net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/capability.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <net/net_namespace.h>
  30 #include <net/netns/generic.h>
  31 #include <net/xfrm.h>
  32
  33 #include <net/sock.h>
  34
  35 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  36 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  37
  38 static int pfkey_net_id __read_mostly;
  39 struct netns_pfkey {
  40         /* List of all pfkey sockets. */
  41         struct hlist_head table;
  42         atomic_t socks_nr;
  43 };
  44 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  45 static DEFINE_RWLOCK(pfkey_table_lock);
  46 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
  47
  48 struct pfkey_sock {
  49         /* struct sock must be the first member of struct pfkey_sock */
  50         struct sock     sk;
  51         int             registered;
  52         int             promisc;
  53
  54         struct {
  55                 uint8_t         msg_version;
  56                 uint32_t        msg_pid;
  57                 int             (*dump)(struct pfkey_sock *sk);
  58                 void            (*done)(struct pfkey_sock *sk);
  59                 union {
  60                         struct xfrm_policy_walk policy;
  61                         struct xfrm_state_walk  state;
  62                 } u;
  63                 struct sk_buff  *skb;
  64         } dump;
  65 };
  66
  67 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  68 {
  69         return (struct pfkey_sock *)sk;
  70 }
  71
  72 static int pfkey_can_dump(struct sock *sk)
  73 {
  74         if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf)
  75                 return 1;
  76         return 0;
  77 }
  78
  79 static void pfkey_terminate_dump(struct pfkey_sock *pfk)
  80 {
  81         if (pfk->dump.dump) {
  82                 if (pfk->dump.skb) {
  83                         kfree_skb(pfk->dump.skb);
  84                         pfk->dump.skb = NULL;
  85                 }
  86                 pfk->dump.done(pfk);
  87                 pfk->dump.dump = NULL;
  88                 pfk->dump.done = NULL;
  89         }
  90 }
  91
  92 static void pfkey_sock_destruct(struct sock *sk)
  93 {
  94         struct net *net = sock_net(sk);
  95         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
  96
  97         pfkey_terminate_dump(pfkey_sk(sk));
  98         skb_queue_purge(&sk->sk_receive_queue);
  99
 100         if (!sock_flag(sk, SOCK_DEAD)) {
 101                 printk("Attempt to release alive pfkey socket: %p\n", sk);
 102                 return;
 103         }
 104
 105         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 106         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 107
 108         atomic_dec(&net_pfkey->socks_nr);
 109 }
 110
 111 static void pfkey_table_grab(void)
 112 {
 113         write_lock_bh(&pfkey_table_lock);
 114
 115         if (atomic_read(&pfkey_table_users)) {
 116                 DECLARE_WAITQUEUE(wait, current);
 117
 118                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
 119                 for(;;) {
 120                         set_current_state(TASK_UNINTERRUPTIBLE);
 121                         if (atomic_read(&pfkey_table_users) == 0)
 122                                 break;
 123                         write_unlock_bh(&pfkey_table_lock);
 124                         schedule();
 125                         write_lock_bh(&pfkey_table_lock);
 126                 }
 127
 128                 __set_current_state(TASK_RUNNING);
 129                 remove_wait_queue(&pfkey_table_wait, &wait);
 130         }
 131 }
 132
 133 static __inline__ void pfkey_table_ungrab(void)
 134 {
 135         write_unlock_bh(&pfkey_table_lock);
 136         wake_up(&pfkey_table_wait);
 137 }
 138
 139 static __inline__ void pfkey_lock_table(void)
 140 {
 141         /* read_lock() synchronizes us to pfkey_table_grab */
 142
 143         read_lock(&pfkey_table_lock);
 144         atomic_inc(&pfkey_table_users);
 145         read_unlock(&pfkey_table_lock);
 146 }
 147
 148 static __inline__ void pfkey_unlock_table(void)
 149 {
 150         if (atomic_dec_and_test(&pfkey_table_users))
 151                 wake_up(&pfkey_table_wait);
 152 }
 153
 154
 155 static const struct proto_ops pfkey_ops;
 156
 157 static void pfkey_insert(struct sock *sk)
 158 {
 159         struct net *net = sock_net(sk);
 160         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 161
 162         pfkey_table_grab();
 163         sk_add_node(sk, &net_pfkey->table);
 164         pfkey_table_ungrab();
 165 }
 166
 167 static void pfkey_remove(struct sock *sk)
 168 {
 169         pfkey_table_grab();
 170         sk_del_node_init(sk);
 171         pfkey_table_ungrab();
 172 }
 173
 174 static struct proto key_proto = {
 175         .name     = "KEY",
 176         .owner    = THIS_MODULE,
 177         .obj_size = sizeof(struct pfkey_sock),
 178 };
 179
 180 static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 181                         int kern)
 182 {
 183         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 184         struct sock *sk;
 185         int err;
 186
 187         if (!capable(CAP_NET_ADMIN))
 188                 return -EPERM;
 189         if (sock->type != SOCK_RAW)
 190                 return -ESOCKTNOSUPPORT;
 191         if (protocol != PF_KEY_V2)
 192                 return -EPROTONOSUPPORT;
 193
 194         err = -ENOMEM;
 195         sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto);
 196         if (sk == NULL)
 197                 goto out;
 198
 199         sock->ops = &pfkey_ops;
 200         sock_init_data(sock, sk);
 201
 202         sk->sk_family = PF_KEY;
 203         sk->sk_destruct = pfkey_sock_destruct;
 204
 205         atomic_inc(&net_pfkey->socks_nr);
 206
 207         pfkey_insert(sk);
 208
 209         return 0;
 210 out:
 211         return err;
 212 }
 213
 214 static int pfkey_release(struct socket *sock)
 215 {
 216         struct sock *sk = sock->sk;
 217
 218         if (!sk)
 219                 return 0;
 220
 221         pfkey_remove(sk);
 222
 223         sock_orphan(sk);
 224         sock->sk = NULL;
 225         skb_queue_purge(&sk->sk_write_queue);
 226         sock_put(sk);
 227
 228         return 0;
 229 }
 230
 231 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 232                                gfp_t allocation, struct sock *sk)
 233 {
 234         int err = -ENOBUFS;
 235
 236         sock_hold(sk);
 237         if (*skb2 == NULL) {
 238                 if (atomic_read(&skb->users) != 1) {
 239                         *skb2 = skb_clone(skb, allocation);
 240                 } else {
 241                         *skb2 = skb;
 242                         atomic_inc(&skb->users);
 243                 }
 244         }
 245         if (*skb2 != NULL) {
 246                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 247                         skb_orphan(*skb2);
 248                         skb_set_owner_r(*skb2, sk);
 249                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 250                         sk->sk_data_ready(sk, (*skb2)->len);
 251                         *skb2 = NULL;
 252                         err = 0;
 253                 }
 254         }
 255         sock_put(sk);
 256         return err;
 257 }
 258
 259 /* Send SKB to all pfkey sockets matching selected criteria.  */
 260 #define BROADCAST_ALL           0
 261 #define BROADCAST_ONE           1
 262 #define BROADCAST_REGISTERED    2
 263 #define BROADCAST_PROMISC_ONLY  4
 264 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 265                            int broadcast_flags, struct sock *one_sk,
 266                            struct net *net)
 267 {
 268         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 269         struct sock *sk;
 270         struct hlist_node *node;
 271         struct sk_buff *skb2 = NULL;
 272         int err = -ESRCH;
 273
 274         /* XXX Do we need something like netlink_overrun?  I think
 275          * XXX PF_KEY socket apps will not mind current behavior.
 276          */
 277         if (!skb)
 278                 return -ENOMEM;
 279
 280         pfkey_lock_table();
 281         sk_for_each(sk, node, &net_pfkey->table) {
 282                 struct pfkey_sock *pfk = pfkey_sk(sk);
 283                 int err2;
 284
 285                 /* Yes, it means that if you are meant to receive this
 286                  * pfkey message you receive it twice as promiscuous
 287                  * socket.
 288                  */
 289                 if (pfk->promisc)
 290                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 291
 292                 /* the exact target will be processed later */
 293                 if (sk == one_sk)
 294                         continue;
 295                 if (broadcast_flags != BROADCAST_ALL) {
 296                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 297                                 continue;
 298                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 299                             !pfk->registered)
 300                                 continue;
 301                         if (broadcast_flags & BROADCAST_ONE)
 302                                 continue;
 303                 }
 304
 305                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 306
 307                 /* Error is cleare after succecful sending to at least one
 308                  * registered KM */
 309                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 310                         err = err2;
 311         }
 312         pfkey_unlock_table();
 313
 314         if (one_sk != NULL)
 315                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 316
 317         kfree_skb(skb2);
 318         kfree_skb(skb);
 319         return err;
 320 }
 321
 322 static int pfkey_do_dump(struct pfkey_sock *pfk)
 323 {
 324         struct sadb_msg *hdr;
 325         int rc;
 326
 327         rc = pfk->dump.dump(pfk);
 328         if (rc == -ENOBUFS)
 329                 return 0;
 330
 331         if (pfk->dump.skb) {
 332                 if (!pfkey_can_dump(&pfk->sk))
 333                         return 0;
 334
 335                 hdr = (struct sadb_msg *) pfk->dump.skb->data;
 336                 hdr->sadb_msg_seq = 0;
 337                 hdr->sadb_msg_errno = rc;
 338                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
 339                                 &pfk->sk, sock_net(&pfk->sk));
 340                 pfk->dump.skb = NULL;
 341         }
 342
 343         pfkey_terminate_dump(pfk);
 344         return rc;
 345 }
 346
 347 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 348 {
 349         *new = *orig;
 350 }
 351
 352 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 353 {
 354         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 355         struct sadb_msg *hdr;
 356
 357         if (!skb)
 358                 return -ENOBUFS;
 359
 360         /* Woe be to the platform trying to support PFKEY yet
 361          * having normal errnos outside the 1-255 range, inclusive.
 362          */
 363         err = -err;
 364         if (err == ERESTARTSYS ||
 365             err == ERESTARTNOHAND ||
 366             err == ERESTARTNOINTR)
 367                 err = EINTR;
 368         if (err >= 512)
 369                 err = EINVAL;
 370         BUG_ON(err <= 0 || err >= 256);
 371
 372         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 373         pfkey_hdr_dup(hdr, orig);
 374         hdr->sadb_msg_errno = (uint8_t) err;
 375         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 376                              sizeof(uint64_t));
 377
 378         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk));
 379
 380         return 0;
 381 }
 382
 383 static u8 sadb_ext_min_len[] = {
 384         [SADB_EXT_RESERVED]             = (u8) 0,
 385         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 386         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 387         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 388         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 389         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 390         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 391         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 392         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 393         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 394         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 395         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 396         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 397         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 398         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 399         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 400         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 401         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 402         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 403         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 404         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 405         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 406         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 407         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 408         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 409         [SADB_X_EXT_KMADDRESS]          = (u8) sizeof(struct sadb_x_kmaddress),
 410 };
 411
 412 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 413 static int verify_address_len(void *p)
 414 {
 415         struct sadb_address *sp = p;
 416         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 417         struct sockaddr_in *sin;
 418 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 419         struct sockaddr_in6 *sin6;
 420 #endif
 421         int len;
 422
 423         switch (addr->sa_family) {
 424         case AF_INET:
 425                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t));
 426                 if (sp->sadb_address_len != len ||
 427                     sp->sadb_address_prefixlen > 32)
 428                         return -EINVAL;
 429                 break;
 430 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 431         case AF_INET6:
 432                 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t));
 433                 if (sp->sadb_address_len != len ||
 434                     sp->sadb_address_prefixlen > 128)
 435                         return -EINVAL;
 436                 break;
 437 #endif
 438         default:
 439                 /* It is user using kernel to keep track of security
 440                  * associations for another protocol, such as
 441                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 442                  * lengths.
 443                  *
 444                  * XXX Actually, association/policy database is not yet
 445                  * XXX able to cope with arbitrary sockaddr families.
 446                  * XXX When it can, remove this -EINVAL.  -DaveM
 447                  */
 448                 return -EINVAL;
 449                 break;
 450         }
 451
 452         return 0;
 453 }
 454
 455 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 456 {
 457         return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) +
 458                             sec_ctx->sadb_x_ctx_len,
 459                             sizeof(uint64_t));
 460 }
 461
 462 static inline int verify_sec_ctx_len(void *p)
 463 {
 464         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 465         int len = sec_ctx->sadb_x_ctx_len;
 466
 467         if (len > PAGE_SIZE)
 468                 return -EINVAL;
 469
 470         len = pfkey_sec_ctx_len(sec_ctx);
 471
 472         if (sec_ctx->sadb_x_sec_len != len)
 473                 return -EINVAL;
 474
 475         return 0;
 476 }
 477
 478 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 479 {
 480         struct xfrm_user_sec_ctx *uctx = NULL;
 481         int ctx_size = sec_ctx->sadb_x_ctx_len;
 482
 483         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 484
 485         if (!uctx)
 486                 return NULL;
 487
 488         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 489         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 490         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 491         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 492         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 493         memcpy(uctx + 1, sec_ctx + 1,
 494                uctx->ctx_len);
 495
 496         return uctx;
 497 }
 498
 499 static int present_and_same_family(struct sadb_address *src,
 500                                    struct sadb_address *dst)
 501 {
 502         struct sockaddr *s_addr, *d_addr;
 503
 504         if (!src || !dst)
 505                 return 0;
 506
 507         s_addr = (struct sockaddr *)(src + 1);
 508         d_addr = (struct sockaddr *)(dst + 1);
 509         if (s_addr->sa_family != d_addr->sa_family)
 510                 return 0;
 511         if (s_addr->sa_family != AF_INET
 512 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 513             && s_addr->sa_family != AF_INET6
 514 #endif
 515                 )
 516                 return 0;
 517
 518         return 1;
 519 }
 520
 521 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 522 {
 523         char *p = (char *) hdr;
 524         int len = skb->len;
 525
 526         len -= sizeof(*hdr);
 527         p += sizeof(*hdr);
 528         while (len > 0) {
 529                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 530                 uint16_t ext_type;
 531                 int ext_len;
 532
 533                 ext_len  = ehdr->sadb_ext_len;
 534                 ext_len *= sizeof(uint64_t);
 535                 ext_type = ehdr->sadb_ext_type;
 536                 if (ext_len < sizeof(uint64_t) ||
 537                     ext_len > len ||
 538                     ext_type == SADB_EXT_RESERVED)
 539                         return -EINVAL;
 540
 541                 if (ext_type <= SADB_EXT_MAX) {
 542                         int min = (int) sadb_ext_min_len[ext_type];
 543                         if (ext_len < min)
 544                                 return -EINVAL;
 545                         if (ext_hdrs[ext_type-1] != NULL)
 546                                 return -EINVAL;
 547                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 548                             ext_type == SADB_EXT_ADDRESS_DST ||
 549                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 550                             ext_type == SADB_X_EXT_NAT_T_OA) {
 551                                 if (verify_address_len(p))
 552                                         return -EINVAL;
 553                         }
 554                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 555                                 if (verify_sec_ctx_len(p))
 556                                         return -EINVAL;
 557                         }
 558                         ext_hdrs[ext_type-1] = p;
 559                 }
 560                 p   += ext_len;
 561                 len -= ext_len;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static uint16_t
 568 pfkey_satype2proto(uint8_t satype)
 569 {
 570         switch (satype) {
 571         case SADB_SATYPE_UNSPEC:
 572                 return IPSEC_PROTO_ANY;
 573         case SADB_SATYPE_AH:
 574                 return IPPROTO_AH;
 575         case SADB_SATYPE_ESP:
 576                 return IPPROTO_ESP;
 577         case SADB_X_SATYPE_IPCOMP:
 578                 return IPPROTO_COMP;
 579                 break;
 580         default:
 581                 return 0;
 582         }
 583         /* NOTREACHED */
 584 }
 585
 586 static uint8_t
 587 pfkey_proto2satype(uint16_t proto)
 588 {
 589         switch (proto) {
 590         case IPPROTO_AH:
 591                 return SADB_SATYPE_AH;
 592         case IPPROTO_ESP:
 593                 return SADB_SATYPE_ESP;
 594         case IPPROTO_COMP:
 595                 return SADB_X_SATYPE_IPCOMP;
 596                 break;
 597         default:
 598                 return 0;
 599         }
 600         /* NOTREACHED */
 601 }
 602
 603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 604  * say specifically 'just raw sockets' as we encode them as 255.
 605  */
 606
 607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 608 {
 609         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 610 }
 611
 612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 613 {
 614         return (proto ? proto : IPSEC_PROTO_ANY);
 615 }
 616
 617 static inline int pfkey_sockaddr_len(sa_family_t family)
 618 {
 619         switch (family) {
 620         case AF_INET:
 621                 return sizeof(struct sockaddr_in);
 622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 623         case AF_INET6:
 624                 return sizeof(struct sockaddr_in6);
 625 #endif
 626         }
 627         return 0;
 628 }
 629
 630 static
 631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 632 {
 633         switch (sa->sa_family) {
 634         case AF_INET:
 635                 xaddr->a4 =
 636                         ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 637                 return AF_INET;
 638 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 639         case AF_INET6:
 640                 memcpy(xaddr->a6,
 641                        &((struct sockaddr_in6 *)sa)->sin6_addr,
 642                        sizeof(struct in6_addr));
 643                 return AF_INET6;
 644 #endif
 645         }
 646         return 0;
 647 }
 648
 649 static
 650 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
 651 {
 652         return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
 653                                       xaddr);
 654 }
 655
 656 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs)
 657 {
 658         struct sadb_sa *sa;
 659         struct sadb_address *addr;
 660         uint16_t proto;
 661         unsigned short family;
 662         xfrm_address_t *xaddr;
 663
 664         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 665         if (sa == NULL)
 666                 return NULL;
 667
 668         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 669         if (proto == 0)
 670                 return NULL;
 671
 672         /* sadb_address_len should be checked by caller */
 673         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 674         if (addr == NULL)
 675                 return NULL;
 676
 677         family = ((struct sockaddr *)(addr + 1))->sa_family;
 678         switch (family) {
 679         case AF_INET:
 680                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 681                 break;
 682 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 683         case AF_INET6:
 684                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 685                 break;
 686 #endif
 687         default:
 688                 xaddr = NULL;
 689         }
 690
 691         if (!xaddr)
 692                 return NULL;
 693
 694         return xfrm_state_lookup(net, xaddr, sa->sadb_sa_spi, proto, family);
 695 }
 696
 697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 698
 699 static int
 700 pfkey_sockaddr_size(sa_family_t family)
 701 {
 702         return PFKEY_ALIGN8(pfkey_sockaddr_len(family));
 703 }
 704
 705 static inline int pfkey_mode_from_xfrm(int mode)
 706 {
 707         switch(mode) {
 708         case XFRM_MODE_TRANSPORT:
 709                 return IPSEC_MODE_TRANSPORT;
 710         case XFRM_MODE_TUNNEL:
 711                 return IPSEC_MODE_TUNNEL;
 712         case XFRM_MODE_BEET:
 713                 return IPSEC_MODE_BEET;
 714         default:
 715                 return -1;
 716         }
 717 }
 718
 719 static inline int pfkey_mode_to_xfrm(int mode)
 720 {
 721         switch(mode) {
 722         case IPSEC_MODE_ANY:    /*XXX*/
 723         case IPSEC_MODE_TRANSPORT:
 724                 return XFRM_MODE_TRANSPORT;
 725         case IPSEC_MODE_TUNNEL:
 726                 return XFRM_MODE_TUNNEL;
 727         case IPSEC_MODE_BEET:
 728                 return XFRM_MODE_BEET;
 729         default:
 730                 return -1;
 731         }
 732 }
 733
 734 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port,
 735                                        struct sockaddr *sa,
 736                                        unsigned short family)
 737 {
 738         switch (family) {
 739         case AF_INET:
 740             {
 741                 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
 742                 sin->sin_family = AF_INET;
 743                 sin->sin_port = port;
 744                 sin->sin_addr.s_addr = xaddr->a4;
 745                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 746                 return 32;
 747             }
 748 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 749         case AF_INET6:
 750             {
 751                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
 752                 sin6->sin6_family = AF_INET6;
 753                 sin6->sin6_port = port;
 754                 sin6->sin6_flowinfo = 0;
 755                 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6);
 756                 sin6->sin6_scope_id = 0;
 757                 return 128;
 758             }
 759 #endif
 760         }
 761         return 0;
 762 }
 763
 764 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
 765                                               int add_keys, int hsc)
 766 {
 767         struct sk_buff *skb;
 768         struct sadb_msg *hdr;
 769         struct sadb_sa *sa;
 770         struct sadb_lifetime *lifetime;
 771         struct sadb_address *addr;
 772         struct sadb_key *key;
 773         struct sadb_x_sa2 *sa2;
 774         struct sadb_x_sec_ctx *sec_ctx;
 775         struct xfrm_sec_ctx *xfrm_ctx;
 776         int ctx_size = 0;
 777         int size;
 778         int auth_key_size = 0;
 779         int encrypt_key_size = 0;
 780         int sockaddr_size;
 781         struct xfrm_encap_tmpl *natt = NULL;
 782         int mode;
 783
 784         /* address family check */
 785         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 786         if (!sockaddr_size)
 787                 return ERR_PTR(-EINVAL);
 788
 789         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 790            key(AE), (identity(SD),) (sensitivity)> */
 791         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 792                 sizeof(struct sadb_lifetime) +
 793                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 794                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 795                         sizeof(struct sadb_address)*2 +
 796                                 sockaddr_size*2 +
 797                                         sizeof(struct sadb_x_sa2);
 798
 799         if ((xfrm_ctx = x->security)) {
 800                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 801                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 802         }
 803
 804         /* identity & sensitivity */
 805         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family))
 806                 size += sizeof(struct sadb_address) + sockaddr_size;
 807
 808         if (add_keys) {
 809                 if (x->aalg && x->aalg->alg_key_len) {
 810                         auth_key_size =
 811                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 812                         size += sizeof(struct sadb_key) + auth_key_size;
 813                 }
 814                 if (x->ealg && x->ealg->alg_key_len) {
 815                         encrypt_key_size =
 816                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 817                         size += sizeof(struct sadb_key) + encrypt_key_size;
 818                 }
 819         }
 820         if (x->encap)
 821                 natt = x->encap;
 822
 823         if (natt && natt->encap_type) {
 824                 size += sizeof(struct sadb_x_nat_t_type);
 825                 size += sizeof(struct sadb_x_nat_t_port);
 826                 size += sizeof(struct sadb_x_nat_t_port);
 827         }
 828
 829         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 830         if (skb == NULL)
 831                 return ERR_PTR(-ENOBUFS);
 832
 833         /* call should fill header later */
 834         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 835         memset(hdr, 0, size);   /* XXX do we need this ? */
 836         hdr->sadb_msg_len = size / sizeof(uint64_t);
 837
 838         /* sa */
 839         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 840         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 841         sa->sadb_sa_exttype = SADB_EXT_SA;
 842         sa->sadb_sa_spi = x->id.spi;
 843         sa->sadb_sa_replay = x->props.replay_window;
 844         switch (x->km.state) {
 845         case XFRM_STATE_VALID:
 846                 sa->sadb_sa_state = x->km.dying ?
 847                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 848                 break;
 849         case XFRM_STATE_ACQ:
 850                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 851                 break;
 852         default:
 853                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 854                 break;
 855         }
 856         sa->sadb_sa_auth = 0;
 857         if (x->aalg) {
 858                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 859                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 860         }
 861         sa->sadb_sa_encrypt = 0;
 862         BUG_ON(x->ealg && x->calg);
 863         if (x->ealg) {
 864                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 865                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 866         }
 867         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 868         if (x->calg) {
 869                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 870                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 871         }
 872
 873         sa->sadb_sa_flags = 0;
 874         if (x->props.flags & XFRM_STATE_NOECN)
 875                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 876         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 877                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 878         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 879                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 880
 881         /* hard time */
 882         if (hsc & 2) {
 883                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 884                                                              sizeof(struct sadb_lifetime));
 885                 lifetime->sadb_lifetime_len =
 886                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 887                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 888                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 889                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 890                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 891                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 892         }
 893         /* soft time */
 894         if (hsc & 1) {
 895                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 896                                                              sizeof(struct sadb_lifetime));
 897                 lifetime->sadb_lifetime_len =
 898                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 899                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 900                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 901                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 902                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 903                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 904         }
 905         /* current time */
 906         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 907                                                      sizeof(struct sadb_lifetime));
 908         lifetime->sadb_lifetime_len =
 909                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 910         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 911         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 912         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 913         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 914         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 915         /* src address */
 916         addr = (struct sadb_address*) skb_put(skb,
 917                                               sizeof(struct sadb_address)+sockaddr_size);
 918         addr->sadb_address_len =
 919                 (sizeof(struct sadb_address)+sockaddr_size)/
 920                         sizeof(uint64_t);
 921         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 922         /* "if the ports are non-zero, then the sadb_address_proto field,
 923            normally zero, MUST be filled in with the transport
 924            protocol's number." - RFC2367 */
 925         addr->sadb_address_proto = 0;
 926         addr->sadb_address_reserved = 0;
 927
 928         addr->sadb_address_prefixlen =
 929                 pfkey_sockaddr_fill(&x->props.saddr, 0,
 930                                     (struct sockaddr *) (addr + 1),
 931                                     x->props.family);
 932         if (!addr->sadb_address_prefixlen)
 933                 BUG();
 934
 935         /* dst address */
 936         addr = (struct sadb_address*) skb_put(skb,
 937                                               sizeof(struct sadb_address)+sockaddr_size);
 938         addr->sadb_address_len =
 939                 (sizeof(struct sadb_address)+sockaddr_size)/
 940                         sizeof(uint64_t);
 941         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 942         addr->sadb_address_proto = 0;
 943         addr->sadb_address_reserved = 0;
 944
 945         addr->sadb_address_prefixlen =
 946                 pfkey_sockaddr_fill(&x->id.daddr, 0,
 947                                     (struct sockaddr *) (addr + 1),
 948                                     x->props.family);
 949         if (!addr->sadb_address_prefixlen)
 950                 BUG();
 951
 952         if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr,
 953                           x->props.family)) {
 954                 addr = (struct sadb_address*) skb_put(skb,
 955                         sizeof(struct sadb_address)+sockaddr_size);
 956                 addr->sadb_address_len =
 957                         (sizeof(struct sadb_address)+sockaddr_size)/
 958                         sizeof(uint64_t);
 959                 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 960                 addr->sadb_address_proto =
 961                         pfkey_proto_from_xfrm(x->sel.proto);
 962                 addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 963                 addr->sadb_address_reserved = 0;
 964
 965                 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport,
 966                                     (struct sockaddr *) (addr + 1),
 967                                     x->props.family);
 968         }
 969
 970         /* auth key */
 971         if (add_keys && auth_key_size) {
 972                 key = (struct sadb_key *) skb_put(skb,
 973                                                   sizeof(struct sadb_key)+auth_key_size);
 974                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 975                         sizeof(uint64_t);
 976                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 977                 key->sadb_key_bits = x->aalg->alg_key_len;
 978                 key->sadb_key_reserved = 0;
 979                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 980         }
 981         /* encrypt key */
 982         if (add_keys && encrypt_key_size) {
 983                 key = (struct sadb_key *) skb_put(skb,
 984                                                   sizeof(struct sadb_key)+encrypt_key_size);
 985                 key->sadb_key_len = (sizeof(struct sadb_key) +
 986                                      encrypt_key_size) / sizeof(uint64_t);
 987                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 988                 key->sadb_key_bits = x->ealg->alg_key_len;
 989                 key->sadb_key_reserved = 0;
 990                 memcpy(key + 1, x->ealg->alg_key,
 991                        (x->ealg->alg_key_len+7)/8);
 992         }
 993
 994         /* sa */
 995         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 996         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 997         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 998         if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) {
 999                 kfree_skb(skb);
1000                 return ERR_PTR(-EINVAL);
1001         }
1002         sa2->sadb_x_sa2_mode = mode;
1003         sa2->sadb_x_sa2_reserved1 = 0;
1004         sa2->sadb_x_sa2_reserved2 = 0;
1005         sa2->sadb_x_sa2_sequence = 0;
1006         sa2->sadb_x_sa2_reqid = x->props.reqid;
1007
1008         if (natt && natt->encap_type) {
1009                 struct sadb_x_nat_t_type *n_type;
1010                 struct sadb_x_nat_t_port *n_port;
1011
1012                 /* type */
1013                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
1014                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
1015                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
1016                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
1017                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
1018                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
1019                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
1020
1021                 /* source port */
1022                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1023                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1024                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
1025                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
1026                 n_port->sadb_x_nat_t_port_reserved = 0;
1027
1028                 /* dest port */
1029                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
1030                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
1031                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
1032                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
1033                 n_port->sadb_x_nat_t_port_reserved = 0;
1034         }
1035
1036         /* security context */
1037         if (xfrm_ctx) {
1038                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
1039                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
1040                 sec_ctx->sadb_x_sec_len =
1041                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
1042                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
1043                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
1044                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
1045                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
1046                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
1047                        xfrm_ctx->ctx_len);
1048         }
1049
1050         return skb;
1051 }
1052
1053
1054 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
1055 {
1056         struct sk_buff *skb;
1057
1058         skb = __pfkey_xfrm_state2msg(x, 1, 3);
1059
1060         return skb;
1061 }
1062
1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
1064                                                           int hsc)
1065 {
1066         return __pfkey_xfrm_state2msg(x, 0, hsc);
1067 }
1068
1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net,
1070                                                 struct sadb_msg *hdr,
1071                                                 void **ext_hdrs)
1072 {
1073         struct xfrm_state *x;
1074         struct sadb_lifetime *lifetime;
1075         struct sadb_sa *sa;
1076         struct sadb_key *key;
1077         struct sadb_x_sec_ctx *sec_ctx;
1078         uint16_t proto;
1079         int err;
1080
1081
1082         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
1083         if (!sa ||
1084             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1085                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1086                 return ERR_PTR(-EINVAL);
1087         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1088             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1089                 return ERR_PTR(-EINVAL);
1090         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1091             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1092                 return ERR_PTR(-EINVAL);
1093         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1094             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1095                 return ERR_PTR(-EINVAL);
1096
1097         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1098         if (proto == 0)
1099                 return ERR_PTR(-EINVAL);
1100
1101         /* default error is no buffer space */
1102         err = -ENOBUFS;
1103
1104         /* RFC2367:
1105
1106    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1107    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1108    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1109    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1110    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1111    not true.
1112
1113            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1114            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1115          */
1116         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1117             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1118              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1119             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1120                 return ERR_PTR(-EINVAL);
1121         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1122         if (key != NULL &&
1123             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1124             ((key->sadb_key_bits+7) / 8 == 0 ||
1125              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1126                 return ERR_PTR(-EINVAL);
1127         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1128         if (key != NULL &&
1129             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1130             ((key->sadb_key_bits+7) / 8 == 0 ||
1131              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1132                 return ERR_PTR(-EINVAL);
1133
1134         x = xfrm_state_alloc(net);
1135         if (x == NULL)
1136                 return ERR_PTR(-ENOBUFS);
1137
1138         x->id.proto = proto;
1139         x->id.spi = sa->sadb_sa_spi;
1140         x->props.replay_window = sa->sadb_sa_replay;
1141         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1142                 x->props.flags |= XFRM_STATE_NOECN;
1143         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1144                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1145         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1146                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1147
1148         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1149         if (lifetime != NULL) {
1150                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1151                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1152                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1153                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1154         }
1155         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1156         if (lifetime != NULL) {
1157                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1158                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1159                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1160                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1161         }
1162
1163         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1164         if (sec_ctx != NULL) {
1165                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1166
1167                 if (!uctx)
1168                         goto out;
1169
1170                 err = security_xfrm_state_alloc(x, uctx);
1171                 kfree(uctx);
1172
1173                 if (err)
1174                         goto out;
1175         }
1176
1177         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1178         if (sa->sadb_sa_auth) {
1179                 int keysize = 0;
1180                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1181                 if (!a) {
1182                         err = -ENOSYS;
1183                         goto out;
1184                 }
1185                 if (key)
1186                         keysize = (key->sadb_key_bits + 7) / 8;
1187                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1188                 if (!x->aalg)
1189                         goto out;
1190                 strcpy(x->aalg->alg_name, a->name);
1191                 x->aalg->alg_key_len = 0;
1192                 if (key) {
1193                         x->aalg->alg_key_len = key->sadb_key_bits;
1194                         memcpy(x->aalg->alg_key, key+1, keysize);
1195                 }
1196                 x->props.aalgo = sa->sadb_sa_auth;
1197                 /* x->algo.flags = sa->sadb_sa_flags; */
1198         }
1199         if (sa->sadb_sa_encrypt) {
1200                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1201                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1202                         if (!a) {
1203                                 err = -ENOSYS;
1204                                 goto out;
1205                         }
1206                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1207                         if (!x->calg)
1208                                 goto out;
1209                         strcpy(x->calg->alg_name, a->name);
1210                         x->props.calgo = sa->sadb_sa_encrypt;
1211                 } else {
1212                         int keysize = 0;
1213                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1214                         if (!a) {
1215                                 err = -ENOSYS;
1216                                 goto out;
1217                         }
1218                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1219                         if (key)
1220                                 keysize = (key->sadb_key_bits + 7) / 8;
1221                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1222                         if (!x->ealg)
1223                                 goto out;
1224                         strcpy(x->ealg->alg_name, a->name);
1225                         x->ealg->alg_key_len = 0;
1226                         if (key) {
1227                                 x->ealg->alg_key_len = key->sadb_key_bits;
1228                                 memcpy(x->ealg->alg_key, key+1, keysize);
1229                         }
1230                         x->props.ealgo = sa->sadb_sa_encrypt;
1231                 }
1232         }
1233         /* x->algo.flags = sa->sadb_sa_flags; */
1234
1235         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1236                                                     &x->props.saddr);
1237         if (!x->props.family) {
1238                 err = -EAFNOSUPPORT;
1239                 goto out;
1240         }
1241         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1242                                   &x->id.daddr);
1243
1244         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1245                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1246                 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1247                 if (mode < 0) {
1248                         err = -EINVAL;
1249                         goto out;
1250                 }
1251                 x->props.mode = mode;
1252                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1253         }
1254
1255         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1256                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1257
1258                 /* Nobody uses this, but we try. */
1259                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1260                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1261         }
1262
1263         if (!x->sel.family)
1264                 x->sel.family = x->props.family;
1265
1266         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1267                 struct sadb_x_nat_t_type* n_type;
1268                 struct xfrm_encap_tmpl *natt;
1269
1270                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1271                 if (!x->encap)
1272                         goto out;
1273
1274                 natt = x->encap;
1275                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1276                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1277
1278                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1279                         struct sadb_x_nat_t_port* n_port =
1280                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1281                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1282                 }
1283                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1284                         struct sadb_x_nat_t_port* n_port =
1285                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1286                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1287                 }
1288                 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa));
1289         }
1290
1291         err = xfrm_init_state(x);
1292         if (err)
1293                 goto out;
1294
1295         x->km.seq = hdr->sadb_msg_seq;
1296         return x;
1297
1298 out:
1299         x->km.state = XFRM_STATE_DEAD;
1300         xfrm_state_put(x);
1301         return ERR_PTR(err);
1302 }
1303
1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1305 {
1306         return -EOPNOTSUPP;
1307 }
1308
1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1310 {
1311         struct net *net = sock_net(sk);
1312         struct sk_buff *resp_skb;
1313         struct sadb_x_sa2 *sa2;
1314         struct sadb_address *saddr, *daddr;
1315         struct sadb_msg *out_hdr;
1316         struct sadb_spirange *range;
1317         struct xfrm_state *x = NULL;
1318         int mode;
1319         int err;
1320         u32 min_spi, max_spi;
1321         u32 reqid;
1322         u8 proto;
1323         unsigned short family;
1324         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1325
1326         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1327                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1328                 return -EINVAL;
1329
1330         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1331         if (proto == 0)
1332                 return -EINVAL;
1333
1334         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1335                 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode);
1336                 if (mode < 0)
1337                         return -EINVAL;
1338                 reqid = sa2->sadb_x_sa2_reqid;
1339         } else {
1340                 mode = 0;
1341                 reqid = 0;
1342         }
1343
1344         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1345         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1346
1347         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1348         switch (family) {
1349         case AF_INET:
1350                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1351                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1352                 break;
1353 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1354         case AF_INET6:
1355                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1356                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1357                 break;
1358 #endif
1359         }
1360
1361         if (hdr->sadb_msg_seq) {
1362                 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq);
1363                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1364                         xfrm_state_put(x);
1365                         x = NULL;
1366                 }
1367         }
1368
1369         if (!x)
1370                 x = xfrm_find_acq(net, mode, reqid, proto, xdaddr, xsaddr, 1, family);
1371
1372         if (x == NULL)
1373                 return -ENOENT;
1374
1375         min_spi = 0x100;
1376         max_spi = 0x0fffffff;
1377
1378         range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1379         if (range) {
1380                 min_spi = range->sadb_spirange_min;
1381                 max_spi = range->sadb_spirange_max;
1382         }
1383
1384         err = xfrm_alloc_spi(x, min_spi, max_spi);
1385         resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
1386
1387         if (IS_ERR(resp_skb)) {
1388                 xfrm_state_put(x);
1389                 return  PTR_ERR(resp_skb);
1390         }
1391
1392         out_hdr = (struct sadb_msg *) resp_skb->data;
1393         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1394         out_hdr->sadb_msg_type = SADB_GETSPI;
1395         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1396         out_hdr->sadb_msg_errno = 0;
1397         out_hdr->sadb_msg_reserved = 0;
1398         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1399         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1400
1401         xfrm_state_put(x);
1402
1403         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net);
1404
1405         return 0;
1406 }
1407
1408 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1409 {
1410         struct net *net = sock_net(sk);
1411         struct xfrm_state *x;
1412
1413         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1414                 return -EOPNOTSUPP;
1415
1416         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1417                 return 0;
1418
1419         x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq);
1420         if (x == NULL)
1421                 return 0;
1422
1423         spin_lock_bh(&x->lock);
1424         if (x->km.state == XFRM_STATE_ACQ) {
1425                 x->km.state = XFRM_STATE_ERROR;
1426                 wake_up(&net->xfrm.km_waitq);
1427         }
1428         spin_unlock_bh(&x->lock);
1429         xfrm_state_put(x);
1430         return 0;
1431 }
1432
1433 static inline int event2poltype(int event)
1434 {
1435         switch (event) {
1436         case XFRM_MSG_DELPOLICY:
1437                 return SADB_X_SPDDELETE;
1438         case XFRM_MSG_NEWPOLICY:
1439                 return SADB_X_SPDADD;
1440         case XFRM_MSG_UPDPOLICY:
1441                 return SADB_X_SPDUPDATE;
1442         case XFRM_MSG_POLEXPIRE:
1443         //      return SADB_X_SPDEXPIRE;
1444         default:
1445                 printk("pfkey: Unknown policy event %d\n", event);
1446                 break;
1447         }
1448
1449         return 0;
1450 }
1451
1452 static inline int event2keytype(int event)
1453 {
1454         switch (event) {
1455         case XFRM_MSG_DELSA:
1456                 return SADB_DELETE;
1457         case XFRM_MSG_NEWSA:
1458                 return SADB_ADD;
1459         case XFRM_MSG_UPDSA:
1460                 return SADB_UPDATE;
1461         case XFRM_MSG_EXPIRE:
1462                 return SADB_EXPIRE;
1463         default:
1464                 printk("pfkey: Unknown SA event %d\n", event);
1465                 break;
1466         }
1467
1468         return 0;
1469 }
1470
1471 /* ADD/UPD/DEL */
1472 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1473 {
1474         struct sk_buff *skb;
1475         struct sadb_msg *hdr;
1476
1477         skb = pfkey_xfrm_state2msg(x);
1478
1479         if (IS_ERR(skb))
1480                 return PTR_ERR(skb);
1481
1482         hdr = (struct sadb_msg *) skb->data;
1483         hdr->sadb_msg_version = PF_KEY_V2;
1484         hdr->sadb_msg_type = event2keytype(c->event);
1485         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1486         hdr->sadb_msg_errno = 0;
1487         hdr->sadb_msg_reserved = 0;
1488         hdr->sadb_msg_seq = c->seq;
1489         hdr->sadb_msg_pid = c->pid;
1490
1491         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x));
1492
1493         return 0;
1494 }
1495
1496 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1497 {
1498         struct net *net = sock_net(sk);
1499         struct xfrm_state *x;
1500         int err;
1501         struct km_event c;
1502
1503         x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs);
1504         if (IS_ERR(x))
1505                 return PTR_ERR(x);
1506
1507         xfrm_state_hold(x);
1508         if (hdr->sadb_msg_type == SADB_ADD)
1509                 err = xfrm_state_add(x);
1510         else
1511                 err = xfrm_state_update(x);
1512
1513         xfrm_audit_state_add(x, err ? 0 : 1,
1514                              audit_get_loginuid(current),
1515                              audit_get_sessionid(current), 0);
1516
1517         if (err < 0) {
1518                 x->km.state = XFRM_STATE_DEAD;
1519                 __xfrm_state_put(x);
1520                 goto out;
1521         }
1522
1523         if (hdr->sadb_msg_type == SADB_ADD)
1524                 c.event = XFRM_MSG_NEWSA;
1525         else
1526                 c.event = XFRM_MSG_UPDSA;
1527         c.seq = hdr->sadb_msg_seq;
1528         c.pid = hdr->sadb_msg_pid;
1529         km_state_notify(x, &c);
1530 out:
1531         xfrm_state_put(x);
1532         return err;
1533 }
1534
1535 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1536 {
1537         struct net *net = sock_net(sk);
1538         struct xfrm_state *x;
1539         struct km_event c;
1540         int err;
1541
1542         if (!ext_hdrs[SADB_EXT_SA-1] ||
1543             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1544                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1545                 return -EINVAL;
1546
1547         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1548         if (x == NULL)
1549                 return -ESRCH;
1550
1551         if ((err = security_xfrm_state_delete(x)))
1552                 goto out;
1553
1554         if (xfrm_state_kern(x)) {
1555                 err = -EPERM;
1556                 goto out;
1557         }
1558
1559         err = xfrm_state_delete(x);
1560
1561         if (err < 0)
1562                 goto out;
1563
1564         c.seq = hdr->sadb_msg_seq;
1565         c.pid = hdr->sadb_msg_pid;
1566         c.event = XFRM_MSG_DELSA;
1567         km_state_notify(x, &c);
1568 out:
1569         xfrm_audit_state_delete(x, err ? 0 : 1,
1570                                 audit_get_loginuid(current),
1571                                 audit_get_sessionid(current), 0);
1572         xfrm_state_put(x);
1573
1574         return err;
1575 }
1576
1577 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1578 {
1579         struct net *net = sock_net(sk);
1580         __u8 proto;
1581         struct sk_buff *out_skb;
1582         struct sadb_msg *out_hdr;
1583         struct xfrm_state *x;
1584
1585         if (!ext_hdrs[SADB_EXT_SA-1] ||
1586             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1587                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1588                 return -EINVAL;
1589
1590         x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs);
1591         if (x == NULL)
1592                 return -ESRCH;
1593
1594         out_skb = pfkey_xfrm_state2msg(x);
1595         proto = x->id.proto;
1596         xfrm_state_put(x);
1597         if (IS_ERR(out_skb))
1598                 return  PTR_ERR(out_skb);
1599
1600         out_hdr = (struct sadb_msg *) out_skb->data;
1601         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1602         out_hdr->sadb_msg_type = SADB_GET;
1603         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1604         out_hdr->sadb_msg_errno = 0;
1605         out_hdr->sadb_msg_reserved = 0;
1606         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1607         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1608         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk));
1609
1610         return 0;
1611 }
1612
1613 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1614                                               gfp_t allocation)
1615 {
1616         struct sk_buff *skb;
1617         struct sadb_msg *hdr;
1618         int len, auth_len, enc_len, i;
1619
1620         auth_len = xfrm_count_auth_supported();
1621         if (auth_len) {
1622                 auth_len *= sizeof(struct sadb_alg);
1623                 auth_len += sizeof(struct sadb_supported);
1624         }
1625
1626         enc_len = xfrm_count_enc_supported();
1627         if (enc_len) {
1628                 enc_len *= sizeof(struct sadb_alg);
1629                 enc_len += sizeof(struct sadb_supported);
1630         }
1631
1632         len = enc_len + auth_len + sizeof(struct sadb_msg);
1633
1634         skb = alloc_skb(len + 16, allocation);
1635         if (!skb)
1636                 goto out_put_algs;
1637
1638         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1639         pfkey_hdr_dup(hdr, orig);
1640         hdr->sadb_msg_errno = 0;
1641         hdr->sadb_msg_len = len / sizeof(uint64_t);
1642
1643         if (auth_len) {
1644                 struct sadb_supported *sp;
1645                 struct sadb_alg *ap;
1646
1647                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1648                 ap = (struct sadb_alg *) (sp + 1);
1649
1650                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1651                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1652
1653                 for (i = 0; ; i++) {
1654                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1655                         if (!aalg)
1656                                 break;
1657                         if (aalg->available)
1658                                 *ap++ = aalg->desc;
1659                 }
1660         }
1661
1662         if (enc_len) {
1663                 struct sadb_supported *sp;
1664                 struct sadb_alg *ap;
1665
1666                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1667                 ap = (struct sadb_alg *) (sp + 1);
1668
1669                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1670                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1671
1672                 for (i = 0; ; i++) {
1673                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1674                         if (!ealg)
1675                                 break;
1676                         if (ealg->available)
1677                                 *ap++ = ealg->desc;
1678                 }
1679         }
1680
1681 out_put_algs:
1682         return skb;
1683 }
1684
1685 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1686 {
1687         struct pfkey_sock *pfk = pfkey_sk(sk);
1688         struct sk_buff *supp_skb;
1689
1690         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1691                 return -EINVAL;
1692
1693         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1694                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1695                         return -EEXIST;
1696                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1697         }
1698
1699         xfrm_probe_algs();
1700
1701         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1702         if (!supp_skb) {
1703                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1704                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1705
1706                 return -ENOBUFS;
1707         }
1708
1709         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk));
1710
1711         return 0;
1712 }
1713
1714 static int key_notify_sa_flush(struct km_event *c)
1715 {
1716         struct sk_buff *skb;
1717         struct sadb_msg *hdr;
1718
1719         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1720         if (!skb)
1721                 return -ENOBUFS;
1722         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1723         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1724         hdr->sadb_msg_type = SADB_FLUSH;
1725         hdr->sadb_msg_seq = c->seq;
1726         hdr->sadb_msg_pid = c->pid;
1727         hdr->sadb_msg_version = PF_KEY_V2;
1728         hdr->sadb_msg_errno = (uint8_t) 0;
1729         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1730
1731         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
1732
1733         return 0;
1734 }
1735
1736 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1737 {
1738         struct net *net = sock_net(sk);
1739         unsigned proto;
1740         struct km_event c;
1741         struct xfrm_audit audit_info;
1742         int err;
1743
1744         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1745         if (proto == 0)
1746                 return -EINVAL;
1747
1748         audit_info.loginuid = audit_get_loginuid(current);
1749         audit_info.sessionid = audit_get_sessionid(current);
1750         audit_info.secid = 0;
1751         err = xfrm_state_flush(net, proto, &audit_info);
1752         if (err)
1753                 return err;
1754         c.data.proto = proto;
1755         c.seq = hdr->sadb_msg_seq;
1756         c.pid = hdr->sadb_msg_pid;
1757         c.event = XFRM_MSG_FLUSHSA;
1758         c.net = net;
1759         km_state_notify(NULL, &c);
1760
1761         return 0;
1762 }
1763
1764 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1765 {
1766         struct pfkey_sock *pfk = ptr;
1767         struct sk_buff *out_skb;
1768         struct sadb_msg *out_hdr;
1769
1770         if (!pfkey_can_dump(&pfk->sk))
1771                 return -ENOBUFS;
1772
1773         out_skb = pfkey_xfrm_state2msg(x);
1774         if (IS_ERR(out_skb))
1775                 return PTR_ERR(out_skb);
1776
1777         out_hdr = (struct sadb_msg *) out_skb->data;
1778         out_hdr->sadb_msg_version = pfk->dump.msg_version;
1779         out_hdr->sadb_msg_type = SADB_DUMP;
1780         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1781         out_hdr->sadb_msg_errno = 0;
1782         out_hdr->sadb_msg_reserved = 0;
1783         out_hdr->sadb_msg_seq = count + 1;
1784         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
1785
1786         if (pfk->dump.skb)
1787                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
1788                                 &pfk->sk, sock_net(&pfk->sk));
1789         pfk->dump.skb = out_skb;
1790
1791         return 0;
1792 }
1793
1794 static int pfkey_dump_sa(struct pfkey_sock *pfk)
1795 {
1796         struct net *net = sock_net(&pfk->sk);
1797         return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk);
1798 }
1799
1800 static void pfkey_dump_sa_done(struct pfkey_sock *pfk)
1801 {
1802         xfrm_state_walk_done(&pfk->dump.u.state);
1803 }
1804
1805 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1806 {
1807         u8 proto;
1808         struct pfkey_sock *pfk = pfkey_sk(sk);
1809
1810         if (pfk->dump.dump != NULL)
1811                 return -EBUSY;
1812
1813         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1814         if (proto == 0)
1815                 return -EINVAL;
1816
1817         pfk->dump.msg_version = hdr->sadb_msg_version;
1818         pfk->dump.msg_pid = hdr->sadb_msg_pid;
1819         pfk->dump.dump = pfkey_dump_sa;
1820         pfk->dump.done = pfkey_dump_sa_done;
1821         xfrm_state_walk_init(&pfk->dump.u.state, proto);
1822
1823         return pfkey_do_dump(pfk);
1824 }
1825
1826 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1827 {
1828         struct pfkey_sock *pfk = pfkey_sk(sk);
1829         int satype = hdr->sadb_msg_satype;
1830
1831         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1832                 /* XXX we mangle packet... */
1833                 hdr->sadb_msg_errno = 0;
1834                 if (satype != 0 && satype != 1)
1835                         return -EINVAL;
1836                 pfk->promisc = satype;
1837         }
1838         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk));
1839         return 0;
1840 }
1841
1842 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1843 {
1844         int i;
1845         u32 reqid = *(u32*)ptr;
1846
1847         for (i=0; i<xp->xfrm_nr; i++) {
1848                 if (xp->xfrm_vec[i].reqid == reqid)
1849                         return -EEXIST;
1850         }
1851         return 0;
1852 }
1853
1854 static u32 gen_reqid(struct net *net)
1855 {
1856         struct xfrm_policy_walk walk;
1857         u32 start;
1858         int rc;
1859         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1860
1861         start = reqid;
1862         do {
1863                 ++reqid;
1864                 if (reqid == 0)
1865                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1866                 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN);
1867                 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid);
1868                 xfrm_policy_walk_done(&walk);
1869                 if (rc != -EEXIST)
1870                         return reqid;
1871         } while (reqid != start);
1872         return 0;
1873 }
1874
1875 static int
1876 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1877 {
1878         struct net *net = xp_net(xp);
1879         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1880         int mode;
1881
1882         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1883                 return -ELOOP;
1884
1885         if (rq->sadb_x_ipsecrequest_mode == 0)
1886                 return -EINVAL;
1887
1888         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1889         if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0)
1890                 return -EINVAL;
1891         t->mode = mode;
1892         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1893                 t->optional = 1;
1894         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1895                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1896                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1897                         t->reqid = 0;
1898                 if (!t->reqid && !(t->reqid = gen_reqid(net)))
1899                         return -ENOBUFS;
1900         }
1901
1902         /* addresses present only in tunnel mode */
1903         if (t->mode == XFRM_MODE_TUNNEL) {
1904                 u8 *sa = (u8 *) (rq + 1);
1905                 int family, socklen;
1906
1907                 family = pfkey_sockaddr_extract((struct sockaddr *)sa,
1908                                                 &t->saddr);
1909                 if (!family)
1910                         return -EINVAL;
1911
1912                 socklen = pfkey_sockaddr_len(family);
1913                 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
1914                                            &t->id.daddr) != family)
1915                         return -EINVAL;
1916                 t->encap_family = family;
1917         } else
1918                 t->encap_family = xp->family;
1919
1920         /* No way to set this via kame pfkey */
1921         t->allalgs = 1;
1922         xp->xfrm_nr++;
1923         return 0;
1924 }
1925
1926 static int
1927 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1928 {
1929         int err;
1930         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1931         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1932
1933         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1934                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1935                         return err;
1936                 len -= rq->sadb_x_ipsecrequest_len;
1937                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1938         }
1939         return 0;
1940 }
1941
1942 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1943 {
1944   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1945
1946         if (xfrm_ctx) {
1947                 int len = sizeof(struct sadb_x_sec_ctx);
1948                 len += xfrm_ctx->ctx_len;
1949                 return PFKEY_ALIGN8(len);
1950         }
1951         return 0;
1952 }
1953
1954 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1955 {
1956         struct xfrm_tmpl *t;
1957         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1958         int socklen = 0;
1959         int i;
1960
1961         for (i=0; i<xp->xfrm_nr; i++) {
1962                 t = xp->xfrm_vec + i;
1963                 socklen += pfkey_sockaddr_len(t->encap_family);
1964         }
1965
1966         return sizeof(struct sadb_msg) +
1967                 (sizeof(struct sadb_lifetime) * 3) +
1968                 (sizeof(struct sadb_address) * 2) +
1969                 (sockaddr_size * 2) +
1970                 sizeof(struct sadb_x_policy) +
1971                 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
1972                 (socklen * 2) +
1973                 pfkey_xfrm_policy2sec_ctx_size(xp);
1974 }
1975
1976 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1977 {
1978         struct sk_buff *skb;
1979         int size;
1980
1981         size = pfkey_xfrm_policy2msg_size(xp);
1982
1983         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1984         if (skb == NULL)
1985                 return ERR_PTR(-ENOBUFS);
1986
1987         return skb;
1988 }
1989
1990 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1991 {
1992         struct sadb_msg *hdr;
1993         struct sadb_address *addr;
1994         struct sadb_lifetime *lifetime;
1995         struct sadb_x_policy *pol;
1996         struct sadb_x_sec_ctx *sec_ctx;
1997         struct xfrm_sec_ctx *xfrm_ctx;
1998         int i;
1999         int size;
2000         int sockaddr_size = pfkey_sockaddr_size(xp->family);
2001         int socklen = pfkey_sockaddr_len(xp->family);
2002
2003         size = pfkey_xfrm_policy2msg_size(xp);
2004
2005         /* call should fill header later */
2006         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2007         memset(hdr, 0, size);   /* XXX do we need this ? */
2008
2009         /* src address */
2010         addr = (struct sadb_address*) skb_put(skb,
2011                                               sizeof(struct sadb_address)+sockaddr_size);
2012         addr->sadb_address_len =
2013                 (sizeof(struct sadb_address)+sockaddr_size)/
2014                         sizeof(uint64_t);
2015         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2016         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2017         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
2018         addr->sadb_address_reserved = 0;
2019         if (!pfkey_sockaddr_fill(&xp->selector.saddr,
2020                                  xp->selector.sport,
2021                                  (struct sockaddr *) (addr + 1),
2022                                  xp->family))
2023                 BUG();
2024
2025         /* dst address */
2026         addr = (struct sadb_address*) skb_put(skb,
2027                                               sizeof(struct sadb_address)+sockaddr_size);
2028         addr->sadb_address_len =
2029                 (sizeof(struct sadb_address)+sockaddr_size)/
2030                         sizeof(uint64_t);
2031         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2032         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
2033         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
2034         addr->sadb_address_reserved = 0;
2035
2036         pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport,
2037                             (struct sockaddr *) (addr + 1),
2038                             xp->family);
2039
2040         /* hard time */
2041         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2042                                                      sizeof(struct sadb_lifetime));
2043         lifetime->sadb_lifetime_len =
2044                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2045         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2046         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
2047         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
2048         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
2049         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
2050         /* soft time */
2051         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2052                                                      sizeof(struct sadb_lifetime));
2053         lifetime->sadb_lifetime_len =
2054                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2055         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
2056         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
2057         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
2058         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
2059         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
2060         /* current time */
2061         lifetime = (struct sadb_lifetime *)  skb_put(skb,
2062                                                      sizeof(struct sadb_lifetime));
2063         lifetime->sadb_lifetime_len =
2064                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
2065         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2066         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
2067         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
2068         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
2069         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
2070
2071         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2072         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2073         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2074         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
2075         if (xp->action == XFRM_POLICY_ALLOW) {
2076                 if (xp->xfrm_nr)
2077                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2078                 else
2079                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
2080         }
2081         pol->sadb_x_policy_dir = dir+1;
2082         pol->sadb_x_policy_id = xp->index;
2083         pol->sadb_x_policy_priority = xp->priority;
2084
2085         for (i=0; i<xp->xfrm_nr; i++) {
2086                 struct sadb_x_ipsecrequest *rq;
2087                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
2088                 int req_size;
2089                 int mode;
2090
2091                 req_size = sizeof(struct sadb_x_ipsecrequest);
2092                 if (t->mode == XFRM_MODE_TUNNEL) {
2093                         socklen = pfkey_sockaddr_len(t->encap_family);
2094                         req_size += socklen * 2;
2095                 } else {
2096                         size -= 2*socklen;
2097                 }
2098                 rq = (void*)skb_put(skb, req_size);
2099                 pol->sadb_x_policy_len += req_size/8;
2100                 memset(rq, 0, sizeof(*rq));
2101                 rq->sadb_x_ipsecrequest_len = req_size;
2102                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2103                 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0)
2104                         return -EINVAL;
2105                 rq->sadb_x_ipsecrequest_mode = mode;
2106                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2107                 if (t->reqid)
2108                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2109                 if (t->optional)
2110                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2111                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2112
2113                 if (t->mode == XFRM_MODE_TUNNEL) {
2114                         u8 *sa = (void *)(rq + 1);
2115                         pfkey_sockaddr_fill(&t->saddr, 0,
2116                                             (struct sockaddr *)sa,
2117                                             t->encap_family);
2118                         pfkey_sockaddr_fill(&t->id.daddr, 0,
2119                                             (struct sockaddr *) (sa + socklen),
2120                                             t->encap_family);
2121                 }
2122         }
2123
2124         /* security context */
2125         if ((xfrm_ctx = xp->security)) {
2126                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2127
2128                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2129                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2130                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2131                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2132                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2133                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2134                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2135                        xfrm_ctx->ctx_len);
2136         }
2137
2138         hdr->sadb_msg_len = size / sizeof(uint64_t);
2139         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2140
2141         return 0;
2142 }
2143
2144 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2145 {
2146         struct sk_buff *out_skb;
2147         struct sadb_msg *out_hdr;
2148         int err;
2149
2150         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2151         if (IS_ERR(out_skb)) {
2152                 err = PTR_ERR(out_skb);
2153                 goto out;
2154         }
2155         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2156         if (err < 0)
2157                 return err;
2158
2159         out_hdr = (struct sadb_msg *) out_skb->data;
2160         out_hdr->sadb_msg_version = PF_KEY_V2;
2161
2162         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2163                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2164         else
2165                 out_hdr->sadb_msg_type = event2poltype(c->event);
2166         out_hdr->sadb_msg_errno = 0;
2167         out_hdr->sadb_msg_seq = c->seq;
2168         out_hdr->sadb_msg_pid = c->pid;
2169         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp));
2170 out:
2171         return 0;
2172
2173 }
2174
2175 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2176 {
2177         struct net *net = sock_net(sk);
2178         int err = 0;
2179         struct sadb_lifetime *lifetime;
2180         struct sadb_address *sa;
2181         struct sadb_x_policy *pol;
2182         struct xfrm_policy *xp;
2183         struct km_event c;
2184         struct sadb_x_sec_ctx *sec_ctx;
2185
2186         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2187                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2188             !ext_hdrs[SADB_X_EXT_POLICY-1])
2189                 return -EINVAL;
2190
2191         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2192         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2193                 return -EINVAL;
2194         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2195                 return -EINVAL;
2196
2197         xp = xfrm_policy_alloc(net, GFP_KERNEL);
2198         if (xp == NULL)
2199                 return -ENOBUFS;
2200
2201         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2202                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2203         xp->priority = pol->sadb_x_policy_priority;
2204
2205         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2206         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2207         if (!xp->family) {
2208                 err = -EINVAL;
2209                 goto out;
2210         }
2211         xp->selector.family = xp->family;
2212         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2213         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2214         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2215         if (xp->selector.sport)
2216                 xp->selector.sport_mask = htons(0xffff);
2217
2218         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2219         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2220         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2221
2222         /* Amusing, we set this twice.  KAME apps appear to set same value
2223          * in both addresses.
2224          */
2225         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2226
2227         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2228         if (xp->selector.dport)
2229                 xp->selector.dport_mask = htons(0xffff);
2230
2231         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2232         if (sec_ctx != NULL) {
2233                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2234
2235                 if (!uctx) {
2236                         err = -ENOBUFS;
2237                         goto out;
2238                 }
2239
2240                 err = security_xfrm_policy_alloc(&xp->security, uctx);
2241                 kfree(uctx);
2242
2243                 if (err)
2244                         goto out;
2245         }
2246
2247         xp->lft.soft_byte_limit = XFRM_INF;
2248         xp->lft.hard_byte_limit = XFRM_INF;
2249         xp->lft.soft_packet_limit = XFRM_INF;
2250         xp->lft.hard_packet_limit = XFRM_INF;
2251         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2252                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2253                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2254                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2255                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2256         }
2257         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2258                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2259                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2260                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2261                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2262         }
2263         xp->xfrm_nr = 0;
2264         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2265             (err = parse_ipsecrequests(xp, pol)) < 0)
2266                 goto out;
2267
2268         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2269                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2270
2271         xfrm_audit_policy_add(xp, err ? 0 : 1,
2272                               audit_get_loginuid(current),
2273                               audit_get_sessionid(current), 0);
2274
2275         if (err)
2276                 goto out;
2277
2278         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2279                 c.event = XFRM_MSG_UPDPOLICY;
2280         else
2281                 c.event = XFRM_MSG_NEWPOLICY;
2282
2283         c.seq = hdr->sadb_msg_seq;
2284         c.pid = hdr->sadb_msg_pid;
2285
2286         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2287         xfrm_pol_put(xp);
2288         return 0;
2289
2290 out:
2291         xp->walk.dead = 1;
2292         xfrm_policy_destroy(xp);
2293         return err;
2294 }
2295
2296 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2297 {
2298         struct net *net = sock_net(sk);
2299         int err;
2300         struct sadb_address *sa;
2301         struct sadb_x_policy *pol;
2302         struct xfrm_policy *xp;
2303         struct xfrm_selector sel;
2304         struct km_event c;
2305         struct sadb_x_sec_ctx *sec_ctx;
2306         struct xfrm_sec_ctx *pol_ctx = NULL;
2307
2308         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2309                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2310             !ext_hdrs[SADB_X_EXT_POLICY-1])
2311                 return -EINVAL;
2312
2313         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2314         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2315                 return -EINVAL;
2316
2317         memset(&sel, 0, sizeof(sel));
2318
2319         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2320         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2321         sel.prefixlen_s = sa->sadb_address_prefixlen;
2322         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2323         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2324         if (sel.sport)
2325                 sel.sport_mask = htons(0xffff);
2326
2327         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2328         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2329         sel.prefixlen_d = sa->sadb_address_prefixlen;
2330         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2331         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2332         if (sel.dport)
2333                 sel.dport_mask = htons(0xffff);
2334
2335         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2336         if (sec_ctx != NULL) {
2337                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2338
2339                 if (!uctx)
2340                         return -ENOMEM;
2341
2342                 err = security_xfrm_policy_alloc(&pol_ctx, uctx);
2343                 kfree(uctx);
2344                 if (err)
2345                         return err;
2346         }
2347
2348         xp = xfrm_policy_bysel_ctx(net, XFRM_POLICY_TYPE_MAIN,
2349                                    pol->sadb_x_policy_dir - 1, &sel, pol_ctx,
2350                                    1, &err);
2351         security_xfrm_policy_free(pol_ctx);
2352         if (xp == NULL)
2353                 return -ENOENT;
2354
2355         xfrm_audit_policy_delete(xp, err ? 0 : 1,
2356                                  audit_get_loginuid(current),
2357                                  audit_get_sessionid(current), 0);
2358
2359         if (err)
2360                 goto out;
2361
2362         c.seq = hdr->sadb_msg_seq;
2363         c.pid = hdr->sadb_msg_pid;
2364         c.data.byid = 0;
2365         c.event = XFRM_MSG_DELPOLICY;
2366         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2367
2368 out:
2369         xfrm_pol_put(xp);
2370         return err;
2371 }
2372
2373 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2374 {
2375         int err;
2376         struct sk_buff *out_skb;
2377         struct sadb_msg *out_hdr;
2378         err = 0;
2379
2380         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2381         if (IS_ERR(out_skb)) {
2382                 err =  PTR_ERR(out_skb);
2383                 goto out;
2384         }
2385         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2386         if (err < 0)
2387                 goto out;
2388
2389         out_hdr = (struct sadb_msg *) out_skb->data;
2390         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2391         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2392         out_hdr->sadb_msg_satype = 0;
2393         out_hdr->sadb_msg_errno = 0;
2394         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2395         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2396         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp));
2397         err = 0;
2398
2399 out:
2400         return err;
2401 }
2402
2403 #ifdef CONFIG_NET_KEY_MIGRATE
2404 static int pfkey_sockaddr_pair_size(sa_family_t family)
2405 {
2406         return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2);
2407 }
2408
2409 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len,
2410                                xfrm_address_t *saddr, xfrm_address_t *daddr,
2411                                u16 *family)
2412 {
2413         int af, socklen;
2414
2415         if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family))
2416                 return -EINVAL;
2417
2418         af = pfkey_sockaddr_extract(sa, saddr);
2419         if (!af)
2420                 return -EINVAL;
2421
2422         socklen = pfkey_sockaddr_len(af);
2423         if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen),
2424                                    daddr) != af)
2425                 return -EINVAL;
2426
2427         *family = af;
2428         return 0;
2429 }
2430
2431 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len,
2432                                     struct xfrm_migrate *m)
2433 {
2434         int err;
2435         struct sadb_x_ipsecrequest *rq2;
2436         int mode;
2437
2438         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2439             len < rq1->sadb_x_ipsecrequest_len)
2440                 return -EINVAL;
2441
2442         /* old endoints */
2443         err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1),
2444                                   rq1->sadb_x_ipsecrequest_len,
2445                                   &m->old_saddr, &m->old_daddr,
2446                                   &m->old_family);
2447         if (err)
2448                 return err;
2449
2450         rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len);
2451         len -= rq1->sadb_x_ipsecrequest_len;
2452
2453         if (len <= sizeof(struct sadb_x_ipsecrequest) ||
2454             len < rq2->sadb_x_ipsecrequest_len)
2455                 return -EINVAL;
2456
2457         /* new endpoints */
2458         err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1),
2459                                   rq2->sadb_x_ipsecrequest_len,
2460                                   &m->new_saddr, &m->new_daddr,
2461                                   &m->new_family);
2462         if (err)
2463                 return err;
2464
2465         if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto ||
2466             rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode ||
2467             rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid)
2468                 return -EINVAL;
2469
2470         m->proto = rq1->sadb_x_ipsecrequest_proto;
2471         if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0)
2472                 return -EINVAL;
2473         m->mode = mode;
2474         m->reqid = rq1->sadb_x_ipsecrequest_reqid;
2475
2476         return ((int)(rq1->sadb_x_ipsecrequest_len +
2477                       rq2->sadb_x_ipsecrequest_len));
2478 }
2479
2480 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2481                          struct sadb_msg *hdr, void **ext_hdrs)
2482 {
2483         int i, len, ret, err = -EINVAL;
2484         u8 dir;
2485         struct sadb_address *sa;
2486         struct sadb_x_kmaddress *kma;
2487         struct sadb_x_policy *pol;
2488         struct sadb_x_ipsecrequest *rq;
2489         struct xfrm_selector sel;
2490         struct xfrm_migrate m[XFRM_MAX_DEPTH];
2491         struct xfrm_kmaddress k;
2492
2493         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1],
2494                                      ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) ||
2495             !ext_hdrs[SADB_X_EXT_POLICY - 1]) {
2496                 err = -EINVAL;
2497                 goto out;
2498         }
2499
2500         kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1];
2501         pol = ext_hdrs[SADB_X_EXT_POLICY - 1];
2502
2503         if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) {
2504                 err = -EINVAL;
2505                 goto out;
2506         }
2507
2508         if (kma) {
2509                 /* convert sadb_x_kmaddress to xfrm_kmaddress */
2510                 k.reserved = kma->sadb_x_kmaddress_reserved;
2511                 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1),
2512                                           8*(kma->sadb_x_kmaddress_len) - sizeof(*kma),
2513                                           &k.local, &k.remote, &k.family);
2514                 if (ret < 0) {
2515                         err = ret;
2516                         goto out;
2517                 }
2518         }
2519
2520         dir = pol->sadb_x_policy_dir - 1;
2521         memset(&sel, 0, sizeof(sel));
2522
2523         /* set source address info of selector */
2524         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1];
2525         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2526         sel.prefixlen_s = sa->sadb_address_prefixlen;
2527         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2528         sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2529         if (sel.sport)
2530                 sel.sport_mask = htons(0xffff);
2531
2532         /* set destination address info of selector */
2533         sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1],
2534         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2535         sel.prefixlen_d = sa->sadb_address_prefixlen;
2536         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2537         sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port;
2538         if (sel.dport)
2539                 sel.dport_mask = htons(0xffff);
2540
2541         rq = (struct sadb_x_ipsecrequest *)(pol + 1);
2542
2543         /* extract ipsecrequests */
2544         i = 0;
2545         len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy);
2546
2547         while (len > 0 && i < XFRM_MAX_DEPTH) {
2548                 ret = ipsecrequests_to_migrate(rq, len, &m[i]);
2549                 if (ret < 0) {
2550                         err = ret;
2551                         goto out;
2552                 } else {
2553                         rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret);
2554                         len -= ret;
2555                         i++;
2556                 }
2557         }
2558
2559         if (!i || len > 0) {
2560                 err = -EINVAL;
2561                 goto out;
2562         }
2563
2564         return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i,
2565                             kma ? &k : NULL);
2566
2567  out:
2568         return err;
2569 }
2570 #else
2571 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb,
2572                          struct sadb_msg *hdr, void **ext_hdrs)
2573 {
2574         return -ENOPROTOOPT;
2575 }
2576 #endif
2577
2578
2579 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2580 {
2581         struct net *net = sock_net(sk);
2582         unsigned int dir;
2583         int err = 0, delete;
2584         struct sadb_x_policy *pol;
2585         struct xfrm_policy *xp;
2586         struct km_event c;
2587
2588         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2589                 return -EINVAL;
2590
2591         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2592         if (dir >= XFRM_POLICY_MAX)
2593                 return -EINVAL;
2594
2595         delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2596         xp = xfrm_policy_byid(net, XFRM_POLICY_TYPE_MAIN, dir,
2597                               pol->sadb_x_policy_id, delete, &err);
2598         if (xp == NULL)
2599                 return -ENOENT;
2600
2601         if (delete) {
2602                 xfrm_audit_policy_delete(xp, err ? 0 : 1,
2603                                 audit_get_loginuid(current),
2604                                 audit_get_sessionid(current), 0);
2605
2606                 if (err)
2607                         goto out;
2608                 c.seq = hdr->sadb_msg_seq;
2609                 c.pid = hdr->sadb_msg_pid;
2610                 c.data.byid = 1;
2611                 c.event = XFRM_MSG_DELPOLICY;
2612                 km_policy_notify(xp, dir, &c);
2613         } else {
2614                 err = key_pol_get_resp(sk, xp, hdr, dir);
2615         }
2616
2617 out:
2618         xfrm_pol_put(xp);
2619         return err;
2620 }
2621
2622 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2623 {
2624         struct pfkey_sock *pfk = ptr;
2625         struct sk_buff *out_skb;
2626         struct sadb_msg *out_hdr;
2627         int err;
2628
2629         if (!pfkey_can_dump(&pfk->sk))
2630                 return -ENOBUFS;
2631
2632         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2633         if (IS_ERR(out_skb))
2634                 return PTR_ERR(out_skb);
2635
2636         err = pfkey_xfrm_policy2msg(out_skb, xp, dir);
2637         if (err < 0)
2638                 return err;
2639
2640         out_hdr = (struct sadb_msg *) out_skb->data;
2641         out_hdr->sadb_msg_version = pfk->dump.msg_version;
2642         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2643         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2644         out_hdr->sadb_msg_errno = 0;
2645         out_hdr->sadb_msg_seq = count + 1;
2646         out_hdr->sadb_msg_pid = pfk->dump.msg_pid;
2647
2648         if (pfk->dump.skb)
2649                 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE,
2650                                 &pfk->sk, sock_net(&pfk->sk));
2651         pfk->dump.skb = out_skb;
2652
2653         return 0;
2654 }
2655
2656 static int pfkey_dump_sp(struct pfkey_sock *pfk)
2657 {
2658         struct net *net = sock_net(&pfk->sk);
2659         return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk);
2660 }
2661
2662 static void pfkey_dump_sp_done(struct pfkey_sock *pfk)
2663 {
2664         xfrm_policy_walk_done(&pfk->dump.u.policy);
2665 }
2666
2667 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2668 {
2669         struct pfkey_sock *pfk = pfkey_sk(sk);
2670
2671         if (pfk->dump.dump != NULL)
2672                 return -EBUSY;
2673
2674         pfk->dump.msg_version = hdr->sadb_msg_version;
2675         pfk->dump.msg_pid = hdr->sadb_msg_pid;
2676         pfk->dump.dump = pfkey_dump_sp;
2677         pfk->dump.done = pfkey_dump_sp_done;
2678         xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN);
2679
2680         return pfkey_do_dump(pfk);
2681 }
2682
2683 static int key_notify_policy_flush(struct km_event *c)
2684 {
2685         struct sk_buff *skb_out;
2686         struct sadb_msg *hdr;
2687
2688         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2689         if (!skb_out)
2690                 return -ENOBUFS;
2691         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2692         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2693         hdr->sadb_msg_seq = c->seq;
2694         hdr->sadb_msg_pid = c->pid;
2695         hdr->sadb_msg_version = PF_KEY_V2;
2696         hdr->sadb_msg_errno = (uint8_t) 0;
2697         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2698         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net);
2699         return 0;
2700
2701 }
2702
2703 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2704 {
2705         struct net *net = sock_net(sk);
2706         struct km_event c;
2707         struct xfrm_audit audit_info;
2708         int err;
2709
2710         audit_info.loginuid = audit_get_loginuid(current);
2711         audit_info.sessionid = audit_get_sessionid(current);
2712         audit_info.secid = 0;
2713         err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info);
2714         if (err)
2715                 return err;
2716         c.data.type = XFRM_POLICY_TYPE_MAIN;
2717         c.event = XFRM_MSG_FLUSHPOLICY;
2718         c.pid = hdr->sadb_msg_pid;
2719         c.seq = hdr->sadb_msg_seq;
2720         c.net = net;
2721         km_policy_notify(NULL, 0, &c);
2722
2723         return 0;
2724 }
2725
2726 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2727                              struct sadb_msg *hdr, void **ext_hdrs);
2728 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2729         [SADB_RESERVED]         = pfkey_reserved,
2730         [SADB_GETSPI]           = pfkey_getspi,
2731         [SADB_UPDATE]           = pfkey_add,
2732         [SADB_ADD]              = pfkey_add,
2733         [SADB_DELETE]           = pfkey_delete,
2734         [SADB_GET]              = pfkey_get,
2735         [SADB_ACQUIRE]          = pfkey_acquire,
2736         [SADB_REGISTER]         = pfkey_register,
2737         [SADB_EXPIRE]           = NULL,
2738         [SADB_FLUSH]            = pfkey_flush,
2739         [SADB_DUMP]             = pfkey_dump,
2740         [SADB_X_PROMISC]        = pfkey_promisc,
2741         [SADB_X_PCHANGE]        = NULL,
2742         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2743         [SADB_X_SPDADD]         = pfkey_spdadd,
2744         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2745         [SADB_X_SPDGET]         = pfkey_spdget,
2746         [SADB_X_SPDACQUIRE]     = NULL,
2747         [SADB_X_SPDDUMP]        = pfkey_spddump,
2748         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2749         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2750         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2751         [SADB_X_MIGRATE]        = pfkey_migrate,
2752 };
2753
2754 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2755 {
2756         void *ext_hdrs[SADB_EXT_MAX];
2757         int err;
2758
2759         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2760                         BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
2761
2762         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2763         err = parse_exthdrs(skb, hdr, ext_hdrs);
2764         if (!err) {
2765                 err = -EOPNOTSUPP;
2766                 if (pfkey_funcs[hdr->sadb_msg_type])
2767                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2768         }
2769         return err;
2770 }
2771
2772 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2773 {
2774         struct sadb_msg *hdr = NULL;
2775
2776         if (skb->len < sizeof(*hdr)) {
2777                 *errp = -EMSGSIZE;
2778         } else {
2779                 hdr = (struct sadb_msg *) skb->data;
2780                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2781                     hdr->sadb_msg_reserved != 0 ||
2782                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2783                      hdr->sadb_msg_type > SADB_MAX)) {
2784                         hdr = NULL;
2785                         *errp = -EINVAL;
2786                 } else if (hdr->sadb_msg_len != (skb->len /
2787                                                  sizeof(uint64_t)) ||
2788                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2789                                                 sizeof(uint64_t))) {
2790                         hdr = NULL;
2791                         *errp = -EMSGSIZE;
2792                 } else {
2793                         *errp = 0;
2794                 }
2795         }
2796         return hdr;
2797 }
2798
2799 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2800 {
2801         unsigned int id = d->desc.sadb_alg_id;
2802
2803         if (id >= sizeof(t->aalgos) * 8)
2804                 return 0;
2805
2806         return (t->aalgos >> id) & 1;
2807 }
2808
2809 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2810 {
2811         unsigned int id = d->desc.sadb_alg_id;
2812
2813         if (id >= sizeof(t->ealgos) * 8)
2814                 return 0;
2815
2816         return (t->ealgos >> id) & 1;
2817 }
2818
2819 static int count_ah_combs(struct xfrm_tmpl *t)
2820 {
2821         int i, sz = 0;
2822
2823         for (i = 0; ; i++) {
2824                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2825                 if (!aalg)
2826                         break;
2827                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2828                         sz += sizeof(struct sadb_comb);
2829         }
2830         return sz + sizeof(struct sadb_prop);
2831 }
2832
2833 static int count_esp_combs(struct xfrm_tmpl *t)
2834 {
2835         int i, k, sz = 0;
2836
2837         for (i = 0; ; i++) {
2838                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2839                 if (!ealg)
2840                         break;
2841
2842                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2843                         continue;
2844
2845                 for (k = 1; ; k++) {
2846                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2847                         if (!aalg)
2848                                 break;
2849
2850                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2851                                 sz += sizeof(struct sadb_comb);
2852                 }
2853         }
2854         return sz + sizeof(struct sadb_prop);
2855 }
2856
2857 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2858 {
2859         struct sadb_prop *p;
2860         int i;
2861
2862         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2863         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2864         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2865         p->sadb_prop_replay = 32;
2866         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2867
2868         for (i = 0; ; i++) {
2869                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2870                 if (!aalg)
2871                         break;
2872
2873                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2874                         struct sadb_comb *c;
2875                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2876                         memset(c, 0, sizeof(*c));
2877                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2878                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2879                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2880                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2881                         c->sadb_comb_hard_addtime = 24*60*60;
2882                         c->sadb_comb_soft_addtime = 20*60*60;
2883                         c->sadb_comb_hard_usetime = 8*60*60;
2884                         c->sadb_comb_soft_usetime = 7*60*60;
2885                 }
2886         }
2887 }
2888
2889 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2890 {
2891         struct sadb_prop *p;
2892         int i, k;
2893
2894         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2895         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2896         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2897         p->sadb_prop_replay = 32;
2898         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2899
2900         for (i=0; ; i++) {
2901                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2902                 if (!ealg)
2903                         break;
2904
2905                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2906                         continue;
2907
2908                 for (k = 1; ; k++) {
2909                         struct sadb_comb *c;
2910                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2911                         if (!aalg)
2912                                 break;
2913                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2914                                 continue;
2915                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2916                         memset(c, 0, sizeof(*c));
2917                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2918                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2919                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2920                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2921                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2922                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2923                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2924                         c->sadb_comb_hard_addtime = 24*60*60;
2925                         c->sadb_comb_soft_addtime = 20*60*60;
2926                         c->sadb_comb_hard_usetime = 8*60*60;
2927                         c->sadb_comb_soft_usetime = 7*60*60;
2928                 }
2929         }
2930 }
2931
2932 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2933 {
2934         return 0;
2935 }
2936
2937 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2938 {
2939         struct sk_buff *out_skb;
2940         struct sadb_msg *out_hdr;
2941         int hard;
2942         int hsc;
2943
2944         hard = c->data.hard;
2945         if (hard)
2946                 hsc = 2;
2947         else
2948                 hsc = 1;
2949
2950         out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
2951         if (IS_ERR(out_skb))
2952                 return PTR_ERR(out_skb);
2953
2954         out_hdr = (struct sadb_msg *) out_skb->data;
2955         out_hdr->sadb_msg_version = PF_KEY_V2;
2956         out_hdr->sadb_msg_type = SADB_EXPIRE;
2957         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2958         out_hdr->sadb_msg_errno = 0;
2959         out_hdr->sadb_msg_reserved = 0;
2960         out_hdr->sadb_msg_seq = 0;
2961         out_hdr->sadb_msg_pid = 0;
2962
2963         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
2964         return 0;
2965 }
2966
2967 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2968 {
2969         struct net *net = x ? xs_net(x) : c->net;
2970         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
2971
2972         if (atomic_read(&net_pfkey->socks_nr) == 0)
2973                 return 0;
2974
2975         switch (c->event) {
2976         case XFRM_MSG_EXPIRE:
2977                 return key_notify_sa_expire(x, c);
2978         case XFRM_MSG_DELSA:
2979         case XFRM_MSG_NEWSA:
2980         case XFRM_MSG_UPDSA:
2981                 return key_notify_sa(x, c);
2982         case XFRM_MSG_FLUSHSA:
2983                 return key_notify_sa_flush(c);
2984         case XFRM_MSG_NEWAE: /* not yet supported */
2985                 break;
2986         default:
2987                 printk("pfkey: Unknown SA event %d\n", c->event);
2988                 break;
2989         }
2990
2991         return 0;
2992 }
2993
2994 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2995 {
2996         if (xp && xp->type != XFRM_POLICY_TYPE_MAIN)
2997                 return 0;
2998
2999         switch (c->event) {
3000         case XFRM_MSG_POLEXPIRE:
3001                 return key_notify_policy_expire(xp, c);
3002         case XFRM_MSG_DELPOLICY:
3003         case XFRM_MSG_NEWPOLICY:
3004         case XFRM_MSG_UPDPOLICY:
3005                 return key_notify_policy(xp, dir, c);
3006         case XFRM_MSG_FLUSHPOLICY:
3007                 if (c->data.type != XFRM_POLICY_TYPE_MAIN)
3008                         break;
3009                 return key_notify_policy_flush(c);
3010         default:
3011                 printk("pfkey: Unknown policy event %d\n", c->event);
3012                 break;
3013         }
3014
3015         return 0;
3016 }
3017
3018 static u32 get_acqseq(void)
3019 {
3020         u32 res;
3021         static u32 acqseq;
3022         static DEFINE_SPINLOCK(acqseq_lock);
3023
3024         spin_lock_bh(&acqseq_lock);
3025         res = (++acqseq ? : ++acqseq);
3026         spin_unlock_bh(&acqseq_lock);
3027         return res;
3028 }
3029
3030 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
3031 {
3032         struct sk_buff *skb;
3033         struct sadb_msg *hdr;
3034         struct sadb_address *addr;
3035         struct sadb_x_policy *pol;
3036         int sockaddr_size;
3037         int size;
3038         struct sadb_x_sec_ctx *sec_ctx;
3039         struct xfrm_sec_ctx *xfrm_ctx;
3040         int ctx_size = 0;
3041
3042         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3043         if (!sockaddr_size)
3044                 return -EINVAL;
3045
3046         size = sizeof(struct sadb_msg) +
3047                 (sizeof(struct sadb_address) * 2) +
3048                 (sockaddr_size * 2) +
3049                 sizeof(struct sadb_x_policy);
3050
3051         if (x->id.proto == IPPROTO_AH)
3052                 size += count_ah_combs(t);
3053         else if (x->id.proto == IPPROTO_ESP)
3054                 size += count_esp_combs(t);
3055
3056         if ((xfrm_ctx = x->security)) {
3057                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
3058                 size +=  sizeof(struct sadb_x_sec_ctx) + ctx_size;
3059         }
3060
3061         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3062         if (skb == NULL)
3063                 return -ENOMEM;
3064
3065         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3066         hdr->sadb_msg_version = PF_KEY_V2;
3067         hdr->sadb_msg_type = SADB_ACQUIRE;
3068         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
3069         hdr->sadb_msg_len = size / sizeof(uint64_t);
3070         hdr->sadb_msg_errno = 0;
3071         hdr->sadb_msg_reserved = 0;
3072         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3073         hdr->sadb_msg_pid = 0;
3074
3075         /* src address */
3076         addr = (struct sadb_address*) skb_put(skb,
3077                                               sizeof(struct sadb_address)+sockaddr_size);
3078         addr->sadb_address_len =
3079                 (sizeof(struct sadb_address)+sockaddr_size)/
3080                         sizeof(uint64_t);
3081         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3082         addr->sadb_address_proto = 0;
3083         addr->sadb_address_reserved = 0;
3084         addr->sadb_address_prefixlen =
3085                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3086                                     (struct sockaddr *) (addr + 1),
3087                                     x->props.family);
3088         if (!addr->sadb_address_prefixlen)
3089                 BUG();
3090
3091         /* dst address */
3092         addr = (struct sadb_address*) skb_put(skb,
3093                                               sizeof(struct sadb_address)+sockaddr_size);
3094         addr->sadb_address_len =
3095                 (sizeof(struct sadb_address)+sockaddr_size)/
3096                         sizeof(uint64_t);
3097         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3098         addr->sadb_address_proto = 0;
3099         addr->sadb_address_reserved = 0;
3100         addr->sadb_address_prefixlen =
3101                 pfkey_sockaddr_fill(&x->id.daddr, 0,
3102                                     (struct sockaddr *) (addr + 1),
3103                                     x->props.family);
3104         if (!addr->sadb_address_prefixlen)
3105                 BUG();
3106
3107         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
3108         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
3109         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3110         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3111         pol->sadb_x_policy_dir = dir+1;
3112         pol->sadb_x_policy_id = xp->index;
3113
3114         /* Set sadb_comb's. */
3115         if (x->id.proto == IPPROTO_AH)
3116                 dump_ah_combs(skb, t);
3117         else if (x->id.proto == IPPROTO_ESP)
3118                 dump_esp_combs(skb, t);
3119
3120         /* security context */
3121         if (xfrm_ctx) {
3122                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
3123                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
3124                 sec_ctx->sadb_x_sec_len =
3125                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
3126                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
3127                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
3128                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
3129                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
3130                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
3131                        xfrm_ctx->ctx_len);
3132         }
3133
3134         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3135 }
3136
3137 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
3138                                                 u8 *data, int len, int *dir)
3139 {
3140         struct net *net = sock_net(sk);
3141         struct xfrm_policy *xp;
3142         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
3143         struct sadb_x_sec_ctx *sec_ctx;
3144
3145         switch (sk->sk_family) {
3146         case AF_INET:
3147                 if (opt != IP_IPSEC_POLICY) {
3148                         *dir = -EOPNOTSUPP;
3149                         return NULL;
3150                 }
3151                 break;
3152 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3153         case AF_INET6:
3154                 if (opt != IPV6_IPSEC_POLICY) {
3155                         *dir = -EOPNOTSUPP;
3156                         return NULL;
3157                 }
3158                 break;
3159 #endif
3160         default:
3161                 *dir = -EINVAL;
3162                 return NULL;
3163         }
3164
3165         *dir = -EINVAL;
3166
3167         if (len < sizeof(struct sadb_x_policy) ||
3168             pol->sadb_x_policy_len*8 > len ||
3169             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
3170             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
3171                 return NULL;
3172
3173         xp = xfrm_policy_alloc(net, GFP_ATOMIC);
3174         if (xp == NULL) {
3175                 *dir = -ENOBUFS;
3176                 return NULL;
3177         }
3178
3179         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
3180                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
3181
3182         xp->lft.soft_byte_limit = XFRM_INF;
3183         xp->lft.hard_byte_limit = XFRM_INF;
3184         xp->lft.soft_packet_limit = XFRM_INF;
3185         xp->lft.hard_packet_limit = XFRM_INF;
3186         xp->family = sk->sk_family;
3187
3188         xp->xfrm_nr = 0;
3189         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
3190             (*dir = parse_ipsecrequests(xp, pol)) < 0)
3191                 goto out;
3192
3193         /* security context too */
3194         if (len >= (pol->sadb_x_policy_len*8 +
3195             sizeof(struct sadb_x_sec_ctx))) {
3196                 char *p = (char *)pol;
3197                 struct xfrm_user_sec_ctx *uctx;
3198
3199                 p += pol->sadb_x_policy_len*8;
3200                 sec_ctx = (struct sadb_x_sec_ctx *)p;
3201                 if (len < pol->sadb_x_policy_len*8 +
3202                     sec_ctx->sadb_x_sec_len) {
3203                         *dir = -EINVAL;
3204                         goto out;
3205                 }
3206                 if ((*dir = verify_sec_ctx_len(p)))
3207                         goto out;
3208                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
3209                 *dir = security_xfrm_policy_alloc(&xp->security, uctx);
3210                 kfree(uctx);
3211
3212                 if (*dir)
3213                         goto out;
3214         }
3215
3216         *dir = pol->sadb_x_policy_dir-1;
3217         return xp;
3218
3219 out:
3220         xp->walk.dead = 1;
3221         xfrm_policy_destroy(xp);
3222         return NULL;
3223 }
3224
3225 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
3226 {
3227         struct sk_buff *skb;
3228         struct sadb_msg *hdr;
3229         struct sadb_sa *sa;
3230         struct sadb_address *addr;
3231         struct sadb_x_nat_t_port *n_port;
3232         int sockaddr_size;
3233         int size;
3234         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
3235         struct xfrm_encap_tmpl *natt = NULL;
3236
3237         sockaddr_size = pfkey_sockaddr_size(x->props.family);
3238         if (!sockaddr_size)
3239                 return -EINVAL;
3240
3241         if (!satype)
3242                 return -EINVAL;
3243
3244         if (!x->encap)
3245                 return -EINVAL;
3246
3247         natt = x->encap;
3248
3249         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
3250          *
3251          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
3252          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
3253          */
3254
3255         size = sizeof(struct sadb_msg) +
3256                 sizeof(struct sadb_sa) +
3257                 (sizeof(struct sadb_address) * 2) +
3258                 (sockaddr_size * 2) +
3259                 (sizeof(struct sadb_x_nat_t_port) * 2);
3260
3261         skb =  alloc_skb(size + 16, GFP_ATOMIC);
3262         if (skb == NULL)
3263                 return -ENOMEM;
3264
3265         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
3266         hdr->sadb_msg_version = PF_KEY_V2;
3267         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
3268         hdr->sadb_msg_satype = satype;
3269         hdr->sadb_msg_len = size / sizeof(uint64_t);
3270         hdr->sadb_msg_errno = 0;
3271         hdr->sadb_msg_reserved = 0;
3272         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
3273         hdr->sadb_msg_pid = 0;
3274
3275         /* SA */
3276         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
3277         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
3278         sa->sadb_sa_exttype = SADB_EXT_SA;
3279         sa->sadb_sa_spi = x->id.spi;
3280         sa->sadb_sa_replay = 0;
3281         sa->sadb_sa_state = 0;
3282         sa->sadb_sa_auth = 0;
3283         sa->sadb_sa_encrypt = 0;
3284         sa->sadb_sa_flags = 0;
3285
3286         /* ADDRESS_SRC (old addr) */
3287         addr = (struct sadb_address*)
3288                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3289         addr->sadb_address_len =
3290                 (sizeof(struct sadb_address)+sockaddr_size)/
3291                         sizeof(uint64_t);
3292         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
3293         addr->sadb_address_proto = 0;
3294         addr->sadb_address_reserved = 0;
3295         addr->sadb_address_prefixlen =
3296                 pfkey_sockaddr_fill(&x->props.saddr, 0,
3297                                     (struct sockaddr *) (addr + 1),
3298                                     x->props.family);
3299         if (!addr->sadb_address_prefixlen)
3300                 BUG();
3301
3302         /* NAT_T_SPORT (old port) */
3303         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3304         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3305         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3306         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3307         n_port->sadb_x_nat_t_port_reserved = 0;
3308
3309         /* ADDRESS_DST (new addr) */
3310         addr = (struct sadb_address*)
3311                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3312         addr->sadb_address_len =
3313                 (sizeof(struct sadb_address)+sockaddr_size)/
3314                         sizeof(uint64_t);
3315         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3316         addr->sadb_address_proto = 0;
3317         addr->sadb_address_reserved = 0;
3318         addr->sadb_address_prefixlen =
3319                 pfkey_sockaddr_fill(ipaddr, 0,
3320                                     (struct sockaddr *) (addr + 1),
3321                                     x->props.family);
3322         if (!addr->sadb_address_prefixlen)
3323                 BUG();
3324
3325         /* NAT_T_DPORT (new port) */
3326         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3327         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3328         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3329         n_port->sadb_x_nat_t_port_port = sport;
3330         n_port->sadb_x_nat_t_port_reserved = 0;
3331
3332         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x));
3333 }
3334
3335 #ifdef CONFIG_NET_KEY_MIGRATE
3336 static int set_sadb_address(struct sk_buff *skb, int sasize, int type,
3337                             struct xfrm_selector *sel)
3338 {
3339         struct sadb_address *addr;
3340         addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize);
3341         addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8;
3342         addr->sadb_address_exttype = type;
3343         addr->sadb_address_proto = sel->proto;
3344         addr->sadb_address_reserved = 0;
3345
3346         switch (type) {
3347         case SADB_EXT_ADDRESS_SRC:
3348                 addr->sadb_address_prefixlen = sel->prefixlen_s;
3349                 pfkey_sockaddr_fill(&sel->saddr, 0,
3350                                     (struct sockaddr *)(addr + 1),
3351                                     sel->family);
3352                 break;
3353         case SADB_EXT_ADDRESS_DST:
3354                 addr->sadb_address_prefixlen = sel->prefixlen_d;
3355                 pfkey_sockaddr_fill(&sel->daddr, 0,
3356                                     (struct sockaddr *)(addr + 1),
3357                                     sel->family);
3358                 break;
3359         default:
3360                 return -EINVAL;
3361         }
3362
3363         return 0;
3364 }
3365
3366
3367 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k)
3368 {
3369         struct sadb_x_kmaddress *kma;
3370         u8 *sa;
3371         int family = k->family;
3372         int socklen = pfkey_sockaddr_len(family);
3373         int size_req;
3374
3375         size_req = (sizeof(struct sadb_x_kmaddress) +
3376                     pfkey_sockaddr_pair_size(family));
3377
3378         kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req);
3379         memset(kma, 0, size_req);
3380         kma->sadb_x_kmaddress_len = size_req / 8;
3381         kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS;
3382         kma->sadb_x_kmaddress_reserved = k->reserved;
3383
3384         sa = (u8 *)(kma + 1);
3385         if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) ||
3386             !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family))
3387                 return -EINVAL;
3388
3389         return 0;
3390 }
3391
3392 static int set_ipsecrequest(struct sk_buff *skb,
3393                             uint8_t proto, uint8_t mode, int level,
3394                             uint32_t reqid, uint8_t family,
3395                             xfrm_address_t *src, xfrm_address_t *dst)
3396 {
3397         struct sadb_x_ipsecrequest *rq;
3398         u8 *sa;
3399         int socklen = pfkey_sockaddr_len(family);
3400         int size_req;
3401
3402         size_req = sizeof(struct sadb_x_ipsecrequest) +
3403                    pfkey_sockaddr_pair_size(family);
3404
3405         rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req);
3406         memset(rq, 0, size_req);
3407         rq->sadb_x_ipsecrequest_len = size_req;
3408         rq->sadb_x_ipsecrequest_proto = proto;
3409         rq->sadb_x_ipsecrequest_mode = mode;
3410         rq->sadb_x_ipsecrequest_level = level;
3411         rq->sadb_x_ipsecrequest_reqid = reqid;
3412
3413         sa = (u8 *) (rq + 1);
3414         if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) ||
3415             !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family))
3416                 return -EINVAL;
3417
3418         return 0;
3419 }
3420 #endif
3421
3422 #ifdef CONFIG_NET_KEY_MIGRATE
3423 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3424                               struct xfrm_migrate *m, int num_bundles,
3425                               struct xfrm_kmaddress *k)
3426 {
3427         int i;
3428         int sasize_sel;
3429         int size = 0;
3430         int size_pol = 0;
3431         struct sk_buff *skb;
3432         struct sadb_msg *hdr;
3433         struct sadb_x_policy *pol;
3434         struct xfrm_migrate *mp;
3435
3436         if (type != XFRM_POLICY_TYPE_MAIN)
3437                 return 0;
3438
3439         if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH)
3440                 return -EINVAL;
3441
3442         if (k != NULL) {
3443                 /* addresses for KM */
3444                 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) +
3445                                      pfkey_sockaddr_pair_size(k->family));
3446         }
3447
3448         /* selector */
3449         sasize_sel = pfkey_sockaddr_size(sel->family);
3450         if (!sasize_sel)
3451                 return -EINVAL;
3452         size += (sizeof(struct sadb_address) + sasize_sel) * 2;
3453
3454         /* policy info */
3455         size_pol += sizeof(struct sadb_x_policy);
3456
3457         /* ipsecrequests */
3458         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3459                 /* old locator pair */
3460                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3461                             pfkey_sockaddr_pair_size(mp->old_family);
3462                 /* new locator pair */
3463                 size_pol += sizeof(struct sadb_x_ipsecrequest) +
3464                             pfkey_sockaddr_pair_size(mp->new_family);
3465         }
3466
3467         size += sizeof(struct sadb_msg) + size_pol;
3468
3469         /* alloc buffer */
3470         skb = alloc_skb(size, GFP_ATOMIC);
3471         if (skb == NULL)
3472                 return -ENOMEM;
3473
3474         hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg));
3475         hdr->sadb_msg_version = PF_KEY_V2;
3476         hdr->sadb_msg_type = SADB_X_MIGRATE;
3477         hdr->sadb_msg_satype = pfkey_proto2satype(m->proto);
3478         hdr->sadb_msg_len = size / 8;
3479         hdr->sadb_msg_errno = 0;
3480         hdr->sadb_msg_reserved = 0;
3481         hdr->sadb_msg_seq = 0;
3482         hdr->sadb_msg_pid = 0;
3483
3484         /* Addresses to be used by KM for negotiation, if ext is available */
3485         if (k != NULL && (set_sadb_kmaddress(skb, k) < 0))
3486                 return -EINVAL;
3487
3488         /* selector src */
3489         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel);
3490
3491         /* selector dst */
3492         set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel);
3493
3494         /* policy information */
3495         pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy));
3496         pol->sadb_x_policy_len = size_pol / 8;
3497         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3498         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
3499         pol->sadb_x_policy_dir = dir + 1;
3500         pol->sadb_x_policy_id = 0;
3501         pol->sadb_x_policy_priority = 0;
3502
3503         for (i = 0, mp = m; i < num_bundles; i++, mp++) {
3504                 /* old ipsecrequest */
3505                 int mode = pfkey_mode_from_xfrm(mp->mode);
3506                 if (mode < 0)
3507                         goto err;
3508                 if (set_ipsecrequest(skb, mp->proto, mode,
3509                                      (mp->reqid ?  IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3510                                      mp->reqid, mp->old_family,
3511                                      &mp->old_saddr, &mp->old_daddr) < 0)
3512                         goto err;
3513
3514                 /* new ipsecrequest */
3515                 if (set_ipsecrequest(skb, mp->proto, mode,
3516                                      (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE),
3517                                      mp->reqid, mp->new_family,
3518                                      &mp->new_saddr, &mp->new_daddr) < 0)
3519                         goto err;
3520         }
3521
3522         /* broadcast migrate message to sockets */
3523         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net);
3524
3525         return 0;
3526
3527 err:
3528         kfree_skb(skb);
3529         return -EINVAL;
3530 }
3531 #else
3532 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
3533                               struct xfrm_migrate *m, int num_bundles,
3534                               struct xfrm_kmaddress *k)
3535 {
3536         return -ENOPROTOOPT;
3537 }
3538 #endif
3539
3540 static int pfkey_sendmsg(struct kiocb *kiocb,
3541                          struct socket *sock, struct msghdr *msg, size_t len)
3542 {
3543         struct sock *sk = sock->sk;
3544         struct sk_buff *skb = NULL;
3545         struct sadb_msg *hdr = NULL;
3546         int err;
3547
3548         err = -EOPNOTSUPP;
3549         if (msg->msg_flags & MSG_OOB)
3550                 goto out;
3551
3552         err = -EMSGSIZE;
3553         if ((unsigned)len > sk->sk_sndbuf - 32)
3554                 goto out;
3555
3556         err = -ENOBUFS;
3557         skb = alloc_skb(len, GFP_KERNEL);
3558         if (skb == NULL)
3559                 goto out;
3560
3561         err = -EFAULT;
3562         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3563                 goto out;
3564
3565         hdr = pfkey_get_base_msg(skb, &err);
3566         if (!hdr)
3567                 goto out;
3568
3569         mutex_lock(&xfrm_cfg_mutex);
3570         err = pfkey_process(sk, skb, hdr);
3571         mutex_unlock(&xfrm_cfg_mutex);
3572
3573 out:
3574         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3575                 err = 0;
3576         kfree_skb(skb);
3577
3578         return err ? : len;
3579 }
3580
3581 static int pfkey_recvmsg(struct kiocb *kiocb,
3582                          struct socket *sock, struct msghdr *msg, size_t len,
3583                          int flags)
3584 {
3585         struct sock *sk = sock->sk;
3586         struct pfkey_sock *pfk = pfkey_sk(sk);
3587         struct sk_buff *skb;
3588         int copied, err;
3589
3590         err = -EINVAL;
3591         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3592                 goto out;
3593
3594         msg->msg_namelen = 0;
3595         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3596         if (skb == NULL)
3597                 goto out;
3598
3599         copied = skb->len;
3600         if (copied > len) {
3601                 msg->msg_flags |= MSG_TRUNC;
3602                 copied = len;
3603         }
3604
3605         skb_reset_transport_header(skb);
3606         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3607         if (err)
3608                 goto out_free;
3609
3610         sock_recv_ts_and_drops(msg, sk, skb);
3611
3612         err = (flags & MSG_TRUNC) ? skb->len : copied;
3613
3614         if (pfk->dump.dump != NULL &&
3615             3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf)
3616                 pfkey_do_dump(pfk);
3617
3618 out_free:
3619         skb_free_datagram(sk, skb);
3620 out:
3621         return err;
3622 }
3623
3624 static const struct proto_ops pfkey_ops = {
3625         .family         =       PF_KEY,
3626         .owner          =       THIS_MODULE,
3627         /* Operations that make no sense on pfkey sockets. */
3628         .bind           =       sock_no_bind,
3629         .connect        =       sock_no_connect,
3630         .socketpair     =       sock_no_socketpair,
3631         .accept         =       sock_no_accept,
3632         .getname        =       sock_no_getname,
3633         .ioctl          =       sock_no_ioctl,
3634         .listen         =       sock_no_listen,
3635         .shutdown       =       sock_no_shutdown,
3636         .setsockopt     =       sock_no_setsockopt,
3637         .getsockopt     =       sock_no_getsockopt,
3638         .mmap           =       sock_no_mmap,
3639         .sendpage       =       sock_no_sendpage,
3640
3641         /* Now the operations that really occur. */
3642         .release        =       pfkey_release,
3643         .poll           =       datagram_poll,
3644         .sendmsg        =       pfkey_sendmsg,
3645         .recvmsg        =       pfkey_recvmsg,
3646 };
3647
3648 static const struct net_proto_family pfkey_family_ops = {
3649         .family =       PF_KEY,
3650         .create =       pfkey_create,
3651         .owner  =       THIS_MODULE,
3652 };
3653
3654 #ifdef CONFIG_PROC_FS
3655 static int pfkey_seq_show(struct seq_file *f, void *v)
3656 {
3657         struct sock *s;
3658
3659         s = (struct sock *)v;
3660         if (v == SEQ_START_TOKEN)
3661                 seq_printf(f ,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3662         else
3663                 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n",
3664                                s,
3665                                atomic_read(&s->sk_refcnt),
3666                                sk_rmem_alloc_get(s),
3667                                sk_wmem_alloc_get(s),
3668                                sock_i_uid(s),
3669                                sock_i_ino(s)
3670                                );
3671         return 0;
3672 }
3673
3674 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos)
3675 {
3676         struct net *net = seq_file_net(f);
3677         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3678         struct sock *s;
3679         struct hlist_node *node;
3680         loff_t pos = *ppos;
3681
3682         read_lock(&pfkey_table_lock);
3683         if (pos == 0)
3684                 return SEQ_START_TOKEN;
3685
3686         sk_for_each(s, node, &net_pfkey->table)
3687                 if (pos-- == 1)
3688                         return s;
3689
3690         return NULL;
3691 }
3692
3693 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos)
3694 {
3695         struct net *net = seq_file_net(f);
3696         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3697
3698         ++*ppos;
3699         return (v == SEQ_START_TOKEN) ?
3700                 sk_head(&net_pfkey->table) :
3701                         sk_next((struct sock *)v);
3702 }
3703
3704 static void pfkey_seq_stop(struct seq_file *f, void *v)
3705 {
3706         read_unlock(&pfkey_table_lock);
3707 }
3708
3709 static const struct seq_operations pfkey_seq_ops = {
3710         .start  = pfkey_seq_start,
3711         .next   = pfkey_seq_next,
3712         .stop   = pfkey_seq_stop,
3713         .show   = pfkey_seq_show,
3714 };
3715
3716 static int pfkey_seq_open(struct inode *inode, struct file *file)
3717 {
3718         return seq_open_net(inode, file, &pfkey_seq_ops,
3719                             sizeof(struct seq_net_private));
3720 }
3721
3722 static const struct file_operations pfkey_proc_ops = {
3723         .open    = pfkey_seq_open,
3724         .read    = seq_read,
3725         .llseek  = seq_lseek,
3726         .release = seq_release_net,
3727 };
3728
3729 static int __net_init pfkey_init_proc(struct net *net)
3730 {
3731         struct proc_dir_entry *e;
3732
3733         e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops);
3734         if (e == NULL)
3735                 return -ENOMEM;
3736
3737         return 0;
3738 }
3739
3740 static void pfkey_exit_proc(struct net *net)
3741 {
3742         proc_net_remove(net, "pfkey");
3743 }
3744 #else
3745 static int __net_init pfkey_init_proc(struct net *net)
3746 {
3747         return 0;
3748 }
3749
3750 static void pfkey_exit_proc(struct net *net)
3751 {
3752 }
3753 #endif
3754
3755 static struct xfrm_mgr pfkeyv2_mgr =
3756 {
3757         .id             = "pfkeyv2",
3758         .notify         = pfkey_send_notify,
3759         .acquire        = pfkey_send_acquire,
3760         .compile_policy = pfkey_compile_policy,
3761         .new_mapping    = pfkey_send_new_mapping,
3762         .notify_policy  = pfkey_send_policy_notify,
3763         .migrate        = pfkey_send_migrate,
3764 };
3765
3766 static int __net_init pfkey_net_init(struct net *net)
3767 {
3768         struct netns_pfkey *net_pfkey;
3769         int rv;
3770
3771         net_pfkey = kmalloc(sizeof(struct netns_pfkey), GFP_KERNEL);
3772         if (!net_pfkey) {
3773                 rv = -ENOMEM;
3774                 goto out_kmalloc;
3775         }
3776         INIT_HLIST_HEAD(&net_pfkey->table);
3777         atomic_set(&net_pfkey->socks_nr, 0);
3778         rv = net_assign_generic(net, pfkey_net_id, net_pfkey);
3779         if (rv < 0)
3780                 goto out_assign;
3781         rv = pfkey_init_proc(net);
3782         if (rv < 0)
3783                 goto out_proc;
3784         return 0;
3785
3786 out_proc:
3787 out_assign:
3788         kfree(net_pfkey);
3789 out_kmalloc:
3790         return rv;
3791 }
3792
3793 static void __net_exit pfkey_net_exit(struct net *net)
3794 {
3795         struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
3796
3797         pfkey_exit_proc(net);
3798         BUG_ON(!hlist_empty(&net_pfkey->table));
3799         kfree(net_pfkey);
3800 }
3801
3802 static struct pernet_operations pfkey_net_ops = {
3803         .init = pfkey_net_init,
3804         .exit = pfkey_net_exit,
3805 };
3806
3807 static void __exit ipsec_pfkey_exit(void)
3808 {
3809         unregister_pernet_gen_subsys(pfkey_net_id, &pfkey_net_ops);
3810         xfrm_unregister_km(&pfkeyv2_mgr);
3811         sock_unregister(PF_KEY);
3812         proto_unregister(&key_proto);
3813 }
3814
3815 static int __init ipsec_pfkey_init(void)
3816 {
3817         int err = proto_register(&key_proto, 0);
3818
3819         if (err != 0)
3820                 goto out;
3821
3822         err = sock_register(&pfkey_family_ops);
3823         if (err != 0)
3824                 goto out_unregister_key_proto;
3825         err = xfrm_register_km(&pfkeyv2_mgr);
3826         if (err != 0)
3827                 goto out_sock_unregister;
3828         err = register_pernet_gen_subsys(&pfkey_net_id, &pfkey_net_ops);
3829         if (err != 0)
3830                 goto out_xfrm_unregister_km;
3831 out:
3832         return err;
3833 out_xfrm_unregister_km:
3834         xfrm_unregister_km(&pfkeyv2_mgr);
3835 out_sock_unregister:
3836         sock_unregister(PF_KEY);
3837 out_unregister_key_proto:
3838         proto_unregister(&key_proto);
3839         goto out;
3840 }
3841
3842 module_init(ipsec_pfkey_init);
3843 module_exit(ipsec_pfkey_exit);
3844 MODULE_LICENSE("GPL");
3845 MODULE_ALIAS_NETPROTO(PF_KEY);