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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 };
 402
 403 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 404 static int verify_address_len(void *p)
 405 {
 406         struct sadb_address *sp = p;
 407         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 408         struct sockaddr_in *sin;
 409 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 410         struct sockaddr_in6 *sin6;
 411 #endif
 412         int len;
 413
 414         switch (addr->sa_family) {
 415         case AF_INET:
 416                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 417                 if (sp->sadb_address_len != len ||
 418                     sp->sadb_address_prefixlen > 32)
 419                         return -EINVAL;
 420                 break;
 421 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 422         case AF_INET6:
 423                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 424                 if (sp->sadb_address_len != len ||
 425                     sp->sadb_address_prefixlen > 128)
 426                         return -EINVAL;
 427                 break;
 428 #endif
 429         default:
 430                 /* It is user using kernel to keep track of security
 431                  * associations for another protocol, such as
 432                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 433                  * lengths.
 434                  *
 435                  * XXX Actually, association/policy database is not yet
 436                  * XXX able to cope with arbitrary sockaddr families.
 437                  * XXX When it can, remove this -EINVAL.  -DaveM
 438                  */
 439                 return -EINVAL;
 440                 break;
 441         }
 442
 443         return 0;
 444 }
 445
 446 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 447 {
 448         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 449                             sec_ctx->sadb_x_ctx_len,
 450                             sizeof(uint64_t));
 451 }
 452
 453 static inline int verify_sec_ctx_len(void *p)
 454 {
 455         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 456         int len = sec_ctx->sadb_x_ctx_len;
 457
 458         if (len > PAGE_SIZE)
 459                 return -EINVAL;
 460
 461         len = pfkey_sec_ctx_len(sec_ctx);
 462
 463         if (sec_ctx->sadb_x_sec_len != len)
 464                 return -EINVAL;
 465
 466         return 0;
 467 }
 468
 469 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 470 {
 471         struct xfrm_user_sec_ctx *uctx = NULL;
 472         int ctx_size = sec_ctx->sadb_x_ctx_len;
 473
 474         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 475
 476         if (!uctx)
 477                 return NULL;
 478
 479         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 480         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 481         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 482         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 483         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 484         memcpy(uctx + 1, sec_ctx + 1,
 485                uctx->ctx_len);
 486
 487         return uctx;
 488 }
 489
 490 static int present_and_same_family(struct sadb_address *src,
 491                                    struct sadb_address *dst)
 492 {
 493         struct sockaddr *s_addr, *d_addr;
 494
 495         if (!src || !dst)
 496                 return 0;
 497
 498         s_addr = (struct sockaddr *)(src + 1);
 499         d_addr = (struct sockaddr *)(dst + 1);
 500         if (s_addr->sa_family != d_addr->sa_family)
 501                 return 0;
 502         if (s_addr->sa_family != AF_INET
 503 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 504             && s_addr->sa_family != AF_INET6
 505 #endif
 506                 )
 507                 return 0;
 508
 509         return 1;
 510 }
 511
 512 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 513 {
 514         char *p = (char *) hdr;
 515         int len = skb->len;
 516
 517         len -= sizeof(*hdr);
 518         p += sizeof(*hdr);
 519         while (len > 0) {
 520                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 521                 uint16_t ext_type;
 522                 int ext_len;
 523
 524                 ext_len  = ehdr->sadb_ext_len;
 525                 ext_len *= sizeof(uint64_t);
 526                 ext_type = ehdr->sadb_ext_type;
 527                 if (ext_len < sizeof(uint64_t) ||
 528                     ext_len > len ||
 529                     ext_type == SADB_EXT_RESERVED)
 530                         return -EINVAL;
 531
 532                 if (ext_type <= SADB_EXT_MAX) {
 533                         int min = (int) sadb_ext_min_len[ext_type];
 534                         if (ext_len < min)
 535                                 return -EINVAL;
 536                         if (ext_hdrs[ext_type-1] != NULL)
 537                                 return -EINVAL;
 538                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 539                             ext_type == SADB_EXT_ADDRESS_DST ||
 540                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 541                             ext_type == SADB_X_EXT_NAT_T_OA) {
 542                                 if (verify_address_len(p))
 543                                         return -EINVAL;
 544                         }
 545                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 546                                 if (verify_sec_ctx_len(p))
 547                                         return -EINVAL;
 548                         }
 549                         ext_hdrs[ext_type-1] = p;
 550                 }
 551                 p   += ext_len;
 552                 len -= ext_len;
 553         }
 554
 555         return 0;
 556 }
 557
 558 static uint16_t
 559 pfkey_satype2proto(uint8_t satype)
 560 {
 561         switch (satype) {
 562         case SADB_SATYPE_UNSPEC:
 563                 return IPSEC_PROTO_ANY;
 564         case SADB_SATYPE_AH:
 565                 return IPPROTO_AH;
 566         case SADB_SATYPE_ESP:
 567                 return IPPROTO_ESP;
 568         case SADB_X_SATYPE_IPCOMP:
 569                 return IPPROTO_COMP;
 570                 break;
 571         default:
 572                 return 0;
 573         }
 574         /* NOTREACHED */
 575 }
 576
 577 static uint8_t
 578 pfkey_proto2satype(uint16_t proto)
 579 {
 580         switch (proto) {
 581         case IPPROTO_AH:
 582                 return SADB_SATYPE_AH;
 583         case IPPROTO_ESP:
 584                 return SADB_SATYPE_ESP;
 585         case IPPROTO_COMP:
 586                 return SADB_X_SATYPE_IPCOMP;
 587                 break;
 588         default:
 589                 return 0;
 590         }
 591         /* NOTREACHED */
 592 }
 593
 594 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 595  * say specifically 'just raw sockets' as we encode them as 255.
 596  */
 597
 598 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 599 {
 600         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 601 }
 602
 603 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 604 {
 605         return (proto ? proto : IPSEC_PROTO_ANY);
 606 }
 607
 608 static inline int pfkey_sockaddr_len(sa_family_t family)
 609 {
 610         switch (family) {
 611         case AF_INET:
 612                 return sizeof(struct sockaddr_in);
 613 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 614         case AF_INET6:
 615                 return sizeof(struct sockaddr_in6);
 616 #endif
 617         }
 618         return 0;
 619 }
 620
 621 static
 622 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 623 {
 624         switch (sa->sa_family) {
 625         case AF_INET:
 626                 xaddr->a4 =
 627                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 628                 return AF_INET;
 629 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 630         case AF_INET6:
 631                 memcpy(xaddr->a6,
 632                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 633                        sizeof(struct in6_addr));
 634                 return AF_INET6;
 635 #endif
 636         }
 637         return 0;
 638 }
 639
 640 static
 641 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
 642 {
 643         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 644                                       xaddr);
 645 }
 646
 647 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 648 {
 649         struct sadb_sa *sa;
 650         struct sadb_address *addr;
 651         uint16_t proto;
 652         unsigned short family;
 653         xfrm_address_t *xaddr;
 654
 655         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 656         if (sa == NULL)
 657                 return NULL;
 658
 659         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 660         if (proto == 0)
 661                 return NULL;
 662
 663         /* sadb_address_len should be checked by caller */
 664         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 665         if (addr == NULL)
 666                 return NULL;
 667
 668         family = ((struct sockaddr *)(addr + 1))->sa_family;
 669         switch (family) {
 670         case AF_INET:
 671                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 672                 break;
 673 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 674         case AF_INET6:
 675                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 676                 break;
 677 #endif
 678         default:
 679                 xaddr = NULL;
 680         }
 681
 682         if (!xaddr)
 683                 return NULL;
 684
 685         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 686 }
 687
 688 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 689
 690 static int
 691 pfkey_sockaddr_size(sa_family_t family)
 692 {
 693         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 694 }
 695
 696 static inline int pfkey_mode_from_xfrm(int mode)
 697 {
 698         switch(mode) {
 699         case XFRM_MODE_TRANSPORT:
 700                 return IPSEC_MODE_TRANSPORT;
 701         case XFRM_MODE_TUNNEL:
 702                 return IPSEC_MODE_TUNNEL;
 703         case XFRM_MODE_BEET:
 704                 return IPSEC_MODE_BEET;
 705         default:
 706                 return -1;
 707         }
 708 }
 709
 710 static inline int pfkey_mode_to_xfrm(int mode)
 711 {
 712         switch(mode) {
 713         case IPSEC_MODE_ANY:    /*XXX*/
 714         case IPSEC_MODE_TRANSPORT:
 715                 return XFRM_MODE_TRANSPORT;
 716         case IPSEC_MODE_TUNNEL:
 717                 return XFRM_MODE_TUNNEL;
 718         case IPSEC_MODE_BEET:
 719                 return XFRM_MODE_BEET;
 720         default:
 721                 return -1;
 722         }
 723 }
 724
 725 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
 726                                        struct sockaddr *sa,
 727                                        unsigned short family)
 728 {
 729         switch (family) {
 730         case AF_INET:
 731             {
 732                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 733                 sin->sin_family = AF_INET;
 734                 sin->sin_port = port;
 735                 sin->sin_addr.s_addr = xaddr->a4;
 736                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 737                 return 32;
 738             }
 739 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 740         case AF_INET6:
 741             {
 742                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 743                 sin6->sin6_family = AF_INET6;
 744                 sin6->sin6_port = port;
 745                 sin6->sin6_flowinfo = 0;
 746                 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
 747                 sin6->sin6_scope_id = 0;
 748                 return 128;
 749             }
 750 #endif
 751         }
 752         return 0;
 753 }
 754
 755 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
 756                                               int add_keys, int hsc)
 757 {
 758         struct sk_buff *skb;
 759         struct sadb_msg *hdr;
 760         struct sadb_sa *sa;
 761         struct sadb_lifetime *lifetime;
 762         struct sadb_address *addr;
 763         struct sadb_key *key;
 764         struct sadb_x_sa2 *sa2;
 765         struct sadb_x_sec_ctx *sec_ctx;
 766         struct xfrm_sec_ctx *xfrm_ctx;
 767         int ctx_size = 0;
 768         int size;
 769         int auth_key_size = 0;
 770         int encrypt_key_size = 0;
 771         int sockaddr_size;
 772         struct xfrm_encap_tmpl *natt = NULL;
 773         int mode;
 774
 775         /* address family check */
 776         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 777         if (!sockaddr_size)
 778                 return ERR_PTR(-EINVAL);
 779
 780         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 781            key(AE), (identity(SD),) (sensitivity)> */
 782         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 783                 sizeof(struct sadb_lifetime) +
 784                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 785                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 786                         sizeof(struct sadb_address)*2 +
 787                                 sockaddr_size*2 +
 788                                         sizeof(struct sadb_x_sa2);
 789
 790         if ((xfrm_ctx = x->security)) {
 791                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 792                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 793         }
 794
 795         /* identity & sensitivity */
 796         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 797                 size += sizeof(struct sadb_address) + sockaddr_size;
 798
 799         if (add_keys) {
 800                 if (x->aalg && x->aalg->alg_key_len) {
 801                         auth_key_size =
 802                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 803                         size += sizeof(struct sadb_key) + auth_key_size;
 804                 }
 805                 if (x->ealg && x->ealg->alg_key_len) {
 806                         encrypt_key_size =
 807                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 808                         size += sizeof(struct sadb_key) + encrypt_key_size;
 809                 }
 810         }
 811         if (x->encap)
 812                 natt = x->encap;
 813
 814         if (natt && natt->encap_type) {
 815                 size += sizeof(struct sadb_x_nat_t_type);
 816                 size += sizeof(struct sadb_x_nat_t_port);
 817                 size += sizeof(struct sadb_x_nat_t_port);
 818         }
 819
 820         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 821         if (skb == NULL)
 822                 return ERR_PTR(-ENOBUFS);
 823
 824         /* call should fill header later */
 825         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 826         memset(hdr, 0, size);   /* XXX do we need this ? */
 827         hdr->sadb_msg_len = size / sizeof(uint64_t);
 828
 829         /* sa */
 830         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 831         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 832         sa->sadb_sa_exttype = SADB_EXT_SA;
 833         sa->sadb_sa_spi = x->id.spi;
 834         sa->sadb_sa_replay = x->props.replay_window;
 835         switch (x->km.state) {
 836         case XFRM_STATE_VALID:
 837                 sa->sadb_sa_state = x->km.dying ?
 838                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 839                 break;
 840         case XFRM_STATE_ACQ:
 841                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 842                 break;
 843         default:
 844                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 845                 break;
 846         }
 847         sa->sadb_sa_auth = 0;
 848         if (x->aalg) {
 849                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 850                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 851         }
 852         sa->sadb_sa_encrypt = 0;
 853         BUG_ON(x->ealg && x->calg);
 854         if (x->ealg) {
 855                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 856                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 857         }
 858         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 859         if (x->calg) {
 860                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 861                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 862         }
 863
 864         sa->sadb_sa_flags = 0;
 865         if (x->props.flags & XFRM_STATE_NOECN)
 866                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 867         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 868                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 869         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 870                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 871
 872         /* hard time */
 873         if (hsc & 2) {
 874                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 875                                                              sizeof(struct sadb_lifetime));
 876                 lifetime->sadb_lifetime_len =
 877                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 878                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 879                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 880                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 881                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 882                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 883         }
 884         /* soft time */
 885         if (hsc & 1) {
 886                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 887                                                              sizeof(struct sadb_lifetime));
 888                 lifetime->sadb_lifetime_len =
 889                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 890                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 891                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 892                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 893                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 894                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 895         }
 896         /* current time */
 897         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 898                                                      sizeof(struct sadb_lifetime));
 899         lifetime->sadb_lifetime_len =
 900                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 901         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 902         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 903         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 904         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 905         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 906         /* src address */
 907         addr = (struct sadb_address*) skb_put(skb,
 908                                               sizeof(struct sadb_address)+sockaddr_size);
 909         addr->sadb_address_len =
 910                 (sizeof(struct sadb_address)+sockaddr_size)/
 911                         sizeof(uint64_t);
 912         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 913         /* "if the ports are non-zero, then the sadb_address_proto field,
 914            normally zero, MUST be filled in with the transport
 915            protocol's number." - RFC2367 */
 916         addr->sadb_address_proto = 0;
 917         addr->sadb_address_reserved = 0;
 918
 919         addr->sadb_address_prefixlen =
 920                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 921                                     (struct sockaddr *) (addr + 1),
 922                                     x->props.family);
 923         if (!addr->sadb_address_prefixlen)
 924                 BUG();
 925
 926         /* dst address */
 927         addr = (struct sadb_address*) skb_put(skb,
 928                                               sizeof(struct sadb_address)+sockaddr_size);
 929         addr->sadb_address_len =
 930                 (sizeof(struct sadb_address)+sockaddr_size)/
 931                         sizeof(uint64_t);
 932         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 933         addr->sadb_address_proto = 0;
 934         addr->sadb_address_reserved = 0;
 935
 936         addr->sadb_address_prefixlen =
 937                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 938                                     (struct sockaddr *) (addr + 1),
 939                                     x->props.family);
 940         if (!addr->sadb_address_prefixlen)
 941                 BUG();
 942
 943         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 944                           x->props.family)) {
 945                 addr = (struct sadb_address*) skb_put(skb,
 946                         sizeof(struct sadb_address)+sockaddr_size);
 947                 addr->sadb_address_len =
 948                         (sizeof(struct sadb_address)+sockaddr_size)/
 949                         sizeof(uint64_t);
 950                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 951                 addr->sadb_address_proto =
 952                         pfkey_proto_from_xfrm(x->sel.proto);
 953                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 954                 addr->sadb_address_reserved = 0;
 955
 956                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 957                                     (struct sockaddr *) (addr + 1),
 958                                     x->props.family);
 959         }
 960
 961         /* auth key */
 962         if (add_keys && auth_key_size) {
 963                 key = (struct sadb_key *) skb_put(skb,
 964                                                   sizeof(struct sadb_key)+auth_key_size);
 965                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 966                         sizeof(uint64_t);
 967                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 968                 key->sadb_key_bits = x->aalg->alg_key_len;
 969                 key->sadb_key_reserved = 0;
 970                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 971         }
 972         /* encrypt key */
 973         if (add_keys && encrypt_key_size) {
 974                 key = (struct sadb_key *) skb_put(skb,
 975                                                   sizeof(struct sadb_key)+encrypt_key_size);
 976                 key->sadb_key_len = (sizeof(struct sadb_key) +
 977                                      encrypt_key_size) / sizeof(uint64_t);
 978                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 979                 key->sadb_key_bits = x->ealg->alg_key_len;
 980                 key->sadb_key_reserved = 0;
 981                 memcpy(key + 1, x->ealg->alg_key,
 982                        (x->ealg->alg_key_len+7)/8);
 983         }
 984
 985         /* sa */
 986         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 987         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 988         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 989         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 990                 kfree_skb(skb);
 991                 return ERR_PTR(-EINVAL);
 992         }
 993         sa2->sadb_x_sa2_mode = mode;
 994         sa2->sadb_x_sa2_reserved1 = 0;
 995         sa2->sadb_x_sa2_reserved2 = 0;
 996         sa2->sadb_x_sa2_sequence = 0;
 997         sa2->sadb_x_sa2_reqid = x->props.reqid;
 998
 999         if (natt && natt->encap_type) {
1000                 struct sadb_x_nat_t_type *n_type;
1001                 struct sadb_x_nat_t_port *n_port;
1002
1003                 /* type */
1004                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1005                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1006                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1007                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1008                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1009                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1010                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1011
1012                 /* source port */
1013                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1014                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1015                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1016                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1017                 n_port->sadb_x_nat_t_port_reserved = 0;
1018
1019                 /* dest port */
1020                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1021                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1022                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1023                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1024                 n_port->sadb_x_nat_t_port_reserved = 0;
1025         }
1026
1027         /* security context */
1028         if (xfrm_ctx) {
1029                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1030                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1031                 sec_ctx->sadb_x_sec_len =
1032                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1033                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1034                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1035                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1036                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1037                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1038                        xfrm_ctx->ctx_len);
1039         }
1040
1041         return skb;
1042 }
1043
1044
1045 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1046 {
1047         struct sk_buff *skb;
1048
1049         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1050
1051         return skb;
1052 }
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1055                                                           int hsc)
1056 {
1057         return __pfkey_xfrm_state2msg(x, 0, hsc);
1058 }
1059
1060 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
1061                                                 void **ext_hdrs)
1062 {
1063         struct xfrm_state *x;
1064         struct sadb_lifetime *lifetime;
1065         struct sadb_sa *sa;
1066         struct sadb_key *key;
1067         struct sadb_x_sec_ctx *sec_ctx;
1068         uint16_t proto;
1069         int err;
1070
1071
1072         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1073         if (!sa ||
1074             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1075                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1076                 return ERR_PTR(-EINVAL);
1077         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1078             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1079                 return ERR_PTR(-EINVAL);
1080         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1081             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1082                 return ERR_PTR(-EINVAL);
1083         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1084             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1085                 return ERR_PTR(-EINVAL);
1086
1087         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1088         if (proto == 0)
1089                 return ERR_PTR(-EINVAL);
1090
1091         /* default error is no buffer space */
1092         err = -ENOBUFS;
1093
1094         /* RFC2367:
1095
1096    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1097    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1098    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1099    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1100    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1101    not true.
1102
1103            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1104            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1105          */
1106         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1107             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1108              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1109             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1110                 return ERR_PTR(-EINVAL);
1111         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1112         if (key != NULL &&
1113             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1114             ((key->sadb_key_bits+7) / 8 == 0 ||
1115              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1116                 return ERR_PTR(-EINVAL);
1117         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1118         if (key != NULL &&
1119             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1120             ((key->sadb_key_bits+7) / 8 == 0 ||
1121              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1122                 return ERR_PTR(-EINVAL);
1123
1124         x = xfrm_state_alloc();
1125         if (x == NULL)
1126                 return ERR_PTR(-ENOBUFS);
1127
1128         x->id.proto = proto;
1129         x->id.spi = sa->sadb_sa_spi;
1130         x->props.replay_window = sa->sadb_sa_replay;
1131         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1132                 x->props.flags |= XFRM_STATE_NOECN;
1133         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1134                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1135         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1136                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1137
1138         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1139         if (lifetime != NULL) {
1140                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1141                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1142                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1143                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1144         }
1145         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1146         if (lifetime != NULL) {
1147                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1148                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1149                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1150                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1151         }
1152
1153         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1154         if (sec_ctx != NULL) {
1155                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1156
1157                 if (!uctx)
1158                         goto out;
1159
1160                 err = security_xfrm_state_alloc(x, uctx);
1161                 kfree(uctx);
1162
1163                 if (err)
1164                         goto out;
1165         }
1166
1167         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1168         if (sa->sadb_sa_auth) {
1169                 int keysize = 0;
1170                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1171                 if (!a) {
1172                         err = -ENOSYS;
1173                         goto out;
1174                 }
1175                 if (key)
1176                         keysize = (key->sadb_key_bits + 7) / 8;
1177                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1178                 if (!x->aalg)
1179                         goto out;
1180                 strcpy(x->aalg->alg_name, a->name);
1181                 x->aalg->alg_key_len = 0;
1182                 if (key) {
1183                         x->aalg->alg_key_len = key->sadb_key_bits;
1184                         memcpy(x->aalg->alg_key, key+1, keysize);
1185                 }
1186                 x->props.aalgo = sa->sadb_sa_auth;
1187                 /* x->algo.flags = sa->sadb_sa_flags; */
1188         }
1189         if (sa->sadb_sa_encrypt) {
1190                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1191                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1192                         if (!a) {
1193                                 err = -ENOSYS;
1194                                 goto out;
1195                         }
1196                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1197                         if (!x->calg)
1198                                 goto out;
1199                         strcpy(x->calg->alg_name, a->name);
1200                         x->props.calgo = sa->sadb_sa_encrypt;
1201                 } else {
1202                         int keysize = 0;
1203                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1204                         if (!a) {
1205                                 err = -ENOSYS;
1206                                 goto out;
1207                         }
1208                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1209                         if (key)
1210                                 keysize = (key->sadb_key_bits + 7) / 8;
1211                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1212                         if (!x->ealg)
1213                                 goto out;
1214                         strcpy(x->ealg->alg_name, a->name);
1215                         x->ealg->alg_key_len = 0;
1216                         if (key) {
1217                                 x->ealg->alg_key_len = key->sadb_key_bits;
1218                                 memcpy(x->ealg->alg_key, key+1, keysize);
1219                         }
1220                         x->props.ealgo = sa->sadb_sa_encrypt;
1221                 }
1222         }
1223         /* x->algo.flags = sa->sadb_sa_flags; */
1224
1225         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1226                                                     &x->props.saddr);
1227         if (!x->props.family) {
1228                 err = -EAFNOSUPPORT;
1229                 goto out;
1230         }
1231         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1232                                   &x->id.daddr);
1233
1234         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1235                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1236                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1237                 if (mode < 0) {
1238                         err = -EINVAL;
1239                         goto out;
1240                 }
1241                 x->props.mode = mode;
1242                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1243         }
1244
1245         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1246                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1247
1248                 /* Nobody uses this, but we try. */
1249                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1250                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1251         }
1252
1253         if (!x->sel.family)
1254                 x->sel.family = x->props.family;
1255
1256         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1257                 struct sadb_x_nat_t_type* n_type;
1258                 struct xfrm_encap_tmpl *natt;
1259
1260                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1261                 if (!x->encap)
1262                         goto out;
1263
1264                 natt = x->encap;
1265                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1266                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1267
1268                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1269                         struct sadb_x_nat_t_port* n_port =
1270                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1271                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1272                 }
1273                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1274                         struct sadb_x_nat_t_port* n_port =
1275                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1276                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1277                 }
1278         }
1279
1280         err = xfrm_init_state(x);
1281         if (err)
1282                 goto out;
1283
1284         x->km.seq = hdr->sadb_msg_seq;
1285         return x;
1286
1287 out:
1288         x->km.state = XFRM_STATE_DEAD;
1289         xfrm_state_put(x);
1290         return ERR_PTR(err);
1291 }
1292
1293 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1294 {
1295         return -EOPNOTSUPP;
1296 }
1297
1298 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1299 {
1300         struct sk_buff *resp_skb;
1301         struct sadb_x_sa2 *sa2;
1302         struct sadb_address *saddr, *daddr;
1303         struct sadb_msg *out_hdr;
1304         struct sadb_spirange *range;
1305         struct xfrm_state *x = NULL;
1306         int mode;
1307         int err;
1308         u32 min_spi, max_spi;
1309         u32 reqid;
1310         u8 proto;
1311         unsigned short family;
1312         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1313
1314         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1315                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1316                 return -EINVAL;
1317
1318         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1319         if (proto == 0)
1320                 return -EINVAL;
1321
1322         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1323                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1324                 if (mode < 0)
1325                         return -EINVAL;
1326                 reqid = sa2->sadb_x_sa2_reqid;
1327         } else {
1328                 mode = 0;
1329                 reqid = 0;
1330         }
1331
1332         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1333         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1334
1335         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1336         switch (family) {
1337         case AF_INET:
1338                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1339                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1340                 break;
1341 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1342         case AF_INET6:
1343                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1344                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1345                 break;
1346 #endif
1347         }
1348
1349         if (hdr->sadb_msg_seq) {
1350                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1351                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1352                         xfrm_state_put(x);
1353                         x = NULL;
1354                 }
1355         }
1356
1357         if (!x)
1358                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1359
1360         if (x == NULL)
1361                 return -ENOENT;
1362
1363         min_spi = 0x100;
1364         max_spi = 0x0fffffff;
1365
1366         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1367         if (range) {
1368                 min_spi = range->sadb_spirange_min;
1369                 max_spi = range->sadb_spirange_max;
1370         }
1371
1372         err = xfrm_alloc_spi(x, min_spi, max_spi);
1373         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1374
1375         if (IS_ERR(resp_skb)) {
1376                 xfrm_state_put(x);
1377                 return  PTR_ERR(resp_skb);
1378         }
1379
1380         out_hdr = (struct sadb_msg *) resp_skb->data;
1381         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1382         out_hdr->sadb_msg_type = SADB_GETSPI;
1383         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1384         out_hdr->sadb_msg_errno = 0;
1385         out_hdr->sadb_msg_reserved = 0;
1386         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1387         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1388
1389         xfrm_state_put(x);
1390
1391         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1392
1393         return 0;
1394 }
1395
1396 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1397 {
1398         struct xfrm_state *x;
1399
1400         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1401                 return -EOPNOTSUPP;
1402
1403         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1404                 return 0;
1405
1406         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1407         if (x == NULL)
1408                 return 0;
1409
1410         spin_lock_bh(&x->lock);
1411         if (x->km.state == XFRM_STATE_ACQ) {
1412                 x->km.state = XFRM_STATE_ERROR;
1413                 wake_up(&km_waitq);
1414         }
1415         spin_unlock_bh(&x->lock);
1416         xfrm_state_put(x);
1417         return 0;
1418 }
1419
1420 static inline int event2poltype(int event)
1421 {
1422         switch (event) {
1423         case XFRM_MSG_DELPOLICY:
1424                 return SADB_X_SPDDELETE;
1425         case XFRM_MSG_NEWPOLICY:
1426                 return SADB_X_SPDADD;
1427         case XFRM_MSG_UPDPOLICY:
1428                 return SADB_X_SPDUPDATE;
1429         case XFRM_MSG_POLEXPIRE:
1430         //      return SADB_X_SPDEXPIRE;
1431         default:
1432                 printk("pfkey: Unknown policy event %d\n", event);
1433                 break;
1434         }
1435
1436         return 0;
1437 }
1438
1439 static inline int event2keytype(int event)
1440 {
1441         switch (event) {
1442         case XFRM_MSG_DELSA:
1443                 return SADB_DELETE;
1444         case XFRM_MSG_NEWSA:
1445                 return SADB_ADD;
1446         case XFRM_MSG_UPDSA:
1447                 return SADB_UPDATE;
1448         case XFRM_MSG_EXPIRE:
1449                 return SADB_EXPIRE;
1450         default:
1451                 printk("pfkey: Unknown SA event %d\n", event);
1452                 break;
1453         }
1454
1455         return 0;
1456 }
1457
1458 /* ADD/UPD/DEL */
1459 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1460 {
1461         struct sk_buff *skb;
1462         struct sadb_msg *hdr;
1463
1464         skb = pfkey_xfrm_state2msg(x);
1465
1466         if (IS_ERR(skb))
1467                 return PTR_ERR(skb);
1468
1469         hdr = (struct sadb_msg *) skb->data;
1470         hdr->sadb_msg_version = PF_KEY_V2;
1471         hdr->sadb_msg_type = event2keytype(c->event);
1472         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1473         hdr->sadb_msg_errno = 0;
1474         hdr->sadb_msg_reserved = 0;
1475         hdr->sadb_msg_seq = c->seq;
1476         hdr->sadb_msg_pid = c->pid;
1477
1478         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1479
1480         return 0;
1481 }
1482
1483 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1484 {
1485         struct xfrm_state *x;
1486         int err;
1487         struct km_event c;
1488
1489         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1490         if (IS_ERR(x))
1491                 return PTR_ERR(x);
1492
1493         xfrm_state_hold(x);
1494         if (hdr->sadb_msg_type == SADB_ADD)
1495                 err = xfrm_state_add(x);
1496         else
1497                 err = xfrm_state_update(x);
1498
1499         xfrm_audit_state_add(x, err ? 0 : 1,
1500                              audit_get_loginuid(current),
1501                              audit_get_sessionid(current), 0);
1502
1503         if (err < 0) {
1504                 x->km.state = XFRM_STATE_DEAD;
1505                 __xfrm_state_put(x);
1506                 goto out;
1507         }
1508
1509         if (hdr->sadb_msg_type == SADB_ADD)
1510                 c.event = XFRM_MSG_NEWSA;
1511         else
1512                 c.event = XFRM_MSG_UPDSA;
1513         c.seq = hdr->sadb_msg_seq;
1514         c.pid = hdr->sadb_msg_pid;
1515         km_state_notify(x, &c);
1516 out:
1517         xfrm_state_put(x);
1518         return err;
1519 }
1520
1521 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1522 {
1523         struct xfrm_state *x;
1524         struct km_event c;
1525         int err;
1526
1527         if (!ext_hdrs[SADB_EXT_SA-1] ||
1528             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1529                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1530                 return -EINVAL;
1531
1532         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1533         if (x == NULL)
1534                 return -ESRCH;
1535
1536         if ((err = security_xfrm_state_delete(x)))
1537                 goto out;
1538
1539         if (xfrm_state_kern(x)) {
1540                 err = -EPERM;
1541                 goto out;
1542         }
1543
1544         err = xfrm_state_delete(x);
1545
1546         if (err < 0)
1547                 goto out;
1548
1549         c.seq = hdr->sadb_msg_seq;
1550         c.pid = hdr->sadb_msg_pid;
1551         c.event = XFRM_MSG_DELSA;
1552         km_state_notify(x, &c);
1553 out:
1554         xfrm_audit_state_delete(x, err ? 0 : 1,
1555                                 audit_get_loginuid(current),
1556                                 audit_get_sessionid(current), 0);
1557         xfrm_state_put(x);
1558
1559         return err;
1560 }
1561
1562 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1563 {
1564         __u8 proto;
1565         struct sk_buff *out_skb;
1566         struct sadb_msg *out_hdr;
1567         struct xfrm_state *x;
1568
1569         if (!ext_hdrs[SADB_EXT_SA-1] ||
1570             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1571                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1572                 return -EINVAL;
1573
1574         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1575         if (x == NULL)
1576                 return -ESRCH;
1577
1578         out_skb = pfkey_xfrm_state2msg(x);
1579         proto = x->id.proto;
1580         xfrm_state_put(x);
1581         if (IS_ERR(out_skb))
1582                 return  PTR_ERR(out_skb);
1583
1584         out_hdr = (struct sadb_msg *) out_skb->data;
1585         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1586         out_hdr->sadb_msg_type = SADB_GET;
1587         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1588         out_hdr->sadb_msg_errno = 0;
1589         out_hdr->sadb_msg_reserved = 0;
1590         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1591         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1592         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1593
1594         return 0;
1595 }
1596
1597 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1598                                               gfp_t allocation)
1599 {
1600         struct sk_buff *skb;
1601         struct sadb_msg *hdr;
1602         int len, auth_len, enc_len, i;
1603
1604         auth_len = xfrm_count_auth_supported();
1605         if (auth_len) {
1606                 auth_len *= sizeof(struct sadb_alg);
1607                 auth_len += sizeof(struct sadb_supported);
1608         }
1609
1610         enc_len = xfrm_count_enc_supported();
1611         if (enc_len) {
1612                 enc_len *= sizeof(struct sadb_alg);
1613                 enc_len += sizeof(struct sadb_supported);
1614         }
1615
1616         len = enc_len + auth_len + sizeof(struct sadb_msg);
1617
1618         skb = alloc_skb(len + 16, allocation);
1619         if (!skb)
1620                 goto out_put_algs;
1621
1622         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1623         pfkey_hdr_dup(hdr, orig);
1624         hdr->sadb_msg_errno = 0;
1625         hdr->sadb_msg_len = len / sizeof(uint64_t);
1626
1627         if (auth_len) {
1628                 struct sadb_supported *sp;
1629                 struct sadb_alg *ap;
1630
1631                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1632                 ap = (struct sadb_alg *) (sp + 1);
1633
1634                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1635                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1636
1637                 for (i = 0; ; i++) {
1638                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1639                         if (!aalg)
1640                                 break;
1641                         if (aalg->available)
1642                                 *ap++ = aalg->desc;
1643                 }
1644         }
1645
1646         if (enc_len) {
1647                 struct sadb_supported *sp;
1648                 struct sadb_alg *ap;
1649
1650                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1651                 ap = (struct sadb_alg *) (sp + 1);
1652
1653                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1654                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1655
1656                 for (i = 0; ; i++) {
1657                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1658                         if (!ealg)
1659                                 break;
1660                         if (ealg->available)
1661                                 *ap++ = ealg->desc;
1662                 }
1663         }
1664
1665 out_put_algs:
1666         return skb;
1667 }
1668
1669 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1670 {
1671         struct pfkey_sock *pfk = pfkey_sk(sk);
1672         struct sk_buff *supp_skb;
1673
1674         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1675                 return -EINVAL;
1676
1677         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1678                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1679                         return -EEXIST;
1680                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1681         }
1682
1683         xfrm_probe_algs();
1684
1685         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1686         if (!supp_skb) {
1687                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1688                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1689
1690                 return -ENOBUFS;
1691         }
1692
1693         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1694
1695         return 0;
1696 }
1697
1698 static int key_notify_sa_flush(struct km_event *c)
1699 {
1700         struct sk_buff *skb;
1701         struct sadb_msg *hdr;
1702
1703         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1704         if (!skb)
1705                 return -ENOBUFS;
1706         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1707         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1708         hdr->sadb_msg_type = SADB_FLUSH;
1709         hdr->sadb_msg_seq = c->seq;
1710         hdr->sadb_msg_pid = c->pid;
1711         hdr->sadb_msg_version = PF_KEY_V2;
1712         hdr->sadb_msg_errno = (uint8_t) 0;
1713         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1714
1715         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1716
1717         return 0;
1718 }
1719
1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1721 {
1722         unsigned proto;
1723         struct km_event c;
1724         struct xfrm_audit audit_info;
1725         int err;
1726
1727         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1728         if (proto == 0)
1729                 return -EINVAL;
1730
1731         audit_info.loginuid = audit_get_loginuid(current);
1732         audit_info.sessionid = audit_get_sessionid(current);
1733         audit_info.secid = 0;
1734         err = xfrm_state_flush(proto, &audit_info);
1735         if (err)
1736                 return err;
1737         c.data.proto = proto;
1738         c.seq = hdr->sadb_msg_seq;
1739         c.pid = hdr->sadb_msg_pid;
1740         c.event = XFRM_MSG_FLUSHSA;
1741         km_state_notify(NULL, &c);
1742
1743         return 0;
1744 }
1745
1746 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1747 {
1748         struct pfkey_sock *pfk = ptr;
1749         struct sk_buff *out_skb;
1750         struct sadb_msg *out_hdr;
1751
1752         if (!pfkey_can_dump(&pfk->sk))
1753                 return -ENOBUFS;
1754
1755         out_skb = pfkey_xfrm_state2msg(x);
1756         if (IS_ERR(out_skb))
1757                 return PTR_ERR(out_skb);
1758
1759         out_hdr = (struct sadb_msg *) out_skb->data;
1760         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1761         out_hdr->sadb_msg_type = SADB_DUMP;
1762         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1763         out_hdr->sadb_msg_errno = 0;
1764         out_hdr->sadb_msg_reserved = 0;
1765         out_hdr->sadb_msg_seq = count + 1;
1766         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1767
1768         if (pfk->dump.skb)
1769                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1770                                 &pfk->sk);
1771         pfk->dump.skb = out_skb;
1772
1773         return 0;
1774 }
1775
1776 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1777 {
1778         return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
1779 }
1780
1781 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1782 {
1783         xfrm_state_walk_done(&pfk->dump.u.state);
1784 }
1785
1786 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1787 {
1788         u8 proto;
1789         struct pfkey_sock *pfk = pfkey_sk(sk);
1790
1791         if (pfk->dump.dump != NULL)
1792                 return -EBUSY;
1793
1794         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1795         if (proto == 0)
1796                 return -EINVAL;
1797
1798         pfk->dump.msg_version = hdr->sadb_msg_version;
1799         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1800         pfk->dump.dump = pfkey_dump_sa;
1801         pfk->dump.done = pfkey_dump_sa_done;
1802         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1803
1804         return pfkey_do_dump(pfk);
1805 }
1806
1807 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1808 {
1809         struct pfkey_sock *pfk = pfkey_sk(sk);
1810         int satype = hdr->sadb_msg_satype;
1811
1812         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1813                 /* XXX we mangle packet... */
1814                 hdr->sadb_msg_errno = 0;
1815                 if (satype != 0 && satype != 1)
1816                         return -EINVAL;
1817                 pfk->promisc = satype;
1818         }
1819         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1820         return 0;
1821 }
1822
1823 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1824 {
1825         int i;
1826         u32 reqid = *(u32*)ptr;
1827
1828         for (i=0; i<xp->xfrm_nr; i++) {
1829                 if (xp->xfrm_vec[i].reqid == reqid)
1830                         return -EEXIST;
1831         }
1832         return 0;
1833 }
1834
1835 static u32 gen_reqid(void)
1836 {
1837         struct xfrm_policy_walk walk;
1838         u32 start;
1839         int rc;
1840         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1841
1842         start = reqid;
1843         do {
1844                 ++reqid;
1845                 if (reqid == 0)
1846                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1847                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1848                 rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
1849                 xfrm_policy_walk_done(&walk);
1850                 if (rc != -EEXIST)
1851                         return reqid;
1852         } while (reqid != start);
1853         return 0;
1854 }
1855
1856 static int
1857 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1858 {
1859         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1860         int mode;
1861
1862         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1863                 return -ELOOP;
1864
1865         if (rq->sadb_x_ipsecrequest_mode == 0)
1866                 return -EINVAL;
1867
1868         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1869         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1870                 return -EINVAL;
1871         t->mode = mode;
1872         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1873                 t->optional = 1;
1874         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1875                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1876                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1877                         t->reqid = 0;
1878                 if (!t->reqid && !(t->reqid = gen_reqid()))
1879                         return -ENOBUFS;
1880         }
1881
1882         /* addresses present only in tunnel mode */
1883         if (t->mode == XFRM_MODE_TUNNEL) {
1884                 u8 *sa = (u8 *) (rq + 1);
1885                 int family, socklen;
1886
1887                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1888                                                 &t->saddr);
1889                 if (!family)
1890                         return -EINVAL;
1891
1892                 socklen = pfkey_sockaddr_len(family);
1893                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1894                                            &t->id.daddr) != family)
1895                         return -EINVAL;
1896                 t->encap_family = family;
1897         } else
1898                 t->encap_family = xp->family;
1899
1900         /* No way to set this via kame pfkey */
1901         t->allalgs = 1;
1902         xp->xfrm_nr++;
1903         return 0;
1904 }
1905
1906 static int
1907 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1908 {
1909         int err;
1910         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1911         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1912
1913         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1914                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1915                         return err;
1916                 len -= rq->sadb_x_ipsecrequest_len;
1917                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1918         }
1919         return 0;
1920 }
1921
1922 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1923 {
1924   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1925
1926         if (xfrm_ctx) {
1927                 int len = sizeof(struct sadb_x_sec_ctx);
1928                 len += xfrm_ctx->ctx_len;
1929                 return PFKEY_ALIGN8(len);
1930         }
1931         return 0;
1932 }
1933
1934 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1935 {
1936         struct xfrm_tmpl *t;
1937         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1938         int socklen = 0;
1939         int i;
1940
1941         for (i=0; i<xp->xfrm_nr; i++) {
1942                 t = xp->xfrm_vec + i;
1943                 socklen += pfkey_sockaddr_len(t->encap_family);
1944         }
1945
1946         return sizeof(struct sadb_msg) +
1947                 (sizeof(struct sadb_lifetime) * 3) +
1948                 (sizeof(struct sadb_address) * 2) +
1949                 (sockaddr_size * 2) +
1950                 sizeof(struct sadb_x_policy) +
1951                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1952                 (socklen * 2) +
1953                 pfkey_xfrm_policy2sec_ctx_size(xp);
1954 }
1955
1956 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1957 {
1958         struct sk_buff *skb;
1959         int size;
1960
1961         size = pfkey_xfrm_policy2msg_size(xp);
1962
1963         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1964         if (skb == NULL)
1965                 return ERR_PTR(-ENOBUFS);
1966
1967         return skb;
1968 }
1969
1970 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1971 {
1972         struct sadb_msg *hdr;
1973         struct sadb_address *addr;
1974         struct sadb_lifetime *lifetime;
1975         struct sadb_x_policy *pol;
1976         struct sadb_x_sec_ctx *sec_ctx;
1977         struct xfrm_sec_ctx *xfrm_ctx;
1978         int i;
1979         int size;
1980         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1981         int socklen = pfkey_sockaddr_len(xp->family);
1982
1983         size = pfkey_xfrm_policy2msg_size(xp);
1984
1985         /* call should fill header later */
1986         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1987         memset(hdr, 0, size);   /* XXX do we need this ? */
1988
1989         /* src address */
1990         addr = (struct sadb_address*) skb_put(skb,
1991                                               sizeof(struct sadb_address)+sockaddr_size);
1992         addr->sadb_address_len =
1993                 (sizeof(struct sadb_address)+sockaddr_size)/
1994                         sizeof(uint64_t);
1995         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1996         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1997         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1998         addr->sadb_address_reserved = 0;
1999         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2000                                  xp->selector.sport,
2001                                  (struct sockaddr *) (addr + 1),
2002                                  xp->family))
2003                 BUG();
2004
2005         /* dst address */
2006         addr = (struct sadb_address*) skb_put(skb,
2007                                               sizeof(struct sadb_address)+sockaddr_size);
2008         addr->sadb_address_len =
2009                 (sizeof(struct sadb_address)+sockaddr_size)/
2010                         sizeof(uint64_t);
2011         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2012         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2013         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2014         addr->sadb_address_reserved = 0;
2015
2016         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2017                             (struct sockaddr *) (addr + 1),
2018                             xp->family);
2019
2020         /* hard time */
2021         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2022                                                      sizeof(struct sadb_lifetime));
2023         lifetime->sadb_lifetime_len =
2024                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2025         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2026         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2027         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2028         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2029         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2030         /* soft time */
2031         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2032                                                      sizeof(struct sadb_lifetime));
2033         lifetime->sadb_lifetime_len =
2034                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2035         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2036         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2037         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2038         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2039         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2040         /* current time */
2041         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2042                                                      sizeof(struct sadb_lifetime));
2043         lifetime->sadb_lifetime_len =
2044                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2045         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2046         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2047         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2048         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2049         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2050
2051         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2052         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2053         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2054         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2055         if (xp->action == XFRM_POLICY_ALLOW) {
2056                 if (xp->xfrm_nr)
2057                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2058                 else
2059                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2060         }
2061         pol->sadb_x_policy_dir = dir+1;
2062         pol->sadb_x_policy_id = xp->index;
2063         pol->sadb_x_policy_priority = xp->priority;
2064
2065         for (i=0; i<xp->xfrm_nr; i++) {
2066                 struct sadb_x_ipsecrequest *rq;
2067                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2068                 int req_size;
2069                 int mode;
2070
2071                 req_size = sizeof(struct sadb_x_ipsecrequest);
2072                 if (t->mode == XFRM_MODE_TUNNEL) {
2073                         socklen = pfkey_sockaddr_len(t->encap_family);
2074                         req_size += socklen * 2;
2075                 } else {
2076                         size -= 2*socklen;
2077                         socklen = 0;
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(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.event = XFRM_MSG_DELPOLICY;
2344         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2345
2346 out:
2347         xfrm_pol_put(xp);
2348         return err;
2349 }
2350
2351 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2352 {
2353         int err;
2354         struct sk_buff *out_skb;
2355         struct sadb_msg *out_hdr;
2356         err = 0;
2357
2358         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2359         if (IS_ERR(out_skb)) {
2360                 err =  PTR_ERR(out_skb);
2361                 goto out;
2362         }
2363         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2364         if (err < 0)
2365                 goto out;
2366
2367         out_hdr = (struct sadb_msg *) out_skb->data;
2368         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2369         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2370         out_hdr->sadb_msg_satype = 0;
2371         out_hdr->sadb_msg_errno = 0;
2372         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2373         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2374         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2375         err = 0;
2376
2377 out:
2378         return err;
2379 }
2380
2381 #ifdef CONFIG_NET_KEY_MIGRATE
2382 static int pfkey_sockaddr_pair_size(sa_family_t family)
2383 {
2384         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2385 }
2386
2387 static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
2388                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2389                                u16 *family)
2390 {
2391         u8 *sa = (u8 *) (rq + 1);
2392         int af, socklen;
2393
2394         if (rq->sadb_x_ipsecrequest_len <
2395             pfkey_sockaddr_pair_size(((struct sockaddr *)sa)->sa_family))
2396                 return -EINVAL;
2397
2398         af = pfkey_sockaddr_extract((struct sockaddr *) sa,
2399                                     saddr);
2400         if (!af)
2401                 return -EINVAL;
2402
2403         socklen = pfkey_sockaddr_len(af);
2404         if (pfkey_sockaddr_extract((struct sockaddr *) (sa + socklen),
2405                                    daddr) != af)
2406                 return -EINVAL;
2407
2408         *family = af;
2409         return 0;
2410 }
2411
2412 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2413                                     struct xfrm_migrate *m)
2414 {
2415         int err;
2416         struct sadb_x_ipsecrequest *rq2;
2417         int mode;
2418
2419         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2420             len < rq1->sadb_x_ipsecrequest_len)
2421                 return -EINVAL;
2422
2423         /* old endoints */
2424         err = parse_sockaddr_pair(rq1, &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(rq2, &m->new_saddr, &m->new_daddr,
2438                                   &m->new_family);
2439         if (err)
2440                 return err;
2441
2442         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2443             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2444             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2445                 return -EINVAL;
2446
2447         m->proto = rq1->sadb_x_ipsecrequest_proto;
2448         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2449                 return -EINVAL;
2450         m->mode = mode;
2451         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2452
2453         return ((int)(rq1->sadb_x_ipsecrequest_len +
2454                       rq2->sadb_x_ipsecrequest_len));
2455 }
2456
2457 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2458                          struct sadb_msg *hdr, void **ext_hdrs)
2459 {
2460         int i, len, ret, err = -EINVAL;
2461         u8 dir;
2462         struct sadb_address *sa;
2463         struct sadb_x_policy *pol;
2464         struct sadb_x_ipsecrequest *rq;
2465         struct xfrm_selector sel;
2466         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2467
2468         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2469             ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2470             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2471                 err = -EINVAL;
2472                 goto out;
2473         }
2474
2475         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2476         if (!pol) {
2477                 err = -EINVAL;
2478                 goto out;
2479         }
2480
2481         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2482                 err = -EINVAL;
2483                 goto out;
2484         }
2485
2486         dir = pol->sadb_x_policy_dir - 1;
2487         memset(&sel, 0, sizeof(sel));
2488
2489         /* set source address info of selector */
2490         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2491         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2492         sel.prefixlen_s = sa->sadb_address_prefixlen;
2493         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2494         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2495         if (sel.sport)
2496                 sel.sport_mask = htons(0xffff);
2497
2498         /* set destination address info of selector */
2499         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2500         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2501         sel.prefixlen_d = sa->sadb_address_prefixlen;
2502         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2503         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2504         if (sel.dport)
2505                 sel.dport_mask = htons(0xffff);
2506
2507         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2508
2509         /* extract ipsecrequests */
2510         i = 0;
2511         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2512
2513         while (len > 0 && i < XFRM_MAX_DEPTH) {
2514                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2515                 if (ret < 0) {
2516                         err = ret;
2517                         goto out;
2518                 } else {
2519                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2520                         len -= ret;
2521                         i++;
2522                 }
2523         }
2524
2525         if (!i || len > 0) {
2526                 err = -EINVAL;
2527                 goto out;
2528         }
2529
2530         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
2531
2532  out:
2533         return err;
2534 }
2535 #else
2536 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2537                          struct sadb_msg *hdr, void **ext_hdrs)
2538 {
2539         return -ENOPROTOOPT;
2540 }
2541 #endif
2542
2543
2544 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2545 {
2546         unsigned int dir;
2547         int err = 0, delete;
2548         struct sadb_x_policy *pol;
2549         struct xfrm_policy *xp;
2550         struct km_event c;
2551
2552         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2553                 return -EINVAL;
2554
2555         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2556         if (dir >= XFRM_POLICY_MAX)
2557                 return -EINVAL;
2558
2559         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2560         xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2561                               delete, &err);
2562         if (xp == NULL)
2563                 return -ENOENT;
2564
2565         if (delete) {
2566                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2567                                 audit_get_loginuid(current),
2568                                 audit_get_sessionid(current), 0);
2569
2570                 if (err)
2571                         goto out;
2572                 c.seq = hdr->sadb_msg_seq;
2573                 c.pid = hdr->sadb_msg_pid;
2574                 c.data.byid = 1;
2575                 c.event = XFRM_MSG_DELPOLICY;
2576                 km_policy_notify(xp, dir, &c);
2577         } else {
2578                 err = key_pol_get_resp(sk, xp, hdr, dir);
2579         }
2580
2581 out:
2582         xfrm_pol_put(xp);
2583         return err;
2584 }
2585
2586 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2587 {
2588         struct pfkey_sock *pfk = ptr;
2589         struct sk_buff *out_skb;
2590         struct sadb_msg *out_hdr;
2591         int err;
2592
2593         if (!pfkey_can_dump(&pfk->sk))
2594                 return -ENOBUFS;
2595
2596         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2597         if (IS_ERR(out_skb))
2598                 return PTR_ERR(out_skb);
2599
2600         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2601         if (err < 0)
2602                 return err;
2603
2604         out_hdr = (struct sadb_msg *) out_skb->data;
2605         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2606         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2607         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2608         out_hdr->sadb_msg_errno = 0;
2609         out_hdr->sadb_msg_seq = count + 1;
2610         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2611
2612         if (pfk->dump.skb)
2613                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2614                                 &pfk->sk);
2615         pfk->dump.skb = out_skb;
2616
2617         return 0;
2618 }
2619
2620 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2621 {
2622         return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
2623 }
2624
2625 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2626 {
2627         xfrm_policy_walk_done(&pfk->dump.u.policy);
2628 }
2629
2630 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2631 {
2632         struct pfkey_sock *pfk = pfkey_sk(sk);
2633
2634         if (pfk->dump.dump != NULL)
2635                 return -EBUSY;
2636
2637         pfk->dump.msg_version = hdr->sadb_msg_version;
2638         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2639         pfk->dump.dump = pfkey_dump_sp;
2640         pfk->dump.done = pfkey_dump_sp_done;
2641         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2642
2643         return pfkey_do_dump(pfk);
2644 }
2645
2646 static int key_notify_policy_flush(struct km_event *c)
2647 {
2648         struct sk_buff *skb_out;
2649         struct sadb_msg *hdr;
2650
2651         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2652         if (!skb_out)
2653                 return -ENOBUFS;
2654         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2655         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2656         hdr->sadb_msg_seq = c->seq;
2657         hdr->sadb_msg_pid = c->pid;
2658         hdr->sadb_msg_version = PF_KEY_V2;
2659         hdr->sadb_msg_errno = (uint8_t) 0;
2660         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2661         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2662         return 0;
2663
2664 }
2665
2666 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2667 {
2668         struct km_event c;
2669         struct xfrm_audit audit_info;
2670         int err;
2671
2672         audit_info.loginuid = audit_get_loginuid(current);
2673         audit_info.sessionid = audit_get_sessionid(current);
2674         audit_info.secid = 0;
2675         err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
2676         if (err)
2677                 return err;
2678         c.data.type = XFRM_POLICY_TYPE_MAIN;
2679         c.event = XFRM_MSG_FLUSHPOLICY;
2680         c.pid = hdr->sadb_msg_pid;
2681         c.seq = hdr->sadb_msg_seq;
2682         km_policy_notify(NULL, 0, &c);
2683
2684         return 0;
2685 }
2686
2687 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2688                              struct sadb_msg *hdr, void **ext_hdrs);
2689 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2690         [SADB_RESERVED]         = pfkey_reserved,
2691         [SADB_GETSPI]           = pfkey_getspi,
2692         [SADB_UPDATE]           = pfkey_add,
2693         [SADB_ADD]              = pfkey_add,
2694         [SADB_DELETE]           = pfkey_delete,
2695         [SADB_GET]              = pfkey_get,
2696         [SADB_ACQUIRE]          = pfkey_acquire,
2697         [SADB_REGISTER]         = pfkey_register,
2698         [SADB_EXPIRE]           = NULL,
2699         [SADB_FLUSH]            = pfkey_flush,
2700         [SADB_DUMP]             = pfkey_dump,
2701         [SADB_X_PROMISC]        = pfkey_promisc,
2702         [SADB_X_PCHANGE]        = NULL,
2703         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2704         [SADB_X_SPDADD]         = pfkey_spdadd,
2705         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2706         [SADB_X_SPDGET]         = pfkey_spdget,
2707         [SADB_X_SPDACQUIRE]     = NULL,
2708         [SADB_X_SPDDUMP]        = pfkey_spddump,
2709         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2710         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2711         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2712         [SADB_X_MIGRATE]        = pfkey_migrate,
2713 };
2714
2715 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2716 {
2717         void *ext_hdrs[SADB_EXT_MAX];
2718         int err;
2719
2720         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2721                         BROADCAST_PROMISC_ONLY, NULL);
2722
2723         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2724         err = parse_exthdrs(skb, hdr, ext_hdrs);
2725         if (!err) {
2726                 err = -EOPNOTSUPP;
2727                 if (pfkey_funcs[hdr->sadb_msg_type])
2728                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2729         }
2730         return err;
2731 }
2732
2733 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2734 {
2735         struct sadb_msg *hdr = NULL;
2736
2737         if (skb->len < sizeof(*hdr)) {
2738                 *errp = -EMSGSIZE;
2739         } else {
2740                 hdr = (struct sadb_msg *) skb->data;
2741                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2742                     hdr->sadb_msg_reserved != 0 ||
2743                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2744                      hdr->sadb_msg_type > SADB_MAX)) {
2745                         hdr = NULL;
2746                         *errp = -EINVAL;
2747                 } else if (hdr->sadb_msg_len != (skb->len /
2748                                                  sizeof(uint64_t)) ||
2749                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2750                                                 sizeof(uint64_t))) {
2751                         hdr = NULL;
2752                         *errp = -EMSGSIZE;
2753                 } else {
2754                         *errp = 0;
2755                 }
2756         }
2757         return hdr;
2758 }
2759
2760 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2761 {
2762         unsigned int id = d->desc.sadb_alg_id;
2763
2764         if (id >= sizeof(t->aalgos) * 8)
2765                 return 0;
2766
2767         return (t->aalgos >> id) & 1;
2768 }
2769
2770 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2771 {
2772         unsigned int id = d->desc.sadb_alg_id;
2773
2774         if (id >= sizeof(t->ealgos) * 8)
2775                 return 0;
2776
2777         return (t->ealgos >> id) & 1;
2778 }
2779
2780 static int count_ah_combs(struct xfrm_tmpl *t)
2781 {
2782         int i, sz = 0;
2783
2784         for (i = 0; ; i++) {
2785                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2786                 if (!aalg)
2787                         break;
2788                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2789                         sz += sizeof(struct sadb_comb);
2790         }
2791         return sz + sizeof(struct sadb_prop);
2792 }
2793
2794 static int count_esp_combs(struct xfrm_tmpl *t)
2795 {
2796         int i, k, sz = 0;
2797
2798         for (i = 0; ; i++) {
2799                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2800                 if (!ealg)
2801                         break;
2802
2803                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2804                         continue;
2805
2806                 for (k = 1; ; k++) {
2807                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2808                         if (!aalg)
2809                                 break;
2810
2811                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2812                                 sz += sizeof(struct sadb_comb);
2813                 }
2814         }
2815         return sz + sizeof(struct sadb_prop);
2816 }
2817
2818 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2819 {
2820         struct sadb_prop *p;
2821         int i;
2822
2823         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2824         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2825         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2826         p->sadb_prop_replay = 32;
2827         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2828
2829         for (i = 0; ; i++) {
2830                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2831                 if (!aalg)
2832                         break;
2833
2834                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2835                         struct sadb_comb *c;
2836                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2837                         memset(c, 0, sizeof(*c));
2838                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2839                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2840                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2841                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2842                         c->sadb_comb_hard_addtime = 24*60*60;
2843                         c->sadb_comb_soft_addtime = 20*60*60;
2844                         c->sadb_comb_hard_usetime = 8*60*60;
2845                         c->sadb_comb_soft_usetime = 7*60*60;
2846                 }
2847         }
2848 }
2849
2850 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2851 {
2852         struct sadb_prop *p;
2853         int i, k;
2854
2855         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2856         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2857         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2858         p->sadb_prop_replay = 32;
2859         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2860
2861         for (i=0; ; i++) {
2862                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2863                 if (!ealg)
2864                         break;
2865
2866                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2867                         continue;
2868
2869                 for (k = 1; ; k++) {
2870                         struct sadb_comb *c;
2871                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2872                         if (!aalg)
2873                                 break;
2874                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2875                                 continue;
2876                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2877                         memset(c, 0, sizeof(*c));
2878                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2879                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2880                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2881                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2882                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2883                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2884                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2885                         c->sadb_comb_hard_addtime = 24*60*60;
2886                         c->sadb_comb_soft_addtime = 20*60*60;
2887                         c->sadb_comb_hard_usetime = 8*60*60;
2888                         c->sadb_comb_soft_usetime = 7*60*60;
2889                 }
2890         }
2891 }
2892
2893 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2894 {
2895         return 0;
2896 }
2897
2898 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2899 {
2900         struct sk_buff *out_skb;
2901         struct sadb_msg *out_hdr;
2902         int hard;
2903         int hsc;
2904
2905         hard = c->data.hard;
2906         if (hard)
2907                 hsc = 2;
2908         else
2909                 hsc = 1;
2910
2911         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2912         if (IS_ERR(out_skb))
2913                 return PTR_ERR(out_skb);
2914
2915         out_hdr = (struct sadb_msg *) out_skb->data;
2916         out_hdr->sadb_msg_version = PF_KEY_V2;
2917         out_hdr->sadb_msg_type = SADB_EXPIRE;
2918         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2919         out_hdr->sadb_msg_errno = 0;
2920         out_hdr->sadb_msg_reserved = 0;
2921         out_hdr->sadb_msg_seq = 0;
2922         out_hdr->sadb_msg_pid = 0;
2923
2924         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2925         return 0;
2926 }
2927
2928 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2929 {
2930         if (atomic_read(&pfkey_socks_nr) == 0)
2931                 return 0;
2932
2933         switch (c->event) {
2934         case XFRM_MSG_EXPIRE:
2935                 return key_notify_sa_expire(x, c);
2936         case XFRM_MSG_DELSA:
2937         case XFRM_MSG_NEWSA:
2938         case XFRM_MSG_UPDSA:
2939                 return key_notify_sa(x, c);
2940         case XFRM_MSG_FLUSHSA:
2941                 return key_notify_sa_flush(c);
2942         case XFRM_MSG_NEWAE: /* not yet supported */
2943                 break;
2944         default:
2945                 printk("pfkey: Unknown SA event %d\n", c->event);
2946                 break;
2947         }
2948
2949         return 0;
2950 }
2951
2952 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2953 {
2954         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2955                 return 0;
2956
2957         switch (c->event) {
2958         case XFRM_MSG_POLEXPIRE:
2959                 return key_notify_policy_expire(xp, c);
2960         case XFRM_MSG_DELPOLICY:
2961         case XFRM_MSG_NEWPOLICY:
2962         case XFRM_MSG_UPDPOLICY:
2963                 return key_notify_policy(xp, dir, c);
2964         case XFRM_MSG_FLUSHPOLICY:
2965                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2966                         break;
2967                 return key_notify_policy_flush(c);
2968         default:
2969                 printk("pfkey: Unknown policy event %d\n", c->event);
2970                 break;
2971         }
2972
2973         return 0;
2974 }
2975
2976 static u32 get_acqseq(void)
2977 {
2978         u32 res;
2979         static u32 acqseq;
2980         static DEFINE_SPINLOCK(acqseq_lock);
2981
2982         spin_lock_bh(&acqseq_lock);
2983         res = (++acqseq ? : ++acqseq);
2984         spin_unlock_bh(&acqseq_lock);
2985         return res;
2986 }
2987
2988 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2989 {
2990         struct sk_buff *skb;
2991         struct sadb_msg *hdr;
2992         struct sadb_address *addr;
2993         struct sadb_x_policy *pol;
2994         int sockaddr_size;
2995         int size;
2996         struct sadb_x_sec_ctx *sec_ctx;
2997         struct xfrm_sec_ctx *xfrm_ctx;
2998         int ctx_size = 0;
2999
3000         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3001         if (!sockaddr_size)
3002                 return -EINVAL;
3003
3004         size = sizeof(struct sadb_msg) +
3005                 (sizeof(struct sadb_address) * 2) +
3006                 (sockaddr_size * 2) +
3007                 sizeof(struct sadb_x_policy);
3008
3009         if (x->id.proto == IPPROTO_AH)
3010                 size += count_ah_combs(t);
3011         else if (x->id.proto == IPPROTO_ESP)
3012                 size += count_esp_combs(t);
3013
3014         if ((xfrm_ctx = x->security)) {
3015                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3016                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3017         }
3018
3019         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3020         if (skb == NULL)
3021                 return -ENOMEM;
3022
3023         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3024         hdr->sadb_msg_version = PF_KEY_V2;
3025         hdr->sadb_msg_type = SADB_ACQUIRE;
3026         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3027         hdr->sadb_msg_len = size / sizeof(uint64_t);
3028         hdr->sadb_msg_errno = 0;
3029         hdr->sadb_msg_reserved = 0;
3030         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3031         hdr->sadb_msg_pid = 0;
3032
3033         /* src address */
3034         addr = (struct sadb_address*) skb_put(skb,
3035                                               sizeof(struct sadb_address)+sockaddr_size);
3036         addr->sadb_address_len =
3037                 (sizeof(struct sadb_address)+sockaddr_size)/
3038                         sizeof(uint64_t);
3039         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3040         addr->sadb_address_proto = 0;
3041         addr->sadb_address_reserved = 0;
3042         addr->sadb_address_prefixlen =
3043                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3044                                     (struct sockaddr *) (addr + 1),
3045                                     x->props.family);
3046         if (!addr->sadb_address_prefixlen)
3047                 BUG();
3048
3049         /* dst address */
3050         addr = (struct sadb_address*) skb_put(skb,
3051                                               sizeof(struct sadb_address)+sockaddr_size);
3052         addr->sadb_address_len =
3053                 (sizeof(struct sadb_address)+sockaddr_size)/
3054                         sizeof(uint64_t);
3055         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3056         addr->sadb_address_proto = 0;
3057         addr->sadb_address_reserved = 0;
3058         addr->sadb_address_prefixlen =
3059                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3060                                     (struct sockaddr *) (addr + 1),
3061                                     x->props.family);
3062         if (!addr->sadb_address_prefixlen)
3063                 BUG();
3064
3065         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3066         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3067         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3068         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3069         pol->sadb_x_policy_dir = dir+1;
3070         pol->sadb_x_policy_id = xp->index;
3071
3072         /* Set sadb_comb's. */
3073         if (x->id.proto == IPPROTO_AH)
3074                 dump_ah_combs(skb, t);
3075         else if (x->id.proto == IPPROTO_ESP)
3076                 dump_esp_combs(skb, t);
3077
3078         /* security context */
3079         if (xfrm_ctx) {
3080                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3081                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3082                 sec_ctx->sadb_x_sec_len =
3083                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3084                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3085                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3086                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3087                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3088                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3089                        xfrm_ctx->ctx_len);
3090         }
3091
3092         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3093 }
3094
3095 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3096                                                 u8 *data, int len, int *dir)
3097 {
3098         struct xfrm_policy *xp;
3099         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3100         struct sadb_x_sec_ctx *sec_ctx;
3101
3102         switch (sk->sk_family) {
3103         case AF_INET:
3104                 if (opt != IP_IPSEC_POLICY) {
3105                         *dir = -EOPNOTSUPP;
3106                         return NULL;
3107                 }
3108                 break;
3109 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3110         case AF_INET6:
3111                 if (opt != IPV6_IPSEC_POLICY) {
3112                         *dir = -EOPNOTSUPP;
3113                         return NULL;
3114                 }
3115                 break;
3116 #endif
3117         default:
3118                 *dir = -EINVAL;
3119                 return NULL;
3120         }
3121
3122         *dir = -EINVAL;
3123
3124         if (len < sizeof(struct sadb_x_policy) ||
3125             pol->sadb_x_policy_len*8 > len ||
3126             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3127             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3128                 return NULL;
3129
3130         xp = xfrm_policy_alloc(GFP_ATOMIC);
3131         if (xp == NULL) {
3132                 *dir = -ENOBUFS;
3133                 return NULL;
3134         }
3135
3136         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3137                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3138
3139         xp->lft.soft_byte_limit = XFRM_INF;
3140         xp->lft.hard_byte_limit = XFRM_INF;
3141         xp->lft.soft_packet_limit = XFRM_INF;
3142         xp->lft.hard_packet_limit = XFRM_INF;
3143         xp->family = sk->sk_family;
3144
3145         xp->xfrm_nr = 0;
3146         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3147             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3148                 goto out;
3149
3150         /* security context too */
3151         if (len >= (pol->sadb_x_policy_len*8 +
3152             sizeof(struct sadb_x_sec_ctx))) {
3153                 char *p = (char *)pol;
3154                 struct xfrm_user_sec_ctx *uctx;
3155
3156                 p += pol->sadb_x_policy_len*8;
3157                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3158                 if (len < pol->sadb_x_policy_len*8 +
3159                     sec_ctx->sadb_x_sec_len) {
3160                         *dir = -EINVAL;
3161                         goto out;
3162                 }
3163                 if ((*dir = verify_sec_ctx_len(p)))
3164                         goto out;
3165                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3166                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3167                 kfree(uctx);
3168
3169                 if (*dir)
3170                         goto out;
3171         }
3172
3173         *dir = pol->sadb_x_policy_dir-1;
3174         return xp;
3175
3176 out:
3177         xfrm_policy_destroy(xp);
3178         return NULL;
3179 }
3180
3181 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3182 {
3183         struct sk_buff *skb;
3184         struct sadb_msg *hdr;
3185         struct sadb_sa *sa;
3186         struct sadb_address *addr;
3187         struct sadb_x_nat_t_port *n_port;
3188         int sockaddr_size;
3189         int size;
3190         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3191         struct xfrm_encap_tmpl *natt = NULL;
3192
3193         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3194         if (!sockaddr_size)
3195                 return -EINVAL;
3196
3197         if (!satype)
3198                 return -EINVAL;
3199
3200         if (!x->encap)
3201                 return -EINVAL;
3202
3203         natt = x->encap;
3204
3205         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3206          *
3207          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3208          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3209          */
3210
3211         size = sizeof(struct sadb_msg) +
3212                 sizeof(struct sadb_sa) +
3213                 (sizeof(struct sadb_address) * 2) +
3214                 (sockaddr_size * 2) +
3215                 (sizeof(struct sadb_x_nat_t_port) * 2);
3216
3217         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3218         if (skb == NULL)
3219                 return -ENOMEM;
3220
3221         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3222         hdr->sadb_msg_version = PF_KEY_V2;
3223         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3224         hdr->sadb_msg_satype = satype;
3225         hdr->sadb_msg_len = size / sizeof(uint64_t);
3226         hdr->sadb_msg_errno = 0;
3227         hdr->sadb_msg_reserved = 0;
3228         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3229         hdr->sadb_msg_pid = 0;
3230
3231         /* SA */
3232         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3233         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3234         sa->sadb_sa_exttype = SADB_EXT_SA;
3235         sa->sadb_sa_spi = x->id.spi;
3236         sa->sadb_sa_replay = 0;
3237         sa->sadb_sa_state = 0;
3238         sa->sadb_sa_auth = 0;
3239         sa->sadb_sa_encrypt = 0;
3240         sa->sadb_sa_flags = 0;
3241
3242         /* ADDRESS_SRC (old addr) */
3243         addr = (struct sadb_address*)
3244                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3245         addr->sadb_address_len =
3246                 (sizeof(struct sadb_address)+sockaddr_size)/
3247                         sizeof(uint64_t);
3248         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3249         addr->sadb_address_proto = 0;
3250         addr->sadb_address_reserved = 0;
3251         addr->sadb_address_prefixlen =
3252                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3253                                     (struct sockaddr *) (addr + 1),
3254                                     x->props.family);
3255         if (!addr->sadb_address_prefixlen)
3256                 BUG();
3257
3258         /* NAT_T_SPORT (old port) */
3259         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3260         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3261         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3262         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3263         n_port->sadb_x_nat_t_port_reserved = 0;
3264
3265         /* ADDRESS_DST (new addr) */
3266         addr = (struct sadb_address*)
3267                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3268         addr->sadb_address_len =
3269                 (sizeof(struct sadb_address)+sockaddr_size)/
3270                         sizeof(uint64_t);
3271         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3272         addr->sadb_address_proto = 0;
3273         addr->sadb_address_reserved = 0;
3274         addr->sadb_address_prefixlen =
3275                 pfkey_sockaddr_fill(ipaddr, 0,
3276                                     (struct sockaddr *) (addr + 1),
3277                                     x->props.family);
3278         if (!addr->sadb_address_prefixlen)
3279                 BUG();
3280
3281         /* NAT_T_DPORT (new port) */
3282         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3283         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3284         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3285         n_port->sadb_x_nat_t_port_port = sport;
3286         n_port->sadb_x_nat_t_port_reserved = 0;
3287
3288         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3289 }
3290
3291 #ifdef CONFIG_NET_KEY_MIGRATE
3292 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3293                             struct xfrm_selector *sel)
3294 {
3295         struct sadb_address *addr;
3296         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3297         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3298         addr->sadb_address_exttype = type;
3299         addr->sadb_address_proto = sel->proto;
3300         addr->sadb_address_reserved = 0;
3301
3302         switch (type) {
3303         case SADB_EXT_ADDRESS_SRC:
3304                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3305                 pfkey_sockaddr_fill(&sel->saddr, 0,
3306                                     (struct sockaddr *)(addr + 1),
3307                                     sel->family);
3308                 break;
3309         case SADB_EXT_ADDRESS_DST:
3310                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3311                 pfkey_sockaddr_fill(&sel->daddr, 0,
3312                                     (struct sockaddr *)(addr + 1),
3313                                     sel->family);
3314                 break;
3315         default:
3316                 return -EINVAL;
3317         }
3318
3319         return 0;
3320 }
3321
3322 static int set_ipsecrequest(struct sk_buff *skb,
3323                             uint8_t proto, uint8_t mode, int level,
3324                             uint32_t reqid, uint8_t family,
3325                             xfrm_address_t *src, xfrm_address_t *dst)
3326 {
3327         struct sadb_x_ipsecrequest *rq;
3328         u8 *sa;
3329         int socklen = pfkey_sockaddr_len(family);
3330         int size_req;
3331
3332         size_req = sizeof(struct sadb_x_ipsecrequest) +
3333                    pfkey_sockaddr_pair_size(family);
3334
3335         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3336         memset(rq, 0, size_req);
3337         rq->sadb_x_ipsecrequest_len = size_req;
3338         rq->sadb_x_ipsecrequest_proto = proto;
3339         rq->sadb_x_ipsecrequest_mode = mode;
3340         rq->sadb_x_ipsecrequest_level = level;
3341         rq->sadb_x_ipsecrequest_reqid = reqid;
3342
3343         sa = (u8 *) (rq + 1);
3344         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3345             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3346                 return -EINVAL;
3347
3348         return 0;
3349 }
3350 #endif
3351
3352 #ifdef CONFIG_NET_KEY_MIGRATE
3353 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3354                               struct xfrm_migrate *m, int num_bundles)
3355 {
3356         int i;
3357         int sasize_sel;
3358         int size = 0;
3359         int size_pol = 0;
3360         struct sk_buff *skb;
3361         struct sadb_msg *hdr;
3362         struct sadb_x_policy *pol;
3363         struct xfrm_migrate *mp;
3364
3365         if (type != XFRM_POLICY_TYPE_MAIN)
3366                 return 0;
3367
3368         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3369                 return -EINVAL;
3370
3371         /* selector */
3372         sasize_sel = pfkey_sockaddr_size(sel->family);
3373         if (!sasize_sel)
3374                 return -EINVAL;
3375         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3376
3377         /* policy info */
3378         size_pol += sizeof(struct sadb_x_policy);
3379
3380         /* ipsecrequests */
3381         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3382                 /* old locator pair */
3383                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3384                             pfkey_sockaddr_pair_size(mp->old_family);
3385                 /* new locator pair */
3386                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3387                             pfkey_sockaddr_pair_size(mp->new_family);
3388         }
3389
3390         size += sizeof(struct sadb_msg) + size_pol;
3391
3392         /* alloc buffer */
3393         skb = alloc_skb(size, GFP_ATOMIC);
3394         if (skb == NULL)
3395                 return -ENOMEM;
3396
3397         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3398         hdr->sadb_msg_version = PF_KEY_V2;
3399         hdr->sadb_msg_type = SADB_X_MIGRATE;
3400         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3401         hdr->sadb_msg_len = size / 8;
3402         hdr->sadb_msg_errno = 0;
3403         hdr->sadb_msg_reserved = 0;
3404         hdr->sadb_msg_seq = 0;
3405         hdr->sadb_msg_pid = 0;
3406
3407         /* selector src */
3408         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3409
3410         /* selector dst */
3411         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3412
3413         /* policy information */
3414         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3415         pol->sadb_x_policy_len = size_pol / 8;
3416         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3417         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3418         pol->sadb_x_policy_dir = dir + 1;
3419         pol->sadb_x_policy_id = 0;
3420         pol->sadb_x_policy_priority = 0;
3421
3422         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3423                 /* old ipsecrequest */
3424                 int mode = pfkey_mode_from_xfrm(mp->mode);
3425                 if (mode < 0)
3426                         goto err;
3427                 if (set_ipsecrequest(skb, mp->proto, mode,
3428                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3429                                      mp->reqid, mp->old_family,
3430                                      &mp->old_saddr, &mp->old_daddr) < 0)
3431                         goto err;
3432
3433                 /* new ipsecrequest */
3434                 if (set_ipsecrequest(skb, mp->proto, mode,
3435                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3436                                      mp->reqid, mp->new_family,
3437                                      &mp->new_saddr, &mp->new_daddr) < 0)
3438                         goto err;
3439         }
3440
3441         /* broadcast migrate message to sockets */
3442         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3443
3444         return 0;
3445
3446 err:
3447         kfree_skb(skb);
3448         return -EINVAL;
3449 }
3450 #else
3451 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3452                               struct xfrm_migrate *m, int num_bundles)
3453 {
3454         return -ENOPROTOOPT;
3455 }
3456 #endif
3457
3458 static int pfkey_sendmsg(struct kiocb *kiocb,
3459                          struct socket *sock, struct msghdr *msg, size_t len)
3460 {
3461         struct sock *sk = sock->sk;
3462         struct sk_buff *skb = NULL;
3463         struct sadb_msg *hdr = NULL;
3464         int err;
3465
3466         err = -EOPNOTSUPP;
3467         if (msg->msg_flags & MSG_OOB)
3468                 goto out;
3469
3470         err = -EMSGSIZE;
3471         if ((unsigned)len > sk->sk_sndbuf - 32)
3472                 goto out;
3473
3474         err = -ENOBUFS;
3475         skb = alloc_skb(len, GFP_KERNEL);
3476         if (skb == NULL)
3477                 goto out;
3478
3479         err = -EFAULT;
3480         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3481                 goto out;
3482
3483         hdr = pfkey_get_base_msg(skb, &err);
3484         if (!hdr)
3485                 goto out;
3486
3487         mutex_lock(&xfrm_cfg_mutex);
3488         err = pfkey_process(sk, skb, hdr);
3489         mutex_unlock(&xfrm_cfg_mutex);
3490
3491 out:
3492         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3493                 err = 0;
3494         if (skb)
3495                 kfree_skb(skb);
3496
3497         return err ? : len;
3498 }
3499
3500 static int pfkey_recvmsg(struct kiocb *kiocb,
3501                          struct socket *sock, struct msghdr *msg, size_t len,
3502                          int flags)
3503 {
3504         struct sock *sk = sock->sk;
3505         struct pfkey_sock *pfk = pfkey_sk(sk);
3506         struct sk_buff *skb;
3507         int copied, err;
3508
3509         err = -EINVAL;
3510         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3511                 goto out;
3512
3513         msg->msg_namelen = 0;
3514         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3515         if (skb == NULL)
3516                 goto out;
3517
3518         copied = skb->len;
3519         if (copied > len) {
3520                 msg->msg_flags |= MSG_TRUNC;
3521                 copied = len;
3522         }
3523
3524         skb_reset_transport_header(skb);
3525         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3526         if (err)
3527                 goto out_free;
3528
3529         sock_recv_timestamp(msg, sk, skb);
3530
3531         err = (flags & MSG_TRUNC) ? skb->len : copied;
3532
3533         if (pfk->dump.dump != NULL &&
3534             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3535                 pfkey_do_dump(pfk);
3536
3537 out_free:
3538         skb_free_datagram(sk, skb);
3539 out:
3540         return err;
3541 }
3542
3543 static const struct proto_ops pfkey_ops = {
3544         .family         =       PF_KEY,
3545         .owner          =       THIS_MODULE,
3546         /* Operations that make no sense on pfkey sockets. */
3547         .bind           =       sock_no_bind,
3548         .connect        =       sock_no_connect,
3549         .socketpair     =       sock_no_socketpair,
3550         .accept         =       sock_no_accept,
3551         .getname        =       sock_no_getname,
3552         .ioctl          =       sock_no_ioctl,
3553         .listen         =       sock_no_listen,
3554         .shutdown       =       sock_no_shutdown,
3555         .setsockopt     =       sock_no_setsockopt,
3556         .getsockopt     =       sock_no_getsockopt,
3557         .mmap           =       sock_no_mmap,
3558         .sendpage       =       sock_no_sendpage,
3559
3560         /* Now the operations that really occur. */
3561         .release        =       pfkey_release,
3562         .poll           =       datagram_poll,
3563         .sendmsg        =       pfkey_sendmsg,
3564         .recvmsg        =       pfkey_recvmsg,
3565 };
3566
3567 static struct net_proto_family pfkey_family_ops = {
3568         .family =       PF_KEY,
3569         .create =       pfkey_create,
3570         .owner  =       THIS_MODULE,
3571 };
3572
3573 #ifdef CONFIG_PROC_FS
3574 static int pfkey_seq_show(struct seq_file *f, void *v)
3575 {
3576         struct sock *s;
3577
3578         s = (struct sock *)v;
3579         if (v == SEQ_START_TOKEN)
3580                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3581         else
3582                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3583                                s,
3584                                atomic_read(&s->sk_refcnt),
3585                                atomic_read(&s->sk_rmem_alloc),
3586                                atomic_read(&s->sk_wmem_alloc),
3587                                sock_i_uid(s),
3588                                sock_i_ino(s)
3589                                );
3590         return 0;
3591 }
3592
3593 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3594 {
3595         struct sock *s;
3596         struct hlist_node *node;
3597         loff_t pos = *ppos;
3598
3599         read_lock(&pfkey_table_lock);
3600         if (pos == 0)
3601                 return SEQ_START_TOKEN;
3602
3603         sk_for_each(s, node, &pfkey_table)
3604                 if (pos-- == 1)
3605                         return s;
3606
3607         return NULL;
3608 }
3609
3610 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3611 {
3612         ++*ppos;
3613         return (v == SEQ_START_TOKEN) ?
3614                 sk_head(&pfkey_table) :
3615                         sk_next((struct sock *)v);
3616 }
3617
3618 static void pfkey_seq_stop(struct seq_file *f, void *v)
3619 {
3620         read_unlock(&pfkey_table_lock);
3621 }
3622
3623 static struct seq_operations pfkey_seq_ops = {
3624         .start  = pfkey_seq_start,
3625         .next   = pfkey_seq_next,
3626         .stop   = pfkey_seq_stop,
3627         .show   = pfkey_seq_show,
3628 };
3629
3630 static int pfkey_seq_open(struct inode *inode, struct file *file)
3631 {
3632         return seq_open(file, &pfkey_seq_ops);
3633 }
3634
3635 static struct file_operations pfkey_proc_ops = {
3636         .open    = pfkey_seq_open,
3637         .read    = seq_read,
3638         .llseek  = seq_lseek,
3639         .release = seq_release,
3640 };
3641
3642 static int pfkey_init_proc(void)
3643 {
3644         struct proc_dir_entry *e;
3645
3646         e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3647         if (e == NULL)
3648                 return -ENOMEM;
3649
3650         return 0;
3651 }
3652
3653 static void pfkey_exit_proc(void)
3654 {
3655         proc_net_remove(&init_net, "pfkey");
3656 }
3657 #else
3658 static inline int pfkey_init_proc(void)
3659 {
3660         return 0;
3661 }
3662
3663 static inline void pfkey_exit_proc(void)
3664 {
3665 }
3666 #endif
3667
3668 static struct xfrm_mgr pfkeyv2_mgr =
3669 {
3670         .id             = "pfkeyv2",
3671         .notify         = pfkey_send_notify,
3672         .acquire        = pfkey_send_acquire,
3673         .compile_policy = pfkey_compile_policy,
3674         .new_mapping    = pfkey_send_new_mapping,
3675         .notify_policy  = pfkey_send_policy_notify,
3676         .migrate        = pfkey_send_migrate,
3677 };
3678
3679 static void __exit ipsec_pfkey_exit(void)
3680 {
3681         xfrm_unregister_km(&pfkeyv2_mgr);
3682         pfkey_exit_proc();
3683         sock_unregister(PF_KEY);
3684         proto_unregister(&key_proto);
3685 }
3686
3687 static int __init ipsec_pfkey_init(void)
3688 {
3689         int err = proto_register(&key_proto, 0);
3690
3691         if (err != 0)
3692                 goto out;
3693
3694         err = sock_register(&pfkey_family_ops);
3695         if (err != 0)
3696                 goto out_unregister_key_proto;
3697         err = pfkey_init_proc();
3698         if (err != 0)
3699                 goto out_sock_unregister;
3700         err = xfrm_register_km(&pfkeyv2_mgr);
3701         if (err != 0)
3702                 goto out_remove_proc_entry;
3703 out:
3704         return err;
3705 out_remove_proc_entry:
3706         pfkey_exit_proc();
3707 out_sock_unregister:
3708         sock_unregister(PF_KEY);
3709 out_unregister_key_proto:
3710         proto_unregister(&key_proto);
3711         goto out;
3712 }
3713
3714 module_init(ipsec_pfkey_init);
3715 module_exit(ipsec_pfkey_exit);
3716 MODULE_LICENSE("GPL");
3717 MODULE_ALIAS_NETPROTO(PF_KEY);