net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <net/net_namespace.h>
  31 #include <net/netns/generic.h>
  32 #include <net/xfrm.h>
  33
  34 #include <net/sock.h>
  35
  36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  38
  39 static int pfkey_net_id __read_mostly;
  40 struct netns_pfkey {
  41         /* List of all pfkey sockets. */
  42         struct hlist_head table;
  43         atomic_t socks_nr;
  44 };
  45 static DEFINE_MUTEX(pfkey_mutex);
  46
  47 #define DUMMY_MARK 0
  48 static 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_pid;
  58                 int             (*dump)(struct pfkey_sock *sk);
  59                 void            (*done)(struct pfkey_sock *sk);
  60                 union {
  61                         struct xfrm_policy_walk policy;
  62                         struct xfrm_state_walk  state;
  63                 } u;
  64                 struct sk_buff  *skb;
  65         } dump;
  66         struct mutex dump_lock;
  67 };
  68
  69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  70 {
  71         return (struct pfkey_sock *)sk;
  72 }
  73
  74 static int pfkey_can_dump(const struct sock *sk)
  75 {
  76         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  77                 return 1;
  78         return 0;
  79 }
  80
  81 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  82 {
  83         if (pfk->dump.dump) {
  84                 if (pfk->dump.skb) {
  85                         kfree_skb(pfk->dump.skb);
  86                         pfk->dump.skb = NULL;
  87                 }
  88                 pfk->dump.done(pfk);
  89                 pfk->dump.dump = NULL;
  90                 pfk->dump.done = NULL;
  91         }
  92 }
  93
  94 static void pfkey_sock_destruct(struct sock *sk)
  95 {
  96         struct net *net = sock_net(sk);
  97         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  98
  99         pfkey_terminate_dump(pfkey_sk(sk));
 100         skb_queue_purge(&sk->sk_receive_queue);
 101
 102         if (!sock_flag(sk, SOCK_DEAD)) {
 103                 pr_err("Attempt to release alive pfkey socket: %p\n", sk);
 104                 return;
 105         }
 106
 107         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 108         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 109
 110         atomic_dec(&net_pfkey->socks_nr);
 111 }
 112
 113 static const struct proto_ops pfkey_ops;
 114
 115 static void pfkey_insert(struct sock *sk)
 116 {
 117         struct net *net = sock_net(sk);
 118         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 119
 120         mutex_lock(&pfkey_mutex);
 121         sk_add_node_rcu(sk, &net_pfkey->table);
 122         mutex_unlock(&pfkey_mutex);
 123 }
 124
 125 static void pfkey_remove(struct sock *sk)
 126 {
 127         mutex_lock(&pfkey_mutex);
 128         sk_del_node_init_rcu(sk);
 129         mutex_unlock(&pfkey_mutex);
 130 }
 131
 132 static struct proto key_proto = {
 133         .name     = "KEY",
 134         .owner    = THIS_MODULE,
 135         .obj_size = sizeof(struct pfkey_sock),
 136 };
 137
 138 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 139                         int kern)
 140 {
 141         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 142         struct sock *sk;
 143         struct pfkey_sock *pfk;
 144         int err;
 145
 146         if (!capable(CAP_NET_ADMIN))
 147                 return -EPERM;
 148         if (sock->type != SOCK_RAW)
 149                 return -ESOCKTNOSUPPORT;
 150         if (protocol != PF_KEY_V2)
 151                 return -EPROTONOSUPPORT;
 152
 153         err = -ENOMEM;
 154         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 155         if (sk == NULL)
 156                 goto out;
 157
 158         pfk = pfkey_sk(sk);
 159         mutex_init(&pfk->dump_lock);
 160
 161         sock->ops = &pfkey_ops;
 162         sock_init_data(sock, sk);
 163
 164         sk->sk_family = PF_KEY;
 165         sk->sk_destruct = pfkey_sock_destruct;
 166
 167         atomic_inc(&net_pfkey->socks_nr);
 168
 169         pfkey_insert(sk);
 170
 171         return 0;
 172 out:
 173         return err;
 174 }
 175
 176 static int pfkey_release(struct socket *sock)
 177 {
 178         struct sock *sk = sock->sk;
 179
 180         if (!sk)
 181                 return 0;
 182
 183         pfkey_remove(sk);
 184
 185         sock_orphan(sk);
 186         sock->sk = NULL;
 187         skb_queue_purge(&sk->sk_write_queue);
 188
 189         synchronize_rcu();
 190         sock_put(sk);
 191
 192         return 0;
 193 }
 194
 195 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 196                                gfp_t allocation, struct sock *sk)
 197 {
 198         int err = -ENOBUFS;
 199
 200         sock_hold(sk);
 201         if (*skb2 == NULL) {
 202                 if (atomic_read(&skb->users) != 1) {
 203                         *skb2 = skb_clone(skb, allocation);
 204                 } else {
 205                         *skb2 = skb;
 206                         atomic_inc(&skb->users);
 207                 }
 208         }
 209         if (*skb2 != NULL) {
 210                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 211                         skb_orphan(*skb2);
 212                         skb_set_owner_r(*skb2, sk);
 213                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 214                         sk->sk_data_ready(sk, (*skb2)->len);
 215                         *skb2 = NULL;
 216                         err = 0;
 217                 }
 218         }
 219         sock_put(sk);
 220         return err;
 221 }
 222
 223 /* Send SKB to all pfkey sockets matching selected criteria.  */
 224 #define BROADCAST_ALL           0
 225 #define BROADCAST_ONE           1
 226 #define BROADCAST_REGISTERED    2
 227 #define BROADCAST_PROMISC_ONLY  4
 228 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 229                            int broadcast_flags, struct sock *one_sk,
 230                            struct net *net)
 231 {
 232         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 233         struct sock *sk;
 234         struct hlist_node *node;
 235         struct sk_buff *skb2 = NULL;
 236         int err = -ESRCH;
 237
 238         /* XXX Do we need something like netlink_overrun?  I think
 239          * XXX PF_KEY socket apps will not mind current behavior.
 240          */
 241         if (!skb)
 242                 return -ENOMEM;
 243
 244         rcu_read_lock();
 245         sk_for_each_rcu(sk, node, &net_pfkey->table) {
 246                 struct pfkey_sock *pfk = pfkey_sk(sk);
 247                 int err2;
 248
 249                 /* Yes, it means that if you are meant to receive this
 250                  * pfkey message you receive it twice as promiscuous
 251                  * socket.
 252                  */
 253                 if (pfk->promisc)
 254                         pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 255
 256                 /* the exact target will be processed later */
 257                 if (sk == one_sk)
 258                         continue;
 259                 if (broadcast_flags != BROADCAST_ALL) {
 260                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 261                                 continue;
 262                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 263                             !pfk->registered)
 264                                 continue;
 265                         if (broadcast_flags & BROADCAST_ONE)
 266                                 continue;
 267                 }
 268
 269                 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk);
 270
 271                 /* Error is cleare after succecful sending to at least one
 272                  * registered KM */
 273                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 274                         err = err2;
 275         }
 276         rcu_read_unlock();
 277
 278         if (one_sk != NULL)
 279                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 280
 281         kfree_skb(skb2);
 282         kfree_skb(skb);
 283         return err;
 284 }
 285
 286 static int pfkey_do_dump(struct pfkey_sock *pfk)
 287 {
 288         struct sadb_msg *hdr;
 289         int rc;
 290
 291         mutex_lock(&pfk->dump_lock);
 292         if (!pfk->dump.dump) {
 293                 rc = 0;
 294                 goto out;
 295         }
 296
 297         rc = pfk->dump.dump(pfk);
 298         if (rc == -ENOBUFS) {
 299                 rc = 0;
 300                 goto out;
 301         }
 302
 303         if (pfk->dump.skb) {
 304                 if (!pfkey_can_dump(&pfk->sk)) {
 305                         rc = 0;
 306                         goto out;
 307                 }
 308
 309                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 310                 hdr->sadb_msg_seq = 0;
 311                 hdr->sadb_msg_errno = rc;
 312                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 313                                 &pfk->sk, sock_net(&pfk->sk));
 314                 pfk->dump.skb = NULL;
 315         }
 316
 317         pfkey_terminate_dump(pfk);
 318
 319 out:
 320         mutex_unlock(&pfk->dump_lock);
 321         return rc;
 322 }
 323
 324 static inline void pfkey_hdr_dup(struct sadb_msg *new,
 325                                  const struct sadb_msg *orig)
 326 {
 327         *new = *orig;
 328 }
 329
 330 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk)
 331 {
 332         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 333         struct sadb_msg *hdr;
 334
 335         if (!skb)
 336                 return -ENOBUFS;
 337
 338         /* Woe be to the platform trying to support PFKEY yet
 339          * having normal errnos outside the 1-255 range, inclusive.
 340          */
 341         err = -err;
 342         if (err == ERESTARTSYS ||
 343             err == ERESTARTNOHAND ||
 344             err == ERESTARTNOINTR)
 345                 err = EINTR;
 346         if (err >= 512)
 347                 err = EINVAL;
 348         BUG_ON(err <= 0 || err >= 256);
 349
 350         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 351         pfkey_hdr_dup(hdr, orig);
 352         hdr->sadb_msg_errno = (uint8_t) err;
 353         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 354                              sizeof(uint64_t));
 355
 356         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 357
 358         return 0;
 359 }
 360
 361 static u8 sadb_ext_min_len[] = {
 362         [SADB_EXT_RESERVED]             = (u8) 0,
 363         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 364         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 365         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 366         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 367         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 368         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 369         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 370         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 371         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 372         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 373         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 374         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 375         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 376         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 377         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 378         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 379         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 380         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 381         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 382         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 383         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 384         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 385         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 386         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 387         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 388 };
 389
 390 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 391 static int verify_address_len(const void *p)
 392 {
 393         const struct sadb_address *sp = p;
 394         const struct sockaddr *addr = (const struct sockaddr *)(sp + 1);
 395         const struct sockaddr_in *sin;
 396 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 397         const struct sockaddr_in6 *sin6;
 398 #endif
 399         int len;
 400
 401         if (sp->sadb_address_len <
 402             DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family),
 403                          sizeof(uint64_t)))
 404                 return -EINVAL;
 405
 406         switch (addr->sa_family) {
 407         case AF_INET:
 408                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 409                 if (sp->sadb_address_len != len ||
 410                     sp->sadb_address_prefixlen > 32)
 411                         return -EINVAL;
 412                 break;
 413 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 414         case AF_INET6:
 415                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 416                 if (sp->sadb_address_len != len ||
 417                     sp->sadb_address_prefixlen > 128)
 418                         return -EINVAL;
 419                 break;
 420 #endif
 421         default:
 422                 /* It is user using kernel to keep track of security
 423                  * associations for another protocol, such as
 424                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 425                  * lengths.
 426                  *
 427                  * XXX Actually, association/policy database is not yet
 428                  * XXX able to cope with arbitrary sockaddr families.
 429                  * XXX When it can, remove this -EINVAL.  -DaveM
 430                  */
 431                 return -EINVAL;
 432                 break;
 433         }
 434
 435         return 0;
 436 }
 437
 438 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx)
 439 {
 440         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 441                             sec_ctx->sadb_x_ctx_len,
 442                             sizeof(uint64_t));
 443 }
 444
 445 static inline int verify_sec_ctx_len(const void *p)
 446 {
 447         const struct sadb_x_sec_ctx *sec_ctx = p;
 448         int len = sec_ctx->sadb_x_ctx_len;
 449
 450         if (len > PAGE_SIZE)
 451                 return -EINVAL;
 452
 453         len = pfkey_sec_ctx_len(sec_ctx);
 454
 455         if (sec_ctx->sadb_x_sec_len != len)
 456                 return -EINVAL;
 457
 458         return 0;
 459 }
 460
 461 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx)
 462 {
 463         struct xfrm_user_sec_ctx *uctx = NULL;
 464         int ctx_size = sec_ctx->sadb_x_ctx_len;
 465
 466         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 467
 468         if (!uctx)
 469                 return NULL;
 470
 471         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 472         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 473         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 474         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 475         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 476         memcpy(uctx + 1, sec_ctx + 1,
 477                uctx->ctx_len);
 478
 479         return uctx;
 480 }
 481
 482 static int present_and_same_family(const struct sadb_address *src,
 483                                    const struct sadb_address *dst)
 484 {
 485         const struct sockaddr *s_addr, *d_addr;
 486
 487         if (!src || !dst)
 488                 return 0;
 489
 490         s_addr = (const struct sockaddr *)(src + 1);
 491         d_addr = (const struct sockaddr *)(dst + 1);
 492         if (s_addr->sa_family != d_addr->sa_family)
 493                 return 0;
 494         if (s_addr->sa_family != AF_INET
 495 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 496             && s_addr->sa_family != AF_INET6
 497 #endif
 498                 )
 499                 return 0;
 500
 501         return 1;
 502 }
 503
 504 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs)
 505 {
 506         const char *p = (char *) hdr;
 507         int len = skb->len;
 508
 509         len -= sizeof(*hdr);
 510         p += sizeof(*hdr);
 511         while (len > 0) {
 512                 const struct sadb_ext *ehdr = (const struct sadb_ext *) p;
 513                 uint16_t ext_type;
 514                 int ext_len;
 515
 516                 if (len < sizeof(*ehdr))
 517                         return -EINVAL;
 518
 519                 ext_len  = ehdr->sadb_ext_len;
 520                 ext_len *= sizeof(uint64_t);
 521                 ext_type = ehdr->sadb_ext_type;
 522                 if (ext_len < sizeof(uint64_t) ||
 523                     ext_len > len ||
 524                     ext_type == SADB_EXT_RESERVED)
 525                         return -EINVAL;
 526
 527                 if (ext_type <= SADB_EXT_MAX) {
 528                         int min = (int) sadb_ext_min_len[ext_type];
 529                         if (ext_len < min)
 530                                 return -EINVAL;
 531                         if (ext_hdrs[ext_type-1] != NULL)
 532                                 return -EINVAL;
 533                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 534                             ext_type == SADB_EXT_ADDRESS_DST ||
 535                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 536                             ext_type == SADB_X_EXT_NAT_T_OA) {
 537                                 if (verify_address_len(p))
 538                                         return -EINVAL;
 539                         }
 540                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 541                                 if (verify_sec_ctx_len(p))
 542                                         return -EINVAL;
 543                         }
 544                         ext_hdrs[ext_type-1] = (void *) p;
 545                 }
 546                 p   += ext_len;
 547                 len -= ext_len;
 548         }
 549
 550         return 0;
 551 }
 552
 553 static uint16_t
 554 pfkey_satype2proto(uint8_t satype)
 555 {
 556         switch (satype) {
 557         case SADB_SATYPE_UNSPEC:
 558                 return IPSEC_PROTO_ANY;
 559         case SADB_SATYPE_AH:
 560                 return IPPROTO_AH;
 561         case SADB_SATYPE_ESP:
 562                 return IPPROTO_ESP;
 563         case SADB_X_SATYPE_IPCOMP:
 564                 return IPPROTO_COMP;
 565                 break;
 566         default:
 567                 return 0;
 568         }
 569         /* NOTREACHED */
 570 }
 571
 572 static uint8_t
 573 pfkey_proto2satype(uint16_t proto)
 574 {
 575         switch (proto) {
 576         case IPPROTO_AH:
 577                 return SADB_SATYPE_AH;
 578         case IPPROTO_ESP:
 579                 return SADB_SATYPE_ESP;
 580         case IPPROTO_COMP:
 581                 return SADB_X_SATYPE_IPCOMP;
 582                 break;
 583         default:
 584                 return 0;
 585         }
 586         /* NOTREACHED */
 587 }
 588
 589 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 590  * say specifically 'just raw sockets' as we encode them as 255.
 591  */
 592
 593 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 594 {
 595         return proto == IPSEC_PROTO_ANY ? 0 : proto;
 596 }
 597
 598 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 599 {
 600         return proto ? proto : IPSEC_PROTO_ANY;
 601 }
 602
 603 static inline int pfkey_sockaddr_len(sa_family_t family)
 604 {
 605         switch (family) {
 606         case AF_INET:
 607                 return sizeof(struct sockaddr_in);
 608 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 609         case AF_INET6:
 610                 return sizeof(struct sockaddr_in6);
 611 #endif
 612         }
 613         return 0;
 614 }
 615
 616 static
 617 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 618 {
 619         switch (sa->sa_family) {
 620         case AF_INET:
 621                 xaddr->a4 =
 622                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 623                 return AF_INET;
 624 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 625         case AF_INET6:
 626                 memcpy(xaddr->a6,
 627                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 628                        sizeof(struct in6_addr));
 629                 return AF_INET6;
 630 #endif
 631         }
 632         return 0;
 633 }
 634
 635 static
 636 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr)
 637 {
 638         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 639                                       xaddr);
 640 }
 641
 642 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs)
 643 {
 644         const struct sadb_sa *sa;
 645         const struct sadb_address *addr;
 646         uint16_t proto;
 647         unsigned short family;
 648         xfrm_address_t *xaddr;
 649
 650         sa = ext_hdrs[SADB_EXT_SA - 1];
 651         if (sa == NULL)
 652                 return NULL;
 653
 654         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 655         if (proto == 0)
 656                 return NULL;
 657
 658         /* sadb_address_len should be checked by caller */
 659         addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1];
 660         if (addr == NULL)
 661                 return NULL;
 662
 663         family = ((const struct sockaddr *)(addr + 1))->sa_family;
 664         switch (family) {
 665         case AF_INET:
 666                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr;
 667                 break;
 668 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 669         case AF_INET6:
 670                 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 671                 break;
 672 #endif
 673         default:
 674                 xaddr = NULL;
 675         }
 676
 677         if (!xaddr)
 678                 return NULL;
 679
 680         return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family);
 681 }
 682
 683 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 684
 685 static int
 686 pfkey_sockaddr_size(sa_family_t family)
 687 {
 688         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 689 }
 690
 691 static inline int pfkey_mode_from_xfrm(int mode)
 692 {
 693         switch(mode) {
 694         case XFRM_MODE_TRANSPORT:
 695                 return IPSEC_MODE_TRANSPORT;
 696         case XFRM_MODE_TUNNEL:
 697                 return IPSEC_MODE_TUNNEL;
 698         case XFRM_MODE_BEET:
 699                 return IPSEC_MODE_BEET;
 700         default:
 701                 return -1;
 702         }
 703 }
 704
 705 static inline int pfkey_mode_to_xfrm(int mode)
 706 {
 707         switch(mode) {
 708         case IPSEC_MODE_ANY:    /*XXX*/
 709         case IPSEC_MODE_TRANSPORT:
 710                 return XFRM_MODE_TRANSPORT;
 711         case IPSEC_MODE_TUNNEL:
 712                 return XFRM_MODE_TUNNEL;
 713         case IPSEC_MODE_BEET:
 714                 return XFRM_MODE_BEET;
 715         default:
 716                 return -1;
 717         }
 718 }
 719
 720 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port,
 721                                         struct sockaddr *sa,
 722                                         unsigned short family)
 723 {
 724         switch (family) {
 725         case AF_INET:
 726             {
 727                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 728                 sin->sin_family = AF_INET;
 729                 sin->sin_port = port;
 730                 sin->sin_addr.s_addr = xaddr->a4;
 731                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 732                 return 32;
 733             }
 734 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 735         case AF_INET6:
 736             {
 737                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 738                 sin6->sin6_family = AF_INET6;
 739                 sin6->sin6_port = port;
 740                 sin6->sin6_flowinfo = 0;
 741                 ipv6_addr_copy(&sin6->sin6_addr, (const struct in6_addr *)xaddr->a6);
 742                 sin6->sin6_scope_id = 0;
 743                 return 128;
 744             }
 745 #endif
 746         }
 747         return 0;
 748 }
 749
 750 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x,
 751                                               int add_keys, int hsc)
 752 {
 753         struct sk_buff *skb;
 754         struct sadb_msg *hdr;
 755         struct sadb_sa *sa;
 756         struct sadb_lifetime *lifetime;
 757         struct sadb_address *addr;
 758         struct sadb_key *key;
 759         struct sadb_x_sa2 *sa2;
 760         struct sadb_x_sec_ctx *sec_ctx;
 761         struct xfrm_sec_ctx *xfrm_ctx;
 762         int ctx_size = 0;
 763         int size;
 764         int auth_key_size = 0;
 765         int encrypt_key_size = 0;
 766         int sockaddr_size;
 767         struct xfrm_encap_tmpl *natt = NULL;
 768         int mode;
 769
 770         /* address family check */
 771         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 772         if (!sockaddr_size)
 773                 return ERR_PTR(-EINVAL);
 774
 775         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 776            key(AE), (identity(SD),) (sensitivity)> */
 777         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 778                 sizeof(struct sadb_lifetime) +
 779                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 780                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 781                         sizeof(struct sadb_address)*2 +
 782                                 sockaddr_size*2 +
 783                                         sizeof(struct sadb_x_sa2);
 784
 785         if ((xfrm_ctx = x->security)) {
 786                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 787                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 788         }
 789
 790         /* identity & sensitivity */
 791         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 792                 size += sizeof(struct sadb_address) + sockaddr_size;
 793
 794         if (add_keys) {
 795                 if (x->aalg && x->aalg->alg_key_len) {
 796                         auth_key_size =
 797                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 798                         size += sizeof(struct sadb_key) + auth_key_size;
 799                 }
 800                 if (x->ealg && x->ealg->alg_key_len) {
 801                         encrypt_key_size =
 802                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 803                         size += sizeof(struct sadb_key) + encrypt_key_size;
 804                 }
 805         }
 806         if (x->encap)
 807                 natt = x->encap;
 808
 809         if (natt && natt->encap_type) {
 810                 size += sizeof(struct sadb_x_nat_t_type);
 811                 size += sizeof(struct sadb_x_nat_t_port);
 812                 size += sizeof(struct sadb_x_nat_t_port);
 813         }
 814
 815         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 816         if (skb == NULL)
 817                 return ERR_PTR(-ENOBUFS);
 818
 819         /* call should fill header later */
 820         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 821         memset(hdr, 0, size);   /* XXX do we need this ? */
 822         hdr->sadb_msg_len = size / sizeof(uint64_t);
 823
 824         /* sa */
 825         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 826         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 827         sa->sadb_sa_exttype = SADB_EXT_SA;
 828         sa->sadb_sa_spi = x->id.spi;
 829         sa->sadb_sa_replay = x->props.replay_window;
 830         switch (x->km.state) {
 831         case XFRM_STATE_VALID:
 832                 sa->sadb_sa_state = x->km.dying ?
 833                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 834                 break;
 835         case XFRM_STATE_ACQ:
 836                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 837                 break;
 838         default:
 839                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 840                 break;
 841         }
 842         sa->sadb_sa_auth = 0;
 843         if (x->aalg) {
 844                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 845                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 846         }
 847         sa->sadb_sa_encrypt = 0;
 848         BUG_ON(x->ealg && x->calg);
 849         if (x->ealg) {
 850                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 851                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 852         }
 853         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 854         if (x->calg) {
 855                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 856                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 857         }
 858
 859         sa->sadb_sa_flags = 0;
 860         if (x->props.flags & XFRM_STATE_NOECN)
 861                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 862         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 863                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 864         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 865                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 866
 867         /* hard time */
 868         if (hsc & 2) {
 869                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 870                                                              sizeof(struct sadb_lifetime));
 871                 lifetime->sadb_lifetime_len =
 872                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 873                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 874                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 875                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 876                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 877                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 878         }
 879         /* soft time */
 880         if (hsc & 1) {
 881                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 882                                                              sizeof(struct sadb_lifetime));
 883                 lifetime->sadb_lifetime_len =
 884                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 885                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 886                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 887                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 888                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 889                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 890         }
 891         /* current time */
 892         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 893                                                      sizeof(struct sadb_lifetime));
 894         lifetime->sadb_lifetime_len =
 895                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 896         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 897         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 898         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 899         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 900         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 901         /* src address */
 902         addr = (struct sadb_address*) skb_put(skb,
 903                                               sizeof(struct sadb_address)+sockaddr_size);
 904         addr->sadb_address_len =
 905                 (sizeof(struct sadb_address)+sockaddr_size)/
 906                         sizeof(uint64_t);
 907         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 908         /* "if the ports are non-zero, then the sadb_address_proto field,
 909            normally zero, MUST be filled in with the transport
 910            protocol's number." - RFC2367 */
 911         addr->sadb_address_proto = 0;
 912         addr->sadb_address_reserved = 0;
 913
 914         addr->sadb_address_prefixlen =
 915                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 916                                     (struct sockaddr *) (addr + 1),
 917                                     x->props.family);
 918         if (!addr->sadb_address_prefixlen)
 919                 BUG();
 920
 921         /* dst address */
 922         addr = (struct sadb_address*) skb_put(skb,
 923                                               sizeof(struct sadb_address)+sockaddr_size);
 924         addr->sadb_address_len =
 925                 (sizeof(struct sadb_address)+sockaddr_size)/
 926                         sizeof(uint64_t);
 927         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 928         addr->sadb_address_proto = 0;
 929         addr->sadb_address_reserved = 0;
 930
 931         addr->sadb_address_prefixlen =
 932                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 933                                     (struct sockaddr *) (addr + 1),
 934                                     x->props.family);
 935         if (!addr->sadb_address_prefixlen)
 936                 BUG();
 937
 938         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 939                           x->props.family)) {
 940                 addr = (struct sadb_address*) skb_put(skb,
 941                         sizeof(struct sadb_address)+sockaddr_size);
 942                 addr->sadb_address_len =
 943                         (sizeof(struct sadb_address)+sockaddr_size)/
 944                         sizeof(uint64_t);
 945                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 946                 addr->sadb_address_proto =
 947                         pfkey_proto_from_xfrm(x->sel.proto);
 948                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 949                 addr->sadb_address_reserved = 0;
 950
 951                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 952                                     (struct sockaddr *) (addr + 1),
 953                                     x->props.family);
 954         }
 955
 956         /* auth key */
 957         if (add_keys && auth_key_size) {
 958                 key = (struct sadb_key *) skb_put(skb,
 959                                                   sizeof(struct sadb_key)+auth_key_size);
 960                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 961                         sizeof(uint64_t);
 962                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 963                 key->sadb_key_bits = x->aalg->alg_key_len;
 964                 key->sadb_key_reserved = 0;
 965                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 966         }
 967         /* encrypt key */
 968         if (add_keys && encrypt_key_size) {
 969                 key = (struct sadb_key *) skb_put(skb,
 970                                                   sizeof(struct sadb_key)+encrypt_key_size);
 971                 key->sadb_key_len = (sizeof(struct sadb_key) +
 972                                      encrypt_key_size) / sizeof(uint64_t);
 973                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 974                 key->sadb_key_bits = x->ealg->alg_key_len;
 975                 key->sadb_key_reserved = 0;
 976                 memcpy(key + 1, x->ealg->alg_key,
 977                        (x->ealg->alg_key_len+7)/8);
 978         }
 979
 980         /* sa */
 981         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 982         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 983         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 984         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 985                 kfree_skb(skb);
 986                 return ERR_PTR(-EINVAL);
 987         }
 988         sa2->sadb_x_sa2_mode = mode;
 989         sa2->sadb_x_sa2_reserved1 = 0;
 990         sa2->sadb_x_sa2_reserved2 = 0;
 991         sa2->sadb_x_sa2_sequence = 0;
 992         sa2->sadb_x_sa2_reqid = x->props.reqid;
 993
 994         if (natt && natt->encap_type) {
 995                 struct sadb_x_nat_t_type *n_type;
 996                 struct sadb_x_nat_t_port *n_port;
 997
 998                 /* type */
 999                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1000                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1001                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1002                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1003                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1004                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1005                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1006
1007                 /* source port */
1008                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1009                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1010                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1011                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1012                 n_port->sadb_x_nat_t_port_reserved = 0;
1013
1014                 /* dest port */
1015                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1016                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1017                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1018                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1019                 n_port->sadb_x_nat_t_port_reserved = 0;
1020         }
1021
1022         /* security context */
1023         if (xfrm_ctx) {
1024                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1025                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1026                 sec_ctx->sadb_x_sec_len =
1027                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1028                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1029                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1030                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1031                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1032                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1033                        xfrm_ctx->ctx_len);
1034         }
1035
1036         return skb;
1037 }
1038
1039
1040 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x)
1041 {
1042         struct sk_buff *skb;
1043
1044         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1045
1046         return skb;
1047 }
1048
1049 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x,
1050                                                           int hsc)
1051 {
1052         return __pfkey_xfrm_state2msg(x, 0, hsc);
1053 }
1054
1055 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1056                                                 const struct sadb_msg *hdr,
1057                                                 void * const *ext_hdrs)
1058 {
1059         struct xfrm_state *x;
1060         const struct sadb_lifetime *lifetime;
1061         const struct sadb_sa *sa;
1062         const struct sadb_key *key;
1063         const struct sadb_x_sec_ctx *sec_ctx;
1064         uint16_t proto;
1065         int err;
1066
1067
1068         sa = ext_hdrs[SADB_EXT_SA - 1];
1069         if (!sa ||
1070             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1071                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1072                 return ERR_PTR(-EINVAL);
1073         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1074             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1075                 return ERR_PTR(-EINVAL);
1076         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1077             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1078                 return ERR_PTR(-EINVAL);
1079         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1080             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1081                 return ERR_PTR(-EINVAL);
1082
1083         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1084         if (proto == 0)
1085                 return ERR_PTR(-EINVAL);
1086
1087         /* default error is no buffer space */
1088         err = -ENOBUFS;
1089
1090         /* RFC2367:
1091
1092    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1093    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1094    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1095    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1096    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1097    not true.
1098
1099            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1100            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1101          */
1102         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1103             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1104              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1105             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1106                 return ERR_PTR(-EINVAL);
1107         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1108         if (key != NULL &&
1109             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1110             ((key->sadb_key_bits+7) / 8 == 0 ||
1111              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1112                 return ERR_PTR(-EINVAL);
1113         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1114         if (key != NULL &&
1115             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1116             ((key->sadb_key_bits+7) / 8 == 0 ||
1117              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1118                 return ERR_PTR(-EINVAL);
1119
1120         x = xfrm_state_alloc(net);
1121         if (x == NULL)
1122                 return ERR_PTR(-ENOBUFS);
1123
1124         x->id.proto = proto;
1125         x->id.spi = sa->sadb_sa_spi;
1126         x->props.replay_window = sa->sadb_sa_replay;
1127         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1128                 x->props.flags |= XFRM_STATE_NOECN;
1129         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1130                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1131         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1132                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1133
1134         lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1];
1135         if (lifetime != NULL) {
1136                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1137                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1138                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1139                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1140         }
1141         lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1];
1142         if (lifetime != NULL) {
1143                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1144                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1145                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1146                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1147         }
1148
1149         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
1150         if (sec_ctx != NULL) {
1151                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1152
1153                 if (!uctx)
1154                         goto out;
1155
1156                 err = security_xfrm_state_alloc(x, uctx);
1157                 kfree(uctx);
1158
1159                 if (err)
1160                         goto out;
1161         }
1162
1163         err = -ENOBUFS;
1164         key = ext_hdrs[SADB_EXT_KEY_AUTH - 1];
1165         if (sa->sadb_sa_auth) {
1166                 int keysize = 0;
1167                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1168                 if (!a) {
1169                         err = -ENOSYS;
1170                         goto out;
1171                 }
1172                 if (key)
1173                         keysize = (key->sadb_key_bits + 7) / 8;
1174                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1175                 if (!x->aalg) {
1176                         err = -ENOMEM;
1177                         goto out;
1178                 }
1179                 strcpy(x->aalg->alg_name, a->name);
1180                 x->aalg->alg_key_len = 0;
1181                 if (key) {
1182                         x->aalg->alg_key_len = key->sadb_key_bits;
1183                         memcpy(x->aalg->alg_key, key+1, keysize);
1184                 }
1185                 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits;
1186                 x->props.aalgo = sa->sadb_sa_auth;
1187                 /* x->algo.flags = sa->sadb_sa_flags; */
1188         }
1189         if (sa->sadb_sa_encrypt) {
1190                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1191                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1192                         if (!a) {
1193                                 err = -ENOSYS;
1194                                 goto out;
1195                         }
1196                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1197                         if (!x->calg) {
1198                                 err = -ENOMEM;
1199                                 goto out;
1200                         }
1201                         strcpy(x->calg->alg_name, a->name);
1202                         x->props.calgo = sa->sadb_sa_encrypt;
1203                 } else {
1204                         int keysize = 0;
1205                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1206                         if (!a) {
1207                                 err = -ENOSYS;
1208                                 goto out;
1209                         }
1210                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1211                         if (key)
1212                                 keysize = (key->sadb_key_bits + 7) / 8;
1213                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1214                         if (!x->ealg) {
1215                                 err = -ENOMEM;
1216                                 goto out;
1217                         }
1218                         strcpy(x->ealg->alg_name, a->name);
1219                         x->ealg->alg_key_len = 0;
1220                         if (key) {
1221                                 x->ealg->alg_key_len = key->sadb_key_bits;
1222                                 memcpy(x->ealg->alg_key, key+1, keysize);
1223                         }
1224                         x->props.ealgo = sa->sadb_sa_encrypt;
1225                 }
1226         }
1227         /* x->algo.flags = sa->sadb_sa_flags; */
1228
1229         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1230                                                     &x->props.saddr);
1231         if (!x->props.family) {
1232                 err = -EAFNOSUPPORT;
1233                 goto out;
1234         }
1235         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1236                                   &x->id.daddr);
1237
1238         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1239                 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1];
1240                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1241                 if (mode < 0) {
1242                         err = -EINVAL;
1243                         goto out;
1244                 }
1245                 x->props.mode = mode;
1246                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1247         }
1248
1249         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1250                 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1251
1252                 /* Nobody uses this, but we try. */
1253                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1254                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1255         }
1256
1257         if (!x->sel.family)
1258                 x->sel.family = x->props.family;
1259
1260         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1261                 const struct sadb_x_nat_t_type* n_type;
1262                 struct xfrm_encap_tmpl *natt;
1263
1264                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1265                 if (!x->encap) {
1266                         err = -ENOMEM;
1267                         goto out;
1268                 }
1269
1270                 natt = x->encap;
1271                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1272                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1273
1274                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1275                         const struct sadb_x_nat_t_port *n_port =
1276                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1277                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1278                 }
1279                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1280                         const struct sadb_x_nat_t_port *n_port =
1281                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1282                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1283                 }
1284                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1285         }
1286
1287         err = xfrm_init_state(x);
1288         if (err)
1289                 goto out;
1290
1291         x->km.seq = hdr->sadb_msg_seq;
1292         return x;
1293
1294 out:
1295         x->km.state = XFRM_STATE_DEAD;
1296         xfrm_state_put(x);
1297         return ERR_PTR(err);
1298 }
1299
1300 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1301 {
1302         return -EOPNOTSUPP;
1303 }
1304
1305 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1306 {
1307         struct net *net = sock_net(sk);
1308         struct sk_buff *resp_skb;
1309         struct sadb_x_sa2 *sa2;
1310         struct sadb_address *saddr, *daddr;
1311         struct sadb_msg *out_hdr;
1312         struct sadb_spirange *range;
1313         struct xfrm_state *x = NULL;
1314         int mode;
1315         int err;
1316         u32 min_spi, max_spi;
1317         u32 reqid;
1318         u8 proto;
1319         unsigned short family;
1320         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1321
1322         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1323                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1324                 return -EINVAL;
1325
1326         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1327         if (proto == 0)
1328                 return -EINVAL;
1329
1330         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1331                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1332                 if (mode < 0)
1333                         return -EINVAL;
1334                 reqid = sa2->sadb_x_sa2_reqid;
1335         } else {
1336                 mode = 0;
1337                 reqid = 0;
1338         }
1339
1340         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1341         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1342
1343         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1344         switch (family) {
1345         case AF_INET:
1346                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1347                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1348                 break;
1349 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1350         case AF_INET6:
1351                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1352                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1353                 break;
1354 #endif
1355         }
1356
1357         if (hdr->sadb_msg_seq) {
1358                 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1359                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1360                         xfrm_state_put(x);
1361                         x = NULL;
1362                 }
1363         }
1364
1365         if (!x)
1366                 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1367
1368         if (x == NULL)
1369                 return -ENOENT;
1370
1371         min_spi = 0x100;
1372         max_spi = 0x0fffffff;
1373
1374         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1375         if (range) {
1376                 min_spi = range->sadb_spirange_min;
1377                 max_spi = range->sadb_spirange_max;
1378         }
1379
1380         err = xfrm_alloc_spi(x, min_spi, max_spi);
1381         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1382
1383         if (IS_ERR(resp_skb)) {
1384                 xfrm_state_put(x);
1385                 return  PTR_ERR(resp_skb);
1386         }
1387
1388         out_hdr = (struct sadb_msg *) resp_skb->data;
1389         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1390         out_hdr->sadb_msg_type = SADB_GETSPI;
1391         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1392         out_hdr->sadb_msg_errno = 0;
1393         out_hdr->sadb_msg_reserved = 0;
1394         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1395         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1396
1397         xfrm_state_put(x);
1398
1399         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1400
1401         return 0;
1402 }
1403
1404 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1405 {
1406         struct net *net = sock_net(sk);
1407         struct xfrm_state *x;
1408
1409         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1410                 return -EOPNOTSUPP;
1411
1412         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1413                 return 0;
1414
1415         x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq);
1416         if (x == NULL)
1417                 return 0;
1418
1419         spin_lock_bh(&x->lock);
1420         if (x->km.state == XFRM_STATE_ACQ) {
1421                 x->km.state = XFRM_STATE_ERROR;
1422                 wake_up(&net->xfrm.km_waitq);
1423         }
1424         spin_unlock_bh(&x->lock);
1425         xfrm_state_put(x);
1426         return 0;
1427 }
1428
1429 static inline int event2poltype(int event)
1430 {
1431         switch (event) {
1432         case XFRM_MSG_DELPOLICY:
1433                 return SADB_X_SPDDELETE;
1434         case XFRM_MSG_NEWPOLICY:
1435                 return SADB_X_SPDADD;
1436         case XFRM_MSG_UPDPOLICY:
1437                 return SADB_X_SPDUPDATE;
1438         case XFRM_MSG_POLEXPIRE:
1439         //      return SADB_X_SPDEXPIRE;
1440         default:
1441                 pr_err("pfkey: Unknown policy event %d\n", event);
1442                 break;
1443         }
1444
1445         return 0;
1446 }
1447
1448 static inline int event2keytype(int event)
1449 {
1450         switch (event) {
1451         case XFRM_MSG_DELSA:
1452                 return SADB_DELETE;
1453         case XFRM_MSG_NEWSA:
1454                 return SADB_ADD;
1455         case XFRM_MSG_UPDSA:
1456                 return SADB_UPDATE;
1457         case XFRM_MSG_EXPIRE:
1458                 return SADB_EXPIRE;
1459         default:
1460                 pr_err("pfkey: Unknown SA event %d\n", event);
1461                 break;
1462         }
1463
1464         return 0;
1465 }
1466
1467 /* ADD/UPD/DEL */
1468 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c)
1469 {
1470         struct sk_buff *skb;
1471         struct sadb_msg *hdr;
1472
1473         skb = pfkey_xfrm_state2msg(x);
1474
1475         if (IS_ERR(skb))
1476                 return PTR_ERR(skb);
1477
1478         hdr = (struct sadb_msg *) skb->data;
1479         hdr->sadb_msg_version = PF_KEY_V2;
1480         hdr->sadb_msg_type = event2keytype(c->event);
1481         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1482         hdr->sadb_msg_errno = 0;
1483         hdr->sadb_msg_reserved = 0;
1484         hdr->sadb_msg_seq = c->seq;
1485         hdr->sadb_msg_pid = c->pid;
1486
1487         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1488
1489         return 0;
1490 }
1491
1492 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1493 {
1494         struct net *net = sock_net(sk);
1495         struct xfrm_state *x;
1496         int err;
1497         struct km_event c;
1498
1499         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1500         if (IS_ERR(x))
1501                 return PTR_ERR(x);
1502
1503         xfrm_state_hold(x);
1504         if (hdr->sadb_msg_type == SADB_ADD)
1505                 err = xfrm_state_add(x);
1506         else
1507                 err = xfrm_state_update(x);
1508
1509         xfrm_audit_state_add(x, err ? 0 : 1,
1510                              audit_get_loginuid(current),
1511                              audit_get_sessionid(current), 0);
1512
1513         if (err < 0) {
1514                 x->km.state = XFRM_STATE_DEAD;
1515                 __xfrm_state_put(x);
1516                 goto out;
1517         }
1518
1519         if (hdr->sadb_msg_type == SADB_ADD)
1520                 c.event = XFRM_MSG_NEWSA;
1521         else
1522                 c.event = XFRM_MSG_UPDSA;
1523         c.seq = hdr->sadb_msg_seq;
1524         c.pid = hdr->sadb_msg_pid;
1525         km_state_notify(x, &c);
1526 out:
1527         xfrm_state_put(x);
1528         return err;
1529 }
1530
1531 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1532 {
1533         struct net *net = sock_net(sk);
1534         struct xfrm_state *x;
1535         struct km_event c;
1536         int err;
1537
1538         if (!ext_hdrs[SADB_EXT_SA-1] ||
1539             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1540                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1541                 return -EINVAL;
1542
1543         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1544         if (x == NULL)
1545                 return -ESRCH;
1546
1547         if ((err = security_xfrm_state_delete(x)))
1548                 goto out;
1549
1550         if (xfrm_state_kern(x)) {
1551                 err = -EPERM;
1552                 goto out;
1553         }
1554
1555         err = xfrm_state_delete(x);
1556
1557         if (err < 0)
1558                 goto out;
1559
1560         c.seq = hdr->sadb_msg_seq;
1561         c.pid = hdr->sadb_msg_pid;
1562         c.event = XFRM_MSG_DELSA;
1563         km_state_notify(x, &c);
1564 out:
1565         xfrm_audit_state_delete(x, err ? 0 : 1,
1566                                 audit_get_loginuid(current),
1567                                 audit_get_sessionid(current), 0);
1568         xfrm_state_put(x);
1569
1570         return err;
1571 }
1572
1573 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1574 {
1575         struct net *net = sock_net(sk);
1576         __u8 proto;
1577         struct sk_buff *out_skb;
1578         struct sadb_msg *out_hdr;
1579         struct xfrm_state *x;
1580
1581         if (!ext_hdrs[SADB_EXT_SA-1] ||
1582             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1583                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1584                 return -EINVAL;
1585
1586         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1587         if (x == NULL)
1588                 return -ESRCH;
1589
1590         out_skb = pfkey_xfrm_state2msg(x);
1591         proto = x->id.proto;
1592         xfrm_state_put(x);
1593         if (IS_ERR(out_skb))
1594                 return  PTR_ERR(out_skb);
1595
1596         out_hdr = (struct sadb_msg *) out_skb->data;
1597         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1598         out_hdr->sadb_msg_type = SADB_GET;
1599         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1600         out_hdr->sadb_msg_errno = 0;
1601         out_hdr->sadb_msg_reserved = 0;
1602         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1603         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1604         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1605
1606         return 0;
1607 }
1608
1609 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig,
1610                                               gfp_t allocation)
1611 {
1612         struct sk_buff *skb;
1613         struct sadb_msg *hdr;
1614         int len, auth_len, enc_len, i;
1615
1616         auth_len = xfrm_count_auth_supported();
1617         if (auth_len) {
1618                 auth_len *= sizeof(struct sadb_alg);
1619                 auth_len += sizeof(struct sadb_supported);
1620         }
1621
1622         enc_len = xfrm_count_enc_supported();
1623         if (enc_len) {
1624                 enc_len *= sizeof(struct sadb_alg);
1625                 enc_len += sizeof(struct sadb_supported);
1626         }
1627
1628         len = enc_len + auth_len + sizeof(struct sadb_msg);
1629
1630         skb = alloc_skb(len + 16, allocation);
1631         if (!skb)
1632                 goto out_put_algs;
1633
1634         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1635         pfkey_hdr_dup(hdr, orig);
1636         hdr->sadb_msg_errno = 0;
1637         hdr->sadb_msg_len = len / sizeof(uint64_t);
1638
1639         if (auth_len) {
1640                 struct sadb_supported *sp;
1641                 struct sadb_alg *ap;
1642
1643                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1644                 ap = (struct sadb_alg *) (sp + 1);
1645
1646                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1647                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1648
1649                 for (i = 0; ; i++) {
1650                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1651                         if (!aalg)
1652                                 break;
1653                         if (aalg->available)
1654                                 *ap++ = aalg->desc;
1655                 }
1656         }
1657
1658         if (enc_len) {
1659                 struct sadb_supported *sp;
1660                 struct sadb_alg *ap;
1661
1662                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1663                 ap = (struct sadb_alg *) (sp + 1);
1664
1665                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1666                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1667
1668                 for (i = 0; ; i++) {
1669                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1670                         if (!ealg)
1671                                 break;
1672                         if (ealg->available)
1673                                 *ap++ = ealg->desc;
1674                 }
1675         }
1676
1677 out_put_algs:
1678         return skb;
1679 }
1680
1681 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1682 {
1683         struct pfkey_sock *pfk = pfkey_sk(sk);
1684         struct sk_buff *supp_skb;
1685
1686         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1687                 return -EINVAL;
1688
1689         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1690                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1691                         return -EEXIST;
1692                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1693         }
1694
1695         xfrm_probe_algs();
1696
1697         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1698         if (!supp_skb) {
1699                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1700                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1701
1702                 return -ENOBUFS;
1703         }
1704
1705         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk,
1706                         sock_net(sk));
1707         return 0;
1708 }
1709
1710 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr)
1711 {
1712         struct sk_buff *skb;
1713         struct sadb_msg *hdr;
1714
1715         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1716         if (!skb)
1717                 return -ENOBUFS;
1718
1719         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1720         memcpy(hdr, ihdr, sizeof(struct sadb_msg));
1721         hdr->sadb_msg_errno = (uint8_t) 0;
1722         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1723
1724         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk,
1725                                sock_net(sk));
1726 }
1727
1728 static int key_notify_sa_flush(const struct km_event *c)
1729 {
1730         struct sk_buff *skb;
1731         struct sadb_msg *hdr;
1732
1733         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1734         if (!skb)
1735                 return -ENOBUFS;
1736         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1737         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1738         hdr->sadb_msg_type = SADB_FLUSH;
1739         hdr->sadb_msg_seq = c->seq;
1740         hdr->sadb_msg_pid = c->pid;
1741         hdr->sadb_msg_version = PF_KEY_V2;
1742         hdr->sadb_msg_errno = (uint8_t) 0;
1743         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1744         hdr->sadb_msg_reserved = 0;
1745
1746         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1747
1748         return 0;
1749 }
1750
1751 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1752 {
1753         struct net *net = sock_net(sk);
1754         unsigned proto;
1755         struct km_event c;
1756         struct xfrm_audit audit_info;
1757         int err, err2;
1758
1759         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1760         if (proto == 0)
1761                 return -EINVAL;
1762
1763         audit_info.loginuid = audit_get_loginuid(current);
1764         audit_info.sessionid = audit_get_sessionid(current);
1765         audit_info.secid = 0;
1766         err = xfrm_state_flush(net, proto, &audit_info);
1767         err2 = unicast_flush_resp(sk, hdr);
1768         if (err || err2) {
1769                 if (err == -ESRCH) /* empty table - go quietly */
1770                         err = 0;
1771                 return err ? err : err2;
1772         }
1773
1774         c.data.proto = proto;
1775         c.seq = hdr->sadb_msg_seq;
1776         c.pid = hdr->sadb_msg_pid;
1777         c.event = XFRM_MSG_FLUSHSA;
1778         c.net = net;
1779         km_state_notify(NULL, &c);
1780
1781         return 0;
1782 }
1783
1784 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1785 {
1786         struct pfkey_sock *pfk = ptr;
1787         struct sk_buff *out_skb;
1788         struct sadb_msg *out_hdr;
1789
1790         if (!pfkey_can_dump(&pfk->sk))
1791                 return -ENOBUFS;
1792
1793         out_skb = pfkey_xfrm_state2msg(x);
1794         if (IS_ERR(out_skb))
1795                 return PTR_ERR(out_skb);
1796
1797         out_hdr = (struct sadb_msg *) out_skb->data;
1798         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1799         out_hdr->sadb_msg_type = SADB_DUMP;
1800         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1801         out_hdr->sadb_msg_errno = 0;
1802         out_hdr->sadb_msg_reserved = 0;
1803         out_hdr->sadb_msg_seq = count + 1;
1804         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1805
1806         if (pfk->dump.skb)
1807                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1808                                 &pfk->sk, sock_net(&pfk->sk));
1809         pfk->dump.skb = out_skb;
1810
1811         return 0;
1812 }
1813
1814 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1815 {
1816         struct net *net = sock_net(&pfk->sk);
1817         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1818 }
1819
1820 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1821 {
1822         xfrm_state_walk_done(&pfk->dump.u.state);
1823 }
1824
1825 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1826 {
1827         u8 proto;
1828         struct pfkey_sock *pfk = pfkey_sk(sk);
1829
1830         mutex_lock(&pfk->dump_lock);
1831         if (pfk->dump.dump != NULL) {
1832                 mutex_unlock(&pfk->dump_lock);
1833                 return -EBUSY;
1834         }
1835
1836         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1837         if (proto == 0) {
1838                 mutex_unlock(&pfk->dump_lock);
1839                 return -EINVAL;
1840         }
1841
1842         pfk->dump.msg_version = hdr->sadb_msg_version;
1843         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1844         pfk->dump.dump = pfkey_dump_sa;
1845         pfk->dump.done = pfkey_dump_sa_done;
1846         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1847         mutex_unlock(&pfk->dump_lock);
1848
1849         return pfkey_do_dump(pfk);
1850 }
1851
1852 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
1853 {
1854         struct pfkey_sock *pfk = pfkey_sk(sk);
1855         int satype = hdr->sadb_msg_satype;
1856         bool reset_errno = false;
1857
1858         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1859                 reset_errno = true;
1860                 if (satype != 0 && satype != 1)
1861                         return -EINVAL;
1862                 pfk->promisc = satype;
1863         }
1864         if (reset_errno && skb_cloned(skb))
1865                 skb = skb_copy(skb, GFP_KERNEL);
1866         else
1867                 skb = skb_clone(skb, GFP_KERNEL);
1868
1869         if (reset_errno && skb) {
1870                 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data;
1871                 new_hdr->sadb_msg_errno = 0;
1872         }
1873
1874         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1875         return 0;
1876 }
1877
1878 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1879 {
1880         int i;
1881         u32 reqid = *(u32*)ptr;
1882
1883         for (i=0; i<xp->xfrm_nr; i++) {
1884                 if (xp->xfrm_vec[i].reqid == reqid)
1885                         return -EEXIST;
1886         }
1887         return 0;
1888 }
1889
1890 static u32 gen_reqid(struct net *net)
1891 {
1892         struct xfrm_policy_walk walk;
1893         u32 start;
1894         int rc;
1895         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1896
1897         start = reqid;
1898         do {
1899                 ++reqid;
1900                 if (reqid == 0)
1901                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1902                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1903                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1904                 xfrm_policy_walk_done(&walk);
1905                 if (rc != -EEXIST)
1906                         return reqid;
1907         } while (reqid != start);
1908         return 0;
1909 }
1910
1911 static int
1912 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1913 {
1914         struct net *net = xp_net(xp);
1915         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1916         int mode;
1917
1918         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1919                 return -ELOOP;
1920
1921         if (rq->sadb_x_ipsecrequest_mode == 0)
1922                 return -EINVAL;
1923
1924         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1925         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1926                 return -EINVAL;
1927         t->mode = mode;
1928         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1929                 t->optional = 1;
1930         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1931                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1932                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1933                         t->reqid = 0;
1934                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1935                         return -ENOBUFS;
1936         }
1937
1938         /* addresses present only in tunnel mode */
1939         if (t->mode == XFRM_MODE_TUNNEL) {
1940                 u8 *sa = (u8 *) (rq + 1);
1941                 int family, socklen;
1942
1943                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1944                                                 &t->saddr);
1945                 if (!family)
1946                         return -EINVAL;
1947
1948                 socklen = pfkey_sockaddr_len(family);
1949                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1950                                            &t->id.daddr) != family)
1951                         return -EINVAL;
1952                 t->encap_family = family;
1953         } else
1954                 t->encap_family = xp->family;
1955
1956         /* No way to set this via kame pfkey */
1957         t->allalgs = 1;
1958         xp->xfrm_nr++;
1959         return 0;
1960 }
1961
1962 static int
1963 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1964 {
1965         int err;
1966         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1967         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1968
1969         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1970                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1971                         return err;
1972                 len -= rq->sadb_x_ipsecrequest_len;
1973                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1974         }
1975         return 0;
1976 }
1977
1978 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp)
1979 {
1980   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1981
1982         if (xfrm_ctx) {
1983                 int len = sizeof(struct sadb_x_sec_ctx);
1984                 len += xfrm_ctx->ctx_len;
1985                 return PFKEY_ALIGN8(len);
1986         }
1987         return 0;
1988 }
1989
1990 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp)
1991 {
1992         const struct xfrm_tmpl *t;
1993         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1994         int socklen = 0;
1995         int i;
1996
1997         for (i=0; i<xp->xfrm_nr; i++) {
1998                 t = xp->xfrm_vec + i;
1999                 socklen += pfkey_sockaddr_len(t->encap_family);
2000         }
2001
2002         return sizeof(struct sadb_msg) +
2003                 (sizeof(struct sadb_lifetime) * 3) +
2004                 (sizeof(struct sadb_address) * 2) +
2005                 (sockaddr_size * 2) +
2006                 sizeof(struct sadb_x_policy) +
2007                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
2008                 (socklen * 2) +
2009                 pfkey_xfrm_policy2sec_ctx_size(xp);
2010 }
2011
2012 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp)
2013 {
2014         struct sk_buff *skb;
2015         int size;
2016
2017         size = pfkey_xfrm_policy2msg_size(xp);
2018
2019         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2020         if (skb == NULL)
2021                 return ERR_PTR(-ENOBUFS);
2022
2023         return skb;
2024 }
2025
2026 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir)
2027 {
2028         struct sadb_msg *hdr;
2029         struct sadb_address *addr;
2030         struct sadb_lifetime *lifetime;
2031         struct sadb_x_policy *pol;
2032         struct sadb_x_sec_ctx *sec_ctx;
2033         struct xfrm_sec_ctx *xfrm_ctx;
2034         int i;
2035         int size;
2036         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2037         int socklen = pfkey_sockaddr_len(xp->family);
2038
2039         size = pfkey_xfrm_policy2msg_size(xp);
2040
2041         /* call should fill header later */
2042         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2043         memset(hdr, 0, size);   /* XXX do we need this ? */
2044
2045         /* src address */
2046         addr = (struct sadb_address*) skb_put(skb,
2047                                               sizeof(struct sadb_address)+sockaddr_size);
2048         addr->sadb_address_len =
2049                 (sizeof(struct sadb_address)+sockaddr_size)/
2050                         sizeof(uint64_t);
2051         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2052         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2053         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2054         addr->sadb_address_reserved = 0;
2055         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2056                                  xp->selector.sport,
2057                                  (struct sockaddr *) (addr + 1),
2058                                  xp->family))
2059                 BUG();
2060
2061         /* dst address */
2062         addr = (struct sadb_address*) skb_put(skb,
2063                                               sizeof(struct sadb_address)+sockaddr_size);
2064         addr->sadb_address_len =
2065                 (sizeof(struct sadb_address)+sockaddr_size)/
2066                         sizeof(uint64_t);
2067         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2068         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2069         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2070         addr->sadb_address_reserved = 0;
2071
2072         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2073                             (struct sockaddr *) (addr + 1),
2074                             xp->family);
2075
2076         /* hard time */
2077         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2078                                                      sizeof(struct sadb_lifetime));
2079         lifetime->sadb_lifetime_len =
2080                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2081         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2082         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2083         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2084         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2085         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2086         /* soft time */
2087         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2088                                                      sizeof(struct sadb_lifetime));
2089         lifetime->sadb_lifetime_len =
2090                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2091         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2092         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2093         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2094         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2095         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2096         /* current time */
2097         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2098                                                      sizeof(struct sadb_lifetime));
2099         lifetime->sadb_lifetime_len =
2100                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2101         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2102         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2103         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2104         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2105         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2106
2107         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2108         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2109         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2110         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2111         if (xp->action == XFRM_POLICY_ALLOW) {
2112                 if (xp->xfrm_nr)
2113                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2114                 else
2115                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2116         }
2117         pol->sadb_x_policy_dir = dir+1;
2118         pol->sadb_x_policy_reserved = 0;
2119         pol->sadb_x_policy_id = xp->index;
2120         pol->sadb_x_policy_priority = xp->priority;
2121
2122         for (i=0; i<xp->xfrm_nr; i++) {
2123                 const struct xfrm_tmpl *t = xp->xfrm_vec + i;
2124                 struct sadb_x_ipsecrequest *rq;
2125                 int req_size;
2126                 int mode;
2127
2128                 req_size = sizeof(struct sadb_x_ipsecrequest);
2129                 if (t->mode == XFRM_MODE_TUNNEL) {
2130                         socklen = pfkey_sockaddr_len(t->encap_family);
2131                         req_size += socklen * 2;
2132                 } else {
2133                         size -= 2*socklen;
2134                 }
2135                 rq = (void*)skb_put(skb, req_size);
2136                 pol->sadb_x_policy_len += req_size/8;
2137                 memset(rq, 0, sizeof(*rq));
2138                 rq->sadb_x_ipsecrequest_len = req_size;
2139                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2140                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2141                         return -EINVAL;
2142                 rq->sadb_x_ipsecrequest_mode = mode;
2143                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2144                 if (t->reqid)
2145                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2146                 if (t->optional)
2147                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2148                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2149
2150                 if (t->mode == XFRM_MODE_TUNNEL) {
2151                         u8 *sa = (void *)(rq + 1);
2152                         pfkey_sockaddr_fill(&t->saddr, 0,
2153                                             (struct sockaddr *)sa,
2154                                             t->encap_family);
2155                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2156                                             (struct sockaddr *) (sa + socklen),
2157                                             t->encap_family);
2158                 }
2159         }
2160
2161         /* security context */
2162         if ((xfrm_ctx = xp->security)) {
2163                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2164
2165                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2166                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2167                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2168                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2169                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2170                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2171                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2172                        xfrm_ctx->ctx_len);
2173         }
2174
2175         hdr->sadb_msg_len = size / sizeof(uint64_t);
2176         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2177
2178         return 0;
2179 }
2180
2181 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2182 {
2183         struct sk_buff *out_skb;
2184         struct sadb_msg *out_hdr;
2185         int err;
2186
2187         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2188         if (IS_ERR(out_skb))
2189                 return PTR_ERR(out_skb);
2190
2191         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2192         if (err < 0)
2193                 return err;
2194
2195         out_hdr = (struct sadb_msg *) out_skb->data;
2196         out_hdr->sadb_msg_version = PF_KEY_V2;
2197
2198         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2199                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2200         else
2201                 out_hdr->sadb_msg_type = event2poltype(c->event);
2202         out_hdr->sadb_msg_errno = 0;
2203         out_hdr->sadb_msg_seq = c->seq;
2204         out_hdr->sadb_msg_pid = c->pid;
2205         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2206         return 0;
2207
2208 }
2209
2210 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2211 {
2212         struct net *net = sock_net(sk);
2213         int err = 0;
2214         struct sadb_lifetime *lifetime;
2215         struct sadb_address *sa;
2216         struct sadb_x_policy *pol;
2217         struct xfrm_policy *xp;
2218         struct km_event c;
2219         struct sadb_x_sec_ctx *sec_ctx;
2220
2221         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2222                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2223             !ext_hdrs[SADB_X_EXT_POLICY-1])
2224                 return -EINVAL;
2225
2226         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2227         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2228                 return -EINVAL;
2229         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2230                 return -EINVAL;
2231
2232         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2233         if (xp == NULL)
2234                 return -ENOBUFS;
2235
2236         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2237                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2238         xp->priority = pol->sadb_x_policy_priority;
2239
2240         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2241         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2242         if (!xp->family) {
2243                 err = -EINVAL;
2244                 goto out;
2245         }
2246         xp->selector.family = xp->family;
2247         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2248         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2249         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2250         if (xp->selector.sport)
2251                 xp->selector.sport_mask = htons(0xffff);
2252
2253         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2254         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2255         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2256
2257         /* Amusing, we set this twice.  KAME apps appear to set same value
2258          * in both addresses.
2259          */
2260         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2261
2262         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2263         if (xp->selector.dport)
2264                 xp->selector.dport_mask = htons(0xffff);
2265
2266         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2267         if (sec_ctx != NULL) {
2268                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2269
2270                 if (!uctx) {
2271                         err = -ENOBUFS;
2272                         goto out;
2273                 }
2274
2275                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2276                 kfree(uctx);
2277
2278                 if (err)
2279                         goto out;
2280         }
2281
2282         xp->lft.soft_byte_limit = XFRM_INF;
2283         xp->lft.hard_byte_limit = XFRM_INF;
2284         xp->lft.soft_packet_limit = XFRM_INF;
2285         xp->lft.hard_packet_limit = XFRM_INF;
2286         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2287                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2288                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2289                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2290                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2291         }
2292         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2293                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2294                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2295                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2296                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2297         }
2298         xp->xfrm_nr = 0;
2299         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2300             (err = parse_ipsecrequests(xp, pol)) < 0)
2301                 goto out;
2302
2303         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2304                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2305
2306         xfrm_audit_policy_add(xp, err ? 0 : 1,
2307                               audit_get_loginuid(current),
2308                               audit_get_sessionid(current), 0);
2309
2310         if (err)
2311                 goto out;
2312
2313         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2314                 c.event = XFRM_MSG_UPDPOLICY;
2315         else
2316                 c.event = XFRM_MSG_NEWPOLICY;
2317
2318         c.seq = hdr->sadb_msg_seq;
2319         c.pid = hdr->sadb_msg_pid;
2320
2321         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2322         xfrm_pol_put(xp);
2323         return 0;
2324
2325 out:
2326         xp->walk.dead = 1;
2327         xfrm_policy_destroy(xp);
2328         return err;
2329 }
2330
2331 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2332 {
2333         struct net *net = sock_net(sk);
2334         int err;
2335         struct sadb_address *sa;
2336         struct sadb_x_policy *pol;
2337         struct xfrm_policy *xp;
2338         struct xfrm_selector sel;
2339         struct km_event c;
2340         struct sadb_x_sec_ctx *sec_ctx;
2341         struct xfrm_sec_ctx *pol_ctx = NULL;
2342
2343         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2344                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2345             !ext_hdrs[SADB_X_EXT_POLICY-1])
2346                 return -EINVAL;
2347
2348         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2349         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2350                 return -EINVAL;
2351
2352         memset(&sel, 0, sizeof(sel));
2353
2354         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2355         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2356         sel.prefixlen_s = sa->sadb_address_prefixlen;
2357         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2358         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2359         if (sel.sport)
2360                 sel.sport_mask = htons(0xffff);
2361
2362         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2363         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2364         sel.prefixlen_d = sa->sadb_address_prefixlen;
2365         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2366         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2367         if (sel.dport)
2368                 sel.dport_mask = htons(0xffff);
2369
2370         sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1];
2371         if (sec_ctx != NULL) {
2372                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2373
2374                 if (!uctx)
2375                         return -ENOMEM;
2376
2377                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2378                 kfree(uctx);
2379                 if (err)
2380                         return err;
2381         }
2382
2383         xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2384                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2385                                    1, &err);
2386         security_xfrm_policy_free(pol_ctx);
2387         if (xp == NULL)
2388                 return -ENOENT;
2389
2390         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2391                                  audit_get_loginuid(current),
2392                                  audit_get_sessionid(current), 0);
2393
2394         if (err)
2395                 goto out;
2396
2397         c.seq = hdr->sadb_msg_seq;
2398         c.pid = hdr->sadb_msg_pid;
2399         c.data.byid = 0;
2400         c.event = XFRM_MSG_DELPOLICY;
2401         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2402
2403 out:
2404         xfrm_pol_put(xp);
2405         return err;
2406 }
2407
2408 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir)
2409 {
2410         int err;
2411         struct sk_buff *out_skb;
2412         struct sadb_msg *out_hdr;
2413         err = 0;
2414
2415         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2416         if (IS_ERR(out_skb)) {
2417                 err =  PTR_ERR(out_skb);
2418                 goto out;
2419         }
2420         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2421         if (err < 0)
2422                 goto out;
2423
2424         out_hdr = (struct sadb_msg *) out_skb->data;
2425         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2426         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2427         out_hdr->sadb_msg_satype = 0;
2428         out_hdr->sadb_msg_errno = 0;
2429         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2430         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2431         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2432         err = 0;
2433
2434 out:
2435         return err;
2436 }
2437
2438 #ifdef CONFIG_NET_KEY_MIGRATE
2439 static int pfkey_sockaddr_pair_size(sa_family_t family)
2440 {
2441         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2442 }
2443
2444 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2445                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2446                                u16 *family)
2447 {
2448         int af, socklen;
2449
2450         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2451                 return -EINVAL;
2452
2453         af = pfkey_sockaddr_extract(sa, saddr);
2454         if (!af)
2455                 return -EINVAL;
2456
2457         socklen = pfkey_sockaddr_len(af);
2458         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2459                                    daddr) != af)
2460                 return -EINVAL;
2461
2462         *family = af;
2463         return 0;
2464 }
2465
2466 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2467                                     struct xfrm_migrate *m)
2468 {
2469         int err;
2470         struct sadb_x_ipsecrequest *rq2;
2471         int mode;
2472
2473         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2474             len < rq1->sadb_x_ipsecrequest_len)
2475                 return -EINVAL;
2476
2477         /* old endoints */
2478         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2479                                   rq1->sadb_x_ipsecrequest_len,
2480                                   &m->old_saddr, &m->old_daddr,
2481                                   &m->old_family);
2482         if (err)
2483                 return err;
2484
2485         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2486         len -= rq1->sadb_x_ipsecrequest_len;
2487
2488         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2489             len < rq2->sadb_x_ipsecrequest_len)
2490                 return -EINVAL;
2491
2492         /* new endpoints */
2493         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2494                                   rq2->sadb_x_ipsecrequest_len,
2495                                   &m->new_saddr, &m->new_daddr,
2496                                   &m->new_family);
2497         if (err)
2498                 return err;
2499
2500         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2501             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2502             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2503                 return -EINVAL;
2504
2505         m->proto = rq1->sadb_x_ipsecrequest_proto;
2506         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2507                 return -EINVAL;
2508         m->mode = mode;
2509         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2510
2511         return ((int)(rq1->sadb_x_ipsecrequest_len +
2512                       rq2->sadb_x_ipsecrequest_len));
2513 }
2514
2515 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2516                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2517 {
2518         int i, len, ret, err = -EINVAL;
2519         u8 dir;
2520         struct sadb_address *sa;
2521         struct sadb_x_kmaddress *kma;
2522         struct sadb_x_policy *pol;
2523         struct sadb_x_ipsecrequest *rq;
2524         struct xfrm_selector sel;
2525         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2526         struct xfrm_kmaddress k;
2527
2528         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2529                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2530             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2531                 err = -EINVAL;
2532                 goto out;
2533         }
2534
2535         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2536         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2537
2538         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2539                 err = -EINVAL;
2540                 goto out;
2541         }
2542
2543         if (kma) {
2544                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2545                 k.reserved = kma->sadb_x_kmaddress_reserved;
2546                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2547                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2548                                           &k.local, &k.remote, &k.family);
2549                 if (ret < 0) {
2550                         err = ret;
2551                         goto out;
2552                 }
2553         }
2554
2555         dir = pol->sadb_x_policy_dir - 1;
2556         memset(&sel, 0, sizeof(sel));
2557
2558         /* set source address info of selector */
2559         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2560         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2561         sel.prefixlen_s = sa->sadb_address_prefixlen;
2562         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2563         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2564         if (sel.sport)
2565                 sel.sport_mask = htons(0xffff);
2566
2567         /* set destination address info of selector */
2568         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2569         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2570         sel.prefixlen_d = sa->sadb_address_prefixlen;
2571         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2572         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2573         if (sel.dport)
2574                 sel.dport_mask = htons(0xffff);
2575
2576         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2577
2578         /* extract ipsecrequests */
2579         i = 0;
2580         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2581
2582         while (len > 0 && i < XFRM_MAX_DEPTH) {
2583                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2584                 if (ret < 0) {
2585                         err = ret;
2586                         goto out;
2587                 } else {
2588                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2589                         len -= ret;
2590                         i++;
2591                 }
2592         }
2593
2594         if (!i || len > 0) {
2595                 err = -EINVAL;
2596                 goto out;
2597         }
2598
2599         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2600                             kma ? &k : NULL);
2601
2602  out:
2603         return err;
2604 }
2605 #else
2606 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2607                          const struct sadb_msg *hdr, void * const *ext_hdrs)
2608 {
2609         return -ENOPROTOOPT;
2610 }
2611 #endif
2612
2613
2614 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2615 {
2616         struct net *net = sock_net(sk);
2617         unsigned int dir;
2618         int err = 0, delete;
2619         struct sadb_x_policy *pol;
2620         struct xfrm_policy *xp;
2621         struct km_event c;
2622
2623         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2624                 return -EINVAL;
2625
2626         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2627         if (dir >= XFRM_POLICY_MAX)
2628                 return -EINVAL;
2629
2630         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2631         xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN,
2632                               dir, pol->sadb_x_policy_id, delete, &err);
2633         if (xp == NULL)
2634                 return -ENOENT;
2635
2636         if (delete) {
2637                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2638                                 audit_get_loginuid(current),
2639                                 audit_get_sessionid(current), 0);
2640
2641                 if (err)
2642                         goto out;
2643                 c.seq = hdr->sadb_msg_seq;
2644                 c.pid = hdr->sadb_msg_pid;
2645                 c.data.byid = 1;
2646                 c.event = XFRM_MSG_DELPOLICY;
2647                 km_policy_notify(xp, dir, &c);
2648         } else {
2649                 err = key_pol_get_resp(sk, xp, hdr, dir);
2650         }
2651
2652 out:
2653         xfrm_pol_put(xp);
2654         return err;
2655 }
2656
2657 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2658 {
2659         struct pfkey_sock *pfk = ptr;
2660         struct sk_buff *out_skb;
2661         struct sadb_msg *out_hdr;
2662         int err;
2663
2664         if (!pfkey_can_dump(&pfk->sk))
2665                 return -ENOBUFS;
2666
2667         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2668         if (IS_ERR(out_skb))
2669                 return PTR_ERR(out_skb);
2670
2671         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2672         if (err < 0)
2673                 return err;
2674
2675         out_hdr = (struct sadb_msg *) out_skb->data;
2676         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2677         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2678         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2679         out_hdr->sadb_msg_errno = 0;
2680         out_hdr->sadb_msg_seq = count + 1;
2681         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2682
2683         if (pfk->dump.skb)
2684                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2685                                 &pfk->sk, sock_net(&pfk->sk));
2686         pfk->dump.skb = out_skb;
2687
2688         return 0;
2689 }
2690
2691 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2692 {
2693         struct net *net = sock_net(&pfk->sk);
2694         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2695 }
2696
2697 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2698 {
2699         xfrm_policy_walk_done(&pfk->dump.u.policy);
2700 }
2701
2702 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2703 {
2704         struct pfkey_sock *pfk = pfkey_sk(sk);
2705
2706         mutex_lock(&pfk->dump_lock);
2707         if (pfk->dump.dump != NULL) {
2708                 mutex_unlock(&pfk->dump_lock);
2709                 return -EBUSY;
2710         }
2711
2712         pfk->dump.msg_version = hdr->sadb_msg_version;
2713         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2714         pfk->dump.dump = pfkey_dump_sp;
2715         pfk->dump.done = pfkey_dump_sp_done;
2716         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2717         mutex_unlock(&pfk->dump_lock);
2718
2719         return pfkey_do_dump(pfk);
2720 }
2721
2722 static int key_notify_policy_flush(const struct km_event *c)
2723 {
2724         struct sk_buff *skb_out;
2725         struct sadb_msg *hdr;
2726
2727         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2728         if (!skb_out)
2729                 return -ENOBUFS;
2730         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2731         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2732         hdr->sadb_msg_seq = c->seq;
2733         hdr->sadb_msg_pid = c->pid;
2734         hdr->sadb_msg_version = PF_KEY_V2;
2735         hdr->sadb_msg_errno = (uint8_t) 0;
2736         hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2737         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2738         hdr->sadb_msg_reserved = 0;
2739         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2740         return 0;
2741
2742 }
2743
2744 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
2745 {
2746         struct net *net = sock_net(sk);
2747         struct km_event c;
2748         struct xfrm_audit audit_info;
2749         int err, err2;
2750
2751         audit_info.loginuid = audit_get_loginuid(current);
2752         audit_info.sessionid = audit_get_sessionid(current);
2753         audit_info.secid = 0;
2754         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2755         err2 = unicast_flush_resp(sk, hdr);
2756         if (err || err2) {
2757                 if (err == -ESRCH) /* empty table - old silent behavior */
2758                         return 0;
2759                 return err;
2760         }
2761
2762         c.data.type = XFRM_POLICY_TYPE_MAIN;
2763         c.event = XFRM_MSG_FLUSHPOLICY;
2764         c.pid = hdr->sadb_msg_pid;
2765         c.seq = hdr->sadb_msg_seq;
2766         c.net = net;
2767         km_policy_notify(NULL, 0, &c);
2768
2769         return 0;
2770 }
2771
2772 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2773                              const struct sadb_msg *hdr, void * const *ext_hdrs);
2774 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2775         [SADB_RESERVED]         = pfkey_reserved,
2776         [SADB_GETSPI]           = pfkey_getspi,
2777         [SADB_UPDATE]           = pfkey_add,
2778         [SADB_ADD]              = pfkey_add,
2779         [SADB_DELETE]           = pfkey_delete,
2780         [SADB_GET]              = pfkey_get,
2781         [SADB_ACQUIRE]          = pfkey_acquire,
2782         [SADB_REGISTER]         = pfkey_register,
2783         [SADB_EXPIRE]           = NULL,
2784         [SADB_FLUSH]            = pfkey_flush,
2785         [SADB_DUMP]             = pfkey_dump,
2786         [SADB_X_PROMISC]        = pfkey_promisc,
2787         [SADB_X_PCHANGE]        = NULL,
2788         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2789         [SADB_X_SPDADD]         = pfkey_spdadd,
2790         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2791         [SADB_X_SPDGET]         = pfkey_spdget,
2792         [SADB_X_SPDACQUIRE]     = NULL,
2793         [SADB_X_SPDDUMP]        = pfkey_spddump,
2794         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2795         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2796         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2797         [SADB_X_MIGRATE]        = pfkey_migrate,
2798 };
2799
2800 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr)
2801 {
2802         void *ext_hdrs[SADB_EXT_MAX];
2803         int err;
2804
2805         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2806                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2807
2808         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2809         err = parse_exthdrs(skb, hdr, ext_hdrs);
2810         if (!err) {
2811                 err = -EOPNOTSUPP;
2812                 if (pfkey_funcs[hdr->sadb_msg_type])
2813                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2814         }
2815         return err;
2816 }
2817
2818 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2819 {
2820         struct sadb_msg *hdr = NULL;
2821
2822         if (skb->len < sizeof(*hdr)) {
2823                 *errp = -EMSGSIZE;
2824         } else {
2825                 hdr = (struct sadb_msg *) skb->data;
2826                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2827                     hdr->sadb_msg_reserved != 0 ||
2828                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2829                      hdr->sadb_msg_type > SADB_MAX)) {
2830                         hdr = NULL;
2831                         *errp = -EINVAL;
2832                 } else if (hdr->sadb_msg_len != (skb->len /
2833                                                  sizeof(uint64_t)) ||
2834                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2835                                                 sizeof(uint64_t))) {
2836                         hdr = NULL;
2837                         *errp = -EMSGSIZE;
2838                 } else {
2839                         *errp = 0;
2840                 }
2841         }
2842         return hdr;
2843 }
2844
2845 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t,
2846                                 const struct xfrm_algo_desc *d)
2847 {
2848         unsigned int id = d->desc.sadb_alg_id;
2849
2850         if (id >= sizeof(t->aalgos) * 8)
2851                 return 0;
2852
2853         return (t->aalgos >> id) & 1;
2854 }
2855
2856 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t,
2857                                 const struct xfrm_algo_desc *d)
2858 {
2859         unsigned int id = d->desc.sadb_alg_id;
2860
2861         if (id >= sizeof(t->ealgos) * 8)
2862                 return 0;
2863
2864         return (t->ealgos >> id) & 1;
2865 }
2866
2867 static int count_ah_combs(const struct xfrm_tmpl *t)
2868 {
2869         int i, sz = 0;
2870
2871         for (i = 0; ; i++) {
2872                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2873                 if (!aalg)
2874                         break;
2875                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2876                         sz += sizeof(struct sadb_comb);
2877         }
2878         return sz + sizeof(struct sadb_prop);
2879 }
2880
2881 static int count_esp_combs(const struct xfrm_tmpl *t)
2882 {
2883         int i, k, sz = 0;
2884
2885         for (i = 0; ; i++) {
2886                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2887                 if (!ealg)
2888                         break;
2889
2890                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2891                         continue;
2892
2893                 for (k = 1; ; k++) {
2894                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2895                         if (!aalg)
2896                                 break;
2897
2898                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2899                                 sz += sizeof(struct sadb_comb);
2900                 }
2901         }
2902         return sz + sizeof(struct sadb_prop);
2903 }
2904
2905 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2906 {
2907         struct sadb_prop *p;
2908         int i;
2909
2910         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2911         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2912         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2913         p->sadb_prop_replay = 32;
2914         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2915
2916         for (i = 0; ; i++) {
2917                 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2918                 if (!aalg)
2919                         break;
2920
2921                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2922                         struct sadb_comb *c;
2923                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2924                         memset(c, 0, sizeof(*c));
2925                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2926                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2927                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2928                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2929                         c->sadb_comb_hard_addtime = 24*60*60;
2930                         c->sadb_comb_soft_addtime = 20*60*60;
2931                         c->sadb_comb_hard_usetime = 8*60*60;
2932                         c->sadb_comb_soft_usetime = 7*60*60;
2933                 }
2934         }
2935 }
2936
2937 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t)
2938 {
2939         struct sadb_prop *p;
2940         int i, k;
2941
2942         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2943         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2944         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2945         p->sadb_prop_replay = 32;
2946         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2947
2948         for (i=0; ; i++) {
2949                 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2950                 if (!ealg)
2951                         break;
2952
2953                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2954                         continue;
2955
2956                 for (k = 1; ; k++) {
2957                         struct sadb_comb *c;
2958                         const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2959                         if (!aalg)
2960                                 break;
2961                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2962                                 continue;
2963                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2964                         memset(c, 0, sizeof(*c));
2965                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2966                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2967                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2968                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2969                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2970                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2971                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2972                         c->sadb_comb_hard_addtime = 24*60*60;
2973                         c->sadb_comb_soft_addtime = 20*60*60;
2974                         c->sadb_comb_hard_usetime = 8*60*60;
2975                         c->sadb_comb_soft_usetime = 7*60*60;
2976                 }
2977         }
2978 }
2979
2980 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c)
2981 {
2982         return 0;
2983 }
2984
2985 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c)
2986 {
2987         struct sk_buff *out_skb;
2988         struct sadb_msg *out_hdr;
2989         int hard;
2990         int hsc;
2991
2992         hard = c->data.hard;
2993         if (hard)
2994                 hsc = 2;
2995         else
2996                 hsc = 1;
2997
2998         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2999         if (IS_ERR(out_skb))
3000                 return PTR_ERR(out_skb);
3001
3002         out_hdr = (struct sadb_msg *) out_skb->data;
3003         out_hdr->sadb_msg_version = PF_KEY_V2;
3004         out_hdr->sadb_msg_type = SADB_EXPIRE;
3005         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3006         out_hdr->sadb_msg_errno = 0;
3007         out_hdr->sadb_msg_reserved = 0;
3008         out_hdr->sadb_msg_seq = 0;
3009         out_hdr->sadb_msg_pid = 0;
3010
3011         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3012                         xs_net(x));
3013         return 0;
3014 }
3015
3016 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c)
3017 {
3018         struct net *net = x ? xs_net(x) : c->net;
3019         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3020
3021         if (atomic_read(&net_pfkey->socks_nr) == 0)
3022                 return 0;
3023
3024         switch (c->event) {
3025         case XFRM_MSG_EXPIRE:
3026                 return key_notify_sa_expire(x, c);
3027         case XFRM_MSG_DELSA:
3028         case XFRM_MSG_NEWSA:
3029         case XFRM_MSG_UPDSA:
3030                 return key_notify_sa(x, c);
3031         case XFRM_MSG_FLUSHSA:
3032                 return key_notify_sa_flush(c);
3033         case XFRM_MSG_NEWAE: /* not yet supported */
3034                 break;
3035         default:
3036                 pr_err("pfkey: Unknown SA event %d\n", c->event);
3037                 break;
3038         }
3039
3040         return 0;
3041 }
3042
3043 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3044 {
3045         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3046                 return 0;
3047
3048         switch (c->event) {
3049         case XFRM_MSG_POLEXPIRE:
3050                 return key_notify_policy_expire(xp, c);
3051         case XFRM_MSG_DELPOLICY:
3052         case XFRM_MSG_NEWPOLICY:
3053         case XFRM_MSG_UPDPOLICY:
3054                 return key_notify_policy(xp, dir, c);
3055         case XFRM_MSG_FLUSHPOLICY:
3056                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3057                         break;
3058                 return key_notify_policy_flush(c);
3059         default:
3060                 pr_err("pfkey: Unknown policy event %d\n", c->event);
3061                 break;
3062         }
3063
3064         return 0;
3065 }
3066
3067 static u32 get_acqseq(void)
3068 {
3069         u32 res;
3070         static atomic_t acqseq;
3071
3072         do {
3073                 res = atomic_inc_return(&acqseq);
3074         } while (!res);
3075         return res;
3076 }
3077
3078 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3079 {
3080         struct sk_buff *skb;
3081         struct sadb_msg *hdr;
3082         struct sadb_address *addr;
3083         struct sadb_x_policy *pol;
3084         int sockaddr_size;
3085         int size;
3086         struct sadb_x_sec_ctx *sec_ctx;
3087         struct xfrm_sec_ctx *xfrm_ctx;
3088         int ctx_size = 0;
3089
3090         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3091         if (!sockaddr_size)
3092                 return -EINVAL;
3093
3094         size = sizeof(struct sadb_msg) +
3095                 (sizeof(struct sadb_address) * 2) +
3096                 (sockaddr_size * 2) +
3097                 sizeof(struct sadb_x_policy);
3098
3099         if (x->id.proto == IPPROTO_AH)
3100                 size += count_ah_combs(t);
3101         else if (x->id.proto == IPPROTO_ESP)
3102                 size += count_esp_combs(t);
3103
3104         if ((xfrm_ctx = x->security)) {
3105                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3106                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3107         }
3108
3109         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3110         if (skb == NULL)
3111                 return -ENOMEM;
3112
3113         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3114         hdr->sadb_msg_version = PF_KEY_V2;
3115         hdr->sadb_msg_type = SADB_ACQUIRE;
3116         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3117         hdr->sadb_msg_len = size / sizeof(uint64_t);
3118         hdr->sadb_msg_errno = 0;
3119         hdr->sadb_msg_reserved = 0;
3120         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3121         hdr->sadb_msg_pid = 0;
3122
3123         /* src address */
3124         addr = (struct sadb_address*) skb_put(skb,
3125                                               sizeof(struct sadb_address)+sockaddr_size);
3126         addr->sadb_address_len =
3127                 (sizeof(struct sadb_address)+sockaddr_size)/
3128                         sizeof(uint64_t);
3129         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3130         addr->sadb_address_proto = 0;
3131         addr->sadb_address_reserved = 0;
3132         addr->sadb_address_prefixlen =
3133                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3134                                     (struct sockaddr *) (addr + 1),
3135                                     x->props.family);
3136         if (!addr->sadb_address_prefixlen)
3137                 BUG();
3138
3139         /* dst address */
3140         addr = (struct sadb_address*) skb_put(skb,
3141                                               sizeof(struct sadb_address)+sockaddr_size);
3142         addr->sadb_address_len =
3143                 (sizeof(struct sadb_address)+sockaddr_size)/
3144                         sizeof(uint64_t);
3145         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3146         addr->sadb_address_proto = 0;
3147         addr->sadb_address_reserved = 0;
3148         addr->sadb_address_prefixlen =
3149                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3150                                     (struct sockaddr *) (addr + 1),
3151                                     x->props.family);
3152         if (!addr->sadb_address_prefixlen)
3153                 BUG();
3154
3155         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3156         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3157         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3158         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3159         pol->sadb_x_policy_dir = dir+1;
3160         pol->sadb_x_policy_reserved = 0;
3161         pol->sadb_x_policy_id = xp->index;
3162         pol->sadb_x_policy_priority = xp->priority;
3163
3164         /* Set sadb_comb's. */
3165         if (x->id.proto == IPPROTO_AH)
3166                 dump_ah_combs(skb, t);
3167         else if (x->id.proto == IPPROTO_ESP)
3168                 dump_esp_combs(skb, t);
3169
3170         /* security context */
3171         if (xfrm_ctx) {
3172                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3173                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3174                 sec_ctx->sadb_x_sec_len =
3175                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3176                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3177                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3178                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3179                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3180                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3181                        xfrm_ctx->ctx_len);
3182         }
3183
3184         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3185                                xs_net(x));
3186 }
3187
3188 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3189                                                 u8 *data, int len, int *dir)
3190 {
3191         struct net *net = sock_net(sk);
3192         struct xfrm_policy *xp;
3193         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3194         struct sadb_x_sec_ctx *sec_ctx;
3195
3196         switch (sk->sk_family) {
3197         case AF_INET:
3198                 if (opt != IP_IPSEC_POLICY) {
3199                         *dir = -EOPNOTSUPP;
3200                         return NULL;
3201                 }
3202                 break;
3203 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3204         case AF_INET6:
3205                 if (opt != IPV6_IPSEC_POLICY) {
3206                         *dir = -EOPNOTSUPP;
3207                         return NULL;
3208                 }
3209                 break;
3210 #endif
3211         default:
3212                 *dir = -EINVAL;
3213                 return NULL;
3214         }
3215
3216         *dir = -EINVAL;
3217
3218         if (len < sizeof(struct sadb_x_policy) ||
3219             pol->sadb_x_policy_len*8 > len ||
3220             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3221             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3222                 return NULL;
3223
3224         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3225         if (xp == NULL) {
3226                 *dir = -ENOBUFS;
3227                 return NULL;
3228         }
3229
3230         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3231                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3232
3233         xp->lft.soft_byte_limit = XFRM_INF;
3234         xp->lft.hard_byte_limit = XFRM_INF;
3235         xp->lft.soft_packet_limit = XFRM_INF;
3236         xp->lft.hard_packet_limit = XFRM_INF;
3237         xp->family = sk->sk_family;
3238
3239         xp->xfrm_nr = 0;
3240         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3241             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3242                 goto out;
3243
3244         /* security context too */
3245         if (len >= (pol->sadb_x_policy_len*8 +
3246             sizeof(struct sadb_x_sec_ctx))) {
3247                 char *p = (char *)pol;
3248                 struct xfrm_user_sec_ctx *uctx;
3249
3250                 p += pol->sadb_x_policy_len*8;
3251                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3252                 if (len < pol->sadb_x_policy_len*8 +
3253                     sec_ctx->sadb_x_sec_len*8) {
3254                         *dir = -EINVAL;
3255                         goto out;
3256                 }
3257                 if ((*dir = verify_sec_ctx_len(p)))
3258                         goto out;
3259                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3260                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3261                 kfree(uctx);
3262
3263                 if (*dir)
3264                         goto out;
3265         }
3266
3267         *dir = pol->sadb_x_policy_dir-1;
3268         return xp;
3269
3270 out:
3271         xp->walk.dead = 1;
3272         xfrm_policy_destroy(xp);
3273         return NULL;
3274 }
3275
3276 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3277 {
3278         struct sk_buff *skb;
3279         struct sadb_msg *hdr;
3280         struct sadb_sa *sa;
3281         struct sadb_address *addr;
3282         struct sadb_x_nat_t_port *n_port;
3283         int sockaddr_size;
3284         int size;
3285         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3286         struct xfrm_encap_tmpl *natt = NULL;
3287
3288         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3289         if (!sockaddr_size)
3290                 return -EINVAL;
3291
3292         if (!satype)
3293                 return -EINVAL;
3294
3295         if (!x->encap)
3296                 return -EINVAL;
3297
3298         natt = x->encap;
3299
3300         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3301          *
3302          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3303          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3304          */
3305
3306         size = sizeof(struct sadb_msg) +
3307                 sizeof(struct sadb_sa) +
3308                 (sizeof(struct sadb_address) * 2) +
3309                 (sockaddr_size * 2) +
3310                 (sizeof(struct sadb_x_nat_t_port) * 2);
3311
3312         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3313         if (skb == NULL)
3314                 return -ENOMEM;
3315
3316         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3317         hdr->sadb_msg_version = PF_KEY_V2;
3318         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3319         hdr->sadb_msg_satype = satype;
3320         hdr->sadb_msg_len = size / sizeof(uint64_t);
3321         hdr->sadb_msg_errno = 0;
3322         hdr->sadb_msg_reserved = 0;
3323         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3324         hdr->sadb_msg_pid = 0;
3325
3326         /* SA */
3327         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3328         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3329         sa->sadb_sa_exttype = SADB_EXT_SA;
3330         sa->sadb_sa_spi = x->id.spi;
3331         sa->sadb_sa_replay = 0;
3332         sa->sadb_sa_state = 0;
3333         sa->sadb_sa_auth = 0;
3334         sa->sadb_sa_encrypt = 0;
3335         sa->sadb_sa_flags = 0;
3336
3337         /* ADDRESS_SRC (old 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_SRC;
3344         addr->sadb_address_proto = 0;
3345         addr->sadb_address_reserved = 0;
3346         addr->sadb_address_prefixlen =
3347                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3348                                     (struct sockaddr *) (addr + 1),
3349                                     x->props.family);
3350         if (!addr->sadb_address_prefixlen)
3351                 BUG();
3352
3353         /* NAT_T_SPORT (old 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_SPORT;
3357         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3358         n_port->sadb_x_nat_t_port_reserved = 0;
3359
3360         /* ADDRESS_DST (new addr) */
3361         addr = (struct sadb_address*)
3362                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3363         addr->sadb_address_len =
3364                 (sizeof(struct sadb_address)+sockaddr_size)/
3365                         sizeof(uint64_t);
3366         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3367         addr->sadb_address_proto = 0;
3368         addr->sadb_address_reserved = 0;
3369         addr->sadb_address_prefixlen =
3370                 pfkey_sockaddr_fill(ipaddr, 0,
3371                                     (struct sockaddr *) (addr + 1),
3372                                     x->props.family);
3373         if (!addr->sadb_address_prefixlen)
3374                 BUG();
3375
3376         /* NAT_T_DPORT (new port) */
3377         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3378         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3379         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3380         n_port->sadb_x_nat_t_port_port = sport;
3381         n_port->sadb_x_nat_t_port_reserved = 0;
3382
3383         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL,
3384                                xs_net(x));
3385 }
3386
3387 #ifdef CONFIG_NET_KEY_MIGRATE
3388 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3389                             const struct xfrm_selector *sel)
3390 {
3391         struct sadb_address *addr;
3392         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3393         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3394         addr->sadb_address_exttype = type;
3395         addr->sadb_address_proto = sel->proto;
3396         addr->sadb_address_reserved = 0;
3397
3398         switch (type) {
3399         case SADB_EXT_ADDRESS_SRC:
3400                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3401                 pfkey_sockaddr_fill(&sel->saddr, 0,
3402                                     (struct sockaddr *)(addr + 1),
3403                                     sel->family);
3404                 break;
3405         case SADB_EXT_ADDRESS_DST:
3406                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3407                 pfkey_sockaddr_fill(&sel->daddr, 0,
3408                                     (struct sockaddr *)(addr + 1),
3409                                     sel->family);
3410                 break;
3411         default:
3412                 return -EINVAL;
3413         }
3414
3415         return 0;
3416 }
3417
3418
3419 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k)
3420 {
3421         struct sadb_x_kmaddress *kma;
3422         u8 *sa;
3423         int family = k->family;
3424         int socklen = pfkey_sockaddr_len(family);
3425         int size_req;
3426
3427         size_req = (sizeof(struct sadb_x_kmaddress) +
3428                     pfkey_sockaddr_pair_size(family));
3429
3430         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3431         memset(kma, 0, size_req);
3432         kma->sadb_x_kmaddress_len = size_req / 8;
3433         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3434         kma->sadb_x_kmaddress_reserved = k->reserved;
3435
3436         sa = (u8 *)(kma + 1);
3437         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3438             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3439                 return -EINVAL;
3440
3441         return 0;
3442 }
3443
3444 static int set_ipsecrequest(struct sk_buff *skb,
3445                             uint8_t proto, uint8_t mode, int level,
3446                             uint32_t reqid, uint8_t family,
3447                             const xfrm_address_t *src, const xfrm_address_t *dst)
3448 {
3449         struct sadb_x_ipsecrequest *rq;
3450         u8 *sa;
3451         int socklen = pfkey_sockaddr_len(family);
3452         int size_req;
3453
3454         size_req = sizeof(struct sadb_x_ipsecrequest) +
3455                    pfkey_sockaddr_pair_size(family);
3456
3457         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3458         memset(rq, 0, size_req);
3459         rq->sadb_x_ipsecrequest_len = size_req;
3460         rq->sadb_x_ipsecrequest_proto = proto;
3461         rq->sadb_x_ipsecrequest_mode = mode;
3462         rq->sadb_x_ipsecrequest_level = level;
3463         rq->sadb_x_ipsecrequest_reqid = reqid;
3464
3465         sa = (u8 *) (rq + 1);
3466         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3467             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3468                 return -EINVAL;
3469
3470         return 0;
3471 }
3472 #endif
3473
3474 #ifdef CONFIG_NET_KEY_MIGRATE
3475 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3476                               const struct xfrm_migrate *m, int num_bundles,
3477                               const struct xfrm_kmaddress *k)
3478 {
3479         int i;
3480         int sasize_sel;
3481         int size = 0;
3482         int size_pol = 0;
3483         struct sk_buff *skb;
3484         struct sadb_msg *hdr;
3485         struct sadb_x_policy *pol;
3486         const struct xfrm_migrate *mp;
3487
3488         if (type != XFRM_POLICY_TYPE_MAIN)
3489                 return 0;
3490
3491         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3492                 return -EINVAL;
3493
3494         if (k != NULL) {
3495                 /* addresses for KM */
3496                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3497                                      pfkey_sockaddr_pair_size(k->family));
3498         }
3499
3500         /* selector */
3501         sasize_sel = pfkey_sockaddr_size(sel->family);
3502         if (!sasize_sel)
3503                 return -EINVAL;
3504         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3505
3506         /* policy info */
3507         size_pol += sizeof(struct sadb_x_policy);
3508
3509         /* ipsecrequests */
3510         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3511                 /* old locator pair */
3512                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3513                             pfkey_sockaddr_pair_size(mp->old_family);
3514                 /* new locator pair */
3515                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3516                             pfkey_sockaddr_pair_size(mp->new_family);
3517         }
3518
3519         size += sizeof(struct sadb_msg) + size_pol;
3520
3521         /* alloc buffer */
3522         skb = alloc_skb(size, GFP_ATOMIC);
3523         if (skb == NULL)
3524                 return -ENOMEM;
3525
3526         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3527         hdr->sadb_msg_version = PF_KEY_V2;
3528         hdr->sadb_msg_type = SADB_X_MIGRATE;
3529         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3530         hdr->sadb_msg_len = size / 8;
3531         hdr->sadb_msg_errno = 0;
3532         hdr->sadb_msg_reserved = 0;
3533         hdr->sadb_msg_seq = 0;
3534         hdr->sadb_msg_pid = 0;
3535
3536         /* Addresses to be used by KM for negotiation, if ext is available */
3537         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3538                 return -EINVAL;
3539
3540         /* selector src */
3541         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3542
3543         /* selector dst */
3544         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3545
3546         /* policy information */
3547         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3548         pol->sadb_x_policy_len = size_pol / 8;
3549         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3550         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3551         pol->sadb_x_policy_dir = dir + 1;
3552         pol->sadb_x_policy_reserved = 0;
3553         pol->sadb_x_policy_id = 0;
3554         pol->sadb_x_policy_priority = 0;
3555
3556         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3557                 /* old ipsecrequest */
3558                 int mode = pfkey_mode_from_xfrm(mp->mode);
3559                 if (mode < 0)
3560                         goto err;
3561                 if (set_ipsecrequest(skb, mp->proto, mode,
3562                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3563                                      mp->reqid, mp->old_family,
3564                                      &mp->old_saddr, &mp->old_daddr) < 0)
3565                         goto err;
3566
3567                 /* new ipsecrequest */
3568                 if (set_ipsecrequest(skb, mp->proto, mode,
3569                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3570                                      mp->reqid, mp->new_family,
3571                                      &mp->new_saddr, &mp->new_daddr) < 0)
3572                         goto err;
3573         }
3574
3575         /* broadcast migrate message to sockets */
3576         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3577
3578         return 0;
3579
3580 err:
3581         kfree_skb(skb);
3582         return -EINVAL;
3583 }
3584 #else
3585 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
3586                               const struct xfrm_migrate *m, int num_bundles,
3587                               const struct xfrm_kmaddress *k)
3588 {
3589         return -ENOPROTOOPT;
3590 }
3591 #endif
3592
3593 static int pfkey_sendmsg(struct kiocb *kiocb,
3594                          struct socket *sock, struct msghdr *msg, size_t len)
3595 {
3596         struct sock *sk = sock->sk;
3597         struct sk_buff *skb = NULL;
3598         struct sadb_msg *hdr = NULL;
3599         int err;
3600
3601         err = -EOPNOTSUPP;
3602         if (msg->msg_flags & MSG_OOB)
3603                 goto out;
3604
3605         err = -EMSGSIZE;
3606         if ((unsigned)len > sk->sk_sndbuf - 32)
3607                 goto out;
3608
3609         err = -ENOBUFS;
3610         skb = alloc_skb(len, GFP_KERNEL);
3611         if (skb == NULL)
3612                 goto out;
3613
3614         err = -EFAULT;
3615         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3616                 goto out;
3617
3618         hdr = pfkey_get_base_msg(skb, &err);
3619         if (!hdr)
3620                 goto out;
3621
3622         mutex_lock(&xfrm_cfg_mutex);
3623         err = pfkey_process(sk, skb, hdr);
3624         mutex_unlock(&xfrm_cfg_mutex);
3625
3626 out:
3627         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3628                 err = 0;
3629         kfree_skb(skb);
3630
3631         return err ? : len;
3632 }
3633
3634 static int pfkey_recvmsg(struct kiocb *kiocb,
3635                          struct socket *sock, struct msghdr *msg, size_t len,
3636                          int flags)
3637 {
3638         struct sock *sk = sock->sk;
3639         struct pfkey_sock *pfk = pfkey_sk(sk);
3640         struct sk_buff *skb;
3641         int copied, err;
3642
3643         err = -EINVAL;
3644         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3645                 goto out;
3646
3647         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3648         if (skb == NULL)
3649                 goto out;
3650
3651         copied = skb->len;
3652         if (copied > len) {
3653                 msg->msg_flags |= MSG_TRUNC;
3654                 copied = len;
3655         }
3656
3657         skb_reset_transport_header(skb);
3658         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3659         if (err)
3660                 goto out_free;
3661
3662         sock_recv_ts_and_drops(msg, sk, skb);
3663
3664         err = (flags & MSG_TRUNC) ? skb->len : copied;
3665
3666         if (pfk->dump.dump != NULL &&
3667             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3668                 pfkey_do_dump(pfk);
3669
3670 out_free:
3671         skb_free_datagram(sk, skb);
3672 out:
3673         return err;
3674 }
3675
3676 static const struct proto_ops pfkey_ops = {
3677         .family         =       PF_KEY,
3678         .owner          =       THIS_MODULE,
3679         /* Operations that make no sense on pfkey sockets. */
3680         .bind           =       sock_no_bind,
3681         .connect        =       sock_no_connect,
3682         .socketpair     =       sock_no_socketpair,
3683         .accept         =       sock_no_accept,
3684         .getname        =       sock_no_getname,
3685         .ioctl          =       sock_no_ioctl,
3686         .listen         =       sock_no_listen,
3687         .shutdown       =       sock_no_shutdown,
3688         .setsockopt     =       sock_no_setsockopt,
3689         .getsockopt     =       sock_no_getsockopt,
3690         .mmap           =       sock_no_mmap,
3691         .sendpage       =       sock_no_sendpage,
3692
3693         /* Now the operations that really occur. */
3694         .release        =       pfkey_release,
3695         .poll           =       datagram_poll,
3696         .sendmsg        =       pfkey_sendmsg,
3697         .recvmsg        =       pfkey_recvmsg,
3698 };
3699
3700 static const struct net_proto_family pfkey_family_ops = {
3701         .family =       PF_KEY,
3702         .create =       pfkey_create,
3703         .owner  =       THIS_MODULE,
3704 };
3705
3706 #ifdef CONFIG_PROC_FS
3707 static int pfkey_seq_show(struct seq_file *f, void *v)
3708 {
3709         struct sock *s = sk_entry(v);
3710
3711         if (v == SEQ_START_TOKEN)
3712                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3713         else
3714                 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n",
3715                                s,
3716                                atomic_read(&s->sk_refcnt),
3717                                sk_rmem_alloc_get(s),
3718                                sk_wmem_alloc_get(s),
3719                                sock_i_uid(s),
3720                                sock_i_ino(s)
3721                                );
3722         return 0;
3723 }
3724
3725 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3726         __acquires(rcu)
3727 {
3728         struct net *net = seq_file_net(f);
3729         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3730
3731         rcu_read_lock();
3732         return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos);
3733 }
3734
3735 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3736 {
3737         struct net *net = seq_file_net(f);
3738         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3739
3740         return seq_hlist_next_rcu(v, &net_pfkey->table, ppos);
3741 }
3742
3743 static void pfkey_seq_stop(struct seq_file *f, void *v)
3744         __releases(rcu)
3745 {
3746         rcu_read_unlock();
3747 }
3748
3749 static const struct seq_operations pfkey_seq_ops = {
3750         .start  = pfkey_seq_start,
3751         .next   = pfkey_seq_next,
3752         .stop   = pfkey_seq_stop,
3753         .show   = pfkey_seq_show,
3754 };
3755
3756 static int pfkey_seq_open(struct inode *inode, struct file *file)
3757 {
3758         return seq_open_net(inode, file, &pfkey_seq_ops,
3759                             sizeof(struct seq_net_private));
3760 }
3761
3762 static const struct file_operations pfkey_proc_ops = {
3763         .open    = pfkey_seq_open,
3764         .read    = seq_read,
3765         .llseek  = seq_lseek,
3766         .release = seq_release_net,
3767 };
3768
3769 static int __net_init pfkey_init_proc(struct net *net)
3770 {
3771         struct proc_dir_entry *e;
3772
3773         e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3774         if (e == NULL)
3775                 return -ENOMEM;
3776
3777         return 0;
3778 }
3779
3780 static void __net_exit pfkey_exit_proc(struct net *net)
3781 {
3782         proc_net_remove(net, "pfkey");
3783 }
3784 #else
3785 static inline int pfkey_init_proc(struct net *net)
3786 {
3787         return 0;
3788 }
3789
3790 static inline void pfkey_exit_proc(struct net *net)
3791 {
3792 }
3793 #endif
3794
3795 static struct xfrm_mgr pfkeyv2_mgr =
3796 {
3797         .id             = "pfkeyv2",
3798         .notify         = pfkey_send_notify,
3799         .acquire        = pfkey_send_acquire,
3800         .compile_policy = pfkey_compile_policy,
3801         .new_mapping    = pfkey_send_new_mapping,
3802         .notify_policy  = pfkey_send_policy_notify,
3803         .migrate        = pfkey_send_migrate,
3804 };
3805
3806 static int __net_init pfkey_net_init(struct net *net)
3807 {
3808         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3809         int rv;
3810
3811         INIT_HLIST_HEAD(&net_pfkey->table);
3812         atomic_set(&net_pfkey->socks_nr, 0);
3813
3814         rv = pfkey_init_proc(net);
3815
3816         return rv;
3817 }
3818
3819 static void __net_exit pfkey_net_exit(struct net *net)
3820 {
3821         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3822
3823         pfkey_exit_proc(net);
3824         BUG_ON(!hlist_empty(&net_pfkey->table));
3825 }
3826
3827 static struct pernet_operations pfkey_net_ops = {
3828         .init = pfkey_net_init,
3829         .exit = pfkey_net_exit,
3830         .id   = &pfkey_net_id,
3831         .size = sizeof(struct netns_pfkey),
3832 };
3833
3834 static void __exit ipsec_pfkey_exit(void)
3835 {
3836         xfrm_unregister_km(&pfkeyv2_mgr);
3837         sock_unregister(PF_KEY);
3838         unregister_pernet_subsys(&pfkey_net_ops);
3839         proto_unregister(&key_proto);
3840 }
3841
3842 static int __init ipsec_pfkey_init(void)
3843 {
3844         int err = proto_register(&key_proto, 0);
3845
3846         if (err != 0)
3847                 goto out;
3848
3849         err = register_pernet_subsys(&pfkey_net_ops);
3850         if (err != 0)
3851                 goto out_unregister_key_proto;
3852         err = sock_register(&pfkey_family_ops);
3853         if (err != 0)
3854                 goto out_unregister_pernet;
3855         err = xfrm_register_km(&pfkeyv2_mgr);
3856         if (err != 0)
3857                 goto out_sock_unregister;
3858 out:
3859         return err;
3860
3861 out_sock_unregister:
3862         sock_unregister(PF_KEY);
3863 out_unregister_pernet:
3864         unregister_pernet_subsys(&pfkey_net_ops);
3865 out_unregister_key_proto:
3866         proto_unregister(&key_proto);
3867         goto out;
3868 }
3869
3870 module_init(ipsec_pfkey_init);
3871 module_exit(ipsec_pfkey_exit);
3872 MODULE_LICENSE("GPL");
3873 MODULE_ALIAS_NETPROTO(PF_KEY);