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; 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 { 182 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 183 struct sock *sk; 184 int err; 185 186 if (!capable(CAP_NET_ADMIN)) 187 return -EPERM; 188 if (sock->type != SOCK_RAW) 189 return -ESOCKTNOSUPPORT; 190 if (protocol != PF_KEY_V2) 191 return -EPROTONOSUPPORT; 192 193 err = -ENOMEM; 194 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto); 195 if (sk == NULL) 196 goto out; 197 198 sock->ops = &pfkey_ops; 199 sock_init_data(sock, sk); 200 201 sk->sk_family = PF_KEY; 202 sk->sk_destruct = pfkey_sock_destruct; 203 204 atomic_inc(&net_pfkey->socks_nr); 205 206 pfkey_insert(sk); 207 208 return 0; 209 out: 210 return err; 211 } 212 213 static int pfkey_release(struct socket *sock) 214 { 215 struct sock *sk = sock->sk; 216 217 if (!sk) 218 return 0; 219 220 pfkey_remove(sk); 221 222 sock_orphan(sk); 223 sock->sk = NULL; 224 skb_queue_purge(&sk->sk_write_queue); 225 sock_put(sk); 226 227 return 0; 228 } 229 230 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 231 gfp_t allocation, struct sock *sk) 232 { 233 int err = -ENOBUFS; 234 235 sock_hold(sk); 236 if (*skb2 == NULL) { 237 if (atomic_read(&skb->users) != 1) { 238 *skb2 = skb_clone(skb, allocation); 239 } else { 240 *skb2 = skb; 241 atomic_inc(&skb->users); 242 } 243 } 244 if (*skb2 != NULL) { 245 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 246 skb_orphan(*skb2); 247 skb_set_owner_r(*skb2, sk); 248 skb_queue_tail(&sk->sk_receive_queue, *skb2); 249 sk->sk_data_ready(sk, (*skb2)->len); 250 *skb2 = NULL; 251 err = 0; 252 } 253 } 254 sock_put(sk); 255 return err; 256 } 257 258 /* Send SKB to all pfkey sockets matching selected criteria. */ 259 #define BROADCAST_ALL 0 260 #define BROADCAST_ONE 1 261 #define BROADCAST_REGISTERED 2 262 #define BROADCAST_PROMISC_ONLY 4 263 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 264 int broadcast_flags, struct sock *one_sk, 265 struct net *net) 266 { 267 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 268 struct sock *sk; 269 struct hlist_node *node; 270 struct sk_buff *skb2 = NULL; 271 int err = -ESRCH; 272 273 /* XXX Do we need something like netlink_overrun? I think 274 * XXX PF_KEY socket apps will not mind current behavior. 275 */ 276 if (!skb) 277 return -ENOMEM; 278 279 pfkey_lock_table(); 280 sk_for_each(sk, node, &net_pfkey->table) { 281 struct pfkey_sock *pfk = pfkey_sk(sk); 282 int err2; 283 284 /* Yes, it means that if you are meant to receive this 285 * pfkey message you receive it twice as promiscuous 286 * socket. 287 */ 288 if (pfk->promisc) 289 pfkey_broadcast_one(skb, &skb2, allocation, sk); 290 291 /* the exact target will be processed later */ 292 if (sk == one_sk) 293 continue; 294 if (broadcast_flags != BROADCAST_ALL) { 295 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 296 continue; 297 if ((broadcast_flags & BROADCAST_REGISTERED) && 298 !pfk->registered) 299 continue; 300 if (broadcast_flags & BROADCAST_ONE) 301 continue; 302 } 303 304 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 305 306 /* Error is cleare after succecful sending to at least one 307 * registered KM */ 308 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 309 err = err2; 310 } 311 pfkey_unlock_table(); 312 313 if (one_sk != NULL) 314 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 315 316 if (skb2) 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->props.aalgo = sa->sadb_sa_auth; 1197 /* x->algo.flags = sa->sadb_sa_flags; */ 1198 } 1199 if (sa->sadb_sa_encrypt) { 1200 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1201 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1202 if (!a) { 1203 err = -ENOSYS; 1204 goto out; 1205 } 1206 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1207 if (!x->calg) 1208 goto out; 1209 strcpy(x->calg->alg_name, a->name); 1210 x->props.calgo = sa->sadb_sa_encrypt; 1211 } else { 1212 int keysize = 0; 1213 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1214 if (!a) { 1215 err = -ENOSYS; 1216 goto out; 1217 } 1218 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1219 if (key) 1220 keysize = (key->sadb_key_bits + 7) / 8; 1221 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1222 if (!x->ealg) 1223 goto out; 1224 strcpy(x->ealg->alg_name, a->name); 1225 x->ealg->alg_key_len = 0; 1226 if (key) { 1227 x->ealg->alg_key_len = key->sadb_key_bits; 1228 memcpy(x->ealg->alg_key, key+1, keysize); 1229 } 1230 x->props.ealgo = sa->sadb_sa_encrypt; 1231 } 1232 } 1233 /* x->algo.flags = sa->sadb_sa_flags; */ 1234 1235 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1236 &x->props.saddr); 1237 if (!x->props.family) { 1238 err = -EAFNOSUPPORT; 1239 goto out; 1240 } 1241 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1242 &x->id.daddr); 1243 1244 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1245 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1246 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1247 if (mode < 0) { 1248 err = -EINVAL; 1249 goto out; 1250 } 1251 x->props.mode = mode; 1252 x->props.reqid = sa2->sadb_x_sa2_reqid; 1253 } 1254 1255 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1256 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1257 1258 /* Nobody uses this, but we try. */ 1259 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1260 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1261 } 1262 1263 if (!x->sel.family) 1264 x->sel.family = x->props.family; 1265 1266 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1267 struct sadb_x_nat_t_type* n_type; 1268 struct xfrm_encap_tmpl *natt; 1269 1270 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1271 if (!x->encap) 1272 goto out; 1273 1274 natt = x->encap; 1275 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1276 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1277 1278 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1279 struct sadb_x_nat_t_port* n_port = 1280 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1281 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1282 } 1283 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1284 struct sadb_x_nat_t_port* n_port = 1285 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1286 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1287 } 1288 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1289 } 1290 1291 err = xfrm_init_state(x); 1292 if (err) 1293 goto out; 1294 1295 x->km.seq = hdr->sadb_msg_seq; 1296 return x; 1297 1298 out: 1299 x->km.state = XFRM_STATE_DEAD; 1300 xfrm_state_put(x); 1301 return ERR_PTR(err); 1302 } 1303 1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1305 { 1306 return -EOPNOTSUPP; 1307 } 1308 1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1310 { 1311 struct net *net = sock_net(sk); 1312 struct sk_buff *resp_skb; 1313 struct sadb_x_sa2 *sa2; 1314 struct sadb_address *saddr, *daddr; 1315 struct sadb_msg *out_hdr; 1316 struct sadb_spirange *range; 1317 struct xfrm_state *x = NULL; 1318 int mode; 1319 int err; 1320 u32 min_spi, max_spi; 1321 u32 reqid; 1322 u8 proto; 1323 unsigned short family; 1324 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1325 1326 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1327 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1328 return -EINVAL; 1329 1330 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1331 if (proto == 0) 1332 return -EINVAL; 1333 1334 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1335 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1336 if (mode < 0) 1337 return -EINVAL; 1338 reqid = sa2->sadb_x_sa2_reqid; 1339 } else { 1340 mode = 0; 1341 reqid = 0; 1342 } 1343 1344 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1345 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1346 1347 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1348 switch (family) { 1349 case AF_INET: 1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1352 break; 1353 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1354 case AF_INET6: 1355 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1356 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1357 break; 1358 #endif 1359 } 1360 1361 if (hdr->sadb_msg_seq) { 1362 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq); 1363 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1364 xfrm_state_put(x); 1365 x = NULL; 1366 } 1367 } 1368 1369 if (!x) 1370 x = xfrm_find_acq(net, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1371 1372 if (x == NULL) 1373 return -ENOENT; 1374 1375 min_spi = 0x100; 1376 max_spi = 0x0fffffff; 1377 1378 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1379 if (range) { 1380 min_spi = range->sadb_spirange_min; 1381 max_spi = range->sadb_spirange_max; 1382 } 1383 1384 err = xfrm_alloc_spi(x, min_spi, max_spi); 1385 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1386 1387 if (IS_ERR(resp_skb)) { 1388 xfrm_state_put(x); 1389 return PTR_ERR(resp_skb); 1390 } 1391 1392 out_hdr = (struct sadb_msg *) resp_skb->data; 1393 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1394 out_hdr->sadb_msg_type = SADB_GETSPI; 1395 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1396 out_hdr->sadb_msg_errno = 0; 1397 out_hdr->sadb_msg_reserved = 0; 1398 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1399 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1400 1401 xfrm_state_put(x); 1402 1403 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1404 1405 return 0; 1406 } 1407 1408 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1409 { 1410 struct net *net = sock_net(sk); 1411 struct xfrm_state *x; 1412 1413 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1414 return -EOPNOTSUPP; 1415 1416 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1417 return 0; 1418 1419 x = xfrm_find_acq_byseq(net, hdr->sadb_msg_seq); 1420 if (x == NULL) 1421 return 0; 1422 1423 spin_lock_bh(&x->lock); 1424 if (x->km.state == XFRM_STATE_ACQ) { 1425 x->km.state = XFRM_STATE_ERROR; 1426 wake_up(&net->xfrm.km_waitq); 1427 } 1428 spin_unlock_bh(&x->lock); 1429 xfrm_state_put(x); 1430 return 0; 1431 } 1432 1433 static inline int event2poltype(int event) 1434 { 1435 switch (event) { 1436 case XFRM_MSG_DELPOLICY: 1437 return SADB_X_SPDDELETE; 1438 case XFRM_MSG_NEWPOLICY: 1439 return SADB_X_SPDADD; 1440 case XFRM_MSG_UPDPOLICY: 1441 return SADB_X_SPDUPDATE; 1442 case XFRM_MSG_POLEXPIRE: 1443 // return SADB_X_SPDEXPIRE; 1444 default: 1445 printk("pfkey: Unknown policy event %d\n", event); 1446 break; 1447 } 1448 1449 return 0; 1450 } 1451 1452 static inline int event2keytype(int event) 1453 { 1454 switch (event) { 1455 case XFRM_MSG_DELSA: 1456 return SADB_DELETE; 1457 case XFRM_MSG_NEWSA: 1458 return SADB_ADD; 1459 case XFRM_MSG_UPDSA: 1460 return SADB_UPDATE; 1461 case XFRM_MSG_EXPIRE: 1462 return SADB_EXPIRE; 1463 default: 1464 printk("pfkey: Unknown SA event %d\n", event); 1465 break; 1466 } 1467 1468 return 0; 1469 } 1470 1471 /* ADD/UPD/DEL */ 1472 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1473 { 1474 struct sk_buff *skb; 1475 struct sadb_msg *hdr; 1476 1477 skb = pfkey_xfrm_state2msg(x); 1478 1479 if (IS_ERR(skb)) 1480 return PTR_ERR(skb); 1481 1482 hdr = (struct sadb_msg *) skb->data; 1483 hdr->sadb_msg_version = PF_KEY_V2; 1484 hdr->sadb_msg_type = event2keytype(c->event); 1485 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1486 hdr->sadb_msg_errno = 0; 1487 hdr->sadb_msg_reserved = 0; 1488 hdr->sadb_msg_seq = c->seq; 1489 hdr->sadb_msg_pid = c->pid; 1490 1491 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1492 1493 return 0; 1494 } 1495 1496 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1497 { 1498 struct net *net = sock_net(sk); 1499 struct xfrm_state *x; 1500 int err; 1501 struct km_event c; 1502 1503 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1504 if (IS_ERR(x)) 1505 return PTR_ERR(x); 1506 1507 xfrm_state_hold(x); 1508 if (hdr->sadb_msg_type == SADB_ADD) 1509 err = xfrm_state_add(x); 1510 else 1511 err = xfrm_state_update(x); 1512 1513 xfrm_audit_state_add(x, err ? 0 : 1, 1514 audit_get_loginuid(current), 1515 audit_get_sessionid(current), 0); 1516 1517 if (err < 0) { 1518 x->km.state = XFRM_STATE_DEAD; 1519 __xfrm_state_put(x); 1520 goto out; 1521 } 1522 1523 if (hdr->sadb_msg_type == SADB_ADD) 1524 c.event = XFRM_MSG_NEWSA; 1525 else 1526 c.event = XFRM_MSG_UPDSA; 1527 c.seq = hdr->sadb_msg_seq; 1528 c.pid = hdr->sadb_msg_pid; 1529 km_state_notify(x, &c); 1530 out: 1531 xfrm_state_put(x); 1532 return err; 1533 } 1534 1535 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1536 { 1537 struct net *net = sock_net(sk); 1538 struct xfrm_state *x; 1539 struct km_event c; 1540 int err; 1541 1542 if (!ext_hdrs[SADB_EXT_SA-1] || 1543 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1544 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1545 return -EINVAL; 1546 1547 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1548 if (x == NULL) 1549 return -ESRCH; 1550 1551 if ((err = security_xfrm_state_delete(x))) 1552 goto out; 1553 1554 if (xfrm_state_kern(x)) { 1555 err = -EPERM; 1556 goto out; 1557 } 1558 1559 err = xfrm_state_delete(x); 1560 1561 if (err < 0) 1562 goto out; 1563 1564 c.seq = hdr->sadb_msg_seq; 1565 c.pid = hdr->sadb_msg_pid; 1566 c.event = XFRM_MSG_DELSA; 1567 km_state_notify(x, &c); 1568 out: 1569 xfrm_audit_state_delete(x, err ? 0 : 1, 1570 audit_get_loginuid(current), 1571 audit_get_sessionid(current), 0); 1572 xfrm_state_put(x); 1573 1574 return err; 1575 } 1576 1577 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1578 { 1579 struct net *net = sock_net(sk); 1580 __u8 proto; 1581 struct sk_buff *out_skb; 1582 struct sadb_msg *out_hdr; 1583 struct xfrm_state *x; 1584 1585 if (!ext_hdrs[SADB_EXT_SA-1] || 1586 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1587 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1588 return -EINVAL; 1589 1590 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1591 if (x == NULL) 1592 return -ESRCH; 1593 1594 out_skb = pfkey_xfrm_state2msg(x); 1595 proto = x->id.proto; 1596 xfrm_state_put(x); 1597 if (IS_ERR(out_skb)) 1598 return PTR_ERR(out_skb); 1599 1600 out_hdr = (struct sadb_msg *) out_skb->data; 1601 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1602 out_hdr->sadb_msg_type = SADB_GET; 1603 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1604 out_hdr->sadb_msg_errno = 0; 1605 out_hdr->sadb_msg_reserved = 0; 1606 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1607 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1608 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1609 1610 return 0; 1611 } 1612 1613 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1614 gfp_t allocation) 1615 { 1616 struct sk_buff *skb; 1617 struct sadb_msg *hdr; 1618 int len, auth_len, enc_len, i; 1619 1620 auth_len = xfrm_count_auth_supported(); 1621 if (auth_len) { 1622 auth_len *= sizeof(struct sadb_alg); 1623 auth_len += sizeof(struct sadb_supported); 1624 } 1625 1626 enc_len = xfrm_count_enc_supported(); 1627 if (enc_len) { 1628 enc_len *= sizeof(struct sadb_alg); 1629 enc_len += sizeof(struct sadb_supported); 1630 } 1631 1632 len = enc_len + auth_len + sizeof(struct sadb_msg); 1633 1634 skb = alloc_skb(len + 16, allocation); 1635 if (!skb) 1636 goto out_put_algs; 1637 1638 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1639 pfkey_hdr_dup(hdr, orig); 1640 hdr->sadb_msg_errno = 0; 1641 hdr->sadb_msg_len = len / sizeof(uint64_t); 1642 1643 if (auth_len) { 1644 struct sadb_supported *sp; 1645 struct sadb_alg *ap; 1646 1647 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1648 ap = (struct sadb_alg *) (sp + 1); 1649 1650 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1651 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1652 1653 for (i = 0; ; i++) { 1654 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1655 if (!aalg) 1656 break; 1657 if (aalg->available) 1658 *ap++ = aalg->desc; 1659 } 1660 } 1661 1662 if (enc_len) { 1663 struct sadb_supported *sp; 1664 struct sadb_alg *ap; 1665 1666 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1667 ap = (struct sadb_alg *) (sp + 1); 1668 1669 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1670 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1671 1672 for (i = 0; ; i++) { 1673 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1674 if (!ealg) 1675 break; 1676 if (ealg->available) 1677 *ap++ = ealg->desc; 1678 } 1679 } 1680 1681 out_put_algs: 1682 return skb; 1683 } 1684 1685 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1686 { 1687 struct pfkey_sock *pfk = pfkey_sk(sk); 1688 struct sk_buff *supp_skb; 1689 1690 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1691 return -EINVAL; 1692 1693 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1694 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1695 return -EEXIST; 1696 pfk->registered |= (1<<hdr->sadb_msg_satype); 1697 } 1698 1699 xfrm_probe_algs(); 1700 1701 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1702 if (!supp_skb) { 1703 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1704 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1705 1706 return -ENOBUFS; 1707 } 1708 1709 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk)); 1710 1711 return 0; 1712 } 1713 1714 static int key_notify_sa_flush(struct km_event *c) 1715 { 1716 struct sk_buff *skb; 1717 struct sadb_msg *hdr; 1718 1719 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1720 if (!skb) 1721 return -ENOBUFS; 1722 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1723 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1724 hdr->sadb_msg_type = SADB_FLUSH; 1725 hdr->sadb_msg_seq = c->seq; 1726 hdr->sadb_msg_pid = c->pid; 1727 hdr->sadb_msg_version = PF_KEY_V2; 1728 hdr->sadb_msg_errno = (uint8_t) 0; 1729 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1730 1731 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1732 1733 return 0; 1734 } 1735 1736 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1737 { 1738 struct net *net = sock_net(sk); 1739 unsigned proto; 1740 struct km_event c; 1741 struct xfrm_audit audit_info; 1742 int err; 1743 1744 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1745 if (proto == 0) 1746 return -EINVAL; 1747 1748 audit_info.loginuid = audit_get_loginuid(current); 1749 audit_info.sessionid = audit_get_sessionid(current); 1750 audit_info.secid = 0; 1751 err = xfrm_state_flush(net, proto, &audit_info); 1752 if (err) 1753 return err; 1754 c.data.proto = proto; 1755 c.seq = hdr->sadb_msg_seq; 1756 c.pid = hdr->sadb_msg_pid; 1757 c.event = XFRM_MSG_FLUSHSA; 1758 c.net = net; 1759 km_state_notify(NULL, &c); 1760 1761 return 0; 1762 } 1763 1764 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1765 { 1766 struct pfkey_sock *pfk = ptr; 1767 struct sk_buff *out_skb; 1768 struct sadb_msg *out_hdr; 1769 1770 if (!pfkey_can_dump(&pfk->sk)) 1771 return -ENOBUFS; 1772 1773 out_skb = pfkey_xfrm_state2msg(x); 1774 if (IS_ERR(out_skb)) 1775 return PTR_ERR(out_skb); 1776 1777 out_hdr = (struct sadb_msg *) out_skb->data; 1778 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1779 out_hdr->sadb_msg_type = SADB_DUMP; 1780 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1781 out_hdr->sadb_msg_errno = 0; 1782 out_hdr->sadb_msg_reserved = 0; 1783 out_hdr->sadb_msg_seq = count + 1; 1784 out_hdr->sadb_msg_pid = pfk->dump.msg_pid; 1785 1786 if (pfk->dump.skb) 1787 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1788 &pfk->sk, sock_net(&pfk->sk)); 1789 pfk->dump.skb = out_skb; 1790 1791 return 0; 1792 } 1793 1794 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1795 { 1796 struct net *net = sock_net(&pfk->sk); 1797 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1798 } 1799 1800 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1801 { 1802 xfrm_state_walk_done(&pfk->dump.u.state); 1803 } 1804 1805 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1806 { 1807 u8 proto; 1808 struct pfkey_sock *pfk = pfkey_sk(sk); 1809 1810 if (pfk->dump.dump != NULL) 1811 return -EBUSY; 1812 1813 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1814 if (proto == 0) 1815 return -EINVAL; 1816 1817 pfk->dump.msg_version = hdr->sadb_msg_version; 1818 pfk->dump.msg_pid = hdr->sadb_msg_pid; 1819 pfk->dump.dump = pfkey_dump_sa; 1820 pfk->dump.done = pfkey_dump_sa_done; 1821 xfrm_state_walk_init(&pfk->dump.u.state, proto); 1822 1823 return pfkey_do_dump(pfk); 1824 } 1825 1826 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1827 { 1828 struct pfkey_sock *pfk = pfkey_sk(sk); 1829 int satype = hdr->sadb_msg_satype; 1830 1831 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1832 /* XXX we mangle packet... */ 1833 hdr->sadb_msg_errno = 0; 1834 if (satype != 0 && satype != 1) 1835 return -EINVAL; 1836 pfk->promisc = satype; 1837 } 1838 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1839 return 0; 1840 } 1841 1842 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1843 { 1844 int i; 1845 u32 reqid = *(u32*)ptr; 1846 1847 for (i=0; i<xp->xfrm_nr; i++) { 1848 if (xp->xfrm_vec[i].reqid == reqid) 1849 return -EEXIST; 1850 } 1851 return 0; 1852 } 1853 1854 static u32 gen_reqid(struct net *net) 1855 { 1856 struct xfrm_policy_walk walk; 1857 u32 start; 1858 int rc; 1859 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1860 1861 start = reqid; 1862 do { 1863 ++reqid; 1864 if (reqid == 0) 1865 reqid = IPSEC_MANUAL_REQID_MAX+1; 1866 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1867 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1868 xfrm_policy_walk_done(&walk); 1869 if (rc != -EEXIST) 1870 return reqid; 1871 } while (reqid != start); 1872 return 0; 1873 } 1874 1875 static int 1876 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1877 { 1878 struct net *net = xp_net(xp); 1879 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1880 int mode; 1881 1882 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1883 return -ELOOP; 1884 1885 if (rq->sadb_x_ipsecrequest_mode == 0) 1886 return -EINVAL; 1887 1888 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1889 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1890 return -EINVAL; 1891 t->mode = mode; 1892 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1893 t->optional = 1; 1894 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1895 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1896 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1897 t->reqid = 0; 1898 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1899 return -ENOBUFS; 1900 } 1901 1902 /* addresses present only in tunnel mode */ 1903 if (t->mode == XFRM_MODE_TUNNEL) { 1904 u8 *sa = (u8 *) (rq + 1); 1905 int family, socklen; 1906 1907 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1908 &t->saddr); 1909 if (!family) 1910 return -EINVAL; 1911 1912 socklen = pfkey_sockaddr_len(family); 1913 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1914 &t->id.daddr) != family) 1915 return -EINVAL; 1916 t->encap_family = family; 1917 } else 1918 t->encap_family = xp->family; 1919 1920 /* No way to set this via kame pfkey */ 1921 t->allalgs = 1; 1922 xp->xfrm_nr++; 1923 return 0; 1924 } 1925 1926 static int 1927 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1928 { 1929 int err; 1930 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1931 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1932 1933 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1934 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1935 return err; 1936 len -= rq->sadb_x_ipsecrequest_len; 1937 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1938 } 1939 return 0; 1940 } 1941 1942 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1943 { 1944 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1945 1946 if (xfrm_ctx) { 1947 int len = sizeof(struct sadb_x_sec_ctx); 1948 len += xfrm_ctx->ctx_len; 1949 return PFKEY_ALIGN8(len); 1950 } 1951 return 0; 1952 } 1953 1954 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1955 { 1956 struct xfrm_tmpl *t; 1957 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1958 int socklen = 0; 1959 int i; 1960 1961 for (i=0; i<xp->xfrm_nr; i++) { 1962 t = xp->xfrm_vec + i; 1963 socklen += pfkey_sockaddr_len(t->encap_family); 1964 } 1965 1966 return sizeof(struct sadb_msg) + 1967 (sizeof(struct sadb_lifetime) * 3) + 1968 (sizeof(struct sadb_address) * 2) + 1969 (sockaddr_size * 2) + 1970 sizeof(struct sadb_x_policy) + 1971 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1972 (socklen * 2) + 1973 pfkey_xfrm_policy2sec_ctx_size(xp); 1974 } 1975 1976 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1977 { 1978 struct sk_buff *skb; 1979 int size; 1980 1981 size = pfkey_xfrm_policy2msg_size(xp); 1982 1983 skb = alloc_skb(size + 16, GFP_ATOMIC); 1984 if (skb == NULL) 1985 return ERR_PTR(-ENOBUFS); 1986 1987 return skb; 1988 } 1989 1990 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1991 { 1992 struct sadb_msg *hdr; 1993 struct sadb_address *addr; 1994 struct sadb_lifetime *lifetime; 1995 struct sadb_x_policy *pol; 1996 struct sadb_x_sec_ctx *sec_ctx; 1997 struct xfrm_sec_ctx *xfrm_ctx; 1998 int i; 1999 int size; 2000 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2001 int socklen = pfkey_sockaddr_len(xp->family); 2002 2003 size = pfkey_xfrm_policy2msg_size(xp); 2004 2005 /* call should fill header later */ 2006 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2007 memset(hdr, 0, size); /* XXX do we need this ? */ 2008 2009 /* src address */ 2010 addr = (struct sadb_address*) skb_put(skb, 2011 sizeof(struct sadb_address)+sockaddr_size); 2012 addr->sadb_address_len = 2013 (sizeof(struct sadb_address)+sockaddr_size)/ 2014 sizeof(uint64_t); 2015 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2016 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2017 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2018 addr->sadb_address_reserved = 0; 2019 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2020 xp->selector.sport, 2021 (struct sockaddr *) (addr + 1), 2022 xp->family)) 2023 BUG(); 2024 2025 /* dst address */ 2026 addr = (struct sadb_address*) skb_put(skb, 2027 sizeof(struct sadb_address)+sockaddr_size); 2028 addr->sadb_address_len = 2029 (sizeof(struct sadb_address)+sockaddr_size)/ 2030 sizeof(uint64_t); 2031 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2032 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2033 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2034 addr->sadb_address_reserved = 0; 2035 2036 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2037 (struct sockaddr *) (addr + 1), 2038 xp->family); 2039 2040 /* hard time */ 2041 lifetime = (struct sadb_lifetime *) skb_put(skb, 2042 sizeof(struct sadb_lifetime)); 2043 lifetime->sadb_lifetime_len = 2044 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2045 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2046 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2047 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2048 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2049 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2050 /* soft time */ 2051 lifetime = (struct sadb_lifetime *) skb_put(skb, 2052 sizeof(struct sadb_lifetime)); 2053 lifetime->sadb_lifetime_len = 2054 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2055 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2056 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2057 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2058 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2059 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2060 /* current time */ 2061 lifetime = (struct sadb_lifetime *) skb_put(skb, 2062 sizeof(struct sadb_lifetime)); 2063 lifetime->sadb_lifetime_len = 2064 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2065 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2066 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2067 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2068 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2069 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2070 2071 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2072 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2073 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2074 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2075 if (xp->action == XFRM_POLICY_ALLOW) { 2076 if (xp->xfrm_nr) 2077 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2078 else 2079 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2080 } 2081 pol->sadb_x_policy_dir = dir+1; 2082 pol->sadb_x_policy_id = xp->index; 2083 pol->sadb_x_policy_priority = xp->priority; 2084 2085 for (i=0; i<xp->xfrm_nr; i++) { 2086 struct sadb_x_ipsecrequest *rq; 2087 struct xfrm_tmpl *t = xp->xfrm_vec + i; 2088 int req_size; 2089 int mode; 2090 2091 req_size = sizeof(struct sadb_x_ipsecrequest); 2092 if (t->mode == XFRM_MODE_TUNNEL) { 2093 socklen = pfkey_sockaddr_len(t->encap_family); 2094 req_size += socklen * 2; 2095 } else { 2096 size -= 2*socklen; 2097 } 2098 rq = (void*)skb_put(skb, req_size); 2099 pol->sadb_x_policy_len += req_size/8; 2100 memset(rq, 0, sizeof(*rq)); 2101 rq->sadb_x_ipsecrequest_len = req_size; 2102 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2103 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2104 return -EINVAL; 2105 rq->sadb_x_ipsecrequest_mode = mode; 2106 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2107 if (t->reqid) 2108 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2109 if (t->optional) 2110 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2111 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2112 2113 if (t->mode == XFRM_MODE_TUNNEL) { 2114 u8 *sa = (void *)(rq + 1); 2115 pfkey_sockaddr_fill(&t->saddr, 0, 2116 (struct sockaddr *)sa, 2117 t->encap_family); 2118 pfkey_sockaddr_fill(&t->id.daddr, 0, 2119 (struct sockaddr *) (sa + socklen), 2120 t->encap_family); 2121 } 2122 } 2123 2124 /* security context */ 2125 if ((xfrm_ctx = xp->security)) { 2126 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2127 2128 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2129 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2130 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2131 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2132 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2133 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2134 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2135 xfrm_ctx->ctx_len); 2136 } 2137 2138 hdr->sadb_msg_len = size / sizeof(uint64_t); 2139 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2140 2141 return 0; 2142 } 2143 2144 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2145 { 2146 struct sk_buff *out_skb; 2147 struct sadb_msg *out_hdr; 2148 int err; 2149 2150 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2151 if (IS_ERR(out_skb)) { 2152 err = PTR_ERR(out_skb); 2153 goto out; 2154 } 2155 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2156 if (err < 0) 2157 return err; 2158 2159 out_hdr = (struct sadb_msg *) out_skb->data; 2160 out_hdr->sadb_msg_version = PF_KEY_V2; 2161 2162 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2163 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2164 else 2165 out_hdr->sadb_msg_type = event2poltype(c->event); 2166 out_hdr->sadb_msg_errno = 0; 2167 out_hdr->sadb_msg_seq = c->seq; 2168 out_hdr->sadb_msg_pid = c->pid; 2169 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2170 out: 2171 return 0; 2172 2173 } 2174 2175 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2176 { 2177 struct net *net = sock_net(sk); 2178 int err = 0; 2179 struct sadb_lifetime *lifetime; 2180 struct sadb_address *sa; 2181 struct sadb_x_policy *pol; 2182 struct xfrm_policy *xp; 2183 struct km_event c; 2184 struct sadb_x_sec_ctx *sec_ctx; 2185 2186 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2187 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2188 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2189 return -EINVAL; 2190 2191 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2192 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2193 return -EINVAL; 2194 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2195 return -EINVAL; 2196 2197 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2198 if (xp == NULL) 2199 return -ENOBUFS; 2200 2201 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2202 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2203 xp->priority = pol->sadb_x_policy_priority; 2204 2205 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2206 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2207 if (!xp->family) { 2208 err = -EINVAL; 2209 goto out; 2210 } 2211 xp->selector.family = xp->family; 2212 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2213 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2214 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2215 if (xp->selector.sport) 2216 xp->selector.sport_mask = htons(0xffff); 2217 2218 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2219 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2220 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2221 2222 /* Amusing, we set this twice. KAME apps appear to set same value 2223 * in both addresses. 2224 */ 2225 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2226 2227 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2228 if (xp->selector.dport) 2229 xp->selector.dport_mask = htons(0xffff); 2230 2231 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2232 if (sec_ctx != NULL) { 2233 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2234 2235 if (!uctx) { 2236 err = -ENOBUFS; 2237 goto out; 2238 } 2239 2240 err = security_xfrm_policy_alloc(&xp->security, uctx); 2241 kfree(uctx); 2242 2243 if (err) 2244 goto out; 2245 } 2246 2247 xp->lft.soft_byte_limit = XFRM_INF; 2248 xp->lft.hard_byte_limit = XFRM_INF; 2249 xp->lft.soft_packet_limit = XFRM_INF; 2250 xp->lft.hard_packet_limit = XFRM_INF; 2251 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2252 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2253 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2254 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2255 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2256 } 2257 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2258 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2259 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2260 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2261 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2262 } 2263 xp->xfrm_nr = 0; 2264 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2265 (err = parse_ipsecrequests(xp, pol)) < 0) 2266 goto out; 2267 2268 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2269 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2270 2271 xfrm_audit_policy_add(xp, err ? 0 : 1, 2272 audit_get_loginuid(current), 2273 audit_get_sessionid(current), 0); 2274 2275 if (err) 2276 goto out; 2277 2278 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2279 c.event = XFRM_MSG_UPDPOLICY; 2280 else 2281 c.event = XFRM_MSG_NEWPOLICY; 2282 2283 c.seq = hdr->sadb_msg_seq; 2284 c.pid = hdr->sadb_msg_pid; 2285 2286 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2287 xfrm_pol_put(xp); 2288 return 0; 2289 2290 out: 2291 xp->walk.dead = 1; 2292 xfrm_policy_destroy(xp); 2293 return err; 2294 } 2295 2296 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2297 { 2298 struct net *net = sock_net(sk); 2299 int err; 2300 struct sadb_address *sa; 2301 struct sadb_x_policy *pol; 2302 struct xfrm_policy *xp; 2303 struct xfrm_selector sel; 2304 struct km_event c; 2305 struct sadb_x_sec_ctx *sec_ctx; 2306 struct xfrm_sec_ctx *pol_ctx = NULL; 2307 2308 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2309 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2310 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2311 return -EINVAL; 2312 2313 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2314 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2315 return -EINVAL; 2316 2317 memset(&sel, 0, sizeof(sel)); 2318 2319 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2320 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2321 sel.prefixlen_s = sa->sadb_address_prefixlen; 2322 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2323 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2324 if (sel.sport) 2325 sel.sport_mask = htons(0xffff); 2326 2327 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2328 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2329 sel.prefixlen_d = sa->sadb_address_prefixlen; 2330 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2331 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2332 if (sel.dport) 2333 sel.dport_mask = htons(0xffff); 2334 2335 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2336 if (sec_ctx != NULL) { 2337 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2338 2339 if (!uctx) 2340 return -ENOMEM; 2341 2342 err = security_xfrm_policy_alloc(&pol_ctx, uctx); 2343 kfree(uctx); 2344 if (err) 2345 return err; 2346 } 2347 2348 xp = xfrm_policy_bysel_ctx(net, XFRM_POLICY_TYPE_MAIN, 2349 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2350 1, &err); 2351 security_xfrm_policy_free(pol_ctx); 2352 if (xp == NULL) 2353 return -ENOENT; 2354 2355 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2356 audit_get_loginuid(current), 2357 audit_get_sessionid(current), 0); 2358 2359 if (err) 2360 goto out; 2361 2362 c.seq = hdr->sadb_msg_seq; 2363 c.pid = hdr->sadb_msg_pid; 2364 c.data.byid = 0; 2365 c.event = XFRM_MSG_DELPOLICY; 2366 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2367 2368 out: 2369 xfrm_pol_put(xp); 2370 return err; 2371 } 2372 2373 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2374 { 2375 int err; 2376 struct sk_buff *out_skb; 2377 struct sadb_msg *out_hdr; 2378 err = 0; 2379 2380 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2381 if (IS_ERR(out_skb)) { 2382 err = PTR_ERR(out_skb); 2383 goto out; 2384 } 2385 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2386 if (err < 0) 2387 goto out; 2388 2389 out_hdr = (struct sadb_msg *) out_skb->data; 2390 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2391 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2392 out_hdr->sadb_msg_satype = 0; 2393 out_hdr->sadb_msg_errno = 0; 2394 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2395 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2396 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2397 err = 0; 2398 2399 out: 2400 return err; 2401 } 2402 2403 #ifdef CONFIG_NET_KEY_MIGRATE 2404 static int pfkey_sockaddr_pair_size(sa_family_t family) 2405 { 2406 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2407 } 2408 2409 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2410 xfrm_address_t *saddr, xfrm_address_t *daddr, 2411 u16 *family) 2412 { 2413 int af, socklen; 2414 2415 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2416 return -EINVAL; 2417 2418 af = pfkey_sockaddr_extract(sa, saddr); 2419 if (!af) 2420 return -EINVAL; 2421 2422 socklen = pfkey_sockaddr_len(af); 2423 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2424 daddr) != af) 2425 return -EINVAL; 2426 2427 *family = af; 2428 return 0; 2429 } 2430 2431 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2432 struct xfrm_migrate *m) 2433 { 2434 int err; 2435 struct sadb_x_ipsecrequest *rq2; 2436 int mode; 2437 2438 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2439 len < rq1->sadb_x_ipsecrequest_len) 2440 return -EINVAL; 2441 2442 /* old endoints */ 2443 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2444 rq1->sadb_x_ipsecrequest_len, 2445 &m->old_saddr, &m->old_daddr, 2446 &m->old_family); 2447 if (err) 2448 return err; 2449 2450 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2451 len -= rq1->sadb_x_ipsecrequest_len; 2452 2453 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2454 len < rq2->sadb_x_ipsecrequest_len) 2455 return -EINVAL; 2456 2457 /* new endpoints */ 2458 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2459 rq2->sadb_x_ipsecrequest_len, 2460 &m->new_saddr, &m->new_daddr, 2461 &m->new_family); 2462 if (err) 2463 return err; 2464 2465 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2466 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2467 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2468 return -EINVAL; 2469 2470 m->proto = rq1->sadb_x_ipsecrequest_proto; 2471 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2472 return -EINVAL; 2473 m->mode = mode; 2474 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2475 2476 return ((int)(rq1->sadb_x_ipsecrequest_len + 2477 rq2->sadb_x_ipsecrequest_len)); 2478 } 2479 2480 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2481 struct sadb_msg *hdr, void **ext_hdrs) 2482 { 2483 int i, len, ret, err = -EINVAL; 2484 u8 dir; 2485 struct sadb_address *sa; 2486 struct sadb_x_kmaddress *kma; 2487 struct sadb_x_policy *pol; 2488 struct sadb_x_ipsecrequest *rq; 2489 struct xfrm_selector sel; 2490 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2491 struct xfrm_kmaddress k; 2492 2493 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2494 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2495 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2496 err = -EINVAL; 2497 goto out; 2498 } 2499 2500 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2501 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2502 2503 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2504 err = -EINVAL; 2505 goto out; 2506 } 2507 2508 if (kma) { 2509 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2510 k.reserved = kma->sadb_x_kmaddress_reserved; 2511 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2512 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2513 &k.local, &k.remote, &k.family); 2514 if (ret < 0) { 2515 err = ret; 2516 goto out; 2517 } 2518 } 2519 2520 dir = pol->sadb_x_policy_dir - 1; 2521 memset(&sel, 0, sizeof(sel)); 2522 2523 /* set source address info of selector */ 2524 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2525 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2526 sel.prefixlen_s = sa->sadb_address_prefixlen; 2527 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2528 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2529 if (sel.sport) 2530 sel.sport_mask = htons(0xffff); 2531 2532 /* set destination address info of selector */ 2533 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2534 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2535 sel.prefixlen_d = sa->sadb_address_prefixlen; 2536 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2537 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2538 if (sel.dport) 2539 sel.dport_mask = htons(0xffff); 2540 2541 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2542 2543 /* extract ipsecrequests */ 2544 i = 0; 2545 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2546 2547 while (len > 0 && i < XFRM_MAX_DEPTH) { 2548 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2549 if (ret < 0) { 2550 err = ret; 2551 goto out; 2552 } else { 2553 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2554 len -= ret; 2555 i++; 2556 } 2557 } 2558 2559 if (!i || len > 0) { 2560 err = -EINVAL; 2561 goto out; 2562 } 2563 2564 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2565 kma ? &k : NULL); 2566 2567 out: 2568 return err; 2569 } 2570 #else 2571 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2572 struct sadb_msg *hdr, void **ext_hdrs) 2573 { 2574 return -ENOPROTOOPT; 2575 } 2576 #endif 2577 2578 2579 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2580 { 2581 struct net *net = sock_net(sk); 2582 unsigned int dir; 2583 int err = 0, delete; 2584 struct sadb_x_policy *pol; 2585 struct xfrm_policy *xp; 2586 struct km_event c; 2587 2588 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2589 return -EINVAL; 2590 2591 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2592 if (dir >= XFRM_POLICY_MAX) 2593 return -EINVAL; 2594 2595 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2596 xp = xfrm_policy_byid(net, XFRM_POLICY_TYPE_MAIN, dir, 2597 pol->sadb_x_policy_id, delete, &err); 2598 if (xp == NULL) 2599 return -ENOENT; 2600 2601 if (delete) { 2602 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2603 audit_get_loginuid(current), 2604 audit_get_sessionid(current), 0); 2605 2606 if (err) 2607 goto out; 2608 c.seq = hdr->sadb_msg_seq; 2609 c.pid = hdr->sadb_msg_pid; 2610 c.data.byid = 1; 2611 c.event = XFRM_MSG_DELPOLICY; 2612 km_policy_notify(xp, dir, &c); 2613 } else { 2614 err = key_pol_get_resp(sk, xp, hdr, dir); 2615 } 2616 2617 out: 2618 xfrm_pol_put(xp); 2619 return err; 2620 } 2621 2622 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2623 { 2624 struct pfkey_sock *pfk = ptr; 2625 struct sk_buff *out_skb; 2626 struct sadb_msg *out_hdr; 2627 int err; 2628 2629 if (!pfkey_can_dump(&pfk->sk)) 2630 return -ENOBUFS; 2631 2632 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2633 if (IS_ERR(out_skb)) 2634 return PTR_ERR(out_skb); 2635 2636 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2637 if (err < 0) 2638 return err; 2639 2640 out_hdr = (struct sadb_msg *) out_skb->data; 2641 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2642 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2643 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2644 out_hdr->sadb_msg_errno = 0; 2645 out_hdr->sadb_msg_seq = count + 1; 2646 out_hdr->sadb_msg_pid = pfk->dump.msg_pid; 2647 2648 if (pfk->dump.skb) 2649 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2650 &pfk->sk, sock_net(&pfk->sk)); 2651 pfk->dump.skb = out_skb; 2652 2653 return 0; 2654 } 2655 2656 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2657 { 2658 struct net *net = sock_net(&pfk->sk); 2659 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2660 } 2661 2662 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2663 { 2664 xfrm_policy_walk_done(&pfk->dump.u.policy); 2665 } 2666 2667 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2668 { 2669 struct pfkey_sock *pfk = pfkey_sk(sk); 2670 2671 if (pfk->dump.dump != NULL) 2672 return -EBUSY; 2673 2674 pfk->dump.msg_version = hdr->sadb_msg_version; 2675 pfk->dump.msg_pid = hdr->sadb_msg_pid; 2676 pfk->dump.dump = pfkey_dump_sp; 2677 pfk->dump.done = pfkey_dump_sp_done; 2678 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2679 2680 return pfkey_do_dump(pfk); 2681 } 2682 2683 static int key_notify_policy_flush(struct km_event *c) 2684 { 2685 struct sk_buff *skb_out; 2686 struct sadb_msg *hdr; 2687 2688 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2689 if (!skb_out) 2690 return -ENOBUFS; 2691 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2692 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2693 hdr->sadb_msg_seq = c->seq; 2694 hdr->sadb_msg_pid = c->pid; 2695 hdr->sadb_msg_version = PF_KEY_V2; 2696 hdr->sadb_msg_errno = (uint8_t) 0; 2697 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2698 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2699 return 0; 2700 2701 } 2702 2703 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2704 { 2705 struct net *net = sock_net(sk); 2706 struct km_event c; 2707 struct xfrm_audit audit_info; 2708 int err; 2709 2710 audit_info.loginuid = audit_get_loginuid(current); 2711 audit_info.sessionid = audit_get_sessionid(current); 2712 audit_info.secid = 0; 2713 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); 2714 if (err) 2715 return err; 2716 c.data.type = XFRM_POLICY_TYPE_MAIN; 2717 c.event = XFRM_MSG_FLUSHPOLICY; 2718 c.pid = hdr->sadb_msg_pid; 2719 c.seq = hdr->sadb_msg_seq; 2720 c.net = net; 2721 km_policy_notify(NULL, 0, &c); 2722 2723 return 0; 2724 } 2725 2726 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2727 struct sadb_msg *hdr, void **ext_hdrs); 2728 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2729 [SADB_RESERVED] = pfkey_reserved, 2730 [SADB_GETSPI] = pfkey_getspi, 2731 [SADB_UPDATE] = pfkey_add, 2732 [SADB_ADD] = pfkey_add, 2733 [SADB_DELETE] = pfkey_delete, 2734 [SADB_GET] = pfkey_get, 2735 [SADB_ACQUIRE] = pfkey_acquire, 2736 [SADB_REGISTER] = pfkey_register, 2737 [SADB_EXPIRE] = NULL, 2738 [SADB_FLUSH] = pfkey_flush, 2739 [SADB_DUMP] = pfkey_dump, 2740 [SADB_X_PROMISC] = pfkey_promisc, 2741 [SADB_X_PCHANGE] = NULL, 2742 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2743 [SADB_X_SPDADD] = pfkey_spdadd, 2744 [SADB_X_SPDDELETE] = pfkey_spddelete, 2745 [SADB_X_SPDGET] = pfkey_spdget, 2746 [SADB_X_SPDACQUIRE] = NULL, 2747 [SADB_X_SPDDUMP] = pfkey_spddump, 2748 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2749 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2750 [SADB_X_SPDDELETE2] = pfkey_spdget, 2751 [SADB_X_MIGRATE] = pfkey_migrate, 2752 }; 2753 2754 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2755 { 2756 void *ext_hdrs[SADB_EXT_MAX]; 2757 int err; 2758 2759 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2760 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2761 2762 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2763 err = parse_exthdrs(skb, hdr, ext_hdrs); 2764 if (!err) { 2765 err = -EOPNOTSUPP; 2766 if (pfkey_funcs[hdr->sadb_msg_type]) 2767 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2768 } 2769 return err; 2770 } 2771 2772 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2773 { 2774 struct sadb_msg *hdr = NULL; 2775 2776 if (skb->len < sizeof(*hdr)) { 2777 *errp = -EMSGSIZE; 2778 } else { 2779 hdr = (struct sadb_msg *) skb->data; 2780 if (hdr->sadb_msg_version != PF_KEY_V2 || 2781 hdr->sadb_msg_reserved != 0 || 2782 (hdr->sadb_msg_type <= SADB_RESERVED || 2783 hdr->sadb_msg_type > SADB_MAX)) { 2784 hdr = NULL; 2785 *errp = -EINVAL; 2786 } else if (hdr->sadb_msg_len != (skb->len / 2787 sizeof(uint64_t)) || 2788 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2789 sizeof(uint64_t))) { 2790 hdr = NULL; 2791 *errp = -EMSGSIZE; 2792 } else { 2793 *errp = 0; 2794 } 2795 } 2796 return hdr; 2797 } 2798 2799 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2800 { 2801 unsigned int id = d->desc.sadb_alg_id; 2802 2803 if (id >= sizeof(t->aalgos) * 8) 2804 return 0; 2805 2806 return (t->aalgos >> id) & 1; 2807 } 2808 2809 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2810 { 2811 unsigned int id = d->desc.sadb_alg_id; 2812 2813 if (id >= sizeof(t->ealgos) * 8) 2814 return 0; 2815 2816 return (t->ealgos >> id) & 1; 2817 } 2818 2819 static int count_ah_combs(struct xfrm_tmpl *t) 2820 { 2821 int i, sz = 0; 2822 2823 for (i = 0; ; i++) { 2824 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2825 if (!aalg) 2826 break; 2827 if (aalg_tmpl_set(t, aalg) && aalg->available) 2828 sz += sizeof(struct sadb_comb); 2829 } 2830 return sz + sizeof(struct sadb_prop); 2831 } 2832 2833 static int count_esp_combs(struct xfrm_tmpl *t) 2834 { 2835 int i, k, sz = 0; 2836 2837 for (i = 0; ; i++) { 2838 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2839 if (!ealg) 2840 break; 2841 2842 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2843 continue; 2844 2845 for (k = 1; ; k++) { 2846 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2847 if (!aalg) 2848 break; 2849 2850 if (aalg_tmpl_set(t, aalg) && aalg->available) 2851 sz += sizeof(struct sadb_comb); 2852 } 2853 } 2854 return sz + sizeof(struct sadb_prop); 2855 } 2856 2857 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2858 { 2859 struct sadb_prop *p; 2860 int i; 2861 2862 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2863 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2864 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2865 p->sadb_prop_replay = 32; 2866 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2867 2868 for (i = 0; ; i++) { 2869 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2870 if (!aalg) 2871 break; 2872 2873 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2874 struct sadb_comb *c; 2875 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2876 memset(c, 0, sizeof(*c)); 2877 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2878 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2879 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2880 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2881 c->sadb_comb_hard_addtime = 24*60*60; 2882 c->sadb_comb_soft_addtime = 20*60*60; 2883 c->sadb_comb_hard_usetime = 8*60*60; 2884 c->sadb_comb_soft_usetime = 7*60*60; 2885 } 2886 } 2887 } 2888 2889 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2890 { 2891 struct sadb_prop *p; 2892 int i, k; 2893 2894 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2895 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2896 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2897 p->sadb_prop_replay = 32; 2898 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2899 2900 for (i=0; ; i++) { 2901 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2902 if (!ealg) 2903 break; 2904 2905 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2906 continue; 2907 2908 for (k = 1; ; k++) { 2909 struct sadb_comb *c; 2910 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2911 if (!aalg) 2912 break; 2913 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2914 continue; 2915 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2916 memset(c, 0, sizeof(*c)); 2917 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2918 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2919 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2920 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2921 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2922 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2923 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2924 c->sadb_comb_hard_addtime = 24*60*60; 2925 c->sadb_comb_soft_addtime = 20*60*60; 2926 c->sadb_comb_hard_usetime = 8*60*60; 2927 c->sadb_comb_soft_usetime = 7*60*60; 2928 } 2929 } 2930 } 2931 2932 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2933 { 2934 return 0; 2935 } 2936 2937 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2938 { 2939 struct sk_buff *out_skb; 2940 struct sadb_msg *out_hdr; 2941 int hard; 2942 int hsc; 2943 2944 hard = c->data.hard; 2945 if (hard) 2946 hsc = 2; 2947 else 2948 hsc = 1; 2949 2950 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2951 if (IS_ERR(out_skb)) 2952 return PTR_ERR(out_skb); 2953 2954 out_hdr = (struct sadb_msg *) out_skb->data; 2955 out_hdr->sadb_msg_version = PF_KEY_V2; 2956 out_hdr->sadb_msg_type = SADB_EXPIRE; 2957 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2958 out_hdr->sadb_msg_errno = 0; 2959 out_hdr->sadb_msg_reserved = 0; 2960 out_hdr->sadb_msg_seq = 0; 2961 out_hdr->sadb_msg_pid = 0; 2962 2963 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2964 return 0; 2965 } 2966 2967 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2968 { 2969 struct net *net = x ? xs_net(x) : c->net; 2970 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 2971 2972 if (atomic_read(&net_pfkey->socks_nr) == 0) 2973 return 0; 2974 2975 switch (c->event) { 2976 case XFRM_MSG_EXPIRE: 2977 return key_notify_sa_expire(x, c); 2978 case XFRM_MSG_DELSA: 2979 case XFRM_MSG_NEWSA: 2980 case XFRM_MSG_UPDSA: 2981 return key_notify_sa(x, c); 2982 case XFRM_MSG_FLUSHSA: 2983 return key_notify_sa_flush(c); 2984 case XFRM_MSG_NEWAE: /* not yet supported */ 2985 break; 2986 default: 2987 printk("pfkey: Unknown SA event %d\n", c->event); 2988 break; 2989 } 2990 2991 return 0; 2992 } 2993 2994 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2995 { 2996 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 2997 return 0; 2998 2999 switch (c->event) { 3000 case XFRM_MSG_POLEXPIRE: 3001 return key_notify_policy_expire(xp, c); 3002 case XFRM_MSG_DELPOLICY: 3003 case XFRM_MSG_NEWPOLICY: 3004 case XFRM_MSG_UPDPOLICY: 3005 return key_notify_policy(xp, dir, c); 3006 case XFRM_MSG_FLUSHPOLICY: 3007 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3008 break; 3009 return key_notify_policy_flush(c); 3010 default: 3011 printk("pfkey: Unknown policy event %d\n", c->event); 3012 break; 3013 } 3014 3015 return 0; 3016 } 3017 3018 static u32 get_acqseq(void) 3019 { 3020 u32 res; 3021 static u32 acqseq; 3022 static DEFINE_SPINLOCK(acqseq_lock); 3023 3024 spin_lock_bh(&acqseq_lock); 3025 res = (++acqseq ? : ++acqseq); 3026 spin_unlock_bh(&acqseq_lock); 3027 return res; 3028 } 3029 3030 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 3031 { 3032 struct sk_buff *skb; 3033 struct sadb_msg *hdr; 3034 struct sadb_address *addr; 3035 struct sadb_x_policy *pol; 3036 int sockaddr_size; 3037 int size; 3038 struct sadb_x_sec_ctx *sec_ctx; 3039 struct xfrm_sec_ctx *xfrm_ctx; 3040 int ctx_size = 0; 3041 3042 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3043 if (!sockaddr_size) 3044 return -EINVAL; 3045 3046 size = sizeof(struct sadb_msg) + 3047 (sizeof(struct sadb_address) * 2) + 3048 (sockaddr_size * 2) + 3049 sizeof(struct sadb_x_policy); 3050 3051 if (x->id.proto == IPPROTO_AH) 3052 size += count_ah_combs(t); 3053 else if (x->id.proto == IPPROTO_ESP) 3054 size += count_esp_combs(t); 3055 3056 if ((xfrm_ctx = x->security)) { 3057 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3058 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3059 } 3060 3061 skb = alloc_skb(size + 16, GFP_ATOMIC); 3062 if (skb == NULL) 3063 return -ENOMEM; 3064 3065 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3066 hdr->sadb_msg_version = PF_KEY_V2; 3067 hdr->sadb_msg_type = SADB_ACQUIRE; 3068 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3069 hdr->sadb_msg_len = size / sizeof(uint64_t); 3070 hdr->sadb_msg_errno = 0; 3071 hdr->sadb_msg_reserved = 0; 3072 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3073 hdr->sadb_msg_pid = 0; 3074 3075 /* src address */ 3076 addr = (struct sadb_address*) skb_put(skb, 3077 sizeof(struct sadb_address)+sockaddr_size); 3078 addr->sadb_address_len = 3079 (sizeof(struct sadb_address)+sockaddr_size)/ 3080 sizeof(uint64_t); 3081 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3082 addr->sadb_address_proto = 0; 3083 addr->sadb_address_reserved = 0; 3084 addr->sadb_address_prefixlen = 3085 pfkey_sockaddr_fill(&x->props.saddr, 0, 3086 (struct sockaddr *) (addr + 1), 3087 x->props.family); 3088 if (!addr->sadb_address_prefixlen) 3089 BUG(); 3090 3091 /* dst address */ 3092 addr = (struct sadb_address*) skb_put(skb, 3093 sizeof(struct sadb_address)+sockaddr_size); 3094 addr->sadb_address_len = 3095 (sizeof(struct sadb_address)+sockaddr_size)/ 3096 sizeof(uint64_t); 3097 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3098 addr->sadb_address_proto = 0; 3099 addr->sadb_address_reserved = 0; 3100 addr->sadb_address_prefixlen = 3101 pfkey_sockaddr_fill(&x->id.daddr, 0, 3102 (struct sockaddr *) (addr + 1), 3103 x->props.family); 3104 if (!addr->sadb_address_prefixlen) 3105 BUG(); 3106 3107 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3108 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3109 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3110 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3111 pol->sadb_x_policy_dir = dir+1; 3112 pol->sadb_x_policy_id = xp->index; 3113 3114 /* Set sadb_comb's. */ 3115 if (x->id.proto == IPPROTO_AH) 3116 dump_ah_combs(skb, t); 3117 else if (x->id.proto == IPPROTO_ESP) 3118 dump_esp_combs(skb, t); 3119 3120 /* security context */ 3121 if (xfrm_ctx) { 3122 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3123 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3124 sec_ctx->sadb_x_sec_len = 3125 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3126 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3127 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3128 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3129 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3130 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3131 xfrm_ctx->ctx_len); 3132 } 3133 3134 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3135 } 3136 3137 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3138 u8 *data, int len, int *dir) 3139 { 3140 struct net *net = sock_net(sk); 3141 struct xfrm_policy *xp; 3142 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3143 struct sadb_x_sec_ctx *sec_ctx; 3144 3145 switch (sk->sk_family) { 3146 case AF_INET: 3147 if (opt != IP_IPSEC_POLICY) { 3148 *dir = -EOPNOTSUPP; 3149 return NULL; 3150 } 3151 break; 3152 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3153 case AF_INET6: 3154 if (opt != IPV6_IPSEC_POLICY) { 3155 *dir = -EOPNOTSUPP; 3156 return NULL; 3157 } 3158 break; 3159 #endif 3160 default: 3161 *dir = -EINVAL; 3162 return NULL; 3163 } 3164 3165 *dir = -EINVAL; 3166 3167 if (len < sizeof(struct sadb_x_policy) || 3168 pol->sadb_x_policy_len*8 > len || 3169 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3170 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3171 return NULL; 3172 3173 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3174 if (xp == NULL) { 3175 *dir = -ENOBUFS; 3176 return NULL; 3177 } 3178 3179 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3180 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3181 3182 xp->lft.soft_byte_limit = XFRM_INF; 3183 xp->lft.hard_byte_limit = XFRM_INF; 3184 xp->lft.soft_packet_limit = XFRM_INF; 3185 xp->lft.hard_packet_limit = XFRM_INF; 3186 xp->family = sk->sk_family; 3187 3188 xp->xfrm_nr = 0; 3189 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3190 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3191 goto out; 3192 3193 /* security context too */ 3194 if (len >= (pol->sadb_x_policy_len*8 + 3195 sizeof(struct sadb_x_sec_ctx))) { 3196 char *p = (char *)pol; 3197 struct xfrm_user_sec_ctx *uctx; 3198 3199 p += pol->sadb_x_policy_len*8; 3200 sec_ctx = (struct sadb_x_sec_ctx *)p; 3201 if (len < pol->sadb_x_policy_len*8 + 3202 sec_ctx->sadb_x_sec_len) { 3203 *dir = -EINVAL; 3204 goto out; 3205 } 3206 if ((*dir = verify_sec_ctx_len(p))) 3207 goto out; 3208 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3209 *dir = security_xfrm_policy_alloc(&xp->security, uctx); 3210 kfree(uctx); 3211 3212 if (*dir) 3213 goto out; 3214 } 3215 3216 *dir = pol->sadb_x_policy_dir-1; 3217 return xp; 3218 3219 out: 3220 xp->walk.dead = 1; 3221 xfrm_policy_destroy(xp); 3222 return NULL; 3223 } 3224 3225 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3226 { 3227 struct sk_buff *skb; 3228 struct sadb_msg *hdr; 3229 struct sadb_sa *sa; 3230 struct sadb_address *addr; 3231 struct sadb_x_nat_t_port *n_port; 3232 int sockaddr_size; 3233 int size; 3234 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3235 struct xfrm_encap_tmpl *natt = NULL; 3236 3237 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3238 if (!sockaddr_size) 3239 return -EINVAL; 3240 3241 if (!satype) 3242 return -EINVAL; 3243 3244 if (!x->encap) 3245 return -EINVAL; 3246 3247 natt = x->encap; 3248 3249 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3250 * 3251 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3252 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3253 */ 3254 3255 size = sizeof(struct sadb_msg) + 3256 sizeof(struct sadb_sa) + 3257 (sizeof(struct sadb_address) * 2) + 3258 (sockaddr_size * 2) + 3259 (sizeof(struct sadb_x_nat_t_port) * 2); 3260 3261 skb = alloc_skb(size + 16, GFP_ATOMIC); 3262 if (skb == NULL) 3263 return -ENOMEM; 3264 3265 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3266 hdr->sadb_msg_version = PF_KEY_V2; 3267 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3268 hdr->sadb_msg_satype = satype; 3269 hdr->sadb_msg_len = size / sizeof(uint64_t); 3270 hdr->sadb_msg_errno = 0; 3271 hdr->sadb_msg_reserved = 0; 3272 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3273 hdr->sadb_msg_pid = 0; 3274 3275 /* SA */ 3276 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3277 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3278 sa->sadb_sa_exttype = SADB_EXT_SA; 3279 sa->sadb_sa_spi = x->id.spi; 3280 sa->sadb_sa_replay = 0; 3281 sa->sadb_sa_state = 0; 3282 sa->sadb_sa_auth = 0; 3283 sa->sadb_sa_encrypt = 0; 3284 sa->sadb_sa_flags = 0; 3285 3286 /* ADDRESS_SRC (old addr) */ 3287 addr = (struct sadb_address*) 3288 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3289 addr->sadb_address_len = 3290 (sizeof(struct sadb_address)+sockaddr_size)/ 3291 sizeof(uint64_t); 3292 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3293 addr->sadb_address_proto = 0; 3294 addr->sadb_address_reserved = 0; 3295 addr->sadb_address_prefixlen = 3296 pfkey_sockaddr_fill(&x->props.saddr, 0, 3297 (struct sockaddr *) (addr + 1), 3298 x->props.family); 3299 if (!addr->sadb_address_prefixlen) 3300 BUG(); 3301 3302 /* NAT_T_SPORT (old port) */ 3303 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3304 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3305 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3306 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3307 n_port->sadb_x_nat_t_port_reserved = 0; 3308 3309 /* ADDRESS_DST (new addr) */ 3310 addr = (struct sadb_address*) 3311 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3312 addr->sadb_address_len = 3313 (sizeof(struct sadb_address)+sockaddr_size)/ 3314 sizeof(uint64_t); 3315 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3316 addr->sadb_address_proto = 0; 3317 addr->sadb_address_reserved = 0; 3318 addr->sadb_address_prefixlen = 3319 pfkey_sockaddr_fill(ipaddr, 0, 3320 (struct sockaddr *) (addr + 1), 3321 x->props.family); 3322 if (!addr->sadb_address_prefixlen) 3323 BUG(); 3324 3325 /* NAT_T_DPORT (new port) */ 3326 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3327 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3328 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3329 n_port->sadb_x_nat_t_port_port = sport; 3330 n_port->sadb_x_nat_t_port_reserved = 0; 3331 3332 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3333 } 3334 3335 #ifdef CONFIG_NET_KEY_MIGRATE 3336 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3337 struct xfrm_selector *sel) 3338 { 3339 struct sadb_address *addr; 3340 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3341 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3342 addr->sadb_address_exttype = type; 3343 addr->sadb_address_proto = sel->proto; 3344 addr->sadb_address_reserved = 0; 3345 3346 switch (type) { 3347 case SADB_EXT_ADDRESS_SRC: 3348 addr->sadb_address_prefixlen = sel->prefixlen_s; 3349 pfkey_sockaddr_fill(&sel->saddr, 0, 3350 (struct sockaddr *)(addr + 1), 3351 sel->family); 3352 break; 3353 case SADB_EXT_ADDRESS_DST: 3354 addr->sadb_address_prefixlen = sel->prefixlen_d; 3355 pfkey_sockaddr_fill(&sel->daddr, 0, 3356 (struct sockaddr *)(addr + 1), 3357 sel->family); 3358 break; 3359 default: 3360 return -EINVAL; 3361 } 3362 3363 return 0; 3364 } 3365 3366 3367 static int set_sadb_kmaddress(struct sk_buff *skb, struct xfrm_kmaddress *k) 3368 { 3369 struct sadb_x_kmaddress *kma; 3370 u8 *sa; 3371 int family = k->family; 3372 int socklen = pfkey_sockaddr_len(family); 3373 int size_req; 3374 3375 size_req = (sizeof(struct sadb_x_kmaddress) + 3376 pfkey_sockaddr_pair_size(family)); 3377 3378 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3379 memset(kma, 0, size_req); 3380 kma->sadb_x_kmaddress_len = size_req / 8; 3381 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3382 kma->sadb_x_kmaddress_reserved = k->reserved; 3383 3384 sa = (u8 *)(kma + 1); 3385 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3386 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3387 return -EINVAL; 3388 3389 return 0; 3390 } 3391 3392 static int set_ipsecrequest(struct sk_buff *skb, 3393 uint8_t proto, uint8_t mode, int level, 3394 uint32_t reqid, uint8_t family, 3395 xfrm_address_t *src, xfrm_address_t *dst) 3396 { 3397 struct sadb_x_ipsecrequest *rq; 3398 u8 *sa; 3399 int socklen = pfkey_sockaddr_len(family); 3400 int size_req; 3401 3402 size_req = sizeof(struct sadb_x_ipsecrequest) + 3403 pfkey_sockaddr_pair_size(family); 3404 3405 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3406 memset(rq, 0, size_req); 3407 rq->sadb_x_ipsecrequest_len = size_req; 3408 rq->sadb_x_ipsecrequest_proto = proto; 3409 rq->sadb_x_ipsecrequest_mode = mode; 3410 rq->sadb_x_ipsecrequest_level = level; 3411 rq->sadb_x_ipsecrequest_reqid = reqid; 3412 3413 sa = (u8 *) (rq + 1); 3414 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3415 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3416 return -EINVAL; 3417 3418 return 0; 3419 } 3420 #endif 3421 3422 #ifdef CONFIG_NET_KEY_MIGRATE 3423 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3424 struct xfrm_migrate *m, int num_bundles, 3425 struct xfrm_kmaddress *k) 3426 { 3427 int i; 3428 int sasize_sel; 3429 int size = 0; 3430 int size_pol = 0; 3431 struct sk_buff *skb; 3432 struct sadb_msg *hdr; 3433 struct sadb_x_policy *pol; 3434 struct xfrm_migrate *mp; 3435 3436 if (type != XFRM_POLICY_TYPE_MAIN) 3437 return 0; 3438 3439 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3440 return -EINVAL; 3441 3442 if (k != NULL) { 3443 /* addresses for KM */ 3444 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3445 pfkey_sockaddr_pair_size(k->family)); 3446 } 3447 3448 /* selector */ 3449 sasize_sel = pfkey_sockaddr_size(sel->family); 3450 if (!sasize_sel) 3451 return -EINVAL; 3452 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3453 3454 /* policy info */ 3455 size_pol += sizeof(struct sadb_x_policy); 3456 3457 /* ipsecrequests */ 3458 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3459 /* old locator pair */ 3460 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3461 pfkey_sockaddr_pair_size(mp->old_family); 3462 /* new locator pair */ 3463 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3464 pfkey_sockaddr_pair_size(mp->new_family); 3465 } 3466 3467 size += sizeof(struct sadb_msg) + size_pol; 3468 3469 /* alloc buffer */ 3470 skb = alloc_skb(size, GFP_ATOMIC); 3471 if (skb == NULL) 3472 return -ENOMEM; 3473 3474 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3475 hdr->sadb_msg_version = PF_KEY_V2; 3476 hdr->sadb_msg_type = SADB_X_MIGRATE; 3477 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3478 hdr->sadb_msg_len = size / 8; 3479 hdr->sadb_msg_errno = 0; 3480 hdr->sadb_msg_reserved = 0; 3481 hdr->sadb_msg_seq = 0; 3482 hdr->sadb_msg_pid = 0; 3483 3484 /* Addresses to be used by KM for negotiation, if ext is available */ 3485 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3486 return -EINVAL; 3487 3488 /* selector src */ 3489 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3490 3491 /* selector dst */ 3492 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3493 3494 /* policy information */ 3495 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3496 pol->sadb_x_policy_len = size_pol / 8; 3497 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3498 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3499 pol->sadb_x_policy_dir = dir + 1; 3500 pol->sadb_x_policy_id = 0; 3501 pol->sadb_x_policy_priority = 0; 3502 3503 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3504 /* old ipsecrequest */ 3505 int mode = pfkey_mode_from_xfrm(mp->mode); 3506 if (mode < 0) 3507 goto err; 3508 if (set_ipsecrequest(skb, mp->proto, mode, 3509 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3510 mp->reqid, mp->old_family, 3511 &mp->old_saddr, &mp->old_daddr) < 0) 3512 goto err; 3513 3514 /* new ipsecrequest */ 3515 if (set_ipsecrequest(skb, mp->proto, mode, 3516 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3517 mp->reqid, mp->new_family, 3518 &mp->new_saddr, &mp->new_daddr) < 0) 3519 goto err; 3520 } 3521 3522 /* broadcast migrate message to sockets */ 3523 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3524 3525 return 0; 3526 3527 err: 3528 kfree_skb(skb); 3529 return -EINVAL; 3530 } 3531 #else 3532 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3533 struct xfrm_migrate *m, int num_bundles, 3534 struct xfrm_kmaddress *k) 3535 { 3536 return -ENOPROTOOPT; 3537 } 3538 #endif 3539 3540 static int pfkey_sendmsg(struct kiocb *kiocb, 3541 struct socket *sock, struct msghdr *msg, size_t len) 3542 { 3543 struct sock *sk = sock->sk; 3544 struct sk_buff *skb = NULL; 3545 struct sadb_msg *hdr = NULL; 3546 int err; 3547 3548 err = -EOPNOTSUPP; 3549 if (msg->msg_flags & MSG_OOB) 3550 goto out; 3551 3552 err = -EMSGSIZE; 3553 if ((unsigned)len > sk->sk_sndbuf - 32) 3554 goto out; 3555 3556 err = -ENOBUFS; 3557 skb = alloc_skb(len, GFP_KERNEL); 3558 if (skb == NULL) 3559 goto out; 3560 3561 err = -EFAULT; 3562 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3563 goto out; 3564 3565 hdr = pfkey_get_base_msg(skb, &err); 3566 if (!hdr) 3567 goto out; 3568 3569 mutex_lock(&xfrm_cfg_mutex); 3570 err = pfkey_process(sk, skb, hdr); 3571 mutex_unlock(&xfrm_cfg_mutex); 3572 3573 out: 3574 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3575 err = 0; 3576 if (skb) 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_timestamp(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 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 atomic_read(&s->sk_rmem_alloc), 3668 atomic_read(&s->sk_wmem_alloc), 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 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 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; 3770 int rv; 3771 3772 net_pfkey = kmalloc(sizeof(struct netns_pfkey), GFP_KERNEL); 3773 if (!net_pfkey) { 3774 rv = -ENOMEM; 3775 goto out_kmalloc; 3776 } 3777 INIT_HLIST_HEAD(&net_pfkey->table); 3778 atomic_set(&net_pfkey->socks_nr, 0); 3779 rv = net_assign_generic(net, pfkey_net_id, net_pfkey); 3780 if (rv < 0) 3781 goto out_assign; 3782 rv = pfkey_init_proc(net); 3783 if (rv < 0) 3784 goto out_proc; 3785 return 0; 3786 3787 out_proc: 3788 out_assign: 3789 kfree(net_pfkey); 3790 out_kmalloc: 3791 return rv; 3792 } 3793 3794 static void __net_exit pfkey_net_exit(struct net *net) 3795 { 3796 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3797 3798 pfkey_exit_proc(net); 3799 BUG_ON(!hlist_empty(&net_pfkey->table)); 3800 kfree(net_pfkey); 3801 } 3802 3803 static struct pernet_operations pfkey_net_ops = { 3804 .init = pfkey_net_init, 3805 .exit = pfkey_net_exit, 3806 }; 3807 3808 static void __exit ipsec_pfkey_exit(void) 3809 { 3810 unregister_pernet_gen_subsys(pfkey_net_id, &pfkey_net_ops); 3811 xfrm_unregister_km(&pfkeyv2_mgr); 3812 sock_unregister(PF_KEY); 3813 proto_unregister(&key_proto); 3814 } 3815 3816 static int __init ipsec_pfkey_init(void) 3817 { 3818 int err = proto_register(&key_proto, 0); 3819 3820 if (err != 0) 3821 goto out; 3822 3823 err = sock_register(&pfkey_family_ops); 3824 if (err != 0) 3825 goto out_unregister_key_proto; 3826 err = xfrm_register_km(&pfkeyv2_mgr); 3827 if (err != 0) 3828 goto out_sock_unregister; 3829 err = register_pernet_gen_subsys(&pfkey_net_id, &pfkey_net_ops); 3830 if (err != 0) 3831 goto out_xfrm_unregister_km; 3832 out: 3833 return err; 3834 out_xfrm_unregister_km: 3835 xfrm_unregister_km(&pfkeyv2_mgr); 3836 out_sock_unregister: 3837 sock_unregister(PF_KEY); 3838 out_unregister_key_proto: 3839 proto_unregister(&key_proto); 3840 goto out; 3841 } 3842 3843 module_init(ipsec_pfkey_init); 3844 module_exit(ipsec_pfkey_exit); 3845 MODULE_LICENSE("GPL"); 3846 MODULE_ALIAS_NETPROTO(PF_KEY); 3847