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 <net/net_namespace.h>
  30 #include <net/xfrm.h>
  31
  32 #include <net/sock.h>
  33
  34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  36
  37
  38 /* List of all pfkey sockets. */
  39 static HLIST_HEAD(pfkey_table);
  40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  41 static DEFINE_RWLOCK(pfkey_table_lock);
  42 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
  43
  44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
  45
  46 struct pfkey_sock {
  47         /* struct sock must be the first member of struct pfkey_sock */
  48         struct sock     sk;
  49         int             registered;
  50         int             promisc;
  51
  52         struct {
  53                 uint8_t         msg_version;
  54                 uint32_t        msg_pid;
  55                 int             (*dump)(struct pfkey_sock *sk);
  56                 void            (*done)(struct pfkey_sock *sk);
  57                 union {
  58                         struct xfrm_policy_walk policy;
  59                         struct xfrm_state_walk  state;
  60                 } u;
  61         } dump;
  62 };
  63
  64 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  65 {
  66         return (struct pfkey_sock *)sk;
  67 }
  68
  69 static int pfkey_can_dump(struct sock *sk)
  70 {
  71         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  72                 return 1;
  73         return 0;
  74 }
  75
  76 static int pfkey_do_dump(struct pfkey_sock *pfk)
  77 {
  78         int rc;
  79
  80         rc = pfk->dump.dump(pfk);
  81         if (rc == -ENOBUFS)
  82                 return 0;
  83
  84         pfk->dump.done(pfk);
  85         pfk->dump.dump = NULL;
  86         pfk->dump.done = NULL;
  87         return rc;
  88 }
  89
  90 static void pfkey_sock_destruct(struct sock *sk)
  91 {
  92         skb_queue_purge(&sk->sk_receive_queue);
  93
  94         if (!sock_flag(sk, SOCK_DEAD)) {
  95                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  96                 return;
  97         }
  98
  99         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
 100         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
 101
 102         atomic_dec(&pfkey_socks_nr);
 103 }
 104
 105 static void pfkey_table_grab(void)
 106 {
 107         write_lock_bh(&pfkey_table_lock);
 108
 109         if (atomic_read(&pfkey_table_users)) {
 110                 DECLARE_WAITQUEUE(wait, current);
 111
 112                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
 113                 for(;;) {
 114                         set_current_state(TASK_UNINTERRUPTIBLE);
 115                         if (atomic_read(&pfkey_table_users) == 0)
 116                                 break;
 117                         write_unlock_bh(&pfkey_table_lock);
 118                         schedule();
 119                         write_lock_bh(&pfkey_table_lock);
 120                 }
 121
 122                 __set_current_state(TASK_RUNNING);
 123                 remove_wait_queue(&pfkey_table_wait, &wait);
 124         }
 125 }
 126
 127 static __inline__ void pfkey_table_ungrab(void)
 128 {
 129         write_unlock_bh(&pfkey_table_lock);
 130         wake_up(&pfkey_table_wait);
 131 }
 132
 133 static __inline__ void pfkey_lock_table(void)
 134 {
 135         /* read_lock() synchronizes us to pfkey_table_grab */
 136
 137         read_lock(&pfkey_table_lock);
 138         atomic_inc(&pfkey_table_users);
 139         read_unlock(&pfkey_table_lock);
 140 }
 141
 142 static __inline__ void pfkey_unlock_table(void)
 143 {
 144         if (atomic_dec_and_test(&pfkey_table_users))
 145                 wake_up(&pfkey_table_wait);
 146 }
 147
 148
 149 static const struct proto_ops pfkey_ops;
 150
 151 static void pfkey_insert(struct sock *sk)
 152 {
 153         pfkey_table_grab();
 154         sk_add_node(sk, &pfkey_table);
 155         pfkey_table_ungrab();
 156 }
 157
 158 static void pfkey_remove(struct sock *sk)
 159 {
 160         pfkey_table_grab();
 161         sk_del_node_init(sk);
 162         pfkey_table_ungrab();
 163 }
 164
 165 static struct proto key_proto = {
 166         .name     = "KEY",
 167         .owner    = THIS_MODULE,
 168         .obj_size = sizeof(struct pfkey_sock),
 169 };
 170
 171 static int pfkey_create(struct net *net, struct socket *sock, int protocol)
 172 {
 173         struct sock *sk;
 174         int err;
 175
 176         if (net != &init_net)
 177                 return -EAFNOSUPPORT;
 178
 179         if (!capable(CAP_NET_ADMIN))
 180                 return -EPERM;
 181         if (sock->type != SOCK_RAW)
 182                 return -ESOCKTNOSUPPORT;
 183         if (protocol != PF_KEY_V2)
 184                 return -EPROTONOSUPPORT;
 185
 186         err = -ENOMEM;
 187         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 188         if (sk == NULL)
 189                 goto out;
 190
 191         sock->ops = &pfkey_ops;
 192         sock_init_data(sock, sk);
 193
 194         sk->sk_family = PF_KEY;
 195         sk->sk_destruct = pfkey_sock_destruct;
 196
 197         atomic_inc(&pfkey_socks_nr);
 198
 199         pfkey_insert(sk);
 200
 201         return 0;
 202 out:
 203         return err;
 204 }
 205
 206 static int pfkey_release(struct socket *sock)
 207 {
 208         struct sock *sk = sock->sk;
 209
 210         if (!sk)
 211                 return 0;
 212
 213         pfkey_remove(sk);
 214
 215         sock_orphan(sk);
 216         sock->sk = NULL;
 217         skb_queue_purge(&sk->sk_write_queue);
 218         sock_put(sk);
 219
 220         return 0;
 221 }
 222
 223 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 224                                gfp_t allocation, struct sock *sk)
 225 {
 226         int err = -ENOBUFS;
 227
 228         sock_hold(sk);
 229         if (*skb2 == NULL) {
 230                 if (atomic_read(&skb->users) != 1) {
 231                         *skb2 = skb_clone(skb, allocation);
 232                 } else {
 233                         *skb2 = skb;
 234                         atomic_inc(&skb->users);
 235                 }
 236         }
 237         if (*skb2 != NULL) {
 238                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 239                         skb_orphan(*skb2);
 240                         skb_set_owner_r(*skb2, sk);
 241                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 242                         sk->sk_data_ready(sk, (*skb2)->len);
 243                         *skb2 = NULL;
 244                         err = 0;
 245                 }
 246         }
 247         sock_put(sk);
 248         return err;
 249 }
 250
 251 /* Send SKB to all pfkey sockets matching selected criteria.  */
 252 #define BROADCAST_ALL           0
 253 #define BROADCAST_ONE           1
 254 #define BROADCAST_REGISTERED    2
 255 #define BROADCAST_PROMISC_ONLY  4
 256 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 257                            int broadcast_flags, struct sock *one_sk)
 258 {
 259         struct sock *sk;
 260         struct hlist_node *node;
 261         struct sk_buff *skb2 = NULL;
 262         int err = -ESRCH;
 263
 264         /* XXX Do we need something like netlink_overrun?  I think
 265          * XXX PF_KEY socket apps will not mind current behavior.
 266          */
 267         if (!skb)
 268                 return -ENOMEM;
 269
 270         pfkey_lock_table();
 271         sk_for_each(sk, node, &pfkey_table) {
 272                 struct pfkey_sock *pfk = pfkey_sk(sk);
 273                 int err2;
 274
 275                 /* Yes, it means that if you are meant to receive this
 276                  * pfkey message you receive it twice as promiscuous
 277                  * socket.
 278                  */
 279                 if (pfk->promisc)
 280                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 281
 282                 /* the exact target will be processed later */
 283                 if (sk == one_sk)
 284                         continue;
 285                 if (broadcast_flags != BROADCAST_ALL) {
 286                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 287                                 continue;
 288                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 289                             !pfk->registered)
 290                                 continue;
 291                         if (broadcast_flags & BROADCAST_ONE)
 292                                 continue;
 293                 }
 294
 295                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 296
 297                 /* Error is cleare after succecful sending to at least one
 298                  * registered KM */
 299                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 300                         err = err2;
 301         }
 302         pfkey_unlock_table();
 303
 304         if (one_sk != NULL)
 305                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 306
 307         if (skb2)
 308                 kfree_skb(skb2);
 309         kfree_skb(skb);
 310         return err;
 311 }
 312
 313 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 314 {
 315         *new = *orig;
 316 }
 317
 318 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 319 {
 320         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 321         struct sadb_msg *hdr;
 322
 323         if (!skb)
 324                 return -ENOBUFS;
 325
 326         /* Woe be to the platform trying to support PFKEY yet
 327          * having normal errnos outside the 1-255 range, inclusive.
 328          */
 329         err = -err;
 330         if (err == ERESTARTSYS ||
 331             err == ERESTARTNOHAND ||
 332             err == ERESTARTNOINTR)
 333                 err = EINTR;
 334         if (err >= 512)
 335                 err = EINVAL;
 336         BUG_ON(err <= 0 || err >= 256);
 337
 338         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 339         pfkey_hdr_dup(hdr, orig);
 340         hdr->sadb_msg_errno = (uint8_t) err;
 341         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 342                              sizeof(uint64_t));
 343
 344         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 345
 346         return 0;
 347 }
 348
 349 static u8 sadb_ext_min_len[] = {
 350         [SADB_EXT_RESERVED]             = (u8) 0,
 351         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 352         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 353         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 354         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 355         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 356         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 357         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 358         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 359         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 360         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 361         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 362         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 363         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 364         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 365         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 366         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 367         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 368         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 369         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 370         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 371         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 372         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 373         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 374         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 375 };
 376
 377 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 378 static int verify_address_len(void *p)
 379 {
 380         struct sadb_address *sp = p;
 381         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 382         struct sockaddr_in *sin;
 383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 384         struct sockaddr_in6 *sin6;
 385 #endif
 386         int len;
 387
 388         switch (addr->sa_family) {
 389         case AF_INET:
 390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 391                 if (sp->sadb_address_len != len ||
 392                     sp->sadb_address_prefixlen > 32)
 393                         return -EINVAL;
 394                 break;
 395 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 396         case AF_INET6:
 397                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 398                 if (sp->sadb_address_len != len ||
 399                     sp->sadb_address_prefixlen > 128)
 400                         return -EINVAL;
 401                 break;
 402 #endif
 403         default:
 404                 /* It is user using kernel to keep track of security
 405                  * associations for another protocol, such as
 406                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 407                  * lengths.
 408                  *
 409                  * XXX Actually, association/policy database is not yet
 410                  * XXX able to cope with arbitrary sockaddr families.
 411                  * XXX When it can, remove this -EINVAL.  -DaveM
 412                  */
 413                 return -EINVAL;
 414                 break;
 415         }
 416
 417         return 0;
 418 }
 419
 420 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 421 {
 422         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 423                             sec_ctx->sadb_x_ctx_len,
 424                             sizeof(uint64_t));
 425 }
 426
 427 static inline int verify_sec_ctx_len(void *p)
 428 {
 429         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 430         int len = sec_ctx->sadb_x_ctx_len;
 431
 432         if (len > PAGE_SIZE)
 433                 return -EINVAL;
 434
 435         len = pfkey_sec_ctx_len(sec_ctx);
 436
 437         if (sec_ctx->sadb_x_sec_len != len)
 438                 return -EINVAL;
 439
 440         return 0;
 441 }
 442
 443 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 444 {
 445         struct xfrm_user_sec_ctx *uctx = NULL;
 446         int ctx_size = sec_ctx->sadb_x_ctx_len;
 447
 448         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 449
 450         if (!uctx)
 451                 return NULL;
 452
 453         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 454         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 455         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 456         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 457         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 458         memcpy(uctx + 1, sec_ctx + 1,
 459                uctx->ctx_len);
 460
 461         return uctx;
 462 }
 463
 464 static int present_and_same_family(struct sadb_address *src,
 465                                    struct sadb_address *dst)
 466 {
 467         struct sockaddr *s_addr, *d_addr;
 468
 469         if (!src || !dst)
 470                 return 0;
 471
 472         s_addr = (struct sockaddr *)(src + 1);
 473         d_addr = (struct sockaddr *)(dst + 1);
 474         if (s_addr->sa_family != d_addr->sa_family)
 475                 return 0;
 476         if (s_addr->sa_family != AF_INET
 477 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 478             && s_addr->sa_family != AF_INET6
 479 #endif
 480                 )
 481                 return 0;
 482
 483         return 1;
 484 }
 485
 486 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 487 {
 488         char *p = (char *) hdr;
 489         int len = skb->len;
 490
 491         len -= sizeof(*hdr);
 492         p += sizeof(*hdr);
 493         while (len > 0) {
 494                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 495                 uint16_t ext_type;
 496                 int ext_len;
 497
 498                 ext_len  = ehdr->sadb_ext_len;
 499                 ext_len *= sizeof(uint64_t);
 500                 ext_type = ehdr->sadb_ext_type;
 501                 if (ext_len < sizeof(uint64_t) ||
 502                     ext_len > len ||
 503                     ext_type == SADB_EXT_RESERVED)
 504                         return -EINVAL;
 505
 506                 if (ext_type <= SADB_EXT_MAX) {
 507                         int min = (int) sadb_ext_min_len[ext_type];
 508                         if (ext_len < min)
 509                                 return -EINVAL;
 510                         if (ext_hdrs[ext_type-1] != NULL)
 511                                 return -EINVAL;
 512                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 513                             ext_type == SADB_EXT_ADDRESS_DST ||
 514                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 515                             ext_type == SADB_X_EXT_NAT_T_OA) {
 516                                 if (verify_address_len(p))
 517                                         return -EINVAL;
 518                         }
 519                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 520                                 if (verify_sec_ctx_len(p))
 521                                         return -EINVAL;
 522                         }
 523                         ext_hdrs[ext_type-1] = p;
 524                 }
 525                 p   += ext_len;
 526                 len -= ext_len;
 527         }
 528
 529         return 0;
 530 }
 531
 532 static uint16_t
 533 pfkey_satype2proto(uint8_t satype)
 534 {
 535         switch (satype) {
 536         case SADB_SATYPE_UNSPEC:
 537                 return IPSEC_PROTO_ANY;
 538         case SADB_SATYPE_AH:
 539                 return IPPROTO_AH;
 540         case SADB_SATYPE_ESP:
 541                 return IPPROTO_ESP;
 542         case SADB_X_SATYPE_IPCOMP:
 543                 return IPPROTO_COMP;
 544                 break;
 545         default:
 546                 return 0;
 547         }
 548         /* NOTREACHED */
 549 }
 550
 551 static uint8_t
 552 pfkey_proto2satype(uint16_t proto)
 553 {
 554         switch (proto) {
 555         case IPPROTO_AH:
 556                 return SADB_SATYPE_AH;
 557         case IPPROTO_ESP:
 558                 return SADB_SATYPE_ESP;
 559         case IPPROTO_COMP:
 560                 return SADB_X_SATYPE_IPCOMP;
 561                 break;
 562         default:
 563                 return 0;
 564         }
 565         /* NOTREACHED */
 566 }
 567
 568 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 569  * say specifically 'just raw sockets' as we encode them as 255.
 570  */
 571
 572 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 573 {
 574         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 575 }
 576
 577 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 578 {
 579         return (proto ? proto : IPSEC_PROTO_ANY);
 580 }
 581
 582 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 583                                      xfrm_address_t *xaddr)
 584 {
 585         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 586         case AF_INET:
 587                 xaddr->a4 =
 588                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 589                 return AF_INET;
 590 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 591         case AF_INET6:
 592                 memcpy(xaddr->a6,
 593                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 594                        sizeof(struct in6_addr));
 595                 return AF_INET6;
 596 #endif
 597         default:
 598                 return 0;
 599         }
 600         /* NOTREACHED */
 601 }
 602
 603 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 604 {
 605         struct sadb_sa *sa;
 606         struct sadb_address *addr;
 607         uint16_t proto;
 608         unsigned short family;
 609         xfrm_address_t *xaddr;
 610
 611         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 612         if (sa == NULL)
 613                 return NULL;
 614
 615         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 616         if (proto == 0)
 617                 return NULL;
 618
 619         /* sadb_address_len should be checked by caller */
 620         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 621         if (addr == NULL)
 622                 return NULL;
 623
 624         family = ((struct sockaddr *)(addr + 1))->sa_family;
 625         switch (family) {
 626         case AF_INET:
 627                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 628                 break;
 629 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 630         case AF_INET6:
 631                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 632                 break;
 633 #endif
 634         default:
 635                 xaddr = NULL;
 636         }
 637
 638         if (!xaddr)
 639                 return NULL;
 640
 641         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 642 }
 643
 644 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 645 static int
 646 pfkey_sockaddr_size(sa_family_t family)
 647 {
 648         switch (family) {
 649         case AF_INET:
 650                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
 651 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 652         case AF_INET6:
 653                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
 654 #endif
 655         default:
 656                 return 0;
 657         }
 658         /* NOTREACHED */
 659 }
 660
 661 static inline int pfkey_mode_from_xfrm(int mode)
 662 {
 663         switch(mode) {
 664         case XFRM_MODE_TRANSPORT:
 665                 return IPSEC_MODE_TRANSPORT;
 666         case XFRM_MODE_TUNNEL:
 667                 return IPSEC_MODE_TUNNEL;
 668         case XFRM_MODE_BEET:
 669                 return IPSEC_MODE_BEET;
 670         default:
 671                 return -1;
 672         }
 673 }
 674
 675 static inline int pfkey_mode_to_xfrm(int mode)
 676 {
 677         switch(mode) {
 678         case IPSEC_MODE_ANY:    /*XXX*/
 679         case IPSEC_MODE_TRANSPORT:
 680                 return XFRM_MODE_TRANSPORT;
 681         case IPSEC_MODE_TUNNEL:
 682                 return XFRM_MODE_TUNNEL;
 683         case IPSEC_MODE_BEET:
 684                 return XFRM_MODE_BEET;
 685         default:
 686                 return -1;
 687         }
 688 }
 689
 690 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
 691                                               int add_keys, int hsc)
 692 {
 693         struct sk_buff *skb;
 694         struct sadb_msg *hdr;
 695         struct sadb_sa *sa;
 696         struct sadb_lifetime *lifetime;
 697         struct sadb_address *addr;
 698         struct sadb_key *key;
 699         struct sadb_x_sa2 *sa2;
 700         struct sockaddr_in *sin;
 701         struct sadb_x_sec_ctx *sec_ctx;
 702         struct xfrm_sec_ctx *xfrm_ctx;
 703         int ctx_size = 0;
 704 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 705         struct sockaddr_in6 *sin6;
 706 #endif
 707         int size;
 708         int auth_key_size = 0;
 709         int encrypt_key_size = 0;
 710         int sockaddr_size;
 711         struct xfrm_encap_tmpl *natt = NULL;
 712         int mode;
 713
 714         /* address family check */
 715         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 716         if (!sockaddr_size)
 717                 return ERR_PTR(-EINVAL);
 718
 719         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 720            key(AE), (identity(SD),) (sensitivity)> */
 721         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 722                 sizeof(struct sadb_lifetime) +
 723                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 724                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 725                         sizeof(struct sadb_address)*2 +
 726                                 sockaddr_size*2 +
 727                                         sizeof(struct sadb_x_sa2);
 728
 729         if ((xfrm_ctx = x->security)) {
 730                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 731                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 732         }
 733
 734         /* identity & sensitivity */
 735
 736         if ((x->props.family == AF_INET &&
 737              x->sel.saddr.a4 != x->props.saddr.a4)
 738 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 739             || (x->props.family == AF_INET6 &&
 740                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 741 #endif
 742                 )
 743                 size += sizeof(struct sadb_address) + sockaddr_size;
 744
 745         if (add_keys) {
 746                 if (x->aalg && x->aalg->alg_key_len) {
 747                         auth_key_size =
 748                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 749                         size += sizeof(struct sadb_key) + auth_key_size;
 750                 }
 751                 if (x->ealg && x->ealg->alg_key_len) {
 752                         encrypt_key_size =
 753                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 754                         size += sizeof(struct sadb_key) + encrypt_key_size;
 755                 }
 756         }
 757         if (x->encap)
 758                 natt = x->encap;
 759
 760         if (natt && natt->encap_type) {
 761                 size += sizeof(struct sadb_x_nat_t_type);
 762                 size += sizeof(struct sadb_x_nat_t_port);
 763                 size += sizeof(struct sadb_x_nat_t_port);
 764         }
 765
 766         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 767         if (skb == NULL)
 768                 return ERR_PTR(-ENOBUFS);
 769
 770         /* call should fill header later */
 771         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 772         memset(hdr, 0, size);   /* XXX do we need this ? */
 773         hdr->sadb_msg_len = size / sizeof(uint64_t);
 774
 775         /* sa */
 776         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 777         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 778         sa->sadb_sa_exttype = SADB_EXT_SA;
 779         sa->sadb_sa_spi = x->id.spi;
 780         sa->sadb_sa_replay = x->props.replay_window;
 781         switch (x->km.state) {
 782         case XFRM_STATE_VALID:
 783                 sa->sadb_sa_state = x->km.dying ?
 784                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 785                 break;
 786         case XFRM_STATE_ACQ:
 787                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 788                 break;
 789         default:
 790                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 791                 break;
 792         }
 793         sa->sadb_sa_auth = 0;
 794         if (x->aalg) {
 795                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 796                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 797         }
 798         sa->sadb_sa_encrypt = 0;
 799         BUG_ON(x->ealg && x->calg);
 800         if (x->ealg) {
 801                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 802                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 803         }
 804         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 805         if (x->calg) {
 806                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 807                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 808         }
 809
 810         sa->sadb_sa_flags = 0;
 811         if (x->props.flags & XFRM_STATE_NOECN)
 812                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 813         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 814                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 815         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 816                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 817
 818         /* hard time */
 819         if (hsc & 2) {
 820                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 821                                                              sizeof(struct sadb_lifetime));
 822                 lifetime->sadb_lifetime_len =
 823                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 824                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 825                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 826                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 827                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 828                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 829         }
 830         /* soft time */
 831         if (hsc & 1) {
 832                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 833                                                              sizeof(struct sadb_lifetime));
 834                 lifetime->sadb_lifetime_len =
 835                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 836                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 837                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 838                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 839                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 840                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 841         }
 842         /* current time */
 843         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 844                                                      sizeof(struct sadb_lifetime));
 845         lifetime->sadb_lifetime_len =
 846                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 847         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 848         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 849         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 850         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 851         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 852         /* src address */
 853         addr = (struct sadb_address*) skb_put(skb,
 854                                               sizeof(struct sadb_address)+sockaddr_size);
 855         addr->sadb_address_len =
 856                 (sizeof(struct sadb_address)+sockaddr_size)/
 857                         sizeof(uint64_t);
 858         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 859         /* "if the ports are non-zero, then the sadb_address_proto field,
 860            normally zero, MUST be filled in with the transport
 861            protocol's number." - RFC2367 */
 862         addr->sadb_address_proto = 0;
 863         addr->sadb_address_reserved = 0;
 864         if (x->props.family == AF_INET) {
 865                 addr->sadb_address_prefixlen = 32;
 866
 867                 sin = (struct sockaddr_in *) (addr + 1);
 868                 sin->sin_family = AF_INET;
 869                 sin->sin_addr.s_addr = x->props.saddr.a4;
 870                 sin->sin_port = 0;
 871                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 872         }
 873 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 874         else if (x->props.family == AF_INET6) {
 875                 addr->sadb_address_prefixlen = 128;
 876
 877                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 878                 sin6->sin6_family = AF_INET6;
 879                 sin6->sin6_port = 0;
 880                 sin6->sin6_flowinfo = 0;
 881                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 882                        sizeof(struct in6_addr));
 883                 sin6->sin6_scope_id = 0;
 884         }
 885 #endif
 886         else
 887                 BUG();
 888
 889         /* dst address */
 890         addr = (struct sadb_address*) skb_put(skb,
 891                                               sizeof(struct sadb_address)+sockaddr_size);
 892         addr->sadb_address_len =
 893                 (sizeof(struct sadb_address)+sockaddr_size)/
 894                         sizeof(uint64_t);
 895         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 896         addr->sadb_address_proto = 0;
 897         addr->sadb_address_prefixlen = 32; /* XXX */
 898         addr->sadb_address_reserved = 0;
 899         if (x->props.family == AF_INET) {
 900                 sin = (struct sockaddr_in *) (addr + 1);
 901                 sin->sin_family = AF_INET;
 902                 sin->sin_addr.s_addr = x->id.daddr.a4;
 903                 sin->sin_port = 0;
 904                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 905
 906                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 907                         addr = (struct sadb_address*) skb_put(skb,
 908                                 sizeof(struct sadb_address)+sockaddr_size);
 909                         addr->sadb_address_len =
 910                                 (sizeof(struct sadb_address)+sockaddr_size)/
 911                                 sizeof(uint64_t);
 912                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 913                         addr->sadb_address_proto =
 914                                 pfkey_proto_from_xfrm(x->sel.proto);
 915                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 916                         addr->sadb_address_reserved = 0;
 917
 918                         sin = (struct sockaddr_in *) (addr + 1);
 919                         sin->sin_family = AF_INET;
 920                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 921                         sin->sin_port = x->sel.sport;
 922                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 923                 }
 924         }
 925 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 926         else if (x->props.family == AF_INET6) {
 927                 addr->sadb_address_prefixlen = 128;
 928
 929                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 930                 sin6->sin6_family = AF_INET6;
 931                 sin6->sin6_port = 0;
 932                 sin6->sin6_flowinfo = 0;
 933                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 934                 sin6->sin6_scope_id = 0;
 935
 936                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 937                             sizeof(struct in6_addr))) {
 938                         addr = (struct sadb_address *) skb_put(skb,
 939                                 sizeof(struct sadb_address)+sockaddr_size);
 940                         addr->sadb_address_len =
 941                                 (sizeof(struct sadb_address)+sockaddr_size)/
 942                                 sizeof(uint64_t);
 943                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 944                         addr->sadb_address_proto =
 945                                 pfkey_proto_from_xfrm(x->sel.proto);
 946                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 947                         addr->sadb_address_reserved = 0;
 948
 949                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 950                         sin6->sin6_family = AF_INET6;
 951                         sin6->sin6_port = x->sel.sport;
 952                         sin6->sin6_flowinfo = 0;
 953                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 954                                sizeof(struct in6_addr));
 955                         sin6->sin6_scope_id = 0;
 956                 }
 957         }
 958 #endif
 959         else
 960                 BUG();
 961
 962         /* auth key */
 963         if (add_keys && auth_key_size) {
 964                 key = (struct sadb_key *) skb_put(skb,
 965                                                   sizeof(struct sadb_key)+auth_key_size);
 966                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 967                         sizeof(uint64_t);
 968                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 969                 key->sadb_key_bits = x->aalg->alg_key_len;
 970                 key->sadb_key_reserved = 0;
 971                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 972         }
 973         /* encrypt key */
 974         if (add_keys && encrypt_key_size) {
 975                 key = (struct sadb_key *) skb_put(skb,
 976                                                   sizeof(struct sadb_key)+encrypt_key_size);
 977                 key->sadb_key_len = (sizeof(struct sadb_key) +
 978                                      encrypt_key_size) / sizeof(uint64_t);
 979                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 980                 key->sadb_key_bits = x->ealg->alg_key_len;
 981                 key->sadb_key_reserved = 0;
 982                 memcpy(key + 1, x->ealg->alg_key,
 983                        (x->ealg->alg_key_len+7)/8);
 984         }
 985
 986         /* sa */
 987         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 988         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 989         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 990         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 991                 kfree_skb(skb);
 992                 return ERR_PTR(-EINVAL);
 993         }
 994         sa2->sadb_x_sa2_mode = mode;
 995         sa2->sadb_x_sa2_reserved1 = 0;
 996         sa2->sadb_x_sa2_reserved2 = 0;
 997         sa2->sadb_x_sa2_sequence = 0;
 998         sa2->sadb_x_sa2_reqid = x->props.reqid;
 999
1000         if (natt && natt->encap_type) {
1001                 struct sadb_x_nat_t_type *n_type;
1002                 struct sadb_x_nat_t_port *n_port;
1003
1004                 /* type */
1005                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1006                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1007                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1008                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1009                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1010                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1011                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1012
1013                 /* source port */
1014                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1015                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1016                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1017                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1018                 n_port->sadb_x_nat_t_port_reserved = 0;
1019
1020                 /* dest port */
1021                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1022                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1023                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1024                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1025                 n_port->sadb_x_nat_t_port_reserved = 0;
1026         }
1027
1028         /* security context */
1029         if (xfrm_ctx) {
1030                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1031                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1032                 sec_ctx->sadb_x_sec_len =
1033                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1034                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1035                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1036                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1037                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1038                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1039                        xfrm_ctx->ctx_len);
1040         }
1041
1042         return skb;
1043 }
1044
1045
1046 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1047 {
1048         struct sk_buff *skb;
1049
1050         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1051
1052         return skb;
1053 }
1054
1055 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1056                                                           int hsc)
1057 {
1058         return __pfkey_xfrm_state2msg(x, 0, hsc);
1059 }
1060
1061 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
1062                                                 void **ext_hdrs)
1063 {
1064         struct xfrm_state *x;
1065         struct sadb_lifetime *lifetime;
1066         struct sadb_sa *sa;
1067         struct sadb_key *key;
1068         struct sadb_x_sec_ctx *sec_ctx;
1069         uint16_t proto;
1070         int err;
1071
1072
1073         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1074         if (!sa ||
1075             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1076                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1077                 return ERR_PTR(-EINVAL);
1078         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1079             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1080                 return ERR_PTR(-EINVAL);
1081         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1082             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1083                 return ERR_PTR(-EINVAL);
1084         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1085             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1086                 return ERR_PTR(-EINVAL);
1087
1088         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1089         if (proto == 0)
1090                 return ERR_PTR(-EINVAL);
1091
1092         /* default error is no buffer space */
1093         err = -ENOBUFS;
1094
1095         /* RFC2367:
1096
1097    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1098    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1099    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1100    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1101    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1102    not true.
1103
1104            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1105            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1106          */
1107         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1108             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1109              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1110             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1111                 return ERR_PTR(-EINVAL);
1112         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1113         if (key != NULL &&
1114             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1115             ((key->sadb_key_bits+7) / 8 == 0 ||
1116              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1117                 return ERR_PTR(-EINVAL);
1118         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1119         if (key != NULL &&
1120             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1121             ((key->sadb_key_bits+7) / 8 == 0 ||
1122              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1123                 return ERR_PTR(-EINVAL);
1124
1125         x = xfrm_state_alloc();
1126         if (x == NULL)
1127                 return ERR_PTR(-ENOBUFS);
1128
1129         x->id.proto = proto;
1130         x->id.spi = sa->sadb_sa_spi;
1131         x->props.replay_window = sa->sadb_sa_replay;
1132         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1133                 x->props.flags |= XFRM_STATE_NOECN;
1134         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1135                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1136         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1137                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1138
1139         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1140         if (lifetime != NULL) {
1141                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1142                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1143                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1144                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1145         }
1146         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1147         if (lifetime != NULL) {
1148                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1149                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1150                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1151                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1152         }
1153
1154         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1155         if (sec_ctx != NULL) {
1156                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1157
1158                 if (!uctx)
1159                         goto out;
1160
1161                 err = security_xfrm_state_alloc(x, uctx);
1162                 kfree(uctx);
1163
1164                 if (err)
1165                         goto out;
1166         }
1167
1168         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1169         if (sa->sadb_sa_auth) {
1170                 int keysize = 0;
1171                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1172                 if (!a) {
1173                         err = -ENOSYS;
1174                         goto out;
1175                 }
1176                 if (key)
1177                         keysize = (key->sadb_key_bits + 7) / 8;
1178                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1179                 if (!x->aalg)
1180                         goto out;
1181                 strcpy(x->aalg->alg_name, a->name);
1182                 x->aalg->alg_key_len = 0;
1183                 if (key) {
1184                         x->aalg->alg_key_len = key->sadb_key_bits;
1185                         memcpy(x->aalg->alg_key, key+1, keysize);
1186                 }
1187                 x->props.aalgo = sa->sadb_sa_auth;
1188                 /* x->algo.flags = sa->sadb_sa_flags; */
1189         }
1190         if (sa->sadb_sa_encrypt) {
1191                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1192                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1193                         if (!a) {
1194                                 err = -ENOSYS;
1195                                 goto out;
1196                         }
1197                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1198                         if (!x->calg)
1199                                 goto out;
1200                         strcpy(x->calg->alg_name, a->name);
1201                         x->props.calgo = sa->sadb_sa_encrypt;
1202                 } else {
1203                         int keysize = 0;
1204                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1205                         if (!a) {
1206                                 err = -ENOSYS;
1207                                 goto out;
1208                         }
1209                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1210                         if (key)
1211                                 keysize = (key->sadb_key_bits + 7) / 8;
1212                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1213                         if (!x->ealg)
1214                                 goto out;
1215                         strcpy(x->ealg->alg_name, a->name);
1216                         x->ealg->alg_key_len = 0;
1217                         if (key) {
1218                                 x->ealg->alg_key_len = key->sadb_key_bits;
1219                                 memcpy(x->ealg->alg_key, key+1, keysize);
1220                         }
1221                         x->props.ealgo = sa->sadb_sa_encrypt;
1222                 }
1223         }
1224         /* x->algo.flags = sa->sadb_sa_flags; */
1225
1226         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1227                                                     &x->props.saddr);
1228         if (!x->props.family) {
1229                 err = -EAFNOSUPPORT;
1230                 goto out;
1231         }
1232         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1233                                   &x->id.daddr);
1234
1235         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1236                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1237                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1238                 if (mode < 0) {
1239                         err = -EINVAL;
1240                         goto out;
1241                 }
1242                 x->props.mode = mode;
1243                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1244         }
1245
1246         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1247                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1248
1249                 /* Nobody uses this, but we try. */
1250                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1251                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1252         }
1253
1254         if (!x->sel.family)
1255                 x->sel.family = x->props.family;
1256
1257         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1258                 struct sadb_x_nat_t_type* n_type;
1259                 struct xfrm_encap_tmpl *natt;
1260
1261                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1262                 if (!x->encap)
1263                         goto out;
1264
1265                 natt = x->encap;
1266                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1267                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1268
1269                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1270                         struct sadb_x_nat_t_port* n_port =
1271                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1272                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1273                 }
1274                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1275                         struct sadb_x_nat_t_port* n_port =
1276                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1277                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1278                 }
1279         }
1280
1281         err = xfrm_init_state(x);
1282         if (err)
1283                 goto out;
1284
1285         x->km.seq = hdr->sadb_msg_seq;
1286         return x;
1287
1288 out:
1289         x->km.state = XFRM_STATE_DEAD;
1290         xfrm_state_put(x);
1291         return ERR_PTR(err);
1292 }
1293
1294 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1295 {
1296         return -EOPNOTSUPP;
1297 }
1298
1299 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1300 {
1301         struct sk_buff *resp_skb;
1302         struct sadb_x_sa2 *sa2;
1303         struct sadb_address *saddr, *daddr;
1304         struct sadb_msg *out_hdr;
1305         struct sadb_spirange *range;
1306         struct xfrm_state *x = NULL;
1307         int mode;
1308         int err;
1309         u32 min_spi, max_spi;
1310         u32 reqid;
1311         u8 proto;
1312         unsigned short family;
1313         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1314
1315         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1316                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1317                 return -EINVAL;
1318
1319         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1320         if (proto == 0)
1321                 return -EINVAL;
1322
1323         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1324                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1325                 if (mode < 0)
1326                         return -EINVAL;
1327                 reqid = sa2->sadb_x_sa2_reqid;
1328         } else {
1329                 mode = 0;
1330                 reqid = 0;
1331         }
1332
1333         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1334         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1335
1336         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1337         switch (family) {
1338         case AF_INET:
1339                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1340                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1341                 break;
1342 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1343         case AF_INET6:
1344                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1345                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1346                 break;
1347 #endif
1348         }
1349
1350         if (hdr->sadb_msg_seq) {
1351                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1352                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1353                         xfrm_state_put(x);
1354                         x = NULL;
1355                 }
1356         }
1357
1358         if (!x)
1359                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1360
1361         if (x == NULL)
1362                 return -ENOENT;
1363
1364         min_spi = 0x100;
1365         max_spi = 0x0fffffff;
1366
1367         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1368         if (range) {
1369                 min_spi = range->sadb_spirange_min;
1370                 max_spi = range->sadb_spirange_max;
1371         }
1372
1373         err = xfrm_alloc_spi(x, min_spi, max_spi);
1374         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1375
1376         if (IS_ERR(resp_skb)) {
1377                 xfrm_state_put(x);
1378                 return  PTR_ERR(resp_skb);
1379         }
1380
1381         out_hdr = (struct sadb_msg *) resp_skb->data;
1382         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1383         out_hdr->sadb_msg_type = SADB_GETSPI;
1384         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1385         out_hdr->sadb_msg_errno = 0;
1386         out_hdr->sadb_msg_reserved = 0;
1387         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1388         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1389
1390         xfrm_state_put(x);
1391
1392         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1393
1394         return 0;
1395 }
1396
1397 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1398 {
1399         struct xfrm_state *x;
1400
1401         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1402                 return -EOPNOTSUPP;
1403
1404         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1405                 return 0;
1406
1407         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1408         if (x == NULL)
1409                 return 0;
1410
1411         spin_lock_bh(&x->lock);
1412         if (x->km.state == XFRM_STATE_ACQ) {
1413                 x->km.state = XFRM_STATE_ERROR;
1414                 wake_up(&km_waitq);
1415         }
1416         spin_unlock_bh(&x->lock);
1417         xfrm_state_put(x);
1418         return 0;
1419 }
1420
1421 static inline int event2poltype(int event)
1422 {
1423         switch (event) {
1424         case XFRM_MSG_DELPOLICY:
1425                 return SADB_X_SPDDELETE;
1426         case XFRM_MSG_NEWPOLICY:
1427                 return SADB_X_SPDADD;
1428         case XFRM_MSG_UPDPOLICY:
1429                 return SADB_X_SPDUPDATE;
1430         case XFRM_MSG_POLEXPIRE:
1431         //      return SADB_X_SPDEXPIRE;
1432         default:
1433                 printk("pfkey: Unknown policy event %d\n", event);
1434                 break;
1435         }
1436
1437         return 0;
1438 }
1439
1440 static inline int event2keytype(int event)
1441 {
1442         switch (event) {
1443         case XFRM_MSG_DELSA:
1444                 return SADB_DELETE;
1445         case XFRM_MSG_NEWSA:
1446                 return SADB_ADD;
1447         case XFRM_MSG_UPDSA:
1448                 return SADB_UPDATE;
1449         case XFRM_MSG_EXPIRE:
1450                 return SADB_EXPIRE;
1451         default:
1452                 printk("pfkey: Unknown SA event %d\n", event);
1453                 break;
1454         }
1455
1456         return 0;
1457 }
1458
1459 /* ADD/UPD/DEL */
1460 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1461 {
1462         struct sk_buff *skb;
1463         struct sadb_msg *hdr;
1464
1465         skb = pfkey_xfrm_state2msg(x);
1466
1467         if (IS_ERR(skb))
1468                 return PTR_ERR(skb);
1469
1470         hdr = (struct sadb_msg *) skb->data;
1471         hdr->sadb_msg_version = PF_KEY_V2;
1472         hdr->sadb_msg_type = event2keytype(c->event);
1473         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1474         hdr->sadb_msg_errno = 0;
1475         hdr->sadb_msg_reserved = 0;
1476         hdr->sadb_msg_seq = c->seq;
1477         hdr->sadb_msg_pid = c->pid;
1478
1479         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1480
1481         return 0;
1482 }
1483
1484 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1485 {
1486         struct xfrm_state *x;
1487         int err;
1488         struct km_event c;
1489
1490         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1491         if (IS_ERR(x))
1492                 return PTR_ERR(x);
1493
1494         xfrm_state_hold(x);
1495         if (hdr->sadb_msg_type == SADB_ADD)
1496                 err = xfrm_state_add(x);
1497         else
1498                 err = xfrm_state_update(x);
1499
1500         xfrm_audit_state_add(x, err ? 0 : 1,
1501                              audit_get_loginuid(current),
1502                              audit_get_sessionid(current), 0);
1503
1504         if (err < 0) {
1505                 x->km.state = XFRM_STATE_DEAD;
1506                 __xfrm_state_put(x);
1507                 goto out;
1508         }
1509
1510         if (hdr->sadb_msg_type == SADB_ADD)
1511                 c.event = XFRM_MSG_NEWSA;
1512         else
1513                 c.event = XFRM_MSG_UPDSA;
1514         c.seq = hdr->sadb_msg_seq;
1515         c.pid = hdr->sadb_msg_pid;
1516         km_state_notify(x, &c);
1517 out:
1518         xfrm_state_put(x);
1519         return err;
1520 }
1521
1522 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1523 {
1524         struct xfrm_state *x;
1525         struct km_event c;
1526         int err;
1527
1528         if (!ext_hdrs[SADB_EXT_SA-1] ||
1529             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1530                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1531                 return -EINVAL;
1532
1533         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1534         if (x == NULL)
1535                 return -ESRCH;
1536
1537         if ((err = security_xfrm_state_delete(x)))
1538                 goto out;
1539
1540         if (xfrm_state_kern(x)) {
1541                 err = -EPERM;
1542                 goto out;
1543         }
1544
1545         err = xfrm_state_delete(x);
1546
1547         if (err < 0)
1548                 goto out;
1549
1550         c.seq = hdr->sadb_msg_seq;
1551         c.pid = hdr->sadb_msg_pid;
1552         c.event = XFRM_MSG_DELSA;
1553         km_state_notify(x, &c);
1554 out:
1555         xfrm_audit_state_delete(x, err ? 0 : 1,
1556                                 audit_get_loginuid(current),
1557                                 audit_get_sessionid(current), 0);
1558         xfrm_state_put(x);
1559
1560         return err;
1561 }
1562
1563 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1564 {
1565         __u8 proto;
1566         struct sk_buff *out_skb;
1567         struct sadb_msg *out_hdr;
1568         struct xfrm_state *x;
1569
1570         if (!ext_hdrs[SADB_EXT_SA-1] ||
1571             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1572                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1573                 return -EINVAL;
1574
1575         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1576         if (x == NULL)
1577                 return -ESRCH;
1578
1579         out_skb = pfkey_xfrm_state2msg(x);
1580         proto = x->id.proto;
1581         xfrm_state_put(x);
1582         if (IS_ERR(out_skb))
1583                 return  PTR_ERR(out_skb);
1584
1585         out_hdr = (struct sadb_msg *) out_skb->data;
1586         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1587         out_hdr->sadb_msg_type = SADB_GET;
1588         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1589         out_hdr->sadb_msg_errno = 0;
1590         out_hdr->sadb_msg_reserved = 0;
1591         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1592         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1593         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1594
1595         return 0;
1596 }
1597
1598 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1599                                               gfp_t allocation)
1600 {
1601         struct sk_buff *skb;
1602         struct sadb_msg *hdr;
1603         int len, auth_len, enc_len, i;
1604
1605         auth_len = xfrm_count_auth_supported();
1606         if (auth_len) {
1607                 auth_len *= sizeof(struct sadb_alg);
1608                 auth_len += sizeof(struct sadb_supported);
1609         }
1610
1611         enc_len = xfrm_count_enc_supported();
1612         if (enc_len) {
1613                 enc_len *= sizeof(struct sadb_alg);
1614                 enc_len += sizeof(struct sadb_supported);
1615         }
1616
1617         len = enc_len + auth_len + sizeof(struct sadb_msg);
1618
1619         skb = alloc_skb(len + 16, allocation);
1620         if (!skb)
1621                 goto out_put_algs;
1622
1623         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1624         pfkey_hdr_dup(hdr, orig);
1625         hdr->sadb_msg_errno = 0;
1626         hdr->sadb_msg_len = len / sizeof(uint64_t);
1627
1628         if (auth_len) {
1629                 struct sadb_supported *sp;
1630                 struct sadb_alg *ap;
1631
1632                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1633                 ap = (struct sadb_alg *) (sp + 1);
1634
1635                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1636                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1637
1638                 for (i = 0; ; i++) {
1639                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1640                         if (!aalg)
1641                                 break;
1642                         if (aalg->available)
1643                                 *ap++ = aalg->desc;
1644                 }
1645         }
1646
1647         if (enc_len) {
1648                 struct sadb_supported *sp;
1649                 struct sadb_alg *ap;
1650
1651                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1652                 ap = (struct sadb_alg *) (sp + 1);
1653
1654                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1655                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1656
1657                 for (i = 0; ; i++) {
1658                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1659                         if (!ealg)
1660                                 break;
1661                         if (ealg->available)
1662                                 *ap++ = ealg->desc;
1663                 }
1664         }
1665
1666 out_put_algs:
1667         return skb;
1668 }
1669
1670 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1671 {
1672         struct pfkey_sock *pfk = pfkey_sk(sk);
1673         struct sk_buff *supp_skb;
1674
1675         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1676                 return -EINVAL;
1677
1678         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1679                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1680                         return -EEXIST;
1681                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1682         }
1683
1684         xfrm_probe_algs();
1685
1686         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1687         if (!supp_skb) {
1688                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1689                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1690
1691                 return -ENOBUFS;
1692         }
1693
1694         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1695
1696         return 0;
1697 }
1698
1699 static int key_notify_sa_flush(struct km_event *c)
1700 {
1701         struct sk_buff *skb;
1702         struct sadb_msg *hdr;
1703
1704         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1705         if (!skb)
1706                 return -ENOBUFS;
1707         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1708         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1709         hdr->sadb_msg_type = SADB_FLUSH;
1710         hdr->sadb_msg_seq = c->seq;
1711         hdr->sadb_msg_pid = c->pid;
1712         hdr->sadb_msg_version = PF_KEY_V2;
1713         hdr->sadb_msg_errno = (uint8_t) 0;
1714         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1715
1716         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1717
1718         return 0;
1719 }
1720
1721 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1722 {
1723         unsigned proto;
1724         struct km_event c;
1725         struct xfrm_audit audit_info;
1726         int err;
1727
1728         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1729         if (proto == 0)
1730                 return -EINVAL;
1731
1732         audit_info.loginuid = audit_get_loginuid(current);
1733         audit_info.sessionid = audit_get_sessionid(current);
1734         audit_info.secid = 0;
1735         err = xfrm_state_flush(proto, &audit_info);
1736         if (err)
1737                 return err;
1738         c.data.proto = proto;
1739         c.seq = hdr->sadb_msg_seq;
1740         c.pid = hdr->sadb_msg_pid;
1741         c.event = XFRM_MSG_FLUSHSA;
1742         km_state_notify(NULL, &c);
1743
1744         return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749         struct pfkey_sock *pfk = ptr;
1750         struct sk_buff *out_skb;
1751         struct sadb_msg *out_hdr;
1752
1753         if (!pfkey_can_dump(&pfk->sk))
1754                 return -ENOBUFS;
1755
1756         out_skb = pfkey_xfrm_state2msg(x);
1757         if (IS_ERR(out_skb))
1758                 return PTR_ERR(out_skb);
1759
1760         out_hdr = (struct sadb_msg *) out_skb->data;
1761         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762         out_hdr->sadb_msg_type = SADB_DUMP;
1763         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764         out_hdr->sadb_msg_errno = 0;
1765         out_hdr->sadb_msg_reserved = 0;
1766         out_hdr->sadb_msg_seq = count;
1767         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1768         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
1769         return 0;
1770 }
1771
1772 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1773 {
1774         return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
1775 }
1776
1777 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1778 {
1779         xfrm_state_walk_done(&pfk->dump.u.state);
1780 }
1781
1782 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1783 {
1784         u8 proto;
1785         struct pfkey_sock *pfk = pfkey_sk(sk);
1786
1787         if (pfk->dump.dump != NULL)
1788                 return -EBUSY;
1789
1790         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1791         if (proto == 0)
1792                 return -EINVAL;
1793
1794         pfk->dump.msg_version = hdr->sadb_msg_version;
1795         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1796         pfk->dump.dump = pfkey_dump_sa;
1797         pfk->dump.done = pfkey_dump_sa_done;
1798         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1799
1800         return pfkey_do_dump(pfk);
1801 }
1802
1803 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1804 {
1805         struct pfkey_sock *pfk = pfkey_sk(sk);
1806         int satype = hdr->sadb_msg_satype;
1807
1808         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1809                 /* XXX we mangle packet... */
1810                 hdr->sadb_msg_errno = 0;
1811                 if (satype != 0 && satype != 1)
1812                         return -EINVAL;
1813                 pfk->promisc = satype;
1814         }
1815         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1816         return 0;
1817 }
1818
1819 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1820 {
1821         int i;
1822         u32 reqid = *(u32*)ptr;
1823
1824         for (i=0; i<xp->xfrm_nr; i++) {
1825                 if (xp->xfrm_vec[i].reqid == reqid)
1826                         return -EEXIST;
1827         }
1828         return 0;
1829 }
1830
1831 static u32 gen_reqid(void)
1832 {
1833         struct xfrm_policy_walk walk;
1834         u32 start;
1835         int rc;
1836         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1837
1838         start = reqid;
1839         do {
1840                 ++reqid;
1841                 if (reqid == 0)
1842                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1843                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1844                 rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
1845                 xfrm_policy_walk_done(&walk);
1846                 if (rc != -EEXIST)
1847                         return reqid;
1848         } while (reqid != start);
1849         return 0;
1850 }
1851
1852 static int
1853 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1854 {
1855         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1856         struct sockaddr_in *sin;
1857 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1858         struct sockaddr_in6 *sin6;
1859 #endif
1860         int mode;
1861
1862         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1863                 return -ELOOP;
1864
1865         if (rq->sadb_x_ipsecrequest_mode == 0)
1866                 return -EINVAL;
1867
1868         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1869         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1870                 return -EINVAL;
1871         t->mode = mode;
1872         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1873                 t->optional = 1;
1874         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1875                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1876                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1877                         t->reqid = 0;
1878                 if (!t->reqid && !(t->reqid = gen_reqid()))
1879                         return -ENOBUFS;
1880         }
1881
1882         /* addresses present only in tunnel mode */
1883         if (t->mode == XFRM_MODE_TUNNEL) {
1884                 struct sockaddr *sa;
1885                 sa = (struct sockaddr *)(rq+1);
1886                 switch(sa->sa_family) {
1887                 case AF_INET:
1888                         sin = (struct sockaddr_in*)sa;
1889                         t->saddr.a4 = sin->sin_addr.s_addr;
1890                         sin++;
1891                         if (sin->sin_family != AF_INET)
1892                                 return -EINVAL;
1893                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1894                         break;
1895 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1896                 case AF_INET6:
1897                         sin6 = (struct sockaddr_in6*)sa;
1898                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1899                         sin6++;
1900                         if (sin6->sin6_family != AF_INET6)
1901                                 return -EINVAL;
1902                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1903                         break;
1904 #endif
1905                 default:
1906                         return -EINVAL;
1907                 }
1908                 t->encap_family = sa->sa_family;
1909         } else
1910                 t->encap_family = xp->family;
1911
1912         /* No way to set this via kame pfkey */
1913         t->allalgs = 1;
1914         xp->xfrm_nr++;
1915         return 0;
1916 }
1917
1918 static int
1919 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1920 {
1921         int err;
1922         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1923         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1924
1925         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1926                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1927                         return err;
1928                 len -= rq->sadb_x_ipsecrequest_len;
1929                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1930         }
1931         return 0;
1932 }
1933
1934 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1935 {
1936   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1937
1938         if (xfrm_ctx) {
1939                 int len = sizeof(struct sadb_x_sec_ctx);
1940                 len += xfrm_ctx->ctx_len;
1941                 return PFKEY_ALIGN8(len);
1942         }
1943         return 0;
1944 }
1945
1946 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1947 {
1948         struct xfrm_tmpl *t;
1949         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1950         int socklen = 0;
1951         int i;
1952
1953         for (i=0; i<xp->xfrm_nr; i++) {
1954                 t = xp->xfrm_vec + i;
1955                 socklen += (t->encap_family == AF_INET ?
1956                             sizeof(struct sockaddr_in) :
1957                             sizeof(struct sockaddr_in6));
1958         }
1959
1960         return sizeof(struct sadb_msg) +
1961                 (sizeof(struct sadb_lifetime) * 3) +
1962                 (sizeof(struct sadb_address) * 2) +
1963                 (sockaddr_size * 2) +
1964                 sizeof(struct sadb_x_policy) +
1965                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1966                 (socklen * 2) +
1967                 pfkey_xfrm_policy2sec_ctx_size(xp);
1968 }
1969
1970 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1971 {
1972         struct sk_buff *skb;
1973         int size;
1974
1975         size = pfkey_xfrm_policy2msg_size(xp);
1976
1977         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1978         if (skb == NULL)
1979                 return ERR_PTR(-ENOBUFS);
1980
1981         return skb;
1982 }
1983
1984 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1985 {
1986         struct sadb_msg *hdr;
1987         struct sadb_address *addr;
1988         struct sadb_lifetime *lifetime;
1989         struct sadb_x_policy *pol;
1990         struct sockaddr_in   *sin;
1991         struct sadb_x_sec_ctx *sec_ctx;
1992         struct xfrm_sec_ctx *xfrm_ctx;
1993 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1994         struct sockaddr_in6  *sin6;
1995 #endif
1996         int i;
1997         int size;
1998         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1999         int socklen = (xp->family == AF_INET ?
2000                        sizeof(struct sockaddr_in) :
2001                        sizeof(struct sockaddr_in6));
2002
2003         size = pfkey_xfrm_policy2msg_size(xp);
2004
2005         /* call should fill header later */
2006         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2007         memset(hdr, 0, size);   /* XXX do we need this ? */
2008
2009         /* src address */
2010         addr = (struct sadb_address*) skb_put(skb,
2011                                               sizeof(struct sadb_address)+sockaddr_size);
2012         addr->sadb_address_len =
2013                 (sizeof(struct sadb_address)+sockaddr_size)/
2014                         sizeof(uint64_t);
2015         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2016         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2017         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2018         addr->sadb_address_reserved = 0;
2019         /* src address */
2020         if (xp->family == AF_INET) {
2021                 sin = (struct sockaddr_in *) (addr + 1);
2022                 sin->sin_family = AF_INET;
2023                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
2024                 sin->sin_port = xp->selector.sport;
2025                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2026         }
2027 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2028         else if (xp->family == AF_INET6) {
2029                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2030                 sin6->sin6_family = AF_INET6;
2031                 sin6->sin6_port = xp->selector.sport;
2032                 sin6->sin6_flowinfo = 0;
2033                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
2034                        sizeof(struct in6_addr));
2035                 sin6->sin6_scope_id = 0;
2036         }
2037 #endif
2038         else
2039                 BUG();
2040
2041         /* dst address */
2042         addr = (struct sadb_address*) skb_put(skb,
2043                                               sizeof(struct sadb_address)+sockaddr_size);
2044         addr->sadb_address_len =
2045                 (sizeof(struct sadb_address)+sockaddr_size)/
2046                         sizeof(uint64_t);
2047         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2048         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2049         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2050         addr->sadb_address_reserved = 0;
2051         if (xp->family == AF_INET) {
2052                 sin = (struct sockaddr_in *) (addr + 1);
2053                 sin->sin_family = AF_INET;
2054                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
2055                 sin->sin_port = xp->selector.dport;
2056                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2057         }
2058 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2059         else if (xp->family == AF_INET6) {
2060                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2061                 sin6->sin6_family = AF_INET6;
2062                 sin6->sin6_port = xp->selector.dport;
2063                 sin6->sin6_flowinfo = 0;
2064                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
2065                        sizeof(struct in6_addr));
2066                 sin6->sin6_scope_id = 0;
2067         }
2068 #endif
2069         else
2070                 BUG();
2071
2072         /* hard time */
2073         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2074                                                      sizeof(struct sadb_lifetime));
2075         lifetime->sadb_lifetime_len =
2076                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2077         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2078         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2079         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2080         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2081         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2082         /* soft time */
2083         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2084                                                      sizeof(struct sadb_lifetime));
2085         lifetime->sadb_lifetime_len =
2086                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2087         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2088         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2089         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2090         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2091         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2092         /* current time */
2093         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2094                                                      sizeof(struct sadb_lifetime));
2095         lifetime->sadb_lifetime_len =
2096                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2097         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2098         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2099         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2100         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2101         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2102
2103         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2104         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2105         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2106         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2107         if (xp->action == XFRM_POLICY_ALLOW) {
2108                 if (xp->xfrm_nr)
2109                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2110                 else
2111                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2112         }
2113         pol->sadb_x_policy_dir = dir+1;
2114         pol->sadb_x_policy_id = xp->index;
2115         pol->sadb_x_policy_priority = xp->priority;
2116
2117         for (i=0; i<xp->xfrm_nr; i++) {
2118                 struct sadb_x_ipsecrequest *rq;
2119                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2120                 int req_size;
2121                 int mode;
2122
2123                 req_size = sizeof(struct sadb_x_ipsecrequest);
2124                 if (t->mode == XFRM_MODE_TUNNEL)
2125                         req_size += ((t->encap_family == AF_INET ?
2126                                      sizeof(struct sockaddr_in) :
2127                                      sizeof(struct sockaddr_in6)) * 2);
2128                 else
2129                         size -= 2*socklen;
2130                 rq = (void*)skb_put(skb, req_size);
2131                 pol->sadb_x_policy_len += req_size/8;
2132                 memset(rq, 0, sizeof(*rq));
2133                 rq->sadb_x_ipsecrequest_len = req_size;
2134                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2135                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2136                         return -EINVAL;
2137                 rq->sadb_x_ipsecrequest_mode = mode;
2138                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2139                 if (t->reqid)
2140                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2141                 if (t->optional)
2142                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2143                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2144                 if (t->mode == XFRM_MODE_TUNNEL) {
2145                         switch (t->encap_family) {
2146                         case AF_INET:
2147                                 sin = (void*)(rq+1);
2148                                 sin->sin_family = AF_INET;
2149                                 sin->sin_addr.s_addr = t->saddr.a4;
2150                                 sin->sin_port = 0;
2151                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2152                                 sin++;
2153                                 sin->sin_family = AF_INET;
2154                                 sin->sin_addr.s_addr = t->id.daddr.a4;
2155                                 sin->sin_port = 0;
2156                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2157                                 break;
2158 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2159                         case AF_INET6:
2160                                 sin6 = (void*)(rq+1);
2161                                 sin6->sin6_family = AF_INET6;
2162                                 sin6->sin6_port = 0;
2163                                 sin6->sin6_flowinfo = 0;
2164                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
2165                                        sizeof(struct in6_addr));
2166                                 sin6->sin6_scope_id = 0;
2167
2168                                 sin6++;
2169                                 sin6->sin6_family = AF_INET6;
2170                                 sin6->sin6_port = 0;
2171                                 sin6->sin6_flowinfo = 0;
2172                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
2173                                        sizeof(struct in6_addr));
2174                                 sin6->sin6_scope_id = 0;
2175                                 break;
2176 #endif
2177                         default:
2178                                 break;
2179                         }
2180                 }
2181         }
2182
2183         /* security context */
2184         if ((xfrm_ctx = xp->security)) {
2185                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2186
2187                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2188                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2189                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2190                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2191                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2192                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2193                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2194                        xfrm_ctx->ctx_len);
2195         }
2196
2197         hdr->sadb_msg_len = size / sizeof(uint64_t);
2198         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2199
2200         return 0;
2201 }
2202
2203 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2204 {
2205         struct sk_buff *out_skb;
2206         struct sadb_msg *out_hdr;
2207         int err;
2208
2209         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2210         if (IS_ERR(out_skb)) {
2211                 err = PTR_ERR(out_skb);
2212                 goto out;
2213         }
2214         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2215         if (err < 0)
2216                 return err;
2217
2218         out_hdr = (struct sadb_msg *) out_skb->data;
2219         out_hdr->sadb_msg_version = PF_KEY_V2;
2220
2221         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2222                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2223         else
2224                 out_hdr->sadb_msg_type = event2poltype(c->event);
2225         out_hdr->sadb_msg_errno = 0;
2226         out_hdr->sadb_msg_seq = c->seq;
2227         out_hdr->sadb_msg_pid = c->pid;
2228         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2229 out:
2230         return 0;
2231
2232 }
2233
2234 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2235 {
2236         int err = 0;
2237         struct sadb_lifetime *lifetime;
2238         struct sadb_address *sa;
2239         struct sadb_x_policy *pol;
2240         struct xfrm_policy *xp;
2241         struct km_event c;
2242         struct sadb_x_sec_ctx *sec_ctx;
2243
2244         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2245                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2246             !ext_hdrs[SADB_X_EXT_POLICY-1])
2247                 return -EINVAL;
2248
2249         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2250         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2251                 return -EINVAL;
2252         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2253                 return -EINVAL;
2254
2255         xp = xfrm_policy_alloc(GFP_KERNEL);
2256         if (xp == NULL)
2257                 return -ENOBUFS;
2258
2259         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2260                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2261         xp->priority = pol->sadb_x_policy_priority;
2262
2263         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2264         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2265         if (!xp->family) {
2266                 err = -EINVAL;
2267                 goto out;
2268         }
2269         xp->selector.family = xp->family;
2270         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2271         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2272         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2273         if (xp->selector.sport)
2274                 xp->selector.sport_mask = htons(0xffff);
2275
2276         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2277         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2278         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2279
2280         /* Amusing, we set this twice.  KAME apps appear to set same value
2281          * in both addresses.
2282          */
2283         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2284
2285         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2286         if (xp->selector.dport)
2287                 xp->selector.dport_mask = htons(0xffff);
2288
2289         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2290         if (sec_ctx != NULL) {
2291                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2292
2293                 if (!uctx) {
2294                         err = -ENOBUFS;
2295                         goto out;
2296                 }
2297
2298                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2299                 kfree(uctx);
2300
2301                 if (err)
2302                         goto out;
2303         }
2304
2305         xp->lft.soft_byte_limit = XFRM_INF;
2306         xp->lft.hard_byte_limit = XFRM_INF;
2307         xp->lft.soft_packet_limit = XFRM_INF;
2308         xp->lft.hard_packet_limit = XFRM_INF;
2309         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2310                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2311                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2312                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2313                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2314         }
2315         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2316                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2317                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2318                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2319                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2320         }
2321         xp->xfrm_nr = 0;
2322         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2323             (err = parse_ipsecrequests(xp, pol)) < 0)
2324                 goto out;
2325
2326         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2327                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2328
2329         xfrm_audit_policy_add(xp, err ? 0 : 1,
2330                               audit_get_loginuid(current),
2331                               audit_get_sessionid(current), 0);
2332
2333         if (err)
2334                 goto out;
2335
2336         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2337                 c.event = XFRM_MSG_UPDPOLICY;
2338         else
2339                 c.event = XFRM_MSG_NEWPOLICY;
2340
2341         c.seq = hdr->sadb_msg_seq;
2342         c.pid = hdr->sadb_msg_pid;
2343
2344         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2345         xfrm_pol_put(xp);
2346         return 0;
2347
2348 out:
2349         xp->dead = 1;
2350         xfrm_policy_destroy(xp);
2351         return err;
2352 }
2353
2354 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2355 {
2356         int err;
2357         struct sadb_address *sa;
2358         struct sadb_x_policy *pol;
2359         struct xfrm_policy *xp;
2360         struct xfrm_selector sel;
2361         struct km_event c;
2362         struct sadb_x_sec_ctx *sec_ctx;
2363         struct xfrm_sec_ctx *pol_ctx = NULL;
2364
2365         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2366                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2367             !ext_hdrs[SADB_X_EXT_POLICY-1])
2368                 return -EINVAL;
2369
2370         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2371         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2372                 return -EINVAL;
2373
2374         memset(&sel, 0, sizeof(sel));
2375
2376         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2377         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2378         sel.prefixlen_s = sa->sadb_address_prefixlen;
2379         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2380         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2381         if (sel.sport)
2382                 sel.sport_mask = htons(0xffff);
2383
2384         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2385         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2386         sel.prefixlen_d = sa->sadb_address_prefixlen;
2387         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2388         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2389         if (sel.dport)
2390                 sel.dport_mask = htons(0xffff);
2391
2392         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2393         if (sec_ctx != NULL) {
2394                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2395
2396                 if (!uctx)
2397                         return -ENOMEM;
2398
2399                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2400                 kfree(uctx);
2401                 if (err)
2402                         return err;
2403         }
2404
2405         xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN,
2406                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2407                                    1, &err);
2408         security_xfrm_policy_free(pol_ctx);
2409         if (xp == NULL)
2410                 return -ENOENT;
2411
2412         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2413                                  audit_get_loginuid(current),
2414                                  audit_get_sessionid(current), 0);
2415
2416         if (err)
2417                 goto out;
2418
2419         c.seq = hdr->sadb_msg_seq;
2420         c.pid = hdr->sadb_msg_pid;
2421         c.event = XFRM_MSG_DELPOLICY;
2422         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2423
2424 out:
2425         xfrm_pol_put(xp);
2426         return err;
2427 }
2428
2429 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2430 {
2431         int err;
2432         struct sk_buff *out_skb;
2433         struct sadb_msg *out_hdr;
2434         err = 0;
2435
2436         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2437         if (IS_ERR(out_skb)) {
2438                 err =  PTR_ERR(out_skb);
2439                 goto out;
2440         }
2441         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2442         if (err < 0)
2443                 goto out;
2444
2445         out_hdr = (struct sadb_msg *) out_skb->data;
2446         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2447         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2448         out_hdr->sadb_msg_satype = 0;
2449         out_hdr->sadb_msg_errno = 0;
2450         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2451         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2452         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2453         err = 0;
2454
2455 out:
2456         return err;
2457 }
2458
2459 #ifdef CONFIG_NET_KEY_MIGRATE
2460 static int pfkey_sockaddr_pair_size(sa_family_t family)
2461 {
2462         switch (family) {
2463         case AF_INET:
2464                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in) * 2);
2465 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2466         case AF_INET6:
2467                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6) * 2);
2468 #endif
2469         default:
2470                 return 0;
2471         }
2472         /* NOTREACHED */
2473 }
2474
2475 static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
2476                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2477                                u16 *family)
2478 {
2479         struct sockaddr *sa = (struct sockaddr *)(rq + 1);
2480         if (rq->sadb_x_ipsecrequest_len <
2481             pfkey_sockaddr_pair_size(sa->sa_family))
2482                 return -EINVAL;
2483
2484         switch (sa->sa_family) {
2485         case AF_INET:
2486                 {
2487                         struct sockaddr_in *sin;
2488                         sin = (struct sockaddr_in *)sa;
2489                         if ((sin+1)->sin_family != AF_INET)
2490                                 return -EINVAL;
2491                         memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4));
2492                         sin++;
2493                         memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4));
2494                         *family = AF_INET;
2495                         break;
2496                 }
2497 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2498         case AF_INET6:
2499                 {
2500                         struct sockaddr_in6 *sin6;
2501                         sin6 = (struct sockaddr_in6 *)sa;
2502                         if ((sin6+1)->sin6_family != AF_INET6)
2503                                 return -EINVAL;
2504                         memcpy(&saddr->a6, &sin6->sin6_addr,
2505                                sizeof(saddr->a6));
2506                         sin6++;
2507                         memcpy(&daddr->a6, &sin6->sin6_addr,
2508                                sizeof(daddr->a6));
2509                         *family = AF_INET6;
2510                         break;
2511                 }
2512 #endif
2513         default:
2514                 return -EINVAL;
2515         }
2516
2517         return 0;
2518 }
2519
2520 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2521                                     struct xfrm_migrate *m)
2522 {
2523         int err;
2524         struct sadb_x_ipsecrequest *rq2;
2525         int mode;
2526
2527         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2528             len < rq1->sadb_x_ipsecrequest_len)
2529                 return -EINVAL;
2530
2531         /* old endoints */
2532         err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
2533                                   &m->old_family);
2534         if (err)
2535                 return err;
2536
2537         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2538         len -= rq1->sadb_x_ipsecrequest_len;
2539
2540         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2541             len < rq2->sadb_x_ipsecrequest_len)
2542                 return -EINVAL;
2543
2544         /* new endpoints */
2545         err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
2546                                   &m->new_family);
2547         if (err)
2548                 return err;
2549
2550         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2551             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2552             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2553                 return -EINVAL;
2554
2555         m->proto = rq1->sadb_x_ipsecrequest_proto;
2556         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2557                 return -EINVAL;
2558         m->mode = mode;
2559         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2560
2561         return ((int)(rq1->sadb_x_ipsecrequest_len +
2562                       rq2->sadb_x_ipsecrequest_len));
2563 }
2564
2565 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2566                          struct sadb_msg *hdr, void **ext_hdrs)
2567 {
2568         int i, len, ret, err = -EINVAL;
2569         u8 dir;
2570         struct sadb_address *sa;
2571         struct sadb_x_policy *pol;
2572         struct sadb_x_ipsecrequest *rq;
2573         struct xfrm_selector sel;
2574         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2575
2576         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2577             ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2578             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2579                 err = -EINVAL;
2580                 goto out;
2581         }
2582
2583         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2584         if (!pol) {
2585                 err = -EINVAL;
2586                 goto out;
2587         }
2588
2589         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2590                 err = -EINVAL;
2591                 goto out;
2592         }
2593
2594         dir = pol->sadb_x_policy_dir - 1;
2595         memset(&sel, 0, sizeof(sel));
2596
2597         /* set source address info of selector */
2598         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2599         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2600         sel.prefixlen_s = sa->sadb_address_prefixlen;
2601         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2602         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2603         if (sel.sport)
2604                 sel.sport_mask = htons(0xffff);
2605
2606         /* set destination address info of selector */
2607         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2608         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2609         sel.prefixlen_d = sa->sadb_address_prefixlen;
2610         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2611         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2612         if (sel.dport)
2613                 sel.dport_mask = htons(0xffff);
2614
2615         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2616
2617         /* extract ipsecrequests */
2618         i = 0;
2619         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2620
2621         while (len > 0 && i < XFRM_MAX_DEPTH) {
2622                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2623                 if (ret < 0) {
2624                         err = ret;
2625                         goto out;
2626                 } else {
2627                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2628                         len -= ret;
2629                         i++;
2630                 }
2631         }
2632
2633         if (!i || len > 0) {
2634                 err = -EINVAL;
2635                 goto out;
2636         }
2637
2638         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
2639
2640  out:
2641         return err;
2642 }
2643 #else
2644 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2645                          struct sadb_msg *hdr, void **ext_hdrs)
2646 {
2647         return -ENOPROTOOPT;
2648 }
2649 #endif
2650
2651
2652 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2653 {
2654         unsigned int dir;
2655         int err = 0, delete;
2656         struct sadb_x_policy *pol;
2657         struct xfrm_policy *xp;
2658         struct km_event c;
2659
2660         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2661                 return -EINVAL;
2662
2663         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2664         if (dir >= XFRM_POLICY_MAX)
2665                 return -EINVAL;
2666
2667         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2668         xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2669                               delete, &err);
2670         if (xp == NULL)
2671                 return -ENOENT;
2672
2673         if (delete) {
2674                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2675                                 audit_get_loginuid(current),
2676                                 audit_get_sessionid(current), 0);
2677
2678                 if (err)
2679                         goto out;
2680                 c.seq = hdr->sadb_msg_seq;
2681                 c.pid = hdr->sadb_msg_pid;
2682                 c.data.byid = 1;
2683                 c.event = XFRM_MSG_DELPOLICY;
2684                 km_policy_notify(xp, dir, &c);
2685         } else {
2686                 err = key_pol_get_resp(sk, xp, hdr, dir);
2687         }
2688
2689 out:
2690         xfrm_pol_put(xp);
2691         return err;
2692 }
2693
2694 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2695 {
2696         struct pfkey_sock *pfk = ptr;
2697         struct sk_buff *out_skb;
2698         struct sadb_msg *out_hdr;
2699         int err;
2700
2701         if (!pfkey_can_dump(&pfk->sk))
2702                 return -ENOBUFS;
2703
2704         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2705         if (IS_ERR(out_skb))
2706                 return PTR_ERR(out_skb);
2707
2708         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2709         if (err < 0)
2710                 return err;
2711
2712         out_hdr = (struct sadb_msg *) out_skb->data;
2713         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2714         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2715         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2716         out_hdr->sadb_msg_errno = 0;
2717         out_hdr->sadb_msg_seq = count;
2718         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2719         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
2720         return 0;
2721 }
2722
2723 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2724 {
2725         return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
2726 }
2727
2728 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2729 {
2730         xfrm_policy_walk_done(&pfk->dump.u.policy);
2731 }
2732
2733 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2734 {
2735         struct pfkey_sock *pfk = pfkey_sk(sk);
2736
2737         if (pfk->dump.dump != NULL)
2738                 return -EBUSY;
2739
2740         pfk->dump.msg_version = hdr->sadb_msg_version;
2741         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2742         pfk->dump.dump = pfkey_dump_sp;
2743         pfk->dump.done = pfkey_dump_sp_done;
2744         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2745
2746         return pfkey_do_dump(pfk);
2747 }
2748
2749 static int key_notify_policy_flush(struct km_event *c)
2750 {
2751         struct sk_buff *skb_out;
2752         struct sadb_msg *hdr;
2753
2754         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2755         if (!skb_out)
2756                 return -ENOBUFS;
2757         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2758         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2759         hdr->sadb_msg_seq = c->seq;
2760         hdr->sadb_msg_pid = c->pid;
2761         hdr->sadb_msg_version = PF_KEY_V2;
2762         hdr->sadb_msg_errno = (uint8_t) 0;
2763         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2764         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2765         return 0;
2766
2767 }
2768
2769 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2770 {
2771         struct km_event c;
2772         struct xfrm_audit audit_info;
2773         int err;
2774
2775         audit_info.loginuid = audit_get_loginuid(current);
2776         audit_info.sessionid = audit_get_sessionid(current);
2777         audit_info.secid = 0;
2778         err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
2779         if (err)
2780                 return err;
2781         c.data.type = XFRM_POLICY_TYPE_MAIN;
2782         c.event = XFRM_MSG_FLUSHPOLICY;
2783         c.pid = hdr->sadb_msg_pid;
2784         c.seq = hdr->sadb_msg_seq;
2785         km_policy_notify(NULL, 0, &c);
2786
2787         return 0;
2788 }
2789
2790 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2791                              struct sadb_msg *hdr, void **ext_hdrs);
2792 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2793         [SADB_RESERVED]         = pfkey_reserved,
2794         [SADB_GETSPI]           = pfkey_getspi,
2795         [SADB_UPDATE]           = pfkey_add,
2796         [SADB_ADD]              = pfkey_add,
2797         [SADB_DELETE]           = pfkey_delete,
2798         [SADB_GET]              = pfkey_get,
2799         [SADB_ACQUIRE]          = pfkey_acquire,
2800         [SADB_REGISTER]         = pfkey_register,
2801         [SADB_EXPIRE]           = NULL,
2802         [SADB_FLUSH]            = pfkey_flush,
2803         [SADB_DUMP]             = pfkey_dump,
2804         [SADB_X_PROMISC]        = pfkey_promisc,
2805         [SADB_X_PCHANGE]        = NULL,
2806         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2807         [SADB_X_SPDADD]         = pfkey_spdadd,
2808         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2809         [SADB_X_SPDGET]         = pfkey_spdget,
2810         [SADB_X_SPDACQUIRE]     = NULL,
2811         [SADB_X_SPDDUMP]        = pfkey_spddump,
2812         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2813         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2814         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2815         [SADB_X_MIGRATE]        = pfkey_migrate,
2816 };
2817
2818 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2819 {
2820         void *ext_hdrs[SADB_EXT_MAX];
2821         int err;
2822
2823         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2824                         BROADCAST_PROMISC_ONLY, NULL);
2825
2826         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2827         err = parse_exthdrs(skb, hdr, ext_hdrs);
2828         if (!err) {
2829                 err = -EOPNOTSUPP;
2830                 if (pfkey_funcs[hdr->sadb_msg_type])
2831                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2832         }
2833         return err;
2834 }
2835
2836 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2837 {
2838         struct sadb_msg *hdr = NULL;
2839
2840         if (skb->len < sizeof(*hdr)) {
2841                 *errp = -EMSGSIZE;
2842         } else {
2843                 hdr = (struct sadb_msg *) skb->data;
2844                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2845                     hdr->sadb_msg_reserved != 0 ||
2846                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2847                      hdr->sadb_msg_type > SADB_MAX)) {
2848                         hdr = NULL;
2849                         *errp = -EINVAL;
2850                 } else if (hdr->sadb_msg_len != (skb->len /
2851                                                  sizeof(uint64_t)) ||
2852                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2853                                                 sizeof(uint64_t))) {
2854                         hdr = NULL;
2855                         *errp = -EMSGSIZE;
2856                 } else {
2857                         *errp = 0;
2858                 }
2859         }
2860         return hdr;
2861 }
2862
2863 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2864 {
2865         unsigned int id = d->desc.sadb_alg_id;
2866
2867         if (id >= sizeof(t->aalgos) * 8)
2868                 return 0;
2869
2870         return (t->aalgos >> id) & 1;
2871 }
2872
2873 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2874 {
2875         unsigned int id = d->desc.sadb_alg_id;
2876
2877         if (id >= sizeof(t->ealgos) * 8)
2878                 return 0;
2879
2880         return (t->ealgos >> id) & 1;
2881 }
2882
2883 static int count_ah_combs(struct xfrm_tmpl *t)
2884 {
2885         int i, sz = 0;
2886
2887         for (i = 0; ; i++) {
2888                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2889                 if (!aalg)
2890                         break;
2891                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2892                         sz += sizeof(struct sadb_comb);
2893         }
2894         return sz + sizeof(struct sadb_prop);
2895 }
2896
2897 static int count_esp_combs(struct xfrm_tmpl *t)
2898 {
2899         int i, k, sz = 0;
2900
2901         for (i = 0; ; i++) {
2902                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2903                 if (!ealg)
2904                         break;
2905
2906                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2907                         continue;
2908
2909                 for (k = 1; ; k++) {
2910                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2911                         if (!aalg)
2912                                 break;
2913
2914                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2915                                 sz += sizeof(struct sadb_comb);
2916                 }
2917         }
2918         return sz + sizeof(struct sadb_prop);
2919 }
2920
2921 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2922 {
2923         struct sadb_prop *p;
2924         int i;
2925
2926         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2927         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2928         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2929         p->sadb_prop_replay = 32;
2930         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2931
2932         for (i = 0; ; i++) {
2933                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2934                 if (!aalg)
2935                         break;
2936
2937                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2938                         struct sadb_comb *c;
2939                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2940                         memset(c, 0, sizeof(*c));
2941                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2942                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2943                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2944                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2945                         c->sadb_comb_hard_addtime = 24*60*60;
2946                         c->sadb_comb_soft_addtime = 20*60*60;
2947                         c->sadb_comb_hard_usetime = 8*60*60;
2948                         c->sadb_comb_soft_usetime = 7*60*60;
2949                 }
2950         }
2951 }
2952
2953 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2954 {
2955         struct sadb_prop *p;
2956         int i, k;
2957
2958         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2959         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2960         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2961         p->sadb_prop_replay = 32;
2962         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2963
2964         for (i=0; ; i++) {
2965                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2966                 if (!ealg)
2967                         break;
2968
2969                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2970                         continue;
2971
2972                 for (k = 1; ; k++) {
2973                         struct sadb_comb *c;
2974                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2975                         if (!aalg)
2976                                 break;
2977                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2978                                 continue;
2979                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2980                         memset(c, 0, sizeof(*c));
2981                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2982                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2983                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2984                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2985                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2986                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2987                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2988                         c->sadb_comb_hard_addtime = 24*60*60;
2989                         c->sadb_comb_soft_addtime = 20*60*60;
2990                         c->sadb_comb_hard_usetime = 8*60*60;
2991                         c->sadb_comb_soft_usetime = 7*60*60;
2992                 }
2993         }
2994 }
2995
2996 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2997 {
2998         return 0;
2999 }
3000
3001 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
3002 {
3003         struct sk_buff *out_skb;
3004         struct sadb_msg *out_hdr;
3005         int hard;
3006         int hsc;
3007
3008         hard = c->data.hard;
3009         if (hard)
3010                 hsc = 2;
3011         else
3012                 hsc = 1;
3013
3014         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
3015         if (IS_ERR(out_skb))
3016                 return PTR_ERR(out_skb);
3017
3018         out_hdr = (struct sadb_msg *) out_skb->data;
3019         out_hdr->sadb_msg_version = PF_KEY_V2;
3020         out_hdr->sadb_msg_type = SADB_EXPIRE;
3021         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3022         out_hdr->sadb_msg_errno = 0;
3023         out_hdr->sadb_msg_reserved = 0;
3024         out_hdr->sadb_msg_seq = 0;
3025         out_hdr->sadb_msg_pid = 0;
3026
3027         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3028         return 0;
3029 }
3030
3031 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
3032 {
3033         if (atomic_read(&pfkey_socks_nr) == 0)
3034                 return 0;
3035
3036         switch (c->event) {
3037         case XFRM_MSG_EXPIRE:
3038                 return key_notify_sa_expire(x, c);
3039         case XFRM_MSG_DELSA:
3040         case XFRM_MSG_NEWSA:
3041         case XFRM_MSG_UPDSA:
3042                 return key_notify_sa(x, c);
3043         case XFRM_MSG_FLUSHSA:
3044                 return key_notify_sa_flush(c);
3045         case XFRM_MSG_NEWAE: /* not yet supported */
3046                 break;
3047         default:
3048                 printk("pfkey: Unknown SA event %d\n", c->event);
3049                 break;
3050         }
3051
3052         return 0;
3053 }
3054
3055 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
3056 {
3057         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
3058                 return 0;
3059
3060         switch (c->event) {
3061         case XFRM_MSG_POLEXPIRE:
3062                 return key_notify_policy_expire(xp, c);
3063         case XFRM_MSG_DELPOLICY:
3064         case XFRM_MSG_NEWPOLICY:
3065         case XFRM_MSG_UPDPOLICY:
3066                 return key_notify_policy(xp, dir, c);
3067         case XFRM_MSG_FLUSHPOLICY:
3068                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3069                         break;
3070                 return key_notify_policy_flush(c);
3071         default:
3072                 printk("pfkey: Unknown policy event %d\n", c->event);
3073                 break;
3074         }
3075
3076         return 0;
3077 }
3078
3079 static u32 get_acqseq(void)
3080 {
3081         u32 res;
3082         static u32 acqseq;
3083         static DEFINE_SPINLOCK(acqseq_lock);
3084
3085         spin_lock_bh(&acqseq_lock);
3086         res = (++acqseq ? : ++acqseq);
3087         spin_unlock_bh(&acqseq_lock);
3088         return res;
3089 }
3090
3091 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3092 {
3093         struct sk_buff *skb;
3094         struct sadb_msg *hdr;
3095         struct sadb_address *addr;
3096         struct sadb_x_policy *pol;
3097         struct sockaddr_in *sin;
3098 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3099         struct sockaddr_in6 *sin6;
3100 #endif
3101         int sockaddr_size;
3102         int size;
3103         struct sadb_x_sec_ctx *sec_ctx;
3104         struct xfrm_sec_ctx *xfrm_ctx;
3105         int ctx_size = 0;
3106
3107         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3108         if (!sockaddr_size)
3109                 return -EINVAL;
3110
3111         size = sizeof(struct sadb_msg) +
3112                 (sizeof(struct sadb_address) * 2) +
3113                 (sockaddr_size * 2) +
3114                 sizeof(struct sadb_x_policy);
3115
3116         if (x->id.proto == IPPROTO_AH)
3117                 size += count_ah_combs(t);
3118         else if (x->id.proto == IPPROTO_ESP)
3119                 size += count_esp_combs(t);
3120
3121         if ((xfrm_ctx = x->security)) {
3122                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3123                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3124         }
3125
3126         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3127         if (skb == NULL)
3128                 return -ENOMEM;
3129
3130         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3131         hdr->sadb_msg_version = PF_KEY_V2;
3132         hdr->sadb_msg_type = SADB_ACQUIRE;
3133         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3134         hdr->sadb_msg_len = size / sizeof(uint64_t);
3135         hdr->sadb_msg_errno = 0;
3136         hdr->sadb_msg_reserved = 0;
3137         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3138         hdr->sadb_msg_pid = 0;
3139
3140         /* src address */
3141         addr = (struct sadb_address*) skb_put(skb,
3142                                               sizeof(struct sadb_address)+sockaddr_size);
3143         addr->sadb_address_len =
3144                 (sizeof(struct sadb_address)+sockaddr_size)/
3145                         sizeof(uint64_t);
3146         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3147         addr->sadb_address_proto = 0;
3148         addr->sadb_address_reserved = 0;
3149         if (x->props.family == AF_INET) {
3150                 addr->sadb_address_prefixlen = 32;
3151
3152                 sin = (struct sockaddr_in *) (addr + 1);
3153                 sin->sin_family = AF_INET;
3154                 sin->sin_addr.s_addr = x->props.saddr.a4;
3155                 sin->sin_port = 0;
3156                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3157         }
3158 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3159         else if (x->props.family == AF_INET6) {
3160                 addr->sadb_address_prefixlen = 128;
3161
3162                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3163                 sin6->sin6_family = AF_INET6;
3164                 sin6->sin6_port = 0;
3165                 sin6->sin6_flowinfo = 0;
3166                 memcpy(&sin6->sin6_addr,
3167                        x->props.saddr.a6, sizeof(struct in6_addr));
3168                 sin6->sin6_scope_id = 0;
3169         }
3170 #endif
3171         else
3172                 BUG();
3173
3174         /* dst address */
3175         addr = (struct sadb_address*) skb_put(skb,
3176                                               sizeof(struct sadb_address)+sockaddr_size);
3177         addr->sadb_address_len =
3178                 (sizeof(struct sadb_address)+sockaddr_size)/
3179                         sizeof(uint64_t);
3180         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3181         addr->sadb_address_proto = 0;
3182         addr->sadb_address_reserved = 0;
3183         if (x->props.family == AF_INET) {
3184                 addr->sadb_address_prefixlen = 32;
3185
3186                 sin = (struct sockaddr_in *) (addr + 1);
3187                 sin->sin_family = AF_INET;
3188                 sin->sin_addr.s_addr = x->id.daddr.a4;
3189                 sin->sin_port = 0;
3190                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3191         }
3192 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3193         else if (x->props.family == AF_INET6) {
3194                 addr->sadb_address_prefixlen = 128;
3195
3196                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3197                 sin6->sin6_family = AF_INET6;
3198                 sin6->sin6_port = 0;
3199                 sin6->sin6_flowinfo = 0;
3200                 memcpy(&sin6->sin6_addr,
3201                        x->id.daddr.a6, sizeof(struct in6_addr));
3202                 sin6->sin6_scope_id = 0;
3203         }
3204 #endif
3205         else
3206                 BUG();
3207
3208         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3209         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3210         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3211         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3212         pol->sadb_x_policy_dir = dir+1;
3213         pol->sadb_x_policy_id = xp->index;
3214
3215         /* Set sadb_comb's. */
3216         if (x->id.proto == IPPROTO_AH)
3217                 dump_ah_combs(skb, t);
3218         else if (x->id.proto == IPPROTO_ESP)
3219                 dump_esp_combs(skb, t);
3220
3221         /* security context */
3222         if (xfrm_ctx) {
3223                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3224                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3225                 sec_ctx->sadb_x_sec_len =
3226                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3227                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3228                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3229                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3230                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3231                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3232                        xfrm_ctx->ctx_len);
3233         }
3234
3235         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3236 }
3237
3238 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3239                                                 u8 *data, int len, int *dir)
3240 {
3241         struct xfrm_policy *xp;
3242         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3243         struct sadb_x_sec_ctx *sec_ctx;
3244
3245         switch (sk->sk_family) {
3246         case AF_INET:
3247                 if (opt != IP_IPSEC_POLICY) {
3248                         *dir = -EOPNOTSUPP;
3249                         return NULL;
3250                 }
3251                 break;
3252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3253         case AF_INET6:
3254                 if (opt != IPV6_IPSEC_POLICY) {
3255                         *dir = -EOPNOTSUPP;
3256                         return NULL;
3257                 }
3258                 break;
3259 #endif
3260         default:
3261                 *dir = -EINVAL;
3262                 return NULL;
3263         }
3264
3265         *dir = -EINVAL;
3266
3267         if (len < sizeof(struct sadb_x_policy) ||
3268             pol->sadb_x_policy_len*8 > len ||
3269             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3270             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3271                 return NULL;
3272
3273         xp = xfrm_policy_alloc(GFP_ATOMIC);
3274         if (xp == NULL) {
3275                 *dir = -ENOBUFS;
3276                 return NULL;
3277         }
3278
3279         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3280                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3281
3282         xp->lft.soft_byte_limit = XFRM_INF;
3283         xp->lft.hard_byte_limit = XFRM_INF;
3284         xp->lft.soft_packet_limit = XFRM_INF;
3285         xp->lft.hard_packet_limit = XFRM_INF;
3286         xp->family = sk->sk_family;
3287
3288         xp->xfrm_nr = 0;
3289         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3290             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3291                 goto out;
3292
3293         /* security context too */
3294         if (len >= (pol->sadb_x_policy_len*8 +
3295             sizeof(struct sadb_x_sec_ctx))) {
3296                 char *p = (char *)pol;
3297                 struct xfrm_user_sec_ctx *uctx;
3298
3299                 p += pol->sadb_x_policy_len*8;
3300                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3301                 if (len < pol->sadb_x_policy_len*8 +
3302                     sec_ctx->sadb_x_sec_len) {
3303                         *dir = -EINVAL;
3304                         goto out;
3305                 }
3306                 if ((*dir = verify_sec_ctx_len(p)))
3307                         goto out;
3308                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3309                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3310                 kfree(uctx);
3311
3312                 if (*dir)
3313                         goto out;
3314         }
3315
3316         *dir = pol->sadb_x_policy_dir-1;
3317         return xp;
3318
3319 out:
3320         xfrm_policy_destroy(xp);
3321         return NULL;
3322 }
3323
3324 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3325 {
3326         struct sk_buff *skb;
3327         struct sadb_msg *hdr;
3328         struct sadb_sa *sa;
3329         struct sadb_address *addr;
3330         struct sadb_x_nat_t_port *n_port;
3331         struct sockaddr_in *sin;
3332 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3333         struct sockaddr_in6 *sin6;
3334 #endif
3335         int sockaddr_size;
3336         int size;
3337         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3338         struct xfrm_encap_tmpl *natt = NULL;
3339
3340         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3341         if (!sockaddr_size)
3342                 return -EINVAL;
3343
3344         if (!satype)
3345                 return -EINVAL;
3346
3347         if (!x->encap)
3348                 return -EINVAL;
3349
3350         natt = x->encap;
3351
3352         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3353          *
3354          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3355          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3356          */
3357
3358         size = sizeof(struct sadb_msg) +
3359                 sizeof(struct sadb_sa) +
3360                 (sizeof(struct sadb_address) * 2) +
3361                 (sockaddr_size * 2) +
3362                 (sizeof(struct sadb_x_nat_t_port) * 2);
3363
3364         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3365         if (skb == NULL)
3366                 return -ENOMEM;
3367
3368         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3369         hdr->sadb_msg_version = PF_KEY_V2;
3370         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3371         hdr->sadb_msg_satype = satype;
3372         hdr->sadb_msg_len = size / sizeof(uint64_t);
3373         hdr->sadb_msg_errno = 0;
3374         hdr->sadb_msg_reserved = 0;
3375         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3376         hdr->sadb_msg_pid = 0;
3377
3378         /* SA */
3379         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3380         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3381         sa->sadb_sa_exttype = SADB_EXT_SA;
3382         sa->sadb_sa_spi = x->id.spi;
3383         sa->sadb_sa_replay = 0;
3384         sa->sadb_sa_state = 0;
3385         sa->sadb_sa_auth = 0;
3386         sa->sadb_sa_encrypt = 0;
3387         sa->sadb_sa_flags = 0;
3388
3389         /* ADDRESS_SRC (old addr) */
3390         addr = (struct sadb_address*)
3391                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3392         addr->sadb_address_len =
3393                 (sizeof(struct sadb_address)+sockaddr_size)/
3394                         sizeof(uint64_t);
3395         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3396         addr->sadb_address_proto = 0;
3397         addr->sadb_address_reserved = 0;
3398         if (x->props.family == AF_INET) {
3399                 addr->sadb_address_prefixlen = 32;
3400
3401                 sin = (struct sockaddr_in *) (addr + 1);
3402                 sin->sin_family = AF_INET;
3403                 sin->sin_addr.s_addr = x->props.saddr.a4;
3404                 sin->sin_port = 0;
3405                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3406         }
3407 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3408         else if (x->props.family == AF_INET6) {
3409                 addr->sadb_address_prefixlen = 128;
3410
3411                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3412                 sin6->sin6_family = AF_INET6;
3413                 sin6->sin6_port = 0;
3414                 sin6->sin6_flowinfo = 0;
3415                 memcpy(&sin6->sin6_addr,
3416                        x->props.saddr.a6, sizeof(struct in6_addr));
3417                 sin6->sin6_scope_id = 0;
3418         }
3419 #endif
3420         else
3421                 BUG();
3422
3423         /* NAT_T_SPORT (old port) */
3424         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3425         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3426         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3427         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3428         n_port->sadb_x_nat_t_port_reserved = 0;
3429
3430         /* ADDRESS_DST (new addr) */
3431         addr = (struct sadb_address*)
3432                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3433         addr->sadb_address_len =
3434                 (sizeof(struct sadb_address)+sockaddr_size)/
3435                         sizeof(uint64_t);
3436         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3437         addr->sadb_address_proto = 0;
3438         addr->sadb_address_reserved = 0;
3439         if (x->props.family == AF_INET) {
3440                 addr->sadb_address_prefixlen = 32;
3441
3442                 sin = (struct sockaddr_in *) (addr + 1);
3443                 sin->sin_family = AF_INET;
3444                 sin->sin_addr.s_addr = ipaddr->a4;
3445                 sin->sin_port = 0;
3446                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3447         }
3448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3449         else if (x->props.family == AF_INET6) {
3450                 addr->sadb_address_prefixlen = 128;
3451
3452                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3453                 sin6->sin6_family = AF_INET6;
3454                 sin6->sin6_port = 0;
3455                 sin6->sin6_flowinfo = 0;
3456                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
3457                 sin6->sin6_scope_id = 0;
3458         }
3459 #endif
3460         else
3461                 BUG();
3462
3463         /* NAT_T_DPORT (new port) */
3464         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3465         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3466         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3467         n_port->sadb_x_nat_t_port_port = sport;
3468         n_port->sadb_x_nat_t_port_reserved = 0;
3469
3470         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3471 }
3472
3473 #ifdef CONFIG_NET_KEY_MIGRATE
3474 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3475                             struct xfrm_selector *sel)
3476 {
3477         struct sadb_address *addr;
3478         struct sockaddr_in *sin;
3479 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3480         struct sockaddr_in6 *sin6;
3481 #endif
3482         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3483         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3484         addr->sadb_address_exttype = type;
3485         addr->sadb_address_proto = sel->proto;
3486         addr->sadb_address_reserved = 0;
3487
3488         switch (type) {
3489         case SADB_EXT_ADDRESS_SRC:
3490                 if (sel->family == AF_INET) {
3491                         addr->sadb_address_prefixlen = sel->prefixlen_s;
3492                         sin = (struct sockaddr_in *)(addr + 1);
3493                         sin->sin_family = AF_INET;
3494                         memcpy(&sin->sin_addr.s_addr, &sel->saddr,
3495                                sizeof(sin->sin_addr.s_addr));
3496                         sin->sin_port = 0;
3497                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3498                 }
3499 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3500                 else if (sel->family == AF_INET6) {
3501                         addr->sadb_address_prefixlen = sel->prefixlen_s;
3502                         sin6 = (struct sockaddr_in6 *)(addr + 1);
3503                         sin6->sin6_family = AF_INET6;
3504                         sin6->sin6_port = 0;
3505                         sin6->sin6_flowinfo = 0;
3506                         sin6->sin6_scope_id = 0;
3507                         memcpy(&sin6->sin6_addr.s6_addr, &sel->saddr,
3508                                sizeof(sin6->sin6_addr.s6_addr));
3509                 }
3510 #endif
3511                 break;
3512         case SADB_EXT_ADDRESS_DST:
3513                 if (sel->family == AF_INET) {
3514                         addr->sadb_address_prefixlen = sel->prefixlen_d;
3515                         sin = (struct sockaddr_in *)(addr + 1);
3516                         sin->sin_family = AF_INET;
3517                         memcpy(&sin->sin_addr.s_addr, &sel->daddr,
3518                                sizeof(sin->sin_addr.s_addr));
3519                         sin->sin_port = 0;
3520                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3521                 }
3522 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3523                 else if (sel->family == AF_INET6) {
3524                         addr->sadb_address_prefixlen = sel->prefixlen_d;
3525                         sin6 = (struct sockaddr_in6 *)(addr + 1);
3526                         sin6->sin6_family = AF_INET6;
3527                         sin6->sin6_port = 0;
3528                         sin6->sin6_flowinfo = 0;
3529                         sin6->sin6_scope_id = 0;
3530                         memcpy(&sin6->sin6_addr.s6_addr, &sel->daddr,
3531                                sizeof(sin6->sin6_addr.s6_addr));
3532                 }
3533 #endif
3534                 break;
3535         default:
3536                 return -EINVAL;
3537         }
3538
3539         return 0;
3540 }
3541
3542 static int set_ipsecrequest(struct sk_buff *skb,
3543                             uint8_t proto, uint8_t mode, int level,
3544                             uint32_t reqid, uint8_t family,
3545                             xfrm_address_t *src, xfrm_address_t *dst)
3546 {
3547         struct sadb_x_ipsecrequest *rq;
3548         struct sockaddr_in *sin;
3549 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3550         struct sockaddr_in6 *sin6;
3551 #endif
3552         int size_req;
3553
3554         size_req = sizeof(struct sadb_x_ipsecrequest) +
3555                    pfkey_sockaddr_pair_size(family);
3556
3557         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3558         memset(rq, 0, size_req);
3559         rq->sadb_x_ipsecrequest_len = size_req;
3560         rq->sadb_x_ipsecrequest_proto = proto;
3561         rq->sadb_x_ipsecrequest_mode = mode;
3562         rq->sadb_x_ipsecrequest_level = level;
3563         rq->sadb_x_ipsecrequest_reqid = reqid;
3564
3565         switch (family) {
3566         case AF_INET:
3567                 sin = (struct sockaddr_in *)(rq + 1);
3568                 sin->sin_family = AF_INET;
3569                 memcpy(&sin->sin_addr.s_addr, src,
3570                        sizeof(sin->sin_addr.s_addr));
3571                 sin++;
3572                 sin->sin_family = AF_INET;
3573                 memcpy(&sin->sin_addr.s_addr, dst,
3574                        sizeof(sin->sin_addr.s_addr));
3575                 break;
3576 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3577         case AF_INET6:
3578                 sin6 = (struct sockaddr_in6 *)(rq + 1);
3579                 sin6->sin6_family = AF_INET6;
3580                 sin6->sin6_port = 0;
3581                 sin6->sin6_flowinfo = 0;
3582                 sin6->sin6_scope_id = 0;
3583                 memcpy(&sin6->sin6_addr.s6_addr, src,
3584                        sizeof(sin6->sin6_addr.s6_addr));
3585                 sin6++;
3586                 sin6->sin6_family = AF_INET6;
3587                 sin6->sin6_port = 0;
3588                 sin6->sin6_flowinfo = 0;
3589                 sin6->sin6_scope_id = 0;
3590                 memcpy(&sin6->sin6_addr.s6_addr, dst,
3591                        sizeof(sin6->sin6_addr.s6_addr));
3592                 break;
3593 #endif
3594         default:
3595                 return -EINVAL;
3596         }
3597
3598         return 0;
3599 }
3600 #endif
3601
3602 #ifdef CONFIG_NET_KEY_MIGRATE
3603 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3604                               struct xfrm_migrate *m, int num_bundles)
3605 {
3606         int i;
3607         int sasize_sel;
3608         int size = 0;
3609         int size_pol = 0;
3610         struct sk_buff *skb;
3611         struct sadb_msg *hdr;
3612         struct sadb_x_policy *pol;
3613         struct xfrm_migrate *mp;
3614
3615         if (type != XFRM_POLICY_TYPE_MAIN)
3616                 return 0;
3617
3618         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3619                 return -EINVAL;
3620
3621         /* selector */
3622         sasize_sel = pfkey_sockaddr_size(sel->family);
3623         if (!sasize_sel)
3624                 return -EINVAL;
3625         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3626
3627         /* policy info */
3628         size_pol += sizeof(struct sadb_x_policy);
3629
3630         /* ipsecrequests */
3631         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3632                 /* old locator pair */
3633                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3634                             pfkey_sockaddr_pair_size(mp->old_family);
3635                 /* new locator pair */
3636                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3637                             pfkey_sockaddr_pair_size(mp->new_family);
3638         }
3639
3640         size += sizeof(struct sadb_msg) + size_pol;
3641
3642         /* alloc buffer */
3643         skb = alloc_skb(size, GFP_ATOMIC);
3644         if (skb == NULL)
3645                 return -ENOMEM;
3646
3647         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3648         hdr->sadb_msg_version = PF_KEY_V2;
3649         hdr->sadb_msg_type = SADB_X_MIGRATE;
3650         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3651         hdr->sadb_msg_len = size / 8;
3652         hdr->sadb_msg_errno = 0;
3653         hdr->sadb_msg_reserved = 0;
3654         hdr->sadb_msg_seq = 0;
3655         hdr->sadb_msg_pid = 0;
3656
3657         /* selector src */
3658         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3659
3660         /* selector dst */
3661         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3662
3663         /* policy information */
3664         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3665         pol->sadb_x_policy_len = size_pol / 8;
3666         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3667         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3668         pol->sadb_x_policy_dir = dir + 1;
3669         pol->sadb_x_policy_id = 0;
3670         pol->sadb_x_policy_priority = 0;
3671
3672         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3673                 /* old ipsecrequest */
3674                 int mode = pfkey_mode_from_xfrm(mp->mode);
3675                 if (mode < 0)
3676                         goto err;
3677                 if (set_ipsecrequest(skb, mp->proto, mode,
3678                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3679                                      mp->reqid, mp->old_family,
3680                                      &mp->old_saddr, &mp->old_daddr) < 0)
3681                         goto err;
3682
3683                 /* new ipsecrequest */
3684                 if (set_ipsecrequest(skb, mp->proto, mode,
3685                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3686                                      mp->reqid, mp->new_family,
3687                                      &mp->new_saddr, &mp->new_daddr) < 0)
3688                         goto err;
3689         }
3690
3691         /* broadcast migrate message to sockets */
3692         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3693
3694         return 0;
3695
3696 err:
3697         kfree_skb(skb);
3698         return -EINVAL;
3699 }
3700 #else
3701 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3702                               struct xfrm_migrate *m, int num_bundles)
3703 {
3704         return -ENOPROTOOPT;
3705 }
3706 #endif
3707
3708 static int pfkey_sendmsg(struct kiocb *kiocb,
3709                          struct socket *sock, struct msghdr *msg, size_t len)
3710 {
3711         struct sock *sk = sock->sk;
3712         struct sk_buff *skb = NULL;
3713         struct sadb_msg *hdr = NULL;
3714         int err;
3715
3716         err = -EOPNOTSUPP;
3717         if (msg->msg_flags & MSG_OOB)
3718                 goto out;
3719
3720         err = -EMSGSIZE;
3721         if ((unsigned)len > sk->sk_sndbuf - 32)
3722                 goto out;
3723
3724         err = -ENOBUFS;
3725         skb = alloc_skb(len, GFP_KERNEL);
3726         if (skb == NULL)
3727                 goto out;
3728
3729         err = -EFAULT;
3730         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3731                 goto out;
3732
3733         hdr = pfkey_get_base_msg(skb, &err);
3734         if (!hdr)
3735                 goto out;
3736
3737         mutex_lock(&xfrm_cfg_mutex);
3738         err = pfkey_process(sk, skb, hdr);
3739         mutex_unlock(&xfrm_cfg_mutex);
3740
3741 out:
3742         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3743                 err = 0;
3744         if (skb)
3745                 kfree_skb(skb);
3746
3747         return err ? : len;
3748 }
3749
3750 static int pfkey_recvmsg(struct kiocb *kiocb,
3751                          struct socket *sock, struct msghdr *msg, size_t len,
3752                          int flags)
3753 {
3754         struct sock *sk = sock->sk;
3755         struct pfkey_sock *pfk = pfkey_sk(sk);
3756         struct sk_buff *skb;
3757         int copied, err;
3758
3759         err = -EINVAL;
3760         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3761                 goto out;
3762
3763         msg->msg_namelen = 0;
3764         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3765         if (skb == NULL)
3766                 goto out;
3767
3768         copied = skb->len;
3769         if (copied > len) {
3770                 msg->msg_flags |= MSG_TRUNC;
3771                 copied = len;
3772         }
3773
3774         skb_reset_transport_header(skb);
3775         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3776         if (err)
3777                 goto out_free;
3778
3779         sock_recv_timestamp(msg, sk, skb);
3780
3781         err = (flags & MSG_TRUNC) ? skb->len : copied;
3782
3783         if (pfk->dump.dump != NULL &&
3784             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3785                 pfkey_do_dump(pfk);
3786
3787 out_free:
3788         skb_free_datagram(sk, skb);
3789 out:
3790         return err;
3791 }
3792
3793 static const struct proto_ops pfkey_ops = {
3794         .family         =       PF_KEY,
3795         .owner          =       THIS_MODULE,
3796         /* Operations that make no sense on pfkey sockets. */
3797         .bind           =       sock_no_bind,
3798         .connect        =       sock_no_connect,
3799         .socketpair     =       sock_no_socketpair,
3800         .accept         =       sock_no_accept,
3801         .getname        =       sock_no_getname,
3802         .ioctl          =       sock_no_ioctl,
3803         .listen         =       sock_no_listen,
3804         .shutdown       =       sock_no_shutdown,
3805         .setsockopt     =       sock_no_setsockopt,
3806         .getsockopt     =       sock_no_getsockopt,
3807         .mmap           =       sock_no_mmap,
3808         .sendpage       =       sock_no_sendpage,
3809
3810         /* Now the operations that really occur. */
3811         .release        =       pfkey_release,
3812         .poll           =       datagram_poll,
3813         .sendmsg        =       pfkey_sendmsg,
3814         .recvmsg        =       pfkey_recvmsg,
3815 };
3816
3817 static struct net_proto_family pfkey_family_ops = {
3818         .family =       PF_KEY,
3819         .create =       pfkey_create,
3820         .owner  =       THIS_MODULE,
3821 };
3822
3823 #ifdef CONFIG_PROC_FS
3824 static int pfkey_seq_show(struct seq_file *f, void *v)
3825 {
3826         struct sock *s;
3827
3828         s = (struct sock *)v;
3829         if (v == SEQ_START_TOKEN)
3830                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3831         else
3832                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3833                                s,
3834                                atomic_read(&s->sk_refcnt),
3835                                atomic_read(&s->sk_rmem_alloc),
3836                                atomic_read(&s->sk_wmem_alloc),
3837                                sock_i_uid(s),
3838                                sock_i_ino(s)
3839                                );
3840         return 0;
3841 }
3842
3843 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3844 {
3845         struct sock *s;
3846         struct hlist_node *node;
3847         loff_t pos = *ppos;
3848
3849         read_lock(&pfkey_table_lock);
3850         if (pos == 0)
3851                 return SEQ_START_TOKEN;
3852
3853         sk_for_each(s, node, &pfkey_table)
3854                 if (pos-- == 1)
3855                         return s;
3856
3857         return NULL;
3858 }
3859
3860 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3861 {
3862         ++*ppos;
3863         return (v == SEQ_START_TOKEN) ?
3864                 sk_head(&pfkey_table) :
3865                         sk_next((struct sock *)v);
3866 }
3867
3868 static void pfkey_seq_stop(struct seq_file *f, void *v)
3869 {
3870         read_unlock(&pfkey_table_lock);
3871 }
3872
3873 static struct seq_operations pfkey_seq_ops = {
3874         .start  = pfkey_seq_start,
3875         .next   = pfkey_seq_next,
3876         .stop   = pfkey_seq_stop,
3877         .show   = pfkey_seq_show,
3878 };
3879
3880 static int pfkey_seq_open(struct inode *inode, struct file *file)
3881 {
3882         return seq_open(file, &pfkey_seq_ops);
3883 }
3884
3885 static struct file_operations pfkey_proc_ops = {
3886         .open    = pfkey_seq_open,
3887         .read    = seq_read,
3888         .llseek  = seq_lseek,
3889         .release = seq_release,
3890 };
3891
3892 static int pfkey_init_proc(void)
3893 {
3894         struct proc_dir_entry *e;
3895
3896         e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3897         if (e == NULL)
3898                 return -ENOMEM;
3899
3900         return 0;
3901 }
3902
3903 static void pfkey_exit_proc(void)
3904 {
3905         proc_net_remove(&init_net, "pfkey");
3906 }
3907 #else
3908 static inline int pfkey_init_proc(void)
3909 {
3910         return 0;
3911 }
3912
3913 static inline void pfkey_exit_proc(void)
3914 {
3915 }
3916 #endif
3917
3918 static struct xfrm_mgr pfkeyv2_mgr =
3919 {
3920         .id             = "pfkeyv2",
3921         .notify         = pfkey_send_notify,
3922         .acquire        = pfkey_send_acquire,
3923         .compile_policy = pfkey_compile_policy,
3924         .new_mapping    = pfkey_send_new_mapping,
3925         .notify_policy  = pfkey_send_policy_notify,
3926         .migrate        = pfkey_send_migrate,
3927 };
3928
3929 static void __exit ipsec_pfkey_exit(void)
3930 {
3931         xfrm_unregister_km(&pfkeyv2_mgr);
3932         pfkey_exit_proc();
3933         sock_unregister(PF_KEY);
3934         proto_unregister(&key_proto);
3935 }
3936
3937 static int __init ipsec_pfkey_init(void)
3938 {
3939         int err = proto_register(&key_proto, 0);
3940
3941         if (err != 0)
3942                 goto out;
3943
3944         err = sock_register(&pfkey_family_ops);
3945         if (err != 0)
3946                 goto out_unregister_key_proto;
3947         err = pfkey_init_proc();
3948         if (err != 0)
3949                 goto out_sock_unregister;
3950         err = xfrm_register_km(&pfkeyv2_mgr);
3951         if (err != 0)
3952                 goto out_remove_proc_entry;
3953 out:
3954         return err;
3955 out_remove_proc_entry:
3956         pfkey_exit_proc();
3957 out_sock_unregister:
3958         sock_unregister(PF_KEY);
3959 out_unregister_key_proto:
3960         proto_unregister(&key_proto);
3961         goto out;
3962 }
3963
3964 module_init(ipsec_pfkey_init);
3965 module_exit(ipsec_pfkey_exit);
3966 MODULE_LICENSE("GPL");
3967 MODULE_ALIAS_NETPROTO(PF_KEY);