1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <net/net_namespace.h> 30 #include <net/netns/generic.h> 31 #include <net/xfrm.h> 32 33 #include <net/sock.h> 34 35 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 36 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 37 38 static int pfkey_net_id __read_mostly; 39 struct netns_pfkey { 40 /* List of all pfkey sockets. */ 41 struct hlist_head table; 42 atomic_t socks_nr; 43 }; 44 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); 45 static DEFINE_RWLOCK(pfkey_table_lock); 46 static atomic_t pfkey_table_users = ATOMIC_INIT(0); 47 48 struct pfkey_sock { 49 /* struct sock must be the first member of struct pfkey_sock */ 50 struct sock sk; 51 int registered; 52 int promisc; 53 54 struct { 55 uint8_t msg_version; 56 uint32_t msg_pid; 57 int (*dump)(struct pfkey_sock *sk); 58 void (*done)(struct pfkey_sock *sk); 59 union { 60 struct xfrm_policy_walk policy; 61 struct xfrm_state_walk state; 62 } u; 63 struct sk_buff *skb; 64 } dump; 65 }; 66 67 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 68 { 69 return (struct pfkey_sock *)sk; 70 } 71 72 static int pfkey_can_dump(struct sock *sk) 73 { 74 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 75 return 1; 76 return 0; 77 } 78 79 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 80 { 81 if (pfk->dump.dump) { 82 if (pfk->dump.skb) { 83 kfree_skb(pfk->dump.skb); 84 pfk->dump.skb = NULL; 85 } 86 pfk->dump.done(pfk); 87 pfk->dump.dump = NULL; 88 pfk->dump.done = NULL; 89 } 90 } 91 92 static void pfkey_sock_destruct(struct sock *sk) 93 { 94 struct net *net = sock_net(sk); 95 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 96 97 pfkey_terminate_dump(pfkey_sk(sk)); 98 skb_queue_purge(&sk->sk_receive_queue); 99 100 if (!sock_flag(sk, SOCK_DEAD)) { 101 printk("Attempt to release alive pfkey socket: %p\n", sk); 102 return; 103 } 104 105 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 106 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 107 108 atomic_dec(&net_pfkey->socks_nr); 109 } 110 111 static void pfkey_table_grab(void) 112 { 113 write_lock_bh(&pfkey_table_lock); 114 115 if (atomic_read(&pfkey_table_users)) { 116 DECLARE_WAITQUEUE(wait, current); 117 118 add_wait_queue_exclusive(&pfkey_table_wait, &wait); 119 for(;;) { 120 set_current_state(TASK_UNINTERRUPTIBLE); 121 if (atomic_read(&pfkey_table_users) == 0) 122 break; 123 write_unlock_bh(&pfkey_table_lock); 124 schedule(); 125 write_lock_bh(&pfkey_table_lock); 126 } 127 128 __set_current_state(TASK_RUNNING); 129 remove_wait_queue(&pfkey_table_wait, &wait); 130 } 131 } 132 133 static __inline__ void pfkey_table_ungrab(void) 134 { 135 write_unlock_bh(&pfkey_table_lock); 136 wake_up(&pfkey_table_wait); 137 } 138 139 static __inline__ void pfkey_lock_table(void) 140 { 141 /* read_lock() synchronizes us to pfkey_table_grab */ 142 143 read_lock(&pfkey_table_lock); 144 atomic_inc(&pfkey_table_users); 145 read_unlock(&pfkey_table_lock); 146 } 147 148 static __inline__ void pfkey_unlock_table(void) 149 { 150 if (atomic_dec_and_test(&pfkey_table_users)) 151 wake_up(&pfkey_table_wait); 152 } 153 154 155 static const struct proto_ops pfkey_ops; 156 157 static void pfkey_insert(struct sock *sk) 158 { 159 struct net *net = sock_net(sk); 160 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 161 162 pfkey_table_grab(); 163 sk_add_node(sk, &net_pfkey->table); 164 pfkey_table_ungrab(); 165 } 166 167 static void pfkey_remove(struct sock *sk) 168 { 169 pfkey_table_grab(); 170 sk_del_node_init(sk); 171 pfkey_table_ungrab(); 172 } 173 174 static struct proto key_proto = { 175 .name = "KEY", 176 .owner = THIS_MODULE, 177 .obj_size = sizeof(struct pfkey_sock), 178 }; 179 180 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 181 int kern) 182 { 183 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 184 struct sock *sk; 185 int err; 186 187 if (!capable(CAP_NET_ADMIN)) 188 return -EPERM; 189 if (sock->type != SOCK_RAW) 190 return -ESOCKTNOSUPPORT; 191 if (protocol != PF_KEY_V2) 192 return -EPROTONOSUPPORT; 193 194 err = -ENOMEM; 195 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto); 196 if (sk == NULL) 197 goto out; 198 199 sock->ops = &pfkey_ops; 200 sock_init_data(sock, sk); 201 202 sk->sk_family = PF_KEY; 203 sk->sk_destruct = pfkey_sock_destruct; 204 205 atomic_inc(&net_pfkey->socks_nr); 206 207 pfkey_insert(sk); 208 209 return 0; 210 out: 211 return err; 212 } 213 214 static int pfkey_release(struct socket *sock) 215 { 216 struct sock *sk = sock->sk; 217 218 if (!sk) 219 return 0; 220 221 pfkey_remove(sk); 222 223 sock_orphan(sk); 224 sock->sk = NULL; 225 skb_queue_purge(&sk->sk_write_queue); 226 sock_put(sk); 227 228 return 0; 229 } 230 231 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 232 gfp_t allocation, struct sock *sk) 233 { 234 int err = -ENOBUFS; 235 236 sock_hold(sk); 237 if (*skb2 == NULL) { 238 if (atomic_read(&skb->users) != 1) { 239 *skb2 = skb_clone(skb, allocation); 240 } else { 241 *skb2 = skb; 242 atomic_inc(&skb->users); 243 } 244 } 245 if (*skb2 != NULL) { 246 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 247 skb_orphan(*skb2); 248 skb_set_owner_r(*skb2, sk); 249 skb_queue_tail(&sk->sk_receive_queue, *skb2); 250 sk->sk_data_ready(sk, (*skb2)->len); 251 *skb2 = NULL; 252 err = 0; 253 } 254 } 255 sock_put(sk); 256 return err; 257 } 258 259 /* Send SKB to all pfkey sockets matching selected criteria. */ 260 #define BROADCAST_ALL 0 261 #define BROADCAST_ONE 1 262 #define BROADCAST_REGISTERED 2 263 #define BROADCAST_PROMISC_ONLY 4 264 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 265 int broadcast_flags, struct sock *one_sk, 266 struct net *net) 267 { 268 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 269 struct sock *sk; 270 struct hlist_node *node; 271 struct sk_buff *skb2 = NULL; 272 int err = -ESRCH; 273 274 /* XXX Do we need something like netlink_overrun? I think 275 * XXX PF_KEY socket apps will not mind current behavior. 276 */ 277 if (!skb) 278 return -ENOMEM; 279 280 pfkey_lock_table(); 281 sk_for_each(sk, node, &net_pfkey->table) { 282 struct pfkey_sock *pfk = pfkey_sk(sk); 283 int err2; 284 285 /* Yes, it means that if you are meant to receive this 286 * pfkey message you receive it twice as promiscuous 287 * socket. 288 */ 289 if (pfk->promisc) 290 pfkey_broadcast_one(skb, &skb2, allocation, sk); 291 292 /* the exact target will be processed later */ 293 if (sk == one_sk) 294 continue; 295 if (broadcast_flags != BROADCAST_ALL) { 296 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 297 continue; 298 if ((broadcast_flags & BROADCAST_REGISTERED) && 299 !pfk->registered) 300 continue; 301 if (broadcast_flags & BROADCAST_ONE) 302 continue; 303 } 304 305 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 306 307 /* Error is cleare after succecful sending to at least one 308 * registered KM */ 309 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 310 err = err2; 311 } 312 pfkey_unlock_table(); 313 314 if (one_sk != NULL) 315 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 316 317 kfree_skb(skb2); 318 kfree_skb(skb); 319 return err; 320 } 321 322 static int pfkey_do_dump(struct pfkey_sock *pfk) 323 { 324 struct sadb_msg *hdr; 325 int rc; 326 327 rc = pfk->dump.dump(pfk); 328 if (rc == -ENOBUFS) 329 return 0; 330 331 if (pfk->dump.skb) { 332 if (!pfkey_can_dump(&pfk->sk)) 333 return 0; 334 335 hdr = (struct sadb_msg *) pfk->dump.skb->data; 336 hdr->sadb_msg_seq = 0; 337 hdr->sadb_msg_errno = rc; 338 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 339 &pfk->sk, sock_net(&pfk->sk)); 340 pfk->dump.skb = NULL; 341 } 342 343 pfkey_terminate_dump(pfk); 344 return rc; 345 } 346 347 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) 348 { 349 *new = *orig; 350 } 351 352 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) 353 { 354 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 355 struct sadb_msg *hdr; 356 357 if (!skb) 358 return -ENOBUFS; 359 360 /* Woe be to the platform trying to support PFKEY yet 361 * having normal errnos outside the 1-255 range, inclusive. 362 */ 363 err = -err; 364 if (err == ERESTARTSYS || 365 err == ERESTARTNOHAND || 366 err == ERESTARTNOINTR) 367 err = EINTR; 368 if (err >= 512) 369 err = EINVAL; 370 BUG_ON(err <= 0 || err >= 256); 371 372 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 373 pfkey_hdr_dup(hdr, orig); 374 hdr->sadb_msg_errno = (uint8_t) err; 375 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 376 sizeof(uint64_t)); 377 378 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 379 380 return 0; 381 } 382 383 static u8 sadb_ext_min_len[] = { 384 [SADB_EXT_RESERVED] = (u8) 0, 385 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 386 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 387 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 388 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 389 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 390 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 391 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 392 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 393 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 394 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 395 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 396 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 397 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 398 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 399 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 400 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 401 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 402 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 403 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 404 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 405 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 406 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 407 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 408 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 409 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 410 }; 411 412 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 413 static int verify_address_len(void *p) 414 { 415 struct sadb_address *sp = p; 416 struct sockaddr *addr = (struct sockaddr *)(sp + 1); 417 struct sockaddr_in *sin; 418 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 419 struct sockaddr_in6 *sin6; 420 #endif 421 int len; 422 423 switch (addr->sa_family) { 424 case AF_INET: 425 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 426 if (sp->sadb_address_len != len || 427 sp->sadb_address_prefixlen > 32) 428 return -EINVAL; 429 break; 430 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 431 case AF_INET6: 432 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 433 if (sp->sadb_address_len != len || 434 sp->sadb_address_prefixlen > 128) 435 return -EINVAL; 436 break; 437 #endif 438 default: 439 /* It is user using kernel to keep track of security 440 * associations for another protocol, such as 441 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 442 * lengths. 443 * 444 * XXX Actually, association/policy database is not yet 445 * XXX able to cope with arbitrary sockaddr families. 446 * XXX When it can, remove this -EINVAL. -DaveM 447 */ 448 return -EINVAL; 449 break; 450 } 451 452 return 0; 453 } 454 455 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) 456 { 457 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 458 sec_ctx->sadb_x_ctx_len, 459 sizeof(uint64_t)); 460 } 461 462 static inline int verify_sec_ctx_len(void *p) 463 { 464 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; 465 int len = sec_ctx->sadb_x_ctx_len; 466 467 if (len > PAGE_SIZE) 468 return -EINVAL; 469 470 len = pfkey_sec_ctx_len(sec_ctx); 471 472 if (sec_ctx->sadb_x_sec_len != len) 473 return -EINVAL; 474 475 return 0; 476 } 477 478 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) 479 { 480 struct xfrm_user_sec_ctx *uctx = NULL; 481 int ctx_size = sec_ctx->sadb_x_ctx_len; 482 483 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); 484 485 if (!uctx) 486 return NULL; 487 488 uctx->len = pfkey_sec_ctx_len(sec_ctx); 489 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 490 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 491 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 492 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 493 memcpy(uctx + 1, sec_ctx + 1, 494 uctx->ctx_len); 495 496 return uctx; 497 } 498 499 static int present_and_same_family(struct sadb_address *src, 500 struct sadb_address *dst) 501 { 502 struct sockaddr *s_addr, *d_addr; 503 504 if (!src || !dst) 505 return 0; 506 507 s_addr = (struct sockaddr *)(src + 1); 508 d_addr = (struct sockaddr *)(dst + 1); 509 if (s_addr->sa_family != d_addr->sa_family) 510 return 0; 511 if (s_addr->sa_family != AF_INET 512 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 513 && s_addr->sa_family != AF_INET6 514 #endif 515 ) 516 return 0; 517 518 return 1; 519 } 520 521 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 522 { 523 char *p = (char *) hdr; 524 int len = skb->len; 525 526 len -= sizeof(*hdr); 527 p += sizeof(*hdr); 528 while (len > 0) { 529 struct sadb_ext *ehdr = (struct sadb_ext *) p; 530 uint16_t ext_type; 531 int ext_len; 532 533 ext_len = ehdr->sadb_ext_len; 534 ext_len *= sizeof(uint64_t); 535 ext_type = ehdr->sadb_ext_type; 536 if (ext_len < sizeof(uint64_t) || 537 ext_len > len || 538 ext_type == SADB_EXT_RESERVED) 539 return -EINVAL; 540 541 if (ext_type <= SADB_EXT_MAX) { 542 int min = (int) sadb_ext_min_len[ext_type]; 543 if (ext_len < min) 544 return -EINVAL; 545 if (ext_hdrs[ext_type-1] != NULL) 546 return -EINVAL; 547 if (ext_type == SADB_EXT_ADDRESS_SRC || 548 ext_type == SADB_EXT_ADDRESS_DST || 549 ext_type == SADB_EXT_ADDRESS_PROXY || 550 ext_type == SADB_X_EXT_NAT_T_OA) { 551 if (verify_address_len(p)) 552 return -EINVAL; 553 } 554 if (ext_type == SADB_X_EXT_SEC_CTX) { 555 if (verify_sec_ctx_len(p)) 556 return -EINVAL; 557 } 558 ext_hdrs[ext_type-1] = p; 559 } 560 p += ext_len; 561 len -= ext_len; 562 } 563 564 return 0; 565 } 566 567 static uint16_t 568 pfkey_satype2proto(uint8_t satype) 569 { 570 switch (satype) { 571 case SADB_SATYPE_UNSPEC: 572 return IPSEC_PROTO_ANY; 573 case SADB_SATYPE_AH: 574 return IPPROTO_AH; 575 case SADB_SATYPE_ESP: 576 return IPPROTO_ESP; 577 case SADB_X_SATYPE_IPCOMP: 578 return IPPROTO_COMP; 579 break; 580 default: 581 return 0; 582 } 583 /* NOTREACHED */ 584 } 585 586 static uint8_t 587 pfkey_proto2satype(uint16_t proto) 588 { 589 switch (proto) { 590 case IPPROTO_AH: 591 return SADB_SATYPE_AH; 592 case IPPROTO_ESP: 593 return SADB_SATYPE_ESP; 594 case IPPROTO_COMP: 595 return SADB_X_SATYPE_IPCOMP; 596 break; 597 default: 598 return 0; 599 } 600 /* NOTREACHED */ 601 } 602 603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 604 * say specifically 'just raw sockets' as we encode them as 255. 605 */ 606 607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 608 { 609 return (proto == IPSEC_PROTO_ANY ? 0 : proto); 610 } 611 612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 613 { 614 return (proto ? proto : IPSEC_PROTO_ANY); 615 } 616 617 static inline int pfkey_sockaddr_len(sa_family_t family) 618 { 619 switch (family) { 620 case AF_INET: 621 return sizeof(struct sockaddr_in); 622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 623 case AF_INET6: 624 return sizeof(struct sockaddr_in6); 625 #endif 626 } 627 return 0; 628 } 629 630 static 631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 632 { 633 switch (sa->sa_family) { 634 case AF_INET: 635 xaddr->a4 = 636 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 637 return AF_INET; 638 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 639 case AF_INET6: 640 memcpy(xaddr->a6, 641 &((struct sockaddr_in6 *)sa)->sin6_addr, 642 sizeof(struct in6_addr)); 643 return AF_INET6; 644 #endif 645 } 646 return 0; 647 } 648 649 static 650 int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr) 651 { 652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 653 xaddr); 654 } 655 656 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, struct sadb_msg *hdr, void **ext_hdrs) 657 { 658 struct sadb_sa *sa; 659 struct sadb_address *addr; 660 uint16_t proto; 661 unsigned short family; 662 xfrm_address_t *xaddr; 663 664 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 665 if (sa == NULL) 666 return NULL; 667 668 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 669 if (proto == 0) 670 return NULL; 671 672 /* sadb_address_len should be checked by caller */ 673 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 674 if (addr == NULL) 675 return NULL; 676 677 family = ((struct sockaddr *)(addr + 1))->sa_family; 678 switch (family) { 679 case AF_INET: 680 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; 681 break; 682 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 683 case AF_INET6: 684 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; 685 break; 686 #endif 687 default: 688 xaddr = NULL; 689 } 690 691 if (!xaddr) 692 return NULL; 693 694 return xfrm_state_lookup(net, xaddr, sa->sadb_sa_spi, proto, family); 695 } 696 697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 698 699 static int 700 pfkey_sockaddr_size(sa_family_t family) 701 { 702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 703 } 704 705 static inline int pfkey_mode_from_xfrm(int mode) 706 { 707 switch(mode) { 708 case XFRM_MODE_TRANSPORT: 709 return IPSEC_MODE_TRANSPORT; 710 case XFRM_MODE_TUNNEL: 711 return IPSEC_MODE_TUNNEL; 712 case XFRM_MODE_BEET: 713 return IPSEC_MODE_BEET; 714 default: 715 return -1; 716 } 717 } 718 719 static inline int pfkey_mode_to_xfrm(int mode) 720 { 721 switch(mode) { 722 case IPSEC_MODE_ANY: /*XXX*/ 723 case IPSEC_MODE_TRANSPORT: 724 return XFRM_MODE_TRANSPORT; 725 case IPSEC_MODE_TUNNEL: 726 return XFRM_MODE_TUNNEL; 727 case IPSEC_MODE_BEET: 728 return XFRM_MODE_BEET; 729 default: 730 return -1; 731 } 732 } 733 734 static unsigned int pfkey_sockaddr_fill(xfrm_address_t *xaddr, __be16 port, 735 struct sockaddr *sa, 736 unsigned short family) 737 { 738 switch (family) { 739 case AF_INET: 740 { 741 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 742 sin->sin_family = AF_INET; 743 sin->sin_port = port; 744 sin->sin_addr.s_addr = xaddr->a4; 745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 746 return 32; 747 } 748 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 749 case AF_INET6: 750 { 751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 752 sin6->sin6_family = AF_INET6; 753 sin6->sin6_port = port; 754 sin6->sin6_flowinfo = 0; 755 ipv6_addr_copy(&sin6->sin6_addr, (struct in6_addr *)xaddr->a6); 756 sin6->sin6_scope_id = 0; 757 return 128; 758 } 759 #endif 760 } 761 return 0; 762 } 763 764 static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x, 765 int add_keys, int hsc) 766 { 767 struct sk_buff *skb; 768 struct sadb_msg *hdr; 769 struct sadb_sa *sa; 770 struct sadb_lifetime *lifetime; 771 struct sadb_address *addr; 772 struct sadb_key *key; 773 struct sadb_x_sa2 *sa2; 774 struct sadb_x_sec_ctx *sec_ctx; 775 struct xfrm_sec_ctx *xfrm_ctx; 776 int ctx_size = 0; 777 int size; 778 int auth_key_size = 0; 779 int encrypt_key_size = 0; 780 int sockaddr_size; 781 struct xfrm_encap_tmpl *natt = NULL; 782 int mode; 783 784 /* address family check */ 785 sockaddr_size = pfkey_sockaddr_size(x->props.family); 786 if (!sockaddr_size) 787 return ERR_PTR(-EINVAL); 788 789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 790 key(AE), (identity(SD),) (sensitivity)> */ 791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 792 sizeof(struct sadb_lifetime) + 793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 795 sizeof(struct sadb_address)*2 + 796 sockaddr_size*2 + 797 sizeof(struct sadb_x_sa2); 798 799 if ((xfrm_ctx = x->security)) { 800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 802 } 803 804 /* identity & sensitivity */ 805 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, x->props.family)) 806 size += sizeof(struct sadb_address) + sockaddr_size; 807 808 if (add_keys) { 809 if (x->aalg && x->aalg->alg_key_len) { 810 auth_key_size = 811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 812 size += sizeof(struct sadb_key) + auth_key_size; 813 } 814 if (x->ealg && x->ealg->alg_key_len) { 815 encrypt_key_size = 816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 817 size += sizeof(struct sadb_key) + encrypt_key_size; 818 } 819 } 820 if (x->encap) 821 natt = x->encap; 822 823 if (natt && natt->encap_type) { 824 size += sizeof(struct sadb_x_nat_t_type); 825 size += sizeof(struct sadb_x_nat_t_port); 826 size += sizeof(struct sadb_x_nat_t_port); 827 } 828 829 skb = alloc_skb(size + 16, GFP_ATOMIC); 830 if (skb == NULL) 831 return ERR_PTR(-ENOBUFS); 832 833 /* call should fill header later */ 834 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 835 memset(hdr, 0, size); /* XXX do we need this ? */ 836 hdr->sadb_msg_len = size / sizeof(uint64_t); 837 838 /* sa */ 839 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 841 sa->sadb_sa_exttype = SADB_EXT_SA; 842 sa->sadb_sa_spi = x->id.spi; 843 sa->sadb_sa_replay = x->props.replay_window; 844 switch (x->km.state) { 845 case XFRM_STATE_VALID: 846 sa->sadb_sa_state = x->km.dying ? 847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 848 break; 849 case XFRM_STATE_ACQ: 850 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 851 break; 852 default: 853 sa->sadb_sa_state = SADB_SASTATE_DEAD; 854 break; 855 } 856 sa->sadb_sa_auth = 0; 857 if (x->aalg) { 858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 859 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; 860 } 861 sa->sadb_sa_encrypt = 0; 862 BUG_ON(x->ealg && x->calg); 863 if (x->ealg) { 864 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 865 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 866 } 867 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 868 if (x->calg) { 869 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 870 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 871 } 872 873 sa->sadb_sa_flags = 0; 874 if (x->props.flags & XFRM_STATE_NOECN) 875 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 876 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 877 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 878 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 879 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 880 881 /* hard time */ 882 if (hsc & 2) { 883 lifetime = (struct sadb_lifetime *) skb_put(skb, 884 sizeof(struct sadb_lifetime)); 885 lifetime->sadb_lifetime_len = 886 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 887 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 888 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 889 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 890 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 891 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 892 } 893 /* soft time */ 894 if (hsc & 1) { 895 lifetime = (struct sadb_lifetime *) skb_put(skb, 896 sizeof(struct sadb_lifetime)); 897 lifetime->sadb_lifetime_len = 898 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 899 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 900 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 901 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 902 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 903 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 904 } 905 /* current time */ 906 lifetime = (struct sadb_lifetime *) skb_put(skb, 907 sizeof(struct sadb_lifetime)); 908 lifetime->sadb_lifetime_len = 909 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 911 lifetime->sadb_lifetime_allocations = x->curlft.packets; 912 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 913 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 914 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 915 /* src address */ 916 addr = (struct sadb_address*) skb_put(skb, 917 sizeof(struct sadb_address)+sockaddr_size); 918 addr->sadb_address_len = 919 (sizeof(struct sadb_address)+sockaddr_size)/ 920 sizeof(uint64_t); 921 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 922 /* "if the ports are non-zero, then the sadb_address_proto field, 923 normally zero, MUST be filled in with the transport 924 protocol's number." - RFC2367 */ 925 addr->sadb_address_proto = 0; 926 addr->sadb_address_reserved = 0; 927 928 addr->sadb_address_prefixlen = 929 pfkey_sockaddr_fill(&x->props.saddr, 0, 930 (struct sockaddr *) (addr + 1), 931 x->props.family); 932 if (!addr->sadb_address_prefixlen) 933 BUG(); 934 935 /* dst address */ 936 addr = (struct sadb_address*) skb_put(skb, 937 sizeof(struct sadb_address)+sockaddr_size); 938 addr->sadb_address_len = 939 (sizeof(struct sadb_address)+sockaddr_size)/ 940 sizeof(uint64_t); 941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 942 addr->sadb_address_proto = 0; 943 addr->sadb_address_reserved = 0; 944 945 addr->sadb_address_prefixlen = 946 pfkey_sockaddr_fill(&x->id.daddr, 0, 947 (struct sockaddr *) (addr + 1), 948 x->props.family); 949 if (!addr->sadb_address_prefixlen) 950 BUG(); 951 952 if (xfrm_addr_cmp(&x->sel.saddr, &x->props.saddr, 953 x->props.family)) { 954 addr = (struct sadb_address*) skb_put(skb, 955 sizeof(struct sadb_address)+sockaddr_size); 956 addr->sadb_address_len = 957 (sizeof(struct sadb_address)+sockaddr_size)/ 958 sizeof(uint64_t); 959 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 960 addr->sadb_address_proto = 961 pfkey_proto_from_xfrm(x->sel.proto); 962 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 963 addr->sadb_address_reserved = 0; 964 965 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 966 (struct sockaddr *) (addr + 1), 967 x->props.family); 968 } 969 970 /* auth key */ 971 if (add_keys && auth_key_size) { 972 key = (struct sadb_key *) skb_put(skb, 973 sizeof(struct sadb_key)+auth_key_size); 974 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 975 sizeof(uint64_t); 976 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 977 key->sadb_key_bits = x->aalg->alg_key_len; 978 key->sadb_key_reserved = 0; 979 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 980 } 981 /* encrypt key */ 982 if (add_keys && encrypt_key_size) { 983 key = (struct sadb_key *) skb_put(skb, 984 sizeof(struct sadb_key)+encrypt_key_size); 985 key->sadb_key_len = (sizeof(struct sadb_key) + 986 encrypt_key_size) / sizeof(uint64_t); 987 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 988 key->sadb_key_bits = x->ealg->alg_key_len; 989 key->sadb_key_reserved = 0; 990 memcpy(key + 1, x->ealg->alg_key, 991 (x->ealg->alg_key_len+7)/8); 992 } 993 994 /* sa */ 995 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 996 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 997 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 998 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 999 kfree_skb(skb); 1000 return ERR_PTR(-EINVAL); 1001 } 1002 sa2->sadb_x_sa2_mode = mode; 1003 sa2->sadb_x_sa2_reserved1 = 0; 1004 sa2->sadb_x_sa2_reserved2 = 0; 1005 sa2->sadb_x_sa2_sequence = 0; 1006 sa2->sadb_x_sa2_reqid = x->props.reqid; 1007 1008 if (natt && natt->encap_type) { 1009 struct sadb_x_nat_t_type *n_type; 1010 struct sadb_x_nat_t_port *n_port; 1011 1012 /* type */ 1013 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 1014 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1015 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1016 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1017 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1018 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1019 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1020 1021 /* source port */ 1022 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1023 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1024 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1025 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1026 n_port->sadb_x_nat_t_port_reserved = 0; 1027 1028 /* dest port */ 1029 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1030 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1031 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1032 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1033 n_port->sadb_x_nat_t_port_reserved = 0; 1034 } 1035 1036 /* security context */ 1037 if (xfrm_ctx) { 1038 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 1039 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1040 sec_ctx->sadb_x_sec_len = 1041 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1042 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1043 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1044 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1045 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1046 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1047 xfrm_ctx->ctx_len); 1048 } 1049 1050 return skb; 1051 } 1052 1053 1054 static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x) 1055 { 1056 struct sk_buff *skb; 1057 1058 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1059 1060 return skb; 1061 } 1062 1063 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x, 1064 int hsc) 1065 { 1066 return __pfkey_xfrm_state2msg(x, 0, hsc); 1067 } 1068 1069 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1070 struct sadb_msg *hdr, 1071 void **ext_hdrs) 1072 { 1073 struct xfrm_state *x; 1074 struct sadb_lifetime *lifetime; 1075 struct sadb_sa *sa; 1076 struct sadb_key *key; 1077 struct sadb_x_sec_ctx *sec_ctx; 1078 uint16_t proto; 1079 int err; 1080 1081 1082 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 1083 if (!sa || 1084 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1085 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1086 return ERR_PTR(-EINVAL); 1087 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1088 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1089 return ERR_PTR(-EINVAL); 1090 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1091 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1092 return ERR_PTR(-EINVAL); 1093 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1094 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1095 return ERR_PTR(-EINVAL); 1096 1097 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1098 if (proto == 0) 1099 return ERR_PTR(-EINVAL); 1100 1101 /* default error is no buffer space */ 1102 err = -ENOBUFS; 1103 1104 /* RFC2367: 1105 1106 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1107 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1108 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1109 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1110 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1111 not true. 1112 1113 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1114 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1115 */ 1116 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1117 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1118 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1119 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1120 return ERR_PTR(-EINVAL); 1121 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1122 if (key != NULL && 1123 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1124 ((key->sadb_key_bits+7) / 8 == 0 || 1125 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1126 return ERR_PTR(-EINVAL); 1127 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1128 if (key != NULL && 1129 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1130 ((key->sadb_key_bits+7) / 8 == 0 || 1131 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1132 return ERR_PTR(-EINVAL); 1133 1134 x = xfrm_state_alloc(net); 1135 if (x == NULL) 1136 return ERR_PTR(-ENOBUFS); 1137 1138 x->id.proto = proto; 1139 x->id.spi = sa->sadb_sa_spi; 1140 x->props.replay_window = sa->sadb_sa_replay; 1141 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1142 x->props.flags |= XFRM_STATE_NOECN; 1143 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1144 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1145 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1146 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1147 1148 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; 1149 if (lifetime != NULL) { 1150 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1151 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1152 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1153 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1154 } 1155 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; 1156 if (lifetime != NULL) { 1157 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1158 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1159 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1160 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1161 } 1162 1163 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 1164 if (sec_ctx != NULL) { 1165 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1166 1167 if (!uctx) 1168 goto out; 1169 1170 err = security_xfrm_state_alloc(x, uctx); 1171 kfree(uctx); 1172 1173 if (err) 1174 goto out; 1175 } 1176 1177 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1178 if (sa->sadb_sa_auth) { 1179 int keysize = 0; 1180 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1181 if (!a) { 1182 err = -ENOSYS; 1183 goto out; 1184 } 1185 if (key) 1186 keysize = (key->sadb_key_bits + 7) / 8; 1187 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1188 if (!x->aalg) 1189 goto out; 1190 strcpy(x->aalg->alg_name, a->name); 1191 x->aalg->alg_key_len = 0; 1192 if (key) { 1193 x->aalg->alg_key_len = key->sadb_key_bits; 1194 memcpy(x->aalg->alg_key, key+1, keysize); 1195 } 1196 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1197 x->props.aalgo = sa->sadb_sa_auth; 1198 /* x->algo.flags = sa->sadb_sa_flags; */ 1199 } 1200 if (sa->sadb_sa_encrypt) { 1201 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1202 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1203 if (!a) { 1204 err = -ENOSYS; 1205 goto out; 1206 } 1207 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1208 if (!x->calg) 1209 goto out; 1210 strcpy(x->calg->alg_name, a->name); 1211 x->props.calgo = sa->sadb_sa_encrypt; 1212 } else { 1213 int keysize = 0; 1214 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1215 if (!a) { 1216 err = -ENOSYS; 1217 goto out; 1218 } 1219 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1220 if (key) 1221 keysize = (key->sadb_key_bits + 7) / 8; 1222 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1223 if (!x->ealg) 1224 goto out; 1225 strcpy(x->ealg->alg_name, a->name); 1226 x->ealg->alg_key_len = 0; 1227 if (key) { 1228 x->ealg->alg_key_len = key->sadb_key_bits; 1229 memcpy(x->ealg->alg_key, key+1, keysize); 1230 } 1231 x->props.ealgo = sa->sadb_sa_encrypt; 1232 } 1233 } 1234 /* x->algo.flags = sa->sadb_sa_flags; */ 1235 1236 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1237 &x->props.saddr); 1238 if (!x->props.family) { 1239 err = -EAFNOSUPPORT; 1240 goto out; 1241 } 1242 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1243 &x->id.daddr); 1244 1245 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1246 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1247 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1248 if (mode < 0) { 1249 err = -EINVAL; 1250 goto out; 1251 } 1252 x->props.mode = mode; 1253 x->props.reqid = sa2->sadb_x_sa2_reqid; 1254 } 1255 1256 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1257 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1258 1259 /* Nobody uses this, but we try. */ 1260 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1261 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1262 } 1263 1264 if (!x->sel.family) 1265 x->sel.family = x->props.family; 1266 1267 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1268 struct sadb_x_nat_t_type* n_type; 1269 struct xfrm_encap_tmpl *natt; 1270 1271 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1272 if (!x->encap) 1273 goto out; 1274 1275 natt = x->encap; 1276 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1277 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1278 1279 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1280 struct sadb_x_nat_t_port* n_port = 1281 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1282 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1283 } 1284 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1285 struct sadb_x_nat_t_port* n_port = 1286 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1287 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1288 } 1289 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1290 } 1291 1292 err = xfrm_init_state(x); 1293 if (err) 1294 goto out; 1295 1296 x->km.seq = hdr->sadb_msg_seq; 1297 return x; 1298 1299 out: 1300 x->km.state = XFRM_STATE_DEAD; 1301 xfrm_state_put(x); 1302 return ERR_PTR(err); 1303 } 1304 1305 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1306 { 1307 return -EOPNOTSUPP; 1308 } 1309 1310 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1311 { 1312 struct net *net = sock_net(sk); 1313 struct sk_buff *resp_skb; 1314 struct sadb_x_sa2 *sa2; 1315 struct sadb_address *saddr, *daddr; 1316 struct sadb_msg *out_hdr; 1317 struct sadb_spirange *range; 1318 struct xfrm_state *x = NULL; 1319 int mode; 1320 int err; 1321 u32 min_spi, max_spi; 1322 u32 reqid; 1323 u8 proto; 1324 unsigned short family; 1325 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1326 1327 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1328 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1329 return -EINVAL; 1330 1331 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1332 if (proto == 0) 1333 return -EINVAL; 1334 1335 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1336 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1337 if (mode < 0) 1338 return -EINVAL; 1339 reqid = sa2->sadb_x_sa2_reqid; 1340 } else { 1341 mode = 0; 1342 reqid = 0; 1343 } 1344 1345 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1346 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1347 1348 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1349 switch (family) { 1350 case AF_INET: 1351 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1352 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1353 break; 1354 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1355 case AF_INET6: 1356 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1357 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1358 break; 1359 #endif 1360 } 1361 1362 if (hdr->sadb_msg_seq) { 1363 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq); 1364 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1365 xfrm_state_put(x); 1366 x = NULL; 1367 } 1368 } 1369 1370 if (!x) 1371 x = xfrm_find_acq(net, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1372 1373 if (x == NULL) 1374 return -ENOENT; 1375 1376 min_spi = 0x100; 1377 max_spi = 0x0fffffff; 1378 1379 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1380 if (range) { 1381 min_spi = range->sadb_spirange_min; 1382 max_spi = range->sadb_spirange_max; 1383 } 1384 1385 err = xfrm_alloc_spi(x, min_spi, max_spi); 1386 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1387 1388 if (IS_ERR(resp_skb)) { 1389 xfrm_state_put(x); 1390 return PTR_ERR(resp_skb); 1391 } 1392 1393 out_hdr = (struct sadb_msg *) resp_skb->data; 1394 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1395 out_hdr->sadb_msg_type = SADB_GETSPI; 1396 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1397 out_hdr->sadb_msg_errno = 0; 1398 out_hdr->sadb_msg_reserved = 0; 1399 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1400 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1401 1402 xfrm_state_put(x); 1403 1404 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1405 1406 return 0; 1407 } 1408 1409 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1410 { 1411 struct net *net = sock_net(sk); 1412 struct xfrm_state *x; 1413 1414 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1415 return -EOPNOTSUPP; 1416 1417 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1418 return 0; 1419 1420 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq); 1421 if (x == NULL) 1422 return 0; 1423 1424 spin_lock_bh(&x->lock); 1425 if (x->km.state == XFRM_STATE_ACQ) { 1426 x->km.state = XFRM_STATE_ERROR; 1427 wake_up(&net->xfrm.km_waitq); 1428 } 1429 spin_unlock_bh(&x->lock); 1430 xfrm_state_put(x); 1431 return 0; 1432 } 1433 1434 static inline int event2poltype(int event) 1435 { 1436 switch (event) { 1437 case XFRM_MSG_DELPOLICY: 1438 return SADB_X_SPDDELETE; 1439 case XFRM_MSG_NEWPOLICY: 1440 return SADB_X_SPDADD; 1441 case XFRM_MSG_UPDPOLICY: 1442 return SADB_X_SPDUPDATE; 1443 case XFRM_MSG_POLEXPIRE: 1444 // return SADB_X_SPDEXPIRE; 1445 default: 1446 printk("pfkey: Unknown policy event %d\n", event); 1447 break; 1448 } 1449 1450 return 0; 1451 } 1452 1453 static inline int event2keytype(int event) 1454 { 1455 switch (event) { 1456 case XFRM_MSG_DELSA: 1457 return SADB_DELETE; 1458 case XFRM_MSG_NEWSA: 1459 return SADB_ADD; 1460 case XFRM_MSG_UPDSA: 1461 return SADB_UPDATE; 1462 case XFRM_MSG_EXPIRE: 1463 return SADB_EXPIRE; 1464 default: 1465 printk("pfkey: Unknown SA event %d\n", event); 1466 break; 1467 } 1468 1469 return 0; 1470 } 1471 1472 /* ADD/UPD/DEL */ 1473 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1474 { 1475 struct sk_buff *skb; 1476 struct sadb_msg *hdr; 1477 1478 skb = pfkey_xfrm_state2msg(x); 1479 1480 if (IS_ERR(skb)) 1481 return PTR_ERR(skb); 1482 1483 hdr = (struct sadb_msg *) skb->data; 1484 hdr->sadb_msg_version = PF_KEY_V2; 1485 hdr->sadb_msg_type = event2keytype(c->event); 1486 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1487 hdr->sadb_msg_errno = 0; 1488 hdr->sadb_msg_reserved = 0; 1489 hdr->sadb_msg_seq = c->seq; 1490 hdr->sadb_msg_pid = c->pid; 1491 1492 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1493 1494 return 0; 1495 } 1496 1497 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1498 { 1499 struct net *net = sock_net(sk); 1500 struct xfrm_state *x; 1501 int err; 1502 struct km_event c; 1503 1504 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1505 if (IS_ERR(x)) 1506 return PTR_ERR(x); 1507 1508 xfrm_state_hold(x); 1509 if (hdr->sadb_msg_type == SADB_ADD) 1510 err = xfrm_state_add(x); 1511 else 1512 err = xfrm_state_update(x); 1513 1514 xfrm_audit_state_add(x, err ? 0 : 1, 1515 audit_get_loginuid(current), 1516 audit_get_sessionid(current), 0); 1517 1518 if (err < 0) { 1519 x->km.state = XFRM_STATE_DEAD; 1520 __xfrm_state_put(x); 1521 goto out; 1522 } 1523 1524 if (hdr->sadb_msg_type == SADB_ADD) 1525 c.event = XFRM_MSG_NEWSA; 1526 else 1527 c.event = XFRM_MSG_UPDSA; 1528 c.seq = hdr->sadb_msg_seq; 1529 c.pid = hdr->sadb_msg_pid; 1530 km_state_notify(x, &c); 1531 out: 1532 xfrm_state_put(x); 1533 return err; 1534 } 1535 1536 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1537 { 1538 struct net *net = sock_net(sk); 1539 struct xfrm_state *x; 1540 struct km_event c; 1541 int err; 1542 1543 if (!ext_hdrs[SADB_EXT_SA-1] || 1544 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1545 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1546 return -EINVAL; 1547 1548 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1549 if (x == NULL) 1550 return -ESRCH; 1551 1552 if ((err = security_xfrm_state_delete(x))) 1553 goto out; 1554 1555 if (xfrm_state_kern(x)) { 1556 err = -EPERM; 1557 goto out; 1558 } 1559 1560 err = xfrm_state_delete(x); 1561 1562 if (err < 0) 1563 goto out; 1564 1565 c.seq = hdr->sadb_msg_seq; 1566 c.pid = hdr->sadb_msg_pid; 1567 c.event = XFRM_MSG_DELSA; 1568 km_state_notify(x, &c); 1569 out: 1570 xfrm_audit_state_delete(x, err ? 0 : 1, 1571 audit_get_loginuid(current), 1572 audit_get_sessionid(current), 0); 1573 xfrm_state_put(x); 1574 1575 return err; 1576 } 1577 1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1579 { 1580 struct net *net = sock_net(sk); 1581 __u8 proto; 1582 struct sk_buff *out_skb; 1583 struct sadb_msg *out_hdr; 1584 struct xfrm_state *x; 1585 1586 if (!ext_hdrs[SADB_EXT_SA-1] || 1587 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1588 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1589 return -EINVAL; 1590 1591 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1592 if (x == NULL) 1593 return -ESRCH; 1594 1595 out_skb = pfkey_xfrm_state2msg(x); 1596 proto = x->id.proto; 1597 xfrm_state_put(x); 1598 if (IS_ERR(out_skb)) 1599 return PTR_ERR(out_skb); 1600 1601 out_hdr = (struct sadb_msg *) out_skb->data; 1602 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1603 out_hdr->sadb_msg_type = SADB_GET; 1604 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1605 out_hdr->sadb_msg_errno = 0; 1606 out_hdr->sadb_msg_reserved = 0; 1607 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1608 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1609 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1610 1611 return 0; 1612 } 1613 1614 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1615 gfp_t allocation) 1616 { 1617 struct sk_buff *skb; 1618 struct sadb_msg *hdr; 1619 int len, auth_len, enc_len, i; 1620 1621 auth_len = xfrm_count_auth_supported(); 1622 if (auth_len) { 1623 auth_len *= sizeof(struct sadb_alg); 1624 auth_len += sizeof(struct sadb_supported); 1625 } 1626 1627 enc_len = xfrm_count_enc_supported(); 1628 if (enc_len) { 1629 enc_len *= sizeof(struct sadb_alg); 1630 enc_len += sizeof(struct sadb_supported); 1631 } 1632 1633 len = enc_len + auth_len + sizeof(struct sadb_msg); 1634 1635 skb = alloc_skb(len + 16, allocation); 1636 if (!skb) 1637 goto out_put_algs; 1638 1639 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1640 pfkey_hdr_dup(hdr, orig); 1641 hdr->sadb_msg_errno = 0; 1642 hdr->sadb_msg_len = len / sizeof(uint64_t); 1643 1644 if (auth_len) { 1645 struct sadb_supported *sp; 1646 struct sadb_alg *ap; 1647 1648 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1649 ap = (struct sadb_alg *) (sp + 1); 1650 1651 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1652 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1653 1654 for (i = 0; ; i++) { 1655 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1656 if (!aalg) 1657 break; 1658 if (aalg->available) 1659 *ap++ = aalg->desc; 1660 } 1661 } 1662 1663 if (enc_len) { 1664 struct sadb_supported *sp; 1665 struct sadb_alg *ap; 1666 1667 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1668 ap = (struct sadb_alg *) (sp + 1); 1669 1670 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1671 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1672 1673 for (i = 0; ; i++) { 1674 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1675 if (!ealg) 1676 break; 1677 if (ealg->available) 1678 *ap++ = ealg->desc; 1679 } 1680 } 1681 1682 out_put_algs: 1683 return skb; 1684 } 1685 1686 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1687 { 1688 struct pfkey_sock *pfk = pfkey_sk(sk); 1689 struct sk_buff *supp_skb; 1690 1691 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1692 return -EINVAL; 1693 1694 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1695 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1696 return -EEXIST; 1697 pfk->registered |= (1<<hdr->sadb_msg_satype); 1698 } 1699 1700 xfrm_probe_algs(); 1701 1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1703 if (!supp_skb) { 1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1705 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1706 1707 return -ENOBUFS; 1708 } 1709 1710 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk)); 1711 1712 return 0; 1713 } 1714 1715 static int key_notify_sa_flush(struct km_event *c) 1716 { 1717 struct sk_buff *skb; 1718 struct sadb_msg *hdr; 1719 1720 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1721 if (!skb) 1722 return -ENOBUFS; 1723 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1724 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1725 hdr->sadb_msg_type = SADB_FLUSH; 1726 hdr->sadb_msg_seq = c->seq; 1727 hdr->sadb_msg_pid = c->pid; 1728 hdr->sadb_msg_version = PF_KEY_V2; 1729 hdr->sadb_msg_errno = (uint8_t) 0; 1730 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1731 1732 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1733 1734 return 0; 1735 } 1736 1737 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1738 { 1739 struct net *net = sock_net(sk); 1740 unsigned proto; 1741 struct km_event c; 1742 struct xfrm_audit audit_info; 1743 int err; 1744 1745 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1746 if (proto == 0) 1747 return -EINVAL; 1748 1749 audit_info.loginuid = audit_get_loginuid(current); 1750 audit_info.sessionid = audit_get_sessionid(current); 1751 audit_info.secid = 0; 1752 err = xfrm_state_flush(net, proto, &audit_info); 1753 if (err) 1754 return err; 1755 c.data.proto = proto; 1756 c.seq = hdr->sadb_msg_seq; 1757 c.pid = hdr->sadb_msg_pid; 1758 c.event = XFRM_MSG_FLUSHSA; 1759 c.net = net; 1760 km_state_notify(NULL, &c); 1761 1762 return 0; 1763 } 1764 1765 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1766 { 1767 struct pfkey_sock *pfk = ptr; 1768 struct sk_buff *out_skb; 1769 struct sadb_msg *out_hdr; 1770 1771 if (!pfkey_can_dump(&pfk->sk)) 1772 return -ENOBUFS; 1773 1774 out_skb = pfkey_xfrm_state2msg(x); 1775 if (IS_ERR(out_skb)) 1776 return PTR_ERR(out_skb); 1777 1778 out_hdr = (struct sadb_msg *) out_skb->data; 1779 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1780 out_hdr->sadb_msg_type = SADB_DUMP; 1781 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1782 out_hdr->sadb_msg_errno = 0; 1783 out_hdr->sadb_msg_reserved = 0; 1784 out_hdr->sadb_msg_seq = count + 1; 1785 out_hdr->sadb_msg_pid = pfk->dump.msg_pid; 1786 1787 if (pfk->dump.skb) 1788 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1789 &pfk->sk, sock_net(&pfk->sk)); 1790 pfk->dump.skb = out_skb; 1791 1792 return 0; 1793 } 1794 1795 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1796 { 1797 struct net *net = sock_net(&pfk->sk); 1798 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1799 } 1800 1801 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1802 { 1803 xfrm_state_walk_done(&pfk->dump.u.state); 1804 } 1805 1806 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1807 { 1808 u8 proto; 1809 struct pfkey_sock *pfk = pfkey_sk(sk); 1810 1811 if (pfk->dump.dump != NULL) 1812 return -EBUSY; 1813 1814 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1815 if (proto == 0) 1816 return -EINVAL; 1817 1818 pfk->dump.msg_version = hdr->sadb_msg_version; 1819 pfk->dump.msg_pid = hdr->sadb_msg_pid; 1820 pfk->dump.dump = pfkey_dump_sa; 1821 pfk->dump.done = pfkey_dump_sa_done; 1822 xfrm_state_walk_init(&pfk->dump.u.state, proto); 1823 1824 return pfkey_do_dump(pfk); 1825 } 1826 1827 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1828 { 1829 struct pfkey_sock *pfk = pfkey_sk(sk); 1830 int satype = hdr->sadb_msg_satype; 1831 1832 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1833 /* XXX we mangle packet... */ 1834 hdr->sadb_msg_errno = 0; 1835 if (satype != 0 && satype != 1) 1836 return -EINVAL; 1837 pfk->promisc = satype; 1838 } 1839 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1840 return 0; 1841 } 1842 1843 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1844 { 1845 int i; 1846 u32 reqid = *(u32*)ptr; 1847 1848 for (i=0; i<xp->xfrm_nr; i++) { 1849 if (xp->xfrm_vec[i].reqid == reqid) 1850 return -EEXIST; 1851 } 1852 return 0; 1853 } 1854 1855 static u32 gen_reqid(struct net *net) 1856 { 1857 struct xfrm_policy_walk walk; 1858 u32 start; 1859 int rc; 1860 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1861 1862 start = reqid; 1863 do { 1864 ++reqid; 1865 if (reqid == 0) 1866 reqid = IPSEC_MANUAL_REQID_MAX+1; 1867 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1868 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1869 xfrm_policy_walk_done(&walk); 1870 if (rc != -EEXIST) 1871 return reqid; 1872 } while (reqid != start); 1873 return 0; 1874 } 1875 1876 static int 1877 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1878 { 1879 struct net *net = xp_net(xp); 1880 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1881 int mode; 1882 1883 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1884 return -ELOOP; 1885 1886 if (rq->sadb_x_ipsecrequest_mode == 0) 1887 return -EINVAL; 1888 1889 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1890 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1891 return -EINVAL; 1892 t->mode = mode; 1893 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1894 t->optional = 1; 1895 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1896 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1897 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1898 t->reqid = 0; 1899 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1900 return -ENOBUFS; 1901 } 1902 1903 /* addresses present only in tunnel mode */ 1904 if (t->mode == XFRM_MODE_TUNNEL) { 1905 u8 *sa = (u8 *) (rq + 1); 1906 int family, socklen; 1907 1908 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1909 &t->saddr); 1910 if (!family) 1911 return -EINVAL; 1912 1913 socklen = pfkey_sockaddr_len(family); 1914 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1915 &t->id.daddr) != family) 1916 return -EINVAL; 1917 t->encap_family = family; 1918 } else 1919 t->encap_family = xp->family; 1920 1921 /* No way to set this via kame pfkey */ 1922 t->allalgs = 1; 1923 xp->xfrm_nr++; 1924 return 0; 1925 } 1926 1927 static int 1928 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1929 { 1930 int err; 1931 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1932 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1933 1934 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1935 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1936 return err; 1937 len -= rq->sadb_x_ipsecrequest_len; 1938 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1939 } 1940 return 0; 1941 } 1942 1943 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1944 { 1945 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1946 1947 if (xfrm_ctx) { 1948 int len = sizeof(struct sadb_x_sec_ctx); 1949 len += xfrm_ctx->ctx_len; 1950 return PFKEY_ALIGN8(len); 1951 } 1952 return 0; 1953 } 1954 1955 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1956 { 1957 struct xfrm_tmpl *t; 1958 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1959 int socklen = 0; 1960 int i; 1961 1962 for (i=0; i<xp->xfrm_nr; i++) { 1963 t = xp->xfrm_vec + i; 1964 socklen += pfkey_sockaddr_len(t->encap_family); 1965 } 1966 1967 return sizeof(struct sadb_msg) + 1968 (sizeof(struct sadb_lifetime) * 3) + 1969 (sizeof(struct sadb_address) * 2) + 1970 (sockaddr_size * 2) + 1971 sizeof(struct sadb_x_policy) + 1972 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1973 (socklen * 2) + 1974 pfkey_xfrm_policy2sec_ctx_size(xp); 1975 } 1976 1977 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1978 { 1979 struct sk_buff *skb; 1980 int size; 1981 1982 size = pfkey_xfrm_policy2msg_size(xp); 1983 1984 skb = alloc_skb(size + 16, GFP_ATOMIC); 1985 if (skb == NULL) 1986 return ERR_PTR(-ENOBUFS); 1987 1988 return skb; 1989 } 1990 1991 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1992 { 1993 struct sadb_msg *hdr; 1994 struct sadb_address *addr; 1995 struct sadb_lifetime *lifetime; 1996 struct sadb_x_policy *pol; 1997 struct sadb_x_sec_ctx *sec_ctx; 1998 struct xfrm_sec_ctx *xfrm_ctx; 1999 int i; 2000 int size; 2001 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2002 int socklen = pfkey_sockaddr_len(xp->family); 2003 2004 size = pfkey_xfrm_policy2msg_size(xp); 2005 2006 /* call should fill header later */ 2007 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2008 memset(hdr, 0, size); /* XXX do we need this ? */ 2009 2010 /* src address */ 2011 addr = (struct sadb_address*) skb_put(skb, 2012 sizeof(struct sadb_address)+sockaddr_size); 2013 addr->sadb_address_len = 2014 (sizeof(struct sadb_address)+sockaddr_size)/ 2015 sizeof(uint64_t); 2016 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2017 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2018 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2019 addr->sadb_address_reserved = 0; 2020 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2021 xp->selector.sport, 2022 (struct sockaddr *) (addr + 1), 2023 xp->family)) 2024 BUG(); 2025 2026 /* dst address */ 2027 addr = (struct sadb_address*) skb_put(skb, 2028 sizeof(struct sadb_address)+sockaddr_size); 2029 addr->sadb_address_len = 2030 (sizeof(struct sadb_address)+sockaddr_size)/ 2031 sizeof(uint64_t); 2032 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2033 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2034 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2035 addr->sadb_address_reserved = 0; 2036 2037 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2038 (struct sockaddr *) (addr + 1), 2039 xp->family); 2040 2041 /* hard time */ 2042 lifetime = (struct sadb_lifetime *) skb_put(skb, 2043 sizeof(struct sadb_lifetime)); 2044 lifetime->sadb_lifetime_len = 2045 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2046 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2047 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2048 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2049 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2050 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2051 /* soft time */ 2052 lifetime = (struct sadb_lifetime *) skb_put(skb, 2053 sizeof(struct sadb_lifetime)); 2054 lifetime->sadb_lifetime_len = 2055 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2056 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2057 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2058 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2059 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2060 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2061 /* current time */ 2062 lifetime = (struct sadb_lifetime *) skb_put(skb, 2063 sizeof(struct sadb_lifetime)); 2064 lifetime->sadb_lifetime_len = 2065 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2066 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2067 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2068 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2069 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2070 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2071 2072 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2073 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2074 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2075 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2076 if (xp->action == XFRM_POLICY_ALLOW) { 2077 if (xp->xfrm_nr) 2078 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2079 else 2080 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2081 } 2082 pol->sadb_x_policy_dir = dir+1; 2083 pol->sadb_x_policy_id = xp->index; 2084 pol->sadb_x_policy_priority = xp->priority; 2085 2086 for (i=0; i<xp->xfrm_nr; i++) { 2087 struct sadb_x_ipsecrequest *rq; 2088 struct xfrm_tmpl *t = xp->xfrm_vec + i; 2089 int req_size; 2090 int mode; 2091 2092 req_size = sizeof(struct sadb_x_ipsecrequest); 2093 if (t->mode == XFRM_MODE_TUNNEL) { 2094 socklen = pfkey_sockaddr_len(t->encap_family); 2095 req_size += socklen * 2; 2096 } else { 2097 size -= 2*socklen; 2098 } 2099 rq = (void*)skb_put(skb, req_size); 2100 pol->sadb_x_policy_len += req_size/8; 2101 memset(rq, 0, sizeof(*rq)); 2102 rq->sadb_x_ipsecrequest_len = req_size; 2103 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2104 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2105 return -EINVAL; 2106 rq->sadb_x_ipsecrequest_mode = mode; 2107 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2108 if (t->reqid) 2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2110 if (t->optional) 2111 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2112 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2113 2114 if (t->mode == XFRM_MODE_TUNNEL) { 2115 u8 *sa = (void *)(rq + 1); 2116 pfkey_sockaddr_fill(&t->saddr, 0, 2117 (struct sockaddr *)sa, 2118 t->encap_family); 2119 pfkey_sockaddr_fill(&t->id.daddr, 0, 2120 (struct sockaddr *) (sa + socklen), 2121 t->encap_family); 2122 } 2123 } 2124 2125 /* security context */ 2126 if ((xfrm_ctx = xp->security)) { 2127 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2128 2129 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2130 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2131 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2132 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2133 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2134 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2135 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2136 xfrm_ctx->ctx_len); 2137 } 2138 2139 hdr->sadb_msg_len = size / sizeof(uint64_t); 2140 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2141 2142 return 0; 2143 } 2144 2145 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2146 { 2147 struct sk_buff *out_skb; 2148 struct sadb_msg *out_hdr; 2149 int err; 2150 2151 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2152 if (IS_ERR(out_skb)) { 2153 err = PTR_ERR(out_skb); 2154 goto out; 2155 } 2156 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2157 if (err < 0) 2158 return err; 2159 2160 out_hdr = (struct sadb_msg *) out_skb->data; 2161 out_hdr->sadb_msg_version = PF_KEY_V2; 2162 2163 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2164 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2165 else 2166 out_hdr->sadb_msg_type = event2poltype(c->event); 2167 out_hdr->sadb_msg_errno = 0; 2168 out_hdr->sadb_msg_seq = c->seq; 2169 out_hdr->sadb_msg_pid = c->pid; 2170 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2171 out: 2172 return 0; 2173 2174 } 2175 2176 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2177 { 2178 struct net *net = sock_net(sk); 2179 int err = 0; 2180 struct sadb_lifetime *lifetime; 2181 struct sadb_address *sa; 2182 struct sadb_x_policy *pol; 2183 struct xfrm_policy *xp; 2184 struct km_event c; 2185 struct sadb_x_sec_ctx *sec_ctx; 2186 2187 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2188 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2189 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2190 return -EINVAL; 2191 2192 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2193 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2194 return -EINVAL; 2195 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2196 return -EINVAL; 2197 2198 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2199 if (xp == NULL) 2200 return -ENOBUFS; 2201 2202 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2203 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2204 xp->priority = pol->sadb_x_policy_priority; 2205 2206 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2207 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2208 if (!xp->family) { 2209 err = -EINVAL; 2210 goto out; 2211 } 2212 xp->selector.family = xp->family; 2213 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2214 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2215 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2216 if (xp->selector.sport) 2217 xp->selector.sport_mask = htons(0xffff); 2218 2219 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2220 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2221 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2222 2223 /* Amusing, we set this twice. KAME apps appear to set same value 2224 * in both addresses. 2225 */ 2226 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2227 2228 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2229 if (xp->selector.dport) 2230 xp->selector.dport_mask = htons(0xffff); 2231 2232 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2233 if (sec_ctx != NULL) { 2234 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2235 2236 if (!uctx) { 2237 err = -ENOBUFS; 2238 goto out; 2239 } 2240 2241 err = security_xfrm_policy_alloc(&xp->security, uctx); 2242 kfree(uctx); 2243 2244 if (err) 2245 goto out; 2246 } 2247 2248 xp->lft.soft_byte_limit = XFRM_INF; 2249 xp->lft.hard_byte_limit = XFRM_INF; 2250 xp->lft.soft_packet_limit = XFRM_INF; 2251 xp->lft.hard_packet_limit = XFRM_INF; 2252 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2253 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2254 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2255 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2256 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2257 } 2258 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2259 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2260 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2261 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2262 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2263 } 2264 xp->xfrm_nr = 0; 2265 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2266 (err = parse_ipsecrequests(xp, pol)) < 0) 2267 goto out; 2268 2269 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2270 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2271 2272 xfrm_audit_policy_add(xp, err ? 0 : 1, 2273 audit_get_loginuid(current), 2274 audit_get_sessionid(current), 0); 2275 2276 if (err) 2277 goto out; 2278 2279 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2280 c.event = XFRM_MSG_UPDPOLICY; 2281 else 2282 c.event = XFRM_MSG_NEWPOLICY; 2283 2284 c.seq = hdr->sadb_msg_seq; 2285 c.pid = hdr->sadb_msg_pid; 2286 2287 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2288 xfrm_pol_put(xp); 2289 return 0; 2290 2291 out: 2292 xp->walk.dead = 1; 2293 xfrm_policy_destroy(xp); 2294 return err; 2295 } 2296 2297 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2298 { 2299 struct net *net = sock_net(sk); 2300 int err; 2301 struct sadb_address *sa; 2302 struct sadb_x_policy *pol; 2303 struct xfrm_policy *xp; 2304 struct xfrm_selector sel; 2305 struct km_event c; 2306 struct sadb_x_sec_ctx *sec_ctx; 2307 struct xfrm_sec_ctx *pol_ctx = NULL; 2308 2309 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2310 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2311 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2312 return -EINVAL; 2313 2314 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2315 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2316 return -EINVAL; 2317 2318 memset(&sel, 0, sizeof(sel)); 2319 2320 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2321 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2322 sel.prefixlen_s = sa->sadb_address_prefixlen; 2323 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2324 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2325 if (sel.sport) 2326 sel.sport_mask = htons(0xffff); 2327 2328 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2329 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2330 sel.prefixlen_d = sa->sadb_address_prefixlen; 2331 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2332 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2333 if (sel.dport) 2334 sel.dport_mask = htons(0xffff); 2335 2336 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2337 if (sec_ctx != NULL) { 2338 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2339 2340 if (!uctx) 2341 return -ENOMEM; 2342 2343 err = security_xfrm_policy_alloc(&pol_ctx, uctx); 2344 kfree(uctx); 2345 if (err) 2346 return err; 2347 } 2348 2349 xp = xfrm_policy_bysel_ctx(net, XFRM_POLICY_TYPE_MAIN, 2350 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2351 1, &err); 2352 security_xfrm_policy_free(pol_ctx); 2353 if (xp == NULL) 2354 return -ENOENT; 2355 2356 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2357 audit_get_loginuid(current), 2358 audit_get_sessionid(current), 0); 2359 2360 if (err) 2361 goto out; 2362 2363 c.seq = hdr->sadb_msg_seq; 2364 c.pid = hdr->sadb_msg_pid; 2365 c.data.byid = 0; 2366 c.event = XFRM_MSG_DELPOLICY; 2367 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2368 2369 out: 2370 xfrm_pol_put(xp); 2371 return err; 2372 } 2373 2374 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2375 { 2376 int err; 2377 struct sk_buff *out_skb; 2378 struct sadb_msg *out_hdr; 2379 err = 0; 2380 2381 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2382 if (IS_ERR(out_skb)) { 2383 err = PTR_ERR(out_skb); 2384 goto out; 2385 } 2386 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2387 if (err < 0) 2388 goto out; 2389 2390 out_hdr = (struct sadb_msg *) out_skb->data; 2391 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2392 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2393 out_hdr->sadb_msg_satype = 0; 2394 out_hdr->sadb_msg_errno = 0; 2395 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2396 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2397 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2398 err = 0; 2399 2400 out: 2401 return err; 2402 } 2403 2404 #ifdef CONFIG_NET_KEY_MIGRATE 2405 static int pfkey_sockaddr_pair_size(sa_family_t family) 2406 { 2407 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2408 } 2409 2410 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2411 xfrm_address_t *saddr, xfrm_address_t *daddr, 2412 u16 *family) 2413 { 2414 int af, socklen; 2415 2416 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2417 return -EINVAL; 2418 2419 af = pfkey_sockaddr_extract(sa, saddr); 2420 if (!af) 2421 return -EINVAL; 2422 2423 socklen = pfkey_sockaddr_len(af); 2424 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2425 daddr) != af) 2426 return -EINVAL; 2427 2428 *family = af; 2429 return 0; 2430 } 2431 2432 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2433 struct xfrm_migrate *m) 2434 { 2435 int err; 2436 struct sadb_x_ipsecrequest *rq2; 2437 int mode; 2438 2439 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2440 len < rq1->sadb_x_ipsecrequest_len) 2441 return -EINVAL; 2442 2443 /* old endoints */ 2444 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2445 rq1->sadb_x_ipsecrequest_len, 2446 &m->old_saddr, &m->old_daddr, 2447 &m->old_family); 2448 if (err) 2449 return err; 2450 2451 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2452 len -= rq1->sadb_x_ipsecrequest_len; 2453 2454 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2455 len < rq2->sadb_x_ipsecrequest_len) 2456 return -EINVAL; 2457 2458 /* new endpoints */ 2459 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2460 rq2->sadb_x_ipsecrequest_len, 2461 &m->new_saddr, &m->new_daddr, 2462 &m->new_family); 2463 if (err) 2464 return err; 2465 2466 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2467 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2468 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2469 return -EINVAL; 2470 2471 m->proto = rq1->sadb_x_ipsecrequest_proto; 2472 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2473 return -EINVAL; 2474 m->mode = mode; 2475 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2476 2477 return ((int)(rq1->sadb_x_ipsecrequest_len + 2478 rq2->sadb_x_ipsecrequest_len)); 2479 } 2480 2481 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2482 struct sadb_msg *hdr, void **ext_hdrs) 2483 { 2484 int i, len, ret, err = -EINVAL; 2485 u8 dir; 2486 struct sadb_address *sa; 2487 struct sadb_x_kmaddress *kma; 2488 struct sadb_x_policy *pol; 2489 struct sadb_x_ipsecrequest *rq; 2490 struct xfrm_selector sel; 2491 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2492 struct xfrm_kmaddress k; 2493 2494 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2495 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2496 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2497 err = -EINVAL; 2498 goto out; 2499 } 2500 2501 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2502 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2503 2504 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2505 err = -EINVAL; 2506 goto out; 2507 } 2508 2509 if (kma) { 2510 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2511 k.reserved = kma->sadb_x_kmaddress_reserved; 2512 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2513 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2514 &k.local, &k.remote, &k.family); 2515 if (ret < 0) { 2516 err = ret; 2517 goto out; 2518 } 2519 } 2520 2521 dir = pol->sadb_x_policy_dir - 1; 2522 memset(&sel, 0, sizeof(sel)); 2523 2524 /* set source address info of selector */ 2525 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2526 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2527 sel.prefixlen_s = sa->sadb_address_prefixlen; 2528 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2529 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2530 if (sel.sport) 2531 sel.sport_mask = htons(0xffff); 2532 2533 /* set destination address info of selector */ 2534 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2535 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2536 sel.prefixlen_d = sa->sadb_address_prefixlen; 2537 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2538 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2539 if (sel.dport) 2540 sel.dport_mask = htons(0xffff); 2541 2542 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2543 2544 /* extract ipsecrequests */ 2545 i = 0; 2546 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2547 2548 while (len > 0 && i < XFRM_MAX_DEPTH) { 2549 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2550 if (ret < 0) { 2551 err = ret; 2552 goto out; 2553 } else { 2554 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2555 len -= ret; 2556 i++; 2557 } 2558 } 2559 2560 if (!i || len > 0) { 2561 err = -EINVAL; 2562 goto out; 2563 } 2564 2565 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2566 kma ? &k : NULL); 2567 2568 out: 2569 return err; 2570 } 2571 #else 2572 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2573 struct sadb_msg *hdr, void **ext_hdrs) 2574 { 2575 return -ENOPROTOOPT; 2576 } 2577 #endif 2578 2579 2580 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2581 { 2582 struct net *net = sock_net(sk); 2583 unsigned int dir; 2584 int err = 0, delete; 2585 struct sadb_x_policy *pol; 2586 struct xfrm_policy *xp; 2587 struct km_event c; 2588 2589 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2590 return -EINVAL; 2591 2592 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2593 if (dir >= XFRM_POLICY_MAX) 2594 return -EINVAL; 2595 2596 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2597 xp = xfrm_policy_byid(net, XFRM_POLICY_TYPE_MAIN, dir, 2598 pol->sadb_x_policy_id, delete, &err); 2599 if (xp == NULL) 2600 return -ENOENT; 2601 2602 if (delete) { 2603 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2604 audit_get_loginuid(current), 2605 audit_get_sessionid(current), 0); 2606 2607 if (err) 2608 goto out; 2609 c.seq = hdr->sadb_msg_seq; 2610 c.pid = hdr->sadb_msg_pid; 2611 c.data.byid = 1; 2612 c.event = XFRM_MSG_DELPOLICY; 2613 km_policy_notify(xp, dir, &c); 2614 } else { 2615 err = key_pol_get_resp(sk, xp, hdr, dir); 2616 } 2617 2618 out: 2619 xfrm_pol_put(xp); 2620 return err; 2621 } 2622 2623 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2624 { 2625 struct pfkey_sock *pfk = ptr; 2626 struct sk_buff *out_skb; 2627 struct sadb_msg *out_hdr; 2628 int err; 2629 2630 if (!pfkey_can_dump(&pfk->sk)) 2631 return -ENOBUFS; 2632 2633 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2634 if (IS_ERR(out_skb)) 2635 return PTR_ERR(out_skb); 2636 2637 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2638 if (err < 0) 2639 return err; 2640 2641 out_hdr = (struct sadb_msg *) out_skb->data; 2642 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2643 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2644 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2645 out_hdr->sadb_msg_errno = 0; 2646 out_hdr->sadb_msg_seq = count + 1; 2647 out_hdr->sadb_msg_pid = pfk->dump.msg_pid; 2648 2649 if (pfk->dump.skb) 2650 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2651 &pfk->sk, sock_net(&pfk->sk)); 2652 pfk->dump.skb = out_skb; 2653 2654 return 0; 2655 } 2656 2657 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2658 { 2659 struct net *net = sock_net(&pfk->sk); 2660 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2661 } 2662 2663 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2664 { 2665 xfrm_policy_walk_done(&pfk->dump.u.policy); 2666 } 2667 2668 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2669 { 2670 struct pfkey_sock *pfk = pfkey_sk(sk); 2671 2672 if (pfk->dump.dump != NULL) 2673 return -EBUSY; 2674 2675 pfk->dump.msg_version = hdr->sadb_msg_version; 2676 pfk->dump.msg_pid = hdr->sadb_msg_pid; 2677 pfk->dump.dump = pfkey_dump_sp; 2678 pfk->dump.done = pfkey_dump_sp_done; 2679 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2680 2681 return pfkey_do_dump(pfk); 2682 } 2683 2684 static int key_notify_policy_flush(struct km_event *c) 2685 { 2686 struct sk_buff *skb_out; 2687 struct sadb_msg *hdr; 2688 2689 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2690 if (!skb_out) 2691 return -ENOBUFS; 2692 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2693 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2694 hdr->sadb_msg_seq = c->seq; 2695 hdr->sadb_msg_pid = c->pid; 2696 hdr->sadb_msg_version = PF_KEY_V2; 2697 hdr->sadb_msg_errno = (uint8_t) 0; 2698 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2699 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2700 return 0; 2701 2702 } 2703 2704 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2705 { 2706 struct net *net = sock_net(sk); 2707 struct km_event c; 2708 struct xfrm_audit audit_info; 2709 int err; 2710 2711 audit_info.loginuid = audit_get_loginuid(current); 2712 audit_info.sessionid = audit_get_sessionid(current); 2713 audit_info.secid = 0; 2714 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); 2715 if (err) 2716 return err; 2717 c.data.type = XFRM_POLICY_TYPE_MAIN; 2718 c.event = XFRM_MSG_FLUSHPOLICY; 2719 c.pid = hdr->sadb_msg_pid; 2720 c.seq = hdr->sadb_msg_seq; 2721 c.net = net; 2722 km_policy_notify(NULL, 0, &c); 2723 2724 return 0; 2725 } 2726 2727 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2728 struct sadb_msg *hdr, void **ext_hdrs); 2729 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2730 [SADB_RESERVED] = pfkey_reserved, 2731 [SADB_GETSPI] = pfkey_getspi, 2732 [SADB_UPDATE] = pfkey_add, 2733 [SADB_ADD] = pfkey_add, 2734 [SADB_DELETE] = pfkey_delete, 2735 [SADB_GET] = pfkey_get, 2736 [SADB_ACQUIRE] = pfkey_acquire, 2737 [SADB_REGISTER] = pfkey_register, 2738 [SADB_EXPIRE] = NULL, 2739 [SADB_FLUSH] = pfkey_flush, 2740 [SADB_DUMP] = pfkey_dump, 2741 [SADB_X_PROMISC] = pfkey_promisc, 2742 [SADB_X_PCHANGE] = NULL, 2743 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2744 [SADB_X_SPDADD] = pfkey_spdadd, 2745 [SADB_X_SPDDELETE] = pfkey_spddelete, 2746 [SADB_X_SPDGET] = pfkey_spdget, 2747 [SADB_X_SPDACQUIRE] = NULL, 2748 [SADB_X_SPDDUMP] = pfkey_spddump, 2749 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2750 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2751 [SADB_X_SPDDELETE2] = pfkey_spdget, 2752 [SADB_X_MIGRATE] = pfkey_migrate, 2753 }; 2754 2755 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2756 { 2757 void *ext_hdrs[SADB_EXT_MAX]; 2758 int err; 2759 2760 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2761 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2762 2763 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2764 err = parse_exthdrs(skb, hdr, ext_hdrs); 2765 if (!err) { 2766 err = -EOPNOTSUPP; 2767 if (pfkey_funcs[hdr->sadb_msg_type]) 2768 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2769 } 2770 return err; 2771 } 2772 2773 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2774 { 2775 struct sadb_msg *hdr = NULL; 2776 2777 if (skb->len < sizeof(*hdr)) { 2778 *errp = -EMSGSIZE; 2779 } else { 2780 hdr = (struct sadb_msg *) skb->data; 2781 if (hdr->sadb_msg_version != PF_KEY_V2 || 2782 hdr->sadb_msg_reserved != 0 || 2783 (hdr->sadb_msg_type <= SADB_RESERVED || 2784 hdr->sadb_msg_type > SADB_MAX)) { 2785 hdr = NULL; 2786 *errp = -EINVAL; 2787 } else if (hdr->sadb_msg_len != (skb->len / 2788 sizeof(uint64_t)) || 2789 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2790 sizeof(uint64_t))) { 2791 hdr = NULL; 2792 *errp = -EMSGSIZE; 2793 } else { 2794 *errp = 0; 2795 } 2796 } 2797 return hdr; 2798 } 2799 2800 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2801 { 2802 unsigned int id = d->desc.sadb_alg_id; 2803 2804 if (id >= sizeof(t->aalgos) * 8) 2805 return 0; 2806 2807 return (t->aalgos >> id) & 1; 2808 } 2809 2810 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2811 { 2812 unsigned int id = d->desc.sadb_alg_id; 2813 2814 if (id >= sizeof(t->ealgos) * 8) 2815 return 0; 2816 2817 return (t->ealgos >> id) & 1; 2818 } 2819 2820 static int count_ah_combs(struct xfrm_tmpl *t) 2821 { 2822 int i, sz = 0; 2823 2824 for (i = 0; ; i++) { 2825 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2826 if (!aalg) 2827 break; 2828 if (aalg_tmpl_set(t, aalg) && aalg->available) 2829 sz += sizeof(struct sadb_comb); 2830 } 2831 return sz + sizeof(struct sadb_prop); 2832 } 2833 2834 static int count_esp_combs(struct xfrm_tmpl *t) 2835 { 2836 int i, k, sz = 0; 2837 2838 for (i = 0; ; i++) { 2839 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2840 if (!ealg) 2841 break; 2842 2843 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2844 continue; 2845 2846 for (k = 1; ; k++) { 2847 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2848 if (!aalg) 2849 break; 2850 2851 if (aalg_tmpl_set(t, aalg) && aalg->available) 2852 sz += sizeof(struct sadb_comb); 2853 } 2854 } 2855 return sz + sizeof(struct sadb_prop); 2856 } 2857 2858 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2859 { 2860 struct sadb_prop *p; 2861 int i; 2862 2863 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2864 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2865 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2866 p->sadb_prop_replay = 32; 2867 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2868 2869 for (i = 0; ; i++) { 2870 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2871 if (!aalg) 2872 break; 2873 2874 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2875 struct sadb_comb *c; 2876 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2877 memset(c, 0, sizeof(*c)); 2878 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2879 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2880 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2881 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2882 c->sadb_comb_hard_addtime = 24*60*60; 2883 c->sadb_comb_soft_addtime = 20*60*60; 2884 c->sadb_comb_hard_usetime = 8*60*60; 2885 c->sadb_comb_soft_usetime = 7*60*60; 2886 } 2887 } 2888 } 2889 2890 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2891 { 2892 struct sadb_prop *p; 2893 int i, k; 2894 2895 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2896 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2897 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2898 p->sadb_prop_replay = 32; 2899 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2900 2901 for (i=0; ; i++) { 2902 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2903 if (!ealg) 2904 break; 2905 2906 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2907 continue; 2908 2909 for (k = 1; ; k++) { 2910 struct sadb_comb *c; 2911 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2912 if (!aalg) 2913 break; 2914 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2915 continue; 2916 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2917 memset(c, 0, sizeof(*c)); 2918 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2919 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2920 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2921 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2922 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2923 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2924 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2925 c->sadb_comb_hard_addtime = 24*60*60; 2926 c->sadb_comb_soft_addtime = 20*60*60; 2927 c->sadb_comb_hard_usetime = 8*60*60; 2928 c->sadb_comb_soft_usetime = 7*60*60; 2929 } 2930 } 2931 } 2932 2933 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2934 { 2935 return 0; 2936 } 2937 2938 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2939 { 2940 struct sk_buff *out_skb; 2941 struct sadb_msg *out_hdr; 2942 int hard; 2943 int hsc; 2944 2945 hard = c->data.hard; 2946 if (hard) 2947 hsc = 2; 2948 else 2949 hsc = 1; 2950 2951 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2952 if (IS_ERR(out_skb)) 2953 return PTR_ERR(out_skb); 2954 2955 out_hdr = (struct sadb_msg *) out_skb->data; 2956 out_hdr->sadb_msg_version = PF_KEY_V2; 2957 out_hdr->sadb_msg_type = SADB_EXPIRE; 2958 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2959 out_hdr->sadb_msg_errno = 0; 2960 out_hdr->sadb_msg_reserved = 0; 2961 out_hdr->sadb_msg_seq = 0; 2962 out_hdr->sadb_msg_pid = 0; 2963 2964 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2965 return 0; 2966 } 2967 2968 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2969 { 2970 struct net *net = x ? xs_net(x) : c->net; 2971 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 2972 2973 if (atomic_read(&net_pfkey->socks_nr) == 0) 2974 return 0; 2975 2976 switch (c->event) { 2977 case XFRM_MSG_EXPIRE: 2978 return key_notify_sa_expire(x, c); 2979 case XFRM_MSG_DELSA: 2980 case XFRM_MSG_NEWSA: 2981 case XFRM_MSG_UPDSA: 2982 return key_notify_sa(x, c); 2983 case XFRM_MSG_FLUSHSA: 2984 return key_notify_sa_flush(c); 2985 case XFRM_MSG_NEWAE: /* not yet supported */ 2986 break; 2987 default: 2988 printk("pfkey: Unknown SA event %d\n", c->event); 2989 break; 2990 } 2991 2992 return 0; 2993 } 2994 2995 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2996 { 2997 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 2998 return 0; 2999 3000 switch (c->event) { 3001 case XFRM_MSG_POLEXPIRE: 3002 return key_notify_policy_expire(xp, c); 3003 case XFRM_MSG_DELPOLICY: 3004 case XFRM_MSG_NEWPOLICY: 3005 case XFRM_MSG_UPDPOLICY: 3006 return key_notify_policy(xp, dir, c); 3007 case XFRM_MSG_FLUSHPOLICY: 3008 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3009 break; 3010 return key_notify_policy_flush(c); 3011 default: 3012 printk("pfkey: Unknown policy event %d\n", c->event); 3013 break; 3014 } 3015 3016 return 0; 3017 } 3018 3019 static u32 get_acqseq(void) 3020 { 3021 u32 res; 3022 static u32 acqseq; 3023 static DEFINE_SPINLOCK(acqseq_lock); 3024 3025 spin_lock_bh(&acqseq_lock); 3026 res = (++acqseq ? : ++acqseq); 3027 spin_unlock_bh(&acqseq_lock); 3028 return res; 3029 } 3030 3031 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 3032 { 3033 struct sk_buff *skb; 3034 struct sadb_msg *hdr; 3035 struct sadb_address *addr; 3036 struct sadb_x_policy *pol; 3037 int sockaddr_size; 3038 int size; 3039 struct sadb_x_sec_ctx *sec_ctx; 3040 struct xfrm_sec_ctx *xfrm_ctx; 3041 int ctx_size = 0; 3042 3043 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3044 if (!sockaddr_size) 3045 return -EINVAL; 3046 3047 size = sizeof(struct sadb_msg) + 3048 (sizeof(struct sadb_address) * 2) + 3049 (sockaddr_size * 2) + 3050 sizeof(struct sadb_x_policy); 3051 3052 if (x->id.proto == IPPROTO_AH) 3053 size += count_ah_combs(t); 3054 else if (x->id.proto == IPPROTO_ESP) 3055 size += count_esp_combs(t); 3056 3057 if ((xfrm_ctx = x->security)) { 3058 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3059 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3060 } 3061 3062 skb = alloc_skb(size + 16, GFP_ATOMIC); 3063 if (skb == NULL) 3064 return -ENOMEM; 3065 3066 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3067 hdr->sadb_msg_version = PF_KEY_V2; 3068 hdr->sadb_msg_type = SADB_ACQUIRE; 3069 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3070 hdr->sadb_msg_len = size / sizeof(uint64_t); 3071 hdr->sadb_msg_errno = 0; 3072 hdr->sadb_msg_reserved = 0; 3073 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3074 hdr->sadb_msg_pid = 0; 3075 3076 /* src address */ 3077 addr = (struct sadb_address*) skb_put(skb, 3078 sizeof(struct sadb_address)+sockaddr_size); 3079 addr->sadb_address_len = 3080 (sizeof(struct sadb_address)+sockaddr_size)/ 3081 sizeof(uint64_t); 3082 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3083 addr->sadb_address_proto = 0; 3084 addr->sadb_address_reserved = 0; 3085 addr->sadb_address_prefixlen = 3086 pfkey_sockaddr_fill(&x->props.saddr, 0, 3087 (struct sockaddr *) (addr + 1), 3088 x->props.family); 3089 if (!addr->sadb_address_prefixlen) 3090 BUG(); 3091 3092 /* dst address */ 3093 addr = (struct sadb_address*) skb_put(skb, 3094 sizeof(struct sadb_address)+sockaddr_size); 3095 addr->sadb_address_len = 3096 (sizeof(struct sadb_address)+sockaddr_size)/ 3097 sizeof(uint64_t); 3098 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3099 addr->sadb_address_proto = 0; 3100 addr->sadb_address_reserved = 0; 3101 addr->sadb_address_prefixlen = 3102 pfkey_sockaddr_fill(&x->id.daddr, 0, 3103 (struct sockaddr *) (addr + 1), 3104 x->props.family); 3105 if (!addr->sadb_address_prefixlen) 3106 BUG(); 3107 3108 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3109 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3110 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3111 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3112 pol->sadb_x_policy_dir = dir+1; 3113 pol->sadb_x_policy_id = xp->index; 3114 3115 /* Set sadb_comb's. */ 3116 if (x->id.proto == IPPROTO_AH) 3117 dump_ah_combs(skb, t); 3118 else if (x->id.proto == IPPROTO_ESP) 3119 dump_esp_combs(skb, t); 3120 3121 /* security context */ 3122 if (xfrm_ctx) { 3123 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3124 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3125 sec_ctx->sadb_x_sec_len = 3126 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3127 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3128 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3129 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3130 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3131 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3132 xfrm_ctx->ctx_len); 3133 } 3134 3135 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3136 } 3137 3138 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3139 u8 *data, int len, int *dir) 3140 { 3141 struct net *net = sock_net(sk); 3142 struct xfrm_policy *xp; 3143 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3144 struct sadb_x_sec_ctx *sec_ctx; 3145 3146 switch (sk->sk_family) { 3147 case AF_INET: 3148 if (opt != IP_IPSEC_POLICY) { 3149 *dir = -EOPNOTSUPP; 3150 return NULL; 3151 } 3152 break; 3153 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3154 case AF_INET6: 3155 if (opt != IPV6_IPSEC_POLICY) { 3156 *dir = -EOPNOTSUPP; 3157 return NULL; 3158 } 3159 break; 3160 #endif 3161 default: 3162 *dir = -EINVAL; 3163 return NULL; 3164 } 3165 3166 *dir = -EINVAL; 3167 3168 if (len < sizeof(struct sadb_x_policy) || 3169 pol->sadb_x_policy_len*8 > len || 3170 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3171 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3172 return NULL; 3173 3174 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3175 if (xp == NULL) { 3176 *dir = -ENOBUFS; 3177 return NULL; 3178 } 3179 3180 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3181 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3182 3183 xp->lft.soft_byte_limit = XFRM_INF; 3184 xp->lft.hard_byte_limit = XFRM_INF; 3185 xp->lft.soft_packet_limit = XFRM_INF; 3186 xp->lft.hard_packet_limit = XFRM_INF; 3187 xp->family = sk->sk_family; 3188 3189 xp->xfrm_nr = 0; 3190 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3191 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3192 goto out; 3193 3194 /* security context too */ 3195 if (len >= (pol->sadb_x_policy_len*8 + 3196 sizeof(struct sadb_x_sec_ctx))) { 3197 char *p = (char *)pol; 3198 struct xfrm_user_sec_ctx *uctx; 3199 3200 p += pol->sadb_x_policy_len*8; 3201 sec_ctx = (struct sadb_x_sec_ctx *)p; 3202 if (len < pol->sadb_x_policy_len*8 + 3203 sec_ctx->sadb_x_sec_len) { 3204 *dir = -EINVAL; 3205 goto out; 3206 } 3207 if ((*dir = verify_sec_ctx_len(p))) 3208 goto out; 3209 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3210 *dir = security_xfrm_policy_alloc(&xp->security, uctx); 3211 kfree(uctx); 3212 3213 if (*dir) 3214 goto out; 3215 } 3216 3217 *dir = pol->sadb_x_policy_dir-1; 3218 return xp; 3219 3220 out: 3221 xp->walk.dead = 1; 3222 xfrm_policy_destroy(xp); 3223 return NULL; 3224 } 3225 3226 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3227 { 3228 struct sk_buff *skb; 3229 struct sadb_msg *hdr; 3230 struct sadb_sa *sa; 3231 struct sadb_address *addr; 3232 struct sadb_x_nat_t_port *n_port; 3233 int sockaddr_size; 3234 int size; 3235 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3236 struct xfrm_encap_tmpl *natt = NULL; 3237 3238 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3239 if (!sockaddr_size) 3240 return -EINVAL; 3241 3242 if (!satype) 3243 return -EINVAL; 3244 3245 if (!x->encap) 3246 return -EINVAL; 3247 3248 natt = x->encap; 3249 3250 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3251 * 3252 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3253 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3254 */ 3255 3256 size = sizeof(struct sadb_msg) + 3257 sizeof(struct sadb_sa) + 3258 (sizeof(struct sadb_address) * 2) + 3259 (sockaddr_size * 2) + 3260 (sizeof(struct sadb_x_nat_t_port) * 2); 3261 3262 skb = alloc_skb(size + 16, GFP_ATOMIC); 3263 if (skb == NULL) 3264 return -ENOMEM; 3265 3266 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3267 hdr->sadb_msg_version = PF_KEY_V2; 3268 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3269 hdr->sadb_msg_satype = satype; 3270 hdr->sadb_msg_len = size / sizeof(uint64_t); 3271 hdr->sadb_msg_errno = 0; 3272 hdr->sadb_msg_reserved = 0; 3273 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3274 hdr->sadb_msg_pid = 0; 3275 3276 /* SA */ 3277 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3278 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3279 sa->sadb_sa_exttype = SADB_EXT_SA; 3280 sa->sadb_sa_spi = x->id.spi; 3281 sa->sadb_sa_replay = 0; 3282 sa->sadb_sa_state = 0; 3283 sa->sadb_sa_auth = 0; 3284 sa->sadb_sa_encrypt = 0; 3285 sa->sadb_sa_flags = 0; 3286 3287 /* ADDRESS_SRC (old addr) */ 3288 addr = (struct sadb_address*) 3289 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3290 addr->sadb_address_len = 3291 (sizeof(struct sadb_address)+sockaddr_size)/ 3292 sizeof(uint64_t); 3293 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3294 addr->sadb_address_proto = 0; 3295 addr->sadb_address_reserved = 0; 3296 addr->sadb_address_prefixlen = 3297 pfkey_sockaddr_fill(&x->props.saddr, 0, 3298 (struct sockaddr *) (addr + 1), 3299 x->props.family); 3300 if (!addr->sadb_address_prefixlen) 3301 BUG(); 3302 3303 /* NAT_T_SPORT (old port) */ 3304 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3305 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3306 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3307 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3308 n_port->sadb_x_nat_t_port_reserved = 0; 3309 3310 /* ADDRESS_DST (new addr) */ 3311 addr = (struct sadb_address*) 3312 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3313 addr->sadb_address_len = 3314 (sizeof(struct sadb_address)+sockaddr_size)/ 3315 sizeof(uint64_t); 3316 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3317 addr->sadb_address_proto = 0; 3318 addr->sadb_address_reserved = 0; 3319 addr->sadb_address_prefixlen = 3320 pfkey_sockaddr_fill(ipaddr, 0, 3321 (struct sockaddr *) (addr + 1), 3322 x->props.family); 3323 if (!addr->sadb_address_prefixlen) 3324 BUG(); 3325 3326 /* NAT_T_DPORT (new port) */ 3327 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3328 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3329 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3330 n_port->sadb_x_nat_t_port_port = sport; 3331 n_port->sadb_x_nat_t_port_reserved = 0; 3332 3333 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3334 } 3335 3336 #ifdef CONFIG_NET_KEY_MIGRATE 3337 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3338 struct xfrm_selector *sel) 3339 { 3340 struct sadb_address *addr; 3341 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3342 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3343 addr->sadb_address_exttype = type; 3344 addr->sadb_address_proto = sel->proto; 3345 addr->sadb_address_reserved = 0; 3346 3347 switch (type) { 3348 case SADB_EXT_ADDRESS_SRC: 3349 addr->sadb_address_prefixlen = sel->prefixlen_s; 3350 pfkey_sockaddr_fill(&sel->saddr, 0, 3351 (struct sockaddr *)(addr + 1), 3352 sel->family); 3353 break; 3354 case SADB_EXT_ADDRESS_DST: 3355 addr->sadb_address_prefixlen = sel->prefixlen_d; 3356 pfkey_sockaddr_fill(&sel->daddr, 0, 3357 (struct sockaddr *)(addr + 1), 3358 sel->family); 3359 break; 3360 default: 3361 return -EINVAL; 3362 } 3363 3364 return 0; 3365 } 3366 3367 3368 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k) 3369 { 3370 struct sadb_x_kmaddress *kma; 3371 u8 *sa; 3372 int family = k->family; 3373 int socklen = pfkey_sockaddr_len(family); 3374 int size_req; 3375 3376 size_req = (sizeof(struct sadb_x_kmaddress) + 3377 pfkey_sockaddr_pair_size(family)); 3378 3379 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3380 memset(kma, 0, size_req); 3381 kma->sadb_x_kmaddress_len = size_req / 8; 3382 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3383 kma->sadb_x_kmaddress_reserved = k->reserved; 3384 3385 sa = (u8 *)(kma + 1); 3386 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3387 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3388 return -EINVAL; 3389 3390 return 0; 3391 } 3392 3393 static int set_ipsecrequest(struct sk_buff *skb, 3394 uint8_t proto, uint8_t mode, int level, 3395 uint32_t reqid, uint8_t family, 3396 xfrm_address_t *src, xfrm_address_t *dst) 3397 { 3398 struct sadb_x_ipsecrequest *rq; 3399 u8 *sa; 3400 int socklen = pfkey_sockaddr_len(family); 3401 int size_req; 3402 3403 size_req = sizeof(struct sadb_x_ipsecrequest) + 3404 pfkey_sockaddr_pair_size(family); 3405 3406 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3407 memset(rq, 0, size_req); 3408 rq->sadb_x_ipsecrequest_len = size_req; 3409 rq->sadb_x_ipsecrequest_proto = proto; 3410 rq->sadb_x_ipsecrequest_mode = mode; 3411 rq->sadb_x_ipsecrequest_level = level; 3412 rq->sadb_x_ipsecrequest_reqid = reqid; 3413 3414 sa = (u8 *) (rq + 1); 3415 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3416 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3417 return -EINVAL; 3418 3419 return 0; 3420 } 3421 #endif 3422 3423 #ifdef CONFIG_NET_KEY_MIGRATE 3424 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3425 struct xfrm_migrate *m, int num_bundles, 3426 struct xfrm_kmaddress *k) 3427 { 3428 int i; 3429 int sasize_sel; 3430 int size = 0; 3431 int size_pol = 0; 3432 struct sk_buff *skb; 3433 struct sadb_msg *hdr; 3434 struct sadb_x_policy *pol; 3435 struct xfrm_migrate *mp; 3436 3437 if (type != XFRM_POLICY_TYPE_MAIN) 3438 return 0; 3439 3440 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3441 return -EINVAL; 3442 3443 if (k != NULL) { 3444 /* addresses for KM */ 3445 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3446 pfkey_sockaddr_pair_size(k->family)); 3447 } 3448 3449 /* selector */ 3450 sasize_sel = pfkey_sockaddr_size(sel->family); 3451 if (!sasize_sel) 3452 return -EINVAL; 3453 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3454 3455 /* policy info */ 3456 size_pol += sizeof(struct sadb_x_policy); 3457 3458 /* ipsecrequests */ 3459 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3460 /* old locator pair */ 3461 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3462 pfkey_sockaddr_pair_size(mp->old_family); 3463 /* new locator pair */ 3464 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3465 pfkey_sockaddr_pair_size(mp->new_family); 3466 } 3467 3468 size += sizeof(struct sadb_msg) + size_pol; 3469 3470 /* alloc buffer */ 3471 skb = alloc_skb(size, GFP_ATOMIC); 3472 if (skb == NULL) 3473 return -ENOMEM; 3474 3475 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3476 hdr->sadb_msg_version = PF_KEY_V2; 3477 hdr->sadb_msg_type = SADB_X_MIGRATE; 3478 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3479 hdr->sadb_msg_len = size / 8; 3480 hdr->sadb_msg_errno = 0; 3481 hdr->sadb_msg_reserved = 0; 3482 hdr->sadb_msg_seq = 0; 3483 hdr->sadb_msg_pid = 0; 3484 3485 /* Addresses to be used by KM for negotiation, if ext is available */ 3486 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3487 return -EINVAL; 3488 3489 /* selector src */ 3490 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3491 3492 /* selector dst */ 3493 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3494 3495 /* policy information */ 3496 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3497 pol->sadb_x_policy_len = size_pol / 8; 3498 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3499 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3500 pol->sadb_x_policy_dir = dir + 1; 3501 pol->sadb_x_policy_id = 0; 3502 pol->sadb_x_policy_priority = 0; 3503 3504 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3505 /* old ipsecrequest */ 3506 int mode = pfkey_mode_from_xfrm(mp->mode); 3507 if (mode < 0) 3508 goto err; 3509 if (set_ipsecrequest(skb, mp->proto, mode, 3510 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3511 mp->reqid, mp->old_family, 3512 &mp->old_saddr, &mp->old_daddr) < 0) 3513 goto err; 3514 3515 /* new ipsecrequest */ 3516 if (set_ipsecrequest(skb, mp->proto, mode, 3517 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3518 mp->reqid, mp->new_family, 3519 &mp->new_saddr, &mp->new_daddr) < 0) 3520 goto err; 3521 } 3522 3523 /* broadcast migrate message to sockets */ 3524 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3525 3526 return 0; 3527 3528 err: 3529 kfree_skb(skb); 3530 return -EINVAL; 3531 } 3532 #else 3533 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3534 struct xfrm_migrate *m, int num_bundles, 3535 struct xfrm_kmaddress *k) 3536 { 3537 return -ENOPROTOOPT; 3538 } 3539 #endif 3540 3541 static int pfkey_sendmsg(struct kiocb *kiocb, 3542 struct socket *sock, struct msghdr *msg, size_t len) 3543 { 3544 struct sock *sk = sock->sk; 3545 struct sk_buff *skb = NULL; 3546 struct sadb_msg *hdr = NULL; 3547 int err; 3548 3549 err = -EOPNOTSUPP; 3550 if (msg->msg_flags & MSG_OOB) 3551 goto out; 3552 3553 err = -EMSGSIZE; 3554 if ((unsigned)len > sk->sk_sndbuf - 32) 3555 goto out; 3556 3557 err = -ENOBUFS; 3558 skb = alloc_skb(len, GFP_KERNEL); 3559 if (skb == NULL) 3560 goto out; 3561 3562 err = -EFAULT; 3563 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3564 goto out; 3565 3566 hdr = pfkey_get_base_msg(skb, &err); 3567 if (!hdr) 3568 goto out; 3569 3570 mutex_lock(&xfrm_cfg_mutex); 3571 err = pfkey_process(sk, skb, hdr); 3572 mutex_unlock(&xfrm_cfg_mutex); 3573 3574 out: 3575 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3576 err = 0; 3577 kfree_skb(skb); 3578 3579 return err ? : len; 3580 } 3581 3582 static int pfkey_recvmsg(struct kiocb *kiocb, 3583 struct socket *sock, struct msghdr *msg, size_t len, 3584 int flags) 3585 { 3586 struct sock *sk = sock->sk; 3587 struct pfkey_sock *pfk = pfkey_sk(sk); 3588 struct sk_buff *skb; 3589 int copied, err; 3590 3591 err = -EINVAL; 3592 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3593 goto out; 3594 3595 msg->msg_namelen = 0; 3596 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3597 if (skb == NULL) 3598 goto out; 3599 3600 copied = skb->len; 3601 if (copied > len) { 3602 msg->msg_flags |= MSG_TRUNC; 3603 copied = len; 3604 } 3605 3606 skb_reset_transport_header(skb); 3607 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3608 if (err) 3609 goto out_free; 3610 3611 sock_recv_ts_and_drops(msg, sk, skb); 3612 3613 err = (flags & MSG_TRUNC) ? skb->len : copied; 3614 3615 if (pfk->dump.dump != NULL && 3616 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3617 pfkey_do_dump(pfk); 3618 3619 out_free: 3620 skb_free_datagram(sk, skb); 3621 out: 3622 return err; 3623 } 3624 3625 static const struct proto_ops pfkey_ops = { 3626 .family = PF_KEY, 3627 .owner = THIS_MODULE, 3628 /* Operations that make no sense on pfkey sockets. */ 3629 .bind = sock_no_bind, 3630 .connect = sock_no_connect, 3631 .socketpair = sock_no_socketpair, 3632 .accept = sock_no_accept, 3633 .getname = sock_no_getname, 3634 .ioctl = sock_no_ioctl, 3635 .listen = sock_no_listen, 3636 .shutdown = sock_no_shutdown, 3637 .setsockopt = sock_no_setsockopt, 3638 .getsockopt = sock_no_getsockopt, 3639 .mmap = sock_no_mmap, 3640 .sendpage = sock_no_sendpage, 3641 3642 /* Now the operations that really occur. */ 3643 .release = pfkey_release, 3644 .poll = datagram_poll, 3645 .sendmsg = pfkey_sendmsg, 3646 .recvmsg = pfkey_recvmsg, 3647 }; 3648 3649 static const struct net_proto_family pfkey_family_ops = { 3650 .family = PF_KEY, 3651 .create = pfkey_create, 3652 .owner = THIS_MODULE, 3653 }; 3654 3655 #ifdef CONFIG_PROC_FS 3656 static int pfkey_seq_show(struct seq_file *f, void *v) 3657 { 3658 struct sock *s; 3659 3660 s = (struct sock *)v; 3661 if (v == SEQ_START_TOKEN) 3662 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3663 else 3664 seq_printf(f ,"%p %-6d %-6u %-6u %-6u %-6lu\n", 3665 s, 3666 atomic_read(&s->sk_refcnt), 3667 sk_rmem_alloc_get(s), 3668 sk_wmem_alloc_get(s), 3669 sock_i_uid(s), 3670 sock_i_ino(s) 3671 ); 3672 return 0; 3673 } 3674 3675 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3676 { 3677 struct net *net = seq_file_net(f); 3678 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3679 struct sock *s; 3680 struct hlist_node *node; 3681 loff_t pos = *ppos; 3682 3683 read_lock(&pfkey_table_lock); 3684 if (pos == 0) 3685 return SEQ_START_TOKEN; 3686 3687 sk_for_each(s, node, &net_pfkey->table) 3688 if (pos-- == 1) 3689 return s; 3690 3691 return NULL; 3692 } 3693 3694 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3695 { 3696 struct net *net = seq_file_net(f); 3697 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3698 3699 ++*ppos; 3700 return (v == SEQ_START_TOKEN) ? 3701 sk_head(&net_pfkey->table) : 3702 sk_next((struct sock *)v); 3703 } 3704 3705 static void pfkey_seq_stop(struct seq_file *f, void *v) 3706 { 3707 read_unlock(&pfkey_table_lock); 3708 } 3709 3710 static const struct seq_operations pfkey_seq_ops = { 3711 .start = pfkey_seq_start, 3712 .next = pfkey_seq_next, 3713 .stop = pfkey_seq_stop, 3714 .show = pfkey_seq_show, 3715 }; 3716 3717 static int pfkey_seq_open(struct inode *inode, struct file *file) 3718 { 3719 return seq_open_net(inode, file, &pfkey_seq_ops, 3720 sizeof(struct seq_net_private)); 3721 } 3722 3723 static const struct file_operations pfkey_proc_ops = { 3724 .open = pfkey_seq_open, 3725 .read = seq_read, 3726 .llseek = seq_lseek, 3727 .release = seq_release_net, 3728 }; 3729 3730 static int __net_init pfkey_init_proc(struct net *net) 3731 { 3732 struct proc_dir_entry *e; 3733 3734 e = proc_net_fops_create(net, "pfkey", 0, &pfkey_proc_ops); 3735 if (e == NULL) 3736 return -ENOMEM; 3737 3738 return 0; 3739 } 3740 3741 static void pfkey_exit_proc(struct net *net) 3742 { 3743 proc_net_remove(net, "pfkey"); 3744 } 3745 #else 3746 static int __net_init pfkey_init_proc(struct net *net) 3747 { 3748 return 0; 3749 } 3750 3751 static void pfkey_exit_proc(struct net *net) 3752 { 3753 } 3754 #endif 3755 3756 static struct xfrm_mgr pfkeyv2_mgr = 3757 { 3758 .id = "pfkeyv2", 3759 .notify = pfkey_send_notify, 3760 .acquire = pfkey_send_acquire, 3761 .compile_policy = pfkey_compile_policy, 3762 .new_mapping = pfkey_send_new_mapping, 3763 .notify_policy = pfkey_send_policy_notify, 3764 .migrate = pfkey_send_migrate, 3765 }; 3766 3767 static int __net_init pfkey_net_init(struct net *net) 3768 { 3769 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3770 int rv; 3771 3772 INIT_HLIST_HEAD(&net_pfkey->table); 3773 atomic_set(&net_pfkey->socks_nr, 0); 3774 3775 rv = pfkey_init_proc(net); 3776 3777 return rv; 3778 } 3779 3780 static void __net_exit pfkey_net_exit(struct net *net) 3781 { 3782 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3783 3784 pfkey_exit_proc(net); 3785 BUG_ON(!hlist_empty(&net_pfkey->table)); 3786 } 3787 3788 static struct pernet_operations pfkey_net_ops = { 3789 .init = pfkey_net_init, 3790 .exit = pfkey_net_exit, 3791 .id = &pfkey_net_id, 3792 .size = sizeof(struct netns_pfkey), 3793 }; 3794 3795 static void __exit ipsec_pfkey_exit(void) 3796 { 3797 unregister_pernet_subsys(&pfkey_net_ops); 3798 xfrm_unregister_km(&pfkeyv2_mgr); 3799 sock_unregister(PF_KEY); 3800 proto_unregister(&key_proto); 3801 } 3802 3803 static int __init ipsec_pfkey_init(void) 3804 { 3805 int err = proto_register(&key_proto, 0); 3806 3807 if (err != 0) 3808 goto out; 3809 3810 err = sock_register(&pfkey_family_ops); 3811 if (err != 0) 3812 goto out_unregister_key_proto; 3813 err = xfrm_register_km(&pfkeyv2_mgr); 3814 if (err != 0) 3815 goto out_sock_unregister; 3816 err = register_pernet_subsys(&pfkey_net_ops); 3817 if (err != 0) 3818 goto out_xfrm_unregister_km; 3819 out: 3820 return err; 3821 out_xfrm_unregister_km: 3822 xfrm_unregister_km(&pfkeyv2_mgr); 3823 out_sock_unregister: 3824 sock_unregister(PF_KEY); 3825 out_unregister_key_proto: 3826 proto_unregister(&key_proto); 3827 goto out; 3828 } 3829 3830 module_init(ipsec_pfkey_init); 3831 module_exit(ipsec_pfkey_exit); 3832 MODULE_LICENSE("GPL"); 3833 MODULE_ALIAS_NETPROTO(PF_KEY); 3834