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 BUG_ON(!addr->sadb_address_prefixlen); 932 933 /* dst address */ 934 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 935 addr->sadb_address_len = 936 (sizeof(struct sadb_address)+sockaddr_size)/ 937 sizeof(uint64_t); 938 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 939 addr->sadb_address_proto = 0; 940 addr->sadb_address_reserved = 0; 941 942 addr->sadb_address_prefixlen = 943 pfkey_sockaddr_fill(&x->id.daddr, 0, 944 (struct sockaddr *) (addr + 1), 945 x->props.family); 946 BUG_ON(!addr->sadb_address_prefixlen); 947 948 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 949 x->props.family)) { 950 addr = skb_put(skb, 951 sizeof(struct sadb_address) + sockaddr_size); 952 addr->sadb_address_len = 953 (sizeof(struct sadb_address)+sockaddr_size)/ 954 sizeof(uint64_t); 955 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 956 addr->sadb_address_proto = 957 pfkey_proto_from_xfrm(x->sel.proto); 958 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 959 addr->sadb_address_reserved = 0; 960 961 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 962 (struct sockaddr *) (addr + 1), 963 x->props.family); 964 } 965 966 /* auth key */ 967 if (add_keys && auth_key_size) { 968 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 969 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 970 sizeof(uint64_t); 971 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 972 key->sadb_key_bits = x->aalg->alg_key_len; 973 key->sadb_key_reserved = 0; 974 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 975 } 976 /* encrypt key */ 977 if (add_keys && encrypt_key_size) { 978 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 979 key->sadb_key_len = (sizeof(struct sadb_key) + 980 encrypt_key_size) / sizeof(uint64_t); 981 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 982 key->sadb_key_bits = x->ealg->alg_key_len; 983 key->sadb_key_reserved = 0; 984 memcpy(key + 1, x->ealg->alg_key, 985 (x->ealg->alg_key_len+7)/8); 986 } 987 988 /* sa */ 989 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 990 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 991 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 992 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 993 kfree_skb(skb); 994 return ERR_PTR(-EINVAL); 995 } 996 sa2->sadb_x_sa2_mode = mode; 997 sa2->sadb_x_sa2_reserved1 = 0; 998 sa2->sadb_x_sa2_reserved2 = 0; 999 sa2->sadb_x_sa2_sequence = 0; 1000 sa2->sadb_x_sa2_reqid = x->props.reqid; 1001 1002 if (natt && natt->encap_type) { 1003 struct sadb_x_nat_t_type *n_type; 1004 struct sadb_x_nat_t_port *n_port; 1005 1006 /* type */ 1007 n_type = skb_put(skb, sizeof(*n_type)); 1008 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1009 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1010 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1011 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1012 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1013 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1014 1015 /* source port */ 1016 n_port = skb_put(skb, sizeof(*n_port)); 1017 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1018 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1019 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1020 n_port->sadb_x_nat_t_port_reserved = 0; 1021 1022 /* dest port */ 1023 n_port = skb_put(skb, sizeof(*n_port)); 1024 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1025 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1026 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1027 n_port->sadb_x_nat_t_port_reserved = 0; 1028 } 1029 1030 /* security context */ 1031 if (xfrm_ctx) { 1032 sec_ctx = skb_put(skb, 1033 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1034 sec_ctx->sadb_x_sec_len = 1035 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1036 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1037 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1038 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1039 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1040 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1041 xfrm_ctx->ctx_len); 1042 } 1043 1044 return skb; 1045 } 1046 1047 1048 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1049 { 1050 struct sk_buff *skb; 1051 1052 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1053 1054 return skb; 1055 } 1056 1057 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1058 int hsc) 1059 { 1060 return __pfkey_xfrm_state2msg(x, 0, hsc); 1061 } 1062 1063 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1064 const struct sadb_msg *hdr, 1065 void * const *ext_hdrs) 1066 { 1067 struct xfrm_state *x; 1068 const struct sadb_lifetime *lifetime; 1069 const struct sadb_sa *sa; 1070 const struct sadb_key *key; 1071 const struct sadb_x_sec_ctx *sec_ctx; 1072 uint16_t proto; 1073 int err; 1074 1075 1076 sa = ext_hdrs[SADB_EXT_SA - 1]; 1077 if (!sa || 1078 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1079 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1080 return ERR_PTR(-EINVAL); 1081 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1082 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1083 return ERR_PTR(-EINVAL); 1084 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1085 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1086 return ERR_PTR(-EINVAL); 1087 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1088 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1089 return ERR_PTR(-EINVAL); 1090 1091 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1092 if (proto == 0) 1093 return ERR_PTR(-EINVAL); 1094 1095 /* default error is no buffer space */ 1096 err = -ENOBUFS; 1097 1098 /* RFC2367: 1099 1100 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1101 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1102 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1103 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1104 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1105 not true. 1106 1107 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1108 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1109 */ 1110 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1111 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1112 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1113 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1114 return ERR_PTR(-EINVAL); 1115 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1116 if (key != NULL && 1117 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1118 key->sadb_key_bits == 0) 1119 return ERR_PTR(-EINVAL); 1120 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1121 if (key != NULL && 1122 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1123 key->sadb_key_bits == 0) 1124 return ERR_PTR(-EINVAL); 1125 1126 x = xfrm_state_alloc(net); 1127 if (x == NULL) 1128 return ERR_PTR(-ENOBUFS); 1129 1130 x->id.proto = proto; 1131 x->id.spi = sa->sadb_sa_spi; 1132 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1133 (sizeof(x->replay.bitmap) * 8)); 1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1135 x->props.flags |= XFRM_STATE_NOECN; 1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1137 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1138 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1139 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1140 1141 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1142 if (lifetime != NULL) { 1143 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1144 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1145 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1146 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1147 } 1148 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1149 if (lifetime != NULL) { 1150 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1151 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1152 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1153 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1154 } 1155 1156 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1157 if (sec_ctx != NULL) { 1158 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1159 1160 if (!uctx) 1161 goto out; 1162 1163 err = security_xfrm_state_alloc(x, uctx); 1164 kfree(uctx); 1165 1166 if (err) 1167 goto out; 1168 } 1169 1170 err = -ENOBUFS; 1171 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1172 if (sa->sadb_sa_auth) { 1173 int keysize = 0; 1174 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1175 if (!a || !a->pfkey_supported) { 1176 err = -ENOSYS; 1177 goto out; 1178 } 1179 if (key) 1180 keysize = (key->sadb_key_bits + 7) / 8; 1181 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1182 if (!x->aalg) { 1183 err = -ENOMEM; 1184 goto out; 1185 } 1186 strcpy(x->aalg->alg_name, a->name); 1187 x->aalg->alg_key_len = 0; 1188 if (key) { 1189 x->aalg->alg_key_len = key->sadb_key_bits; 1190 memcpy(x->aalg->alg_key, key+1, keysize); 1191 } 1192 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1193 x->props.aalgo = sa->sadb_sa_auth; 1194 /* x->algo.flags = sa->sadb_sa_flags; */ 1195 } 1196 if (sa->sadb_sa_encrypt) { 1197 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1198 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1199 if (!a || !a->pfkey_supported) { 1200 err = -ENOSYS; 1201 goto out; 1202 } 1203 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1204 if (!x->calg) { 1205 err = -ENOMEM; 1206 goto out; 1207 } 1208 strcpy(x->calg->alg_name, a->name); 1209 x->props.calgo = sa->sadb_sa_encrypt; 1210 } else { 1211 int keysize = 0; 1212 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1213 if (!a || !a->pfkey_supported) { 1214 err = -ENOSYS; 1215 goto out; 1216 } 1217 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1218 if (key) 1219 keysize = (key->sadb_key_bits + 7) / 8; 1220 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1221 if (!x->ealg) { 1222 err = -ENOMEM; 1223 goto out; 1224 } 1225 strcpy(x->ealg->alg_name, a->name); 1226 x->ealg->alg_key_len = 0; 1227 if (key) { 1228 x->ealg->alg_key_len = key->sadb_key_bits; 1229 memcpy(x->ealg->alg_key, key+1, keysize); 1230 } 1231 x->props.ealgo = sa->sadb_sa_encrypt; 1232 x->geniv = a->uinfo.encr.geniv; 1233 } 1234 } 1235 /* x->algo.flags = sa->sadb_sa_flags; */ 1236 1237 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1238 &x->props.saddr); 1239 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1240 &x->id.daddr); 1241 1242 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1243 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1244 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1245 if (mode < 0) { 1246 err = -EINVAL; 1247 goto out; 1248 } 1249 x->props.mode = mode; 1250 x->props.reqid = sa2->sadb_x_sa2_reqid; 1251 } 1252 1253 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1254 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1255 1256 /* Nobody uses this, but we try. */ 1257 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1258 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1259 } 1260 1261 if (!x->sel.family) 1262 x->sel.family = x->props.family; 1263 1264 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1265 const struct sadb_x_nat_t_type* n_type; 1266 struct xfrm_encap_tmpl *natt; 1267 1268 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1269 if (!x->encap) { 1270 err = -ENOMEM; 1271 goto out; 1272 } 1273 1274 natt = x->encap; 1275 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1276 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1277 1278 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1279 const struct sadb_x_nat_t_port *n_port = 1280 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1281 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1282 } 1283 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1284 const struct sadb_x_nat_t_port *n_port = 1285 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1286 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1287 } 1288 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1289 } 1290 1291 err = xfrm_init_state(x); 1292 if (err) 1293 goto out; 1294 1295 x->km.seq = hdr->sadb_msg_seq; 1296 return x; 1297 1298 out: 1299 x->km.state = XFRM_STATE_DEAD; 1300 xfrm_state_put(x); 1301 return ERR_PTR(err); 1302 } 1303 1304 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1305 { 1306 return -EOPNOTSUPP; 1307 } 1308 1309 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1310 { 1311 struct net *net = sock_net(sk); 1312 struct sk_buff *resp_skb; 1313 struct sadb_x_sa2 *sa2; 1314 struct sadb_address *saddr, *daddr; 1315 struct sadb_msg *out_hdr; 1316 struct sadb_spirange *range; 1317 struct xfrm_state *x = NULL; 1318 int mode; 1319 int err; 1320 u32 min_spi, max_spi; 1321 u32 reqid; 1322 u8 proto; 1323 unsigned short family; 1324 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1325 1326 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1327 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1328 return -EINVAL; 1329 1330 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1331 if (proto == 0) 1332 return -EINVAL; 1333 1334 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1335 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1336 if (mode < 0) 1337 return -EINVAL; 1338 reqid = sa2->sadb_x_sa2_reqid; 1339 } else { 1340 mode = 0; 1341 reqid = 0; 1342 } 1343 1344 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1345 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1346 1347 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1348 switch (family) { 1349 case AF_INET: 1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1352 break; 1353 #if IS_ENABLED(CONFIG_IPV6) 1354 case AF_INET6: 1355 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1356 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1357 break; 1358 #endif 1359 } 1360 1361 if (hdr->sadb_msg_seq) { 1362 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1363 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1364 xfrm_state_put(x); 1365 x = NULL; 1366 } 1367 } 1368 1369 if (!x) 1370 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); 1371 1372 if (x == NULL) 1373 return -ENOENT; 1374 1375 min_spi = 0x100; 1376 max_spi = 0x0fffffff; 1377 1378 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1379 if (range) { 1380 min_spi = range->sadb_spirange_min; 1381 max_spi = range->sadb_spirange_max; 1382 } 1383 1384 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1385 if (err) { 1386 xfrm_state_put(x); 1387 return err; 1388 } 1389 1390 err = xfrm_alloc_spi(x, min_spi, max_spi); 1391 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1392 1393 if (IS_ERR(resp_skb)) { 1394 xfrm_state_put(x); 1395 return PTR_ERR(resp_skb); 1396 } 1397 1398 out_hdr = (struct sadb_msg *) resp_skb->data; 1399 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1400 out_hdr->sadb_msg_type = SADB_GETSPI; 1401 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1402 out_hdr->sadb_msg_errno = 0; 1403 out_hdr->sadb_msg_reserved = 0; 1404 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1405 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1406 1407 xfrm_state_put(x); 1408 1409 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1410 1411 return 0; 1412 } 1413 1414 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1415 { 1416 struct net *net = sock_net(sk); 1417 struct xfrm_state *x; 1418 1419 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1420 return -EOPNOTSUPP; 1421 1422 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1423 return 0; 1424 1425 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1426 if (x == NULL) 1427 return 0; 1428 1429 spin_lock_bh(&x->lock); 1430 if (x->km.state == XFRM_STATE_ACQ) 1431 x->km.state = XFRM_STATE_ERROR; 1432 1433 spin_unlock_bh(&x->lock); 1434 xfrm_state_put(x); 1435 return 0; 1436 } 1437 1438 static inline int event2poltype(int event) 1439 { 1440 switch (event) { 1441 case XFRM_MSG_DELPOLICY: 1442 return SADB_X_SPDDELETE; 1443 case XFRM_MSG_NEWPOLICY: 1444 return SADB_X_SPDADD; 1445 case XFRM_MSG_UPDPOLICY: 1446 return SADB_X_SPDUPDATE; 1447 case XFRM_MSG_POLEXPIRE: 1448 // return SADB_X_SPDEXPIRE; 1449 default: 1450 pr_err("pfkey: Unknown policy event %d\n", event); 1451 break; 1452 } 1453 1454 return 0; 1455 } 1456 1457 static inline int event2keytype(int event) 1458 { 1459 switch (event) { 1460 case XFRM_MSG_DELSA: 1461 return SADB_DELETE; 1462 case XFRM_MSG_NEWSA: 1463 return SADB_ADD; 1464 case XFRM_MSG_UPDSA: 1465 return SADB_UPDATE; 1466 case XFRM_MSG_EXPIRE: 1467 return SADB_EXPIRE; 1468 default: 1469 pr_err("pfkey: Unknown SA event %d\n", event); 1470 break; 1471 } 1472 1473 return 0; 1474 } 1475 1476 /* ADD/UPD/DEL */ 1477 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1478 { 1479 struct sk_buff *skb; 1480 struct sadb_msg *hdr; 1481 1482 skb = pfkey_xfrm_state2msg(x); 1483 1484 if (IS_ERR(skb)) 1485 return PTR_ERR(skb); 1486 1487 hdr = (struct sadb_msg *) skb->data; 1488 hdr->sadb_msg_version = PF_KEY_V2; 1489 hdr->sadb_msg_type = event2keytype(c->event); 1490 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1491 hdr->sadb_msg_errno = 0; 1492 hdr->sadb_msg_reserved = 0; 1493 hdr->sadb_msg_seq = c->seq; 1494 hdr->sadb_msg_pid = c->portid; 1495 1496 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1497 1498 return 0; 1499 } 1500 1501 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1502 { 1503 struct net *net = sock_net(sk); 1504 struct xfrm_state *x; 1505 int err; 1506 struct km_event c; 1507 1508 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1509 if (IS_ERR(x)) 1510 return PTR_ERR(x); 1511 1512 xfrm_state_hold(x); 1513 if (hdr->sadb_msg_type == SADB_ADD) 1514 err = xfrm_state_add(x); 1515 else 1516 err = xfrm_state_update(x); 1517 1518 xfrm_audit_state_add(x, err ? 0 : 1, true); 1519 1520 if (err < 0) { 1521 x->km.state = XFRM_STATE_DEAD; 1522 __xfrm_state_put(x); 1523 goto out; 1524 } 1525 1526 if (hdr->sadb_msg_type == SADB_ADD) 1527 c.event = XFRM_MSG_NEWSA; 1528 else 1529 c.event = XFRM_MSG_UPDSA; 1530 c.seq = hdr->sadb_msg_seq; 1531 c.portid = hdr->sadb_msg_pid; 1532 km_state_notify(x, &c); 1533 out: 1534 xfrm_state_put(x); 1535 return err; 1536 } 1537 1538 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1539 { 1540 struct net *net = sock_net(sk); 1541 struct xfrm_state *x; 1542 struct km_event c; 1543 int err; 1544 1545 if (!ext_hdrs[SADB_EXT_SA-1] || 1546 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1547 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1548 return -EINVAL; 1549 1550 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1551 if (x == NULL) 1552 return -ESRCH; 1553 1554 if ((err = security_xfrm_state_delete(x))) 1555 goto out; 1556 1557 if (xfrm_state_kern(x)) { 1558 err = -EPERM; 1559 goto out; 1560 } 1561 1562 err = xfrm_state_delete(x); 1563 1564 if (err < 0) 1565 goto out; 1566 1567 c.seq = hdr->sadb_msg_seq; 1568 c.portid = hdr->sadb_msg_pid; 1569 c.event = XFRM_MSG_DELSA; 1570 km_state_notify(x, &c); 1571 out: 1572 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1573 xfrm_state_put(x); 1574 1575 return err; 1576 } 1577 1578 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1579 { 1580 struct net *net = sock_net(sk); 1581 __u8 proto; 1582 struct sk_buff *out_skb; 1583 struct sadb_msg *out_hdr; 1584 struct xfrm_state *x; 1585 1586 if (!ext_hdrs[SADB_EXT_SA-1] || 1587 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1588 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1589 return -EINVAL; 1590 1591 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1592 if (x == NULL) 1593 return -ESRCH; 1594 1595 out_skb = pfkey_xfrm_state2msg(x); 1596 proto = x->id.proto; 1597 xfrm_state_put(x); 1598 if (IS_ERR(out_skb)) 1599 return PTR_ERR(out_skb); 1600 1601 out_hdr = (struct sadb_msg *) out_skb->data; 1602 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1603 out_hdr->sadb_msg_type = SADB_GET; 1604 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1605 out_hdr->sadb_msg_errno = 0; 1606 out_hdr->sadb_msg_reserved = 0; 1607 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1608 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1609 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1610 1611 return 0; 1612 } 1613 1614 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1615 gfp_t allocation) 1616 { 1617 struct sk_buff *skb; 1618 struct sadb_msg *hdr; 1619 int len, auth_len, enc_len, i; 1620 1621 auth_len = xfrm_count_pfkey_auth_supported(); 1622 if (auth_len) { 1623 auth_len *= sizeof(struct sadb_alg); 1624 auth_len += sizeof(struct sadb_supported); 1625 } 1626 1627 enc_len = xfrm_count_pfkey_enc_supported(); 1628 if (enc_len) { 1629 enc_len *= sizeof(struct sadb_alg); 1630 enc_len += sizeof(struct sadb_supported); 1631 } 1632 1633 len = enc_len + auth_len + sizeof(struct sadb_msg); 1634 1635 skb = alloc_skb(len + 16, allocation); 1636 if (!skb) 1637 goto out_put_algs; 1638 1639 hdr = skb_put(skb, sizeof(*hdr)); 1640 pfkey_hdr_dup(hdr, orig); 1641 hdr->sadb_msg_errno = 0; 1642 hdr->sadb_msg_len = len / sizeof(uint64_t); 1643 1644 if (auth_len) { 1645 struct sadb_supported *sp; 1646 struct sadb_alg *ap; 1647 1648 sp = skb_put(skb, auth_len); 1649 ap = (struct sadb_alg *) (sp + 1); 1650 1651 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1652 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1653 1654 for (i = 0; ; i++) { 1655 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1656 if (!aalg) 1657 break; 1658 if (!aalg->pfkey_supported) 1659 continue; 1660 if (aalg->available) 1661 *ap++ = aalg->desc; 1662 } 1663 } 1664 1665 if (enc_len) { 1666 struct sadb_supported *sp; 1667 struct sadb_alg *ap; 1668 1669 sp = skb_put(skb, enc_len); 1670 ap = (struct sadb_alg *) (sp + 1); 1671 1672 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1673 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1674 1675 for (i = 0; ; i++) { 1676 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1677 if (!ealg) 1678 break; 1679 if (!ealg->pfkey_supported) 1680 continue; 1681 if (ealg->available) 1682 *ap++ = ealg->desc; 1683 } 1684 } 1685 1686 out_put_algs: 1687 return skb; 1688 } 1689 1690 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1691 { 1692 struct pfkey_sock *pfk = pfkey_sk(sk); 1693 struct sk_buff *supp_skb; 1694 1695 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1696 return -EINVAL; 1697 1698 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1699 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1700 return -EEXIST; 1701 pfk->registered |= (1<<hdr->sadb_msg_satype); 1702 } 1703 1704 xfrm_probe_algs(); 1705 1706 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1707 if (!supp_skb) { 1708 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1709 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1710 1711 return -ENOBUFS; 1712 } 1713 1714 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1715 sock_net(sk)); 1716 return 0; 1717 } 1718 1719 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1720 { 1721 struct sk_buff *skb; 1722 struct sadb_msg *hdr; 1723 1724 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1725 if (!skb) 1726 return -ENOBUFS; 1727 1728 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1729 hdr->sadb_msg_errno = (uint8_t) 0; 1730 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1731 1732 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1733 sock_net(sk)); 1734 } 1735 1736 static int key_notify_sa_flush(const struct km_event *c) 1737 { 1738 struct sk_buff *skb; 1739 struct sadb_msg *hdr; 1740 1741 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1742 if (!skb) 1743 return -ENOBUFS; 1744 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1745 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1746 hdr->sadb_msg_type = SADB_FLUSH; 1747 hdr->sadb_msg_seq = c->seq; 1748 hdr->sadb_msg_pid = c->portid; 1749 hdr->sadb_msg_version = PF_KEY_V2; 1750 hdr->sadb_msg_errno = (uint8_t) 0; 1751 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1752 hdr->sadb_msg_reserved = 0; 1753 1754 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1755 1756 return 0; 1757 } 1758 1759 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1760 { 1761 struct net *net = sock_net(sk); 1762 unsigned int proto; 1763 struct km_event c; 1764 int err, err2; 1765 1766 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1767 if (proto == 0) 1768 return -EINVAL; 1769 1770 err = xfrm_state_flush(net, proto, true, false); 1771 err2 = unicast_flush_resp(sk, hdr); 1772 if (err || err2) { 1773 if (err == -ESRCH) /* empty table - go quietly */ 1774 err = 0; 1775 return err ? err : err2; 1776 } 1777 1778 c.data.proto = proto; 1779 c.seq = hdr->sadb_msg_seq; 1780 c.portid = hdr->sadb_msg_pid; 1781 c.event = XFRM_MSG_FLUSHSA; 1782 c.net = net; 1783 km_state_notify(NULL, &c); 1784 1785 return 0; 1786 } 1787 1788 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1789 { 1790 struct pfkey_sock *pfk = ptr; 1791 struct sk_buff *out_skb; 1792 struct sadb_msg *out_hdr; 1793 1794 if (!pfkey_can_dump(&pfk->sk)) 1795 return -ENOBUFS; 1796 1797 out_skb = pfkey_xfrm_state2msg(x); 1798 if (IS_ERR(out_skb)) 1799 return PTR_ERR(out_skb); 1800 1801 out_hdr = (struct sadb_msg *) out_skb->data; 1802 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1803 out_hdr->sadb_msg_type = SADB_DUMP; 1804 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1805 out_hdr->sadb_msg_errno = 0; 1806 out_hdr->sadb_msg_reserved = 0; 1807 out_hdr->sadb_msg_seq = count + 1; 1808 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1809 1810 if (pfk->dump.skb) 1811 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1812 &pfk->sk, sock_net(&pfk->sk)); 1813 pfk->dump.skb = out_skb; 1814 1815 return 0; 1816 } 1817 1818 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1819 { 1820 struct net *net = sock_net(&pfk->sk); 1821 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1822 } 1823 1824 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1825 { 1826 struct net *net = sock_net(&pfk->sk); 1827 1828 xfrm_state_walk_done(&pfk->dump.u.state, net); 1829 } 1830 1831 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1832 { 1833 u8 proto; 1834 struct xfrm_address_filter *filter = NULL; 1835 struct pfkey_sock *pfk = pfkey_sk(sk); 1836 1837 mutex_lock(&pfk->dump_lock); 1838 if (pfk->dump.dump != NULL) { 1839 mutex_unlock(&pfk->dump_lock); 1840 return -EBUSY; 1841 } 1842 1843 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1844 if (proto == 0) { 1845 mutex_unlock(&pfk->dump_lock); 1846 return -EINVAL; 1847 } 1848 1849 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1850 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1851 1852 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1853 if (filter == NULL) { 1854 mutex_unlock(&pfk->dump_lock); 1855 return -ENOMEM; 1856 } 1857 1858 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1859 sizeof(xfrm_address_t)); 1860 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1861 sizeof(xfrm_address_t)); 1862 filter->family = xfilter->sadb_x_filter_family; 1863 filter->splen = xfilter->sadb_x_filter_splen; 1864 filter->dplen = xfilter->sadb_x_filter_dplen; 1865 } 1866 1867 pfk->dump.msg_version = hdr->sadb_msg_version; 1868 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1869 pfk->dump.dump = pfkey_dump_sa; 1870 pfk->dump.done = pfkey_dump_sa_done; 1871 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1872 mutex_unlock(&pfk->dump_lock); 1873 1874 return pfkey_do_dump(pfk); 1875 } 1876 1877 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1878 { 1879 struct pfkey_sock *pfk = pfkey_sk(sk); 1880 int satype = hdr->sadb_msg_satype; 1881 bool reset_errno = false; 1882 1883 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1884 reset_errno = true; 1885 if (satype != 0 && satype != 1) 1886 return -EINVAL; 1887 pfk->promisc = satype; 1888 } 1889 if (reset_errno && skb_cloned(skb)) 1890 skb = skb_copy(skb, GFP_KERNEL); 1891 else 1892 skb = skb_clone(skb, GFP_KERNEL); 1893 1894 if (reset_errno && skb) { 1895 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1896 new_hdr->sadb_msg_errno = 0; 1897 } 1898 1899 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1900 return 0; 1901 } 1902 1903 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1904 { 1905 int i; 1906 u32 reqid = *(u32*)ptr; 1907 1908 for (i=0; i<xp->xfrm_nr; i++) { 1909 if (xp->xfrm_vec[i].reqid == reqid) 1910 return -EEXIST; 1911 } 1912 return 0; 1913 } 1914 1915 static u32 gen_reqid(struct net *net) 1916 { 1917 struct xfrm_policy_walk walk; 1918 u32 start; 1919 int rc; 1920 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1921 1922 start = reqid; 1923 do { 1924 ++reqid; 1925 if (reqid == 0) 1926 reqid = IPSEC_MANUAL_REQID_MAX+1; 1927 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1928 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1929 xfrm_policy_walk_done(&walk, net); 1930 if (rc != -EEXIST) 1931 return reqid; 1932 } while (reqid != start); 1933 return 0; 1934 } 1935 1936 static int 1937 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1938 { 1939 struct net *net = xp_net(xp); 1940 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1941 int mode; 1942 1943 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1944 return -ELOOP; 1945 1946 if (rq->sadb_x_ipsecrequest_mode == 0) 1947 return -EINVAL; 1948 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1949 return -EINVAL; 1950 1951 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1952 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1953 return -EINVAL; 1954 t->mode = mode; 1955 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1956 t->optional = 1; 1957 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1958 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1959 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1960 t->reqid = 0; 1961 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1962 return -ENOBUFS; 1963 } 1964 1965 /* addresses present only in tunnel mode */ 1966 if (t->mode == XFRM_MODE_TUNNEL) { 1967 int err; 1968 1969 err = parse_sockaddr_pair( 1970 (struct sockaddr *)(rq + 1), 1971 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1972 &t->saddr, &t->id.daddr, &t->encap_family); 1973 if (err) 1974 return err; 1975 } else 1976 t->encap_family = xp->family; 1977 1978 /* No way to set this via kame pfkey */ 1979 t->allalgs = 1; 1980 xp->xfrm_nr++; 1981 return 0; 1982 } 1983 1984 static int 1985 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1986 { 1987 int err; 1988 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1989 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1990 1991 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1992 return -EINVAL; 1993 1994 while (len >= sizeof(*rq)) { 1995 if (len < rq->sadb_x_ipsecrequest_len || 1996 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 1997 return -EINVAL; 1998 1999 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2000 return err; 2001 len -= rq->sadb_x_ipsecrequest_len; 2002 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2003 } 2004 return 0; 2005 } 2006 2007 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2008 { 2009 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2010 2011 if (xfrm_ctx) { 2012 int len = sizeof(struct sadb_x_sec_ctx); 2013 len += xfrm_ctx->ctx_len; 2014 return PFKEY_ALIGN8(len); 2015 } 2016 return 0; 2017 } 2018 2019 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2020 { 2021 const struct xfrm_tmpl *t; 2022 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2023 int socklen = 0; 2024 int i; 2025 2026 for (i=0; i<xp->xfrm_nr; i++) { 2027 t = xp->xfrm_vec + i; 2028 socklen += pfkey_sockaddr_len(t->encap_family); 2029 } 2030 2031 return sizeof(struct sadb_msg) + 2032 (sizeof(struct sadb_lifetime) * 3) + 2033 (sizeof(struct sadb_address) * 2) + 2034 (sockaddr_size * 2) + 2035 sizeof(struct sadb_x_policy) + 2036 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2037 (socklen * 2) + 2038 pfkey_xfrm_policy2sec_ctx_size(xp); 2039 } 2040 2041 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2042 { 2043 struct sk_buff *skb; 2044 int size; 2045 2046 size = pfkey_xfrm_policy2msg_size(xp); 2047 2048 skb = alloc_skb(size + 16, GFP_ATOMIC); 2049 if (skb == NULL) 2050 return ERR_PTR(-ENOBUFS); 2051 2052 return skb; 2053 } 2054 2055 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2056 { 2057 struct sadb_msg *hdr; 2058 struct sadb_address *addr; 2059 struct sadb_lifetime *lifetime; 2060 struct sadb_x_policy *pol; 2061 struct sadb_x_sec_ctx *sec_ctx; 2062 struct xfrm_sec_ctx *xfrm_ctx; 2063 int i; 2064 int size; 2065 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2066 int socklen = pfkey_sockaddr_len(xp->family); 2067 2068 size = pfkey_xfrm_policy2msg_size(xp); 2069 2070 /* call should fill header later */ 2071 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2072 memset(hdr, 0, size); /* XXX do we need this ? */ 2073 2074 /* src address */ 2075 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2076 addr->sadb_address_len = 2077 (sizeof(struct sadb_address)+sockaddr_size)/ 2078 sizeof(uint64_t); 2079 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2080 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2081 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2082 addr->sadb_address_reserved = 0; 2083 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2084 xp->selector.sport, 2085 (struct sockaddr *) (addr + 1), 2086 xp->family)) 2087 BUG(); 2088 2089 /* dst address */ 2090 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2091 addr->sadb_address_len = 2092 (sizeof(struct sadb_address)+sockaddr_size)/ 2093 sizeof(uint64_t); 2094 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2095 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2096 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2097 addr->sadb_address_reserved = 0; 2098 2099 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2100 (struct sockaddr *) (addr + 1), 2101 xp->family); 2102 2103 /* hard time */ 2104 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2105 lifetime->sadb_lifetime_len = 2106 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2107 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2108 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2109 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2110 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2111 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2112 /* soft time */ 2113 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2114 lifetime->sadb_lifetime_len = 2115 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2116 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2117 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2118 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2119 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2120 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2121 /* current time */ 2122 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2123 lifetime->sadb_lifetime_len = 2124 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2125 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2126 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2127 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2128 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2129 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2130 2131 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2132 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2133 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2134 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2135 if (xp->action == XFRM_POLICY_ALLOW) { 2136 if (xp->xfrm_nr) 2137 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2138 else 2139 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2140 } 2141 pol->sadb_x_policy_dir = dir+1; 2142 pol->sadb_x_policy_reserved = 0; 2143 pol->sadb_x_policy_id = xp->index; 2144 pol->sadb_x_policy_priority = xp->priority; 2145 2146 for (i=0; i<xp->xfrm_nr; i++) { 2147 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2148 struct sadb_x_ipsecrequest *rq; 2149 int req_size; 2150 int mode; 2151 2152 req_size = sizeof(struct sadb_x_ipsecrequest); 2153 if (t->mode == XFRM_MODE_TUNNEL) { 2154 socklen = pfkey_sockaddr_len(t->encap_family); 2155 req_size += socklen * 2; 2156 } else { 2157 size -= 2*socklen; 2158 } 2159 rq = skb_put(skb, req_size); 2160 pol->sadb_x_policy_len += req_size/8; 2161 memset(rq, 0, sizeof(*rq)); 2162 rq->sadb_x_ipsecrequest_len = req_size; 2163 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2164 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2165 return -EINVAL; 2166 rq->sadb_x_ipsecrequest_mode = mode; 2167 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2168 if (t->reqid) 2169 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2170 if (t->optional) 2171 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2172 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2173 2174 if (t->mode == XFRM_MODE_TUNNEL) { 2175 u8 *sa = (void *)(rq + 1); 2176 pfkey_sockaddr_fill(&t->saddr, 0, 2177 (struct sockaddr *)sa, 2178 t->encap_family); 2179 pfkey_sockaddr_fill(&t->id.daddr, 0, 2180 (struct sockaddr *) (sa + socklen), 2181 t->encap_family); 2182 } 2183 } 2184 2185 /* security context */ 2186 if ((xfrm_ctx = xp->security)) { 2187 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2188 2189 sec_ctx = skb_put(skb, ctx_size); 2190 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2191 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2192 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2193 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2194 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2195 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2196 xfrm_ctx->ctx_len); 2197 } 2198 2199 hdr->sadb_msg_len = size / sizeof(uint64_t); 2200 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2201 2202 return 0; 2203 } 2204 2205 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2206 { 2207 struct sk_buff *out_skb; 2208 struct sadb_msg *out_hdr; 2209 int err; 2210 2211 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2212 if (IS_ERR(out_skb)) 2213 return PTR_ERR(out_skb); 2214 2215 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2216 if (err < 0) { 2217 kfree_skb(out_skb); 2218 return err; 2219 } 2220 2221 out_hdr = (struct sadb_msg *) out_skb->data; 2222 out_hdr->sadb_msg_version = PF_KEY_V2; 2223 2224 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2225 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2226 else 2227 out_hdr->sadb_msg_type = event2poltype(c->event); 2228 out_hdr->sadb_msg_errno = 0; 2229 out_hdr->sadb_msg_seq = c->seq; 2230 out_hdr->sadb_msg_pid = c->portid; 2231 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2232 return 0; 2233 2234 } 2235 2236 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2237 { 2238 struct net *net = sock_net(sk); 2239 int err = 0; 2240 struct sadb_lifetime *lifetime; 2241 struct sadb_address *sa; 2242 struct sadb_x_policy *pol; 2243 struct xfrm_policy *xp; 2244 struct km_event c; 2245 struct sadb_x_sec_ctx *sec_ctx; 2246 2247 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2248 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2249 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2250 return -EINVAL; 2251 2252 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2253 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2254 return -EINVAL; 2255 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2256 return -EINVAL; 2257 2258 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2259 if (xp == NULL) 2260 return -ENOBUFS; 2261 2262 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2263 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2264 xp->priority = pol->sadb_x_policy_priority; 2265 2266 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2267 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2268 xp->selector.family = xp->family; 2269 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2270 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2271 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2272 if (xp->selector.sport) 2273 xp->selector.sport_mask = htons(0xffff); 2274 2275 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2276 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2277 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2278 2279 /* Amusing, we set this twice. KAME apps appear to set same value 2280 * in both addresses. 2281 */ 2282 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2283 2284 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2285 if (xp->selector.dport) 2286 xp->selector.dport_mask = htons(0xffff); 2287 2288 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2289 if (sec_ctx != NULL) { 2290 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2291 2292 if (!uctx) { 2293 err = -ENOBUFS; 2294 goto out; 2295 } 2296 2297 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2298 kfree(uctx); 2299 2300 if (err) 2301 goto out; 2302 } 2303 2304 xp->lft.soft_byte_limit = XFRM_INF; 2305 xp->lft.hard_byte_limit = XFRM_INF; 2306 xp->lft.soft_packet_limit = XFRM_INF; 2307 xp->lft.hard_packet_limit = XFRM_INF; 2308 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2309 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2310 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2311 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2312 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2313 } 2314 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2315 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2316 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2317 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2318 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2319 } 2320 xp->xfrm_nr = 0; 2321 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2322 (err = parse_ipsecrequests(xp, pol)) < 0) 2323 goto out; 2324 2325 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2326 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2327 2328 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2329 2330 if (err) 2331 goto out; 2332 2333 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2334 c.event = XFRM_MSG_UPDPOLICY; 2335 else 2336 c.event = XFRM_MSG_NEWPOLICY; 2337 2338 c.seq = hdr->sadb_msg_seq; 2339 c.portid = hdr->sadb_msg_pid; 2340 2341 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2342 xfrm_pol_put(xp); 2343 return 0; 2344 2345 out: 2346 xp->walk.dead = 1; 2347 xfrm_policy_destroy(xp); 2348 return err; 2349 } 2350 2351 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2352 { 2353 struct net *net = sock_net(sk); 2354 int err; 2355 struct sadb_address *sa; 2356 struct sadb_x_policy *pol; 2357 struct xfrm_policy *xp; 2358 struct xfrm_selector sel; 2359 struct km_event c; 2360 struct sadb_x_sec_ctx *sec_ctx; 2361 struct xfrm_sec_ctx *pol_ctx = NULL; 2362 2363 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2364 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2365 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2366 return -EINVAL; 2367 2368 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2369 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2370 return -EINVAL; 2371 2372 memset(&sel, 0, sizeof(sel)); 2373 2374 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2375 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2376 sel.prefixlen_s = sa->sadb_address_prefixlen; 2377 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2378 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2379 if (sel.sport) 2380 sel.sport_mask = htons(0xffff); 2381 2382 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2383 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2384 sel.prefixlen_d = sa->sadb_address_prefixlen; 2385 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2386 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2387 if (sel.dport) 2388 sel.dport_mask = htons(0xffff); 2389 2390 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2391 if (sec_ctx != NULL) { 2392 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2393 2394 if (!uctx) 2395 return -ENOMEM; 2396 2397 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2398 kfree(uctx); 2399 if (err) 2400 return err; 2401 } 2402 2403 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN, 2404 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2405 1, &err); 2406 security_xfrm_policy_free(pol_ctx); 2407 if (xp == NULL) 2408 return -ENOENT; 2409 2410 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2411 2412 if (err) 2413 goto out; 2414 2415 c.seq = hdr->sadb_msg_seq; 2416 c.portid = hdr->sadb_msg_pid; 2417 c.data.byid = 0; 2418 c.event = XFRM_MSG_DELPOLICY; 2419 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2420 2421 out: 2422 xfrm_pol_put(xp); 2423 return err; 2424 } 2425 2426 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2427 { 2428 int err; 2429 struct sk_buff *out_skb; 2430 struct sadb_msg *out_hdr; 2431 err = 0; 2432 2433 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2434 if (IS_ERR(out_skb)) { 2435 err = PTR_ERR(out_skb); 2436 goto out; 2437 } 2438 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2439 if (err < 0) { 2440 kfree_skb(out_skb); 2441 goto out; 2442 } 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 kfree_skb(out_skb); 2695 return err; 2696 } 2697 2698 out_hdr = (struct sadb_msg *) out_skb->data; 2699 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2700 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2701 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2702 out_hdr->sadb_msg_errno = 0; 2703 out_hdr->sadb_msg_seq = count + 1; 2704 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2705 2706 if (pfk->dump.skb) 2707 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2708 &pfk->sk, sock_net(&pfk->sk)); 2709 pfk->dump.skb = out_skb; 2710 2711 return 0; 2712 } 2713 2714 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2715 { 2716 struct net *net = sock_net(&pfk->sk); 2717 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2718 } 2719 2720 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2721 { 2722 struct net *net = sock_net((struct sock *)pfk); 2723 2724 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2725 } 2726 2727 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2728 { 2729 struct pfkey_sock *pfk = pfkey_sk(sk); 2730 2731 mutex_lock(&pfk->dump_lock); 2732 if (pfk->dump.dump != NULL) { 2733 mutex_unlock(&pfk->dump_lock); 2734 return -EBUSY; 2735 } 2736 2737 pfk->dump.msg_version = hdr->sadb_msg_version; 2738 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2739 pfk->dump.dump = pfkey_dump_sp; 2740 pfk->dump.done = pfkey_dump_sp_done; 2741 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2742 mutex_unlock(&pfk->dump_lock); 2743 2744 return pfkey_do_dump(pfk); 2745 } 2746 2747 static int key_notify_policy_flush(const struct km_event *c) 2748 { 2749 struct sk_buff *skb_out; 2750 struct sadb_msg *hdr; 2751 2752 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2753 if (!skb_out) 2754 return -ENOBUFS; 2755 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2756 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2757 hdr->sadb_msg_seq = c->seq; 2758 hdr->sadb_msg_pid = c->portid; 2759 hdr->sadb_msg_version = PF_KEY_V2; 2760 hdr->sadb_msg_errno = (uint8_t) 0; 2761 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2762 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2763 hdr->sadb_msg_reserved = 0; 2764 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2765 return 0; 2766 2767 } 2768 2769 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2770 { 2771 struct net *net = sock_net(sk); 2772 struct km_event c; 2773 int err, err2; 2774 2775 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2776 err2 = unicast_flush_resp(sk, hdr); 2777 if (err || err2) { 2778 if (err == -ESRCH) /* empty table - old silent behavior */ 2779 return 0; 2780 return err; 2781 } 2782 2783 c.data.type = XFRM_POLICY_TYPE_MAIN; 2784 c.event = XFRM_MSG_FLUSHPOLICY; 2785 c.portid = hdr->sadb_msg_pid; 2786 c.seq = hdr->sadb_msg_seq; 2787 c.net = net; 2788 km_policy_notify(NULL, 0, &c); 2789 2790 return 0; 2791 } 2792 2793 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2794 const struct sadb_msg *hdr, void * const *ext_hdrs); 2795 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2796 [SADB_RESERVED] = pfkey_reserved, 2797 [SADB_GETSPI] = pfkey_getspi, 2798 [SADB_UPDATE] = pfkey_add, 2799 [SADB_ADD] = pfkey_add, 2800 [SADB_DELETE] = pfkey_delete, 2801 [SADB_GET] = pfkey_get, 2802 [SADB_ACQUIRE] = pfkey_acquire, 2803 [SADB_REGISTER] = pfkey_register, 2804 [SADB_EXPIRE] = NULL, 2805 [SADB_FLUSH] = pfkey_flush, 2806 [SADB_DUMP] = pfkey_dump, 2807 [SADB_X_PROMISC] = pfkey_promisc, 2808 [SADB_X_PCHANGE] = NULL, 2809 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2810 [SADB_X_SPDADD] = pfkey_spdadd, 2811 [SADB_X_SPDDELETE] = pfkey_spddelete, 2812 [SADB_X_SPDGET] = pfkey_spdget, 2813 [SADB_X_SPDACQUIRE] = NULL, 2814 [SADB_X_SPDDUMP] = pfkey_spddump, 2815 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2816 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2817 [SADB_X_SPDDELETE2] = pfkey_spdget, 2818 [SADB_X_MIGRATE] = pfkey_migrate, 2819 }; 2820 2821 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2822 { 2823 void *ext_hdrs[SADB_EXT_MAX]; 2824 int err; 2825 2826 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2827 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2828 2829 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2830 err = parse_exthdrs(skb, hdr, ext_hdrs); 2831 if (!err) { 2832 err = -EOPNOTSUPP; 2833 if (pfkey_funcs[hdr->sadb_msg_type]) 2834 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2835 } 2836 return err; 2837 } 2838 2839 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2840 { 2841 struct sadb_msg *hdr = NULL; 2842 2843 if (skb->len < sizeof(*hdr)) { 2844 *errp = -EMSGSIZE; 2845 } else { 2846 hdr = (struct sadb_msg *) skb->data; 2847 if (hdr->sadb_msg_version != PF_KEY_V2 || 2848 hdr->sadb_msg_reserved != 0 || 2849 (hdr->sadb_msg_type <= SADB_RESERVED || 2850 hdr->sadb_msg_type > SADB_MAX)) { 2851 hdr = NULL; 2852 *errp = -EINVAL; 2853 } else if (hdr->sadb_msg_len != (skb->len / 2854 sizeof(uint64_t)) || 2855 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2856 sizeof(uint64_t))) { 2857 hdr = NULL; 2858 *errp = -EMSGSIZE; 2859 } else { 2860 *errp = 0; 2861 } 2862 } 2863 return hdr; 2864 } 2865 2866 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2867 const struct xfrm_algo_desc *d) 2868 { 2869 unsigned int id = d->desc.sadb_alg_id; 2870 2871 if (id >= sizeof(t->aalgos) * 8) 2872 return 0; 2873 2874 return (t->aalgos >> id) & 1; 2875 } 2876 2877 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2878 const struct xfrm_algo_desc *d) 2879 { 2880 unsigned int id = d->desc.sadb_alg_id; 2881 2882 if (id >= sizeof(t->ealgos) * 8) 2883 return 0; 2884 2885 return (t->ealgos >> id) & 1; 2886 } 2887 2888 static int count_ah_combs(const struct xfrm_tmpl *t) 2889 { 2890 int i, sz = 0; 2891 2892 for (i = 0; ; i++) { 2893 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2894 if (!aalg) 2895 break; 2896 if (!aalg->pfkey_supported) 2897 continue; 2898 if (aalg_tmpl_set(t, aalg) && aalg->available) 2899 sz += sizeof(struct sadb_comb); 2900 } 2901 return sz + sizeof(struct sadb_prop); 2902 } 2903 2904 static int count_esp_combs(const struct xfrm_tmpl *t) 2905 { 2906 int i, k, sz = 0; 2907 2908 for (i = 0; ; i++) { 2909 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2910 if (!ealg) 2911 break; 2912 2913 if (!ealg->pfkey_supported) 2914 continue; 2915 2916 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2917 continue; 2918 2919 for (k = 1; ; k++) { 2920 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2921 if (!aalg) 2922 break; 2923 2924 if (!aalg->pfkey_supported) 2925 continue; 2926 2927 if (aalg_tmpl_set(t, aalg) && aalg->available) 2928 sz += sizeof(struct sadb_comb); 2929 } 2930 } 2931 return sz + sizeof(struct sadb_prop); 2932 } 2933 2934 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2935 { 2936 struct sadb_prop *p; 2937 int i; 2938 2939 p = skb_put(skb, sizeof(struct sadb_prop)); 2940 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2941 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2942 p->sadb_prop_replay = 32; 2943 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2944 2945 for (i = 0; ; i++) { 2946 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2947 if (!aalg) 2948 break; 2949 2950 if (!aalg->pfkey_supported) 2951 continue; 2952 2953 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2954 struct sadb_comb *c; 2955 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2956 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2957 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2958 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2959 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2960 c->sadb_comb_hard_addtime = 24*60*60; 2961 c->sadb_comb_soft_addtime = 20*60*60; 2962 c->sadb_comb_hard_usetime = 8*60*60; 2963 c->sadb_comb_soft_usetime = 7*60*60; 2964 } 2965 } 2966 } 2967 2968 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2969 { 2970 struct sadb_prop *p; 2971 int i, k; 2972 2973 p = skb_put(skb, sizeof(struct sadb_prop)); 2974 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2975 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2976 p->sadb_prop_replay = 32; 2977 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2978 2979 for (i=0; ; i++) { 2980 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2981 if (!ealg) 2982 break; 2983 2984 if (!ealg->pfkey_supported) 2985 continue; 2986 2987 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2988 continue; 2989 2990 for (k = 1; ; k++) { 2991 struct sadb_comb *c; 2992 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2993 if (!aalg) 2994 break; 2995 if (!aalg->pfkey_supported) 2996 continue; 2997 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2998 continue; 2999 c = skb_put(skb, sizeof(struct sadb_comb)); 3000 memset(c, 0, sizeof(*c)); 3001 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3002 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3003 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3004 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3005 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3006 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3007 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3008 c->sadb_comb_hard_addtime = 24*60*60; 3009 c->sadb_comb_soft_addtime = 20*60*60; 3010 c->sadb_comb_hard_usetime = 8*60*60; 3011 c->sadb_comb_soft_usetime = 7*60*60; 3012 } 3013 } 3014 } 3015 3016 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3017 { 3018 return 0; 3019 } 3020 3021 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3022 { 3023 struct sk_buff *out_skb; 3024 struct sadb_msg *out_hdr; 3025 int hard; 3026 int hsc; 3027 3028 hard = c->data.hard; 3029 if (hard) 3030 hsc = 2; 3031 else 3032 hsc = 1; 3033 3034 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3035 if (IS_ERR(out_skb)) 3036 return PTR_ERR(out_skb); 3037 3038 out_hdr = (struct sadb_msg *) out_skb->data; 3039 out_hdr->sadb_msg_version = PF_KEY_V2; 3040 out_hdr->sadb_msg_type = SADB_EXPIRE; 3041 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3042 out_hdr->sadb_msg_errno = 0; 3043 out_hdr->sadb_msg_reserved = 0; 3044 out_hdr->sadb_msg_seq = 0; 3045 out_hdr->sadb_msg_pid = 0; 3046 3047 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3048 xs_net(x)); 3049 return 0; 3050 } 3051 3052 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3053 { 3054 struct net *net = x ? xs_net(x) : c->net; 3055 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3056 3057 if (atomic_read(&net_pfkey->socks_nr) == 0) 3058 return 0; 3059 3060 switch (c->event) { 3061 case XFRM_MSG_EXPIRE: 3062 return key_notify_sa_expire(x, c); 3063 case XFRM_MSG_DELSA: 3064 case XFRM_MSG_NEWSA: 3065 case XFRM_MSG_UPDSA: 3066 return key_notify_sa(x, c); 3067 case XFRM_MSG_FLUSHSA: 3068 return key_notify_sa_flush(c); 3069 case XFRM_MSG_NEWAE: /* not yet supported */ 3070 break; 3071 default: 3072 pr_err("pfkey: Unknown SA event %d\n", c->event); 3073 break; 3074 } 3075 3076 return 0; 3077 } 3078 3079 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3080 { 3081 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3082 return 0; 3083 3084 switch (c->event) { 3085 case XFRM_MSG_POLEXPIRE: 3086 return key_notify_policy_expire(xp, c); 3087 case XFRM_MSG_DELPOLICY: 3088 case XFRM_MSG_NEWPOLICY: 3089 case XFRM_MSG_UPDPOLICY: 3090 return key_notify_policy(xp, dir, c); 3091 case XFRM_MSG_FLUSHPOLICY: 3092 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3093 break; 3094 return key_notify_policy_flush(c); 3095 default: 3096 pr_err("pfkey: Unknown policy event %d\n", c->event); 3097 break; 3098 } 3099 3100 return 0; 3101 } 3102 3103 static u32 get_acqseq(void) 3104 { 3105 u32 res; 3106 static atomic_t acqseq; 3107 3108 do { 3109 res = atomic_inc_return(&acqseq); 3110 } while (!res); 3111 return res; 3112 } 3113 3114 static bool pfkey_is_alive(const struct km_event *c) 3115 { 3116 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3117 struct sock *sk; 3118 bool is_alive = false; 3119 3120 rcu_read_lock(); 3121 sk_for_each_rcu(sk, &net_pfkey->table) { 3122 if (pfkey_sk(sk)->registered) { 3123 is_alive = true; 3124 break; 3125 } 3126 } 3127 rcu_read_unlock(); 3128 3129 return is_alive; 3130 } 3131 3132 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3133 { 3134 struct sk_buff *skb; 3135 struct sadb_msg *hdr; 3136 struct sadb_address *addr; 3137 struct sadb_x_policy *pol; 3138 int sockaddr_size; 3139 int size; 3140 struct sadb_x_sec_ctx *sec_ctx; 3141 struct xfrm_sec_ctx *xfrm_ctx; 3142 int ctx_size = 0; 3143 3144 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3145 if (!sockaddr_size) 3146 return -EINVAL; 3147 3148 size = sizeof(struct sadb_msg) + 3149 (sizeof(struct sadb_address) * 2) + 3150 (sockaddr_size * 2) + 3151 sizeof(struct sadb_x_policy); 3152 3153 if (x->id.proto == IPPROTO_AH) 3154 size += count_ah_combs(t); 3155 else if (x->id.proto == IPPROTO_ESP) 3156 size += count_esp_combs(t); 3157 3158 if ((xfrm_ctx = x->security)) { 3159 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3160 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3161 } 3162 3163 skb = alloc_skb(size + 16, GFP_ATOMIC); 3164 if (skb == NULL) 3165 return -ENOMEM; 3166 3167 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3168 hdr->sadb_msg_version = PF_KEY_V2; 3169 hdr->sadb_msg_type = SADB_ACQUIRE; 3170 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3171 hdr->sadb_msg_len = size / sizeof(uint64_t); 3172 hdr->sadb_msg_errno = 0; 3173 hdr->sadb_msg_reserved = 0; 3174 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3175 hdr->sadb_msg_pid = 0; 3176 3177 /* src address */ 3178 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3179 addr->sadb_address_len = 3180 (sizeof(struct sadb_address)+sockaddr_size)/ 3181 sizeof(uint64_t); 3182 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3183 addr->sadb_address_proto = 0; 3184 addr->sadb_address_reserved = 0; 3185 addr->sadb_address_prefixlen = 3186 pfkey_sockaddr_fill(&x->props.saddr, 0, 3187 (struct sockaddr *) (addr + 1), 3188 x->props.family); 3189 if (!addr->sadb_address_prefixlen) 3190 BUG(); 3191 3192 /* dst address */ 3193 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3194 addr->sadb_address_len = 3195 (sizeof(struct sadb_address)+sockaddr_size)/ 3196 sizeof(uint64_t); 3197 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3198 addr->sadb_address_proto = 0; 3199 addr->sadb_address_reserved = 0; 3200 addr->sadb_address_prefixlen = 3201 pfkey_sockaddr_fill(&x->id.daddr, 0, 3202 (struct sockaddr *) (addr + 1), 3203 x->props.family); 3204 if (!addr->sadb_address_prefixlen) 3205 BUG(); 3206 3207 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3208 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3209 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3210 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3211 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3212 pol->sadb_x_policy_reserved = 0; 3213 pol->sadb_x_policy_id = xp->index; 3214 pol->sadb_x_policy_priority = xp->priority; 3215 3216 /* Set sadb_comb's. */ 3217 if (x->id.proto == IPPROTO_AH) 3218 dump_ah_combs(skb, t); 3219 else if (x->id.proto == IPPROTO_ESP) 3220 dump_esp_combs(skb, t); 3221 3222 /* security context */ 3223 if (xfrm_ctx) { 3224 sec_ctx = skb_put(skb, 3225 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3226 sec_ctx->sadb_x_sec_len = 3227 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3228 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3229 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3230 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3231 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3232 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3233 xfrm_ctx->ctx_len); 3234 } 3235 3236 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3237 xs_net(x)); 3238 } 3239 3240 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3241 u8 *data, int len, int *dir) 3242 { 3243 struct net *net = sock_net(sk); 3244 struct xfrm_policy *xp; 3245 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3246 struct sadb_x_sec_ctx *sec_ctx; 3247 3248 switch (sk->sk_family) { 3249 case AF_INET: 3250 if (opt != IP_IPSEC_POLICY) { 3251 *dir = -EOPNOTSUPP; 3252 return NULL; 3253 } 3254 break; 3255 #if IS_ENABLED(CONFIG_IPV6) 3256 case AF_INET6: 3257 if (opt != IPV6_IPSEC_POLICY) { 3258 *dir = -EOPNOTSUPP; 3259 return NULL; 3260 } 3261 break; 3262 #endif 3263 default: 3264 *dir = -EINVAL; 3265 return NULL; 3266 } 3267 3268 *dir = -EINVAL; 3269 3270 if (len < sizeof(struct sadb_x_policy) || 3271 pol->sadb_x_policy_len*8 > len || 3272 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3273 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3274 return NULL; 3275 3276 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3277 if (xp == NULL) { 3278 *dir = -ENOBUFS; 3279 return NULL; 3280 } 3281 3282 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3283 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3284 3285 xp->lft.soft_byte_limit = XFRM_INF; 3286 xp->lft.hard_byte_limit = XFRM_INF; 3287 xp->lft.soft_packet_limit = XFRM_INF; 3288 xp->lft.hard_packet_limit = XFRM_INF; 3289 xp->family = sk->sk_family; 3290 3291 xp->xfrm_nr = 0; 3292 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3293 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3294 goto out; 3295 3296 /* security context too */ 3297 if (len >= (pol->sadb_x_policy_len*8 + 3298 sizeof(struct sadb_x_sec_ctx))) { 3299 char *p = (char *)pol; 3300 struct xfrm_user_sec_ctx *uctx; 3301 3302 p += pol->sadb_x_policy_len*8; 3303 sec_ctx = (struct sadb_x_sec_ctx *)p; 3304 if (len < pol->sadb_x_policy_len*8 + 3305 sec_ctx->sadb_x_sec_len*8) { 3306 *dir = -EINVAL; 3307 goto out; 3308 } 3309 if ((*dir = verify_sec_ctx_len(p))) 3310 goto out; 3311 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3312 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3313 kfree(uctx); 3314 3315 if (*dir) 3316 goto out; 3317 } 3318 3319 *dir = pol->sadb_x_policy_dir-1; 3320 return xp; 3321 3322 out: 3323 xp->walk.dead = 1; 3324 xfrm_policy_destroy(xp); 3325 return NULL; 3326 } 3327 3328 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3329 { 3330 struct sk_buff *skb; 3331 struct sadb_msg *hdr; 3332 struct sadb_sa *sa; 3333 struct sadb_address *addr; 3334 struct sadb_x_nat_t_port *n_port; 3335 int sockaddr_size; 3336 int size; 3337 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3338 struct xfrm_encap_tmpl *natt = NULL; 3339 3340 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3341 if (!sockaddr_size) 3342 return -EINVAL; 3343 3344 if (!satype) 3345 return -EINVAL; 3346 3347 if (!x->encap) 3348 return -EINVAL; 3349 3350 natt = x->encap; 3351 3352 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3353 * 3354 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3355 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3356 */ 3357 3358 size = sizeof(struct sadb_msg) + 3359 sizeof(struct sadb_sa) + 3360 (sizeof(struct sadb_address) * 2) + 3361 (sockaddr_size * 2) + 3362 (sizeof(struct sadb_x_nat_t_port) * 2); 3363 3364 skb = alloc_skb(size + 16, GFP_ATOMIC); 3365 if (skb == NULL) 3366 return -ENOMEM; 3367 3368 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3369 hdr->sadb_msg_version = PF_KEY_V2; 3370 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3371 hdr->sadb_msg_satype = satype; 3372 hdr->sadb_msg_len = size / sizeof(uint64_t); 3373 hdr->sadb_msg_errno = 0; 3374 hdr->sadb_msg_reserved = 0; 3375 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3376 hdr->sadb_msg_pid = 0; 3377 3378 /* SA */ 3379 sa = skb_put(skb, sizeof(struct sadb_sa)); 3380 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3381 sa->sadb_sa_exttype = SADB_EXT_SA; 3382 sa->sadb_sa_spi = x->id.spi; 3383 sa->sadb_sa_replay = 0; 3384 sa->sadb_sa_state = 0; 3385 sa->sadb_sa_auth = 0; 3386 sa->sadb_sa_encrypt = 0; 3387 sa->sadb_sa_flags = 0; 3388 3389 /* ADDRESS_SRC (old addr) */ 3390 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3391 addr->sadb_address_len = 3392 (sizeof(struct sadb_address)+sockaddr_size)/ 3393 sizeof(uint64_t); 3394 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3395 addr->sadb_address_proto = 0; 3396 addr->sadb_address_reserved = 0; 3397 addr->sadb_address_prefixlen = 3398 pfkey_sockaddr_fill(&x->props.saddr, 0, 3399 (struct sockaddr *) (addr + 1), 3400 x->props.family); 3401 if (!addr->sadb_address_prefixlen) 3402 BUG(); 3403 3404 /* NAT_T_SPORT (old port) */ 3405 n_port = skb_put(skb, sizeof(*n_port)); 3406 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3407 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3408 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3409 n_port->sadb_x_nat_t_port_reserved = 0; 3410 3411 /* ADDRESS_DST (new addr) */ 3412 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3413 addr->sadb_address_len = 3414 (sizeof(struct sadb_address)+sockaddr_size)/ 3415 sizeof(uint64_t); 3416 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3417 addr->sadb_address_proto = 0; 3418 addr->sadb_address_reserved = 0; 3419 addr->sadb_address_prefixlen = 3420 pfkey_sockaddr_fill(ipaddr, 0, 3421 (struct sockaddr *) (addr + 1), 3422 x->props.family); 3423 if (!addr->sadb_address_prefixlen) 3424 BUG(); 3425 3426 /* NAT_T_DPORT (new port) */ 3427 n_port = skb_put(skb, sizeof(*n_port)); 3428 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3429 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3430 n_port->sadb_x_nat_t_port_port = sport; 3431 n_port->sadb_x_nat_t_port_reserved = 0; 3432 3433 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3434 xs_net(x)); 3435 } 3436 3437 #ifdef CONFIG_NET_KEY_MIGRATE 3438 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3439 const struct xfrm_selector *sel) 3440 { 3441 struct sadb_address *addr; 3442 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3443 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3444 addr->sadb_address_exttype = type; 3445 addr->sadb_address_proto = sel->proto; 3446 addr->sadb_address_reserved = 0; 3447 3448 switch (type) { 3449 case SADB_EXT_ADDRESS_SRC: 3450 addr->sadb_address_prefixlen = sel->prefixlen_s; 3451 pfkey_sockaddr_fill(&sel->saddr, 0, 3452 (struct sockaddr *)(addr + 1), 3453 sel->family); 3454 break; 3455 case SADB_EXT_ADDRESS_DST: 3456 addr->sadb_address_prefixlen = sel->prefixlen_d; 3457 pfkey_sockaddr_fill(&sel->daddr, 0, 3458 (struct sockaddr *)(addr + 1), 3459 sel->family); 3460 break; 3461 default: 3462 return -EINVAL; 3463 } 3464 3465 return 0; 3466 } 3467 3468 3469 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3470 { 3471 struct sadb_x_kmaddress *kma; 3472 u8 *sa; 3473 int family = k->family; 3474 int socklen = pfkey_sockaddr_len(family); 3475 int size_req; 3476 3477 size_req = (sizeof(struct sadb_x_kmaddress) + 3478 pfkey_sockaddr_pair_size(family)); 3479 3480 kma = skb_put_zero(skb, size_req); 3481 kma->sadb_x_kmaddress_len = size_req / 8; 3482 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3483 kma->sadb_x_kmaddress_reserved = k->reserved; 3484 3485 sa = (u8 *)(kma + 1); 3486 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3487 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3488 return -EINVAL; 3489 3490 return 0; 3491 } 3492 3493 static int set_ipsecrequest(struct sk_buff *skb, 3494 uint8_t proto, uint8_t mode, int level, 3495 uint32_t reqid, uint8_t family, 3496 const xfrm_address_t *src, const xfrm_address_t *dst) 3497 { 3498 struct sadb_x_ipsecrequest *rq; 3499 u8 *sa; 3500 int socklen = pfkey_sockaddr_len(family); 3501 int size_req; 3502 3503 size_req = sizeof(struct sadb_x_ipsecrequest) + 3504 pfkey_sockaddr_pair_size(family); 3505 3506 rq = skb_put_zero(skb, size_req); 3507 rq->sadb_x_ipsecrequest_len = size_req; 3508 rq->sadb_x_ipsecrequest_proto = proto; 3509 rq->sadb_x_ipsecrequest_mode = mode; 3510 rq->sadb_x_ipsecrequest_level = level; 3511 rq->sadb_x_ipsecrequest_reqid = reqid; 3512 3513 sa = (u8 *) (rq + 1); 3514 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3515 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3516 return -EINVAL; 3517 3518 return 0; 3519 } 3520 #endif 3521 3522 #ifdef CONFIG_NET_KEY_MIGRATE 3523 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3524 const struct xfrm_migrate *m, int num_bundles, 3525 const struct xfrm_kmaddress *k, 3526 const struct xfrm_encap_tmpl *encap) 3527 { 3528 int i; 3529 int sasize_sel; 3530 int size = 0; 3531 int size_pol = 0; 3532 struct sk_buff *skb; 3533 struct sadb_msg *hdr; 3534 struct sadb_x_policy *pol; 3535 const struct xfrm_migrate *mp; 3536 3537 if (type != XFRM_POLICY_TYPE_MAIN) 3538 return 0; 3539 3540 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3541 return -EINVAL; 3542 3543 if (k != NULL) { 3544 /* addresses for KM */ 3545 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3546 pfkey_sockaddr_pair_size(k->family)); 3547 } 3548 3549 /* selector */ 3550 sasize_sel = pfkey_sockaddr_size(sel->family); 3551 if (!sasize_sel) 3552 return -EINVAL; 3553 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3554 3555 /* policy info */ 3556 size_pol += sizeof(struct sadb_x_policy); 3557 3558 /* ipsecrequests */ 3559 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3560 /* old locator pair */ 3561 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3562 pfkey_sockaddr_pair_size(mp->old_family); 3563 /* new locator pair */ 3564 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3565 pfkey_sockaddr_pair_size(mp->new_family); 3566 } 3567 3568 size += sizeof(struct sadb_msg) + size_pol; 3569 3570 /* alloc buffer */ 3571 skb = alloc_skb(size, GFP_ATOMIC); 3572 if (skb == NULL) 3573 return -ENOMEM; 3574 3575 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3576 hdr->sadb_msg_version = PF_KEY_V2; 3577 hdr->sadb_msg_type = SADB_X_MIGRATE; 3578 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3579 hdr->sadb_msg_len = size / 8; 3580 hdr->sadb_msg_errno = 0; 3581 hdr->sadb_msg_reserved = 0; 3582 hdr->sadb_msg_seq = 0; 3583 hdr->sadb_msg_pid = 0; 3584 3585 /* Addresses to be used by KM for negotiation, if ext is available */ 3586 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3587 goto err; 3588 3589 /* selector src */ 3590 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3591 3592 /* selector dst */ 3593 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3594 3595 /* policy information */ 3596 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3597 pol->sadb_x_policy_len = size_pol / 8; 3598 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3599 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3600 pol->sadb_x_policy_dir = dir + 1; 3601 pol->sadb_x_policy_reserved = 0; 3602 pol->sadb_x_policy_id = 0; 3603 pol->sadb_x_policy_priority = 0; 3604 3605 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3606 /* old ipsecrequest */ 3607 int mode = pfkey_mode_from_xfrm(mp->mode); 3608 if (mode < 0) 3609 goto err; 3610 if (set_ipsecrequest(skb, mp->proto, mode, 3611 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3612 mp->reqid, mp->old_family, 3613 &mp->old_saddr, &mp->old_daddr) < 0) 3614 goto err; 3615 3616 /* new ipsecrequest */ 3617 if (set_ipsecrequest(skb, mp->proto, mode, 3618 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3619 mp->reqid, mp->new_family, 3620 &mp->new_saddr, &mp->new_daddr) < 0) 3621 goto err; 3622 } 3623 3624 /* broadcast migrate message to sockets */ 3625 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3626 3627 return 0; 3628 3629 err: 3630 kfree_skb(skb); 3631 return -EINVAL; 3632 } 3633 #else 3634 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3635 const struct xfrm_migrate *m, int num_bundles, 3636 const struct xfrm_kmaddress *k, 3637 const struct xfrm_encap_tmpl *encap) 3638 { 3639 return -ENOPROTOOPT; 3640 } 3641 #endif 3642 3643 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3644 { 3645 struct sock *sk = sock->sk; 3646 struct sk_buff *skb = NULL; 3647 struct sadb_msg *hdr = NULL; 3648 int err; 3649 struct net *net = sock_net(sk); 3650 3651 err = -EOPNOTSUPP; 3652 if (msg->msg_flags & MSG_OOB) 3653 goto out; 3654 3655 err = -EMSGSIZE; 3656 if ((unsigned int)len > sk->sk_sndbuf - 32) 3657 goto out; 3658 3659 err = -ENOBUFS; 3660 skb = alloc_skb(len, GFP_KERNEL); 3661 if (skb == NULL) 3662 goto out; 3663 3664 err = -EFAULT; 3665 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3666 goto out; 3667 3668 hdr = pfkey_get_base_msg(skb, &err); 3669 if (!hdr) 3670 goto out; 3671 3672 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3673 err = pfkey_process(sk, skb, hdr); 3674 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3675 3676 out: 3677 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3678 err = 0; 3679 kfree_skb(skb); 3680 3681 return err ? : len; 3682 } 3683 3684 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3685 int flags) 3686 { 3687 struct sock *sk = sock->sk; 3688 struct pfkey_sock *pfk = pfkey_sk(sk); 3689 struct sk_buff *skb; 3690 int copied, err; 3691 3692 err = -EINVAL; 3693 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3694 goto out; 3695 3696 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3697 if (skb == NULL) 3698 goto out; 3699 3700 copied = skb->len; 3701 if (copied > len) { 3702 msg->msg_flags |= MSG_TRUNC; 3703 copied = len; 3704 } 3705 3706 skb_reset_transport_header(skb); 3707 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3708 if (err) 3709 goto out_free; 3710 3711 sock_recv_ts_and_drops(msg, sk, skb); 3712 3713 err = (flags & MSG_TRUNC) ? skb->len : copied; 3714 3715 if (pfk->dump.dump != NULL && 3716 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3717 pfkey_do_dump(pfk); 3718 3719 out_free: 3720 skb_free_datagram(sk, skb); 3721 out: 3722 return err; 3723 } 3724 3725 static const struct proto_ops pfkey_ops = { 3726 .family = PF_KEY, 3727 .owner = THIS_MODULE, 3728 /* Operations that make no sense on pfkey sockets. */ 3729 .bind = sock_no_bind, 3730 .connect = sock_no_connect, 3731 .socketpair = sock_no_socketpair, 3732 .accept = sock_no_accept, 3733 .getname = sock_no_getname, 3734 .ioctl = sock_no_ioctl, 3735 .listen = sock_no_listen, 3736 .shutdown = sock_no_shutdown, 3737 .setsockopt = sock_no_setsockopt, 3738 .getsockopt = sock_no_getsockopt, 3739 .mmap = sock_no_mmap, 3740 .sendpage = sock_no_sendpage, 3741 3742 /* Now the operations that really occur. */ 3743 .release = pfkey_release, 3744 .poll = datagram_poll, 3745 .sendmsg = pfkey_sendmsg, 3746 .recvmsg = pfkey_recvmsg, 3747 }; 3748 3749 static const struct net_proto_family pfkey_family_ops = { 3750 .family = PF_KEY, 3751 .create = pfkey_create, 3752 .owner = THIS_MODULE, 3753 }; 3754 3755 #ifdef CONFIG_PROC_FS 3756 static int pfkey_seq_show(struct seq_file *f, void *v) 3757 { 3758 struct sock *s = sk_entry(v); 3759 3760 if (v == SEQ_START_TOKEN) 3761 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3762 else 3763 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3764 s, 3765 refcount_read(&s->sk_refcnt), 3766 sk_rmem_alloc_get(s), 3767 sk_wmem_alloc_get(s), 3768 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3769 sock_i_ino(s) 3770 ); 3771 return 0; 3772 } 3773 3774 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3775 __acquires(rcu) 3776 { 3777 struct net *net = seq_file_net(f); 3778 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3779 3780 rcu_read_lock(); 3781 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3782 } 3783 3784 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3785 { 3786 struct net *net = seq_file_net(f); 3787 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3788 3789 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3790 } 3791 3792 static void pfkey_seq_stop(struct seq_file *f, void *v) 3793 __releases(rcu) 3794 { 3795 rcu_read_unlock(); 3796 } 3797 3798 static const struct seq_operations pfkey_seq_ops = { 3799 .start = pfkey_seq_start, 3800 .next = pfkey_seq_next, 3801 .stop = pfkey_seq_stop, 3802 .show = pfkey_seq_show, 3803 }; 3804 3805 static int __net_init pfkey_init_proc(struct net *net) 3806 { 3807 struct proc_dir_entry *e; 3808 3809 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3810 sizeof(struct seq_net_private)); 3811 if (e == NULL) 3812 return -ENOMEM; 3813 3814 return 0; 3815 } 3816 3817 static void __net_exit pfkey_exit_proc(struct net *net) 3818 { 3819 remove_proc_entry("pfkey", net->proc_net); 3820 } 3821 #else 3822 static inline int pfkey_init_proc(struct net *net) 3823 { 3824 return 0; 3825 } 3826 3827 static inline void pfkey_exit_proc(struct net *net) 3828 { 3829 } 3830 #endif 3831 3832 static struct xfrm_mgr pfkeyv2_mgr = 3833 { 3834 .notify = pfkey_send_notify, 3835 .acquire = pfkey_send_acquire, 3836 .compile_policy = pfkey_compile_policy, 3837 .new_mapping = pfkey_send_new_mapping, 3838 .notify_policy = pfkey_send_policy_notify, 3839 .migrate = pfkey_send_migrate, 3840 .is_alive = pfkey_is_alive, 3841 }; 3842 3843 static int __net_init pfkey_net_init(struct net *net) 3844 { 3845 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3846 int rv; 3847 3848 INIT_HLIST_HEAD(&net_pfkey->table); 3849 atomic_set(&net_pfkey->socks_nr, 0); 3850 3851 rv = pfkey_init_proc(net); 3852 3853 return rv; 3854 } 3855 3856 static void __net_exit pfkey_net_exit(struct net *net) 3857 { 3858 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3859 3860 pfkey_exit_proc(net); 3861 WARN_ON(!hlist_empty(&net_pfkey->table)); 3862 } 3863 3864 static struct pernet_operations pfkey_net_ops = { 3865 .init = pfkey_net_init, 3866 .exit = pfkey_net_exit, 3867 .id = &pfkey_net_id, 3868 .size = sizeof(struct netns_pfkey), 3869 }; 3870 3871 static void __exit ipsec_pfkey_exit(void) 3872 { 3873 xfrm_unregister_km(&pfkeyv2_mgr); 3874 sock_unregister(PF_KEY); 3875 unregister_pernet_subsys(&pfkey_net_ops); 3876 proto_unregister(&key_proto); 3877 } 3878 3879 static int __init ipsec_pfkey_init(void) 3880 { 3881 int err = proto_register(&key_proto, 0); 3882 3883 if (err != 0) 3884 goto out; 3885 3886 err = register_pernet_subsys(&pfkey_net_ops); 3887 if (err != 0) 3888 goto out_unregister_key_proto; 3889 err = sock_register(&pfkey_family_ops); 3890 if (err != 0) 3891 goto out_unregister_pernet; 3892 err = xfrm_register_km(&pfkeyv2_mgr); 3893 if (err != 0) 3894 goto out_sock_unregister; 3895 out: 3896 return err; 3897 3898 out_sock_unregister: 3899 sock_unregister(PF_KEY); 3900 out_unregister_pernet: 3901 unregister_pernet_subsys(&pfkey_net_ops); 3902 out_unregister_key_proto: 3903 proto_unregister(&key_proto); 3904 goto out; 3905 } 3906 3907 module_init(ipsec_pfkey_init); 3908 module_exit(ipsec_pfkey_exit); 3909 MODULE_LICENSE("GPL"); 3910 MODULE_ALIAS_NETPROTO(PF_KEY); 3911