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   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/socket.h>
  21 #include <linux/pfkeyv2.h>
  22 #include <linux/ipsec.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/rtnetlink.h>
  25 #include <linux/in.h>
  26 #include <linux/in6.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/init.h>
  29 #include <net/xfrm.h>
  30
  31 #include <net/sock.h>
  32
  33 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  34 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  35
  36
  37 /* List of all pfkey sockets. */
  38 static HLIST_HEAD(pfkey_table);
  39 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  40 static DEFINE_RWLOCK(pfkey_table_lock);
  41 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
  42
  43 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
  44
  45 struct pfkey_sock {
  46         /* struct sock must be the first member of struct pfkey_sock */
  47         struct sock     sk;
  48         int             registered;
  49         int             promisc;
  50 };
  51
  52 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  53 {
  54         return (struct pfkey_sock *)sk;
  55 }
  56
  57 static void pfkey_sock_destruct(struct sock *sk)
  58 {
  59         skb_queue_purge(&sk->sk_receive_queue);
  60
  61         if (!sock_flag(sk, SOCK_DEAD)) {
  62                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  63                 return;
  64         }
  65
  66         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
  67         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
  68
  69         atomic_dec(&pfkey_socks_nr);
  70 }
  71
  72 static void pfkey_table_grab(void)
  73 {
  74         write_lock_bh(&pfkey_table_lock);
  75
  76         if (atomic_read(&pfkey_table_users)) {
  77                 DECLARE_WAITQUEUE(wait, current);
  78
  79                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
  80                 for(;;) {
  81                         set_current_state(TASK_UNINTERRUPTIBLE);
  82                         if (atomic_read(&pfkey_table_users) == 0)
  83                                 break;
  84                         write_unlock_bh(&pfkey_table_lock);
  85                         schedule();
  86                         write_lock_bh(&pfkey_table_lock);
  87                 }
  88
  89                 __set_current_state(TASK_RUNNING);
  90                 remove_wait_queue(&pfkey_table_wait, &wait);
  91         }
  92 }
  93
  94 static __inline__ void pfkey_table_ungrab(void)
  95 {
  96         write_unlock_bh(&pfkey_table_lock);
  97         wake_up(&pfkey_table_wait);
  98 }
  99
 100 static __inline__ void pfkey_lock_table(void)
 101 {
 102         /* read_lock() synchronizes us to pfkey_table_grab */
 103
 104         read_lock(&pfkey_table_lock);
 105         atomic_inc(&pfkey_table_users);
 106         read_unlock(&pfkey_table_lock);
 107 }
 108
 109 static __inline__ void pfkey_unlock_table(void)
 110 {
 111         if (atomic_dec_and_test(&pfkey_table_users))
 112                 wake_up(&pfkey_table_wait);
 113 }
 114
 115
 116 static struct proto_ops pfkey_ops;
 117
 118 static void pfkey_insert(struct sock *sk)
 119 {
 120         pfkey_table_grab();
 121         sk_add_node(sk, &pfkey_table);
 122         pfkey_table_ungrab();
 123 }
 124
 125 static void pfkey_remove(struct sock *sk)
 126 {
 127         pfkey_table_grab();
 128         sk_del_node_init(sk);
 129         pfkey_table_ungrab();
 130 }
 131
 132 static struct proto key_proto = {
 133         .name     = "KEY",
 134         .owner    = THIS_MODULE,
 135         .obj_size = sizeof(struct pfkey_sock),
 136 };
 137
 138 static int pfkey_create(struct socket *sock, int protocol)
 139 {
 140         struct sock *sk;
 141         int err;
 142
 143         if (!capable(CAP_NET_ADMIN))
 144                 return -EPERM;
 145         if (sock->type != SOCK_RAW)
 146                 return -ESOCKTNOSUPPORT;
 147         if (protocol != PF_KEY_V2)
 148                 return -EPROTONOSUPPORT;
 149
 150         err = -ENOMEM;
 151         sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1);
 152         if (sk == NULL)
 153                 goto out;
 154
 155         sock->ops = &pfkey_ops;
 156         sock_init_data(sock, sk);
 157
 158         sk->sk_family = PF_KEY;
 159         sk->sk_destruct = pfkey_sock_destruct;
 160
 161         atomic_inc(&pfkey_socks_nr);
 162
 163         pfkey_insert(sk);
 164
 165         return 0;
 166 out:
 167         return err;
 168 }
 169
 170 static int pfkey_release(struct socket *sock)
 171 {
 172         struct sock *sk = sock->sk;
 173
 174         if (!sk)
 175                 return 0;
 176
 177         pfkey_remove(sk);
 178
 179         sock_orphan(sk);
 180         sock->sk = NULL;
 181         skb_queue_purge(&sk->sk_write_queue);
 182         sock_put(sk);
 183
 184         return 0;
 185 }
 186
 187 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 188                                int allocation, struct sock *sk)
 189 {
 190         int err = -ENOBUFS;
 191
 192         sock_hold(sk);
 193         if (*skb2 == NULL) {
 194                 if (atomic_read(&skb->users) != 1) {
 195                         *skb2 = skb_clone(skb, allocation);
 196                 } else {
 197                         *skb2 = skb;
 198                         atomic_inc(&skb->users);
 199                 }
 200         }
 201         if (*skb2 != NULL) {
 202                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 203                         skb_orphan(*skb2);
 204                         skb_set_owner_r(*skb2, sk);
 205                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 206                         sk->sk_data_ready(sk, (*skb2)->len);
 207                         *skb2 = NULL;
 208                         err = 0;
 209                 }
 210         }
 211         sock_put(sk);
 212         return err;
 213 }
 214
 215 /* Send SKB to all pfkey sockets matching selected criteria.  */
 216 #define BROADCAST_ALL           0
 217 #define BROADCAST_ONE           1
 218 #define BROADCAST_REGISTERED    2
 219 #define BROADCAST_PROMISC_ONLY  4
 220 static int pfkey_broadcast(struct sk_buff *skb, int allocation,
 221                            int broadcast_flags, struct sock *one_sk)
 222 {
 223         struct sock *sk;
 224         struct hlist_node *node;
 225         struct sk_buff *skb2 = NULL;
 226         int err = -ESRCH;
 227
 228         /* XXX Do we need something like netlink_overrun?  I think
 229          * XXX PF_KEY socket apps will not mind current behavior.
 230          */
 231         if (!skb)
 232                 return -ENOMEM;
 233
 234         pfkey_lock_table();
 235         sk_for_each(sk, node, &pfkey_table) {
 236                 struct pfkey_sock *pfk = pfkey_sk(sk);
 237                 int err2;
 238
 239                 /* Yes, it means that if you are meant to receive this
 240                  * pfkey message you receive it twice as promiscuous
 241                  * socket.
 242                  */
 243                 if (pfk->promisc)
 244                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 245
 246                 /* the exact target will be processed later */
 247                 if (sk == one_sk)
 248                         continue;
 249                 if (broadcast_flags != BROADCAST_ALL) {
 250                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 251                                 continue;
 252                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 253                             !pfk->registered)
 254                                 continue;
 255                         if (broadcast_flags & BROADCAST_ONE)
 256                                 continue;
 257                 }
 258
 259                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 260
 261                 /* Error is cleare after succecful sending to at least one
 262                  * registered KM */
 263                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 264                         err = err2;
 265         }
 266         pfkey_unlock_table();
 267
 268         if (one_sk != NULL)
 269                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 270
 271         if (skb2)
 272                 kfree_skb(skb2);
 273         kfree_skb(skb);
 274         return err;
 275 }
 276
 277 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 278 {
 279         *new = *orig;
 280 }
 281
 282 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 283 {
 284         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 285         struct sadb_msg *hdr;
 286
 287         if (!skb)
 288                 return -ENOBUFS;
 289
 290         /* Woe be to the platform trying to support PFKEY yet
 291          * having normal errnos outside the 1-255 range, inclusive.
 292          */
 293         err = -err;
 294         if (err == ERESTARTSYS ||
 295             err == ERESTARTNOHAND ||
 296             err == ERESTARTNOINTR)
 297                 err = EINTR;
 298         if (err >= 512)
 299                 err = EINVAL;
 300         if (err <= 0 || err >= 256)
 301                 BUG();
 302
 303         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 304         pfkey_hdr_dup(hdr, orig);
 305         hdr->sadb_msg_errno = (uint8_t) err;
 306         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 307                              sizeof(uint64_t));
 308
 309         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 310
 311         return 0;
 312 }
 313
 314 static u8 sadb_ext_min_len[] = {
 315         [SADB_EXT_RESERVED]             = (u8) 0,
 316         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 317         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 318         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 319         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 320         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 321         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 322         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 323         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 324         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 325         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 326         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 327         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 328         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 329         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 330         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 331         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 332         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 333         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 334         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 335         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 336         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 337         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 338         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 339 };
 340
 341 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 342 static int verify_address_len(void *p)
 343 {
 344         struct sadb_address *sp = p;
 345         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 346         struct sockaddr_in *sin;
 347 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 348         struct sockaddr_in6 *sin6;
 349 #endif
 350         int len;
 351
 352         switch (addr->sa_family) {
 353         case AF_INET:
 354                 len  = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1);
 355                 len /= sizeof(uint64_t);
 356                 if (sp->sadb_address_len != len ||
 357                     sp->sadb_address_prefixlen > 32)
 358                         return -EINVAL;
 359                 break;
 360 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 361         case AF_INET6:
 362                 len  = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1);
 363                 len /= sizeof(uint64_t);
 364                 if (sp->sadb_address_len != len ||
 365                     sp->sadb_address_prefixlen > 128)
 366                         return -EINVAL;
 367                 break;
 368 #endif
 369         default:
 370                 /* It is user using kernel to keep track of security
 371                  * associations for another protocol, such as
 372                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 373                  * lengths.
 374                  *
 375                  * XXX Actually, association/policy database is not yet
 376                  * XXX able to cope with arbitrary sockaddr families.
 377                  * XXX When it can, remove this -EINVAL.  -DaveM
 378                  */
 379                 return -EINVAL;
 380                 break;
 381         };
 382
 383         return 0;
 384 }
 385
 386 static int present_and_same_family(struct sadb_address *src,
 387                                    struct sadb_address *dst)
 388 {
 389         struct sockaddr *s_addr, *d_addr;
 390
 391         if (!src || !dst)
 392                 return 0;
 393
 394         s_addr = (struct sockaddr *)(src + 1);
 395         d_addr = (struct sockaddr *)(dst + 1);
 396         if (s_addr->sa_family != d_addr->sa_family)
 397                 return 0;
 398         if (s_addr->sa_family != AF_INET
 399 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 400             && s_addr->sa_family != AF_INET6
 401 #endif
 402                 )
 403                 return 0;
 404
 405         return 1;
 406 }
 407
 408 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 409 {
 410         char *p = (char *) hdr;
 411         int len = skb->len;
 412
 413         len -= sizeof(*hdr);
 414         p += sizeof(*hdr);
 415         while (len > 0) {
 416                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 417                 uint16_t ext_type;
 418                 int ext_len;
 419
 420                 ext_len  = ehdr->sadb_ext_len;
 421                 ext_len *= sizeof(uint64_t);
 422                 ext_type = ehdr->sadb_ext_type;
 423                 if (ext_len < sizeof(uint64_t) ||
 424                     ext_len > len ||
 425                     ext_type == SADB_EXT_RESERVED)
 426                         return -EINVAL;
 427
 428                 if (ext_type <= SADB_EXT_MAX) {
 429                         int min = (int) sadb_ext_min_len[ext_type];
 430                         if (ext_len < min)
 431                                 return -EINVAL;
 432                         if (ext_hdrs[ext_type-1] != NULL)
 433                                 return -EINVAL;
 434                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 435                             ext_type == SADB_EXT_ADDRESS_DST ||
 436                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 437                             ext_type == SADB_X_EXT_NAT_T_OA) {
 438                                 if (verify_address_len(p))
 439                                         return -EINVAL;
 440                         }
 441                         ext_hdrs[ext_type-1] = p;
 442                 }
 443                 p   += ext_len;
 444                 len -= ext_len;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static uint16_t
 451 pfkey_satype2proto(uint8_t satype)
 452 {
 453         switch (satype) {
 454         case SADB_SATYPE_UNSPEC:
 455                 return IPSEC_PROTO_ANY;
 456         case SADB_SATYPE_AH:
 457                 return IPPROTO_AH;
 458         case SADB_SATYPE_ESP:
 459                 return IPPROTO_ESP;
 460         case SADB_X_SATYPE_IPCOMP:
 461                 return IPPROTO_COMP;
 462                 break;
 463         default:
 464                 return 0;
 465         }
 466         /* NOTREACHED */
 467 }
 468
 469 static uint8_t
 470 pfkey_proto2satype(uint16_t proto)
 471 {
 472         switch (proto) {
 473         case IPPROTO_AH:
 474                 return SADB_SATYPE_AH;
 475         case IPPROTO_ESP:
 476                 return SADB_SATYPE_ESP;
 477         case IPPROTO_COMP:
 478                 return SADB_X_SATYPE_IPCOMP;
 479                 break;
 480         default:
 481                 return 0;
 482         }
 483         /* NOTREACHED */
 484 }
 485
 486 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 487  * say specifically 'just raw sockets' as we encode them as 255.
 488  */
 489
 490 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 491 {
 492         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 493 }
 494
 495 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 496 {
 497         return (proto ? proto : IPSEC_PROTO_ANY);
 498 }
 499
 500 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 501                                      xfrm_address_t *xaddr)
 502 {
 503         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 504         case AF_INET:
 505                 xaddr->a4 =
 506                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 507                 return AF_INET;
 508 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 509         case AF_INET6:
 510                 memcpy(xaddr->a6,
 511                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 512                        sizeof(struct in6_addr));
 513                 return AF_INET6;
 514 #endif
 515         default:
 516                 return 0;
 517         }
 518         /* NOTREACHED */
 519 }
 520
 521 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 522 {
 523         struct sadb_sa *sa;
 524         struct sadb_address *addr;
 525         uint16_t proto;
 526         unsigned short family;
 527         xfrm_address_t *xaddr;
 528
 529         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 530         if (sa == NULL)
 531                 return NULL;
 532
 533         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 534         if (proto == 0)
 535                 return NULL;
 536
 537         /* sadb_address_len should be checked by caller */
 538         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 539         if (addr == NULL)
 540                 return NULL;
 541
 542         family = ((struct sockaddr *)(addr + 1))->sa_family;
 543         switch (family) {
 544         case AF_INET:
 545                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 546                 break;
 547 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 548         case AF_INET6:
 549                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 550                 break;
 551 #endif
 552         default:
 553                 xaddr = NULL;
 554         }
 555
 556         if (!xaddr)
 557                 return NULL;
 558
 559         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 560 }
 561
 562 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 563 static int
 564 pfkey_sockaddr_size(sa_family_t family)
 565 {
 566         switch (family) {
 567         case AF_INET:
 568                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
 569 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 570         case AF_INET6:
 571                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
 572 #endif
 573         default:
 574                 return 0;
 575         }
 576         /* NOTREACHED */
 577 }
 578
 579 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
 580 {
 581         struct sk_buff *skb;
 582         struct sadb_msg *hdr;
 583         struct sadb_sa *sa;
 584         struct sadb_lifetime *lifetime;
 585         struct sadb_address *addr;
 586         struct sadb_key *key;
 587         struct sadb_x_sa2 *sa2;
 588         struct sockaddr_in *sin;
 589 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 590         struct sockaddr_in6 *sin6;
 591 #endif
 592         int size;
 593         int auth_key_size = 0;
 594         int encrypt_key_size = 0;
 595         int sockaddr_size;
 596         struct xfrm_encap_tmpl *natt = NULL;
 597
 598         /* address family check */
 599         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 600         if (!sockaddr_size)
 601                 return ERR_PTR(-EINVAL);
 602
 603         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 604            key(AE), (identity(SD),) (sensitivity)> */
 605         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 606                 sizeof(struct sadb_lifetime) +
 607                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 608                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 609                         sizeof(struct sadb_address)*2 +
 610                                 sockaddr_size*2 +
 611                                         sizeof(struct sadb_x_sa2);
 612         /* identity & sensitivity */
 613
 614         if ((x->props.family == AF_INET &&
 615              x->sel.saddr.a4 != x->props.saddr.a4)
 616 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 617             || (x->props.family == AF_INET6 &&
 618                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 619 #endif
 620                 )
 621                 size += sizeof(struct sadb_address) + sockaddr_size;
 622
 623         if (add_keys) {
 624                 if (x->aalg && x->aalg->alg_key_len) {
 625                         auth_key_size =
 626                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 627                         size += sizeof(struct sadb_key) + auth_key_size;
 628                 }
 629                 if (x->ealg && x->ealg->alg_key_len) {
 630                         encrypt_key_size =
 631                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 632                         size += sizeof(struct sadb_key) + encrypt_key_size;
 633                 }
 634         }
 635         if (x->encap)
 636                 natt = x->encap;
 637
 638         if (natt && natt->encap_type) {
 639                 size += sizeof(struct sadb_x_nat_t_type);
 640                 size += sizeof(struct sadb_x_nat_t_port);
 641                 size += sizeof(struct sadb_x_nat_t_port);
 642         }
 643
 644         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 645         if (skb == NULL)
 646                 return ERR_PTR(-ENOBUFS);
 647
 648         /* call should fill header later */
 649         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 650         memset(hdr, 0, size);   /* XXX do we need this ? */
 651         hdr->sadb_msg_len = size / sizeof(uint64_t);
 652
 653         /* sa */
 654         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 655         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 656         sa->sadb_sa_exttype = SADB_EXT_SA;
 657         sa->sadb_sa_spi = x->id.spi;
 658         sa->sadb_sa_replay = x->props.replay_window;
 659         sa->sadb_sa_state = SADB_SASTATE_DYING;
 660         if (x->km.state == XFRM_STATE_VALID && !x->km.dying)
 661                 sa->sadb_sa_state = SADB_SASTATE_MATURE;
 662         else if (x->km.state == XFRM_STATE_ACQ)
 663                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 664         else if (x->km.state == XFRM_STATE_EXPIRED)
 665                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 666         sa->sadb_sa_auth = 0;
 667         if (x->aalg) {
 668                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 669                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 670         }
 671         sa->sadb_sa_encrypt = 0;
 672         BUG_ON(x->ealg && x->calg);
 673         if (x->ealg) {
 674                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 675                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 676         }
 677         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 678         if (x->calg) {
 679                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 680                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 681         }
 682
 683         sa->sadb_sa_flags = 0;
 684         if (x->props.flags & XFRM_STATE_NOECN)
 685                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 686         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 687                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 688
 689         /* hard time */
 690         if (hsc & 2) {
 691                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 692                                                              sizeof(struct sadb_lifetime));
 693                 lifetime->sadb_lifetime_len =
 694                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 695                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 696                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 697                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 698                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 699                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 700         }
 701         /* soft time */
 702         if (hsc & 1) {
 703                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 704                                                              sizeof(struct sadb_lifetime));
 705                 lifetime->sadb_lifetime_len =
 706                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 707                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 708                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 709                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 710                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 711                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 712         }
 713         /* current time */
 714         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 715                                                      sizeof(struct sadb_lifetime));
 716         lifetime->sadb_lifetime_len =
 717                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 718         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 719         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 720         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 721         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 722         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 723         /* src address */
 724         addr = (struct sadb_address*) skb_put(skb,
 725                                               sizeof(struct sadb_address)+sockaddr_size);
 726         addr->sadb_address_len =
 727                 (sizeof(struct sadb_address)+sockaddr_size)/
 728                         sizeof(uint64_t);
 729         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 730         /* "if the ports are non-zero, then the sadb_address_proto field,
 731            normally zero, MUST be filled in with the transport
 732            protocol's number." - RFC2367 */
 733         addr->sadb_address_proto = 0;
 734         addr->sadb_address_reserved = 0;
 735         if (x->props.family == AF_INET) {
 736                 addr->sadb_address_prefixlen = 32;
 737
 738                 sin = (struct sockaddr_in *) (addr + 1);
 739                 sin->sin_family = AF_INET;
 740                 sin->sin_addr.s_addr = x->props.saddr.a4;
 741                 sin->sin_port = 0;
 742                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 743         }
 744 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 745         else if (x->props.family == AF_INET6) {
 746                 addr->sadb_address_prefixlen = 128;
 747
 748                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 749                 sin6->sin6_family = AF_INET6;
 750                 sin6->sin6_port = 0;
 751                 sin6->sin6_flowinfo = 0;
 752                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 753                        sizeof(struct in6_addr));
 754                 sin6->sin6_scope_id = 0;
 755         }
 756 #endif
 757         else
 758                 BUG();
 759
 760         /* dst address */
 761         addr = (struct sadb_address*) skb_put(skb,
 762                                               sizeof(struct sadb_address)+sockaddr_size);
 763         addr->sadb_address_len =
 764                 (sizeof(struct sadb_address)+sockaddr_size)/
 765                         sizeof(uint64_t);
 766         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 767         addr->sadb_address_proto = 0;
 768         addr->sadb_address_prefixlen = 32; /* XXX */
 769         addr->sadb_address_reserved = 0;
 770         if (x->props.family == AF_INET) {
 771                 sin = (struct sockaddr_in *) (addr + 1);
 772                 sin->sin_family = AF_INET;
 773                 sin->sin_addr.s_addr = x->id.daddr.a4;
 774                 sin->sin_port = 0;
 775                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 776
 777                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 778                         addr = (struct sadb_address*) skb_put(skb,
 779                                 sizeof(struct sadb_address)+sockaddr_size);
 780                         addr->sadb_address_len =
 781                                 (sizeof(struct sadb_address)+sockaddr_size)/
 782                                 sizeof(uint64_t);
 783                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 784                         addr->sadb_address_proto =
 785                                 pfkey_proto_from_xfrm(x->sel.proto);
 786                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 787                         addr->sadb_address_reserved = 0;
 788
 789                         sin = (struct sockaddr_in *) (addr + 1);
 790                         sin->sin_family = AF_INET;
 791                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 792                         sin->sin_port = x->sel.sport;
 793                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 794                 }
 795         }
 796 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 797         else if (x->props.family == AF_INET6) {
 798                 addr->sadb_address_prefixlen = 128;
 799
 800                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 801                 sin6->sin6_family = AF_INET6;
 802                 sin6->sin6_port = 0;
 803                 sin6->sin6_flowinfo = 0;
 804                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 805                 sin6->sin6_scope_id = 0;
 806
 807                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 808                             sizeof(struct in6_addr))) {
 809                         addr = (struct sadb_address *) skb_put(skb,
 810                                 sizeof(struct sadb_address)+sockaddr_size);
 811                         addr->sadb_address_len =
 812                                 (sizeof(struct sadb_address)+sockaddr_size)/
 813                                 sizeof(uint64_t);
 814                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 815                         addr->sadb_address_proto =
 816                                 pfkey_proto_from_xfrm(x->sel.proto);
 817                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 818                         addr->sadb_address_reserved = 0;
 819
 820                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 821                         sin6->sin6_family = AF_INET6;
 822                         sin6->sin6_port = x->sel.sport;
 823                         sin6->sin6_flowinfo = 0;
 824                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 825                                sizeof(struct in6_addr));
 826                         sin6->sin6_scope_id = 0;
 827                 }
 828         }
 829 #endif
 830         else
 831                 BUG();
 832
 833         /* auth key */
 834         if (add_keys && auth_key_size) {
 835                 key = (struct sadb_key *) skb_put(skb,
 836                                                   sizeof(struct sadb_key)+auth_key_size);
 837                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 838                         sizeof(uint64_t);
 839                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 840                 key->sadb_key_bits = x->aalg->alg_key_len;
 841                 key->sadb_key_reserved = 0;
 842                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 843         }
 844         /* encrypt key */
 845         if (add_keys && encrypt_key_size) {
 846                 key = (struct sadb_key *) skb_put(skb,
 847                                                   sizeof(struct sadb_key)+encrypt_key_size);
 848                 key->sadb_key_len = (sizeof(struct sadb_key) +
 849                                      encrypt_key_size) / sizeof(uint64_t);
 850                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 851                 key->sadb_key_bits = x->ealg->alg_key_len;
 852                 key->sadb_key_reserved = 0;
 853                 memcpy(key + 1, x->ealg->alg_key,
 854                        (x->ealg->alg_key_len+7)/8);
 855         }
 856
 857         /* sa */
 858         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 859         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 860         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 861         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 862         sa2->sadb_x_sa2_reserved1 = 0;
 863         sa2->sadb_x_sa2_reserved2 = 0;
 864         sa2->sadb_x_sa2_sequence = 0;
 865         sa2->sadb_x_sa2_reqid = x->props.reqid;
 866
 867         if (natt && natt->encap_type) {
 868                 struct sadb_x_nat_t_type *n_type;
 869                 struct sadb_x_nat_t_port *n_port;
 870
 871                 /* type */
 872                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 873                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 874                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 875                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 876                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 877                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 878                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 879
 880                 /* source port */
 881                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 882                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 883                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 884                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 885                 n_port->sadb_x_nat_t_port_reserved = 0;
 886
 887                 /* dest port */
 888                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 889                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 890                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 891                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 892                 n_port->sadb_x_nat_t_port_reserved = 0;
 893         }
 894
 895         return skb;
 896 }
 897
 898 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 899                                                 void **ext_hdrs)
 900 {
 901         struct xfrm_state *x;
 902         struct sadb_lifetime *lifetime;
 903         struct sadb_sa *sa;
 904         struct sadb_key *key;
 905         uint16_t proto;
 906         int err;
 907
 908
 909         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 910         if (!sa ||
 911             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 912                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 913                 return ERR_PTR(-EINVAL);
 914         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
 915             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
 916                 return ERR_PTR(-EINVAL);
 917         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
 918             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
 919                 return ERR_PTR(-EINVAL);
 920         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
 921             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
 922                 return ERR_PTR(-EINVAL);
 923
 924         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 925         if (proto == 0)
 926                 return ERR_PTR(-EINVAL);
 927
 928         /* default error is no buffer space */
 929         err = -ENOBUFS;
 930
 931         /* RFC2367:
 932
 933    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
 934    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
 935    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
 936    Therefore, the sadb_sa_state field of all submitted SAs MUST be
 937    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
 938    not true.
 939
 940            However, KAME setkey always uses SADB_SASTATE_LARVAL.
 941            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
 942          */
 943         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
 944             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
 945              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
 946             sa->sadb_sa_encrypt > SADB_EALG_MAX)
 947                 return ERR_PTR(-EINVAL);
 948         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 949         if (key != NULL &&
 950             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
 951             ((key->sadb_key_bits+7) / 8 == 0 ||
 952              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 953                 return ERR_PTR(-EINVAL);
 954         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
 955         if (key != NULL &&
 956             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
 957             ((key->sadb_key_bits+7) / 8 == 0 ||
 958              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
 959                 return ERR_PTR(-EINVAL);
 960
 961         x = xfrm_state_alloc();
 962         if (x == NULL)
 963                 return ERR_PTR(-ENOBUFS);
 964
 965         x->id.proto = proto;
 966         x->id.spi = sa->sadb_sa_spi;
 967         x->props.replay_window = sa->sadb_sa_replay;
 968         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
 969                 x->props.flags |= XFRM_STATE_NOECN;
 970         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
 971                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
 972
 973         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
 974         if (lifetime != NULL) {
 975                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 976                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 977                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 978                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 979         }
 980         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
 981         if (lifetime != NULL) {
 982                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
 983                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
 984                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
 985                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
 986         }
 987         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
 988         if (sa->sadb_sa_auth) {
 989                 int keysize = 0;
 990                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
 991                 if (!a) {
 992                         err = -ENOSYS;
 993                         goto out;
 994                 }
 995                 if (key)
 996                         keysize = (key->sadb_key_bits + 7) / 8;
 997                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
 998                 if (!x->aalg)
 999                         goto out;
1000                 strcpy(x->aalg->alg_name, a->name);
1001                 x->aalg->alg_key_len = 0;
1002                 if (key) {
1003                         x->aalg->alg_key_len = key->sadb_key_bits;
1004                         memcpy(x->aalg->alg_key, key+1, keysize);
1005                 }
1006                 x->props.aalgo = sa->sadb_sa_auth;
1007                 /* x->algo.flags = sa->sadb_sa_flags; */
1008         }
1009         if (sa->sadb_sa_encrypt) {
1010                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1011                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1012                         if (!a) {
1013                                 err = -ENOSYS;
1014                                 goto out;
1015                         }
1016                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1017                         if (!x->calg)
1018                                 goto out;
1019                         strcpy(x->calg->alg_name, a->name);
1020                         x->props.calgo = sa->sadb_sa_encrypt;
1021                 } else {
1022                         int keysize = 0;
1023                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1024                         if (!a) {
1025                                 err = -ENOSYS;
1026                                 goto out;
1027                         }
1028                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1029                         if (key)
1030                                 keysize = (key->sadb_key_bits + 7) / 8;
1031                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1032                         if (!x->ealg)
1033                                 goto out;
1034                         strcpy(x->ealg->alg_name, a->name);
1035                         x->ealg->alg_key_len = 0;
1036                         if (key) {
1037                                 x->ealg->alg_key_len = key->sadb_key_bits;
1038                                 memcpy(x->ealg->alg_key, key+1, keysize);
1039                         }
1040                         x->props.ealgo = sa->sadb_sa_encrypt;
1041                 }
1042         }
1043         /* x->algo.flags = sa->sadb_sa_flags; */
1044
1045         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1046                                                     &x->props.saddr);
1047         if (!x->props.family) {
1048                 err = -EAFNOSUPPORT;
1049                 goto out;
1050         }
1051         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1052                                   &x->id.daddr);
1053
1054         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1055                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1056                 x->props.mode = sa2->sadb_x_sa2_mode;
1057                 if (x->props.mode)
1058                         x->props.mode--;
1059                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1060         }
1061
1062         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1063                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1064
1065                 /* Nobody uses this, but we try. */
1066                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1067                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1068         }
1069
1070         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1071                 struct sadb_x_nat_t_type* n_type;
1072                 struct xfrm_encap_tmpl *natt;
1073
1074                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1075                 if (!x->encap)
1076                         goto out;
1077
1078                 natt = x->encap;
1079                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1080                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1081
1082                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1083                         struct sadb_x_nat_t_port* n_port =
1084                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1085                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1086                 }
1087                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1088                         struct sadb_x_nat_t_port* n_port =
1089                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1090                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1091                 }
1092         }
1093
1094         x->type = xfrm_get_type(proto, x->props.family);
1095         if (x->type == NULL) {
1096                 err = -ENOPROTOOPT;
1097                 goto out;
1098         }
1099         if (x->type->init_state(x, NULL)) {
1100                 err = -EINVAL;
1101                 goto out;
1102         }
1103         x->km.seq = hdr->sadb_msg_seq;
1104         x->km.state = XFRM_STATE_VALID;
1105         return x;
1106
1107 out:
1108         x->km.state = XFRM_STATE_DEAD;
1109         xfrm_state_put(x);
1110         return ERR_PTR(err);
1111 }
1112
1113 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1114 {
1115         return -EOPNOTSUPP;
1116 }
1117
1118 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1119 {
1120         struct sk_buff *resp_skb;
1121         struct sadb_x_sa2 *sa2;
1122         struct sadb_address *saddr, *daddr;
1123         struct sadb_msg *out_hdr;
1124         struct xfrm_state *x = NULL;
1125         u8 mode;
1126         u32 reqid;
1127         u8 proto;
1128         unsigned short family;
1129         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1130
1131         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1132                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1133                 return -EINVAL;
1134
1135         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1136         if (proto == 0)
1137                 return -EINVAL;
1138
1139         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1140                 mode = sa2->sadb_x_sa2_mode - 1;
1141                 reqid = sa2->sadb_x_sa2_reqid;
1142         } else {
1143                 mode = 0;
1144                 reqid = 0;
1145         }
1146
1147         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1148         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1149
1150         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1151         switch (family) {
1152         case AF_INET:
1153                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1154                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1155                 break;
1156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1157         case AF_INET6:
1158                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1159                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1160                 break;
1161 #endif
1162         }
1163
1164         if (hdr->sadb_msg_seq) {
1165                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1166                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1167                         xfrm_state_put(x);
1168                         x = NULL;
1169                 }
1170         }
1171
1172         if (!x)
1173                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1174
1175         if (x == NULL)
1176                 return -ENOENT;
1177
1178         resp_skb = ERR_PTR(-ENOENT);
1179
1180         spin_lock_bh(&x->lock);
1181         if (x->km.state != XFRM_STATE_DEAD) {
1182                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1183                 u32 min_spi, max_spi;
1184
1185                 if (range != NULL) {
1186                         min_spi = range->sadb_spirange_min;
1187                         max_spi = range->sadb_spirange_max;
1188                 } else {
1189                         min_spi = 0x100;
1190                         max_spi = 0x0fffffff;
1191                 }
1192                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1193                 if (x->id.spi)
1194                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1195         }
1196         spin_unlock_bh(&x->lock);
1197
1198         if (IS_ERR(resp_skb)) {
1199                 xfrm_state_put(x);
1200                 return  PTR_ERR(resp_skb);
1201         }
1202
1203         out_hdr = (struct sadb_msg *) resp_skb->data;
1204         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1205         out_hdr->sadb_msg_type = SADB_GETSPI;
1206         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1207         out_hdr->sadb_msg_errno = 0;
1208         out_hdr->sadb_msg_reserved = 0;
1209         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1210         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1211
1212         xfrm_state_put(x);
1213
1214         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1215
1216         return 0;
1217 }
1218
1219 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1220 {
1221         struct xfrm_state *x;
1222
1223         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1224                 return -EOPNOTSUPP;
1225
1226         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1227                 return 0;
1228
1229         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1230         if (x == NULL)
1231                 return 0;
1232
1233         spin_lock_bh(&x->lock);
1234         if (x->km.state == XFRM_STATE_ACQ) {
1235                 x->km.state = XFRM_STATE_ERROR;
1236                 wake_up(&km_waitq);
1237         }
1238         spin_unlock_bh(&x->lock);
1239         xfrm_state_put(x);
1240         return 0;
1241 }
1242
1243 static inline int event2poltype(int event)
1244 {
1245         switch (event) {
1246         case XFRM_SAP_DELETED:
1247                 return SADB_X_SPDDELETE;
1248         case XFRM_SAP_ADDED:
1249                 return SADB_X_SPDADD;
1250         case XFRM_SAP_UPDATED:
1251                 return SADB_X_SPDUPDATE;
1252         case XFRM_SAP_EXPIRED:
1253         //      return SADB_X_SPDEXPIRE;
1254         default:
1255                 printk("pfkey: Unknown policy event %d\n", event);
1256                 break;
1257         }
1258
1259         return 0;
1260 }
1261
1262 static inline int event2keytype(int event)
1263 {
1264         switch (event) {
1265         case XFRM_SAP_DELETED:
1266                 return SADB_DELETE;
1267         case XFRM_SAP_ADDED:
1268                 return SADB_ADD;
1269         case XFRM_SAP_UPDATED:
1270                 return SADB_UPDATE;
1271         case XFRM_SAP_EXPIRED:
1272                 return SADB_EXPIRE;
1273         default:
1274                 printk("pfkey: Unknown SA event %d\n", event);
1275                 break;
1276         }
1277
1278         return 0;
1279 }
1280
1281 /* ADD/UPD/DEL */
1282 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1283 {
1284         struct sk_buff *skb;
1285         struct sadb_msg *hdr;
1286         int hsc = 3;
1287
1288         if (c->event == XFRM_SAP_DELETED)
1289                 hsc = 0;
1290
1291         if (c->event == XFRM_SAP_EXPIRED) {
1292                 if (c->data)
1293                         hsc = 2;
1294                 else
1295                         hsc = 1;
1296         }
1297
1298         skb = pfkey_xfrm_state2msg(x, 0, hsc);
1299
1300         if (IS_ERR(skb))
1301                 return PTR_ERR(skb);
1302
1303         hdr = (struct sadb_msg *) skb->data;
1304         hdr->sadb_msg_version = PF_KEY_V2;
1305         hdr->sadb_msg_type = event2keytype(c->event);
1306         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1307         hdr->sadb_msg_errno = 0;
1308         hdr->sadb_msg_reserved = 0;
1309         hdr->sadb_msg_seq = c->seq;
1310         hdr->sadb_msg_pid = c->pid;
1311
1312         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1313
1314         return 0;
1315 }
1316
1317 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1318 {
1319         struct xfrm_state *x;
1320         int err;
1321         struct km_event c;
1322
1323         xfrm_probe_algs();
1324
1325         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1326         if (IS_ERR(x))
1327                 return PTR_ERR(x);
1328
1329         xfrm_state_hold(x);
1330         if (hdr->sadb_msg_type == SADB_ADD)
1331                 err = xfrm_state_add(x);
1332         else
1333                 err = xfrm_state_update(x);
1334
1335         if (err < 0) {
1336                 x->km.state = XFRM_STATE_DEAD;
1337                 xfrm_state_put(x);
1338                 return err;
1339         }
1340
1341         if (hdr->sadb_msg_type == SADB_ADD)
1342                 c.event = XFRM_SAP_ADDED;
1343         else
1344                 c.event = XFRM_SAP_UPDATED;
1345         c.seq = hdr->sadb_msg_seq;
1346         c.pid = hdr->sadb_msg_pid;
1347         km_state_notify(x, &c);
1348         xfrm_state_put(x);
1349
1350         return err;
1351 }
1352
1353 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1354 {
1355         struct xfrm_state *x;
1356         struct km_event c;
1357         int err;
1358
1359         if (!ext_hdrs[SADB_EXT_SA-1] ||
1360             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1361                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1362                 return -EINVAL;
1363
1364         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1365         if (x == NULL)
1366                 return -ESRCH;
1367
1368         if (xfrm_state_kern(x)) {
1369                 xfrm_state_put(x);
1370                 return -EPERM;
1371         }
1372
1373         err = xfrm_state_delete(x);
1374         if (err < 0) {
1375                 xfrm_state_put(x);
1376                 return err;
1377         }
1378
1379         c.seq = hdr->sadb_msg_seq;
1380         c.pid = hdr->sadb_msg_pid;
1381         c.event = XFRM_SAP_DELETED;
1382         km_state_notify(x, &c);
1383         xfrm_state_put(x);
1384
1385         return err;
1386 }
1387
1388 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1389 {
1390         __u8 proto;
1391         struct sk_buff *out_skb;
1392         struct sadb_msg *out_hdr;
1393         struct xfrm_state *x;
1394
1395         if (!ext_hdrs[SADB_EXT_SA-1] ||
1396             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1397                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1398                 return -EINVAL;
1399
1400         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1401         if (x == NULL)
1402                 return -ESRCH;
1403
1404         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1405         proto = x->id.proto;
1406         xfrm_state_put(x);
1407         if (IS_ERR(out_skb))
1408                 return  PTR_ERR(out_skb);
1409
1410         out_hdr = (struct sadb_msg *) out_skb->data;
1411         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1412         out_hdr->sadb_msg_type = SADB_DUMP;
1413         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1414         out_hdr->sadb_msg_errno = 0;
1415         out_hdr->sadb_msg_reserved = 0;
1416         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1417         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1418         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1419
1420         return 0;
1421 }
1422
1423 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation)
1424 {
1425         struct sk_buff *skb;
1426         struct sadb_msg *hdr;
1427         int len, auth_len, enc_len, i;
1428
1429         auth_len = xfrm_count_auth_supported();
1430         if (auth_len) {
1431                 auth_len *= sizeof(struct sadb_alg);
1432                 auth_len += sizeof(struct sadb_supported);
1433         }
1434
1435         enc_len = xfrm_count_enc_supported();
1436         if (enc_len) {
1437                 enc_len *= sizeof(struct sadb_alg);
1438                 enc_len += sizeof(struct sadb_supported);
1439         }
1440
1441         len = enc_len + auth_len + sizeof(struct sadb_msg);
1442
1443         skb = alloc_skb(len + 16, allocation);
1444         if (!skb)
1445                 goto out_put_algs;
1446
1447         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1448         pfkey_hdr_dup(hdr, orig);
1449         hdr->sadb_msg_errno = 0;
1450         hdr->sadb_msg_len = len / sizeof(uint64_t);
1451
1452         if (auth_len) {
1453                 struct sadb_supported *sp;
1454                 struct sadb_alg *ap;
1455
1456                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1457                 ap = (struct sadb_alg *) (sp + 1);
1458
1459                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1460                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1461
1462                 for (i = 0; ; i++) {
1463                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1464                         if (!aalg)
1465                                 break;
1466                         if (aalg->available)
1467                                 *ap++ = aalg->desc;
1468                 }
1469         }
1470
1471         if (enc_len) {
1472                 struct sadb_supported *sp;
1473                 struct sadb_alg *ap;
1474
1475                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1476                 ap = (struct sadb_alg *) (sp + 1);
1477
1478                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1479                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1480
1481                 for (i = 0; ; i++) {
1482                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1483                         if (!ealg)
1484                                 break;
1485                         if (ealg->available)
1486                                 *ap++ = ealg->desc;
1487                 }
1488         }
1489
1490 out_put_algs:
1491         return skb;
1492 }
1493
1494 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1495 {
1496         struct pfkey_sock *pfk = pfkey_sk(sk);
1497         struct sk_buff *supp_skb;
1498
1499         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1500                 return -EINVAL;
1501
1502         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1503                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1504                         return -EEXIST;
1505                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1506         }
1507
1508         xfrm_probe_algs();
1509
1510         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1511         if (!supp_skb) {
1512                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1513                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1514
1515                 return -ENOBUFS;
1516         }
1517
1518         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1519
1520         return 0;
1521 }
1522
1523 static int key_notify_sa_flush(struct km_event *c)
1524 {
1525         struct sk_buff *skb;
1526         struct sadb_msg *hdr;
1527
1528         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1529         if (!skb)
1530                 return -ENOBUFS;
1531         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1532         hdr->sadb_msg_satype = pfkey_proto2satype(c->data);
1533         hdr->sadb_msg_seq = c->seq;
1534         hdr->sadb_msg_pid = c->pid;
1535         hdr->sadb_msg_version = PF_KEY_V2;
1536         hdr->sadb_msg_errno = (uint8_t) 0;
1537         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1538
1539         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1540
1541         return 0;
1542 }
1543
1544 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1545 {
1546         unsigned proto;
1547         struct km_event c;
1548
1549         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1550         if (proto == 0)
1551                 return -EINVAL;
1552
1553         xfrm_state_flush(proto);
1554         c.data = proto;
1555         c.seq = hdr->sadb_msg_seq;
1556         c.pid = hdr->sadb_msg_pid;
1557         c.event = XFRM_SAP_FLUSHED;
1558         km_state_notify(NULL, &c);
1559
1560         return 0;
1561 }
1562
1563 struct pfkey_dump_data
1564 {
1565         struct sk_buff *skb;
1566         struct sadb_msg *hdr;
1567         struct sock *sk;
1568 };
1569
1570 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1571 {
1572         struct pfkey_dump_data *data = ptr;
1573         struct sk_buff *out_skb;
1574         struct sadb_msg *out_hdr;
1575
1576         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1577         if (IS_ERR(out_skb))
1578                 return PTR_ERR(out_skb);
1579
1580         out_hdr = (struct sadb_msg *) out_skb->data;
1581         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1582         out_hdr->sadb_msg_type = SADB_DUMP;
1583         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1584         out_hdr->sadb_msg_errno = 0;
1585         out_hdr->sadb_msg_reserved = 0;
1586         out_hdr->sadb_msg_seq = count;
1587         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1588         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1589         return 0;
1590 }
1591
1592 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1593 {
1594         u8 proto;
1595         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1596
1597         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1598         if (proto == 0)
1599                 return -EINVAL;
1600
1601         return xfrm_state_walk(proto, dump_sa, &data);
1602 }
1603
1604 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1605 {
1606         struct pfkey_sock *pfk = pfkey_sk(sk);
1607         int satype = hdr->sadb_msg_satype;
1608
1609         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1610                 /* XXX we mangle packet... */
1611                 hdr->sadb_msg_errno = 0;
1612                 if (satype != 0 && satype != 1)
1613                         return -EINVAL;
1614                 pfk->promisc = satype;
1615         }
1616         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1617         return 0;
1618 }
1619
1620 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1621 {
1622         int i;
1623         u32 reqid = *(u32*)ptr;
1624
1625         for (i=0; i<xp->xfrm_nr; i++) {
1626                 if (xp->xfrm_vec[i].reqid == reqid)
1627                         return -EEXIST;
1628         }
1629         return 0;
1630 }
1631
1632 static u32 gen_reqid(void)
1633 {
1634         u32 start;
1635         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1636
1637         start = reqid;
1638         do {
1639                 ++reqid;
1640                 if (reqid == 0)
1641                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1642                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1643                         return reqid;
1644         } while (reqid != start);
1645         return 0;
1646 }
1647
1648 static int
1649 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1650 {
1651         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1652         struct sockaddr_in *sin;
1653 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1654         struct sockaddr_in6 *sin6;
1655 #endif
1656
1657         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1658                 return -ELOOP;
1659
1660         if (rq->sadb_x_ipsecrequest_mode == 0)
1661                 return -EINVAL;
1662
1663         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1664         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1665         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1666                 t->optional = 1;
1667         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1668                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1669                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1670                         t->reqid = 0;
1671                 if (!t->reqid && !(t->reqid = gen_reqid()))
1672                         return -ENOBUFS;
1673         }
1674
1675         /* addresses present only in tunnel mode */
1676         if (t->mode) {
1677                 switch (xp->family) {
1678                 case AF_INET:
1679                         sin = (void*)(rq+1);
1680                         if (sin->sin_family != AF_INET)
1681                                 return -EINVAL;
1682                         t->saddr.a4 = sin->sin_addr.s_addr;
1683                         sin++;
1684                         if (sin->sin_family != AF_INET)
1685                                 return -EINVAL;
1686                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1687                         break;
1688 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1689                 case AF_INET6:
1690                         sin6 = (void *)(rq+1);
1691                         if (sin6->sin6_family != AF_INET6)
1692                                 return -EINVAL;
1693                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1694                         sin6++;
1695                         if (sin6->sin6_family != AF_INET6)
1696                                 return -EINVAL;
1697                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1698                         break;
1699 #endif
1700                 default:
1701                         return -EINVAL;
1702                 }
1703         }
1704         /* No way to set this via kame pfkey */
1705         t->aalgos = t->ealgos = t->calgos = ~0;
1706         xp->xfrm_nr++;
1707         return 0;
1708 }
1709
1710 static int
1711 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1712 {
1713         int err;
1714         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1715         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1716
1717         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1718                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1719                         return err;
1720                 len -= rq->sadb_x_ipsecrequest_len;
1721                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1722         }
1723         return 0;
1724 }
1725
1726 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1727 {
1728         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1729         int socklen = (xp->family == AF_INET ?
1730                        sizeof(struct sockaddr_in) :
1731                        sizeof(struct sockaddr_in6));
1732
1733         return sizeof(struct sadb_msg) +
1734                 (sizeof(struct sadb_lifetime) * 3) +
1735                 (sizeof(struct sadb_address) * 2) +
1736                 (sockaddr_size * 2) +
1737                 sizeof(struct sadb_x_policy) +
1738                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1739                                 (socklen * 2)));
1740 }
1741
1742 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1743 {
1744         struct sk_buff *skb;
1745         int size;
1746
1747         size = pfkey_xfrm_policy2msg_size(xp);
1748
1749         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1750         if (skb == NULL)
1751                 return ERR_PTR(-ENOBUFS);
1752
1753         return skb;
1754 }
1755
1756 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1757 {
1758         struct sadb_msg *hdr;
1759         struct sadb_address *addr;
1760         struct sadb_lifetime *lifetime;
1761         struct sadb_x_policy *pol;
1762         struct sockaddr_in   *sin;
1763 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1764         struct sockaddr_in6  *sin6;
1765 #endif
1766         int i;
1767         int size;
1768         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1769         int socklen = (xp->family == AF_INET ?
1770                        sizeof(struct sockaddr_in) :
1771                        sizeof(struct sockaddr_in6));
1772
1773         size = pfkey_xfrm_policy2msg_size(xp);
1774
1775         /* call should fill header later */
1776         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1777         memset(hdr, 0, size);   /* XXX do we need this ? */
1778
1779         /* src address */
1780         addr = (struct sadb_address*) skb_put(skb,
1781                                               sizeof(struct sadb_address)+sockaddr_size);
1782         addr->sadb_address_len =
1783                 (sizeof(struct sadb_address)+sockaddr_size)/
1784                         sizeof(uint64_t);
1785         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1786         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1787         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1788         addr->sadb_address_reserved = 0;
1789         /* src address */
1790         if (xp->family == AF_INET) {
1791                 sin = (struct sockaddr_in *) (addr + 1);
1792                 sin->sin_family = AF_INET;
1793                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1794                 sin->sin_port = xp->selector.sport;
1795                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1796         }
1797 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1798         else if (xp->family == AF_INET6) {
1799                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1800                 sin6->sin6_family = AF_INET6;
1801                 sin6->sin6_port = xp->selector.sport;
1802                 sin6->sin6_flowinfo = 0;
1803                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1804                        sizeof(struct in6_addr));
1805                 sin6->sin6_scope_id = 0;
1806         }
1807 #endif
1808         else
1809                 BUG();
1810
1811         /* dst address */
1812         addr = (struct sadb_address*) skb_put(skb,
1813                                               sizeof(struct sadb_address)+sockaddr_size);
1814         addr->sadb_address_len =
1815                 (sizeof(struct sadb_address)+sockaddr_size)/
1816                         sizeof(uint64_t);
1817         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1818         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1819         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1820         addr->sadb_address_reserved = 0;
1821         if (xp->family == AF_INET) {
1822                 sin = (struct sockaddr_in *) (addr + 1);
1823                 sin->sin_family = AF_INET;
1824                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1825                 sin->sin_port = xp->selector.dport;
1826                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1827         }
1828 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1829         else if (xp->family == AF_INET6) {
1830                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1831                 sin6->sin6_family = AF_INET6;
1832                 sin6->sin6_port = xp->selector.dport;
1833                 sin6->sin6_flowinfo = 0;
1834                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1835                        sizeof(struct in6_addr));
1836                 sin6->sin6_scope_id = 0;
1837         }
1838 #endif
1839         else
1840                 BUG();
1841
1842         /* hard time */
1843         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1844                                                      sizeof(struct sadb_lifetime));
1845         lifetime->sadb_lifetime_len =
1846                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1847         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1848         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1849         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1850         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1851         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1852         /* soft time */
1853         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1854                                                      sizeof(struct sadb_lifetime));
1855         lifetime->sadb_lifetime_len =
1856                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1857         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1858         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1859         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1860         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1861         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1862         /* current time */
1863         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1864                                                      sizeof(struct sadb_lifetime));
1865         lifetime->sadb_lifetime_len =
1866                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1867         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1868         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1869         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1870         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1871         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1872
1873         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1874         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1875         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1876         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1877         if (xp->action == XFRM_POLICY_ALLOW) {
1878                 if (xp->xfrm_nr)
1879                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1880                 else
1881                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1882         }
1883         pol->sadb_x_policy_dir = dir+1;
1884         pol->sadb_x_policy_id = xp->index;
1885         pol->sadb_x_policy_priority = xp->priority;
1886
1887         for (i=0; i<xp->xfrm_nr; i++) {
1888                 struct sadb_x_ipsecrequest *rq;
1889                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1890                 int req_size;
1891
1892                 req_size = sizeof(struct sadb_x_ipsecrequest);
1893                 if (t->mode)
1894                         req_size += 2*socklen;
1895                 else
1896                         size -= 2*socklen;
1897                 rq = (void*)skb_put(skb, req_size);
1898                 pol->sadb_x_policy_len += req_size/8;
1899                 memset(rq, 0, sizeof(*rq));
1900                 rq->sadb_x_ipsecrequest_len = req_size;
1901                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
1902                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
1903                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
1904                 if (t->reqid)
1905                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
1906                 if (t->optional)
1907                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
1908                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
1909                 if (t->mode) {
1910                         switch (xp->family) {
1911                         case AF_INET:
1912                                 sin = (void*)(rq+1);
1913                                 sin->sin_family = AF_INET;
1914                                 sin->sin_addr.s_addr = t->saddr.a4;
1915                                 sin->sin_port = 0;
1916                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1917                                 sin++;
1918                                 sin->sin_family = AF_INET;
1919                                 sin->sin_addr.s_addr = t->id.daddr.a4;
1920                                 sin->sin_port = 0;
1921                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1922                                 break;
1923 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1924                         case AF_INET6:
1925                                 sin6 = (void*)(rq+1);
1926                                 sin6->sin6_family = AF_INET6;
1927                                 sin6->sin6_port = 0;
1928                                 sin6->sin6_flowinfo = 0;
1929                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
1930                                        sizeof(struct in6_addr));
1931                                 sin6->sin6_scope_id = 0;
1932
1933                                 sin6++;
1934                                 sin6->sin6_family = AF_INET6;
1935                                 sin6->sin6_port = 0;
1936                                 sin6->sin6_flowinfo = 0;
1937                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
1938                                        sizeof(struct in6_addr));
1939                                 sin6->sin6_scope_id = 0;
1940                                 break;
1941 #endif
1942                         default:
1943                                 break;
1944                         }
1945                 }
1946         }
1947         hdr->sadb_msg_len = size / sizeof(uint64_t);
1948         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
1949 }
1950
1951 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1952 {
1953         struct sk_buff *out_skb;
1954         struct sadb_msg *out_hdr;
1955         int err;
1956
1957         out_skb = pfkey_xfrm_policy2msg_prep(xp);
1958         if (IS_ERR(out_skb)) {
1959                 err = PTR_ERR(out_skb);
1960                 goto out;
1961         }
1962         pfkey_xfrm_policy2msg(out_skb, xp, dir);
1963
1964         out_hdr = (struct sadb_msg *) out_skb->data;
1965         out_hdr->sadb_msg_version = PF_KEY_V2;
1966
1967         if (c->data && c->event == XFRM_SAP_DELETED)
1968                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
1969         else
1970                 out_hdr->sadb_msg_type = event2poltype(c->event);
1971         out_hdr->sadb_msg_errno = 0;
1972         out_hdr->sadb_msg_seq = c->seq;
1973         out_hdr->sadb_msg_pid = c->pid;
1974         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1975 out:
1976         return 0;
1977
1978 }
1979
1980 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1981 {
1982         int err;
1983         struct sadb_lifetime *lifetime;
1984         struct sadb_address *sa;
1985         struct sadb_x_policy *pol;
1986         struct xfrm_policy *xp;
1987         struct km_event c;
1988
1989         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1990                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
1991             !ext_hdrs[SADB_X_EXT_POLICY-1])
1992                 return -EINVAL;
1993
1994         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
1995         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
1996                 return -EINVAL;
1997         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
1998                 return -EINVAL;
1999
2000         xp = xfrm_policy_alloc(GFP_KERNEL);
2001         if (xp == NULL)
2002                 return -ENOBUFS;
2003
2004         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2005                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2006         xp->priority = pol->sadb_x_policy_priority;
2007
2008         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2009         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2010         if (!xp->family) {
2011                 err = -EINVAL;
2012                 goto out;
2013         }
2014         xp->selector.family = xp->family;
2015         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2016         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2017         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2018         if (xp->selector.sport)
2019                 xp->selector.sport_mask = ~0;
2020
2021         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2022         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2023         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2024
2025         /* Amusing, we set this twice.  KAME apps appear to set same value
2026          * in both addresses.
2027          */
2028         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2029
2030         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2031         if (xp->selector.dport)
2032                 xp->selector.dport_mask = ~0;
2033
2034         xp->lft.soft_byte_limit = XFRM_INF;
2035         xp->lft.hard_byte_limit = XFRM_INF;
2036         xp->lft.soft_packet_limit = XFRM_INF;
2037         xp->lft.hard_packet_limit = XFRM_INF;
2038         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2039                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2040                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2041                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2042                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2043         }
2044         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2045                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2046                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2047                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2048                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2049         }
2050         xp->xfrm_nr = 0;
2051         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2052             (err = parse_ipsecrequests(xp, pol)) < 0)
2053                 goto out;
2054
2055         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2056                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2057         if (err) {
2058                 kfree(xp);
2059                 return err;
2060         }
2061
2062         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2063                 c.event = XFRM_SAP_UPDATED;
2064         else
2065                 c.event = XFRM_SAP_ADDED;
2066
2067         c.seq = hdr->sadb_msg_seq;
2068         c.pid = hdr->sadb_msg_pid;
2069
2070         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2071         xfrm_pol_put(xp);
2072         return 0;
2073
2074 out:
2075         kfree(xp);
2076         return err;
2077 }
2078
2079 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2080 {
2081         int err;
2082         struct sadb_address *sa;
2083         struct sadb_x_policy *pol;
2084         struct xfrm_policy *xp;
2085         struct xfrm_selector sel;
2086         struct km_event c;
2087
2088         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2089                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2090             !ext_hdrs[SADB_X_EXT_POLICY-1])
2091                 return -EINVAL;
2092
2093         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2094         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2095                 return -EINVAL;
2096
2097         memset(&sel, 0, sizeof(sel));
2098
2099         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2100         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2101         sel.prefixlen_s = sa->sadb_address_prefixlen;
2102         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2103         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2104         if (sel.sport)
2105                 sel.sport_mask = ~0;
2106
2107         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2108         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2109         sel.prefixlen_d = sa->sadb_address_prefixlen;
2110         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2111         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2112         if (sel.dport)
2113                 sel.dport_mask = ~0;
2114
2115         xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
2116         if (xp == NULL)
2117                 return -ENOENT;
2118
2119         err = 0;
2120
2121         c.seq = hdr->sadb_msg_seq;
2122         c.pid = hdr->sadb_msg_pid;
2123         c.event = XFRM_SAP_DELETED;
2124         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2125
2126         xfrm_pol_put(xp);
2127         return err;
2128 }
2129
2130 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2131 {
2132         int err;
2133         struct sk_buff *out_skb;
2134         struct sadb_msg *out_hdr;
2135         err = 0;
2136
2137         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2138         if (IS_ERR(out_skb)) {
2139                 err =  PTR_ERR(out_skb);
2140                 goto out;
2141         }
2142         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2143
2144         out_hdr = (struct sadb_msg *) out_skb->data;
2145         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2146         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2147         out_hdr->sadb_msg_satype = 0;
2148         out_hdr->sadb_msg_errno = 0;
2149         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2150         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2151         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2152         err = 0;
2153
2154 out:
2155         return err;
2156 }
2157
2158 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2159 {
2160         int err;
2161         struct sadb_x_policy *pol;
2162         struct xfrm_policy *xp;
2163         struct km_event c;
2164
2165         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2166                 return -EINVAL;
2167
2168         xp = xfrm_policy_byid(0, pol->sadb_x_policy_id,
2169                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2170         if (xp == NULL)
2171                 return -ENOENT;
2172
2173         err = 0;
2174
2175         c.seq = hdr->sadb_msg_seq;
2176         c.pid = hdr->sadb_msg_pid;
2177         if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
2178                 c.data = 1; // to signal pfkey of SADB_X_SPDDELETE2
2179                 c.event = XFRM_SAP_DELETED;
2180                 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2181         } else {
2182                 err = key_pol_get_resp(sk, xp, hdr, pol->sadb_x_policy_dir-1);
2183         }
2184
2185         xfrm_pol_put(xp);
2186         return err;
2187 }
2188
2189 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2190 {
2191         struct pfkey_dump_data *data = ptr;
2192         struct sk_buff *out_skb;
2193         struct sadb_msg *out_hdr;
2194
2195         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2196         if (IS_ERR(out_skb))
2197                 return PTR_ERR(out_skb);
2198
2199         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2200
2201         out_hdr = (struct sadb_msg *) out_skb->data;
2202         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2203         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2204         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2205         out_hdr->sadb_msg_errno = 0;
2206         out_hdr->sadb_msg_seq = count;
2207         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2208         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2209         return 0;
2210 }
2211
2212 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2213 {
2214         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2215
2216         return xfrm_policy_walk(dump_sp, &data);
2217 }
2218
2219 static int key_notify_policy_flush(struct km_event *c)
2220 {
2221         struct sk_buff *skb_out;
2222         struct sadb_msg *hdr;
2223
2224         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2225         if (!skb_out)
2226                 return -ENOBUFS;
2227         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2228         hdr->sadb_msg_seq = c->seq;
2229         hdr->sadb_msg_pid = c->pid;
2230         hdr->sadb_msg_version = PF_KEY_V2;
2231         hdr->sadb_msg_errno = (uint8_t) 0;
2232         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2233         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2234         return 0;
2235
2236 }
2237
2238 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2239 {
2240         struct km_event c;
2241
2242         xfrm_policy_flush();
2243         c.event = XFRM_SAP_FLUSHED;
2244         c.pid = hdr->sadb_msg_pid;
2245         c.seq = hdr->sadb_msg_seq;
2246         km_policy_notify(NULL, 0, &c);
2247
2248         return 0;
2249 }
2250
2251 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2252                              struct sadb_msg *hdr, void **ext_hdrs);
2253 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2254         [SADB_RESERVED]         = pfkey_reserved,
2255         [SADB_GETSPI]           = pfkey_getspi,
2256         [SADB_UPDATE]           = pfkey_add,
2257         [SADB_ADD]              = pfkey_add,
2258         [SADB_DELETE]           = pfkey_delete,
2259         [SADB_GET]              = pfkey_get,
2260         [SADB_ACQUIRE]          = pfkey_acquire,
2261         [SADB_REGISTER]         = pfkey_register,
2262         [SADB_EXPIRE]           = NULL,
2263         [SADB_FLUSH]            = pfkey_flush,
2264         [SADB_DUMP]             = pfkey_dump,
2265         [SADB_X_PROMISC]        = pfkey_promisc,
2266         [SADB_X_PCHANGE]        = NULL,
2267         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2268         [SADB_X_SPDADD]         = pfkey_spdadd,
2269         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2270         [SADB_X_SPDGET]         = pfkey_spdget,
2271         [SADB_X_SPDACQUIRE]     = NULL,
2272         [SADB_X_SPDDUMP]        = pfkey_spddump,
2273         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2274         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2275         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2276 };
2277
2278 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2279 {
2280         void *ext_hdrs[SADB_EXT_MAX];
2281         int err;
2282
2283         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2284                         BROADCAST_PROMISC_ONLY, NULL);
2285
2286         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2287         err = parse_exthdrs(skb, hdr, ext_hdrs);
2288         if (!err) {
2289                 err = -EOPNOTSUPP;
2290                 if (pfkey_funcs[hdr->sadb_msg_type])
2291                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2292         }
2293         return err;
2294 }
2295
2296 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2297 {
2298         struct sadb_msg *hdr = NULL;
2299
2300         if (skb->len < sizeof(*hdr)) {
2301                 *errp = -EMSGSIZE;
2302         } else {
2303                 hdr = (struct sadb_msg *) skb->data;
2304                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2305                     hdr->sadb_msg_reserved != 0 ||
2306                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2307                      hdr->sadb_msg_type > SADB_MAX)) {
2308                         hdr = NULL;
2309                         *errp = -EINVAL;
2310                 } else if (hdr->sadb_msg_len != (skb->len /
2311                                                  sizeof(uint64_t)) ||
2312                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2313                                                 sizeof(uint64_t))) {
2314                         hdr = NULL;
2315                         *errp = -EMSGSIZE;
2316                 } else {
2317                         *errp = 0;
2318                 }
2319         }
2320         return hdr;
2321 }
2322
2323 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2324 {
2325         return t->aalgos & (1 << d->desc.sadb_alg_id);
2326 }
2327
2328 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2329 {
2330         return t->ealgos & (1 << d->desc.sadb_alg_id);
2331 }
2332
2333 static int count_ah_combs(struct xfrm_tmpl *t)
2334 {
2335         int i, sz = 0;
2336
2337         for (i = 0; ; i++) {
2338                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2339                 if (!aalg)
2340                         break;
2341                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2342                         sz += sizeof(struct sadb_comb);
2343         }
2344         return sz + sizeof(struct sadb_prop);
2345 }
2346
2347 static int count_esp_combs(struct xfrm_tmpl *t)
2348 {
2349         int i, k, sz = 0;
2350
2351         for (i = 0; ; i++) {
2352                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2353                 if (!ealg)
2354                         break;
2355
2356                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2357                         continue;
2358
2359                 for (k = 1; ; k++) {
2360                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2361                         if (!aalg)
2362                                 break;
2363
2364                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2365                                 sz += sizeof(struct sadb_comb);
2366                 }
2367         }
2368         return sz + sizeof(struct sadb_prop);
2369 }
2370
2371 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2372 {
2373         struct sadb_prop *p;
2374         int i;
2375
2376         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2377         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2378         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2379         p->sadb_prop_replay = 32;
2380         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2381
2382         for (i = 0; ; i++) {
2383                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2384                 if (!aalg)
2385                         break;
2386
2387                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2388                         struct sadb_comb *c;
2389                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2390                         memset(c, 0, sizeof(*c));
2391                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2392                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2393                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2394                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2395                         c->sadb_comb_hard_addtime = 24*60*60;
2396                         c->sadb_comb_soft_addtime = 20*60*60;
2397                         c->sadb_comb_hard_usetime = 8*60*60;
2398                         c->sadb_comb_soft_usetime = 7*60*60;
2399                 }
2400         }
2401 }
2402
2403 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2404 {
2405         struct sadb_prop *p;
2406         int i, k;
2407
2408         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2409         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2410         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2411         p->sadb_prop_replay = 32;
2412         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2413
2414         for (i=0; ; i++) {
2415                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2416                 if (!ealg)
2417                         break;
2418
2419                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2420                         continue;
2421
2422                 for (k = 1; ; k++) {
2423                         struct sadb_comb *c;
2424                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2425                         if (!aalg)
2426                                 break;
2427                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2428                                 continue;
2429                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2430                         memset(c, 0, sizeof(*c));
2431                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2432                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2433                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2434                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2435                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2436                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2437                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2438                         c->sadb_comb_hard_addtime = 24*60*60;
2439                         c->sadb_comb_soft_addtime = 20*60*60;
2440                         c->sadb_comb_hard_usetime = 8*60*60;
2441                         c->sadb_comb_soft_usetime = 7*60*60;
2442                 }
2443         }
2444 }
2445
2446 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2447 {
2448         return 0;
2449 }
2450
2451 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2452 {
2453         struct sk_buff *out_skb;
2454         struct sadb_msg *out_hdr;
2455         int hard;
2456         int hsc;
2457
2458         hard = c->data;
2459         if (hard)
2460                 hsc = 2;
2461         else
2462                 hsc = 1;
2463
2464         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2465         if (IS_ERR(out_skb))
2466                 return PTR_ERR(out_skb);
2467
2468         out_hdr = (struct sadb_msg *) out_skb->data;
2469         out_hdr->sadb_msg_version = PF_KEY_V2;
2470         out_hdr->sadb_msg_type = SADB_EXPIRE;
2471         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2472         out_hdr->sadb_msg_errno = 0;
2473         out_hdr->sadb_msg_reserved = 0;
2474         out_hdr->sadb_msg_seq = 0;
2475         out_hdr->sadb_msg_pid = 0;
2476
2477         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2478         return 0;
2479 }
2480
2481 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2482 {
2483         switch (c->event) {
2484         case XFRM_SAP_EXPIRED:
2485                 return key_notify_sa_expire(x, c);
2486         case XFRM_SAP_DELETED:
2487         case XFRM_SAP_ADDED:
2488         case XFRM_SAP_UPDATED:
2489                 return key_notify_sa(x, c);
2490         case XFRM_SAP_FLUSHED:
2491                 return key_notify_sa_flush(c);
2492         default:
2493                 printk("pfkey: Unknown SA event %d\n", c->event);
2494                 break;
2495         }
2496
2497         return 0;
2498 }
2499
2500 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2501 {
2502         switch (c->event) {
2503         case XFRM_SAP_EXPIRED:
2504                 return key_notify_policy_expire(xp, c);
2505         case XFRM_SAP_DELETED:
2506         case XFRM_SAP_ADDED:
2507         case XFRM_SAP_UPDATED:
2508                 return key_notify_policy(xp, dir, c);
2509         case XFRM_SAP_FLUSHED:
2510                 return key_notify_policy_flush(c);
2511         default:
2512                 printk("pfkey: Unknown policy event %d\n", c->event);
2513                 break;
2514         }
2515
2516         return 0;
2517 }
2518
2519 static u32 get_acqseq(void)
2520 {
2521         u32 res;
2522         static u32 acqseq;
2523         static DEFINE_SPINLOCK(acqseq_lock);
2524
2525         spin_lock_bh(&acqseq_lock);
2526         res = (++acqseq ? : ++acqseq);
2527         spin_unlock_bh(&acqseq_lock);
2528         return res;
2529 }
2530
2531 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2532 {
2533         struct sk_buff *skb;
2534         struct sadb_msg *hdr;
2535         struct sadb_address *addr;
2536         struct sadb_x_policy *pol;
2537         struct sockaddr_in *sin;
2538 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2539         struct sockaddr_in6 *sin6;
2540 #endif
2541         int sockaddr_size;
2542         int size;
2543
2544         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2545         if (!sockaddr_size)
2546                 return -EINVAL;
2547
2548         size = sizeof(struct sadb_msg) +
2549                 (sizeof(struct sadb_address) * 2) +
2550                 (sockaddr_size * 2) +
2551                 sizeof(struct sadb_x_policy);
2552
2553         if (x->id.proto == IPPROTO_AH)
2554                 size += count_ah_combs(t);
2555         else if (x->id.proto == IPPROTO_ESP)
2556                 size += count_esp_combs(t);
2557
2558         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2559         if (skb == NULL)
2560                 return -ENOMEM;
2561
2562         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2563         hdr->sadb_msg_version = PF_KEY_V2;
2564         hdr->sadb_msg_type = SADB_ACQUIRE;
2565         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2566         hdr->sadb_msg_len = size / sizeof(uint64_t);
2567         hdr->sadb_msg_errno = 0;
2568         hdr->sadb_msg_reserved = 0;
2569         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2570         hdr->sadb_msg_pid = 0;
2571
2572         /* src address */
2573         addr = (struct sadb_address*) skb_put(skb,
2574                                               sizeof(struct sadb_address)+sockaddr_size);
2575         addr->sadb_address_len =
2576                 (sizeof(struct sadb_address)+sockaddr_size)/
2577                         sizeof(uint64_t);
2578         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2579         addr->sadb_address_proto = 0;
2580         addr->sadb_address_reserved = 0;
2581         if (x->props.family == AF_INET) {
2582                 addr->sadb_address_prefixlen = 32;
2583
2584                 sin = (struct sockaddr_in *) (addr + 1);
2585                 sin->sin_family = AF_INET;
2586                 sin->sin_addr.s_addr = x->props.saddr.a4;
2587                 sin->sin_port = 0;
2588                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2589         }
2590 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2591         else if (x->props.family == AF_INET6) {
2592                 addr->sadb_address_prefixlen = 128;
2593
2594                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2595                 sin6->sin6_family = AF_INET6;
2596                 sin6->sin6_port = 0;
2597                 sin6->sin6_flowinfo = 0;
2598                 memcpy(&sin6->sin6_addr,
2599                        x->props.saddr.a6, sizeof(struct in6_addr));
2600                 sin6->sin6_scope_id = 0;
2601         }
2602 #endif
2603         else
2604                 BUG();
2605
2606         /* dst address */
2607         addr = (struct sadb_address*) skb_put(skb,
2608                                               sizeof(struct sadb_address)+sockaddr_size);
2609         addr->sadb_address_len =
2610                 (sizeof(struct sadb_address)+sockaddr_size)/
2611                         sizeof(uint64_t);
2612         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2613         addr->sadb_address_proto = 0;
2614         addr->sadb_address_reserved = 0;
2615         if (x->props.family == AF_INET) {
2616                 addr->sadb_address_prefixlen = 32;
2617
2618                 sin = (struct sockaddr_in *) (addr + 1);
2619                 sin->sin_family = AF_INET;
2620                 sin->sin_addr.s_addr = x->id.daddr.a4;
2621                 sin->sin_port = 0;
2622                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2623         }
2624 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2625         else if (x->props.family == AF_INET6) {
2626                 addr->sadb_address_prefixlen = 128;
2627
2628                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2629                 sin6->sin6_family = AF_INET6;
2630                 sin6->sin6_port = 0;
2631                 sin6->sin6_flowinfo = 0;
2632                 memcpy(&sin6->sin6_addr,
2633                        x->id.daddr.a6, sizeof(struct in6_addr));
2634                 sin6->sin6_scope_id = 0;
2635         }
2636 #endif
2637         else
2638                 BUG();
2639
2640         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2641         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2642         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2643         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2644         pol->sadb_x_policy_dir = dir+1;
2645         pol->sadb_x_policy_id = xp->index;
2646
2647         /* Set sadb_comb's. */
2648         if (x->id.proto == IPPROTO_AH)
2649                 dump_ah_combs(skb, t);
2650         else if (x->id.proto == IPPROTO_ESP)
2651                 dump_esp_combs(skb, t);
2652
2653         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2654 }
2655
2656 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2657                                                 u8 *data, int len, int *dir)
2658 {
2659         struct xfrm_policy *xp;
2660         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2661
2662         switch (family) {
2663         case AF_INET:
2664                 if (opt != IP_IPSEC_POLICY) {
2665                         *dir = -EOPNOTSUPP;
2666                         return NULL;
2667                 }
2668                 break;
2669 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2670         case AF_INET6:
2671                 if (opt != IPV6_IPSEC_POLICY) {
2672                         *dir = -EOPNOTSUPP;
2673                         return NULL;
2674                 }
2675                 break;
2676 #endif
2677         default:
2678                 *dir = -EINVAL;
2679                 return NULL;
2680         }
2681
2682         *dir = -EINVAL;
2683
2684         if (len < sizeof(struct sadb_x_policy) ||
2685             pol->sadb_x_policy_len*8 > len ||
2686             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2687             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2688                 return NULL;
2689
2690         xp = xfrm_policy_alloc(GFP_ATOMIC);
2691         if (xp == NULL) {
2692                 *dir = -ENOBUFS;
2693                 return NULL;
2694         }
2695
2696         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2697                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2698
2699         xp->lft.soft_byte_limit = XFRM_INF;
2700         xp->lft.hard_byte_limit = XFRM_INF;
2701         xp->lft.soft_packet_limit = XFRM_INF;
2702         xp->lft.hard_packet_limit = XFRM_INF;
2703         xp->family = family;
2704
2705         xp->xfrm_nr = 0;
2706         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2707             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2708                 goto out;
2709
2710         *dir = pol->sadb_x_policy_dir-1;
2711         return xp;
2712
2713 out:
2714         kfree(xp);
2715         return NULL;
2716 }
2717
2718 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2719 {
2720         struct sk_buff *skb;
2721         struct sadb_msg *hdr;
2722         struct sadb_sa *sa;
2723         struct sadb_address *addr;
2724         struct sadb_x_nat_t_port *n_port;
2725         struct sockaddr_in *sin;
2726 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2727         struct sockaddr_in6 *sin6;
2728 #endif
2729         int sockaddr_size;
2730         int size;
2731         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2732         struct xfrm_encap_tmpl *natt = NULL;
2733
2734         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2735         if (!sockaddr_size)
2736                 return -EINVAL;
2737
2738         if (!satype)
2739                 return -EINVAL;
2740
2741         if (!x->encap)
2742                 return -EINVAL;
2743
2744         natt = x->encap;
2745
2746         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2747          *
2748          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2749          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2750          */
2751
2752         size = sizeof(struct sadb_msg) +
2753                 sizeof(struct sadb_sa) +
2754                 (sizeof(struct sadb_address) * 2) +
2755                 (sockaddr_size * 2) +
2756                 (sizeof(struct sadb_x_nat_t_port) * 2);
2757
2758         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2759         if (skb == NULL)
2760                 return -ENOMEM;
2761
2762         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2763         hdr->sadb_msg_version = PF_KEY_V2;
2764         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2765         hdr->sadb_msg_satype = satype;
2766         hdr->sadb_msg_len = size / sizeof(uint64_t);
2767         hdr->sadb_msg_errno = 0;
2768         hdr->sadb_msg_reserved = 0;
2769         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2770         hdr->sadb_msg_pid = 0;
2771
2772         /* SA */
2773         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2774         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2775         sa->sadb_sa_exttype = SADB_EXT_SA;
2776         sa->sadb_sa_spi = x->id.spi;
2777         sa->sadb_sa_replay = 0;
2778         sa->sadb_sa_state = 0;
2779         sa->sadb_sa_auth = 0;
2780         sa->sadb_sa_encrypt = 0;
2781         sa->sadb_sa_flags = 0;
2782
2783         /* ADDRESS_SRC (old addr) */
2784         addr = (struct sadb_address*)
2785                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2786         addr->sadb_address_len =
2787                 (sizeof(struct sadb_address)+sockaddr_size)/
2788                         sizeof(uint64_t);
2789         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2790         addr->sadb_address_proto = 0;
2791         addr->sadb_address_reserved = 0;
2792         if (x->props.family == AF_INET) {
2793                 addr->sadb_address_prefixlen = 32;
2794
2795                 sin = (struct sockaddr_in *) (addr + 1);
2796                 sin->sin_family = AF_INET;
2797                 sin->sin_addr.s_addr = x->props.saddr.a4;
2798                 sin->sin_port = 0;
2799                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2800         }
2801 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2802         else if (x->props.family == AF_INET6) {
2803                 addr->sadb_address_prefixlen = 128;
2804
2805                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2806                 sin6->sin6_family = AF_INET6;
2807                 sin6->sin6_port = 0;
2808                 sin6->sin6_flowinfo = 0;
2809                 memcpy(&sin6->sin6_addr,
2810                        x->props.saddr.a6, sizeof(struct in6_addr));
2811                 sin6->sin6_scope_id = 0;
2812         }
2813 #endif
2814         else
2815                 BUG();
2816
2817         /* NAT_T_SPORT (old port) */
2818         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2819         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2820         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
2821         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
2822         n_port->sadb_x_nat_t_port_reserved = 0;
2823
2824         /* ADDRESS_DST (new addr) */
2825         addr = (struct sadb_address*)
2826                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2827         addr->sadb_address_len =
2828                 (sizeof(struct sadb_address)+sockaddr_size)/
2829                         sizeof(uint64_t);
2830         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2831         addr->sadb_address_proto = 0;
2832         addr->sadb_address_reserved = 0;
2833         if (x->props.family == AF_INET) {
2834                 addr->sadb_address_prefixlen = 32;
2835
2836                 sin = (struct sockaddr_in *) (addr + 1);
2837                 sin->sin_family = AF_INET;
2838                 sin->sin_addr.s_addr = ipaddr->a4;
2839                 sin->sin_port = 0;
2840                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2841         }
2842 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2843         else if (x->props.family == AF_INET6) {
2844                 addr->sadb_address_prefixlen = 128;
2845
2846                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2847                 sin6->sin6_family = AF_INET6;
2848                 sin6->sin6_port = 0;
2849                 sin6->sin6_flowinfo = 0;
2850                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
2851                 sin6->sin6_scope_id = 0;
2852         }
2853 #endif
2854         else
2855                 BUG();
2856
2857         /* NAT_T_DPORT (new port) */
2858         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
2859         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
2860         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
2861         n_port->sadb_x_nat_t_port_port = sport;
2862         n_port->sadb_x_nat_t_port_reserved = 0;
2863
2864         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2865 }
2866
2867 static int pfkey_sendmsg(struct kiocb *kiocb,
2868                          struct socket *sock, struct msghdr *msg, size_t len)
2869 {
2870         struct sock *sk = sock->sk;
2871         struct sk_buff *skb = NULL;
2872         struct sadb_msg *hdr = NULL;
2873         int err;
2874
2875         err = -EOPNOTSUPP;
2876         if (msg->msg_flags & MSG_OOB)
2877                 goto out;
2878
2879         err = -EMSGSIZE;
2880         if ((unsigned)len > sk->sk_sndbuf - 32)
2881                 goto out;
2882
2883         err = -ENOBUFS;
2884         skb = alloc_skb(len, GFP_KERNEL);
2885         if (skb == NULL)
2886                 goto out;
2887
2888         err = -EFAULT;
2889         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
2890                 goto out;
2891
2892         hdr = pfkey_get_base_msg(skb, &err);
2893         if (!hdr)
2894                 goto out;
2895
2896         down(&xfrm_cfg_sem);
2897         err = pfkey_process(sk, skb, hdr);
2898         up(&xfrm_cfg_sem);
2899
2900 out:
2901         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
2902                 err = 0;
2903         if (skb)
2904                 kfree_skb(skb);
2905
2906         return err ? : len;
2907 }
2908
2909 static int pfkey_recvmsg(struct kiocb *kiocb,
2910                          struct socket *sock, struct msghdr *msg, size_t len,
2911                          int flags)
2912 {
2913         struct sock *sk = sock->sk;
2914         struct sk_buff *skb;
2915         int copied, err;
2916
2917         err = -EINVAL;
2918         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
2919                 goto out;
2920
2921         msg->msg_namelen = 0;
2922         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
2923         if (skb == NULL)
2924                 goto out;
2925
2926         copied = skb->len;
2927         if (copied > len) {
2928                 msg->msg_flags |= MSG_TRUNC;
2929                 copied = len;
2930         }
2931
2932         skb->h.raw = skb->data;
2933         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2934         if (err)
2935                 goto out_free;
2936
2937         sock_recv_timestamp(msg, sk, skb);
2938
2939         err = (flags & MSG_TRUNC) ? skb->len : copied;
2940
2941 out_free:
2942         skb_free_datagram(sk, skb);
2943 out:
2944         return err;
2945 }
2946
2947 static struct proto_ops pfkey_ops = {
2948         .family         =       PF_KEY,
2949         .owner          =       THIS_MODULE,
2950         /* Operations that make no sense on pfkey sockets. */
2951         .bind           =       sock_no_bind,
2952         .connect        =       sock_no_connect,
2953         .socketpair     =       sock_no_socketpair,
2954         .accept         =       sock_no_accept,
2955         .getname        =       sock_no_getname,
2956         .ioctl          =       sock_no_ioctl,
2957         .listen         =       sock_no_listen,
2958         .shutdown       =       sock_no_shutdown,
2959         .setsockopt     =       sock_no_setsockopt,
2960         .getsockopt     =       sock_no_getsockopt,
2961         .mmap           =       sock_no_mmap,
2962         .sendpage       =       sock_no_sendpage,
2963
2964         /* Now the operations that really occur. */
2965         .release        =       pfkey_release,
2966         .poll           =       datagram_poll,
2967         .sendmsg        =       pfkey_sendmsg,
2968         .recvmsg        =       pfkey_recvmsg,
2969 };
2970
2971 static struct net_proto_family pfkey_family_ops = {
2972         .family =       PF_KEY,
2973         .create =       pfkey_create,
2974         .owner  =       THIS_MODULE,
2975 };
2976
2977 #ifdef CONFIG_PROC_FS
2978 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
2979                            int length, int *eof, void *data)
2980 {
2981         off_t pos = 0;
2982         off_t begin = 0;
2983         int len = 0;
2984         struct sock *s;
2985         struct hlist_node *node;
2986
2987         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
2988
2989         read_lock(&pfkey_table_lock);
2990
2991         sk_for_each(s, node, &pfkey_table) {
2992                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
2993                                s,
2994                                atomic_read(&s->sk_refcnt),
2995                                atomic_read(&s->sk_rmem_alloc),
2996                                atomic_read(&s->sk_wmem_alloc),
2997                                sock_i_uid(s),
2998                                sock_i_ino(s)
2999                                );
3000
3001                 buffer[len++] = '\n';
3002
3003                 pos = begin + len;
3004                 if (pos < offset) {
3005                         len = 0;
3006                         begin = pos;
3007                 }
3008                 if(pos > offset + length)
3009                         goto done;
3010         }
3011         *eof = 1;
3012
3013 done:
3014         read_unlock(&pfkey_table_lock);
3015
3016         *start = buffer + (offset - begin);
3017         len -= (offset - begin);
3018
3019         if (len > length)
3020                 len = length;
3021         if (len < 0)
3022                 len = 0;
3023
3024         return len;
3025 }
3026 #endif
3027
3028 static struct xfrm_mgr pfkeyv2_mgr =
3029 {
3030         .id             = "pfkeyv2",
3031         .notify         = pfkey_send_notify,
3032         .acquire        = pfkey_send_acquire,
3033         .compile_policy = pfkey_compile_policy,
3034         .new_mapping    = pfkey_send_new_mapping,
3035         .notify_policy  = pfkey_send_policy_notify,
3036 };
3037
3038 static void __exit ipsec_pfkey_exit(void)
3039 {
3040         xfrm_unregister_km(&pfkeyv2_mgr);
3041         remove_proc_entry("net/pfkey", NULL);
3042         sock_unregister(PF_KEY);
3043         proto_unregister(&key_proto);
3044 }
3045
3046 static int __init ipsec_pfkey_init(void)
3047 {
3048         int err = proto_register(&key_proto, 0);
3049
3050         if (err != 0)
3051                 goto out;
3052
3053         err = sock_register(&pfkey_family_ops);
3054         if (err != 0)
3055                 goto out_unregister_key_proto;
3056 #ifdef CONFIG_PROC_FS
3057         err = -ENOMEM;
3058         if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3059                 goto out_sock_unregister;
3060 #endif
3061         err = xfrm_register_km(&pfkeyv2_mgr);
3062         if (err != 0)
3063                 goto out_remove_proc_entry;
3064 out:
3065         return err;
3066 out_remove_proc_entry:
3067 #ifdef CONFIG_PROC_FS
3068         remove_proc_entry("net/pfkey", NULL);
3069 out_sock_unregister:
3070 #endif
3071         sock_unregister(PF_KEY);
3072 out_unregister_key_proto:
3073         proto_unregister(&key_proto);
3074         goto out;
3075 }
3076
3077 module_init(ipsec_pfkey_init);
3078 module_exit(ipsec_pfkey_exit);
3079 MODULE_LICENSE("GPL");
3080 MODULE_ALIAS_NETPROTO(PF_KEY);