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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/capability.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 const 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                                gfp_t 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, gfp_t 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         BUG_ON(err <= 0 || err >= 256);
 301
 302         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 303         pfkey_hdr_dup(hdr, orig);
 304         hdr->sadb_msg_errno = (uint8_t) err;
 305         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 306                              sizeof(uint64_t));
 307
 308         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 309
 310         return 0;
 311 }
 312
 313 static u8 sadb_ext_min_len[] = {
 314         [SADB_EXT_RESERVED]             = (u8) 0,
 315         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 316         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 317         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 318         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 319         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 320         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 321         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 322         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 323         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 324         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 325         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 326         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 327         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 328         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 329         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 330         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 331         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 332         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 333         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 334         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 335         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 336         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 337         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 338         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 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 inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 387 {
 388         int len = 0;
 389
 390         len += sizeof(struct sadb_x_sec_ctx);
 391         len += sec_ctx->sadb_x_ctx_len;
 392         len += sizeof(uint64_t) - 1;
 393         len /= sizeof(uint64_t);
 394
 395         return len;
 396 }
 397
 398 static inline int verify_sec_ctx_len(void *p)
 399 {
 400         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 401         int len;
 402
 403         if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE)
 404                 return -EINVAL;
 405
 406         len = pfkey_sec_ctx_len(sec_ctx);
 407
 408         if (sec_ctx->sadb_x_sec_len != len)
 409                 return -EINVAL;
 410
 411         return 0;
 412 }
 413
 414 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 415 {
 416         struct xfrm_user_sec_ctx *uctx = NULL;
 417         int ctx_size = sec_ctx->sadb_x_ctx_len;
 418
 419         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 420
 421         if (!uctx)
 422                 return NULL;
 423
 424         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 425         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 426         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 427         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 428         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 429         memcpy(uctx + 1, sec_ctx + 1,
 430                uctx->ctx_len);
 431
 432         return uctx;
 433 }
 434
 435 static int present_and_same_family(struct sadb_address *src,
 436                                    struct sadb_address *dst)
 437 {
 438         struct sockaddr *s_addr, *d_addr;
 439
 440         if (!src || !dst)
 441                 return 0;
 442
 443         s_addr = (struct sockaddr *)(src + 1);
 444         d_addr = (struct sockaddr *)(dst + 1);
 445         if (s_addr->sa_family != d_addr->sa_family)
 446                 return 0;
 447         if (s_addr->sa_family != AF_INET
 448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 449             && s_addr->sa_family != AF_INET6
 450 #endif
 451                 )
 452                 return 0;
 453
 454         return 1;
 455 }
 456
 457 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 458 {
 459         char *p = (char *) hdr;
 460         int len = skb->len;
 461
 462         len -= sizeof(*hdr);
 463         p += sizeof(*hdr);
 464         while (len > 0) {
 465                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 466                 uint16_t ext_type;
 467                 int ext_len;
 468
 469                 ext_len  = ehdr->sadb_ext_len;
 470                 ext_len *= sizeof(uint64_t);
 471                 ext_type = ehdr->sadb_ext_type;
 472                 if (ext_len < sizeof(uint64_t) ||
 473                     ext_len > len ||
 474                     ext_type == SADB_EXT_RESERVED)
 475                         return -EINVAL;
 476
 477                 if (ext_type <= SADB_EXT_MAX) {
 478                         int min = (int) sadb_ext_min_len[ext_type];
 479                         if (ext_len < min)
 480                                 return -EINVAL;
 481                         if (ext_hdrs[ext_type-1] != NULL)
 482                                 return -EINVAL;
 483                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 484                             ext_type == SADB_EXT_ADDRESS_DST ||
 485                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 486                             ext_type == SADB_X_EXT_NAT_T_OA) {
 487                                 if (verify_address_len(p))
 488                                         return -EINVAL;
 489                         }
 490                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 491                                 if (verify_sec_ctx_len(p))
 492                                         return -EINVAL;
 493                         }
 494                         ext_hdrs[ext_type-1] = p;
 495                 }
 496                 p   += ext_len;
 497                 len -= ext_len;
 498         }
 499
 500         return 0;
 501 }
 502
 503 static uint16_t
 504 pfkey_satype2proto(uint8_t satype)
 505 {
 506         switch (satype) {
 507         case SADB_SATYPE_UNSPEC:
 508                 return IPSEC_PROTO_ANY;
 509         case SADB_SATYPE_AH:
 510                 return IPPROTO_AH;
 511         case SADB_SATYPE_ESP:
 512                 return IPPROTO_ESP;
 513         case SADB_X_SATYPE_IPCOMP:
 514                 return IPPROTO_COMP;
 515                 break;
 516         default:
 517                 return 0;
 518         }
 519         /* NOTREACHED */
 520 }
 521
 522 static uint8_t
 523 pfkey_proto2satype(uint16_t proto)
 524 {
 525         switch (proto) {
 526         case IPPROTO_AH:
 527                 return SADB_SATYPE_AH;
 528         case IPPROTO_ESP:
 529                 return SADB_SATYPE_ESP;
 530         case IPPROTO_COMP:
 531                 return SADB_X_SATYPE_IPCOMP;
 532                 break;
 533         default:
 534                 return 0;
 535         }
 536         /* NOTREACHED */
 537 }
 538
 539 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 540  * say specifically 'just raw sockets' as we encode them as 255.
 541  */
 542
 543 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 544 {
 545         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 546 }
 547
 548 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 549 {
 550         return (proto ? proto : IPSEC_PROTO_ANY);
 551 }
 552
 553 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 554                                      xfrm_address_t *xaddr)
 555 {
 556         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 557         case AF_INET:
 558                 xaddr->a4 =
 559                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 560                 return AF_INET;
 561 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 562         case AF_INET6:
 563                 memcpy(xaddr->a6,
 564                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 565                        sizeof(struct in6_addr));
 566                 return AF_INET6;
 567 #endif
 568         default:
 569                 return 0;
 570         }
 571         /* NOTREACHED */
 572 }
 573
 574 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 575 {
 576         struct sadb_sa *sa;
 577         struct sadb_address *addr;
 578         uint16_t proto;
 579         unsigned short family;
 580         xfrm_address_t *xaddr;
 581
 582         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 583         if (sa == NULL)
 584                 return NULL;
 585
 586         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 587         if (proto == 0)
 588                 return NULL;
 589
 590         /* sadb_address_len should be checked by caller */
 591         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 592         if (addr == NULL)
 593                 return NULL;
 594
 595         family = ((struct sockaddr *)(addr + 1))->sa_family;
 596         switch (family) {
 597         case AF_INET:
 598                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 599                 break;
 600 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 601         case AF_INET6:
 602                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 603                 break;
 604 #endif
 605         default:
 606                 xaddr = NULL;
 607         }
 608
 609         if (!xaddr)
 610                 return NULL;
 611
 612         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 613 }
 614
 615 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 616 static int
 617 pfkey_sockaddr_size(sa_family_t family)
 618 {
 619         switch (family) {
 620         case AF_INET:
 621                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
 622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 623         case AF_INET6:
 624                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
 625 #endif
 626         default:
 627                 return 0;
 628         }
 629         /* NOTREACHED */
 630 }
 631
 632 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
 633 {
 634         struct sk_buff *skb;
 635         struct sadb_msg *hdr;
 636         struct sadb_sa *sa;
 637         struct sadb_lifetime *lifetime;
 638         struct sadb_address *addr;
 639         struct sadb_key *key;
 640         struct sadb_x_sa2 *sa2;
 641         struct sockaddr_in *sin;
 642         struct sadb_x_sec_ctx *sec_ctx;
 643         struct xfrm_sec_ctx *xfrm_ctx;
 644         int ctx_size = 0;
 645 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 646         struct sockaddr_in6 *sin6;
 647 #endif
 648         int size;
 649         int auth_key_size = 0;
 650         int encrypt_key_size = 0;
 651         int sockaddr_size;
 652         struct xfrm_encap_tmpl *natt = NULL;
 653
 654         /* address family check */
 655         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 656         if (!sockaddr_size)
 657                 return ERR_PTR(-EINVAL);
 658
 659         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 660            key(AE), (identity(SD),) (sensitivity)> */
 661         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 662                 sizeof(struct sadb_lifetime) +
 663                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 664                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 665                         sizeof(struct sadb_address)*2 +
 666                                 sockaddr_size*2 +
 667                                         sizeof(struct sadb_x_sa2);
 668
 669         if ((xfrm_ctx = x->security)) {
 670                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 671                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 672         }
 673
 674         /* identity & sensitivity */
 675
 676         if ((x->props.family == AF_INET &&
 677              x->sel.saddr.a4 != x->props.saddr.a4)
 678 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 679             || (x->props.family == AF_INET6 &&
 680                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 681 #endif
 682                 )
 683                 size += sizeof(struct sadb_address) + sockaddr_size;
 684
 685         if (add_keys) {
 686                 if (x->aalg && x->aalg->alg_key_len) {
 687                         auth_key_size =
 688                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 689                         size += sizeof(struct sadb_key) + auth_key_size;
 690                 }
 691                 if (x->ealg && x->ealg->alg_key_len) {
 692                         encrypt_key_size =
 693                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 694                         size += sizeof(struct sadb_key) + encrypt_key_size;
 695                 }
 696         }
 697         if (x->encap)
 698                 natt = x->encap;
 699
 700         if (natt && natt->encap_type) {
 701                 size += sizeof(struct sadb_x_nat_t_type);
 702                 size += sizeof(struct sadb_x_nat_t_port);
 703                 size += sizeof(struct sadb_x_nat_t_port);
 704         }
 705
 706         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 707         if (skb == NULL)
 708                 return ERR_PTR(-ENOBUFS);
 709
 710         /* call should fill header later */
 711         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 712         memset(hdr, 0, size);   /* XXX do we need this ? */
 713         hdr->sadb_msg_len = size / sizeof(uint64_t);
 714
 715         /* sa */
 716         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 717         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 718         sa->sadb_sa_exttype = SADB_EXT_SA;
 719         sa->sadb_sa_spi = x->id.spi;
 720         sa->sadb_sa_replay = x->props.replay_window;
 721         switch (x->km.state) {
 722         case XFRM_STATE_VALID:
 723                 sa->sadb_sa_state = x->km.dying ?
 724                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 725                 break;
 726         case XFRM_STATE_ACQ:
 727                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 728                 break;
 729         default:
 730                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 731                 break;
 732         }
 733         sa->sadb_sa_auth = 0;
 734         if (x->aalg) {
 735                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 736                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 737         }
 738         sa->sadb_sa_encrypt = 0;
 739         BUG_ON(x->ealg && x->calg);
 740         if (x->ealg) {
 741                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 742                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 743         }
 744         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 745         if (x->calg) {
 746                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 747                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 748         }
 749
 750         sa->sadb_sa_flags = 0;
 751         if (x->props.flags & XFRM_STATE_NOECN)
 752                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 753         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 754                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 755         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 756                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 757
 758         /* hard time */
 759         if (hsc & 2) {
 760                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 761                                                              sizeof(struct sadb_lifetime));
 762                 lifetime->sadb_lifetime_len =
 763                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 764                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 765                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 766                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 767                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 768                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 769         }
 770         /* soft time */
 771         if (hsc & 1) {
 772                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 773                                                              sizeof(struct sadb_lifetime));
 774                 lifetime->sadb_lifetime_len =
 775                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 776                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 777                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 778                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 779                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 780                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 781         }
 782         /* current time */
 783         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 784                                                      sizeof(struct sadb_lifetime));
 785         lifetime->sadb_lifetime_len =
 786                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 787         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 788         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 789         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 790         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 791         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 792         /* src address */
 793         addr = (struct sadb_address*) skb_put(skb,
 794                                               sizeof(struct sadb_address)+sockaddr_size);
 795         addr->sadb_address_len =
 796                 (sizeof(struct sadb_address)+sockaddr_size)/
 797                         sizeof(uint64_t);
 798         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 799         /* "if the ports are non-zero, then the sadb_address_proto field,
 800            normally zero, MUST be filled in with the transport
 801            protocol's number." - RFC2367 */
 802         addr->sadb_address_proto = 0;
 803         addr->sadb_address_reserved = 0;
 804         if (x->props.family == AF_INET) {
 805                 addr->sadb_address_prefixlen = 32;
 806
 807                 sin = (struct sockaddr_in *) (addr + 1);
 808                 sin->sin_family = AF_INET;
 809                 sin->sin_addr.s_addr = x->props.saddr.a4;
 810                 sin->sin_port = 0;
 811                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 812         }
 813 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 814         else if (x->props.family == AF_INET6) {
 815                 addr->sadb_address_prefixlen = 128;
 816
 817                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 818                 sin6->sin6_family = AF_INET6;
 819                 sin6->sin6_port = 0;
 820                 sin6->sin6_flowinfo = 0;
 821                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 822                        sizeof(struct in6_addr));
 823                 sin6->sin6_scope_id = 0;
 824         }
 825 #endif
 826         else
 827                 BUG();
 828
 829         /* dst address */
 830         addr = (struct sadb_address*) skb_put(skb,
 831                                               sizeof(struct sadb_address)+sockaddr_size);
 832         addr->sadb_address_len =
 833                 (sizeof(struct sadb_address)+sockaddr_size)/
 834                         sizeof(uint64_t);
 835         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 836         addr->sadb_address_proto = 0;
 837         addr->sadb_address_prefixlen = 32; /* XXX */
 838         addr->sadb_address_reserved = 0;
 839         if (x->props.family == AF_INET) {
 840                 sin = (struct sockaddr_in *) (addr + 1);
 841                 sin->sin_family = AF_INET;
 842                 sin->sin_addr.s_addr = x->id.daddr.a4;
 843                 sin->sin_port = 0;
 844                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 845
 846                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 847                         addr = (struct sadb_address*) skb_put(skb,
 848                                 sizeof(struct sadb_address)+sockaddr_size);
 849                         addr->sadb_address_len =
 850                                 (sizeof(struct sadb_address)+sockaddr_size)/
 851                                 sizeof(uint64_t);
 852                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 853                         addr->sadb_address_proto =
 854                                 pfkey_proto_from_xfrm(x->sel.proto);
 855                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 856                         addr->sadb_address_reserved = 0;
 857
 858                         sin = (struct sockaddr_in *) (addr + 1);
 859                         sin->sin_family = AF_INET;
 860                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 861                         sin->sin_port = x->sel.sport;
 862                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 863                 }
 864         }
 865 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 866         else if (x->props.family == AF_INET6) {
 867                 addr->sadb_address_prefixlen = 128;
 868
 869                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 870                 sin6->sin6_family = AF_INET6;
 871                 sin6->sin6_port = 0;
 872                 sin6->sin6_flowinfo = 0;
 873                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 874                 sin6->sin6_scope_id = 0;
 875
 876                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 877                             sizeof(struct in6_addr))) {
 878                         addr = (struct sadb_address *) skb_put(skb,
 879                                 sizeof(struct sadb_address)+sockaddr_size);
 880                         addr->sadb_address_len =
 881                                 (sizeof(struct sadb_address)+sockaddr_size)/
 882                                 sizeof(uint64_t);
 883                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 884                         addr->sadb_address_proto =
 885                                 pfkey_proto_from_xfrm(x->sel.proto);
 886                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 887                         addr->sadb_address_reserved = 0;
 888
 889                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 890                         sin6->sin6_family = AF_INET6;
 891                         sin6->sin6_port = x->sel.sport;
 892                         sin6->sin6_flowinfo = 0;
 893                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 894                                sizeof(struct in6_addr));
 895                         sin6->sin6_scope_id = 0;
 896                 }
 897         }
 898 #endif
 899         else
 900                 BUG();
 901
 902         /* auth key */
 903         if (add_keys && auth_key_size) {
 904                 key = (struct sadb_key *) skb_put(skb,
 905                                                   sizeof(struct sadb_key)+auth_key_size);
 906                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 907                         sizeof(uint64_t);
 908                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 909                 key->sadb_key_bits = x->aalg->alg_key_len;
 910                 key->sadb_key_reserved = 0;
 911                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 912         }
 913         /* encrypt key */
 914         if (add_keys && encrypt_key_size) {
 915                 key = (struct sadb_key *) skb_put(skb,
 916                                                   sizeof(struct sadb_key)+encrypt_key_size);
 917                 key->sadb_key_len = (sizeof(struct sadb_key) +
 918                                      encrypt_key_size) / sizeof(uint64_t);
 919                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 920                 key->sadb_key_bits = x->ealg->alg_key_len;
 921                 key->sadb_key_reserved = 0;
 922                 memcpy(key + 1, x->ealg->alg_key,
 923                        (x->ealg->alg_key_len+7)/8);
 924         }
 925
 926         /* sa */
 927         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 928         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 929         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 930         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 931         sa2->sadb_x_sa2_reserved1 = 0;
 932         sa2->sadb_x_sa2_reserved2 = 0;
 933         sa2->sadb_x_sa2_sequence = 0;
 934         sa2->sadb_x_sa2_reqid = x->props.reqid;
 935
 936         if (natt && natt->encap_type) {
 937                 struct sadb_x_nat_t_type *n_type;
 938                 struct sadb_x_nat_t_port *n_port;
 939
 940                 /* type */
 941                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 942                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 943                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 944                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 945                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 946                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 947                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 948
 949                 /* source port */
 950                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 951                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 952                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 953                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 954                 n_port->sadb_x_nat_t_port_reserved = 0;
 955
 956                 /* dest port */
 957                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 958                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 959                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 960                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 961                 n_port->sadb_x_nat_t_port_reserved = 0;
 962         }
 963
 964         /* security context */
 965         if (xfrm_ctx) {
 966                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
 967                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
 968                 sec_ctx->sadb_x_sec_len =
 969                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
 970                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
 971                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
 972                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
 973                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
 974                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
 975                        xfrm_ctx->ctx_len);
 976         }
 977
 978         return skb;
 979 }
 980
 981 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 982                                                 void **ext_hdrs)
 983 {
 984         struct xfrm_state *x;
 985         struct sadb_lifetime *lifetime;
 986         struct sadb_sa *sa;
 987         struct sadb_key *key;
 988         struct sadb_x_sec_ctx *sec_ctx;
 989         uint16_t proto;
 990         int err;
 991
 992
 993         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 994         if (!sa ||
 995             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 996                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 997                 return ERR_PTR(-EINVAL);
 998         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
 999             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1000                 return ERR_PTR(-EINVAL);
1001         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1002             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1003                 return ERR_PTR(-EINVAL);
1004         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1005             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1006                 return ERR_PTR(-EINVAL);
1007
1008         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1009         if (proto == 0)
1010                 return ERR_PTR(-EINVAL);
1011
1012         /* default error is no buffer space */
1013         err = -ENOBUFS;
1014
1015         /* RFC2367:
1016
1017    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1018    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1019    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1020    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1021    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1022    not true.
1023
1024            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1025            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1026          */
1027         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1028             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1029              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1030             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1031                 return ERR_PTR(-EINVAL);
1032         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1033         if (key != NULL &&
1034             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1035             ((key->sadb_key_bits+7) / 8 == 0 ||
1036              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1037                 return ERR_PTR(-EINVAL);
1038         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1039         if (key != NULL &&
1040             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1041             ((key->sadb_key_bits+7) / 8 == 0 ||
1042              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1043                 return ERR_PTR(-EINVAL);
1044
1045         x = xfrm_state_alloc();
1046         if (x == NULL)
1047                 return ERR_PTR(-ENOBUFS);
1048
1049         x->id.proto = proto;
1050         x->id.spi = sa->sadb_sa_spi;
1051         x->props.replay_window = sa->sadb_sa_replay;
1052         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1053                 x->props.flags |= XFRM_STATE_NOECN;
1054         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1055                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1056         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1057                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1058
1059         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1060         if (lifetime != NULL) {
1061                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1062                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1063                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1064                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1065         }
1066         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1067         if (lifetime != NULL) {
1068                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1069                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1070                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1071                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1072         }
1073
1074         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1075         if (sec_ctx != NULL) {
1076                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1077
1078                 if (!uctx)
1079                         goto out;
1080
1081                 err = security_xfrm_state_alloc(x, uctx);
1082                 kfree(uctx);
1083
1084                 if (err)
1085                         goto out;
1086         }
1087
1088         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1089         if (sa->sadb_sa_auth) {
1090                 int keysize = 0;
1091                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1092                 if (!a) {
1093                         err = -ENOSYS;
1094                         goto out;
1095                 }
1096                 if (key)
1097                         keysize = (key->sadb_key_bits + 7) / 8;
1098                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1099                 if (!x->aalg)
1100                         goto out;
1101                 strcpy(x->aalg->alg_name, a->name);
1102                 x->aalg->alg_key_len = 0;
1103                 if (key) {
1104                         x->aalg->alg_key_len = key->sadb_key_bits;
1105                         memcpy(x->aalg->alg_key, key+1, keysize);
1106                 }
1107                 x->props.aalgo = sa->sadb_sa_auth;
1108                 /* x->algo.flags = sa->sadb_sa_flags; */
1109         }
1110         if (sa->sadb_sa_encrypt) {
1111                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1112                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1113                         if (!a) {
1114                                 err = -ENOSYS;
1115                                 goto out;
1116                         }
1117                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1118                         if (!x->calg)
1119                                 goto out;
1120                         strcpy(x->calg->alg_name, a->name);
1121                         x->props.calgo = sa->sadb_sa_encrypt;
1122                 } else {
1123                         int keysize = 0;
1124                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1125                         if (!a) {
1126                                 err = -ENOSYS;
1127                                 goto out;
1128                         }
1129                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1130                         if (key)
1131                                 keysize = (key->sadb_key_bits + 7) / 8;
1132                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1133                         if (!x->ealg)
1134                                 goto out;
1135                         strcpy(x->ealg->alg_name, a->name);
1136                         x->ealg->alg_key_len = 0;
1137                         if (key) {
1138                                 x->ealg->alg_key_len = key->sadb_key_bits;
1139                                 memcpy(x->ealg->alg_key, key+1, keysize);
1140                         }
1141                         x->props.ealgo = sa->sadb_sa_encrypt;
1142                 }
1143         }
1144         /* x->algo.flags = sa->sadb_sa_flags; */
1145
1146         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1147                                                     &x->props.saddr);
1148         if (!x->props.family) {
1149                 err = -EAFNOSUPPORT;
1150                 goto out;
1151         }
1152         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1153                                   &x->id.daddr);
1154
1155         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1156                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1157                 x->props.mode = sa2->sadb_x_sa2_mode;
1158                 if (x->props.mode)
1159                         x->props.mode--;
1160                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1161         }
1162
1163         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1164                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1165
1166                 /* Nobody uses this, but we try. */
1167                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1168                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1169         }
1170
1171         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1172                 struct sadb_x_nat_t_type* n_type;
1173                 struct xfrm_encap_tmpl *natt;
1174
1175                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1176                 if (!x->encap)
1177                         goto out;
1178
1179                 natt = x->encap;
1180                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1181                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1182
1183                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1184                         struct sadb_x_nat_t_port* n_port =
1185                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1186                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1187                 }
1188                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1189                         struct sadb_x_nat_t_port* n_port =
1190                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1191                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1192                 }
1193         }
1194
1195         err = xfrm_init_state(x);
1196         if (err)
1197                 goto out;
1198
1199         x->km.seq = hdr->sadb_msg_seq;
1200         return x;
1201
1202 out:
1203         x->km.state = XFRM_STATE_DEAD;
1204         xfrm_state_put(x);
1205         return ERR_PTR(err);
1206 }
1207
1208 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1209 {
1210         return -EOPNOTSUPP;
1211 }
1212
1213 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1214 {
1215         struct sk_buff *resp_skb;
1216         struct sadb_x_sa2 *sa2;
1217         struct sadb_address *saddr, *daddr;
1218         struct sadb_msg *out_hdr;
1219         struct xfrm_state *x = NULL;
1220         u8 mode;
1221         u32 reqid;
1222         u8 proto;
1223         unsigned short family;
1224         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1225
1226         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1227                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1228                 return -EINVAL;
1229
1230         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1231         if (proto == 0)
1232                 return -EINVAL;
1233
1234         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1235                 mode = sa2->sadb_x_sa2_mode - 1;
1236                 reqid = sa2->sadb_x_sa2_reqid;
1237         } else {
1238                 mode = 0;
1239                 reqid = 0;
1240         }
1241
1242         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1243         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1244
1245         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1246         switch (family) {
1247         case AF_INET:
1248                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1249                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1250                 break;
1251 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1252         case AF_INET6:
1253                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1254                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1255                 break;
1256 #endif
1257         }
1258
1259         if (hdr->sadb_msg_seq) {
1260                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1261                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1262                         xfrm_state_put(x);
1263                         x = NULL;
1264                 }
1265         }
1266
1267         if (!x)
1268                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1269
1270         if (x == NULL)
1271                 return -ENOENT;
1272
1273         resp_skb = ERR_PTR(-ENOENT);
1274
1275         spin_lock_bh(&x->lock);
1276         if (x->km.state != XFRM_STATE_DEAD) {
1277                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1278                 u32 min_spi, max_spi;
1279
1280                 if (range != NULL) {
1281                         min_spi = range->sadb_spirange_min;
1282                         max_spi = range->sadb_spirange_max;
1283                 } else {
1284                         min_spi = 0x100;
1285                         max_spi = 0x0fffffff;
1286                 }
1287                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1288                 if (x->id.spi)
1289                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1290         }
1291         spin_unlock_bh(&x->lock);
1292
1293         if (IS_ERR(resp_skb)) {
1294                 xfrm_state_put(x);
1295                 return  PTR_ERR(resp_skb);
1296         }
1297
1298         out_hdr = (struct sadb_msg *) resp_skb->data;
1299         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1300         out_hdr->sadb_msg_type = SADB_GETSPI;
1301         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1302         out_hdr->sadb_msg_errno = 0;
1303         out_hdr->sadb_msg_reserved = 0;
1304         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1305         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1306
1307         xfrm_state_put(x);
1308
1309         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1310
1311         return 0;
1312 }
1313
1314 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1315 {
1316         struct xfrm_state *x;
1317
1318         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1319                 return -EOPNOTSUPP;
1320
1321         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1322                 return 0;
1323
1324         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1325         if (x == NULL)
1326                 return 0;
1327
1328         spin_lock_bh(&x->lock);
1329         if (x->km.state == XFRM_STATE_ACQ) {
1330                 x->km.state = XFRM_STATE_ERROR;
1331                 wake_up(&km_waitq);
1332         }
1333         spin_unlock_bh(&x->lock);
1334         xfrm_state_put(x);
1335         return 0;
1336 }
1337
1338 static inline int event2poltype(int event)
1339 {
1340         switch (event) {
1341         case XFRM_MSG_DELPOLICY:
1342                 return SADB_X_SPDDELETE;
1343         case XFRM_MSG_NEWPOLICY:
1344                 return SADB_X_SPDADD;
1345         case XFRM_MSG_UPDPOLICY:
1346                 return SADB_X_SPDUPDATE;
1347         case XFRM_MSG_POLEXPIRE:
1348         //      return SADB_X_SPDEXPIRE;
1349         default:
1350                 printk("pfkey: Unknown policy event %d\n", event);
1351                 break;
1352         }
1353
1354         return 0;
1355 }
1356
1357 static inline int event2keytype(int event)
1358 {
1359         switch (event) {
1360         case XFRM_MSG_DELSA:
1361                 return SADB_DELETE;
1362         case XFRM_MSG_NEWSA:
1363                 return SADB_ADD;
1364         case XFRM_MSG_UPDSA:
1365                 return SADB_UPDATE;
1366         case XFRM_MSG_EXPIRE:
1367                 return SADB_EXPIRE;
1368         default:
1369                 printk("pfkey: Unknown SA event %d\n", event);
1370                 break;
1371         }
1372
1373         return 0;
1374 }
1375
1376 /* ADD/UPD/DEL */
1377 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1378 {
1379         struct sk_buff *skb;
1380         struct sadb_msg *hdr;
1381         int hsc = 3;
1382
1383         if (c->event == XFRM_MSG_DELSA)
1384                 hsc = 0;
1385
1386         skb = pfkey_xfrm_state2msg(x, 0, hsc);
1387
1388         if (IS_ERR(skb))
1389                 return PTR_ERR(skb);
1390
1391         hdr = (struct sadb_msg *) skb->data;
1392         hdr->sadb_msg_version = PF_KEY_V2;
1393         hdr->sadb_msg_type = event2keytype(c->event);
1394         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1395         hdr->sadb_msg_errno = 0;
1396         hdr->sadb_msg_reserved = 0;
1397         hdr->sadb_msg_seq = c->seq;
1398         hdr->sadb_msg_pid = c->pid;
1399
1400         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1401
1402         return 0;
1403 }
1404
1405 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1406 {
1407         struct xfrm_state *x;
1408         int err;
1409         struct km_event c;
1410
1411         xfrm_probe_algs();
1412
1413         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1414         if (IS_ERR(x))
1415                 return PTR_ERR(x);
1416
1417         xfrm_state_hold(x);
1418         if (hdr->sadb_msg_type == SADB_ADD)
1419                 err = xfrm_state_add(x);
1420         else
1421                 err = xfrm_state_update(x);
1422
1423         if (err < 0) {
1424                 x->km.state = XFRM_STATE_DEAD;
1425                 __xfrm_state_put(x);
1426                 goto out;
1427         }
1428
1429         if (hdr->sadb_msg_type == SADB_ADD)
1430                 c.event = XFRM_MSG_NEWSA;
1431         else
1432                 c.event = XFRM_MSG_UPDSA;
1433         c.seq = hdr->sadb_msg_seq;
1434         c.pid = hdr->sadb_msg_pid;
1435         km_state_notify(x, &c);
1436 out:
1437         xfrm_state_put(x);
1438         return err;
1439 }
1440
1441 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1442 {
1443         struct xfrm_state *x;
1444         struct km_event c;
1445         int err;
1446
1447         if (!ext_hdrs[SADB_EXT_SA-1] ||
1448             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1449                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1450                 return -EINVAL;
1451
1452         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1453         if (x == NULL)
1454                 return -ESRCH;
1455
1456         if ((err = security_xfrm_state_delete(x)))
1457                 goto out;
1458
1459         if (xfrm_state_kern(x)) {
1460                 err = -EPERM;
1461                 goto out;
1462         }
1463
1464         err = xfrm_state_delete(x);
1465         if (err < 0)
1466                 goto out;
1467
1468         c.seq = hdr->sadb_msg_seq;
1469         c.pid = hdr->sadb_msg_pid;
1470         c.event = XFRM_MSG_DELSA;
1471         km_state_notify(x, &c);
1472 out:
1473         xfrm_state_put(x);
1474
1475         return err;
1476 }
1477
1478 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1479 {
1480         __u8 proto;
1481         struct sk_buff *out_skb;
1482         struct sadb_msg *out_hdr;
1483         struct xfrm_state *x;
1484
1485         if (!ext_hdrs[SADB_EXT_SA-1] ||
1486             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1487                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1488                 return -EINVAL;
1489
1490         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1491         if (x == NULL)
1492                 return -ESRCH;
1493
1494         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1495         proto = x->id.proto;
1496         xfrm_state_put(x);
1497         if (IS_ERR(out_skb))
1498                 return  PTR_ERR(out_skb);
1499
1500         out_hdr = (struct sadb_msg *) out_skb->data;
1501         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1502         out_hdr->sadb_msg_type = SADB_DUMP;
1503         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1504         out_hdr->sadb_msg_errno = 0;
1505         out_hdr->sadb_msg_reserved = 0;
1506         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1507         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1508         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1509
1510         return 0;
1511 }
1512
1513 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1514                                               gfp_t allocation)
1515 {
1516         struct sk_buff *skb;
1517         struct sadb_msg *hdr;
1518         int len, auth_len, enc_len, i;
1519
1520         auth_len = xfrm_count_auth_supported();
1521         if (auth_len) {
1522                 auth_len *= sizeof(struct sadb_alg);
1523                 auth_len += sizeof(struct sadb_supported);
1524         }
1525
1526         enc_len = xfrm_count_enc_supported();
1527         if (enc_len) {
1528                 enc_len *= sizeof(struct sadb_alg);
1529                 enc_len += sizeof(struct sadb_supported);
1530         }
1531
1532         len = enc_len + auth_len + sizeof(struct sadb_msg);
1533
1534         skb = alloc_skb(len + 16, allocation);
1535         if (!skb)
1536                 goto out_put_algs;
1537
1538         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1539         pfkey_hdr_dup(hdr, orig);
1540         hdr->sadb_msg_errno = 0;
1541         hdr->sadb_msg_len = len / sizeof(uint64_t);
1542
1543         if (auth_len) {
1544                 struct sadb_supported *sp;
1545                 struct sadb_alg *ap;
1546
1547                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1548                 ap = (struct sadb_alg *) (sp + 1);
1549
1550                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1551                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1552
1553                 for (i = 0; ; i++) {
1554                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1555                         if (!aalg)
1556                                 break;
1557                         if (aalg->available)
1558                                 *ap++ = aalg->desc;
1559                 }
1560         }
1561
1562         if (enc_len) {
1563                 struct sadb_supported *sp;
1564                 struct sadb_alg *ap;
1565
1566                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1567                 ap = (struct sadb_alg *) (sp + 1);
1568
1569                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1570                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1571
1572                 for (i = 0; ; i++) {
1573                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1574                         if (!ealg)
1575                                 break;
1576                         if (ealg->available)
1577                                 *ap++ = ealg->desc;
1578                 }
1579         }
1580
1581 out_put_algs:
1582         return skb;
1583 }
1584
1585 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1586 {
1587         struct pfkey_sock *pfk = pfkey_sk(sk);
1588         struct sk_buff *supp_skb;
1589
1590         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1591                 return -EINVAL;
1592
1593         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1594                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1595                         return -EEXIST;
1596                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1597         }
1598
1599         xfrm_probe_algs();
1600
1601         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1602         if (!supp_skb) {
1603                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1604                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1605
1606                 return -ENOBUFS;
1607         }
1608
1609         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1610
1611         return 0;
1612 }
1613
1614 static int key_notify_sa_flush(struct km_event *c)
1615 {
1616         struct sk_buff *skb;
1617         struct sadb_msg *hdr;
1618
1619         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1620         if (!skb)
1621                 return -ENOBUFS;
1622         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1623         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1624         hdr->sadb_msg_type = SADB_FLUSH;
1625         hdr->sadb_msg_seq = c->seq;
1626         hdr->sadb_msg_pid = c->pid;
1627         hdr->sadb_msg_version = PF_KEY_V2;
1628         hdr->sadb_msg_errno = (uint8_t) 0;
1629         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1630
1631         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1632
1633         return 0;
1634 }
1635
1636 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1637 {
1638         unsigned proto;
1639         struct km_event c;
1640
1641         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1642         if (proto == 0)
1643                 return -EINVAL;
1644
1645         xfrm_state_flush(proto);
1646         c.data.proto = proto;
1647         c.seq = hdr->sadb_msg_seq;
1648         c.pid = hdr->sadb_msg_pid;
1649         c.event = XFRM_MSG_FLUSHSA;
1650         km_state_notify(NULL, &c);
1651
1652         return 0;
1653 }
1654
1655 struct pfkey_dump_data
1656 {
1657         struct sk_buff *skb;
1658         struct sadb_msg *hdr;
1659         struct sock *sk;
1660 };
1661
1662 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1663 {
1664         struct pfkey_dump_data *data = ptr;
1665         struct sk_buff *out_skb;
1666         struct sadb_msg *out_hdr;
1667
1668         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1669         if (IS_ERR(out_skb))
1670                 return PTR_ERR(out_skb);
1671
1672         out_hdr = (struct sadb_msg *) out_skb->data;
1673         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1674         out_hdr->sadb_msg_type = SADB_DUMP;
1675         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1676         out_hdr->sadb_msg_errno = 0;
1677         out_hdr->sadb_msg_reserved = 0;
1678         out_hdr->sadb_msg_seq = count;
1679         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1680         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1681         return 0;
1682 }
1683
1684 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1685 {
1686         u8 proto;
1687         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1688
1689         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1690         if (proto == 0)
1691                 return -EINVAL;
1692
1693         return xfrm_state_walk(proto, dump_sa, &data);
1694 }
1695
1696 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1697 {
1698         struct pfkey_sock *pfk = pfkey_sk(sk);
1699         int satype = hdr->sadb_msg_satype;
1700
1701         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1702                 /* XXX we mangle packet... */
1703                 hdr->sadb_msg_errno = 0;
1704                 if (satype != 0 && satype != 1)
1705                         return -EINVAL;
1706                 pfk->promisc = satype;
1707         }
1708         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1709         return 0;
1710 }
1711
1712 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1713 {
1714         int i;
1715         u32 reqid = *(u32*)ptr;
1716
1717         for (i=0; i<xp->xfrm_nr; i++) {
1718                 if (xp->xfrm_vec[i].reqid == reqid)
1719                         return -EEXIST;
1720         }
1721         return 0;
1722 }
1723
1724 static u32 gen_reqid(void)
1725 {
1726         u32 start;
1727         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1728
1729         start = reqid;
1730         do {
1731                 ++reqid;
1732                 if (reqid == 0)
1733                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1734                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1735                         return reqid;
1736         } while (reqid != start);
1737         return 0;
1738 }
1739
1740 static int
1741 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1742 {
1743         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1744         struct sockaddr_in *sin;
1745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1746         struct sockaddr_in6 *sin6;
1747 #endif
1748
1749         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1750                 return -ELOOP;
1751
1752         if (rq->sadb_x_ipsecrequest_mode == 0)
1753                 return -EINVAL;
1754
1755         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1756         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1757         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1758                 t->optional = 1;
1759         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1760                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1761                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1762                         t->reqid = 0;
1763                 if (!t->reqid && !(t->reqid = gen_reqid()))
1764                         return -ENOBUFS;
1765         }
1766
1767         /* addresses present only in tunnel mode */
1768         if (t->mode) {
1769                 switch (xp->family) {
1770                 case AF_INET:
1771                         sin = (void*)(rq+1);
1772                         if (sin->sin_family != AF_INET)
1773                                 return -EINVAL;
1774                         t->saddr.a4 = sin->sin_addr.s_addr;
1775                         sin++;
1776                         if (sin->sin_family != AF_INET)
1777                                 return -EINVAL;
1778                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1779                         break;
1780 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1781                 case AF_INET6:
1782                         sin6 = (void *)(rq+1);
1783                         if (sin6->sin6_family != AF_INET6)
1784                                 return -EINVAL;
1785                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1786                         sin6++;
1787                         if (sin6->sin6_family != AF_INET6)
1788                                 return -EINVAL;
1789                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1790                         break;
1791 #endif
1792                 default:
1793                         return -EINVAL;
1794                 }
1795         }
1796         /* No way to set this via kame pfkey */
1797         t->aalgos = t->ealgos = t->calgos = ~0;
1798         xp->xfrm_nr++;
1799         return 0;
1800 }
1801
1802 static int
1803 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1804 {
1805         int err;
1806         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1807         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1808
1809         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1810                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1811                         return err;
1812                 len -= rq->sadb_x_ipsecrequest_len;
1813                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1814         }
1815         return 0;
1816 }
1817
1818 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1819 {
1820   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1821
1822         if (xfrm_ctx) {
1823                 int len = sizeof(struct sadb_x_sec_ctx);
1824                 len += xfrm_ctx->ctx_len;
1825                 return PFKEY_ALIGN8(len);
1826         }
1827         return 0;
1828 }
1829
1830 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1831 {
1832         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1833         int socklen = (xp->family == AF_INET ?
1834                        sizeof(struct sockaddr_in) :
1835                        sizeof(struct sockaddr_in6));
1836
1837         return sizeof(struct sadb_msg) +
1838                 (sizeof(struct sadb_lifetime) * 3) +
1839                 (sizeof(struct sadb_address) * 2) +
1840                 (sockaddr_size * 2) +
1841                 sizeof(struct sadb_x_policy) +
1842                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1843                                 (socklen * 2))) +
1844                 pfkey_xfrm_policy2sec_ctx_size(xp);
1845 }
1846
1847 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1848 {
1849         struct sk_buff *skb;
1850         int size;
1851
1852         size = pfkey_xfrm_policy2msg_size(xp);
1853
1854         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1855         if (skb == NULL)
1856                 return ERR_PTR(-ENOBUFS);
1857
1858         return skb;
1859 }
1860
1861 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1862 {
1863         struct sadb_msg *hdr;
1864         struct sadb_address *addr;
1865         struct sadb_lifetime *lifetime;
1866         struct sadb_x_policy *pol;
1867         struct sockaddr_in   *sin;
1868         struct sadb_x_sec_ctx *sec_ctx;
1869         struct xfrm_sec_ctx *xfrm_ctx;
1870 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1871         struct sockaddr_in6  *sin6;
1872 #endif
1873         int i;
1874         int size;
1875         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1876         int socklen = (xp->family == AF_INET ?
1877                        sizeof(struct sockaddr_in) :
1878                        sizeof(struct sockaddr_in6));
1879
1880         size = pfkey_xfrm_policy2msg_size(xp);
1881
1882         /* call should fill header later */
1883         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1884         memset(hdr, 0, size);   /* XXX do we need this ? */
1885
1886         /* src address */
1887         addr = (struct sadb_address*) skb_put(skb,
1888                                               sizeof(struct sadb_address)+sockaddr_size);
1889         addr->sadb_address_len =
1890                 (sizeof(struct sadb_address)+sockaddr_size)/
1891                         sizeof(uint64_t);
1892         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1893         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1894         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1895         addr->sadb_address_reserved = 0;
1896         /* src address */
1897         if (xp->family == AF_INET) {
1898                 sin = (struct sockaddr_in *) (addr + 1);
1899                 sin->sin_family = AF_INET;
1900                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1901                 sin->sin_port = xp->selector.sport;
1902                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1903         }
1904 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1905         else if (xp->family == AF_INET6) {
1906                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1907                 sin6->sin6_family = AF_INET6;
1908                 sin6->sin6_port = xp->selector.sport;
1909                 sin6->sin6_flowinfo = 0;
1910                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1911                        sizeof(struct in6_addr));
1912                 sin6->sin6_scope_id = 0;
1913         }
1914 #endif
1915         else
1916                 BUG();
1917
1918         /* dst address */
1919         addr = (struct sadb_address*) skb_put(skb,
1920                                               sizeof(struct sadb_address)+sockaddr_size);
1921         addr->sadb_address_len =
1922                 (sizeof(struct sadb_address)+sockaddr_size)/
1923                         sizeof(uint64_t);
1924         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1925         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1926         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1927         addr->sadb_address_reserved = 0;
1928         if (xp->family == AF_INET) {
1929                 sin = (struct sockaddr_in *) (addr + 1);
1930                 sin->sin_family = AF_INET;
1931                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1932                 sin->sin_port = xp->selector.dport;
1933                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1934         }
1935 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1936         else if (xp->family == AF_INET6) {
1937                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1938                 sin6->sin6_family = AF_INET6;
1939                 sin6->sin6_port = xp->selector.dport;
1940                 sin6->sin6_flowinfo = 0;
1941                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1942                        sizeof(struct in6_addr));
1943                 sin6->sin6_scope_id = 0;
1944         }
1945 #endif
1946         else
1947                 BUG();
1948
1949         /* hard time */
1950         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1951                                                      sizeof(struct sadb_lifetime));
1952         lifetime->sadb_lifetime_len =
1953                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1954         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1955         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1956         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1957         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1958         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1959         /* soft time */
1960         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1961                                                      sizeof(struct sadb_lifetime));
1962         lifetime->sadb_lifetime_len =
1963                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1964         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1965         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1966         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1967         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1968         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1969         /* current time */
1970         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1971                                                      sizeof(struct sadb_lifetime));
1972         lifetime->sadb_lifetime_len =
1973                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1974         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1975         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1976         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1977         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1978         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1979
1980         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1981         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1982         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1983         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1984         if (xp->action == XFRM_POLICY_ALLOW) {
1985                 if (xp->xfrm_nr)
1986                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1987                 else
1988                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1989         }
1990         pol->sadb_x_policy_dir = dir+1;
1991         pol->sadb_x_policy_id = xp->index;
1992         pol->sadb_x_policy_priority = xp->priority;
1993
1994         for (i=0; i<xp->xfrm_nr; i++) {
1995                 struct sadb_x_ipsecrequest *rq;
1996                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1997                 int req_size;
1998
1999                 req_size = sizeof(struct sadb_x_ipsecrequest);
2000                 if (t->mode)
2001                         req_size += 2*socklen;
2002                 else
2003                         size -= 2*socklen;
2004                 rq = (void*)skb_put(skb, req_size);
2005                 pol->sadb_x_policy_len += req_size/8;
2006                 memset(rq, 0, sizeof(*rq));
2007                 rq->sadb_x_ipsecrequest_len = req_size;
2008                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2009                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
2010                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2011                 if (t->reqid)
2012                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2013                 if (t->optional)
2014                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2015                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2016                 if (t->mode) {
2017                         switch (xp->family) {
2018                         case AF_INET:
2019                                 sin = (void*)(rq+1);
2020                                 sin->sin_family = AF_INET;
2021                                 sin->sin_addr.s_addr = t->saddr.a4;
2022                                 sin->sin_port = 0;
2023                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2024                                 sin++;
2025                                 sin->sin_family = AF_INET;
2026                                 sin->sin_addr.s_addr = t->id.daddr.a4;
2027                                 sin->sin_port = 0;
2028                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2029                                 break;
2030 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2031                         case AF_INET6:
2032                                 sin6 = (void*)(rq+1);
2033                                 sin6->sin6_family = AF_INET6;
2034                                 sin6->sin6_port = 0;
2035                                 sin6->sin6_flowinfo = 0;
2036                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
2037                                        sizeof(struct in6_addr));
2038                                 sin6->sin6_scope_id = 0;
2039
2040                                 sin6++;
2041                                 sin6->sin6_family = AF_INET6;
2042                                 sin6->sin6_port = 0;
2043                                 sin6->sin6_flowinfo = 0;
2044                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
2045                                        sizeof(struct in6_addr));
2046                                 sin6->sin6_scope_id = 0;
2047                                 break;
2048 #endif
2049                         default:
2050                                 break;
2051                         }
2052                 }
2053         }
2054
2055         /* security context */
2056         if ((xfrm_ctx = xp->security)) {
2057                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2058
2059                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2060                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2061                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2062                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2063                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2064                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2065                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2066                        xfrm_ctx->ctx_len);
2067         }
2068
2069         hdr->sadb_msg_len = size / sizeof(uint64_t);
2070         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2071 }
2072
2073 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2074 {
2075         struct sk_buff *out_skb;
2076         struct sadb_msg *out_hdr;
2077         int err;
2078
2079         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2080         if (IS_ERR(out_skb)) {
2081                 err = PTR_ERR(out_skb);
2082                 goto out;
2083         }
2084         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2085
2086         out_hdr = (struct sadb_msg *) out_skb->data;
2087         out_hdr->sadb_msg_version = PF_KEY_V2;
2088
2089         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2090                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2091         else
2092                 out_hdr->sadb_msg_type = event2poltype(c->event);
2093         out_hdr->sadb_msg_errno = 0;
2094         out_hdr->sadb_msg_seq = c->seq;
2095         out_hdr->sadb_msg_pid = c->pid;
2096         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2097 out:
2098         return 0;
2099
2100 }
2101
2102 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2103 {
2104         int err = 0;
2105         struct sadb_lifetime *lifetime;
2106         struct sadb_address *sa;
2107         struct sadb_x_policy *pol;
2108         struct xfrm_policy *xp;
2109         struct km_event c;
2110         struct sadb_x_sec_ctx *sec_ctx;
2111
2112         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2113                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2114             !ext_hdrs[SADB_X_EXT_POLICY-1])
2115                 return -EINVAL;
2116
2117         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2118         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2119                 return -EINVAL;
2120         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2121                 return -EINVAL;
2122
2123         xp = xfrm_policy_alloc(GFP_KERNEL);
2124         if (xp == NULL)
2125                 return -ENOBUFS;
2126
2127         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2128                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2129         xp->priority = pol->sadb_x_policy_priority;
2130
2131         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2132         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2133         if (!xp->family) {
2134                 err = -EINVAL;
2135                 goto out;
2136         }
2137         xp->selector.family = xp->family;
2138         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2139         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2140         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2141         if (xp->selector.sport)
2142                 xp->selector.sport_mask = ~0;
2143
2144         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2145         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2146         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2147
2148         /* Amusing, we set this twice.  KAME apps appear to set same value
2149          * in both addresses.
2150          */
2151         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2152
2153         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2154         if (xp->selector.dport)
2155                 xp->selector.dport_mask = ~0;
2156
2157         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2158         if (sec_ctx != NULL) {
2159                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2160
2161                 if (!uctx) {
2162                         err = -ENOBUFS;
2163                         goto out;
2164                 }
2165
2166                 err = security_xfrm_policy_alloc(xp, uctx);
2167                 kfree(uctx);
2168
2169                 if (err)
2170                         goto out;
2171         }
2172
2173         xp->lft.soft_byte_limit = XFRM_INF;
2174         xp->lft.hard_byte_limit = XFRM_INF;
2175         xp->lft.soft_packet_limit = XFRM_INF;
2176         xp->lft.hard_packet_limit = XFRM_INF;
2177         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2178                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2179                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2180                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2181                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2182         }
2183         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2184                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2185                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2186                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2187                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2188         }
2189         xp->xfrm_nr = 0;
2190         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2191             (err = parse_ipsecrequests(xp, pol)) < 0)
2192                 goto out;
2193
2194         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2195                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2196
2197         if (err)
2198                 goto out;
2199
2200         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2201                 c.event = XFRM_MSG_UPDPOLICY;
2202         else
2203                 c.event = XFRM_MSG_NEWPOLICY;
2204
2205         c.seq = hdr->sadb_msg_seq;
2206         c.pid = hdr->sadb_msg_pid;
2207
2208         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2209         xfrm_pol_put(xp);
2210         return 0;
2211
2212 out:
2213         security_xfrm_policy_free(xp);
2214         kfree(xp);
2215         return err;
2216 }
2217
2218 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2219 {
2220         int err;
2221         struct sadb_address *sa;
2222         struct sadb_x_policy *pol;
2223         struct xfrm_policy *xp, tmp;
2224         struct xfrm_selector sel;
2225         struct km_event c;
2226         struct sadb_x_sec_ctx *sec_ctx;
2227
2228         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2229                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2230             !ext_hdrs[SADB_X_EXT_POLICY-1])
2231                 return -EINVAL;
2232
2233         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2234         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2235                 return -EINVAL;
2236
2237         memset(&sel, 0, sizeof(sel));
2238
2239         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2240         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2241         sel.prefixlen_s = sa->sadb_address_prefixlen;
2242         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2243         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2244         if (sel.sport)
2245                 sel.sport_mask = ~0;
2246
2247         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2248         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2249         sel.prefixlen_d = sa->sadb_address_prefixlen;
2250         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2251         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2252         if (sel.dport)
2253                 sel.dport_mask = ~0;
2254
2255         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2256         memset(&tmp, 0, sizeof(struct xfrm_policy));
2257
2258         if (sec_ctx != NULL) {
2259                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2260
2261                 if (!uctx)
2262                         return -ENOMEM;
2263
2264                 err = security_xfrm_policy_alloc(&tmp, uctx);
2265                 kfree(uctx);
2266
2267                 if (err)
2268                         return err;
2269         }
2270
2271         xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1);
2272         security_xfrm_policy_free(&tmp);
2273         if (xp == NULL)
2274                 return -ENOENT;
2275
2276         err = 0;
2277
2278         if ((err = security_xfrm_policy_delete(xp)))
2279                 goto out;
2280         c.seq = hdr->sadb_msg_seq;
2281         c.pid = hdr->sadb_msg_pid;
2282         c.event = XFRM_MSG_DELPOLICY;
2283         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2284
2285 out:
2286         xfrm_pol_put(xp);
2287         return err;
2288 }
2289
2290 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2291 {
2292         int err;
2293         struct sk_buff *out_skb;
2294         struct sadb_msg *out_hdr;
2295         err = 0;
2296
2297         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2298         if (IS_ERR(out_skb)) {
2299                 err =  PTR_ERR(out_skb);
2300                 goto out;
2301         }
2302         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2303
2304         out_hdr = (struct sadb_msg *) out_skb->data;
2305         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2306         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2307         out_hdr->sadb_msg_satype = 0;
2308         out_hdr->sadb_msg_errno = 0;
2309         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2310         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2311         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2312         err = 0;
2313
2314 out:
2315         return err;
2316 }
2317
2318 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2319 {
2320         unsigned int dir;
2321         int err;
2322         struct sadb_x_policy *pol;
2323         struct xfrm_policy *xp;
2324         struct km_event c;
2325
2326         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2327                 return -EINVAL;
2328
2329         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2330         if (dir >= XFRM_POLICY_MAX)
2331                 return -EINVAL;
2332
2333         xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id,
2334                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2335         if (xp == NULL)
2336                 return -ENOENT;
2337
2338         err = 0;
2339
2340         c.seq = hdr->sadb_msg_seq;
2341         c.pid = hdr->sadb_msg_pid;
2342         if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
2343                 c.data.byid = 1;
2344                 c.event = XFRM_MSG_DELPOLICY;
2345                 km_policy_notify(xp, dir, &c);
2346         } else {
2347                 err = key_pol_get_resp(sk, xp, hdr, dir);
2348         }
2349
2350         xfrm_pol_put(xp);
2351         return err;
2352 }
2353
2354 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2355 {
2356         struct pfkey_dump_data *data = ptr;
2357         struct sk_buff *out_skb;
2358         struct sadb_msg *out_hdr;
2359
2360         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2361         if (IS_ERR(out_skb))
2362                 return PTR_ERR(out_skb);
2363
2364         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2365
2366         out_hdr = (struct sadb_msg *) out_skb->data;
2367         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2368         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2369         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2370         out_hdr->sadb_msg_errno = 0;
2371         out_hdr->sadb_msg_seq = count;
2372         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2373         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2374         return 0;
2375 }
2376
2377 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2378 {
2379         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2380
2381         return xfrm_policy_walk(dump_sp, &data);
2382 }
2383
2384 static int key_notify_policy_flush(struct km_event *c)
2385 {
2386         struct sk_buff *skb_out;
2387         struct sadb_msg *hdr;
2388
2389         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2390         if (!skb_out)
2391                 return -ENOBUFS;
2392         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2393         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2394         hdr->sadb_msg_seq = c->seq;
2395         hdr->sadb_msg_pid = c->pid;
2396         hdr->sadb_msg_version = PF_KEY_V2;
2397         hdr->sadb_msg_errno = (uint8_t) 0;
2398         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2399         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2400         return 0;
2401
2402 }
2403
2404 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2405 {
2406         struct km_event c;
2407
2408         xfrm_policy_flush();
2409         c.event = XFRM_MSG_FLUSHPOLICY;
2410         c.pid = hdr->sadb_msg_pid;
2411         c.seq = hdr->sadb_msg_seq;
2412         km_policy_notify(NULL, 0, &c);
2413
2414         return 0;
2415 }
2416
2417 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2418                              struct sadb_msg *hdr, void **ext_hdrs);
2419 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2420         [SADB_RESERVED]         = pfkey_reserved,
2421         [SADB_GETSPI]           = pfkey_getspi,
2422         [SADB_UPDATE]           = pfkey_add,
2423         [SADB_ADD]              = pfkey_add,
2424         [SADB_DELETE]           = pfkey_delete,
2425         [SADB_GET]              = pfkey_get,
2426         [SADB_ACQUIRE]          = pfkey_acquire,
2427         [SADB_REGISTER]         = pfkey_register,
2428         [SADB_EXPIRE]           = NULL,
2429         [SADB_FLUSH]            = pfkey_flush,
2430         [SADB_DUMP]             = pfkey_dump,
2431         [SADB_X_PROMISC]        = pfkey_promisc,
2432         [SADB_X_PCHANGE]        = NULL,
2433         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2434         [SADB_X_SPDADD]         = pfkey_spdadd,
2435         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2436         [SADB_X_SPDGET]         = pfkey_spdget,
2437         [SADB_X_SPDACQUIRE]     = NULL,
2438         [SADB_X_SPDDUMP]        = pfkey_spddump,
2439         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2440         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2441         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2442 };
2443
2444 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2445 {
2446         void *ext_hdrs[SADB_EXT_MAX];
2447         int err;
2448
2449         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2450                         BROADCAST_PROMISC_ONLY, NULL);
2451
2452         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2453         err = parse_exthdrs(skb, hdr, ext_hdrs);
2454         if (!err) {
2455                 err = -EOPNOTSUPP;
2456                 if (pfkey_funcs[hdr->sadb_msg_type])
2457                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2458         }
2459         return err;
2460 }
2461
2462 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2463 {
2464         struct sadb_msg *hdr = NULL;
2465
2466         if (skb->len < sizeof(*hdr)) {
2467                 *errp = -EMSGSIZE;
2468         } else {
2469                 hdr = (struct sadb_msg *) skb->data;
2470                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2471                     hdr->sadb_msg_reserved != 0 ||
2472                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2473                      hdr->sadb_msg_type > SADB_MAX)) {
2474                         hdr = NULL;
2475                         *errp = -EINVAL;
2476                 } else if (hdr->sadb_msg_len != (skb->len /
2477                                                  sizeof(uint64_t)) ||
2478                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2479                                                 sizeof(uint64_t))) {
2480                         hdr = NULL;
2481                         *errp = -EMSGSIZE;
2482                 } else {
2483                         *errp = 0;
2484                 }
2485         }
2486         return hdr;
2487 }
2488
2489 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2490 {
2491         return t->aalgos & (1 << d->desc.sadb_alg_id);
2492 }
2493
2494 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2495 {
2496         return t->ealgos & (1 << d->desc.sadb_alg_id);
2497 }
2498
2499 static int count_ah_combs(struct xfrm_tmpl *t)
2500 {
2501         int i, sz = 0;
2502
2503         for (i = 0; ; i++) {
2504                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2505                 if (!aalg)
2506                         break;
2507                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2508                         sz += sizeof(struct sadb_comb);
2509         }
2510         return sz + sizeof(struct sadb_prop);
2511 }
2512
2513 static int count_esp_combs(struct xfrm_tmpl *t)
2514 {
2515         int i, k, sz = 0;
2516
2517         for (i = 0; ; i++) {
2518                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2519                 if (!ealg)
2520                         break;
2521
2522                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2523                         continue;
2524
2525                 for (k = 1; ; k++) {
2526                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2527                         if (!aalg)
2528                                 break;
2529
2530                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2531                                 sz += sizeof(struct sadb_comb);
2532                 }
2533         }
2534         return sz + sizeof(struct sadb_prop);
2535 }
2536
2537 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2538 {
2539         struct sadb_prop *p;
2540         int i;
2541
2542         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2543         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2544         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2545         p->sadb_prop_replay = 32;
2546         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2547
2548         for (i = 0; ; i++) {
2549                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2550                 if (!aalg)
2551                         break;
2552
2553                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2554                         struct sadb_comb *c;
2555                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2556                         memset(c, 0, sizeof(*c));
2557                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2558                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2559                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2560                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2561                         c->sadb_comb_hard_addtime = 24*60*60;
2562                         c->sadb_comb_soft_addtime = 20*60*60;
2563                         c->sadb_comb_hard_usetime = 8*60*60;
2564                         c->sadb_comb_soft_usetime = 7*60*60;
2565                 }
2566         }
2567 }
2568
2569 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2570 {
2571         struct sadb_prop *p;
2572         int i, k;
2573
2574         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2575         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2576         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2577         p->sadb_prop_replay = 32;
2578         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2579
2580         for (i=0; ; i++) {
2581                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2582                 if (!ealg)
2583                         break;
2584
2585                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2586                         continue;
2587
2588                 for (k = 1; ; k++) {
2589                         struct sadb_comb *c;
2590                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2591                         if (!aalg)
2592                                 break;
2593                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2594                                 continue;
2595                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2596                         memset(c, 0, sizeof(*c));
2597                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2598                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2599                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2600                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2601                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2602                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2603                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2604                         c->sadb_comb_hard_addtime = 24*60*60;
2605                         c->sadb_comb_soft_addtime = 20*60*60;
2606                         c->sadb_comb_hard_usetime = 8*60*60;
2607                         c->sadb_comb_soft_usetime = 7*60*60;
2608                 }
2609         }
2610 }
2611
2612 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2613 {
2614         return 0;
2615 }
2616
2617 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2618 {
2619         struct sk_buff *out_skb;
2620         struct sadb_msg *out_hdr;
2621         int hard;
2622         int hsc;
2623
2624         hard = c->data.hard;
2625         if (hard)
2626                 hsc = 2;
2627         else
2628                 hsc = 1;
2629
2630         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2631         if (IS_ERR(out_skb))
2632                 return PTR_ERR(out_skb);
2633
2634         out_hdr = (struct sadb_msg *) out_skb->data;
2635         out_hdr->sadb_msg_version = PF_KEY_V2;
2636         out_hdr->sadb_msg_type = SADB_EXPIRE;
2637         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2638         out_hdr->sadb_msg_errno = 0;
2639         out_hdr->sadb_msg_reserved = 0;
2640         out_hdr->sadb_msg_seq = 0;
2641         out_hdr->sadb_msg_pid = 0;
2642
2643         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2644         return 0;
2645 }
2646
2647 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2648 {
2649         switch (c->event) {
2650         case XFRM_MSG_EXPIRE:
2651                 return key_notify_sa_expire(x, c);
2652         case XFRM_MSG_DELSA:
2653         case XFRM_MSG_NEWSA:
2654         case XFRM_MSG_UPDSA:
2655                 return key_notify_sa(x, c);
2656         case XFRM_MSG_FLUSHSA:
2657                 return key_notify_sa_flush(c);
2658         case XFRM_MSG_NEWAE: /* not yet supported */
2659                 break;
2660         default:
2661                 printk("pfkey: Unknown SA event %d\n", c->event);
2662                 break;
2663         }
2664
2665         return 0;
2666 }
2667
2668 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2669 {
2670         switch (c->event) {
2671         case XFRM_MSG_POLEXPIRE:
2672                 return key_notify_policy_expire(xp, c);
2673         case XFRM_MSG_DELPOLICY:
2674         case XFRM_MSG_NEWPOLICY:
2675         case XFRM_MSG_UPDPOLICY:
2676                 return key_notify_policy(xp, dir, c);
2677         case XFRM_MSG_FLUSHPOLICY:
2678                 return key_notify_policy_flush(c);
2679         default:
2680                 printk("pfkey: Unknown policy event %d\n", c->event);
2681                 break;
2682         }
2683
2684         return 0;
2685 }
2686
2687 static u32 get_acqseq(void)
2688 {
2689         u32 res;
2690         static u32 acqseq;
2691         static DEFINE_SPINLOCK(acqseq_lock);
2692
2693         spin_lock_bh(&acqseq_lock);
2694         res = (++acqseq ? : ++acqseq);
2695         spin_unlock_bh(&acqseq_lock);
2696         return res;
2697 }
2698
2699 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2700 {
2701         struct sk_buff *skb;
2702         struct sadb_msg *hdr;
2703         struct sadb_address *addr;
2704         struct sadb_x_policy *pol;
2705         struct sockaddr_in *sin;
2706 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2707         struct sockaddr_in6 *sin6;
2708 #endif
2709         int sockaddr_size;
2710         int size;
2711
2712         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2713         if (!sockaddr_size)
2714                 return -EINVAL;
2715
2716         size = sizeof(struct sadb_msg) +
2717                 (sizeof(struct sadb_address) * 2) +
2718                 (sockaddr_size * 2) +
2719                 sizeof(struct sadb_x_policy);
2720
2721         if (x->id.proto == IPPROTO_AH)
2722                 size += count_ah_combs(t);
2723         else if (x->id.proto == IPPROTO_ESP)
2724                 size += count_esp_combs(t);
2725
2726         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2727         if (skb == NULL)
2728                 return -ENOMEM;
2729
2730         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2731         hdr->sadb_msg_version = PF_KEY_V2;
2732         hdr->sadb_msg_type = SADB_ACQUIRE;
2733         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2734         hdr->sadb_msg_len = size / sizeof(uint64_t);
2735         hdr->sadb_msg_errno = 0;
2736         hdr->sadb_msg_reserved = 0;
2737         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2738         hdr->sadb_msg_pid = 0;
2739
2740         /* src address */
2741         addr = (struct sadb_address*) skb_put(skb,
2742                                               sizeof(struct sadb_address)+sockaddr_size);
2743         addr->sadb_address_len =
2744                 (sizeof(struct sadb_address)+sockaddr_size)/
2745                         sizeof(uint64_t);
2746         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2747         addr->sadb_address_proto = 0;
2748         addr->sadb_address_reserved = 0;
2749         if (x->props.family == AF_INET) {
2750                 addr->sadb_address_prefixlen = 32;
2751
2752                 sin = (struct sockaddr_in *) (addr + 1);
2753                 sin->sin_family = AF_INET;
2754                 sin->sin_addr.s_addr = x->props.saddr.a4;
2755                 sin->sin_port = 0;
2756                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2757         }
2758 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2759         else if (x->props.family == AF_INET6) {
2760                 addr->sadb_address_prefixlen = 128;
2761
2762                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2763                 sin6->sin6_family = AF_INET6;
2764                 sin6->sin6_port = 0;
2765                 sin6->sin6_flowinfo = 0;
2766                 memcpy(&sin6->sin6_addr,
2767                        x->props.saddr.a6, sizeof(struct in6_addr));
2768                 sin6->sin6_scope_id = 0;
2769         }
2770 #endif
2771         else
2772                 BUG();
2773
2774         /* dst address */
2775         addr = (struct sadb_address*) skb_put(skb,
2776                                               sizeof(struct sadb_address)+sockaddr_size);
2777         addr->sadb_address_len =
2778                 (sizeof(struct sadb_address)+sockaddr_size)/
2779                         sizeof(uint64_t);
2780         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2781         addr->sadb_address_proto = 0;
2782         addr->sadb_address_reserved = 0;
2783         if (x->props.family == AF_INET) {
2784                 addr->sadb_address_prefixlen = 32;
2785
2786                 sin = (struct sockaddr_in *) (addr + 1);
2787                 sin->sin_family = AF_INET;
2788                 sin->sin_addr.s_addr = x->id.daddr.a4;
2789                 sin->sin_port = 0;
2790                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2791         }
2792 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2793         else if (x->props.family == AF_INET6) {
2794                 addr->sadb_address_prefixlen = 128;
2795
2796                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2797                 sin6->sin6_family = AF_INET6;
2798                 sin6->sin6_port = 0;
2799                 sin6->sin6_flowinfo = 0;
2800                 memcpy(&sin6->sin6_addr,
2801                        x->id.daddr.a6, sizeof(struct in6_addr));
2802                 sin6->sin6_scope_id = 0;
2803         }
2804 #endif
2805         else
2806                 BUG();
2807
2808         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2809         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2810         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2811         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2812         pol->sadb_x_policy_dir = dir+1;
2813         pol->sadb_x_policy_id = xp->index;
2814
2815         /* Set sadb_comb's. */
2816         if (x->id.proto == IPPROTO_AH)
2817                 dump_ah_combs(skb, t);
2818         else if (x->id.proto == IPPROTO_ESP)
2819                 dump_esp_combs(skb, t);
2820
2821         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2822 }
2823
2824 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2825                                                 u8 *data, int len, int *dir)
2826 {
2827         struct xfrm_policy *xp;
2828         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2829         struct sadb_x_sec_ctx *sec_ctx;
2830
2831         switch (family) {
2832         case AF_INET:
2833                 if (opt != IP_IPSEC_POLICY) {
2834                         *dir = -EOPNOTSUPP;
2835                         return NULL;
2836                 }
2837                 break;
2838 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2839         case AF_INET6:
2840                 if (opt != IPV6_IPSEC_POLICY) {
2841                         *dir = -EOPNOTSUPP;
2842                         return NULL;
2843                 }
2844                 break;
2845 #endif
2846         default:
2847                 *dir = -EINVAL;
2848                 return NULL;
2849         }
2850
2851         *dir = -EINVAL;
2852
2853         if (len < sizeof(struct sadb_x_policy) ||
2854             pol->sadb_x_policy_len*8 > len ||
2855             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2856             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2857                 return NULL;
2858
2859         xp = xfrm_policy_alloc(GFP_ATOMIC);
2860         if (xp == NULL) {
2861                 *dir = -ENOBUFS;
2862                 return NULL;
2863         }
2864
2865         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2866                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2867
2868         xp->lft.soft_byte_limit = XFRM_INF;
2869         xp->lft.hard_byte_limit = XFRM_INF;
2870         xp->lft.soft_packet_limit = XFRM_INF;
2871         xp->lft.hard_packet_limit = XFRM_INF;
2872         xp->family = family;
2873
2874         xp->xfrm_nr = 0;
2875         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2876             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2877                 goto out;
2878
2879         /* security context too */
2880         if (len >= (pol->sadb_x_policy_len*8 +
2881             sizeof(struct sadb_x_sec_ctx))) {
2882                 char *p = (char *)pol;
2883                 struct xfrm_user_sec_ctx *uctx;
2884
2885                 p += pol->sadb_x_policy_len*8;
2886                 sec_ctx = (struct sadb_x_sec_ctx *)p;
2887                 if (len < pol->sadb_x_policy_len*8 +
2888                     sec_ctx->sadb_x_sec_len)
2889                         goto out;
2890                 if ((*dir = verify_sec_ctx_len(p)))
2891                         goto out;
2892                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2893                 *dir = security_xfrm_policy_alloc(xp, uctx);
2894                 kfree(uctx);
2895
2896                 if (*dir)
2897                         goto out;
2898         }
2899
2900         *dir = pol->sadb_x_policy_dir-1;
2901         return xp;
2902
2903 out:
2904         security_xfrm_policy_free(xp);
2905         kfree(xp);
2906         return NULL;
2907 }
2908
2909 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2910 {
2911         struct sk_buff *skb;
2912         struct sadb_msg *hdr;
2913         struct sadb_sa *sa;
2914         struct sadb_address *addr;
2915         struct sadb_x_nat_t_port *n_port;
2916         struct sockaddr_in *sin;
2917 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2918         struct sockaddr_in6 *sin6;
2919 #endif
2920         int sockaddr_size;
2921         int size;
2922         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2923         struct xfrm_encap_tmpl *natt = NULL;
2924
2925         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2926         if (!sockaddr_size)
2927                 return -EINVAL;
2928
2929         if (!satype)
2930                 return -EINVAL;
2931
2932         if (!x->encap)
2933                 return -EINVAL;
2934
2935         natt = x->encap;
2936
2937         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2938          *
2939          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2940          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2941          */
2942
2943         size = sizeof(struct sadb_msg) +
2944                 sizeof(struct sadb_sa) +
2945                 (sizeof(struct sadb_address) * 2) +
2946                 (sockaddr_size * 2) +
2947                 (sizeof(struct sadb_x_nat_t_port) * 2);
2948
2949         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2950         if (skb == NULL)
2951                 return -ENOMEM;
2952
2953         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2954         hdr->sadb_msg_version = PF_KEY_V2;
2955         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2956         hdr->sadb_msg_satype = satype;
2957         hdr->sadb_msg_len = size / sizeof(uint64_t);
2958         hdr->sadb_msg_errno = 0;
2959         hdr->sadb_msg_reserved = 0;
2960         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2961         hdr->sadb_msg_pid = 0;
2962
2963         /* SA */
2964         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2965         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2966         sa->sadb_sa_exttype = SADB_EXT_SA;
2967         sa->sadb_sa_spi = x->id.spi;
2968         sa->sadb_sa_replay = 0;
2969         sa->sadb_sa_state = 0;
2970         sa->sadb_sa_auth = 0;
2971         sa->sadb_sa_encrypt = 0;
2972         sa->sadb_sa_flags = 0;
2973
2974         /* ADDRESS_SRC (old addr) */
2975         addr = (struct sadb_address*)
2976                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2977         addr->sadb_address_len =
2978                 (sizeof(struct sadb_address)+sockaddr_size)/
2979                         sizeof(uint64_t);
2980         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2981         addr->sadb_address_proto = 0;
2982         addr->sadb_address_reserved = 0;
2983         if (x->props.family == AF_INET) {
2984                 addr->sadb_address_prefixlen = 32;
2985
2986                 sin = (struct sockaddr_in *) (addr + 1);
2987                 sin->sin_family = AF_INET;
2988                 sin->sin_addr.s_addr = x->props.saddr.a4;
2989                 sin->sin_port = 0;
2990                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2991         }
2992 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2993         else if (x->props.family == AF_INET6) {
2994                 addr->sadb_address_prefixlen = 128;
2995
2996                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2997                 sin6->sin6_family = AF_INET6;
2998                 sin6->sin6_port = 0;
2999                 sin6->sin6_flowinfo = 0;
3000                 memcpy(&sin6->sin6_addr,
3001                        x->props.saddr.a6, sizeof(struct in6_addr));
3002                 sin6->sin6_scope_id = 0;
3003         }
3004 #endif
3005         else
3006                 BUG();
3007
3008         /* NAT_T_SPORT (old port) */
3009         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3010         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3011         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3012         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3013         n_port->sadb_x_nat_t_port_reserved = 0;
3014
3015         /* ADDRESS_DST (new addr) */
3016         addr = (struct sadb_address*)
3017                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3018         addr->sadb_address_len =
3019                 (sizeof(struct sadb_address)+sockaddr_size)/
3020                         sizeof(uint64_t);
3021         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3022         addr->sadb_address_proto = 0;
3023         addr->sadb_address_reserved = 0;
3024         if (x->props.family == AF_INET) {
3025                 addr->sadb_address_prefixlen = 32;
3026
3027                 sin = (struct sockaddr_in *) (addr + 1);
3028                 sin->sin_family = AF_INET;
3029                 sin->sin_addr.s_addr = ipaddr->a4;
3030                 sin->sin_port = 0;
3031                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3032         }
3033 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3034         else if (x->props.family == AF_INET6) {
3035                 addr->sadb_address_prefixlen = 128;
3036
3037                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3038                 sin6->sin6_family = AF_INET6;
3039                 sin6->sin6_port = 0;
3040                 sin6->sin6_flowinfo = 0;
3041                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
3042                 sin6->sin6_scope_id = 0;
3043         }
3044 #endif
3045         else
3046                 BUG();
3047
3048         /* NAT_T_DPORT (new port) */
3049         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3050         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3051         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3052         n_port->sadb_x_nat_t_port_port = sport;
3053         n_port->sadb_x_nat_t_port_reserved = 0;
3054
3055         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3056 }
3057
3058 static int pfkey_sendmsg(struct kiocb *kiocb,
3059                          struct socket *sock, struct msghdr *msg, size_t len)
3060 {
3061         struct sock *sk = sock->sk;
3062         struct sk_buff *skb = NULL;
3063         struct sadb_msg *hdr = NULL;
3064         int err;
3065
3066         err = -EOPNOTSUPP;
3067         if (msg->msg_flags & MSG_OOB)
3068                 goto out;
3069
3070         err = -EMSGSIZE;
3071         if ((unsigned)len > sk->sk_sndbuf - 32)
3072                 goto out;
3073
3074         err = -ENOBUFS;
3075         skb = alloc_skb(len, GFP_KERNEL);
3076         if (skb == NULL)
3077                 goto out;
3078
3079         err = -EFAULT;
3080         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3081                 goto out;
3082
3083         hdr = pfkey_get_base_msg(skb, &err);
3084         if (!hdr)
3085                 goto out;
3086
3087         mutex_lock(&xfrm_cfg_mutex);
3088         err = pfkey_process(sk, skb, hdr);
3089         mutex_unlock(&xfrm_cfg_mutex);
3090
3091 out:
3092         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3093                 err = 0;
3094         if (skb)
3095                 kfree_skb(skb);
3096
3097         return err ? : len;
3098 }
3099
3100 static int pfkey_recvmsg(struct kiocb *kiocb,
3101                          struct socket *sock, struct msghdr *msg, size_t len,
3102                          int flags)
3103 {
3104         struct sock *sk = sock->sk;
3105         struct sk_buff *skb;
3106         int copied, err;
3107
3108         err = -EINVAL;
3109         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3110                 goto out;
3111
3112         msg->msg_namelen = 0;
3113         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3114         if (skb == NULL)
3115                 goto out;
3116
3117         copied = skb->len;
3118         if (copied > len) {
3119                 msg->msg_flags |= MSG_TRUNC;
3120                 copied = len;
3121         }
3122
3123         skb->h.raw = skb->data;
3124         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3125         if (err)
3126                 goto out_free;
3127
3128         sock_recv_timestamp(msg, sk, skb);
3129
3130         err = (flags & MSG_TRUNC) ? skb->len : copied;
3131
3132 out_free:
3133         skb_free_datagram(sk, skb);
3134 out:
3135         return err;
3136 }
3137
3138 static const struct proto_ops pfkey_ops = {
3139         .family         =       PF_KEY,
3140         .owner          =       THIS_MODULE,
3141         /* Operations that make no sense on pfkey sockets. */
3142         .bind           =       sock_no_bind,
3143         .connect        =       sock_no_connect,
3144         .socketpair     =       sock_no_socketpair,
3145         .accept         =       sock_no_accept,
3146         .getname        =       sock_no_getname,
3147         .ioctl          =       sock_no_ioctl,
3148         .listen         =       sock_no_listen,
3149         .shutdown       =       sock_no_shutdown,
3150         .setsockopt     =       sock_no_setsockopt,
3151         .getsockopt     =       sock_no_getsockopt,
3152         .mmap           =       sock_no_mmap,
3153         .sendpage       =       sock_no_sendpage,
3154
3155         /* Now the operations that really occur. */
3156         .release        =       pfkey_release,
3157         .poll           =       datagram_poll,
3158         .sendmsg        =       pfkey_sendmsg,
3159         .recvmsg        =       pfkey_recvmsg,
3160 };
3161
3162 static struct net_proto_family pfkey_family_ops = {
3163         .family =       PF_KEY,
3164         .create =       pfkey_create,
3165         .owner  =       THIS_MODULE,
3166 };
3167
3168 #ifdef CONFIG_PROC_FS
3169 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
3170                            int length, int *eof, void *data)
3171 {
3172         off_t pos = 0;
3173         off_t begin = 0;
3174         int len = 0;
3175         struct sock *s;
3176         struct hlist_node *node;
3177
3178         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3179
3180         read_lock(&pfkey_table_lock);
3181
3182         sk_for_each(s, node, &pfkey_table) {
3183                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
3184                                s,
3185                                atomic_read(&s->sk_refcnt),
3186                                atomic_read(&s->sk_rmem_alloc),
3187                                atomic_read(&s->sk_wmem_alloc),
3188                                sock_i_uid(s),
3189                                sock_i_ino(s)
3190                                );
3191
3192                 buffer[len++] = '\n';
3193
3194                 pos = begin + len;
3195                 if (pos < offset) {
3196                         len = 0;
3197                         begin = pos;
3198                 }
3199                 if(pos > offset + length)
3200                         goto done;
3201         }
3202         *eof = 1;
3203
3204 done:
3205         read_unlock(&pfkey_table_lock);
3206
3207         *start = buffer + (offset - begin);
3208         len -= (offset - begin);
3209
3210         if (len > length)
3211                 len = length;
3212         if (len < 0)
3213                 len = 0;
3214
3215         return len;
3216 }
3217 #endif
3218
3219 static struct xfrm_mgr pfkeyv2_mgr =
3220 {
3221         .id             = "pfkeyv2",
3222         .notify         = pfkey_send_notify,
3223         .acquire        = pfkey_send_acquire,
3224         .compile_policy = pfkey_compile_policy,
3225         .new_mapping    = pfkey_send_new_mapping,
3226         .notify_policy  = pfkey_send_policy_notify,
3227 };
3228
3229 static void __exit ipsec_pfkey_exit(void)
3230 {
3231         xfrm_unregister_km(&pfkeyv2_mgr);
3232         remove_proc_entry("net/pfkey", NULL);
3233         sock_unregister(PF_KEY);
3234         proto_unregister(&key_proto);
3235 }
3236
3237 static int __init ipsec_pfkey_init(void)
3238 {
3239         int err = proto_register(&key_proto, 0);
3240
3241         if (err != 0)
3242                 goto out;
3243
3244         err = sock_register(&pfkey_family_ops);
3245         if (err != 0)
3246                 goto out_unregister_key_proto;
3247 #ifdef CONFIG_PROC_FS
3248         err = -ENOMEM;
3249         if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3250                 goto out_sock_unregister;
3251 #endif
3252         err = xfrm_register_km(&pfkeyv2_mgr);
3253         if (err != 0)
3254                 goto out_remove_proc_entry;
3255 out:
3256         return err;
3257 out_remove_proc_entry:
3258 #ifdef CONFIG_PROC_FS
3259         remove_proc_entry("net/pfkey", NULL);
3260 out_sock_unregister:
3261 #endif
3262         sock_unregister(PF_KEY);
3263 out_unregister_key_proto:
3264         proto_unregister(&key_proto);
3265         goto out;
3266 }
3267
3268 module_init(ipsec_pfkey_init);
3269 module_exit(ipsec_pfkey_exit);
3270 MODULE_LICENSE("GPL");
3271 MODULE_ALIAS_NETPROTO(PF_KEY);