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   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/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         switch (x->km.state) {
 660         case XFRM_STATE_VALID:
 661                 sa->sadb_sa_state = x->km.dying ?
 662                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 663                 break;
 664         case XFRM_STATE_ACQ:
 665                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 666                 break;
 667         default:
 668                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 669                 break;
 670         }
 671         sa->sadb_sa_auth = 0;
 672         if (x->aalg) {
 673                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 674                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 675         }
 676         sa->sadb_sa_encrypt = 0;
 677         BUG_ON(x->ealg && x->calg);
 678         if (x->ealg) {
 679                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 680                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 681         }
 682         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 683         if (x->calg) {
 684                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 685                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 686         }
 687
 688         sa->sadb_sa_flags = 0;
 689         if (x->props.flags & XFRM_STATE_NOECN)
 690                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 691         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 692                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 693
 694         /* hard time */
 695         if (hsc & 2) {
 696                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 697                                                              sizeof(struct sadb_lifetime));
 698                 lifetime->sadb_lifetime_len =
 699                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 700                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 701                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 702                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 703                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 704                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 705         }
 706         /* soft time */
 707         if (hsc & 1) {
 708                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 709                                                              sizeof(struct sadb_lifetime));
 710                 lifetime->sadb_lifetime_len =
 711                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 712                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 713                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 714                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 715                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 716                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 717         }
 718         /* current time */
 719         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 720                                                      sizeof(struct sadb_lifetime));
 721         lifetime->sadb_lifetime_len =
 722                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 723         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 724         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 725         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 726         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 727         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 728         /* src address */
 729         addr = (struct sadb_address*) skb_put(skb,
 730                                               sizeof(struct sadb_address)+sockaddr_size);
 731         addr->sadb_address_len =
 732                 (sizeof(struct sadb_address)+sockaddr_size)/
 733                         sizeof(uint64_t);
 734         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 735         /* "if the ports are non-zero, then the sadb_address_proto field,
 736            normally zero, MUST be filled in with the transport
 737            protocol's number." - RFC2367 */
 738         addr->sadb_address_proto = 0;
 739         addr->sadb_address_reserved = 0;
 740         if (x->props.family == AF_INET) {
 741                 addr->sadb_address_prefixlen = 32;
 742
 743                 sin = (struct sockaddr_in *) (addr + 1);
 744                 sin->sin_family = AF_INET;
 745                 sin->sin_addr.s_addr = x->props.saddr.a4;
 746                 sin->sin_port = 0;
 747                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 748         }
 749 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 750         else if (x->props.family == AF_INET6) {
 751                 addr->sadb_address_prefixlen = 128;
 752
 753                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 754                 sin6->sin6_family = AF_INET6;
 755                 sin6->sin6_port = 0;
 756                 sin6->sin6_flowinfo = 0;
 757                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 758                        sizeof(struct in6_addr));
 759                 sin6->sin6_scope_id = 0;
 760         }
 761 #endif
 762         else
 763                 BUG();
 764
 765         /* dst address */
 766         addr = (struct sadb_address*) skb_put(skb,
 767                                               sizeof(struct sadb_address)+sockaddr_size);
 768         addr->sadb_address_len =
 769                 (sizeof(struct sadb_address)+sockaddr_size)/
 770                         sizeof(uint64_t);
 771         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 772         addr->sadb_address_proto = 0;
 773         addr->sadb_address_prefixlen = 32; /* XXX */
 774         addr->sadb_address_reserved = 0;
 775         if (x->props.family == AF_INET) {
 776                 sin = (struct sockaddr_in *) (addr + 1);
 777                 sin->sin_family = AF_INET;
 778                 sin->sin_addr.s_addr = x->id.daddr.a4;
 779                 sin->sin_port = 0;
 780                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 781
 782                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 783                         addr = (struct sadb_address*) skb_put(skb,
 784                                 sizeof(struct sadb_address)+sockaddr_size);
 785                         addr->sadb_address_len =
 786                                 (sizeof(struct sadb_address)+sockaddr_size)/
 787                                 sizeof(uint64_t);
 788                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 789                         addr->sadb_address_proto =
 790                                 pfkey_proto_from_xfrm(x->sel.proto);
 791                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 792                         addr->sadb_address_reserved = 0;
 793
 794                         sin = (struct sockaddr_in *) (addr + 1);
 795                         sin->sin_family = AF_INET;
 796                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 797                         sin->sin_port = x->sel.sport;
 798                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 799                 }
 800         }
 801 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 802         else if (x->props.family == AF_INET6) {
 803                 addr->sadb_address_prefixlen = 128;
 804
 805                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 806                 sin6->sin6_family = AF_INET6;
 807                 sin6->sin6_port = 0;
 808                 sin6->sin6_flowinfo = 0;
 809                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 810                 sin6->sin6_scope_id = 0;
 811
 812                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 813                             sizeof(struct in6_addr))) {
 814                         addr = (struct sadb_address *) skb_put(skb,
 815                                 sizeof(struct sadb_address)+sockaddr_size);
 816                         addr->sadb_address_len =
 817                                 (sizeof(struct sadb_address)+sockaddr_size)/
 818                                 sizeof(uint64_t);
 819                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 820                         addr->sadb_address_proto =
 821                                 pfkey_proto_from_xfrm(x->sel.proto);
 822                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 823                         addr->sadb_address_reserved = 0;
 824
 825                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 826                         sin6->sin6_family = AF_INET6;
 827                         sin6->sin6_port = x->sel.sport;
 828                         sin6->sin6_flowinfo = 0;
 829                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 830                                sizeof(struct in6_addr));
 831                         sin6->sin6_scope_id = 0;
 832                 }
 833         }
 834 #endif
 835         else
 836                 BUG();
 837
 838         /* auth key */
 839         if (add_keys && auth_key_size) {
 840                 key = (struct sadb_key *) skb_put(skb,
 841                                                   sizeof(struct sadb_key)+auth_key_size);
 842                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 843                         sizeof(uint64_t);
 844                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 845                 key->sadb_key_bits = x->aalg->alg_key_len;
 846                 key->sadb_key_reserved = 0;
 847                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 848         }
 849         /* encrypt key */
 850         if (add_keys && encrypt_key_size) {
 851                 key = (struct sadb_key *) skb_put(skb,
 852                                                   sizeof(struct sadb_key)+encrypt_key_size);
 853                 key->sadb_key_len = (sizeof(struct sadb_key) +
 854                                      encrypt_key_size) / sizeof(uint64_t);
 855                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 856                 key->sadb_key_bits = x->ealg->alg_key_len;
 857                 key->sadb_key_reserved = 0;
 858                 memcpy(key + 1, x->ealg->alg_key,
 859                        (x->ealg->alg_key_len+7)/8);
 860         }
 861
 862         /* sa */
 863         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 864         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 865         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 866         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 867         sa2->sadb_x_sa2_reserved1 = 0;
 868         sa2->sadb_x_sa2_reserved2 = 0;
 869         sa2->sadb_x_sa2_sequence = 0;
 870         sa2->sadb_x_sa2_reqid = x->props.reqid;
 871
 872         if (natt && natt->encap_type) {
 873                 struct sadb_x_nat_t_type *n_type;
 874                 struct sadb_x_nat_t_port *n_port;
 875
 876                 /* type */
 877                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 878                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 879                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 880                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 881                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 882                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 883                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 884
 885                 /* source port */
 886                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 887                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 888                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 889                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 890                 n_port->sadb_x_nat_t_port_reserved = 0;
 891
 892                 /* dest port */
 893                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 894                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 895                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 896                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 897                 n_port->sadb_x_nat_t_port_reserved = 0;
 898         }
 899
 900         return skb;
 901 }
 902
 903 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 904                                                 void **ext_hdrs)
 905 {
 906         struct xfrm_state *x;
 907         struct sadb_lifetime *lifetime;
 908         struct sadb_sa *sa;
 909         struct sadb_key *key;
 910         uint16_t proto;
 911         int err;
 912
 913
 914         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 915         if (!sa ||
 916             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 917                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 918                 return ERR_PTR(-EINVAL);
 919         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
 920             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
 921                 return ERR_PTR(-EINVAL);
 922         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
 923             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
 924                 return ERR_PTR(-EINVAL);
 925         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
 926             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
 927                 return ERR_PTR(-EINVAL);
 928
 929         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 930         if (proto == 0)
 931                 return ERR_PTR(-EINVAL);
 932
 933         /* default error is no buffer space */
 934         err = -ENOBUFS;
 935
 936         /* RFC2367:
 937
 938    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
 939    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
 940    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
 941    Therefore, the sadb_sa_state field of all submitted SAs MUST be
 942    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
 943    not true.
 944
 945            However, KAME setkey always uses SADB_SASTATE_LARVAL.
 946            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
 947          */
 948         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
 949             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
 950              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
 951             sa->sadb_sa_encrypt > SADB_EALG_MAX)
 952                 return ERR_PTR(-EINVAL);
 953         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 954         if (key != NULL &&
 955             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
 956             ((key->sadb_key_bits+7) / 8 == 0 ||
 957              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 958                 return ERR_PTR(-EINVAL);
 959         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
 960         if (key != NULL &&
 961             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
 962             ((key->sadb_key_bits+7) / 8 == 0 ||
 963              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 964                 return ERR_PTR(-EINVAL);
 965
 966         x = xfrm_state_alloc();
 967         if (x == NULL)
 968                 return ERR_PTR(-ENOBUFS);
 969
 970         x->id.proto = proto;
 971         x->id.spi = sa->sadb_sa_spi;
 972         x->props.replay_window = sa->sadb_sa_replay;
 973         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
 974                 x->props.flags |= XFRM_STATE_NOECN;
 975         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
 976                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
 977
 978         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
 979         if (lifetime != NULL) {
 980                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 981                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 982                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 983                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 984         }
 985         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
 986         if (lifetime != NULL) {
 987                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 988                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 989                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 990                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 991         }
 992         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 993         if (sa->sadb_sa_auth) {
 994                 int keysize = 0;
 995                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
 996                 if (!a) {
 997                         err = -ENOSYS;
 998                         goto out;
 999                 }
1000                 if (key)
1001                         keysize = (key->sadb_key_bits + 7) / 8;
1002                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1003                 if (!x->aalg)
1004                         goto out;
1005                 strcpy(x->aalg->alg_name, a->name);
1006                 x->aalg->alg_key_len = 0;
1007                 if (key) {
1008                         x->aalg->alg_key_len = key->sadb_key_bits;
1009                         memcpy(x->aalg->alg_key, key+1, keysize);
1010                 }
1011                 x->props.aalgo = sa->sadb_sa_auth;
1012                 /* x->algo.flags = sa->sadb_sa_flags; */
1013         }
1014         if (sa->sadb_sa_encrypt) {
1015                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1016                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1017                         if (!a) {
1018                                 err = -ENOSYS;
1019                                 goto out;
1020                         }
1021                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1022                         if (!x->calg)
1023                                 goto out;
1024                         strcpy(x->calg->alg_name, a->name);
1025                         x->props.calgo = sa->sadb_sa_encrypt;
1026                 } else {
1027                         int keysize = 0;
1028                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1029                         if (!a) {
1030                                 err = -ENOSYS;
1031                                 goto out;
1032                         }
1033                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1034                         if (key)
1035                                 keysize = (key->sadb_key_bits + 7) / 8;
1036                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1037                         if (!x->ealg)
1038                                 goto out;
1039                         strcpy(x->ealg->alg_name, a->name);
1040                         x->ealg->alg_key_len = 0;
1041                         if (key) {
1042                                 x->ealg->alg_key_len = key->sadb_key_bits;
1043                                 memcpy(x->ealg->alg_key, key+1, keysize);
1044                         }
1045                         x->props.ealgo = sa->sadb_sa_encrypt;
1046                 }
1047         }
1048         /* x->algo.flags = sa->sadb_sa_flags; */
1049
1050         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1051                                                     &x->props.saddr);
1052         if (!x->props.family) {
1053                 err = -EAFNOSUPPORT;
1054                 goto out;
1055         }
1056         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1057                                   &x->id.daddr);
1058
1059         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1060                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1061                 x->props.mode = sa2->sadb_x_sa2_mode;
1062                 if (x->props.mode)
1063                         x->props.mode--;
1064                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1065         }
1066
1067         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1068                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1069
1070                 /* Nobody uses this, but we try. */
1071                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1072                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1073         }
1074
1075         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1076                 struct sadb_x_nat_t_type* n_type;
1077                 struct xfrm_encap_tmpl *natt;
1078
1079                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1080                 if (!x->encap)
1081                         goto out;
1082
1083                 natt = x->encap;
1084                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1085                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1086
1087                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1088                         struct sadb_x_nat_t_port* n_port =
1089                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1090                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1091                 }
1092                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1093                         struct sadb_x_nat_t_port* n_port =
1094                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1095                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1096                 }
1097         }
1098
1099         x->type = xfrm_get_type(proto, x->props.family);
1100         if (x->type == NULL) {
1101                 err = -ENOPROTOOPT;
1102                 goto out;
1103         }
1104         if (x->type->init_state(x, NULL)) {
1105                 err = -EINVAL;
1106                 goto out;
1107         }
1108         x->km.seq = hdr->sadb_msg_seq;
1109         x->km.state = XFRM_STATE_VALID;
1110         return x;
1111
1112 out:
1113         x->km.state = XFRM_STATE_DEAD;
1114         xfrm_state_put(x);
1115         return ERR_PTR(err);
1116 }
1117
1118 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1119 {
1120         return -EOPNOTSUPP;
1121 }
1122
1123 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1124 {
1125         struct sk_buff *resp_skb;
1126         struct sadb_x_sa2 *sa2;
1127         struct sadb_address *saddr, *daddr;
1128         struct sadb_msg *out_hdr;
1129         struct xfrm_state *x = NULL;
1130         u8 mode;
1131         u32 reqid;
1132         u8 proto;
1133         unsigned short family;
1134         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1135
1136         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1137                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1138                 return -EINVAL;
1139
1140         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1141         if (proto == 0)
1142                 return -EINVAL;
1143
1144         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1145                 mode = sa2->sadb_x_sa2_mode - 1;
1146                 reqid = sa2->sadb_x_sa2_reqid;
1147         } else {
1148                 mode = 0;
1149                 reqid = 0;
1150         }
1151
1152         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1153         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1154
1155         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1156         switch (family) {
1157         case AF_INET:
1158                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1159                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1160                 break;
1161 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1162         case AF_INET6:
1163                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1164                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1165                 break;
1166 #endif
1167         }
1168
1169         if (hdr->sadb_msg_seq) {
1170                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1171                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1172                         xfrm_state_put(x);
1173                         x = NULL;
1174                 }
1175         }
1176
1177         if (!x)
1178                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1179
1180         if (x == NULL)
1181                 return -ENOENT;
1182
1183         resp_skb = ERR_PTR(-ENOENT);
1184
1185         spin_lock_bh(&x->lock);
1186         if (x->km.state != XFRM_STATE_DEAD) {
1187                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1188                 u32 min_spi, max_spi;
1189
1190                 if (range != NULL) {
1191                         min_spi = range->sadb_spirange_min;
1192                         max_spi = range->sadb_spirange_max;
1193                 } else {
1194                         min_spi = 0x100;
1195                         max_spi = 0x0fffffff;
1196                 }
1197                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1198                 if (x->id.spi)
1199                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1200         }
1201         spin_unlock_bh(&x->lock);
1202
1203         if (IS_ERR(resp_skb)) {
1204                 xfrm_state_put(x);
1205                 return  PTR_ERR(resp_skb);
1206         }
1207
1208         out_hdr = (struct sadb_msg *) resp_skb->data;
1209         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1210         out_hdr->sadb_msg_type = SADB_GETSPI;
1211         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1212         out_hdr->sadb_msg_errno = 0;
1213         out_hdr->sadb_msg_reserved = 0;
1214         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1215         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1216
1217         xfrm_state_put(x);
1218
1219         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1220
1221         return 0;
1222 }
1223
1224 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1225 {
1226         struct xfrm_state *x;
1227
1228         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1229                 return -EOPNOTSUPP;
1230
1231         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1232                 return 0;
1233
1234         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1235         if (x == NULL)
1236                 return 0;
1237
1238         spin_lock_bh(&x->lock);
1239         if (x->km.state == XFRM_STATE_ACQ) {
1240                 x->km.state = XFRM_STATE_ERROR;
1241                 wake_up(&km_waitq);
1242         }
1243         spin_unlock_bh(&x->lock);
1244         xfrm_state_put(x);
1245         return 0;
1246 }
1247
1248 static inline int event2poltype(int event)
1249 {
1250         switch (event) {
1251         case XFRM_SAP_DELETED:
1252                 return SADB_X_SPDDELETE;
1253         case XFRM_SAP_ADDED:
1254                 return SADB_X_SPDADD;
1255         case XFRM_SAP_UPDATED:
1256                 return SADB_X_SPDUPDATE;
1257         case XFRM_SAP_EXPIRED:
1258         //      return SADB_X_SPDEXPIRE;
1259         default:
1260                 printk("pfkey: Unknown policy event %d\n", event);
1261                 break;
1262         }
1263
1264         return 0;
1265 }
1266
1267 static inline int event2keytype(int event)
1268 {
1269         switch (event) {
1270         case XFRM_SAP_DELETED:
1271                 return SADB_DELETE;
1272         case XFRM_SAP_ADDED:
1273                 return SADB_ADD;
1274         case XFRM_SAP_UPDATED:
1275                 return SADB_UPDATE;
1276         case XFRM_SAP_EXPIRED:
1277                 return SADB_EXPIRE;
1278         default:
1279                 printk("pfkey: Unknown SA event %d\n", event);
1280                 break;
1281         }
1282
1283         return 0;
1284 }
1285
1286 /* ADD/UPD/DEL */
1287 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1288 {
1289         struct sk_buff *skb;
1290         struct sadb_msg *hdr;
1291         int hsc = 3;
1292
1293         if (c->event == XFRM_SAP_DELETED)
1294                 hsc = 0;
1295
1296         skb = pfkey_xfrm_state2msg(x, 0, hsc);
1297
1298         if (IS_ERR(skb))
1299                 return PTR_ERR(skb);
1300
1301         hdr = (struct sadb_msg *) skb->data;
1302         hdr->sadb_msg_version = PF_KEY_V2;
1303         hdr->sadb_msg_type = event2keytype(c->event);
1304         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1305         hdr->sadb_msg_errno = 0;
1306         hdr->sadb_msg_reserved = 0;
1307         hdr->sadb_msg_seq = c->seq;
1308         hdr->sadb_msg_pid = c->pid;
1309
1310         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1311
1312         return 0;
1313 }
1314
1315 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1316 {
1317         struct xfrm_state *x;
1318         int err;
1319         struct km_event c;
1320
1321         xfrm_probe_algs();
1322
1323         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1324         if (IS_ERR(x))
1325                 return PTR_ERR(x);
1326
1327         xfrm_state_hold(x);
1328         if (hdr->sadb_msg_type == SADB_ADD)
1329                 err = xfrm_state_add(x);
1330         else
1331                 err = xfrm_state_update(x);
1332
1333         if (err < 0) {
1334                 x->km.state = XFRM_STATE_DEAD;
1335                 xfrm_state_put(x);
1336                 return err;
1337         }
1338
1339         if (hdr->sadb_msg_type == SADB_ADD)
1340                 c.event = XFRM_SAP_ADDED;
1341         else
1342                 c.event = XFRM_SAP_UPDATED;
1343         c.seq = hdr->sadb_msg_seq;
1344         c.pid = hdr->sadb_msg_pid;
1345         km_state_notify(x, &c);
1346         xfrm_state_put(x);
1347
1348         return err;
1349 }
1350
1351 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1352 {
1353         struct xfrm_state *x;
1354         struct km_event c;
1355         int err;
1356
1357         if (!ext_hdrs[SADB_EXT_SA-1] ||
1358             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1359                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1360                 return -EINVAL;
1361
1362         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1363         if (x == NULL)
1364                 return -ESRCH;
1365
1366         if (xfrm_state_kern(x)) {
1367                 xfrm_state_put(x);
1368                 return -EPERM;
1369         }
1370
1371         err = xfrm_state_delete(x);
1372         if (err < 0) {
1373                 xfrm_state_put(x);
1374                 return err;
1375         }
1376
1377         c.seq = hdr->sadb_msg_seq;
1378         c.pid = hdr->sadb_msg_pid;
1379         c.event = XFRM_SAP_DELETED;
1380         km_state_notify(x, &c);
1381         xfrm_state_put(x);
1382
1383         return err;
1384 }
1385
1386 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1387 {
1388         __u8 proto;
1389         struct sk_buff *out_skb;
1390         struct sadb_msg *out_hdr;
1391         struct xfrm_state *x;
1392
1393         if (!ext_hdrs[SADB_EXT_SA-1] ||
1394             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1395                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1396                 return -EINVAL;
1397
1398         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1399         if (x == NULL)
1400                 return -ESRCH;
1401
1402         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1403         proto = x->id.proto;
1404         xfrm_state_put(x);
1405         if (IS_ERR(out_skb))
1406                 return  PTR_ERR(out_skb);
1407
1408         out_hdr = (struct sadb_msg *) out_skb->data;
1409         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1410         out_hdr->sadb_msg_type = SADB_DUMP;
1411         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1412         out_hdr->sadb_msg_errno = 0;
1413         out_hdr->sadb_msg_reserved = 0;
1414         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1415         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1416         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1417
1418         return 0;
1419 }
1420
1421 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1422 {
1423         struct sk_buff *skb;
1424         struct sadb_msg *hdr;
1425         int len, auth_len, enc_len, i;
1426
1427         auth_len = xfrm_count_auth_supported();
1428         if (auth_len) {
1429                 auth_len *= sizeof(struct sadb_alg);
1430                 auth_len += sizeof(struct sadb_supported);
1431         }
1432
1433         enc_len = xfrm_count_enc_supported();
1434         if (enc_len) {
1435                 enc_len *= sizeof(struct sadb_alg);
1436                 enc_len += sizeof(struct sadb_supported);
1437         }
1438
1439         len = enc_len + auth_len + sizeof(struct sadb_msg);
1440
1441         skb = alloc_skb(len + 16, allocation);
1442         if (!skb)
1443                 goto out_put_algs;
1444
1445         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1446         pfkey_hdr_dup(hdr, orig);
1447         hdr->sadb_msg_errno = 0;
1448         hdr->sadb_msg_len = len / sizeof(uint64_t);
1449
1450         if (auth_len) {
1451                 struct sadb_supported *sp;
1452                 struct sadb_alg *ap;
1453
1454                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1455                 ap = (struct sadb_alg *) (sp + 1);
1456
1457                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1458                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1459
1460                 for (i = 0; ; i++) {
1461                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1462                         if (!aalg)
1463                                 break;
1464                         if (aalg->available)
1465                                 *ap++ = aalg->desc;
1466                 }
1467         }
1468
1469         if (enc_len) {
1470                 struct sadb_supported *sp;
1471                 struct sadb_alg *ap;
1472
1473                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1474                 ap = (struct sadb_alg *) (sp + 1);
1475
1476                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1477                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1478
1479                 for (i = 0; ; i++) {
1480                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1481                         if (!ealg)
1482                                 break;
1483                         if (ealg->available)
1484                                 *ap++ = ealg->desc;
1485                 }
1486         }
1487
1488 out_put_algs:
1489         return skb;
1490 }
1491
1492 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1493 {
1494         struct pfkey_sock *pfk = pfkey_sk(sk);
1495         struct sk_buff *supp_skb;
1496
1497         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1498                 return -EINVAL;
1499
1500         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1501                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1502                         return -EEXIST;
1503                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1504         }
1505
1506         xfrm_probe_algs();
1507
1508         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1509         if (!supp_skb) {
1510                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1511                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1512
1513                 return -ENOBUFS;
1514         }
1515
1516         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1517
1518         return 0;
1519 }
1520
1521 static int key_notify_sa_flush(struct km_event *c)
1522 {
1523         struct sk_buff *skb;
1524         struct sadb_msg *hdr;
1525
1526         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1527         if (!skb)
1528                 return -ENOBUFS;
1529         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1530         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1531         hdr->sadb_msg_seq = c->seq;
1532         hdr->sadb_msg_pid = c->pid;
1533         hdr->sadb_msg_version = PF_KEY_V2;
1534         hdr->sadb_msg_errno = (uint8_t) 0;
1535         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1536
1537         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1538
1539         return 0;
1540 }
1541
1542 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1543 {
1544         unsigned proto;
1545         struct km_event c;
1546
1547         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1548         if (proto == 0)
1549                 return -EINVAL;
1550
1551         xfrm_state_flush(proto);
1552         c.data.proto = proto;
1553         c.seq = hdr->sadb_msg_seq;
1554         c.pid = hdr->sadb_msg_pid;
1555         c.event = XFRM_SAP_FLUSHED;
1556         km_state_notify(NULL, &c);
1557
1558         return 0;
1559 }
1560
1561 struct pfkey_dump_data
1562 {
1563         struct sk_buff *skb;
1564         struct sadb_msg *hdr;
1565         struct sock *sk;
1566 };
1567
1568 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1569 {
1570         struct pfkey_dump_data *data = ptr;
1571         struct sk_buff *out_skb;
1572         struct sadb_msg *out_hdr;
1573
1574         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1575         if (IS_ERR(out_skb))
1576                 return PTR_ERR(out_skb);
1577
1578         out_hdr = (struct sadb_msg *) out_skb->data;
1579         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1580         out_hdr->sadb_msg_type = SADB_DUMP;
1581         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1582         out_hdr->sadb_msg_errno = 0;
1583         out_hdr->sadb_msg_reserved = 0;
1584         out_hdr->sadb_msg_seq = count;
1585         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1586         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1587         return 0;
1588 }
1589
1590 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1591 {
1592         u8 proto;
1593         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1594
1595         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1596         if (proto == 0)
1597                 return -EINVAL;
1598
1599         return xfrm_state_walk(proto, dump_sa, &data);
1600 }
1601
1602 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1603 {
1604         struct pfkey_sock *pfk = pfkey_sk(sk);
1605         int satype = hdr->sadb_msg_satype;
1606
1607         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1608                 /* XXX we mangle packet... */
1609                 hdr->sadb_msg_errno = 0;
1610                 if (satype != 0 && satype != 1)
1611                         return -EINVAL;
1612                 pfk->promisc = satype;
1613         }
1614         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1615         return 0;
1616 }
1617
1618 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1619 {
1620         int i;
1621         u32 reqid = *(u32*)ptr;
1622
1623         for (i=0; i<xp->xfrm_nr; i++) {
1624                 if (xp->xfrm_vec[i].reqid == reqid)
1625                         return -EEXIST;
1626         }
1627         return 0;
1628 }
1629
1630 static u32 gen_reqid(void)
1631 {
1632         u32 start;
1633         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1634
1635         start = reqid;
1636         do {
1637                 ++reqid;
1638                 if (reqid == 0)
1639                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1640                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1641                         return reqid;
1642         } while (reqid != start);
1643         return 0;
1644 }
1645
1646 static int
1647 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1648 {
1649         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1650         struct sockaddr_in *sin;
1651 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1652         struct sockaddr_in6 *sin6;
1653 #endif
1654
1655         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1656                 return -ELOOP;
1657
1658         if (rq->sadb_x_ipsecrequest_mode == 0)
1659                 return -EINVAL;
1660
1661         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1662         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1663         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1664                 t->optional = 1;
1665         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1666                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1667                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1668                         t->reqid = 0;
1669                 if (!t->reqid && !(t->reqid = gen_reqid()))
1670                         return -ENOBUFS;
1671         }
1672
1673         /* addresses present only in tunnel mode */
1674         if (t->mode) {
1675                 switch (xp->family) {
1676                 case AF_INET:
1677                         sin = (void*)(rq+1);
1678                         if (sin->sin_family != AF_INET)
1679                                 return -EINVAL;
1680                         t->saddr.a4 = sin->sin_addr.s_addr;
1681                         sin++;
1682                         if (sin->sin_family != AF_INET)
1683                                 return -EINVAL;
1684                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1685                         break;
1686 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1687                 case AF_INET6:
1688                         sin6 = (void *)(rq+1);
1689                         if (sin6->sin6_family != AF_INET6)
1690                                 return -EINVAL;
1691                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1692                         sin6++;
1693                         if (sin6->sin6_family != AF_INET6)
1694                                 return -EINVAL;
1695                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1696                         break;
1697 #endif
1698                 default:
1699                         return -EINVAL;
1700                 }
1701         }
1702         /* No way to set this via kame pfkey */
1703         t->aalgos = t->ealgos = t->calgos = ~0;
1704         xp->xfrm_nr++;
1705         return 0;
1706 }
1707
1708 static int
1709 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1710 {
1711         int err;
1712         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1713         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1714
1715         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1716                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1717                         return err;
1718                 len -= rq->sadb_x_ipsecrequest_len;
1719                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1720         }
1721         return 0;
1722 }
1723
1724 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1725 {
1726         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1727         int socklen = (xp->family == AF_INET ?
1728                        sizeof(struct sockaddr_in) :
1729                        sizeof(struct sockaddr_in6));
1730
1731         return sizeof(struct sadb_msg) +
1732                 (sizeof(struct sadb_lifetime) * 3) +
1733                 (sizeof(struct sadb_address) * 2) +
1734                 (sockaddr_size * 2) +
1735                 sizeof(struct sadb_x_policy) +
1736                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1737                                 (socklen * 2)));
1738 }
1739
1740 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1741 {
1742         struct sk_buff *skb;
1743         int size;
1744
1745         size = pfkey_xfrm_policy2msg_size(xp);
1746
1747         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1748         if (skb == NULL)
1749                 return ERR_PTR(-ENOBUFS);
1750
1751         return skb;
1752 }
1753
1754 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1755 {
1756         struct sadb_msg *hdr;
1757         struct sadb_address *addr;
1758         struct sadb_lifetime *lifetime;
1759         struct sadb_x_policy *pol;
1760         struct sockaddr_in   *sin;
1761 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1762         struct sockaddr_in6  *sin6;
1763 #endif
1764         int i;
1765         int size;
1766         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1767         int socklen = (xp->family == AF_INET ?
1768                        sizeof(struct sockaddr_in) :
1769                        sizeof(struct sockaddr_in6));
1770
1771         size = pfkey_xfrm_policy2msg_size(xp);
1772
1773         /* call should fill header later */
1774         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1775         memset(hdr, 0, size);   /* XXX do we need this ? */
1776
1777         /* src address */
1778         addr = (struct sadb_address*) skb_put(skb,
1779                                               sizeof(struct sadb_address)+sockaddr_size);
1780         addr->sadb_address_len =
1781                 (sizeof(struct sadb_address)+sockaddr_size)/
1782                         sizeof(uint64_t);
1783         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1784         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1785         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1786         addr->sadb_address_reserved = 0;
1787         /* src address */
1788         if (xp->family == AF_INET) {
1789                 sin = (struct sockaddr_in *) (addr + 1);
1790                 sin->sin_family = AF_INET;
1791                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1792                 sin->sin_port = xp->selector.sport;
1793                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1794         }
1795 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1796         else if (xp->family == AF_INET6) {
1797                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1798                 sin6->sin6_family = AF_INET6;
1799                 sin6->sin6_port = xp->selector.sport;
1800                 sin6->sin6_flowinfo = 0;
1801                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1802                        sizeof(struct in6_addr));
1803                 sin6->sin6_scope_id = 0;
1804         }
1805 #endif
1806         else
1807                 BUG();
1808
1809         /* dst address */
1810         addr = (struct sadb_address*) skb_put(skb,
1811                                               sizeof(struct sadb_address)+sockaddr_size);
1812         addr->sadb_address_len =
1813                 (sizeof(struct sadb_address)+sockaddr_size)/
1814                         sizeof(uint64_t);
1815         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1816         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1817         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1818         addr->sadb_address_reserved = 0;
1819         if (xp->family == AF_INET) {
1820                 sin = (struct sockaddr_in *) (addr + 1);
1821                 sin->sin_family = AF_INET;
1822                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1823                 sin->sin_port = xp->selector.dport;
1824                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1825         }
1826 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1827         else if (xp->family == AF_INET6) {
1828                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1829                 sin6->sin6_family = AF_INET6;
1830                 sin6->sin6_port = xp->selector.dport;
1831                 sin6->sin6_flowinfo = 0;
1832                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1833                        sizeof(struct in6_addr));
1834                 sin6->sin6_scope_id = 0;
1835         }
1836 #endif
1837         else
1838                 BUG();
1839
1840         /* hard time */
1841         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1842                                                      sizeof(struct sadb_lifetime));
1843         lifetime->sadb_lifetime_len =
1844                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1845         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1846         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1847         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1848         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1849         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1850         /* soft time */
1851         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1852                                                      sizeof(struct sadb_lifetime));
1853         lifetime->sadb_lifetime_len =
1854                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1855         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1856         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1857         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1858         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1859         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1860         /* current time */
1861         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1862                                                      sizeof(struct sadb_lifetime));
1863         lifetime->sadb_lifetime_len =
1864                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1865         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1866         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1867         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1868         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1869         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1870
1871         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1872         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1873         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1874         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1875         if (xp->action == XFRM_POLICY_ALLOW) {
1876                 if (xp->xfrm_nr)
1877                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1878                 else
1879                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1880         }
1881         pol->sadb_x_policy_dir = dir+1;
1882         pol->sadb_x_policy_id = xp->index;
1883         pol->sadb_x_policy_priority = xp->priority;
1884
1885         for (i=0; i<xp->xfrm_nr; i++) {
1886                 struct sadb_x_ipsecrequest *rq;
1887                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1888                 int req_size;
1889
1890                 req_size = sizeof(struct sadb_x_ipsecrequest);
1891                 if (t->mode)
1892                         req_size += 2*socklen;
1893                 else
1894                         size -= 2*socklen;
1895                 rq = (void*)skb_put(skb, req_size);
1896                 pol->sadb_x_policy_len += req_size/8;
1897                 memset(rq, 0, sizeof(*rq));
1898                 rq->sadb_x_ipsecrequest_len = req_size;
1899                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1900                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1901                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1902                 if (t->reqid)
1903                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1904                 if (t->optional)
1905                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1906                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1907                 if (t->mode) {
1908                         switch (xp->family) {
1909                         case AF_INET:
1910                                 sin = (void*)(rq+1);
1911                                 sin->sin_family = AF_INET;
1912                                 sin->sin_addr.s_addr = t->saddr.a4;
1913                                 sin->sin_port = 0;
1914                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1915                                 sin++;
1916                                 sin->sin_family = AF_INET;
1917                                 sin->sin_addr.s_addr = t->id.daddr.a4;
1918                                 sin->sin_port = 0;
1919                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1920                                 break;
1921 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1922                         case AF_INET6:
1923                                 sin6 = (void*)(rq+1);
1924                                 sin6->sin6_family = AF_INET6;
1925                                 sin6->sin6_port = 0;
1926                                 sin6->sin6_flowinfo = 0;
1927                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
1928                                        sizeof(struct in6_addr));
1929                                 sin6->sin6_scope_id = 0;
1930
1931                                 sin6++;
1932                                 sin6->sin6_family = AF_INET6;
1933                                 sin6->sin6_port = 0;
1934                                 sin6->sin6_flowinfo = 0;
1935                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1936                                        sizeof(struct in6_addr));
1937                                 sin6->sin6_scope_id = 0;
1938                                 break;
1939 #endif
1940                         default:
1941                                 break;
1942                         }
1943                 }
1944         }
1945         hdr->sadb_msg_len = size / sizeof(uint64_t);
1946         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1947 }
1948
1949 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1950 {
1951         struct sk_buff *out_skb;
1952         struct sadb_msg *out_hdr;
1953         int err;
1954
1955         out_skb = pfkey_xfrm_policy2msg_prep(xp);
1956         if (IS_ERR(out_skb)) {
1957                 err = PTR_ERR(out_skb);
1958                 goto out;
1959         }
1960         pfkey_xfrm_policy2msg(out_skb, xp, dir);
1961
1962         out_hdr = (struct sadb_msg *) out_skb->data;
1963         out_hdr->sadb_msg_version = PF_KEY_V2;
1964
1965         if (c->data.byid && c->event == XFRM_SAP_DELETED)
1966                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
1967         else
1968                 out_hdr->sadb_msg_type = event2poltype(c->event);
1969         out_hdr->sadb_msg_errno = 0;
1970         out_hdr->sadb_msg_seq = c->seq;
1971         out_hdr->sadb_msg_pid = c->pid;
1972         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1973 out:
1974         return 0;
1975
1976 }
1977
1978 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1979 {
1980         int err;
1981         struct sadb_lifetime *lifetime;
1982         struct sadb_address *sa;
1983         struct sadb_x_policy *pol;
1984         struct xfrm_policy *xp;
1985         struct km_event c;
1986
1987         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1988                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1989             !ext_hdrs[SADB_X_EXT_POLICY-1])
1990                 return -EINVAL;
1991
1992         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1993         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1994                 return -EINVAL;
1995         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1996                 return -EINVAL;
1997
1998         xp = xfrm_policy_alloc(GFP_KERNEL);
1999         if (xp == NULL)
2000                 return -ENOBUFS;
2001
2002         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2003                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2004         xp->priority = pol->sadb_x_policy_priority;
2005
2006         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2007         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2008         if (!xp->family) {
2009                 err = -EINVAL;
2010                 goto out;
2011         }
2012         xp->selector.family = xp->family;
2013         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2014         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2015         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2016         if (xp->selector.sport)
2017                 xp->selector.sport_mask = ~0;
2018
2019         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2020         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2021         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2022
2023         /* Amusing, we set this twice.  KAME apps appear to set same value
2024          * in both addresses.
2025          */
2026         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2027
2028         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2029         if (xp->selector.dport)
2030                 xp->selector.dport_mask = ~0;
2031
2032         xp->lft.soft_byte_limit = XFRM_INF;
2033         xp->lft.hard_byte_limit = XFRM_INF;
2034         xp->lft.soft_packet_limit = XFRM_INF;
2035         xp->lft.hard_packet_limit = XFRM_INF;
2036         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2037                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2038                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2039                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2040                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2041         }
2042         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2043                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2044                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2045                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2046                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2047         }
2048         xp->xfrm_nr = 0;
2049         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2050             (err = parse_ipsecrequests(xp, pol)) < 0)
2051                 goto out;
2052
2053         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2054                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2055         if (err) {
2056                 kfree(xp);
2057                 return err;
2058         }
2059
2060         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2061                 c.event = XFRM_SAP_UPDATED;
2062         else
2063                 c.event = XFRM_SAP_ADDED;
2064
2065         c.seq = hdr->sadb_msg_seq;
2066         c.pid = hdr->sadb_msg_pid;
2067
2068         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2069         xfrm_pol_put(xp);
2070         return 0;
2071
2072 out:
2073         kfree(xp);
2074         return err;
2075 }
2076
2077 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2078 {
2079         int err;
2080         struct sadb_address *sa;
2081         struct sadb_x_policy *pol;
2082         struct xfrm_policy *xp;
2083         struct xfrm_selector sel;
2084         struct km_event c;
2085
2086         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2087                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2088             !ext_hdrs[SADB_X_EXT_POLICY-1])
2089                 return -EINVAL;
2090
2091         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2092         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2093                 return -EINVAL;
2094
2095         memset(&sel, 0, sizeof(sel));
2096
2097         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2098         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2099         sel.prefixlen_s = sa->sadb_address_prefixlen;
2100         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2101         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2102         if (sel.sport)
2103                 sel.sport_mask = ~0;
2104
2105         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2106         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2107         sel.prefixlen_d = sa->sadb_address_prefixlen;
2108         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2109         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2110         if (sel.dport)
2111                 sel.dport_mask = ~0;
2112
2113         xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2114         if (xp == NULL)
2115                 return -ENOENT;
2116
2117         err = 0;
2118
2119         c.seq = hdr->sadb_msg_seq;
2120         c.pid = hdr->sadb_msg_pid;
2121         c.event = XFRM_SAP_DELETED;
2122         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2123
2124         xfrm_pol_put(xp);
2125         return err;
2126 }
2127
2128 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2129 {
2130         int err;
2131         struct sk_buff *out_skb;
2132         struct sadb_msg *out_hdr;
2133         err = 0;
2134
2135         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2136         if (IS_ERR(out_skb)) {
2137                 err =  PTR_ERR(out_skb);
2138                 goto out;
2139         }
2140         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2141
2142         out_hdr = (struct sadb_msg *) out_skb->data;
2143         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2144         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2145         out_hdr->sadb_msg_satype = 0;
2146         out_hdr->sadb_msg_errno = 0;
2147         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2148         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2149         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2150         err = 0;
2151
2152 out:
2153         return err;
2154 }
2155
2156 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2157 {
2158         int err;
2159         struct sadb_x_policy *pol;
2160         struct xfrm_policy *xp;
2161         struct km_event c;
2162
2163         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2164                 return -EINVAL;
2165
2166         xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2167                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2168         if (xp == NULL)
2169                 return -ENOENT;
2170
2171         err = 0;
2172
2173         c.seq = hdr->sadb_msg_seq;
2174         c.pid = hdr->sadb_msg_pid;
2175         if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
2176                 c.data.byid = 1;
2177                 c.event = XFRM_SAP_DELETED;
2178                 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2179         } else {
2180                 err = key_pol_get_resp(sk, xp, hdr, pol->sadb_x_policy_dir-1);
2181         }
2182
2183         xfrm_pol_put(xp);
2184         return err;
2185 }
2186
2187 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2188 {
2189         struct pfkey_dump_data *data = ptr;
2190         struct sk_buff *out_skb;
2191         struct sadb_msg *out_hdr;
2192
2193         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2194         if (IS_ERR(out_skb))
2195                 return PTR_ERR(out_skb);
2196
2197         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2198
2199         out_hdr = (struct sadb_msg *) out_skb->data;
2200         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2201         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2202         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2203         out_hdr->sadb_msg_errno = 0;
2204         out_hdr->sadb_msg_seq = count;
2205         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2206         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2207         return 0;
2208 }
2209
2210 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2211 {
2212         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2213
2214         return xfrm_policy_walk(dump_sp, &data);
2215 }
2216
2217 static int key_notify_policy_flush(struct km_event *c)
2218 {
2219         struct sk_buff *skb_out;
2220         struct sadb_msg *hdr;
2221
2222         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2223         if (!skb_out)
2224                 return -ENOBUFS;
2225         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2226         hdr->sadb_msg_seq = c->seq;
2227         hdr->sadb_msg_pid = c->pid;
2228         hdr->sadb_msg_version = PF_KEY_V2;
2229         hdr->sadb_msg_errno = (uint8_t) 0;
2230         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2231         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2232         return 0;
2233
2234 }
2235
2236 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2237 {
2238         struct km_event c;
2239
2240         xfrm_policy_flush();
2241         c.event = XFRM_SAP_FLUSHED;
2242         c.pid = hdr->sadb_msg_pid;
2243         c.seq = hdr->sadb_msg_seq;
2244         km_policy_notify(NULL, 0, &c);
2245
2246         return 0;
2247 }
2248
2249 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2250                              struct sadb_msg *hdr, void **ext_hdrs);
2251 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2252         [SADB_RESERVED]         = pfkey_reserved,
2253         [SADB_GETSPI]           = pfkey_getspi,
2254         [SADB_UPDATE]           = pfkey_add,
2255         [SADB_ADD]              = pfkey_add,
2256         [SADB_DELETE]           = pfkey_delete,
2257         [SADB_GET]              = pfkey_get,
2258         [SADB_ACQUIRE]          = pfkey_acquire,
2259         [SADB_REGISTER]         = pfkey_register,
2260         [SADB_EXPIRE]           = NULL,
2261         [SADB_FLUSH]            = pfkey_flush,
2262         [SADB_DUMP]             = pfkey_dump,
2263         [SADB_X_PROMISC]        = pfkey_promisc,
2264         [SADB_X_PCHANGE]        = NULL,
2265         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2266         [SADB_X_SPDADD]         = pfkey_spdadd,
2267         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2268         [SADB_X_SPDGET]         = pfkey_spdget,
2269         [SADB_X_SPDACQUIRE]     = NULL,
2270         [SADB_X_SPDDUMP]        = pfkey_spddump,
2271         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2272         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2273         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2274 };
2275
2276 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2277 {
2278         void *ext_hdrs[SADB_EXT_MAX];
2279         int err;
2280
2281         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2282                         BROADCAST_PROMISC_ONLY, NULL);
2283
2284         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2285         err = parse_exthdrs(skb, hdr, ext_hdrs);
2286         if (!err) {
2287                 err = -EOPNOTSUPP;
2288                 if (pfkey_funcs[hdr->sadb_msg_type])
2289                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2290         }
2291         return err;
2292 }
2293
2294 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2295 {
2296         struct sadb_msg *hdr = NULL;
2297
2298         if (skb->len < sizeof(*hdr)) {
2299                 *errp = -EMSGSIZE;
2300         } else {
2301                 hdr = (struct sadb_msg *) skb->data;
2302                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2303                     hdr->sadb_msg_reserved != 0 ||
2304                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2305                      hdr->sadb_msg_type > SADB_MAX)) {
2306                         hdr = NULL;
2307                         *errp = -EINVAL;
2308                 } else if (hdr->sadb_msg_len != (skb->len /
2309                                                  sizeof(uint64_t)) ||
2310                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2311                                                 sizeof(uint64_t))) {
2312                         hdr = NULL;
2313                         *errp = -EMSGSIZE;
2314                 } else {
2315                         *errp = 0;
2316                 }
2317         }
2318         return hdr;
2319 }
2320
2321 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2322 {
2323         return t->aalgos & (1 << d->desc.sadb_alg_id);
2324 }
2325
2326 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2327 {
2328         return t->ealgos & (1 << d->desc.sadb_alg_id);
2329 }
2330
2331 static int count_ah_combs(struct xfrm_tmpl *t)
2332 {
2333         int i, sz = 0;
2334
2335         for (i = 0; ; i++) {
2336                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2337                 if (!aalg)
2338                         break;
2339                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2340                         sz += sizeof(struct sadb_comb);
2341         }
2342         return sz + sizeof(struct sadb_prop);
2343 }
2344
2345 static int count_esp_combs(struct xfrm_tmpl *t)
2346 {
2347         int i, k, sz = 0;
2348
2349         for (i = 0; ; i++) {
2350                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2351                 if (!ealg)
2352                         break;
2353
2354                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2355                         continue;
2356
2357                 for (k = 1; ; k++) {
2358                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2359                         if (!aalg)
2360                                 break;
2361
2362                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2363                                 sz += sizeof(struct sadb_comb);
2364                 }
2365         }
2366         return sz + sizeof(struct sadb_prop);
2367 }
2368
2369 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2370 {
2371         struct sadb_prop *p;
2372         int i;
2373
2374         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2375         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2376         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2377         p->sadb_prop_replay = 32;
2378         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2379
2380         for (i = 0; ; i++) {
2381                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2382                 if (!aalg)
2383                         break;
2384
2385                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2386                         struct sadb_comb *c;
2387                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2388                         memset(c, 0, sizeof(*c));
2389                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2390                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2391                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2392                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2393                         c->sadb_comb_hard_addtime = 24*60*60;
2394                         c->sadb_comb_soft_addtime = 20*60*60;
2395                         c->sadb_comb_hard_usetime = 8*60*60;
2396                         c->sadb_comb_soft_usetime = 7*60*60;
2397                 }
2398         }
2399 }
2400
2401 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2402 {
2403         struct sadb_prop *p;
2404         int i, k;
2405
2406         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2407         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2408         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2409         p->sadb_prop_replay = 32;
2410         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2411
2412         for (i=0; ; i++) {
2413                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2414                 if (!ealg)
2415                         break;
2416
2417                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2418                         continue;
2419
2420                 for (k = 1; ; k++) {
2421                         struct sadb_comb *c;
2422                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2423                         if (!aalg)
2424                                 break;
2425                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2426                                 continue;
2427                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2428                         memset(c, 0, sizeof(*c));
2429                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2430                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2431                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2432                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2433                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2434                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2435                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2436                         c->sadb_comb_hard_addtime = 24*60*60;
2437                         c->sadb_comb_soft_addtime = 20*60*60;
2438                         c->sadb_comb_hard_usetime = 8*60*60;
2439                         c->sadb_comb_soft_usetime = 7*60*60;
2440                 }
2441         }
2442 }
2443
2444 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2445 {
2446         return 0;
2447 }
2448
2449 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2450 {
2451         struct sk_buff *out_skb;
2452         struct sadb_msg *out_hdr;
2453         int hard;
2454         int hsc;
2455
2456         hard = c->data.hard;
2457         if (hard)
2458                 hsc = 2;
2459         else
2460                 hsc = 1;
2461
2462         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2463         if (IS_ERR(out_skb))
2464                 return PTR_ERR(out_skb);
2465
2466         out_hdr = (struct sadb_msg *) out_skb->data;
2467         out_hdr->sadb_msg_version = PF_KEY_V2;
2468         out_hdr->sadb_msg_type = SADB_EXPIRE;
2469         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2470         out_hdr->sadb_msg_errno = 0;
2471         out_hdr->sadb_msg_reserved = 0;
2472         out_hdr->sadb_msg_seq = 0;
2473         out_hdr->sadb_msg_pid = 0;
2474
2475         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2476         return 0;
2477 }
2478
2479 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2480 {
2481         switch (c->event) {
2482         case XFRM_SAP_EXPIRED:
2483                 return key_notify_sa_expire(x, c);
2484         case XFRM_SAP_DELETED:
2485         case XFRM_SAP_ADDED:
2486         case XFRM_SAP_UPDATED:
2487                 return key_notify_sa(x, c);
2488         case XFRM_SAP_FLUSHED:
2489                 return key_notify_sa_flush(c);
2490         default:
2491                 printk("pfkey: Unknown SA event %d\n", c->event);
2492                 break;
2493         }
2494
2495         return 0;
2496 }
2497
2498 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2499 {
2500         switch (c->event) {
2501         case XFRM_SAP_EXPIRED:
2502                 return key_notify_policy_expire(xp, c);
2503         case XFRM_SAP_DELETED:
2504         case XFRM_SAP_ADDED:
2505         case XFRM_SAP_UPDATED:
2506                 return key_notify_policy(xp, dir, c);
2507         case XFRM_SAP_FLUSHED:
2508                 return key_notify_policy_flush(c);
2509         default:
2510                 printk("pfkey: Unknown policy event %d\n", c->event);
2511                 break;
2512         }
2513
2514         return 0;
2515 }
2516
2517 static u32 get_acqseq(void)
2518 {
2519         u32 res;
2520         static u32 acqseq;
2521         static DEFINE_SPINLOCK(acqseq_lock);
2522
2523         spin_lock_bh(&acqseq_lock);
2524         res = (++acqseq ? : ++acqseq);
2525         spin_unlock_bh(&acqseq_lock);
2526         return res;
2527 }
2528
2529 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2530 {
2531         struct sk_buff *skb;
2532         struct sadb_msg *hdr;
2533         struct sadb_address *addr;
2534         struct sadb_x_policy *pol;
2535         struct sockaddr_in *sin;
2536 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2537         struct sockaddr_in6 *sin6;
2538 #endif
2539         int sockaddr_size;
2540         int size;
2541
2542         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2543         if (!sockaddr_size)
2544                 return -EINVAL;
2545
2546         size = sizeof(struct sadb_msg) +
2547                 (sizeof(struct sadb_address) * 2) +
2548                 (sockaddr_size * 2) +
2549                 sizeof(struct sadb_x_policy);
2550
2551         if (x->id.proto == IPPROTO_AH)
2552                 size += count_ah_combs(t);
2553         else if (x->id.proto == IPPROTO_ESP)
2554                 size += count_esp_combs(t);
2555
2556         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2557         if (skb == NULL)
2558                 return -ENOMEM;
2559
2560         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2561         hdr->sadb_msg_version = PF_KEY_V2;
2562         hdr->sadb_msg_type = SADB_ACQUIRE;
2563         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2564         hdr->sadb_msg_len = size / sizeof(uint64_t);
2565         hdr->sadb_msg_errno = 0;
2566         hdr->sadb_msg_reserved = 0;
2567         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2568         hdr->sadb_msg_pid = 0;
2569
2570         /* src address */
2571         addr = (struct sadb_address*) skb_put(skb,
2572                                               sizeof(struct sadb_address)+sockaddr_size);
2573         addr->sadb_address_len =
2574                 (sizeof(struct sadb_address)+sockaddr_size)/
2575                         sizeof(uint64_t);
2576         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2577         addr->sadb_address_proto = 0;
2578         addr->sadb_address_reserved = 0;
2579         if (x->props.family == AF_INET) {
2580                 addr->sadb_address_prefixlen = 32;
2581
2582                 sin = (struct sockaddr_in *) (addr + 1);
2583                 sin->sin_family = AF_INET;
2584                 sin->sin_addr.s_addr = x->props.saddr.a4;
2585                 sin->sin_port = 0;
2586                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2587         }
2588 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2589         else if (x->props.family == AF_INET6) {
2590                 addr->sadb_address_prefixlen = 128;
2591
2592                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2593                 sin6->sin6_family = AF_INET6;
2594                 sin6->sin6_port = 0;
2595                 sin6->sin6_flowinfo = 0;
2596                 memcpy(&sin6->sin6_addr,
2597                        x->props.saddr.a6, sizeof(struct in6_addr));
2598                 sin6->sin6_scope_id = 0;
2599         }
2600 #endif
2601         else
2602                 BUG();
2603
2604         /* dst address */
2605         addr = (struct sadb_address*) skb_put(skb,
2606                                               sizeof(struct sadb_address)+sockaddr_size);
2607         addr->sadb_address_len =
2608                 (sizeof(struct sadb_address)+sockaddr_size)/
2609                         sizeof(uint64_t);
2610         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2611         addr->sadb_address_proto = 0;
2612         addr->sadb_address_reserved = 0;
2613         if (x->props.family == AF_INET) {
2614                 addr->sadb_address_prefixlen = 32;
2615
2616                 sin = (struct sockaddr_in *) (addr + 1);
2617                 sin->sin_family = AF_INET;
2618                 sin->sin_addr.s_addr = x->id.daddr.a4;
2619                 sin->sin_port = 0;
2620                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2621         }
2622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2623         else if (x->props.family == AF_INET6) {
2624                 addr->sadb_address_prefixlen = 128;
2625
2626                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2627                 sin6->sin6_family = AF_INET6;
2628                 sin6->sin6_port = 0;
2629                 sin6->sin6_flowinfo = 0;
2630                 memcpy(&sin6->sin6_addr,
2631                        x->id.daddr.a6, sizeof(struct in6_addr));
2632                 sin6->sin6_scope_id = 0;
2633         }
2634 #endif
2635         else
2636                 BUG();
2637
2638         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2639         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2640         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2641         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2642         pol->sadb_x_policy_dir = dir+1;
2643         pol->sadb_x_policy_id = xp->index;
2644
2645         /* Set sadb_comb's. */
2646         if (x->id.proto == IPPROTO_AH)
2647                 dump_ah_combs(skb, t);
2648         else if (x->id.proto == IPPROTO_ESP)
2649                 dump_esp_combs(skb, t);
2650
2651         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2652 }
2653
2654 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2655                                                 u8 *data, int len, int *dir)
2656 {
2657         struct xfrm_policy *xp;
2658         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2659
2660         switch (family) {
2661         case AF_INET:
2662                 if (opt != IP_IPSEC_POLICY) {
2663                         *dir = -EOPNOTSUPP;
2664                         return NULL;
2665                 }
2666                 break;
2667 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2668         case AF_INET6:
2669                 if (opt != IPV6_IPSEC_POLICY) {
2670                         *dir = -EOPNOTSUPP;
2671                         return NULL;
2672                 }
2673                 break;
2674 #endif
2675         default:
2676                 *dir = -EINVAL;
2677                 return NULL;
2678         }
2679
2680         *dir = -EINVAL;
2681
2682         if (len < sizeof(struct sadb_x_policy) ||
2683             pol->sadb_x_policy_len*8 > len ||
2684             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2685             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2686                 return NULL;
2687
2688         xp = xfrm_policy_alloc(GFP_ATOMIC);
2689         if (xp == NULL) {
2690                 *dir = -ENOBUFS;
2691                 return NULL;
2692         }
2693
2694         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2695                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2696
2697         xp->lft.soft_byte_limit = XFRM_INF;
2698         xp->lft.hard_byte_limit = XFRM_INF;
2699         xp->lft.soft_packet_limit = XFRM_INF;
2700         xp->lft.hard_packet_limit = XFRM_INF;
2701         xp->family = family;
2702
2703         xp->xfrm_nr = 0;
2704         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2705             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2706                 goto out;
2707
2708         *dir = pol->sadb_x_policy_dir-1;
2709         return xp;
2710
2711 out:
2712         kfree(xp);
2713         return NULL;
2714 }
2715
2716 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2717 {
2718         struct sk_buff *skb;
2719         struct sadb_msg *hdr;
2720         struct sadb_sa *sa;
2721         struct sadb_address *addr;
2722         struct sadb_x_nat_t_port *n_port;
2723         struct sockaddr_in *sin;
2724 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2725         struct sockaddr_in6 *sin6;
2726 #endif
2727         int sockaddr_size;
2728         int size;
2729         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2730         struct xfrm_encap_tmpl *natt = NULL;
2731
2732         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2733         if (!sockaddr_size)
2734                 return -EINVAL;
2735
2736         if (!satype)
2737                 return -EINVAL;
2738
2739         if (!x->encap)
2740                 return -EINVAL;
2741
2742         natt = x->encap;
2743
2744         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2745          *
2746          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2747          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2748          */
2749
2750         size = sizeof(struct sadb_msg) +
2751                 sizeof(struct sadb_sa) +
2752                 (sizeof(struct sadb_address) * 2) +
2753                 (sockaddr_size * 2) +
2754                 (sizeof(struct sadb_x_nat_t_port) * 2);
2755
2756         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2757         if (skb == NULL)
2758                 return -ENOMEM;
2759
2760         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2761         hdr->sadb_msg_version = PF_KEY_V2;
2762         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2763         hdr->sadb_msg_satype = satype;
2764         hdr->sadb_msg_len = size / sizeof(uint64_t);
2765         hdr->sadb_msg_errno = 0;
2766         hdr->sadb_msg_reserved = 0;
2767         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2768         hdr->sadb_msg_pid = 0;
2769
2770         /* SA */
2771         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2772         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2773         sa->sadb_sa_exttype = SADB_EXT_SA;
2774         sa->sadb_sa_spi = x->id.spi;
2775         sa->sadb_sa_replay = 0;
2776         sa->sadb_sa_state = 0;
2777         sa->sadb_sa_auth = 0;
2778         sa->sadb_sa_encrypt = 0;
2779         sa->sadb_sa_flags = 0;
2780
2781         /* ADDRESS_SRC (old addr) */
2782         addr = (struct sadb_address*)
2783                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2784         addr->sadb_address_len =
2785                 (sizeof(struct sadb_address)+sockaddr_size)/
2786                         sizeof(uint64_t);
2787         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2788         addr->sadb_address_proto = 0;
2789         addr->sadb_address_reserved = 0;
2790         if (x->props.family == AF_INET) {
2791                 addr->sadb_address_prefixlen = 32;
2792
2793                 sin = (struct sockaddr_in *) (addr + 1);
2794                 sin->sin_family = AF_INET;
2795                 sin->sin_addr.s_addr = x->props.saddr.a4;
2796                 sin->sin_port = 0;
2797                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2798         }
2799 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2800         else if (x->props.family == AF_INET6) {
2801                 addr->sadb_address_prefixlen = 128;
2802
2803                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2804                 sin6->sin6_family = AF_INET6;
2805                 sin6->sin6_port = 0;
2806                 sin6->sin6_flowinfo = 0;
2807                 memcpy(&sin6->sin6_addr,
2808                        x->props.saddr.a6, sizeof(struct in6_addr));
2809                 sin6->sin6_scope_id = 0;
2810         }
2811 #endif
2812         else
2813                 BUG();
2814
2815         /* NAT_T_SPORT (old port) */
2816         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2817         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2818         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2819         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2820         n_port->sadb_x_nat_t_port_reserved = 0;
2821
2822         /* ADDRESS_DST (new addr) */
2823         addr = (struct sadb_address*)
2824                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2825         addr->sadb_address_len =
2826                 (sizeof(struct sadb_address)+sockaddr_size)/
2827                         sizeof(uint64_t);
2828         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2829         addr->sadb_address_proto = 0;
2830         addr->sadb_address_reserved = 0;
2831         if (x->props.family == AF_INET) {
2832                 addr->sadb_address_prefixlen = 32;
2833
2834                 sin = (struct sockaddr_in *) (addr + 1);
2835                 sin->sin_family = AF_INET;
2836                 sin->sin_addr.s_addr = ipaddr->a4;
2837                 sin->sin_port = 0;
2838                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2839         }
2840 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2841         else if (x->props.family == AF_INET6) {
2842                 addr->sadb_address_prefixlen = 128;
2843
2844                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2845                 sin6->sin6_family = AF_INET6;
2846                 sin6->sin6_port = 0;
2847                 sin6->sin6_flowinfo = 0;
2848                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2849                 sin6->sin6_scope_id = 0;
2850         }
2851 #endif
2852         else
2853                 BUG();
2854
2855         /* NAT_T_DPORT (new port) */
2856         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2857         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2858         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2859         n_port->sadb_x_nat_t_port_port = sport;
2860         n_port->sadb_x_nat_t_port_reserved = 0;
2861
2862         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2863 }
2864
2865 static int pfkey_sendmsg(struct kiocb *kiocb,
2866                          struct socket *sock, struct msghdr *msg, size_t len)
2867 {
2868         struct sock *sk = sock->sk;
2869         struct sk_buff *skb = NULL;
2870         struct sadb_msg *hdr = NULL;
2871         int err;
2872
2873         err = -EOPNOTSUPP;
2874         if (msg->msg_flags & MSG_OOB)
2875                 goto out;
2876
2877         err = -EMSGSIZE;
2878         if ((unsigned)len > sk->sk_sndbuf - 32)
2879                 goto out;
2880
2881         err = -ENOBUFS;
2882         skb = alloc_skb(len, GFP_KERNEL);
2883         if (skb == NULL)
2884                 goto out;
2885
2886         err = -EFAULT;
2887         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2888                 goto out;
2889
2890         hdr = pfkey_get_base_msg(skb, &err);
2891         if (!hdr)
2892                 goto out;
2893
2894         down(&xfrm_cfg_sem);
2895         err = pfkey_process(sk, skb, hdr);
2896         up(&xfrm_cfg_sem);
2897
2898 out:
2899         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2900                 err = 0;
2901         if (skb)
2902                 kfree_skb(skb);
2903
2904         return err ? : len;
2905 }
2906
2907 static int pfkey_recvmsg(struct kiocb *kiocb,
2908                          struct socket *sock, struct msghdr *msg, size_t len,
2909                          int flags)
2910 {
2911         struct sock *sk = sock->sk;
2912         struct sk_buff *skb;
2913         int copied, err;
2914
2915         err = -EINVAL;
2916         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2917                 goto out;
2918
2919         msg->msg_namelen = 0;
2920         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2921         if (skb == NULL)
2922                 goto out;
2923
2924         copied = skb->len;
2925         if (copied > len) {
2926                 msg->msg_flags |= MSG_TRUNC;
2927                 copied = len;
2928         }
2929
2930         skb->h.raw = skb->data;
2931         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2932         if (err)
2933                 goto out_free;
2934
2935         sock_recv_timestamp(msg, sk, skb);
2936
2937         err = (flags & MSG_TRUNC) ? skb->len : copied;
2938
2939 out_free:
2940         skb_free_datagram(sk, skb);
2941 out:
2942         return err;
2943 }
2944
2945 static struct proto_ops pfkey_ops = {
2946         .family         =       PF_KEY,
2947         .owner          =       THIS_MODULE,
2948         /* Operations that make no sense on pfkey sockets. */
2949         .bind           =       sock_no_bind,
2950         .connect        =       sock_no_connect,
2951         .socketpair     =       sock_no_socketpair,
2952         .accept         =       sock_no_accept,
2953         .getname        =       sock_no_getname,
2954         .ioctl          =       sock_no_ioctl,
2955         .listen         =       sock_no_listen,
2956         .shutdown       =       sock_no_shutdown,
2957         .setsockopt     =       sock_no_setsockopt,
2958         .getsockopt     =       sock_no_getsockopt,
2959         .mmap           =       sock_no_mmap,
2960         .sendpage       =       sock_no_sendpage,
2961
2962         /* Now the operations that really occur. */
2963         .release        =       pfkey_release,
2964         .poll           =       datagram_poll,
2965         .sendmsg        =       pfkey_sendmsg,
2966         .recvmsg        =       pfkey_recvmsg,
2967 };
2968
2969 static struct net_proto_family pfkey_family_ops = {
2970         .family =       PF_KEY,
2971         .create =       pfkey_create,
2972         .owner  =       THIS_MODULE,
2973 };
2974
2975 #ifdef CONFIG_PROC_FS
2976 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2977                            int length, int *eof, void *data)
2978 {
2979         off_t pos = 0;
2980         off_t begin = 0;
2981         int len = 0;
2982         struct sock *s;
2983         struct hlist_node *node;
2984
2985         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
2986
2987         read_lock(&pfkey_table_lock);
2988
2989         sk_for_each(s, node, &pfkey_table) {
2990                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2991                                s,
2992                                atomic_read(&s->sk_refcnt),
2993                                atomic_read(&s->sk_rmem_alloc),
2994                                atomic_read(&s->sk_wmem_alloc),
2995                                sock_i_uid(s),
2996                                sock_i_ino(s)
2997                                );
2998
2999                 buffer[len++] = '\n';
3000
3001                 pos = begin + len;
3002                 if (pos < offset) {
3003                         len = 0;
3004                         begin = pos;
3005                 }
3006                 if(pos > offset + length)
3007                         goto done;
3008         }
3009         *eof = 1;
3010
3011 done:
3012         read_unlock(&pfkey_table_lock);
3013
3014         *start = buffer + (offset - begin);
3015         len -= (offset - begin);
3016
3017         if (len > length)
3018                 len = length;
3019         if (len < 0)
3020                 len = 0;
3021
3022         return len;
3023 }
3024 #endif
3025
3026 static struct xfrm_mgr pfkeyv2_mgr =
3027 {
3028         .id             = "pfkeyv2",
3029         .notify         = pfkey_send_notify,
3030         .acquire        = pfkey_send_acquire,
3031         .compile_policy = pfkey_compile_policy,
3032         .new_mapping    = pfkey_send_new_mapping,
3033         .notify_policy  = pfkey_send_policy_notify,
3034 };
3035
3036 static void __exit ipsec_pfkey_exit(void)
3037 {
3038         xfrm_unregister_km(&pfkeyv2_mgr);
3039         remove_proc_entry("net/pfkey", NULL);
3040         sock_unregister(PF_KEY);
3041         proto_unregister(&key_proto);
3042 }
3043
3044 static int __init ipsec_pfkey_init(void)
3045 {
3046         int err = proto_register(&key_proto, 0);
3047
3048         if (err != 0)
3049                 goto out;
3050
3051         err = sock_register(&pfkey_family_ops);
3052         if (err != 0)
3053                 goto out_unregister_key_proto;
3054 #ifdef CONFIG_PROC_FS
3055         err = -ENOMEM;
3056         if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3057                 goto out_sock_unregister;
3058 #endif
3059         err = xfrm_register_km(&pfkeyv2_mgr);
3060         if (err != 0)
3061                 goto out_remove_proc_entry;
3062 out:
3063         return err;
3064 out_remove_proc_entry:
3065 #ifdef CONFIG_PROC_FS
3066         remove_proc_entry("net/pfkey", NULL);
3067 out_sock_unregister:
3068 #endif
3069         sock_unregister(PF_KEY);
3070 out_unregister_key_proto:
3071         proto_unregister(&key_proto);
3072         goto out;
3073 }
3074
3075 module_init(ipsec_pfkey_init);
3076 module_exit(ipsec_pfkey_exit);
3077 MODULE_LICENSE("GPL");
3078 MODULE_ALIAS_NETPROTO(PF_KEY);