git.oblomov.eu Git - linux-2.6/blob - net/key/af_key.c

   1 /*
   2  * net/key/af_key.c     An implementation of PF_KEYv2 sockets.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Maxim Giryaev   <gem@asplinux.ru>
  10  *              David S. Miller <davem@redhat.com>
  11  *              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
  12  *              Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  13  *              Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org>
  14  *              Derek Atkins <derek@ihtfp.com>
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/capability.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/socket.h>
  22 #include <linux/pfkeyv2.h>
  23 #include <linux/ipsec.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/rtnetlink.h>
  26 #include <linux/in.h>
  27 #include <linux/in6.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/init.h>
  30 #include <net/xfrm.h>
  31
  32 #include <net/sock.h>
  33
  34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x))
  35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x))
  36
  37
  38 /* List of all pfkey sockets. */
  39 static HLIST_HEAD(pfkey_table);
  40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait);
  41 static DEFINE_RWLOCK(pfkey_table_lock);
  42 static atomic_t pfkey_table_users = ATOMIC_INIT(0);
  43
  44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0);
  45
  46 struct pfkey_sock {
  47         /* struct sock must be the first member of struct pfkey_sock */
  48         struct sock     sk;
  49         int             registered;
  50         int             promisc;
  51 };
  52
  53 static inline struct pfkey_sock *pfkey_sk(struct sock *sk)
  54 {
  55         return (struct pfkey_sock *)sk;
  56 }
  57
  58 static void pfkey_sock_destruct(struct sock *sk)
  59 {
  60         skb_queue_purge(&sk->sk_receive_queue);
  61
  62         if (!sock_flag(sk, SOCK_DEAD)) {
  63                 printk("Attempt to release alive pfkey socket: %p\n", sk);
  64                 return;
  65         }
  66
  67         BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
  68         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
  69
  70         atomic_dec(&pfkey_socks_nr);
  71 }
  72
  73 static void pfkey_table_grab(void)
  74 {
  75         write_lock_bh(&pfkey_table_lock);
  76
  77         if (atomic_read(&pfkey_table_users)) {
  78                 DECLARE_WAITQUEUE(wait, current);
  79
  80                 add_wait_queue_exclusive(&pfkey_table_wait, &wait);
  81                 for(;;) {
  82                         set_current_state(TASK_UNINTERRUPTIBLE);
  83                         if (atomic_read(&pfkey_table_users) == 0)
  84                                 break;
  85                         write_unlock_bh(&pfkey_table_lock);
  86                         schedule();
  87                         write_lock_bh(&pfkey_table_lock);
  88                 }
  89
  90                 __set_current_state(TASK_RUNNING);
  91                 remove_wait_queue(&pfkey_table_wait, &wait);
  92         }
  93 }
  94
  95 static __inline__ void pfkey_table_ungrab(void)
  96 {
  97         write_unlock_bh(&pfkey_table_lock);
  98         wake_up(&pfkey_table_wait);
  99 }
 100
 101 static __inline__ void pfkey_lock_table(void)
 102 {
 103         /* read_lock() synchronizes us to pfkey_table_grab */
 104
 105         read_lock(&pfkey_table_lock);
 106         atomic_inc(&pfkey_table_users);
 107         read_unlock(&pfkey_table_lock);
 108 }
 109
 110 static __inline__ void pfkey_unlock_table(void)
 111 {
 112         if (atomic_dec_and_test(&pfkey_table_users))
 113                 wake_up(&pfkey_table_wait);
 114 }
 115
 116
 117 static const struct proto_ops pfkey_ops;
 118
 119 static void pfkey_insert(struct sock *sk)
 120 {
 121         pfkey_table_grab();
 122         sk_add_node(sk, &pfkey_table);
 123         pfkey_table_ungrab();
 124 }
 125
 126 static void pfkey_remove(struct sock *sk)
 127 {
 128         pfkey_table_grab();
 129         sk_del_node_init(sk);
 130         pfkey_table_ungrab();
 131 }
 132
 133 static struct proto key_proto = {
 134         .name     = "KEY",
 135         .owner    = THIS_MODULE,
 136         .obj_size = sizeof(struct pfkey_sock),
 137 };
 138
 139 static int pfkey_create(struct socket *sock, int protocol)
 140 {
 141         struct sock *sk;
 142         int err;
 143
 144         if (!capable(CAP_NET_ADMIN))
 145                 return -EPERM;
 146         if (sock->type != SOCK_RAW)
 147                 return -ESOCKTNOSUPPORT;
 148         if (protocol != PF_KEY_V2)
 149                 return -EPROTONOSUPPORT;
 150
 151         err = -ENOMEM;
 152         sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1);
 153         if (sk == NULL)
 154                 goto out;
 155
 156         sock->ops = &pfkey_ops;
 157         sock_init_data(sock, sk);
 158
 159         sk->sk_family = PF_KEY;
 160         sk->sk_destruct = pfkey_sock_destruct;
 161
 162         atomic_inc(&pfkey_socks_nr);
 163
 164         pfkey_insert(sk);
 165
 166         return 0;
 167 out:
 168         return err;
 169 }
 170
 171 static int pfkey_release(struct socket *sock)
 172 {
 173         struct sock *sk = sock->sk;
 174
 175         if (!sk)
 176                 return 0;
 177
 178         pfkey_remove(sk);
 179
 180         sock_orphan(sk);
 181         sock->sk = NULL;
 182         skb_queue_purge(&sk->sk_write_queue);
 183         sock_put(sk);
 184
 185         return 0;
 186 }
 187
 188 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2,
 189                                gfp_t allocation, struct sock *sk)
 190 {
 191         int err = -ENOBUFS;
 192
 193         sock_hold(sk);
 194         if (*skb2 == NULL) {
 195                 if (atomic_read(&skb->users) != 1) {
 196                         *skb2 = skb_clone(skb, allocation);
 197                 } else {
 198                         *skb2 = skb;
 199                         atomic_inc(&skb->users);
 200                 }
 201         }
 202         if (*skb2 != NULL) {
 203                 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) {
 204                         skb_orphan(*skb2);
 205                         skb_set_owner_r(*skb2, sk);
 206                         skb_queue_tail(&sk->sk_receive_queue, *skb2);
 207                         sk->sk_data_ready(sk, (*skb2)->len);
 208                         *skb2 = NULL;
 209                         err = 0;
 210                 }
 211         }
 212         sock_put(sk);
 213         return err;
 214 }
 215
 216 /* Send SKB to all pfkey sockets matching selected criteria.  */
 217 #define BROADCAST_ALL           0
 218 #define BROADCAST_ONE           1
 219 #define BROADCAST_REGISTERED    2
 220 #define BROADCAST_PROMISC_ONLY  4
 221 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation,
 222                            int broadcast_flags, struct sock *one_sk)
 223 {
 224         struct sock *sk;
 225         struct hlist_node *node;
 226         struct sk_buff *skb2 = NULL;
 227         int err = -ESRCH;
 228
 229         /* XXX Do we need something like netlink_overrun?  I think
 230          * XXX PF_KEY socket apps will not mind current behavior.
 231          */
 232         if (!skb)
 233                 return -ENOMEM;
 234
 235         pfkey_lock_table();
 236         sk_for_each(sk, node, &pfkey_table) {
 237                 struct pfkey_sock *pfk = pfkey_sk(sk);
 238                 int err2;
 239
 240                 /* Yes, it means that if you are meant to receive this
 241                  * pfkey message you receive it twice as promiscuous
 242                  * socket.
 243                  */
 244                 if (pfk->promisc)
 245                         pfkey_broadcast_one(skb, &skb2, allocation, sk);
 246
 247                 /* the exact target will be processed later */
 248                 if (sk == one_sk)
 249                         continue;
 250                 if (broadcast_flags != BROADCAST_ALL) {
 251                         if (broadcast_flags & BROADCAST_PROMISC_ONLY)
 252                                 continue;
 253                         if ((broadcast_flags & BROADCAST_REGISTERED) &&
 254                             !pfk->registered)
 255                                 continue;
 256                         if (broadcast_flags & BROADCAST_ONE)
 257                                 continue;
 258                 }
 259
 260                 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk);
 261
 262                 /* Error is cleare after succecful sending to at least one
 263                  * registered KM */
 264                 if ((broadcast_flags & BROADCAST_REGISTERED) && err)
 265                         err = err2;
 266         }
 267         pfkey_unlock_table();
 268
 269         if (one_sk != NULL)
 270                 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk);
 271
 272         if (skb2)
 273                 kfree_skb(skb2);
 274         kfree_skb(skb);
 275         return err;
 276 }
 277
 278 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig)
 279 {
 280         *new = *orig;
 281 }
 282
 283 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk)
 284 {
 285         struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
 286         struct sadb_msg *hdr;
 287
 288         if (!skb)
 289                 return -ENOBUFS;
 290
 291         /* Woe be to the platform trying to support PFKEY yet
 292          * having normal errnos outside the 1-255 range, inclusive.
 293          */
 294         err = -err;
 295         if (err == ERESTARTSYS ||
 296             err == ERESTARTNOHAND ||
 297             err == ERESTARTNOINTR)
 298                 err = EINTR;
 299         if (err >= 512)
 300                 err = EINVAL;
 301         BUG_ON(err <= 0 || err >= 256);
 302
 303         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 304         pfkey_hdr_dup(hdr, orig);
 305         hdr->sadb_msg_errno = (uint8_t) err;
 306         hdr->sadb_msg_len = (sizeof(struct sadb_msg) /
 307                              sizeof(uint64_t));
 308
 309         pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk);
 310
 311         return 0;
 312 }
 313
 314 static u8 sadb_ext_min_len[] = {
 315         [SADB_EXT_RESERVED]             = (u8) 0,
 316         [SADB_EXT_SA]                   = (u8) sizeof(struct sadb_sa),
 317         [SADB_EXT_LIFETIME_CURRENT]     = (u8) sizeof(struct sadb_lifetime),
 318         [SADB_EXT_LIFETIME_HARD]        = (u8) sizeof(struct sadb_lifetime),
 319         [SADB_EXT_LIFETIME_SOFT]        = (u8) sizeof(struct sadb_lifetime),
 320         [SADB_EXT_ADDRESS_SRC]          = (u8) sizeof(struct sadb_address),
 321         [SADB_EXT_ADDRESS_DST]          = (u8) sizeof(struct sadb_address),
 322         [SADB_EXT_ADDRESS_PROXY]        = (u8) sizeof(struct sadb_address),
 323         [SADB_EXT_KEY_AUTH]             = (u8) sizeof(struct sadb_key),
 324         [SADB_EXT_KEY_ENCRYPT]          = (u8) sizeof(struct sadb_key),
 325         [SADB_EXT_IDENTITY_SRC]         = (u8) sizeof(struct sadb_ident),
 326         [SADB_EXT_IDENTITY_DST]         = (u8) sizeof(struct sadb_ident),
 327         [SADB_EXT_SENSITIVITY]          = (u8) sizeof(struct sadb_sens),
 328         [SADB_EXT_PROPOSAL]             = (u8) sizeof(struct sadb_prop),
 329         [SADB_EXT_SUPPORTED_AUTH]       = (u8) sizeof(struct sadb_supported),
 330         [SADB_EXT_SUPPORTED_ENCRYPT]    = (u8) sizeof(struct sadb_supported),
 331         [SADB_EXT_SPIRANGE]             = (u8) sizeof(struct sadb_spirange),
 332         [SADB_X_EXT_KMPRIVATE]          = (u8) sizeof(struct sadb_x_kmprivate),
 333         [SADB_X_EXT_POLICY]             = (u8) sizeof(struct sadb_x_policy),
 334         [SADB_X_EXT_SA2]                = (u8) sizeof(struct sadb_x_sa2),
 335         [SADB_X_EXT_NAT_T_TYPE]         = (u8) sizeof(struct sadb_x_nat_t_type),
 336         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 337         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
 338         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
 339         [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 340 };
 341
 342 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
 343 static int verify_address_len(void *p)
 344 {
 345         struct sadb_address *sp = p;
 346         struct sockaddr *addr = (struct sockaddr *)(sp + 1);
 347         struct sockaddr_in *sin;
 348 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 349         struct sockaddr_in6 *sin6;
 350 #endif
 351         int len;
 352
 353         switch (addr->sa_family) {
 354         case AF_INET:
 355                 len  = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1);
 356                 len /= sizeof(uint64_t);
 357                 if (sp->sadb_address_len != len ||
 358                     sp->sadb_address_prefixlen > 32)
 359                         return -EINVAL;
 360                 break;
 361 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 362         case AF_INET6:
 363                 len  = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1);
 364                 len /= sizeof(uint64_t);
 365                 if (sp->sadb_address_len != len ||
 366                     sp->sadb_address_prefixlen > 128)
 367                         return -EINVAL;
 368                 break;
 369 #endif
 370         default:
 371                 /* It is user using kernel to keep track of security
 372                  * associations for another protocol, such as
 373                  * OSPF/RSVP/RIPV2/MIP.  It is user's job to verify
 374                  * lengths.
 375                  *
 376                  * XXX Actually, association/policy database is not yet
 377                  * XXX able to cope with arbitrary sockaddr families.
 378                  * XXX When it can, remove this -EINVAL.  -DaveM
 379                  */
 380                 return -EINVAL;
 381                 break;
 382         };
 383
 384         return 0;
 385 }
 386
 387 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
 388 {
 389         int len = 0;
 390
 391         len += sizeof(struct sadb_x_sec_ctx);
 392         len += sec_ctx->sadb_x_ctx_len;
 393         len += sizeof(uint64_t) - 1;
 394         len /= sizeof(uint64_t);
 395
 396         return len;
 397 }
 398
 399 static inline int verify_sec_ctx_len(void *p)
 400 {
 401         struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
 402         int len;
 403
 404         if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE)
 405                 return -EINVAL;
 406
 407         len = pfkey_sec_ctx_len(sec_ctx);
 408
 409         if (sec_ctx->sadb_x_sec_len != len)
 410                 return -EINVAL;
 411
 412         return 0;
 413 }
 414
 415 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
 416 {
 417         struct xfrm_user_sec_ctx *uctx = NULL;
 418         int ctx_size = sec_ctx->sadb_x_ctx_len;
 419
 420         uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
 421
 422         if (!uctx)
 423                 return NULL;
 424
 425         uctx->len = pfkey_sec_ctx_len(sec_ctx);
 426         uctx->exttype = sec_ctx->sadb_x_sec_exttype;
 427         uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
 428         uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
 429         uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
 430         memcpy(uctx + 1, sec_ctx + 1,
 431                uctx->ctx_len);
 432
 433         return uctx;
 434 }
 435
 436 static int present_and_same_family(struct sadb_address *src,
 437                                    struct sadb_address *dst)
 438 {
 439         struct sockaddr *s_addr, *d_addr;
 440
 441         if (!src || !dst)
 442                 return 0;
 443
 444         s_addr = (struct sockaddr *)(src + 1);
 445         d_addr = (struct sockaddr *)(dst + 1);
 446         if (s_addr->sa_family != d_addr->sa_family)
 447                 return 0;
 448         if (s_addr->sa_family != AF_INET
 449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 450             && s_addr->sa_family != AF_INET6
 451 #endif
 452                 )
 453                 return 0;
 454
 455         return 1;
 456 }
 457
 458 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 459 {
 460         char *p = (char *) hdr;
 461         int len = skb->len;
 462
 463         len -= sizeof(*hdr);
 464         p += sizeof(*hdr);
 465         while (len > 0) {
 466                 struct sadb_ext *ehdr = (struct sadb_ext *) p;
 467                 uint16_t ext_type;
 468                 int ext_len;
 469
 470                 ext_len  = ehdr->sadb_ext_len;
 471                 ext_len *= sizeof(uint64_t);
 472                 ext_type = ehdr->sadb_ext_type;
 473                 if (ext_len < sizeof(uint64_t) ||
 474                     ext_len > len ||
 475                     ext_type == SADB_EXT_RESERVED)
 476                         return -EINVAL;
 477
 478                 if (ext_type <= SADB_EXT_MAX) {
 479                         int min = (int) sadb_ext_min_len[ext_type];
 480                         if (ext_len < min)
 481                                 return -EINVAL;
 482                         if (ext_hdrs[ext_type-1] != NULL)
 483                                 return -EINVAL;
 484                         if (ext_type == SADB_EXT_ADDRESS_SRC ||
 485                             ext_type == SADB_EXT_ADDRESS_DST ||
 486                             ext_type == SADB_EXT_ADDRESS_PROXY ||
 487                             ext_type == SADB_X_EXT_NAT_T_OA) {
 488                                 if (verify_address_len(p))
 489                                         return -EINVAL;
 490                         }
 491                         if (ext_type == SADB_X_EXT_SEC_CTX) {
 492                                 if (verify_sec_ctx_len(p))
 493                                         return -EINVAL;
 494                         }
 495                         ext_hdrs[ext_type-1] = p;
 496                 }
 497                 p   += ext_len;
 498                 len -= ext_len;
 499         }
 500
 501         return 0;
 502 }
 503
 504 static uint16_t
 505 pfkey_satype2proto(uint8_t satype)
 506 {
 507         switch (satype) {
 508         case SADB_SATYPE_UNSPEC:
 509                 return IPSEC_PROTO_ANY;
 510         case SADB_SATYPE_AH:
 511                 return IPPROTO_AH;
 512         case SADB_SATYPE_ESP:
 513                 return IPPROTO_ESP;
 514         case SADB_X_SATYPE_IPCOMP:
 515                 return IPPROTO_COMP;
 516                 break;
 517         default:
 518                 return 0;
 519         }
 520         /* NOTREACHED */
 521 }
 522
 523 static uint8_t
 524 pfkey_proto2satype(uint16_t proto)
 525 {
 526         switch (proto) {
 527         case IPPROTO_AH:
 528                 return SADB_SATYPE_AH;
 529         case IPPROTO_ESP:
 530                 return SADB_SATYPE_ESP;
 531         case IPPROTO_COMP:
 532                 return SADB_X_SATYPE_IPCOMP;
 533                 break;
 534         default:
 535                 return 0;
 536         }
 537         /* NOTREACHED */
 538 }
 539
 540 /* BTW, this scheme means that there is no way with PFKEY2 sockets to
 541  * say specifically 'just raw sockets' as we encode them as 255.
 542  */
 543
 544 static uint8_t pfkey_proto_to_xfrm(uint8_t proto)
 545 {
 546         return (proto == IPSEC_PROTO_ANY ? 0 : proto);
 547 }
 548
 549 static uint8_t pfkey_proto_from_xfrm(uint8_t proto)
 550 {
 551         return (proto ? proto : IPSEC_PROTO_ANY);
 552 }
 553
 554 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
 555                                      xfrm_address_t *xaddr)
 556 {
 557         switch (((struct sockaddr*)(addr + 1))->sa_family) {
 558         case AF_INET:
 559                 xaddr->a4 =
 560                         ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
 561                 return AF_INET;
 562 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 563         case AF_INET6:
 564                 memcpy(xaddr->a6,
 565                        &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
 566                        sizeof(struct in6_addr));
 567                 return AF_INET6;
 568 #endif
 569         default:
 570                 return 0;
 571         }
 572         /* NOTREACHED */
 573 }
 574
 575 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
 576 {
 577         struct sadb_sa *sa;
 578         struct sadb_address *addr;
 579         uint16_t proto;
 580         unsigned short family;
 581         xfrm_address_t *xaddr;
 582
 583         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 584         if (sa == NULL)
 585                 return NULL;
 586
 587         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
 588         if (proto == 0)
 589                 return NULL;
 590
 591         /* sadb_address_len should be checked by caller */
 592         addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1];
 593         if (addr == NULL)
 594                 return NULL;
 595
 596         family = ((struct sockaddr *)(addr + 1))->sa_family;
 597         switch (family) {
 598         case AF_INET:
 599                 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr;
 600                 break;
 601 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 602         case AF_INET6:
 603                 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr;
 604                 break;
 605 #endif
 606         default:
 607                 xaddr = NULL;
 608         }
 609
 610         if (!xaddr)
 611                 return NULL;
 612
 613         return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family);
 614 }
 615
 616 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1)))
 617 static int
 618 pfkey_sockaddr_size(sa_family_t family)
 619 {
 620         switch (family) {
 621         case AF_INET:
 622                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in));
 623 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 624         case AF_INET6:
 625                 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6));
 626 #endif
 627         default:
 628                 return 0;
 629         }
 630         /* NOTREACHED */
 631 }
 632
 633 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc)
 634 {
 635         struct sk_buff *skb;
 636         struct sadb_msg *hdr;
 637         struct sadb_sa *sa;
 638         struct sadb_lifetime *lifetime;
 639         struct sadb_address *addr;
 640         struct sadb_key *key;
 641         struct sadb_x_sa2 *sa2;
 642         struct sockaddr_in *sin;
 643         struct sadb_x_sec_ctx *sec_ctx;
 644         struct xfrm_sec_ctx *xfrm_ctx;
 645         int ctx_size = 0;
 646 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 647         struct sockaddr_in6 *sin6;
 648 #endif
 649         int size;
 650         int auth_key_size = 0;
 651         int encrypt_key_size = 0;
 652         int sockaddr_size;
 653         struct xfrm_encap_tmpl *natt = NULL;
 654
 655         /* address family check */
 656         sockaddr_size = pfkey_sockaddr_size(x->props.family);
 657         if (!sockaddr_size)
 658                 return ERR_PTR(-EINVAL);
 659
 660         /* base, SA, (lifetime (HSC),) address(SD), (address(P),)
 661            key(AE), (identity(SD),) (sensitivity)> */
 662         size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) +
 663                 sizeof(struct sadb_lifetime) +
 664                 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) +
 665                 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) +
 666                         sizeof(struct sadb_address)*2 +
 667                                 sockaddr_size*2 +
 668                                         sizeof(struct sadb_x_sa2);
 669
 670         if ((xfrm_ctx = x->security)) {
 671                 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
 672                 size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
 673         }
 674
 675         /* identity & sensitivity */
 676
 677         if ((x->props.family == AF_INET &&
 678              x->sel.saddr.a4 != x->props.saddr.a4)
 679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 680             || (x->props.family == AF_INET6 &&
 681                 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr)))
 682 #endif
 683                 )
 684                 size += sizeof(struct sadb_address) + sockaddr_size;
 685
 686         if (add_keys) {
 687                 if (x->aalg && x->aalg->alg_key_len) {
 688                         auth_key_size =
 689                                 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8);
 690                         size += sizeof(struct sadb_key) + auth_key_size;
 691                 }
 692                 if (x->ealg && x->ealg->alg_key_len) {
 693                         encrypt_key_size =
 694                                 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8);
 695                         size += sizeof(struct sadb_key) + encrypt_key_size;
 696                 }
 697         }
 698         if (x->encap)
 699                 natt = x->encap;
 700
 701         if (natt && natt->encap_type) {
 702                 size += sizeof(struct sadb_x_nat_t_type);
 703                 size += sizeof(struct sadb_x_nat_t_port);
 704                 size += sizeof(struct sadb_x_nat_t_port);
 705         }
 706
 707         skb =  alloc_skb(size + 16, GFP_ATOMIC);
 708         if (skb == NULL)
 709                 return ERR_PTR(-ENOBUFS);
 710
 711         /* call should fill header later */
 712         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
 713         memset(hdr, 0, size);   /* XXX do we need this ? */
 714         hdr->sadb_msg_len = size / sizeof(uint64_t);
 715
 716         /* sa */
 717         sa = (struct sadb_sa *)  skb_put(skb, sizeof(struct sadb_sa));
 718         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
 719         sa->sadb_sa_exttype = SADB_EXT_SA;
 720         sa->sadb_sa_spi = x->id.spi;
 721         sa->sadb_sa_replay = x->props.replay_window;
 722         switch (x->km.state) {
 723         case XFRM_STATE_VALID:
 724                 sa->sadb_sa_state = x->km.dying ?
 725                         SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
 726                 break;
 727         case XFRM_STATE_ACQ:
 728                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
 729                 break;
 730         default:
 731                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
 732                 break;
 733         }
 734         sa->sadb_sa_auth = 0;
 735         if (x->aalg) {
 736                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
 737                 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0;
 738         }
 739         sa->sadb_sa_encrypt = 0;
 740         BUG_ON(x->ealg && x->calg);
 741         if (x->ealg) {
 742                 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0);
 743                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 744         }
 745         /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */
 746         if (x->calg) {
 747                 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0);
 748                 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0;
 749         }
 750
 751         sa->sadb_sa_flags = 0;
 752         if (x->props.flags & XFRM_STATE_NOECN)
 753                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
 754         if (x->props.flags & XFRM_STATE_DECAP_DSCP)
 755                 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
 756         if (x->props.flags & XFRM_STATE_NOPMTUDISC)
 757                 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
 758
 759         /* hard time */
 760         if (hsc & 2) {
 761                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 762                                                              sizeof(struct sadb_lifetime));
 763                 lifetime->sadb_lifetime_len =
 764                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 765                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
 766                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.hard_packet_limit);
 767                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit);
 768                 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds;
 769                 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds;
 770         }
 771         /* soft time */
 772         if (hsc & 1) {
 773                 lifetime = (struct sadb_lifetime *)  skb_put(skb,
 774                                                              sizeof(struct sadb_lifetime));
 775                 lifetime->sadb_lifetime_len =
 776                         sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 777                 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
 778                 lifetime->sadb_lifetime_allocations =  _X2KEY(x->lft.soft_packet_limit);
 779                 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit);
 780                 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds;
 781                 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds;
 782         }
 783         /* current time */
 784         lifetime = (struct sadb_lifetime *)  skb_put(skb,
 785                                                      sizeof(struct sadb_lifetime));
 786         lifetime->sadb_lifetime_len =
 787                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
 788         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
 789         lifetime->sadb_lifetime_allocations = x->curlft.packets;
 790         lifetime->sadb_lifetime_bytes = x->curlft.bytes;
 791         lifetime->sadb_lifetime_addtime = x->curlft.add_time;
 792         lifetime->sadb_lifetime_usetime = x->curlft.use_time;
 793         /* src address */
 794         addr = (struct sadb_address*) skb_put(skb,
 795                                               sizeof(struct sadb_address)+sockaddr_size);
 796         addr->sadb_address_len =
 797                 (sizeof(struct sadb_address)+sockaddr_size)/
 798                         sizeof(uint64_t);
 799         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
 800         /* "if the ports are non-zero, then the sadb_address_proto field,
 801            normally zero, MUST be filled in with the transport
 802            protocol's number." - RFC2367 */
 803         addr->sadb_address_proto = 0;
 804         addr->sadb_address_reserved = 0;
 805         if (x->props.family == AF_INET) {
 806                 addr->sadb_address_prefixlen = 32;
 807
 808                 sin = (struct sockaddr_in *) (addr + 1);
 809                 sin->sin_family = AF_INET;
 810                 sin->sin_addr.s_addr = x->props.saddr.a4;
 811                 sin->sin_port = 0;
 812                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 813         }
 814 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 815         else if (x->props.family == AF_INET6) {
 816                 addr->sadb_address_prefixlen = 128;
 817
 818                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 819                 sin6->sin6_family = AF_INET6;
 820                 sin6->sin6_port = 0;
 821                 sin6->sin6_flowinfo = 0;
 822                 memcpy(&sin6->sin6_addr, x->props.saddr.a6,
 823                        sizeof(struct in6_addr));
 824                 sin6->sin6_scope_id = 0;
 825         }
 826 #endif
 827         else
 828                 BUG();
 829
 830         /* dst address */
 831         addr = (struct sadb_address*) skb_put(skb,
 832                                               sizeof(struct sadb_address)+sockaddr_size);
 833         addr->sadb_address_len =
 834                 (sizeof(struct sadb_address)+sockaddr_size)/
 835                         sizeof(uint64_t);
 836         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
 837         addr->sadb_address_proto = 0;
 838         addr->sadb_address_prefixlen = 32; /* XXX */
 839         addr->sadb_address_reserved = 0;
 840         if (x->props.family == AF_INET) {
 841                 sin = (struct sockaddr_in *) (addr + 1);
 842                 sin->sin_family = AF_INET;
 843                 sin->sin_addr.s_addr = x->id.daddr.a4;
 844                 sin->sin_port = 0;
 845                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 846
 847                 if (x->sel.saddr.a4 != x->props.saddr.a4) {
 848                         addr = (struct sadb_address*) skb_put(skb,
 849                                 sizeof(struct sadb_address)+sockaddr_size);
 850                         addr->sadb_address_len =
 851                                 (sizeof(struct sadb_address)+sockaddr_size)/
 852                                 sizeof(uint64_t);
 853                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 854                         addr->sadb_address_proto =
 855                                 pfkey_proto_from_xfrm(x->sel.proto);
 856                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 857                         addr->sadb_address_reserved = 0;
 858
 859                         sin = (struct sockaddr_in *) (addr + 1);
 860                         sin->sin_family = AF_INET;
 861                         sin->sin_addr.s_addr = x->sel.saddr.a4;
 862                         sin->sin_port = x->sel.sport;
 863                         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 864                 }
 865         }
 866 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 867         else if (x->props.family == AF_INET6) {
 868                 addr->sadb_address_prefixlen = 128;
 869
 870                 sin6 = (struct sockaddr_in6 *) (addr + 1);
 871                 sin6->sin6_family = AF_INET6;
 872                 sin6->sin6_port = 0;
 873                 sin6->sin6_flowinfo = 0;
 874                 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr));
 875                 sin6->sin6_scope_id = 0;
 876
 877                 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6,
 878                             sizeof(struct in6_addr))) {
 879                         addr = (struct sadb_address *) skb_put(skb,
 880                                 sizeof(struct sadb_address)+sockaddr_size);
 881                         addr->sadb_address_len =
 882                                 (sizeof(struct sadb_address)+sockaddr_size)/
 883                                 sizeof(uint64_t);
 884                         addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY;
 885                         addr->sadb_address_proto =
 886                                 pfkey_proto_from_xfrm(x->sel.proto);
 887                         addr->sadb_address_prefixlen = x->sel.prefixlen_s;
 888                         addr->sadb_address_reserved = 0;
 889
 890                         sin6 = (struct sockaddr_in6 *) (addr + 1);
 891                         sin6->sin6_family = AF_INET6;
 892                         sin6->sin6_port = x->sel.sport;
 893                         sin6->sin6_flowinfo = 0;
 894                         memcpy(&sin6->sin6_addr, x->sel.saddr.a6,
 895                                sizeof(struct in6_addr));
 896                         sin6->sin6_scope_id = 0;
 897                 }
 898         }
 899 #endif
 900         else
 901                 BUG();
 902
 903         /* auth key */
 904         if (add_keys && auth_key_size) {
 905                 key = (struct sadb_key *) skb_put(skb,
 906                                                   sizeof(struct sadb_key)+auth_key_size);
 907                 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) /
 908                         sizeof(uint64_t);
 909                 key->sadb_key_exttype = SADB_EXT_KEY_AUTH;
 910                 key->sadb_key_bits = x->aalg->alg_key_len;
 911                 key->sadb_key_reserved = 0;
 912                 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8);
 913         }
 914         /* encrypt key */
 915         if (add_keys && encrypt_key_size) {
 916                 key = (struct sadb_key *) skb_put(skb,
 917                                                   sizeof(struct sadb_key)+encrypt_key_size);
 918                 key->sadb_key_len = (sizeof(struct sadb_key) +
 919                                      encrypt_key_size) / sizeof(uint64_t);
 920                 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT;
 921                 key->sadb_key_bits = x->ealg->alg_key_len;
 922                 key->sadb_key_reserved = 0;
 923                 memcpy(key + 1, x->ealg->alg_key,
 924                        (x->ealg->alg_key_len+7)/8);
 925         }
 926
 927         /* sa */
 928         sa2 = (struct sadb_x_sa2 *)  skb_put(skb, sizeof(struct sadb_x_sa2));
 929         sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t);
 930         sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
 931         sa2->sadb_x_sa2_mode = x->props.mode + 1;
 932         sa2->sadb_x_sa2_reserved1 = 0;
 933         sa2->sadb_x_sa2_reserved2 = 0;
 934         sa2->sadb_x_sa2_sequence = 0;
 935         sa2->sadb_x_sa2_reqid = x->props.reqid;
 936
 937         if (natt && natt->encap_type) {
 938                 struct sadb_x_nat_t_type *n_type;
 939                 struct sadb_x_nat_t_port *n_port;
 940
 941                 /* type */
 942                 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type));
 943                 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t);
 944                 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE;
 945                 n_type->sadb_x_nat_t_type_type = natt->encap_type;
 946                 n_type->sadb_x_nat_t_type_reserved[0] = 0;
 947                 n_type->sadb_x_nat_t_type_reserved[1] = 0;
 948                 n_type->sadb_x_nat_t_type_reserved[2] = 0;
 949
 950                 /* source port */
 951                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 952                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 953                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
 954                 n_port->sadb_x_nat_t_port_port = natt->encap_sport;
 955                 n_port->sadb_x_nat_t_port_reserved = 0;
 956
 957                 /* dest port */
 958                 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
 959                 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
 960                 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
 961                 n_port->sadb_x_nat_t_port_port = natt->encap_dport;
 962                 n_port->sadb_x_nat_t_port_reserved = 0;
 963         }
 964
 965         /* security context */
 966         if (xfrm_ctx) {
 967                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
 968                                 sizeof(struct sadb_x_sec_ctx) + ctx_size);
 969                 sec_ctx->sadb_x_sec_len =
 970                   (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
 971                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
 972                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
 973                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
 974                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
 975                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
 976                        xfrm_ctx->ctx_len);
 977         }
 978
 979         return skb;
 980 }
 981
 982 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
 983                                                 void **ext_hdrs)
 984 {
 985         struct xfrm_state *x;
 986         struct sadb_lifetime *lifetime;
 987         struct sadb_sa *sa;
 988         struct sadb_key *key;
 989         struct sadb_x_sec_ctx *sec_ctx;
 990         uint16_t proto;
 991         int err;
 992
 993
 994         sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1];
 995         if (!sa ||
 996             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
 997                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
 998                 return ERR_PTR(-EINVAL);
 999         if (hdr->sadb_msg_satype == SADB_SATYPE_ESP &&
1000             !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1])
1001                 return ERR_PTR(-EINVAL);
1002         if (hdr->sadb_msg_satype == SADB_SATYPE_AH &&
1003             !ext_hdrs[SADB_EXT_KEY_AUTH-1])
1004                 return ERR_PTR(-EINVAL);
1005         if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] !=
1006             !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1])
1007                 return ERR_PTR(-EINVAL);
1008
1009         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1010         if (proto == 0)
1011                 return ERR_PTR(-EINVAL);
1012
1013         /* default error is no buffer space */
1014         err = -ENOBUFS;
1015
1016         /* RFC2367:
1017
1018    Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message.
1019    SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not
1020    sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state.
1021    Therefore, the sadb_sa_state field of all submitted SAs MUST be
1022    SADB_SASTATE_MATURE and the kernel MUST return an error if this is
1023    not true.
1024
1025            However, KAME setkey always uses SADB_SASTATE_LARVAL.
1026            Hence, we have to _ignore_ sadb_sa_state, which is also reasonable.
1027          */
1028         if (sa->sadb_sa_auth > SADB_AALG_MAX ||
1029             (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP &&
1030              sa->sadb_sa_encrypt > SADB_X_CALG_MAX) ||
1031             sa->sadb_sa_encrypt > SADB_EALG_MAX)
1032                 return ERR_PTR(-EINVAL);
1033         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1034         if (key != NULL &&
1035             sa->sadb_sa_auth != SADB_X_AALG_NULL &&
1036             ((key->sadb_key_bits+7) / 8 == 0 ||
1037              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1038                 return ERR_PTR(-EINVAL);
1039         key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1040         if (key != NULL &&
1041             sa->sadb_sa_encrypt != SADB_EALG_NULL &&
1042             ((key->sadb_key_bits+7) / 8 == 0 ||
1043              (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t)))
1044                 return ERR_PTR(-EINVAL);
1045
1046         x = xfrm_state_alloc();
1047         if (x == NULL)
1048                 return ERR_PTR(-ENOBUFS);
1049
1050         x->id.proto = proto;
1051         x->id.spi = sa->sadb_sa_spi;
1052         x->props.replay_window = sa->sadb_sa_replay;
1053         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN)
1054                 x->props.flags |= XFRM_STATE_NOECN;
1055         if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
1056                 x->props.flags |= XFRM_STATE_DECAP_DSCP;
1057         if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
1058                 x->props.flags |= XFRM_STATE_NOPMTUDISC;
1059
1060         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
1061         if (lifetime != NULL) {
1062                 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1063                 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1064                 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1065                 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1066         }
1067         lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1];
1068         if (lifetime != NULL) {
1069                 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
1070                 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
1071                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
1072                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
1073         }
1074
1075         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
1076         if (sec_ctx != NULL) {
1077                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
1078
1079                 if (!uctx)
1080                         goto out;
1081
1082                 err = security_xfrm_state_alloc(x, uctx);
1083                 kfree(uctx);
1084
1085                 if (err)
1086                         goto out;
1087         }
1088
1089         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
1090         if (sa->sadb_sa_auth) {
1091                 int keysize = 0;
1092                 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth);
1093                 if (!a) {
1094                         err = -ENOSYS;
1095                         goto out;
1096                 }
1097                 if (key)
1098                         keysize = (key->sadb_key_bits + 7) / 8;
1099                 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL);
1100                 if (!x->aalg)
1101                         goto out;
1102                 strcpy(x->aalg->alg_name, a->name);
1103                 x->aalg->alg_key_len = 0;
1104                 if (key) {
1105                         x->aalg->alg_key_len = key->sadb_key_bits;
1106                         memcpy(x->aalg->alg_key, key+1, keysize);
1107                 }
1108                 x->props.aalgo = sa->sadb_sa_auth;
1109                 /* x->algo.flags = sa->sadb_sa_flags; */
1110         }
1111         if (sa->sadb_sa_encrypt) {
1112                 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) {
1113                         struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt);
1114                         if (!a) {
1115                                 err = -ENOSYS;
1116                                 goto out;
1117                         }
1118                         x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL);
1119                         if (!x->calg)
1120                                 goto out;
1121                         strcpy(x->calg->alg_name, a->name);
1122                         x->props.calgo = sa->sadb_sa_encrypt;
1123                 } else {
1124                         int keysize = 0;
1125                         struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt);
1126                         if (!a) {
1127                                 err = -ENOSYS;
1128                                 goto out;
1129                         }
1130                         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1];
1131                         if (key)
1132                                 keysize = (key->sadb_key_bits + 7) / 8;
1133                         x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL);
1134                         if (!x->ealg)
1135                                 goto out;
1136                         strcpy(x->ealg->alg_name, a->name);
1137                         x->ealg->alg_key_len = 0;
1138                         if (key) {
1139                                 x->ealg->alg_key_len = key->sadb_key_bits;
1140                                 memcpy(x->ealg->alg_key, key+1, keysize);
1141                         }
1142                         x->props.ealgo = sa->sadb_sa_encrypt;
1143                 }
1144         }
1145         /* x->algo.flags = sa->sadb_sa_flags; */
1146
1147         x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1148                                                     &x->props.saddr);
1149         if (!x->props.family) {
1150                 err = -EAFNOSUPPORT;
1151                 goto out;
1152         }
1153         pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1],
1154                                   &x->id.daddr);
1155
1156         if (ext_hdrs[SADB_X_EXT_SA2-1]) {
1157                 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1];
1158                 x->props.mode = sa2->sadb_x_sa2_mode;
1159                 if (x->props.mode)
1160                         x->props.mode--;
1161                 x->props.reqid = sa2->sadb_x_sa2_reqid;
1162         }
1163
1164         if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) {
1165                 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1];
1166
1167                 /* Nobody uses this, but we try. */
1168                 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr);
1169                 x->sel.prefixlen_s = addr->sadb_address_prefixlen;
1170         }
1171
1172         if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) {
1173                 struct sadb_x_nat_t_type* n_type;
1174                 struct xfrm_encap_tmpl *natt;
1175
1176                 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL);
1177                 if (!x->encap)
1178                         goto out;
1179
1180                 natt = x->encap;
1181                 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1];
1182                 natt->encap_type = n_type->sadb_x_nat_t_type_type;
1183
1184                 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) {
1185                         struct sadb_x_nat_t_port* n_port =
1186                                 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1];
1187                         natt->encap_sport = n_port->sadb_x_nat_t_port_port;
1188                 }
1189                 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) {
1190                         struct sadb_x_nat_t_port* n_port =
1191                                 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1];
1192                         natt->encap_dport = n_port->sadb_x_nat_t_port_port;
1193                 }
1194         }
1195
1196         err = xfrm_init_state(x);
1197         if (err)
1198                 goto out;
1199
1200         x->km.seq = hdr->sadb_msg_seq;
1201         return x;
1202
1203 out:
1204         x->km.state = XFRM_STATE_DEAD;
1205         xfrm_state_put(x);
1206         return ERR_PTR(err);
1207 }
1208
1209 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1210 {
1211         return -EOPNOTSUPP;
1212 }
1213
1214 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1215 {
1216         struct sk_buff *resp_skb;
1217         struct sadb_x_sa2 *sa2;
1218         struct sadb_address *saddr, *daddr;
1219         struct sadb_msg *out_hdr;
1220         struct xfrm_state *x = NULL;
1221         u8 mode;
1222         u32 reqid;
1223         u8 proto;
1224         unsigned short family;
1225         xfrm_address_t *xsaddr = NULL, *xdaddr = NULL;
1226
1227         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1228                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1229                 return -EINVAL;
1230
1231         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1232         if (proto == 0)
1233                 return -EINVAL;
1234
1235         if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) {
1236                 mode = sa2->sadb_x_sa2_mode - 1;
1237                 reqid = sa2->sadb_x_sa2_reqid;
1238         } else {
1239                 mode = 0;
1240                 reqid = 0;
1241         }
1242
1243         saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1];
1244         daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1];
1245
1246         family = ((struct sockaddr *)(saddr + 1))->sa_family;
1247         switch (family) {
1248         case AF_INET:
1249                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr;
1250                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr;
1251                 break;
1252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1253         case AF_INET6:
1254                 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr;
1255                 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr;
1256                 break;
1257 #endif
1258         }
1259
1260         if (hdr->sadb_msg_seq) {
1261                 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1262                 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) {
1263                         xfrm_state_put(x);
1264                         x = NULL;
1265                 }
1266         }
1267
1268         if (!x)
1269                 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family);
1270
1271         if (x == NULL)
1272                 return -ENOENT;
1273
1274         resp_skb = ERR_PTR(-ENOENT);
1275
1276         spin_lock_bh(&x->lock);
1277         if (x->km.state != XFRM_STATE_DEAD) {
1278                 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1];
1279                 u32 min_spi, max_spi;
1280
1281                 if (range != NULL) {
1282                         min_spi = range->sadb_spirange_min;
1283                         max_spi = range->sadb_spirange_max;
1284                 } else {
1285                         min_spi = 0x100;
1286                         max_spi = 0x0fffffff;
1287                 }
1288                 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi));
1289                 if (x->id.spi)
1290                         resp_skb = pfkey_xfrm_state2msg(x, 0, 3);
1291         }
1292         spin_unlock_bh(&x->lock);
1293
1294         if (IS_ERR(resp_skb)) {
1295                 xfrm_state_put(x);
1296                 return  PTR_ERR(resp_skb);
1297         }
1298
1299         out_hdr = (struct sadb_msg *) resp_skb->data;
1300         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1301         out_hdr->sadb_msg_type = SADB_GETSPI;
1302         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1303         out_hdr->sadb_msg_errno = 0;
1304         out_hdr->sadb_msg_reserved = 0;
1305         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1306         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1307
1308         xfrm_state_put(x);
1309
1310         pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk);
1311
1312         return 0;
1313 }
1314
1315 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1316 {
1317         struct xfrm_state *x;
1318
1319         if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8)
1320                 return -EOPNOTSUPP;
1321
1322         if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0)
1323                 return 0;
1324
1325         x = xfrm_find_acq_byseq(hdr->sadb_msg_seq);
1326         if (x == NULL)
1327                 return 0;
1328
1329         spin_lock_bh(&x->lock);
1330         if (x->km.state == XFRM_STATE_ACQ) {
1331                 x->km.state = XFRM_STATE_ERROR;
1332                 wake_up(&km_waitq);
1333         }
1334         spin_unlock_bh(&x->lock);
1335         xfrm_state_put(x);
1336         return 0;
1337 }
1338
1339 static inline int event2poltype(int event)
1340 {
1341         switch (event) {
1342         case XFRM_MSG_DELPOLICY:
1343                 return SADB_X_SPDDELETE;
1344         case XFRM_MSG_NEWPOLICY:
1345                 return SADB_X_SPDADD;
1346         case XFRM_MSG_UPDPOLICY:
1347                 return SADB_X_SPDUPDATE;
1348         case XFRM_MSG_POLEXPIRE:
1349         //      return SADB_X_SPDEXPIRE;
1350         default:
1351                 printk("pfkey: Unknown policy event %d\n", event);
1352                 break;
1353         }
1354
1355         return 0;
1356 }
1357
1358 static inline int event2keytype(int event)
1359 {
1360         switch (event) {
1361         case XFRM_MSG_DELSA:
1362                 return SADB_DELETE;
1363         case XFRM_MSG_NEWSA:
1364                 return SADB_ADD;
1365         case XFRM_MSG_UPDSA:
1366                 return SADB_UPDATE;
1367         case XFRM_MSG_EXPIRE:
1368                 return SADB_EXPIRE;
1369         default:
1370                 printk("pfkey: Unknown SA event %d\n", event);
1371                 break;
1372         }
1373
1374         return 0;
1375 }
1376
1377 /* ADD/UPD/DEL */
1378 static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
1379 {
1380         struct sk_buff *skb;
1381         struct sadb_msg *hdr;
1382         int hsc = 3;
1383
1384         if (c->event == XFRM_MSG_DELSA)
1385                 hsc = 0;
1386
1387         skb = pfkey_xfrm_state2msg(x, 0, hsc);
1388
1389         if (IS_ERR(skb))
1390                 return PTR_ERR(skb);
1391
1392         hdr = (struct sadb_msg *) skb->data;
1393         hdr->sadb_msg_version = PF_KEY_V2;
1394         hdr->sadb_msg_type = event2keytype(c->event);
1395         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1396         hdr->sadb_msg_errno = 0;
1397         hdr->sadb_msg_reserved = 0;
1398         hdr->sadb_msg_seq = c->seq;
1399         hdr->sadb_msg_pid = c->pid;
1400
1401         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1402
1403         return 0;
1404 }
1405
1406 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1407 {
1408         struct xfrm_state *x;
1409         int err;
1410         struct km_event c;
1411
1412         xfrm_probe_algs();
1413
1414         x = pfkey_msg2xfrm_state(hdr, ext_hdrs);
1415         if (IS_ERR(x))
1416                 return PTR_ERR(x);
1417
1418         xfrm_state_hold(x);
1419         if (hdr->sadb_msg_type == SADB_ADD)
1420                 err = xfrm_state_add(x);
1421         else
1422                 err = xfrm_state_update(x);
1423
1424         if (err < 0) {
1425                 x->km.state = XFRM_STATE_DEAD;
1426                 __xfrm_state_put(x);
1427                 goto out;
1428         }
1429
1430         if (hdr->sadb_msg_type == SADB_ADD)
1431                 c.event = XFRM_MSG_NEWSA;
1432         else
1433                 c.event = XFRM_MSG_UPDSA;
1434         c.seq = hdr->sadb_msg_seq;
1435         c.pid = hdr->sadb_msg_pid;
1436         km_state_notify(x, &c);
1437 out:
1438         xfrm_state_put(x);
1439         return err;
1440 }
1441
1442 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1443 {
1444         struct xfrm_state *x;
1445         struct km_event c;
1446         int err;
1447
1448         if (!ext_hdrs[SADB_EXT_SA-1] ||
1449             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1450                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1451                 return -EINVAL;
1452
1453         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1454         if (x == NULL)
1455                 return -ESRCH;
1456
1457         if (xfrm_state_kern(x)) {
1458                 xfrm_state_put(x);
1459                 return -EPERM;
1460         }
1461
1462         err = xfrm_state_delete(x);
1463         if (err < 0) {
1464                 xfrm_state_put(x);
1465                 return err;
1466         }
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         xfrm_state_put(x);
1473
1474         return err;
1475 }
1476
1477 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1478 {
1479         __u8 proto;
1480         struct sk_buff *out_skb;
1481         struct sadb_msg *out_hdr;
1482         struct xfrm_state *x;
1483
1484         if (!ext_hdrs[SADB_EXT_SA-1] ||
1485             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
1486                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]))
1487                 return -EINVAL;
1488
1489         x = pfkey_xfrm_state_lookup(hdr, ext_hdrs);
1490         if (x == NULL)
1491                 return -ESRCH;
1492
1493         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1494         proto = x->id.proto;
1495         xfrm_state_put(x);
1496         if (IS_ERR(out_skb))
1497                 return  PTR_ERR(out_skb);
1498
1499         out_hdr = (struct sadb_msg *) out_skb->data;
1500         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
1501         out_hdr->sadb_msg_type = SADB_DUMP;
1502         out_hdr->sadb_msg_satype = pfkey_proto2satype(proto);
1503         out_hdr->sadb_msg_errno = 0;
1504         out_hdr->sadb_msg_reserved = 0;
1505         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
1506         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
1507         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
1508
1509         return 0;
1510 }
1511
1512 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig,
1513                                               gfp_t allocation)
1514 {
1515         struct sk_buff *skb;
1516         struct sadb_msg *hdr;
1517         int len, auth_len, enc_len, i;
1518
1519         auth_len = xfrm_count_auth_supported();
1520         if (auth_len) {
1521                 auth_len *= sizeof(struct sadb_alg);
1522                 auth_len += sizeof(struct sadb_supported);
1523         }
1524
1525         enc_len = xfrm_count_enc_supported();
1526         if (enc_len) {
1527                 enc_len *= sizeof(struct sadb_alg);
1528                 enc_len += sizeof(struct sadb_supported);
1529         }
1530
1531         len = enc_len + auth_len + sizeof(struct sadb_msg);
1532
1533         skb = alloc_skb(len + 16, allocation);
1534         if (!skb)
1535                 goto out_put_algs;
1536
1537         hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr));
1538         pfkey_hdr_dup(hdr, orig);
1539         hdr->sadb_msg_errno = 0;
1540         hdr->sadb_msg_len = len / sizeof(uint64_t);
1541
1542         if (auth_len) {
1543                 struct sadb_supported *sp;
1544                 struct sadb_alg *ap;
1545
1546                 sp = (struct sadb_supported *) skb_put(skb, auth_len);
1547                 ap = (struct sadb_alg *) (sp + 1);
1548
1549                 sp->sadb_supported_len = auth_len / sizeof(uint64_t);
1550                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
1551
1552                 for (i = 0; ; i++) {
1553                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
1554                         if (!aalg)
1555                                 break;
1556                         if (aalg->available)
1557                                 *ap++ = aalg->desc;
1558                 }
1559         }
1560
1561         if (enc_len) {
1562                 struct sadb_supported *sp;
1563                 struct sadb_alg *ap;
1564
1565                 sp = (struct sadb_supported *) skb_put(skb, enc_len);
1566                 ap = (struct sadb_alg *) (sp + 1);
1567
1568                 sp->sadb_supported_len = enc_len / sizeof(uint64_t);
1569                 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
1570
1571                 for (i = 0; ; i++) {
1572                         struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
1573                         if (!ealg)
1574                                 break;
1575                         if (ealg->available)
1576                                 *ap++ = ealg->desc;
1577                 }
1578         }
1579
1580 out_put_algs:
1581         return skb;
1582 }
1583
1584 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1585 {
1586         struct pfkey_sock *pfk = pfkey_sk(sk);
1587         struct sk_buff *supp_skb;
1588
1589         if (hdr->sadb_msg_satype > SADB_SATYPE_MAX)
1590                 return -EINVAL;
1591
1592         if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) {
1593                 if (pfk->registered&(1<<hdr->sadb_msg_satype))
1594                         return -EEXIST;
1595                 pfk->registered |= (1<<hdr->sadb_msg_satype);
1596         }
1597
1598         xfrm_probe_algs();
1599
1600         supp_skb = compose_sadb_supported(hdr, GFP_KERNEL);
1601         if (!supp_skb) {
1602                 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC)
1603                         pfk->registered &= ~(1<<hdr->sadb_msg_satype);
1604
1605                 return -ENOBUFS;
1606         }
1607
1608         pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk);
1609
1610         return 0;
1611 }
1612
1613 static int key_notify_sa_flush(struct km_event *c)
1614 {
1615         struct sk_buff *skb;
1616         struct sadb_msg *hdr;
1617
1618         skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
1619         if (!skb)
1620                 return -ENOBUFS;
1621         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1622         hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto);
1623         hdr->sadb_msg_type = SADB_FLUSH;
1624         hdr->sadb_msg_seq = c->seq;
1625         hdr->sadb_msg_pid = c->pid;
1626         hdr->sadb_msg_version = PF_KEY_V2;
1627         hdr->sadb_msg_errno = (uint8_t) 0;
1628         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
1629
1630         pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
1631
1632         return 0;
1633 }
1634
1635 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1636 {
1637         unsigned proto;
1638         struct km_event c;
1639
1640         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1641         if (proto == 0)
1642                 return -EINVAL;
1643
1644         xfrm_state_flush(proto);
1645         c.data.proto = proto;
1646         c.seq = hdr->sadb_msg_seq;
1647         c.pid = hdr->sadb_msg_pid;
1648         c.event = XFRM_MSG_FLUSHSA;
1649         km_state_notify(NULL, &c);
1650
1651         return 0;
1652 }
1653
1654 struct pfkey_dump_data
1655 {
1656         struct sk_buff *skb;
1657         struct sadb_msg *hdr;
1658         struct sock *sk;
1659 };
1660
1661 static int dump_sa(struct xfrm_state *x, int count, void *ptr)
1662 {
1663         struct pfkey_dump_data *data = ptr;
1664         struct sk_buff *out_skb;
1665         struct sadb_msg *out_hdr;
1666
1667         out_skb = pfkey_xfrm_state2msg(x, 1, 3);
1668         if (IS_ERR(out_skb))
1669                 return PTR_ERR(out_skb);
1670
1671         out_hdr = (struct sadb_msg *) out_skb->data;
1672         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
1673         out_hdr->sadb_msg_type = SADB_DUMP;
1674         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
1675         out_hdr->sadb_msg_errno = 0;
1676         out_hdr->sadb_msg_reserved = 0;
1677         out_hdr->sadb_msg_seq = count;
1678         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
1679         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
1680         return 0;
1681 }
1682
1683 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1684 {
1685         u8 proto;
1686         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
1687
1688         proto = pfkey_satype2proto(hdr->sadb_msg_satype);
1689         if (proto == 0)
1690                 return -EINVAL;
1691
1692         return xfrm_state_walk(proto, dump_sa, &data);
1693 }
1694
1695 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
1696 {
1697         struct pfkey_sock *pfk = pfkey_sk(sk);
1698         int satype = hdr->sadb_msg_satype;
1699
1700         if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) {
1701                 /* XXX we mangle packet... */
1702                 hdr->sadb_msg_errno = 0;
1703                 if (satype != 0 && satype != 1)
1704                         return -EINVAL;
1705                 pfk->promisc = satype;
1706         }
1707         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL);
1708         return 0;
1709 }
1710
1711 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr)
1712 {
1713         int i;
1714         u32 reqid = *(u32*)ptr;
1715
1716         for (i=0; i<xp->xfrm_nr; i++) {
1717                 if (xp->xfrm_vec[i].reqid == reqid)
1718                         return -EEXIST;
1719         }
1720         return 0;
1721 }
1722
1723 static u32 gen_reqid(void)
1724 {
1725         u32 start;
1726         static u32 reqid = IPSEC_MANUAL_REQID_MAX;
1727
1728         start = reqid;
1729         do {
1730                 ++reqid;
1731                 if (reqid == 0)
1732                         reqid = IPSEC_MANUAL_REQID_MAX+1;
1733                 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST)
1734                         return reqid;
1735         } while (reqid != start);
1736         return 0;
1737 }
1738
1739 static int
1740 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
1741 {
1742         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
1743         struct sockaddr_in *sin;
1744 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1745         struct sockaddr_in6 *sin6;
1746 #endif
1747
1748         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
1749                 return -ELOOP;
1750
1751         if (rq->sadb_x_ipsecrequest_mode == 0)
1752                 return -EINVAL;
1753
1754         t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */
1755         t->mode = rq->sadb_x_ipsecrequest_mode-1;
1756         if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE)
1757                 t->optional = 1;
1758         else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) {
1759                 t->reqid = rq->sadb_x_ipsecrequest_reqid;
1760                 if (t->reqid > IPSEC_MANUAL_REQID_MAX)
1761                         t->reqid = 0;
1762                 if (!t->reqid && !(t->reqid = gen_reqid()))
1763                         return -ENOBUFS;
1764         }
1765
1766         /* addresses present only in tunnel mode */
1767         if (t->mode) {
1768                 switch (xp->family) {
1769                 case AF_INET:
1770                         sin = (void*)(rq+1);
1771                         if (sin->sin_family != AF_INET)
1772                                 return -EINVAL;
1773                         t->saddr.a4 = sin->sin_addr.s_addr;
1774                         sin++;
1775                         if (sin->sin_family != AF_INET)
1776                                 return -EINVAL;
1777                         t->id.daddr.a4 = sin->sin_addr.s_addr;
1778                         break;
1779 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1780                 case AF_INET6:
1781                         sin6 = (void *)(rq+1);
1782                         if (sin6->sin6_family != AF_INET6)
1783                                 return -EINVAL;
1784                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1785                         sin6++;
1786                         if (sin6->sin6_family != AF_INET6)
1787                                 return -EINVAL;
1788                         memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
1789                         break;
1790 #endif
1791                 default:
1792                         return -EINVAL;
1793                 }
1794         }
1795         /* No way to set this via kame pfkey */
1796         t->aalgos = t->ealgos = t->calgos = ~0;
1797         xp->xfrm_nr++;
1798         return 0;
1799 }
1800
1801 static int
1802 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
1803 {
1804         int err;
1805         int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
1806         struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
1807
1808         while (len >= sizeof(struct sadb_x_ipsecrequest)) {
1809                 if ((err = parse_ipsecrequest(xp, rq)) < 0)
1810                         return err;
1811                 len -= rq->sadb_x_ipsecrequest_len;
1812                 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len);
1813         }
1814         return 0;
1815 }
1816
1817 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
1818 {
1819   struct xfrm_sec_ctx *xfrm_ctx = xp->security;
1820
1821         if (xfrm_ctx) {
1822                 int len = sizeof(struct sadb_x_sec_ctx);
1823                 len += xfrm_ctx->ctx_len;
1824                 return PFKEY_ALIGN8(len);
1825         }
1826         return 0;
1827 }
1828
1829 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
1830 {
1831         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1832         int socklen = (xp->family == AF_INET ?
1833                        sizeof(struct sockaddr_in) :
1834                        sizeof(struct sockaddr_in6));
1835
1836         return sizeof(struct sadb_msg) +
1837                 (sizeof(struct sadb_lifetime) * 3) +
1838                 (sizeof(struct sadb_address) * 2) +
1839                 (sockaddr_size * 2) +
1840                 sizeof(struct sadb_x_policy) +
1841                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
1842                                 (socklen * 2))) +
1843                 pfkey_xfrm_policy2sec_ctx_size(xp);
1844 }
1845
1846 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
1847 {
1848         struct sk_buff *skb;
1849         int size;
1850
1851         size = pfkey_xfrm_policy2msg_size(xp);
1852
1853         skb =  alloc_skb(size + 16, GFP_ATOMIC);
1854         if (skb == NULL)
1855                 return ERR_PTR(-ENOBUFS);
1856
1857         return skb;
1858 }
1859
1860 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir)
1861 {
1862         struct sadb_msg *hdr;
1863         struct sadb_address *addr;
1864         struct sadb_lifetime *lifetime;
1865         struct sadb_x_policy *pol;
1866         struct sockaddr_in   *sin;
1867         struct sadb_x_sec_ctx *sec_ctx;
1868         struct xfrm_sec_ctx *xfrm_ctx;
1869 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1870         struct sockaddr_in6  *sin6;
1871 #endif
1872         int i;
1873         int size;
1874         int sockaddr_size = pfkey_sockaddr_size(xp->family);
1875         int socklen = (xp->family == AF_INET ?
1876                        sizeof(struct sockaddr_in) :
1877                        sizeof(struct sockaddr_in6));
1878
1879         size = pfkey_xfrm_policy2msg_size(xp);
1880
1881         /* call should fill header later */
1882         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
1883         memset(hdr, 0, size);   /* XXX do we need this ? */
1884
1885         /* src address */
1886         addr = (struct sadb_address*) skb_put(skb,
1887                                               sizeof(struct sadb_address)+sockaddr_size);
1888         addr->sadb_address_len =
1889                 (sizeof(struct sadb_address)+sockaddr_size)/
1890                         sizeof(uint64_t);
1891         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
1892         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1893         addr->sadb_address_prefixlen = xp->selector.prefixlen_s;
1894         addr->sadb_address_reserved = 0;
1895         /* src address */
1896         if (xp->family == AF_INET) {
1897                 sin = (struct sockaddr_in *) (addr + 1);
1898                 sin->sin_family = AF_INET;
1899                 sin->sin_addr.s_addr = xp->selector.saddr.a4;
1900                 sin->sin_port = xp->selector.sport;
1901                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1902         }
1903 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1904         else if (xp->family == AF_INET6) {
1905                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1906                 sin6->sin6_family = AF_INET6;
1907                 sin6->sin6_port = xp->selector.sport;
1908                 sin6->sin6_flowinfo = 0;
1909                 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6,
1910                        sizeof(struct in6_addr));
1911                 sin6->sin6_scope_id = 0;
1912         }
1913 #endif
1914         else
1915                 BUG();
1916
1917         /* dst address */
1918         addr = (struct sadb_address*) skb_put(skb,
1919                                               sizeof(struct sadb_address)+sockaddr_size);
1920         addr->sadb_address_len =
1921                 (sizeof(struct sadb_address)+sockaddr_size)/
1922                         sizeof(uint64_t);
1923         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
1924         addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto);
1925         addr->sadb_address_prefixlen = xp->selector.prefixlen_d;
1926         addr->sadb_address_reserved = 0;
1927         if (xp->family == AF_INET) {
1928                 sin = (struct sockaddr_in *) (addr + 1);
1929                 sin->sin_family = AF_INET;
1930                 sin->sin_addr.s_addr = xp->selector.daddr.a4;
1931                 sin->sin_port = xp->selector.dport;
1932                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1933         }
1934 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1935         else if (xp->family == AF_INET6) {
1936                 sin6 = (struct sockaddr_in6 *) (addr + 1);
1937                 sin6->sin6_family = AF_INET6;
1938                 sin6->sin6_port = xp->selector.dport;
1939                 sin6->sin6_flowinfo = 0;
1940                 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6,
1941                        sizeof(struct in6_addr));
1942                 sin6->sin6_scope_id = 0;
1943         }
1944 #endif
1945         else
1946                 BUG();
1947
1948         /* hard time */
1949         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1950                                                      sizeof(struct sadb_lifetime));
1951         lifetime->sadb_lifetime_len =
1952                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1953         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
1954         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.hard_packet_limit);
1955         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit);
1956         lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds;
1957         lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds;
1958         /* soft time */
1959         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1960                                                      sizeof(struct sadb_lifetime));
1961         lifetime->sadb_lifetime_len =
1962                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1963         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
1964         lifetime->sadb_lifetime_allocations =  _X2KEY(xp->lft.soft_packet_limit);
1965         lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit);
1966         lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds;
1967         lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds;
1968         /* current time */
1969         lifetime = (struct sadb_lifetime *)  skb_put(skb,
1970                                                      sizeof(struct sadb_lifetime));
1971         lifetime->sadb_lifetime_len =
1972                 sizeof(struct sadb_lifetime)/sizeof(uint64_t);
1973         lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
1974         lifetime->sadb_lifetime_allocations = xp->curlft.packets;
1975         lifetime->sadb_lifetime_bytes = xp->curlft.bytes;
1976         lifetime->sadb_lifetime_addtime = xp->curlft.add_time;
1977         lifetime->sadb_lifetime_usetime = xp->curlft.use_time;
1978
1979         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
1980         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
1981         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1982         pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD;
1983         if (xp->action == XFRM_POLICY_ALLOW) {
1984                 if (xp->xfrm_nr)
1985                         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
1986                 else
1987                         pol->sadb_x_policy_type = IPSEC_POLICY_NONE;
1988         }
1989         pol->sadb_x_policy_dir = dir+1;
1990         pol->sadb_x_policy_id = xp->index;
1991         pol->sadb_x_policy_priority = xp->priority;
1992
1993         for (i=0; i<xp->xfrm_nr; i++) {
1994                 struct sadb_x_ipsecrequest *rq;
1995                 struct xfrm_tmpl *t = xp->xfrm_vec + i;
1996                 int req_size;
1997
1998                 req_size = sizeof(struct sadb_x_ipsecrequest);
1999                 if (t->mode)
2000                         req_size += 2*socklen;
2001                 else
2002                         size -= 2*socklen;
2003                 rq = (void*)skb_put(skb, req_size);
2004                 pol->sadb_x_policy_len += req_size/8;
2005                 memset(rq, 0, sizeof(*rq));
2006                 rq->sadb_x_ipsecrequest_len = req_size;
2007                 rq->sadb_x_ipsecrequest_proto = t->id.proto;
2008                 rq->sadb_x_ipsecrequest_mode = t->mode+1;
2009                 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE;
2010                 if (t->reqid)
2011                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE;
2012                 if (t->optional)
2013                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
2014                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
2015                 if (t->mode) {
2016                         switch (xp->family) {
2017                         case AF_INET:
2018                                 sin = (void*)(rq+1);
2019                                 sin->sin_family = AF_INET;
2020                                 sin->sin_addr.s_addr = t->saddr.a4;
2021                                 sin->sin_port = 0;
2022                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2023                                 sin++;
2024                                 sin->sin_family = AF_INET;
2025                                 sin->sin_addr.s_addr = t->id.daddr.a4;
2026                                 sin->sin_port = 0;
2027                                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2028                                 break;
2029 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2030                         case AF_INET6:
2031                                 sin6 = (void*)(rq+1);
2032                                 sin6->sin6_family = AF_INET6;
2033                                 sin6->sin6_port = 0;
2034                                 sin6->sin6_flowinfo = 0;
2035                                 memcpy(&sin6->sin6_addr, t->saddr.a6,
2036                                        sizeof(struct in6_addr));
2037                                 sin6->sin6_scope_id = 0;
2038
2039                                 sin6++;
2040                                 sin6->sin6_family = AF_INET6;
2041                                 sin6->sin6_port = 0;
2042                                 sin6->sin6_flowinfo = 0;
2043                                 memcpy(&sin6->sin6_addr, t->id.daddr.a6,
2044                                        sizeof(struct in6_addr));
2045                                 sin6->sin6_scope_id = 0;
2046                                 break;
2047 #endif
2048                         default:
2049                                 break;
2050                         }
2051                 }
2052         }
2053
2054         /* security context */
2055         if ((xfrm_ctx = xp->security)) {
2056                 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
2057
2058                 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
2059                 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
2060                 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
2061                 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
2062                 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
2063                 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
2064                 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
2065                        xfrm_ctx->ctx_len);
2066         }
2067
2068         hdr->sadb_msg_len = size / sizeof(uint64_t);
2069         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
2070 }
2071
2072 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2073 {
2074         struct sk_buff *out_skb;
2075         struct sadb_msg *out_hdr;
2076         int err;
2077
2078         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2079         if (IS_ERR(out_skb)) {
2080                 err = PTR_ERR(out_skb);
2081                 goto out;
2082         }
2083         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2084
2085         out_hdr = (struct sadb_msg *) out_skb->data;
2086         out_hdr->sadb_msg_version = PF_KEY_V2;
2087
2088         if (c->data.byid && c->event == XFRM_MSG_DELPOLICY)
2089                 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
2090         else
2091                 out_hdr->sadb_msg_type = event2poltype(c->event);
2092         out_hdr->sadb_msg_errno = 0;
2093         out_hdr->sadb_msg_seq = c->seq;
2094         out_hdr->sadb_msg_pid = c->pid;
2095         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
2096 out:
2097         return 0;
2098
2099 }
2100
2101 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2102 {
2103         int err = 0;
2104         struct sadb_lifetime *lifetime;
2105         struct sadb_address *sa;
2106         struct sadb_x_policy *pol;
2107         struct xfrm_policy *xp;
2108         struct km_event c;
2109         struct sadb_x_sec_ctx *sec_ctx;
2110
2111         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2112                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2113             !ext_hdrs[SADB_X_EXT_POLICY-1])
2114                 return -EINVAL;
2115
2116         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2117         if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC)
2118                 return -EINVAL;
2119         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2120                 return -EINVAL;
2121
2122         xp = xfrm_policy_alloc(GFP_KERNEL);
2123         if (xp == NULL)
2124                 return -ENOBUFS;
2125
2126         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2127                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2128         xp->priority = pol->sadb_x_policy_priority;
2129
2130         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2131         xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr);
2132         if (!xp->family) {
2133                 err = -EINVAL;
2134                 goto out;
2135         }
2136         xp->selector.family = xp->family;
2137         xp->selector.prefixlen_s = sa->sadb_address_prefixlen;
2138         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2139         xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2140         if (xp->selector.sport)
2141                 xp->selector.sport_mask = ~0;
2142
2143         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2144         pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr);
2145         xp->selector.prefixlen_d = sa->sadb_address_prefixlen;
2146
2147         /* Amusing, we set this twice.  KAME apps appear to set same value
2148          * in both addresses.
2149          */
2150         xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2151
2152         xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2153         if (xp->selector.dport)
2154                 xp->selector.dport_mask = ~0;
2155
2156         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2157         if (sec_ctx != NULL) {
2158                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2159
2160                 if (!uctx) {
2161                         err = -ENOBUFS;
2162                         goto out;
2163                 }
2164
2165                 err = security_xfrm_policy_alloc(xp, uctx);
2166                 kfree(uctx);
2167
2168                 if (err)
2169                         goto out;
2170         }
2171
2172         xp->lft.soft_byte_limit = XFRM_INF;
2173         xp->lft.hard_byte_limit = XFRM_INF;
2174         xp->lft.soft_packet_limit = XFRM_INF;
2175         xp->lft.hard_packet_limit = XFRM_INF;
2176         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) {
2177                 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2178                 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2179                 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2180                 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2181         }
2182         if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) {
2183                 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations);
2184                 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes);
2185                 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
2186                 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
2187         }
2188         xp->xfrm_nr = 0;
2189         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2190             (err = parse_ipsecrequests(xp, pol)) < 0)
2191                 goto out;
2192
2193         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
2194                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
2195
2196         if (err)
2197                 goto out;
2198
2199         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
2200                 c.event = XFRM_MSG_UPDPOLICY;
2201         else
2202                 c.event = XFRM_MSG_NEWPOLICY;
2203
2204         c.seq = hdr->sadb_msg_seq;
2205         c.pid = hdr->sadb_msg_pid;
2206
2207         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2208         xfrm_pol_put(xp);
2209         return 0;
2210
2211 out:
2212         security_xfrm_policy_free(xp);
2213         kfree(xp);
2214         return err;
2215 }
2216
2217 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2218 {
2219         int err;
2220         struct sadb_address *sa;
2221         struct sadb_x_policy *pol;
2222         struct xfrm_policy *xp, tmp;
2223         struct xfrm_selector sel;
2224         struct km_event c;
2225         struct sadb_x_sec_ctx *sec_ctx;
2226
2227         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2228                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
2229             !ext_hdrs[SADB_X_EXT_POLICY-1])
2230                 return -EINVAL;
2231
2232         pol = ext_hdrs[SADB_X_EXT_POLICY-1];
2233         if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX)
2234                 return -EINVAL;
2235
2236         memset(&sel, 0, sizeof(sel));
2237
2238         sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
2239         sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr);
2240         sel.prefixlen_s = sa->sadb_address_prefixlen;
2241         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2242         sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port;
2243         if (sel.sport)
2244                 sel.sport_mask = ~0;
2245
2246         sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1],
2247         pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr);
2248         sel.prefixlen_d = sa->sadb_address_prefixlen;
2249         sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto);
2250         sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port;
2251         if (sel.dport)
2252                 sel.dport_mask = ~0;
2253
2254         sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
2255         memset(&tmp, 0, sizeof(struct xfrm_policy));
2256
2257         if (sec_ctx != NULL) {
2258                 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2259
2260                 if (!uctx)
2261                         return -ENOMEM;
2262
2263                 err = security_xfrm_policy_alloc(&tmp, uctx);
2264                 kfree(uctx);
2265
2266                 if (err)
2267                         return err;
2268         }
2269
2270         xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1);
2271         security_xfrm_policy_free(&tmp);
2272         if (xp == NULL)
2273                 return -ENOENT;
2274
2275         err = 0;
2276
2277         c.seq = hdr->sadb_msg_seq;
2278         c.pid = hdr->sadb_msg_pid;
2279         c.event = XFRM_MSG_DELPOLICY;
2280         km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
2281
2282         xfrm_pol_put(xp);
2283         return err;
2284 }
2285
2286 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
2287 {
2288         int err;
2289         struct sk_buff *out_skb;
2290         struct sadb_msg *out_hdr;
2291         err = 0;
2292
2293         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2294         if (IS_ERR(out_skb)) {
2295                 err =  PTR_ERR(out_skb);
2296                 goto out;
2297         }
2298         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2299
2300         out_hdr = (struct sadb_msg *) out_skb->data;
2301         out_hdr->sadb_msg_version = hdr->sadb_msg_version;
2302         out_hdr->sadb_msg_type = hdr->sadb_msg_type;
2303         out_hdr->sadb_msg_satype = 0;
2304         out_hdr->sadb_msg_errno = 0;
2305         out_hdr->sadb_msg_seq = hdr->sadb_msg_seq;
2306         out_hdr->sadb_msg_pid = hdr->sadb_msg_pid;
2307         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
2308         err = 0;
2309
2310 out:
2311         return err;
2312 }
2313
2314 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2315 {
2316         unsigned int dir;
2317         int err;
2318         struct sadb_x_policy *pol;
2319         struct xfrm_policy *xp;
2320         struct km_event c;
2321
2322         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
2323                 return -EINVAL;
2324
2325         dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
2326         if (dir >= XFRM_POLICY_MAX)
2327                 return -EINVAL;
2328
2329         xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id,
2330                               hdr->sadb_msg_type == SADB_X_SPDDELETE2);
2331         if (xp == NULL)
2332                 return -ENOENT;
2333
2334         err = 0;
2335
2336         c.seq = hdr->sadb_msg_seq;
2337         c.pid = hdr->sadb_msg_pid;
2338         if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
2339                 c.data.byid = 1;
2340                 c.event = XFRM_MSG_DELPOLICY;
2341                 km_policy_notify(xp, dir, &c);
2342         } else {
2343                 err = key_pol_get_resp(sk, xp, hdr, dir);
2344         }
2345
2346         xfrm_pol_put(xp);
2347         return err;
2348 }
2349
2350 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr)
2351 {
2352         struct pfkey_dump_data *data = ptr;
2353         struct sk_buff *out_skb;
2354         struct sadb_msg *out_hdr;
2355
2356         out_skb = pfkey_xfrm_policy2msg_prep(xp);
2357         if (IS_ERR(out_skb))
2358                 return PTR_ERR(out_skb);
2359
2360         pfkey_xfrm_policy2msg(out_skb, xp, dir);
2361
2362         out_hdr = (struct sadb_msg *) out_skb->data;
2363         out_hdr->sadb_msg_version = data->hdr->sadb_msg_version;
2364         out_hdr->sadb_msg_type = SADB_X_SPDDUMP;
2365         out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC;
2366         out_hdr->sadb_msg_errno = 0;
2367         out_hdr->sadb_msg_seq = count;
2368         out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid;
2369         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk);
2370         return 0;
2371 }
2372
2373 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2374 {
2375         struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk };
2376
2377         return xfrm_policy_walk(dump_sp, &data);
2378 }
2379
2380 static int key_notify_policy_flush(struct km_event *c)
2381 {
2382         struct sk_buff *skb_out;
2383         struct sadb_msg *hdr;
2384
2385         skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
2386         if (!skb_out)
2387                 return -ENOBUFS;
2388         hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
2389         hdr->sadb_msg_type = SADB_X_SPDFLUSH;
2390         hdr->sadb_msg_seq = c->seq;
2391         hdr->sadb_msg_pid = c->pid;
2392         hdr->sadb_msg_version = PF_KEY_V2;
2393         hdr->sadb_msg_errno = (uint8_t) 0;
2394         hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
2395         pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
2396         return 0;
2397
2398 }
2399
2400 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
2401 {
2402         struct km_event c;
2403
2404         xfrm_policy_flush();
2405         c.event = XFRM_MSG_FLUSHPOLICY;
2406         c.pid = hdr->sadb_msg_pid;
2407         c.seq = hdr->sadb_msg_seq;
2408         km_policy_notify(NULL, 0, &c);
2409
2410         return 0;
2411 }
2412
2413 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb,
2414                              struct sadb_msg *hdr, void **ext_hdrs);
2415 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = {
2416         [SADB_RESERVED]         = pfkey_reserved,
2417         [SADB_GETSPI]           = pfkey_getspi,
2418         [SADB_UPDATE]           = pfkey_add,
2419         [SADB_ADD]              = pfkey_add,
2420         [SADB_DELETE]           = pfkey_delete,
2421         [SADB_GET]              = pfkey_get,
2422         [SADB_ACQUIRE]          = pfkey_acquire,
2423         [SADB_REGISTER]         = pfkey_register,
2424         [SADB_EXPIRE]           = NULL,
2425         [SADB_FLUSH]            = pfkey_flush,
2426         [SADB_DUMP]             = pfkey_dump,
2427         [SADB_X_PROMISC]        = pfkey_promisc,
2428         [SADB_X_PCHANGE]        = NULL,
2429         [SADB_X_SPDUPDATE]      = pfkey_spdadd,
2430         [SADB_X_SPDADD]         = pfkey_spdadd,
2431         [SADB_X_SPDDELETE]      = pfkey_spddelete,
2432         [SADB_X_SPDGET]         = pfkey_spdget,
2433         [SADB_X_SPDACQUIRE]     = NULL,
2434         [SADB_X_SPDDUMP]        = pfkey_spddump,
2435         [SADB_X_SPDFLUSH]       = pfkey_spdflush,
2436         [SADB_X_SPDSETIDX]      = pfkey_spdadd,
2437         [SADB_X_SPDDELETE2]     = pfkey_spdget,
2438 };
2439
2440 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr)
2441 {
2442         void *ext_hdrs[SADB_EXT_MAX];
2443         int err;
2444
2445         pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
2446                         BROADCAST_PROMISC_ONLY, NULL);
2447
2448         memset(ext_hdrs, 0, sizeof(ext_hdrs));
2449         err = parse_exthdrs(skb, hdr, ext_hdrs);
2450         if (!err) {
2451                 err = -EOPNOTSUPP;
2452                 if (pfkey_funcs[hdr->sadb_msg_type])
2453                         err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs);
2454         }
2455         return err;
2456 }
2457
2458 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp)
2459 {
2460         struct sadb_msg *hdr = NULL;
2461
2462         if (skb->len < sizeof(*hdr)) {
2463                 *errp = -EMSGSIZE;
2464         } else {
2465                 hdr = (struct sadb_msg *) skb->data;
2466                 if (hdr->sadb_msg_version != PF_KEY_V2 ||
2467                     hdr->sadb_msg_reserved != 0 ||
2468                     (hdr->sadb_msg_type <= SADB_RESERVED ||
2469                      hdr->sadb_msg_type > SADB_MAX)) {
2470                         hdr = NULL;
2471                         *errp = -EINVAL;
2472                 } else if (hdr->sadb_msg_len != (skb->len /
2473                                                  sizeof(uint64_t)) ||
2474                            hdr->sadb_msg_len < (sizeof(struct sadb_msg) /
2475                                                 sizeof(uint64_t))) {
2476                         hdr = NULL;
2477                         *errp = -EMSGSIZE;
2478                 } else {
2479                         *errp = 0;
2480                 }
2481         }
2482         return hdr;
2483 }
2484
2485 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2486 {
2487         return t->aalgos & (1 << d->desc.sadb_alg_id);
2488 }
2489
2490 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d)
2491 {
2492         return t->ealgos & (1 << d->desc.sadb_alg_id);
2493 }
2494
2495 static int count_ah_combs(struct xfrm_tmpl *t)
2496 {
2497         int i, sz = 0;
2498
2499         for (i = 0; ; i++) {
2500                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2501                 if (!aalg)
2502                         break;
2503                 if (aalg_tmpl_set(t, aalg) && aalg->available)
2504                         sz += sizeof(struct sadb_comb);
2505         }
2506         return sz + sizeof(struct sadb_prop);
2507 }
2508
2509 static int count_esp_combs(struct xfrm_tmpl *t)
2510 {
2511         int i, k, sz = 0;
2512
2513         for (i = 0; ; i++) {
2514                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2515                 if (!ealg)
2516                         break;
2517
2518                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2519                         continue;
2520
2521                 for (k = 1; ; k++) {
2522                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2523                         if (!aalg)
2524                                 break;
2525
2526                         if (aalg_tmpl_set(t, aalg) && aalg->available)
2527                                 sz += sizeof(struct sadb_comb);
2528                 }
2529         }
2530         return sz + sizeof(struct sadb_prop);
2531 }
2532
2533 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2534 {
2535         struct sadb_prop *p;
2536         int i;
2537
2538         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2539         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2540         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2541         p->sadb_prop_replay = 32;
2542         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2543
2544         for (i = 0; ; i++) {
2545                 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i);
2546                 if (!aalg)
2547                         break;
2548
2549                 if (aalg_tmpl_set(t, aalg) && aalg->available) {
2550                         struct sadb_comb *c;
2551                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2552                         memset(c, 0, sizeof(*c));
2553                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2554                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2555                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2556                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2557                         c->sadb_comb_hard_addtime = 24*60*60;
2558                         c->sadb_comb_soft_addtime = 20*60*60;
2559                         c->sadb_comb_hard_usetime = 8*60*60;
2560                         c->sadb_comb_soft_usetime = 7*60*60;
2561                 }
2562         }
2563 }
2564
2565 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
2566 {
2567         struct sadb_prop *p;
2568         int i, k;
2569
2570         p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop));
2571         p->sadb_prop_len = sizeof(struct sadb_prop)/8;
2572         p->sadb_prop_exttype = SADB_EXT_PROPOSAL;
2573         p->sadb_prop_replay = 32;
2574         memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved));
2575
2576         for (i=0; ; i++) {
2577                 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i);
2578                 if (!ealg)
2579                         break;
2580
2581                 if (!(ealg_tmpl_set(t, ealg) && ealg->available))
2582                         continue;
2583
2584                 for (k = 1; ; k++) {
2585                         struct sadb_comb *c;
2586                         struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k);
2587                         if (!aalg)
2588                                 break;
2589                         if (!(aalg_tmpl_set(t, aalg) && aalg->available))
2590                                 continue;
2591                         c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb));
2592                         memset(c, 0, sizeof(*c));
2593                         p->sadb_prop_len += sizeof(struct sadb_comb)/8;
2594                         c->sadb_comb_auth = aalg->desc.sadb_alg_id;
2595                         c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits;
2596                         c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits;
2597                         c->sadb_comb_encrypt = ealg->desc.sadb_alg_id;
2598                         c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits;
2599                         c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits;
2600                         c->sadb_comb_hard_addtime = 24*60*60;
2601                         c->sadb_comb_soft_addtime = 20*60*60;
2602                         c->sadb_comb_hard_usetime = 8*60*60;
2603                         c->sadb_comb_soft_usetime = 7*60*60;
2604                 }
2605         }
2606 }
2607
2608 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
2609 {
2610         return 0;
2611 }
2612
2613 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
2614 {
2615         struct sk_buff *out_skb;
2616         struct sadb_msg *out_hdr;
2617         int hard;
2618         int hsc;
2619
2620         hard = c->data.hard;
2621         if (hard)
2622                 hsc = 2;
2623         else
2624                 hsc = 1;
2625
2626         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
2627         if (IS_ERR(out_skb))
2628                 return PTR_ERR(out_skb);
2629
2630         out_hdr = (struct sadb_msg *) out_skb->data;
2631         out_hdr->sadb_msg_version = PF_KEY_V2;
2632         out_hdr->sadb_msg_type = SADB_EXPIRE;
2633         out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2634         out_hdr->sadb_msg_errno = 0;
2635         out_hdr->sadb_msg_reserved = 0;
2636         out_hdr->sadb_msg_seq = 0;
2637         out_hdr->sadb_msg_pid = 0;
2638
2639         pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2640         return 0;
2641 }
2642
2643 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
2644 {
2645         switch (c->event) {
2646         case XFRM_MSG_EXPIRE:
2647                 return key_notify_sa_expire(x, c);
2648         case XFRM_MSG_DELSA:
2649         case XFRM_MSG_NEWSA:
2650         case XFRM_MSG_UPDSA:
2651                 return key_notify_sa(x, c);
2652         case XFRM_MSG_FLUSHSA:
2653                 return key_notify_sa_flush(c);
2654         case XFRM_MSG_NEWAE: /* not yet supported */
2655                 break;
2656         default:
2657                 printk("pfkey: Unknown SA event %d\n", c->event);
2658                 break;
2659         }
2660
2661         return 0;
2662 }
2663
2664 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2665 {
2666         switch (c->event) {
2667         case XFRM_MSG_POLEXPIRE:
2668                 return key_notify_policy_expire(xp, c);
2669         case XFRM_MSG_DELPOLICY:
2670         case XFRM_MSG_NEWPOLICY:
2671         case XFRM_MSG_UPDPOLICY:
2672                 return key_notify_policy(xp, dir, c);
2673         case XFRM_MSG_FLUSHPOLICY:
2674                 return key_notify_policy_flush(c);
2675         default:
2676                 printk("pfkey: Unknown policy event %d\n", c->event);
2677                 break;
2678         }
2679
2680         return 0;
2681 }
2682
2683 static u32 get_acqseq(void)
2684 {
2685         u32 res;
2686         static u32 acqseq;
2687         static DEFINE_SPINLOCK(acqseq_lock);
2688
2689         spin_lock_bh(&acqseq_lock);
2690         res = (++acqseq ? : ++acqseq);
2691         spin_unlock_bh(&acqseq_lock);
2692         return res;
2693 }
2694
2695 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir)
2696 {
2697         struct sk_buff *skb;
2698         struct sadb_msg *hdr;
2699         struct sadb_address *addr;
2700         struct sadb_x_policy *pol;
2701         struct sockaddr_in *sin;
2702 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2703         struct sockaddr_in6 *sin6;
2704 #endif
2705         int sockaddr_size;
2706         int size;
2707
2708         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2709         if (!sockaddr_size)
2710                 return -EINVAL;
2711
2712         size = sizeof(struct sadb_msg) +
2713                 (sizeof(struct sadb_address) * 2) +
2714                 (sockaddr_size * 2) +
2715                 sizeof(struct sadb_x_policy);
2716
2717         if (x->id.proto == IPPROTO_AH)
2718                 size += count_ah_combs(t);
2719         else if (x->id.proto == IPPROTO_ESP)
2720                 size += count_esp_combs(t);
2721
2722         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2723         if (skb == NULL)
2724                 return -ENOMEM;
2725
2726         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2727         hdr->sadb_msg_version = PF_KEY_V2;
2728         hdr->sadb_msg_type = SADB_ACQUIRE;
2729         hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
2730         hdr->sadb_msg_len = size / sizeof(uint64_t);
2731         hdr->sadb_msg_errno = 0;
2732         hdr->sadb_msg_reserved = 0;
2733         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2734         hdr->sadb_msg_pid = 0;
2735
2736         /* src address */
2737         addr = (struct sadb_address*) skb_put(skb,
2738                                               sizeof(struct sadb_address)+sockaddr_size);
2739         addr->sadb_address_len =
2740                 (sizeof(struct sadb_address)+sockaddr_size)/
2741                         sizeof(uint64_t);
2742         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2743         addr->sadb_address_proto = 0;
2744         addr->sadb_address_reserved = 0;
2745         if (x->props.family == AF_INET) {
2746                 addr->sadb_address_prefixlen = 32;
2747
2748                 sin = (struct sockaddr_in *) (addr + 1);
2749                 sin->sin_family = AF_INET;
2750                 sin->sin_addr.s_addr = x->props.saddr.a4;
2751                 sin->sin_port = 0;
2752                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2753         }
2754 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2755         else if (x->props.family == AF_INET6) {
2756                 addr->sadb_address_prefixlen = 128;
2757
2758                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2759                 sin6->sin6_family = AF_INET6;
2760                 sin6->sin6_port = 0;
2761                 sin6->sin6_flowinfo = 0;
2762                 memcpy(&sin6->sin6_addr,
2763                        x->props.saddr.a6, sizeof(struct in6_addr));
2764                 sin6->sin6_scope_id = 0;
2765         }
2766 #endif
2767         else
2768                 BUG();
2769
2770         /* dst address */
2771         addr = (struct sadb_address*) skb_put(skb,
2772                                               sizeof(struct sadb_address)+sockaddr_size);
2773         addr->sadb_address_len =
2774                 (sizeof(struct sadb_address)+sockaddr_size)/
2775                         sizeof(uint64_t);
2776         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
2777         addr->sadb_address_proto = 0;
2778         addr->sadb_address_reserved = 0;
2779         if (x->props.family == AF_INET) {
2780                 addr->sadb_address_prefixlen = 32;
2781
2782                 sin = (struct sockaddr_in *) (addr + 1);
2783                 sin->sin_family = AF_INET;
2784                 sin->sin_addr.s_addr = x->id.daddr.a4;
2785                 sin->sin_port = 0;
2786                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2787         }
2788 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2789         else if (x->props.family == AF_INET6) {
2790                 addr->sadb_address_prefixlen = 128;
2791
2792                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2793                 sin6->sin6_family = AF_INET6;
2794                 sin6->sin6_port = 0;
2795                 sin6->sin6_flowinfo = 0;
2796                 memcpy(&sin6->sin6_addr,
2797                        x->id.daddr.a6, sizeof(struct in6_addr));
2798                 sin6->sin6_scope_id = 0;
2799         }
2800 #endif
2801         else
2802                 BUG();
2803
2804         pol = (struct sadb_x_policy *)  skb_put(skb, sizeof(struct sadb_x_policy));
2805         pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t);
2806         pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
2807         pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC;
2808         pol->sadb_x_policy_dir = dir+1;
2809         pol->sadb_x_policy_id = xp->index;
2810
2811         /* Set sadb_comb's. */
2812         if (x->id.proto == IPPROTO_AH)
2813                 dump_ah_combs(skb, t);
2814         else if (x->id.proto == IPPROTO_ESP)
2815                 dump_esp_combs(skb, t);
2816
2817         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
2818 }
2819
2820 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
2821                                                 u8 *data, int len, int *dir)
2822 {
2823         struct xfrm_policy *xp;
2824         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
2825         struct sadb_x_sec_ctx *sec_ctx;
2826
2827         switch (family) {
2828         case AF_INET:
2829                 if (opt != IP_IPSEC_POLICY) {
2830                         *dir = -EOPNOTSUPP;
2831                         return NULL;
2832                 }
2833                 break;
2834 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2835         case AF_INET6:
2836                 if (opt != IPV6_IPSEC_POLICY) {
2837                         *dir = -EOPNOTSUPP;
2838                         return NULL;
2839                 }
2840                 break;
2841 #endif
2842         default:
2843                 *dir = -EINVAL;
2844                 return NULL;
2845         }
2846
2847         *dir = -EINVAL;
2848
2849         if (len < sizeof(struct sadb_x_policy) ||
2850             pol->sadb_x_policy_len*8 > len ||
2851             pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS ||
2852             (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND))
2853                 return NULL;
2854
2855         xp = xfrm_policy_alloc(GFP_ATOMIC);
2856         if (xp == NULL) {
2857                 *dir = -ENOBUFS;
2858                 return NULL;
2859         }
2860
2861         xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ?
2862                       XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW);
2863
2864         xp->lft.soft_byte_limit = XFRM_INF;
2865         xp->lft.hard_byte_limit = XFRM_INF;
2866         xp->lft.soft_packet_limit = XFRM_INF;
2867         xp->lft.hard_packet_limit = XFRM_INF;
2868         xp->family = family;
2869
2870         xp->xfrm_nr = 0;
2871         if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC &&
2872             (*dir = parse_ipsecrequests(xp, pol)) < 0)
2873                 goto out;
2874
2875         /* security context too */
2876         if (len >= (pol->sadb_x_policy_len*8 +
2877             sizeof(struct sadb_x_sec_ctx))) {
2878                 char *p = (char *)pol;
2879                 struct xfrm_user_sec_ctx *uctx;
2880
2881                 p += pol->sadb_x_policy_len*8;
2882                 sec_ctx = (struct sadb_x_sec_ctx *)p;
2883                 if (len < pol->sadb_x_policy_len*8 +
2884                     sec_ctx->sadb_x_sec_len)
2885                         goto out;
2886                 if ((*dir = verify_sec_ctx_len(p)))
2887                         goto out;
2888                 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
2889                 *dir = security_xfrm_policy_alloc(xp, uctx);
2890                 kfree(uctx);
2891
2892                 if (*dir)
2893                         goto out;
2894         }
2895
2896         *dir = pol->sadb_x_policy_dir-1;
2897         return xp;
2898
2899 out:
2900         security_xfrm_policy_free(xp);
2901         kfree(xp);
2902         return NULL;
2903 }
2904
2905 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
2906 {
2907         struct sk_buff *skb;
2908         struct sadb_msg *hdr;
2909         struct sadb_sa *sa;
2910         struct sadb_address *addr;
2911         struct sadb_x_nat_t_port *n_port;
2912         struct sockaddr_in *sin;
2913 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2914         struct sockaddr_in6 *sin6;
2915 #endif
2916         int sockaddr_size;
2917         int size;
2918         __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0);
2919         struct xfrm_encap_tmpl *natt = NULL;
2920
2921         sockaddr_size = pfkey_sockaddr_size(x->props.family);
2922         if (!sockaddr_size)
2923                 return -EINVAL;
2924
2925         if (!satype)
2926                 return -EINVAL;
2927
2928         if (!x->encap)
2929                 return -EINVAL;
2930
2931         natt = x->encap;
2932
2933         /* Build an SADB_X_NAT_T_NEW_MAPPING message:
2934          *
2935          * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) |
2936          * ADDRESS_DST (new addr) | NAT_T_DPORT (new port)
2937          */
2938
2939         size = sizeof(struct sadb_msg) +
2940                 sizeof(struct sadb_sa) +
2941                 (sizeof(struct sadb_address) * 2) +
2942                 (sockaddr_size * 2) +
2943                 (sizeof(struct sadb_x_nat_t_port) * 2);
2944
2945         skb =  alloc_skb(size + 16, GFP_ATOMIC);
2946         if (skb == NULL)
2947                 return -ENOMEM;
2948
2949         hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
2950         hdr->sadb_msg_version = PF_KEY_V2;
2951         hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING;
2952         hdr->sadb_msg_satype = satype;
2953         hdr->sadb_msg_len = size / sizeof(uint64_t);
2954         hdr->sadb_msg_errno = 0;
2955         hdr->sadb_msg_reserved = 0;
2956         hdr->sadb_msg_seq = x->km.seq = get_acqseq();
2957         hdr->sadb_msg_pid = 0;
2958
2959         /* SA */
2960         sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa));
2961         sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t);
2962         sa->sadb_sa_exttype = SADB_EXT_SA;
2963         sa->sadb_sa_spi = x->id.spi;
2964         sa->sadb_sa_replay = 0;
2965         sa->sadb_sa_state = 0;
2966         sa->sadb_sa_auth = 0;
2967         sa->sadb_sa_encrypt = 0;
2968         sa->sadb_sa_flags = 0;
2969
2970         /* ADDRESS_SRC (old addr) */
2971         addr = (struct sadb_address*)
2972                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
2973         addr->sadb_address_len =
2974                 (sizeof(struct sadb_address)+sockaddr_size)/
2975                         sizeof(uint64_t);
2976         addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC;
2977         addr->sadb_address_proto = 0;
2978         addr->sadb_address_reserved = 0;
2979         if (x->props.family == AF_INET) {
2980                 addr->sadb_address_prefixlen = 32;
2981
2982                 sin = (struct sockaddr_in *) (addr + 1);
2983                 sin->sin_family = AF_INET;
2984                 sin->sin_addr.s_addr = x->props.saddr.a4;
2985                 sin->sin_port = 0;
2986                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
2987         }
2988 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2989         else if (x->props.family == AF_INET6) {
2990                 addr->sadb_address_prefixlen = 128;
2991
2992                 sin6 = (struct sockaddr_in6 *) (addr + 1);
2993                 sin6->sin6_family = AF_INET6;
2994                 sin6->sin6_port = 0;
2995                 sin6->sin6_flowinfo = 0;
2996                 memcpy(&sin6->sin6_addr,
2997                        x->props.saddr.a6, sizeof(struct in6_addr));
2998                 sin6->sin6_scope_id = 0;
2999         }
3000 #endif
3001         else
3002                 BUG();
3003
3004         /* NAT_T_SPORT (old port) */
3005         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3006         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3007         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT;
3008         n_port->sadb_x_nat_t_port_port = natt->encap_sport;
3009         n_port->sadb_x_nat_t_port_reserved = 0;
3010
3011         /* ADDRESS_DST (new addr) */
3012         addr = (struct sadb_address*)
3013                 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size);
3014         addr->sadb_address_len =
3015                 (sizeof(struct sadb_address)+sockaddr_size)/
3016                         sizeof(uint64_t);
3017         addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST;
3018         addr->sadb_address_proto = 0;
3019         addr->sadb_address_reserved = 0;
3020         if (x->props.family == AF_INET) {
3021                 addr->sadb_address_prefixlen = 32;
3022
3023                 sin = (struct sockaddr_in *) (addr + 1);
3024                 sin->sin_family = AF_INET;
3025                 sin->sin_addr.s_addr = ipaddr->a4;
3026                 sin->sin_port = 0;
3027                 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
3028         }
3029 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3030         else if (x->props.family == AF_INET6) {
3031                 addr->sadb_address_prefixlen = 128;
3032
3033                 sin6 = (struct sockaddr_in6 *) (addr + 1);
3034                 sin6->sin6_family = AF_INET6;
3035                 sin6->sin6_port = 0;
3036                 sin6->sin6_flowinfo = 0;
3037                 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr));
3038                 sin6->sin6_scope_id = 0;
3039         }
3040 #endif
3041         else
3042                 BUG();
3043
3044         /* NAT_T_DPORT (new port) */
3045         n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port));
3046         n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t);
3047         n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT;
3048         n_port->sadb_x_nat_t_port_port = sport;
3049         n_port->sadb_x_nat_t_port_reserved = 0;
3050
3051         return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL);
3052 }
3053
3054 static int pfkey_sendmsg(struct kiocb *kiocb,
3055                          struct socket *sock, struct msghdr *msg, size_t len)
3056 {
3057         struct sock *sk = sock->sk;
3058         struct sk_buff *skb = NULL;
3059         struct sadb_msg *hdr = NULL;
3060         int err;
3061
3062         err = -EOPNOTSUPP;
3063         if (msg->msg_flags & MSG_OOB)
3064                 goto out;
3065
3066         err = -EMSGSIZE;
3067         if ((unsigned)len > sk->sk_sndbuf - 32)
3068                 goto out;
3069
3070         err = -ENOBUFS;
3071         skb = alloc_skb(len, GFP_KERNEL);
3072         if (skb == NULL)
3073                 goto out;
3074
3075         err = -EFAULT;
3076         if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len))
3077                 goto out;
3078
3079         hdr = pfkey_get_base_msg(skb, &err);
3080         if (!hdr)
3081                 goto out;
3082
3083         mutex_lock(&xfrm_cfg_mutex);
3084         err = pfkey_process(sk, skb, hdr);
3085         mutex_unlock(&xfrm_cfg_mutex);
3086
3087 out:
3088         if (err && hdr && pfkey_error(hdr, err, sk) == 0)
3089                 err = 0;
3090         if (skb)
3091                 kfree_skb(skb);
3092
3093         return err ? : len;
3094 }
3095
3096 static int pfkey_recvmsg(struct kiocb *kiocb,
3097                          struct socket *sock, struct msghdr *msg, size_t len,
3098                          int flags)
3099 {
3100         struct sock *sk = sock->sk;
3101         struct sk_buff *skb;
3102         int copied, err;
3103
3104         err = -EINVAL;
3105         if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
3106                 goto out;
3107
3108         msg->msg_namelen = 0;
3109         skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
3110         if (skb == NULL)
3111                 goto out;
3112
3113         copied = skb->len;
3114         if (copied > len) {
3115                 msg->msg_flags |= MSG_TRUNC;
3116                 copied = len;
3117         }
3118
3119         skb->h.raw = skb->data;
3120         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
3121         if (err)
3122                 goto out_free;
3123
3124         sock_recv_timestamp(msg, sk, skb);
3125
3126         err = (flags & MSG_TRUNC) ? skb->len : copied;
3127
3128 out_free:
3129         skb_free_datagram(sk, skb);
3130 out:
3131         return err;
3132 }
3133
3134 static const struct proto_ops pfkey_ops = {
3135         .family         =       PF_KEY,
3136         .owner          =       THIS_MODULE,
3137         /* Operations that make no sense on pfkey sockets. */
3138         .bind           =       sock_no_bind,
3139         .connect        =       sock_no_connect,
3140         .socketpair     =       sock_no_socketpair,
3141         .accept         =       sock_no_accept,
3142         .getname        =       sock_no_getname,
3143         .ioctl          =       sock_no_ioctl,
3144         .listen         =       sock_no_listen,
3145         .shutdown       =       sock_no_shutdown,
3146         .setsockopt     =       sock_no_setsockopt,
3147         .getsockopt     =       sock_no_getsockopt,
3148         .mmap           =       sock_no_mmap,
3149         .sendpage       =       sock_no_sendpage,
3150
3151         /* Now the operations that really occur. */
3152         .release        =       pfkey_release,
3153         .poll           =       datagram_poll,
3154         .sendmsg        =       pfkey_sendmsg,
3155         .recvmsg        =       pfkey_recvmsg,
3156 };
3157
3158 static struct net_proto_family pfkey_family_ops = {
3159         .family =       PF_KEY,
3160         .create =       pfkey_create,
3161         .owner  =       THIS_MODULE,
3162 };
3163
3164 #ifdef CONFIG_PROC_FS
3165 static int pfkey_read_proc(char *buffer, char **start, off_t offset,
3166                            int length, int *eof, void *data)
3167 {
3168         off_t pos = 0;
3169         off_t begin = 0;
3170         int len = 0;
3171         struct sock *s;
3172         struct hlist_node *node;
3173
3174         len += sprintf(buffer,"sk       RefCnt Rmem   Wmem   User   Inode\n");
3175
3176         read_lock(&pfkey_table_lock);
3177
3178         sk_for_each(s, node, &pfkey_table) {
3179                 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu",
3180                                s,
3181                                atomic_read(&s->sk_refcnt),
3182                                atomic_read(&s->sk_rmem_alloc),
3183                                atomic_read(&s->sk_wmem_alloc),
3184                                sock_i_uid(s),
3185                                sock_i_ino(s)
3186                                );
3187
3188                 buffer[len++] = '\n';
3189
3190                 pos = begin + len;
3191                 if (pos < offset) {
3192                         len = 0;
3193                         begin = pos;
3194                 }
3195                 if(pos > offset + length)
3196                         goto done;
3197         }
3198         *eof = 1;
3199
3200 done:
3201         read_unlock(&pfkey_table_lock);
3202
3203         *start = buffer + (offset - begin);
3204         len -= (offset - begin);
3205
3206         if (len > length)
3207                 len = length;
3208         if (len < 0)
3209                 len = 0;
3210
3211         return len;
3212 }
3213 #endif
3214
3215 static struct xfrm_mgr pfkeyv2_mgr =
3216 {
3217         .id             = "pfkeyv2",
3218         .notify         = pfkey_send_notify,
3219         .acquire        = pfkey_send_acquire,
3220         .compile_policy = pfkey_compile_policy,
3221         .new_mapping    = pfkey_send_new_mapping,
3222         .notify_policy  = pfkey_send_policy_notify,
3223 };
3224
3225 static void __exit ipsec_pfkey_exit(void)
3226 {
3227         xfrm_unregister_km(&pfkeyv2_mgr);
3228         remove_proc_entry("net/pfkey", NULL);
3229         sock_unregister(PF_KEY);
3230         proto_unregister(&key_proto);
3231 }
3232
3233 static int __init ipsec_pfkey_init(void)
3234 {
3235         int err = proto_register(&key_proto, 0);
3236
3237         if (err != 0)
3238                 goto out;
3239
3240         err = sock_register(&pfkey_family_ops);
3241         if (err != 0)
3242                 goto out_unregister_key_proto;
3243 #ifdef CONFIG_PROC_FS
3244         err = -ENOMEM;
3245         if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL)
3246                 goto out_sock_unregister;
3247 #endif
3248         err = xfrm_register_km(&pfkeyv2_mgr);
3249         if (err != 0)
3250                 goto out_remove_proc_entry;
3251 out:
3252         return err;
3253 out_remove_proc_entry:
3254 #ifdef CONFIG_PROC_FS
3255         remove_proc_entry("net/pfkey", NULL);
3256 out_sock_unregister:
3257 #endif
3258         sock_unregister(PF_KEY);
3259 out_unregister_key_proto:
3260         proto_unregister(&key_proto);
3261         goto out;
3262 }
3263
3264 module_init(ipsec_pfkey_init);
3265 module_exit(ipsec_pfkey_exit);
3266 MODULE_LICENSE("GPL");
3267 MODULE_ALIAS_NETPROTO(PF_KEY);