =
3318                 (sizeof(struct sadb_address)+sockaddr_size)/
3319                         sizeof(uint64_t);
3320         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3321         addr->sadb_address_proto = 0;
3322         addr->sadb_address_reserved = 0;
3323         addr->sadb_address_prefixlen =
3324                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3325                                     (struct sockaddr *) (addr + 1),
3326                                     x->props.family);
3327         if (!addr->sadb_address_prefixlen)
3328                 BUG();
3329
3330         /* NAT_T_SPORT (old port) */
3331         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3332         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3333         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3334         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3335         n_port->sadb_x_nat_t_port_reserved = 0;
3336
3337         /* ADDRESS_DST (new addr) */
3338         addr = (struct sadb_address*)
3339                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3340         addr->sadb_address_len =
3341                 (sizeof(struct sadb_address)+sockaddr_size)/
3342                         sizeof(uint64_t);
3343         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3344         addr->sadb_address_proto = 0;
3345         addr->sadb_address_reserved = 0;
3346         addr->sadb_address_prefixlen =
3347                 pfkey_sockaddr_fill(ipaddr, 0,
3348                                     (struct sockaddr *) (addr + 1),
3349                                     x->props.family);
3350         if (!addr->sadb_address_prefixlen)
3351                 BUG();
3352
3353         /* NAT_T_DPORT (new port) */
3354         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3355         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3356         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3357         n_port->sadb_x_nat_t_port_port = sport;
3358         n_port->sadb_x_nat_t_port_reserved = 0;
3359
3360         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3361 }
3362
3363 #ifdef CONFIG_NET_KEY_MIGRATE
3364 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3365                             const struct xfrm_selector *sel)
3366 {
3367         struct sadb_address *addr;
3368         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3369         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3370         addr->sadb_address_exttype = type;
3371         addr->sadb_address_proto = sel->proto;
3372         addr->sadb_address_reserved = 0;
3373
3374         switch (type) {
3375         case SADB_EXT_ADDRESS_SRC:
3376                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3377                 pfkey_sockaddr_fill(&sel->saddr, 0,
3378                                     (struct sockaddr *)(addr + 1),
3379                                     sel->family);
3380                 break;
3381         case SADB_EXT_ADDRESS_DST:
3382                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3383                 pfkey_sockaddr_fill(&sel->daddr, 0,
3384                                     (struct sockaddr *)(addr + 1),
3385                                     sel->family);
3386                 break;
3387         default:
3388                 return -EINVAL;
3389         }
3390
3391         return 0;
3392 }
3393
3394
3395 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3396 {
3397         struct sadb_x_kmaddress *kma;
3398         u8 *sa;
3399         int family = k->family;
3400         int socklen = pfkey_sockaddr_len(family);
3401         int size_req;
3402
3403         size_req = (sizeof(struct sadb_x_kmaddress) +
3404                     pfkey_sockaddr_pair_size(family));
3405
3406         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3407         memset(kma, 0, size_req);
3408         kma->sadb_x_kmaddress_len = size_req / 8;
3409         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3410         kma->sadb_x_kmaddress_reserved = k->reserved;
3411
3412         sa = (u8 *)(kma + 1);
3413         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3414             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3415                 return -EINVAL;
3416
3417         return 0;
3418 }
3419
3420 static int set_ipsecrequest(struct sk_buff *skb,
3421                             uint8_t proto, uint8_t mode, int level,
3422                             uint32_t reqid, uint8_t family,
3423                             const xfrm_address_t *src, const xfrm_address_t *dst)
3424 {
3425         struct sadb_x_ipsecrequest *rq;
3426         u8 *sa;
3427         int socklen = pfkey_sockaddr_len(family);
3428         int size_req;
3429
3430         size_req = sizeof(struct sadb_x_ipsecrequest) +
3431                    pfkey_sockaddr_pair_size(family);
3432
3433         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3434         memset(rq, 0, size_req);
3435         rq->sadb_x_ipsecrequest_len = size_req;
3436         rq->sadb_x_ipsecrequest_proto = proto;
3437         rq->sadb_x_ipsecrequest_mode = mode;
3438         rq->sadb_x_ipsecrequest_level = level;
3439         rq->sadb_x_ipsecrequest_reqid = reqid;
3440
3441         sa = (u8 *) (rq + 1);
3442         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3443             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3444                 return -EINVAL;
3445
3446         return 0;
3447 }
3448 #endif
3449
3450 #ifdef CONFIG_NET_KEY_MIGRATE
3451 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3452                               const struct xfrm_migrate *m, int num_bundles,
3453                               const struct xfrm_kmaddress *k)
3454 {
3455         int i;
3456         int sasize_sel;
3457         int size = 0;
3458         int size_pol = 0;
3459         struct sk_buff *skb;
3460         struct sadb_msg *hdr;
3461         struct sadb_x_policy *pol;
3462         const struct xfrm_migrate *mp;
3463
3464         if (type != XFRM_POLICY_TYPE_MAIN)
3465                 return 0;
3466
3467         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3468                 return -EINVAL;
3469
3470         if (k != NULL) {
3471                 /* addresses for KM */
3472                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3473                                      pfkey_sockaddr_pair_size(k->family));
3474         }
3475
3476         /* selector */
3477         sasize_sel = pfkey_sockaddr_size(sel->family);
3478         if (!sasize_sel)
3479                 return -EINVAL;
3480         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3481
3482         /* policy info */
3483         size_pol += sizeof(struct sadb_x_policy);
3484
3485         /* ipsecrequests */
3486         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3487                 /* old locator pair */
3488                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3489                             pfkey_sockaddr_pair_size(mp->old_family);
3490                 /* new locator pair */
3491                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3492                             pfkey_sockaddr_pair_size(mp->new_family);
3493         }
3494
3495         size += sizeof(struct sadb_msg) + size_pol;
3496
3497         /* alloc buffer */
3498         skb = alloc_skb(size, GFP_ATOMIC);
3499         if (skb == NULL)
3500                 return -ENOMEM;
3501
3502         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3503         hdr->sadb_msg_version = PF_KEY_V2;
3504         hdr->sadb_msg_type = SADB_X_MIGRATE;
3505         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3506         hdr->sadb_msg_len = size / 8;
3507         hdr->sadb_msg_errno = 0;
3508         hdr->sadb_msg_reserved = 0;
3509         hdr->sadb_msg_seq = 0;
3510         hdr->sadb_msg_pid = 0;
3511
3512         /* Addresses to be used by KM for negotiation, if ext is available */
3513         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3514                 goto err;
3515
3516         /* selector src */
3517         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3518
3519         /* selector dst */
3520         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3521
3522         /* policy information */
3523         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3524         pol->sadb_x_policy_len = size_pol / 8;
3525         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3526         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3527         pol->sadb_x_policy_dir = dir + 1;
3528         pol->sadb_x_policy_id = 0;
3529         pol->sadb_x_policy_priority = 0;
3530
3531         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3532                 /* old ipsecrequest */
3533                 int mode = pfkey_mode_from_xfrm(mp->mode);
3534                 if (mode < 0)
3535                         goto err;
3536                 if (set_ipsecrequest(skb, mp->proto, mode,
3537                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3538                                      mp->reqid, mp->old_family,
3539                                      &mp->old_saddr, &mp->old_daddr) < 0)
3540                         goto err;
3541
3542                 /* new ipsecrequest */
3543                 if (set_ipsecrequest(skb, mp->proto, mode,
3544                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3545                                      mp->reqid, mp->new_family,
3546                                      &mp->new_saddr, &mp->new_daddr) < 0)
3547                         goto err;
3548         }
3549
3550         /* broadcast migrate message to sockets */
3551         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3552
3553         return 0;
3554
3555 err:
3556         kfree_skb(skb);
3557         return -EINVAL;
3558 }
3559 #else
3560 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3561                               const struct xfrm_migrate *m, int num_bundles,
3562                               const struct xfrm_kmaddress *k)
3563 {
3564         return -ENOPROTOOPT;
3565 }
3566 #endif
3567
3568 static int pfkey_sendmsg(struct kiocb *kiocb,
3569                          struct socket *sock, struct msghdr *msg, size_t len)
3570 {
3571         struct sock *sk = sock->sk;
3572         struct sk_buff *skb = NULL;
3573         struct sadb_msg *hdr = NULL;
3574         int err;
3575
3576         err = -EOPNOTSUPP;
3577         if (msg->msg_flags & MSG_OOB)
3578                 goto out;
3579
3580         err = -EMSGSIZE;
3581         if ((unsigned int)len > sk->sk_sndbuf - 32)
3582                 goto out;
3583
3584         err = -ENOBUFS;
3585         skb = alloc_skb(len, GFP_KERNEL);
3586         if (skb == NULL)
3587                 goto out;
3588
3589         err = -EFAULT;
3590         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3591                 goto out;
3592
3593         hdr = pfkey_get_base_msg(skb, &err);
3594         if (!hdr)
3595                 goto out;
3596
3597         mutex_lock(&xfrm_cfg_mutex);
3598         err = pfkey_process(sk, skb, hdr);
3599         mutex_unlock(&xfrm_cfg_mutex);
3600
3601 out:
3602         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3603                 err = 0;
3604         kfree_skb(skb);
3605
3606         return err ? : len;
3607 }
3608
3609 static int pfkey_recvmsg(struct kiocb *kiocb,
3610                          struct socket *sock, struct msghdr *msg, size_t len,
3611                          int flags)
3612 {
3613         struct sock *sk = sock->sk;
3614         struct pfkey_sock *pfk = pfkey_sk(sk);
3615         struct sk_buff *skb;
3616         int copied, err;
3617
3618         err = -EINVAL;
3619         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3620                 goto out;
3621
3622         msg->msg_namelen = 0;
3623         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3624         if (skb == NULL)
3625                 goto out;
3626
3627         copied = skb->len;
3628         if (copied > len) {
3629                 msg->msg_flags |= MSG_TRUNC;
3630                 copied = len;
3631         }
3632
3633         skb_reset_transport_header(skb);
3634         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3635         if (err)
3636                 goto out_free;
3637
3638         sock_recv_ts_and_drops(msg, sk, skb);
3639
3640         err = (flags & MSG_TRUNC) ? skb->len : copied;
3641
3642         if (pfk->dump.dump != NULL &&
3643             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3644                 pfkey_do_dump(pfk);
3645
3646 out_free:
3647         skb_free_datagram(sk, skb);
3648 out:
3649         return err;
3650 }
3651
3652 static const struct proto_ops pfkey_ops = {
3653         .family         =       PF_KEY,
3654         .owner          =       THIS_MODULE,
3655         /* Operations that make no sense on pfkey sockets. */
3656         .bind           =       sock_no_bind,
3657         .connect        =       sock_no_connect,
3658         .socketpair     =       sock_no_socketpair,
3659         .accept         =       sock_no_accept,
3660         .getname        =       sock_no_getname,
3661         .ioctl          =       sock_no_ioctl,
3662         .listen         =       sock_no_listen,
3663         .shutdown       =       sock_no_shutdown,
3664         .setsockopt     =       sock_no_setsockopt,
3665         .getsockopt     =       sock_no_getsockopt,
3666         .mmap           =       sock_no_mmap,
3667         .sendpage       =       sock_no_sendpage,
3668
3669         /* Now the operations that really occur. */
3670         .release        =       pfkey_release,
3671         .poll           =       datagram_poll,
3672         .sendmsg        =       pfkey_sendmsg,
3673         .recvmsg        =       pfkey_recvmsg,
3674 };
3675
3676 static const struct net_proto_family pfkey_family_ops = {
3677         .family =       PF_KEY,
3678         .create =       pfkey_create,
3679         .owner  =       THIS_MODULE,
3680 };
3681
3682 #ifdef CONFIG_PROC_FS
3683 static int pfkey_seq_show(struct seq_file *f, void *v)
3684 {
3685         struct sock *s = sk_entry(v);
3686
3687         if (v == SEQ_START_TOKEN)
3688                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3689         else
3690                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3691                                s,
3692                                atomic_read(&s->sk_refcnt),
3693                                sk_rmem_alloc_get(s),
3694                                sk_wmem_alloc_get(s),
3695                                from_kuid_munged(seq_user_ns(f), sock_i_uid(s)),
3696                                sock_i_ino(s)
3697                                );
3698         return 0;
3699 }
3700
3701 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3702         __acquires(rcu)
3703 {
3704         struct net *net = seq_file_net(f);
3705         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3706
3707         rcu_read_lock();
3708         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3709 }
3710
3711 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3712 {
3713         struct net *net = seq_file_net(f);
3714         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3715
3716         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3717 }
3718
3719 static void pfkey_seq_stop(struct seq_file *f, void *v)
3720         __releases(rcu)
3721 {
3722         rcu_read_unlock();
3723 }
3724
3725 static const struct seq_operations pfkey_seq_ops = {
3726         .start  = pfkey_seq_start,
3727         .next   = pfkey_seq_next,
3728         .stop   = pfkey_seq_stop,
3729         .show   = pfkey_seq_show,
3730 };
3731
3732 static int pfkey_seq_open(struct inode *inode, struct file *file)
3733 {
3734         return seq_open_net(inode, file, &pfkey_seq_ops,
3735                             sizeof(struct seq_net_private));
3736 }
3737
3738 static const struct file_operations pfkey_proc_ops = {
3739         .open    = pfkey_seq_open,
3740         .read    = seq_read,
3741         .llseek  = seq_lseek,
3742         .release = seq_release_net,
3743 };
3744
3745 static int __net_init pfkey_init_proc(struct net *net)
3746 {
3747         struct proc_dir_entry *e;
3748
3749         e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops);
3750         if (e == NULL)
3751                 return -ENOMEM;
3752
3753         return 0;
3754 }
3755
3756 static void __net_exit pfkey_exit_proc(struct net *net)
3757 {
3758         remove_proc_entry("pfkey", net->proc_net);
3759 }
3760 #else
3761 static inline int pfkey_init_proc(struct net *net)
3762 {
3763         return 0;
3764 }
3765
3766 static inline void pfkey_exit_proc(struct net *net)
3767 {
3768 }
3769 #endif
3770
3771 static struct xfrm_mgr pfkeyv2_mgr =
3772 {
3773         .id             = "pfkeyv2",
3774         .notify         = pfkey_send_notify,
3775         .acquire        = pfkey_send_acquire,
3776         .compile_policy = pfkey_compile_policy,
3777         .new_mapping    = pfkey_send_new_mapping,
3778         .notify_policy  = pfkey_send_policy_notify,
3779         .migrate        = pfkey_send_migrate,
3780 };
3781
3782 static int __net_init pfkey_net_init(struct net *net)
3783 {
3784         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3785         int rv;
3786
3787         INIT_HLIST_HEAD(&net_pfkey->table);
3788         atomic_set(&net_pfkey->socks_nr, 0);
3789
3790         rv = pfkey_init_proc(net);
3791
3792         return rv;
3793 }
3794
3795 static void __net_exit pfkey_net_exit(struct net *net)
3796 {
3797         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3798
3799         pfkey_exit_proc(net);
3800         BUG_ON(!hlist_empty(&net_pfkey->table));
3801 }
3802
3803 static struct pernet_operations pfkey_net_ops = {
3804         .init = pfkey_net_init,
3805         .exit = pfkey_net_exit,
3806         .id   = &pfkey_net_id,
3807         .size = sizeof(struct netns_pfkey),
3808 };
3809
3810 static void __exit ipsec_pfkey_exit(void)
3811 {
3812         xfrm_unregister_km(&pfkeyv2_mgr);
3813         sock_unregister(PF_KEY);
3814         unregister_pernet_subsys(&pfkey_net_ops);
3815         proto_unregister(&key_proto);
3816 }
3817
3818 static int __init ipsec_pfkey_init(void)
3819 {
3820         int err = proto_register(&key_proto, 0);
3821
3822         if (err != 0)
3823                 goto out;
3824
3825         err = register_pernet_subsys(&pfkey_net_ops);
3826         if (err != 0)
3827                 goto out_unregister_key_proto;
3828         err = sock_register(&pfkey_family_ops);
3829         if (err != 0)
3830                 goto out_unregister_pernet;
3831         err = xfrm_register_km(&pfkeyv2_mgr);
3832         if (err != 0)
3833                 goto out_sock_unregister;
3834 out:
3835         return err;
3836
3837 out_sock_unregister:
3838         sock_unregister(PF_KEY);
3839 out_unregister_pernet:
3840         unregister_pernet_subsys(&pfkey_net_ops);
3841 out_unregister_key_proto:
3842         proto_unregister(&key_proto);
3843         goto out;
3844 }
3845
3846 module_init(ipsec_pfkey_init);
3847 module_exit(ipsec_pfkey_exit);
3848 MODULE_LICENSE("GPL");
3849 MODULE_ALIAS_NETPROTO(PF_KEY);