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                 struct sk_buff  *skb;
  62         } dump;
  63 };
  64
  65 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  66 {
  67         return (struct pfkey_sock *)sk;
  68 }
  69
  70 static int pfkey_can_dump(struct sock *sk)
  71 {
  72         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  73                 return 1;
  74         return 0;
  75 }
  76
  77 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  78 {
  79         if (pfk->dump.dump) {
  80                 if (pfk->dump.skb) {
  81                         kfree_skb(pfk->dump.skb);
  82                         pfk->dump.skb = NULL;
  83                 }
  84                 pfk->dump.done(pfk);
  85                 pfk->dump.dump = NULL;
  86                 pfk->dump.done = NULL;
  87         }
  88 }
  89
  90 static void pfkey_sock_destruct(struct sock *sk)
  91 {
  92         pfkey_terminate_dump(pfkey_sk(sk));
  93         skb_queue_purge(&sk->sk_receive_queue);
  94
  95         if (!sock_flag(sk, SOCK_DEAD)) {
  96                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  97                 return;
  98         }
  99
 100         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 101         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 102
 103         atomic_dec(&pfkey_socks_nr);
 104 }
 105
 106 static void pfkey_table_grab(void)
 107 {
 108         write_lock_bh(&pfkey_table_lock);
 109
 110         if (atomic_read(&pfkey_table_users)) {
 111                 DECLARE_WAITQUEUE(wait, current);
 112
 113                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
 114                 for(;;) {
 115                         set_current_state(TASK_UNINTERRUPTIBLE);
 116                         if (atomic_read(&pfkey_table_users) == 0)
 117                                 break;
 118                         write_unlock_bh(&pfkey_table_lock);
 119                         schedule();
 120                         write_lock_bh(&pfkey_table_lock);
 121                 }
 122
 123                 __set_current_state(TASK_RUNNING);
 124                 remove_wait_queue(&pfkey_table_wait, &wait);
 125         }
 126 }
 127
 128 static __inline__ void pfkey_table_ungrab(void)
 129 {
 130         write_unlock_bh(&pfkey_table_lock);
 131         wake_up(&pfkey_table_wait);
 132 }
 133
 134 static __inline__ void pfkey_lock_table(void)
 135 {
 136         /* read_lock() synchronizes us to pfkey_table_grab */
 137
 138         read_lock(&pfkey_table_lock);
 139         atomic_inc(&pfkey_table_users);
 140         read_unlock(&pfkey_table_lock);
 141 }
 142
 143 static __inline__ void pfkey_unlock_table(void)
 144 {
 145         if (atomic_dec_and_test(&pfkey_table_users))
 146                 wake_up(&pfkey_table_wait);
 147 }
 148
 149
 150 static const struct proto_ops pfkey_ops;
 151
 152 static void pfkey_insert(struct sock *sk)
 153 {
 154         pfkey_table_grab();
 155         sk_add_node(sk, &pfkey_table);
 156         pfkey_table_ungrab();
 157 }
 158
 159 static void pfkey_remove(struct sock *sk)
 160 {
 161         pfkey_table_grab();
 162         sk_del_node_init(sk);
 163         pfkey_table_ungrab();
 164 }
 165
 166 static struct proto key_proto = {
 167         .name     = "KEY",
 168         .owner    = THIS_MODULE,
 169         .obj_size = sizeof(struct pfkey_sock),
 170 };
 171
 172 static int pfkey_create(struct net *net, struct socket *sock, int protocol)
 173 {
 174         struct sock *sk;
 175         int err;
 176
 177         if (net != &init_net)
 178                 return -EAFNOSUPPORT;
 179
 180         if (!capable(CAP_NET_ADMIN))
 181                 return -EPERM;
 182         if (sock->type != SOCK_RAW)
 183                 return -ESOCKTNOSUPPORT;
 184         if (protocol != PF_KEY_V2)
 185                 return -EPROTONOSUPPORT;
 186
 187         err = -ENOMEM;
 188         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 189         if (sk == NULL)
 190                 goto out;
 191
 192         sock->ops = &pfkey_ops;
 193         sock_init_data(sock, sk);
 194
 195         sk->sk_family = PF_KEY;
 196         sk->sk_destruct = pfkey_sock_destruct;
 197
 198         atomic_inc(&pfkey_socks_nr);
 199
 200         pfkey_insert(sk);
 201
 202         return 0;
 203 out:
 204         return err;
 205 }
 206
 207 static int pfkey_release(struct socket *sock)
 208 {
 209         struct sock *sk = sock->sk;
 210
 211         if (!sk)
 212                 return 0;
 213
 214         pfkey_remove(sk);
 215
 216         sock_orphan(sk);
 217         sock->sk = NULL;
 218         skb_queue_purge(&sk->sk_write_queue);
 219         sock_put(sk);
 220
 221         return 0;
 222 }
 223
 224 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 225                                gfp_t allocation, struct sock *sk)
 226 {
 227         int err = -ENOBUFS;
 228
 229         sock_hold(sk);
 230         if (*skb2 == NULL) {
 231                 if (atomic_read(&skb->users) != 1) {
 232                         *skb2 = skb_clone(skb, allocation);
 233                 } else {
 234                         *skb2 = skb;
 235                         atomic_inc(&skb->users);
 236                 }
 237         }
 238         if (*skb2 != NULL) {
 239                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 240                         skb_orphan(*skb2);
 241                         skb_set_owner_r(*skb2, sk);
 242                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 243                         sk->sk_data_ready(sk, (*skb2)->len);
 244                         *skb2 = NULL;
 245                         err = 0;
 246                 }
 247         }
 248         sock_put(sk);
 249         return err;
 250 }
 251
 252 /* Send SKB to all pfkey sockets matching selected criteria.  */
 253 #define BROADCAST_ALL           0
 254 #define BROADCAST_ONE           1
 255 #define BROADCAST_REGISTERED    2
 256 #define BROADCAST_PROMISC_ONLY  4
 257 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 258                            int broadcast_flags, struct sock *one_sk)
 259 {
 260         struct sock *sk;
 261         struct hlist_node *node;
 262         struct sk_buff *skb2 = NULL;
 263         int err = -ESRCH;
 264
 265         /* XXX Do we need something like netlink_overrun?  I think
 266          * XXX PF_KEY socket apps will not mind current behavior.
 267          */
 268         if (!skb)
 269                 return -ENOMEM;
 270
 271         pfkey_lock_table();
 272         sk_for_each(sk, node, &pfkey_table) {
 273                 struct pfkey_sock *pfk = pfkey_sk(sk);
 274                 int err2;
 275
 276                 /* Yes, it means that if you are meant to receive this
 277                  * pfkey message you receive it twice as promiscuous
 278                  * socket.
 279                  */
 280                 if (pfk->promisc)
 281                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 282
 283                 /* the exact target will be processed later */
 284                 if (sk == one_sk)
 285                         continue;
 286                 if (broadcast_flags != BROADCAST_ALL) {
 287                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 288                                 continue;
 289                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 290                             !pfk->registered)
 291                                 continue;
 292                         if (broadcast_flags & BROADCAST_ONE)
 293                                 continue;
 294                 }
 295
 296                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 297
 298                 /* Error is cleare after succecful sending to at least one
 299                  * registered KM */
 300                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 301                         err = err2;
 302         }
 303         pfkey_unlock_table();
 304
 305         if (one_sk != NULL)
 306                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 307
 308         if (skb2)
 309                 kfree_skb(skb2);
 310         kfree_skb(skb);
 311         return err;
 312 }
 313
 314 static int pfkey_do_dump(struct pfkey_sock *pfk)
 315 {
 316         struct sadb_msg *hdr;
 317         int rc;
 318
 319         rc = pfk->dump.dump(pfk);
 320         if (rc == -ENOBUFS)
 321                 return 0;
 322
 323         if (pfk->dump.skb) {
 324                 if (!pfkey_can_dump(&pfk->sk))
 325                         return 0;
 326
 327                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 328                 hdr->sadb_msg_seq = 0;
 329                 hdr->sadb_msg_errno = rc;
 330                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 331                                 &pfk->sk);
 332                 pfk->dump.skb = NULL;
 333         }
 334
 335         pfkey_terminate_dump(pfk);
 336         return rc;
 337 }
 338
 339 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 340 {
 341         *new = *orig;
 342 }
 343
 344 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 345 {
 346         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 347         struct sadb_msg *hdr;
 348
 349         if (!skb)
 350                 return -ENOBUFS;
 351
 352         /* Woe be to the platform trying to support PFKEY yet
 353          * having normal errnos outside the 1-255 range, inclusive.
 354          */
 355         err = -err;
 356         if (err == ERESTARTSYS ||
 357             err == ERESTARTNOHAND ||
 358             err == ERESTARTNOINTR)
 359                 err = EINTR;
 360         if (err >= 512)
 361                 err = EINVAL;
 362         BUG_ON(err <= 0 || err >= 256);
 363
 364         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 365         pfkey_hdr_dup(hdr, orig);
 366         hdr->sadb_msg_errno = (uint8_t) err;
 367         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 368                              sizeof(uint64_t));
 369
 370         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 371
 372         return 0;
 373 }
 374
 375 static u8 sadb_ext_min_len[] = {
 376         [SADB_EXT_RESERVED]             = (u8) 0,
 377         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 378         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 379         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 380         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 381         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 382         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 383         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 384         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 385         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 386         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 387         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 388         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 389         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 390         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 391         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 392         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 393         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 394         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 395         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 396         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 397         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 398         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 399         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 400         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 401         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 402 };
 403
 404 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 405 static int verify_address_len(void *p)
 406 {
 407         struct sadb_address *sp = p;
 408         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 409         struct sockaddr_in *sin;
 410 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 411         struct sockaddr_in6 *sin6;
 412 #endif
 413         int len;
 414
 415         switch (addr->sa_family) {
 416         case AF_INET:
 417                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 418                 if (sp->sadb_address_len != len ||
 419                     sp->sadb_address_prefixlen > 32)
 420                         return -EINVAL;
 421                 break;
 422 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 423         case AF_INET6:
 424                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 425                 if (sp->sadb_address_len != len ||
 426                     sp->sadb_address_prefixlen > 128)
 427                         return -EINVAL;
 428                 break;
 429 #endif
 430         default:
 431                 /* It is user using kernel to keep track of security
 432                  * associations for another protocol, such as
 433                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 434                  * lengths.
 435                  *
 436                  * XXX Actually, association/policy database is not yet
 437                  * XXX able to cope with arbitrary sockaddr families.
 438                  * XXX When it can, remove this -EINVAL.  -DaveM
 439                  */
 440                 return -EINVAL;
 441                 break;
 442         }
 443
 444         return 0;
 445 }
 446
 447 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 448 {
 449         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 450                             sec_ctx->sadb_x_ctx_len,
 451                             sizeof(uint64_t));
 452 }
 453
 454 static inline int verify_sec_ctx_len(void *p)
 455 {
 456         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 457         int len = sec_ctx->sadb_x_ctx_len;
 458
 459         if (len > PAGE_SIZE)
 460                 return -EINVAL;
 461
 462         len = pfkey_sec_ctx_len(sec_ctx);
 463
 464         if (sec_ctx->sadb_x_sec_len != len)
 465                 return -EINVAL;
 466
 467         return 0;
 468 }
 469
 470 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 471 {
 472         struct xfrm_user_sec_ctx *uctx = NULL;
 473         int ctx_size = sec_ctx->sadb_x_ctx_len;
 474
 475         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 476
 477         if (!uctx)
 478                 return NULL;
 479
 480         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 481         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 482         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 483         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 484         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 485         memcpy(uctx + 1, sec_ctx + 1,
 486                uctx->ctx_len);
 487
 488         return uctx;
 489 }
 490
 491 static int present_and_same_family(struct sadb_address *src,
 492                                    struct sadb_address *dst)
 493 {
 494         struct sockaddr *s_addr, *d_addr;
 495
 496         if (!src || !dst)
 497                 return 0;
 498
 499         s_addr = (struct sockaddr *)(src + 1);
 500         d_addr = (struct sockaddr *)(dst + 1);
 501         if (s_addr->sa_family != d_addr->sa_family)
 502                 return 0;
 503         if (s_addr->sa_family != AF_INET
 504 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 505             && s_addr->sa_family != AF_INET6
 506 #endif
 507                 )
 508                 return 0;
 509
 510         return 1;
 511 }
 512
 513 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 514 {
 515         char *p = (char *) hdr;
 516         int len = skb->len;
 517
 518         len -= sizeof(*hdr);
 519         p += sizeof(*hdr);
 520         while (len > 0) {
 521                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 522                 uint16_t ext_type;
 523                 int ext_len;
 524
 525                 ext_len  = ehdr->sadb_ext_len;
 526                 ext_len *= sizeof(uint64_t);
 527                 ext_type = ehdr->sadb_ext_type;
 528                 if (ext_len < sizeof(uint64_t) ||
 529                     ext_len > len ||
 530                     ext_type == SADB_EXT_RESERVED)
 531                         return -EINVAL;
 532
 533                 if (ext_type <= SADB_EXT_MAX) {
 534                         int min = (int) sadb_ext_min_len[ext_type];
 535                         if (ext_len < min)
 536                                 return -EINVAL;
 537                         if (ext_hdrs[ext_type-1] != NULL)
 538                                 return -EINVAL;
 539                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 540                             ext_type == SADB_EXT_ADDRESS_DST ||
 541                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 542                             ext_type == SADB_X_EXT_NAT_T_OA) {
 543                                 if (verify_address_len(p))
 544                                         return -EINVAL;
 545                         }
 546                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 547                                 if (verify_sec_ctx_len(p))
 548                                         return -EINVAL;
 549                         }
 550                         ext_hdrs[ext_type-1] = p;
 551                 }
 552                 p   += ext_len;
 553                 len -= ext_len;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static uint16_t
 560 pfkey_satype2proto(uint8_t satype)
 561 {
 562         switch (satype) {
 563         case SADB_SATYPE_UNSPEC:
 564                 return IPSEC_PROTO_ANY;
 565         case SADB_SATYPE_AH:
 566                 return IPPROTO_AH;
 567         case SADB_SATYPE_ESP:
 568                 return IPPROTO_ESP;
 569         case SADB_X_SATYPE_IPCOMP:
 570                 return IPPROTO_COMP;
 571                 break;
 572         default:
 573                 return 0;
 574         }
 575         /* NOTREACHED */
 576 }
 577
 578 static uint8_t
 579 pfkey_proto2satype(uint16_t proto)
 580 {
 581         switch (proto) {
 582         case IPPROTO_AH:
 583                 return SADB_SATYPE_AH;
 584         case IPPROTO_ESP:
 585                 return SADB_SATYPE_ESP;
 586         case IPPROTO_COMP:
 587                 return SADB_X_SATYPE_IPCOMP;
 588                 break;
 589         default:
 590                 return 0;
 591         }
 592         /* NOTREACHED */
 593 }
 594
 595 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 596  * say specifically 'just raw sockets' as we encode them as 255.
 597  */
 598
 599 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 600 {
 601         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 602 }
 603
 604 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 605 {
 606         return (proto ? proto : IPSEC_PROTO_ANY);
 607 }
 608
 609 static inline int pfkey_sockaddr_len(sa_family_t family)
 610 {
 611         switch (family) {
 612         case AF_INET:
 613                 return sizeof(struct sockaddr_in);
 614 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 615         case AF_INET6:
 616                 return sizeof(struct sockaddr_in6);
 617 #endif
 618         }
 619         return 0;
 620 }
 621
 622 static
 623 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 624 {
 625         switch (sa->sa_family) {
 626         case AF_INET:
 627                 xaddr->a4 =
 628                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 629                 return AF_INET;
 630 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 631         case AF_INET6:
 632                 memcpy(xaddr->a6,
 633                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 634                        sizeof(struct in6_addr));
 635                 return AF_INET6;
 636 #endif
 637         }
 638         return 0;
 639 }
 640
 641 static
 642 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
 643 {
 644         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 645                                       xaddr);
 646 }
 647
 648 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 649 {
 650         struct sadb_sa *sa;
 651         struct sadb_address *addr;
 652         uint16_t proto;
 653         unsigned short family;
 654         xfrm_address_t *xaddr;
 655
 656         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 657         if (sa == NULL)
 658                 return NULL;
 659
 660         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 661         if (proto == 0)
 662                 return NULL;
 663
 664         /* sadb_address_len should be checked by caller */
 665         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 666         if (addr == NULL)
 667                 return NULL;
 668
 669         family = ((struct sockaddr *)(addr + 1))->sa_family;
 670         switch (family) {
 671         case AF_INET:
 672                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 673                 break;
 674 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 675         case AF_INET6:
 676                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 677                 break;
 678 #endif
 679         default:
 680                 xaddr = NULL;
 681         }
 682
 683         if (!xaddr)
 684                 return NULL;
 685
 686         return xfrm_state_lookup(&init_net, xaddr, sa->sadb_sa_spi, proto, family);
 687 }
 688
 689 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 690
 691 static int
 692 pfkey_sockaddr_size(sa_family_t family)
 693 {
 694         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 695 }
 696
 697 static inline int pfkey_mode_from_xfrm(int mode)
 698 {
 699         switch(mode) {
 700         case XFRM_MODE_TRANSPORT:
 701                 return IPSEC_MODE_TRANSPORT;
 702         case XFRM_MODE_TUNNEL:
 703                 return IPSEC_MODE_TUNNEL;
 704         case XFRM_MODE_BEET:
 705                 return IPSEC_MODE_BEET;
 706         default:
 707                 return -1;
 708         }
 709 }
 710
 711 static inline int pfkey_mode_to_xfrm(int mode)
 712 {
 713         switch(mode) {
 714         case IPSEC_MODE_ANY:    /*XXX*/
 715         case IPSEC_MODE_TRANSPORT:
 716                 return XFRM_MODE_TRANSPORT;
 717         case IPSEC_MODE_TUNNEL:
 718                 return XFRM_MODE_TUNNEL;
 719         case IPSEC_MODE_BEET:
 720                 return XFRM_MODE_BEET;
 721         default:
 722                 return -1;
 723         }
 724 }
 725
 726 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
 727                                        struct sockaddr *sa,
 728                                        unsigned short family)
 729 {
 730         switch (family) {
 731         case AF_INET:
 732             {
 733                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 734                 sin->sin_family = AF_INET;
 735                 sin->sin_port = port;
 736                 sin->sin_addr.s_addr = xaddr->a4;
 737                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 738                 return 32;
 739             }
 740 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 741         case AF_INET6:
 742             {
 743                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 744                 sin6->sin6_family = AF_INET6;
 745                 sin6->sin6_port = port;
 746                 sin6->sin6_flowinfo = 0;
 747                 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
 748                 sin6->sin6_scope_id = 0;
 749                 return 128;
 750             }
 751 #endif
 752         }
 753         return 0;
 754 }
 755
 756 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
 757                                               int add_keys, int hsc)
 758 {
 759         struct sk_buff *skb;
 760         struct sadb_msg *hdr;
 761         struct sadb_sa *sa;
 762         struct sadb_lifetime *lifetime;
 763         struct sadb_address *addr;
 764         struct sadb_key *key;
 765         struct sadb_x_sa2 *sa2;
 766         struct sadb_x_sec_ctx *sec_ctx;
 767         struct xfrm_sec_ctx *xfrm_ctx;
 768         int ctx_size = 0;
 769         int size;
 770         int auth_key_size = 0;
 771         int encrypt_key_size = 0;
 772         int sockaddr_size;
 773         struct xfrm_encap_tmpl *natt = NULL;
 774         int mode;
 775
 776         /* address family check */
 777         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 778         if (!sockaddr_size)
 779                 return ERR_PTR(-EINVAL);
 780
 781         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 782            key(AE), (identity(SD),) (sensitivity)> */
 783         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 784                 sizeof(struct sadb_lifetime) +
 785                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 786                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 787                         sizeof(struct sadb_address)*2 +
 788                                 sockaddr_size*2 +
 789                                         sizeof(struct sadb_x_sa2);
 790
 791         if ((xfrm_ctx = x->security)) {
 792                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 793                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 794         }
 795
 796         /* identity & sensitivity */
 797         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 798                 size += sizeof(struct sadb_address) + sockaddr_size;
 799
 800         if (add_keys) {
 801                 if (x->aalg && x->aalg->alg_key_len) {
 802                         auth_key_size =
 803                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 804                         size += sizeof(struct sadb_key) + auth_key_size;
 805                 }
 806                 if (x->ealg && x->ealg->alg_key_len) {
 807                         encrypt_key_size =
 808                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 809                         size += sizeof(struct sadb_key) + encrypt_key_size;
 810                 }
 811         }
 812         if (x->encap)
 813                 natt = x->encap;
 814
 815         if (natt && natt->encap_type) {
 816                 size += sizeof(struct sadb_x_nat_t_type);
 817                 size += sizeof(struct sadb_x_nat_t_port);
 818                 size += sizeof(struct sadb_x_nat_t_port);
 819         }
 820
 821         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 822         if (skb == NULL)
 823                 return ERR_PTR(-ENOBUFS);
 824
 825         /* call should fill header later */
 826         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 827         memset(hdr, 0, size);   /* XXX do we need this ? */
 828         hdr->sadb_msg_len = size / sizeof(uint64_t);
 829
 830         /* sa */
 831         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 832         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 833         sa->sadb_sa_exttype = SADB_EXT_SA;
 834         sa->sadb_sa_spi = x->id.spi;
 835         sa->sadb_sa_replay = x->props.replay_window;
 836         switch (x->km.state) {
 837         case XFRM_STATE_VALID:
 838                 sa->sadb_sa_state = x->km.dying ?
 839                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 840                 break;
 841         case XFRM_STATE_ACQ:
 842                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 843                 break;
 844         default:
 845                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 846                 break;
 847         }
 848         sa->sadb_sa_auth = 0;
 849         if (x->aalg) {
 850                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 851                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 852         }
 853         sa->sadb_sa_encrypt = 0;
 854         BUG_ON(x->ealg && x->calg);
 855         if (x->ealg) {
 856                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 857                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 858         }
 859         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 860         if (x->calg) {
 861                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 862                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 863         }
 864
 865         sa->sadb_sa_flags = 0;
 866         if (x->props.flags & XFRM_STATE_NOECN)
 867                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 868         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 869                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 870         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 871                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 872
 873         /* hard time */
 874         if (hsc & 2) {
 875                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 876                                                              sizeof(struct sadb_lifetime));
 877                 lifetime->sadb_lifetime_len =
 878                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 879                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 880                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 881                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 882                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 883                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 884         }
 885         /* soft time */
 886         if (hsc & 1) {
 887                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 888                                                              sizeof(struct sadb_lifetime));
 889                 lifetime->sadb_lifetime_len =
 890                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 891                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 892                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 893                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 894                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 895                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 896         }
 897         /* current time */
 898         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 899                                                      sizeof(struct sadb_lifetime));
 900         lifetime->sadb_lifetime_len =
 901                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 902         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 903         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 904         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 905         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 906         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 907         /* src address */
 908         addr = (struct sadb_address*) skb_put(skb,
 909                                               sizeof(struct sadb_address)+sockaddr_size);
 910         addr->sadb_address_len =
 911                 (sizeof(struct sadb_address)+sockaddr_size)/
 912                         sizeof(uint64_t);
 913         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 914         /* "if the ports are non-zero, then the sadb_address_proto field,
 915            normally zero, MUST be filled in with the transport
 916            protocol's number." - RFC2367 */
 917         addr->sadb_address_proto = 0;
 918         addr->sadb_address_reserved = 0;
 919
 920         addr->sadb_address_prefixlen =
 921                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 922                                     (struct sockaddr *) (addr + 1),
 923                                     x->props.family);
 924         if (!addr->sadb_address_prefixlen)
 925                 BUG();
 926
 927         /* dst address */
 928         addr = (struct sadb_address*) skb_put(skb,
 929                                               sizeof(struct sadb_address)+sockaddr_size);
 930         addr->sadb_address_len =
 931                 (sizeof(struct sadb_address)+sockaddr_size)/
 932                         sizeof(uint64_t);
 933         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 934         addr->sadb_address_proto = 0;
 935         addr->sadb_address_reserved = 0;
 936
 937         addr->sadb_address_prefixlen =
 938                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 939                                     (struct sockaddr *) (addr + 1),
 940                                     x->props.family);
 941         if (!addr->sadb_address_prefixlen)
 942                 BUG();
 943
 944         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 945                           x->props.family)) {
 946                 addr = (struct sadb_address*) skb_put(skb,
 947                         sizeof(struct sadb_address)+sockaddr_size);
 948                 addr->sadb_address_len =
 949                         (sizeof(struct sadb_address)+sockaddr_size)/
 950                         sizeof(uint64_t);
 951                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 952                 addr->sadb_address_proto =
 953                         pfkey_proto_from_xfrm(x->sel.proto);
 954                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 955                 addr->sadb_address_reserved = 0;
 956
 957                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 958                                     (struct sockaddr *) (addr + 1),
 959                                     x->props.family);
 960         }
 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(&init_net);
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(&init_net, 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(&init_net, 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(&init_net, 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(&init_net.xfrm.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(&init_net, 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         c.net = &init_net;
1743         km_state_notify(NULL, &c);
1744
1745         return 0;
1746 }
1747
1748 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1749 {
1750         struct pfkey_sock *pfk = ptr;
1751         struct sk_buff *out_skb;
1752         struct sadb_msg *out_hdr;
1753
1754         if (!pfkey_can_dump(&pfk->sk))
1755                 return -ENOBUFS;
1756
1757         out_skb = pfkey_xfrm_state2msg(x);
1758         if (IS_ERR(out_skb))
1759                 return PTR_ERR(out_skb);
1760
1761         out_hdr = (struct sadb_msg *) out_skb->data;
1762         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1763         out_hdr->sadb_msg_type = SADB_DUMP;
1764         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1765         out_hdr->sadb_msg_errno = 0;
1766         out_hdr->sadb_msg_reserved = 0;
1767         out_hdr->sadb_msg_seq = count + 1;
1768         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1769
1770         if (pfk->dump.skb)
1771                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1772                                 &pfk->sk);
1773         pfk->dump.skb = out_skb;
1774
1775         return 0;
1776 }
1777
1778 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1779 {
1780         return xfrm_state_walk(&init_net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1781 }
1782
1783 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1784 {
1785         xfrm_state_walk_done(&pfk->dump.u.state);
1786 }
1787
1788 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1789 {
1790         u8 proto;
1791         struct pfkey_sock *pfk = pfkey_sk(sk);
1792
1793         if (pfk->dump.dump != NULL)
1794                 return -EBUSY;
1795
1796         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1797         if (proto == 0)
1798                 return -EINVAL;
1799
1800         pfk->dump.msg_version = hdr->sadb_msg_version;
1801         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1802         pfk->dump.dump = pfkey_dump_sa;
1803         pfk->dump.done = pfkey_dump_sa_done;
1804         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1805
1806         return pfkey_do_dump(pfk);
1807 }
1808
1809 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1810 {
1811         struct pfkey_sock *pfk = pfkey_sk(sk);
1812         int satype = hdr->sadb_msg_satype;
1813
1814         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1815                 /* XXX we mangle packet... */
1816                 hdr->sadb_msg_errno = 0;
1817                 if (satype != 0 && satype != 1)
1818                         return -EINVAL;
1819                 pfk->promisc = satype;
1820         }
1821         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1822         return 0;
1823 }
1824
1825 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1826 {
1827         int i;
1828         u32 reqid = *(u32*)ptr;
1829
1830         for (i=0; i<xp->xfrm_nr; i++) {
1831                 if (xp->xfrm_vec[i].reqid == reqid)
1832                         return -EEXIST;
1833         }
1834         return 0;
1835 }
1836
1837 static u32 gen_reqid(void)
1838 {
1839         struct xfrm_policy_walk walk;
1840         u32 start;
1841         int rc;
1842         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1843
1844         start = reqid;
1845         do {
1846                 ++reqid;
1847                 if (reqid == 0)
1848                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1849                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1850                 rc = xfrm_policy_walk(&init_net, &walk, check_reqid, (void*)&reqid);
1851                 xfrm_policy_walk_done(&walk);
1852                 if (rc != -EEXIST)
1853                         return reqid;
1854         } while (reqid != start);
1855         return 0;
1856 }
1857
1858 static int
1859 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1860 {
1861         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1862         int mode;
1863
1864         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1865                 return -ELOOP;
1866
1867         if (rq->sadb_x_ipsecrequest_mode == 0)
1868                 return -EINVAL;
1869
1870         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1871         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1872                 return -EINVAL;
1873         t->mode = mode;
1874         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1875                 t->optional = 1;
1876         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1877                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1878                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1879                         t->reqid = 0;
1880                 if (!t->reqid && !(t->reqid = gen_reqid()))
1881                         return -ENOBUFS;
1882         }
1883
1884         /* addresses present only in tunnel mode */
1885         if (t->mode == XFRM_MODE_TUNNEL) {
1886                 u8 *sa = (u8 *) (rq + 1);
1887                 int family, socklen;
1888
1889                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1890                                                 &t->saddr);
1891                 if (!family)
1892                         return -EINVAL;
1893
1894                 socklen = pfkey_sockaddr_len(family);
1895                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1896                                            &t->id.daddr) != family)
1897                         return -EINVAL;
1898                 t->encap_family = family;
1899         } else
1900                 t->encap_family = xp->family;
1901
1902         /* No way to set this via kame pfkey */
1903         t->allalgs = 1;
1904         xp->xfrm_nr++;
1905         return 0;
1906 }
1907
1908 static int
1909 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1910 {
1911         int err;
1912         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1913         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1914
1915         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1916                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1917                         return err;
1918                 len -= rq->sadb_x_ipsecrequest_len;
1919                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1920         }
1921         return 0;
1922 }
1923
1924 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1925 {
1926   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1927
1928         if (xfrm_ctx) {
1929                 int len = sizeof(struct sadb_x_sec_ctx);
1930                 len += xfrm_ctx->ctx_len;
1931                 return PFKEY_ALIGN8(len);
1932         }
1933         return 0;
1934 }
1935
1936 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1937 {
1938         struct xfrm_tmpl *t;
1939         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1940         int socklen = 0;
1941         int i;
1942
1943         for (i=0; i<xp->xfrm_nr; i++) {
1944                 t = xp->xfrm_vec + i;
1945                 socklen += pfkey_sockaddr_len(t->encap_family);
1946         }
1947
1948         return sizeof(struct sadb_msg) +
1949                 (sizeof(struct sadb_lifetime) * 3) +
1950                 (sizeof(struct sadb_address) * 2) +
1951                 (sockaddr_size * 2) +
1952                 sizeof(struct sadb_x_policy) +
1953                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1954                 (socklen * 2) +
1955                 pfkey_xfrm_policy2sec_ctx_size(xp);
1956 }
1957
1958 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1959 {
1960         struct sk_buff *skb;
1961         int size;
1962
1963         size = pfkey_xfrm_policy2msg_size(xp);
1964
1965         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1966         if (skb == NULL)
1967                 return ERR_PTR(-ENOBUFS);
1968
1969         return skb;
1970 }
1971
1972 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1973 {
1974         struct sadb_msg *hdr;
1975         struct sadb_address *addr;
1976         struct sadb_lifetime *lifetime;
1977         struct sadb_x_policy *pol;
1978         struct sadb_x_sec_ctx *sec_ctx;
1979         struct xfrm_sec_ctx *xfrm_ctx;
1980         int i;
1981         int size;
1982         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1983         int socklen = pfkey_sockaddr_len(xp->family);
1984
1985         size = pfkey_xfrm_policy2msg_size(xp);
1986
1987         /* call should fill header later */
1988         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1989         memset(hdr, 0, size);   /* XXX do we need this ? */
1990
1991         /* src address */
1992         addr = (struct sadb_address*) skb_put(skb,
1993                                               sizeof(struct sadb_address)+sockaddr_size);
1994         addr->sadb_address_len =
1995                 (sizeof(struct sadb_address)+sockaddr_size)/
1996                         sizeof(uint64_t);
1997         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1998         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1999         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2000         addr->sadb_address_reserved = 0;
2001         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2002                                  xp->selector.sport,
2003                                  (struct sockaddr *) (addr + 1),
2004                                  xp->family))
2005                 BUG();
2006
2007         /* dst address */
2008         addr = (struct sadb_address*) skb_put(skb,
2009                                               sizeof(struct sadb_address)+sockaddr_size);
2010         addr->sadb_address_len =
2011                 (sizeof(struct sadb_address)+sockaddr_size)/
2012                         sizeof(uint64_t);
2013         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2014         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2015         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2016         addr->sadb_address_reserved = 0;
2017
2018         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2019                             (struct sockaddr *) (addr + 1),
2020                             xp->family);
2021
2022         /* hard time */
2023         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2024                                                      sizeof(struct sadb_lifetime));
2025         lifetime->sadb_lifetime_len =
2026                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2027         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2028         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2029         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2030         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2031         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2032         /* soft time */
2033         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2034                                                      sizeof(struct sadb_lifetime));
2035         lifetime->sadb_lifetime_len =
2036                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2037         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2038         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2039         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2040         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2041         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2042         /* current time */
2043         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2044                                                      sizeof(struct sadb_lifetime));
2045         lifetime->sadb_lifetime_len =
2046                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2047         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2048         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2049         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2050         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2051         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2052
2053         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2054         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2055         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2056         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2057         if (xp->action == XFRM_POLICY_ALLOW) {
2058                 if (xp->xfrm_nr)
2059                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2060                 else
2061                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2062         }
2063         pol->sadb_x_policy_dir = dir+1;
2064         pol->sadb_x_policy_id = xp->index;
2065         pol->sadb_x_policy_priority = xp->priority;
2066
2067         for (i=0; i<xp->xfrm_nr; i++) {
2068                 struct sadb_x_ipsecrequest *rq;
2069                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2070                 int req_size;
2071                 int mode;
2072
2073                 req_size = sizeof(struct sadb_x_ipsecrequest);
2074                 if (t->mode == XFRM_MODE_TUNNEL) {
2075                         socklen = pfkey_sockaddr_len(t->encap_family);
2076                         req_size += socklen * 2;
2077                 } else {
2078                         size -= 2*socklen;
2079                 }
2080                 rq = (void*)skb_put(skb, req_size);
2081                 pol->sadb_x_policy_len += req_size/8;
2082                 memset(rq, 0, sizeof(*rq));
2083                 rq->sadb_x_ipsecrequest_len = req_size;
2084                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2085                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2086                         return -EINVAL;
2087                 rq->sadb_x_ipsecrequest_mode = mode;
2088                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2089                 if (t->reqid)
2090                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2091                 if (t->optional)
2092                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2093                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2094
2095                 if (t->mode == XFRM_MODE_TUNNEL) {
2096                         u8 *sa = (void *)(rq + 1);
2097                         pfkey_sockaddr_fill(&t->saddr, 0,
2098                                             (struct sockaddr *)sa,
2099                                             t->encap_family);
2100                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2101                                             (struct sockaddr *) (sa + socklen),
2102                                             t->encap_family);
2103                 }
2104         }
2105
2106         /* security context */
2107         if ((xfrm_ctx = xp->security)) {
2108                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2109
2110                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2111                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2112                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2113                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2114                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2115                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2116                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2117                        xfrm_ctx->ctx_len);
2118         }
2119
2120         hdr->sadb_msg_len = size / sizeof(uint64_t);
2121         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2122
2123         return 0;
2124 }
2125
2126 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2127 {
2128         struct sk_buff *out_skb;
2129         struct sadb_msg *out_hdr;
2130         int err;
2131
2132         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2133         if (IS_ERR(out_skb)) {
2134                 err = PTR_ERR(out_skb);
2135                 goto out;
2136         }
2137         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2138         if (err < 0)
2139                 return err;
2140
2141         out_hdr = (struct sadb_msg *) out_skb->data;
2142         out_hdr->sadb_msg_version = PF_KEY_V2;
2143
2144         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2145                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2146         else
2147                 out_hdr->sadb_msg_type = event2poltype(c->event);
2148         out_hdr->sadb_msg_errno = 0;
2149         out_hdr->sadb_msg_seq = c->seq;
2150         out_hdr->sadb_msg_pid = c->pid;
2151         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2152 out:
2153         return 0;
2154
2155 }
2156
2157 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2158 {
2159         int err = 0;
2160         struct sadb_lifetime *lifetime;
2161         struct sadb_address *sa;
2162         struct sadb_x_policy *pol;
2163         struct xfrm_policy *xp;
2164         struct km_event c;
2165         struct sadb_x_sec_ctx *sec_ctx;
2166
2167         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2168                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2169             !ext_hdrs[SADB_X_EXT_POLICY-1])
2170                 return -EINVAL;
2171
2172         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2173         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2174                 return -EINVAL;
2175         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2176                 return -EINVAL;
2177
2178         xp = xfrm_policy_alloc(&init_net, GFP_KERNEL);
2179         if (xp == NULL)
2180                 return -ENOBUFS;
2181
2182         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2183                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2184         xp->priority = pol->sadb_x_policy_priority;
2185
2186         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2188         if (!xp->family) {
2189                 err = -EINVAL;
2190                 goto out;
2191         }
2192         xp->selector.family = xp->family;
2193         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2194         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2195         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2196         if (xp->selector.sport)
2197                 xp->selector.sport_mask = htons(0xffff);
2198
2199         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2200         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2201         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2202
2203         /* Amusing, we set this twice.  KAME apps appear to set same value
2204          * in both addresses.
2205          */
2206         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2207
2208         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2209         if (xp->selector.dport)
2210                 xp->selector.dport_mask = htons(0xffff);
2211
2212         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2213         if (sec_ctx != NULL) {
2214                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2215
2216                 if (!uctx) {
2217                         err = -ENOBUFS;
2218                         goto out;
2219                 }
2220
2221                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2222                 kfree(uctx);
2223
2224                 if (err)
2225                         goto out;
2226         }
2227
2228         xp->lft.soft_byte_limit = XFRM_INF;
2229         xp->lft.hard_byte_limit = XFRM_INF;
2230         xp->lft.soft_packet_limit = XFRM_INF;
2231         xp->lft.hard_packet_limit = XFRM_INF;
2232         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2233                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2234                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2235                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2236                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2237         }
2238         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2239                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2240                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2241                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2242                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2243         }
2244         xp->xfrm_nr = 0;
2245         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2246             (err = parse_ipsecrequests(xp, pol)) < 0)
2247                 goto out;
2248
2249         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2250                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2251
2252         xfrm_audit_policy_add(xp, err ? 0 : 1,
2253                               audit_get_loginuid(current),
2254                               audit_get_sessionid(current), 0);
2255
2256         if (err)
2257                 goto out;
2258
2259         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2260                 c.event = XFRM_MSG_UPDPOLICY;
2261         else
2262                 c.event = XFRM_MSG_NEWPOLICY;
2263
2264         c.seq = hdr->sadb_msg_seq;
2265         c.pid = hdr->sadb_msg_pid;
2266
2267         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2268         xfrm_pol_put(xp);
2269         return 0;
2270
2271 out:
2272         xp->walk.dead = 1;
2273         xfrm_policy_destroy(xp);
2274         return err;
2275 }
2276
2277 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2278 {
2279         int err;
2280         struct sadb_address *sa;
2281         struct sadb_x_policy *pol;
2282         struct xfrm_policy *xp;
2283         struct xfrm_selector sel;
2284         struct km_event c;
2285         struct sadb_x_sec_ctx *sec_ctx;
2286         struct xfrm_sec_ctx *pol_ctx = NULL;
2287
2288         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2289                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2290             !ext_hdrs[SADB_X_EXT_POLICY-1])
2291                 return -EINVAL;
2292
2293         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2294         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2295                 return -EINVAL;
2296
2297         memset(&sel, 0, sizeof(sel));
2298
2299         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2300         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2301         sel.prefixlen_s = sa->sadb_address_prefixlen;
2302         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2303         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2304         if (sel.sport)
2305                 sel.sport_mask = htons(0xffff);
2306
2307         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2308         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2309         sel.prefixlen_d = sa->sadb_address_prefixlen;
2310         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2311         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2312         if (sel.dport)
2313                 sel.dport_mask = htons(0xffff);
2314
2315         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2316         if (sec_ctx != NULL) {
2317                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2318
2319                 if (!uctx)
2320                         return -ENOMEM;
2321
2322                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2323                 kfree(uctx);
2324                 if (err)
2325                         return err;
2326         }
2327
2328         xp = xfrm_policy_bysel_ctx(&init_net, XFRM_POLICY_TYPE_MAIN,
2329                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2330                                    1, &err);
2331         security_xfrm_policy_free(pol_ctx);
2332         if (xp == NULL)
2333                 return -ENOENT;
2334
2335         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2336                                  audit_get_loginuid(current),
2337                                  audit_get_sessionid(current), 0);
2338
2339         if (err)
2340                 goto out;
2341
2342         c.seq = hdr->sadb_msg_seq;
2343         c.pid = hdr->sadb_msg_pid;
2344         c.data.byid = 0;
2345         c.event = XFRM_MSG_DELPOLICY;
2346         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2347
2348 out:
2349         xfrm_pol_put(xp);
2350         return err;
2351 }
2352
2353 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2354 {
2355         int err;
2356         struct sk_buff *out_skb;
2357         struct sadb_msg *out_hdr;
2358         err = 0;
2359
2360         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2361         if (IS_ERR(out_skb)) {
2362                 err =  PTR_ERR(out_skb);
2363                 goto out;
2364         }
2365         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2366         if (err < 0)
2367                 goto out;
2368
2369         out_hdr = (struct sadb_msg *) out_skb->data;
2370         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2371         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2372         out_hdr->sadb_msg_satype = 0;
2373         out_hdr->sadb_msg_errno = 0;
2374         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2375         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2376         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2377         err = 0;
2378
2379 out:
2380         return err;
2381 }
2382
2383 #ifdef CONFIG_NET_KEY_MIGRATE
2384 static int pfkey_sockaddr_pair_size(sa_family_t family)
2385 {
2386         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2387 }
2388
2389 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2390                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2391                                u16 *family)
2392 {
2393         int af, socklen;
2394
2395         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2396                 return -EINVAL;
2397
2398         af = pfkey_sockaddr_extract(sa, saddr);
2399         if (!af)
2400                 return -EINVAL;
2401
2402         socklen = pfkey_sockaddr_len(af);
2403         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2404                                    daddr) != af)
2405                 return -EINVAL;
2406
2407         *family = af;
2408         return 0;
2409 }
2410
2411 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2412                                     struct xfrm_migrate *m)
2413 {
2414         int err;
2415         struct sadb_x_ipsecrequest *rq2;
2416         int mode;
2417
2418         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2419             len < rq1->sadb_x_ipsecrequest_len)
2420                 return -EINVAL;
2421
2422         /* old endoints */
2423         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2424                                   rq1->sadb_x_ipsecrequest_len,
2425                                   &m->old_saddr, &m->old_daddr,
2426                                   &m->old_family);
2427         if (err)
2428                 return err;
2429
2430         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2431         len -= rq1->sadb_x_ipsecrequest_len;
2432
2433         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2434             len < rq2->sadb_x_ipsecrequest_len)
2435                 return -EINVAL;
2436
2437         /* new endpoints */
2438         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2439                                   rq2->sadb_x_ipsecrequest_len,
2440                                   &m->new_saddr, &m->new_daddr,
2441                                   &m->new_family);
2442         if (err)
2443                 return err;
2444
2445         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2446             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2447             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2448                 return -EINVAL;
2449
2450         m->proto = rq1->sadb_x_ipsecrequest_proto;
2451         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2452                 return -EINVAL;
2453         m->mode = mode;
2454         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2455
2456         return ((int)(rq1->sadb_x_ipsecrequest_len +
2457                       rq2->sadb_x_ipsecrequest_len));
2458 }
2459
2460 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2461                          struct sadb_msg *hdr, void **ext_hdrs)
2462 {
2463         int i, len, ret, err = -EINVAL;
2464         u8 dir;
2465         struct sadb_address *sa;
2466         struct sadb_x_kmaddress *kma;
2467         struct sadb_x_policy *pol;
2468         struct sadb_x_ipsecrequest *rq;
2469         struct xfrm_selector sel;
2470         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2471         struct xfrm_kmaddress k;
2472
2473         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2474                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2475             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2476                 err = -EINVAL;
2477                 goto out;
2478         }
2479
2480         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2481         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2482
2483         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2484                 err = -EINVAL;
2485                 goto out;
2486         }
2487
2488         if (kma) {
2489                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2490                 k.reserved = kma->sadb_x_kmaddress_reserved;
2491                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2492                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2493                                           &k.local, &k.remote, &k.family);
2494                 if (ret < 0) {
2495                         err = ret;
2496                         goto out;
2497                 }
2498         }
2499
2500         dir = pol->sadb_x_policy_dir - 1;
2501         memset(&sel, 0, sizeof(sel));
2502
2503         /* set source address info of selector */
2504         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2505         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2506         sel.prefixlen_s = sa->sadb_address_prefixlen;
2507         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2508         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2509         if (sel.sport)
2510                 sel.sport_mask = htons(0xffff);
2511
2512         /* set destination address info of selector */
2513         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2514         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2515         sel.prefixlen_d = sa->sadb_address_prefixlen;
2516         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2517         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2518         if (sel.dport)
2519                 sel.dport_mask = htons(0xffff);
2520
2521         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2522
2523         /* extract ipsecrequests */
2524         i = 0;
2525         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2526
2527         while (len > 0 && i < XFRM_MAX_DEPTH) {
2528                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2529                 if (ret < 0) {
2530                         err = ret;
2531                         goto out;
2532                 } else {
2533                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2534                         len -= ret;
2535                         i++;
2536                 }
2537         }
2538
2539         if (!i || len > 0) {
2540                 err = -EINVAL;
2541                 goto out;
2542         }
2543
2544         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2545                             kma ? &k : NULL);
2546
2547  out:
2548         return err;
2549 }
2550 #else
2551 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2552                          struct sadb_msg *hdr, void **ext_hdrs)
2553 {
2554         return -ENOPROTOOPT;
2555 }
2556 #endif
2557
2558
2559 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2560 {
2561         unsigned int dir;
2562         int err = 0, delete;
2563         struct sadb_x_policy *pol;
2564         struct xfrm_policy *xp;
2565         struct km_event c;
2566
2567         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2568                 return -EINVAL;
2569
2570         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2571         if (dir >= XFRM_POLICY_MAX)
2572                 return -EINVAL;
2573
2574         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2575         xp = xfrm_policy_byid(&init_net, XFRM_POLICY_TYPE_MAIN, dir,
2576                               pol->sadb_x_policy_id, delete, &err);
2577         if (xp == NULL)
2578                 return -ENOENT;
2579
2580         if (delete) {
2581                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2582                                 audit_get_loginuid(current),
2583                                 audit_get_sessionid(current), 0);
2584
2585                 if (err)
2586                         goto out;
2587                 c.seq = hdr->sadb_msg_seq;
2588                 c.pid = hdr->sadb_msg_pid;
2589                 c.data.byid = 1;
2590                 c.event = XFRM_MSG_DELPOLICY;
2591                 km_policy_notify(xp, dir, &c);
2592         } else {
2593                 err = key_pol_get_resp(sk, xp, hdr, dir);
2594         }
2595
2596 out:
2597         xfrm_pol_put(xp);
2598         return err;
2599 }
2600
2601 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2602 {
2603         struct pfkey_sock *pfk = ptr;
2604         struct sk_buff *out_skb;
2605         struct sadb_msg *out_hdr;
2606         int err;
2607
2608         if (!pfkey_can_dump(&pfk->sk))
2609                 return -ENOBUFS;
2610
2611         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2612         if (IS_ERR(out_skb))
2613                 return PTR_ERR(out_skb);
2614
2615         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2616         if (err < 0)
2617                 return err;
2618
2619         out_hdr = (struct sadb_msg *) out_skb->data;
2620         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2621         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2622         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2623         out_hdr->sadb_msg_errno = 0;
2624         out_hdr->sadb_msg_seq = count + 1;
2625         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2626
2627         if (pfk->dump.skb)
2628                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2629                                 &pfk->sk);
2630         pfk->dump.skb = out_skb;
2631
2632         return 0;
2633 }
2634
2635 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2636 {
2637         return xfrm_policy_walk(&init_net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2638 }
2639
2640 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2641 {
2642         xfrm_policy_walk_done(&pfk->dump.u.policy);
2643 }
2644
2645 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2646 {
2647         struct pfkey_sock *pfk = pfkey_sk(sk);
2648
2649         if (pfk->dump.dump != NULL)
2650                 return -EBUSY;
2651
2652         pfk->dump.msg_version = hdr->sadb_msg_version;
2653         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2654         pfk->dump.dump = pfkey_dump_sp;
2655         pfk->dump.done = pfkey_dump_sp_done;
2656         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2657
2658         return pfkey_do_dump(pfk);
2659 }
2660
2661 static int key_notify_policy_flush(struct km_event *c)
2662 {
2663         struct sk_buff *skb_out;
2664         struct sadb_msg *hdr;
2665
2666         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2667         if (!skb_out)
2668                 return -ENOBUFS;
2669         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2670         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2671         hdr->sadb_msg_seq = c->seq;
2672         hdr->sadb_msg_pid = c->pid;
2673         hdr->sadb_msg_version = PF_KEY_V2;
2674         hdr->sadb_msg_errno = (uint8_t) 0;
2675         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2676         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2677         return 0;
2678
2679 }
2680
2681 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2682 {
2683         struct km_event c;
2684         struct xfrm_audit audit_info;
2685         int err;
2686
2687         audit_info.loginuid = audit_get_loginuid(current);
2688         audit_info.sessionid = audit_get_sessionid(current);
2689         audit_info.secid = 0;
2690         err = xfrm_policy_flush(&init_net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2691         if (err)
2692                 return err;
2693         c.data.type = XFRM_POLICY_TYPE_MAIN;
2694         c.event = XFRM_MSG_FLUSHPOLICY;
2695         c.pid = hdr->sadb_msg_pid;
2696         c.seq = hdr->sadb_msg_seq;
2697         c.net = &init_net;
2698         km_policy_notify(NULL, 0, &c);
2699
2700         return 0;
2701 }
2702
2703 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2704                              struct sadb_msg *hdr, void **ext_hdrs);
2705 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2706         [SADB_RESERVED]         = pfkey_reserved,
2707         [SADB_GETSPI]           = pfkey_getspi,
2708         [SADB_UPDATE]           = pfkey_add,
2709         [SADB_ADD]              = pfkey_add,
2710         [SADB_DELETE]           = pfkey_delete,
2711         [SADB_GET]              = pfkey_get,
2712         [SADB_ACQUIRE]          = pfkey_acquire,
2713         [SADB_REGISTER]         = pfkey_register,
2714         [SADB_EXPIRE]           = NULL,
2715         [SADB_FLUSH]            = pfkey_flush,
2716         [SADB_DUMP]             = pfkey_dump,
2717         [SADB_X_PROMISC]        = pfkey_promisc,
2718         [SADB_X_PCHANGE]        = NULL,
2719         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2720         [SADB_X_SPDADD]         = pfkey_spdadd,
2721         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2722         [SADB_X_SPDGET]         = pfkey_spdget,
2723         [SADB_X_SPDACQUIRE]     = NULL,
2724         [SADB_X_SPDDUMP]        = pfkey_spddump,
2725         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2726         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2727         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2728         [SADB_X_MIGRATE]        = pfkey_migrate,
2729 };
2730
2731 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2732 {
2733         void *ext_hdrs[SADB_EXT_MAX];
2734         int err;
2735
2736         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2737                         BROADCAST_PROMISC_ONLY, NULL);
2738
2739         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2740         err = parse_exthdrs(skb, hdr, ext_hdrs);
2741         if (!err) {
2742                 err = -EOPNOTSUPP;
2743                 if (pfkey_funcs[hdr->sadb_msg_type])
2744                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2745         }
2746         return err;
2747 }
2748
2749 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2750 {
2751         struct sadb_msg *hdr = NULL;
2752
2753         if (skb->len < sizeof(*hdr)) {
2754                 *errp = -EMSGSIZE;
2755         } else {
2756                 hdr = (struct sadb_msg *) skb->data;
2757                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2758                     hdr->sadb_msg_reserved != 0 ||
2759                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2760                      hdr->sadb_msg_type > SADB_MAX)) {
2761                         hdr = NULL;
2762                         *errp = -EINVAL;
2763                 } else if (hdr->sadb_msg_len != (skb->len /
2764                                                  sizeof(uint64_t)) ||
2765                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2766                                                 sizeof(uint64_t))) {
2767                         hdr = NULL;
2768                         *errp = -EMSGSIZE;
2769                 } else {
2770                         *errp = 0;
2771                 }
2772         }
2773         return hdr;
2774 }
2775
2776 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2777 {
2778         unsigned int id = d->desc.sadb_alg_id;
2779
2780         if (id >= sizeof(t->aalgos) * 8)
2781                 return 0;
2782
2783         return (t->aalgos >> id) & 1;
2784 }
2785
2786 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2787 {
2788         unsigned int id = d->desc.sadb_alg_id;
2789
2790         if (id >= sizeof(t->ealgos) * 8)
2791                 return 0;
2792
2793         return (t->ealgos >> id) & 1;
2794 }
2795
2796 static int count_ah_combs(struct xfrm_tmpl *t)
2797 {
2798         int i, sz = 0;
2799
2800         for (i = 0; ; i++) {
2801                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2802                 if (!aalg)
2803                         break;
2804                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2805                         sz += sizeof(struct sadb_comb);
2806         }
2807         return sz + sizeof(struct sadb_prop);
2808 }
2809
2810 static int count_esp_combs(struct xfrm_tmpl *t)
2811 {
2812         int i, k, sz = 0;
2813
2814         for (i = 0; ; i++) {
2815                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2816                 if (!ealg)
2817                         break;
2818
2819                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2820                         continue;
2821
2822                 for (k = 1; ; k++) {
2823                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2824                         if (!aalg)
2825                                 break;
2826
2827                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2828                                 sz += sizeof(struct sadb_comb);
2829                 }
2830         }
2831         return sz + sizeof(struct sadb_prop);
2832 }
2833
2834 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2835 {
2836         struct sadb_prop *p;
2837         int i;
2838
2839         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2840         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2841         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2842         p->sadb_prop_replay = 32;
2843         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2844
2845         for (i = 0; ; i++) {
2846                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2847                 if (!aalg)
2848                         break;
2849
2850                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2851                         struct sadb_comb *c;
2852                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2853                         memset(c, 0, sizeof(*c));
2854                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2855                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2856                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2857                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2858                         c->sadb_comb_hard_addtime = 24*60*60;
2859                         c->sadb_comb_soft_addtime = 20*60*60;
2860                         c->sadb_comb_hard_usetime = 8*60*60;
2861                         c->sadb_comb_soft_usetime = 7*60*60;
2862                 }
2863         }
2864 }
2865
2866 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2867 {
2868         struct sadb_prop *p;
2869         int i, k;
2870
2871         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2872         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2873         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2874         p->sadb_prop_replay = 32;
2875         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2876
2877         for (i=0; ; i++) {
2878                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2879                 if (!ealg)
2880                         break;
2881
2882                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2883                         continue;
2884
2885                 for (k = 1; ; k++) {
2886                         struct sadb_comb *c;
2887                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2888                         if (!aalg)
2889                                 break;
2890                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2891                                 continue;
2892                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2893                         memset(c, 0, sizeof(*c));
2894                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2895                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2896                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2897                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2898                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2899                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2900                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2901                         c->sadb_comb_hard_addtime = 24*60*60;
2902                         c->sadb_comb_soft_addtime = 20*60*60;
2903                         c->sadb_comb_hard_usetime = 8*60*60;
2904                         c->sadb_comb_soft_usetime = 7*60*60;
2905                 }
2906         }
2907 }
2908
2909 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2910 {
2911         return 0;
2912 }
2913
2914 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2915 {
2916         struct sk_buff *out_skb;
2917         struct sadb_msg *out_hdr;
2918         int hard;
2919         int hsc;
2920
2921         hard = c->data.hard;
2922         if (hard)
2923                 hsc = 2;
2924         else
2925                 hsc = 1;
2926
2927         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2928         if (IS_ERR(out_skb))
2929                 return PTR_ERR(out_skb);
2930
2931         out_hdr = (struct sadb_msg *) out_skb->data;
2932         out_hdr->sadb_msg_version = PF_KEY_V2;
2933         out_hdr->sadb_msg_type = SADB_EXPIRE;
2934         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2935         out_hdr->sadb_msg_errno = 0;
2936         out_hdr->sadb_msg_reserved = 0;
2937         out_hdr->sadb_msg_seq = 0;
2938         out_hdr->sadb_msg_pid = 0;
2939
2940         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2941         return 0;
2942 }
2943
2944 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2945 {
2946         if (atomic_read(&pfkey_socks_nr) == 0)
2947                 return 0;
2948
2949         switch (c->event) {
2950         case XFRM_MSG_EXPIRE:
2951                 return key_notify_sa_expire(x, c);
2952         case XFRM_MSG_DELSA:
2953         case XFRM_MSG_NEWSA:
2954         case XFRM_MSG_UPDSA:
2955                 return key_notify_sa(x, c);
2956         case XFRM_MSG_FLUSHSA:
2957                 return key_notify_sa_flush(c);
2958         case XFRM_MSG_NEWAE: /* not yet supported */
2959                 break;
2960         default:
2961                 printk("pfkey: Unknown SA event %d\n", c->event);
2962                 break;
2963         }
2964
2965         return 0;
2966 }
2967
2968 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2969 {
2970         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2971                 return 0;
2972
2973         switch (c->event) {
2974         case XFRM_MSG_POLEXPIRE:
2975                 return key_notify_policy_expire(xp, c);
2976         case XFRM_MSG_DELPOLICY:
2977         case XFRM_MSG_NEWPOLICY:
2978         case XFRM_MSG_UPDPOLICY:
2979                 return key_notify_policy(xp, dir, c);
2980         case XFRM_MSG_FLUSHPOLICY:
2981                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2982                         break;
2983                 return key_notify_policy_flush(c);
2984         default:
2985                 printk("pfkey: Unknown policy event %d\n", c->event);
2986                 break;
2987         }
2988
2989         return 0;
2990 }
2991
2992 static u32 get_acqseq(void)
2993 {
2994         u32 res;
2995         static u32 acqseq;
2996         static DEFINE_SPINLOCK(acqseq_lock);
2997
2998         spin_lock_bh(&acqseq_lock);
2999         res = (++acqseq ? : ++acqseq);
3000         spin_unlock_bh(&acqseq_lock);
3001         return res;
3002 }
3003
3004 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3005 {
3006         struct sk_buff *skb;
3007         struct sadb_msg *hdr;
3008         struct sadb_address *addr;
3009         struct sadb_x_policy *pol;
3010         int sockaddr_size;
3011         int size;
3012         struct sadb_x_sec_ctx *sec_ctx;
3013         struct xfrm_sec_ctx *xfrm_ctx;
3014         int ctx_size = 0;
3015
3016         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3017         if (!sockaddr_size)
3018                 return -EINVAL;
3019
3020         size = sizeof(struct sadb_msg) +
3021                 (sizeof(struct sadb_address) * 2) +
3022                 (sockaddr_size * 2) +
3023                 sizeof(struct sadb_x_policy);
3024
3025         if (x->id.proto == IPPROTO_AH)
3026                 size += count_ah_combs(t);
3027         else if (x->id.proto == IPPROTO_ESP)
3028                 size += count_esp_combs(t);
3029
3030         if ((xfrm_ctx = x->security)) {
3031                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3032                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3033         }
3034
3035         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3036         if (skb == NULL)
3037                 return -ENOMEM;
3038
3039         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3040         hdr->sadb_msg_version = PF_KEY_V2;
3041         hdr->sadb_msg_type = SADB_ACQUIRE;
3042         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3043         hdr->sadb_msg_len = size / sizeof(uint64_t);
3044         hdr->sadb_msg_errno = 0;
3045         hdr->sadb_msg_reserved = 0;
3046         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3047         hdr->sadb_msg_pid = 0;
3048
3049         /* src address */
3050         addr = (struct sadb_address*) skb_put(skb,
3051                                               sizeof(struct sadb_address)+sockaddr_size);
3052         addr->sadb_address_len =
3053                 (sizeof(struct sadb_address)+sockaddr_size)/
3054                         sizeof(uint64_t);
3055         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3056         addr->sadb_address_proto = 0;
3057         addr->sadb_address_reserved = 0;
3058         addr->sadb_address_prefixlen =
3059                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3060                                     (struct sockaddr *) (addr + 1),
3061                                     x->props.family);
3062         if (!addr->sadb_address_prefixlen)
3063                 BUG();
3064
3065         /* dst address */
3066         addr = (struct sadb_address*) skb_put(skb,
3067                                               sizeof(struct sadb_address)+sockaddr_size);
3068         addr->sadb_address_len =
3069                 (sizeof(struct sadb_address)+sockaddr_size)/
3070                         sizeof(uint64_t);
3071         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3072         addr->sadb_address_proto = 0;
3073         addr->sadb_address_reserved = 0;
3074         addr->sadb_address_prefixlen =
3075                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3076                                     (struct sockaddr *) (addr + 1),
3077                                     x->props.family);
3078         if (!addr->sadb_address_prefixlen)
3079                 BUG();
3080
3081         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3082         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3083         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3084         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3085         pol->sadb_x_policy_dir = dir+1;
3086         pol->sadb_x_policy_id = xp->index;
3087
3088         /* Set sadb_comb's. */
3089         if (x->id.proto == IPPROTO_AH)
3090                 dump_ah_combs(skb, t);
3091         else if (x->id.proto == IPPROTO_ESP)
3092                 dump_esp_combs(skb, t);
3093
3094         /* security context */
3095         if (xfrm_ctx) {
3096                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3097                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3098                 sec_ctx->sadb_x_sec_len =
3099                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3100                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3101                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3102                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3103                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3104                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3105                        xfrm_ctx->ctx_len);
3106         }
3107
3108         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3109 }
3110
3111 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3112                                                 u8 *data, int len, int *dir)
3113 {
3114         struct xfrm_policy *xp;
3115         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3116         struct sadb_x_sec_ctx *sec_ctx;
3117
3118         switch (sk->sk_family) {
3119         case AF_INET:
3120                 if (opt != IP_IPSEC_POLICY) {
3121                         *dir = -EOPNOTSUPP;
3122                         return NULL;
3123                 }
3124                 break;
3125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3126         case AF_INET6:
3127                 if (opt != IPV6_IPSEC_POLICY) {
3128                         *dir = -EOPNOTSUPP;
3129                         return NULL;
3130                 }
3131                 break;
3132 #endif
3133         default:
3134                 *dir = -EINVAL;
3135                 return NULL;
3136         }
3137
3138         *dir = -EINVAL;
3139
3140         if (len < sizeof(struct sadb_x_policy) ||
3141             pol->sadb_x_policy_len*8 > len ||
3142             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3143             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3144                 return NULL;
3145
3146         xp = xfrm_policy_alloc(&init_net, GFP_ATOMIC);
3147         if (xp == NULL) {
3148                 *dir = -ENOBUFS;
3149                 return NULL;
3150         }
3151
3152         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3153                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3154
3155         xp->lft.soft_byte_limit = XFRM_INF;
3156         xp->lft.hard_byte_limit = XFRM_INF;
3157         xp->lft.soft_packet_limit = XFRM_INF;
3158         xp->lft.hard_packet_limit = XFRM_INF;
3159         xp->family = sk->sk_family;
3160
3161         xp->xfrm_nr = 0;
3162         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3163             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3164                 goto out;
3165
3166         /* security context too */
3167         if (len >= (pol->sadb_x_policy_len*8 +
3168             sizeof(struct sadb_x_sec_ctx))) {
3169                 char *p = (char *)pol;
3170                 struct xfrm_user_sec_ctx *uctx;
3171
3172                 p += pol->sadb_x_policy_len*8;
3173                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3174                 if (len < pol->sadb_x_policy_len*8 +
3175                     sec_ctx->sadb_x_sec_len) {
3176                         *dir = -EINVAL;
3177                         goto out;
3178                 }
3179                 if ((*dir = verify_sec_ctx_len(p)))
3180                         goto out;
3181                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3182                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3183                 kfree(uctx);
3184
3185                 if (*dir)
3186                         goto out;
3187         }
3188
3189         *dir = pol->sadb_x_policy_dir-1;
3190         return xp;
3191
3192 out:
3193         xp->walk.dead = 1;
3194         xfrm_policy_destroy(xp);
3195         return NULL;
3196 }
3197
3198 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3199 {
3200         struct sk_buff *skb;
3201         struct sadb_msg *hdr;
3202         struct sadb_sa *sa;
3203         struct sadb_address *addr;
3204         struct sadb_x_nat_t_port *n_port;
3205         int sockaddr_size;
3206         int size;
3207         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3208         struct xfrm_encap_tmpl *natt = NULL;
3209
3210         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3211         if (!sockaddr_size)
3212                 return -EINVAL;
3213
3214         if (!satype)
3215                 return -EINVAL;
3216
3217         if (!x->encap)
3218                 return -EINVAL;
3219
3220         natt = x->encap;
3221
3222         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3223          *
3224          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3225          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3226          */
3227
3228         size = sizeof(struct sadb_msg) +
3229                 sizeof(struct sadb_sa) +
3230                 (sizeof(struct sadb_address) * 2) +
3231                 (sockaddr_size * 2) +
3232                 (sizeof(struct sadb_x_nat_t_port) * 2);
3233
3234         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3235         if (skb == NULL)
3236                 return -ENOMEM;
3237
3238         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3239         hdr->sadb_msg_version = PF_KEY_V2;
3240         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3241         hdr->sadb_msg_satype = satype;
3242         hdr->sadb_msg_len = size / sizeof(uint64_t);
3243         hdr->sadb_msg_errno = 0;
3244         hdr->sadb_msg_reserved = 0;
3245         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3246         hdr->sadb_msg_pid = 0;
3247
3248         /* SA */
3249         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3250         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3251         sa->sadb_sa_exttype = SADB_EXT_SA;
3252         sa->sadb_sa_spi = x->id.spi;
3253         sa->sadb_sa_replay = 0;
3254         sa->sadb_sa_state = 0;
3255         sa->sadb_sa_auth = 0;
3256         sa->sadb_sa_encrypt = 0;
3257         sa->sadb_sa_flags = 0;
3258
3259         /* ADDRESS_SRC (old addr) */
3260         addr = (struct sadb_address*)
3261                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3262         addr->sadb_address_len =
3263                 (sizeof(struct sadb_address)+sockaddr_size)/
3264                         sizeof(uint64_t);
3265         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3266         addr->sadb_address_proto = 0;
3267         addr->sadb_address_reserved = 0;
3268         addr->sadb_address_prefixlen =
3269                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3270                                     (struct sockaddr *) (addr + 1),
3271                                     x->props.family);
3272         if (!addr->sadb_address_prefixlen)
3273                 BUG();
3274
3275         /* NAT_T_SPORT (old port) */
3276         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3277         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3278         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3279         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3280         n_port->sadb_x_nat_t_port_reserved = 0;
3281
3282         /* ADDRESS_DST (new addr) */
3283         addr = (struct sadb_address*)
3284                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3285         addr->sadb_address_len =
3286                 (sizeof(struct sadb_address)+sockaddr_size)/
3287                         sizeof(uint64_t);
3288         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3289         addr->sadb_address_proto = 0;
3290         addr->sadb_address_reserved = 0;
3291         addr->sadb_address_prefixlen =
3292                 pfkey_sockaddr_fill(ipaddr, 0,
3293                                     (struct sockaddr *) (addr + 1),
3294                                     x->props.family);
3295         if (!addr->sadb_address_prefixlen)
3296                 BUG();
3297
3298         /* NAT_T_DPORT (new port) */
3299         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3300         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3301         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3302         n_port->sadb_x_nat_t_port_port = sport;
3303         n_port->sadb_x_nat_t_port_reserved = 0;
3304
3305         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3306 }
3307
3308 #ifdef CONFIG_NET_KEY_MIGRATE
3309 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3310                             struct xfrm_selector *sel)
3311 {
3312         struct sadb_address *addr;
3313         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3314         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3315         addr->sadb_address_exttype = type;
3316         addr->sadb_address_proto = sel->proto;
3317         addr->sadb_address_reserved = 0;
3318
3319         switch (type) {
3320         case SADB_EXT_ADDRESS_SRC:
3321                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3322                 pfkey_sockaddr_fill(&sel->saddr, 0,
3323                                     (struct sockaddr *)(addr + 1),
3324                                     sel->family);
3325                 break;
3326         case SADB_EXT_ADDRESS_DST:
3327                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3328                 pfkey_sockaddr_fill(&sel->daddr, 0,
3329                                     (struct sockaddr *)(addr + 1),
3330                                     sel->family);
3331                 break;
3332         default:
3333                 return -EINVAL;
3334         }
3335
3336         return 0;
3337 }
3338
3339
3340 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3341 {
3342         struct sadb_x_kmaddress *kma;
3343         u8 *sa;
3344         int family = k->family;
3345         int socklen = pfkey_sockaddr_len(family);
3346         int size_req;
3347
3348         size_req = (sizeof(struct sadb_x_kmaddress) +
3349                     pfkey_sockaddr_pair_size(family));
3350
3351         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3352         memset(kma, 0, size_req);
3353         kma->sadb_x_kmaddress_len = size_req / 8;
3354         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3355         kma->sadb_x_kmaddress_reserved = k->reserved;
3356
3357         sa = (u8 *)(kma + 1);
3358         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3359             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3360                 return -EINVAL;
3361
3362         return 0;
3363 }
3364
3365 static int set_ipsecrequest(struct sk_buff *skb,
3366                             uint8_t proto, uint8_t mode, int level,
3367                             uint32_t reqid, uint8_t family,
3368                             xfrm_address_t *src, xfrm_address_t *dst)
3369 {
3370         struct sadb_x_ipsecrequest *rq;
3371         u8 *sa;
3372         int socklen = pfkey_sockaddr_len(family);
3373         int size_req;
3374
3375         size_req = sizeof(struct sadb_x_ipsecrequest) +
3376                    pfkey_sockaddr_pair_size(family);
3377
3378         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3379         memset(rq, 0, size_req);
3380         rq->sadb_x_ipsecrequest_len = size_req;
3381         rq->sadb_x_ipsecrequest_proto = proto;
3382         rq->sadb_x_ipsecrequest_mode = mode;
3383         rq->sadb_x_ipsecrequest_level = level;
3384         rq->sadb_x_ipsecrequest_reqid = reqid;
3385
3386         sa = (u8 *) (rq + 1);
3387         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3388             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3389                 return -EINVAL;
3390
3391         return 0;
3392 }
3393 #endif
3394
3395 #ifdef CONFIG_NET_KEY_MIGRATE
3396 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3397                               struct xfrm_migrate *m, int num_bundles,
3398                               struct xfrm_kmaddress *k)
3399 {
3400         int i;
3401         int sasize_sel;
3402         int size = 0;
3403         int size_pol = 0;
3404         struct sk_buff *skb;
3405         struct sadb_msg *hdr;
3406         struct sadb_x_policy *pol;
3407         struct xfrm_migrate *mp;
3408
3409         if (type != XFRM_POLICY_TYPE_MAIN)
3410                 return 0;
3411
3412         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3413                 return -EINVAL;
3414
3415         if (k != NULL) {
3416                 /* addresses for KM */
3417                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3418                                      pfkey_sockaddr_pair_size(k->family));
3419         }
3420
3421         /* selector */
3422         sasize_sel = pfkey_sockaddr_size(sel->family);
3423         if (!sasize_sel)
3424                 return -EINVAL;
3425         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3426
3427         /* policy info */
3428         size_pol += sizeof(struct sadb_x_policy);
3429
3430         /* ipsecrequests */
3431         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3432                 /* old locator pair */
3433                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3434                             pfkey_sockaddr_pair_size(mp->old_family);
3435                 /* new locator pair */
3436                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3437                             pfkey_sockaddr_pair_size(mp->new_family);
3438         }
3439
3440         size += sizeof(struct sadb_msg) + size_pol;
3441
3442         /* alloc buffer */
3443         skb = alloc_skb(size, GFP_ATOMIC);
3444         if (skb == NULL)
3445                 return -ENOMEM;
3446
3447         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3448         hdr->sadb_msg_version = PF_KEY_V2;
3449         hdr->sadb_msg_type = SADB_X_MIGRATE;
3450         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3451         hdr->sadb_msg_len = size / 8;
3452         hdr->sadb_msg_errno = 0;
3453         hdr->sadb_msg_reserved = 0;
3454         hdr->sadb_msg_seq = 0;
3455         hdr->sadb_msg_pid = 0;
3456
3457         /* Addresses to be used by KM for negotiation, if ext is available */
3458         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3459                 return -EINVAL;
3460
3461         /* selector src */
3462         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3463
3464         /* selector dst */
3465         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3466
3467         /* policy information */
3468         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3469         pol->sadb_x_policy_len = size_pol / 8;
3470         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3471         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3472         pol->sadb_x_policy_dir = dir + 1;
3473         pol->sadb_x_policy_id = 0;
3474         pol->sadb_x_policy_priority = 0;
3475
3476         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3477                 /* old ipsecrequest */
3478                 int mode = pfkey_mode_from_xfrm(mp->mode);
3479                 if (mode < 0)
3480                         goto err;
3481                 if (set_ipsecrequest(skb, mp->proto, mode,
3482                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3483                                      mp->reqid, mp->old_family,
3484                                      &mp->old_saddr, &mp->old_daddr) < 0)
3485                         goto err;
3486
3487                 /* new ipsecrequest */
3488                 if (set_ipsecrequest(skb, mp->proto, mode,
3489                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3490                                      mp->reqid, mp->new_family,
3491                                      &mp->new_saddr, &mp->new_daddr) < 0)
3492                         goto err;
3493         }
3494
3495         /* broadcast migrate message to sockets */
3496         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3497
3498         return 0;
3499
3500 err:
3501         kfree_skb(skb);
3502         return -EINVAL;
3503 }
3504 #else
3505 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3506                               struct xfrm_migrate *m, int num_bundles,
3507                               struct xfrm_kmaddress *k)
3508 {
3509         return -ENOPROTOOPT;
3510 }
3511 #endif
3512
3513 static int pfkey_sendmsg(struct kiocb *kiocb,
3514                          struct socket *sock, struct msghdr *msg, size_t len)
3515 {
3516         struct sock *sk = sock->sk;
3517         struct sk_buff *skb = NULL;
3518         struct sadb_msg *hdr = NULL;
3519         int err;
3520
3521         err = -EOPNOTSUPP;
3522         if (msg->msg_flags & MSG_OOB)
3523                 goto out;
3524
3525         err = -EMSGSIZE;
3526         if ((unsigned)len > sk->sk_sndbuf - 32)
3527                 goto out;
3528
3529         err = -ENOBUFS;
3530         skb = alloc_skb(len, GFP_KERNEL);
3531         if (skb == NULL)
3532                 goto out;
3533
3534         err = -EFAULT;
3535         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3536                 goto out;
3537
3538         hdr = pfkey_get_base_msg(skb, &err);
3539         if (!hdr)
3540                 goto out;
3541
3542         mutex_lock(&xfrm_cfg_mutex);
3543         err = pfkey_process(sk, skb, hdr);
3544         mutex_unlock(&xfrm_cfg_mutex);
3545
3546 out:
3547         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3548                 err = 0;
3549         if (skb)
3550                 kfree_skb(skb);
3551
3552         return err ? : len;
3553 }
3554
3555 static int pfkey_recvmsg(struct kiocb *kiocb,
3556                          struct socket *sock, struct msghdr *msg, size_t len,
3557                          int flags)
3558 {
3559         struct sock *sk = sock->sk;
3560         struct pfkey_sock *pfk = pfkey_sk(sk);
3561         struct sk_buff *skb;
3562         int copied, err;
3563
3564         err = -EINVAL;
3565         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3566                 goto out;
3567
3568         msg->msg_namelen = 0;
3569         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3570         if (skb == NULL)
3571                 goto out;
3572
3573         copied = skb->len;
3574         if (copied > len) {
3575                 msg->msg_flags |= MSG_TRUNC;
3576                 copied = len;
3577         }
3578
3579         skb_reset_transport_header(skb);
3580         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3581         if (err)
3582                 goto out_free;
3583
3584         sock_recv_timestamp(msg, sk, skb);
3585
3586         err = (flags & MSG_TRUNC) ? skb->len : copied;
3587
3588         if (pfk->dump.dump != NULL &&
3589             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3590                 pfkey_do_dump(pfk);
3591
3592 out_free:
3593         skb_free_datagram(sk, skb);
3594 out:
3595         return err;
3596 }
3597
3598 static const struct proto_ops pfkey_ops = {
3599         .family         =       PF_KEY,
3600         .owner          =       THIS_MODULE,
3601         /* Operations that make no sense on pfkey sockets. */
3602         .bind           =       sock_no_bind,
3603         .connect        =       sock_no_connect,
3604         .socketpair     =       sock_no_socketpair,
3605         .accept         =       sock_no_accept,
3606         .getname        =       sock_no_getname,
3607         .ioctl          =       sock_no_ioctl,
3608         .listen         =       sock_no_listen,
3609         .shutdown       =       sock_no_shutdown,
3610         .setsockopt     =       sock_no_setsockopt,
3611         .getsockopt     =       sock_no_getsockopt,
3612         .mmap           =       sock_no_mmap,
3613         .sendpage       =       sock_no_sendpage,
3614
3615         /* Now the operations that really occur. */
3616         .release        =       pfkey_release,
3617         .poll           =       datagram_poll,
3618         .sendmsg        =       pfkey_sendmsg,
3619         .recvmsg        =       pfkey_recvmsg,
3620 };
3621
3622 static struct net_proto_family pfkey_family_ops = {
3623         .family =       PF_KEY,
3624         .create =       pfkey_create,
3625         .owner  =       THIS_MODULE,
3626 };
3627
3628 #ifdef CONFIG_PROC_FS
3629 static int pfkey_seq_show(struct seq_file *f, void *v)
3630 {
3631         struct sock *s;
3632
3633         s = (struct sock *)v;
3634         if (v == SEQ_START_TOKEN)
3635                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3636         else
3637                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3638                                s,
3639                                atomic_read(&s->sk_refcnt),
3640                                atomic_read(&s->sk_rmem_alloc),
3641                                atomic_read(&s->sk_wmem_alloc),
3642                                sock_i_uid(s),
3643                                sock_i_ino(s)
3644                                );
3645         return 0;
3646 }
3647
3648 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3649 {
3650         struct sock *s;
3651         struct hlist_node *node;
3652         loff_t pos = *ppos;
3653
3654         read_lock(&pfkey_table_lock);
3655         if (pos == 0)
3656                 return SEQ_START_TOKEN;
3657
3658         sk_for_each(s, node, &pfkey_table)
3659                 if (pos-- == 1)
3660                         return s;
3661
3662         return NULL;
3663 }
3664
3665 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3666 {
3667         ++*ppos;
3668         return (v == SEQ_START_TOKEN) ?
3669                 sk_head(&pfkey_table) :
3670                         sk_next((struct sock *)v);
3671 }
3672
3673 static void pfkey_seq_stop(struct seq_file *f, void *v)
3674 {
3675         read_unlock(&pfkey_table_lock);
3676 }
3677
3678 static struct seq_operations pfkey_seq_ops = {
3679         .start  = pfkey_seq_start,
3680         .next   = pfkey_seq_next,
3681         .stop   = pfkey_seq_stop,
3682         .show   = pfkey_seq_show,
3683 };
3684
3685 static int pfkey_seq_open(struct inode *inode, struct file *file)
3686 {
3687         return seq_open(file, &pfkey_seq_ops);
3688 }
3689
3690 static struct file_operations pfkey_proc_ops = {
3691         .open    = pfkey_seq_open,
3692         .read    = seq_read,
3693         .llseek  = seq_lseek,
3694         .release = seq_release,
3695 };
3696
3697 static int pfkey_init_proc(void)
3698 {
3699         struct proc_dir_entry *e;
3700
3701         e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3702         if (e == NULL)
3703                 return -ENOMEM;
3704
3705         return 0;
3706 }
3707
3708 static void pfkey_exit_proc(void)
3709 {
3710         proc_net_remove(&init_net, "pfkey");
3711 }
3712 #else
3713 static inline int pfkey_init_proc(void)
3714 {
3715         return 0;
3716 }
3717
3718 static inline void pfkey_exit_proc(void)
3719 {
3720 }
3721 #endif
3722
3723 static struct xfrm_mgr pfkeyv2_mgr =
3724 {
3725         .id             = "pfkeyv2",
3726         .notify         = pfkey_send_notify,
3727         .acquire        = pfkey_send_acquire,
3728         .compile_policy = pfkey_compile_policy,
3729         .new_mapping    = pfkey_send_new_mapping,
3730         .notify_policy  = pfkey_send_policy_notify,
3731         .migrate        = pfkey_send_migrate,
3732 };
3733
3734 static void __exit ipsec_pfkey_exit(void)
3735 {
3736         xfrm_unregister_km(&pfkeyv2_mgr);
3737         pfkey_exit_proc();
3738         sock_unregister(PF_KEY);
3739         proto_unregister(&key_proto);
3740 }
3741
3742 static int __init ipsec_pfkey_init(void)
3743 {
3744         int err = proto_register(&key_proto, 0);
3745
3746         if (err != 0)
3747                 goto out;
3748
3749         err = sock_register(&pfkey_family_ops);
3750         if (err != 0)
3751                 goto out_unregister_key_proto;
3752         err = pfkey_init_proc();
3753         if (err != 0)
3754                 goto out_sock_unregister;
3755         err = xfrm_register_km(&pfkeyv2_mgr);
3756         if (err != 0)
3757                 goto out_remove_proc_entry;
3758 out:
3759         return err;
3760 out_remove_proc_entry:
3761         pfkey_exit_proc();
3762 out_sock_unregister:
3763         sock_unregister(PF_KEY);
3764 out_unregister_key_proto:
3765         proto_unregister(&key_proto);
3766         goto out;
3767 }
3768
3769 module_init(ipsec_pfkey_init);
3770 module_exit(ipsec_pfkey_exit);
3771 MODULE_LICENSE("GPL");
3772 MODULE_ALIAS_NETPROTO(PF_KEY);