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