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