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                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1079                         struct sadb_x_nat_t_port* n_port =
1080                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1081                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1082                 }
1083                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1084                         struct sadb_x_nat_t_port* n_port =
1085                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1086                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1087                 }
1088         }
1089
1090         x->type = xfrm_get_type(proto, x->props.family);
1091         if (x->type == NULL) {
1092                 err = -ENOPROTOOPT;
1093                 goto out;
1094         }
1095         if (x->type->init_state(x, NULL)) {
1096                 err = -EINVAL;
1097                 goto out;
1098         }
1099         x->km.seq = hdr->sadb_msg_seq;
1100         x->km.state = XFRM_STATE_VALID;
1101         return x;
1102
1103 out:
1104         x->km.state = XFRM_STATE_DEAD;
1105         xfrm_state_put(x);
1106         return ERR_PTR(err);
1107 }
1108
1109 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1110 {
1111         return -EOPNOTSUPP;
1112 }
1113
1114 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1115 {
1116         struct sk_buff *resp_skb;
1117         struct sadb_x_sa2 *sa2;
1118         struct sadb_address *saddr, *daddr;
1119         struct sadb_msg *out_hdr;
1120         struct xfrm_state *x = NULL;
1121         u8 mode;
1122         u32 reqid;
1123         u8 proto;
1124         unsigned short family;
1125         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1126
1127         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1128                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1129                 return -EINVAL;
1130
1131         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1132         if (proto == 0)
1133                 return -EINVAL;
1134
1135         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1136                 mode = sa2->sadb_x_sa2_mode - 1;
1137                 reqid = sa2->sadb_x_sa2_reqid;
1138         } else {
1139                 mode = 0;
1140                 reqid = 0;
1141         }
1142
1143         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1144         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1145
1146         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1147         switch (family) {
1148         case AF_INET:
1149                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1150                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1151                 break;
1152 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1153         case AF_INET6:
1154                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1155                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1156                 break;
1157 #endif
1158         }
1159         if (xdaddr)
1160                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1161
1162         if (x == NULL)
1163                 return -ENOENT;
1164
1165         resp_skb = ERR_PTR(-ENOENT);
1166
1167         spin_lock_bh(&x->lock);
1168         if (x->km.state != XFRM_STATE_DEAD) {
1169                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1170                 u32 min_spi, max_spi;
1171
1172                 if (range != NULL) {
1173                         min_spi = range->sadb_spirange_min;
1174                         max_spi = range->sadb_spirange_max;
1175                 } else {
1176                         min_spi = htonl(0x100);
1177                         max_spi = htonl(0x0fffffff);
1178                 }
1179                 xfrm_alloc_spi(x, min_spi, max_spi);
1180                 if (x->id.spi)
1181                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1182         }
1183         spin_unlock_bh(&x->lock);
1184
1185         if (IS_ERR(resp_skb)) {
1186                 xfrm_state_put(x);
1187                 return  PTR_ERR(resp_skb);
1188         }
1189
1190         out_hdr = (struct sadb_msg *) resp_skb->data;
1191         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1192         out_hdr->sadb_msg_type = SADB_GETSPI;
1193         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1194         out_hdr->sadb_msg_errno = 0;
1195         out_hdr->sadb_msg_reserved = 0;
1196         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1197         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1198
1199         xfrm_state_put(x);
1200
1201         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1202
1203         return 0;
1204 }
1205
1206 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1207 {
1208         struct xfrm_state *x;
1209
1210         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1211                 return -EOPNOTSUPP;
1212
1213         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1214                 return 0;
1215
1216         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1217         if (x == NULL)
1218                 return 0;
1219
1220         spin_lock_bh(&x->lock);
1221         if (x->km.state == XFRM_STATE_ACQ) {
1222                 x->km.state = XFRM_STATE_ERROR;
1223                 wake_up(&km_waitq);
1224         }
1225         spin_unlock_bh(&x->lock);
1226         xfrm_state_put(x);
1227         return 0;
1228 }
1229
1230
1231 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1232 {
1233         struct sk_buff *out_skb;
1234         struct sadb_msg *out_hdr;
1235         struct xfrm_state *x;
1236         int err;
1237
1238         xfrm_probe_algs();
1239
1240         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1241         if (IS_ERR(x))
1242                 return PTR_ERR(x);
1243
1244         if (hdr->sadb_msg_type == SADB_ADD)
1245                 err = xfrm_state_add(x);
1246         else
1247                 err = xfrm_state_update(x);
1248
1249         if (err < 0) {
1250                 x->km.state = XFRM_STATE_DEAD;
1251                 xfrm_state_put(x);
1252                 return err;
1253         }
1254
1255         out_skb = pfkey_xfrm_state2msg(x, 0, 3);
1256         if (IS_ERR(out_skb))
1257                 return  PTR_ERR(out_skb); /* XXX Should we return 0 here ? */
1258
1259         out_hdr = (struct sadb_msg *) out_skb->data;
1260         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1261         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1262         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1263         out_hdr->sadb_msg_errno = 0;
1264         out_hdr->sadb_msg_reserved = 0;
1265         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1266         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1267
1268         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1269
1270         return 0;
1271 }
1272
1273 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1274 {
1275         struct xfrm_state *x;
1276
1277         if (!ext_hdrs[SADB_EXT_SA-1] ||
1278             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1279                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1280                 return -EINVAL;
1281
1282         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1283         if (x == NULL)
1284                 return -ESRCH;
1285
1286         if (xfrm_state_kern(x)) {
1287                 xfrm_state_put(x);
1288                 return -EPERM;
1289         }
1290
1291         xfrm_state_delete(x);
1292         xfrm_state_put(x);
1293
1294         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
1295                         BROADCAST_ALL, sk);
1296
1297         return 0;
1298 }
1299
1300 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1301 {
1302         __u8 proto;
1303         struct sk_buff *out_skb;
1304         struct sadb_msg *out_hdr;
1305         struct xfrm_state *x;
1306
1307         if (!ext_hdrs[SADB_EXT_SA-1] ||
1308             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1309                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1310                 return -EINVAL;
1311
1312         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1313         if (x == NULL)
1314                 return -ESRCH;
1315
1316         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1317         proto = x->id.proto;
1318         xfrm_state_put(x);
1319         if (IS_ERR(out_skb))
1320                 return  PTR_ERR(out_skb);
1321
1322         out_hdr = (struct sadb_msg *) out_skb->data;
1323         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1324         out_hdr->sadb_msg_type = SADB_DUMP;
1325         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1326         out_hdr->sadb_msg_errno = 0;
1327         out_hdr->sadb_msg_reserved = 0;
1328         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1329         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1330         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1331
1332         return 0;
1333 }
1334
1335 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1336 {
1337         struct sk_buff *skb;
1338         struct sadb_msg *hdr;
1339         int len, auth_len, enc_len, i;
1340
1341         auth_len = xfrm_count_auth_supported();
1342         if (auth_len) {
1343                 auth_len *= sizeof(struct sadb_alg);
1344                 auth_len += sizeof(struct sadb_supported);
1345         }
1346
1347         enc_len = xfrm_count_enc_supported();
1348         if (enc_len) {
1349                 enc_len *= sizeof(struct sadb_alg);
1350                 enc_len += sizeof(struct sadb_supported);
1351         }
1352
1353         len = enc_len + auth_len + sizeof(struct sadb_msg);
1354
1355         skb = alloc_skb(len + 16, allocation);
1356         if (!skb)
1357                 goto out_put_algs;
1358
1359         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1360         pfkey_hdr_dup(hdr, orig);
1361         hdr->sadb_msg_errno = 0;
1362         hdr->sadb_msg_len = len / sizeof(uint64_t);
1363
1364         if (auth_len) {
1365                 struct sadb_supported *sp;
1366                 struct sadb_alg *ap;
1367
1368                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1369                 ap = (struct sadb_alg *) (sp + 1);
1370
1371                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1372                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1373
1374                 for (i = 0; ; i++) {
1375                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1376                         if (!aalg)
1377                                 break;
1378                         if (aalg->available)
1379                                 *ap++ = aalg->desc;
1380                 }
1381         }
1382
1383         if (enc_len) {
1384                 struct sadb_supported *sp;
1385                 struct sadb_alg *ap;
1386
1387                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1388                 ap = (struct sadb_alg *) (sp + 1);
1389
1390                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1391                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1392
1393                 for (i = 0; ; i++) {
1394                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1395                         if (!ealg)
1396                                 break;
1397                         if (ealg->available)
1398                                 *ap++ = ealg->desc;
1399                 }
1400         }
1401
1402 out_put_algs:
1403         return skb;
1404 }
1405
1406 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1407 {
1408         struct pfkey_opt *pfk = pfkey_sk(sk);
1409         struct sk_buff *supp_skb;
1410
1411         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1412                 return -EINVAL;
1413
1414         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1415                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1416                         return -EEXIST;
1417                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1418         }
1419
1420         xfrm_probe_algs();
1421
1422         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1423         if (!supp_skb) {
1424                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1425                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1426
1427                 return -ENOBUFS;
1428         }
1429
1430         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1431
1432         return 0;
1433 }
1434
1435 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1436 {
1437         unsigned proto;
1438         struct sk_buff *skb_out;
1439         struct sadb_msg *hdr_out;
1440
1441         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1442         if (proto == 0)
1443                 return -EINVAL;
1444
1445         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
1446         if (!skb_out)
1447                 return -ENOBUFS;
1448
1449         xfrm_state_flush(proto);
1450
1451         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
1452         pfkey_hdr_dup(hdr_out, hdr);
1453         hdr_out->sadb_msg_errno = (uint8_t) 0;
1454         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1455
1456         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
1457
1458         return 0;
1459 }
1460
1461 struct pfkey_dump_data
1462 {
1463         struct sk_buff *skb;
1464         struct sadb_msg *hdr;
1465         struct sock *sk;
1466 };
1467
1468 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1469 {
1470         struct pfkey_dump_data *data = ptr;
1471         struct sk_buff *out_skb;
1472         struct sadb_msg *out_hdr;
1473
1474         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1475         if (IS_ERR(out_skb))
1476                 return PTR_ERR(out_skb);
1477
1478         out_hdr = (struct sadb_msg *) out_skb->data;
1479         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1480         out_hdr->sadb_msg_type = SADB_DUMP;
1481         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1482         out_hdr->sadb_msg_errno = 0;
1483         out_hdr->sadb_msg_reserved = 0;
1484         out_hdr->sadb_msg_seq = count;
1485         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1486         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1487         return 0;
1488 }
1489
1490 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1491 {
1492         u8 proto;
1493         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1494
1495         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1496         if (proto == 0)
1497                 return -EINVAL;
1498
1499         return xfrm_state_walk(proto, dump_sa, &data);
1500 }
1501
1502 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1503 {
1504         struct pfkey_opt *pfk = pfkey_sk(sk);
1505         int satype = hdr->sadb_msg_satype;
1506
1507         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1508                 /* XXX we mangle packet... */
1509                 hdr->sadb_msg_errno = 0;
1510                 if (satype != 0 && satype != 1)
1511                         return -EINVAL;
1512                 pfk->promisc = satype;
1513         }
1514         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1515         return 0;
1516 }
1517
1518 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1519 {
1520         int i;
1521         u32 reqid = *(u32*)ptr;
1522
1523         for (i=0; i<xp->xfrm_nr; i++) {
1524                 if (xp->xfrm_vec[i].reqid == reqid)
1525                         return -EEXIST;
1526         }
1527         return 0;
1528 }
1529
1530 static u32 gen_reqid(void)
1531 {
1532         u32 start;
1533         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1534
1535         start = reqid;
1536         do {
1537                 ++reqid;
1538                 if (reqid == 0)
1539                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1540                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1541                         return reqid;
1542         } while (reqid != start);
1543         return 0;
1544 }
1545
1546 static int
1547 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1548 {
1549         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1550         struct sockaddr_in *sin;
1551 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1552         struct sockaddr_in6 *sin6;
1553 #endif
1554
1555         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1556                 return -ELOOP;
1557
1558         if (rq->sadb_x_ipsecrequest_mode == 0)
1559                 return -EINVAL;
1560
1561         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1562         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1563         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1564                 t->optional = 1;
1565         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1566                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1567                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1568                         t->reqid = 0;
1569                 if (!t->reqid && !(t->reqid = gen_reqid()))
1570                         return -ENOBUFS;
1571         }
1572
1573         /* addresses present only in tunnel mode */
1574         if (t->mode) {
1575                 switch (xp->family) {
1576                 case AF_INET:
1577                         sin = (void*)(rq+1);
1578                         if (sin->sin_family != AF_INET)
1579                                 return -EINVAL;
1580                         t->saddr.a4 = sin->sin_addr.s_addr;
1581                         sin++;
1582                         if (sin->sin_family != AF_INET)
1583                                 return -EINVAL;
1584                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1585                         break;
1586 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1587                 case AF_INET6:
1588                         sin6 = (void *)(rq+1);
1589                         if (sin6->sin6_family != AF_INET6)
1590                                 return -EINVAL;
1591                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1592                         sin6++;
1593                         if (sin6->sin6_family != AF_INET6)
1594                                 return -EINVAL;
1595                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1596                         break;
1597 #endif
1598                 default:
1599                         return -EINVAL;
1600                 }
1601         }
1602         /* No way to set this via kame pfkey */
1603         t->aalgos = t->ealgos = t->calgos = ~0;
1604         xp->xfrm_nr++;
1605         return 0;
1606 }
1607
1608 static int
1609 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1610 {
1611         int err;
1612         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1613         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1614
1615         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1616                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1617                         return err;
1618                 len -= rq->sadb_x_ipsecrequest_len;
1619                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1620         }
1621         return 0;
1622 }
1623
1624 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1625 {
1626         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1627         int socklen = (xp->family == AF_INET ?
1628                        sizeof(struct sockaddr_in) :
1629                        sizeof(struct sockaddr_in6));
1630
1631         return sizeof(struct sadb_msg) +
1632                 (sizeof(struct sadb_lifetime) * 3) +
1633                 (sizeof(struct sadb_address) * 2) +
1634                 (sockaddr_size * 2) +
1635                 sizeof(struct sadb_x_policy) +
1636                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1637                                 (socklen * 2)));
1638 }
1639
1640 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1641 {
1642         struct sk_buff *skb;
1643         int size;
1644
1645         size = pfkey_xfrm_policy2msg_size(xp);
1646
1647         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1648         if (skb == NULL)
1649                 return ERR_PTR(-ENOBUFS);
1650
1651         return skb;
1652 }
1653
1654 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1655 {
1656         struct sadb_msg *hdr;
1657         struct sadb_address *addr;
1658         struct sadb_lifetime *lifetime;
1659         struct sadb_x_policy *pol;
1660         struct sockaddr_in   *sin;
1661 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1662         struct sockaddr_in6  *sin6;
1663 #endif
1664         int i;
1665         int size;
1666         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1667         int socklen = (xp->family == AF_INET ?
1668                        sizeof(struct sockaddr_in) :
1669                        sizeof(struct sockaddr_in6));
1670
1671         size = pfkey_xfrm_policy2msg_size(xp);
1672
1673         /* call should fill header later */
1674         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1675         memset(hdr, 0, size);   /* XXX do we need this ? */
1676
1677         /* src address */
1678         addr = (struct sadb_address*) skb_put(skb,
1679                                               sizeof(struct sadb_address)+sockaddr_size);
1680         addr->sadb_address_len =
1681                 (sizeof(struct sadb_address)+sockaddr_size)/
1682                         sizeof(uint64_t);
1683         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1684         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1685         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1686         addr->sadb_address_reserved = 0;
1687         /* src address */
1688         if (xp->family == AF_INET) {
1689                 sin = (struct sockaddr_in *) (addr + 1);
1690                 sin->sin_family = AF_INET;
1691                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1692                 sin->sin_port = xp->selector.sport;
1693                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1694         }
1695 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1696         else if (xp->family == AF_INET6) {
1697                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1698                 sin6->sin6_family = AF_INET6;
1699                 sin6->sin6_port = xp->selector.sport;
1700                 sin6->sin6_flowinfo = 0;
1701                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1702                        sizeof(struct in6_addr));
1703                 sin6->sin6_scope_id = 0;
1704         }
1705 #endif
1706         else
1707                 BUG();
1708
1709         /* dst address */
1710         addr = (struct sadb_address*) skb_put(skb,
1711                                               sizeof(struct sadb_address)+sockaddr_size);
1712         addr->sadb_address_len =
1713                 (sizeof(struct sadb_address)+sockaddr_size)/
1714                         sizeof(uint64_t);
1715         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1716         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1717         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1718         addr->sadb_address_reserved = 0;
1719         if (xp->family == AF_INET) {
1720                 sin = (struct sockaddr_in *) (addr + 1);
1721                 sin->sin_family = AF_INET;
1722                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1723                 sin->sin_port = xp->selector.dport;
1724                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1725         }
1726 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1727         else if (xp->family == AF_INET6) {
1728                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1729                 sin6->sin6_family = AF_INET6;
1730                 sin6->sin6_port = xp->selector.dport;
1731                 sin6->sin6_flowinfo = 0;
1732                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1733                        sizeof(struct in6_addr));
1734                 sin6->sin6_scope_id = 0;
1735         }
1736 #endif
1737         else
1738                 BUG();
1739
1740         /* hard time */
1741         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1742                                                      sizeof(struct sadb_lifetime));
1743         lifetime->sadb_lifetime_len =
1744                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1745         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1746         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1747         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1748         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1749         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1750         /* soft time */
1751         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1752                                                      sizeof(struct sadb_lifetime));
1753         lifetime->sadb_lifetime_len =
1754                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1755         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1756         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1757         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1758         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1759         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1760         /* current time */
1761         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1762                                                      sizeof(struct sadb_lifetime));
1763         lifetime->sadb_lifetime_len =
1764                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1765         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1766         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1767         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1768         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1769         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1770
1771         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1772         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1773         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1774         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1775         if (xp->action == XFRM_POLICY_ALLOW) {
1776                 if (xp->xfrm_nr)
1777                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1778                 else
1779                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1780         }
1781         pol->sadb_x_policy_dir = dir+1;
1782         pol->sadb_x_policy_id = xp->index;
1783         pol->sadb_x_policy_priority = xp->priority;
1784
1785         for (i=0; i<xp->xfrm_nr; i++) {
1786                 struct sadb_x_ipsecrequest *rq;
1787                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1788                 int req_size;
1789
1790                 req_size = sizeof(struct sadb_x_ipsecrequest);
1791                 if (t->mode)
1792                         req_size += 2*socklen;
1793                 else
1794                         size -= 2*socklen;
1795                 rq = (void*)skb_put(skb, req_size);
1796                 pol->sadb_x_policy_len += req_size/8;
1797                 memset(rq, 0, sizeof(*rq));
1798                 rq->sadb_x_ipsecrequest_len = req_size;
1799                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1800                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1801                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1802                 if (t->reqid)
1803                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1804                 if (t->optional)
1805                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1806                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1807                 if (t->mode) {
1808                         switch (xp->family) {
1809                         case AF_INET:
1810                                 sin = (void*)(rq+1);
1811                                 sin->sin_family = AF_INET;
1812                                 sin->sin_addr.s_addr = t->saddr.a4;
1813                                 sin->sin_port = 0;
1814                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1815                                 sin++;
1816                                 sin->sin_family = AF_INET;
1817                                 sin->sin_addr.s_addr = t->id.daddr.a4;
1818                                 sin->sin_port = 0;
1819                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1820                                 break;
1821 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1822                         case AF_INET6:
1823                                 sin6 = (void*)(rq+1);
1824                                 sin6->sin6_family = AF_INET6;
1825                                 sin6->sin6_port = 0;
1826                                 sin6->sin6_flowinfo = 0;
1827                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
1828                                        sizeof(struct in6_addr));
1829                                 sin6->sin6_scope_id = 0;
1830
1831                                 sin6++;
1832                                 sin6->sin6_family = AF_INET6;
1833                                 sin6->sin6_port = 0;
1834                                 sin6->sin6_flowinfo = 0;
1835                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1836                                        sizeof(struct in6_addr));
1837                                 sin6->sin6_scope_id = 0;
1838                                 break;
1839 #endif
1840                         default:
1841                                 break;
1842                         }
1843                 }
1844         }
1845         hdr->sadb_msg_len = size / sizeof(uint64_t);
1846         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1847 }
1848
1849 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1850 {
1851         int err;
1852         struct sadb_lifetime *lifetime;
1853         struct sadb_address *sa;
1854         struct sadb_x_policy *pol;
1855         struct xfrm_policy *xp;
1856         struct sk_buff *out_skb;
1857         struct sadb_msg *out_hdr;
1858
1859         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1860                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1861             !ext_hdrs[SADB_X_EXT_POLICY-1])
1862                 return -EINVAL;
1863
1864         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1865         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1866                 return -EINVAL;
1867         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1868                 return -EINVAL;
1869
1870         xp = xfrm_policy_alloc(GFP_KERNEL);
1871         if (xp == NULL)
1872                 return -ENOBUFS;
1873
1874         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
1875                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
1876         xp->priority = pol->sadb_x_policy_priority;
1877
1878         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1879         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
1880         if (!xp->family) {
1881                 err = -EINVAL;
1882                 goto out;
1883         }
1884         xp->selector.family = xp->family;
1885         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
1886         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1887         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1888         if (xp->selector.sport)
1889                 xp->selector.sport_mask = ~0;
1890
1891         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1892         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
1893         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
1894
1895         /* Amusing, we set this twice.  KAME apps appear to set same value
1896          * in both addresses.
1897          */
1898         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1899
1900         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
1901         if (xp->selector.dport)
1902                 xp->selector.dport_mask = ~0;
1903
1904         xp->lft.soft_byte_limit = XFRM_INF;
1905         xp->lft.hard_byte_limit = XFRM_INF;
1906         xp->lft.soft_packet_limit = XFRM_INF;
1907         xp->lft.hard_packet_limit = XFRM_INF;
1908         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
1909                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1910                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1911                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1912                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1913         }
1914         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
1915                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1916                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1917                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1918                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1919         }
1920         xp->xfrm_nr = 0;
1921         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
1922             (err = parse_ipsecrequests(xp, pol)) < 0)
1923                 goto out;
1924
1925         out_skb = pfkey_xfrm_policy2msg_prep(xp);
1926         if (IS_ERR(out_skb)) {
1927                 err =  PTR_ERR(out_skb);
1928                 goto out;
1929         }
1930
1931         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
1932                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
1933         if (err) {
1934                 kfree_skb(out_skb);
1935                 goto out;
1936         }
1937
1938         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
1939
1940         xfrm_pol_put(xp);
1941
1942         out_hdr = (struct sadb_msg *) out_skb->data;
1943         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1944         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1945         out_hdr->sadb_msg_satype = 0;
1946         out_hdr->sadb_msg_errno = 0;
1947         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1948         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1949         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1950         return 0;
1951
1952 out:
1953         kfree(xp);
1954         return err;
1955 }
1956
1957 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1958 {
1959         int err;
1960         struct sadb_address *sa;
1961         struct sadb_x_policy *pol;
1962         struct xfrm_policy *xp;
1963         struct sk_buff *out_skb;
1964         struct sadb_msg *out_hdr;
1965         struct xfrm_selector sel;
1966
1967         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1968                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1969             !ext_hdrs[SADB_X_EXT_POLICY-1])
1970                 return -EINVAL;
1971
1972         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1973         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1974                 return -EINVAL;
1975
1976         memset(&sel, 0, sizeof(sel));
1977
1978         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1979         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
1980         sel.prefixlen_s = sa->sadb_address_prefixlen;
1981         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1982         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1983         if (sel.sport)
1984                 sel.sport_mask = ~0;
1985
1986         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1987         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
1988         sel.prefixlen_d = sa->sadb_address_prefixlen;
1989         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1990         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
1991         if (sel.dport)
1992                 sel.dport_mask = ~0;
1993
1994         xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
1995         if (xp == NULL)
1996                 return -ENOENT;
1997
1998         err = 0;
1999
2000         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2001         if (IS_ERR(out_skb)) {
2002                 err =  PTR_ERR(out_skb);
2003                 goto out;
2004         }
2005         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2006
2007         out_hdr = (struct sadb_msg *) out_skb->data;
2008         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2009         out_hdr->sadb_msg_type = SADB_X_SPDDELETE;
2010         out_hdr->sadb_msg_satype = 0;
2011         out_hdr->sadb_msg_errno = 0;
2012         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2013         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2014         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2015         err = 0;
2016
2017 out:
2018         xfrm_pol_put(xp);
2019         return err;
2020 }
2021
2022 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2023 {
2024         int err;
2025         struct sadb_x_policy *pol;
2026         struct xfrm_policy *xp;
2027         struct sk_buff *out_skb;
2028         struct sadb_msg *out_hdr;
2029
2030         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2031                 return -EINVAL;
2032
2033         xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2034                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2035         if (xp == NULL)
2036                 return -ENOENT;
2037
2038         err = 0;
2039
2040         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2041         if (IS_ERR(out_skb)) {
2042                 err =  PTR_ERR(out_skb);
2043                 goto out;
2044         }
2045         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2046
2047         out_hdr = (struct sadb_msg *) out_skb->data;
2048         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2049         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2050         out_hdr->sadb_msg_satype = 0;
2051         out_hdr->sadb_msg_errno = 0;
2052         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2053         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2054         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2055         err = 0;
2056
2057 out:
2058         xfrm_pol_put(xp);
2059         return err;
2060 }
2061
2062 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2063 {
2064         struct pfkey_dump_data *data = ptr;
2065         struct sk_buff *out_skb;
2066         struct sadb_msg *out_hdr;
2067
2068         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2069         if (IS_ERR(out_skb))
2070                 return PTR_ERR(out_skb);
2071
2072         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2073
2074         out_hdr = (struct sadb_msg *) out_skb->data;
2075         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2076         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2077         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2078         out_hdr->sadb_msg_errno = 0;
2079         out_hdr->sadb_msg_seq = count;
2080         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2081         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2082         return 0;
2083 }
2084
2085 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2086 {
2087         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2088
2089         return xfrm_policy_walk(dump_sp, &data);
2090 }
2091
2092 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2093 {
2094         struct sk_buff *skb_out;
2095         struct sadb_msg *hdr_out;
2096
2097         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
2098         if (!skb_out)
2099                 return -ENOBUFS;
2100
2101         xfrm_policy_flush();
2102
2103         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2104         pfkey_hdr_dup(hdr_out, hdr);
2105         hdr_out->sadb_msg_errno = (uint8_t) 0;
2106         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2107         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
2108
2109         return 0;
2110 }
2111
2112 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2113                              struct sadb_msg *hdr, void **ext_hdrs);
2114 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2115         [SADB_RESERVED]         = pfkey_reserved,
2116         [SADB_GETSPI]           = pfkey_getspi,
2117         [SADB_UPDATE]           = pfkey_add,
2118         [SADB_ADD]              = pfkey_add,
2119         [SADB_DELETE]           = pfkey_delete,
2120         [SADB_GET]              = pfkey_get,
2121         [SADB_ACQUIRE]          = pfkey_acquire,
2122         [SADB_REGISTER]         = pfkey_register,
2123         [SADB_EXPIRE]           = NULL,
2124         [SADB_FLUSH]            = pfkey_flush,
2125         [SADB_DUMP]             = pfkey_dump,
2126         [SADB_X_PROMISC]        = pfkey_promisc,
2127         [SADB_X_PCHANGE]        = NULL,
2128         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2129         [SADB_X_SPDADD]         = pfkey_spdadd,
2130         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2131         [SADB_X_SPDGET]         = pfkey_spdget,
2132         [SADB_X_SPDACQUIRE]     = NULL,
2133         [SADB_X_SPDDUMP]        = pfkey_spddump,
2134         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2135         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2136         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2137 };
2138
2139 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2140 {
2141         void *ext_hdrs[SADB_EXT_MAX];
2142         int err;
2143
2144         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2145                         BROADCAST_PROMISC_ONLY, NULL);
2146
2147         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2148         err = parse_exthdrs(skb, hdr, ext_hdrs);
2149         if (!err) {
2150                 err = -EOPNOTSUPP;
2151                 if (pfkey_funcs[hdr->sadb_msg_type])
2152                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2153         }
2154         return err;
2155 }
2156
2157 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2158 {
2159         struct sadb_msg *hdr = NULL;
2160
2161         if (skb->len < sizeof(*hdr)) {
2162                 *errp = -EMSGSIZE;
2163         } else {
2164                 hdr = (struct sadb_msg *) skb->data;
2165                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2166                     hdr->sadb_msg_reserved != 0 ||
2167                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2168                      hdr->sadb_msg_type > SADB_MAX)) {
2169                         hdr = NULL;
2170                         *errp = -EINVAL;
2171                 } else if (hdr->sadb_msg_len != (skb->len /
2172                                                  sizeof(uint64_t)) ||
2173                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2174                                                 sizeof(uint64_t))) {
2175                         hdr = NULL;
2176                         *errp = -EMSGSIZE;
2177                 } else {
2178                         *errp = 0;
2179                 }
2180         }
2181         return hdr;
2182 }
2183
2184 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2185 {
2186         return t->aalgos & (1 << d->desc.sadb_alg_id);
2187 }
2188
2189 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2190 {
2191         return t->ealgos & (1 << d->desc.sadb_alg_id);
2192 }
2193
2194 static int count_ah_combs(struct xfrm_tmpl *t)
2195 {
2196         int i, sz = 0;
2197
2198         for (i = 0; ; i++) {
2199                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2200                 if (!aalg)
2201                         break;
2202                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2203                         sz += sizeof(struct sadb_comb);
2204         }
2205         return sz + sizeof(struct sadb_prop);
2206 }
2207
2208 static int count_esp_combs(struct xfrm_tmpl *t)
2209 {
2210         int i, k, sz = 0;
2211
2212         for (i = 0; ; i++) {
2213                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2214                 if (!ealg)
2215                         break;
2216
2217                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2218                         continue;
2219
2220                 for (k = 1; ; k++) {
2221                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2222                         if (!aalg)
2223                                 break;
2224
2225                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2226                                 sz += sizeof(struct sadb_comb);
2227                 }
2228         }
2229         return sz + sizeof(struct sadb_prop);
2230 }
2231
2232 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2233 {
2234         struct sadb_prop *p;
2235         int i;
2236
2237         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2238         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2239         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2240         p->sadb_prop_replay = 32;
2241         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2242
2243         for (i = 0; ; i++) {
2244                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2245                 if (!aalg)
2246                         break;
2247
2248                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2249                         struct sadb_comb *c;
2250                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2251                         memset(c, 0, sizeof(*c));
2252                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2253                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2254                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2255                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2256                         c->sadb_comb_hard_addtime = 24*60*60;
2257                         c->sadb_comb_soft_addtime = 20*60*60;
2258                         c->sadb_comb_hard_usetime = 8*60*60;
2259                         c->sadb_comb_soft_usetime = 7*60*60;
2260                 }
2261         }
2262 }
2263
2264 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2265 {
2266         struct sadb_prop *p;
2267         int i, k;
2268
2269         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2270         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2271         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2272         p->sadb_prop_replay = 32;
2273         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2274
2275         for (i=0; ; i++) {
2276                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2277                 if (!ealg)
2278                         break;
2279
2280                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2281                         continue;
2282
2283                 for (k = 1; ; k++) {
2284                         struct sadb_comb *c;
2285                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2286                         if (!aalg)
2287                                 break;
2288                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2289                                 continue;
2290                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2291                         memset(c, 0, sizeof(*c));
2292                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2293                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2294                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2295                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2296                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2297                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2298                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2299                         c->sadb_comb_hard_addtime = 24*60*60;
2300                         c->sadb_comb_soft_addtime = 20*60*60;
2301                         c->sadb_comb_hard_usetime = 8*60*60;
2302                         c->sadb_comb_soft_usetime = 7*60*60;
2303                 }
2304         }
2305 }
2306
2307 static int pfkey_send_notify(struct xfrm_state *x, int hard)
2308 {
2309         struct sk_buff *out_skb;
2310         struct sadb_msg *out_hdr;
2311         int hsc = (hard ? 2 : 1);
2312
2313         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2314         if (IS_ERR(out_skb))
2315                 return PTR_ERR(out_skb);
2316
2317         out_hdr = (struct sadb_msg *) out_skb->data;
2318         out_hdr->sadb_msg_version = PF_KEY_V2;
2319         out_hdr->sadb_msg_type = SADB_EXPIRE;
2320         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2321         out_hdr->sadb_msg_errno = 0;
2322         out_hdr->sadb_msg_reserved = 0;
2323         out_hdr->sadb_msg_seq = 0;
2324         out_hdr->sadb_msg_pid = 0;
2325
2326         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2327         return 0;
2328 }
2329
2330 static u32 get_acqseq(void)
2331 {
2332         u32 res;
2333         static u32 acqseq;
2334         static spinlock_t acqseq_lock = SPIN_LOCK_UNLOCKED;
2335
2336         spin_lock_bh(&acqseq_lock);
2337         res = (++acqseq ? : ++acqseq);
2338         spin_unlock_bh(&acqseq_lock);
2339         return res;
2340 }
2341
2342 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2343 {
2344         struct sk_buff *skb;
2345         struct sadb_msg *hdr;
2346         struct sadb_address *addr;
2347         struct sadb_x_policy *pol;
2348         struct sockaddr_in *sin;
2349 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2350         struct sockaddr_in6 *sin6;
2351 #endif
2352         int sockaddr_size;
2353         int size;
2354
2355         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2356         if (!sockaddr_size)
2357                 return -EINVAL;
2358
2359         size = sizeof(struct sadb_msg) +
2360                 (sizeof(struct sadb_address) * 2) +
2361                 (sockaddr_size * 2) +
2362                 sizeof(struct sadb_x_policy);
2363
2364         if (x->id.proto == IPPROTO_AH)
2365                 size += count_ah_combs(t);
2366         else if (x->id.proto == IPPROTO_ESP)
2367                 size += count_esp_combs(t);
2368
2369         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2370         if (skb == NULL)
2371                 return -ENOMEM;
2372
2373         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2374         hdr->sadb_msg_version = PF_KEY_V2;
2375         hdr->sadb_msg_type = SADB_ACQUIRE;
2376         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2377         hdr->sadb_msg_len = size / sizeof(uint64_t);
2378         hdr->sadb_msg_errno = 0;
2379         hdr->sadb_msg_reserved = 0;
2380         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2381         hdr->sadb_msg_pid = 0;
2382
2383         /* src address */
2384         addr = (struct sadb_address*) skb_put(skb,
2385                                               sizeof(struct sadb_address)+sockaddr_size);
2386         addr->sadb_address_len =
2387                 (sizeof(struct sadb_address)+sockaddr_size)/
2388                         sizeof(uint64_t);
2389         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2390         addr->sadb_address_proto = 0;
2391         addr->sadb_address_reserved = 0;
2392         if (x->props.family == AF_INET) {
2393                 addr->sadb_address_prefixlen = 32;
2394
2395                 sin = (struct sockaddr_in *) (addr + 1);
2396                 sin->sin_family = AF_INET;
2397                 sin->sin_addr.s_addr = x->props.saddr.a4;
2398                 sin->sin_port = 0;
2399                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2400         }
2401 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2402         else if (x->props.family == AF_INET6) {
2403                 addr->sadb_address_prefixlen = 128;
2404
2405                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2406                 sin6->sin6_family = AF_INET6;
2407                 sin6->sin6_port = 0;
2408                 sin6->sin6_flowinfo = 0;
2409                 memcpy(&sin6->sin6_addr,
2410                        x->props.saddr.a6, sizeof(struct in6_addr));
2411                 sin6->sin6_scope_id = 0;
2412         }
2413 #endif
2414         else
2415                 BUG();
2416
2417         /* dst address */
2418         addr = (struct sadb_address*) skb_put(skb,
2419                                               sizeof(struct sadb_address)+sockaddr_size);
2420         addr->sadb_address_len =
2421                 (sizeof(struct sadb_address)+sockaddr_size)/
2422                         sizeof(uint64_t);
2423         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2424         addr->sadb_address_proto = 0;
2425         addr->sadb_address_reserved = 0;
2426         if (x->props.family == AF_INET) {
2427                 addr->sadb_address_prefixlen = 32;
2428
2429                 sin = (struct sockaddr_in *) (addr + 1);
2430                 sin->sin_family = AF_INET;
2431                 sin->sin_addr.s_addr = x->id.daddr.a4;
2432                 sin->sin_port = 0;
2433                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2434         }
2435 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2436         else if (x->props.family == AF_INET6) {
2437                 addr->sadb_address_prefixlen = 128;
2438
2439                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2440                 sin6->sin6_family = AF_INET6;
2441                 sin6->sin6_port = 0;
2442                 sin6->sin6_flowinfo = 0;
2443                 memcpy(&sin6->sin6_addr,
2444                        x->id.daddr.a6, sizeof(struct in6_addr));
2445                 sin6->sin6_scope_id = 0;
2446         }
2447 #endif
2448         else
2449                 BUG();
2450
2451         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2452         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2453         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2454         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2455         pol->sadb_x_policy_dir = dir+1;
2456         pol->sadb_x_policy_id = xp->index;
2457
2458         /* Set sadb_comb's. */
2459         if (x->id.proto == IPPROTO_AH)
2460                 dump_ah_combs(skb, t);
2461         else if (x->id.proto == IPPROTO_ESP)
2462                 dump_esp_combs(skb, t);
2463
2464         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2465 }
2466
2467 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2468                                                 u8 *data, int len, int *dir)
2469 {
2470         struct xfrm_policy *xp;
2471         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2472
2473         switch (family) {
2474         case AF_INET:
2475                 if (opt != IP_IPSEC_POLICY) {
2476                         *dir = -EOPNOTSUPP;
2477                         return NULL;
2478                 }
2479                 break;
2480 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2481         case AF_INET6:
2482                 if (opt != IPV6_IPSEC_POLICY) {
2483                         *dir = -EOPNOTSUPP;
2484                         return NULL;
2485                 }
2486                 break;
2487 #endif
2488         default:
2489                 *dir = -EINVAL;
2490                 return NULL;
2491         }
2492
2493         *dir = -EINVAL;
2494
2495         if (len < sizeof(struct sadb_x_policy) ||
2496             pol->sadb_x_policy_len*8 > len ||
2497             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2498             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2499                 return NULL;
2500
2501         xp = xfrm_policy_alloc(GFP_ATOMIC);
2502         if (xp == NULL) {
2503                 *dir = -ENOBUFS;
2504                 return NULL;
2505         }
2506
2507         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2508                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2509
2510         xp->lft.soft_byte_limit = XFRM_INF;
2511         xp->lft.hard_byte_limit = XFRM_INF;
2512         xp->lft.soft_packet_limit = XFRM_INF;
2513         xp->lft.hard_packet_limit = XFRM_INF;
2514         xp->family = family;
2515
2516         xp->xfrm_nr = 0;
2517         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2518             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2519                 goto out;
2520
2521         *dir = pol->sadb_x_policy_dir-1;
2522         return xp;
2523
2524 out:
2525         kfree(xp);
2526         return NULL;
2527 }
2528
2529 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2530 {
2531         struct sk_buff *skb;
2532         struct sadb_msg *hdr;
2533         struct sadb_sa *sa;
2534         struct sadb_address *addr;
2535         struct sadb_x_nat_t_port *n_port;
2536         struct sockaddr_in *sin;
2537 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2538         struct sockaddr_in6 *sin6;
2539 #endif
2540         int sockaddr_size;
2541         int size;
2542         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2543         struct xfrm_encap_tmpl *natt = NULL;
2544
2545         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2546         if (!sockaddr_size)
2547                 return -EINVAL;
2548
2549         if (!satype)
2550                 return -EINVAL;
2551
2552         if (!x->encap)
2553                 return -EINVAL;
2554
2555         natt = x->encap;
2556
2557         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2558          *
2559          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2560          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2561          */
2562
2563         size = sizeof(struct sadb_msg) +
2564                 sizeof(struct sadb_sa) +
2565                 (sizeof(struct sadb_address) * 2) +
2566                 (sockaddr_size * 2) +
2567                 (sizeof(struct sadb_x_nat_t_port) * 2);
2568
2569         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2570         if (skb == NULL)
2571                 return -ENOMEM;
2572
2573         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2574         hdr->sadb_msg_version = PF_KEY_V2;
2575         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2576         hdr->sadb_msg_satype = satype;
2577         hdr->sadb_msg_len = size / sizeof(uint64_t);
2578         hdr->sadb_msg_errno = 0;
2579         hdr->sadb_msg_reserved = 0;
2580         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2581         hdr->sadb_msg_pid = 0;
2582
2583         /* SA */
2584         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2585         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2586         sa->sadb_sa_exttype = SADB_EXT_SA;
2587         sa->sadb_sa_spi = x->id.spi;
2588         sa->sadb_sa_replay = 0;
2589         sa->sadb_sa_state = 0;
2590         sa->sadb_sa_auth = 0;
2591         sa->sadb_sa_encrypt = 0;
2592         sa->sadb_sa_flags = 0;
2593
2594         /* ADDRESS_SRC (old addr) */
2595         addr = (struct sadb_address*)
2596                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2597         addr->sadb_address_len =
2598                 (sizeof(struct sadb_address)+sockaddr_size)/
2599                         sizeof(uint64_t);
2600         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2601         addr->sadb_address_proto = 0;
2602         addr->sadb_address_reserved = 0;
2603         if (x->props.family == AF_INET) {
2604                 addr->sadb_address_prefixlen = 32;
2605
2606                 sin = (struct sockaddr_in *) (addr + 1);
2607                 sin->sin_family = AF_INET;
2608                 sin->sin_addr.s_addr = x->props.saddr.a4;
2609                 sin->sin_port = 0;
2610                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2611         }
2612 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2613         else if (x->props.family == AF_INET6) {
2614                 addr->sadb_address_prefixlen = 128;
2615
2616                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2617                 sin6->sin6_family = AF_INET6;
2618                 sin6->sin6_port = 0;
2619                 sin6->sin6_flowinfo = 0;
2620                 memcpy(&sin6->sin6_addr,
2621                        x->props.saddr.a6, sizeof(struct in6_addr));
2622                 sin6->sin6_scope_id = 0;
2623         }
2624 #endif
2625         else
2626                 BUG();
2627
2628         /* NAT_T_SPORT (old port) */
2629         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2630         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2631         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2632         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2633         n_port->sadb_x_nat_t_port_reserved = 0;
2634
2635         /* ADDRESS_DST (new addr) */
2636         addr = (struct sadb_address*)
2637                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2638         addr->sadb_address_len =
2639                 (sizeof(struct sadb_address)+sockaddr_size)/
2640                         sizeof(uint64_t);
2641         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2642         addr->sadb_address_proto = 0;
2643         addr->sadb_address_reserved = 0;
2644         if (x->props.family == AF_INET) {
2645                 addr->sadb_address_prefixlen = 32;
2646
2647                 sin = (struct sockaddr_in *) (addr + 1);
2648                 sin->sin_family = AF_INET;
2649                 sin->sin_addr.s_addr = ipaddr->a4;
2650                 sin->sin_port = 0;
2651                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2652         }
2653 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2654         else if (x->props.family == AF_INET6) {
2655                 addr->sadb_address_prefixlen = 128;
2656
2657                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2658                 sin6->sin6_family = AF_INET6;
2659                 sin6->sin6_port = 0;
2660                 sin6->sin6_flowinfo = 0;
2661                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2662                 sin6->sin6_scope_id = 0;
2663         }
2664 #endif
2665         else
2666                 BUG();
2667
2668         /* NAT_T_DPORT (new port) */
2669         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2670         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2671         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2672         n_port->sadb_x_nat_t_port_port = sport;
2673         n_port->sadb_x_nat_t_port_reserved = 0;
2674
2675         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2676 }
2677
2678 static int pfkey_sendmsg(struct kiocb *kiocb,
2679                          struct socket *sock, struct msghdr *msg, size_t len)
2680 {
2681         struct sock *sk = sock->sk;
2682         struct sk_buff *skb = NULL;
2683         struct sadb_msg *hdr = NULL;
2684         int err;
2685
2686         err = -EOPNOTSUPP;
2687         if (msg->msg_flags & MSG_OOB)
2688                 goto out;
2689
2690         err = -EMSGSIZE;
2691         if ((unsigned)len > sk->sk_sndbuf - 32)
2692                 goto out;
2693
2694         err = -ENOBUFS;
2695         skb = alloc_skb(len, GFP_KERNEL);
2696         if (skb == NULL)
2697                 goto out;
2698
2699         err = -EFAULT;
2700         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2701                 goto out;
2702
2703         hdr = pfkey_get_base_msg(skb, &err);
2704         if (!hdr)
2705                 goto out;
2706
2707         down(&xfrm_cfg_sem);
2708         err = pfkey_process(sk, skb, hdr);
2709         up(&xfrm_cfg_sem);
2710
2711 out:
2712         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2713                 err = 0;
2714         if (skb)
2715                 kfree_skb(skb);
2716
2717         return err ? : len;
2718 }
2719
2720 static int pfkey_recvmsg(struct kiocb *kiocb,
2721                          struct socket *sock, struct msghdr *msg, size_t len,
2722                          int flags)
2723 {
2724         struct sock *sk = sock->sk;
2725         struct sk_buff *skb;
2726         int copied, err;
2727
2728         err = -EINVAL;
2729         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2730                 goto out;
2731
2732         msg->msg_namelen = 0;
2733         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2734         if (skb == NULL)
2735                 goto out;
2736
2737         copied = skb->len;
2738         if (copied > len) {
2739                 msg->msg_flags |= MSG_TRUNC;
2740                 copied = len;
2741         }
2742
2743         skb->h.raw = skb->data;
2744         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2745         if (err)
2746                 goto out_free;
2747
2748         sock_recv_timestamp(msg, sk, skb);
2749
2750         err = (flags & MSG_TRUNC) ? skb->len : copied;
2751
2752 out_free:
2753         skb_free_datagram(sk, skb);
2754 out:
2755         return err;
2756 }
2757
2758 static struct proto_ops pfkey_ops = {
2759         .family         =       PF_KEY,
2760         .owner          =       THIS_MODULE,
2761         /* Operations that make no sense on pfkey sockets. */
2762         .bind           =       sock_no_bind,
2763         .connect        =       sock_no_connect,
2764         .socketpair     =       sock_no_socketpair,
2765         .accept         =       sock_no_accept,
2766         .getname        =       sock_no_getname,
2767         .ioctl          =       sock_no_ioctl,
2768         .listen         =       sock_no_listen,
2769         .shutdown       =       sock_no_shutdown,
2770         .setsockopt     =       sock_no_setsockopt,
2771         .getsockopt     =       sock_no_getsockopt,
2772         .mmap           =       sock_no_mmap,
2773         .sendpage       =       sock_no_sendpage,
2774
2775         /* Now the operations that really occur. */
2776         .release        =       pfkey_release,
2777         .poll           =       datagram_poll,
2778         .sendmsg        =       pfkey_sendmsg,
2779         .recvmsg        =       pfkey_recvmsg,
2780 };
2781
2782 static struct net_proto_family pfkey_family_ops = {
2783         .family =       PF_KEY,
2784         .create =       pfkey_create,
2785         .owner  =       THIS_MODULE,
2786 };
2787
2788 #ifdef CONFIG_PROC_FS
2789 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2790                            int length, int *eof, void *data)
2791 {
2792         off_t pos = 0;
2793         off_t begin = 0;
2794         int len = 0;
2795         struct sock *s;
2796         struct hlist_node *node;
2797
2798         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
2799
2800         read_lock(&pfkey_table_lock);
2801
2802         sk_for_each(s, node, &pfkey_table) {
2803                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2804                                s,
2805                                atomic_read(&s->sk_refcnt),
2806                                atomic_read(&s->sk_rmem_alloc),
2807                                atomic_read(&s->sk_wmem_alloc),
2808                                sock_i_uid(s),
2809                                sock_i_ino(s)
2810                                );
2811
2812                 buffer[len++] = '\n';
2813
2814                 pos = begin + len;
2815                 if (pos < offset) {
2816                         len = 0;
2817                         begin = pos;
2818                 }
2819                 if(pos > offset + length)
2820                         goto done;
2821         }
2822         *eof = 1;
2823
2824 done:
2825         read_unlock(&pfkey_table_lock);
2826
2827         *start = buffer + (offset - begin);
2828         len -= (offset - begin);
2829
2830         if (len > length)
2831                 len = length;
2832         if (len < 0)
2833                 len = 0;
2834
2835         return len;
2836 }
2837 #endif
2838
2839 static struct xfrm_mgr pfkeyv2_mgr =
2840 {
2841         .id             = "pfkeyv2",
2842         .notify         = pfkey_send_notify,
2843         .acquire        = pfkey_send_acquire,
2844         .compile_policy = pfkey_compile_policy,
2845         .new_mapping    = pfkey_send_new_mapping,
2846 };
2847
2848 static void __exit ipsec_pfkey_exit(void)
2849 {
2850         xfrm_unregister_km(&pfkeyv2_mgr);
2851         remove_proc_entry("net/pfkey", 0);
2852         sock_unregister(PF_KEY);
2853 }
2854
2855 static int __init ipsec_pfkey_init(void)
2856 {
2857         sock_register(&pfkey_family_ops);
2858 #ifdef CONFIG_PROC_FS
2859         create_proc_read_entry("net/pfkey", 0, 0, pfkey_read_proc, NULL);
2860 #endif
2861         xfrm_register_km(&pfkeyv2_mgr);
2862         return 0;
2863 }
2864
2865 module_init(ipsec_pfkey_init);
2866 module_exit(ipsec_pfkey_exit);
2867 MODULE_LICENSE("GPL");
2868 MODULE_ALIAS_NETPROTO(PF_KEY);