1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 4 * 5 * Authors: Maxim Giryaev <gem@asplinux.ru> 6 * David S. Miller <davem@redhat.com> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 10 * Derek Atkins <derek@ihtfp.com> 11 */ 12 13 #include <linux/capability.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/socket.h> 17 #include <linux/pfkeyv2.h> 18 #include <linux/ipsec.h> 19 #include <linux/skbuff.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/in.h> 22 #include <linux/in6.h> 23 #include <linux/proc_fs.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/xfrm.h> 29 30 #include <net/sock.h> 31 32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 34 35 static unsigned int pfkey_net_id __read_mostly; 36 struct netns_pfkey { 37 /* List of all pfkey sockets. */ 38 struct hlist_head table; 39 atomic_t socks_nr; 40 }; 41 static DEFINE_MUTEX(pfkey_mutex); 42 43 #define DUMMY_MARK 0 44 static const struct xfrm_mark dummy_mark = {0, 0}; 45 struct pfkey_sock { 46 /* struct sock must be the first member of struct pfkey_sock */ 47 struct sock sk; 48 int registered; 49 int promisc; 50 51 struct { 52 uint8_t msg_version; 53 uint32_t msg_portid; 54 int (*dump)(struct pfkey_sock *sk); 55 void (*done)(struct pfkey_sock *sk); 56 union { 57 struct xfrm_policy_walk policy; 58 struct xfrm_state_walk state; 59 } u; 60 struct sk_buff *skb; 61 } dump; 62 struct mutex dump_lock; 63 }; 64 65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 66 xfrm_address_t *saddr, xfrm_address_t *daddr, 67 u16 *family); 68 69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 70 { 71 return (struct pfkey_sock *)sk; 72 } 73 74 static int pfkey_can_dump(const struct sock *sk) 75 { 76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 77 return 1; 78 return 0; 79 } 80 81 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 82 { 83 if (pfk->dump.dump) { 84 if (pfk->dump.skb) { 85 kfree_skb(pfk->dump.skb); 86 pfk->dump.skb = NULL; 87 } 88 pfk->dump.done(pfk); 89 pfk->dump.dump = NULL; 90 pfk->dump.done = NULL; 91 } 92 } 93 94 static void pfkey_sock_destruct(struct sock *sk) 95 { 96 struct net *net = sock_net(sk); 97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 98 99 pfkey_terminate_dump(pfkey_sk(sk)); 100 skb_queue_purge(&sk->sk_receive_queue); 101 102 if (!sock_flag(sk, SOCK_DEAD)) { 103 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 104 return; 105 } 106 107 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 108 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 109 110 atomic_dec(&net_pfkey->socks_nr); 111 } 112 113 static const struct proto_ops pfkey_ops; 114 115 static void pfkey_insert(struct sock *sk) 116 { 117 struct net *net = sock_net(sk); 118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 119 120 mutex_lock(&pfkey_mutex); 121 sk_add_node_rcu(sk, &net_pfkey->table); 122 mutex_unlock(&pfkey_mutex); 123 } 124 125 static void pfkey_remove(struct sock *sk) 126 { 127 mutex_lock(&pfkey_mutex); 128 sk_del_node_init_rcu(sk); 129 mutex_unlock(&pfkey_mutex); 130 } 131 132 static struct proto key_proto = { 133 .name = "KEY", 134 .owner = THIS_MODULE, 135 .obj_size = sizeof(struct pfkey_sock), 136 }; 137 138 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 139 int kern) 140 { 141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 142 struct sock *sk; 143 struct pfkey_sock *pfk; 144 int err; 145 146 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 147 return -EPERM; 148 if (sock->type != SOCK_RAW) 149 return -ESOCKTNOSUPPORT; 150 if (protocol != PF_KEY_V2) 151 return -EPROTONOSUPPORT; 152 153 err = -ENOMEM; 154 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 155 if (sk == NULL) 156 goto out; 157 158 pfk = pfkey_sk(sk); 159 mutex_init(&pfk->dump_lock); 160 161 sock->ops = &pfkey_ops; 162 sock_init_data(sock, sk); 163 164 sk->sk_family = PF_KEY; 165 sk->sk_destruct = pfkey_sock_destruct; 166 167 atomic_inc(&net_pfkey->socks_nr); 168 169 pfkey_insert(sk); 170 171 return 0; 172 out: 173 return err; 174 } 175 176 static int pfkey_release(struct socket *sock) 177 { 178 struct sock *sk = sock->sk; 179 180 if (!sk) 181 return 0; 182 183 pfkey_remove(sk); 184 185 sock_orphan(sk); 186 sock->sk = NULL; 187 skb_queue_purge(&sk->sk_write_queue); 188 189 synchronize_rcu(); 190 sock_put(sk); 191 192 return 0; 193 } 194 195 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 196 struct sock *sk) 197 { 198 int err = -ENOBUFS; 199 200 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 201 return err; 202 203 skb = skb_clone(skb, allocation); 204 205 if (skb) { 206 skb_set_owner_r(skb, sk); 207 skb_queue_tail(&sk->sk_receive_queue, skb); 208 sk->sk_data_ready(sk); 209 err = 0; 210 } 211 return err; 212 } 213 214 /* Send SKB to all pfkey sockets matching selected criteria. */ 215 #define BROADCAST_ALL 0 216 #define BROADCAST_ONE 1 217 #define BROADCAST_REGISTERED 2 218 #define BROADCAST_PROMISC_ONLY 4 219 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 220 int broadcast_flags, struct sock *one_sk, 221 struct net *net) 222 { 223 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 224 struct sock *sk; 225 int err = -ESRCH; 226 227 /* XXX Do we need something like netlink_overrun? I think 228 * XXX PF_KEY socket apps will not mind current behavior. 229 */ 230 if (!skb) 231 return -ENOMEM; 232 233 rcu_read_lock(); 234 sk_for_each_rcu(sk, &net_pfkey->table) { 235 struct pfkey_sock *pfk = pfkey_sk(sk); 236 int err2; 237 238 /* Yes, it means that if you are meant to receive this 239 * pfkey message you receive it twice as promiscuous 240 * socket. 241 */ 242 if (pfk->promisc) 243 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 244 245 /* the exact target will be processed later */ 246 if (sk == one_sk) 247 continue; 248 if (broadcast_flags != BROADCAST_ALL) { 249 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 250 continue; 251 if ((broadcast_flags & BROADCAST_REGISTERED) && 252 !pfk->registered) 253 continue; 254 if (broadcast_flags & BROADCAST_ONE) 255 continue; 256 } 257 258 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 259 260 /* Error is cleared after successful sending to at least one 261 * registered KM */ 262 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 263 err = err2; 264 } 265 rcu_read_unlock(); 266 267 if (one_sk != NULL) 268 err = pfkey_broadcast_one(skb, allocation, one_sk); 269 270 kfree_skb(skb); 271 return err; 272 } 273 274 static int pfkey_do_dump(struct pfkey_sock *pfk) 275 { 276 struct sadb_msg *hdr; 277 int rc; 278 279 mutex_lock(&pfk->dump_lock); 280 if (!pfk->dump.dump) { 281 rc = 0; 282 goto out; 283 } 284 285 rc = pfk->dump.dump(pfk); 286 if (rc == -ENOBUFS) { 287 rc = 0; 288 goto out; 289 } 290 291 if (pfk->dump.skb) { 292 if (!pfkey_can_dump(&pfk->sk)) { 293 rc = 0; 294 goto out; 295 } 296 297 hdr = (struct sadb_msg *) pfk->dump.skb->data; 298 hdr->sadb_msg_seq = 0; 299 hdr->sadb_msg_errno = rc; 300 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 301 &pfk->sk, sock_net(&pfk->sk)); 302 pfk->dump.skb = NULL; 303 } 304 305 pfkey_terminate_dump(pfk); 306 307 out: 308 mutex_unlock(&pfk->dump_lock); 309 return rc; 310 } 311 312 static inline void pfkey_hdr_dup(struct sadb_msg *new, 313 const struct sadb_msg *orig) 314 { 315 *new = *orig; 316 } 317 318 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 319 { 320 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 321 struct sadb_msg *hdr; 322 323 if (!skb) 324 return -ENOBUFS; 325 326 /* Woe be to the platform trying to support PFKEY yet 327 * having normal errnos outside the 1-255 range, inclusive. 328 */ 329 err = -err; 330 if (err == ERESTARTSYS || 331 err == ERESTARTNOHAND || 332 err == ERESTARTNOINTR) 333 err = EINTR; 334 if (err >= 512) 335 err = EINVAL; 336 BUG_ON(err <= 0 || err >= 256); 337 338 hdr = skb_put(skb, sizeof(struct sadb_msg)); 339 pfkey_hdr_dup(hdr, orig); 340 hdr->sadb_msg_errno = (uint8_t) err; 341 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 342 sizeof(uint64_t)); 343 344 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 345 346 return 0; 347 } 348 349 static const u8 sadb_ext_min_len[] = { 350 [SADB_EXT_RESERVED] = (u8) 0, 351 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 352 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 353 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 354 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 355 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 356 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 357 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 358 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 359 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 360 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 361 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 362 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 363 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 364 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 365 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 366 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 367 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 368 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 369 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 370 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 371 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 372 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 373 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 374 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 375 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 376 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 377 }; 378 379 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 380 static int verify_address_len(const void *p) 381 { 382 const struct sadb_address *sp = p; 383 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 384 const struct sockaddr_in *sin; 385 #if IS_ENABLED(CONFIG_IPV6) 386 const struct sockaddr_in6 *sin6; 387 #endif 388 int len; 389 390 if (sp->sadb_address_len < 391 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 392 sizeof(uint64_t))) 393 return -EINVAL; 394 395 switch (addr->sa_family) { 396 case AF_INET: 397 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 398 if (sp->sadb_address_len != len || 399 sp->sadb_address_prefixlen > 32) 400 return -EINVAL; 401 break; 402 #if IS_ENABLED(CONFIG_IPV6) 403 case AF_INET6: 404 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 405 if (sp->sadb_address_len != len || 406 sp->sadb_address_prefixlen > 128) 407 return -EINVAL; 408 break; 409 #endif 410 default: 411 /* It is user using kernel to keep track of security 412 * associations for another protocol, such as 413 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 414 * lengths. 415 * 416 * XXX Actually, association/policy database is not yet 417 * XXX able to cope with arbitrary sockaddr families. 418 * XXX When it can, remove this -EINVAL. -DaveM 419 */ 420 return -EINVAL; 421 } 422 423 return 0; 424 } 425 426 static inline int sadb_key_len(const struct sadb_key *key) 427 { 428 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 429 430 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 431 sizeof(uint64_t)); 432 } 433 434 static int verify_key_len(const void *p) 435 { 436 const struct sadb_key *key = p; 437 438 if (sadb_key_len(key) > key->sadb_key_len) 439 return -EINVAL; 440 441 return 0; 442 } 443 444 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 445 { 446 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 447 sec_ctx->sadb_x_ctx_len, 448 sizeof(uint64_t)); 449 } 450 451 static inline int verify_sec_ctx_len(const void *p) 452 { 453 const struct sadb_x_sec_ctx *sec_ctx = p; 454 int len = sec_ctx->sadb_x_ctx_len; 455 456 if (len > PAGE_SIZE) 457 return -EINVAL; 458 459 len = pfkey_sec_ctx_len(sec_ctx); 460 461 if (sec_ctx->sadb_x_sec_len != len) 462 return -EINVAL; 463 464 return 0; 465 } 466 467 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 468 gfp_t gfp) 469 { 470 struct xfrm_user_sec_ctx *uctx = NULL; 471 int ctx_size = sec_ctx->sadb_x_ctx_len; 472 473 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 474 475 if (!uctx) 476 return NULL; 477 478 uctx->len = pfkey_sec_ctx_len(sec_ctx); 479 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 480 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 481 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 482 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 483 memcpy(uctx + 1, sec_ctx + 1, 484 uctx->ctx_len); 485 486 return uctx; 487 } 488 489 static int present_and_same_family(const struct sadb_address *src, 490 const struct sadb_address *dst) 491 { 492 const struct sockaddr *s_addr, *d_addr; 493 494 if (!src || !dst) 495 return 0; 496 497 s_addr = (const struct sockaddr *)(src + 1); 498 d_addr = (const struct sockaddr *)(dst + 1); 499 if (s_addr->sa_family != d_addr->sa_family) 500 return 0; 501 if (s_addr->sa_family != AF_INET 502 #if IS_ENABLED(CONFIG_IPV6) 503 && s_addr->sa_family != AF_INET6 504 #endif 505 ) 506 return 0; 507 508 return 1; 509 } 510 511 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 512 { 513 const char *p = (char *) hdr; 514 int len = skb->len; 515 516 len -= sizeof(*hdr); 517 p += sizeof(*hdr); 518 while (len > 0) { 519 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 520 uint16_t ext_type; 521 int ext_len; 522 523 if (len < sizeof(*ehdr)) 524 return -EINVAL; 525 526 ext_len = ehdr->sadb_ext_len; 527 ext_len *= sizeof(uint64_t); 528 ext_type = ehdr->sadb_ext_type; 529 if (ext_len < sizeof(uint64_t) || 530 ext_len > len || 531 ext_type == SADB_EXT_RESERVED) 532 return -EINVAL; 533 534 if (ext_type <= SADB_EXT_MAX) { 535 int min = (int) sadb_ext_min_len[ext_type]; 536 if (ext_len < min) 537 return -EINVAL; 538 if (ext_hdrs[ext_type-1] != NULL) 539 return -EINVAL; 540 switch (ext_type) { 541 case SADB_EXT_ADDRESS_SRC: 542 case SADB_EXT_ADDRESS_DST: 543 case SADB_EXT_ADDRESS_PROXY: 544 case SADB_X_EXT_NAT_T_OA: 545 if (verify_address_len(p)) 546 return -EINVAL; 547 break; 548 case SADB_X_EXT_SEC_CTX: 549 if (verify_sec_ctx_len(p)) 550 return -EINVAL; 551 break; 552 case SADB_EXT_KEY_AUTH: 553 case SADB_EXT_KEY_ENCRYPT: 554 if (verify_key_len(p)) 555 return -EINVAL; 556 break; 557 default: 558 break; 559 } 560 ext_hdrs[ext_type-1] = (void *) p; 561 } 562 p += ext_len; 563 len -= ext_len; 564 } 565 566 return 0; 567 } 568 569 static uint16_t 570 pfkey_satype2proto(uint8_t satype) 571 { 572 switch (satype) { 573 case SADB_SATYPE_UNSPEC: 574 return IPSEC_PROTO_ANY; 575 case SADB_SATYPE_AH: 576 return IPPROTO_AH; 577 case SADB_SATYPE_ESP: 578 return IPPROTO_ESP; 579 case SADB_X_SATYPE_IPCOMP: 580 return IPPROTO_COMP; 581 default: 582 return 0; 583 } 584 /* NOTREACHED */ 585 } 586 587 static uint8_t 588 pfkey_proto2satype(uint16_t proto) 589 { 590 switch (proto) { 591 case IPPROTO_AH: 592 return SADB_SATYPE_AH; 593 case IPPROTO_ESP: 594 return SADB_SATYPE_ESP; 595 case IPPROTO_COMP: 596 return SADB_X_SATYPE_IPCOMP; 597 default: 598 return 0; 599 } 600 /* NOTREACHED */ 601 } 602 603 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 604 * say specifically 'just raw sockets' as we encode them as 255. 605 */ 606 607 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 608 { 609 return proto == IPSEC_PROTO_ANY ? 0 : proto; 610 } 611 612 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 613 { 614 return proto ? proto : IPSEC_PROTO_ANY; 615 } 616 617 static inline int pfkey_sockaddr_len(sa_family_t family) 618 { 619 switch (family) { 620 case AF_INET: 621 return sizeof(struct sockaddr_in); 622 #if IS_ENABLED(CONFIG_IPV6) 623 case AF_INET6: 624 return sizeof(struct sockaddr_in6); 625 #endif 626 } 627 return 0; 628 } 629 630 static 631 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 632 { 633 switch (sa->sa_family) { 634 case AF_INET: 635 xaddr->a4 = 636 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 637 return AF_INET; 638 #if IS_ENABLED(CONFIG_IPV6) 639 case AF_INET6: 640 memcpy(xaddr->a6, 641 &((struct sockaddr_in6 *)sa)->sin6_addr, 642 sizeof(struct in6_addr)); 643 return AF_INET6; 644 #endif 645 } 646 return 0; 647 } 648 649 static 650 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 651 { 652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 653 xaddr); 654 } 655 656 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 657 { 658 const struct sadb_sa *sa; 659 const struct sadb_address *addr; 660 uint16_t proto; 661 unsigned short family; 662 xfrm_address_t *xaddr; 663 664 sa = ext_hdrs[SADB_EXT_SA - 1]; 665 if (sa == NULL) 666 return NULL; 667 668 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 669 if (proto == 0) 670 return NULL; 671 672 /* sadb_address_len should be checked by caller */ 673 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 674 if (addr == NULL) 675 return NULL; 676 677 family = ((const struct sockaddr *)(addr + 1))->sa_family; 678 switch (family) { 679 case AF_INET: 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 681 break; 682 #if IS_ENABLED(CONFIG_IPV6) 683 case AF_INET6: 684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 685 break; 686 #endif 687 default: 688 xaddr = NULL; 689 } 690 691 if (!xaddr) 692 return NULL; 693 694 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 695 } 696 697 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 698 699 static int 700 pfkey_sockaddr_size(sa_family_t family) 701 { 702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 703 } 704 705 static inline int pfkey_mode_from_xfrm(int mode) 706 { 707 switch(mode) { 708 case XFRM_MODE_TRANSPORT: 709 return IPSEC_MODE_TRANSPORT; 710 case XFRM_MODE_TUNNEL: 711 return IPSEC_MODE_TUNNEL; 712 case XFRM_MODE_BEET: 713 return IPSEC_MODE_BEET; 714 default: 715 return -1; 716 } 717 } 718 719 static inline int pfkey_mode_to_xfrm(int mode) 720 { 721 switch(mode) { 722 case IPSEC_MODE_ANY: /*XXX*/ 723 case IPSEC_MODE_TRANSPORT: 724 return XFRM_MODE_TRANSPORT; 725 case IPSEC_MODE_TUNNEL: 726 return XFRM_MODE_TUNNEL; 727 case IPSEC_MODE_BEET: 728 return XFRM_MODE_BEET; 729 default: 730 return -1; 731 } 732 } 733 734 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 735 struct sockaddr *sa, 736 unsigned short family) 737 { 738 switch (family) { 739 case AF_INET: 740 { 741 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 742 sin->sin_family = AF_INET; 743 sin->sin_port = port; 744 sin->sin_addr.s_addr = xaddr->a4; 745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 746 return 32; 747 } 748 #if IS_ENABLED(CONFIG_IPV6) 749 case AF_INET6: 750 { 751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 752 sin6->sin6_family = AF_INET6; 753 sin6->sin6_port = port; 754 sin6->sin6_flowinfo = 0; 755 sin6->sin6_addr = xaddr->in6; 756 sin6->sin6_scope_id = 0; 757 return 128; 758 } 759 #endif 760 } 761 return 0; 762 } 763 764 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 765 int add_keys, int hsc) 766 { 767 struct sk_buff *skb; 768 struct sadb_msg *hdr; 769 struct sadb_sa *sa; 770 struct sadb_lifetime *lifetime; 771 struct sadb_address *addr; 772 struct sadb_key *key; 773 struct sadb_x_sa2 *sa2; 774 struct sadb_x_sec_ctx *sec_ctx; 775 struct xfrm_sec_ctx *xfrm_ctx; 776 int ctx_size = 0; 777 int size; 778 int auth_key_size = 0; 779 int encrypt_key_size = 0; 780 int sockaddr_size; 781 struct xfrm_encap_tmpl *natt = NULL; 782 int mode; 783 784 /* address family check */ 785 sockaddr_size = pfkey_sockaddr_size(x->props.family); 786 if (!sockaddr_size) 787 return ERR_PTR(-EINVAL); 788 789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 790 key(AE), (identity(SD),) (sensitivity)> */ 791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 792 sizeof(struct sadb_lifetime) + 793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 795 sizeof(struct sadb_address)*2 + 796 sockaddr_size*2 + 797 sizeof(struct sadb_x_sa2); 798 799 if ((xfrm_ctx = x->security)) { 800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 802 } 803 804 /* identity & sensitivity */ 805 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 806 size += sizeof(struct sadb_address) + sockaddr_size; 807 808 if (add_keys) { 809 if (x->aalg && x->aalg->alg_key_len) { 810 auth_key_size = 811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 812 size += sizeof(struct sadb_key) + auth_key_size; 813 } 814 if (x->ealg && x->ealg->alg_key_len) { 815 encrypt_key_size = 816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 817 size += sizeof(struct sadb_key) + encrypt_key_size; 818 } 819 } 820 if (x->encap) 821 natt = x->encap; 822 823 if (natt && natt->encap_type) { 824 size += sizeof(struct sadb_x_nat_t_type); 825 size += sizeof(struct sadb_x_nat_t_port); 826 size += sizeof(struct sadb_x_nat_t_port); 827 } 828 829 skb = alloc_skb(size + 16, GFP_ATOMIC); 830 if (skb == NULL) 831 return ERR_PTR(-ENOBUFS); 832 833 /* call should fill header later */ 834 hdr = skb_put(skb, sizeof(struct sadb_msg)); 835 memset(hdr, 0, size); /* XXX do we need this ? */ 836 hdr->sadb_msg_len = size / sizeof(uint64_t); 837 838 /* sa */ 839 sa = skb_put(skb, sizeof(struct sadb_sa)); 840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 841 sa->sadb_sa_exttype = SADB_EXT_SA; 842 sa->sadb_sa_spi = x->id.spi; 843 sa->sadb_sa_replay = x->props.replay_window; 844 switch (x->km.state) { 845 case XFRM_STATE_VALID: 846 sa->sadb_sa_state = x->km.dying ? 847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 848 break; 849 case XFRM_STATE_ACQ: 850 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 851 break; 852 default: 853 sa->sadb_sa_state = SADB_SASTATE_DEAD; 854 break; 855 } 856 sa->sadb_sa_auth = 0; 857 if (x->aalg) { 858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 859 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 860 a->desc.sadb_alg_id : 0; 861 } 862 sa->sadb_sa_encrypt = 0; 863 BUG_ON(x->ealg && x->calg); 864 if (x->ealg) { 865 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 866 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 867 a->desc.sadb_alg_id : 0; 868 } 869 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 870 if (x->calg) { 871 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 872 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 873 a->desc.sadb_alg_id : 0; 874 } 875 876 sa->sadb_sa_flags = 0; 877 if (x->props.flags & XFRM_STATE_NOECN) 878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 879 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 880 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 881 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 883 884 /* hard time */ 885 if (hsc & 2) { 886 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 887 lifetime->sadb_lifetime_len = 888 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 889 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 890 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 891 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 892 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 893 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 894 } 895 /* soft time */ 896 if (hsc & 1) { 897 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 898 lifetime->sadb_lifetime_len = 899 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 900 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 901 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 902 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 903 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 904 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 905 } 906 /* current time */ 907 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 908 lifetime->sadb_lifetime_len = 909 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 911 lifetime->sadb_lifetime_allocations = x->curlft.packets; 912 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 913 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 914 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 915 /* src address */ 916 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 917 addr->sadb_address_len = 918 (sizeof(struct sadb_address)+sockaddr_size)/ 919 sizeof(uint64_t); 920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 921 /* "if the ports are non-zero, then the sadb_address_proto field, 922 normally zero, MUST be filled in with the transport 923 protocol's number." - RFC2367 */ 924 addr->sadb_address_proto = 0; 925 addr->sadb_address_reserved = 0; 926 927 addr->sadb_address_prefixlen = 928 pfkey_sockaddr_fill(&x->props.saddr, 0, 929 (struct sockaddr *) (addr + 1), 930 x->props.family); 931 if (!addr->sadb_address_prefixlen) 932 BUG(); 933 934 /* dst address */ 935 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 936 addr->sadb_address_len = 937 (sizeof(struct sadb_address)+sockaddr_size)/ 938 sizeof(uint64_t); 939 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 940 addr->sadb_address_proto = 0; 941 addr->sadb_address_reserved = 0; 942 943 addr->sadb_address_prefixlen = 944 pfkey_sockaddr_fill(&x->id.daddr, 0, 945 (struct sockaddr *) (addr + 1), 946 x->props.family); 947 if (!addr->sadb_address_prefixlen) 948 BUG(); 949 950 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 951 x->props.family)) { 952 addr = skb_put(skb, 953 sizeof(struct sadb_address) + sockaddr_size); 954 addr->sadb_address_len = 955 (sizeof(struct sadb_address)+sockaddr_size)/ 956 sizeof(uint64_t); 957 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 958 addr->sadb_address_proto = 959 pfkey_proto_from_xfrm(x->sel.proto); 960 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 961 addr->sadb_address_reserved = 0; 962 963 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 964 (struct sockaddr *) (addr + 1), 965 x->props.family); 966 } 967 968 /* auth key */ 969 if (add_keys && auth_key_size) { 970 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 971 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 972 sizeof(uint64_t); 973 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 974 key->sadb_key_bits = x->aalg->alg_key_len; 975 key->sadb_key_reserved = 0; 976 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 977 } 978 /* encrypt key */ 979 if (add_keys && encrypt_key_size) { 980 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 981 key->sadb_key_len = (sizeof(struct sadb_key) + 982 encrypt_key_size) / sizeof(uint64_t); 983 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 984 key->sadb_key_bits = x->ealg->alg_key_len; 985 key->sadb_key_reserved = 0; 986 memcpy(key + 1, x->ealg->alg_key, 987 (x->ealg->alg_key_len+7)/8); 988 } 989 990 /* sa */ 991 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 992 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 993 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 994 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 995 kfree_skb(skb); 996 return ERR_PTR(-EINVAL); 997 } 998 sa2->sadb_x_sa2_mode = mode; 999 sa2->sadb_x_sa2_reserved1 = 0; 1000 sa2->sadb_x_sa2_reserved2 = 0; 1001 sa2->sadb_x_sa2_sequence = 0; 1002 sa2->sadb_x_sa2_reqid = x->props.reqid; 1003 1004 if (natt && natt->encap_type) { 1005 struct sadb_x_nat_t_type *n_type; 1006 struct sadb_x_nat_t_port *n_port; 1007 1008 /* type */ 1009 n_type = skb_put(skb, sizeof(*n_type)); 1010 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1011 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1012 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1013 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1014 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1015 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1016 1017 /* source port */ 1018 n_port = skb_put(skb, sizeof(*n_port)); 1019 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1020 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1021 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1022 n_port->sadb_x_nat_t_port_reserved = 0; 1023 1024 /* dest port */ 1025 n_port = skb_put(skb, sizeof(*n_port)); 1026 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1027 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1028 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1029 n_port->sadb_x_nat_t_port_reserved = 0; 1030 } 1031 1032 /* security context */ 1033 if (xfrm_ctx) { 1034 sec_ctx = skb_put(skb, 1035 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1036 sec_ctx->sadb_x_sec_len = 1037 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1038 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1039 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1040 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1041 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1042 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1043 xfrm_ctx->ctx_len); 1044 } 1045 1046 return skb; 1047 } 1048 1049 1050 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1051 { 1052 struct sk_buff *skb; 1053 1054 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1055 1056 return skb; 1057 } 1058 1059 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1060 int hsc) 1061 { 1062 return __pfkey_xfrm_state2msg(x, 0, hsc); 1063 } 1064 1065 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1066 const struct sadb_msg *hdr, 1067 void * const *ext_hdrs) 1068 { 1069 struct xfrm_state *x; 1070 const struct sadb_lifetime *lifetime; 1071 const struct sadb_sa *sa; 1072 const struct sadb_key *key; 1073 const struct sadb_x_sec_ctx *sec_ctx; 1074 uint16_t proto; 1075 int err; 1076 1077 1078 sa = ext_hdrs[SADB_EXT_SA - 1]; 1079 if (!sa || 1080 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1081 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1082 return ERR_PTR(-EINVAL); 1083 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1084 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1085 return ERR_PTR(-EINVAL); 1086 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1087 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1088 return ERR_PTR(-EINVAL); 1089 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1090 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1091 return ERR_PTR(-EINVAL); 1092 1093 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1094 if (proto == 0) 1095 return ERR_PTR(-EINVAL); 1096 1097 /* default error is no buffer space */ 1098 err = -ENOBUFS; 1099 1100 /* RFC2367: 1101 1102 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1103 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1104 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1105 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1106 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1107 not true. 1108 1109 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1110 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1111 */ 1112 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1113 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1114 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1115 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1116 return ERR_PTR(-EINVAL); 1117 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1118 if (key != NULL && 1119 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1120 key->sadb_key_bits == 0) 1121 return ERR_PTR(-EINVAL); 1122 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1123 if (key != NULL && 1124 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1125 key->sadb_key_bits == 0) 1126 return ERR_PTR(-EINVAL); 1127 1128 x = xfrm_state_alloc(net); 1129 if (x == NULL) 1130 return ERR_PTR(-ENOBUFS); 1131 1132 x->id.proto = proto; 1133 x->id.spi = sa->sadb_sa_spi; 1134 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1135 (sizeof(x->replay.bitmap) * 8)); 1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1137 x->props.flags |= XFRM_STATE_NOECN; 1138 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1139 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1140 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1141 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1142 1143 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1144 if (lifetime != NULL) { 1145 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1146 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1147 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1148 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1149 } 1150 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1151 if (lifetime != NULL) { 1152 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1153 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1154 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1155 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1156 } 1157 1158 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1159 if (sec_ctx != NULL) { 1160 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1161 1162 if (!uctx) 1163 goto out; 1164 1165 err = security_xfrm_state_alloc(x, uctx); 1166 kfree(uctx); 1167 1168 if (err) 1169 goto out; 1170 } 1171 1172 err = -ENOBUFS; 1173 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1174 if (sa->sadb_sa_auth) { 1175 int keysize = 0; 1176 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1177 if (!a || !a->pfkey_supported) { 1178 err = -ENOSYS; 1179 goto out; 1180 } 1181 if (key) 1182 keysize = (key->sadb_key_bits + 7) / 8; 1183 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1184 if (!x->aalg) { 1185 err = -ENOMEM; 1186 goto out; 1187 } 1188 strcpy(x->aalg->alg_name, a->name); 1189 x->aalg->alg_key_len = 0; 1190 if (key) { 1191 x->aalg->alg_key_len = key->sadb_key_bits; 1192 memcpy(x->aalg->alg_key, key+1, keysize); 1193 } 1194 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1195 x->props.aalgo = sa->sadb_sa_auth; 1196 /* x->algo.flags = sa->sadb_sa_flags; */ 1197 } 1198 if (sa->sadb_sa_encrypt) { 1199 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1200 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1201 if (!a || !a->pfkey_supported) { 1202 err = -ENOSYS; 1203 goto out; 1204 } 1205 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1206 if (!x->calg) { 1207 err = -ENOMEM; 1208 goto out; 1209 } 1210 strcpy(x->calg->alg_name, a->name); 1211 x->props.calgo = sa->sadb_sa_encrypt; 1212 } else { 1213 int keysize = 0; 1214 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1215 if (!a || !a->pfkey_supported) { 1216 err = -ENOSYS; 1217 goto out; 1218 } 1219 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1220 if (key) 1221 keysize = (key->sadb_key_bits + 7) / 8; 1222 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1223 if (!x->ealg) { 1224 err = -ENOMEM; 1225 goto out; 1226 } 1227 strcpy(x->ealg->alg_name, a->name); 1228 x->ealg->alg_key_len = 0; 1229 if (key) { 1230 x->ealg->alg_key_len = key->sadb_key_bits; 1231 memcpy(x->ealg->alg_key, key+1, keysize); 1232 } 1233 x->props.ealgo = sa->sadb_sa_encrypt; 1234 x->geniv = a->uinfo.encr.geniv; 1235 } 1236 } 1237 /* x->algo.flags = sa->sadb_sa_flags; */ 1238 1239 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1240 &x->props.saddr); 1241 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1242 &x->id.daddr); 1243 1244 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1245 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1246 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1247 if (mode < 0) { 1248 err = -EINVAL; 1249 goto out; 1250 } 1251 x->props.mode = mode; 1252 x->props.reqid = sa2->sadb_x_sa2_reqid; 1253 } 1254 1255 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1256 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1257 1258 /* Nobody uses this, but we try. */ 1259 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1260 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1261 } 1262 1263 if (!x->sel.family) 1264 x->sel.family = x->props.family; 1265 1266 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1267 const struct sadb_x_nat_t_type* n_type; 1268 struct xfrm_encap_tmpl *natt; 1269 1270 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1271 if (!x->encap) { 1272 err = -ENOMEM; 1273 goto out; 1274 } 1275 1276 natt = x->encap; 1277 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1278 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1279 1280 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1281 const struct sadb_x_nat_t_port *n_port = 1282 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1283 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1284 } 1285 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1286 const struct sadb_x_nat_t_port *n_port = 1287 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1288 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1289 } 1290 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1291 } 1292 1293 err = xfrm_init_state(x); 1294 if (err) 1295 goto out; 1296 1297 x->km.seq = hdr->sadb_msg_seq; 1298 return x; 1299 1300 out: 1301 x->km.state = XFRM_STATE_DEAD; 1302 xfrm_state_put(x); 1303 return ERR_PTR(err); 1304 } 1305 1306 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1307 { 1308 return -EOPNOTSUPP; 1309 } 1310 1311 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1312 { 1313 struct net *net = sock_net(sk); 1314 struct sk_buff *resp_skb; 1315 struct sadb_x_sa2 *sa2; 1316 struct sadb_address *saddr, *daddr; 1317 struct sadb_msg *out_hdr; 1318 struct sadb_spirange *range; 1319 struct xfrm_state *x = NULL; 1320 int mode; 1321 int err; 1322 u32 min_spi, max_spi; 1323 u32 reqid; 1324 u8 proto; 1325 unsigned short family; 1326 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1327 1328 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1329 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1330 return -EINVAL; 1331 1332 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1333 if (proto == 0) 1334 return -EINVAL; 1335 1336 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1337 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1338 if (mode < 0) 1339 return -EINVAL; 1340 reqid = sa2->sadb_x_sa2_reqid; 1341 } else { 1342 mode = 0; 1343 reqid = 0; 1344 } 1345 1346 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1347 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1348 1349 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1350 switch (family) { 1351 case AF_INET: 1352 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1353 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1354 break; 1355 #if IS_ENABLED(CONFIG_IPV6) 1356 case AF_INET6: 1357 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1358 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1359 break; 1360 #endif 1361 } 1362 1363 if (hdr->sadb_msg_seq) { 1364 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1365 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1366 xfrm_state_put(x); 1367 x = NULL; 1368 } 1369 } 1370 1371 if (!x) 1372 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); 1373 1374 if (x == NULL) 1375 return -ENOENT; 1376 1377 min_spi = 0x100; 1378 max_spi = 0x0fffffff; 1379 1380 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1381 if (range) { 1382 min_spi = range->sadb_spirange_min; 1383 max_spi = range->sadb_spirange_max; 1384 } 1385 1386 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1387 if (err) { 1388 xfrm_state_put(x); 1389 return err; 1390 } 1391 1392 err = xfrm_alloc_spi(x, min_spi, max_spi); 1393 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1394 1395 if (IS_ERR(resp_skb)) { 1396 xfrm_state_put(x); 1397 return PTR_ERR(resp_skb); 1398 } 1399 1400 out_hdr = (struct sadb_msg *) resp_skb->data; 1401 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1402 out_hdr->sadb_msg_type = SADB_GETSPI; 1403 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1404 out_hdr->sadb_msg_errno = 0; 1405 out_hdr->sadb_msg_reserved = 0; 1406 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1407 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1408 1409 xfrm_state_put(x); 1410 1411 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1412 1413 return 0; 1414 } 1415 1416 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1417 { 1418 struct net *net = sock_net(sk); 1419 struct xfrm_state *x; 1420 1421 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1422 return -EOPNOTSUPP; 1423 1424 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1425 return 0; 1426 1427 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1428 if (x == NULL) 1429 return 0; 1430 1431 spin_lock_bh(&x->lock); 1432 if (x->km.state == XFRM_STATE_ACQ) 1433 x->km.state = XFRM_STATE_ERROR; 1434 1435 spin_unlock_bh(&x->lock); 1436 xfrm_state_put(x); 1437 return 0; 1438 } 1439 1440 static inline int event2poltype(int event) 1441 { 1442 switch (event) { 1443 case XFRM_MSG_DELPOLICY: 1444 return SADB_X_SPDDELETE; 1445 case XFRM_MSG_NEWPOLICY: 1446 return SADB_X_SPDADD; 1447 case XFRM_MSG_UPDPOLICY: 1448 return SADB_X_SPDUPDATE; 1449 case XFRM_MSG_POLEXPIRE: 1450 // return SADB_X_SPDEXPIRE; 1451 default: 1452 pr_err("pfkey: Unknown policy event %d\n", event); 1453 break; 1454 } 1455 1456 return 0; 1457 } 1458 1459 static inline int event2keytype(int event) 1460 { 1461 switch (event) { 1462 case XFRM_MSG_DELSA: 1463 return SADB_DELETE; 1464 case XFRM_MSG_NEWSA: 1465 return SADB_ADD; 1466 case XFRM_MSG_UPDSA: 1467 return SADB_UPDATE; 1468 case XFRM_MSG_EXPIRE: 1469 return SADB_EXPIRE; 1470 default: 1471 pr_err("pfkey: Unknown SA event %d\n", event); 1472 break; 1473 } 1474 1475 return 0; 1476 } 1477 1478 /* ADD/UPD/DEL */ 1479 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1480 { 1481 struct sk_buff *skb; 1482 struct sadb_msg *hdr; 1483 1484 skb = pfkey_xfrm_state2msg(x); 1485 1486 if (IS_ERR(skb)) 1487 return PTR_ERR(skb); 1488 1489 hdr = (struct sadb_msg *) skb->data; 1490 hdr->sadb_msg_version = PF_KEY_V2; 1491 hdr->sadb_msg_type = event2keytype(c->event); 1492 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1493 hdr->sadb_msg_errno = 0; 1494 hdr->sadb_msg_reserved = 0; 1495 hdr->sadb_msg_seq = c->seq; 1496 hdr->sadb_msg_pid = c->portid; 1497 1498 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1499 1500 return 0; 1501 } 1502 1503 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1504 { 1505 struct net *net = sock_net(sk); 1506 struct xfrm_state *x; 1507 int err; 1508 struct km_event c; 1509 1510 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1511 if (IS_ERR(x)) 1512 return PTR_ERR(x); 1513 1514 xfrm_state_hold(x); 1515 if (hdr->sadb_msg_type == SADB_ADD) 1516 err = xfrm_state_add(x); 1517 else 1518 err = xfrm_state_update(x); 1519 1520 xfrm_audit_state_add(x, err ? 0 : 1, true); 1521 1522 if (err < 0) { 1523 x->km.state = XFRM_STATE_DEAD; 1524 __xfrm_state_put(x); 1525 goto out; 1526 } 1527 1528 if (hdr->sadb_msg_type == SADB_ADD) 1529 c.event = XFRM_MSG_NEWSA; 1530 else 1531 c.event = XFRM_MSG_UPDSA; 1532 c.seq = hdr->sadb_msg_seq; 1533 c.portid = hdr->sadb_msg_pid; 1534 km_state_notify(x, &c); 1535 out: 1536 xfrm_state_put(x); 1537 return err; 1538 } 1539 1540 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1541 { 1542 struct net *net = sock_net(sk); 1543 struct xfrm_state *x; 1544 struct km_event c; 1545 int err; 1546 1547 if (!ext_hdrs[SADB_EXT_SA-1] || 1548 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1549 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1550 return -EINVAL; 1551 1552 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1553 if (x == NULL) 1554 return -ESRCH; 1555 1556 if ((err = security_xfrm_state_delete(x))) 1557 goto out; 1558 1559 if (xfrm_state_kern(x)) { 1560 err = -EPERM; 1561 goto out; 1562 } 1563 1564 err = xfrm_state_delete(x); 1565 1566 if (err < 0) 1567 goto out; 1568 1569 c.seq = hdr->sadb_msg_seq; 1570 c.portid = hdr->sadb_msg_pid; 1571 c.event = XFRM_MSG_DELSA; 1572 km_state_notify(x, &c); 1573 out: 1574 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1575 xfrm_state_put(x); 1576 1577 return err; 1578 } 1579 1580 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1581 { 1582 struct net *net = sock_net(sk); 1583 __u8 proto; 1584 struct sk_buff *out_skb; 1585 struct sadb_msg *out_hdr; 1586 struct xfrm_state *x; 1587 1588 if (!ext_hdrs[SADB_EXT_SA-1] || 1589 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1590 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1591 return -EINVAL; 1592 1593 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1594 if (x == NULL) 1595 return -ESRCH; 1596 1597 out_skb = pfkey_xfrm_state2msg(x); 1598 proto = x->id.proto; 1599 xfrm_state_put(x); 1600 if (IS_ERR(out_skb)) 1601 return PTR_ERR(out_skb); 1602 1603 out_hdr = (struct sadb_msg *) out_skb->data; 1604 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1605 out_hdr->sadb_msg_type = SADB_GET; 1606 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1607 out_hdr->sadb_msg_errno = 0; 1608 out_hdr->sadb_msg_reserved = 0; 1609 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1610 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1611 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1612 1613 return 0; 1614 } 1615 1616 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1617 gfp_t allocation) 1618 { 1619 struct sk_buff *skb; 1620 struct sadb_msg *hdr; 1621 int len, auth_len, enc_len, i; 1622 1623 auth_len = xfrm_count_pfkey_auth_supported(); 1624 if (auth_len) { 1625 auth_len *= sizeof(struct sadb_alg); 1626 auth_len += sizeof(struct sadb_supported); 1627 } 1628 1629 enc_len = xfrm_count_pfkey_enc_supported(); 1630 if (enc_len) { 1631 enc_len *= sizeof(struct sadb_alg); 1632 enc_len += sizeof(struct sadb_supported); 1633 } 1634 1635 len = enc_len + auth_len + sizeof(struct sadb_msg); 1636 1637 skb = alloc_skb(len + 16, allocation); 1638 if (!skb) 1639 goto out_put_algs; 1640 1641 hdr = skb_put(skb, sizeof(*hdr)); 1642 pfkey_hdr_dup(hdr, orig); 1643 hdr->sadb_msg_errno = 0; 1644 hdr->sadb_msg_len = len / sizeof(uint64_t); 1645 1646 if (auth_len) { 1647 struct sadb_supported *sp; 1648 struct sadb_alg *ap; 1649 1650 sp = skb_put(skb, auth_len); 1651 ap = (struct sadb_alg *) (sp + 1); 1652 1653 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1654 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1655 1656 for (i = 0; ; i++) { 1657 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1658 if (!aalg) 1659 break; 1660 if (!aalg->pfkey_supported) 1661 continue; 1662 if (aalg->available) 1663 *ap++ = aalg->desc; 1664 } 1665 } 1666 1667 if (enc_len) { 1668 struct sadb_supported *sp; 1669 struct sadb_alg *ap; 1670 1671 sp = skb_put(skb, enc_len); 1672 ap = (struct sadb_alg *) (sp + 1); 1673 1674 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1675 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1676 1677 for (i = 0; ; i++) { 1678 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1679 if (!ealg) 1680 break; 1681 if (!ealg->pfkey_supported) 1682 continue; 1683 if (ealg->available) 1684 *ap++ = ealg->desc; 1685 } 1686 } 1687 1688 out_put_algs: 1689 return skb; 1690 } 1691 1692 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1693 { 1694 struct pfkey_sock *pfk = pfkey_sk(sk); 1695 struct sk_buff *supp_skb; 1696 1697 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1698 return -EINVAL; 1699 1700 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1701 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1702 return -EEXIST; 1703 pfk->registered |= (1<<hdr->sadb_msg_satype); 1704 } 1705 1706 xfrm_probe_algs(); 1707 1708 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1709 if (!supp_skb) { 1710 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1711 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1712 1713 return -ENOBUFS; 1714 } 1715 1716 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1717 sock_net(sk)); 1718 return 0; 1719 } 1720 1721 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1722 { 1723 struct sk_buff *skb; 1724 struct sadb_msg *hdr; 1725 1726 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1727 if (!skb) 1728 return -ENOBUFS; 1729 1730 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1731 hdr->sadb_msg_errno = (uint8_t) 0; 1732 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1733 1734 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1735 sock_net(sk)); 1736 } 1737 1738 static int key_notify_sa_flush(const struct km_event *c) 1739 { 1740 struct sk_buff *skb; 1741 struct sadb_msg *hdr; 1742 1743 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1744 if (!skb) 1745 return -ENOBUFS; 1746 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1747 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1748 hdr->sadb_msg_type = SADB_FLUSH; 1749 hdr->sadb_msg_seq = c->seq; 1750 hdr->sadb_msg_pid = c->portid; 1751 hdr->sadb_msg_version = PF_KEY_V2; 1752 hdr->sadb_msg_errno = (uint8_t) 0; 1753 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1754 hdr->sadb_msg_reserved = 0; 1755 1756 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1757 1758 return 0; 1759 } 1760 1761 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1762 { 1763 struct net *net = sock_net(sk); 1764 unsigned int proto; 1765 struct km_event c; 1766 int err, err2; 1767 1768 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1769 if (proto == 0) 1770 return -EINVAL; 1771 1772 err = xfrm_state_flush(net, proto, true, false); 1773 err2 = unicast_flush_resp(sk, hdr); 1774 if (err || err2) { 1775 if (err == -ESRCH) /* empty table - go quietly */ 1776 err = 0; 1777 return err ? err : err2; 1778 } 1779 1780 c.data.proto = proto; 1781 c.seq = hdr->sadb_msg_seq; 1782 c.portid = hdr->sadb_msg_pid; 1783 c.event = XFRM_MSG_FLUSHSA; 1784 c.net = net; 1785 km_state_notify(NULL, &c); 1786 1787 return 0; 1788 } 1789 1790 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1791 { 1792 struct pfkey_sock *pfk = ptr; 1793 struct sk_buff *out_skb; 1794 struct sadb_msg *out_hdr; 1795 1796 if (!pfkey_can_dump(&pfk->sk)) 1797 return -ENOBUFS; 1798 1799 out_skb = pfkey_xfrm_state2msg(x); 1800 if (IS_ERR(out_skb)) 1801 return PTR_ERR(out_skb); 1802 1803 out_hdr = (struct sadb_msg *) out_skb->data; 1804 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1805 out_hdr->sadb_msg_type = SADB_DUMP; 1806 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1807 out_hdr->sadb_msg_errno = 0; 1808 out_hdr->sadb_msg_reserved = 0; 1809 out_hdr->sadb_msg_seq = count + 1; 1810 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1811 1812 if (pfk->dump.skb) 1813 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1814 &pfk->sk, sock_net(&pfk->sk)); 1815 pfk->dump.skb = out_skb; 1816 1817 return 0; 1818 } 1819 1820 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1821 { 1822 struct net *net = sock_net(&pfk->sk); 1823 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1824 } 1825 1826 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1827 { 1828 struct net *net = sock_net(&pfk->sk); 1829 1830 xfrm_state_walk_done(&pfk->dump.u.state, net); 1831 } 1832 1833 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1834 { 1835 u8 proto; 1836 struct xfrm_address_filter *filter = NULL; 1837 struct pfkey_sock *pfk = pfkey_sk(sk); 1838 1839 mutex_lock(&pfk->dump_lock); 1840 if (pfk->dump.dump != NULL) { 1841 mutex_unlock(&pfk->dump_lock); 1842 return -EBUSY; 1843 } 1844 1845 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1846 if (proto == 0) { 1847 mutex_unlock(&pfk->dump_lock); 1848 return -EINVAL; 1849 } 1850 1851 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1852 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1853 1854 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1855 if (filter == NULL) { 1856 mutex_unlock(&pfk->dump_lock); 1857 return -ENOMEM; 1858 } 1859 1860 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1861 sizeof(xfrm_address_t)); 1862 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1863 sizeof(xfrm_address_t)); 1864 filter->family = xfilter->sadb_x_filter_family; 1865 filter->splen = xfilter->sadb_x_filter_splen; 1866 filter->dplen = xfilter->sadb_x_filter_dplen; 1867 } 1868 1869 pfk->dump.msg_version = hdr->sadb_msg_version; 1870 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1871 pfk->dump.dump = pfkey_dump_sa; 1872 pfk->dump.done = pfkey_dump_sa_done; 1873 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1874 mutex_unlock(&pfk->dump_lock); 1875 1876 return pfkey_do_dump(pfk); 1877 } 1878 1879 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1880 { 1881 struct pfkey_sock *pfk = pfkey_sk(sk); 1882 int satype = hdr->sadb_msg_satype; 1883 bool reset_errno = false; 1884 1885 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1886 reset_errno = true; 1887 if (satype != 0 && satype != 1) 1888 return -EINVAL; 1889 pfk->promisc = satype; 1890 } 1891 if (reset_errno && skb_cloned(skb)) 1892 skb = skb_copy(skb, GFP_KERNEL); 1893 else 1894 skb = skb_clone(skb, GFP_KERNEL); 1895 1896 if (reset_errno && skb) { 1897 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1898 new_hdr->sadb_msg_errno = 0; 1899 } 1900 1901 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1902 return 0; 1903 } 1904 1905 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1906 { 1907 int i; 1908 u32 reqid = *(u32*)ptr; 1909 1910 for (i=0; i<xp->xfrm_nr; i++) { 1911 if (xp->xfrm_vec[i].reqid == reqid) 1912 return -EEXIST; 1913 } 1914 return 0; 1915 } 1916 1917 static u32 gen_reqid(struct net *net) 1918 { 1919 struct xfrm_policy_walk walk; 1920 u32 start; 1921 int rc; 1922 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1923 1924 start = reqid; 1925 do { 1926 ++reqid; 1927 if (reqid == 0) 1928 reqid = IPSEC_MANUAL_REQID_MAX+1; 1929 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1930 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1931 xfrm_policy_walk_done(&walk, net); 1932 if (rc != -EEXIST) 1933 return reqid; 1934 } while (reqid != start); 1935 return 0; 1936 } 1937 1938 static int 1939 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1940 { 1941 struct net *net = xp_net(xp); 1942 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1943 int mode; 1944 1945 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1946 return -ELOOP; 1947 1948 if (rq->sadb_x_ipsecrequest_mode == 0) 1949 return -EINVAL; 1950 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1951 return -EINVAL; 1952 1953 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1954 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1955 return -EINVAL; 1956 t->mode = mode; 1957 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1958 t->optional = 1; 1959 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1960 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1961 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1962 t->reqid = 0; 1963 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1964 return -ENOBUFS; 1965 } 1966 1967 /* addresses present only in tunnel mode */ 1968 if (t->mode == XFRM_MODE_TUNNEL) { 1969 int err; 1970 1971 err = parse_sockaddr_pair( 1972 (struct sockaddr *)(rq + 1), 1973 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1974 &t->saddr, &t->id.daddr, &t->encap_family); 1975 if (err) 1976 return err; 1977 } else 1978 t->encap_family = xp->family; 1979 1980 /* No way to set this via kame pfkey */ 1981 t->allalgs = 1; 1982 xp->xfrm_nr++; 1983 return 0; 1984 } 1985 1986 static int 1987 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1988 { 1989 int err; 1990 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1991 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1992 1993 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1994 return -EINVAL; 1995 1996 while (len >= sizeof(*rq)) { 1997 if (len < rq->sadb_x_ipsecrequest_len || 1998 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 1999 return -EINVAL; 2000 2001 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2002 return err; 2003 len -= rq->sadb_x_ipsecrequest_len; 2004 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2005 } 2006 return 0; 2007 } 2008 2009 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2010 { 2011 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2012 2013 if (xfrm_ctx) { 2014 int len = sizeof(struct sadb_x_sec_ctx); 2015 len += xfrm_ctx->ctx_len; 2016 return PFKEY_ALIGN8(len); 2017 } 2018 return 0; 2019 } 2020 2021 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2022 { 2023 const struct xfrm_tmpl *t; 2024 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2025 int socklen = 0; 2026 int i; 2027 2028 for (i=0; i<xp->xfrm_nr; i++) { 2029 t = xp->xfrm_vec + i; 2030 socklen += pfkey_sockaddr_len(t->encap_family); 2031 } 2032 2033 return sizeof(struct sadb_msg) + 2034 (sizeof(struct sadb_lifetime) * 3) + 2035 (sizeof(struct sadb_address) * 2) + 2036 (sockaddr_size * 2) + 2037 sizeof(struct sadb_x_policy) + 2038 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2039 (socklen * 2) + 2040 pfkey_xfrm_policy2sec_ctx_size(xp); 2041 } 2042 2043 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2044 { 2045 struct sk_buff *skb; 2046 int size; 2047 2048 size = pfkey_xfrm_policy2msg_size(xp); 2049 2050 skb = alloc_skb(size + 16, GFP_ATOMIC); 2051 if (skb == NULL) 2052 return ERR_PTR(-ENOBUFS); 2053 2054 return skb; 2055 } 2056 2057 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2058 { 2059 struct sadb_msg *hdr; 2060 struct sadb_address *addr; 2061 struct sadb_lifetime *lifetime; 2062 struct sadb_x_policy *pol; 2063 struct sadb_x_sec_ctx *sec_ctx; 2064 struct xfrm_sec_ctx *xfrm_ctx; 2065 int i; 2066 int size; 2067 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2068 int socklen = pfkey_sockaddr_len(xp->family); 2069 2070 size = pfkey_xfrm_policy2msg_size(xp); 2071 2072 /* call should fill header later */ 2073 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2074 memset(hdr, 0, size); /* XXX do we need this ? */ 2075 2076 /* src address */ 2077 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2078 addr->sadb_address_len = 2079 (sizeof(struct sadb_address)+sockaddr_size)/ 2080 sizeof(uint64_t); 2081 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2082 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2083 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2084 addr->sadb_address_reserved = 0; 2085 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2086 xp->selector.sport, 2087 (struct sockaddr *) (addr + 1), 2088 xp->family)) 2089 BUG(); 2090 2091 /* dst address */ 2092 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2093 addr->sadb_address_len = 2094 (sizeof(struct sadb_address)+sockaddr_size)/ 2095 sizeof(uint64_t); 2096 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2097 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2098 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2099 addr->sadb_address_reserved = 0; 2100 2101 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2102 (struct sockaddr *) (addr + 1), 2103 xp->family); 2104 2105 /* hard time */ 2106 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2107 lifetime->sadb_lifetime_len = 2108 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2109 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2110 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2111 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2112 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2113 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2114 /* soft time */ 2115 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2116 lifetime->sadb_lifetime_len = 2117 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2118 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2119 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2120 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2121 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2122 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2123 /* current time */ 2124 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2125 lifetime->sadb_lifetime_len = 2126 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2127 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2128 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2129 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2130 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2131 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2132 2133 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2134 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2135 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2136 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2137 if (xp->action == XFRM_POLICY_ALLOW) { 2138 if (xp->xfrm_nr) 2139 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2140 else 2141 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2142 } 2143 pol->sadb_x_policy_dir = dir+1; 2144 pol->sadb_x_policy_reserved = 0; 2145 pol->sadb_x_policy_id = xp->index; 2146 pol->sadb_x_policy_priority = xp->priority; 2147 2148 for (i=0; i<xp->xfrm_nr; i++) { 2149 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2150 struct sadb_x_ipsecrequest *rq; 2151 int req_size; 2152 int mode; 2153 2154 req_size = sizeof(struct sadb_x_ipsecrequest); 2155 if (t->mode == XFRM_MODE_TUNNEL) { 2156 socklen = pfkey_sockaddr_len(t->encap_family); 2157 req_size += socklen * 2; 2158 } else { 2159 size -= 2*socklen; 2160 } 2161 rq = skb_put(skb, req_size); 2162 pol->sadb_x_policy_len += req_size/8; 2163 memset(rq, 0, sizeof(*rq)); 2164 rq->sadb_x_ipsecrequest_len = req_size; 2165 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2166 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2167 return -EINVAL; 2168 rq->sadb_x_ipsecrequest_mode = mode; 2169 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2170 if (t->reqid) 2171 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2172 if (t->optional) 2173 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2174 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2175 2176 if (t->mode == XFRM_MODE_TUNNEL) { 2177 u8 *sa = (void *)(rq + 1); 2178 pfkey_sockaddr_fill(&t->saddr, 0, 2179 (struct sockaddr *)sa, 2180 t->encap_family); 2181 pfkey_sockaddr_fill(&t->id.daddr, 0, 2182 (struct sockaddr *) (sa + socklen), 2183 t->encap_family); 2184 } 2185 } 2186 2187 /* security context */ 2188 if ((xfrm_ctx = xp->security)) { 2189 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2190 2191 sec_ctx = skb_put(skb, ctx_size); 2192 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2193 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2194 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2195 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2196 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2197 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2198 xfrm_ctx->ctx_len); 2199 } 2200 2201 hdr->sadb_msg_len = size / sizeof(uint64_t); 2202 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2203 2204 return 0; 2205 } 2206 2207 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2208 { 2209 struct sk_buff *out_skb; 2210 struct sadb_msg *out_hdr; 2211 int err; 2212 2213 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2214 if (IS_ERR(out_skb)) 2215 return PTR_ERR(out_skb); 2216 2217 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2218 if (err < 0) { 2219 kfree_skb(out_skb); 2220 return err; 2221 } 2222 2223 out_hdr = (struct sadb_msg *) out_skb->data; 2224 out_hdr->sadb_msg_version = PF_KEY_V2; 2225 2226 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2227 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2228 else 2229 out_hdr->sadb_msg_type = event2poltype(c->event); 2230 out_hdr->sadb_msg_errno = 0; 2231 out_hdr->sadb_msg_seq = c->seq; 2232 out_hdr->sadb_msg_pid = c->portid; 2233 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2234 return 0; 2235 2236 } 2237 2238 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2239 { 2240 struct net *net = sock_net(sk); 2241 int err = 0; 2242 struct sadb_lifetime *lifetime; 2243 struct sadb_address *sa; 2244 struct sadb_x_policy *pol; 2245 struct xfrm_policy *xp; 2246 struct km_event c; 2247 struct sadb_x_sec_ctx *sec_ctx; 2248 2249 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2250 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2251 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2252 return -EINVAL; 2253 2254 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2255 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2256 return -EINVAL; 2257 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2258 return -EINVAL; 2259 2260 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2261 if (xp == NULL) 2262 return -ENOBUFS; 2263 2264 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2265 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2266 xp->priority = pol->sadb_x_policy_priority; 2267 2268 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2269 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2270 xp->selector.family = xp->family; 2271 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2272 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2273 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2274 if (xp->selector.sport) 2275 xp->selector.sport_mask = htons(0xffff); 2276 2277 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2278 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2279 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2280 2281 /* Amusing, we set this twice. KAME apps appear to set same value 2282 * in both addresses. 2283 */ 2284 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2285 2286 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2287 if (xp->selector.dport) 2288 xp->selector.dport_mask = htons(0xffff); 2289 2290 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2291 if (sec_ctx != NULL) { 2292 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2293 2294 if (!uctx) { 2295 err = -ENOBUFS; 2296 goto out; 2297 } 2298 2299 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2300 kfree(uctx); 2301 2302 if (err) 2303 goto out; 2304 } 2305 2306 xp->lft.soft_byte_limit = XFRM_INF; 2307 xp->lft.hard_byte_limit = XFRM_INF; 2308 xp->lft.soft_packet_limit = XFRM_INF; 2309 xp->lft.hard_packet_limit = XFRM_INF; 2310 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2311 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2312 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2313 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2314 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2315 } 2316 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2317 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2318 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2319 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2320 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2321 } 2322 xp->xfrm_nr = 0; 2323 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2324 (err = parse_ipsecrequests(xp, pol)) < 0) 2325 goto out; 2326 2327 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2328 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2329 2330 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2331 2332 if (err) 2333 goto out; 2334 2335 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2336 c.event = XFRM_MSG_UPDPOLICY; 2337 else 2338 c.event = XFRM_MSG_NEWPOLICY; 2339 2340 c.seq = hdr->sadb_msg_seq; 2341 c.portid = hdr->sadb_msg_pid; 2342 2343 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2344 xfrm_pol_put(xp); 2345 return 0; 2346 2347 out: 2348 xp->walk.dead = 1; 2349 xfrm_policy_destroy(xp); 2350 return err; 2351 } 2352 2353 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2354 { 2355 struct net *net = sock_net(sk); 2356 int err; 2357 struct sadb_address *sa; 2358 struct sadb_x_policy *pol; 2359 struct xfrm_policy *xp; 2360 struct xfrm_selector sel; 2361 struct km_event c; 2362 struct sadb_x_sec_ctx *sec_ctx; 2363 struct xfrm_sec_ctx *pol_ctx = NULL; 2364 2365 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2366 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2367 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2368 return -EINVAL; 2369 2370 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2371 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2372 return -EINVAL; 2373 2374 memset(&sel, 0, sizeof(sel)); 2375 2376 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2377 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2378 sel.prefixlen_s = sa->sadb_address_prefixlen; 2379 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2380 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2381 if (sel.sport) 2382 sel.sport_mask = htons(0xffff); 2383 2384 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2385 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2386 sel.prefixlen_d = sa->sadb_address_prefixlen; 2387 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2388 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2389 if (sel.dport) 2390 sel.dport_mask = htons(0xffff); 2391 2392 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2393 if (sec_ctx != NULL) { 2394 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2395 2396 if (!uctx) 2397 return -ENOMEM; 2398 2399 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2400 kfree(uctx); 2401 if (err) 2402 return err; 2403 } 2404 2405 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN, 2406 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2407 1, &err); 2408 security_xfrm_policy_free(pol_ctx); 2409 if (xp == NULL) 2410 return -ENOENT; 2411 2412 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2413 2414 if (err) 2415 goto out; 2416 2417 c.seq = hdr->sadb_msg_seq; 2418 c.portid = hdr->sadb_msg_pid; 2419 c.data.byid = 0; 2420 c.event = XFRM_MSG_DELPOLICY; 2421 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2422 2423 out: 2424 xfrm_pol_put(xp); 2425 return err; 2426 } 2427 2428 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2429 { 2430 int err; 2431 struct sk_buff *out_skb; 2432 struct sadb_msg *out_hdr; 2433 err = 0; 2434 2435 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2436 if (IS_ERR(out_skb)) { 2437 err = PTR_ERR(out_skb); 2438 goto out; 2439 } 2440 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2441 if (err < 0) 2442 goto out; 2443 2444 out_hdr = (struct sadb_msg *) out_skb->data; 2445 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2446 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2447 out_hdr->sadb_msg_satype = 0; 2448 out_hdr->sadb_msg_errno = 0; 2449 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2450 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2451 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2452 err = 0; 2453 2454 out: 2455 return err; 2456 } 2457 2458 static int pfkey_sockaddr_pair_size(sa_family_t family) 2459 { 2460 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2461 } 2462 2463 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2464 xfrm_address_t *saddr, xfrm_address_t *daddr, 2465 u16 *family) 2466 { 2467 int af, socklen; 2468 2469 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2470 return -EINVAL; 2471 2472 af = pfkey_sockaddr_extract(sa, saddr); 2473 if (!af) 2474 return -EINVAL; 2475 2476 socklen = pfkey_sockaddr_len(af); 2477 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2478 daddr) != af) 2479 return -EINVAL; 2480 2481 *family = af; 2482 return 0; 2483 } 2484 2485 #ifdef CONFIG_NET_KEY_MIGRATE 2486 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2487 struct xfrm_migrate *m) 2488 { 2489 int err; 2490 struct sadb_x_ipsecrequest *rq2; 2491 int mode; 2492 2493 if (len < sizeof(*rq1) || 2494 len < rq1->sadb_x_ipsecrequest_len || 2495 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2496 return -EINVAL; 2497 2498 /* old endoints */ 2499 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2500 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2501 &m->old_saddr, &m->old_daddr, 2502 &m->old_family); 2503 if (err) 2504 return err; 2505 2506 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2507 len -= rq1->sadb_x_ipsecrequest_len; 2508 2509 if (len <= sizeof(*rq2) || 2510 len < rq2->sadb_x_ipsecrequest_len || 2511 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2512 return -EINVAL; 2513 2514 /* new endpoints */ 2515 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2516 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2517 &m->new_saddr, &m->new_daddr, 2518 &m->new_family); 2519 if (err) 2520 return err; 2521 2522 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2523 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2524 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2525 return -EINVAL; 2526 2527 m->proto = rq1->sadb_x_ipsecrequest_proto; 2528 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2529 return -EINVAL; 2530 m->mode = mode; 2531 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2532 2533 return ((int)(rq1->sadb_x_ipsecrequest_len + 2534 rq2->sadb_x_ipsecrequest_len)); 2535 } 2536 2537 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2538 const struct sadb_msg *hdr, void * const *ext_hdrs) 2539 { 2540 int i, len, ret, err = -EINVAL; 2541 u8 dir; 2542 struct sadb_address *sa; 2543 struct sadb_x_kmaddress *kma; 2544 struct sadb_x_policy *pol; 2545 struct sadb_x_ipsecrequest *rq; 2546 struct xfrm_selector sel; 2547 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2548 struct xfrm_kmaddress k; 2549 struct net *net = sock_net(sk); 2550 2551 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2552 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2553 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2554 err = -EINVAL; 2555 goto out; 2556 } 2557 2558 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2559 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2560 2561 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2562 err = -EINVAL; 2563 goto out; 2564 } 2565 2566 if (kma) { 2567 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2568 k.reserved = kma->sadb_x_kmaddress_reserved; 2569 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2570 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2571 &k.local, &k.remote, &k.family); 2572 if (ret < 0) { 2573 err = ret; 2574 goto out; 2575 } 2576 } 2577 2578 dir = pol->sadb_x_policy_dir - 1; 2579 memset(&sel, 0, sizeof(sel)); 2580 2581 /* set source address info of selector */ 2582 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2583 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2584 sel.prefixlen_s = sa->sadb_address_prefixlen; 2585 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2586 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2587 if (sel.sport) 2588 sel.sport_mask = htons(0xffff); 2589 2590 /* set destination address info of selector */ 2591 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2592 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2593 sel.prefixlen_d = sa->sadb_address_prefixlen; 2594 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2595 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2596 if (sel.dport) 2597 sel.dport_mask = htons(0xffff); 2598 2599 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2600 2601 /* extract ipsecrequests */ 2602 i = 0; 2603 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2604 2605 while (len > 0 && i < XFRM_MAX_DEPTH) { 2606 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2607 if (ret < 0) { 2608 err = ret; 2609 goto out; 2610 } else { 2611 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2612 len -= ret; 2613 i++; 2614 } 2615 } 2616 2617 if (!i || len > 0) { 2618 err = -EINVAL; 2619 goto out; 2620 } 2621 2622 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2623 kma ? &k : NULL, net, NULL); 2624 2625 out: 2626 return err; 2627 } 2628 #else 2629 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2630 const struct sadb_msg *hdr, void * const *ext_hdrs) 2631 { 2632 return -ENOPROTOOPT; 2633 } 2634 #endif 2635 2636 2637 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2638 { 2639 struct net *net = sock_net(sk); 2640 unsigned int dir; 2641 int err = 0, delete; 2642 struct sadb_x_policy *pol; 2643 struct xfrm_policy *xp; 2644 struct km_event c; 2645 2646 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2647 return -EINVAL; 2648 2649 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2650 if (dir >= XFRM_POLICY_MAX) 2651 return -EINVAL; 2652 2653 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2654 xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN, 2655 dir, pol->sadb_x_policy_id, delete, &err); 2656 if (xp == NULL) 2657 return -ENOENT; 2658 2659 if (delete) { 2660 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2661 2662 if (err) 2663 goto out; 2664 c.seq = hdr->sadb_msg_seq; 2665 c.portid = hdr->sadb_msg_pid; 2666 c.data.byid = 1; 2667 c.event = XFRM_MSG_DELPOLICY; 2668 km_policy_notify(xp, dir, &c); 2669 } else { 2670 err = key_pol_get_resp(sk, xp, hdr, dir); 2671 } 2672 2673 out: 2674 xfrm_pol_put(xp); 2675 return err; 2676 } 2677 2678 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2679 { 2680 struct pfkey_sock *pfk = ptr; 2681 struct sk_buff *out_skb; 2682 struct sadb_msg *out_hdr; 2683 int err; 2684 2685 if (!pfkey_can_dump(&pfk->sk)) 2686 return -ENOBUFS; 2687 2688 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2689 if (IS_ERR(out_skb)) 2690 return PTR_ERR(out_skb); 2691 2692 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2693 if (err < 0) 2694 return err; 2695 2696 out_hdr = (struct sadb_msg *) out_skb->data; 2697 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2698 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2699 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2700 out_hdr->sadb_msg_errno = 0; 2701 out_hdr->sadb_msg_seq = count + 1; 2702 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2703 2704 if (pfk->dump.skb) 2705 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2706 &pfk->sk, sock_net(&pfk->sk)); 2707 pfk->dump.skb = out_skb; 2708 2709 return 0; 2710 } 2711 2712 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2713 { 2714 struct net *net = sock_net(&pfk->sk); 2715 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2716 } 2717 2718 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2719 { 2720 struct net *net = sock_net((struct sock *)pfk); 2721 2722 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2723 } 2724 2725 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2726 { 2727 struct pfkey_sock *pfk = pfkey_sk(sk); 2728 2729 mutex_lock(&pfk->dump_lock); 2730 if (pfk->dump.dump != NULL) { 2731 mutex_unlock(&pfk->dump_lock); 2732 return -EBUSY; 2733 } 2734 2735 pfk->dump.msg_version = hdr->sadb_msg_version; 2736 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2737 pfk->dump.dump = pfkey_dump_sp; 2738 pfk->dump.done = pfkey_dump_sp_done; 2739 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2740 mutex_unlock(&pfk->dump_lock); 2741 2742 return pfkey_do_dump(pfk); 2743 } 2744 2745 static int key_notify_policy_flush(const struct km_event *c) 2746 { 2747 struct sk_buff *skb_out; 2748 struct sadb_msg *hdr; 2749 2750 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2751 if (!skb_out) 2752 return -ENOBUFS; 2753 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2754 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2755 hdr->sadb_msg_seq = c->seq; 2756 hdr->sadb_msg_pid = c->portid; 2757 hdr->sadb_msg_version = PF_KEY_V2; 2758 hdr->sadb_msg_errno = (uint8_t) 0; 2759 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2760 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2761 hdr->sadb_msg_reserved = 0; 2762 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2763 return 0; 2764 2765 } 2766 2767 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2768 { 2769 struct net *net = sock_net(sk); 2770 struct km_event c; 2771 int err, err2; 2772 2773 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2774 err2 = unicast_flush_resp(sk, hdr); 2775 if (err || err2) { 2776 if (err == -ESRCH) /* empty table - old silent behavior */ 2777 return 0; 2778 return err; 2779 } 2780 2781 c.data.type = XFRM_POLICY_TYPE_MAIN; 2782 c.event = XFRM_MSG_FLUSHPOLICY; 2783 c.portid = hdr->sadb_msg_pid; 2784 c.seq = hdr->sadb_msg_seq; 2785 c.net = net; 2786 km_policy_notify(NULL, 0, &c); 2787 2788 return 0; 2789 } 2790 2791 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2792 const struct sadb_msg *hdr, void * const *ext_hdrs); 2793 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2794 [SADB_RESERVED] = pfkey_reserved, 2795 [SADB_GETSPI] = pfkey_getspi, 2796 [SADB_UPDATE] = pfkey_add, 2797 [SADB_ADD] = pfkey_add, 2798 [SADB_DELETE] = pfkey_delete, 2799 [SADB_GET] = pfkey_get, 2800 [SADB_ACQUIRE] = pfkey_acquire, 2801 [SADB_REGISTER] = pfkey_register, 2802 [SADB_EXPIRE] = NULL, 2803 [SADB_FLUSH] = pfkey_flush, 2804 [SADB_DUMP] = pfkey_dump, 2805 [SADB_X_PROMISC] = pfkey_promisc, 2806 [SADB_X_PCHANGE] = NULL, 2807 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2808 [SADB_X_SPDADD] = pfkey_spdadd, 2809 [SADB_X_SPDDELETE] = pfkey_spddelete, 2810 [SADB_X_SPDGET] = pfkey_spdget, 2811 [SADB_X_SPDACQUIRE] = NULL, 2812 [SADB_X_SPDDUMP] = pfkey_spddump, 2813 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2814 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2815 [SADB_X_SPDDELETE2] = pfkey_spdget, 2816 [SADB_X_MIGRATE] = pfkey_migrate, 2817 }; 2818 2819 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2820 { 2821 void *ext_hdrs[SADB_EXT_MAX]; 2822 int err; 2823 2824 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2825 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2826 2827 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2828 err = parse_exthdrs(skb, hdr, ext_hdrs); 2829 if (!err) { 2830 err = -EOPNOTSUPP; 2831 if (pfkey_funcs[hdr->sadb_msg_type]) 2832 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2833 } 2834 return err; 2835 } 2836 2837 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2838 { 2839 struct sadb_msg *hdr = NULL; 2840 2841 if (skb->len < sizeof(*hdr)) { 2842 *errp = -EMSGSIZE; 2843 } else { 2844 hdr = (struct sadb_msg *) skb->data; 2845 if (hdr->sadb_msg_version != PF_KEY_V2 || 2846 hdr->sadb_msg_reserved != 0 || 2847 (hdr->sadb_msg_type <= SADB_RESERVED || 2848 hdr->sadb_msg_type > SADB_MAX)) { 2849 hdr = NULL; 2850 *errp = -EINVAL; 2851 } else if (hdr->sadb_msg_len != (skb->len / 2852 sizeof(uint64_t)) || 2853 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2854 sizeof(uint64_t))) { 2855 hdr = NULL; 2856 *errp = -EMSGSIZE; 2857 } else { 2858 *errp = 0; 2859 } 2860 } 2861 return hdr; 2862 } 2863 2864 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2865 const struct xfrm_algo_desc *d) 2866 { 2867 unsigned int id = d->desc.sadb_alg_id; 2868 2869 if (id >= sizeof(t->aalgos) * 8) 2870 return 0; 2871 2872 return (t->aalgos >> id) & 1; 2873 } 2874 2875 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2876 const struct xfrm_algo_desc *d) 2877 { 2878 unsigned int id = d->desc.sadb_alg_id; 2879 2880 if (id >= sizeof(t->ealgos) * 8) 2881 return 0; 2882 2883 return (t->ealgos >> id) & 1; 2884 } 2885 2886 static int count_ah_combs(const struct xfrm_tmpl *t) 2887 { 2888 int i, sz = 0; 2889 2890 for (i = 0; ; i++) { 2891 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2892 if (!aalg) 2893 break; 2894 if (!aalg->pfkey_supported) 2895 continue; 2896 if (aalg_tmpl_set(t, aalg) && aalg->available) 2897 sz += sizeof(struct sadb_comb); 2898 } 2899 return sz + sizeof(struct sadb_prop); 2900 } 2901 2902 static int count_esp_combs(const struct xfrm_tmpl *t) 2903 { 2904 int i, k, sz = 0; 2905 2906 for (i = 0; ; i++) { 2907 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2908 if (!ealg) 2909 break; 2910 2911 if (!ealg->pfkey_supported) 2912 continue; 2913 2914 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2915 continue; 2916 2917 for (k = 1; ; k++) { 2918 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2919 if (!aalg) 2920 break; 2921 2922 if (!aalg->pfkey_supported) 2923 continue; 2924 2925 if (aalg_tmpl_set(t, aalg) && aalg->available) 2926 sz += sizeof(struct sadb_comb); 2927 } 2928 } 2929 return sz + sizeof(struct sadb_prop); 2930 } 2931 2932 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2933 { 2934 struct sadb_prop *p; 2935 int i; 2936 2937 p = skb_put(skb, sizeof(struct sadb_prop)); 2938 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2939 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2940 p->sadb_prop_replay = 32; 2941 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2942 2943 for (i = 0; ; i++) { 2944 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2945 if (!aalg) 2946 break; 2947 2948 if (!aalg->pfkey_supported) 2949 continue; 2950 2951 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2952 struct sadb_comb *c; 2953 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2954 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2955 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2956 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2957 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2958 c->sadb_comb_hard_addtime = 24*60*60; 2959 c->sadb_comb_soft_addtime = 20*60*60; 2960 c->sadb_comb_hard_usetime = 8*60*60; 2961 c->sadb_comb_soft_usetime = 7*60*60; 2962 } 2963 } 2964 } 2965 2966 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2967 { 2968 struct sadb_prop *p; 2969 int i, k; 2970 2971 p = skb_put(skb, sizeof(struct sadb_prop)); 2972 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2973 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2974 p->sadb_prop_replay = 32; 2975 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2976 2977 for (i=0; ; i++) { 2978 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2979 if (!ealg) 2980 break; 2981 2982 if (!ealg->pfkey_supported) 2983 continue; 2984 2985 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2986 continue; 2987 2988 for (k = 1; ; k++) { 2989 struct sadb_comb *c; 2990 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2991 if (!aalg) 2992 break; 2993 if (!aalg->pfkey_supported) 2994 continue; 2995 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2996 continue; 2997 c = skb_put(skb, sizeof(struct sadb_comb)); 2998 memset(c, 0, sizeof(*c)); 2999 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3000 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3001 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3002 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3003 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3004 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3005 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3006 c->sadb_comb_hard_addtime = 24*60*60; 3007 c->sadb_comb_soft_addtime = 20*60*60; 3008 c->sadb_comb_hard_usetime = 8*60*60; 3009 c->sadb_comb_soft_usetime = 7*60*60; 3010 } 3011 } 3012 } 3013 3014 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3015 { 3016 return 0; 3017 } 3018 3019 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3020 { 3021 struct sk_buff *out_skb; 3022 struct sadb_msg *out_hdr; 3023 int hard; 3024 int hsc; 3025 3026 hard = c->data.hard; 3027 if (hard) 3028 hsc = 2; 3029 else 3030 hsc = 1; 3031 3032 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3033 if (IS_ERR(out_skb)) 3034 return PTR_ERR(out_skb); 3035 3036 out_hdr = (struct sadb_msg *) out_skb->data; 3037 out_hdr->sadb_msg_version = PF_KEY_V2; 3038 out_hdr->sadb_msg_type = SADB_EXPIRE; 3039 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3040 out_hdr->sadb_msg_errno = 0; 3041 out_hdr->sadb_msg_reserved = 0; 3042 out_hdr->sadb_msg_seq = 0; 3043 out_hdr->sadb_msg_pid = 0; 3044 3045 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3046 xs_net(x)); 3047 return 0; 3048 } 3049 3050 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3051 { 3052 struct net *net = x ? xs_net(x) : c->net; 3053 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3054 3055 if (atomic_read(&net_pfkey->socks_nr) == 0) 3056 return 0; 3057 3058 switch (c->event) { 3059 case XFRM_MSG_EXPIRE: 3060 return key_notify_sa_expire(x, c); 3061 case XFRM_MSG_DELSA: 3062 case XFRM_MSG_NEWSA: 3063 case XFRM_MSG_UPDSA: 3064 return key_notify_sa(x, c); 3065 case XFRM_MSG_FLUSHSA: 3066 return key_notify_sa_flush(c); 3067 case XFRM_MSG_NEWAE: /* not yet supported */ 3068 break; 3069 default: 3070 pr_err("pfkey: Unknown SA event %d\n", c->event); 3071 break; 3072 } 3073 3074 return 0; 3075 } 3076 3077 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3078 { 3079 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3080 return 0; 3081 3082 switch (c->event) { 3083 case XFRM_MSG_POLEXPIRE: 3084 return key_notify_policy_expire(xp, c); 3085 case XFRM_MSG_DELPOLICY: 3086 case XFRM_MSG_NEWPOLICY: 3087 case XFRM_MSG_UPDPOLICY: 3088 return key_notify_policy(xp, dir, c); 3089 case XFRM_MSG_FLUSHPOLICY: 3090 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3091 break; 3092 return key_notify_policy_flush(c); 3093 default: 3094 pr_err("pfkey: Unknown policy event %d\n", c->event); 3095 break; 3096 } 3097 3098 return 0; 3099 } 3100 3101 static u32 get_acqseq(void) 3102 { 3103 u32 res; 3104 static atomic_t acqseq; 3105 3106 do { 3107 res = atomic_inc_return(&acqseq); 3108 } while (!res); 3109 return res; 3110 } 3111 3112 static bool pfkey_is_alive(const struct km_event *c) 3113 { 3114 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3115 struct sock *sk; 3116 bool is_alive = false; 3117 3118 rcu_read_lock(); 3119 sk_for_each_rcu(sk, &net_pfkey->table) { 3120 if (pfkey_sk(sk)->registered) { 3121 is_alive = true; 3122 break; 3123 } 3124 } 3125 rcu_read_unlock(); 3126 3127 return is_alive; 3128 } 3129 3130 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3131 { 3132 struct sk_buff *skb; 3133 struct sadb_msg *hdr; 3134 struct sadb_address *addr; 3135 struct sadb_x_policy *pol; 3136 int sockaddr_size; 3137 int size; 3138 struct sadb_x_sec_ctx *sec_ctx; 3139 struct xfrm_sec_ctx *xfrm_ctx; 3140 int ctx_size = 0; 3141 3142 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3143 if (!sockaddr_size) 3144 return -EINVAL; 3145 3146 size = sizeof(struct sadb_msg) + 3147 (sizeof(struct sadb_address) * 2) + 3148 (sockaddr_size * 2) + 3149 sizeof(struct sadb_x_policy); 3150 3151 if (x->id.proto == IPPROTO_AH) 3152 size += count_ah_combs(t); 3153 else if (x->id.proto == IPPROTO_ESP) 3154 size += count_esp_combs(t); 3155 3156 if ((xfrm_ctx = x->security)) { 3157 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3158 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3159 } 3160 3161 skb = alloc_skb(size + 16, GFP_ATOMIC); 3162 if (skb == NULL) 3163 return -ENOMEM; 3164 3165 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3166 hdr->sadb_msg_version = PF_KEY_V2; 3167 hdr->sadb_msg_type = SADB_ACQUIRE; 3168 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3169 hdr->sadb_msg_len = size / sizeof(uint64_t); 3170 hdr->sadb_msg_errno = 0; 3171 hdr->sadb_msg_reserved = 0; 3172 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3173 hdr->sadb_msg_pid = 0; 3174 3175 /* src address */ 3176 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3177 addr->sadb_address_len = 3178 (sizeof(struct sadb_address)+sockaddr_size)/ 3179 sizeof(uint64_t); 3180 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3181 addr->sadb_address_proto = 0; 3182 addr->sadb_address_reserved = 0; 3183 addr->sadb_address_prefixlen = 3184 pfkey_sockaddr_fill(&x->props.saddr, 0, 3185 (struct sockaddr *) (addr + 1), 3186 x->props.family); 3187 if (!addr->sadb_address_prefixlen) 3188 BUG(); 3189 3190 /* dst address */ 3191 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3192 addr->sadb_address_len = 3193 (sizeof(struct sadb_address)+sockaddr_size)/ 3194 sizeof(uint64_t); 3195 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3196 addr->sadb_address_proto = 0; 3197 addr->sadb_address_reserved = 0; 3198 addr->sadb_address_prefixlen = 3199 pfkey_sockaddr_fill(&x->id.daddr, 0, 3200 (struct sockaddr *) (addr + 1), 3201 x->props.family); 3202 if (!addr->sadb_address_prefixlen) 3203 BUG(); 3204 3205 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3206 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3207 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3208 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3209 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3210 pol->sadb_x_policy_reserved = 0; 3211 pol->sadb_x_policy_id = xp->index; 3212 pol->sadb_x_policy_priority = xp->priority; 3213 3214 /* Set sadb_comb's. */ 3215 if (x->id.proto == IPPROTO_AH) 3216 dump_ah_combs(skb, t); 3217 else if (x->id.proto == IPPROTO_ESP) 3218 dump_esp_combs(skb, t); 3219 3220 /* security context */ 3221 if (xfrm_ctx) { 3222 sec_ctx = skb_put(skb, 3223 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3224 sec_ctx->sadb_x_sec_len = 3225 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3226 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3227 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3228 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3229 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3230 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3231 xfrm_ctx->ctx_len); 3232 } 3233 3234 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3235 xs_net(x)); 3236 } 3237 3238 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3239 u8 *data, int len, int *dir) 3240 { 3241 struct net *net = sock_net(sk); 3242 struct xfrm_policy *xp; 3243 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3244 struct sadb_x_sec_ctx *sec_ctx; 3245 3246 switch (sk->sk_family) { 3247 case AF_INET: 3248 if (opt != IP_IPSEC_POLICY) { 3249 *dir = -EOPNOTSUPP; 3250 return NULL; 3251 } 3252 break; 3253 #if IS_ENABLED(CONFIG_IPV6) 3254 case AF_INET6: 3255 if (opt != IPV6_IPSEC_POLICY) { 3256 *dir = -EOPNOTSUPP; 3257 return NULL; 3258 } 3259 break; 3260 #endif 3261 default: 3262 *dir = -EINVAL; 3263 return NULL; 3264 } 3265 3266 *dir = -EINVAL; 3267 3268 if (len < sizeof(struct sadb_x_policy) || 3269 pol->sadb_x_policy_len*8 > len || 3270 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3271 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3272 return NULL; 3273 3274 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3275 if (xp == NULL) { 3276 *dir = -ENOBUFS; 3277 return NULL; 3278 } 3279 3280 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3281 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3282 3283 xp->lft.soft_byte_limit = XFRM_INF; 3284 xp->lft.hard_byte_limit = XFRM_INF; 3285 xp->lft.soft_packet_limit = XFRM_INF; 3286 xp->lft.hard_packet_limit = XFRM_INF; 3287 xp->family = sk->sk_family; 3288 3289 xp->xfrm_nr = 0; 3290 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3291 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3292 goto out; 3293 3294 /* security context too */ 3295 if (len >= (pol->sadb_x_policy_len*8 + 3296 sizeof(struct sadb_x_sec_ctx))) { 3297 char *p = (char *)pol; 3298 struct xfrm_user_sec_ctx *uctx; 3299 3300 p += pol->sadb_x_policy_len*8; 3301 sec_ctx = (struct sadb_x_sec_ctx *)p; 3302 if (len < pol->sadb_x_policy_len*8 + 3303 sec_ctx->sadb_x_sec_len*8) { 3304 *dir = -EINVAL; 3305 goto out; 3306 } 3307 if ((*dir = verify_sec_ctx_len(p))) 3308 goto out; 3309 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3310 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3311 kfree(uctx); 3312 3313 if (*dir) 3314 goto out; 3315 } 3316 3317 *dir = pol->sadb_x_policy_dir-1; 3318 return xp; 3319 3320 out: 3321 xp->walk.dead = 1; 3322 xfrm_policy_destroy(xp); 3323 return NULL; 3324 } 3325 3326 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3327 { 3328 struct sk_buff *skb; 3329 struct sadb_msg *hdr; 3330 struct sadb_sa *sa; 3331 struct sadb_address *addr; 3332 struct sadb_x_nat_t_port *n_port; 3333 int sockaddr_size; 3334 int size; 3335 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3336 struct xfrm_encap_tmpl *natt = NULL; 3337 3338 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3339 if (!sockaddr_size) 3340 return -EINVAL; 3341 3342 if (!satype) 3343 return -EINVAL; 3344 3345 if (!x->encap) 3346 return -EINVAL; 3347 3348 natt = x->encap; 3349 3350 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3351 * 3352 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3353 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3354 */ 3355 3356 size = sizeof(struct sadb_msg) + 3357 sizeof(struct sadb_sa) + 3358 (sizeof(struct sadb_address) * 2) + 3359 (sockaddr_size * 2) + 3360 (sizeof(struct sadb_x_nat_t_port) * 2); 3361 3362 skb = alloc_skb(size + 16, GFP_ATOMIC); 3363 if (skb == NULL) 3364 return -ENOMEM; 3365 3366 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3367 hdr->sadb_msg_version = PF_KEY_V2; 3368 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3369 hdr->sadb_msg_satype = satype; 3370 hdr->sadb_msg_len = size / sizeof(uint64_t); 3371 hdr->sadb_msg_errno = 0; 3372 hdr->sadb_msg_reserved = 0; 3373 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3374 hdr->sadb_msg_pid = 0; 3375 3376 /* SA */ 3377 sa = skb_put(skb, sizeof(struct sadb_sa)); 3378 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3379 sa->sadb_sa_exttype = SADB_EXT_SA; 3380 sa->sadb_sa_spi = x->id.spi; 3381 sa->sadb_sa_replay = 0; 3382 sa->sadb_sa_state = 0; 3383 sa->sadb_sa_auth = 0; 3384 sa->sadb_sa_encrypt = 0; 3385 sa->sadb_sa_flags = 0; 3386 3387 /* ADDRESS_SRC (old addr) */ 3388 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3389 addr->sadb_address_len = 3390 (sizeof(struct sadb_address)+sockaddr_size)/ 3391 sizeof(uint64_t); 3392 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3393 addr->sadb_address_proto = 0; 3394 addr->sadb_address_reserved = 0; 3395 addr->sadb_address_prefixlen = 3396 pfkey_sockaddr_fill(&x->props.saddr, 0, 3397 (struct sockaddr *) (addr + 1), 3398 x->props.family); 3399 if (!addr->sadb_address_prefixlen) 3400 BUG(); 3401 3402 /* NAT_T_SPORT (old port) */ 3403 n_port = skb_put(skb, sizeof(*n_port)); 3404 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3405 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3406 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3407 n_port->sadb_x_nat_t_port_reserved = 0; 3408 3409 /* ADDRESS_DST (new addr) */ 3410 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3411 addr->sadb_address_len = 3412 (sizeof(struct sadb_address)+sockaddr_size)/ 3413 sizeof(uint64_t); 3414 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3415 addr->sadb_address_proto = 0; 3416 addr->sadb_address_reserved = 0; 3417 addr->sadb_address_prefixlen = 3418 pfkey_sockaddr_fill(ipaddr, 0, 3419 (struct sockaddr *) (addr + 1), 3420 x->props.family); 3421 if (!addr->sadb_address_prefixlen) 3422 BUG(); 3423 3424 /* NAT_T_DPORT (new port) */ 3425 n_port = skb_put(skb, sizeof(*n_port)); 3426 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3427 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3428 n_port->sadb_x_nat_t_port_port = sport; 3429 n_port->sadb_x_nat_t_port_reserved = 0; 3430 3431 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3432 xs_net(x)); 3433 } 3434 3435 #ifdef CONFIG_NET_KEY_MIGRATE 3436 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3437 const struct xfrm_selector *sel) 3438 { 3439 struct sadb_address *addr; 3440 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3441 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3442 addr->sadb_address_exttype = type; 3443 addr->sadb_address_proto = sel->proto; 3444 addr->sadb_address_reserved = 0; 3445 3446 switch (type) { 3447 case SADB_EXT_ADDRESS_SRC: 3448 addr->sadb_address_prefixlen = sel->prefixlen_s; 3449 pfkey_sockaddr_fill(&sel->saddr, 0, 3450 (struct sockaddr *)(addr + 1), 3451 sel->family); 3452 break; 3453 case SADB_EXT_ADDRESS_DST: 3454 addr->sadb_address_prefixlen = sel->prefixlen_d; 3455 pfkey_sockaddr_fill(&sel->daddr, 0, 3456 (struct sockaddr *)(addr + 1), 3457 sel->family); 3458 break; 3459 default: 3460 return -EINVAL; 3461 } 3462 3463 return 0; 3464 } 3465 3466 3467 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3468 { 3469 struct sadb_x_kmaddress *kma; 3470 u8 *sa; 3471 int family = k->family; 3472 int socklen = pfkey_sockaddr_len(family); 3473 int size_req; 3474 3475 size_req = (sizeof(struct sadb_x_kmaddress) + 3476 pfkey_sockaddr_pair_size(family)); 3477 3478 kma = skb_put_zero(skb, size_req); 3479 kma->sadb_x_kmaddress_len = size_req / 8; 3480 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3481 kma->sadb_x_kmaddress_reserved = k->reserved; 3482 3483 sa = (u8 *)(kma + 1); 3484 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3485 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3486 return -EINVAL; 3487 3488 return 0; 3489 } 3490 3491 static int set_ipsecrequest(struct sk_buff *skb, 3492 uint8_t proto, uint8_t mode, int level, 3493 uint32_t reqid, uint8_t family, 3494 const xfrm_address_t *src, const xfrm_address_t *dst) 3495 { 3496 struct sadb_x_ipsecrequest *rq; 3497 u8 *sa; 3498 int socklen = pfkey_sockaddr_len(family); 3499 int size_req; 3500 3501 size_req = sizeof(struct sadb_x_ipsecrequest) + 3502 pfkey_sockaddr_pair_size(family); 3503 3504 rq = skb_put_zero(skb, size_req); 3505 rq->sadb_x_ipsecrequest_len = size_req; 3506 rq->sadb_x_ipsecrequest_proto = proto; 3507 rq->sadb_x_ipsecrequest_mode = mode; 3508 rq->sadb_x_ipsecrequest_level = level; 3509 rq->sadb_x_ipsecrequest_reqid = reqid; 3510 3511 sa = (u8 *) (rq + 1); 3512 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3513 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3514 return -EINVAL; 3515 3516 return 0; 3517 } 3518 #endif 3519 3520 #ifdef CONFIG_NET_KEY_MIGRATE 3521 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3522 const struct xfrm_migrate *m, int num_bundles, 3523 const struct xfrm_kmaddress *k, 3524 const struct xfrm_encap_tmpl *encap) 3525 { 3526 int i; 3527 int sasize_sel; 3528 int size = 0; 3529 int size_pol = 0; 3530 struct sk_buff *skb; 3531 struct sadb_msg *hdr; 3532 struct sadb_x_policy *pol; 3533 const struct xfrm_migrate *mp; 3534 3535 if (type != XFRM_POLICY_TYPE_MAIN) 3536 return 0; 3537 3538 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3539 return -EINVAL; 3540 3541 if (k != NULL) { 3542 /* addresses for KM */ 3543 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3544 pfkey_sockaddr_pair_size(k->family)); 3545 } 3546 3547 /* selector */ 3548 sasize_sel = pfkey_sockaddr_size(sel->family); 3549 if (!sasize_sel) 3550 return -EINVAL; 3551 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3552 3553 /* policy info */ 3554 size_pol += sizeof(struct sadb_x_policy); 3555 3556 /* ipsecrequests */ 3557 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3558 /* old locator pair */ 3559 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3560 pfkey_sockaddr_pair_size(mp->old_family); 3561 /* new locator pair */ 3562 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3563 pfkey_sockaddr_pair_size(mp->new_family); 3564 } 3565 3566 size += sizeof(struct sadb_msg) + size_pol; 3567 3568 /* alloc buffer */ 3569 skb = alloc_skb(size, GFP_ATOMIC); 3570 if (skb == NULL) 3571 return -ENOMEM; 3572 3573 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3574 hdr->sadb_msg_version = PF_KEY_V2; 3575 hdr->sadb_msg_type = SADB_X_MIGRATE; 3576 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3577 hdr->sadb_msg_len = size / 8; 3578 hdr->sadb_msg_errno = 0; 3579 hdr->sadb_msg_reserved = 0; 3580 hdr->sadb_msg_seq = 0; 3581 hdr->sadb_msg_pid = 0; 3582 3583 /* Addresses to be used by KM for negotiation, if ext is available */ 3584 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3585 goto err; 3586 3587 /* selector src */ 3588 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3589 3590 /* selector dst */ 3591 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3592 3593 /* policy information */ 3594 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3595 pol->sadb_x_policy_len = size_pol / 8; 3596 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3597 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3598 pol->sadb_x_policy_dir = dir + 1; 3599 pol->sadb_x_policy_reserved = 0; 3600 pol->sadb_x_policy_id = 0; 3601 pol->sadb_x_policy_priority = 0; 3602 3603 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3604 /* old ipsecrequest */ 3605 int mode = pfkey_mode_from_xfrm(mp->mode); 3606 if (mode < 0) 3607 goto err; 3608 if (set_ipsecrequest(skb, mp->proto, mode, 3609 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3610 mp->reqid, mp->old_family, 3611 &mp->old_saddr, &mp->old_daddr) < 0) 3612 goto err; 3613 3614 /* new ipsecrequest */ 3615 if (set_ipsecrequest(skb, mp->proto, mode, 3616 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3617 mp->reqid, mp->new_family, 3618 &mp->new_saddr, &mp->new_daddr) < 0) 3619 goto err; 3620 } 3621 3622 /* broadcast migrate message to sockets */ 3623 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3624 3625 return 0; 3626 3627 err: 3628 kfree_skb(skb); 3629 return -EINVAL; 3630 } 3631 #else 3632 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3633 const struct xfrm_migrate *m, int num_bundles, 3634 const struct xfrm_kmaddress *k, 3635 const struct xfrm_encap_tmpl *encap) 3636 { 3637 return -ENOPROTOOPT; 3638 } 3639 #endif 3640 3641 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3642 { 3643 struct sock *sk = sock->sk; 3644 struct sk_buff *skb = NULL; 3645 struct sadb_msg *hdr = NULL; 3646 int err; 3647 struct net *net = sock_net(sk); 3648 3649 err = -EOPNOTSUPP; 3650 if (msg->msg_flags & MSG_OOB) 3651 goto out; 3652 3653 err = -EMSGSIZE; 3654 if ((unsigned int)len > sk->sk_sndbuf - 32) 3655 goto out; 3656 3657 err = -ENOBUFS; 3658 skb = alloc_skb(len, GFP_KERNEL); 3659 if (skb == NULL) 3660 goto out; 3661 3662 err = -EFAULT; 3663 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3664 goto out; 3665 3666 hdr = pfkey_get_base_msg(skb, &err); 3667 if (!hdr) 3668 goto out; 3669 3670 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3671 err = pfkey_process(sk, skb, hdr); 3672 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3673 3674 out: 3675 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3676 err = 0; 3677 kfree_skb(skb); 3678 3679 return err ? : len; 3680 } 3681 3682 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3683 int flags) 3684 { 3685 struct sock *sk = sock->sk; 3686 struct pfkey_sock *pfk = pfkey_sk(sk); 3687 struct sk_buff *skb; 3688 int copied, err; 3689 3690 err = -EINVAL; 3691 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3692 goto out; 3693 3694 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3695 if (skb == NULL) 3696 goto out; 3697 3698 copied = skb->len; 3699 if (copied > len) { 3700 msg->msg_flags |= MSG_TRUNC; 3701 copied = len; 3702 } 3703 3704 skb_reset_transport_header(skb); 3705 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3706 if (err) 3707 goto out_free; 3708 3709 sock_recv_ts_and_drops(msg, sk, skb); 3710 3711 err = (flags & MSG_TRUNC) ? skb->len : copied; 3712 3713 if (pfk->dump.dump != NULL && 3714 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3715 pfkey_do_dump(pfk); 3716 3717 out_free: 3718 skb_free_datagram(sk, skb); 3719 out: 3720 return err; 3721 } 3722 3723 static const struct proto_ops pfkey_ops = { 3724 .family = PF_KEY, 3725 .owner = THIS_MODULE, 3726 /* Operations that make no sense on pfkey sockets. */ 3727 .bind = sock_no_bind, 3728 .connect = sock_no_connect, 3729 .socketpair = sock_no_socketpair, 3730 .accept = sock_no_accept, 3731 .getname = sock_no_getname, 3732 .ioctl = sock_no_ioctl, 3733 .listen = sock_no_listen, 3734 .shutdown = sock_no_shutdown, 3735 .setsockopt = sock_no_setsockopt, 3736 .getsockopt = sock_no_getsockopt, 3737 .mmap = sock_no_mmap, 3738 .sendpage = sock_no_sendpage, 3739 3740 /* Now the operations that really occur. */ 3741 .release = pfkey_release, 3742 .poll = datagram_poll, 3743 .sendmsg = pfkey_sendmsg, 3744 .recvmsg = pfkey_recvmsg, 3745 }; 3746 3747 static const struct net_proto_family pfkey_family_ops = { 3748 .family = PF_KEY, 3749 .create = pfkey_create, 3750 .owner = THIS_MODULE, 3751 }; 3752 3753 #ifdef CONFIG_PROC_FS 3754 static int pfkey_seq_show(struct seq_file *f, void *v) 3755 { 3756 struct sock *s = sk_entry(v); 3757 3758 if (v == SEQ_START_TOKEN) 3759 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3760 else 3761 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3762 s, 3763 refcount_read(&s->sk_refcnt), 3764 sk_rmem_alloc_get(s), 3765 sk_wmem_alloc_get(s), 3766 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3767 sock_i_ino(s) 3768 ); 3769 return 0; 3770 } 3771 3772 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3773 __acquires(rcu) 3774 { 3775 struct net *net = seq_file_net(f); 3776 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3777 3778 rcu_read_lock(); 3779 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3780 } 3781 3782 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3783 { 3784 struct net *net = seq_file_net(f); 3785 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3786 3787 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3788 } 3789 3790 static void pfkey_seq_stop(struct seq_file *f, void *v) 3791 __releases(rcu) 3792 { 3793 rcu_read_unlock(); 3794 } 3795 3796 static const struct seq_operations pfkey_seq_ops = { 3797 .start = pfkey_seq_start, 3798 .next = pfkey_seq_next, 3799 .stop = pfkey_seq_stop, 3800 .show = pfkey_seq_show, 3801 }; 3802 3803 static int __net_init pfkey_init_proc(struct net *net) 3804 { 3805 struct proc_dir_entry *e; 3806 3807 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3808 sizeof(struct seq_net_private)); 3809 if (e == NULL) 3810 return -ENOMEM; 3811 3812 return 0; 3813 } 3814 3815 static void __net_exit pfkey_exit_proc(struct net *net) 3816 { 3817 remove_proc_entry("pfkey", net->proc_net); 3818 } 3819 #else 3820 static inline int pfkey_init_proc(struct net *net) 3821 { 3822 return 0; 3823 } 3824 3825 static inline void pfkey_exit_proc(struct net *net) 3826 { 3827 } 3828 #endif 3829 3830 static struct xfrm_mgr pfkeyv2_mgr = 3831 { 3832 .notify = pfkey_send_notify, 3833 .acquire = pfkey_send_acquire, 3834 .compile_policy = pfkey_compile_policy, 3835 .new_mapping = pfkey_send_new_mapping, 3836 .notify_policy = pfkey_send_policy_notify, 3837 .migrate = pfkey_send_migrate, 3838 .is_alive = pfkey_is_alive, 3839 }; 3840 3841 static int __net_init pfkey_net_init(struct net *net) 3842 { 3843 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3844 int rv; 3845 3846 INIT_HLIST_HEAD(&net_pfkey->table); 3847 atomic_set(&net_pfkey->socks_nr, 0); 3848 3849 rv = pfkey_init_proc(net); 3850 3851 return rv; 3852 } 3853 3854 static void __net_exit pfkey_net_exit(struct net *net) 3855 { 3856 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3857 3858 pfkey_exit_proc(net); 3859 WARN_ON(!hlist_empty(&net_pfkey->table)); 3860 } 3861 3862 static struct pernet_operations pfkey_net_ops = { 3863 .init = pfkey_net_init, 3864 .exit = pfkey_net_exit, 3865 .id = &pfkey_net_id, 3866 .size = sizeof(struct netns_pfkey), 3867 }; 3868 3869 static void __exit ipsec_pfkey_exit(void) 3870 { 3871 xfrm_unregister_km(&pfkeyv2_mgr); 3872 sock_unregister(PF_KEY); 3873 unregister_pernet_subsys(&pfkey_net_ops); 3874 proto_unregister(&key_proto); 3875 } 3876 3877 static int __init ipsec_pfkey_init(void) 3878 { 3879 int err = proto_register(&key_proto, 0); 3880 3881 if (err != 0) 3882 goto out; 3883 3884 err = register_pernet_subsys(&pfkey_net_ops); 3885 if (err != 0) 3886 goto out_unregister_key_proto; 3887 err = sock_register(&pfkey_family_ops); 3888 if (err != 0) 3889 goto out_unregister_pernet; 3890 err = xfrm_register_km(&pfkeyv2_mgr); 3891 if (err != 0) 3892 goto out_sock_unregister; 3893 out: 3894 return err; 3895 3896 out_sock_unregister: 3897 sock_unregister(PF_KEY); 3898 out_unregister_pernet: 3899 unregister_pernet_subsys(&pfkey_net_ops); 3900 out_unregister_key_proto: 3901 proto_unregister(&key_proto); 3902 goto out; 3903 } 3904 3905 module_init(ipsec_pfkey_init); 3906 module_exit(ipsec_pfkey_exit); 3907 MODULE_LICENSE("GPL"); 3908 MODULE_ALIAS_NETPROTO(PF_KEY); 3909