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 static HLIST_HEAD(pfkey_table);
  39 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  40 static DEFINE_RWLOCK(pfkey_table_lock);
  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_sock {
  46         /* struct sock must be the first member of struct pfkey_sock */
  47         struct sock     sk;
  48         int             registered;
  49         int             promisc;
  50 };
  51
  52 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  53 {
  54         return (struct pfkey_sock *)sk;
  55 }
  56
  57 static void pfkey_sock_destruct(struct sock *sk)
  58 {
  59         skb_queue_purge(&sk->sk_receive_queue);
  60
  61         if (!sock_flag(sk, SOCK_DEAD)) {
  62                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  63                 return;
  64         }
  65
  66         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
  67         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
  68
  69         atomic_dec(&pfkey_socks_nr);
  70 }
  71
  72 static void pfkey_table_grab(void)
  73 {
  74         write_lock_bh(&pfkey_table_lock);
  75
  76         if (atomic_read(&pfkey_table_users)) {
  77                 DECLARE_WAITQUEUE(wait, current);
  78
  79                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
  80                 for(;;) {
  81                         set_current_state(TASK_UNINTERRUPTIBLE);
  82                         if (atomic_read(&pfkey_table_users) == 0)
  83                                 break;
  84                         write_unlock_bh(&pfkey_table_lock);
  85                         schedule();
  86                         write_lock_bh(&pfkey_table_lock);
  87                 }
  88
  89                 __set_current_state(TASK_RUNNING);
  90                 remove_wait_queue(&pfkey_table_wait, &wait);
  91         }
  92 }
  93
  94 static __inline__ void pfkey_table_ungrab(void)
  95 {
  96         write_unlock_bh(&pfkey_table_lock);
  97         wake_up(&pfkey_table_wait);
  98 }
  99
 100 static __inline__ void pfkey_lock_table(void)
 101 {
 102         /* read_lock() synchronizes us to pfkey_table_grab */
 103
 104         read_lock(&pfkey_table_lock);
 105         atomic_inc(&pfkey_table_users);
 106         read_unlock(&pfkey_table_lock);
 107 }
 108
 109 static __inline__ void pfkey_unlock_table(void)
 110 {
 111         if (atomic_dec_and_test(&pfkey_table_users))
 112                 wake_up(&pfkey_table_wait);
 113 }
 114
 115
 116 static struct proto_ops pfkey_ops;
 117
 118 static void pfkey_insert(struct sock *sk)
 119 {
 120         pfkey_table_grab();
 121         sk_add_node(sk, &pfkey_table);
 122         pfkey_table_ungrab();
 123 }
 124
 125 static void pfkey_remove(struct sock *sk)
 126 {
 127         pfkey_table_grab();
 128         sk_del_node_init(sk);
 129         pfkey_table_ungrab();
 130 }
 131
 132 static struct proto key_proto = {
 133         .name     = "KEY",
 134         .owner    = THIS_MODULE,
 135         .obj_size = sizeof(struct pfkey_sock),
 136 };
 137
 138 static int pfkey_create(struct socket *sock, int protocol)
 139 {
 140         struct sock *sk;
 141         int err;
 142
 143         if (!capable(CAP_NET_ADMIN))
 144                 return -EPERM;
 145         if (sock->type != SOCK_RAW)
 146                 return -ESOCKTNOSUPPORT;
 147         if (protocol != PF_KEY_V2)
 148                 return -EPROTONOSUPPORT;
 149
 150         err = -ENOMEM;
 151         sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1);
 152         if (sk == NULL)
 153                 goto out;
 154
 155         sock->ops = &pfkey_ops;
 156         sock_init_data(sock, sk);
 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_sock *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                 return 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, 0);
 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, 0);
 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, 0);
 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         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 687                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 688
 689         /* hard time */
 690         if (hsc & 2) {
 691                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 692                                                              sizeof(struct sadb_lifetime));
 693                 lifetime->sadb_lifetime_len =
 694                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 695                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 696                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 697                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 698                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 699                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 700         }
 701         /* soft time */
 702         if (hsc & 1) {
 703                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 704                                                              sizeof(struct sadb_lifetime));
 705                 lifetime->sadb_lifetime_len =
 706                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 707                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 708                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 709                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 710                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 711                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 712         }
 713         /* current time */
 714         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 715                                                      sizeof(struct sadb_lifetime));
 716         lifetime->sadb_lifetime_len =
 717                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 718         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 719         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 720         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 721         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 722         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 723         /* src address */
 724         addr = (struct sadb_address*) skb_put(skb,
 725                                               sizeof(struct sadb_address)+sockaddr_size);
 726         addr->sadb_address_len =
 727                 (sizeof(struct sadb_address)+sockaddr_size)/
 728                         sizeof(uint64_t);
 729         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 730         /* "if the ports are non-zero, then the sadb_address_proto field,
 731            normally zero, MUST be filled in with the transport
 732            protocol's number." - RFC2367 */
 733         addr->sadb_address_proto = 0;
 734         addr->sadb_address_reserved = 0;
 735         if (x->props.family == AF_INET) {
 736                 addr->sadb_address_prefixlen = 32;
 737
 738                 sin = (struct sockaddr_in *) (addr + 1);
 739                 sin->sin_family = AF_INET;
 740                 sin->sin_addr.s_addr = x->props.saddr.a4;
 741                 sin->sin_port = 0;
 742                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 743         }
 744 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 745         else if (x->props.family == AF_INET6) {
 746                 addr->sadb_address_prefixlen = 128;
 747
 748                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 749                 sin6->sin6_family = AF_INET6;
 750                 sin6->sin6_port = 0;
 751                 sin6->sin6_flowinfo = 0;
 752                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 753                        sizeof(struct in6_addr));
 754                 sin6->sin6_scope_id = 0;
 755         }
 756 #endif
 757         else
 758                 BUG();
 759
 760         /* dst address */
 761         addr = (struct sadb_address*) skb_put(skb,
 762                                               sizeof(struct sadb_address)+sockaddr_size);
 763         addr->sadb_address_len =
 764                 (sizeof(struct sadb_address)+sockaddr_size)/
 765                         sizeof(uint64_t);
 766         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 767         addr->sadb_address_proto = 0;
 768         addr->sadb_address_prefixlen = 32; /* XXX */
 769         addr->sadb_address_reserved = 0;
 770         if (x->props.family == AF_INET) {
 771                 sin = (struct sockaddr_in *) (addr + 1);
 772                 sin->sin_family = AF_INET;
 773                 sin->sin_addr.s_addr = x->id.daddr.a4;
 774                 sin->sin_port = 0;
 775                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 776
 777                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 778                         addr = (struct sadb_address*) skb_put(skb,
 779                                 sizeof(struct sadb_address)+sockaddr_size);
 780                         addr->sadb_address_len =
 781                                 (sizeof(struct sadb_address)+sockaddr_size)/
 782                                 sizeof(uint64_t);
 783                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 784                         addr->sadb_address_proto =
 785                                 pfkey_proto_from_xfrm(x->sel.proto);
 786                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 787                         addr->sadb_address_reserved = 0;
 788
 789                         sin = (struct sockaddr_in *) (addr + 1);
 790                         sin->sin_family = AF_INET;
 791                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 792                         sin->sin_port = x->sel.sport;
 793                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 794                 }
 795         }
 796 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 797         else if (x->props.family == AF_INET6) {
 798                 addr->sadb_address_prefixlen = 128;
 799
 800                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 801                 sin6->sin6_family = AF_INET6;
 802                 sin6->sin6_port = 0;
 803                 sin6->sin6_flowinfo = 0;
 804                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 805                 sin6->sin6_scope_id = 0;
 806
 807                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 808                             sizeof(struct in6_addr))) {
 809                         addr = (struct sadb_address *) skb_put(skb,
 810                                 sizeof(struct sadb_address)+sockaddr_size);
 811                         addr->sadb_address_len =
 812                                 (sizeof(struct sadb_address)+sockaddr_size)/
 813                                 sizeof(uint64_t);
 814                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 815                         addr->sadb_address_proto =
 816                                 pfkey_proto_from_xfrm(x->sel.proto);
 817                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 818                         addr->sadb_address_reserved = 0;
 819
 820                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 821                         sin6->sin6_family = AF_INET6;
 822                         sin6->sin6_port = x->sel.sport;
 823                         sin6->sin6_flowinfo = 0;
 824                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 825                                sizeof(struct in6_addr));
 826                         sin6->sin6_scope_id = 0;
 827                 }
 828         }
 829 #endif
 830         else
 831                 BUG();
 832
 833         /* auth key */
 834         if (add_keys && auth_key_size) {
 835                 key = (struct sadb_key *) skb_put(skb,
 836                                                   sizeof(struct sadb_key)+auth_key_size);
 837                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 838                         sizeof(uint64_t);
 839                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 840                 key->sadb_key_bits = x->aalg->alg_key_len;
 841                 key->sadb_key_reserved = 0;
 842                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 843         }
 844         /* encrypt key */
 845         if (add_keys && encrypt_key_size) {
 846                 key = (struct sadb_key *) skb_put(skb,
 847                                                   sizeof(struct sadb_key)+encrypt_key_size);
 848                 key->sadb_key_len = (sizeof(struct sadb_key) +
 849                                      encrypt_key_size) / sizeof(uint64_t);
 850                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 851                 key->sadb_key_bits = x->ealg->alg_key_len;
 852                 key->sadb_key_reserved = 0;
 853                 memcpy(key + 1, x->ealg->alg_key,
 854                        (x->ealg->alg_key_len+7)/8);
 855         }
 856
 857         /* sa */
 858         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 859         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 860         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 861         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 862         sa2->sadb_x_sa2_reserved1 = 0;
 863         sa2->sadb_x_sa2_reserved2 = 0;
 864         sa2->sadb_x_sa2_sequence = 0;
 865         sa2->sadb_x_sa2_reqid = x->props.reqid;
 866
 867         if (natt && natt->encap_type) {
 868                 struct sadb_x_nat_t_type *n_type;
 869                 struct sadb_x_nat_t_port *n_port;
 870
 871                 /* type */
 872                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 873                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 874                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 875                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 876                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 877                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 878                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 879
 880                 /* source port */
 881                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 882                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 883                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 884                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 885                 n_port->sadb_x_nat_t_port_reserved = 0;
 886
 887                 /* dest port */
 888                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 889                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 890                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 891                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 892                 n_port->sadb_x_nat_t_port_reserved = 0;
 893         }
 894
 895         return skb;
 896 }
 897
 898 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 899                                                 void **ext_hdrs)
 900 {
 901         struct xfrm_state *x;
 902         struct sadb_lifetime *lifetime;
 903         struct sadb_sa *sa;
 904         struct sadb_key *key;
 905         uint16_t proto;
 906         int err;
 907
 908
 909         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 910         if (!sa ||
 911             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 912                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 913                 return ERR_PTR(-EINVAL);
 914         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
 915             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
 916                 return ERR_PTR(-EINVAL);
 917         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
 918             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
 919                 return ERR_PTR(-EINVAL);
 920         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
 921             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
 922                 return ERR_PTR(-EINVAL);
 923
 924         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 925         if (proto == 0)
 926                 return ERR_PTR(-EINVAL);
 927
 928         /* default error is no buffer space */
 929         err = -ENOBUFS;
 930
 931         /* RFC2367:
 932
 933    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
 934    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
 935    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
 936    Therefore, the sadb_sa_state field of all submitted SAs MUST be
 937    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
 938    not true.
 939
 940            However, KAME setkey always uses SADB_SASTATE_LARVAL.
 941            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
 942          */
 943         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
 944             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
 945              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
 946             sa->sadb_sa_encrypt > SADB_EALG_MAX)
 947                 return ERR_PTR(-EINVAL);
 948         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 949         if (key != NULL &&
 950             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
 951             ((key->sadb_key_bits+7) / 8 == 0 ||
 952              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 953                 return ERR_PTR(-EINVAL);
 954         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
 955         if (key != NULL &&
 956             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
 957             ((key->sadb_key_bits+7) / 8 == 0 ||
 958              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 959                 return ERR_PTR(-EINVAL);
 960
 961         x = xfrm_state_alloc();
 962         if (x == NULL)
 963                 return ERR_PTR(-ENOBUFS);
 964
 965         x->id.proto = proto;
 966         x->id.spi = sa->sadb_sa_spi;
 967         x->props.replay_window = sa->sadb_sa_replay;
 968         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
 969                 x->props.flags |= XFRM_STATE_NOECN;
 970         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
 971                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
 972
 973         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
 974         if (lifetime != NULL) {
 975                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 976                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 977                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 978                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 979         }
 980         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
 981         if (lifetime != NULL) {
 982                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 983                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 984                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 985                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 986         }
 987         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 988         if (sa->sadb_sa_auth) {
 989                 int keysize = 0;
 990                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
 991                 if (!a) {
 992                         err = -ENOSYS;
 993                         goto out;
 994                 }
 995                 if (key)
 996                         keysize = (key->sadb_key_bits + 7) / 8;
 997                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
 998                 if (!x->aalg)
 999                         goto out;
1000                 strcpy(x->aalg->alg_name, a->name);
1001                 x->aalg->alg_key_len = 0;
1002                 if (key) {
1003                         x->aalg->alg_key_len = key->sadb_key_bits;
1004                         memcpy(x->aalg->alg_key, key+1, keysize);
1005                 }
1006                 x->props.aalgo = sa->sadb_sa_auth;
1007                 /* x->algo.flags = sa->sadb_sa_flags; */
1008         }
1009         if (sa->sadb_sa_encrypt) {
1010                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1011                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1012                         if (!a) {
1013                                 err = -ENOSYS;
1014                                 goto out;
1015                         }
1016                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1017                         if (!x->calg)
1018                                 goto out;
1019                         strcpy(x->calg->alg_name, a->name);
1020                         x->props.calgo = sa->sadb_sa_encrypt;
1021                 } else {
1022                         int keysize = 0;
1023                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1024                         if (!a) {
1025                                 err = -ENOSYS;
1026                                 goto out;
1027                         }
1028                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1029                         if (key)
1030                                 keysize = (key->sadb_key_bits + 7) / 8;
1031                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1032                         if (!x->ealg)
1033                                 goto out;
1034                         strcpy(x->ealg->alg_name, a->name);
1035                         x->ealg->alg_key_len = 0;
1036                         if (key) {
1037                                 x->ealg->alg_key_len = key->sadb_key_bits;
1038                                 memcpy(x->ealg->alg_key, key+1, keysize);
1039                         }
1040                         x->props.ealgo = sa->sadb_sa_encrypt;
1041                 }
1042         }
1043         /* x->algo.flags = sa->sadb_sa_flags; */
1044
1045         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046                                                     &x->props.saddr);
1047         if (!x->props.family) {
1048                 err = -EAFNOSUPPORT;
1049                 goto out;
1050         }
1051         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1052                                   &x->id.daddr);
1053
1054         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1055                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1056                 x->props.mode = sa2->sadb_x_sa2_mode;
1057                 if (x->props.mode)
1058                         x->props.mode--;
1059                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1060         }
1061
1062         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1063                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1064
1065                 /* Nobody uses this, but we try. */
1066                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1067                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1068         }
1069
1070         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1071                 struct sadb_x_nat_t_type* n_type;
1072                 struct xfrm_encap_tmpl *natt;
1073
1074                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1075                 if (!x->encap)
1076                         goto out;
1077
1078                 natt = x->encap;
1079                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1080                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1081
1082                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1083                         struct sadb_x_nat_t_port* n_port =
1084                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1085                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1086                 }
1087                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1088                         struct sadb_x_nat_t_port* n_port =
1089                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1090                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1091                 }
1092         }
1093
1094         x->type = xfrm_get_type(proto, x->props.family);
1095         if (x->type == NULL) {
1096                 err = -ENOPROTOOPT;
1097                 goto out;
1098         }
1099         if (x->type->init_state(x, NULL)) {
1100                 err = -EINVAL;
1101                 goto out;
1102         }
1103         x->km.seq = hdr->sadb_msg_seq;
1104         x->km.state = XFRM_STATE_VALID;
1105         return x;
1106
1107 out:
1108         x->km.state = XFRM_STATE_DEAD;
1109         xfrm_state_put(x);
1110         return ERR_PTR(err);
1111 }
1112
1113 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1114 {
1115         return -EOPNOTSUPP;
1116 }
1117
1118 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1119 {
1120         struct sk_buff *resp_skb;
1121         struct sadb_x_sa2 *sa2;
1122         struct sadb_address *saddr, *daddr;
1123         struct sadb_msg *out_hdr;
1124         struct xfrm_state *x = NULL;
1125         u8 mode;
1126         u32 reqid;
1127         u8 proto;
1128         unsigned short family;
1129         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1130
1131         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1132                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1133                 return -EINVAL;
1134
1135         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1136         if (proto == 0)
1137                 return -EINVAL;
1138
1139         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1140                 mode = sa2->sadb_x_sa2_mode - 1;
1141                 reqid = sa2->sadb_x_sa2_reqid;
1142         } else {
1143                 mode = 0;
1144                 reqid = 0;
1145         }
1146
1147         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1148         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1149
1150         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1151         switch (family) {
1152         case AF_INET:
1153                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1154                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1155                 break;
1156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1157         case AF_INET6:
1158                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1159                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1160                 break;
1161 #endif
1162         }
1163
1164         if (hdr->sadb_msg_seq) {
1165                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1166                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1167                         xfrm_state_put(x);
1168                         x = NULL;
1169                 }
1170         }
1171
1172         if (!x)
1173                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1174
1175         if (x == NULL)
1176                 return -ENOENT;
1177
1178         resp_skb = ERR_PTR(-ENOENT);
1179
1180         spin_lock_bh(&x->lock);
1181         if (x->km.state != XFRM_STATE_DEAD) {
1182                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1183                 u32 min_spi, max_spi;
1184
1185                 if (range != NULL) {
1186                         min_spi = range->sadb_spirange_min;
1187                         max_spi = range->sadb_spirange_max;
1188                 } else {
1189                         min_spi = 0x100;
1190                         max_spi = 0x0fffffff;
1191                 }
1192                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1193                 if (x->id.spi)
1194                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1195         }
1196         spin_unlock_bh(&x->lock);
1197
1198         if (IS_ERR(resp_skb)) {
1199                 xfrm_state_put(x);
1200                 return  PTR_ERR(resp_skb);
1201         }
1202
1203         out_hdr = (struct sadb_msg *) resp_skb->data;
1204         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1205         out_hdr->sadb_msg_type = SADB_GETSPI;
1206         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1207         out_hdr->sadb_msg_errno = 0;
1208         out_hdr->sadb_msg_reserved = 0;
1209         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1210         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1211
1212         xfrm_state_put(x);
1213
1214         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1215
1216         return 0;
1217 }
1218
1219 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1220 {
1221         struct xfrm_state *x;
1222
1223         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1224                 return -EOPNOTSUPP;
1225
1226         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1227                 return 0;
1228
1229         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1230         if (x == NULL)
1231                 return 0;
1232
1233         spin_lock_bh(&x->lock);
1234         if (x->km.state == XFRM_STATE_ACQ) {
1235                 x->km.state = XFRM_STATE_ERROR;
1236                 wake_up(&km_waitq);
1237         }
1238         spin_unlock_bh(&x->lock);
1239         xfrm_state_put(x);
1240         return 0;
1241 }
1242
1243
1244 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1245 {
1246         struct sk_buff *out_skb;
1247         struct sadb_msg *out_hdr;
1248         struct xfrm_state *x;
1249         int err;
1250
1251         xfrm_probe_algs();
1252
1253         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1254         if (IS_ERR(x))
1255                 return PTR_ERR(x);
1256
1257         if (hdr->sadb_msg_type == SADB_ADD)
1258                 err = xfrm_state_add(x);
1259         else
1260                 err = xfrm_state_update(x);
1261
1262         if (err < 0) {
1263                 x->km.state = XFRM_STATE_DEAD;
1264                 xfrm_state_put(x);
1265                 return err;
1266         }
1267
1268         out_skb = pfkey_xfrm_state2msg(x, 0, 3);
1269         if (IS_ERR(out_skb))
1270                 return  PTR_ERR(out_skb); /* XXX Should we return 0 here ? */
1271
1272         out_hdr = (struct sadb_msg *) out_skb->data;
1273         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1274         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1275         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1276         out_hdr->sadb_msg_errno = 0;
1277         out_hdr->sadb_msg_reserved = 0;
1278         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1279         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1280
1281         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1282
1283         return 0;
1284 }
1285
1286 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1287 {
1288         struct xfrm_state *x;
1289
1290         if (!ext_hdrs[SADB_EXT_SA-1] ||
1291             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1292                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1293                 return -EINVAL;
1294
1295         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1296         if (x == NULL)
1297                 return -ESRCH;
1298
1299         if (xfrm_state_kern(x)) {
1300                 xfrm_state_put(x);
1301                 return -EPERM;
1302         }
1303
1304         xfrm_state_delete(x);
1305         xfrm_state_put(x);
1306
1307         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
1308                         BROADCAST_ALL, sk);
1309
1310         return 0;
1311 }
1312
1313 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1314 {
1315         __u8 proto;
1316         struct sk_buff *out_skb;
1317         struct sadb_msg *out_hdr;
1318         struct xfrm_state *x;
1319
1320         if (!ext_hdrs[SADB_EXT_SA-1] ||
1321             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1322                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1323                 return -EINVAL;
1324
1325         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1326         if (x == NULL)
1327                 return -ESRCH;
1328
1329         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1330         proto = x->id.proto;
1331         xfrm_state_put(x);
1332         if (IS_ERR(out_skb))
1333                 return  PTR_ERR(out_skb);
1334
1335         out_hdr = (struct sadb_msg *) out_skb->data;
1336         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1337         out_hdr->sadb_msg_type = SADB_DUMP;
1338         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1339         out_hdr->sadb_msg_errno = 0;
1340         out_hdr->sadb_msg_reserved = 0;
1341         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1342         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1343         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1344
1345         return 0;
1346 }
1347
1348 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1349 {
1350         struct sk_buff *skb;
1351         struct sadb_msg *hdr;
1352         int len, auth_len, enc_len, i;
1353
1354         auth_len = xfrm_count_auth_supported();
1355         if (auth_len) {
1356                 auth_len *= sizeof(struct sadb_alg);
1357                 auth_len += sizeof(struct sadb_supported);
1358         }
1359
1360         enc_len = xfrm_count_enc_supported();
1361         if (enc_len) {
1362                 enc_len *= sizeof(struct sadb_alg);
1363                 enc_len += sizeof(struct sadb_supported);
1364         }
1365
1366         len = enc_len + auth_len + sizeof(struct sadb_msg);
1367
1368         skb = alloc_skb(len + 16, allocation);
1369         if (!skb)
1370                 goto out_put_algs;
1371
1372         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1373         pfkey_hdr_dup(hdr, orig);
1374         hdr->sadb_msg_errno = 0;
1375         hdr->sadb_msg_len = len / sizeof(uint64_t);
1376
1377         if (auth_len) {
1378                 struct sadb_supported *sp;
1379                 struct sadb_alg *ap;
1380
1381                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1382                 ap = (struct sadb_alg *) (sp + 1);
1383
1384                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1385                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1386
1387                 for (i = 0; ; i++) {
1388                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1389                         if (!aalg)
1390                                 break;
1391                         if (aalg->available)
1392                                 *ap++ = aalg->desc;
1393                 }
1394         }
1395
1396         if (enc_len) {
1397                 struct sadb_supported *sp;
1398                 struct sadb_alg *ap;
1399
1400                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1401                 ap = (struct sadb_alg *) (sp + 1);
1402
1403                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1404                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1405
1406                 for (i = 0; ; i++) {
1407                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1408                         if (!ealg)
1409                                 break;
1410                         if (ealg->available)
1411                                 *ap++ = ealg->desc;
1412                 }
1413         }
1414
1415 out_put_algs:
1416         return skb;
1417 }
1418
1419 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1420 {
1421         struct pfkey_sock *pfk = pfkey_sk(sk);
1422         struct sk_buff *supp_skb;
1423
1424         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1425                 return -EINVAL;
1426
1427         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1428                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1429                         return -EEXIST;
1430                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1431         }
1432
1433         xfrm_probe_algs();
1434
1435         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1436         if (!supp_skb) {
1437                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1438                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1439
1440                 return -ENOBUFS;
1441         }
1442
1443         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1444
1445         return 0;
1446 }
1447
1448 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1449 {
1450         unsigned proto;
1451         struct sk_buff *skb_out;
1452         struct sadb_msg *hdr_out;
1453
1454         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1455         if (proto == 0)
1456                 return -EINVAL;
1457
1458         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
1459         if (!skb_out)
1460                 return -ENOBUFS;
1461
1462         xfrm_state_flush(proto);
1463
1464         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
1465         pfkey_hdr_dup(hdr_out, hdr);
1466         hdr_out->sadb_msg_errno = (uint8_t) 0;
1467         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1468
1469         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
1470
1471         return 0;
1472 }
1473
1474 struct pfkey_dump_data
1475 {
1476         struct sk_buff *skb;
1477         struct sadb_msg *hdr;
1478         struct sock *sk;
1479 };
1480
1481 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1482 {
1483         struct pfkey_dump_data *data = ptr;
1484         struct sk_buff *out_skb;
1485         struct sadb_msg *out_hdr;
1486
1487         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1488         if (IS_ERR(out_skb))
1489                 return PTR_ERR(out_skb);
1490
1491         out_hdr = (struct sadb_msg *) out_skb->data;
1492         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1493         out_hdr->sadb_msg_type = SADB_DUMP;
1494         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1495         out_hdr->sadb_msg_errno = 0;
1496         out_hdr->sadb_msg_reserved = 0;
1497         out_hdr->sadb_msg_seq = count;
1498         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1499         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1500         return 0;
1501 }
1502
1503 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1504 {
1505         u8 proto;
1506         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1507
1508         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1509         if (proto == 0)
1510                 return -EINVAL;
1511
1512         return xfrm_state_walk(proto, dump_sa, &data);
1513 }
1514
1515 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1516 {
1517         struct pfkey_sock *pfk = pfkey_sk(sk);
1518         int satype = hdr->sadb_msg_satype;
1519
1520         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1521                 /* XXX we mangle packet... */
1522                 hdr->sadb_msg_errno = 0;
1523                 if (satype != 0 && satype != 1)
1524                         return -EINVAL;
1525                 pfk->promisc = satype;
1526         }
1527         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1528         return 0;
1529 }
1530
1531 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1532 {
1533         int i;
1534         u32 reqid = *(u32*)ptr;
1535
1536         for (i=0; i<xp->xfrm_nr; i++) {
1537                 if (xp->xfrm_vec[i].reqid == reqid)
1538                         return -EEXIST;
1539         }
1540         return 0;
1541 }
1542
1543 static u32 gen_reqid(void)
1544 {
1545         u32 start;
1546         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1547
1548         start = reqid;
1549         do {
1550                 ++reqid;
1551                 if (reqid == 0)
1552                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1553                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1554                         return reqid;
1555         } while (reqid != start);
1556         return 0;
1557 }
1558
1559 static int
1560 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1561 {
1562         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1563         struct sockaddr_in *sin;
1564 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1565         struct sockaddr_in6 *sin6;
1566 #endif
1567
1568         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1569                 return -ELOOP;
1570
1571         if (rq->sadb_x_ipsecrequest_mode == 0)
1572                 return -EINVAL;
1573
1574         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1575         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1576         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1577                 t->optional = 1;
1578         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1579                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1580                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1581                         t->reqid = 0;
1582                 if (!t->reqid && !(t->reqid = gen_reqid()))
1583                         return -ENOBUFS;
1584         }
1585
1586         /* addresses present only in tunnel mode */
1587         if (t->mode) {
1588                 switch (xp->family) {
1589                 case AF_INET:
1590                         sin = (void*)(rq+1);
1591                         if (sin->sin_family != AF_INET)
1592                                 return -EINVAL;
1593                         t->saddr.a4 = sin->sin_addr.s_addr;
1594                         sin++;
1595                         if (sin->sin_family != AF_INET)
1596                                 return -EINVAL;
1597                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1598                         break;
1599 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1600                 case AF_INET6:
1601                         sin6 = (void *)(rq+1);
1602                         if (sin6->sin6_family != AF_INET6)
1603                                 return -EINVAL;
1604                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1605                         sin6++;
1606                         if (sin6->sin6_family != AF_INET6)
1607                                 return -EINVAL;
1608                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1609                         break;
1610 #endif
1611                 default:
1612                         return -EINVAL;
1613                 }
1614         }
1615         /* No way to set this via kame pfkey */
1616         t->aalgos = t->ealgos = t->calgos = ~0;
1617         xp->xfrm_nr++;
1618         return 0;
1619 }
1620
1621 static int
1622 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1623 {
1624         int err;
1625         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1626         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1627
1628         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1629                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1630                         return err;
1631                 len -= rq->sadb_x_ipsecrequest_len;
1632                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1633         }
1634         return 0;
1635 }
1636
1637 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1638 {
1639         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1640         int socklen = (xp->family == AF_INET ?
1641                        sizeof(struct sockaddr_in) :
1642                        sizeof(struct sockaddr_in6));
1643
1644         return sizeof(struct sadb_msg) +
1645                 (sizeof(struct sadb_lifetime) * 3) +
1646                 (sizeof(struct sadb_address) * 2) +
1647                 (sockaddr_size * 2) +
1648                 sizeof(struct sadb_x_policy) +
1649                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1650                                 (socklen * 2)));
1651 }
1652
1653 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1654 {
1655         struct sk_buff *skb;
1656         int size;
1657
1658         size = pfkey_xfrm_policy2msg_size(xp);
1659
1660         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1661         if (skb == NULL)
1662                 return ERR_PTR(-ENOBUFS);
1663
1664         return skb;
1665 }
1666
1667 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1668 {
1669         struct sadb_msg *hdr;
1670         struct sadb_address *addr;
1671         struct sadb_lifetime *lifetime;
1672         struct sadb_x_policy *pol;
1673         struct sockaddr_in   *sin;
1674 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1675         struct sockaddr_in6  *sin6;
1676 #endif
1677         int i;
1678         int size;
1679         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1680         int socklen = (xp->family == AF_INET ?
1681                        sizeof(struct sockaddr_in) :
1682                        sizeof(struct sockaddr_in6));
1683
1684         size = pfkey_xfrm_policy2msg_size(xp);
1685
1686         /* call should fill header later */
1687         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1688         memset(hdr, 0, size);   /* XXX do we need this ? */
1689
1690         /* src address */
1691         addr = (struct sadb_address*) skb_put(skb,
1692                                               sizeof(struct sadb_address)+sockaddr_size);
1693         addr->sadb_address_len =
1694                 (sizeof(struct sadb_address)+sockaddr_size)/
1695                         sizeof(uint64_t);
1696         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1697         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1698         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1699         addr->sadb_address_reserved = 0;
1700         /* src address */
1701         if (xp->family == AF_INET) {
1702                 sin = (struct sockaddr_in *) (addr + 1);
1703                 sin->sin_family = AF_INET;
1704                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1705                 sin->sin_port = xp->selector.sport;
1706                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1707         }
1708 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1709         else if (xp->family == AF_INET6) {
1710                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1711                 sin6->sin6_family = AF_INET6;
1712                 sin6->sin6_port = xp->selector.sport;
1713                 sin6->sin6_flowinfo = 0;
1714                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1715                        sizeof(struct in6_addr));
1716                 sin6->sin6_scope_id = 0;
1717         }
1718 #endif
1719         else
1720                 BUG();
1721
1722         /* dst address */
1723         addr = (struct sadb_address*) skb_put(skb,
1724                                               sizeof(struct sadb_address)+sockaddr_size);
1725         addr->sadb_address_len =
1726                 (sizeof(struct sadb_address)+sockaddr_size)/
1727                         sizeof(uint64_t);
1728         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1729         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1730         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1731         addr->sadb_address_reserved = 0;
1732         if (xp->family == AF_INET) {
1733                 sin = (struct sockaddr_in *) (addr + 1);
1734                 sin->sin_family = AF_INET;
1735                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1736                 sin->sin_port = xp->selector.dport;
1737                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1738         }
1739 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1740         else if (xp->family == AF_INET6) {
1741                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1742                 sin6->sin6_family = AF_INET6;
1743                 sin6->sin6_port = xp->selector.dport;
1744                 sin6->sin6_flowinfo = 0;
1745                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1746                        sizeof(struct in6_addr));
1747                 sin6->sin6_scope_id = 0;
1748         }
1749 #endif
1750         else
1751                 BUG();
1752
1753         /* hard time */
1754         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1755                                                      sizeof(struct sadb_lifetime));
1756         lifetime->sadb_lifetime_len =
1757                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1758         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1759         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1760         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1761         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1762         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1763         /* soft time */
1764         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1765                                                      sizeof(struct sadb_lifetime));
1766         lifetime->sadb_lifetime_len =
1767                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1768         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1769         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1770         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1771         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1772         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1773         /* current time */
1774         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1775                                                      sizeof(struct sadb_lifetime));
1776         lifetime->sadb_lifetime_len =
1777                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1778         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1779         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1780         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1781         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1782         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1783
1784         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1785         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1786         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1787         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1788         if (xp->action == XFRM_POLICY_ALLOW) {
1789                 if (xp->xfrm_nr)
1790                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1791                 else
1792                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1793         }
1794         pol->sadb_x_policy_dir = dir+1;
1795         pol->sadb_x_policy_id = xp->index;
1796         pol->sadb_x_policy_priority = xp->priority;
1797
1798         for (i=0; i<xp->xfrm_nr; i++) {
1799                 struct sadb_x_ipsecrequest *rq;
1800                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1801                 int req_size;
1802
1803                 req_size = sizeof(struct sadb_x_ipsecrequest);
1804                 if (t->mode)
1805                         req_size += 2*socklen;
1806                 else
1807                         size -= 2*socklen;
1808                 rq = (void*)skb_put(skb, req_size);
1809                 pol->sadb_x_policy_len += req_size/8;
1810                 memset(rq, 0, sizeof(*rq));
1811                 rq->sadb_x_ipsecrequest_len = req_size;
1812                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1813                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1814                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1815                 if (t->reqid)
1816                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1817                 if (t->optional)
1818                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1819                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1820                 if (t->mode) {
1821                         switch (xp->family) {
1822                         case AF_INET:
1823                                 sin = (void*)(rq+1);
1824                                 sin->sin_family = AF_INET;
1825                                 sin->sin_addr.s_addr = t->saddr.a4;
1826                                 sin->sin_port = 0;
1827                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1828                                 sin++;
1829                                 sin->sin_family = AF_INET;
1830                                 sin->sin_addr.s_addr = t->id.daddr.a4;
1831                                 sin->sin_port = 0;
1832                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1833                                 break;
1834 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1835                         case AF_INET6:
1836                                 sin6 = (void*)(rq+1);
1837                                 sin6->sin6_family = AF_INET6;
1838                                 sin6->sin6_port = 0;
1839                                 sin6->sin6_flowinfo = 0;
1840                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
1841                                        sizeof(struct in6_addr));
1842                                 sin6->sin6_scope_id = 0;
1843
1844                                 sin6++;
1845                                 sin6->sin6_family = AF_INET6;
1846                                 sin6->sin6_port = 0;
1847                                 sin6->sin6_flowinfo = 0;
1848                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1849                                        sizeof(struct in6_addr));
1850                                 sin6->sin6_scope_id = 0;
1851                                 break;
1852 #endif
1853                         default:
1854                                 break;
1855                         }
1856                 }
1857         }
1858         hdr->sadb_msg_len = size / sizeof(uint64_t);
1859         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1860 }
1861
1862 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1863 {
1864         int err;
1865         struct sadb_lifetime *lifetime;
1866         struct sadb_address *sa;
1867         struct sadb_x_policy *pol;
1868         struct xfrm_policy *xp;
1869         struct sk_buff *out_skb;
1870         struct sadb_msg *out_hdr;
1871
1872         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1873                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1874             !ext_hdrs[SADB_X_EXT_POLICY-1])
1875                 return -EINVAL;
1876
1877         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1878         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1879                 return -EINVAL;
1880         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1881                 return -EINVAL;
1882
1883         xp = xfrm_policy_alloc(GFP_KERNEL);
1884         if (xp == NULL)
1885                 return -ENOBUFS;
1886
1887         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
1888                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
1889         xp->priority = pol->sadb_x_policy_priority;
1890
1891         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1892         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
1893         if (!xp->family) {
1894                 err = -EINVAL;
1895                 goto out;
1896         }
1897         xp->selector.family = xp->family;
1898         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
1899         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1900         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1901         if (xp->selector.sport)
1902                 xp->selector.sport_mask = ~0;
1903
1904         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1905         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
1906         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
1907
1908         /* Amusing, we set this twice.  KAME apps appear to set same value
1909          * in both addresses.
1910          */
1911         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1912
1913         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
1914         if (xp->selector.dport)
1915                 xp->selector.dport_mask = ~0;
1916
1917         xp->lft.soft_byte_limit = XFRM_INF;
1918         xp->lft.hard_byte_limit = XFRM_INF;
1919         xp->lft.soft_packet_limit = XFRM_INF;
1920         xp->lft.hard_packet_limit = XFRM_INF;
1921         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
1922                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1923                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1924                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1925                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1926         }
1927         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
1928                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1929                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1930                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1931                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1932         }
1933         xp->xfrm_nr = 0;
1934         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
1935             (err = parse_ipsecrequests(xp, pol)) < 0)
1936                 goto out;
1937
1938         out_skb = pfkey_xfrm_policy2msg_prep(xp);
1939         if (IS_ERR(out_skb)) {
1940                 err =  PTR_ERR(out_skb);
1941                 goto out;
1942         }
1943
1944         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
1945                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
1946         if (err) {
1947                 kfree_skb(out_skb);
1948                 goto out;
1949         }
1950
1951         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
1952
1953         xfrm_pol_put(xp);
1954
1955         out_hdr = (struct sadb_msg *) out_skb->data;
1956         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1957         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
1958         out_hdr->sadb_msg_satype = 0;
1959         out_hdr->sadb_msg_errno = 0;
1960         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1961         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1962         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
1963         return 0;
1964
1965 out:
1966         kfree(xp);
1967         return err;
1968 }
1969
1970 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1971 {
1972         int err;
1973         struct sadb_address *sa;
1974         struct sadb_x_policy *pol;
1975         struct xfrm_policy *xp;
1976         struct sk_buff *out_skb;
1977         struct sadb_msg *out_hdr;
1978         struct xfrm_selector sel;
1979
1980         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1981                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1982             !ext_hdrs[SADB_X_EXT_POLICY-1])
1983                 return -EINVAL;
1984
1985         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1986         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1987                 return -EINVAL;
1988
1989         memset(&sel, 0, sizeof(sel));
1990
1991         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1992         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
1993         sel.prefixlen_s = sa->sadb_address_prefixlen;
1994         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
1995         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
1996         if (sel.sport)
1997                 sel.sport_mask = ~0;
1998
1999         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2000         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2001         sel.prefixlen_d = sa->sadb_address_prefixlen;
2002         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2003         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2004         if (sel.dport)
2005                 sel.dport_mask = ~0;
2006
2007         xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2008         if (xp == NULL)
2009                 return -ENOENT;
2010
2011         err = 0;
2012
2013         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2014         if (IS_ERR(out_skb)) {
2015                 err =  PTR_ERR(out_skb);
2016                 goto out;
2017         }
2018         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2019
2020         out_hdr = (struct sadb_msg *) out_skb->data;
2021         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2022         out_hdr->sadb_msg_type = SADB_X_SPDDELETE;
2023         out_hdr->sadb_msg_satype = 0;
2024         out_hdr->sadb_msg_errno = 0;
2025         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2026         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2027         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2028         err = 0;
2029
2030 out:
2031         xfrm_pol_put(xp);
2032         return err;
2033 }
2034
2035 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2036 {
2037         int err;
2038         struct sadb_x_policy *pol;
2039         struct xfrm_policy *xp;
2040         struct sk_buff *out_skb;
2041         struct sadb_msg *out_hdr;
2042
2043         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2044                 return -EINVAL;
2045
2046         xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2047                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2048         if (xp == NULL)
2049                 return -ENOENT;
2050
2051         err = 0;
2052
2053         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2054         if (IS_ERR(out_skb)) {
2055                 err =  PTR_ERR(out_skb);
2056                 goto out;
2057         }
2058         pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
2059
2060         out_hdr = (struct sadb_msg *) out_skb->data;
2061         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2062         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2063         out_hdr->sadb_msg_satype = 0;
2064         out_hdr->sadb_msg_errno = 0;
2065         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2066         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2067         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk);
2068         err = 0;
2069
2070 out:
2071         xfrm_pol_put(xp);
2072         return err;
2073 }
2074
2075 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2076 {
2077         struct pfkey_dump_data *data = ptr;
2078         struct sk_buff *out_skb;
2079         struct sadb_msg *out_hdr;
2080
2081         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2082         if (IS_ERR(out_skb))
2083                 return PTR_ERR(out_skb);
2084
2085         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2086
2087         out_hdr = (struct sadb_msg *) out_skb->data;
2088         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2089         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2090         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2091         out_hdr->sadb_msg_errno = 0;
2092         out_hdr->sadb_msg_seq = count;
2093         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2094         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2095         return 0;
2096 }
2097
2098 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2099 {
2100         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2101
2102         return xfrm_policy_walk(dump_sp, &data);
2103 }
2104
2105 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2106 {
2107         struct sk_buff *skb_out;
2108         struct sadb_msg *hdr_out;
2109
2110         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
2111         if (!skb_out)
2112                 return -ENOBUFS;
2113
2114         xfrm_policy_flush();
2115
2116         hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2117         pfkey_hdr_dup(hdr_out, hdr);
2118         hdr_out->sadb_msg_errno = (uint8_t) 0;
2119         hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2120         pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL);
2121
2122         return 0;
2123 }
2124
2125 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2126                              struct sadb_msg *hdr, void **ext_hdrs);
2127 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2128         [SADB_RESERVED]         = pfkey_reserved,
2129         [SADB_GETSPI]           = pfkey_getspi,
2130         [SADB_UPDATE]           = pfkey_add,
2131         [SADB_ADD]              = pfkey_add,
2132         [SADB_DELETE]           = pfkey_delete,
2133         [SADB_GET]              = pfkey_get,
2134         [SADB_ACQUIRE]          = pfkey_acquire,
2135         [SADB_REGISTER]         = pfkey_register,
2136         [SADB_EXPIRE]           = NULL,
2137         [SADB_FLUSH]            = pfkey_flush,
2138         [SADB_DUMP]             = pfkey_dump,
2139         [SADB_X_PROMISC]        = pfkey_promisc,
2140         [SADB_X_PCHANGE]        = NULL,
2141         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2142         [SADB_X_SPDADD]         = pfkey_spdadd,
2143         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2144         [SADB_X_SPDGET]         = pfkey_spdget,
2145         [SADB_X_SPDACQUIRE]     = NULL,
2146         [SADB_X_SPDDUMP]        = pfkey_spddump,
2147         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2148         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2149         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2150 };
2151
2152 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2153 {
2154         void *ext_hdrs[SADB_EXT_MAX];
2155         int err;
2156
2157         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2158                         BROADCAST_PROMISC_ONLY, NULL);
2159
2160         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2161         err = parse_exthdrs(skb, hdr, ext_hdrs);
2162         if (!err) {
2163                 err = -EOPNOTSUPP;
2164                 if (pfkey_funcs[hdr->sadb_msg_type])
2165                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2166         }
2167         return err;
2168 }
2169
2170 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2171 {
2172         struct sadb_msg *hdr = NULL;
2173
2174         if (skb->len < sizeof(*hdr)) {
2175                 *errp = -EMSGSIZE;
2176         } else {
2177                 hdr = (struct sadb_msg *) skb->data;
2178                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2179                     hdr->sadb_msg_reserved != 0 ||
2180                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2181                      hdr->sadb_msg_type > SADB_MAX)) {
2182                         hdr = NULL;
2183                         *errp = -EINVAL;
2184                 } else if (hdr->sadb_msg_len != (skb->len /
2185                                                  sizeof(uint64_t)) ||
2186                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2187                                                 sizeof(uint64_t))) {
2188                         hdr = NULL;
2189                         *errp = -EMSGSIZE;
2190                 } else {
2191                         *errp = 0;
2192                 }
2193         }
2194         return hdr;
2195 }
2196
2197 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2198 {
2199         return t->aalgos & (1 << d->desc.sadb_alg_id);
2200 }
2201
2202 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2203 {
2204         return t->ealgos & (1 << d->desc.sadb_alg_id);
2205 }
2206
2207 static int count_ah_combs(struct xfrm_tmpl *t)
2208 {
2209         int i, sz = 0;
2210
2211         for (i = 0; ; i++) {
2212                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2213                 if (!aalg)
2214                         break;
2215                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2216                         sz += sizeof(struct sadb_comb);
2217         }
2218         return sz + sizeof(struct sadb_prop);
2219 }
2220
2221 static int count_esp_combs(struct xfrm_tmpl *t)
2222 {
2223         int i, k, sz = 0;
2224
2225         for (i = 0; ; i++) {
2226                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2227                 if (!ealg)
2228                         break;
2229
2230                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2231                         continue;
2232
2233                 for (k = 1; ; k++) {
2234                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2235                         if (!aalg)
2236                                 break;
2237
2238                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2239                                 sz += sizeof(struct sadb_comb);
2240                 }
2241         }
2242         return sz + sizeof(struct sadb_prop);
2243 }
2244
2245 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2246 {
2247         struct sadb_prop *p;
2248         int i;
2249
2250         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2251         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2252         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2253         p->sadb_prop_replay = 32;
2254         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2255
2256         for (i = 0; ; i++) {
2257                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2258                 if (!aalg)
2259                         break;
2260
2261                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2262                         struct sadb_comb *c;
2263                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2264                         memset(c, 0, sizeof(*c));
2265                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2266                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2267                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2268                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2269                         c->sadb_comb_hard_addtime = 24*60*60;
2270                         c->sadb_comb_soft_addtime = 20*60*60;
2271                         c->sadb_comb_hard_usetime = 8*60*60;
2272                         c->sadb_comb_soft_usetime = 7*60*60;
2273                 }
2274         }
2275 }
2276
2277 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2278 {
2279         struct sadb_prop *p;
2280         int i, k;
2281
2282         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2283         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2284         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2285         p->sadb_prop_replay = 32;
2286         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2287
2288         for (i=0; ; i++) {
2289                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2290                 if (!ealg)
2291                         break;
2292
2293                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2294                         continue;
2295
2296                 for (k = 1; ; k++) {
2297                         struct sadb_comb *c;
2298                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2299                         if (!aalg)
2300                                 break;
2301                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2302                                 continue;
2303                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2304                         memset(c, 0, sizeof(*c));
2305                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2306                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2307                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2308                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2309                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2310                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2311                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2312                         c->sadb_comb_hard_addtime = 24*60*60;
2313                         c->sadb_comb_soft_addtime = 20*60*60;
2314                         c->sadb_comb_hard_usetime = 8*60*60;
2315                         c->sadb_comb_soft_usetime = 7*60*60;
2316                 }
2317         }
2318 }
2319
2320 static int pfkey_send_notify(struct xfrm_state *x, int hard)
2321 {
2322         struct sk_buff *out_skb;
2323         struct sadb_msg *out_hdr;
2324         int hsc = (hard ? 2 : 1);
2325
2326         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2327         if (IS_ERR(out_skb))
2328                 return PTR_ERR(out_skb);
2329
2330         out_hdr = (struct sadb_msg *) out_skb->data;
2331         out_hdr->sadb_msg_version = PF_KEY_V2;
2332         out_hdr->sadb_msg_type = SADB_EXPIRE;
2333         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2334         out_hdr->sadb_msg_errno = 0;
2335         out_hdr->sadb_msg_reserved = 0;
2336         out_hdr->sadb_msg_seq = 0;
2337         out_hdr->sadb_msg_pid = 0;
2338
2339         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2340         return 0;
2341 }
2342
2343 static u32 get_acqseq(void)
2344 {
2345         u32 res;
2346         static u32 acqseq;
2347         static DEFINE_SPINLOCK(acqseq_lock);
2348
2349         spin_lock_bh(&acqseq_lock);
2350         res = (++acqseq ? : ++acqseq);
2351         spin_unlock_bh(&acqseq_lock);
2352         return res;
2353 }
2354
2355 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2356 {
2357         struct sk_buff *skb;
2358         struct sadb_msg *hdr;
2359         struct sadb_address *addr;
2360         struct sadb_x_policy *pol;
2361         struct sockaddr_in *sin;
2362 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2363         struct sockaddr_in6 *sin6;
2364 #endif
2365         int sockaddr_size;
2366         int size;
2367
2368         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2369         if (!sockaddr_size)
2370                 return -EINVAL;
2371
2372         size = sizeof(struct sadb_msg) +
2373                 (sizeof(struct sadb_address) * 2) +
2374                 (sockaddr_size * 2) +
2375                 sizeof(struct sadb_x_policy);
2376
2377         if (x->id.proto == IPPROTO_AH)
2378                 size += count_ah_combs(t);
2379         else if (x->id.proto == IPPROTO_ESP)
2380                 size += count_esp_combs(t);
2381
2382         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2383         if (skb == NULL)
2384                 return -ENOMEM;
2385
2386         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2387         hdr->sadb_msg_version = PF_KEY_V2;
2388         hdr->sadb_msg_type = SADB_ACQUIRE;
2389         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2390         hdr->sadb_msg_len = size / sizeof(uint64_t);
2391         hdr->sadb_msg_errno = 0;
2392         hdr->sadb_msg_reserved = 0;
2393         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2394         hdr->sadb_msg_pid = 0;
2395
2396         /* src address */
2397         addr = (struct sadb_address*) skb_put(skb,
2398                                               sizeof(struct sadb_address)+sockaddr_size);
2399         addr->sadb_address_len =
2400                 (sizeof(struct sadb_address)+sockaddr_size)/
2401                         sizeof(uint64_t);
2402         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2403         addr->sadb_address_proto = 0;
2404         addr->sadb_address_reserved = 0;
2405         if (x->props.family == AF_INET) {
2406                 addr->sadb_address_prefixlen = 32;
2407
2408                 sin = (struct sockaddr_in *) (addr + 1);
2409                 sin->sin_family = AF_INET;
2410                 sin->sin_addr.s_addr = x->props.saddr.a4;
2411                 sin->sin_port = 0;
2412                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2413         }
2414 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2415         else if (x->props.family == AF_INET6) {
2416                 addr->sadb_address_prefixlen = 128;
2417
2418                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2419                 sin6->sin6_family = AF_INET6;
2420                 sin6->sin6_port = 0;
2421                 sin6->sin6_flowinfo = 0;
2422                 memcpy(&sin6->sin6_addr,
2423                        x->props.saddr.a6, sizeof(struct in6_addr));
2424                 sin6->sin6_scope_id = 0;
2425         }
2426 #endif
2427         else
2428                 BUG();
2429
2430         /* dst address */
2431         addr = (struct sadb_address*) skb_put(skb,
2432                                               sizeof(struct sadb_address)+sockaddr_size);
2433         addr->sadb_address_len =
2434                 (sizeof(struct sadb_address)+sockaddr_size)/
2435                         sizeof(uint64_t);
2436         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2437         addr->sadb_address_proto = 0;
2438         addr->sadb_address_reserved = 0;
2439         if (x->props.family == AF_INET) {
2440                 addr->sadb_address_prefixlen = 32;
2441
2442                 sin = (struct sockaddr_in *) (addr + 1);
2443                 sin->sin_family = AF_INET;
2444                 sin->sin_addr.s_addr = x->id.daddr.a4;
2445                 sin->sin_port = 0;
2446                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2447         }
2448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2449         else if (x->props.family == AF_INET6) {
2450                 addr->sadb_address_prefixlen = 128;
2451
2452                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2453                 sin6->sin6_family = AF_INET6;
2454                 sin6->sin6_port = 0;
2455                 sin6->sin6_flowinfo = 0;
2456                 memcpy(&sin6->sin6_addr,
2457                        x->id.daddr.a6, sizeof(struct in6_addr));
2458                 sin6->sin6_scope_id = 0;
2459         }
2460 #endif
2461         else
2462                 BUG();
2463
2464         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2465         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2466         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2467         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2468         pol->sadb_x_policy_dir = dir+1;
2469         pol->sadb_x_policy_id = xp->index;
2470
2471         /* Set sadb_comb's. */
2472         if (x->id.proto == IPPROTO_AH)
2473                 dump_ah_combs(skb, t);
2474         else if (x->id.proto == IPPROTO_ESP)
2475                 dump_esp_combs(skb, t);
2476
2477         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2478 }
2479
2480 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2481                                                 u8 *data, int len, int *dir)
2482 {
2483         struct xfrm_policy *xp;
2484         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2485
2486         switch (family) {
2487         case AF_INET:
2488                 if (opt != IP_IPSEC_POLICY) {
2489                         *dir = -EOPNOTSUPP;
2490                         return NULL;
2491                 }
2492                 break;
2493 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2494         case AF_INET6:
2495                 if (opt != IPV6_IPSEC_POLICY) {
2496                         *dir = -EOPNOTSUPP;
2497                         return NULL;
2498                 }
2499                 break;
2500 #endif
2501         default:
2502                 *dir = -EINVAL;
2503                 return NULL;
2504         }
2505
2506         *dir = -EINVAL;
2507
2508         if (len < sizeof(struct sadb_x_policy) ||
2509             pol->sadb_x_policy_len*8 > len ||
2510             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2511             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2512                 return NULL;
2513
2514         xp = xfrm_policy_alloc(GFP_ATOMIC);
2515         if (xp == NULL) {
2516                 *dir = -ENOBUFS;
2517                 return NULL;
2518         }
2519
2520         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2521                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2522
2523         xp->lft.soft_byte_limit = XFRM_INF;
2524         xp->lft.hard_byte_limit = XFRM_INF;
2525         xp->lft.soft_packet_limit = XFRM_INF;
2526         xp->lft.hard_packet_limit = XFRM_INF;
2527         xp->family = family;
2528
2529         xp->xfrm_nr = 0;
2530         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2531             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2532                 goto out;
2533
2534         *dir = pol->sadb_x_policy_dir-1;
2535         return xp;
2536
2537 out:
2538         kfree(xp);
2539         return NULL;
2540 }
2541
2542 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2543 {
2544         struct sk_buff *skb;
2545         struct sadb_msg *hdr;
2546         struct sadb_sa *sa;
2547         struct sadb_address *addr;
2548         struct sadb_x_nat_t_port *n_port;
2549         struct sockaddr_in *sin;
2550 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2551         struct sockaddr_in6 *sin6;
2552 #endif
2553         int sockaddr_size;
2554         int size;
2555         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2556         struct xfrm_encap_tmpl *natt = NULL;
2557
2558         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2559         if (!sockaddr_size)
2560                 return -EINVAL;
2561
2562         if (!satype)
2563                 return -EINVAL;
2564
2565         if (!x->encap)
2566                 return -EINVAL;
2567
2568         natt = x->encap;
2569
2570         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2571          *
2572          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2573          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2574          */
2575
2576         size = sizeof(struct sadb_msg) +
2577                 sizeof(struct sadb_sa) +
2578                 (sizeof(struct sadb_address) * 2) +
2579                 (sockaddr_size * 2) +
2580                 (sizeof(struct sadb_x_nat_t_port) * 2);
2581
2582         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2583         if (skb == NULL)
2584                 return -ENOMEM;
2585
2586         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2587         hdr->sadb_msg_version = PF_KEY_V2;
2588         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2589         hdr->sadb_msg_satype = satype;
2590         hdr->sadb_msg_len = size / sizeof(uint64_t);
2591         hdr->sadb_msg_errno = 0;
2592         hdr->sadb_msg_reserved = 0;
2593         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2594         hdr->sadb_msg_pid = 0;
2595
2596         /* SA */
2597         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2598         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2599         sa->sadb_sa_exttype = SADB_EXT_SA;
2600         sa->sadb_sa_spi = x->id.spi;
2601         sa->sadb_sa_replay = 0;
2602         sa->sadb_sa_state = 0;
2603         sa->sadb_sa_auth = 0;
2604         sa->sadb_sa_encrypt = 0;
2605         sa->sadb_sa_flags = 0;
2606
2607         /* ADDRESS_SRC (old addr) */
2608         addr = (struct sadb_address*)
2609                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2610         addr->sadb_address_len =
2611                 (sizeof(struct sadb_address)+sockaddr_size)/
2612                         sizeof(uint64_t);
2613         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2614         addr->sadb_address_proto = 0;
2615         addr->sadb_address_reserved = 0;
2616         if (x->props.family == AF_INET) {
2617                 addr->sadb_address_prefixlen = 32;
2618
2619                 sin = (struct sockaddr_in *) (addr + 1);
2620                 sin->sin_family = AF_INET;
2621                 sin->sin_addr.s_addr = x->props.saddr.a4;
2622                 sin->sin_port = 0;
2623                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2624         }
2625 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2626         else if (x->props.family == AF_INET6) {
2627                 addr->sadb_address_prefixlen = 128;
2628
2629                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2630                 sin6->sin6_family = AF_INET6;
2631                 sin6->sin6_port = 0;
2632                 sin6->sin6_flowinfo = 0;
2633                 memcpy(&sin6->sin6_addr,
2634                        x->props.saddr.a6, sizeof(struct in6_addr));
2635                 sin6->sin6_scope_id = 0;
2636         }
2637 #endif
2638         else
2639                 BUG();
2640
2641         /* NAT_T_SPORT (old port) */
2642         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2643         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2644         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2645         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2646         n_port->sadb_x_nat_t_port_reserved = 0;
2647
2648         /* ADDRESS_DST (new addr) */
2649         addr = (struct sadb_address*)
2650                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2651         addr->sadb_address_len =
2652                 (sizeof(struct sadb_address)+sockaddr_size)/
2653                         sizeof(uint64_t);
2654         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2655         addr->sadb_address_proto = 0;
2656         addr->sadb_address_reserved = 0;
2657         if (x->props.family == AF_INET) {
2658                 addr->sadb_address_prefixlen = 32;
2659
2660                 sin = (struct sockaddr_in *) (addr + 1);
2661                 sin->sin_family = AF_INET;
2662                 sin->sin_addr.s_addr = ipaddr->a4;
2663                 sin->sin_port = 0;
2664                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2665         }
2666 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2667         else if (x->props.family == AF_INET6) {
2668                 addr->sadb_address_prefixlen = 128;
2669
2670                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2671                 sin6->sin6_family = AF_INET6;
2672                 sin6->sin6_port = 0;
2673                 sin6->sin6_flowinfo = 0;
2674                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2675                 sin6->sin6_scope_id = 0;
2676         }
2677 #endif
2678         else
2679                 BUG();
2680
2681         /* NAT_T_DPORT (new port) */
2682         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2683         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2684         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2685         n_port->sadb_x_nat_t_port_port = sport;
2686         n_port->sadb_x_nat_t_port_reserved = 0;
2687
2688         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2689 }
2690
2691 static int pfkey_sendmsg(struct kiocb *kiocb,
2692                          struct socket *sock, struct msghdr *msg, size_t len)
2693 {
2694         struct sock *sk = sock->sk;
2695         struct sk_buff *skb = NULL;
2696         struct sadb_msg *hdr = NULL;
2697         int err;
2698
2699         err = -EOPNOTSUPP;
2700         if (msg->msg_flags & MSG_OOB)
2701                 goto out;
2702
2703         err = -EMSGSIZE;
2704         if ((unsigned)len > sk->sk_sndbuf - 32)
2705                 goto out;
2706
2707         err = -ENOBUFS;
2708         skb = alloc_skb(len, GFP_KERNEL);
2709         if (skb == NULL)
2710                 goto out;
2711
2712         err = -EFAULT;
2713         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2714                 goto out;
2715
2716         hdr = pfkey_get_base_msg(skb, &err);
2717         if (!hdr)
2718                 goto out;
2719
2720         down(&xfrm_cfg_sem);
2721         err = pfkey_process(sk, skb, hdr);
2722         up(&xfrm_cfg_sem);
2723
2724 out:
2725         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2726                 err = 0;
2727         if (skb)
2728                 kfree_skb(skb);
2729
2730         return err ? : len;
2731 }
2732
2733 static int pfkey_recvmsg(struct kiocb *kiocb,
2734                          struct socket *sock, struct msghdr *msg, size_t len,
2735                          int flags)
2736 {
2737         struct sock *sk = sock->sk;
2738         struct sk_buff *skb;
2739         int copied, err;
2740
2741         err = -EINVAL;
2742         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2743                 goto out;
2744
2745         msg->msg_namelen = 0;
2746         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2747         if (skb == NULL)
2748                 goto out;
2749
2750         copied = skb->len;
2751         if (copied > len) {
2752                 msg->msg_flags |= MSG_TRUNC;
2753                 copied = len;
2754         }
2755
2756         skb->h.raw = skb->data;
2757         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2758         if (err)
2759                 goto out_free;
2760
2761         sock_recv_timestamp(msg, sk, skb);
2762
2763         err = (flags & MSG_TRUNC) ? skb->len : copied;
2764
2765 out_free:
2766         skb_free_datagram(sk, skb);
2767 out:
2768         return err;
2769 }
2770
2771 static struct proto_ops pfkey_ops = {
2772         .family         =       PF_KEY,
2773         .owner          =       THIS_MODULE,
2774         /* Operations that make no sense on pfkey sockets. */
2775         .bind           =       sock_no_bind,
2776         .connect        =       sock_no_connect,
2777         .socketpair     =       sock_no_socketpair,
2778         .accept         =       sock_no_accept,
2779         .getname        =       sock_no_getname,
2780         .ioctl          =       sock_no_ioctl,
2781         .listen         =       sock_no_listen,
2782         .shutdown       =       sock_no_shutdown,
2783         .setsockopt     =       sock_no_setsockopt,
2784         .getsockopt     =       sock_no_getsockopt,
2785         .mmap           =       sock_no_mmap,
2786         .sendpage       =       sock_no_sendpage,
2787
2788         /* Now the operations that really occur. */
2789         .release        =       pfkey_release,
2790         .poll           =       datagram_poll,
2791         .sendmsg        =       pfkey_sendmsg,
2792         .recvmsg        =       pfkey_recvmsg,
2793 };
2794
2795 static struct net_proto_family pfkey_family_ops = {
2796         .family =       PF_KEY,
2797         .create =       pfkey_create,
2798         .owner  =       THIS_MODULE,
2799 };
2800
2801 #ifdef CONFIG_PROC_FS
2802 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2803                            int length, int *eof, void *data)
2804 {
2805         off_t pos = 0;
2806         off_t begin = 0;
2807         int len = 0;
2808         struct sock *s;
2809         struct hlist_node *node;
2810
2811         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
2812
2813         read_lock(&pfkey_table_lock);
2814
2815         sk_for_each(s, node, &pfkey_table) {
2816                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2817                                s,
2818                                atomic_read(&s->sk_refcnt),
2819                                atomic_read(&s->sk_rmem_alloc),
2820                                atomic_read(&s->sk_wmem_alloc),
2821                                sock_i_uid(s),
2822                                sock_i_ino(s)
2823                                );
2824
2825                 buffer[len++] = '\n';
2826
2827                 pos = begin + len;
2828                 if (pos < offset) {
2829                         len = 0;
2830                         begin = pos;
2831                 }
2832                 if(pos > offset + length)
2833                         goto done;
2834         }
2835         *eof = 1;
2836
2837 done:
2838         read_unlock(&pfkey_table_lock);
2839
2840         *start = buffer + (offset - begin);
2841         len -= (offset - begin);
2842
2843         if (len > length)
2844                 len = length;
2845         if (len < 0)
2846                 len = 0;
2847
2848         return len;
2849 }
2850 #endif
2851
2852 static struct xfrm_mgr pfkeyv2_mgr =
2853 {
2854         .id             = "pfkeyv2",
2855         .notify         = pfkey_send_notify,
2856         .acquire        = pfkey_send_acquire,
2857         .compile_policy = pfkey_compile_policy,
2858         .new_mapping    = pfkey_send_new_mapping,
2859 };
2860
2861 static void __exit ipsec_pfkey_exit(void)
2862 {
2863         xfrm_unregister_km(&pfkeyv2_mgr);
2864         remove_proc_entry("net/pfkey", NULL);
2865         sock_unregister(PF_KEY);
2866         proto_unregister(&key_proto);
2867 }
2868
2869 static int __init ipsec_pfkey_init(void)
2870 {
2871         int err = proto_register(&key_proto, 0);
2872
2873         if (err != 0)
2874                 goto out;
2875
2876         err = sock_register(&pfkey_family_ops);
2877         if (err != 0)
2878                 goto out_unregister_key_proto;
2879 #ifdef CONFIG_PROC_FS
2880         err = -ENOMEM;
2881         if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
2882                 goto out_sock_unregister;
2883 #endif
2884         err = xfrm_register_km(&pfkeyv2_mgr);
2885         if (err != 0)
2886                 goto out_remove_proc_entry;
2887 out:
2888         return err;
2889 out_remove_proc_entry:
2890 #ifdef CONFIG_PROC_FS
2891         remove_proc_entry("net/pfkey", NULL);
2892 out_sock_unregister:
2893 #endif
2894         sock_unregister(PF_KEY);
2895 out_unregister_key_proto:
2896         proto_unregister(&key_proto);
2897         goto out;
2898 }
2899
2900 module_init(ipsec_pfkey_init);
2901 module_exit(ipsec_pfkey_exit);
2902 MODULE_LICENSE("GPL");
2903 MODULE_ALIAS_NETPROTO(PF_KEY);