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/config.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/xfrm.h>
  30
  31 #include <net/sock.h>
  32
  33 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  34 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  35
  36
  37 /* List of all pfkey sockets. */
  38 HLIST_HEAD(pfkey_table);
  39 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  40 static rwlock_t pfkey_table_lock = RW_LOCK_UNLOCKED;
  41 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
  42
  43 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
  44
  45 struct pfkey_opt {
  46         int     registered;
  47         int     promisc;
  48 };
  49 #define pfkey_sk(__sk) ((struct pfkey_opt *)(__sk)->sk_protinfo)
  50
  51 static void pfkey_sock_destruct(struct sock *sk)
  52 {
  53         skb_queue_purge(&sk->sk_receive_queue);
  54
  55         if (!sock_flag(sk, SOCK_DEAD)) {
  56                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  57                 return;
  58         }
  59
  60         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
  61         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
  62
  63         kfree(pfkey_sk(sk));
  64
  65         atomic_dec(&pfkey_socks_nr);
  66 }
  67
  68 static void pfkey_table_grab(void)
  69 {
  70         write_lock_bh(&pfkey_table_lock);
  71
  72         if (atomic_read(&pfkey_table_users)) {
  73                 DECLARE_WAITQUEUE(wait, current);
  74
  75                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
  76                 for(;;) {
  77                         set_current_state(TASK_UNINTERRUPTIBLE);
  78                         if (atomic_read(&pfkey_table_users) == 0)
  79                                 break;
  80                         write_unlock_bh(&pfkey_table_lock);
  81                         schedule();
  82                         write_lock_bh(&pfkey_table_lock);
  83                 }
  84
  85                 __set_current_state(TASK_RUNNING);
  86                 remove_wait_queue(&pfkey_table_wait, &wait);
  87         }
  88 }
  89
  90 static __inline__ void pfkey_table_ungrab(void)
  91 {
  92         write_unlock_bh(&pfkey_table_lock);
  93         wake_up(&pfkey_table_wait);
  94 }
  95
  96 static __inline__ void pfkey_lock_table(void)
  97 {
  98         /* read_lock() synchronizes us to pfkey_table_grab */
  99
 100         read_lock(&pfkey_table_lock);
 101         atomic_inc(&pfkey_table_users);
 102         read_unlock(&pfkey_table_lock);
 103 }
 104
 105 static __inline__ void pfkey_unlock_table(void)
 106 {
 107         if (atomic_dec_and_test(&pfkey_table_users))
 108                 wake_up(&pfkey_table_wait);
 109 }
 110
 111
 112 static struct proto_ops pfkey_ops;
 113
 114 static void pfkey_insert(struct sock *sk)
 115 {
 116         pfkey_table_grab();
 117         sk_add_node(sk, &pfkey_table);
 118         pfkey_table_ungrab();
 119 }
 120
 121 static void pfkey_remove(struct sock *sk)
 122 {
 123         pfkey_table_grab();
 124         sk_del_node_init(sk);
 125         pfkey_table_ungrab();
 126 }
 127
 128 static int pfkey_create(struct socket *sock, int protocol)
 129 {
 130         struct sock *sk;
 131         struct pfkey_opt *pfk;
 132         int err;
 133
 134         if (!capable(CAP_NET_ADMIN))
 135                 return -EPERM;
 136         if (sock->type != SOCK_RAW)
 137                 return -ESOCKTNOSUPPORT;
 138         if (protocol != PF_KEY_V2)
 139                 return -EPROTONOSUPPORT;
 140
 141         err = -ENOMEM;
 142         sk = sk_alloc(PF_KEY, GFP_KERNEL, 1, NULL);
 143         if (sk == NULL)
 144                 goto out;
 145
 146         sock->ops = &pfkey_ops;
 147         sock_init_data(sock, sk);
 148         sk_set_owner(sk, THIS_MODULE);
 149
 150         err = -ENOMEM;
 151         pfk = sk->sk_protinfo = kmalloc(sizeof(*pfk), GFP_KERNEL);
 152         if (!pfk) {
 153                 sk_free(sk);
 154                 goto out;
 155         }
 156         memset(pfk, 0, sizeof(*pfk));
 157
 158         sk->sk_family = PF_KEY;
 159         sk->sk_destruct = pfkey_sock_destruct;
 160
 161         atomic_inc(&pfkey_socks_nr);
 162
 163         pfkey_insert(sk);
 164
 165         return 0;
 166 out:
 167         return err;
 168 }
 169
 170 static int pfkey_release(struct socket *sock)
 171 {
 172         struct sock *sk = sock->sk;
 173
 174         if (!sk)
 175                 return 0;
 176
 177         pfkey_remove(sk);
 178
 179         sock_orphan(sk);
 180         sock->sk = NULL;
 181         skb_queue_purge(&sk->sk_write_queue);
 182         sock_put(sk);
 183
 184         return 0;
 185 }
 186
 187 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 188                                int allocation, struct sock *sk)
 189 {
 190         int err = -ENOBUFS;
 191
 192         sock_hold(sk);
 193         if (*skb2 == NULL) {
 194                 if (atomic_read(&skb->users) != 1) {
 195                         *skb2 = skb_clone(skb, allocation);
 196                 } else {
 197                         *skb2 = skb;
 198                         atomic_inc(&skb->users);
 199                 }
 200         }
 201         if (*skb2 != NULL) {
 202                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 203                         skb_orphan(*skb2);
 204                         skb_set_owner_r(*skb2, sk);
 205                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 206                         sk->sk_data_ready(sk, (*skb2)->len);
 207                         *skb2 = NULL;
 208                         err = 0;
 209                 }
 210         }
 211         sock_put(sk);
 212         return err;
 213 }
 214
 215 /* Send SKB to all pfkey sockets matching selected criteria.  */
 216 #define BROADCAST_ALL           0
 217 #define BROADCAST_ONE           1
 218 #define BROADCAST_REGISTERED    2
 219 #define BROADCAST_PROMISC_ONLY  4
 220 static int pfkey_broadcast(struct sk_buff *skb, int allocation,
 221                            int broadcast_flags, struct sock *one_sk)
 222 {
 223         struct sock *sk;
 224         struct hlist_node *node;
 225         struct sk_buff *skb2 = NULL;
 226         int err = -ESRCH;
 227
 228         /* XXX Do we need something like netlink_overrun?  I think
 229          * XXX PF_KEY socket apps will not mind current behavior.
 230          */
 231         if (!skb)
 232                 return -ENOMEM;
 233
 234         pfkey_lock_table();
 235         sk_for_each(sk, node, &pfkey_table) {
 236                 struct pfkey_opt *pfk = pfkey_sk(sk);
 237                 int err2;
 238
 239                 /* Yes, it means that if you are meant to receive this
 240                  * pfkey message you receive it twice as promiscuous
 241                  * socket.
 242                  */
 243                 if (pfk->promisc)
 244                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 245
 246                 /* the exact target will be processed later */
 247                 if (sk == one_sk)
 248                         continue;
 249                 if (broadcast_flags != BROADCAST_ALL) {
 250                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 251                                 continue;
 252                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 253                             !pfk->registered)
 254                                 continue;
 255                         if (broadcast_flags & BROADCAST_ONE)
 256                                 continue;
 257                 }
 258
 259                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 260
 261                 /* Error is cleare after succecful sending to at least one
 262                  * registered KM */
 263                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 264                         err = err2;
 265         }
 266         pfkey_unlock_table();
 267
 268         if (one_sk != NULL)
 269                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 270
 271         if (skb2)
 272                 kfree_skb(skb2);
 273         kfree_skb(skb);
 274         return err;
 275 }
 276
 277 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 278 {
 279         *new = *orig;
 280 }
 281
 282 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 283 {
 284         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 285         struct sadb_msg *hdr;
 286
 287         if (!skb)
 288                 return -ENOBUFS;
 289
 290         /* Woe be to the platform trying to support PFKEY yet
 291          * having normal errnos outside the 1-255 range, inclusive.
 292          */
 293         err = -err;
 294         if (err == ERESTARTSYS ||
 295             err == ERESTARTNOHAND ||
 296             err == ERESTARTNOINTR)
 297                 err = EINTR;
 298         if (err >= 512)
 299                 err = EINVAL;
 300         if (err <= 0 || err >= 256)
 301                 BUG();
 302
 303         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 304         pfkey_hdr_dup(hdr, orig);
 305         hdr->sadb_msg_errno = (uint8_t) err;
 306         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 307                              sizeof(uint64_t));
 308
 309         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 310
 311         return 0;
 312 }
 313
 314 static u8 sadb_ext_min_len[] = {
 315         [SADB_EXT_RESERVED]             = (u8) 0,
 316         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 317         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 318         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 319         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 320         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 321         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 322         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 323         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 324         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 325         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 326         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 327         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 328         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 329         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 330         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 331         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 332         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 333         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 334         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 335         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 336         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 337         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 338         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 339 };
 340
 341 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 342 static int verify_address_len(void *p)
 343 {
 344         struct sadb_address *sp = p;
 345         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 346         struct sockaddr_in *sin;
 347 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 348         struct sockaddr_in6 *sin6;
 349 #endif
 350         int len;
 351
 352         switch (addr->sa_family) {
 353         case AF_INET:
 354                 len  = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1);
 355                 len /= sizeof(uint64_t);
 356                 if (sp->sadb_address_len != len ||
 357                     sp->sadb_address_prefixlen > 32)
 358                         return -EINVAL;
 359                 break;
 360 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 361         case AF_INET6:
 362                 len  = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1);
 363                 len /= sizeof(uint64_t);
 364                 if (sp->sadb_address_len != len ||
 365                     sp->sadb_address_prefixlen > 128)
 366                         return -EINVAL;
 367                 break;
 368 #endif
 369         default:
 370                 /* It is user using kernel to keep track of security
 371                  * associations for another protocol, such as
 372                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 373                  * lengths.
 374                  *
 375                  * XXX Actually, association/policy database is not yet
 376                  * XXX able to cope with arbitrary sockaddr families.
 377                  * XXX When it can, remove this -EINVAL.  -DaveM
 378                  */
 379                 return -EINVAL;
 380                 break;
 381         };
 382
 383         return 0;
 384 }
 385
 386 static int present_and_same_family(struct sadb_address *src,
 387                                    struct sadb_address *dst)
 388 {
 389         struct sockaddr *s_addr, *d_addr;
 390
 391         if (!src || !dst)
 392                 return 0;
 393
 394         s_addr = (struct sockaddr *)(src + 1);
 395         d_addr = (struct sockaddr *)(dst + 1);
 396         if (s_addr->sa_family != d_addr->sa_family)
 397                 return 0;
 398         if (s_addr->sa_family != AF_INET
 399 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 400             && s_addr->sa_family != AF_INET6
 401 #endif
 402                 )
 403                 return 0;
 404
 405         return 1;
 406 }
 407
 408 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 409 {
 410         char *p = (char *) hdr;
 411         int len = skb->len;
 412
 413         len -= sizeof(*hdr);
 414         p += sizeof(*hdr);
 415         while (len > 0) {
 416                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 417                 uint16_t ext_type;
 418                 int ext_len;
 419
 420                 ext_len  = ehdr->sadb_ext_len;
 421                 ext_len *= sizeof(uint64_t);
 422                 ext_type = ehdr->sadb_ext_type;
 423                 if (ext_len < sizeof(uint64_t) ||
 424                     ext_len > len ||
 425                     ext_type == SADB_EXT_RESERVED)
 426                         return -EINVAL;
 427
 428                 if (ext_type <= SADB_EXT_MAX) {
 429                         int min = (int) sadb_ext_min_len[ext_type];
 430                         if (ext_len < min)
 431                                 return -EINVAL;
 432                         if (ext_hdrs[ext_type-1] != NULL)
 433                                 return -EINVAL;
 434                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 435                             ext_type == SADB_EXT_ADDRESS_DST ||
 436                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 437                             ext_type == SADB_X_EXT_NAT_T_OA) {
 438                                 if (verify_address_len(p))
 439                                         return -EINVAL;
 440                         }
 441                         ext_hdrs[ext_type-1] = p;
 442                 }
 443                 p   += ext_len;
 444                 len -= ext_len;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static uint16_t
 451 pfkey_satype2proto(uint8_t satype)
 452 {
 453         switch (satype) {
 454         case SADB_SATYPE_UNSPEC:
 455                 return IPSEC_PROTO_ANY;
 456         case SADB_SATYPE_AH:
 457                 return IPPROTO_AH;
 458         case SADB_SATYPE_ESP:
 459                 return IPPROTO_ESP;
 460         case SADB_X_SATYPE_IPCOMP:
 461                 return IPPROTO_COMP;
 462                 break;
 463         default:
 464                 return 0;
 465         }
 466         /* NOTREACHED */
 467 }
 468
 469 static uint8_t
 470 pfkey_proto2satype(uint16_t proto)
 471 {
 472         switch (proto) {
 473         case IPPROTO_AH:
 474                 return SADB_SATYPE_AH;
 475         case IPPROTO_ESP:
 476                 return SADB_SATYPE_ESP;
 477         case IPPROTO_COMP:
 478                 return SADB_X_SATYPE_IPCOMP;
 479                 break;
 480         default:
 481                 return 0;
 482         }
 483         /* NOTREACHED */
 484 }
 485
 486 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 487  * say specifically 'just raw sockets' as we encode them as 255.
 488  */
 489
 490 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 491 {
 492         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 493 }
 494
 495 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 496 {
 497         return (proto ? proto : IPSEC_PROTO_ANY);
 498 }
 499
 500 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 501                                      xfrm_address_t *xaddr)
 502 {
 503         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 504         case AF_INET:
 505                 xaddr->a4 =
 506                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 507                 return AF_INET;
 508 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 509         case AF_INET6:
 510                 memcpy(xaddr->a6,
 511                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 512                        sizeof(struct in6_addr));
 513                 return AF_INET6;
 514 #endif
 515         default:
 516                 return 0;
 517         }
 518         /* NOTREACHED */
 519 }
 520
 521 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 522 {
 523         struct sadb_sa *sa;
 524         struct sadb_address *addr;
 525         uint16_t proto;
 526         unsigned short family;
 527         xfrm_address_t *xaddr;
 528
 529         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 530         if (sa == NULL)
 531                 return NULL;
 532
 533         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 534         if (proto == 0)
 535                 return NULL;
 536
 537         /* sadb_address_len should be checked by caller */
 538         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 539         if (addr == NULL)
 540                 return NULL;
 541
 542         family = ((struct sockaddr *)(addr + 1))->sa_family;
 543         switch (family) {
 544         case AF_INET:
 545                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 546                 break;
 547 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 548         case AF_INET6:
 549                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 550                 break;
 551 #endif
 552         default:
 553                 xaddr = NULL;
 554         }
 555
 556         if (!xaddr)
 557                 return NULL;
 558
 559         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 560 }
 561
 562 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 563 static int
 564 pfkey_sockaddr_size(sa_family_t family)
 565 {
 566         switch (family) {
 567         case AF_INET:
 568                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
 569 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 570         case AF_INET6:
 571                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
 572 #endif
 573         default:
 574                 return 0;
 575         }
 576         /* NOTREACHED */
 577 }
 578
 579 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
 580 {
 581         struct sk_buff *skb;
 582         struct sadb_msg *hdr;
 583         struct sadb_sa *sa;
 584         struct sadb_lifetime *lifetime;
 585         struct sadb_address *addr;
 586         struct sadb_key *key;
 587         struct sadb_x_sa2 *sa2;
 588         struct sockaddr_in *sin;
 589 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 590         struct sockaddr_in6 *sin6;
 591 #endif
 592         int size;
 593         int auth_key_size = 0;
 594         int encrypt_key_size = 0;
 595         int sockaddr_size;
 596         struct xfrm_encap_tmpl *natt = NULL;
 597
 598         /* address family check */
 599         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 600         if (!sockaddr_size)
 601                 ERR_PTR(-EINVAL);
 602
 603         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 604            key(AE), (identity(SD),) (sensitivity)> */
 605         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 606                 sizeof(struct sadb_lifetime) +
 607                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 608                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 609                         sizeof(struct sadb_address)*2 +
 610                                 sockaddr_size*2 +
 611                                         sizeof(struct sadb_x_sa2);
 612         /* identity & sensitivity */
 613
 614         if ((x->props.family == AF_INET &&
 615              x->sel.saddr.a4 != x->props.saddr.a4)
 616 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 617             || (x->props.family == AF_INET6 &&
 618                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 619 #endif
 620                 )
 621                 size += sizeof(struct sadb_address) + sockaddr_size;
 622
 623         if (add_keys) {
 624                 if (x->aalg && x->aalg->alg_key_len) {
 625                         auth_key_size =
 626                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 627                         size += sizeof(struct sadb_key) + auth_key_size;
 628                 }
 629                 if (x->ealg && x->ealg->alg_key_len) {
 630                         encrypt_key_size =
 631                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 632                         size += sizeof(struct sadb_key) + encrypt_key_size;
 633                 }
 634         }
 635         if (x->encap)
 636                 natt = x->encap;
 637
 638         if (natt && natt->encap_type) {
 639                 size += sizeof(struct sadb_x_nat_t_type);
 640                 size += sizeof(struct sadb_x_nat_t_port);
 641                 size += sizeof(struct sadb_x_nat_t_port);
 642         }
 643
 644         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 645         if (skb == NULL)
 646                 return ERR_PTR(-ENOBUFS);
 647
 648         /* call should fill header later */
 649         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 650         memset(hdr, 0, size);   /* XXX do we need this ? */
 651         hdr->sadb_msg_len = size / sizeof(uint64_t);
 652
 653         /* sa */
 654         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 655         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 656         sa->sadb_sa_exttype = SADB_EXT_SA;
 657         sa->sadb_sa_spi = x->id.spi;
 658         sa->sadb_sa_replay = x->props.replay_window;
 659         sa->sadb_sa_state = SADB_SASTATE_DYING;
 660         if (x->km.state == XFRM_STATE_VALID && !x->km.dying)
 661                 sa->sadb_sa_state = SADB_SASTATE_MATURE;
 662         else if (x->km.state == XFRM_STATE_ACQ)
 663                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 664         else if (x->km.state == XFRM_STATE_EXPIRED)
 665                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 666         sa->sadb_sa_auth = 0;
 667         if (x->aalg) {
 668                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name);
 669                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 670         }
 671         sa->sadb_sa_encrypt = 0;
 672         BUG_ON(x->ealg && x->calg);
 673         if (x->ealg) {
 674                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name);
 675                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 676         }
 677         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 678         if (x->calg) {
 679                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name);
 680                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 681         }
 682
 683         sa->sadb_sa_flags = 0;
 684         if (x->props.flags & XFRM_STATE_NOECN)
 685                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 686
 687         /* hard time */
 688         if (hsc & 2) {
 689                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 690                                                              sizeof(struct sadb_lifetime));
 691                 lifetime->sadb_lifetime_len =
 692                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 693                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 694                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 695                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 696                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 697                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 698         }
 699         /* soft time */
 700         if (hsc & 1) {
 701                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 702                                                              sizeof(struct sadb_lifetime));
 703                 lifetime->sadb_lifetime_len =
 704                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 705                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 706                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 707                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 708                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 709                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 710         }
 711         /* current time */
 712         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 713                                                      sizeof(struct sadb_lifetime));
 714         lifetime->sadb_lifetime_len =
 715                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 716         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 717         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 718         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 719         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 720         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 721         /* src address */
 722         addr = (struct sadb_address*) skb_put(skb,
 723                                               sizeof(struct sadb_address)+sockaddr_size);
 724         addr->sadb_address_len =
 725                 (sizeof(struct sadb_address)+sockaddr_size)/
 726                         sizeof(uint64_t);
 727         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 728         /* "if the ports are non-zero, then the sadb_address_proto field,
 729            normally zero, MUST be filled in with the transport
 730            protocol's number." - RFC2367 */
 731         addr->sadb_address_proto = 0;
 732         addr->sadb_address_reserved = 0;
 733         if (x->props.family == AF_INET) {
 734                 addr->sadb_address_prefixlen = 32;
 735
 736                 sin = (struct sockaddr_in *) (addr + 1);
 737                 sin->sin_family = AF_INET;
 738                 sin->sin_addr.s_addr = x->props.saddr.a4;
 739                 sin->sin_port = 0;
 740                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 741         }
 742 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 743         else if (x->props.family == AF_INET6) {
 744                 addr->sadb_address_prefixlen = 128;
 745
 746                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 747                 sin6->sin6_family = AF_INET6;
 748                 sin6->sin6_port = 0;
 749                 sin6->sin6_flowinfo = 0;
 750                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 751                        sizeof(struct in6_addr));
 752                 sin6->sin6_scope_id = 0;
 753         }
 754 #endif
 755         else
 756                 BUG();
 757
 758         /* dst address */
 759         addr = (struct sadb_address*) skb_put(skb,
 760                                               sizeof(struct sadb_address)+sockaddr_size);
 761         addr->sadb_address_len =
 762                 (sizeof(struct sadb_address)+sockaddr_size)/
 763                         sizeof(uint64_t);
 764         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 765         addr->sadb_address_proto = 0;
 766         addr->sadb_address_prefixlen = 32; /* XXX */
 767         addr->sadb_address_reserved = 0;
 768         if (x->props.family == AF_INET) {
 769                 sin = (struct sockaddr_in *) (addr + 1);
 770                 sin->sin_family = AF_INET;
 771                 sin->sin_addr.s_addr = x->id.daddr.a4;
 772                 sin->sin_port = 0;
 773                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 774
 775                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 776                         addr = (struct sadb_address*) skb_put(skb,
 777                                 sizeof(struct sadb_address)+sockaddr_size);
 778                         addr->sadb_address_len =
 779                                 (sizeof(struct sadb_address)+sockaddr_size)/
 780                                 sizeof(uint64_t);
 781                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 782                         addr->sadb_address_proto =
 783                                 pfkey_proto_from_xfrm(x->sel.proto);
 784                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 785                         addr->sadb_address_reserved = 0;
 786
 787                         sin = (struct sockaddr_in *) (addr + 1);
 788                         sin->sin_family = AF_INET;
 789                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 790                         sin->sin_port = x->sel.sport;
 791                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 792                 }
 793         }
 794 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 795         else if (x->props.family == AF_INET6) {
 796                 addr->sadb_address_prefixlen = 128;
 797
 798                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 799                 sin6->sin6_family = AF_INET6;
 800                 sin6->sin6_port = 0;
 801                 sin6->sin6_flowinfo = 0;
 802                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 803                 sin6->sin6_scope_id = 0;
 804
 805                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 806                             sizeof(struct in6_addr))) {
 807                         addr = (struct sadb_address *) skb_put(skb,
 808                                 sizeof(struct sadb_address)+sockaddr_size);
 809                         addr->sadb_address_len =
 810                                 (sizeof(struct sadb_address)+sockaddr_size)/
 811                                 sizeof(uint64_t);
 812                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 813                         addr->sadb_address_proto =
 814                                 pfkey_proto_from_xfrm(x->sel.proto);
 815                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 816                         addr->sadb_address_reserved = 0;
 817
 818                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 819                         sin6->sin6_family = AF_INET6;
 820                         sin6->sin6_port = x->sel.sport;
 821                         sin6->sin6_flowinfo = 0;
 822                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 823                                sizeof(struct in6_addr));
 824                         sin6->sin6_scope_id = 0;
 825                 }
 826         }
 827 #endif
 828         else
 829                 BUG();
 830
 831         /* auth key */
 832         if (add_keys && auth_key_size) {
 833                 key = (struct sadb_key *) skb_put(skb,
 834                                                   sizeof(struct sadb_key)+auth_key_size);
 835                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 836                         sizeof(uint64_t);
 837                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 838                 key->sadb_key_bits = x->aalg->alg_key_len;
 839                 key->sadb_key_reserved = 0;
 840                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 841         }
 842         /* encrypt key */
 843         if (add_keys && encrypt_key_size) {
 844                 key = (struct sadb_key *) skb_put(skb,
 845                                                   sizeof(struct sadb_key)+encrypt_key_size);
 846                 key->sadb_key_len = (sizeof(struct sadb_key) +
 847                                      encrypt_key_size) / sizeof(uint64_t);
 848                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 849                 key->sadb_key_bits = x->ealg->alg_key_len;
 850                 key->sadb_key_reserved = 0;
 851                 memcpy(key + 1, x->ealg->alg_key,
 852                        (x->ealg->alg_key_len+7)/8);
 853         }
 854
 855         /* sa */
 856         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 857         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 858         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 859         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 860         sa2->sadb_x_sa2_reserved1 = 0;
 861         sa2->sadb_x_sa2_reserved2 = 0;
 862         sa2->sadb_x_sa2_sequence = 0;
 863         sa2->sadb_x_sa2_reqid = x->props.reqid;
 864
 865         if (natt && natt->encap_type) {
 866                 struct sadb_x_nat_t_type *n_type;
 867                 struct sadb_x_nat_t_port *n_port;
 868
 869                 /* type */
 870                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 871                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 872                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 873                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 874                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 875                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 876                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 877
 878                 /* source port */
 879                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 880                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 881                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 882                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 883                 n_port->sadb_x_nat_t_port_reserved = 0;
 884
 885                 /* dest port */
 886                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 887                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 888                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 889                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 890                 n_port->sadb_x_nat_t_port_reserved = 0;
 891         }
 892
 893         return skb;
 894 }
 895
 896 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 897                                                 void **ext_hdrs)
 898 {
 899         struct xfrm_state *x;
 900         struct sadb_lifetime *lifetime;
 901         struct sadb_sa *sa;
 902         struct sadb_key *key;
 903         uint16_t proto;
 904         int err;
 905
 906
 907         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 908         if (!sa ||
 909             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 910                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 911                 return ERR_PTR(-EINVAL);
 912         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
 913             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
 914                 return ERR_PTR(-EINVAL);
 915         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
 916             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
 917                 return ERR_PTR(-EINVAL);
 918         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
 919             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
 920                 return ERR_PTR(-EINVAL);
 921
 922         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 923         if (proto == 0)
 924                 return ERR_PTR(-EINVAL);
 925
 926         /* default error is no buffer space */
 927         err = -ENOBUFS;
 928
 929         /* RFC2367:
 930
 931    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
 932    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
 933    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
 934    Therefore, the sadb_sa_state field of all submitted SAs MUST be
 935    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
 936    not true.
 937
 938            However, KAME setkey always uses SADB_SASTATE_LARVAL.
 939            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
 940          */
 941         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
 942             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
 943              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
 944             sa->sadb_sa_encrypt > SADB_EALG_MAX)
 945                 return ERR_PTR(-EINVAL);
 946         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 947         if (key != NULL &&
 948             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
 949             ((key->sadb_key_bits+7) / 8 == 0 ||
 950              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 951                 return ERR_PTR(-EINVAL);
 952         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
 953         if (key != NULL &&
 954             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
 955             ((key->sadb_key_bits+7) / 8 == 0 ||
 956              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 957                 return ERR_PTR(-EINVAL);
 958
 959         x = xfrm_state_alloc();
 960         if (x == NULL)
 961                 return ERR_PTR(-ENOBUFS);
 962
 963         x->id.proto = proto;
 964         x->id.spi = sa->sadb_sa_spi;
 965         x->props.replay_window = sa->sadb_sa_replay;
 966         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
 967                 x->props.flags |= XFRM_STATE_NOECN;
 968
 969         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
 970         if (lifetime != NULL) {
 971                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 972                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 973                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 974                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 975         }
 976         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
 977         if (lifetime != NULL) {
 978                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 979                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 980                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 981                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 982         }
 983         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 984         if (sa->sadb_sa_auth) {
 985                 int keysize = 0;
 986                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
 987                 if (!a) {
 988                         err = -ENOSYS;
 989                         goto out;
 990                 }
 991                 if (key)
 992                         keysize = (key->sadb_key_bits + 7) / 8;
 993                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
 994                 if (!x->aalg)
 995                         goto out;
 996                 strcpy(x->aalg->alg_name, a->name);
 997                 x->aalg->alg_key_len = 0;
 998                 if (key) {
 999                         x->aalg->alg_key_len = key->sadb_key_bits;
1000                         memcpy(x->aalg->alg_key, key+1, keysize);
1001                 }
1002                 x->props.aalgo = sa->sadb_sa_auth;
1003                 /* x->algo.flags = sa->sadb_sa_flags; */
1004         }
1005         if (sa->sadb_sa_encrypt) {
1006                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1007                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1008                         if (!a) {
1009                                 err = -ENOSYS;
1010                                 goto out;
1011                         }
1012                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1013                         if (!x->calg)
1014                                 goto out;
1015                         strcpy(x->calg->alg_name, a->name);
1016                         x->props.calgo = sa->sadb_sa_encrypt;
1017                 } else {
1018                         int keysize = 0;
1019                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1020                         if (!a) {
1021                                 err = -ENOSYS;
1022                                 goto out;
1023                         }
1024                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1025                         if (key)
1026                                 keysize = (key->sadb_key_bits + 7) / 8;
1027                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1028                         if (!x->ealg)
1029                                 goto out;
1030                         strcpy(x->ealg->alg_name, a->name);
1031                         x->ealg->alg_key_len = 0;
1032                         if (key) {
1033                                 x->ealg->alg_key_len = key->sadb_key_bits;
1034                                 memcpy(x->ealg->alg_key, key+1, keysize);
1035                         }
1036                         x->props.ealgo = sa->sadb_sa_encrypt;
1037                 }
1038         }
1039         /* x->algo.flags = sa->sadb_sa_flags; */
1040
1041         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1042                                                     &x->props.saddr);
1043         if (!x->props.family) {
1044                 err = -EAFNOSUPPORT;
1045                 goto out;
1046         }
1047         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1048                                   &x->id.daddr);
1049
1050         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1051                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1052                 x->props.mode = sa2->sadb_x_sa2_mode;
1053                 if (x->props.mode)
1054                         x->props.mode--;
1055                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1056         }
1057
1058         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1059                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1060
1061                 /* Nobody uses this, but we try. */
1062                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1063                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1064         }
1065
1066         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1067                 struct sadb_x_nat_t_type* n_type;
1068                 struct xfrm_encap_tmpl *natt;
1069
1070                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1071                 if (!x->encap)
1072                         goto out;
1073
1074                 natt = x->encap;
1075                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1076                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1077
1078                 switch (natt->encap_type) {
1079                 case UDP_ENCAP_ESPINUDP:
1080                 case UDP_ENCAP_ESPINUDP_NON_IKE:
1081                         break;
1082                 default:
1083                         err = -ENOPROTOOPT;
1084                         goto out;
1085                 }
1086
1087                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1088                         struct sadb_x_nat_t_port* n_port =
1089                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1090                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1091                 }
1092                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1093                         struct sadb_x_nat_t_port* n_port =
1094                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1095                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1096                 }
1097         }
1098
1099         x->type = xfrm_get_type(proto, x->props.family);
1100         if (x->type == NULL) {
1101                 err = -ENOPROTOOPT;
1102                 goto out;
1103         }
1104         if (x->type->init_state(x, NULL)) {
1105                 err = -EINVAL;
1106                 goto out;
1107         }
1108         x->km.seq = hdr->sadb_msg_seq;
1109         x->km.state = XFRM_STATE_VALID;
1110         return x;
1111
1112 out:
1113         x->km.state = XFRM_STATE_DEAD;
1114         xfrm_state_put(x);
1115         return ERR_PTR(err);
1116 }
1117
1118 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1119 {
1120         return -EOPNOTSUPP;
1121 }
1122
1123 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1124 {
1125         struct sk_buff *resp_skb;
1126         struct sadb_x_sa2 *sa2;
1127         struct sadb_address *saddr, *daddr;
1128         struct sadb_msg *out_hdr;
1129         struct xfrm_state *x = NULL;
1130         u8 mode;
1131         u32 reqid;
1132         u8 proto;
1133         unsigned short family;
1134         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1135
1136         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1137                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1138                 return -EINVAL;
1139
1140         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1141         if (proto == 0)
1142                 return -EINVAL;
1143
1144         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1145                 mode = sa2->sadb_x_sa2_mode - 1;
1146                 reqid = sa2->sadb_x_sa2_reqid;
1147         } else {
1148                 mode = 0;
1149                 reqid = 0;
1150         }
1151
1152         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1153         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1154
1155         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1156         switch (family) {
1157         case AF_INET:
1158                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1159                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1160                 break;
1161 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1162         case AF_INET6:
1163                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1164                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1165                 break;
1166 #endif
1167         }
1168         if (xdaddr)
1169                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1170
1171         if (x == NULL)
1172                 return -ENOENT;
1173
1174         resp_skb = ERR_PTR(-ENOENT);
1175
1176         spin_lock_bh(&x->lock);
1177         if (x->km.state != XFRM_STATE_DEAD) {
1178                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1179                 u32 min_spi, max_spi;
1180
1181                 if (range != NULL) {
1182                         min_spi = range->sadb_spirange_min;
1183                         max_spi = range->sadb_spirange_max;
1184                 } else {
1185                         min_spi = 0x100;
1186                         max_spi = 0x0fffffff;
1187                 }
1188                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1189                 if (x->id.spi)
1190                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1191         }
1192         spin_unlock_bh(&x->lock);
1193
1194         if (IS_ERR(resp_skb)) {
1195                 xfrm_state_put(x);
1196                 return  PTR_ERR(resp_skb);
1197         }
1198
1199         out_hdr = (struct sadb_msg *) resp_skb->data;
1200         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1201         out_hdr->sadb_msg_type = SADB_GETSPI;
1202         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1203         out_hdr->sadb_msg_errno = 0;
1204         out_hdr->sadb_msg_reserved = 0;
1205         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1206         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1207
1208         xfrm_state_put(x);
1209
1210         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1211
1212         return 0;
1213 }
1214
1215 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1216 {
1217         struct xfrm_state *x;
1218
1219         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1220                 return -EOPNOTSUPP;
1221
1222         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1223                 return 0;
1224
1225         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1226         if (x == NULL)
1227                 return 0;
1228
1229         spin_lock_bh(&x->lock);
1230         if (x->km.state == XFRM_STATE_ACQ) {
1231                 x->km.state = XFRM_STATE_ERROR;
1232                 wake_up(&km_waitq);
1233         }
1234         spin_unlock_bh(&x->lock);
1235         xfrm_state_put(x);
1236         return 0;
1237 }
1238
1239
1240 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1241 {
1242         struct sk_buff *out_skb;
1243         struct sadb_msg *out_hdr;
1244         struct xfrm_state *x;
1245         int err;
1246
1247         xfrm_probe_algs();
1248
1249         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1250         if (IS_ERR(x))
1251                 return PTR_ERR(x);
1252
1253         if (hdr->sadb_msg_type == SADB_ADD)
1254                 err = xfrm_state_add(x);
1255         else
1256                 err = xfrm_state_update(x);
1257
1258         if (err < 0) {
1259                 x->km.state = XFRM_STATE_DEAD;
1260                 xfrm_state_put(x);
1261                 return err;
1262         }
1263
1264         out_skb = pfkey_xfrm_state2msg(x, 0, 3);
1265         if (IS_ERR(out_skb))
1266                 return  PTR_ERR(out_skb); /* XXX Should we return 0 here ? */
1267
1268         out_hdr = (struct sadb_msg *) out_skb->data;
1269         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1270         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1271         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1272         out_hdr->sadb_msg_errno = 0;
1273         out_hdr->sadb_msg_reserved = 0;
1274         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1275         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1276
1277         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1278
1279         return 0;
1280 }
1281
1282 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1283 {
1284         struct xfrm_state *x;
1285
1286         if (!ext_hdrs[SADB_EXT_SA-1] ||
1287             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1288                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1289                 return -EINVAL;
1290
1291         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1292         if (x == NULL)
1293                 return -ESRCH;
1294
1295         if (xfrm_state_kern(x)) {
1296                 xfrm_state_put(x);
1297                 return -EPERM;
1298         }
1299
1300         xfrm_state_delete(x);
1301         xfrm_state_put(x);
1302
1303         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
1304                         BROADCAST_ALL, sk);
1305
1306         return 0;
1307 }
1308
1309 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1310 {
1311         __u8 proto;
1312         struct sk_buff *out_skb;
1313         struct sadb_msg *out_hdr;
1314         struct xfrm_state *x;
1315
1316         if (!ext_hdrs[SADB_EXT_SA-1] ||
1317             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1318                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1319                 return -EINVAL;
1320
1321         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1322         if (x == NULL)
1323                 return -ESRCH;
1324
1325         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1326         proto = x->id.proto;
1327         xfrm_state_put(x);
1328         if (IS_ERR(out_skb))
1329                 return  PTR_ERR(out_skb);
1330
1331         out_hdr = (struct sadb_msg *) out_skb->data;
1332         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1333         out_hdr->sadb_msg_type = SADB_DUMP;
1334         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1335         out_hdr->sadb_msg_errno = 0;
1336         out_hdr->sadb_msg_reserved = 0;
1337         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1338         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1339         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1340
1341         return 0;
1342 }
1343
1344 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1345 {
1346         struct sk_buff *skb;
1347         struct sadb_msg *hdr;
1348         int len, auth_len, enc_len, i;
1349
1350         auth_len = xfrm_count_auth_supported();
1351         if (auth_len) {
1352                 auth_len *= sizeof(struct sadb_alg);
1353                 auth_len += sizeof(struct sadb_supported);
1354         }
1355
1356         enc_len = xfrm_count_enc_supported();
1357         if (enc_len) {
1358                 enc_len *= sizeof(struct sadb_alg);
1359                 enc_len += sizeof(struct sadb_supported);
1360         }
1361
1362         len = enc_len + auth_len + sizeof(struct sadb_msg);
1363
1364         skb = alloc_skb(len + 16, allocation);
1365         if (!skb)
1366                 goto out_put_algs;
1367
1368         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1369         pfkey_hdr_dup(hdr, orig);
1370         hdr->sadb_msg_errno = 0;
1371         hdr->sadb_msg_len = len / sizeof(uint64_t);
1372
1373         if (auth_len) {
1374                 struct sadb_supported *sp;
1375                 struct sadb_alg *ap;
1376
1377                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1378                 ap = (struct sadb_alg *) (sp + 1);
1379
1380                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1381                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1382
1383                 for (i = 0; ; i++) {
1384                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1385                         if (!aalg)
1386                                 break;
1387                         if (aalg->available)
1388                                 *ap++ = aalg->desc;
1389                 }
1390         }
1391
1392         if (enc_len) {
1393                 struct sadb_supported *sp;
1394                 struct sadb_alg *ap;
1395
1396                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1397                 ap = (struct sadb_alg *) (sp + 1);
1398
1399                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1400                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1401
1402                 for (i = 0; ; i++) {
1403                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1404                         if (!ealg)
1405                                 break;
1406                         if (ealg->available)
1407                                 *ap++ = ealg->desc;
1408                 }
1409         }
1410
1411 out_put_algs:
1412         return skb;
1413 }
1414
1415 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1416 {
1417         struct pfkey_opt *pfk = pfkey_sk(sk);
1418         struct sk_buff *supp_skb;
1419
1420         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1421                 return -EINVAL;
1422
1423         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1424                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1425                         return -EEXIST;
1426                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1427         }
1428
1429         xfrm_probe_algs();
1430
1431         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1432         if (!supp_skb) {
1433                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1434                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1435
1436                 return -ENOBUFS;
1437         }
1438
1439         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1440
1441         return 0;
1442 }
1443
1444 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1445 {
1446         unsigned proto;
1447         struct sk_buff *skb_out;
1448         struct sadb_msg *hdr_out;
1449
1450         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1451         if (proto == 0)
1452                 return -EINVAL;
1453
1454         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
1455         if (!skb_out)
1456                 return -ENOBUFS;
1457
1458         xfrm_state_flush(proto);
1459
1460         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
1461         pfkey_hdr_dup(hdr_out, hdr);
1462         hdr_out->sadb_msg_errno = (uint8_t) 0;
1463         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1464
1465         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
1466
1467         return 0;
1468 }
1469
1470 struct pfkey_dump_data
1471 {
1472         struct sk_buff *skb;
1473         struct sadb_msg *hdr;
1474         struct sock *sk;
1475 };
1476
1477 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1478 {
1479         struct pfkey_dump_data *data = ptr;
1480         struct sk_buff *out_skb;
1481         struct sadb_msg *out_hdr;
1482
1483         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1484         if (IS_ERR(out_skb))
1485                 return PTR_ERR(out_skb);
1486
1487         out_hdr = (struct sadb_msg *) out_skb->data;
1488         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1489         out_hdr->sadb_msg_type = SADB_DUMP;
1490         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1491         out_hdr->sadb_msg_errno = 0;
1492         out_hdr->sadb_msg_reserved = 0;
1493         out_hdr->sadb_msg_seq = count;
1494         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1495         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1496         return 0;
1497 }
1498
1499 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1500 {
1501         u8 proto;
1502         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1503
1504         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1505         if (proto == 0)
1506                 return -EINVAL;
1507
1508         return xfrm_state_walk(proto, dump_sa, &data);
1509 }
1510
1511 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1512 {
1513         struct pfkey_opt *pfk = pfkey_sk(sk);
1514         int satype = hdr->sadb_msg_satype;
1515
1516         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1517                 /* XXX we mangle packet... */
1518                 hdr->sadb_msg_errno = 0;
1519                 if (satype != 0 && satype != 1)
1520                         return -EINVAL;
1521                 pfk->promisc = satype;
1522         }
1523         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1524         return 0;
1525 }
1526
1527 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1528 {
1529         int i;
1530         u32 reqid = *(u32*)ptr;
1531
1532         for (i=0; i<xp->xfrm_nr; i++) {
1533                 if (xp->xfrm_vec[i].reqid == reqid)
1534                         return -EEXIST;
1535         }
1536         return 0;
1537 }
1538
1539 static u32 gen_reqid(void)
1540 {
1541         u32 start;
1542         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1543
1544         start = reqid;
1545         do {
1546                 ++reqid;
1547                 if (reqid == 0)
1548                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1549                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1550                         return reqid;
1551         } while (reqid != start);
1552         return 0;
1553 }
1554
1555 static int
1556 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1557 {
1558         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1559         struct sockaddr_in *sin;
1560 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1561         struct sockaddr_in6 *sin6;
1562 #endif
1563
1564         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1565                 return -ELOOP;
1566
1567         if (rq->sadb_x_ipsecrequest_mode == 0)
1568                 return -EINVAL;
1569
1570         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1571         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1572         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1573                 t->optional = 1;
1574         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1575                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1576                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1577                         t->reqid = 0;
1578                 if (!t->reqid && !(t->reqid = gen_reqid()))
1579                         return -ENOBUFS;
1580         }
1581
1582         /* addresses present only in tunnel mode */
1583         if (t->mode) {
1584                 switch (xp->family) {
1585                 case AF_INET:
1586                         sin = (void*)(rq+1);
1587                         if (sin->sin_family != AF_INET)
1588                                 return -EINVAL;
1589                         t->saddr.a4 = sin->sin_addr.s_addr;
1590                         sin++;
1591                         if (sin->sin_family != AF_INET)
1592                                 return -EINVAL;
1593                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1594                         break;
1595 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1596                 case AF_INET6:
1597                         sin6 = (void *)(rq+1);
1598                         if (sin6->sin6_family != AF_INET6)
1599                                 return -EINVAL;
1600                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1601                         sin6++;
1602                         if (sin6->sin6_family != AF_INET6)
1603                                 return -EINVAL;
1604                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1605                         break;
1606 #endif
1607                 default:
1608                         return -EINVAL;
1609                 }
1610         }
1611         /* No way to set this via kame pfkey */
1612         t->aalgos = t->ealgos = t->calgos = ~0;
1613         xp->xfrm_nr++;
1614         return 0;
1615 }
1616
1617 static int
1618 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1619 {
1620         int err;
1621         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1622         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1623
1624         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1625                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1626                         return err;
1627                 len -= rq->sadb_x_ipsecrequest_len;
1628                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1629         }
1630         return 0;
1631 }
1632
1633 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1634 {
1635         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1636         int socklen = (xp->family == AF_INET ?
1637                        sizeof(struct sockaddr_in) :
1638                        sizeof(struct sockaddr_in6));
1639
1640         return sizeof(struct sadb_msg) +
1641                 (sizeof(struct sadb_lifetime) * 3) +
1642                 (sizeof(struct sadb_address) * 2) +
1643                 (sockaddr_size * 2) +
1644                 sizeof(struct sadb_x_policy) +
1645                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1646                                 (socklen * 2)));
1647 }
1648
1649 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1650 {
1651         struct sk_buff *skb;
1652         int size;
1653
1654         size = pfkey_xfrm_policy2msg_size(xp);
1655
1656         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1657         if (skb == NULL)
1658                 return ERR_PTR(-ENOBUFS);
1659
1660         return skb;
1661 }
1662
1663 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1664 {
1665         struct sadb_msg *hdr;
1666         struct sadb_address *addr;
1667         struct sadb_lifetime *lifetime;
1668         struct sadb_x_policy *pol;
1669         struct sockaddr_in   *sin;
1670 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1671         struct sockaddr_in6  *sin6;
1672 #endif
1673         int i;
1674         int size;
1675         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1676         int socklen = (xp->family == AF_INET ?
1677                        sizeof(struct sockaddr_in) :
1678                        sizeof(struct sockaddr_in6));
1679
1680         size = pfkey_xfrm_policy2msg_size(xp);
1681
1682         /* call should fill header later */
1683         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1684         memset(hdr, 0, size);   /* XXX do we need this ? */
1685
1686         /* src address */
1687         addr = (struct sadb_address*) skb_put(skb,
1688                                               sizeof(struct sadb_address)+sockaddr_size);
1689         addr->sadb_address_len =
1690                 (sizeof(struct sadb_address)+sockaddr_size)/
1691                         sizeof(uint64_t);
1692         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1693         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1694         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1695         addr->sadb_address_reserved = 0;
1696         /* src address */
1697         if (xp->family == AF_INET) {
1698                 sin = (struct sockaddr_in *) (addr + 1);
1699                 sin->sin_family = AF_INET;
1700                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1701                 sin->sin_port = xp->selector.sport;
1702                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1703         }
1704 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1705         else if (xp->family == AF_INET6) {
1706                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1707                 sin6->sin6_family = AF_INET6;
1708                 sin6->sin6_port = xp->selector.sport;
1709                 sin6->sin6_flowinfo = 0;
1710                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1711                        sizeof(struct in6_addr));
1712                 sin6->sin6_scope_id = 0;
1713         }
1714 #endif
1715         else
1716                 BUG();
1717
1718         /* dst address */
1719         addr = (struct sadb_address*) skb_put(skb,
1720                                               sizeof(struct sadb_address)+sockaddr_size);
1721         addr->sadb_address_len =
1722                 (sizeof(struct sadb_address)+sockaddr_size)/
1723                         sizeof(uint64_t);
1724         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1725         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1726         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1727         addr->sadb_address_reserved = 0;
1728         if (xp->family == AF_INET) {
1729                 sin = (struct sockaddr_in *) (addr + 1);
1730                 sin->sin_family = AF_INET;
1731                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1732                 sin->sin_port = xp->selector.dport;
1733                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1734         }
1735 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1736         else if (xp->family == AF_INET6) {
1737                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1738                 sin6->sin6_family = AF_INET6;
1739                 sin6->sin6_port = xp->selector.dport;
1740                 sin6->sin6_flowinfo = 0;
1741                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1742                        sizeof(struct in6_addr));
1743                 sin6->sin6_scope_id = 0;
1744         }
1745 #endif
1746         else
1747                 BUG();
1748
1749         /* hard time */
1750         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1751                                                      sizeof(struct sadb_lifetime));
1752         lifetime->sadb_lifetime_len =
1753                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1754         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1755         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1756         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1757         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1758         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1759         /* soft time */
1760         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1761                                                      sizeof(struct sadb_lifetime));
1762         lifetime->sadb_lifetime_len =
1763                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1764         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1765         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1766         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1767         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1768         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1769         /* current time */
1770         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1771                                                      sizeof(struct sadb_lifetime));
1772         lifetime->sadb_lifetime_len =
1773                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1774         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1775         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1776         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1777         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1778         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1779
1780         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1781         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1782         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1783         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1784         if (xp->action == XFRM_POLICY_ALLOW) {
1785                 if (xp->xfrm_nr)
1786                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1787                 else
1788                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1789         }
1790         pol->sadb_x_policy_dir = dir+1;
1791         pol->sadb_x_policy_id = xp->index;
1792         pol->sadb_x_policy_priority = xp->priority;
1793
1794         for (i=0; i<xp->xfrm_nr; i++) {
1795                 struct sadb_x_ipsecrequest *rq;
1796                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1797                 int req_size;
1798
1799                 req_size = sizeof(struct sadb_x_ipsecrequest);
1800                 if (t->mode)
1801                         req_size += 2*socklen;
1802                 else
1803                         size -= 2*socklen;
1804                 rq = (void*)skb_put(skb, req_size);
1805                 pol->sadb_x_policy_len += req_size/8;
1806                 memset(rq, 0, sizeof(*rq));
1807                 rq->sadb_x_ipsecrequest_len = req_size;
1808                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1809                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1810                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1811                 if (t->reqid)
1812                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1813                 if (t->optional)
1814                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1815                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1816                 if (t->mode) {
1817                         switch (xp->family) {
1818                         case AF_INET:
1819                                 sin = (void*)(rq+1);
1820                                 sin->sin_family = AF_INET;
1821                                 sin->sin_addr.s_addr = t->saddr.a4;
1822                                 sin->sin_port = 0;
1823                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1824                                 sin++;
1825                                 sin->sin_family = AF_INET;
1826                                 sin->sin_addr.s_addr = t->id.daddr.a4;
1827                                 sin->sin_port = 0;
1828                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1829                                 break;
1830 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1831                         case AF_INET6:
1832                                 sin6 = (void*)(rq+1);
1833                                 sin6->sin6_family = AF_INET6;
1834                                 sin6->sin6_port = 0;
1835                                 sin6->sin6_flowinfo = 0;
1836                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
1837                                        sizeof(struct in6_addr));
1838                                 sin6->sin6_scope_id = 0;
1839
1840                                 sin6++;
1841                                 sin6->sin6_family = AF_INET6;
1842                                 sin6->sin6_port = 0;
1843                                 sin6->sin6_flowinfo = 0;
1844                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1845                                        sizeof(struct in6_addr));
1846                                 sin6->sin6_scope_id = 0;
1847                                 break;
1848 #endif
1849                         default:
1850                                 break;
1851                         }
1852                 }
1853         }
1854         hdr->sadb_msg_len = size / sizeof(uint64_t);
1855         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1856 }
1857
1858 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1859 {
1860         int err;
1861         struct sadb_lifetime *lifetime;
1862         struct sadb_address *sa;
1863         struct sadb_x_policy *pol;
1864         struct xfrm_policy *xp;
1865         struct sk_buff *out_skb;
1866         struct sadb_msg *out_hdr;
1867
1868         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1869                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1870             !ext_hdrs[SADB_X_EXT_POLICY-1])
1871                 return -EINVAL;
1872
1873         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1874         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1875                 return -EINVAL;
1876         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1877                 return -EINVAL;
1878
1879         xp = xfrm_policy_alloc(GFP_KERNEL);
1880         if (xp == NULL)
1881                 return -ENOBUFS;
1882
1883         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
1884                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
1885         xp->priority = pol->sadb_x_policy_priority;
1886
1887         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1888         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
1889         if (!xp->family) {
1890                 err = -EINVAL;
1891                 goto out;
1892         }
1893         xp->selector.family = xp->family;
1894         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
1895         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1896         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1897         if (xp->selector.sport)
1898                 xp->selector.sport_mask = ~0;
1899
1900         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1901         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
1902         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
1903
1904         /* Amusing, we set this twice.  KAME apps appear to set same value
1905          * in both addresses.
1906          */
1907         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1908
1909         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
1910         if (xp->selector.dport)
1911                 xp->selector.dport_mask = ~0;
1912
1913         xp->lft.soft_byte_limit = XFRM_INF;
1914         xp->lft.hard_byte_limit = XFRM_INF;
1915         xp->lft.soft_packet_limit = XFRM_INF;
1916         xp->lft.hard_packet_limit = XFRM_INF;
1917         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
1918                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1919                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1920                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1921                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1922         }
1923         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
1924                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1925                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1926                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1927                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1928         }
1929         xp->xfrm_nr = 0;
1930         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
1931             (err = parse_ipsecrequests(xp, pol)) < 0)
1932                 goto out;
1933
1934         out_skb = pfkey_xfrm_policy2msg_prep(xp);
1935         if (IS_ERR(out_skb)) {
1936                 err =  PTR_ERR(out_skb);
1937                 goto out;
1938         }
1939
1940         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
1941                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
1942         if (err) {
1943                 kfree_skb(out_skb);
1944                 goto out;
1945         }
1946
1947         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
1948
1949         xfrm_pol_put(xp);
1950
1951         out_hdr = (struct sadb_msg *) out_skb->data;
1952         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1953         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1954         out_hdr->sadb_msg_satype = 0;
1955         out_hdr->sadb_msg_errno = 0;
1956         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1957         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1958         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1959         return 0;
1960
1961 out:
1962         kfree(xp);
1963         return err;
1964 }
1965
1966 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1967 {
1968         int err;
1969         struct sadb_address *sa;
1970         struct sadb_x_policy *pol;
1971         struct xfrm_policy *xp;
1972         struct sk_buff *out_skb;
1973         struct sadb_msg *out_hdr;
1974         struct xfrm_selector sel;
1975
1976         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1977                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1978             !ext_hdrs[SADB_X_EXT_POLICY-1])
1979                 return -EINVAL;
1980
1981         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1982         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1983                 return -EINVAL;
1984
1985         memset(&sel, 0, sizeof(sel));
1986
1987         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1988         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
1989         sel.prefixlen_s = sa->sadb_address_prefixlen;
1990         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1991         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1992         if (sel.sport)
1993                 sel.sport_mask = ~0;
1994
1995         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1996         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
1997         sel.prefixlen_d = sa->sadb_address_prefixlen;
1998         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1999         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2000         if (sel.dport)
2001                 sel.dport_mask = ~0;
2002
2003         xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2004         if (xp == NULL)
2005                 return -ENOENT;
2006
2007         err = 0;
2008
2009         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2010         if (IS_ERR(out_skb)) {
2011                 err =  PTR_ERR(out_skb);
2012                 goto out;
2013         }
2014         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2015
2016         out_hdr = (struct sadb_msg *) out_skb->data;
2017         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2018         out_hdr->sadb_msg_type = SADB_X_SPDDELETE;
2019         out_hdr->sadb_msg_satype = 0;
2020         out_hdr->sadb_msg_errno = 0;
2021         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2022         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2023         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2024         err = 0;
2025
2026 out:
2027         xfrm_pol_put(xp);
2028         return err;
2029 }
2030
2031 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2032 {
2033         int err;
2034         struct sadb_x_policy *pol;
2035         struct xfrm_policy *xp;
2036         struct sk_buff *out_skb;
2037         struct sadb_msg *out_hdr;
2038
2039         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2040                 return -EINVAL;
2041
2042         xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2043                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2044         if (xp == NULL)
2045                 return -ENOENT;
2046
2047         err = 0;
2048
2049         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2050         if (IS_ERR(out_skb)) {
2051                 err =  PTR_ERR(out_skb);
2052                 goto out;
2053         }
2054         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2055
2056         out_hdr = (struct sadb_msg *) out_skb->data;
2057         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2058         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2059         out_hdr->sadb_msg_satype = 0;
2060         out_hdr->sadb_msg_errno = 0;
2061         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2062         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2063         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2064         err = 0;
2065
2066 out:
2067         xfrm_pol_put(xp);
2068         return err;
2069 }
2070
2071 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2072 {
2073         struct pfkey_dump_data *data = ptr;
2074         struct sk_buff *out_skb;
2075         struct sadb_msg *out_hdr;
2076
2077         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2078         if (IS_ERR(out_skb))
2079                 return PTR_ERR(out_skb);
2080
2081         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2082
2083         out_hdr = (struct sadb_msg *) out_skb->data;
2084         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2085         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2086         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2087         out_hdr->sadb_msg_errno = 0;
2088         out_hdr->sadb_msg_seq = count;
2089         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2090         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2091         return 0;
2092 }
2093
2094 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2095 {
2096         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2097
2098         return xfrm_policy_walk(dump_sp, &data);
2099 }
2100
2101 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2102 {
2103         struct sk_buff *skb_out;
2104         struct sadb_msg *hdr_out;
2105
2106         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
2107         if (!skb_out)
2108                 return -ENOBUFS;
2109
2110         xfrm_policy_flush();
2111
2112         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2113         pfkey_hdr_dup(hdr_out, hdr);
2114         hdr_out->sadb_msg_errno = (uint8_t) 0;
2115         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2116         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
2117
2118         return 0;
2119 }
2120
2121 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2122                              struct sadb_msg *hdr, void **ext_hdrs);
2123 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2124         [SADB_RESERVED]         = pfkey_reserved,
2125         [SADB_GETSPI]           = pfkey_getspi,
2126         [SADB_UPDATE]           = pfkey_add,
2127         [SADB_ADD]              = pfkey_add,
2128         [SADB_DELETE]           = pfkey_delete,
2129         [SADB_GET]              = pfkey_get,
2130         [SADB_ACQUIRE]          = pfkey_acquire,
2131         [SADB_REGISTER]         = pfkey_register,
2132         [SADB_EXPIRE]           = NULL,
2133         [SADB_FLUSH]            = pfkey_flush,
2134         [SADB_DUMP]             = pfkey_dump,
2135         [SADB_X_PROMISC]        = pfkey_promisc,
2136         [SADB_X_PCHANGE]        = NULL,
2137         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2138         [SADB_X_SPDADD]         = pfkey_spdadd,
2139         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2140         [SADB_X_SPDGET]         = pfkey_spdget,
2141         [SADB_X_SPDACQUIRE]     = NULL,
2142         [SADB_X_SPDDUMP]        = pfkey_spddump,
2143         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2144         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2145         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2146 };
2147
2148 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2149 {
2150         void *ext_hdrs[SADB_EXT_MAX];
2151         int err;
2152
2153         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2154                         BROADCAST_PROMISC_ONLY, NULL);
2155
2156         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2157         err = parse_exthdrs(skb, hdr, ext_hdrs);
2158         if (!err) {
2159                 err = -EOPNOTSUPP;
2160                 if (pfkey_funcs[hdr->sadb_msg_type])
2161                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2162         }
2163         return err;
2164 }
2165
2166 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2167 {
2168         struct sadb_msg *hdr = NULL;
2169
2170         if (skb->len < sizeof(*hdr)) {
2171                 *errp = -EMSGSIZE;
2172         } else {
2173                 hdr = (struct sadb_msg *) skb->data;
2174                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2175                     hdr->sadb_msg_reserved != 0 ||
2176                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2177                      hdr->sadb_msg_type > SADB_MAX)) {
2178                         hdr = NULL;
2179                         *errp = -EINVAL;
2180                 } else if (hdr->sadb_msg_len != (skb->len /
2181                                                  sizeof(uint64_t)) ||
2182                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2183                                                 sizeof(uint64_t))) {
2184                         hdr = NULL;
2185                         *errp = -EMSGSIZE;
2186                 } else {
2187                         *errp = 0;
2188                 }
2189         }
2190         return hdr;
2191 }
2192
2193 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2194 {
2195         return t->aalgos & (1 << d->desc.sadb_alg_id);
2196 }
2197
2198 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2199 {
2200         return t->ealgos & (1 << d->desc.sadb_alg_id);
2201 }
2202
2203 static int count_ah_combs(struct xfrm_tmpl *t)
2204 {
2205         int i, sz = 0;
2206
2207         for (i = 0; ; i++) {
2208                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2209                 if (!aalg)
2210                         break;
2211                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2212                         sz += sizeof(struct sadb_comb);
2213         }
2214         return sz + sizeof(struct sadb_prop);
2215 }
2216
2217 static int count_esp_combs(struct xfrm_tmpl *t)
2218 {
2219         int i, k, sz = 0;
2220
2221         for (i = 0; ; i++) {
2222                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2223                 if (!ealg)
2224                         break;
2225
2226                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2227                         continue;
2228
2229                 for (k = 1; ; k++) {
2230                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2231                         if (!aalg)
2232                                 break;
2233
2234                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2235                                 sz += sizeof(struct sadb_comb);
2236                 }
2237         }
2238         return sz + sizeof(struct sadb_prop);
2239 }
2240
2241 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2242 {
2243         struct sadb_prop *p;
2244         int i;
2245
2246         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2247         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2248         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2249         p->sadb_prop_replay = 32;
2250         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2251
2252         for (i = 0; ; i++) {
2253                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2254                 if (!aalg)
2255                         break;
2256
2257                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2258                         struct sadb_comb *c;
2259                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2260                         memset(c, 0, sizeof(*c));
2261                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2262                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2263                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2264                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2265                         c->sadb_comb_hard_addtime = 24*60*60;
2266                         c->sadb_comb_soft_addtime = 20*60*60;
2267                         c->sadb_comb_hard_usetime = 8*60*60;
2268                         c->sadb_comb_soft_usetime = 7*60*60;
2269                 }
2270         }
2271 }
2272
2273 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2274 {
2275         struct sadb_prop *p;
2276         int i, k;
2277
2278         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2279         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2280         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2281         p->sadb_prop_replay = 32;
2282         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2283
2284         for (i=0; ; i++) {
2285                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2286                 if (!ealg)
2287                         break;
2288
2289                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2290                         continue;
2291
2292                 for (k = 1; ; k++) {
2293                         struct sadb_comb *c;
2294                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2295                         if (!aalg)
2296                                 break;
2297                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2298                                 continue;
2299                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2300                         memset(c, 0, sizeof(*c));
2301                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2302                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2303                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2304                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2305                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2306                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2307                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2308                         c->sadb_comb_hard_addtime = 24*60*60;
2309                         c->sadb_comb_soft_addtime = 20*60*60;
2310                         c->sadb_comb_hard_usetime = 8*60*60;
2311                         c->sadb_comb_soft_usetime = 7*60*60;
2312                 }
2313         }
2314 }
2315
2316 static int pfkey_send_notify(struct xfrm_state *x, int hard)
2317 {
2318         struct sk_buff *out_skb;
2319         struct sadb_msg *out_hdr;
2320         int hsc = (hard ? 2 : 1);
2321
2322         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2323         if (IS_ERR(out_skb))
2324                 return PTR_ERR(out_skb);
2325
2326         out_hdr = (struct sadb_msg *) out_skb->data;
2327         out_hdr->sadb_msg_version = PF_KEY_V2;
2328         out_hdr->sadb_msg_type = SADB_EXPIRE;
2329         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2330         out_hdr->sadb_msg_errno = 0;
2331         out_hdr->sadb_msg_reserved = 0;
2332         out_hdr->sadb_msg_seq = 0;
2333         out_hdr->sadb_msg_pid = 0;
2334
2335         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2336         return 0;
2337 }
2338
2339 static u32 get_acqseq(void)
2340 {
2341         u32 res;
2342         static u32 acqseq;
2343         static spinlock_t acqseq_lock = SPIN_LOCK_UNLOCKED;
2344
2345         spin_lock_bh(&acqseq_lock);
2346         res = (++acqseq ? : ++acqseq);
2347         spin_unlock_bh(&acqseq_lock);
2348         return res;
2349 }
2350
2351 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2352 {
2353         struct sk_buff *skb;
2354         struct sadb_msg *hdr;
2355         struct sadb_address *addr;
2356         struct sadb_x_policy *pol;
2357         struct sockaddr_in *sin;
2358 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2359         struct sockaddr_in6 *sin6;
2360 #endif
2361         int sockaddr_size;
2362         int size;
2363
2364         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2365         if (!sockaddr_size)
2366                 return -EINVAL;
2367
2368         size = sizeof(struct sadb_msg) +
2369                 (sizeof(struct sadb_address) * 2) +
2370                 (sockaddr_size * 2) +
2371                 sizeof(struct sadb_x_policy);
2372
2373         if (x->id.proto == IPPROTO_AH)
2374                 size += count_ah_combs(t);
2375         else if (x->id.proto == IPPROTO_ESP)
2376                 size += count_esp_combs(t);
2377
2378         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2379         if (skb == NULL)
2380                 return -ENOMEM;
2381
2382         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2383         hdr->sadb_msg_version = PF_KEY_V2;
2384         hdr->sadb_msg_type = SADB_ACQUIRE;
2385         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2386         hdr->sadb_msg_len = size / sizeof(uint64_t);
2387         hdr->sadb_msg_errno = 0;
2388         hdr->sadb_msg_reserved = 0;
2389         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2390         hdr->sadb_msg_pid = 0;
2391
2392         /* src address */
2393         addr = (struct sadb_address*) skb_put(skb,
2394                                               sizeof(struct sadb_address)+sockaddr_size);
2395         addr->sadb_address_len =
2396                 (sizeof(struct sadb_address)+sockaddr_size)/
2397                         sizeof(uint64_t);
2398         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2399         addr->sadb_address_proto = 0;
2400         addr->sadb_address_reserved = 0;
2401         if (x->props.family == AF_INET) {
2402                 addr->sadb_address_prefixlen = 32;
2403
2404                 sin = (struct sockaddr_in *) (addr + 1);
2405                 sin->sin_family = AF_INET;
2406                 sin->sin_addr.s_addr = x->props.saddr.a4;
2407                 sin->sin_port = 0;
2408                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2409         }
2410 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2411         else if (x->props.family == AF_INET6) {
2412                 addr->sadb_address_prefixlen = 128;
2413
2414                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2415                 sin6->sin6_family = AF_INET6;
2416                 sin6->sin6_port = 0;
2417                 sin6->sin6_flowinfo = 0;
2418                 memcpy(&sin6->sin6_addr,
2419                        x->props.saddr.a6, sizeof(struct in6_addr));
2420                 sin6->sin6_scope_id = 0;
2421         }
2422 #endif
2423         else
2424                 BUG();
2425
2426         /* dst address */
2427         addr = (struct sadb_address*) skb_put(skb,
2428                                               sizeof(struct sadb_address)+sockaddr_size);
2429         addr->sadb_address_len =
2430                 (sizeof(struct sadb_address)+sockaddr_size)/
2431                         sizeof(uint64_t);
2432         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2433         addr->sadb_address_proto = 0;
2434         addr->sadb_address_reserved = 0;
2435         if (x->props.family == AF_INET) {
2436                 addr->sadb_address_prefixlen = 32;
2437
2438                 sin = (struct sockaddr_in *) (addr + 1);
2439                 sin->sin_family = AF_INET;
2440                 sin->sin_addr.s_addr = x->id.daddr.a4;
2441                 sin->sin_port = 0;
2442                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2443         }
2444 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2445         else if (x->props.family == AF_INET6) {
2446                 addr->sadb_address_prefixlen = 128;
2447
2448                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2449                 sin6->sin6_family = AF_INET6;
2450                 sin6->sin6_port = 0;
2451                 sin6->sin6_flowinfo = 0;
2452                 memcpy(&sin6->sin6_addr,
2453                        x->id.daddr.a6, sizeof(struct in6_addr));
2454                 sin6->sin6_scope_id = 0;
2455         }
2456 #endif
2457         else
2458                 BUG();
2459
2460         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2461         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2462         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2463         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2464         pol->sadb_x_policy_dir = dir+1;
2465         pol->sadb_x_policy_id = xp->index;
2466
2467         /* Set sadb_comb's. */
2468         if (x->id.proto == IPPROTO_AH)
2469                 dump_ah_combs(skb, t);
2470         else if (x->id.proto == IPPROTO_ESP)
2471                 dump_esp_combs(skb, t);
2472
2473         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2474 }
2475
2476 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2477                                                 u8 *data, int len, int *dir)
2478 {
2479         struct xfrm_policy *xp;
2480         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2481
2482         switch (family) {
2483         case AF_INET:
2484                 if (opt != IP_IPSEC_POLICY) {
2485                         *dir = -EOPNOTSUPP;
2486                         return NULL;
2487                 }
2488                 break;
2489 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2490         case AF_INET6:
2491                 if (opt != IPV6_IPSEC_POLICY) {
2492                         *dir = -EOPNOTSUPP;
2493                         return NULL;
2494                 }
2495                 break;
2496 #endif
2497         default:
2498                 *dir = -EINVAL;
2499                 return NULL;
2500         }
2501
2502         *dir = -EINVAL;
2503
2504         if (len < sizeof(struct sadb_x_policy) ||
2505             pol->sadb_x_policy_len*8 > len ||
2506             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2507             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2508                 return NULL;
2509
2510         xp = xfrm_policy_alloc(GFP_ATOMIC);
2511         if (xp == NULL) {
2512                 *dir = -ENOBUFS;
2513                 return NULL;
2514         }
2515
2516         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2517                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2518
2519         xp->lft.soft_byte_limit = XFRM_INF;
2520         xp->lft.hard_byte_limit = XFRM_INF;
2521         xp->lft.soft_packet_limit = XFRM_INF;
2522         xp->lft.hard_packet_limit = XFRM_INF;
2523         xp->family = family;
2524
2525         xp->xfrm_nr = 0;
2526         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2527             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2528                 goto out;
2529
2530         *dir = pol->sadb_x_policy_dir-1;
2531         return xp;
2532
2533 out:
2534         kfree(xp);
2535         return NULL;
2536 }
2537
2538 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2539 {
2540         struct sk_buff *skb;
2541         struct sadb_msg *hdr;
2542         struct sadb_sa *sa;
2543         struct sadb_address *addr;
2544         struct sadb_x_nat_t_port *n_port;
2545         struct sockaddr_in *sin;
2546 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2547         struct sockaddr_in6 *sin6;
2548 #endif
2549         int sockaddr_size;
2550         int size;
2551         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2552         struct xfrm_encap_tmpl *natt = NULL;
2553
2554         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2555         if (!sockaddr_size)
2556                 return -EINVAL;
2557
2558         if (!satype)
2559                 return -EINVAL;
2560
2561         if (!x->encap)
2562                 return -EINVAL;
2563
2564         natt = x->encap;
2565
2566         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2567          *
2568          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2569          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2570          */
2571
2572         size = sizeof(struct sadb_msg) +
2573                 sizeof(struct sadb_sa) +
2574                 (sizeof(struct sadb_address) * 2) +
2575                 (sockaddr_size * 2) +
2576                 (sizeof(struct sadb_x_nat_t_port) * 2);
2577
2578         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2579         if (skb == NULL)
2580                 return -ENOMEM;
2581
2582         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2583         hdr->sadb_msg_version = PF_KEY_V2;
2584         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2585         hdr->sadb_msg_satype = satype;
2586         hdr->sadb_msg_len = size / sizeof(uint64_t);
2587         hdr->sadb_msg_errno = 0;
2588         hdr->sadb_msg_reserved = 0;
2589         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2590         hdr->sadb_msg_pid = 0;
2591
2592         /* SA */
2593         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2594         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2595         sa->sadb_sa_exttype = SADB_EXT_SA;
2596         sa->sadb_sa_spi = x->id.spi;
2597         sa->sadb_sa_replay = 0;
2598         sa->sadb_sa_state = 0;
2599         sa->sadb_sa_auth = 0;
2600         sa->sadb_sa_encrypt = 0;
2601         sa->sadb_sa_flags = 0;
2602
2603         /* ADDRESS_SRC (old addr) */
2604         addr = (struct sadb_address*)
2605                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2606         addr->sadb_address_len =
2607                 (sizeof(struct sadb_address)+sockaddr_size)/
2608                         sizeof(uint64_t);
2609         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2610         addr->sadb_address_proto = 0;
2611         addr->sadb_address_reserved = 0;
2612         if (x->props.family == AF_INET) {
2613                 addr->sadb_address_prefixlen = 32;
2614
2615                 sin = (struct sockaddr_in *) (addr + 1);
2616                 sin->sin_family = AF_INET;
2617                 sin->sin_addr.s_addr = x->props.saddr.a4;
2618                 sin->sin_port = 0;
2619                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2620         }
2621 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2622         else if (x->props.family == AF_INET6) {
2623                 addr->sadb_address_prefixlen = 128;
2624
2625                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2626                 sin6->sin6_family = AF_INET6;
2627                 sin6->sin6_port = 0;
2628                 sin6->sin6_flowinfo = 0;
2629                 memcpy(&sin6->sin6_addr,
2630                        x->props.saddr.a6, sizeof(struct in6_addr));
2631                 sin6->sin6_scope_id = 0;
2632         }
2633 #endif
2634         else
2635                 BUG();
2636
2637         /* NAT_T_SPORT (old port) */
2638         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2639         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2640         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2641         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2642         n_port->sadb_x_nat_t_port_reserved = 0;
2643
2644         /* ADDRESS_DST (new addr) */
2645         addr = (struct sadb_address*)
2646                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2647         addr->sadb_address_len =
2648                 (sizeof(struct sadb_address)+sockaddr_size)/
2649                         sizeof(uint64_t);
2650         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2651         addr->sadb_address_proto = 0;
2652         addr->sadb_address_reserved = 0;
2653         if (x->props.family == AF_INET) {
2654                 addr->sadb_address_prefixlen = 32;
2655
2656                 sin = (struct sockaddr_in *) (addr + 1);
2657                 sin->sin_family = AF_INET;
2658                 sin->sin_addr.s_addr = ipaddr->a4;
2659                 sin->sin_port = 0;
2660                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2661         }
2662 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2663         else if (x->props.family == AF_INET6) {
2664                 addr->sadb_address_prefixlen = 128;
2665
2666                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2667                 sin6->sin6_family = AF_INET6;
2668                 sin6->sin6_port = 0;
2669                 sin6->sin6_flowinfo = 0;
2670                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2671                 sin6->sin6_scope_id = 0;
2672         }
2673 #endif
2674         else
2675                 BUG();
2676
2677         /* NAT_T_DPORT (new port) */
2678         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2679         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2680         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2681         n_port->sadb_x_nat_t_port_port = sport;
2682         n_port->sadb_x_nat_t_port_reserved = 0;
2683
2684         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2685 }
2686
2687 static int pfkey_sendmsg(struct kiocb *kiocb,
2688                          struct socket *sock, struct msghdr *msg, size_t len)
2689 {
2690         struct sock *sk = sock->sk;
2691         struct sk_buff *skb = NULL;
2692         struct sadb_msg *hdr = NULL;
2693         int err;
2694
2695         err = -EOPNOTSUPP;
2696         if (msg->msg_flags & MSG_OOB)
2697                 goto out;
2698
2699         err = -EMSGSIZE;
2700         if ((unsigned)len > sk->sk_sndbuf - 32)
2701                 goto out;
2702
2703         err = -ENOBUFS;
2704         skb = alloc_skb(len, GFP_KERNEL);
2705         if (skb == NULL)
2706                 goto out;
2707
2708         err = -EFAULT;
2709         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2710                 goto out;
2711
2712         hdr = pfkey_get_base_msg(skb, &err);
2713         if (!hdr)
2714                 goto out;
2715
2716         down(&xfrm_cfg_sem);
2717         err = pfkey_process(sk, skb, hdr);
2718         up(&xfrm_cfg_sem);
2719
2720 out:
2721         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2722                 err = 0;
2723         if (skb)
2724                 kfree_skb(skb);
2725
2726         return err ? : len;
2727 }
2728
2729 static int pfkey_recvmsg(struct kiocb *kiocb,
2730                          struct socket *sock, struct msghdr *msg, size_t len,
2731                          int flags)
2732 {
2733         struct sock *sk = sock->sk;
2734         struct sk_buff *skb;
2735         int copied, err;
2736
2737         err = -EINVAL;
2738         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2739                 goto out;
2740
2741         msg->msg_namelen = 0;
2742         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2743         if (skb == NULL)
2744                 goto out;
2745
2746         copied = skb->len;
2747         if (copied > len) {
2748                 msg->msg_flags |= MSG_TRUNC;
2749                 copied = len;
2750         }
2751
2752         skb->h.raw = skb->data;
2753         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2754         if (err)
2755                 goto out_free;
2756
2757         sock_recv_timestamp(msg, sk, skb);
2758
2759         err = (flags & MSG_TRUNC) ? skb->len : copied;
2760
2761 out_free:
2762         skb_free_datagram(sk, skb);
2763 out:
2764         return err;
2765 }
2766
2767 static struct proto_ops pfkey_ops = {
2768         .family         =       PF_KEY,
2769         .owner          =       THIS_MODULE,
2770         /* Operations that make no sense on pfkey sockets. */
2771         .bind           =       sock_no_bind,
2772         .connect        =       sock_no_connect,
2773         .socketpair     =       sock_no_socketpair,
2774         .accept         =       sock_no_accept,
2775         .getname        =       sock_no_getname,
2776         .ioctl          =       sock_no_ioctl,
2777         .listen         =       sock_no_listen,
2778         .shutdown       =       sock_no_shutdown,
2779         .setsockopt     =       sock_no_setsockopt,
2780         .getsockopt     =       sock_no_getsockopt,
2781         .mmap           =       sock_no_mmap,
2782         .sendpage       =       sock_no_sendpage,
2783
2784         /* Now the operations that really occur. */
2785         .release        =       pfkey_release,
2786         .poll           =       datagram_poll,
2787         .sendmsg        =       pfkey_sendmsg,
2788         .recvmsg        =       pfkey_recvmsg,
2789 };
2790
2791 static struct net_proto_family pfkey_family_ops = {
2792         .family =       PF_KEY,
2793         .create =       pfkey_create,
2794         .owner  =       THIS_MODULE,
2795 };
2796
2797 #ifdef CONFIG_PROC_FS
2798 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2799                            int length, int *eof, void *data)
2800 {
2801         off_t pos = 0;
2802         off_t begin = 0;
2803         int len = 0;
2804         struct sock *s;
2805         struct hlist_node *node;
2806
2807         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
2808
2809         read_lock(&pfkey_table_lock);
2810
2811         sk_for_each(s, node, &pfkey_table) {
2812                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2813                                s,
2814                                atomic_read(&s->sk_refcnt),
2815                                atomic_read(&s->sk_rmem_alloc),
2816                                atomic_read(&s->sk_wmem_alloc),
2817                                sock_i_uid(s),
2818                                sock_i_ino(s)
2819                                );
2820
2821                 buffer[len++] = '\n';
2822
2823                 pos = begin + len;
2824                 if (pos < offset) {
2825                         len = 0;
2826                         begin = pos;
2827                 }
2828                 if(pos > offset + length)
2829                         goto done;
2830         }
2831         *eof = 1;
2832
2833 done:
2834         read_unlock(&pfkey_table_lock);
2835
2836         *start = buffer + (offset - begin);
2837         len -= (offset - begin);
2838
2839         if (len > length)
2840                 len = length;
2841         if (len < 0)
2842                 len = 0;
2843
2844         return len;
2845 }
2846 #endif
2847
2848 static struct xfrm_mgr pfkeyv2_mgr =
2849 {
2850         .id             = "pfkeyv2",
2851         .notify         = pfkey_send_notify,
2852         .acquire        = pfkey_send_acquire,
2853         .compile_policy = pfkey_compile_policy,
2854         .new_mapping    = pfkey_send_new_mapping,
2855 };
2856
2857 static void __exit ipsec_pfkey_exit(void)
2858 {
2859         xfrm_unregister_km(&pfkeyv2_mgr);
2860         remove_proc_entry("net/pfkey", NULL);
2861         sock_unregister(PF_KEY);
2862 }
2863
2864 static int __init ipsec_pfkey_init(void)
2865 {
2866         sock_register(&pfkey_family_ops);
2867 #ifdef CONFIG_PROC_FS
2868         create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL);
2869 #endif
2870         xfrm_register_km(&pfkeyv2_mgr);
2871         return 0;
2872 }
2873
2874 module_init(ipsec_pfkey_init);
2875 module_exit(ipsec_pfkey_exit);
2876 MODULE_LICENSE("GPL");
2877 MODULE_ALIAS_NETPROTO(PF_KEY);