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