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   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         km_state_notify(NULL, &c);
1743
1744         return 0;
1745 }
1746
1747 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1748 {
1749         struct pfkey_sock *pfk = ptr;
1750         struct sk_buff *out_skb;
1751         struct sadb_msg *out_hdr;
1752
1753         if (!pfkey_can_dump(&pfk->sk))
1754                 return -ENOBUFS;
1755
1756         out_skb = pfkey_xfrm_state2msg(x);
1757         if (IS_ERR(out_skb))
1758                 return PTR_ERR(out_skb);
1759
1760         out_hdr = (struct sadb_msg *) out_skb->data;
1761         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1762         out_hdr->sadb_msg_type = SADB_DUMP;
1763         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1764         out_hdr->sadb_msg_errno = 0;
1765         out_hdr->sadb_msg_reserved = 0;
1766         out_hdr->sadb_msg_seq = count + 1;
1767         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1768
1769         if (pfk->dump.skb)
1770                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1771                                 &pfk->sk);
1772         pfk->dump.skb = out_skb;
1773
1774         return 0;
1775 }
1776
1777 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1778 {
1779         return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
1780 }
1781
1782 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1783 {
1784         xfrm_state_walk_done(&pfk->dump.u.state);
1785 }
1786
1787 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1788 {
1789         u8 proto;
1790         struct pfkey_sock *pfk = pfkey_sk(sk);
1791
1792         if (pfk->dump.dump != NULL)
1793                 return -EBUSY;
1794
1795         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1796         if (proto == 0)
1797                 return -EINVAL;
1798
1799         pfk->dump.msg_version = hdr->sadb_msg_version;
1800         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1801         pfk->dump.dump = pfkey_dump_sa;
1802         pfk->dump.done = pfkey_dump_sa_done;
1803         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1804
1805         return pfkey_do_dump(pfk);
1806 }
1807
1808 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1809 {
1810         struct pfkey_sock *pfk = pfkey_sk(sk);
1811         int satype = hdr->sadb_msg_satype;
1812
1813         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1814                 /* XXX we mangle packet... */
1815                 hdr->sadb_msg_errno = 0;
1816                 if (satype != 0 && satype != 1)
1817                         return -EINVAL;
1818                 pfk->promisc = satype;
1819         }
1820         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1821         return 0;
1822 }
1823
1824 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1825 {
1826         int i;
1827         u32 reqid = *(u32*)ptr;
1828
1829         for (i=0; i<xp->xfrm_nr; i++) {
1830                 if (xp->xfrm_vec[i].reqid == reqid)
1831                         return -EEXIST;
1832         }
1833         return 0;
1834 }
1835
1836 static u32 gen_reqid(void)
1837 {
1838         struct xfrm_policy_walk walk;
1839         u32 start;
1840         int rc;
1841         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1842
1843         start = reqid;
1844         do {
1845                 ++reqid;
1846                 if (reqid == 0)
1847                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1848                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1849                 rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
1850                 xfrm_policy_walk_done(&walk);
1851                 if (rc != -EEXIST)
1852                         return reqid;
1853         } while (reqid != start);
1854         return 0;
1855 }
1856
1857 static int
1858 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1859 {
1860         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1861         int mode;
1862
1863         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1864                 return -ELOOP;
1865
1866         if (rq->sadb_x_ipsecrequest_mode == 0)
1867                 return -EINVAL;
1868
1869         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1870         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1871                 return -EINVAL;
1872         t->mode = mode;
1873         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1874                 t->optional = 1;
1875         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1876                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1877                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1878                         t->reqid = 0;
1879                 if (!t->reqid && !(t->reqid = gen_reqid()))
1880                         return -ENOBUFS;
1881         }
1882
1883         /* addresses present only in tunnel mode */
1884         if (t->mode == XFRM_MODE_TUNNEL) {
1885                 u8 *sa = (u8 *) (rq + 1);
1886                 int family, socklen;
1887
1888                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1889                                                 &t->saddr);
1890                 if (!family)
1891                         return -EINVAL;
1892
1893                 socklen = pfkey_sockaddr_len(family);
1894                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1895                                            &t->id.daddr) != family)
1896                         return -EINVAL;
1897                 t->encap_family = family;
1898         } else
1899                 t->encap_family = xp->family;
1900
1901         /* No way to set this via kame pfkey */
1902         t->allalgs = 1;
1903         xp->xfrm_nr++;
1904         return 0;
1905 }
1906
1907 static int
1908 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1909 {
1910         int err;
1911         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1912         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1913
1914         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1915                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1916                         return err;
1917                 len -= rq->sadb_x_ipsecrequest_len;
1918                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1919         }
1920         return 0;
1921 }
1922
1923 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1924 {
1925   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1926
1927         if (xfrm_ctx) {
1928                 int len = sizeof(struct sadb_x_sec_ctx);
1929                 len += xfrm_ctx->ctx_len;
1930                 return PFKEY_ALIGN8(len);
1931         }
1932         return 0;
1933 }
1934
1935 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1936 {
1937         struct xfrm_tmpl *t;
1938         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1939         int socklen = 0;
1940         int i;
1941
1942         for (i=0; i<xp->xfrm_nr; i++) {
1943                 t = xp->xfrm_vec + i;
1944                 socklen += pfkey_sockaddr_len(t->encap_family);
1945         }
1946
1947         return sizeof(struct sadb_msg) +
1948                 (sizeof(struct sadb_lifetime) * 3) +
1949                 (sizeof(struct sadb_address) * 2) +
1950                 (sockaddr_size * 2) +
1951                 sizeof(struct sadb_x_policy) +
1952                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1953                 (socklen * 2) +
1954                 pfkey_xfrm_policy2sec_ctx_size(xp);
1955 }
1956
1957 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1958 {
1959         struct sk_buff *skb;
1960         int size;
1961
1962         size = pfkey_xfrm_policy2msg_size(xp);
1963
1964         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1965         if (skb == NULL)
1966                 return ERR_PTR(-ENOBUFS);
1967
1968         return skb;
1969 }
1970
1971 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1972 {
1973         struct sadb_msg *hdr;
1974         struct sadb_address *addr;
1975         struct sadb_lifetime *lifetime;
1976         struct sadb_x_policy *pol;
1977         struct sadb_x_sec_ctx *sec_ctx;
1978         struct xfrm_sec_ctx *xfrm_ctx;
1979         int i;
1980         int size;
1981         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1982         int socklen = pfkey_sockaddr_len(xp->family);
1983
1984         size = pfkey_xfrm_policy2msg_size(xp);
1985
1986         /* call should fill header later */
1987         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1988         memset(hdr, 0, size);   /* XXX do we need this ? */
1989
1990         /* src address */
1991         addr = (struct sadb_address*) skb_put(skb,
1992                                               sizeof(struct sadb_address)+sockaddr_size);
1993         addr->sadb_address_len =
1994                 (sizeof(struct sadb_address)+sockaddr_size)/
1995                         sizeof(uint64_t);
1996         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1997         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1998         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1999         addr->sadb_address_reserved = 0;
2000         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2001                                  xp->selector.sport,
2002                                  (struct sockaddr *) (addr + 1),
2003                                  xp->family))
2004                 BUG();
2005
2006         /* dst address */
2007         addr = (struct sadb_address*) skb_put(skb,
2008                                               sizeof(struct sadb_address)+sockaddr_size);
2009         addr->sadb_address_len =
2010                 (sizeof(struct sadb_address)+sockaddr_size)/
2011                         sizeof(uint64_t);
2012         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2013         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2014         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2015         addr->sadb_address_reserved = 0;
2016
2017         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2018                             (struct sockaddr *) (addr + 1),
2019                             xp->family);
2020
2021         /* hard time */
2022         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2023                                                      sizeof(struct sadb_lifetime));
2024         lifetime->sadb_lifetime_len =
2025                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2026         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2027         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2028         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2029         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2030         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2031         /* soft time */
2032         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2033                                                      sizeof(struct sadb_lifetime));
2034         lifetime->sadb_lifetime_len =
2035                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2036         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2037         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2038         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2039         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2040         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2041         /* current time */
2042         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2043                                                      sizeof(struct sadb_lifetime));
2044         lifetime->sadb_lifetime_len =
2045                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2046         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2047         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2048         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2049         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2050         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2051
2052         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2053         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2054         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2055         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2056         if (xp->action == XFRM_POLICY_ALLOW) {
2057                 if (xp->xfrm_nr)
2058                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2059                 else
2060                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2061         }
2062         pol->sadb_x_policy_dir = dir+1;
2063         pol->sadb_x_policy_id = xp->index;
2064         pol->sadb_x_policy_priority = xp->priority;
2065
2066         for (i=0; i<xp->xfrm_nr; i++) {
2067                 struct sadb_x_ipsecrequest *rq;
2068                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2069                 int req_size;
2070                 int mode;
2071
2072                 req_size = sizeof(struct sadb_x_ipsecrequest);
2073                 if (t->mode == XFRM_MODE_TUNNEL) {
2074                         socklen = pfkey_sockaddr_len(t->encap_family);
2075                         req_size += socklen * 2;
2076                 } else {
2077                         size -= 2*socklen;
2078                 }
2079                 rq = (void*)skb_put(skb, req_size);
2080                 pol->sadb_x_policy_len += req_size/8;
2081                 memset(rq, 0, sizeof(*rq));
2082                 rq->sadb_x_ipsecrequest_len = req_size;
2083                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2084                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2085                         return -EINVAL;
2086                 rq->sadb_x_ipsecrequest_mode = mode;
2087                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2088                 if (t->reqid)
2089                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2090                 if (t->optional)
2091                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2092                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2093
2094                 if (t->mode == XFRM_MODE_TUNNEL) {
2095                         u8 *sa = (void *)(rq + 1);
2096                         pfkey_sockaddr_fill(&t->saddr, 0,
2097                                             (struct sockaddr *)sa,
2098                                             t->encap_family);
2099                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2100                                             (struct sockaddr *) (sa + socklen),
2101                                             t->encap_family);
2102                 }
2103         }
2104
2105         /* security context */
2106         if ((xfrm_ctx = xp->security)) {
2107                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2108
2109                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2110                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2111                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2112                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2113                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2114                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2115                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2116                        xfrm_ctx->ctx_len);
2117         }
2118
2119         hdr->sadb_msg_len = size / sizeof(uint64_t);
2120         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2121
2122         return 0;
2123 }
2124
2125 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2126 {
2127         struct sk_buff *out_skb;
2128         struct sadb_msg *out_hdr;
2129         int err;
2130
2131         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2132         if (IS_ERR(out_skb)) {
2133                 err = PTR_ERR(out_skb);
2134                 goto out;
2135         }
2136         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2137         if (err < 0)
2138                 return err;
2139
2140         out_hdr = (struct sadb_msg *) out_skb->data;
2141         out_hdr->sadb_msg_version = PF_KEY_V2;
2142
2143         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2144                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2145         else
2146                 out_hdr->sadb_msg_type = event2poltype(c->event);
2147         out_hdr->sadb_msg_errno = 0;
2148         out_hdr->sadb_msg_seq = c->seq;
2149         out_hdr->sadb_msg_pid = c->pid;
2150         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2151 out:
2152         return 0;
2153
2154 }
2155
2156 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2157 {
2158         int err = 0;
2159         struct sadb_lifetime *lifetime;
2160         struct sadb_address *sa;
2161         struct sadb_x_policy *pol;
2162         struct xfrm_policy *xp;
2163         struct km_event c;
2164         struct sadb_x_sec_ctx *sec_ctx;
2165
2166         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2167                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2168             !ext_hdrs[SADB_X_EXT_POLICY-1])
2169                 return -EINVAL;
2170
2171         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2172         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2173                 return -EINVAL;
2174         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2175                 return -EINVAL;
2176
2177         xp = xfrm_policy_alloc(&init_net, GFP_KERNEL);
2178         if (xp == NULL)
2179                 return -ENOBUFS;
2180
2181         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2182                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2183         xp->priority = pol->sadb_x_policy_priority;
2184
2185         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2186         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2187         if (!xp->family) {
2188                 err = -EINVAL;
2189                 goto out;
2190         }
2191         xp->selector.family = xp->family;
2192         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2193         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2194         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2195         if (xp->selector.sport)
2196                 xp->selector.sport_mask = htons(0xffff);
2197
2198         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2199         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2200         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2201
2202         /* Amusing, we set this twice.  KAME apps appear to set same value
2203          * in both addresses.
2204          */
2205         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2206
2207         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2208         if (xp->selector.dport)
2209                 xp->selector.dport_mask = htons(0xffff);
2210
2211         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2212         if (sec_ctx != NULL) {
2213                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2214
2215                 if (!uctx) {
2216                         err = -ENOBUFS;
2217                         goto out;
2218                 }
2219
2220                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2221                 kfree(uctx);
2222
2223                 if (err)
2224                         goto out;
2225         }
2226
2227         xp->lft.soft_byte_limit = XFRM_INF;
2228         xp->lft.hard_byte_limit = XFRM_INF;
2229         xp->lft.soft_packet_limit = XFRM_INF;
2230         xp->lft.hard_packet_limit = XFRM_INF;
2231         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2232                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2233                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2234                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2235                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2236         }
2237         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2238                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2239                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2240                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2241                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2242         }
2243         xp->xfrm_nr = 0;
2244         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2245             (err = parse_ipsecrequests(xp, pol)) < 0)
2246                 goto out;
2247
2248         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2249                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2250
2251         xfrm_audit_policy_add(xp, err ? 0 : 1,
2252                               audit_get_loginuid(current),
2253                               audit_get_sessionid(current), 0);
2254
2255         if (err)
2256                 goto out;
2257
2258         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2259                 c.event = XFRM_MSG_UPDPOLICY;
2260         else
2261                 c.event = XFRM_MSG_NEWPOLICY;
2262
2263         c.seq = hdr->sadb_msg_seq;
2264         c.pid = hdr->sadb_msg_pid;
2265
2266         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2267         xfrm_pol_put(xp);
2268         return 0;
2269
2270 out:
2271         xp->walk.dead = 1;
2272         xfrm_policy_destroy(xp);
2273         return err;
2274 }
2275
2276 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2277 {
2278         int err;
2279         struct sadb_address *sa;
2280         struct sadb_x_policy *pol;
2281         struct xfrm_policy *xp;
2282         struct xfrm_selector sel;
2283         struct km_event c;
2284         struct sadb_x_sec_ctx *sec_ctx;
2285         struct xfrm_sec_ctx *pol_ctx = NULL;
2286
2287         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2288                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2289             !ext_hdrs[SADB_X_EXT_POLICY-1])
2290                 return -EINVAL;
2291
2292         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2293         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2294                 return -EINVAL;
2295
2296         memset(&sel, 0, sizeof(sel));
2297
2298         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2299         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2300         sel.prefixlen_s = sa->sadb_address_prefixlen;
2301         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2302         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2303         if (sel.sport)
2304                 sel.sport_mask = htons(0xffff);
2305
2306         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2307         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2308         sel.prefixlen_d = sa->sadb_address_prefixlen;
2309         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2310         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2311         if (sel.dport)
2312                 sel.dport_mask = htons(0xffff);
2313
2314         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2315         if (sec_ctx != NULL) {
2316                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2317
2318                 if (!uctx)
2319                         return -ENOMEM;
2320
2321                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2322                 kfree(uctx);
2323                 if (err)
2324                         return err;
2325         }
2326
2327         xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN,
2328                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2329                                    1, &err);
2330         security_xfrm_policy_free(pol_ctx);
2331         if (xp == NULL)
2332                 return -ENOENT;
2333
2334         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2335                                  audit_get_loginuid(current),
2336                                  audit_get_sessionid(current), 0);
2337
2338         if (err)
2339                 goto out;
2340
2341         c.seq = hdr->sadb_msg_seq;
2342         c.pid = hdr->sadb_msg_pid;
2343         c.data.byid = 0;
2344         c.event = XFRM_MSG_DELPOLICY;
2345         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2346
2347 out:
2348         xfrm_pol_put(xp);
2349         return err;
2350 }
2351
2352 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2353 {
2354         int err;
2355         struct sk_buff *out_skb;
2356         struct sadb_msg *out_hdr;
2357         err = 0;
2358
2359         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2360         if (IS_ERR(out_skb)) {
2361                 err =  PTR_ERR(out_skb);
2362                 goto out;
2363         }
2364         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2365         if (err < 0)
2366                 goto out;
2367
2368         out_hdr = (struct sadb_msg *) out_skb->data;
2369         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2370         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2371         out_hdr->sadb_msg_satype = 0;
2372         out_hdr->sadb_msg_errno = 0;
2373         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2374         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2375         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2376         err = 0;
2377
2378 out:
2379         return err;
2380 }
2381
2382 #ifdef CONFIG_NET_KEY_MIGRATE
2383 static int pfkey_sockaddr_pair_size(sa_family_t family)
2384 {
2385         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2386 }
2387
2388 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2389                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2390                                u16 *family)
2391 {
2392         int af, socklen;
2393
2394         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2395                 return -EINVAL;
2396
2397         af = pfkey_sockaddr_extract(sa, saddr);
2398         if (!af)
2399                 return -EINVAL;
2400
2401         socklen = pfkey_sockaddr_len(af);
2402         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2403                                    daddr) != af)
2404                 return -EINVAL;
2405
2406         *family = af;
2407         return 0;
2408 }
2409
2410 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2411                                     struct xfrm_migrate *m)
2412 {
2413         int err;
2414         struct sadb_x_ipsecrequest *rq2;
2415         int mode;
2416
2417         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2418             len < rq1->sadb_x_ipsecrequest_len)
2419                 return -EINVAL;
2420
2421         /* old endoints */
2422         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2423                                   rq1->sadb_x_ipsecrequest_len,
2424                                   &m->old_saddr, &m->old_daddr,
2425                                   &m->old_family);
2426         if (err)
2427                 return err;
2428
2429         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2430         len -= rq1->sadb_x_ipsecrequest_len;
2431
2432         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2433             len < rq2->sadb_x_ipsecrequest_len)
2434                 return -EINVAL;
2435
2436         /* new endpoints */
2437         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2438                                   rq2->sadb_x_ipsecrequest_len,
2439                                   &m->new_saddr, &m->new_daddr,
2440                                   &m->new_family);
2441         if (err)
2442                 return err;
2443
2444         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2445             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2446             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2447                 return -EINVAL;
2448
2449         m->proto = rq1->sadb_x_ipsecrequest_proto;
2450         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2451                 return -EINVAL;
2452         m->mode = mode;
2453         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2454
2455         return ((int)(rq1->sadb_x_ipsecrequest_len +
2456                       rq2->sadb_x_ipsecrequest_len));
2457 }
2458
2459 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2460                          struct sadb_msg *hdr, void **ext_hdrs)
2461 {
2462         int i, len, ret, err = -EINVAL;
2463         u8 dir;
2464         struct sadb_address *sa;
2465         struct sadb_x_kmaddress *kma;
2466         struct sadb_x_policy *pol;
2467         struct sadb_x_ipsecrequest *rq;
2468         struct xfrm_selector sel;
2469         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2470         struct xfrm_kmaddress k;
2471
2472         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2473                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2474             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2475                 err = -EINVAL;
2476                 goto out;
2477         }
2478
2479         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2480         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2481
2482         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2483                 err = -EINVAL;
2484                 goto out;
2485         }
2486
2487         if (kma) {
2488                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2489                 k.reserved = kma->sadb_x_kmaddress_reserved;
2490                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2491                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2492                                           &k.local, &k.remote, &k.family);
2493                 if (ret < 0) {
2494                         err = ret;
2495                         goto out;
2496                 }
2497         }
2498
2499         dir = pol->sadb_x_policy_dir - 1;
2500         memset(&sel, 0, sizeof(sel));
2501
2502         /* set source address info of selector */
2503         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2504         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2505         sel.prefixlen_s = sa->sadb_address_prefixlen;
2506         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2507         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2508         if (sel.sport)
2509                 sel.sport_mask = htons(0xffff);
2510
2511         /* set destination address info of selector */
2512         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2513         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2514         sel.prefixlen_d = sa->sadb_address_prefixlen;
2515         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2516         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2517         if (sel.dport)
2518                 sel.dport_mask = htons(0xffff);
2519
2520         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2521
2522         /* extract ipsecrequests */
2523         i = 0;
2524         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2525
2526         while (len > 0 && i < XFRM_MAX_DEPTH) {
2527                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2528                 if (ret < 0) {
2529                         err = ret;
2530                         goto out;
2531                 } else {
2532                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2533                         len -= ret;
2534                         i++;
2535                 }
2536         }
2537
2538         if (!i || len > 0) {
2539                 err = -EINVAL;
2540                 goto out;
2541         }
2542
2543         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2544                             kma ? &k : NULL);
2545
2546  out:
2547         return err;
2548 }
2549 #else
2550 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2551                          struct sadb_msg *hdr, void **ext_hdrs)
2552 {
2553         return -ENOPROTOOPT;
2554 }
2555 #endif
2556
2557
2558 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2559 {
2560         unsigned int dir;
2561         int err = 0, delete;
2562         struct sadb_x_policy *pol;
2563         struct xfrm_policy *xp;
2564         struct km_event c;
2565
2566         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2567                 return -EINVAL;
2568
2569         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2570         if (dir >= XFRM_POLICY_MAX)
2571                 return -EINVAL;
2572
2573         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2574         xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2575                               delete, &err);
2576         if (xp == NULL)
2577                 return -ENOENT;
2578
2579         if (delete) {
2580                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2581                                 audit_get_loginuid(current),
2582                                 audit_get_sessionid(current), 0);
2583
2584                 if (err)
2585                         goto out;
2586                 c.seq = hdr->sadb_msg_seq;
2587                 c.pid = hdr->sadb_msg_pid;
2588                 c.data.byid = 1;
2589                 c.event = XFRM_MSG_DELPOLICY;
2590                 km_policy_notify(xp, dir, &c);
2591         } else {
2592                 err = key_pol_get_resp(sk, xp, hdr, dir);
2593         }
2594
2595 out:
2596         xfrm_pol_put(xp);
2597         return err;
2598 }
2599
2600 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2601 {
2602         struct pfkey_sock *pfk = ptr;
2603         struct sk_buff *out_skb;
2604         struct sadb_msg *out_hdr;
2605         int err;
2606
2607         if (!pfkey_can_dump(&pfk->sk))
2608                 return -ENOBUFS;
2609
2610         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2611         if (IS_ERR(out_skb))
2612                 return PTR_ERR(out_skb);
2613
2614         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2615         if (err < 0)
2616                 return err;
2617
2618         out_hdr = (struct sadb_msg *) out_skb->data;
2619         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2620         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2621         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2622         out_hdr->sadb_msg_errno = 0;
2623         out_hdr->sadb_msg_seq = count + 1;
2624         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2625
2626         if (pfk->dump.skb)
2627                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2628                                 &pfk->sk);
2629         pfk->dump.skb = out_skb;
2630
2631         return 0;
2632 }
2633
2634 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2635 {
2636         return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
2637 }
2638
2639 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2640 {
2641         xfrm_policy_walk_done(&pfk->dump.u.policy);
2642 }
2643
2644 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2645 {
2646         struct pfkey_sock *pfk = pfkey_sk(sk);
2647
2648         if (pfk->dump.dump != NULL)
2649                 return -EBUSY;
2650
2651         pfk->dump.msg_version = hdr->sadb_msg_version;
2652         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2653         pfk->dump.dump = pfkey_dump_sp;
2654         pfk->dump.done = pfkey_dump_sp_done;
2655         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2656
2657         return pfkey_do_dump(pfk);
2658 }
2659
2660 static int key_notify_policy_flush(struct km_event *c)
2661 {
2662         struct sk_buff *skb_out;
2663         struct sadb_msg *hdr;
2664
2665         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2666         if (!skb_out)
2667                 return -ENOBUFS;
2668         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2669         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2670         hdr->sadb_msg_seq = c->seq;
2671         hdr->sadb_msg_pid = c->pid;
2672         hdr->sadb_msg_version = PF_KEY_V2;
2673         hdr->sadb_msg_errno = (uint8_t) 0;
2674         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2675         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2676         return 0;
2677
2678 }
2679
2680 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2681 {
2682         struct km_event c;
2683         struct xfrm_audit audit_info;
2684         int err;
2685
2686         audit_info.loginuid = audit_get_loginuid(current);
2687         audit_info.sessionid = audit_get_sessionid(current);
2688         audit_info.secid = 0;
2689         err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
2690         if (err)
2691                 return err;
2692         c.data.type = XFRM_POLICY_TYPE_MAIN;
2693         c.event = XFRM_MSG_FLUSHPOLICY;
2694         c.pid = hdr->sadb_msg_pid;
2695         c.seq = hdr->sadb_msg_seq;
2696         km_policy_notify(NULL, 0, &c);
2697
2698         return 0;
2699 }
2700
2701 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2702                              struct sadb_msg *hdr, void **ext_hdrs);
2703 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2704         [SADB_RESERVED]         = pfkey_reserved,
2705         [SADB_GETSPI]           = pfkey_getspi,
2706         [SADB_UPDATE]           = pfkey_add,
2707         [SADB_ADD]              = pfkey_add,
2708         [SADB_DELETE]           = pfkey_delete,
2709         [SADB_GET]              = pfkey_get,
2710         [SADB_ACQUIRE]          = pfkey_acquire,
2711         [SADB_REGISTER]         = pfkey_register,
2712         [SADB_EXPIRE]           = NULL,
2713         [SADB_FLUSH]            = pfkey_flush,
2714         [SADB_DUMP]             = pfkey_dump,
2715         [SADB_X_PROMISC]        = pfkey_promisc,
2716         [SADB_X_PCHANGE]        = NULL,
2717         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2718         [SADB_X_SPDADD]         = pfkey_spdadd,
2719         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2720         [SADB_X_SPDGET]         = pfkey_spdget,
2721         [SADB_X_SPDACQUIRE]     = NULL,
2722         [SADB_X_SPDDUMP]        = pfkey_spddump,
2723         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2724         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2725         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2726         [SADB_X_MIGRATE]        = pfkey_migrate,
2727 };
2728
2729 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2730 {
2731         void *ext_hdrs[SADB_EXT_MAX];
2732         int err;
2733
2734         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2735                         BROADCAST_PROMISC_ONLY, NULL);
2736
2737         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2738         err = parse_exthdrs(skb, hdr, ext_hdrs);
2739         if (!err) {
2740                 err = -EOPNOTSUPP;
2741                 if (pfkey_funcs[hdr->sadb_msg_type])
2742                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2743         }
2744         return err;
2745 }
2746
2747 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2748 {
2749         struct sadb_msg *hdr = NULL;
2750
2751         if (skb->len < sizeof(*hdr)) {
2752                 *errp = -EMSGSIZE;
2753         } else {
2754                 hdr = (struct sadb_msg *) skb->data;
2755                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2756                     hdr->sadb_msg_reserved != 0 ||
2757                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2758                      hdr->sadb_msg_type > SADB_MAX)) {
2759                         hdr = NULL;
2760                         *errp = -EINVAL;
2761                 } else if (hdr->sadb_msg_len != (skb->len /
2762                                                  sizeof(uint64_t)) ||
2763                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2764                                                 sizeof(uint64_t))) {
2765                         hdr = NULL;
2766                         *errp = -EMSGSIZE;
2767                 } else {
2768                         *errp = 0;
2769                 }
2770         }
2771         return hdr;
2772 }
2773
2774 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2775 {
2776         unsigned int id = d->desc.sadb_alg_id;
2777
2778         if (id >= sizeof(t->aalgos) * 8)
2779                 return 0;
2780
2781         return (t->aalgos >> id) & 1;
2782 }
2783
2784 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2785 {
2786         unsigned int id = d->desc.sadb_alg_id;
2787
2788         if (id >= sizeof(t->ealgos) * 8)
2789                 return 0;
2790
2791         return (t->ealgos >> id) & 1;
2792 }
2793
2794 static int count_ah_combs(struct xfrm_tmpl *t)
2795 {
2796         int i, sz = 0;
2797
2798         for (i = 0; ; i++) {
2799                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2800                 if (!aalg)
2801                         break;
2802                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2803                         sz += sizeof(struct sadb_comb);
2804         }
2805         return sz + sizeof(struct sadb_prop);
2806 }
2807
2808 static int count_esp_combs(struct xfrm_tmpl *t)
2809 {
2810         int i, k, sz = 0;
2811
2812         for (i = 0; ; i++) {
2813                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2814                 if (!ealg)
2815                         break;
2816
2817                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2818                         continue;
2819
2820                 for (k = 1; ; k++) {
2821                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2822                         if (!aalg)
2823                                 break;
2824
2825                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2826                                 sz += sizeof(struct sadb_comb);
2827                 }
2828         }
2829         return sz + sizeof(struct sadb_prop);
2830 }
2831
2832 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2833 {
2834         struct sadb_prop *p;
2835         int i;
2836
2837         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2838         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2839         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2840         p->sadb_prop_replay = 32;
2841         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2842
2843         for (i = 0; ; i++) {
2844                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2845                 if (!aalg)
2846                         break;
2847
2848                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2849                         struct sadb_comb *c;
2850                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2851                         memset(c, 0, sizeof(*c));
2852                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2853                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2854                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2855                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2856                         c->sadb_comb_hard_addtime = 24*60*60;
2857                         c->sadb_comb_soft_addtime = 20*60*60;
2858                         c->sadb_comb_hard_usetime = 8*60*60;
2859                         c->sadb_comb_soft_usetime = 7*60*60;
2860                 }
2861         }
2862 }
2863
2864 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2865 {
2866         struct sadb_prop *p;
2867         int i, k;
2868
2869         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2870         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2871         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2872         p->sadb_prop_replay = 32;
2873         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2874
2875         for (i=0; ; i++) {
2876                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2877                 if (!ealg)
2878                         break;
2879
2880                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2881                         continue;
2882
2883                 for (k = 1; ; k++) {
2884                         struct sadb_comb *c;
2885                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2886                         if (!aalg)
2887                                 break;
2888                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2889                                 continue;
2890                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2891                         memset(c, 0, sizeof(*c));
2892                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2893                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2894                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2895                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2896                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2897                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2898                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2899                         c->sadb_comb_hard_addtime = 24*60*60;
2900                         c->sadb_comb_soft_addtime = 20*60*60;
2901                         c->sadb_comb_hard_usetime = 8*60*60;
2902                         c->sadb_comb_soft_usetime = 7*60*60;
2903                 }
2904         }
2905 }
2906
2907 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2908 {
2909         return 0;
2910 }
2911
2912 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2913 {
2914         struct sk_buff *out_skb;
2915         struct sadb_msg *out_hdr;
2916         int hard;
2917         int hsc;
2918
2919         hard = c->data.hard;
2920         if (hard)
2921                 hsc = 2;
2922         else
2923                 hsc = 1;
2924
2925         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2926         if (IS_ERR(out_skb))
2927                 return PTR_ERR(out_skb);
2928
2929         out_hdr = (struct sadb_msg *) out_skb->data;
2930         out_hdr->sadb_msg_version = PF_KEY_V2;
2931         out_hdr->sadb_msg_type = SADB_EXPIRE;
2932         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2933         out_hdr->sadb_msg_errno = 0;
2934         out_hdr->sadb_msg_reserved = 0;
2935         out_hdr->sadb_msg_seq = 0;
2936         out_hdr->sadb_msg_pid = 0;
2937
2938         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2939         return 0;
2940 }
2941
2942 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2943 {
2944         if (atomic_read(&pfkey_socks_nr) == 0)
2945                 return 0;
2946
2947         switch (c->event) {
2948         case XFRM_MSG_EXPIRE:
2949                 return key_notify_sa_expire(x, c);
2950         case XFRM_MSG_DELSA:
2951         case XFRM_MSG_NEWSA:
2952         case XFRM_MSG_UPDSA:
2953                 return key_notify_sa(x, c);
2954         case XFRM_MSG_FLUSHSA:
2955                 return key_notify_sa_flush(c);
2956         case XFRM_MSG_NEWAE: /* not yet supported */
2957                 break;
2958         default:
2959                 printk("pfkey: Unknown SA event %d\n", c->event);
2960                 break;
2961         }
2962
2963         return 0;
2964 }
2965
2966 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2967 {
2968         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2969                 return 0;
2970
2971         switch (c->event) {
2972         case XFRM_MSG_POLEXPIRE:
2973                 return key_notify_policy_expire(xp, c);
2974         case XFRM_MSG_DELPOLICY:
2975         case XFRM_MSG_NEWPOLICY:
2976         case XFRM_MSG_UPDPOLICY:
2977                 return key_notify_policy(xp, dir, c);
2978         case XFRM_MSG_FLUSHPOLICY:
2979                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2980                         break;
2981                 return key_notify_policy_flush(c);
2982         default:
2983                 printk("pfkey: Unknown policy event %d\n", c->event);
2984                 break;
2985         }
2986
2987         return 0;
2988 }
2989
2990 static u32 get_acqseq(void)
2991 {
2992         u32 res;
2993         static u32 acqseq;
2994         static DEFINE_SPINLOCK(acqseq_lock);
2995
2996         spin_lock_bh(&acqseq_lock);
2997         res = (++acqseq ? : ++acqseq);
2998         spin_unlock_bh(&acqseq_lock);
2999         return res;
3000 }
3001
3002 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3003 {
3004         struct sk_buff *skb;
3005         struct sadb_msg *hdr;
3006         struct sadb_address *addr;
3007         struct sadb_x_policy *pol;
3008         int sockaddr_size;
3009         int size;
3010         struct sadb_x_sec_ctx *sec_ctx;
3011         struct xfrm_sec_ctx *xfrm_ctx;
3012         int ctx_size = 0;
3013
3014         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3015         if (!sockaddr_size)
3016                 return -EINVAL;
3017
3018         size = sizeof(struct sadb_msg) +
3019                 (sizeof(struct sadb_address) * 2) +
3020                 (sockaddr_size * 2) +
3021                 sizeof(struct sadb_x_policy);
3022
3023         if (x->id.proto == IPPROTO_AH)
3024                 size += count_ah_combs(t);
3025         else if (x->id.proto == IPPROTO_ESP)
3026                 size += count_esp_combs(t);
3027
3028         if ((xfrm_ctx = x->security)) {
3029                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3030                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3031         }
3032
3033         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3034         if (skb == NULL)
3035                 return -ENOMEM;
3036
3037         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3038         hdr->sadb_msg_version = PF_KEY_V2;
3039         hdr->sadb_msg_type = SADB_ACQUIRE;
3040         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3041         hdr->sadb_msg_len = size / sizeof(uint64_t);
3042         hdr->sadb_msg_errno = 0;
3043         hdr->sadb_msg_reserved = 0;
3044         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3045         hdr->sadb_msg_pid = 0;
3046
3047         /* src address */
3048         addr = (struct sadb_address*) skb_put(skb,
3049                                               sizeof(struct sadb_address)+sockaddr_size);
3050         addr->sadb_address_len =
3051                 (sizeof(struct sadb_address)+sockaddr_size)/
3052                         sizeof(uint64_t);
3053         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3054         addr->sadb_address_proto = 0;
3055         addr->sadb_address_reserved = 0;
3056         addr->sadb_address_prefixlen =
3057                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3058                                     (struct sockaddr *) (addr + 1),
3059                                     x->props.family);
3060         if (!addr->sadb_address_prefixlen)
3061                 BUG();
3062
3063         /* dst address */
3064         addr = (struct sadb_address*) skb_put(skb,
3065                                               sizeof(struct sadb_address)+sockaddr_size);
3066         addr->sadb_address_len =
3067                 (sizeof(struct sadb_address)+sockaddr_size)/
3068                         sizeof(uint64_t);
3069         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3070         addr->sadb_address_proto = 0;
3071         addr->sadb_address_reserved = 0;
3072         addr->sadb_address_prefixlen =
3073                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3074                                     (struct sockaddr *) (addr + 1),
3075                                     x->props.family);
3076         if (!addr->sadb_address_prefixlen)
3077                 BUG();
3078
3079         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3080         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3081         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3082         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3083         pol->sadb_x_policy_dir = dir+1;
3084         pol->sadb_x_policy_id = xp->index;
3085
3086         /* Set sadb_comb's. */
3087         if (x->id.proto == IPPROTO_AH)
3088                 dump_ah_combs(skb, t);
3089         else if (x->id.proto == IPPROTO_ESP)
3090                 dump_esp_combs(skb, t);
3091
3092         /* security context */
3093         if (xfrm_ctx) {
3094                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3095                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3096                 sec_ctx->sadb_x_sec_len =
3097                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3098                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3099                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3100                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3101                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3102                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3103                        xfrm_ctx->ctx_len);
3104         }
3105
3106         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3107 }
3108
3109 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3110                                                 u8 *data, int len, int *dir)
3111 {
3112         struct xfrm_policy *xp;
3113         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3114         struct sadb_x_sec_ctx *sec_ctx;
3115
3116         switch (sk->sk_family) {
3117         case AF_INET:
3118                 if (opt != IP_IPSEC_POLICY) {
3119                         *dir = -EOPNOTSUPP;
3120                         return NULL;
3121                 }
3122                 break;
3123 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3124         case AF_INET6:
3125                 if (opt != IPV6_IPSEC_POLICY) {
3126                         *dir = -EOPNOTSUPP;
3127                         return NULL;
3128                 }
3129                 break;
3130 #endif
3131         default:
3132                 *dir = -EINVAL;
3133                 return NULL;
3134         }
3135
3136         *dir = -EINVAL;
3137
3138         if (len < sizeof(struct sadb_x_policy) ||
3139             pol->sadb_x_policy_len*8 > len ||
3140             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3141             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3142                 return NULL;
3143
3144         xp = xfrm_policy_alloc(&init_net, GFP_ATOMIC);
3145         if (xp == NULL) {
3146                 *dir = -ENOBUFS;
3147                 return NULL;
3148         }
3149
3150         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3151                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3152
3153         xp->lft.soft_byte_limit = XFRM_INF;
3154         xp->lft.hard_byte_limit = XFRM_INF;
3155         xp->lft.soft_packet_limit = XFRM_INF;
3156         xp->lft.hard_packet_limit = XFRM_INF;
3157         xp->family = sk->sk_family;
3158
3159         xp->xfrm_nr = 0;
3160         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3161             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3162                 goto out;
3163
3164         /* security context too */
3165         if (len >= (pol->sadb_x_policy_len*8 +
3166             sizeof(struct sadb_x_sec_ctx))) {
3167                 char *p = (char *)pol;
3168                 struct xfrm_user_sec_ctx *uctx;
3169
3170                 p += pol->sadb_x_policy_len*8;
3171                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3172                 if (len < pol->sadb_x_policy_len*8 +
3173                     sec_ctx->sadb_x_sec_len) {
3174                         *dir = -EINVAL;
3175                         goto out;
3176                 }
3177                 if ((*dir = verify_sec_ctx_len(p)))
3178                         goto out;
3179                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3180                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3181                 kfree(uctx);
3182
3183                 if (*dir)
3184                         goto out;
3185         }
3186
3187         *dir = pol->sadb_x_policy_dir-1;
3188         return xp;
3189
3190 out:
3191         xp->walk.dead = 1;
3192         xfrm_policy_destroy(xp);
3193         return NULL;
3194 }
3195
3196 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3197 {
3198         struct sk_buff *skb;
3199         struct sadb_msg *hdr;
3200         struct sadb_sa *sa;
3201         struct sadb_address *addr;
3202         struct sadb_x_nat_t_port *n_port;
3203         int sockaddr_size;
3204         int size;
3205         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3206         struct xfrm_encap_tmpl *natt = NULL;
3207
3208         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3209         if (!sockaddr_size)
3210                 return -EINVAL;
3211
3212         if (!satype)
3213                 return -EINVAL;
3214
3215         if (!x->encap)
3216                 return -EINVAL;
3217
3218         natt = x->encap;
3219
3220         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3221          *
3222          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3223          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3224          */
3225
3226         size = sizeof(struct sadb_msg) +
3227                 sizeof(struct sadb_sa) +
3228                 (sizeof(struct sadb_address) * 2) +
3229                 (sockaddr_size * 2) +
3230                 (sizeof(struct sadb_x_nat_t_port) * 2);
3231
3232         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3233         if (skb == NULL)
3234                 return -ENOMEM;
3235
3236         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3237         hdr->sadb_msg_version = PF_KEY_V2;
3238         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3239         hdr->sadb_msg_satype = satype;
3240         hdr->sadb_msg_len = size / sizeof(uint64_t);
3241         hdr->sadb_msg_errno = 0;
3242         hdr->sadb_msg_reserved = 0;
3243         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3244         hdr->sadb_msg_pid = 0;
3245
3246         /* SA */
3247         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3248         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3249         sa->sadb_sa_exttype = SADB_EXT_SA;
3250         sa->sadb_sa_spi = x->id.spi;
3251         sa->sadb_sa_replay = 0;
3252         sa->sadb_sa_state = 0;
3253         sa->sadb_sa_auth = 0;
3254         sa->sadb_sa_encrypt = 0;
3255         sa->sadb_sa_flags = 0;
3256
3257         /* ADDRESS_SRC (old addr) */
3258         addr = (struct sadb_address*)
3259                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3260         addr->sadb_address_len =
3261                 (sizeof(struct sadb_address)+sockaddr_size)/
3262                         sizeof(uint64_t);
3263         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3264         addr->sadb_address_proto = 0;
3265         addr->sadb_address_reserved = 0;
3266         addr->sadb_address_prefixlen =
3267                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3268                                     (struct sockaddr *) (addr + 1),
3269                                     x->props.family);
3270         if (!addr->sadb_address_prefixlen)
3271                 BUG();
3272
3273         /* NAT_T_SPORT (old port) */
3274         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3275         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3276         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3277         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3278         n_port->sadb_x_nat_t_port_reserved = 0;
3279
3280         /* ADDRESS_DST (new addr) */
3281         addr = (struct sadb_address*)
3282                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3283         addr->sadb_address_len =
3284                 (sizeof(struct sadb_address)+sockaddr_size)/
3285                         sizeof(uint64_t);
3286         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3287         addr->sadb_address_proto = 0;
3288         addr->sadb_address_reserved = 0;
3289         addr->sadb_address_prefixlen =
3290                 pfkey_sockaddr_fill(ipaddr, 0,
3291                                     (struct sockaddr *) (addr + 1),
3292                                     x->props.family);
3293         if (!addr->sadb_address_prefixlen)
3294                 BUG();
3295
3296         /* NAT_T_DPORT (new port) */
3297         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3298         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3299         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3300         n_port->sadb_x_nat_t_port_port = sport;
3301         n_port->sadb_x_nat_t_port_reserved = 0;
3302
3303         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3304 }
3305
3306 #ifdef CONFIG_NET_KEY_MIGRATE
3307 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3308                             struct xfrm_selector *sel)
3309 {
3310         struct sadb_address *addr;
3311         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3312         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3313         addr->sadb_address_exttype = type;
3314         addr->sadb_address_proto = sel->proto;
3315         addr->sadb_address_reserved = 0;
3316
3317         switch (type) {
3318         case SADB_EXT_ADDRESS_SRC:
3319                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3320                 pfkey_sockaddr_fill(&sel->saddr, 0,
3321                                     (struct sockaddr *)(addr + 1),
3322                                     sel->family);
3323                 break;
3324         case SADB_EXT_ADDRESS_DST:
3325                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3326                 pfkey_sockaddr_fill(&sel->daddr, 0,
3327                                     (struct sockaddr *)(addr + 1),
3328                                     sel->family);
3329                 break;
3330         default:
3331                 return -EINVAL;
3332         }
3333
3334         return 0;
3335 }
3336
3337
3338 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3339 {
3340         struct sadb_x_kmaddress *kma;
3341         u8 *sa;
3342         int family = k->family;
3343         int socklen = pfkey_sockaddr_len(family);
3344         int size_req;
3345
3346         size_req = (sizeof(struct sadb_x_kmaddress) +
3347                     pfkey_sockaddr_pair_size(family));
3348
3349         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3350         memset(kma, 0, size_req);
3351         kma->sadb_x_kmaddress_len = size_req / 8;
3352         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3353         kma->sadb_x_kmaddress_reserved = k->reserved;
3354
3355         sa = (u8 *)(kma + 1);
3356         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3357             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3358                 return -EINVAL;
3359
3360         return 0;
3361 }
3362
3363 static int set_ipsecrequest(struct sk_buff *skb,
3364                             uint8_t proto, uint8_t mode, int level,
3365                             uint32_t reqid, uint8_t family,
3366                             xfrm_address_t *src, xfrm_address_t *dst)
3367 {
3368         struct sadb_x_ipsecrequest *rq;
3369         u8 *sa;
3370         int socklen = pfkey_sockaddr_len(family);
3371         int size_req;
3372
3373         size_req = sizeof(struct sadb_x_ipsecrequest) +
3374                    pfkey_sockaddr_pair_size(family);
3375
3376         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3377         memset(rq, 0, size_req);
3378         rq->sadb_x_ipsecrequest_len = size_req;
3379         rq->sadb_x_ipsecrequest_proto = proto;
3380         rq->sadb_x_ipsecrequest_mode = mode;
3381         rq->sadb_x_ipsecrequest_level = level;
3382         rq->sadb_x_ipsecrequest_reqid = reqid;
3383
3384         sa = (u8 *) (rq + 1);
3385         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3386             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3387                 return -EINVAL;
3388
3389         return 0;
3390 }
3391 #endif
3392
3393 #ifdef CONFIG_NET_KEY_MIGRATE
3394 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3395                               struct xfrm_migrate *m, int num_bundles,
3396                               struct xfrm_kmaddress *k)
3397 {
3398         int i;
3399         int sasize_sel;
3400         int size = 0;
3401         int size_pol = 0;
3402         struct sk_buff *skb;
3403         struct sadb_msg *hdr;
3404         struct sadb_x_policy *pol;
3405         struct xfrm_migrate *mp;
3406
3407         if (type != XFRM_POLICY_TYPE_MAIN)
3408                 return 0;
3409
3410         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3411                 return -EINVAL;
3412
3413         if (k != NULL) {
3414                 /* addresses for KM */
3415                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3416                                      pfkey_sockaddr_pair_size(k->family));
3417         }
3418
3419         /* selector */
3420         sasize_sel = pfkey_sockaddr_size(sel->family);
3421         if (!sasize_sel)
3422                 return -EINVAL;
3423         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3424
3425         /* policy info */
3426         size_pol += sizeof(struct sadb_x_policy);
3427
3428         /* ipsecrequests */
3429         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3430                 /* old locator pair */
3431                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3432                             pfkey_sockaddr_pair_size(mp->old_family);
3433                 /* new locator pair */
3434                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3435                             pfkey_sockaddr_pair_size(mp->new_family);
3436         }
3437
3438         size += sizeof(struct sadb_msg) + size_pol;
3439
3440         /* alloc buffer */
3441         skb = alloc_skb(size, GFP_ATOMIC);
3442         if (skb == NULL)
3443                 return -ENOMEM;
3444
3445         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3446         hdr->sadb_msg_version = PF_KEY_V2;
3447         hdr->sadb_msg_type = SADB_X_MIGRATE;
3448         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3449         hdr->sadb_msg_len = size / 8;
3450         hdr->sadb_msg_errno = 0;
3451         hdr->sadb_msg_reserved = 0;
3452         hdr->sadb_msg_seq = 0;
3453         hdr->sadb_msg_pid = 0;
3454
3455         /* Addresses to be used by KM for negotiation, if ext is available */
3456         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3457                 return -EINVAL;
3458
3459         /* selector src */
3460         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3461
3462         /* selector dst */
3463         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3464
3465         /* policy information */
3466         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3467         pol->sadb_x_policy_len = size_pol / 8;
3468         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3469         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3470         pol->sadb_x_policy_dir = dir + 1;
3471         pol->sadb_x_policy_id = 0;
3472         pol->sadb_x_policy_priority = 0;
3473
3474         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3475                 /* old ipsecrequest */
3476                 int mode = pfkey_mode_from_xfrm(mp->mode);
3477                 if (mode < 0)
3478                         goto err;
3479                 if (set_ipsecrequest(skb, mp->proto, mode,
3480                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3481                                      mp->reqid, mp->old_family,
3482                                      &mp->old_saddr, &mp->old_daddr) < 0)
3483                         goto err;
3484
3485                 /* new ipsecrequest */
3486                 if (set_ipsecrequest(skb, mp->proto, mode,
3487                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3488                                      mp->reqid, mp->new_family,
3489                                      &mp->new_saddr, &mp->new_daddr) < 0)
3490                         goto err;
3491         }
3492
3493         /* broadcast migrate message to sockets */
3494         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3495
3496         return 0;
3497
3498 err:
3499         kfree_skb(skb);
3500         return -EINVAL;
3501 }
3502 #else
3503 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3504                               struct xfrm_migrate *m, int num_bundles,
3505                               struct xfrm_kmaddress *k)
3506 {
3507         return -ENOPROTOOPT;
3508 }
3509 #endif
3510
3511 static int pfkey_sendmsg(struct kiocb *kiocb,
3512                          struct socket *sock, struct msghdr *msg, size_t len)
3513 {
3514         struct sock *sk = sock->sk;
3515         struct sk_buff *skb = NULL;
3516         struct sadb_msg *hdr = NULL;
3517         int err;
3518
3519         err = -EOPNOTSUPP;
3520         if (msg->msg_flags & MSG_OOB)
3521                 goto out;
3522
3523         err = -EMSGSIZE;
3524         if ((unsigned)len > sk->sk_sndbuf - 32)
3525                 goto out;
3526
3527         err = -ENOBUFS;
3528         skb = alloc_skb(len, GFP_KERNEL);
3529         if (skb == NULL)
3530                 goto out;
3531
3532         err = -EFAULT;
3533         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3534                 goto out;
3535
3536         hdr = pfkey_get_base_msg(skb, &err);
3537         if (!hdr)
3538                 goto out;
3539
3540         mutex_lock(&xfrm_cfg_mutex);
3541         err = pfkey_process(sk, skb, hdr);
3542         mutex_unlock(&xfrm_cfg_mutex);
3543
3544 out:
3545         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3546                 err = 0;
3547         if (skb)
3548                 kfree_skb(skb);
3549
3550         return err ? : len;
3551 }
3552
3553 static int pfkey_recvmsg(struct kiocb *kiocb,
3554                          struct socket *sock, struct msghdr *msg, size_t len,
3555                          int flags)
3556 {
3557         struct sock *sk = sock->sk;
3558         struct pfkey_sock *pfk = pfkey_sk(sk);
3559         struct sk_buff *skb;
3560         int copied, err;
3561
3562         err = -EINVAL;
3563         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3564                 goto out;
3565
3566         msg->msg_namelen = 0;
3567         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3568         if (skb == NULL)
3569                 goto out;
3570
3571         copied = skb->len;
3572         if (copied > len) {
3573                 msg->msg_flags |= MSG_TRUNC;
3574                 copied = len;
3575         }
3576
3577         skb_reset_transport_header(skb);
3578         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3579         if (err)
3580                 goto out_free;
3581
3582         sock_recv_timestamp(msg, sk, skb);
3583
3584         err = (flags & MSG_TRUNC) ? skb->len : copied;
3585
3586         if (pfk->dump.dump != NULL &&
3587             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3588                 pfkey_do_dump(pfk);
3589
3590 out_free:
3591         skb_free_datagram(sk, skb);
3592 out:
3593         return err;
3594 }
3595
3596 static const struct proto_ops pfkey_ops = {
3597         .family         =       PF_KEY,
3598         .owner          =       THIS_MODULE,
3599         /* Operations that make no sense on pfkey sockets. */
3600         .bind           =       sock_no_bind,
3601         .connect        =       sock_no_connect,
3602         .socketpair     =       sock_no_socketpair,
3603         .accept         =       sock_no_accept,
3604         .getname        =       sock_no_getname,
3605         .ioctl          =       sock_no_ioctl,
3606         .listen         =       sock_no_listen,
3607         .shutdown       =       sock_no_shutdown,
3608         .setsockopt     =       sock_no_setsockopt,
3609         .getsockopt     =       sock_no_getsockopt,
3610         .mmap           =       sock_no_mmap,
3611         .sendpage       =       sock_no_sendpage,
3612
3613         /* Now the operations that really occur. */
3614         .release        =       pfkey_release,
3615         .poll           =       datagram_poll,
3616         .sendmsg        =       pfkey_sendmsg,
3617         .recvmsg        =       pfkey_recvmsg,
3618 };
3619
3620 static struct net_proto_family pfkey_family_ops = {
3621         .family =       PF_KEY,
3622         .create =       pfkey_create,
3623         .owner  =       THIS_MODULE,
3624 };
3625
3626 #ifdef CONFIG_PROC_FS
3627 static int pfkey_seq_show(struct seq_file *f, void *v)
3628 {
3629         struct sock *s;
3630
3631         s = (struct sock *)v;
3632         if (v == SEQ_START_TOKEN)
3633                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3634         else
3635                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3636                                s,
3637                                atomic_read(&s->sk_refcnt),
3638                                atomic_read(&s->sk_rmem_alloc),
3639                                atomic_read(&s->sk_wmem_alloc),
3640                                sock_i_uid(s),
3641                                sock_i_ino(s)
3642                                );
3643         return 0;
3644 }
3645
3646 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3647 {
3648         struct sock *s;
3649         struct hlist_node *node;
3650         loff_t pos = *ppos;
3651
3652         read_lock(&pfkey_table_lock);
3653         if (pos == 0)
3654                 return SEQ_START_TOKEN;
3655
3656         sk_for_each(s, node, &pfkey_table)
3657                 if (pos-- == 1)
3658                         return s;
3659
3660         return NULL;
3661 }
3662
3663 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3664 {
3665         ++*ppos;
3666         return (v == SEQ_START_TOKEN) ?
3667                 sk_head(&pfkey_table) :
3668                         sk_next((struct sock *)v);
3669 }
3670
3671 static void pfkey_seq_stop(struct seq_file *f, void *v)
3672 {
3673         read_unlock(&pfkey_table_lock);
3674 }
3675
3676 static struct seq_operations pfkey_seq_ops = {
3677         .start  = pfkey_seq_start,
3678         .next   = pfkey_seq_next,
3679         .stop   = pfkey_seq_stop,
3680         .show   = pfkey_seq_show,
3681 };
3682
3683 static int pfkey_seq_open(struct inode *inode, struct file *file)
3684 {
3685         return seq_open(file, &pfkey_seq_ops);
3686 }
3687
3688 static struct file_operations pfkey_proc_ops = {
3689         .open    = pfkey_seq_open,
3690         .read    = seq_read,
3691         .llseek  = seq_lseek,
3692         .release = seq_release,
3693 };
3694
3695 static int pfkey_init_proc(void)
3696 {
3697         struct proc_dir_entry *e;
3698
3699         e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3700         if (e == NULL)
3701                 return -ENOMEM;
3702
3703         return 0;
3704 }
3705
3706 static void pfkey_exit_proc(void)
3707 {
3708         proc_net_remove(&init_net, "pfkey");
3709 }
3710 #else
3711 static inline int pfkey_init_proc(void)
3712 {
3713         return 0;
3714 }
3715
3716 static inline void pfkey_exit_proc(void)
3717 {
3718 }
3719 #endif
3720
3721 static struct xfrm_mgr pfkeyv2_mgr =
3722 {
3723         .id             = "pfkeyv2",
3724         .notify         = pfkey_send_notify,
3725         .acquire        = pfkey_send_acquire,
3726         .compile_policy = pfkey_compile_policy,
3727         .new_mapping    = pfkey_send_new_mapping,
3728         .notify_policy  = pfkey_send_policy_notify,
3729         .migrate        = pfkey_send_migrate,
3730 };
3731
3732 static void __exit ipsec_pfkey_exit(void)
3733 {
3734         xfrm_unregister_km(&pfkeyv2_mgr);
3735         pfkey_exit_proc();
3736         sock_unregister(PF_KEY);
3737         proto_unregister(&key_proto);
3738 }
3739
3740 static int __init ipsec_pfkey_init(void)
3741 {
3742         int err = proto_register(&key_proto, 0);
3743
3744         if (err != 0)
3745                 goto out;
3746
3747         err = sock_register(&pfkey_family_ops);
3748         if (err != 0)
3749                 goto out_unregister_key_proto;
3750         err = pfkey_init_proc();
3751         if (err != 0)
3752                 goto out_sock_unregister;
3753         err = xfrm_register_km(&pfkeyv2_mgr);
3754         if (err != 0)
3755                 goto out_remove_proc_entry;
3756 out:
3757         return err;
3758 out_remove_proc_entry:
3759         pfkey_exit_proc();
3760 out_sock_unregister:
3761         sock_unregister(PF_KEY);
3762 out_unregister_key_proto:
3763         proto_unregister(&key_proto);
3764         goto out;
3765 }
3766
3767 module_init(ipsec_pfkey_init);
3768 module_exit(ipsec_pfkey_exit);
3769 MODULE_LICENSE("GPL");
3770 MODULE_ALIAS_NETPROTO(PF_KEY);