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