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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         } dump;
  62 };
  63
  64 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  65 {
  66         return (struct pfkey_sock *)sk;
  67 }
  68
  69 static int pfkey_can_dump(struct sock *sk)
  70 {
  71         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  72                 return 1;
  73         return 0;
  74 }
  75
  76 static int pfkey_do_dump(struct pfkey_sock *pfk)
  77 {
  78         int rc;
  79
  80         rc = pfk->dump.dump(pfk);
  81         if (rc == -ENOBUFS)
  82                 return 0;
  83
  84         pfk->dump.done(pfk);
  85         pfk->dump.dump = NULL;
  86         pfk->dump.done = NULL;
  87         return rc;
  88 }
  89
  90 static void pfkey_sock_destruct(struct sock *sk)
  91 {
  92         skb_queue_purge(&sk->sk_receive_queue);
  93
  94         if (!sock_flag(sk, SOCK_DEAD)) {
  95                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  96                 return;
  97         }
  98
  99         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
 100         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
 101
 102         atomic_dec(&pfkey_socks_nr);
 103 }
 104
 105 static void pfkey_table_grab(void)
 106 {
 107         write_lock_bh(&pfkey_table_lock);
 108
 109         if (atomic_read(&pfkey_table_users)) {
 110                 DECLARE_WAITQUEUE(wait, current);
 111
 112                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
 113                 for(;;) {
 114                         set_current_state(TASK_UNINTERRUPTIBLE);
 115                         if (atomic_read(&pfkey_table_users) == 0)
 116                                 break;
 117                         write_unlock_bh(&pfkey_table_lock);
 118                         schedule();
 119                         write_lock_bh(&pfkey_table_lock);
 120                 }
 121
 122                 __set_current_state(TASK_RUNNING);
 123                 remove_wait_queue(&pfkey_table_wait, &wait);
 124         }
 125 }
 126
 127 static __inline__ void pfkey_table_ungrab(void)
 128 {
 129         write_unlock_bh(&pfkey_table_lock);
 130         wake_up(&pfkey_table_wait);
 131 }
 132
 133 static __inline__ void pfkey_lock_table(void)
 134 {
 135         /* read_lock() synchronizes us to pfkey_table_grab */
 136
 137         read_lock(&pfkey_table_lock);
 138         atomic_inc(&pfkey_table_users);
 139         read_unlock(&pfkey_table_lock);
 140 }
 141
 142 static __inline__ void pfkey_unlock_table(void)
 143 {
 144         if (atomic_dec_and_test(&pfkey_table_users))
 145                 wake_up(&pfkey_table_wait);
 146 }
 147
 148
 149 static const struct proto_ops pfkey_ops;
 150
 151 static void pfkey_insert(struct sock *sk)
 152 {
 153         pfkey_table_grab();
 154         sk_add_node(sk, &pfkey_table);
 155         pfkey_table_ungrab();
 156 }
 157
 158 static void pfkey_remove(struct sock *sk)
 159 {
 160         pfkey_table_grab();
 161         sk_del_node_init(sk);
 162         pfkey_table_ungrab();
 163 }
 164
 165 static struct proto key_proto = {
 166         .name     = "KEY",
 167         .owner    = THIS_MODULE,
 168         .obj_size = sizeof(struct pfkey_sock),
 169 };
 170
 171 static int pfkey_create(struct net *net, struct socket *sock, int protocol)
 172 {
 173         struct sock *sk;
 174         int err;
 175
 176         if (net != &init_net)
 177                 return -EAFNOSUPPORT;
 178
 179         if (!capable(CAP_NET_ADMIN))
 180                 return -EPERM;
 181         if (sock->type != SOCK_RAW)
 182                 return -ESOCKTNOSUPPORT;
 183         if (protocol != PF_KEY_V2)
 184                 return -EPROTONOSUPPORT;
 185
 186         err = -ENOMEM;
 187         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 188         if (sk == NULL)
 189                 goto out;
 190
 191         sock->ops = &pfkey_ops;
 192         sock_init_data(sock, sk);
 193
 194         sk->sk_family = PF_KEY;
 195         sk->sk_destruct = pfkey_sock_destruct;
 196
 197         atomic_inc(&pfkey_socks_nr);
 198
 199         pfkey_insert(sk);
 200
 201         return 0;
 202 out:
 203         return err;
 204 }
 205
 206 static int pfkey_release(struct socket *sock)
 207 {
 208         struct sock *sk = sock->sk;
 209
 210         if (!sk)
 211                 return 0;
 212
 213         pfkey_remove(sk);
 214
 215         sock_orphan(sk);
 216         sock->sk = NULL;
 217         skb_queue_purge(&sk->sk_write_queue);
 218         sock_put(sk);
 219
 220         return 0;
 221 }
 222
 223 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 224                                gfp_t allocation, struct sock *sk)
 225 {
 226         int err = -ENOBUFS;
 227
 228         sock_hold(sk);
 229         if (*skb2 == NULL) {
 230                 if (atomic_read(&skb->users) != 1) {
 231                         *skb2 = skb_clone(skb, allocation);
 232                 } else {
 233                         *skb2 = skb;
 234                         atomic_inc(&skb->users);
 235                 }
 236         }
 237         if (*skb2 != NULL) {
 238                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 239                         skb_orphan(*skb2);
 240                         skb_set_owner_r(*skb2, sk);
 241                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 242                         sk->sk_data_ready(sk, (*skb2)->len);
 243                         *skb2 = NULL;
 244                         err = 0;
 245                 }
 246         }
 247         sock_put(sk);
 248         return err;
 249 }
 250
 251 /* Send SKB to all pfkey sockets matching selected criteria.  */
 252 #define BROADCAST_ALL           0
 253 #define BROADCAST_ONE           1
 254 #define BROADCAST_REGISTERED    2
 255 #define BROADCAST_PROMISC_ONLY  4
 256 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 257                            int broadcast_flags, struct sock *one_sk)
 258 {
 259         struct sock *sk;
 260         struct hlist_node *node;
 261         struct sk_buff *skb2 = NULL;
 262         int err = -ESRCH;
 263
 264         /* XXX Do we need something like netlink_overrun?  I think
 265          * XXX PF_KEY socket apps will not mind current behavior.
 266          */
 267         if (!skb)
 268                 return -ENOMEM;
 269
 270         pfkey_lock_table();
 271         sk_for_each(sk, node, &pfkey_table) {
 272                 struct pfkey_sock *pfk = pfkey_sk(sk);
 273                 int err2;
 274
 275                 /* Yes, it means that if you are meant to receive this
 276                  * pfkey message you receive it twice as promiscuous
 277                  * socket.
 278                  */
 279                 if (pfk->promisc)
 280                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 281
 282                 /* the exact target will be processed later */
 283                 if (sk == one_sk)
 284                         continue;
 285                 if (broadcast_flags != BROADCAST_ALL) {
 286                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 287                                 continue;
 288                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 289                             !pfk->registered)
 290                                 continue;
 291                         if (broadcast_flags & BROADCAST_ONE)
 292                                 continue;
 293                 }
 294
 295                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 296
 297                 /* Error is cleare after succecful sending to at least one
 298                  * registered KM */
 299                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 300                         err = err2;
 301         }
 302         pfkey_unlock_table();
 303
 304         if (one_sk != NULL)
 305                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 306
 307         if (skb2)
 308                 kfree_skb(skb2);
 309         kfree_skb(skb);
 310         return err;
 311 }
 312
 313 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 314 {
 315         *new = *orig;
 316 }
 317
 318 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 319 {
 320         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 321         struct sadb_msg *hdr;
 322
 323         if (!skb)
 324                 return -ENOBUFS;
 325
 326         /* Woe be to the platform trying to support PFKEY yet
 327          * having normal errnos outside the 1-255 range, inclusive.
 328          */
 329         err = -err;
 330         if (err == ERESTARTSYS ||
 331             err == ERESTARTNOHAND ||
 332             err == ERESTARTNOINTR)
 333                 err = EINTR;
 334         if (err >= 512)
 335                 err = EINVAL;
 336         BUG_ON(err <= 0 || err >= 256);
 337
 338         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 339         pfkey_hdr_dup(hdr, orig);
 340         hdr->sadb_msg_errno = (uint8_t) err;
 341         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 342                              sizeof(uint64_t));
 343
 344         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 345
 346         return 0;
 347 }
 348
 349 static u8 sadb_ext_min_len[] = {
 350         [SADB_EXT_RESERVED]             = (u8) 0,
 351         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 352         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 353         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 354         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 355         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 356         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 357         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 358         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 359         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 360         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 361         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 362         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 363         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 364         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 365         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 366         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 367         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 368         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 369         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 370         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 371         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 372         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 373         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 374         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 375 };
 376
 377 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 378 static int verify_address_len(void *p)
 379 {
 380         struct sadb_address *sp = p;
 381         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 382         struct sockaddr_in *sin;
 383 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 384         struct sockaddr_in6 *sin6;
 385 #endif
 386         int len;
 387
 388         switch (addr->sa_family) {
 389         case AF_INET:
 390                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 391                 if (sp->sadb_address_len != len ||
 392                     sp->sadb_address_prefixlen > 32)
 393                         return -EINVAL;
 394                 break;
 395 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 396         case AF_INET6:
 397                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 398                 if (sp->sadb_address_len != len ||
 399                     sp->sadb_address_prefixlen > 128)
 400                         return -EINVAL;
 401                 break;
 402 #endif
 403         default:
 404                 /* It is user using kernel to keep track of security
 405                  * associations for another protocol, such as
 406                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 407                  * lengths.
 408                  *
 409                  * XXX Actually, association/policy database is not yet
 410                  * XXX able to cope with arbitrary sockaddr families.
 411                  * XXX When it can, remove this -EINVAL.  -DaveM
 412                  */
 413                 return -EINVAL;
 414                 break;
 415         }
 416
 417         return 0;
 418 }
 419
 420 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 421 {
 422         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 423                             sec_ctx->sadb_x_ctx_len,
 424                             sizeof(uint64_t));
 425 }
 426
 427 static inline int verify_sec_ctx_len(void *p)
 428 {
 429         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 430         int len = sec_ctx->sadb_x_ctx_len;
 431
 432         if (len > PAGE_SIZE)
 433                 return -EINVAL;
 434
 435         len = pfkey_sec_ctx_len(sec_ctx);
 436
 437         if (sec_ctx->sadb_x_sec_len != len)
 438                 return -EINVAL;
 439
 440         return 0;
 441 }
 442
 443 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 444 {
 445         struct xfrm_user_sec_ctx *uctx = NULL;
 446         int ctx_size = sec_ctx->sadb_x_ctx_len;
 447
 448         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 449
 450         if (!uctx)
 451                 return NULL;
 452
 453         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 454         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 455         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 456         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 457         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 458         memcpy(uctx + 1, sec_ctx + 1,
 459                uctx->ctx_len);
 460
 461         return uctx;
 462 }
 463
 464 static int present_and_same_family(struct sadb_address *src,
 465                                    struct sadb_address *dst)
 466 {
 467         struct sockaddr *s_addr, *d_addr;
 468
 469         if (!src || !dst)
 470                 return 0;
 471
 472         s_addr = (struct sockaddr *)(src + 1);
 473         d_addr = (struct sockaddr *)(dst + 1);
 474         if (s_addr->sa_family != d_addr->sa_family)
 475                 return 0;
 476         if (s_addr->sa_family != AF_INET
 477 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 478             && s_addr->sa_family != AF_INET6
 479 #endif
 480                 )
 481                 return 0;
 482
 483         return 1;
 484 }
 485
 486 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 487 {
 488         char *p = (char *) hdr;
 489         int len = skb->len;
 490
 491         len -= sizeof(*hdr);
 492         p += sizeof(*hdr);
 493         while (len > 0) {
 494                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 495                 uint16_t ext_type;
 496                 int ext_len;
 497
 498                 ext_len  = ehdr->sadb_ext_len;
 499                 ext_len *= sizeof(uint64_t);
 500                 ext_type = ehdr->sadb_ext_type;
 501                 if (ext_len < sizeof(uint64_t) ||
 502                     ext_len > len ||
 503                     ext_type == SADB_EXT_RESERVED)
 504                         return -EINVAL;
 505
 506                 if (ext_type <= SADB_EXT_MAX) {
 507                         int min = (int) sadb_ext_min_len[ext_type];
 508                         if (ext_len < min)
 509                                 return -EINVAL;
 510                         if (ext_hdrs[ext_type-1] != NULL)
 511                                 return -EINVAL;
 512                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 513                             ext_type == SADB_EXT_ADDRESS_DST ||
 514                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 515                             ext_type == SADB_X_EXT_NAT_T_OA) {
 516                                 if (verify_address_len(p))
 517                                         return -EINVAL;
 518                         }
 519                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 520                                 if (verify_sec_ctx_len(p))
 521                                         return -EINVAL;
 522                         }
 523                         ext_hdrs[ext_type-1] = p;
 524                 }
 525                 p   += ext_len;
 526                 len -= ext_len;
 527         }
 528
 529         return 0;
 530 }
 531
 532 static uint16_t
 533 pfkey_satype2proto(uint8_t satype)
 534 {
 535         switch (satype) {
 536         case SADB_SATYPE_UNSPEC:
 537                 return IPSEC_PROTO_ANY;
 538         case SADB_SATYPE_AH:
 539                 return IPPROTO_AH;
 540         case SADB_SATYPE_ESP:
 541                 return IPPROTO_ESP;
 542         case SADB_X_SATYPE_IPCOMP:
 543                 return IPPROTO_COMP;
 544                 break;
 545         default:
 546                 return 0;
 547         }
 548         /* NOTREACHED */
 549 }
 550
 551 static uint8_t
 552 pfkey_proto2satype(uint16_t proto)
 553 {
 554         switch (proto) {
 555         case IPPROTO_AH:
 556                 return SADB_SATYPE_AH;
 557         case IPPROTO_ESP:
 558                 return SADB_SATYPE_ESP;
 559         case IPPROTO_COMP:
 560                 return SADB_X_SATYPE_IPCOMP;
 561                 break;
 562         default:
 563                 return 0;
 564         }
 565         /* NOTREACHED */
 566 }
 567
 568 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 569  * say specifically 'just raw sockets' as we encode them as 255.
 570  */
 571
 572 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 573 {
 574         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 575 }
 576
 577 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 578 {
 579         return (proto ? proto : IPSEC_PROTO_ANY);
 580 }
 581
 582 static inline int pfkey_sockaddr_len(sa_family_t family)
 583 {
 584         switch (family) {
 585         case AF_INET:
 586                 return sizeof(struct sockaddr_in);
 587 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 588         case AF_INET6:
 589                 return sizeof(struct sockaddr_in6);
 590 #endif
 591         }
 592         return 0;
 593 }
 594
 595 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 596                                      xfrm_address_t *xaddr)
 597 {
 598         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 599         case AF_INET:
 600                 xaddr->a4 =
 601                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 602                 return AF_INET;
 603 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 604         case AF_INET6:
 605                 memcpy(xaddr->a6,
 606                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 607                        sizeof(struct in6_addr));
 608                 return AF_INET6;
 609 #endif
 610         default:
 611                 return 0;
 612         }
 613         /* NOTREACHED */
 614 }
 615
 616 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 617 {
 618         struct sadb_sa *sa;
 619         struct sadb_address *addr;
 620         uint16_t proto;
 621         unsigned short family;
 622         xfrm_address_t *xaddr;
 623
 624         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 625         if (sa == NULL)
 626                 return NULL;
 627
 628         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 629         if (proto == 0)
 630                 return NULL;
 631
 632         /* sadb_address_len should be checked by caller */
 633         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 634         if (addr == NULL)
 635                 return NULL;
 636
 637         family = ((struct sockaddr *)(addr + 1))->sa_family;
 638         switch (family) {
 639         case AF_INET:
 640                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 641                 break;
 642 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 643         case AF_INET6:
 644                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 645                 break;
 646 #endif
 647         default:
 648                 xaddr = NULL;
 649         }
 650
 651         if (!xaddr)
 652                 return NULL;
 653
 654         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 655 }
 656
 657 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 658
 659 static int
 660 pfkey_sockaddr_size(sa_family_t family)
 661 {
 662         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 663 }
 664
 665 static inline int pfkey_mode_from_xfrm(int mode)
 666 {
 667         switch(mode) {
 668         case XFRM_MODE_TRANSPORT:
 669                 return IPSEC_MODE_TRANSPORT;
 670         case XFRM_MODE_TUNNEL:
 671                 return IPSEC_MODE_TUNNEL;
 672         case XFRM_MODE_BEET:
 673                 return IPSEC_MODE_BEET;
 674         default:
 675                 return -1;
 676         }
 677 }
 678
 679 static inline int pfkey_mode_to_xfrm(int mode)
 680 {
 681         switch(mode) {
 682         case IPSEC_MODE_ANY:    /*XXX*/
 683         case IPSEC_MODE_TRANSPORT:
 684                 return XFRM_MODE_TRANSPORT;
 685         case IPSEC_MODE_TUNNEL:
 686                 return XFRM_MODE_TUNNEL;
 687         case IPSEC_MODE_BEET:
 688                 return XFRM_MODE_BEET;
 689         default:
 690                 return -1;
 691         }
 692 }
 693
 694 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
 695                                        struct sockaddr *sa,
 696                                        unsigned short family)
 697 {
 698         switch (family) {
 699         case AF_INET:
 700             {
 701                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 702                 sin->sin_family = AF_INET;
 703                 sin->sin_port = port;
 704                 sin->sin_addr.s_addr = xaddr->a4;
 705                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 706                 return 32;
 707             }
 708 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 709         case AF_INET6:
 710             {
 711                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 712                 sin6->sin6_family = AF_INET6;
 713                 sin6->sin6_port = port;
 714                 sin6->sin6_flowinfo = 0;
 715                 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
 716                 sin6->sin6_scope_id = 0;
 717                 return 128;
 718             }
 719 #endif
 720         }
 721         return 0;
 722 }
 723
 724 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
 725                                               int add_keys, int hsc)
 726 {
 727         struct sk_buff *skb;
 728         struct sadb_msg *hdr;
 729         struct sadb_sa *sa;
 730         struct sadb_lifetime *lifetime;
 731         struct sadb_address *addr;
 732         struct sadb_key *key;
 733         struct sadb_x_sa2 *sa2;
 734         struct sadb_x_sec_ctx *sec_ctx;
 735         struct xfrm_sec_ctx *xfrm_ctx;
 736         int ctx_size = 0;
 737         int size;
 738         int auth_key_size = 0;
 739         int encrypt_key_size = 0;
 740         int sockaddr_size;
 741         struct xfrm_encap_tmpl *natt = NULL;
 742         int mode;
 743
 744         /* address family check */
 745         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 746         if (!sockaddr_size)
 747                 return ERR_PTR(-EINVAL);
 748
 749         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 750            key(AE), (identity(SD),) (sensitivity)> */
 751         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 752                 sizeof(struct sadb_lifetime) +
 753                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 754                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 755                         sizeof(struct sadb_address)*2 +
 756                                 sockaddr_size*2 +
 757                                         sizeof(struct sadb_x_sa2);
 758
 759         if ((xfrm_ctx = x->security)) {
 760                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 761                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 762         }
 763
 764         /* identity & sensitivity */
 765
 766         if ((x->props.family == AF_INET &&
 767              x->sel.saddr.a4 != x->props.saddr.a4)
 768 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 769             || (x->props.family == AF_INET6 &&
 770                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 771 #endif
 772                 )
 773                 size += sizeof(struct sadb_address) + sockaddr_size;
 774
 775         if (add_keys) {
 776                 if (x->aalg && x->aalg->alg_key_len) {
 777                         auth_key_size =
 778                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 779                         size += sizeof(struct sadb_key) + auth_key_size;
 780                 }
 781                 if (x->ealg && x->ealg->alg_key_len) {
 782                         encrypt_key_size =
 783                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 784                         size += sizeof(struct sadb_key) + encrypt_key_size;
 785                 }
 786         }
 787         if (x->encap)
 788                 natt = x->encap;
 789
 790         if (natt && natt->encap_type) {
 791                 size += sizeof(struct sadb_x_nat_t_type);
 792                 size += sizeof(struct sadb_x_nat_t_port);
 793                 size += sizeof(struct sadb_x_nat_t_port);
 794         }
 795
 796         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 797         if (skb == NULL)
 798                 return ERR_PTR(-ENOBUFS);
 799
 800         /* call should fill header later */
 801         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 802         memset(hdr, 0, size);   /* XXX do we need this ? */
 803         hdr->sadb_msg_len = size / sizeof(uint64_t);
 804
 805         /* sa */
 806         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 807         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 808         sa->sadb_sa_exttype = SADB_EXT_SA;
 809         sa->sadb_sa_spi = x->id.spi;
 810         sa->sadb_sa_replay = x->props.replay_window;
 811         switch (x->km.state) {
 812         case XFRM_STATE_VALID:
 813                 sa->sadb_sa_state = x->km.dying ?
 814                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 815                 break;
 816         case XFRM_STATE_ACQ:
 817                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 818                 break;
 819         default:
 820                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 821                 break;
 822         }
 823         sa->sadb_sa_auth = 0;
 824         if (x->aalg) {
 825                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 826                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 827         }
 828         sa->sadb_sa_encrypt = 0;
 829         BUG_ON(x->ealg && x->calg);
 830         if (x->ealg) {
 831                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 832                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 833         }
 834         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 835         if (x->calg) {
 836                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 837                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 838         }
 839
 840         sa->sadb_sa_flags = 0;
 841         if (x->props.flags & XFRM_STATE_NOECN)
 842                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 843         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 844                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 845         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 846                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 847
 848         /* hard time */
 849         if (hsc & 2) {
 850                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 851                                                              sizeof(struct sadb_lifetime));
 852                 lifetime->sadb_lifetime_len =
 853                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 854                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 855                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 856                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 857                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 858                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 859         }
 860         /* soft time */
 861         if (hsc & 1) {
 862                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 863                                                              sizeof(struct sadb_lifetime));
 864                 lifetime->sadb_lifetime_len =
 865                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 866                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 867                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 868                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 869                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 870                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 871         }
 872         /* current time */
 873         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 874                                                      sizeof(struct sadb_lifetime));
 875         lifetime->sadb_lifetime_len =
 876                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 877         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 878         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 879         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 880         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 881         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 882         /* src address */
 883         addr = (struct sadb_address*) skb_put(skb,
 884                                               sizeof(struct sadb_address)+sockaddr_size);
 885         addr->sadb_address_len =
 886                 (sizeof(struct sadb_address)+sockaddr_size)/
 887                         sizeof(uint64_t);
 888         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 889         /* "if the ports are non-zero, then the sadb_address_proto field,
 890            normally zero, MUST be filled in with the transport
 891            protocol's number." - RFC2367 */
 892         addr->sadb_address_proto = 0;
 893         addr->sadb_address_reserved = 0;
 894
 895         addr->sadb_address_prefixlen =
 896                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 897                                     (struct sockaddr *) (addr + 1),
 898                                     x->props.family);
 899         if (!addr->sadb_address_prefixlen)
 900                 BUG();
 901
 902         /* dst address */
 903         addr = (struct sadb_address*) skb_put(skb,
 904                                               sizeof(struct sadb_address)+sockaddr_size);
 905         addr->sadb_address_len =
 906                 (sizeof(struct sadb_address)+sockaddr_size)/
 907                         sizeof(uint64_t);
 908         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 909         addr->sadb_address_proto = 0;
 910         addr->sadb_address_reserved = 0;
 911
 912         addr->sadb_address_prefixlen =
 913                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 914                                     (struct sockaddr *) (addr + 1),
 915                                     x->props.family);
 916         if (!addr->sadb_address_prefixlen)
 917                 BUG();
 918
 919         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 920                           x->props.family)) {
 921                 addr = (struct sadb_address*) skb_put(skb,
 922                         sizeof(struct sadb_address)+sockaddr_size);
 923                 addr->sadb_address_len =
 924                         (sizeof(struct sadb_address)+sockaddr_size)/
 925                         sizeof(uint64_t);
 926                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 927                 addr->sadb_address_proto =
 928                         pfkey_proto_from_xfrm(x->sel.proto);
 929                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 930                 addr->sadb_address_reserved = 0;
 931
 932                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 933                                     (struct sockaddr *) (addr + 1),
 934                                     x->props.family);
 935         }
 936
 937         /* auth key */
 938         if (add_keys && auth_key_size) {
 939                 key = (struct sadb_key *) skb_put(skb,
 940                                                   sizeof(struct sadb_key)+auth_key_size);
 941                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 942                         sizeof(uint64_t);
 943                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 944                 key->sadb_key_bits = x->aalg->alg_key_len;
 945                 key->sadb_key_reserved = 0;
 946                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 947         }
 948         /* encrypt key */
 949         if (add_keys && encrypt_key_size) {
 950                 key = (struct sadb_key *) skb_put(skb,
 951                                                   sizeof(struct sadb_key)+encrypt_key_size);
 952                 key->sadb_key_len = (sizeof(struct sadb_key) +
 953                                      encrypt_key_size) / sizeof(uint64_t);
 954                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 955                 key->sadb_key_bits = x->ealg->alg_key_len;
 956                 key->sadb_key_reserved = 0;
 957                 memcpy(key + 1, x->ealg->alg_key,
 958                        (x->ealg->alg_key_len+7)/8);
 959         }
 960
 961         /* sa */
 962         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 963         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 964         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 965         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 966                 kfree_skb(skb);
 967                 return ERR_PTR(-EINVAL);
 968         }
 969         sa2->sadb_x_sa2_mode = mode;
 970         sa2->sadb_x_sa2_reserved1 = 0;
 971         sa2->sadb_x_sa2_reserved2 = 0;
 972         sa2->sadb_x_sa2_sequence = 0;
 973         sa2->sadb_x_sa2_reqid = x->props.reqid;
 974
 975         if (natt && natt->encap_type) {
 976                 struct sadb_x_nat_t_type *n_type;
 977                 struct sadb_x_nat_t_port *n_port;
 978
 979                 /* type */
 980                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 981                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 982                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 983                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 984                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 985                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 986                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 987
 988                 /* source port */
 989                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 990                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 991                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 992                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 993                 n_port->sadb_x_nat_t_port_reserved = 0;
 994
 995                 /* dest port */
 996                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 997                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 998                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 999                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1000                 n_port->sadb_x_nat_t_port_reserved = 0;
1001         }
1002
1003         /* security context */
1004         if (xfrm_ctx) {
1005                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1006                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1007                 sec_ctx->sadb_x_sec_len =
1008                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1009                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1010                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1011                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1012                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1013                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1014                        xfrm_ctx->ctx_len);
1015         }
1016
1017         return skb;
1018 }
1019
1020
1021 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1022 {
1023         struct sk_buff *skb;
1024
1025         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1026
1027         return skb;
1028 }
1029
1030 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1031                                                           int hsc)
1032 {
1033         return __pfkey_xfrm_state2msg(x, 0, hsc);
1034 }
1035
1036 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
1037                                                 void **ext_hdrs)
1038 {
1039         struct xfrm_state *x;
1040         struct sadb_lifetime *lifetime;
1041         struct sadb_sa *sa;
1042         struct sadb_key *key;
1043         struct sadb_x_sec_ctx *sec_ctx;
1044         uint16_t proto;
1045         int err;
1046
1047
1048         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1049         if (!sa ||
1050             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1051                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1052                 return ERR_PTR(-EINVAL);
1053         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1054             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1055                 return ERR_PTR(-EINVAL);
1056         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1057             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1058                 return ERR_PTR(-EINVAL);
1059         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1060             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1061                 return ERR_PTR(-EINVAL);
1062
1063         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1064         if (proto == 0)
1065                 return ERR_PTR(-EINVAL);
1066
1067         /* default error is no buffer space */
1068         err = -ENOBUFS;
1069
1070         /* RFC2367:
1071
1072    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1073    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1074    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1075    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1076    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1077    not true.
1078
1079            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1080            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1081          */
1082         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1083             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1084              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1085             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1086                 return ERR_PTR(-EINVAL);
1087         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1088         if (key != NULL &&
1089             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1090             ((key->sadb_key_bits+7) / 8 == 0 ||
1091              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1092                 return ERR_PTR(-EINVAL);
1093         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1094         if (key != NULL &&
1095             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1096             ((key->sadb_key_bits+7) / 8 == 0 ||
1097              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1098                 return ERR_PTR(-EINVAL);
1099
1100         x = xfrm_state_alloc();
1101         if (x == NULL)
1102                 return ERR_PTR(-ENOBUFS);
1103
1104         x->id.proto = proto;
1105         x->id.spi = sa->sadb_sa_spi;
1106         x->props.replay_window = sa->sadb_sa_replay;
1107         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1108                 x->props.flags |= XFRM_STATE_NOECN;
1109         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1110                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1111         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1112                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1113
1114         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1115         if (lifetime != NULL) {
1116                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1117                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1118                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1119                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1120         }
1121         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1122         if (lifetime != NULL) {
1123                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1124                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1125                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1126                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1127         }
1128
1129         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1130         if (sec_ctx != NULL) {
1131                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1132
1133                 if (!uctx)
1134                         goto out;
1135
1136                 err = security_xfrm_state_alloc(x, uctx);
1137                 kfree(uctx);
1138
1139                 if (err)
1140                         goto out;
1141         }
1142
1143         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1144         if (sa->sadb_sa_auth) {
1145                 int keysize = 0;
1146                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1147                 if (!a) {
1148                         err = -ENOSYS;
1149                         goto out;
1150                 }
1151                 if (key)
1152                         keysize = (key->sadb_key_bits + 7) / 8;
1153                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1154                 if (!x->aalg)
1155                         goto out;
1156                 strcpy(x->aalg->alg_name, a->name);
1157                 x->aalg->alg_key_len = 0;
1158                 if (key) {
1159                         x->aalg->alg_key_len = key->sadb_key_bits;
1160                         memcpy(x->aalg->alg_key, key+1, keysize);
1161                 }
1162                 x->props.aalgo = sa->sadb_sa_auth;
1163                 /* x->algo.flags = sa->sadb_sa_flags; */
1164         }
1165         if (sa->sadb_sa_encrypt) {
1166                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1167                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1168                         if (!a) {
1169                                 err = -ENOSYS;
1170                                 goto out;
1171                         }
1172                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1173                         if (!x->calg)
1174                                 goto out;
1175                         strcpy(x->calg->alg_name, a->name);
1176                         x->props.calgo = sa->sadb_sa_encrypt;
1177                 } else {
1178                         int keysize = 0;
1179                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1180                         if (!a) {
1181                                 err = -ENOSYS;
1182                                 goto out;
1183                         }
1184                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1185                         if (key)
1186                                 keysize = (key->sadb_key_bits + 7) / 8;
1187                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1188                         if (!x->ealg)
1189                                 goto out;
1190                         strcpy(x->ealg->alg_name, a->name);
1191                         x->ealg->alg_key_len = 0;
1192                         if (key) {
1193                                 x->ealg->alg_key_len = key->sadb_key_bits;
1194                                 memcpy(x->ealg->alg_key, key+1, keysize);
1195                         }
1196                         x->props.ealgo = sa->sadb_sa_encrypt;
1197                 }
1198         }
1199         /* x->algo.flags = sa->sadb_sa_flags; */
1200
1201         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1202                                                     &x->props.saddr);
1203         if (!x->props.family) {
1204                 err = -EAFNOSUPPORT;
1205                 goto out;
1206         }
1207         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1208                                   &x->id.daddr);
1209
1210         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1211                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1212                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1213                 if (mode < 0) {
1214                         err = -EINVAL;
1215                         goto out;
1216                 }
1217                 x->props.mode = mode;
1218                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1219         }
1220
1221         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1222                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1223
1224                 /* Nobody uses this, but we try. */
1225                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1226                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1227         }
1228
1229         if (!x->sel.family)
1230                 x->sel.family = x->props.family;
1231
1232         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1233                 struct sadb_x_nat_t_type* n_type;
1234                 struct xfrm_encap_tmpl *natt;
1235
1236                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1237                 if (!x->encap)
1238                         goto out;
1239
1240                 natt = x->encap;
1241                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1242                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1243
1244                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1245                         struct sadb_x_nat_t_port* n_port =
1246                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1247                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1248                 }
1249                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1250                         struct sadb_x_nat_t_port* n_port =
1251                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1252                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1253                 }
1254         }
1255
1256         err = xfrm_init_state(x);
1257         if (err)
1258                 goto out;
1259
1260         x->km.seq = hdr->sadb_msg_seq;
1261         return x;
1262
1263 out:
1264         x->km.state = XFRM_STATE_DEAD;
1265         xfrm_state_put(x);
1266         return ERR_PTR(err);
1267 }
1268
1269 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1270 {
1271         return -EOPNOTSUPP;
1272 }
1273
1274 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1275 {
1276         struct sk_buff *resp_skb;
1277         struct sadb_x_sa2 *sa2;
1278         struct sadb_address *saddr, *daddr;
1279         struct sadb_msg *out_hdr;
1280         struct sadb_spirange *range;
1281         struct xfrm_state *x = NULL;
1282         int mode;
1283         int err;
1284         u32 min_spi, max_spi;
1285         u32 reqid;
1286         u8 proto;
1287         unsigned short family;
1288         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1289
1290         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1291                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1292                 return -EINVAL;
1293
1294         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1295         if (proto == 0)
1296                 return -EINVAL;
1297
1298         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1299                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1300                 if (mode < 0)
1301                         return -EINVAL;
1302                 reqid = sa2->sadb_x_sa2_reqid;
1303         } else {
1304                 mode = 0;
1305                 reqid = 0;
1306         }
1307
1308         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1309         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1310
1311         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1312         switch (family) {
1313         case AF_INET:
1314                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1315                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1316                 break;
1317 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1318         case AF_INET6:
1319                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1320                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1321                 break;
1322 #endif
1323         }
1324
1325         if (hdr->sadb_msg_seq) {
1326                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1327                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1328                         xfrm_state_put(x);
1329                         x = NULL;
1330                 }
1331         }
1332
1333         if (!x)
1334                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1335
1336         if (x == NULL)
1337                 return -ENOENT;
1338
1339         min_spi = 0x100;
1340         max_spi = 0x0fffffff;
1341
1342         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1343         if (range) {
1344                 min_spi = range->sadb_spirange_min;
1345                 max_spi = range->sadb_spirange_max;
1346         }
1347
1348         err = xfrm_alloc_spi(x, min_spi, max_spi);
1349         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1350
1351         if (IS_ERR(resp_skb)) {
1352                 xfrm_state_put(x);
1353                 return  PTR_ERR(resp_skb);
1354         }
1355
1356         out_hdr = (struct sadb_msg *) resp_skb->data;
1357         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1358         out_hdr->sadb_msg_type = SADB_GETSPI;
1359         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1360         out_hdr->sadb_msg_errno = 0;
1361         out_hdr->sadb_msg_reserved = 0;
1362         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1363         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1364
1365         xfrm_state_put(x);
1366
1367         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1368
1369         return 0;
1370 }
1371
1372 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1373 {
1374         struct xfrm_state *x;
1375
1376         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1377                 return -EOPNOTSUPP;
1378
1379         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1380                 return 0;
1381
1382         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1383         if (x == NULL)
1384                 return 0;
1385
1386         spin_lock_bh(&x->lock);
1387         if (x->km.state == XFRM_STATE_ACQ) {
1388                 x->km.state = XFRM_STATE_ERROR;
1389                 wake_up(&km_waitq);
1390         }
1391         spin_unlock_bh(&x->lock);
1392         xfrm_state_put(x);
1393         return 0;
1394 }
1395
1396 static inline int event2poltype(int event)
1397 {
1398         switch (event) {
1399         case XFRM_MSG_DELPOLICY:
1400                 return SADB_X_SPDDELETE;
1401         case XFRM_MSG_NEWPOLICY:
1402                 return SADB_X_SPDADD;
1403         case XFRM_MSG_UPDPOLICY:
1404                 return SADB_X_SPDUPDATE;
1405         case XFRM_MSG_POLEXPIRE:
1406         //      return SADB_X_SPDEXPIRE;
1407         default:
1408                 printk("pfkey: Unknown policy event %d\n", event);
1409                 break;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static inline int event2keytype(int event)
1416 {
1417         switch (event) {
1418         case XFRM_MSG_DELSA:
1419                 return SADB_DELETE;
1420         case XFRM_MSG_NEWSA:
1421                 return SADB_ADD;
1422         case XFRM_MSG_UPDSA:
1423                 return SADB_UPDATE;
1424         case XFRM_MSG_EXPIRE:
1425                 return SADB_EXPIRE;
1426         default:
1427                 printk("pfkey: Unknown SA event %d\n", event);
1428                 break;
1429         }
1430
1431         return 0;
1432 }
1433
1434 /* ADD/UPD/DEL */
1435 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1436 {
1437         struct sk_buff *skb;
1438         struct sadb_msg *hdr;
1439
1440         skb = pfkey_xfrm_state2msg(x);
1441
1442         if (IS_ERR(skb))
1443                 return PTR_ERR(skb);
1444
1445         hdr = (struct sadb_msg *) skb->data;
1446         hdr->sadb_msg_version = PF_KEY_V2;
1447         hdr->sadb_msg_type = event2keytype(c->event);
1448         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1449         hdr->sadb_msg_errno = 0;
1450         hdr->sadb_msg_reserved = 0;
1451         hdr->sadb_msg_seq = c->seq;
1452         hdr->sadb_msg_pid = c->pid;
1453
1454         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1455
1456         return 0;
1457 }
1458
1459 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1460 {
1461         struct xfrm_state *x;
1462         int err;
1463         struct km_event c;
1464
1465         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1466         if (IS_ERR(x))
1467                 return PTR_ERR(x);
1468
1469         xfrm_state_hold(x);
1470         if (hdr->sadb_msg_type == SADB_ADD)
1471                 err = xfrm_state_add(x);
1472         else
1473                 err = xfrm_state_update(x);
1474
1475         xfrm_audit_state_add(x, err ? 0 : 1,
1476                              audit_get_loginuid(current),
1477                              audit_get_sessionid(current), 0);
1478
1479         if (err < 0) {
1480                 x->km.state = XFRM_STATE_DEAD;
1481                 __xfrm_state_put(x);
1482                 goto out;
1483         }
1484
1485         if (hdr->sadb_msg_type == SADB_ADD)
1486                 c.event = XFRM_MSG_NEWSA;
1487         else
1488                 c.event = XFRM_MSG_UPDSA;
1489         c.seq = hdr->sadb_msg_seq;
1490         c.pid = hdr->sadb_msg_pid;
1491         km_state_notify(x, &c);
1492 out:
1493         xfrm_state_put(x);
1494         return err;
1495 }
1496
1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1498 {
1499         struct xfrm_state *x;
1500         struct km_event c;
1501         int err;
1502
1503         if (!ext_hdrs[SADB_EXT_SA-1] ||
1504             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1505                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1506                 return -EINVAL;
1507
1508         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1509         if (x == NULL)
1510                 return -ESRCH;
1511
1512         if ((err = security_xfrm_state_delete(x)))
1513                 goto out;
1514
1515         if (xfrm_state_kern(x)) {
1516                 err = -EPERM;
1517                 goto out;
1518         }
1519
1520         err = xfrm_state_delete(x);
1521
1522         if (err < 0)
1523                 goto out;
1524
1525         c.seq = hdr->sadb_msg_seq;
1526         c.pid = hdr->sadb_msg_pid;
1527         c.event = XFRM_MSG_DELSA;
1528         km_state_notify(x, &c);
1529 out:
1530         xfrm_audit_state_delete(x, err ? 0 : 1,
1531                                 audit_get_loginuid(current),
1532                                 audit_get_sessionid(current), 0);
1533         xfrm_state_put(x);
1534
1535         return err;
1536 }
1537
1538 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1539 {
1540         __u8 proto;
1541         struct sk_buff *out_skb;
1542         struct sadb_msg *out_hdr;
1543         struct xfrm_state *x;
1544
1545         if (!ext_hdrs[SADB_EXT_SA-1] ||
1546             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1547                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1548                 return -EINVAL;
1549
1550         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1551         if (x == NULL)
1552                 return -ESRCH;
1553
1554         out_skb = pfkey_xfrm_state2msg(x);
1555         proto = x->id.proto;
1556         xfrm_state_put(x);
1557         if (IS_ERR(out_skb))
1558                 return  PTR_ERR(out_skb);
1559
1560         out_hdr = (struct sadb_msg *) out_skb->data;
1561         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1562         out_hdr->sadb_msg_type = SADB_GET;
1563         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1564         out_hdr->sadb_msg_errno = 0;
1565         out_hdr->sadb_msg_reserved = 0;
1566         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1567         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1568         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1569
1570         return 0;
1571 }
1572
1573 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1574                                               gfp_t allocation)
1575 {
1576         struct sk_buff *skb;
1577         struct sadb_msg *hdr;
1578         int len, auth_len, enc_len, i;
1579
1580         auth_len = xfrm_count_auth_supported();
1581         if (auth_len) {
1582                 auth_len *= sizeof(struct sadb_alg);
1583                 auth_len += sizeof(struct sadb_supported);
1584         }
1585
1586         enc_len = xfrm_count_enc_supported();
1587         if (enc_len) {
1588                 enc_len *= sizeof(struct sadb_alg);
1589                 enc_len += sizeof(struct sadb_supported);
1590         }
1591
1592         len = enc_len + auth_len + sizeof(struct sadb_msg);
1593
1594         skb = alloc_skb(len + 16, allocation);
1595         if (!skb)
1596                 goto out_put_algs;
1597
1598         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1599         pfkey_hdr_dup(hdr, orig);
1600         hdr->sadb_msg_errno = 0;
1601         hdr->sadb_msg_len = len / sizeof(uint64_t);
1602
1603         if (auth_len) {
1604                 struct sadb_supported *sp;
1605                 struct sadb_alg *ap;
1606
1607                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1608                 ap = (struct sadb_alg *) (sp + 1);
1609
1610                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1611                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1612
1613                 for (i = 0; ; i++) {
1614                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1615                         if (!aalg)
1616                                 break;
1617                         if (aalg->available)
1618                                 *ap++ = aalg->desc;
1619                 }
1620         }
1621
1622         if (enc_len) {
1623                 struct sadb_supported *sp;
1624                 struct sadb_alg *ap;
1625
1626                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1627                 ap = (struct sadb_alg *) (sp + 1);
1628
1629                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1630                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1631
1632                 for (i = 0; ; i++) {
1633                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1634                         if (!ealg)
1635                                 break;
1636                         if (ealg->available)
1637                                 *ap++ = ealg->desc;
1638                 }
1639         }
1640
1641 out_put_algs:
1642         return skb;
1643 }
1644
1645 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1646 {
1647         struct pfkey_sock *pfk = pfkey_sk(sk);
1648         struct sk_buff *supp_skb;
1649
1650         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1651                 return -EINVAL;
1652
1653         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1654                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1655                         return -EEXIST;
1656                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1657         }
1658
1659         xfrm_probe_algs();
1660
1661         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1662         if (!supp_skb) {
1663                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1664                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1665
1666                 return -ENOBUFS;
1667         }
1668
1669         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1670
1671         return 0;
1672 }
1673
1674 static int key_notify_sa_flush(struct km_event *c)
1675 {
1676         struct sk_buff *skb;
1677         struct sadb_msg *hdr;
1678
1679         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1680         if (!skb)
1681                 return -ENOBUFS;
1682         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1683         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1684         hdr->sadb_msg_type = SADB_FLUSH;
1685         hdr->sadb_msg_seq = c->seq;
1686         hdr->sadb_msg_pid = c->pid;
1687         hdr->sadb_msg_version = PF_KEY_V2;
1688         hdr->sadb_msg_errno = (uint8_t) 0;
1689         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1690
1691         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1692
1693         return 0;
1694 }
1695
1696 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1697 {
1698         unsigned proto;
1699         struct km_event c;
1700         struct xfrm_audit audit_info;
1701         int err;
1702
1703         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1704         if (proto == 0)
1705                 return -EINVAL;
1706
1707         audit_info.loginuid = audit_get_loginuid(current);
1708         audit_info.sessionid = audit_get_sessionid(current);
1709         audit_info.secid = 0;
1710         err = xfrm_state_flush(proto, &audit_info);
1711         if (err)
1712                 return err;
1713         c.data.proto = proto;
1714         c.seq = hdr->sadb_msg_seq;
1715         c.pid = hdr->sadb_msg_pid;
1716         c.event = XFRM_MSG_FLUSHSA;
1717         km_state_notify(NULL, &c);
1718
1719         return 0;
1720 }
1721
1722 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1723 {
1724         struct pfkey_sock *pfk = ptr;
1725         struct sk_buff *out_skb;
1726         struct sadb_msg *out_hdr;
1727
1728         if (!pfkey_can_dump(&pfk->sk))
1729                 return -ENOBUFS;
1730
1731         out_skb = pfkey_xfrm_state2msg(x);
1732         if (IS_ERR(out_skb))
1733                 return PTR_ERR(out_skb);
1734
1735         out_hdr = (struct sadb_msg *) out_skb->data;
1736         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1737         out_hdr->sadb_msg_type = SADB_DUMP;
1738         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1739         out_hdr->sadb_msg_errno = 0;
1740         out_hdr->sadb_msg_reserved = 0;
1741         out_hdr->sadb_msg_seq = count;
1742         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1743         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
1744         return 0;
1745 }
1746
1747 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1748 {
1749         return xfrm_state_walk(&pfk->dump.u.state, dump_sa, (void *) pfk);
1750 }
1751
1752 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1753 {
1754         xfrm_state_walk_done(&pfk->dump.u.state);
1755 }
1756
1757 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1758 {
1759         u8 proto;
1760         struct pfkey_sock *pfk = pfkey_sk(sk);
1761
1762         if (pfk->dump.dump != NULL)
1763                 return -EBUSY;
1764
1765         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1766         if (proto == 0)
1767                 return -EINVAL;
1768
1769         pfk->dump.msg_version = hdr->sadb_msg_version;
1770         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1771         pfk->dump.dump = pfkey_dump_sa;
1772         pfk->dump.done = pfkey_dump_sa_done;
1773         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1774
1775         return pfkey_do_dump(pfk);
1776 }
1777
1778 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1779 {
1780         struct pfkey_sock *pfk = pfkey_sk(sk);
1781         int satype = hdr->sadb_msg_satype;
1782
1783         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1784                 /* XXX we mangle packet... */
1785                 hdr->sadb_msg_errno = 0;
1786                 if (satype != 0 && satype != 1)
1787                         return -EINVAL;
1788                 pfk->promisc = satype;
1789         }
1790         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1791         return 0;
1792 }
1793
1794 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1795 {
1796         int i;
1797         u32 reqid = *(u32*)ptr;
1798
1799         for (i=0; i<xp->xfrm_nr; i++) {
1800                 if (xp->xfrm_vec[i].reqid == reqid)
1801                         return -EEXIST;
1802         }
1803         return 0;
1804 }
1805
1806 static u32 gen_reqid(void)
1807 {
1808         struct xfrm_policy_walk walk;
1809         u32 start;
1810         int rc;
1811         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1812
1813         start = reqid;
1814         do {
1815                 ++reqid;
1816                 if (reqid == 0)
1817                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1818                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1819                 rc = xfrm_policy_walk(&walk, check_reqid, (void*)&reqid);
1820                 xfrm_policy_walk_done(&walk);
1821                 if (rc != -EEXIST)
1822                         return reqid;
1823         } while (reqid != start);
1824         return 0;
1825 }
1826
1827 static int
1828 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1829 {
1830         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1831         struct sockaddr_in *sin;
1832 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1833         struct sockaddr_in6 *sin6;
1834 #endif
1835         int mode;
1836
1837         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1838                 return -ELOOP;
1839
1840         if (rq->sadb_x_ipsecrequest_mode == 0)
1841                 return -EINVAL;
1842
1843         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1844         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1845                 return -EINVAL;
1846         t->mode = mode;
1847         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1848                 t->optional = 1;
1849         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1850                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1851                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1852                         t->reqid = 0;
1853                 if (!t->reqid && !(t->reqid = gen_reqid()))
1854                         return -ENOBUFS;
1855         }
1856
1857         /* addresses present only in tunnel mode */
1858         if (t->mode == XFRM_MODE_TUNNEL) {
1859                 struct sockaddr *sa;
1860                 sa = (struct sockaddr *)(rq+1);
1861                 switch(sa->sa_family) {
1862                 case AF_INET:
1863                         sin = (struct sockaddr_in*)sa;
1864                         t->saddr.a4 = sin->sin_addr.s_addr;
1865                         sin++;
1866                         if (sin->sin_family != AF_INET)
1867                                 return -EINVAL;
1868                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1869                         break;
1870 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1871                 case AF_INET6:
1872                         sin6 = (struct sockaddr_in6*)sa;
1873                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1874                         sin6++;
1875                         if (sin6->sin6_family != AF_INET6)
1876                                 return -EINVAL;
1877                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1878                         break;
1879 #endif
1880                 default:
1881                         return -EINVAL;
1882                 }
1883                 t->encap_family = sa->sa_family;
1884         } else
1885                 t->encap_family = xp->family;
1886
1887         /* No way to set this via kame pfkey */
1888         t->allalgs = 1;
1889         xp->xfrm_nr++;
1890         return 0;
1891 }
1892
1893 static int
1894 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1895 {
1896         int err;
1897         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1898         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1899
1900         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1901                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1902                         return err;
1903                 len -= rq->sadb_x_ipsecrequest_len;
1904                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1905         }
1906         return 0;
1907 }
1908
1909 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1910 {
1911   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1912
1913         if (xfrm_ctx) {
1914                 int len = sizeof(struct sadb_x_sec_ctx);
1915                 len += xfrm_ctx->ctx_len;
1916                 return PFKEY_ALIGN8(len);
1917         }
1918         return 0;
1919 }
1920
1921 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1922 {
1923         struct xfrm_tmpl *t;
1924         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1925         int socklen = 0;
1926         int i;
1927
1928         for (i=0; i<xp->xfrm_nr; i++) {
1929                 t = xp->xfrm_vec + i;
1930                 socklen += pfkey_sockaddr_len(t->encap_family);
1931         }
1932
1933         return sizeof(struct sadb_msg) +
1934                 (sizeof(struct sadb_lifetime) * 3) +
1935                 (sizeof(struct sadb_address) * 2) +
1936                 (sockaddr_size * 2) +
1937                 sizeof(struct sadb_x_policy) +
1938                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1939                 (socklen * 2) +
1940                 pfkey_xfrm_policy2sec_ctx_size(xp);
1941 }
1942
1943 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1944 {
1945         struct sk_buff *skb;
1946         int size;
1947
1948         size = pfkey_xfrm_policy2msg_size(xp);
1949
1950         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1951         if (skb == NULL)
1952                 return ERR_PTR(-ENOBUFS);
1953
1954         return skb;
1955 }
1956
1957 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1958 {
1959         struct sadb_msg *hdr;
1960         struct sadb_address *addr;
1961         struct sadb_lifetime *lifetime;
1962         struct sadb_x_policy *pol;
1963         struct sadb_x_sec_ctx *sec_ctx;
1964         struct xfrm_sec_ctx *xfrm_ctx;
1965         int i;
1966         int size;
1967         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1968         int socklen = pfkey_sockaddr_len(xp->family);
1969
1970         size = pfkey_xfrm_policy2msg_size(xp);
1971
1972         /* call should fill header later */
1973         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1974         memset(hdr, 0, size);   /* XXX do we need this ? */
1975
1976         /* src address */
1977         addr = (struct sadb_address*) skb_put(skb,
1978                                               sizeof(struct sadb_address)+sockaddr_size);
1979         addr->sadb_address_len =
1980                 (sizeof(struct sadb_address)+sockaddr_size)/
1981                         sizeof(uint64_t);
1982         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1983         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1984         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1985         addr->sadb_address_reserved = 0;
1986         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
1987                                  xp->selector.sport,
1988                                  (struct sockaddr *) (addr + 1),
1989                                  xp->family))
1990                 BUG();
1991
1992         /* dst address */
1993         addr = (struct sadb_address*) skb_put(skb,
1994                                               sizeof(struct sadb_address)+sockaddr_size);
1995         addr->sadb_address_len =
1996                 (sizeof(struct sadb_address)+sockaddr_size)/
1997                         sizeof(uint64_t);
1998         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1999         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2000         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2001         addr->sadb_address_reserved = 0;
2002
2003         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2004                             (struct sockaddr *) (addr + 1),
2005                             xp->family);
2006
2007         /* hard time */
2008         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2009                                                      sizeof(struct sadb_lifetime));
2010         lifetime->sadb_lifetime_len =
2011                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2012         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2013         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2014         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2015         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2016         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2017         /* soft time */
2018         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2019                                                      sizeof(struct sadb_lifetime));
2020         lifetime->sadb_lifetime_len =
2021                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2022         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2023         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2024         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2025         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2026         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2027         /* current time */
2028         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2029                                                      sizeof(struct sadb_lifetime));
2030         lifetime->sadb_lifetime_len =
2031                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2032         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2033         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2034         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2035         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2036         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2037
2038         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2039         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2040         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2041         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2042         if (xp->action == XFRM_POLICY_ALLOW) {
2043                 if (xp->xfrm_nr)
2044                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2045                 else
2046                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2047         }
2048         pol->sadb_x_policy_dir = dir+1;
2049         pol->sadb_x_policy_id = xp->index;
2050         pol->sadb_x_policy_priority = xp->priority;
2051
2052         for (i=0; i<xp->xfrm_nr; i++) {
2053                 struct sadb_x_ipsecrequest *rq;
2054                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2055                 int req_size;
2056                 int mode;
2057
2058                 req_size = sizeof(struct sadb_x_ipsecrequest);
2059                 if (t->mode == XFRM_MODE_TUNNEL) {
2060                         socklen = pfkey_sockaddr_len(t->encap_family);
2061                         req_size += socklen * 2;
2062                 } else {
2063                         size -= 2*socklen;
2064                         socklen = 0;
2065                 }
2066                 rq = (void*)skb_put(skb, req_size);
2067                 pol->sadb_x_policy_len += req_size/8;
2068                 memset(rq, 0, sizeof(*rq));
2069                 rq->sadb_x_ipsecrequest_len = req_size;
2070                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2071                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2072                         return -EINVAL;
2073                 rq->sadb_x_ipsecrequest_mode = mode;
2074                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2075                 if (t->reqid)
2076                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2077                 if (t->optional)
2078                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2079                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2080
2081                 if (t->mode == XFRM_MODE_TUNNEL) {
2082                         u8 *sa = (void *)(rq + 1);
2083                         pfkey_sockaddr_fill(&t->saddr, 0,
2084                                             (struct sockaddr *)sa,
2085                                             t->encap_family);
2086                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2087                                             (struct sockaddr *) (sa + socklen),
2088                                             t->encap_family);
2089                 }
2090         }
2091
2092         /* security context */
2093         if ((xfrm_ctx = xp->security)) {
2094                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2095
2096                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2097                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2098                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2099                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2100                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2101                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2102                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2103                        xfrm_ctx->ctx_len);
2104         }
2105
2106         hdr->sadb_msg_len = size / sizeof(uint64_t);
2107         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2108
2109         return 0;
2110 }
2111
2112 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2113 {
2114         struct sk_buff *out_skb;
2115         struct sadb_msg *out_hdr;
2116         int err;
2117
2118         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2119         if (IS_ERR(out_skb)) {
2120                 err = PTR_ERR(out_skb);
2121                 goto out;
2122         }
2123         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2124         if (err < 0)
2125                 return err;
2126
2127         out_hdr = (struct sadb_msg *) out_skb->data;
2128         out_hdr->sadb_msg_version = PF_KEY_V2;
2129
2130         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2131                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2132         else
2133                 out_hdr->sadb_msg_type = event2poltype(c->event);
2134         out_hdr->sadb_msg_errno = 0;
2135         out_hdr->sadb_msg_seq = c->seq;
2136         out_hdr->sadb_msg_pid = c->pid;
2137         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2138 out:
2139         return 0;
2140
2141 }
2142
2143 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2144 {
2145         int err = 0;
2146         struct sadb_lifetime *lifetime;
2147         struct sadb_address *sa;
2148         struct sadb_x_policy *pol;
2149         struct xfrm_policy *xp;
2150         struct km_event c;
2151         struct sadb_x_sec_ctx *sec_ctx;
2152
2153         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2154                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2155             !ext_hdrs[SADB_X_EXT_POLICY-1])
2156                 return -EINVAL;
2157
2158         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2159         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2160                 return -EINVAL;
2161         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2162                 return -EINVAL;
2163
2164         xp = xfrm_policy_alloc(GFP_KERNEL);
2165         if (xp == NULL)
2166                 return -ENOBUFS;
2167
2168         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2169                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2170         xp->priority = pol->sadb_x_policy_priority;
2171
2172         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2173         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2174         if (!xp->family) {
2175                 err = -EINVAL;
2176                 goto out;
2177         }
2178         xp->selector.family = xp->family;
2179         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2180         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2181         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2182         if (xp->selector.sport)
2183                 xp->selector.sport_mask = htons(0xffff);
2184
2185         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2186         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2187         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2188
2189         /* Amusing, we set this twice.  KAME apps appear to set same value
2190          * in both addresses.
2191          */
2192         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2193
2194         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2195         if (xp->selector.dport)
2196                 xp->selector.dport_mask = htons(0xffff);
2197
2198         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2199         if (sec_ctx != NULL) {
2200                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2201
2202                 if (!uctx) {
2203                         err = -ENOBUFS;
2204                         goto out;
2205                 }
2206
2207                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2208                 kfree(uctx);
2209
2210                 if (err)
2211                         goto out;
2212         }
2213
2214         xp->lft.soft_byte_limit = XFRM_INF;
2215         xp->lft.hard_byte_limit = XFRM_INF;
2216         xp->lft.soft_packet_limit = XFRM_INF;
2217         xp->lft.hard_packet_limit = XFRM_INF;
2218         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2219                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2220                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2221                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2222                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2223         }
2224         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2225                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2226                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2227                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2228                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2229         }
2230         xp->xfrm_nr = 0;
2231         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2232             (err = parse_ipsecrequests(xp, pol)) < 0)
2233                 goto out;
2234
2235         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2236                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2237
2238         xfrm_audit_policy_add(xp, err ? 0 : 1,
2239                               audit_get_loginuid(current),
2240                               audit_get_sessionid(current), 0);
2241
2242         if (err)
2243                 goto out;
2244
2245         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2246                 c.event = XFRM_MSG_UPDPOLICY;
2247         else
2248                 c.event = XFRM_MSG_NEWPOLICY;
2249
2250         c.seq = hdr->sadb_msg_seq;
2251         c.pid = hdr->sadb_msg_pid;
2252
2253         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2254         xfrm_pol_put(xp);
2255         return 0;
2256
2257 out:
2258         xp->dead = 1;
2259         xfrm_policy_destroy(xp);
2260         return err;
2261 }
2262
2263 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2264 {
2265         int err;
2266         struct sadb_address *sa;
2267         struct sadb_x_policy *pol;
2268         struct xfrm_policy *xp;
2269         struct xfrm_selector sel;
2270         struct km_event c;
2271         struct sadb_x_sec_ctx *sec_ctx;
2272         struct xfrm_sec_ctx *pol_ctx = NULL;
2273
2274         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2275                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2276             !ext_hdrs[SADB_X_EXT_POLICY-1])
2277                 return -EINVAL;
2278
2279         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2280         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2281                 return -EINVAL;
2282
2283         memset(&sel, 0, sizeof(sel));
2284
2285         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2286         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2287         sel.prefixlen_s = sa->sadb_address_prefixlen;
2288         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2289         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2290         if (sel.sport)
2291                 sel.sport_mask = htons(0xffff);
2292
2293         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2294         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2295         sel.prefixlen_d = sa->sadb_address_prefixlen;
2296         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2297         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2298         if (sel.dport)
2299                 sel.dport_mask = htons(0xffff);
2300
2301         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2302         if (sec_ctx != NULL) {
2303                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2304
2305                 if (!uctx)
2306                         return -ENOMEM;
2307
2308                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2309                 kfree(uctx);
2310                 if (err)
2311                         return err;
2312         }
2313
2314         xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN,
2315                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2316                                    1, &err);
2317         security_xfrm_policy_free(pol_ctx);
2318         if (xp == NULL)
2319                 return -ENOENT;
2320
2321         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2322                                  audit_get_loginuid(current),
2323                                  audit_get_sessionid(current), 0);
2324
2325         if (err)
2326                 goto out;
2327
2328         c.seq = hdr->sadb_msg_seq;
2329         c.pid = hdr->sadb_msg_pid;
2330         c.event = XFRM_MSG_DELPOLICY;
2331         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2332
2333 out:
2334         xfrm_pol_put(xp);
2335         return err;
2336 }
2337
2338 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2339 {
2340         int err;
2341         struct sk_buff *out_skb;
2342         struct sadb_msg *out_hdr;
2343         err = 0;
2344
2345         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2346         if (IS_ERR(out_skb)) {
2347                 err =  PTR_ERR(out_skb);
2348                 goto out;
2349         }
2350         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2351         if (err < 0)
2352                 goto out;
2353
2354         out_hdr = (struct sadb_msg *) out_skb->data;
2355         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2356         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2357         out_hdr->sadb_msg_satype = 0;
2358         out_hdr->sadb_msg_errno = 0;
2359         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2360         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2361         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2362         err = 0;
2363
2364 out:
2365         return err;
2366 }
2367
2368 #ifdef CONFIG_NET_KEY_MIGRATE
2369 static int pfkey_sockaddr_pair_size(sa_family_t family)
2370 {
2371         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2372 }
2373
2374 static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
2375                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2376                                u16 *family)
2377 {
2378         struct sockaddr *sa = (struct sockaddr *)(rq + 1);
2379         if (rq->sadb_x_ipsecrequest_len <
2380             pfkey_sockaddr_pair_size(sa->sa_family))
2381                 return -EINVAL;
2382
2383         switch (sa->sa_family) {
2384         case AF_INET:
2385                 {
2386                         struct sockaddr_in *sin;
2387                         sin = (struct sockaddr_in *)sa;
2388                         if ((sin+1)->sin_family != AF_INET)
2389                                 return -EINVAL;
2390                         memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4));
2391                         sin++;
2392                         memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4));
2393                         *family = AF_INET;
2394                         break;
2395                 }
2396 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2397         case AF_INET6:
2398                 {
2399                         struct sockaddr_in6 *sin6;
2400                         sin6 = (struct sockaddr_in6 *)sa;
2401                         if ((sin6+1)->sin6_family != AF_INET6)
2402                                 return -EINVAL;
2403                         memcpy(&saddr->a6, &sin6->sin6_addr,
2404                                sizeof(saddr->a6));
2405                         sin6++;
2406                         memcpy(&daddr->a6, &sin6->sin6_addr,
2407                                sizeof(daddr->a6));
2408                         *family = AF_INET6;
2409                         break;
2410                 }
2411 #endif
2412         default:
2413                 return -EINVAL;
2414         }
2415
2416         return 0;
2417 }
2418
2419 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2420                                     struct xfrm_migrate *m)
2421 {
2422         int err;
2423         struct sadb_x_ipsecrequest *rq2;
2424         int mode;
2425
2426         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2427             len < rq1->sadb_x_ipsecrequest_len)
2428                 return -EINVAL;
2429
2430         /* old endoints */
2431         err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr,
2432                                   &m->old_family);
2433         if (err)
2434                 return err;
2435
2436         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2437         len -= rq1->sadb_x_ipsecrequest_len;
2438
2439         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2440             len < rq2->sadb_x_ipsecrequest_len)
2441                 return -EINVAL;
2442
2443         /* new endpoints */
2444         err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr,
2445                                   &m->new_family);
2446         if (err)
2447                 return err;
2448
2449         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2450             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2451             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2452                 return -EINVAL;
2453
2454         m->proto = rq1->sadb_x_ipsecrequest_proto;
2455         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2456                 return -EINVAL;
2457         m->mode = mode;
2458         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2459
2460         return ((int)(rq1->sadb_x_ipsecrequest_len +
2461                       rq2->sadb_x_ipsecrequest_len));
2462 }
2463
2464 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2465                          struct sadb_msg *hdr, void **ext_hdrs)
2466 {
2467         int i, len, ret, err = -EINVAL;
2468         u8 dir;
2469         struct sadb_address *sa;
2470         struct sadb_x_policy *pol;
2471         struct sadb_x_ipsecrequest *rq;
2472         struct xfrm_selector sel;
2473         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2474
2475         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2476             ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2477             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2478                 err = -EINVAL;
2479                 goto out;
2480         }
2481
2482         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2483         if (!pol) {
2484                 err = -EINVAL;
2485                 goto out;
2486         }
2487
2488         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2489                 err = -EINVAL;
2490                 goto out;
2491         }
2492
2493         dir = pol->sadb_x_policy_dir - 1;
2494         memset(&sel, 0, sizeof(sel));
2495
2496         /* set source address info of selector */
2497         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2498         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2499         sel.prefixlen_s = sa->sadb_address_prefixlen;
2500         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2501         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2502         if (sel.sport)
2503                 sel.sport_mask = htons(0xffff);
2504
2505         /* set destination address info of selector */
2506         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2507         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2508         sel.prefixlen_d = sa->sadb_address_prefixlen;
2509         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2510         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2511         if (sel.dport)
2512                 sel.dport_mask = htons(0xffff);
2513
2514         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2515
2516         /* extract ipsecrequests */
2517         i = 0;
2518         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2519
2520         while (len > 0 && i < XFRM_MAX_DEPTH) {
2521                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2522                 if (ret < 0) {
2523                         err = ret;
2524                         goto out;
2525                 } else {
2526                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2527                         len -= ret;
2528                         i++;
2529                 }
2530         }
2531
2532         if (!i || len > 0) {
2533                 err = -EINVAL;
2534                 goto out;
2535         }
2536
2537         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i);
2538
2539  out:
2540         return err;
2541 }
2542 #else
2543 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2544                          struct sadb_msg *hdr, void **ext_hdrs)
2545 {
2546         return -ENOPROTOOPT;
2547 }
2548 #endif
2549
2550
2551 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2552 {
2553         unsigned int dir;
2554         int err = 0, delete;
2555         struct sadb_x_policy *pol;
2556         struct xfrm_policy *xp;
2557         struct km_event c;
2558
2559         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2560                 return -EINVAL;
2561
2562         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2563         if (dir >= XFRM_POLICY_MAX)
2564                 return -EINVAL;
2565
2566         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2567         xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id,
2568                               delete, &err);
2569         if (xp == NULL)
2570                 return -ENOENT;
2571
2572         if (delete) {
2573                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2574                                 audit_get_loginuid(current),
2575                                 audit_get_sessionid(current), 0);
2576
2577                 if (err)
2578                         goto out;
2579                 c.seq = hdr->sadb_msg_seq;
2580                 c.pid = hdr->sadb_msg_pid;
2581                 c.data.byid = 1;
2582                 c.event = XFRM_MSG_DELPOLICY;
2583                 km_policy_notify(xp, dir, &c);
2584         } else {
2585                 err = key_pol_get_resp(sk, xp, hdr, dir);
2586         }
2587
2588 out:
2589         xfrm_pol_put(xp);
2590         return err;
2591 }
2592
2593 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2594 {
2595         struct pfkey_sock *pfk = ptr;
2596         struct sk_buff *out_skb;
2597         struct sadb_msg *out_hdr;
2598         int err;
2599
2600         if (!pfkey_can_dump(&pfk->sk))
2601                 return -ENOBUFS;
2602
2603         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2604         if (IS_ERR(out_skb))
2605                 return PTR_ERR(out_skb);
2606
2607         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2608         if (err < 0)
2609                 return err;
2610
2611         out_hdr = (struct sadb_msg *) out_skb->data;
2612         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2613         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2614         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2615         out_hdr->sadb_msg_errno = 0;
2616         out_hdr->sadb_msg_seq = count;
2617         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2618         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, &pfk->sk);
2619         return 0;
2620 }
2621
2622 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2623 {
2624         return xfrm_policy_walk(&pfk->dump.u.policy, dump_sp, (void *) pfk);
2625 }
2626
2627 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2628 {
2629         xfrm_policy_walk_done(&pfk->dump.u.policy);
2630 }
2631
2632 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2633 {
2634         struct pfkey_sock *pfk = pfkey_sk(sk);
2635
2636         if (pfk->dump.dump != NULL)
2637                 return -EBUSY;
2638
2639         pfk->dump.msg_version = hdr->sadb_msg_version;
2640         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2641         pfk->dump.dump = pfkey_dump_sp;
2642         pfk->dump.done = pfkey_dump_sp_done;
2643         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2644
2645         return pfkey_do_dump(pfk);
2646 }
2647
2648 static int key_notify_policy_flush(struct km_event *c)
2649 {
2650         struct sk_buff *skb_out;
2651         struct sadb_msg *hdr;
2652
2653         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2654         if (!skb_out)
2655                 return -ENOBUFS;
2656         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2657         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2658         hdr->sadb_msg_seq = c->seq;
2659         hdr->sadb_msg_pid = c->pid;
2660         hdr->sadb_msg_version = PF_KEY_V2;
2661         hdr->sadb_msg_errno = (uint8_t) 0;
2662         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2663         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2664         return 0;
2665
2666 }
2667
2668 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2669 {
2670         struct km_event c;
2671         struct xfrm_audit audit_info;
2672         int err;
2673
2674         audit_info.loginuid = audit_get_loginuid(current);
2675         audit_info.sessionid = audit_get_sessionid(current);
2676         audit_info.secid = 0;
2677         err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
2678         if (err)
2679                 return err;
2680         c.data.type = XFRM_POLICY_TYPE_MAIN;
2681         c.event = XFRM_MSG_FLUSHPOLICY;
2682         c.pid = hdr->sadb_msg_pid;
2683         c.seq = hdr->sadb_msg_seq;
2684         km_policy_notify(NULL, 0, &c);
2685
2686         return 0;
2687 }
2688
2689 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2690                              struct sadb_msg *hdr, void **ext_hdrs);
2691 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2692         [SADB_RESERVED]         = pfkey_reserved,
2693         [SADB_GETSPI]           = pfkey_getspi,
2694         [SADB_UPDATE]           = pfkey_add,
2695         [SADB_ADD]              = pfkey_add,
2696         [SADB_DELETE]           = pfkey_delete,
2697         [SADB_GET]              = pfkey_get,
2698         [SADB_ACQUIRE]          = pfkey_acquire,
2699         [SADB_REGISTER]         = pfkey_register,
2700         [SADB_EXPIRE]           = NULL,
2701         [SADB_FLUSH]            = pfkey_flush,
2702         [SADB_DUMP]             = pfkey_dump,
2703         [SADB_X_PROMISC]        = pfkey_promisc,
2704         [SADB_X_PCHANGE]        = NULL,
2705         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2706         [SADB_X_SPDADD]         = pfkey_spdadd,
2707         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2708         [SADB_X_SPDGET]         = pfkey_spdget,
2709         [SADB_X_SPDACQUIRE]     = NULL,
2710         [SADB_X_SPDDUMP]        = pfkey_spddump,
2711         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2712         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2713         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2714         [SADB_X_MIGRATE]        = pfkey_migrate,
2715 };
2716
2717 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2718 {
2719         void *ext_hdrs[SADB_EXT_MAX];
2720         int err;
2721
2722         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2723                         BROADCAST_PROMISC_ONLY, NULL);
2724
2725         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2726         err = parse_exthdrs(skb, hdr, ext_hdrs);
2727         if (!err) {
2728                 err = -EOPNOTSUPP;
2729                 if (pfkey_funcs[hdr->sadb_msg_type])
2730                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2731         }
2732         return err;
2733 }
2734
2735 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2736 {
2737         struct sadb_msg *hdr = NULL;
2738
2739         if (skb->len < sizeof(*hdr)) {
2740                 *errp = -EMSGSIZE;
2741         } else {
2742                 hdr = (struct sadb_msg *) skb->data;
2743                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2744                     hdr->sadb_msg_reserved != 0 ||
2745                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2746                      hdr->sadb_msg_type > SADB_MAX)) {
2747                         hdr = NULL;
2748                         *errp = -EINVAL;
2749                 } else if (hdr->sadb_msg_len != (skb->len /
2750                                                  sizeof(uint64_t)) ||
2751                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2752                                                 sizeof(uint64_t))) {
2753                         hdr = NULL;
2754                         *errp = -EMSGSIZE;
2755                 } else {
2756                         *errp = 0;
2757                 }
2758         }
2759         return hdr;
2760 }
2761
2762 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2763 {
2764         unsigned int id = d->desc.sadb_alg_id;
2765
2766         if (id >= sizeof(t->aalgos) * 8)
2767                 return 0;
2768
2769         return (t->aalgos >> id) & 1;
2770 }
2771
2772 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2773 {
2774         unsigned int id = d->desc.sadb_alg_id;
2775
2776         if (id >= sizeof(t->ealgos) * 8)
2777                 return 0;
2778
2779         return (t->ealgos >> id) & 1;
2780 }
2781
2782 static int count_ah_combs(struct xfrm_tmpl *t)
2783 {
2784         int i, sz = 0;
2785
2786         for (i = 0; ; i++) {
2787                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2788                 if (!aalg)
2789                         break;
2790                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2791                         sz += sizeof(struct sadb_comb);
2792         }
2793         return sz + sizeof(struct sadb_prop);
2794 }
2795
2796 static int count_esp_combs(struct xfrm_tmpl *t)
2797 {
2798         int i, k, sz = 0;
2799
2800         for (i = 0; ; i++) {
2801                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2802                 if (!ealg)
2803                         break;
2804
2805                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2806                         continue;
2807
2808                 for (k = 1; ; k++) {
2809                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2810                         if (!aalg)
2811                                 break;
2812
2813                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2814                                 sz += sizeof(struct sadb_comb);
2815                 }
2816         }
2817         return sz + sizeof(struct sadb_prop);
2818 }
2819
2820 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2821 {
2822         struct sadb_prop *p;
2823         int i;
2824
2825         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2826         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2827         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2828         p->sadb_prop_replay = 32;
2829         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2830
2831         for (i = 0; ; i++) {
2832                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2833                 if (!aalg)
2834                         break;
2835
2836                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2837                         struct sadb_comb *c;
2838                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2839                         memset(c, 0, sizeof(*c));
2840                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2841                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2842                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2843                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2844                         c->sadb_comb_hard_addtime = 24*60*60;
2845                         c->sadb_comb_soft_addtime = 20*60*60;
2846                         c->sadb_comb_hard_usetime = 8*60*60;
2847                         c->sadb_comb_soft_usetime = 7*60*60;
2848                 }
2849         }
2850 }
2851
2852 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2853 {
2854         struct sadb_prop *p;
2855         int i, k;
2856
2857         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2858         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2859         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2860         p->sadb_prop_replay = 32;
2861         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2862
2863         for (i=0; ; i++) {
2864                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2865                 if (!ealg)
2866                         break;
2867
2868                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2869                         continue;
2870
2871                 for (k = 1; ; k++) {
2872                         struct sadb_comb *c;
2873                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2874                         if (!aalg)
2875                                 break;
2876                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2877                                 continue;
2878                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2879                         memset(c, 0, sizeof(*c));
2880                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2881                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2882                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2883                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2884                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2885                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2886                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2887                         c->sadb_comb_hard_addtime = 24*60*60;
2888                         c->sadb_comb_soft_addtime = 20*60*60;
2889                         c->sadb_comb_hard_usetime = 8*60*60;
2890                         c->sadb_comb_soft_usetime = 7*60*60;
2891                 }
2892         }
2893 }
2894
2895 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2896 {
2897         return 0;
2898 }
2899
2900 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2901 {
2902         struct sk_buff *out_skb;
2903         struct sadb_msg *out_hdr;
2904         int hard;
2905         int hsc;
2906
2907         hard = c->data.hard;
2908         if (hard)
2909                 hsc = 2;
2910         else
2911                 hsc = 1;
2912
2913         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2914         if (IS_ERR(out_skb))
2915                 return PTR_ERR(out_skb);
2916
2917         out_hdr = (struct sadb_msg *) out_skb->data;
2918         out_hdr->sadb_msg_version = PF_KEY_V2;
2919         out_hdr->sadb_msg_type = SADB_EXPIRE;
2920         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2921         out_hdr->sadb_msg_errno = 0;
2922         out_hdr->sadb_msg_reserved = 0;
2923         out_hdr->sadb_msg_seq = 0;
2924         out_hdr->sadb_msg_pid = 0;
2925
2926         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2927         return 0;
2928 }
2929
2930 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2931 {
2932         switch (c->event) {
2933         case XFRM_MSG_EXPIRE:
2934                 return key_notify_sa_expire(x, c);
2935         case XFRM_MSG_DELSA:
2936         case XFRM_MSG_NEWSA:
2937         case XFRM_MSG_UPDSA:
2938                 return key_notify_sa(x, c);
2939         case XFRM_MSG_FLUSHSA:
2940                 return key_notify_sa_flush(c);
2941         case XFRM_MSG_NEWAE: /* not yet supported */
2942                 break;
2943         default:
2944                 printk("pfkey: Unknown SA event %d\n", c->event);
2945                 break;
2946         }
2947
2948         return 0;
2949 }
2950
2951 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2952 {
2953         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2954                 return 0;
2955
2956         switch (c->event) {
2957         case XFRM_MSG_POLEXPIRE:
2958                 return key_notify_policy_expire(xp, c);
2959         case XFRM_MSG_DELPOLICY:
2960         case XFRM_MSG_NEWPOLICY:
2961         case XFRM_MSG_UPDPOLICY:
2962                 return key_notify_policy(xp, dir, c);
2963         case XFRM_MSG_FLUSHPOLICY:
2964                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
2965                         break;
2966                 return key_notify_policy_flush(c);
2967         default:
2968                 printk("pfkey: Unknown policy event %d\n", c->event);
2969                 break;
2970         }
2971
2972         return 0;
2973 }
2974
2975 static u32 get_acqseq(void)
2976 {
2977         u32 res;
2978         static u32 acqseq;
2979         static DEFINE_SPINLOCK(acqseq_lock);
2980
2981         spin_lock_bh(&acqseq_lock);
2982         res = (++acqseq ? : ++acqseq);
2983         spin_unlock_bh(&acqseq_lock);
2984         return res;
2985 }
2986
2987 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2988 {
2989         struct sk_buff *skb;
2990         struct sadb_msg *hdr;
2991         struct sadb_address *addr;
2992         struct sadb_x_policy *pol;
2993         int sockaddr_size;
2994         int size;
2995         struct sadb_x_sec_ctx *sec_ctx;
2996         struct xfrm_sec_ctx *xfrm_ctx;
2997         int ctx_size = 0;
2998
2999         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3000         if (!sockaddr_size)
3001                 return -EINVAL;
3002
3003         size = sizeof(struct sadb_msg) +
3004                 (sizeof(struct sadb_address) * 2) +
3005                 (sockaddr_size * 2) +
3006                 sizeof(struct sadb_x_policy);
3007
3008         if (x->id.proto == IPPROTO_AH)
3009                 size += count_ah_combs(t);
3010         else if (x->id.proto == IPPROTO_ESP)
3011                 size += count_esp_combs(t);
3012
3013         if ((xfrm_ctx = x->security)) {
3014                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3015                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3016         }
3017
3018         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3019         if (skb == NULL)
3020                 return -ENOMEM;
3021
3022         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3023         hdr->sadb_msg_version = PF_KEY_V2;
3024         hdr->sadb_msg_type = SADB_ACQUIRE;
3025         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3026         hdr->sadb_msg_len = size / sizeof(uint64_t);
3027         hdr->sadb_msg_errno = 0;
3028         hdr->sadb_msg_reserved = 0;
3029         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3030         hdr->sadb_msg_pid = 0;
3031
3032         /* src address */
3033         addr = (struct sadb_address*) skb_put(skb,
3034                                               sizeof(struct sadb_address)+sockaddr_size);
3035         addr->sadb_address_len =
3036                 (sizeof(struct sadb_address)+sockaddr_size)/
3037                         sizeof(uint64_t);
3038         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3039         addr->sadb_address_proto = 0;
3040         addr->sadb_address_reserved = 0;
3041         addr->sadb_address_prefixlen =
3042                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3043                                     (struct sockaddr *) (addr + 1),
3044                                     x->props.family);
3045         if (!addr->sadb_address_prefixlen)
3046                 BUG();
3047
3048         /* dst address */
3049         addr = (struct sadb_address*) skb_put(skb,
3050                                               sizeof(struct sadb_address)+sockaddr_size);
3051         addr->sadb_address_len =
3052                 (sizeof(struct sadb_address)+sockaddr_size)/
3053                         sizeof(uint64_t);
3054         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3055         addr->sadb_address_proto = 0;
3056         addr->sadb_address_reserved = 0;
3057         addr->sadb_address_prefixlen =
3058                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3059                                     (struct sockaddr *) (addr + 1),
3060                                     x->props.family);
3061         if (!addr->sadb_address_prefixlen)
3062                 BUG();
3063
3064         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3065         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3066         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3067         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3068         pol->sadb_x_policy_dir = dir+1;
3069         pol->sadb_x_policy_id = xp->index;
3070
3071         /* Set sadb_comb's. */
3072         if (x->id.proto == IPPROTO_AH)
3073                 dump_ah_combs(skb, t);
3074         else if (x->id.proto == IPPROTO_ESP)
3075                 dump_esp_combs(skb, t);
3076
3077         /* security context */
3078         if (xfrm_ctx) {
3079                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3080                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3081                 sec_ctx->sadb_x_sec_len =
3082                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3083                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3084                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3085                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3086                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3087                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3088                        xfrm_ctx->ctx_len);
3089         }
3090
3091         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3092 }
3093
3094 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3095                                                 u8 *data, int len, int *dir)
3096 {
3097         struct xfrm_policy *xp;
3098         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3099         struct sadb_x_sec_ctx *sec_ctx;
3100
3101         switch (sk->sk_family) {
3102         case AF_INET:
3103                 if (opt != IP_IPSEC_POLICY) {
3104                         *dir = -EOPNOTSUPP;
3105                         return NULL;
3106                 }
3107                 break;
3108 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3109         case AF_INET6:
3110                 if (opt != IPV6_IPSEC_POLICY) {
3111                         *dir = -EOPNOTSUPP;
3112                         return NULL;
3113                 }
3114                 break;
3115 #endif
3116         default:
3117                 *dir = -EINVAL;
3118                 return NULL;
3119         }
3120
3121         *dir = -EINVAL;
3122
3123         if (len < sizeof(struct sadb_x_policy) ||
3124             pol->sadb_x_policy_len*8 > len ||
3125             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3126             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3127                 return NULL;
3128
3129         xp = xfrm_policy_alloc(GFP_ATOMIC);
3130         if (xp == NULL) {
3131                 *dir = -ENOBUFS;
3132                 return NULL;
3133         }
3134
3135         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3136                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3137
3138         xp->lft.soft_byte_limit = XFRM_INF;
3139         xp->lft.hard_byte_limit = XFRM_INF;
3140         xp->lft.soft_packet_limit = XFRM_INF;
3141         xp->lft.hard_packet_limit = XFRM_INF;
3142         xp->family = sk->sk_family;
3143
3144         xp->xfrm_nr = 0;
3145         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3146             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3147                 goto out;
3148
3149         /* security context too */
3150         if (len >= (pol->sadb_x_policy_len*8 +
3151             sizeof(struct sadb_x_sec_ctx))) {
3152                 char *p = (char *)pol;
3153                 struct xfrm_user_sec_ctx *uctx;
3154
3155                 p += pol->sadb_x_policy_len*8;
3156                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3157                 if (len < pol->sadb_x_policy_len*8 +
3158                     sec_ctx->sadb_x_sec_len) {
3159                         *dir = -EINVAL;
3160                         goto out;
3161                 }
3162                 if ((*dir = verify_sec_ctx_len(p)))
3163                         goto out;
3164                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3165                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3166                 kfree(uctx);
3167
3168                 if (*dir)
3169                         goto out;
3170         }
3171
3172         *dir = pol->sadb_x_policy_dir-1;
3173         return xp;
3174
3175 out:
3176         xfrm_policy_destroy(xp);
3177         return NULL;
3178 }
3179
3180 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3181 {
3182         struct sk_buff *skb;
3183         struct sadb_msg *hdr;
3184         struct sadb_sa *sa;
3185         struct sadb_address *addr;
3186         struct sadb_x_nat_t_port *n_port;
3187         int sockaddr_size;
3188         int size;
3189         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3190         struct xfrm_encap_tmpl *natt = NULL;
3191
3192         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3193         if (!sockaddr_size)
3194                 return -EINVAL;
3195
3196         if (!satype)
3197                 return -EINVAL;
3198
3199         if (!x->encap)
3200                 return -EINVAL;
3201
3202         natt = x->encap;
3203
3204         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3205          *
3206          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3207          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3208          */
3209
3210         size = sizeof(struct sadb_msg) +
3211                 sizeof(struct sadb_sa) +
3212                 (sizeof(struct sadb_address) * 2) +
3213                 (sockaddr_size * 2) +
3214                 (sizeof(struct sadb_x_nat_t_port) * 2);
3215
3216         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3217         if (skb == NULL)
3218                 return -ENOMEM;
3219
3220         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3221         hdr->sadb_msg_version = PF_KEY_V2;
3222         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3223         hdr->sadb_msg_satype = satype;
3224         hdr->sadb_msg_len = size / sizeof(uint64_t);
3225         hdr->sadb_msg_errno = 0;
3226         hdr->sadb_msg_reserved = 0;
3227         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3228         hdr->sadb_msg_pid = 0;
3229
3230         /* SA */
3231         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3232         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3233         sa->sadb_sa_exttype = SADB_EXT_SA;
3234         sa->sadb_sa_spi = x->id.spi;
3235         sa->sadb_sa_replay = 0;
3236         sa->sadb_sa_state = 0;
3237         sa->sadb_sa_auth = 0;
3238         sa->sadb_sa_encrypt = 0;
3239         sa->sadb_sa_flags = 0;
3240
3241         /* ADDRESS_SRC (old addr) */
3242         addr = (struct sadb_address*)
3243                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3244         addr->sadb_address_len =
3245                 (sizeof(struct sadb_address)+sockaddr_size)/
3246                         sizeof(uint64_t);
3247         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3248         addr->sadb_address_proto = 0;
3249         addr->sadb_address_reserved = 0;
3250         addr->sadb_address_prefixlen =
3251                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3252                                     (struct sockaddr *) (addr + 1),
3253                                     x->props.family);
3254         if (!addr->sadb_address_prefixlen)
3255                 BUG();
3256
3257         /* NAT_T_SPORT (old port) */
3258         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3259         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3260         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3261         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3262         n_port->sadb_x_nat_t_port_reserved = 0;
3263
3264         /* ADDRESS_DST (new addr) */
3265         addr = (struct sadb_address*)
3266                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3267         addr->sadb_address_len =
3268                 (sizeof(struct sadb_address)+sockaddr_size)/
3269                         sizeof(uint64_t);
3270         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3271         addr->sadb_address_proto = 0;
3272         addr->sadb_address_reserved = 0;
3273         addr->sadb_address_prefixlen =
3274                 pfkey_sockaddr_fill(ipaddr, 0,
3275                                     (struct sockaddr *) (addr + 1),
3276                                     x->props.family);
3277         if (!addr->sadb_address_prefixlen)
3278                 BUG();
3279
3280         /* NAT_T_DPORT (new port) */
3281         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3282         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3283         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3284         n_port->sadb_x_nat_t_port_port = sport;
3285         n_port->sadb_x_nat_t_port_reserved = 0;
3286
3287         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3288 }
3289
3290 #ifdef CONFIG_NET_KEY_MIGRATE
3291 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3292                             struct xfrm_selector *sel)
3293 {
3294         struct sadb_address *addr;
3295         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3296         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3297         addr->sadb_address_exttype = type;
3298         addr->sadb_address_proto = sel->proto;
3299         addr->sadb_address_reserved = 0;
3300
3301         switch (type) {
3302         case SADB_EXT_ADDRESS_SRC:
3303                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3304                 pfkey_sockaddr_fill(&sel->saddr, 0,
3305                                     (struct sockaddr *)(addr + 1),
3306                                     sel->family);
3307                 break;
3308         case SADB_EXT_ADDRESS_DST:
3309                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3310                 pfkey_sockaddr_fill(&sel->daddr, 0,
3311                                     (struct sockaddr *)(addr + 1),
3312                                     sel->family);
3313                 break;
3314         default:
3315                 return -EINVAL;
3316         }
3317
3318         return 0;
3319 }
3320
3321 static int set_ipsecrequest(struct sk_buff *skb,
3322                             uint8_t proto, uint8_t mode, int level,
3323                             uint32_t reqid, uint8_t family,
3324                             xfrm_address_t *src, xfrm_address_t *dst)
3325 {
3326         struct sadb_x_ipsecrequest *rq;
3327         u8 *sa;
3328         int socklen = pfkey_sockaddr_len(family);
3329         int size_req;
3330
3331         size_req = sizeof(struct sadb_x_ipsecrequest) +
3332                    pfkey_sockaddr_pair_size(family);
3333
3334         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3335         memset(rq, 0, size_req);
3336         rq->sadb_x_ipsecrequest_len = size_req;
3337         rq->sadb_x_ipsecrequest_proto = proto;
3338         rq->sadb_x_ipsecrequest_mode = mode;
3339         rq->sadb_x_ipsecrequest_level = level;
3340         rq->sadb_x_ipsecrequest_reqid = reqid;
3341
3342         sa = (u8 *) (rq + 1);
3343         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3344             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3345                 return -EINVAL;
3346
3347         return 0;
3348 }
3349 #endif
3350
3351 #ifdef CONFIG_NET_KEY_MIGRATE
3352 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3353                               struct xfrm_migrate *m, int num_bundles)
3354 {
3355         int i;
3356         int sasize_sel;
3357         int size = 0;
3358         int size_pol = 0;
3359         struct sk_buff *skb;
3360         struct sadb_msg *hdr;
3361         struct sadb_x_policy *pol;
3362         struct xfrm_migrate *mp;
3363
3364         if (type != XFRM_POLICY_TYPE_MAIN)
3365                 return 0;
3366
3367         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3368                 return -EINVAL;
3369
3370         /* selector */
3371         sasize_sel = pfkey_sockaddr_size(sel->family);
3372         if (!sasize_sel)
3373                 return -EINVAL;
3374         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3375
3376         /* policy info */
3377         size_pol += sizeof(struct sadb_x_policy);
3378
3379         /* ipsecrequests */
3380         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3381                 /* old locator pair */
3382                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3383                             pfkey_sockaddr_pair_size(mp->old_family);
3384                 /* new locator pair */
3385                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3386                             pfkey_sockaddr_pair_size(mp->new_family);
3387         }
3388
3389         size += sizeof(struct sadb_msg) + size_pol;
3390
3391         /* alloc buffer */
3392         skb = alloc_skb(size, GFP_ATOMIC);
3393         if (skb == NULL)
3394                 return -ENOMEM;
3395
3396         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3397         hdr->sadb_msg_version = PF_KEY_V2;
3398         hdr->sadb_msg_type = SADB_X_MIGRATE;
3399         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3400         hdr->sadb_msg_len = size / 8;
3401         hdr->sadb_msg_errno = 0;
3402         hdr->sadb_msg_reserved = 0;
3403         hdr->sadb_msg_seq = 0;
3404         hdr->sadb_msg_pid = 0;
3405
3406         /* selector src */
3407         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3408
3409         /* selector dst */
3410         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3411
3412         /* policy information */
3413         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3414         pol->sadb_x_policy_len = size_pol / 8;
3415         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3416         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3417         pol->sadb_x_policy_dir = dir + 1;
3418         pol->sadb_x_policy_id = 0;
3419         pol->sadb_x_policy_priority = 0;
3420
3421         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3422                 /* old ipsecrequest */
3423                 int mode = pfkey_mode_from_xfrm(mp->mode);
3424                 if (mode < 0)
3425                         goto err;
3426                 if (set_ipsecrequest(skb, mp->proto, mode,
3427                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3428                                      mp->reqid, mp->old_family,
3429                                      &mp->old_saddr, &mp->old_daddr) < 0)
3430                         goto err;
3431
3432                 /* new ipsecrequest */
3433                 if (set_ipsecrequest(skb, mp->proto, mode,
3434                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3435                                      mp->reqid, mp->new_family,
3436                                      &mp->new_saddr, &mp->new_daddr) < 0)
3437                         goto err;
3438         }
3439
3440         /* broadcast migrate message to sockets */
3441         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
3442
3443         return 0;
3444
3445 err:
3446         kfree_skb(skb);
3447         return -EINVAL;
3448 }
3449 #else
3450 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3451                               struct xfrm_migrate *m, int num_bundles)
3452 {
3453         return -ENOPROTOOPT;
3454 }
3455 #endif
3456
3457 static int pfkey_sendmsg(struct kiocb *kiocb,
3458                          struct socket *sock, struct msghdr *msg, size_t len)
3459 {
3460         struct sock *sk = sock->sk;
3461         struct sk_buff *skb = NULL;
3462         struct sadb_msg *hdr = NULL;
3463         int err;
3464
3465         err = -EOPNOTSUPP;
3466         if (msg->msg_flags & MSG_OOB)
3467                 goto out;
3468
3469         err = -EMSGSIZE;
3470         if ((unsigned)len > sk->sk_sndbuf - 32)
3471                 goto out;
3472
3473         err = -ENOBUFS;
3474         skb = alloc_skb(len, GFP_KERNEL);
3475         if (skb == NULL)
3476                 goto out;
3477
3478         err = -EFAULT;
3479         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3480                 goto out;
3481
3482         hdr = pfkey_get_base_msg(skb, &err);
3483         if (!hdr)
3484                 goto out;
3485
3486         mutex_lock(&xfrm_cfg_mutex);
3487         err = pfkey_process(sk, skb, hdr);
3488         mutex_unlock(&xfrm_cfg_mutex);
3489
3490 out:
3491         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3492                 err = 0;
3493         if (skb)
3494                 kfree_skb(skb);
3495
3496         return err ? : len;
3497 }
3498
3499 static int pfkey_recvmsg(struct kiocb *kiocb,
3500                          struct socket *sock, struct msghdr *msg, size_t len,
3501                          int flags)
3502 {
3503         struct sock *sk = sock->sk;
3504         struct pfkey_sock *pfk = pfkey_sk(sk);
3505         struct sk_buff *skb;
3506         int copied, err;
3507
3508         err = -EINVAL;
3509         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3510                 goto out;
3511
3512         msg->msg_namelen = 0;
3513         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3514         if (skb == NULL)
3515                 goto out;
3516
3517         copied = skb->len;
3518         if (copied > len) {
3519                 msg->msg_flags |= MSG_TRUNC;
3520                 copied = len;
3521         }
3522
3523         skb_reset_transport_header(skb);
3524         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3525         if (err)
3526                 goto out_free;
3527
3528         sock_recv_timestamp(msg, sk, skb);
3529
3530         err = (flags & MSG_TRUNC) ? skb->len : copied;
3531
3532         if (pfk->dump.dump != NULL &&
3533             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3534                 pfkey_do_dump(pfk);
3535
3536 out_free:
3537         skb_free_datagram(sk, skb);
3538 out:
3539         return err;
3540 }
3541
3542 static const struct proto_ops pfkey_ops = {
3543         .family         =       PF_KEY,
3544         .owner          =       THIS_MODULE,
3545         /* Operations that make no sense on pfkey sockets. */
3546         .bind           =       sock_no_bind,
3547         .connect        =       sock_no_connect,
3548         .socketpair     =       sock_no_socketpair,
3549         .accept         =       sock_no_accept,
3550         .getname        =       sock_no_getname,
3551         .ioctl          =       sock_no_ioctl,
3552         .listen         =       sock_no_listen,
3553         .shutdown       =       sock_no_shutdown,
3554         .setsockopt     =       sock_no_setsockopt,
3555         .getsockopt     =       sock_no_getsockopt,
3556         .mmap           =       sock_no_mmap,
3557         .sendpage       =       sock_no_sendpage,
3558
3559         /* Now the operations that really occur. */
3560         .release        =       pfkey_release,
3561         .poll           =       datagram_poll,
3562         .sendmsg        =       pfkey_sendmsg,
3563         .recvmsg        =       pfkey_recvmsg,
3564 };
3565
3566 static struct net_proto_family pfkey_family_ops = {
3567         .family =       PF_KEY,
3568         .create =       pfkey_create,
3569         .owner  =       THIS_MODULE,
3570 };
3571
3572 #ifdef CONFIG_PROC_FS
3573 static int pfkey_seq_show(struct seq_file *f, void *v)
3574 {
3575         struct sock *s;
3576
3577         s = (struct sock *)v;
3578         if (v == SEQ_START_TOKEN)
3579                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3580         else
3581                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3582                                s,
3583                                atomic_read(&s->sk_refcnt),
3584                                atomic_read(&s->sk_rmem_alloc),
3585                                atomic_read(&s->sk_wmem_alloc),
3586                                sock_i_uid(s),
3587                                sock_i_ino(s)
3588                                );
3589         return 0;
3590 }
3591
3592 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3593 {
3594         struct sock *s;
3595         struct hlist_node *node;
3596         loff_t pos = *ppos;
3597
3598         read_lock(&pfkey_table_lock);
3599         if (pos == 0)
3600                 return SEQ_START_TOKEN;
3601
3602         sk_for_each(s, node, &pfkey_table)
3603                 if (pos-- == 1)
3604                         return s;
3605
3606         return NULL;
3607 }
3608
3609 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3610 {
3611         ++*ppos;
3612         return (v == SEQ_START_TOKEN) ?
3613                 sk_head(&pfkey_table) :
3614                         sk_next((struct sock *)v);
3615 }
3616
3617 static void pfkey_seq_stop(struct seq_file *f, void *v)
3618 {
3619         read_unlock(&pfkey_table_lock);
3620 }
3621
3622 static struct seq_operations pfkey_seq_ops = {
3623         .start  = pfkey_seq_start,
3624         .next   = pfkey_seq_next,
3625         .stop   = pfkey_seq_stop,
3626         .show   = pfkey_seq_show,
3627 };
3628
3629 static int pfkey_seq_open(struct inode *inode, struct file *file)
3630 {
3631         return seq_open(file, &pfkey_seq_ops);
3632 }
3633
3634 static struct file_operations pfkey_proc_ops = {
3635         .open    = pfkey_seq_open,
3636         .read    = seq_read,
3637         .llseek  = seq_lseek,
3638         .release = seq_release,
3639 };
3640
3641 static int pfkey_init_proc(void)
3642 {
3643         struct proc_dir_entry *e;
3644
3645         e = proc_net_fops_create(&init_net, "pfkey", 0, &pfkey_proc_ops);
3646         if (e == NULL)
3647                 return -ENOMEM;
3648
3649         return 0;
3650 }
3651
3652 static void pfkey_exit_proc(void)
3653 {
3654         proc_net_remove(&init_net, "pfkey");
3655 }
3656 #else
3657 static inline int pfkey_init_proc(void)
3658 {
3659         return 0;
3660 }
3661
3662 static inline void pfkey_exit_proc(void)
3663 {
3664 }
3665 #endif
3666
3667 static struct xfrm_mgr pfkeyv2_mgr =
3668 {
3669         .id             = "pfkeyv2",
3670         .notify         = pfkey_send_notify,
3671         .acquire        = pfkey_send_acquire,
3672         .compile_policy = pfkey_compile_policy,
3673         .new_mapping    = pfkey_send_new_mapping,
3674         .notify_policy  = pfkey_send_policy_notify,
3675         .migrate        = pfkey_send_migrate,
3676 };
3677
3678 static void __exit ipsec_pfkey_exit(void)
3679 {
3680         xfrm_unregister_km(&pfkeyv2_mgr);
3681         pfkey_exit_proc();
3682         sock_unregister(PF_KEY);
3683         proto_unregister(&key_proto);
3684 }
3685
3686 static int __init ipsec_pfkey_init(void)
3687 {
3688         int err = proto_register(&key_proto, 0);
3689
3690         if (err != 0)
3691                 goto out;
3692
3693         err = sock_register(&pfkey_family_ops);
3694         if (err != 0)
3695                 goto out_unregister_key_proto;
3696         err = pfkey_init_proc();
3697         if (err != 0)
3698                 goto out_sock_unregister;
3699         err = xfrm_register_km(&pfkeyv2_mgr);
3700         if (err != 0)
3701                 goto out_remove_proc_entry;
3702 out:
3703         return err;
3704 out_remove_proc_entry:
3705         pfkey_exit_proc();
3706 out_sock_unregister:
3707         sock_unregister(PF_KEY);
3708 out_unregister_key_proto:
3709         proto_unregister(&key_proto);
3710         goto out;
3711 }
3712
3713 module_init(ipsec_pfkey_init);
3714 module_exit(ipsec_pfkey_exit);
3715 MODULE_LICENSE("GPL");
3716 MODULE_ALIAS_NETPROTO(PF_KEY);