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; 144 145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 146 return -EPERM; 147 if (sock->type != SOCK_RAW) 148 return -ESOCKTNOSUPPORT; 149 if (protocol != PF_KEY_V2) 150 return -EPROTONOSUPPORT; 151 152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 153 if (sk == NULL) 154 return -ENOMEM; 155 156 pfk = pfkey_sk(sk); 157 mutex_init(&pfk->dump_lock); 158 159 sock->ops = &pfkey_ops; 160 sock_init_data(sock, sk); 161 162 sk->sk_family = PF_KEY; 163 sk->sk_destruct = pfkey_sock_destruct; 164 165 atomic_inc(&net_pfkey->socks_nr); 166 167 pfkey_insert(sk); 168 169 return 0; 170 } 171 172 static int pfkey_release(struct socket *sock) 173 { 174 struct sock *sk = sock->sk; 175 176 if (!sk) 177 return 0; 178 179 pfkey_remove(sk); 180 181 sock_orphan(sk); 182 sock->sk = NULL; 183 skb_queue_purge(&sk->sk_write_queue); 184 185 synchronize_rcu(); 186 sock_put(sk); 187 188 return 0; 189 } 190 191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 192 struct sock *sk) 193 { 194 int err = -ENOBUFS; 195 196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 197 return err; 198 199 skb = skb_clone(skb, allocation); 200 201 if (skb) { 202 skb_set_owner_r(skb, sk); 203 skb_queue_tail(&sk->sk_receive_queue, skb); 204 sk->sk_data_ready(sk); 205 err = 0; 206 } 207 return err; 208 } 209 210 /* Send SKB to all pfkey sockets matching selected criteria. */ 211 #define BROADCAST_ALL 0 212 #define BROADCAST_ONE 1 213 #define BROADCAST_REGISTERED 2 214 #define BROADCAST_PROMISC_ONLY 4 215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 216 int broadcast_flags, struct sock *one_sk, 217 struct net *net) 218 { 219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 220 struct sock *sk; 221 int err = -ESRCH; 222 223 /* XXX Do we need something like netlink_overrun? I think 224 * XXX PF_KEY socket apps will not mind current behavior. 225 */ 226 if (!skb) 227 return -ENOMEM; 228 229 rcu_read_lock(); 230 sk_for_each_rcu(sk, &net_pfkey->table) { 231 struct pfkey_sock *pfk = pfkey_sk(sk); 232 int err2; 233 234 /* Yes, it means that if you are meant to receive this 235 * pfkey message you receive it twice as promiscuous 236 * socket. 237 */ 238 if (pfk->promisc) 239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 240 241 /* the exact target will be processed later */ 242 if (sk == one_sk) 243 continue; 244 if (broadcast_flags != BROADCAST_ALL) { 245 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 246 continue; 247 if ((broadcast_flags & BROADCAST_REGISTERED) && 248 !pfk->registered) 249 continue; 250 if (broadcast_flags & BROADCAST_ONE) 251 continue; 252 } 253 254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 255 256 /* Error is cleared after successful sending to at least one 257 * registered KM */ 258 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 259 err = err2; 260 } 261 rcu_read_unlock(); 262 263 if (one_sk != NULL) 264 err = pfkey_broadcast_one(skb, allocation, one_sk); 265 266 kfree_skb(skb); 267 return err; 268 } 269 270 static int pfkey_do_dump(struct pfkey_sock *pfk) 271 { 272 struct sadb_msg *hdr; 273 int rc; 274 275 mutex_lock(&pfk->dump_lock); 276 if (!pfk->dump.dump) { 277 rc = 0; 278 goto out; 279 } 280 281 rc = pfk->dump.dump(pfk); 282 if (rc == -ENOBUFS) { 283 rc = 0; 284 goto out; 285 } 286 287 if (pfk->dump.skb) { 288 if (!pfkey_can_dump(&pfk->sk)) { 289 rc = 0; 290 goto out; 291 } 292 293 hdr = (struct sadb_msg *) pfk->dump.skb->data; 294 hdr->sadb_msg_seq = 0; 295 hdr->sadb_msg_errno = rc; 296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 297 &pfk->sk, sock_net(&pfk->sk)); 298 pfk->dump.skb = NULL; 299 } 300 301 pfkey_terminate_dump(pfk); 302 303 out: 304 mutex_unlock(&pfk->dump_lock); 305 return rc; 306 } 307 308 static inline void pfkey_hdr_dup(struct sadb_msg *new, 309 const struct sadb_msg *orig) 310 { 311 *new = *orig; 312 } 313 314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 315 { 316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 317 struct sadb_msg *hdr; 318 319 if (!skb) 320 return -ENOBUFS; 321 322 /* Woe be to the platform trying to support PFKEY yet 323 * having normal errnos outside the 1-255 range, inclusive. 324 */ 325 err = -err; 326 if (err == ERESTARTSYS || 327 err == ERESTARTNOHAND || 328 err == ERESTARTNOINTR) 329 err = EINTR; 330 if (err >= 512) 331 err = EINVAL; 332 BUG_ON(err <= 0 || err >= 256); 333 334 hdr = skb_put(skb, sizeof(struct sadb_msg)); 335 pfkey_hdr_dup(hdr, orig); 336 hdr->sadb_msg_errno = (uint8_t) err; 337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 338 sizeof(uint64_t)); 339 340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 341 342 return 0; 343 } 344 345 static const u8 sadb_ext_min_len[] = { 346 [SADB_EXT_RESERVED] = (u8) 0, 347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 373 }; 374 375 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 376 static int verify_address_len(const void *p) 377 { 378 const struct sadb_address *sp = p; 379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 380 const struct sockaddr_in *sin; 381 #if IS_ENABLED(CONFIG_IPV6) 382 const struct sockaddr_in6 *sin6; 383 #endif 384 int len; 385 386 if (sp->sadb_address_len < 387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 388 sizeof(uint64_t))) 389 return -EINVAL; 390 391 switch (addr->sa_family) { 392 case AF_INET: 393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 394 if (sp->sadb_address_len != len || 395 sp->sadb_address_prefixlen > 32) 396 return -EINVAL; 397 break; 398 #if IS_ENABLED(CONFIG_IPV6) 399 case AF_INET6: 400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 401 if (sp->sadb_address_len != len || 402 sp->sadb_address_prefixlen > 128) 403 return -EINVAL; 404 break; 405 #endif 406 default: 407 /* It is user using kernel to keep track of security 408 * associations for another protocol, such as 409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 410 * lengths. 411 * 412 * XXX Actually, association/policy database is not yet 413 * XXX able to cope with arbitrary sockaddr families. 414 * XXX When it can, remove this -EINVAL. -DaveM 415 */ 416 return -EINVAL; 417 } 418 419 return 0; 420 } 421 422 static inline int sadb_key_len(const struct sadb_key *key) 423 { 424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 425 426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 427 sizeof(uint64_t)); 428 } 429 430 static int verify_key_len(const void *p) 431 { 432 const struct sadb_key *key = p; 433 434 if (sadb_key_len(key) > key->sadb_key_len) 435 return -EINVAL; 436 437 return 0; 438 } 439 440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 441 { 442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 443 sec_ctx->sadb_x_ctx_len, 444 sizeof(uint64_t)); 445 } 446 447 static inline int verify_sec_ctx_len(const void *p) 448 { 449 const struct sadb_x_sec_ctx *sec_ctx = p; 450 int len = sec_ctx->sadb_x_ctx_len; 451 452 if (len > PAGE_SIZE) 453 return -EINVAL; 454 455 len = pfkey_sec_ctx_len(sec_ctx); 456 457 if (sec_ctx->sadb_x_sec_len != len) 458 return -EINVAL; 459 460 return 0; 461 } 462 463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 464 gfp_t gfp) 465 { 466 struct xfrm_user_sec_ctx *uctx = NULL; 467 int ctx_size = sec_ctx->sadb_x_ctx_len; 468 469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 470 471 if (!uctx) 472 return NULL; 473 474 uctx->len = pfkey_sec_ctx_len(sec_ctx); 475 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 479 memcpy(uctx + 1, sec_ctx + 1, 480 uctx->ctx_len); 481 482 return uctx; 483 } 484 485 static int present_and_same_family(const struct sadb_address *src, 486 const struct sadb_address *dst) 487 { 488 const struct sockaddr *s_addr, *d_addr; 489 490 if (!src || !dst) 491 return 0; 492 493 s_addr = (const struct sockaddr *)(src + 1); 494 d_addr = (const struct sockaddr *)(dst + 1); 495 if (s_addr->sa_family != d_addr->sa_family) 496 return 0; 497 if (s_addr->sa_family != AF_INET 498 #if IS_ENABLED(CONFIG_IPV6) 499 && s_addr->sa_family != AF_INET6 500 #endif 501 ) 502 return 0; 503 504 return 1; 505 } 506 507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 508 { 509 const char *p = (char *) hdr; 510 int len = skb->len; 511 512 len -= sizeof(*hdr); 513 p += sizeof(*hdr); 514 while (len > 0) { 515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 516 uint16_t ext_type; 517 int ext_len; 518 519 if (len < sizeof(*ehdr)) 520 return -EINVAL; 521 522 ext_len = ehdr->sadb_ext_len; 523 ext_len *= sizeof(uint64_t); 524 ext_type = ehdr->sadb_ext_type; 525 if (ext_len < sizeof(uint64_t) || 526 ext_len > len || 527 ext_type == SADB_EXT_RESERVED) 528 return -EINVAL; 529 530 if (ext_type <= SADB_EXT_MAX) { 531 int min = (int) sadb_ext_min_len[ext_type]; 532 if (ext_len < min) 533 return -EINVAL; 534 if (ext_hdrs[ext_type-1] != NULL) 535 return -EINVAL; 536 switch (ext_type) { 537 case SADB_EXT_ADDRESS_SRC: 538 case SADB_EXT_ADDRESS_DST: 539 case SADB_EXT_ADDRESS_PROXY: 540 case SADB_X_EXT_NAT_T_OA: 541 if (verify_address_len(p)) 542 return -EINVAL; 543 break; 544 case SADB_X_EXT_SEC_CTX: 545 if (verify_sec_ctx_len(p)) 546 return -EINVAL; 547 break; 548 case SADB_EXT_KEY_AUTH: 549 case SADB_EXT_KEY_ENCRYPT: 550 if (verify_key_len(p)) 551 return -EINVAL; 552 break; 553 default: 554 break; 555 } 556 ext_hdrs[ext_type-1] = (void *) p; 557 } 558 p += ext_len; 559 len -= ext_len; 560 } 561 562 return 0; 563 } 564 565 static uint16_t 566 pfkey_satype2proto(uint8_t satype) 567 { 568 switch (satype) { 569 case SADB_SATYPE_UNSPEC: 570 return IPSEC_PROTO_ANY; 571 case SADB_SATYPE_AH: 572 return IPPROTO_AH; 573 case SADB_SATYPE_ESP: 574 return IPPROTO_ESP; 575 case SADB_X_SATYPE_IPCOMP: 576 return IPPROTO_COMP; 577 default: 578 return 0; 579 } 580 /* NOTREACHED */ 581 } 582 583 static uint8_t 584 pfkey_proto2satype(uint16_t proto) 585 { 586 switch (proto) { 587 case IPPROTO_AH: 588 return SADB_SATYPE_AH; 589 case IPPROTO_ESP: 590 return SADB_SATYPE_ESP; 591 case IPPROTO_COMP: 592 return SADB_X_SATYPE_IPCOMP; 593 default: 594 return 0; 595 } 596 /* NOTREACHED */ 597 } 598 599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 600 * say specifically 'just raw sockets' as we encode them as 255. 601 */ 602 603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 604 { 605 return proto == IPSEC_PROTO_ANY ? 0 : proto; 606 } 607 608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 609 { 610 return proto ? proto : IPSEC_PROTO_ANY; 611 } 612 613 static inline int pfkey_sockaddr_len(sa_family_t family) 614 { 615 switch (family) { 616 case AF_INET: 617 return sizeof(struct sockaddr_in); 618 #if IS_ENABLED(CONFIG_IPV6) 619 case AF_INET6: 620 return sizeof(struct sockaddr_in6); 621 #endif 622 } 623 return 0; 624 } 625 626 static 627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 628 { 629 switch (sa->sa_family) { 630 case AF_INET: 631 xaddr->a4 = 632 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 633 return AF_INET; 634 #if IS_ENABLED(CONFIG_IPV6) 635 case AF_INET6: 636 memcpy(xaddr->a6, 637 &((struct sockaddr_in6 *)sa)->sin6_addr, 638 sizeof(struct in6_addr)); 639 return AF_INET6; 640 #endif 641 } 642 return 0; 643 } 644 645 static 646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 647 { 648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 649 xaddr); 650 } 651 652 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 653 { 654 const struct sadb_sa *sa; 655 const struct sadb_address *addr; 656 uint16_t proto; 657 unsigned short family; 658 xfrm_address_t *xaddr; 659 660 sa = ext_hdrs[SADB_EXT_SA - 1]; 661 if (sa == NULL) 662 return NULL; 663 664 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 665 if (proto == 0) 666 return NULL; 667 668 /* sadb_address_len should be checked by caller */ 669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 670 if (addr == NULL) 671 return NULL; 672 673 family = ((const struct sockaddr *)(addr + 1))->sa_family; 674 switch (family) { 675 case AF_INET: 676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 677 break; 678 #if IS_ENABLED(CONFIG_IPV6) 679 case AF_INET6: 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 681 break; 682 #endif 683 default: 684 xaddr = NULL; 685 } 686 687 if (!xaddr) 688 return NULL; 689 690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 691 } 692 693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 694 695 static int 696 pfkey_sockaddr_size(sa_family_t family) 697 { 698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 699 } 700 701 static inline int pfkey_mode_from_xfrm(int mode) 702 { 703 switch(mode) { 704 case XFRM_MODE_TRANSPORT: 705 return IPSEC_MODE_TRANSPORT; 706 case XFRM_MODE_TUNNEL: 707 return IPSEC_MODE_TUNNEL; 708 case XFRM_MODE_BEET: 709 return IPSEC_MODE_BEET; 710 default: 711 return -1; 712 } 713 } 714 715 static inline int pfkey_mode_to_xfrm(int mode) 716 { 717 switch(mode) { 718 case IPSEC_MODE_ANY: /*XXX*/ 719 case IPSEC_MODE_TRANSPORT: 720 return XFRM_MODE_TRANSPORT; 721 case IPSEC_MODE_TUNNEL: 722 return XFRM_MODE_TUNNEL; 723 case IPSEC_MODE_BEET: 724 return XFRM_MODE_BEET; 725 default: 726 return -1; 727 } 728 } 729 730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 731 struct sockaddr *sa, 732 unsigned short family) 733 { 734 switch (family) { 735 case AF_INET: 736 { 737 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 738 sin->sin_family = AF_INET; 739 sin->sin_port = port; 740 sin->sin_addr.s_addr = xaddr->a4; 741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 742 return 32; 743 } 744 #if IS_ENABLED(CONFIG_IPV6) 745 case AF_INET6: 746 { 747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 748 sin6->sin6_family = AF_INET6; 749 sin6->sin6_port = port; 750 sin6->sin6_flowinfo = 0; 751 sin6->sin6_addr = xaddr->in6; 752 sin6->sin6_scope_id = 0; 753 return 128; 754 } 755 #endif 756 } 757 return 0; 758 } 759 760 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 761 int add_keys, int hsc) 762 { 763 struct sk_buff *skb; 764 struct sadb_msg *hdr; 765 struct sadb_sa *sa; 766 struct sadb_lifetime *lifetime; 767 struct sadb_address *addr; 768 struct sadb_key *key; 769 struct sadb_x_sa2 *sa2; 770 struct sadb_x_sec_ctx *sec_ctx; 771 struct xfrm_sec_ctx *xfrm_ctx; 772 int ctx_size = 0; 773 int size; 774 int auth_key_size = 0; 775 int encrypt_key_size = 0; 776 int sockaddr_size; 777 struct xfrm_encap_tmpl *natt = NULL; 778 int mode; 779 780 /* address family check */ 781 sockaddr_size = pfkey_sockaddr_size(x->props.family); 782 if (!sockaddr_size) 783 return ERR_PTR(-EINVAL); 784 785 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 786 key(AE), (identity(SD),) (sensitivity)> */ 787 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 788 sizeof(struct sadb_lifetime) + 789 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 790 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 791 sizeof(struct sadb_address)*2 + 792 sockaddr_size*2 + 793 sizeof(struct sadb_x_sa2); 794 795 if ((xfrm_ctx = x->security)) { 796 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 797 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 798 } 799 800 /* identity & sensitivity */ 801 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 802 size += sizeof(struct sadb_address) + sockaddr_size; 803 804 if (add_keys) { 805 if (x->aalg && x->aalg->alg_key_len) { 806 auth_key_size = 807 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 808 size += sizeof(struct sadb_key) + auth_key_size; 809 } 810 if (x->ealg && x->ealg->alg_key_len) { 811 encrypt_key_size = 812 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 813 size += sizeof(struct sadb_key) + encrypt_key_size; 814 } 815 } 816 if (x->encap) 817 natt = x->encap; 818 819 if (natt && natt->encap_type) { 820 size += sizeof(struct sadb_x_nat_t_type); 821 size += sizeof(struct sadb_x_nat_t_port); 822 size += sizeof(struct sadb_x_nat_t_port); 823 } 824 825 skb = alloc_skb(size + 16, GFP_ATOMIC); 826 if (skb == NULL) 827 return ERR_PTR(-ENOBUFS); 828 829 /* call should fill header later */ 830 hdr = skb_put(skb, sizeof(struct sadb_msg)); 831 memset(hdr, 0, size); /* XXX do we need this ? */ 832 hdr->sadb_msg_len = size / sizeof(uint64_t); 833 834 /* sa */ 835 sa = skb_put(skb, sizeof(struct sadb_sa)); 836 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 837 sa->sadb_sa_exttype = SADB_EXT_SA; 838 sa->sadb_sa_spi = x->id.spi; 839 sa->sadb_sa_replay = x->props.replay_window; 840 switch (x->km.state) { 841 case XFRM_STATE_VALID: 842 sa->sadb_sa_state = x->km.dying ? 843 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 844 break; 845 case XFRM_STATE_ACQ: 846 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 847 break; 848 default: 849 sa->sadb_sa_state = SADB_SASTATE_DEAD; 850 break; 851 } 852 sa->sadb_sa_auth = 0; 853 if (x->aalg) { 854 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 855 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 856 a->desc.sadb_alg_id : 0; 857 } 858 sa->sadb_sa_encrypt = 0; 859 BUG_ON(x->ealg && x->calg); 860 if (x->ealg) { 861 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 862 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 863 a->desc.sadb_alg_id : 0; 864 } 865 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 866 if (x->calg) { 867 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 868 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 869 a->desc.sadb_alg_id : 0; 870 } 871 872 sa->sadb_sa_flags = 0; 873 if (x->props.flags & XFRM_STATE_NOECN) 874 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 875 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 876 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 877 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 879 880 /* hard time */ 881 if (hsc & 2) { 882 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 883 lifetime->sadb_lifetime_len = 884 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 885 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 886 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 887 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 888 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 889 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 890 } 891 /* soft time */ 892 if (hsc & 1) { 893 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 894 lifetime->sadb_lifetime_len = 895 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 896 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 897 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 898 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 899 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 900 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 901 } 902 /* current time */ 903 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 904 lifetime->sadb_lifetime_len = 905 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 906 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 907 lifetime->sadb_lifetime_allocations = x->curlft.packets; 908 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 909 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 910 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 911 /* src address */ 912 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 913 addr->sadb_address_len = 914 (sizeof(struct sadb_address)+sockaddr_size)/ 915 sizeof(uint64_t); 916 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 917 /* "if the ports are non-zero, then the sadb_address_proto field, 918 normally zero, MUST be filled in with the transport 919 protocol's number." - RFC2367 */ 920 addr->sadb_address_proto = 0; 921 addr->sadb_address_reserved = 0; 922 923 addr->sadb_address_prefixlen = 924 pfkey_sockaddr_fill(&x->props.saddr, 0, 925 (struct sockaddr *) (addr + 1), 926 x->props.family); 927 BUG_ON(!addr->sadb_address_prefixlen); 928 929 /* dst address */ 930 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 931 addr->sadb_address_len = 932 (sizeof(struct sadb_address)+sockaddr_size)/ 933 sizeof(uint64_t); 934 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 935 addr->sadb_address_proto = 0; 936 addr->sadb_address_reserved = 0; 937 938 addr->sadb_address_prefixlen = 939 pfkey_sockaddr_fill(&x->id.daddr, 0, 940 (struct sockaddr *) (addr + 1), 941 x->props.family); 942 BUG_ON(!addr->sadb_address_prefixlen); 943 944 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 945 x->props.family)) { 946 addr = skb_put(skb, 947 sizeof(struct sadb_address) + sockaddr_size); 948 addr->sadb_address_len = 949 (sizeof(struct sadb_address)+sockaddr_size)/ 950 sizeof(uint64_t); 951 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 952 addr->sadb_address_proto = 953 pfkey_proto_from_xfrm(x->sel.proto); 954 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 955 addr->sadb_address_reserved = 0; 956 957 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 958 (struct sockaddr *) (addr + 1), 959 x->props.family); 960 } 961 962 /* auth key */ 963 if (add_keys && auth_key_size) { 964 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 965 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 966 sizeof(uint64_t); 967 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 968 key->sadb_key_bits = x->aalg->alg_key_len; 969 key->sadb_key_reserved = 0; 970 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 971 } 972 /* encrypt key */ 973 if (add_keys && encrypt_key_size) { 974 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 975 key->sadb_key_len = (sizeof(struct sadb_key) + 976 encrypt_key_size) / sizeof(uint64_t); 977 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 978 key->sadb_key_bits = x->ealg->alg_key_len; 979 key->sadb_key_reserved = 0; 980 memcpy(key + 1, x->ealg->alg_key, 981 (x->ealg->alg_key_len+7)/8); 982 } 983 984 /* sa */ 985 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 986 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 987 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 988 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 989 kfree_skb(skb); 990 return ERR_PTR(-EINVAL); 991 } 992 sa2->sadb_x_sa2_mode = mode; 993 sa2->sadb_x_sa2_reserved1 = 0; 994 sa2->sadb_x_sa2_reserved2 = 0; 995 sa2->sadb_x_sa2_sequence = 0; 996 sa2->sadb_x_sa2_reqid = x->props.reqid; 997 998 if (natt && natt->encap_type) { 999 struct sadb_x_nat_t_type *n_type; 1000 struct sadb_x_nat_t_port *n_port; 1001 1002 /* type */ 1003 n_type = skb_put(skb, sizeof(*n_type)); 1004 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1005 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1006 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1007 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1008 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1009 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1010 1011 /* source port */ 1012 n_port = skb_put(skb, sizeof(*n_port)); 1013 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1014 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1015 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1016 n_port->sadb_x_nat_t_port_reserved = 0; 1017 1018 /* dest port */ 1019 n_port = skb_put(skb, sizeof(*n_port)); 1020 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1021 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1022 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1023 n_port->sadb_x_nat_t_port_reserved = 0; 1024 } 1025 1026 /* security context */ 1027 if (xfrm_ctx) { 1028 sec_ctx = skb_put(skb, 1029 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1030 sec_ctx->sadb_x_sec_len = 1031 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1032 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1033 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1034 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1035 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1036 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1037 xfrm_ctx->ctx_len); 1038 } 1039 1040 return skb; 1041 } 1042 1043 1044 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1045 { 1046 struct sk_buff *skb; 1047 1048 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1049 1050 return skb; 1051 } 1052 1053 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1054 int hsc) 1055 { 1056 return __pfkey_xfrm_state2msg(x, 0, hsc); 1057 } 1058 1059 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1060 const struct sadb_msg *hdr, 1061 void * const *ext_hdrs) 1062 { 1063 struct xfrm_state *x; 1064 const struct sadb_lifetime *lifetime; 1065 const struct sadb_sa *sa; 1066 const struct sadb_key *key; 1067 const struct sadb_x_sec_ctx *sec_ctx; 1068 uint16_t proto; 1069 int err; 1070 1071 1072 sa = ext_hdrs[SADB_EXT_SA - 1]; 1073 if (!sa || 1074 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1075 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1076 return ERR_PTR(-EINVAL); 1077 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1078 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1079 return ERR_PTR(-EINVAL); 1080 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1081 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1082 return ERR_PTR(-EINVAL); 1083 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1084 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1085 return ERR_PTR(-EINVAL); 1086 1087 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1088 if (proto == 0) 1089 return ERR_PTR(-EINVAL); 1090 1091 /* default error is no buffer space */ 1092 err = -ENOBUFS; 1093 1094 /* RFC2367: 1095 1096 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1097 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1098 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1099 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1100 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1101 not true. 1102 1103 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1104 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1105 */ 1106 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1107 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1108 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1109 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1110 return ERR_PTR(-EINVAL); 1111 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1112 if (key != NULL && 1113 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1114 key->sadb_key_bits == 0) 1115 return ERR_PTR(-EINVAL); 1116 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1117 if (key != NULL && 1118 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1119 key->sadb_key_bits == 0) 1120 return ERR_PTR(-EINVAL); 1121 1122 x = xfrm_state_alloc(net); 1123 if (x == NULL) 1124 return ERR_PTR(-ENOBUFS); 1125 1126 x->id.proto = proto; 1127 x->id.spi = sa->sadb_sa_spi; 1128 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1129 (sizeof(x->replay.bitmap) * 8)); 1130 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1131 x->props.flags |= XFRM_STATE_NOECN; 1132 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1133 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1135 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1136 1137 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1138 if (lifetime != NULL) { 1139 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1140 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1141 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1142 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1143 } 1144 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1145 if (lifetime != NULL) { 1146 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1147 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1148 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1149 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1150 } 1151 1152 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1153 if (sec_ctx != NULL) { 1154 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1155 1156 if (!uctx) 1157 goto out; 1158 1159 err = security_xfrm_state_alloc(x, uctx); 1160 kfree(uctx); 1161 1162 if (err) 1163 goto out; 1164 } 1165 1166 err = -ENOBUFS; 1167 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1168 if (sa->sadb_sa_auth) { 1169 int keysize = 0; 1170 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1171 if (!a || !a->pfkey_supported) { 1172 err = -ENOSYS; 1173 goto out; 1174 } 1175 if (key) 1176 keysize = (key->sadb_key_bits + 7) / 8; 1177 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1178 if (!x->aalg) { 1179 err = -ENOMEM; 1180 goto out; 1181 } 1182 strcpy(x->aalg->alg_name, a->name); 1183 x->aalg->alg_key_len = 0; 1184 if (key) { 1185 x->aalg->alg_key_len = key->sadb_key_bits; 1186 memcpy(x->aalg->alg_key, key+1, keysize); 1187 } 1188 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1189 x->props.aalgo = sa->sadb_sa_auth; 1190 /* x->algo.flags = sa->sadb_sa_flags; */ 1191 } 1192 if (sa->sadb_sa_encrypt) { 1193 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1194 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1195 if (!a || !a->pfkey_supported) { 1196 err = -ENOSYS; 1197 goto out; 1198 } 1199 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1200 if (!x->calg) { 1201 err = -ENOMEM; 1202 goto out; 1203 } 1204 strcpy(x->calg->alg_name, a->name); 1205 x->props.calgo = sa->sadb_sa_encrypt; 1206 } else { 1207 int keysize = 0; 1208 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1209 if (!a || !a->pfkey_supported) { 1210 err = -ENOSYS; 1211 goto out; 1212 } 1213 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1214 if (key) 1215 keysize = (key->sadb_key_bits + 7) / 8; 1216 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1217 if (!x->ealg) { 1218 err = -ENOMEM; 1219 goto out; 1220 } 1221 strcpy(x->ealg->alg_name, a->name); 1222 x->ealg->alg_key_len = 0; 1223 if (key) { 1224 x->ealg->alg_key_len = key->sadb_key_bits; 1225 memcpy(x->ealg->alg_key, key+1, keysize); 1226 } 1227 x->props.ealgo = sa->sadb_sa_encrypt; 1228 x->geniv = a->uinfo.encr.geniv; 1229 } 1230 } 1231 /* x->algo.flags = sa->sadb_sa_flags; */ 1232 1233 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1234 &x->props.saddr); 1235 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1236 &x->id.daddr); 1237 1238 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1239 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1240 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1241 if (mode < 0) { 1242 err = -EINVAL; 1243 goto out; 1244 } 1245 x->props.mode = mode; 1246 x->props.reqid = sa2->sadb_x_sa2_reqid; 1247 } 1248 1249 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1250 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1251 1252 /* Nobody uses this, but we try. */ 1253 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1254 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1255 } 1256 1257 if (!x->sel.family) 1258 x->sel.family = x->props.family; 1259 1260 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1261 const struct sadb_x_nat_t_type* n_type; 1262 struct xfrm_encap_tmpl *natt; 1263 1264 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1265 if (!x->encap) { 1266 err = -ENOMEM; 1267 goto out; 1268 } 1269 1270 natt = x->encap; 1271 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1272 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1273 1274 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1275 const struct sadb_x_nat_t_port *n_port = 1276 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1277 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1278 } 1279 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1280 const struct sadb_x_nat_t_port *n_port = 1281 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1282 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1283 } 1284 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1285 } 1286 1287 err = xfrm_init_state(x); 1288 if (err) 1289 goto out; 1290 1291 x->km.seq = hdr->sadb_msg_seq; 1292 return x; 1293 1294 out: 1295 x->km.state = XFRM_STATE_DEAD; 1296 xfrm_state_put(x); 1297 return ERR_PTR(err); 1298 } 1299 1300 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1301 { 1302 return -EOPNOTSUPP; 1303 } 1304 1305 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1306 { 1307 struct net *net = sock_net(sk); 1308 struct sk_buff *resp_skb; 1309 struct sadb_x_sa2 *sa2; 1310 struct sadb_address *saddr, *daddr; 1311 struct sadb_msg *out_hdr; 1312 struct sadb_spirange *range; 1313 struct xfrm_state *x = NULL; 1314 int mode; 1315 int err; 1316 u32 min_spi, max_spi; 1317 u32 reqid; 1318 u8 proto; 1319 unsigned short family; 1320 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1321 1322 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1323 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1324 return -EINVAL; 1325 1326 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1327 if (proto == 0) 1328 return -EINVAL; 1329 1330 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1331 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1332 if (mode < 0) 1333 return -EINVAL; 1334 reqid = sa2->sadb_x_sa2_reqid; 1335 } else { 1336 mode = 0; 1337 reqid = 0; 1338 } 1339 1340 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1341 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1342 1343 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1344 switch (family) { 1345 case AF_INET: 1346 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1347 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1348 break; 1349 #if IS_ENABLED(CONFIG_IPV6) 1350 case AF_INET6: 1351 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1352 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1353 break; 1354 #endif 1355 } 1356 1357 if (hdr->sadb_msg_seq) { 1358 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1359 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1360 xfrm_state_put(x); 1361 x = NULL; 1362 } 1363 } 1364 1365 if (!x) 1366 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); 1367 1368 if (x == NULL) 1369 return -ENOENT; 1370 1371 min_spi = 0x100; 1372 max_spi = 0x0fffffff; 1373 1374 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1375 if (range) { 1376 min_spi = range->sadb_spirange_min; 1377 max_spi = range->sadb_spirange_max; 1378 } 1379 1380 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1381 if (err) { 1382 xfrm_state_put(x); 1383 return err; 1384 } 1385 1386 err = xfrm_alloc_spi(x, min_spi, max_spi); 1387 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1388 1389 if (IS_ERR(resp_skb)) { 1390 xfrm_state_put(x); 1391 return PTR_ERR(resp_skb); 1392 } 1393 1394 out_hdr = (struct sadb_msg *) resp_skb->data; 1395 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1396 out_hdr->sadb_msg_type = SADB_GETSPI; 1397 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1398 out_hdr->sadb_msg_errno = 0; 1399 out_hdr->sadb_msg_reserved = 0; 1400 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1401 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1402 1403 xfrm_state_put(x); 1404 1405 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1406 1407 return 0; 1408 } 1409 1410 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1411 { 1412 struct net *net = sock_net(sk); 1413 struct xfrm_state *x; 1414 1415 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1416 return -EOPNOTSUPP; 1417 1418 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1419 return 0; 1420 1421 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1422 if (x == NULL) 1423 return 0; 1424 1425 spin_lock_bh(&x->lock); 1426 if (x->km.state == XFRM_STATE_ACQ) 1427 x->km.state = XFRM_STATE_ERROR; 1428 1429 spin_unlock_bh(&x->lock); 1430 xfrm_state_put(x); 1431 return 0; 1432 } 1433 1434 static inline int event2poltype(int event) 1435 { 1436 switch (event) { 1437 case XFRM_MSG_DELPOLICY: 1438 return SADB_X_SPDDELETE; 1439 case XFRM_MSG_NEWPOLICY: 1440 return SADB_X_SPDADD; 1441 case XFRM_MSG_UPDPOLICY: 1442 return SADB_X_SPDUPDATE; 1443 case XFRM_MSG_POLEXPIRE: 1444 // return SADB_X_SPDEXPIRE; 1445 default: 1446 pr_err("pfkey: Unknown policy event %d\n", event); 1447 break; 1448 } 1449 1450 return 0; 1451 } 1452 1453 static inline int event2keytype(int event) 1454 { 1455 switch (event) { 1456 case XFRM_MSG_DELSA: 1457 return SADB_DELETE; 1458 case XFRM_MSG_NEWSA: 1459 return SADB_ADD; 1460 case XFRM_MSG_UPDSA: 1461 return SADB_UPDATE; 1462 case XFRM_MSG_EXPIRE: 1463 return SADB_EXPIRE; 1464 default: 1465 pr_err("pfkey: Unknown SA event %d\n", event); 1466 break; 1467 } 1468 1469 return 0; 1470 } 1471 1472 /* ADD/UPD/DEL */ 1473 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1474 { 1475 struct sk_buff *skb; 1476 struct sadb_msg *hdr; 1477 1478 skb = pfkey_xfrm_state2msg(x); 1479 1480 if (IS_ERR(skb)) 1481 return PTR_ERR(skb); 1482 1483 hdr = (struct sadb_msg *) skb->data; 1484 hdr->sadb_msg_version = PF_KEY_V2; 1485 hdr->sadb_msg_type = event2keytype(c->event); 1486 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1487 hdr->sadb_msg_errno = 0; 1488 hdr->sadb_msg_reserved = 0; 1489 hdr->sadb_msg_seq = c->seq; 1490 hdr->sadb_msg_pid = c->portid; 1491 1492 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1493 1494 return 0; 1495 } 1496 1497 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1498 { 1499 struct net *net = sock_net(sk); 1500 struct xfrm_state *x; 1501 int err; 1502 struct km_event c; 1503 1504 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1505 if (IS_ERR(x)) 1506 return PTR_ERR(x); 1507 1508 xfrm_state_hold(x); 1509 if (hdr->sadb_msg_type == SADB_ADD) 1510 err = xfrm_state_add(x); 1511 else 1512 err = xfrm_state_update(x); 1513 1514 xfrm_audit_state_add(x, err ? 0 : 1, true); 1515 1516 if (err < 0) { 1517 x->km.state = XFRM_STATE_DEAD; 1518 __xfrm_state_put(x); 1519 goto out; 1520 } 1521 1522 if (hdr->sadb_msg_type == SADB_ADD) 1523 c.event = XFRM_MSG_NEWSA; 1524 else 1525 c.event = XFRM_MSG_UPDSA; 1526 c.seq = hdr->sadb_msg_seq; 1527 c.portid = hdr->sadb_msg_pid; 1528 km_state_notify(x, &c); 1529 out: 1530 xfrm_state_put(x); 1531 return err; 1532 } 1533 1534 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1535 { 1536 struct net *net = sock_net(sk); 1537 struct xfrm_state *x; 1538 struct km_event c; 1539 int err; 1540 1541 if (!ext_hdrs[SADB_EXT_SA-1] || 1542 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1543 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1544 return -EINVAL; 1545 1546 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1547 if (x == NULL) 1548 return -ESRCH; 1549 1550 if ((err = security_xfrm_state_delete(x))) 1551 goto out; 1552 1553 if (xfrm_state_kern(x)) { 1554 err = -EPERM; 1555 goto out; 1556 } 1557 1558 err = xfrm_state_delete(x); 1559 1560 if (err < 0) 1561 goto out; 1562 1563 c.seq = hdr->sadb_msg_seq; 1564 c.portid = hdr->sadb_msg_pid; 1565 c.event = XFRM_MSG_DELSA; 1566 km_state_notify(x, &c); 1567 out: 1568 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1569 xfrm_state_put(x); 1570 1571 return err; 1572 } 1573 1574 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1575 { 1576 struct net *net = sock_net(sk); 1577 __u8 proto; 1578 struct sk_buff *out_skb; 1579 struct sadb_msg *out_hdr; 1580 struct xfrm_state *x; 1581 1582 if (!ext_hdrs[SADB_EXT_SA-1] || 1583 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1584 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1585 return -EINVAL; 1586 1587 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1588 if (x == NULL) 1589 return -ESRCH; 1590 1591 out_skb = pfkey_xfrm_state2msg(x); 1592 proto = x->id.proto; 1593 xfrm_state_put(x); 1594 if (IS_ERR(out_skb)) 1595 return PTR_ERR(out_skb); 1596 1597 out_hdr = (struct sadb_msg *) out_skb->data; 1598 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1599 out_hdr->sadb_msg_type = SADB_GET; 1600 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1601 out_hdr->sadb_msg_errno = 0; 1602 out_hdr->sadb_msg_reserved = 0; 1603 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1604 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1605 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1606 1607 return 0; 1608 } 1609 1610 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1611 gfp_t allocation) 1612 { 1613 struct sk_buff *skb; 1614 struct sadb_msg *hdr; 1615 int len, auth_len, enc_len, i; 1616 1617 auth_len = xfrm_count_pfkey_auth_supported(); 1618 if (auth_len) { 1619 auth_len *= sizeof(struct sadb_alg); 1620 auth_len += sizeof(struct sadb_supported); 1621 } 1622 1623 enc_len = xfrm_count_pfkey_enc_supported(); 1624 if (enc_len) { 1625 enc_len *= sizeof(struct sadb_alg); 1626 enc_len += sizeof(struct sadb_supported); 1627 } 1628 1629 len = enc_len + auth_len + sizeof(struct sadb_msg); 1630 1631 skb = alloc_skb(len + 16, allocation); 1632 if (!skb) 1633 goto out_put_algs; 1634 1635 hdr = skb_put(skb, sizeof(*hdr)); 1636 pfkey_hdr_dup(hdr, orig); 1637 hdr->sadb_msg_errno = 0; 1638 hdr->sadb_msg_len = len / sizeof(uint64_t); 1639 1640 if (auth_len) { 1641 struct sadb_supported *sp; 1642 struct sadb_alg *ap; 1643 1644 sp = skb_put(skb, auth_len); 1645 ap = (struct sadb_alg *) (sp + 1); 1646 1647 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1648 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1649 1650 for (i = 0; ; i++) { 1651 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1652 if (!aalg) 1653 break; 1654 if (!aalg->pfkey_supported) 1655 continue; 1656 if (aalg->available) 1657 *ap++ = aalg->desc; 1658 } 1659 } 1660 1661 if (enc_len) { 1662 struct sadb_supported *sp; 1663 struct sadb_alg *ap; 1664 1665 sp = skb_put(skb, enc_len); 1666 ap = (struct sadb_alg *) (sp + 1); 1667 1668 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1669 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1670 1671 for (i = 0; ; i++) { 1672 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1673 if (!ealg) 1674 break; 1675 if (!ealg->pfkey_supported) 1676 continue; 1677 if (ealg->available) 1678 *ap++ = ealg->desc; 1679 } 1680 } 1681 1682 out_put_algs: 1683 return skb; 1684 } 1685 1686 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1687 { 1688 struct pfkey_sock *pfk = pfkey_sk(sk); 1689 struct sk_buff *supp_skb; 1690 1691 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1692 return -EINVAL; 1693 1694 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1695 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1696 return -EEXIST; 1697 pfk->registered |= (1<<hdr->sadb_msg_satype); 1698 } 1699 1700 xfrm_probe_algs(); 1701 1702 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); 1703 if (!supp_skb) { 1704 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1705 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1706 1707 return -ENOBUFS; 1708 } 1709 1710 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1711 sock_net(sk)); 1712 return 0; 1713 } 1714 1715 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1716 { 1717 struct sk_buff *skb; 1718 struct sadb_msg *hdr; 1719 1720 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1721 if (!skb) 1722 return -ENOBUFS; 1723 1724 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1725 hdr->sadb_msg_errno = (uint8_t) 0; 1726 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1727 1728 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1729 sock_net(sk)); 1730 } 1731 1732 static int key_notify_sa_flush(const struct km_event *c) 1733 { 1734 struct sk_buff *skb; 1735 struct sadb_msg *hdr; 1736 1737 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1738 if (!skb) 1739 return -ENOBUFS; 1740 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1741 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1742 hdr->sadb_msg_type = SADB_FLUSH; 1743 hdr->sadb_msg_seq = c->seq; 1744 hdr->sadb_msg_pid = c->portid; 1745 hdr->sadb_msg_version = PF_KEY_V2; 1746 hdr->sadb_msg_errno = (uint8_t) 0; 1747 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1748 hdr->sadb_msg_reserved = 0; 1749 1750 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1751 1752 return 0; 1753 } 1754 1755 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1756 { 1757 struct net *net = sock_net(sk); 1758 unsigned int proto; 1759 struct km_event c; 1760 int err, err2; 1761 1762 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1763 if (proto == 0) 1764 return -EINVAL; 1765 1766 err = xfrm_state_flush(net, proto, true, false); 1767 err2 = unicast_flush_resp(sk, hdr); 1768 if (err || err2) { 1769 if (err == -ESRCH) /* empty table - go quietly */ 1770 err = 0; 1771 return err ? err : err2; 1772 } 1773 1774 c.data.proto = proto; 1775 c.seq = hdr->sadb_msg_seq; 1776 c.portid = hdr->sadb_msg_pid; 1777 c.event = XFRM_MSG_FLUSHSA; 1778 c.net = net; 1779 km_state_notify(NULL, &c); 1780 1781 return 0; 1782 } 1783 1784 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1785 { 1786 struct pfkey_sock *pfk = ptr; 1787 struct sk_buff *out_skb; 1788 struct sadb_msg *out_hdr; 1789 1790 if (!pfkey_can_dump(&pfk->sk)) 1791 return -ENOBUFS; 1792 1793 out_skb = pfkey_xfrm_state2msg(x); 1794 if (IS_ERR(out_skb)) 1795 return PTR_ERR(out_skb); 1796 1797 out_hdr = (struct sadb_msg *) out_skb->data; 1798 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1799 out_hdr->sadb_msg_type = SADB_DUMP; 1800 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1801 out_hdr->sadb_msg_errno = 0; 1802 out_hdr->sadb_msg_reserved = 0; 1803 out_hdr->sadb_msg_seq = count + 1; 1804 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1805 1806 if (pfk->dump.skb) 1807 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1808 &pfk->sk, sock_net(&pfk->sk)); 1809 pfk->dump.skb = out_skb; 1810 1811 return 0; 1812 } 1813 1814 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1815 { 1816 struct net *net = sock_net(&pfk->sk); 1817 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1818 } 1819 1820 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1821 { 1822 struct net *net = sock_net(&pfk->sk); 1823 1824 xfrm_state_walk_done(&pfk->dump.u.state, net); 1825 } 1826 1827 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1828 { 1829 u8 proto; 1830 struct xfrm_address_filter *filter = NULL; 1831 struct pfkey_sock *pfk = pfkey_sk(sk); 1832 1833 mutex_lock(&pfk->dump_lock); 1834 if (pfk->dump.dump != NULL) { 1835 mutex_unlock(&pfk->dump_lock); 1836 return -EBUSY; 1837 } 1838 1839 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1840 if (proto == 0) { 1841 mutex_unlock(&pfk->dump_lock); 1842 return -EINVAL; 1843 } 1844 1845 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1846 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1847 1848 if ((xfilter->sadb_x_filter_splen >= 1849 (sizeof(xfrm_address_t) << 3)) || 1850 (xfilter->sadb_x_filter_dplen >= 1851 (sizeof(xfrm_address_t) << 3))) { 1852 mutex_unlock(&pfk->dump_lock); 1853 return -EINVAL; 1854 } 1855 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1856 if (filter == NULL) { 1857 mutex_unlock(&pfk->dump_lock); 1858 return -ENOMEM; 1859 } 1860 1861 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1862 sizeof(xfrm_address_t)); 1863 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1864 sizeof(xfrm_address_t)); 1865 filter->family = xfilter->sadb_x_filter_family; 1866 filter->splen = xfilter->sadb_x_filter_splen; 1867 filter->dplen = xfilter->sadb_x_filter_dplen; 1868 } 1869 1870 pfk->dump.msg_version = hdr->sadb_msg_version; 1871 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1872 pfk->dump.dump = pfkey_dump_sa; 1873 pfk->dump.done = pfkey_dump_sa_done; 1874 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1875 mutex_unlock(&pfk->dump_lock); 1876 1877 return pfkey_do_dump(pfk); 1878 } 1879 1880 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1881 { 1882 struct pfkey_sock *pfk = pfkey_sk(sk); 1883 int satype = hdr->sadb_msg_satype; 1884 bool reset_errno = false; 1885 1886 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1887 reset_errno = true; 1888 if (satype != 0 && satype != 1) 1889 return -EINVAL; 1890 pfk->promisc = satype; 1891 } 1892 if (reset_errno && skb_cloned(skb)) 1893 skb = skb_copy(skb, GFP_KERNEL); 1894 else 1895 skb = skb_clone(skb, GFP_KERNEL); 1896 1897 if (reset_errno && skb) { 1898 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1899 new_hdr->sadb_msg_errno = 0; 1900 } 1901 1902 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1903 return 0; 1904 } 1905 1906 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1907 { 1908 int i; 1909 u32 reqid = *(u32*)ptr; 1910 1911 for (i=0; i<xp->xfrm_nr; i++) { 1912 if (xp->xfrm_vec[i].reqid == reqid) 1913 return -EEXIST; 1914 } 1915 return 0; 1916 } 1917 1918 static u32 gen_reqid(struct net *net) 1919 { 1920 struct xfrm_policy_walk walk; 1921 u32 start; 1922 int rc; 1923 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1924 1925 start = reqid; 1926 do { 1927 ++reqid; 1928 if (reqid == 0) 1929 reqid = IPSEC_MANUAL_REQID_MAX+1; 1930 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1931 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1932 xfrm_policy_walk_done(&walk, net); 1933 if (rc != -EEXIST) 1934 return reqid; 1935 } while (reqid != start); 1936 return 0; 1937 } 1938 1939 static int 1940 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1941 { 1942 struct net *net = xp_net(xp); 1943 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1944 int mode; 1945 1946 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1947 return -ELOOP; 1948 1949 if (rq->sadb_x_ipsecrequest_mode == 0) 1950 return -EINVAL; 1951 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1952 return -EINVAL; 1953 1954 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1955 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1956 return -EINVAL; 1957 t->mode = mode; 1958 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1959 t->optional = 1; 1960 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1961 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1962 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1963 t->reqid = 0; 1964 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1965 return -ENOBUFS; 1966 } 1967 1968 /* addresses present only in tunnel mode */ 1969 if (t->mode == XFRM_MODE_TUNNEL) { 1970 int err; 1971 1972 err = parse_sockaddr_pair( 1973 (struct sockaddr *)(rq + 1), 1974 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1975 &t->saddr, &t->id.daddr, &t->encap_family); 1976 if (err) 1977 return err; 1978 } else 1979 t->encap_family = xp->family; 1980 1981 /* No way to set this via kame pfkey */ 1982 t->allalgs = 1; 1983 xp->xfrm_nr++; 1984 return 0; 1985 } 1986 1987 static int 1988 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1989 { 1990 int err; 1991 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1992 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1993 1994 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1995 return -EINVAL; 1996 1997 while (len >= sizeof(*rq)) { 1998 if (len < rq->sadb_x_ipsecrequest_len || 1999 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2000 return -EINVAL; 2001 2002 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2003 return err; 2004 len -= rq->sadb_x_ipsecrequest_len; 2005 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2006 } 2007 return 0; 2008 } 2009 2010 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2011 { 2012 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2013 2014 if (xfrm_ctx) { 2015 int len = sizeof(struct sadb_x_sec_ctx); 2016 len += xfrm_ctx->ctx_len; 2017 return PFKEY_ALIGN8(len); 2018 } 2019 return 0; 2020 } 2021 2022 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2023 { 2024 const struct xfrm_tmpl *t; 2025 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2026 int socklen = 0; 2027 int i; 2028 2029 for (i=0; i<xp->xfrm_nr; i++) { 2030 t = xp->xfrm_vec + i; 2031 socklen += pfkey_sockaddr_len(t->encap_family); 2032 } 2033 2034 return sizeof(struct sadb_msg) + 2035 (sizeof(struct sadb_lifetime) * 3) + 2036 (sizeof(struct sadb_address) * 2) + 2037 (sockaddr_size * 2) + 2038 sizeof(struct sadb_x_policy) + 2039 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2040 (socklen * 2) + 2041 pfkey_xfrm_policy2sec_ctx_size(xp); 2042 } 2043 2044 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2045 { 2046 struct sk_buff *skb; 2047 int size; 2048 2049 size = pfkey_xfrm_policy2msg_size(xp); 2050 2051 skb = alloc_skb(size + 16, GFP_ATOMIC); 2052 if (skb == NULL) 2053 return ERR_PTR(-ENOBUFS); 2054 2055 return skb; 2056 } 2057 2058 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2059 { 2060 struct sadb_msg *hdr; 2061 struct sadb_address *addr; 2062 struct sadb_lifetime *lifetime; 2063 struct sadb_x_policy *pol; 2064 struct sadb_x_sec_ctx *sec_ctx; 2065 struct xfrm_sec_ctx *xfrm_ctx; 2066 int i; 2067 int size; 2068 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2069 int socklen = pfkey_sockaddr_len(xp->family); 2070 2071 size = pfkey_xfrm_policy2msg_size(xp); 2072 2073 /* call should fill header later */ 2074 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2075 memset(hdr, 0, size); /* XXX do we need this ? */ 2076 2077 /* src address */ 2078 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2079 addr->sadb_address_len = 2080 (sizeof(struct sadb_address)+sockaddr_size)/ 2081 sizeof(uint64_t); 2082 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2083 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2084 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2085 addr->sadb_address_reserved = 0; 2086 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2087 xp->selector.sport, 2088 (struct sockaddr *) (addr + 1), 2089 xp->family)) 2090 BUG(); 2091 2092 /* dst address */ 2093 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2094 addr->sadb_address_len = 2095 (sizeof(struct sadb_address)+sockaddr_size)/ 2096 sizeof(uint64_t); 2097 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2098 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2099 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2100 addr->sadb_address_reserved = 0; 2101 2102 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2103 (struct sockaddr *) (addr + 1), 2104 xp->family); 2105 2106 /* hard time */ 2107 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2108 lifetime->sadb_lifetime_len = 2109 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2110 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2111 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2112 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2113 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2114 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2115 /* soft time */ 2116 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2117 lifetime->sadb_lifetime_len = 2118 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2119 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2120 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2121 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2122 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2123 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2124 /* current time */ 2125 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2126 lifetime->sadb_lifetime_len = 2127 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2128 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2129 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2130 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2131 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2132 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2133 2134 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2135 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2136 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2137 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2138 if (xp->action == XFRM_POLICY_ALLOW) { 2139 if (xp->xfrm_nr) 2140 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2141 else 2142 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2143 } 2144 pol->sadb_x_policy_dir = dir+1; 2145 pol->sadb_x_policy_reserved = 0; 2146 pol->sadb_x_policy_id = xp->index; 2147 pol->sadb_x_policy_priority = xp->priority; 2148 2149 for (i=0; i<xp->xfrm_nr; i++) { 2150 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2151 struct sadb_x_ipsecrequest *rq; 2152 int req_size; 2153 int mode; 2154 2155 req_size = sizeof(struct sadb_x_ipsecrequest); 2156 if (t->mode == XFRM_MODE_TUNNEL) { 2157 socklen = pfkey_sockaddr_len(t->encap_family); 2158 req_size += socklen * 2; 2159 } else { 2160 size -= 2*socklen; 2161 } 2162 rq = skb_put(skb, req_size); 2163 pol->sadb_x_policy_len += req_size/8; 2164 memset(rq, 0, sizeof(*rq)); 2165 rq->sadb_x_ipsecrequest_len = req_size; 2166 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2167 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2168 return -EINVAL; 2169 rq->sadb_x_ipsecrequest_mode = mode; 2170 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2171 if (t->reqid) 2172 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2173 if (t->optional) 2174 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2175 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2176 2177 if (t->mode == XFRM_MODE_TUNNEL) { 2178 u8 *sa = (void *)(rq + 1); 2179 pfkey_sockaddr_fill(&t->saddr, 0, 2180 (struct sockaddr *)sa, 2181 t->encap_family); 2182 pfkey_sockaddr_fill(&t->id.daddr, 0, 2183 (struct sockaddr *) (sa + socklen), 2184 t->encap_family); 2185 } 2186 } 2187 2188 /* security context */ 2189 if ((xfrm_ctx = xp->security)) { 2190 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2191 2192 sec_ctx = skb_put(skb, ctx_size); 2193 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2194 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2195 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2196 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2197 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2198 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2199 xfrm_ctx->ctx_len); 2200 } 2201 2202 hdr->sadb_msg_len = size / sizeof(uint64_t); 2203 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2204 2205 return 0; 2206 } 2207 2208 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2209 { 2210 struct sk_buff *out_skb; 2211 struct sadb_msg *out_hdr; 2212 int err; 2213 2214 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2215 if (IS_ERR(out_skb)) 2216 return PTR_ERR(out_skb); 2217 2218 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2219 if (err < 0) { 2220 kfree_skb(out_skb); 2221 return err; 2222 } 2223 2224 out_hdr = (struct sadb_msg *) out_skb->data; 2225 out_hdr->sadb_msg_version = PF_KEY_V2; 2226 2227 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2228 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2229 else 2230 out_hdr->sadb_msg_type = event2poltype(c->event); 2231 out_hdr->sadb_msg_errno = 0; 2232 out_hdr->sadb_msg_seq = c->seq; 2233 out_hdr->sadb_msg_pid = c->portid; 2234 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2235 return 0; 2236 2237 } 2238 2239 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2240 { 2241 struct net *net = sock_net(sk); 2242 int err = 0; 2243 struct sadb_lifetime *lifetime; 2244 struct sadb_address *sa; 2245 struct sadb_x_policy *pol; 2246 struct xfrm_policy *xp; 2247 struct km_event c; 2248 struct sadb_x_sec_ctx *sec_ctx; 2249 2250 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2251 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2252 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2253 return -EINVAL; 2254 2255 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2256 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2257 return -EINVAL; 2258 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2259 return -EINVAL; 2260 2261 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2262 if (xp == NULL) 2263 return -ENOBUFS; 2264 2265 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2266 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2267 xp->priority = pol->sadb_x_policy_priority; 2268 2269 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2270 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2271 xp->selector.family = xp->family; 2272 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2273 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2274 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2275 if (xp->selector.sport) 2276 xp->selector.sport_mask = htons(0xffff); 2277 2278 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2279 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2280 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2281 2282 /* Amusing, we set this twice. KAME apps appear to set same value 2283 * in both addresses. 2284 */ 2285 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2286 2287 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2288 if (xp->selector.dport) 2289 xp->selector.dport_mask = htons(0xffff); 2290 2291 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2292 if (sec_ctx != NULL) { 2293 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2294 2295 if (!uctx) { 2296 err = -ENOBUFS; 2297 goto out; 2298 } 2299 2300 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2301 kfree(uctx); 2302 2303 if (err) 2304 goto out; 2305 } 2306 2307 xp->lft.soft_byte_limit = XFRM_INF; 2308 xp->lft.hard_byte_limit = XFRM_INF; 2309 xp->lft.soft_packet_limit = XFRM_INF; 2310 xp->lft.hard_packet_limit = XFRM_INF; 2311 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2312 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2313 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2314 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2315 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2316 } 2317 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2318 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2319 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2320 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2321 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2322 } 2323 xp->xfrm_nr = 0; 2324 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2325 (err = parse_ipsecrequests(xp, pol)) < 0) 2326 goto out; 2327 2328 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2329 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2330 2331 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2332 2333 if (err) 2334 goto out; 2335 2336 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2337 c.event = XFRM_MSG_UPDPOLICY; 2338 else 2339 c.event = XFRM_MSG_NEWPOLICY; 2340 2341 c.seq = hdr->sadb_msg_seq; 2342 c.portid = hdr->sadb_msg_pid; 2343 2344 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2345 xfrm_pol_put(xp); 2346 return 0; 2347 2348 out: 2349 xp->walk.dead = 1; 2350 xfrm_policy_destroy(xp); 2351 return err; 2352 } 2353 2354 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2355 { 2356 struct net *net = sock_net(sk); 2357 int err; 2358 struct sadb_address *sa; 2359 struct sadb_x_policy *pol; 2360 struct xfrm_policy *xp; 2361 struct xfrm_selector sel; 2362 struct km_event c; 2363 struct sadb_x_sec_ctx *sec_ctx; 2364 struct xfrm_sec_ctx *pol_ctx = NULL; 2365 2366 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2367 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2368 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2369 return -EINVAL; 2370 2371 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2372 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2373 return -EINVAL; 2374 2375 memset(&sel, 0, sizeof(sel)); 2376 2377 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2378 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2379 sel.prefixlen_s = sa->sadb_address_prefixlen; 2380 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2381 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2382 if (sel.sport) 2383 sel.sport_mask = htons(0xffff); 2384 2385 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2386 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2387 sel.prefixlen_d = sa->sadb_address_prefixlen; 2388 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2389 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2390 if (sel.dport) 2391 sel.dport_mask = htons(0xffff); 2392 2393 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2394 if (sec_ctx != NULL) { 2395 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2396 2397 if (!uctx) 2398 return -ENOMEM; 2399 2400 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2401 kfree(uctx); 2402 if (err) 2403 return err; 2404 } 2405 2406 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2407 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2408 1, &err); 2409 security_xfrm_policy_free(pol_ctx); 2410 if (xp == NULL) 2411 return -ENOENT; 2412 2413 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2414 2415 if (err) 2416 goto out; 2417 2418 c.seq = hdr->sadb_msg_seq; 2419 c.portid = hdr->sadb_msg_pid; 2420 c.data.byid = 0; 2421 c.event = XFRM_MSG_DELPOLICY; 2422 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2423 2424 out: 2425 xfrm_pol_put(xp); 2426 return err; 2427 } 2428 2429 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2430 { 2431 int err; 2432 struct sk_buff *out_skb; 2433 struct sadb_msg *out_hdr; 2434 err = 0; 2435 2436 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2437 if (IS_ERR(out_skb)) { 2438 err = PTR_ERR(out_skb); 2439 goto out; 2440 } 2441 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2442 if (err < 0) { 2443 kfree_skb(out_skb); 2444 goto out; 2445 } 2446 2447 out_hdr = (struct sadb_msg *) out_skb->data; 2448 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2449 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2450 out_hdr->sadb_msg_satype = 0; 2451 out_hdr->sadb_msg_errno = 0; 2452 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2453 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2454 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2455 err = 0; 2456 2457 out: 2458 return err; 2459 } 2460 2461 static int pfkey_sockaddr_pair_size(sa_family_t family) 2462 { 2463 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2464 } 2465 2466 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2467 xfrm_address_t *saddr, xfrm_address_t *daddr, 2468 u16 *family) 2469 { 2470 int af, socklen; 2471 2472 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2473 return -EINVAL; 2474 2475 af = pfkey_sockaddr_extract(sa, saddr); 2476 if (!af) 2477 return -EINVAL; 2478 2479 socklen = pfkey_sockaddr_len(af); 2480 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2481 daddr) != af) 2482 return -EINVAL; 2483 2484 *family = af; 2485 return 0; 2486 } 2487 2488 #ifdef CONFIG_NET_KEY_MIGRATE 2489 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2490 struct xfrm_migrate *m) 2491 { 2492 int err; 2493 struct sadb_x_ipsecrequest *rq2; 2494 int mode; 2495 2496 if (len < sizeof(*rq1) || 2497 len < rq1->sadb_x_ipsecrequest_len || 2498 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2499 return -EINVAL; 2500 2501 /* old endoints */ 2502 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2503 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2504 &m->old_saddr, &m->old_daddr, 2505 &m->old_family); 2506 if (err) 2507 return err; 2508 2509 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2510 len -= rq1->sadb_x_ipsecrequest_len; 2511 2512 if (len <= sizeof(*rq2) || 2513 len < rq2->sadb_x_ipsecrequest_len || 2514 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2515 return -EINVAL; 2516 2517 /* new endpoints */ 2518 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2519 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2520 &m->new_saddr, &m->new_daddr, 2521 &m->new_family); 2522 if (err) 2523 return err; 2524 2525 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2526 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2527 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2528 return -EINVAL; 2529 2530 m->proto = rq1->sadb_x_ipsecrequest_proto; 2531 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2532 return -EINVAL; 2533 m->mode = mode; 2534 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2535 2536 return ((int)(rq1->sadb_x_ipsecrequest_len + 2537 rq2->sadb_x_ipsecrequest_len)); 2538 } 2539 2540 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2541 const struct sadb_msg *hdr, void * const *ext_hdrs) 2542 { 2543 int i, len, ret, err = -EINVAL; 2544 u8 dir; 2545 struct sadb_address *sa; 2546 struct sadb_x_kmaddress *kma; 2547 struct sadb_x_policy *pol; 2548 struct sadb_x_ipsecrequest *rq; 2549 struct xfrm_selector sel; 2550 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2551 struct xfrm_kmaddress k; 2552 struct net *net = sock_net(sk); 2553 2554 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2555 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2556 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2557 err = -EINVAL; 2558 goto out; 2559 } 2560 2561 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2562 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2563 2564 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2565 err = -EINVAL; 2566 goto out; 2567 } 2568 2569 if (kma) { 2570 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2571 k.reserved = kma->sadb_x_kmaddress_reserved; 2572 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2573 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2574 &k.local, &k.remote, &k.family); 2575 if (ret < 0) { 2576 err = ret; 2577 goto out; 2578 } 2579 } 2580 2581 dir = pol->sadb_x_policy_dir - 1; 2582 memset(&sel, 0, sizeof(sel)); 2583 2584 /* set source address info of selector */ 2585 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2586 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2587 sel.prefixlen_s = sa->sadb_address_prefixlen; 2588 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2589 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2590 if (sel.sport) 2591 sel.sport_mask = htons(0xffff); 2592 2593 /* set destination address info of selector */ 2594 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2595 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2596 sel.prefixlen_d = sa->sadb_address_prefixlen; 2597 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2598 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2599 if (sel.dport) 2600 sel.dport_mask = htons(0xffff); 2601 2602 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2603 2604 /* extract ipsecrequests */ 2605 i = 0; 2606 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2607 2608 while (len > 0 && i < XFRM_MAX_DEPTH) { 2609 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2610 if (ret < 0) { 2611 err = ret; 2612 goto out; 2613 } else { 2614 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2615 len -= ret; 2616 i++; 2617 } 2618 } 2619 2620 if (!i || len > 0) { 2621 err = -EINVAL; 2622 goto out; 2623 } 2624 2625 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2626 kma ? &k : NULL, net, NULL, 0); 2627 2628 out: 2629 return err; 2630 } 2631 #else 2632 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2633 const struct sadb_msg *hdr, void * const *ext_hdrs) 2634 { 2635 return -ENOPROTOOPT; 2636 } 2637 #endif 2638 2639 2640 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2641 { 2642 struct net *net = sock_net(sk); 2643 unsigned int dir; 2644 int err = 0, delete; 2645 struct sadb_x_policy *pol; 2646 struct xfrm_policy *xp; 2647 struct km_event c; 2648 2649 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2650 return -EINVAL; 2651 2652 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2653 if (dir >= XFRM_POLICY_MAX) 2654 return -EINVAL; 2655 2656 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2657 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2658 dir, pol->sadb_x_policy_id, delete, &err); 2659 if (xp == NULL) 2660 return -ENOENT; 2661 2662 if (delete) { 2663 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2664 2665 if (err) 2666 goto out; 2667 c.seq = hdr->sadb_msg_seq; 2668 c.portid = hdr->sadb_msg_pid; 2669 c.data.byid = 1; 2670 c.event = XFRM_MSG_DELPOLICY; 2671 km_policy_notify(xp, dir, &c); 2672 } else { 2673 err = key_pol_get_resp(sk, xp, hdr, dir); 2674 } 2675 2676 out: 2677 xfrm_pol_put(xp); 2678 return err; 2679 } 2680 2681 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2682 { 2683 struct pfkey_sock *pfk = ptr; 2684 struct sk_buff *out_skb; 2685 struct sadb_msg *out_hdr; 2686 int err; 2687 2688 if (!pfkey_can_dump(&pfk->sk)) 2689 return -ENOBUFS; 2690 2691 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2692 if (IS_ERR(out_skb)) 2693 return PTR_ERR(out_skb); 2694 2695 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2696 if (err < 0) { 2697 kfree_skb(out_skb); 2698 return err; 2699 } 2700 2701 out_hdr = (struct sadb_msg *) out_skb->data; 2702 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2703 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2704 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2705 out_hdr->sadb_msg_errno = 0; 2706 out_hdr->sadb_msg_seq = count + 1; 2707 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2708 2709 if (pfk->dump.skb) 2710 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2711 &pfk->sk, sock_net(&pfk->sk)); 2712 pfk->dump.skb = out_skb; 2713 2714 return 0; 2715 } 2716 2717 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2718 { 2719 struct net *net = sock_net(&pfk->sk); 2720 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2721 } 2722 2723 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2724 { 2725 struct net *net = sock_net((struct sock *)pfk); 2726 2727 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2728 } 2729 2730 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2731 { 2732 struct pfkey_sock *pfk = pfkey_sk(sk); 2733 2734 mutex_lock(&pfk->dump_lock); 2735 if (pfk->dump.dump != NULL) { 2736 mutex_unlock(&pfk->dump_lock); 2737 return -EBUSY; 2738 } 2739 2740 pfk->dump.msg_version = hdr->sadb_msg_version; 2741 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2742 pfk->dump.dump = pfkey_dump_sp; 2743 pfk->dump.done = pfkey_dump_sp_done; 2744 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2745 mutex_unlock(&pfk->dump_lock); 2746 2747 return pfkey_do_dump(pfk); 2748 } 2749 2750 static int key_notify_policy_flush(const struct km_event *c) 2751 { 2752 struct sk_buff *skb_out; 2753 struct sadb_msg *hdr; 2754 2755 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2756 if (!skb_out) 2757 return -ENOBUFS; 2758 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2759 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2760 hdr->sadb_msg_seq = c->seq; 2761 hdr->sadb_msg_pid = c->portid; 2762 hdr->sadb_msg_version = PF_KEY_V2; 2763 hdr->sadb_msg_errno = (uint8_t) 0; 2764 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2765 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2766 hdr->sadb_msg_reserved = 0; 2767 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2768 return 0; 2769 2770 } 2771 2772 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2773 { 2774 struct net *net = sock_net(sk); 2775 struct km_event c; 2776 int err, err2; 2777 2778 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2779 err2 = unicast_flush_resp(sk, hdr); 2780 if (err || err2) { 2781 if (err == -ESRCH) /* empty table - old silent behavior */ 2782 return 0; 2783 return err; 2784 } 2785 2786 c.data.type = XFRM_POLICY_TYPE_MAIN; 2787 c.event = XFRM_MSG_FLUSHPOLICY; 2788 c.portid = hdr->sadb_msg_pid; 2789 c.seq = hdr->sadb_msg_seq; 2790 c.net = net; 2791 km_policy_notify(NULL, 0, &c); 2792 2793 return 0; 2794 } 2795 2796 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2797 const struct sadb_msg *hdr, void * const *ext_hdrs); 2798 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2799 [SADB_RESERVED] = pfkey_reserved, 2800 [SADB_GETSPI] = pfkey_getspi, 2801 [SADB_UPDATE] = pfkey_add, 2802 [SADB_ADD] = pfkey_add, 2803 [SADB_DELETE] = pfkey_delete, 2804 [SADB_GET] = pfkey_get, 2805 [SADB_ACQUIRE] = pfkey_acquire, 2806 [SADB_REGISTER] = pfkey_register, 2807 [SADB_EXPIRE] = NULL, 2808 [SADB_FLUSH] = pfkey_flush, 2809 [SADB_DUMP] = pfkey_dump, 2810 [SADB_X_PROMISC] = pfkey_promisc, 2811 [SADB_X_PCHANGE] = NULL, 2812 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2813 [SADB_X_SPDADD] = pfkey_spdadd, 2814 [SADB_X_SPDDELETE] = pfkey_spddelete, 2815 [SADB_X_SPDGET] = pfkey_spdget, 2816 [SADB_X_SPDACQUIRE] = NULL, 2817 [SADB_X_SPDDUMP] = pfkey_spddump, 2818 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2819 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2820 [SADB_X_SPDDELETE2] = pfkey_spdget, 2821 [SADB_X_MIGRATE] = pfkey_migrate, 2822 }; 2823 2824 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2825 { 2826 void *ext_hdrs[SADB_EXT_MAX]; 2827 int err; 2828 2829 /* Non-zero return value of pfkey_broadcast() does not always signal 2830 * an error and even on an actual error we may still want to process 2831 * the message so rather ignore the return value. 2832 */ 2833 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2834 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2835 2836 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2837 err = parse_exthdrs(skb, hdr, ext_hdrs); 2838 if (!err) { 2839 err = -EOPNOTSUPP; 2840 if (pfkey_funcs[hdr->sadb_msg_type]) 2841 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2842 } 2843 return err; 2844 } 2845 2846 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2847 { 2848 struct sadb_msg *hdr = NULL; 2849 2850 if (skb->len < sizeof(*hdr)) { 2851 *errp = -EMSGSIZE; 2852 } else { 2853 hdr = (struct sadb_msg *) skb->data; 2854 if (hdr->sadb_msg_version != PF_KEY_V2 || 2855 hdr->sadb_msg_reserved != 0 || 2856 (hdr->sadb_msg_type <= SADB_RESERVED || 2857 hdr->sadb_msg_type > SADB_MAX)) { 2858 hdr = NULL; 2859 *errp = -EINVAL; 2860 } else if (hdr->sadb_msg_len != (skb->len / 2861 sizeof(uint64_t)) || 2862 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2863 sizeof(uint64_t))) { 2864 hdr = NULL; 2865 *errp = -EMSGSIZE; 2866 } else { 2867 *errp = 0; 2868 } 2869 } 2870 return hdr; 2871 } 2872 2873 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2874 const struct xfrm_algo_desc *d) 2875 { 2876 unsigned int id = d->desc.sadb_alg_id; 2877 2878 if (id >= sizeof(t->aalgos) * 8) 2879 return 0; 2880 2881 return (t->aalgos >> id) & 1; 2882 } 2883 2884 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2885 const struct xfrm_algo_desc *d) 2886 { 2887 unsigned int id = d->desc.sadb_alg_id; 2888 2889 if (id >= sizeof(t->ealgos) * 8) 2890 return 0; 2891 2892 return (t->ealgos >> id) & 1; 2893 } 2894 2895 static int count_ah_combs(const struct xfrm_tmpl *t) 2896 { 2897 int i, sz = 0; 2898 2899 for (i = 0; ; i++) { 2900 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2901 if (!aalg) 2902 break; 2903 if (!aalg->pfkey_supported) 2904 continue; 2905 if (aalg_tmpl_set(t, aalg) && aalg->available) 2906 sz += sizeof(struct sadb_comb); 2907 } 2908 return sz + sizeof(struct sadb_prop); 2909 } 2910 2911 static int count_esp_combs(const struct xfrm_tmpl *t) 2912 { 2913 int i, k, sz = 0; 2914 2915 for (i = 0; ; i++) { 2916 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2917 if (!ealg) 2918 break; 2919 2920 if (!ealg->pfkey_supported) 2921 continue; 2922 2923 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2924 continue; 2925 2926 for (k = 1; ; k++) { 2927 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2928 if (!aalg) 2929 break; 2930 2931 if (!aalg->pfkey_supported) 2932 continue; 2933 2934 if (aalg_tmpl_set(t, aalg) && aalg->available) 2935 sz += sizeof(struct sadb_comb); 2936 } 2937 } 2938 return sz + sizeof(struct sadb_prop); 2939 } 2940 2941 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2942 { 2943 struct sadb_prop *p; 2944 int i; 2945 2946 p = skb_put(skb, sizeof(struct sadb_prop)); 2947 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2948 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2949 p->sadb_prop_replay = 32; 2950 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2951 2952 for (i = 0; ; i++) { 2953 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2954 if (!aalg) 2955 break; 2956 2957 if (!aalg->pfkey_supported) 2958 continue; 2959 2960 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2961 struct sadb_comb *c; 2962 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2963 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2964 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2965 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2966 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2967 c->sadb_comb_hard_addtime = 24*60*60; 2968 c->sadb_comb_soft_addtime = 20*60*60; 2969 c->sadb_comb_hard_usetime = 8*60*60; 2970 c->sadb_comb_soft_usetime = 7*60*60; 2971 } 2972 } 2973 } 2974 2975 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2976 { 2977 struct sadb_prop *p; 2978 int i, k; 2979 2980 p = skb_put(skb, sizeof(struct sadb_prop)); 2981 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2982 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2983 p->sadb_prop_replay = 32; 2984 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2985 2986 for (i=0; ; i++) { 2987 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2988 if (!ealg) 2989 break; 2990 2991 if (!ealg->pfkey_supported) 2992 continue; 2993 2994 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2995 continue; 2996 2997 for (k = 1; ; k++) { 2998 struct sadb_comb *c; 2999 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3000 if (!aalg) 3001 break; 3002 if (!aalg->pfkey_supported) 3003 continue; 3004 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3005 continue; 3006 c = skb_put(skb, sizeof(struct sadb_comb)); 3007 memset(c, 0, sizeof(*c)); 3008 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3009 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3010 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3011 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3012 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3013 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3014 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3015 c->sadb_comb_hard_addtime = 24*60*60; 3016 c->sadb_comb_soft_addtime = 20*60*60; 3017 c->sadb_comb_hard_usetime = 8*60*60; 3018 c->sadb_comb_soft_usetime = 7*60*60; 3019 } 3020 } 3021 } 3022 3023 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3024 { 3025 return 0; 3026 } 3027 3028 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3029 { 3030 struct sk_buff *out_skb; 3031 struct sadb_msg *out_hdr; 3032 int hard; 3033 int hsc; 3034 3035 hard = c->data.hard; 3036 if (hard) 3037 hsc = 2; 3038 else 3039 hsc = 1; 3040 3041 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3042 if (IS_ERR(out_skb)) 3043 return PTR_ERR(out_skb); 3044 3045 out_hdr = (struct sadb_msg *) out_skb->data; 3046 out_hdr->sadb_msg_version = PF_KEY_V2; 3047 out_hdr->sadb_msg_type = SADB_EXPIRE; 3048 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3049 out_hdr->sadb_msg_errno = 0; 3050 out_hdr->sadb_msg_reserved = 0; 3051 out_hdr->sadb_msg_seq = 0; 3052 out_hdr->sadb_msg_pid = 0; 3053 3054 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3055 xs_net(x)); 3056 return 0; 3057 } 3058 3059 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3060 { 3061 struct net *net = x ? xs_net(x) : c->net; 3062 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3063 3064 if (atomic_read(&net_pfkey->socks_nr) == 0) 3065 return 0; 3066 3067 switch (c->event) { 3068 case XFRM_MSG_EXPIRE: 3069 return key_notify_sa_expire(x, c); 3070 case XFRM_MSG_DELSA: 3071 case XFRM_MSG_NEWSA: 3072 case XFRM_MSG_UPDSA: 3073 return key_notify_sa(x, c); 3074 case XFRM_MSG_FLUSHSA: 3075 return key_notify_sa_flush(c); 3076 case XFRM_MSG_NEWAE: /* not yet supported */ 3077 break; 3078 default: 3079 pr_err("pfkey: Unknown SA event %d\n", c->event); 3080 break; 3081 } 3082 3083 return 0; 3084 } 3085 3086 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3087 { 3088 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3089 return 0; 3090 3091 switch (c->event) { 3092 case XFRM_MSG_POLEXPIRE: 3093 return key_notify_policy_expire(xp, c); 3094 case XFRM_MSG_DELPOLICY: 3095 case XFRM_MSG_NEWPOLICY: 3096 case XFRM_MSG_UPDPOLICY: 3097 return key_notify_policy(xp, dir, c); 3098 case XFRM_MSG_FLUSHPOLICY: 3099 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3100 break; 3101 return key_notify_policy_flush(c); 3102 default: 3103 pr_err("pfkey: Unknown policy event %d\n", c->event); 3104 break; 3105 } 3106 3107 return 0; 3108 } 3109 3110 static u32 get_acqseq(void) 3111 { 3112 u32 res; 3113 static atomic_t acqseq; 3114 3115 do { 3116 res = atomic_inc_return(&acqseq); 3117 } while (!res); 3118 return res; 3119 } 3120 3121 static bool pfkey_is_alive(const struct km_event *c) 3122 { 3123 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3124 struct sock *sk; 3125 bool is_alive = false; 3126 3127 rcu_read_lock(); 3128 sk_for_each_rcu(sk, &net_pfkey->table) { 3129 if (pfkey_sk(sk)->registered) { 3130 is_alive = true; 3131 break; 3132 } 3133 } 3134 rcu_read_unlock(); 3135 3136 return is_alive; 3137 } 3138 3139 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3140 { 3141 struct sk_buff *skb; 3142 struct sadb_msg *hdr; 3143 struct sadb_address *addr; 3144 struct sadb_x_policy *pol; 3145 int sockaddr_size; 3146 int size; 3147 struct sadb_x_sec_ctx *sec_ctx; 3148 struct xfrm_sec_ctx *xfrm_ctx; 3149 int ctx_size = 0; 3150 3151 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3152 if (!sockaddr_size) 3153 return -EINVAL; 3154 3155 size = sizeof(struct sadb_msg) + 3156 (sizeof(struct sadb_address) * 2) + 3157 (sockaddr_size * 2) + 3158 sizeof(struct sadb_x_policy); 3159 3160 if (x->id.proto == IPPROTO_AH) 3161 size += count_ah_combs(t); 3162 else if (x->id.proto == IPPROTO_ESP) 3163 size += count_esp_combs(t); 3164 3165 if ((xfrm_ctx = x->security)) { 3166 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3167 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3168 } 3169 3170 skb = alloc_skb(size + 16, GFP_ATOMIC); 3171 if (skb == NULL) 3172 return -ENOMEM; 3173 3174 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3175 hdr->sadb_msg_version = PF_KEY_V2; 3176 hdr->sadb_msg_type = SADB_ACQUIRE; 3177 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3178 hdr->sadb_msg_len = size / sizeof(uint64_t); 3179 hdr->sadb_msg_errno = 0; 3180 hdr->sadb_msg_reserved = 0; 3181 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3182 hdr->sadb_msg_pid = 0; 3183 3184 /* src address */ 3185 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3186 addr->sadb_address_len = 3187 (sizeof(struct sadb_address)+sockaddr_size)/ 3188 sizeof(uint64_t); 3189 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3190 addr->sadb_address_proto = 0; 3191 addr->sadb_address_reserved = 0; 3192 addr->sadb_address_prefixlen = 3193 pfkey_sockaddr_fill(&x->props.saddr, 0, 3194 (struct sockaddr *) (addr + 1), 3195 x->props.family); 3196 if (!addr->sadb_address_prefixlen) 3197 BUG(); 3198 3199 /* dst address */ 3200 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3201 addr->sadb_address_len = 3202 (sizeof(struct sadb_address)+sockaddr_size)/ 3203 sizeof(uint64_t); 3204 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3205 addr->sadb_address_proto = 0; 3206 addr->sadb_address_reserved = 0; 3207 addr->sadb_address_prefixlen = 3208 pfkey_sockaddr_fill(&x->id.daddr, 0, 3209 (struct sockaddr *) (addr + 1), 3210 x->props.family); 3211 if (!addr->sadb_address_prefixlen) 3212 BUG(); 3213 3214 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3215 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3216 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3217 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3218 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3219 pol->sadb_x_policy_reserved = 0; 3220 pol->sadb_x_policy_id = xp->index; 3221 pol->sadb_x_policy_priority = xp->priority; 3222 3223 /* Set sadb_comb's. */ 3224 if (x->id.proto == IPPROTO_AH) 3225 dump_ah_combs(skb, t); 3226 else if (x->id.proto == IPPROTO_ESP) 3227 dump_esp_combs(skb, t); 3228 3229 /* security context */ 3230 if (xfrm_ctx) { 3231 sec_ctx = skb_put(skb, 3232 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3233 sec_ctx->sadb_x_sec_len = 3234 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3235 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3236 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3237 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3238 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3239 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3240 xfrm_ctx->ctx_len); 3241 } 3242 3243 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3244 xs_net(x)); 3245 } 3246 3247 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3248 u8 *data, int len, int *dir) 3249 { 3250 struct net *net = sock_net(sk); 3251 struct xfrm_policy *xp; 3252 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3253 struct sadb_x_sec_ctx *sec_ctx; 3254 3255 switch (sk->sk_family) { 3256 case AF_INET: 3257 if (opt != IP_IPSEC_POLICY) { 3258 *dir = -EOPNOTSUPP; 3259 return NULL; 3260 } 3261 break; 3262 #if IS_ENABLED(CONFIG_IPV6) 3263 case AF_INET6: 3264 if (opt != IPV6_IPSEC_POLICY) { 3265 *dir = -EOPNOTSUPP; 3266 return NULL; 3267 } 3268 break; 3269 #endif 3270 default: 3271 *dir = -EINVAL; 3272 return NULL; 3273 } 3274 3275 *dir = -EINVAL; 3276 3277 if (len < sizeof(struct sadb_x_policy) || 3278 pol->sadb_x_policy_len*8 > len || 3279 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3280 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3281 return NULL; 3282 3283 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3284 if (xp == NULL) { 3285 *dir = -ENOBUFS; 3286 return NULL; 3287 } 3288 3289 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3290 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3291 3292 xp->lft.soft_byte_limit = XFRM_INF; 3293 xp->lft.hard_byte_limit = XFRM_INF; 3294 xp->lft.soft_packet_limit = XFRM_INF; 3295 xp->lft.hard_packet_limit = XFRM_INF; 3296 xp->family = sk->sk_family; 3297 3298 xp->xfrm_nr = 0; 3299 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3300 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3301 goto out; 3302 3303 /* security context too */ 3304 if (len >= (pol->sadb_x_policy_len*8 + 3305 sizeof(struct sadb_x_sec_ctx))) { 3306 char *p = (char *)pol; 3307 struct xfrm_user_sec_ctx *uctx; 3308 3309 p += pol->sadb_x_policy_len*8; 3310 sec_ctx = (struct sadb_x_sec_ctx *)p; 3311 if (len < pol->sadb_x_policy_len*8 + 3312 sec_ctx->sadb_x_sec_len*8) { 3313 *dir = -EINVAL; 3314 goto out; 3315 } 3316 if ((*dir = verify_sec_ctx_len(p))) 3317 goto out; 3318 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3319 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3320 kfree(uctx); 3321 3322 if (*dir) 3323 goto out; 3324 } 3325 3326 *dir = pol->sadb_x_policy_dir-1; 3327 return xp; 3328 3329 out: 3330 xp->walk.dead = 1; 3331 xfrm_policy_destroy(xp); 3332 return NULL; 3333 } 3334 3335 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3336 { 3337 struct sk_buff *skb; 3338 struct sadb_msg *hdr; 3339 struct sadb_sa *sa; 3340 struct sadb_address *addr; 3341 struct sadb_x_nat_t_port *n_port; 3342 int sockaddr_size; 3343 int size; 3344 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3345 struct xfrm_encap_tmpl *natt = NULL; 3346 3347 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3348 if (!sockaddr_size) 3349 return -EINVAL; 3350 3351 if (!satype) 3352 return -EINVAL; 3353 3354 if (!x->encap) 3355 return -EINVAL; 3356 3357 natt = x->encap; 3358 3359 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3360 * 3361 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3362 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3363 */ 3364 3365 size = sizeof(struct sadb_msg) + 3366 sizeof(struct sadb_sa) + 3367 (sizeof(struct sadb_address) * 2) + 3368 (sockaddr_size * 2) + 3369 (sizeof(struct sadb_x_nat_t_port) * 2); 3370 3371 skb = alloc_skb(size + 16, GFP_ATOMIC); 3372 if (skb == NULL) 3373 return -ENOMEM; 3374 3375 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3376 hdr->sadb_msg_version = PF_KEY_V2; 3377 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3378 hdr->sadb_msg_satype = satype; 3379 hdr->sadb_msg_len = size / sizeof(uint64_t); 3380 hdr->sadb_msg_errno = 0; 3381 hdr->sadb_msg_reserved = 0; 3382 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3383 hdr->sadb_msg_pid = 0; 3384 3385 /* SA */ 3386 sa = skb_put(skb, sizeof(struct sadb_sa)); 3387 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3388 sa->sadb_sa_exttype = SADB_EXT_SA; 3389 sa->sadb_sa_spi = x->id.spi; 3390 sa->sadb_sa_replay = 0; 3391 sa->sadb_sa_state = 0; 3392 sa->sadb_sa_auth = 0; 3393 sa->sadb_sa_encrypt = 0; 3394 sa->sadb_sa_flags = 0; 3395 3396 /* ADDRESS_SRC (old addr) */ 3397 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3398 addr->sadb_address_len = 3399 (sizeof(struct sadb_address)+sockaddr_size)/ 3400 sizeof(uint64_t); 3401 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3402 addr->sadb_address_proto = 0; 3403 addr->sadb_address_reserved = 0; 3404 addr->sadb_address_prefixlen = 3405 pfkey_sockaddr_fill(&x->props.saddr, 0, 3406 (struct sockaddr *) (addr + 1), 3407 x->props.family); 3408 if (!addr->sadb_address_prefixlen) 3409 BUG(); 3410 3411 /* NAT_T_SPORT (old port) */ 3412 n_port = skb_put(skb, sizeof(*n_port)); 3413 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3414 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3415 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3416 n_port->sadb_x_nat_t_port_reserved = 0; 3417 3418 /* ADDRESS_DST (new addr) */ 3419 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3420 addr->sadb_address_len = 3421 (sizeof(struct sadb_address)+sockaddr_size)/ 3422 sizeof(uint64_t); 3423 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3424 addr->sadb_address_proto = 0; 3425 addr->sadb_address_reserved = 0; 3426 addr->sadb_address_prefixlen = 3427 pfkey_sockaddr_fill(ipaddr, 0, 3428 (struct sockaddr *) (addr + 1), 3429 x->props.family); 3430 if (!addr->sadb_address_prefixlen) 3431 BUG(); 3432 3433 /* NAT_T_DPORT (new port) */ 3434 n_port = skb_put(skb, sizeof(*n_port)); 3435 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3436 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3437 n_port->sadb_x_nat_t_port_port = sport; 3438 n_port->sadb_x_nat_t_port_reserved = 0; 3439 3440 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3441 xs_net(x)); 3442 } 3443 3444 #ifdef CONFIG_NET_KEY_MIGRATE 3445 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3446 const struct xfrm_selector *sel) 3447 { 3448 struct sadb_address *addr; 3449 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3450 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3451 addr->sadb_address_exttype = type; 3452 addr->sadb_address_proto = sel->proto; 3453 addr->sadb_address_reserved = 0; 3454 3455 switch (type) { 3456 case SADB_EXT_ADDRESS_SRC: 3457 addr->sadb_address_prefixlen = sel->prefixlen_s; 3458 pfkey_sockaddr_fill(&sel->saddr, 0, 3459 (struct sockaddr *)(addr + 1), 3460 sel->family); 3461 break; 3462 case SADB_EXT_ADDRESS_DST: 3463 addr->sadb_address_prefixlen = sel->prefixlen_d; 3464 pfkey_sockaddr_fill(&sel->daddr, 0, 3465 (struct sockaddr *)(addr + 1), 3466 sel->family); 3467 break; 3468 default: 3469 return -EINVAL; 3470 } 3471 3472 return 0; 3473 } 3474 3475 3476 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3477 { 3478 struct sadb_x_kmaddress *kma; 3479 u8 *sa; 3480 int family = k->family; 3481 int socklen = pfkey_sockaddr_len(family); 3482 int size_req; 3483 3484 size_req = (sizeof(struct sadb_x_kmaddress) + 3485 pfkey_sockaddr_pair_size(family)); 3486 3487 kma = skb_put_zero(skb, size_req); 3488 kma->sadb_x_kmaddress_len = size_req / 8; 3489 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3490 kma->sadb_x_kmaddress_reserved = k->reserved; 3491 3492 sa = (u8 *)(kma + 1); 3493 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3494 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3495 return -EINVAL; 3496 3497 return 0; 3498 } 3499 3500 static int set_ipsecrequest(struct sk_buff *skb, 3501 uint8_t proto, uint8_t mode, int level, 3502 uint32_t reqid, uint8_t family, 3503 const xfrm_address_t *src, const xfrm_address_t *dst) 3504 { 3505 struct sadb_x_ipsecrequest *rq; 3506 u8 *sa; 3507 int socklen = pfkey_sockaddr_len(family); 3508 int size_req; 3509 3510 size_req = sizeof(struct sadb_x_ipsecrequest) + 3511 pfkey_sockaddr_pair_size(family); 3512 3513 rq = skb_put_zero(skb, size_req); 3514 rq->sadb_x_ipsecrequest_len = size_req; 3515 rq->sadb_x_ipsecrequest_proto = proto; 3516 rq->sadb_x_ipsecrequest_mode = mode; 3517 rq->sadb_x_ipsecrequest_level = level; 3518 rq->sadb_x_ipsecrequest_reqid = reqid; 3519 3520 sa = (u8 *) (rq + 1); 3521 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3522 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3523 return -EINVAL; 3524 3525 return 0; 3526 } 3527 #endif 3528 3529 #ifdef CONFIG_NET_KEY_MIGRATE 3530 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3531 const struct xfrm_migrate *m, int num_bundles, 3532 const struct xfrm_kmaddress *k, 3533 const struct xfrm_encap_tmpl *encap) 3534 { 3535 int i; 3536 int sasize_sel; 3537 int size = 0; 3538 int size_pol = 0; 3539 struct sk_buff *skb; 3540 struct sadb_msg *hdr; 3541 struct sadb_x_policy *pol; 3542 const struct xfrm_migrate *mp; 3543 3544 if (type != XFRM_POLICY_TYPE_MAIN) 3545 return 0; 3546 3547 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3548 return -EINVAL; 3549 3550 if (k != NULL) { 3551 /* addresses for KM */ 3552 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3553 pfkey_sockaddr_pair_size(k->family)); 3554 } 3555 3556 /* selector */ 3557 sasize_sel = pfkey_sockaddr_size(sel->family); 3558 if (!sasize_sel) 3559 return -EINVAL; 3560 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3561 3562 /* policy info */ 3563 size_pol += sizeof(struct sadb_x_policy); 3564 3565 /* ipsecrequests */ 3566 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3567 /* old locator pair */ 3568 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3569 pfkey_sockaddr_pair_size(mp->old_family); 3570 /* new locator pair */ 3571 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3572 pfkey_sockaddr_pair_size(mp->new_family); 3573 } 3574 3575 size += sizeof(struct sadb_msg) + size_pol; 3576 3577 /* alloc buffer */ 3578 skb = alloc_skb(size, GFP_ATOMIC); 3579 if (skb == NULL) 3580 return -ENOMEM; 3581 3582 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3583 hdr->sadb_msg_version = PF_KEY_V2; 3584 hdr->sadb_msg_type = SADB_X_MIGRATE; 3585 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3586 hdr->sadb_msg_len = size / 8; 3587 hdr->sadb_msg_errno = 0; 3588 hdr->sadb_msg_reserved = 0; 3589 hdr->sadb_msg_seq = 0; 3590 hdr->sadb_msg_pid = 0; 3591 3592 /* Addresses to be used by KM for negotiation, if ext is available */ 3593 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3594 goto err; 3595 3596 /* selector src */ 3597 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3598 3599 /* selector dst */ 3600 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3601 3602 /* policy information */ 3603 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3604 pol->sadb_x_policy_len = size_pol / 8; 3605 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3606 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3607 pol->sadb_x_policy_dir = dir + 1; 3608 pol->sadb_x_policy_reserved = 0; 3609 pol->sadb_x_policy_id = 0; 3610 pol->sadb_x_policy_priority = 0; 3611 3612 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3613 /* old ipsecrequest */ 3614 int mode = pfkey_mode_from_xfrm(mp->mode); 3615 if (mode < 0) 3616 goto err; 3617 if (set_ipsecrequest(skb, mp->proto, mode, 3618 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3619 mp->reqid, mp->old_family, 3620 &mp->old_saddr, &mp->old_daddr) < 0) 3621 goto err; 3622 3623 /* new ipsecrequest */ 3624 if (set_ipsecrequest(skb, mp->proto, mode, 3625 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3626 mp->reqid, mp->new_family, 3627 &mp->new_saddr, &mp->new_daddr) < 0) 3628 goto err; 3629 } 3630 3631 /* broadcast migrate message to sockets */ 3632 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3633 3634 return 0; 3635 3636 err: 3637 kfree_skb(skb); 3638 return -EINVAL; 3639 } 3640 #else 3641 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3642 const struct xfrm_migrate *m, int num_bundles, 3643 const struct xfrm_kmaddress *k, 3644 const struct xfrm_encap_tmpl *encap) 3645 { 3646 return -ENOPROTOOPT; 3647 } 3648 #endif 3649 3650 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3651 { 3652 struct sock *sk = sock->sk; 3653 struct sk_buff *skb = NULL; 3654 struct sadb_msg *hdr = NULL; 3655 int err; 3656 struct net *net = sock_net(sk); 3657 3658 err = -EOPNOTSUPP; 3659 if (msg->msg_flags & MSG_OOB) 3660 goto out; 3661 3662 err = -EMSGSIZE; 3663 if ((unsigned int)len > sk->sk_sndbuf - 32) 3664 goto out; 3665 3666 err = -ENOBUFS; 3667 skb = alloc_skb(len, GFP_KERNEL); 3668 if (skb == NULL) 3669 goto out; 3670 3671 err = -EFAULT; 3672 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3673 goto out; 3674 3675 hdr = pfkey_get_base_msg(skb, &err); 3676 if (!hdr) 3677 goto out; 3678 3679 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3680 err = pfkey_process(sk, skb, hdr); 3681 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3682 3683 out: 3684 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3685 err = 0; 3686 kfree_skb(skb); 3687 3688 return err ? : len; 3689 } 3690 3691 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3692 int flags) 3693 { 3694 struct sock *sk = sock->sk; 3695 struct pfkey_sock *pfk = pfkey_sk(sk); 3696 struct sk_buff *skb; 3697 int copied, err; 3698 3699 err = -EINVAL; 3700 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3701 goto out; 3702 3703 skb = skb_recv_datagram(sk, flags, &err); 3704 if (skb == NULL) 3705 goto out; 3706 3707 copied = skb->len; 3708 if (copied > len) { 3709 msg->msg_flags |= MSG_TRUNC; 3710 copied = len; 3711 } 3712 3713 skb_reset_transport_header(skb); 3714 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3715 if (err) 3716 goto out_free; 3717 3718 sock_recv_cmsgs(msg, sk, skb); 3719 3720 err = (flags & MSG_TRUNC) ? skb->len : copied; 3721 3722 if (pfk->dump.dump != NULL && 3723 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3724 pfkey_do_dump(pfk); 3725 3726 out_free: 3727 skb_free_datagram(sk, skb); 3728 out: 3729 return err; 3730 } 3731 3732 static const struct proto_ops pfkey_ops = { 3733 .family = PF_KEY, 3734 .owner = THIS_MODULE, 3735 /* Operations that make no sense on pfkey sockets. */ 3736 .bind = sock_no_bind, 3737 .connect = sock_no_connect, 3738 .socketpair = sock_no_socketpair, 3739 .accept = sock_no_accept, 3740 .getname = sock_no_getname, 3741 .ioctl = sock_no_ioctl, 3742 .listen = sock_no_listen, 3743 .shutdown = sock_no_shutdown, 3744 .mmap = sock_no_mmap, 3745 .sendpage = sock_no_sendpage, 3746 3747 /* Now the operations that really occur. */ 3748 .release = pfkey_release, 3749 .poll = datagram_poll, 3750 .sendmsg = pfkey_sendmsg, 3751 .recvmsg = pfkey_recvmsg, 3752 }; 3753 3754 static const struct net_proto_family pfkey_family_ops = { 3755 .family = PF_KEY, 3756 .create = pfkey_create, 3757 .owner = THIS_MODULE, 3758 }; 3759 3760 #ifdef CONFIG_PROC_FS 3761 static int pfkey_seq_show(struct seq_file *f, void *v) 3762 { 3763 struct sock *s = sk_entry(v); 3764 3765 if (v == SEQ_START_TOKEN) 3766 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3767 else 3768 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3769 s, 3770 refcount_read(&s->sk_refcnt), 3771 sk_rmem_alloc_get(s), 3772 sk_wmem_alloc_get(s), 3773 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3774 sock_i_ino(s) 3775 ); 3776 return 0; 3777 } 3778 3779 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3780 __acquires(rcu) 3781 { 3782 struct net *net = seq_file_net(f); 3783 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3784 3785 rcu_read_lock(); 3786 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3787 } 3788 3789 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3790 { 3791 struct net *net = seq_file_net(f); 3792 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3793 3794 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3795 } 3796 3797 static void pfkey_seq_stop(struct seq_file *f, void *v) 3798 __releases(rcu) 3799 { 3800 rcu_read_unlock(); 3801 } 3802 3803 static const struct seq_operations pfkey_seq_ops = { 3804 .start = pfkey_seq_start, 3805 .next = pfkey_seq_next, 3806 .stop = pfkey_seq_stop, 3807 .show = pfkey_seq_show, 3808 }; 3809 3810 static int __net_init pfkey_init_proc(struct net *net) 3811 { 3812 struct proc_dir_entry *e; 3813 3814 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3815 sizeof(struct seq_net_private)); 3816 if (e == NULL) 3817 return -ENOMEM; 3818 3819 return 0; 3820 } 3821 3822 static void __net_exit pfkey_exit_proc(struct net *net) 3823 { 3824 remove_proc_entry("pfkey", net->proc_net); 3825 } 3826 #else 3827 static inline int pfkey_init_proc(struct net *net) 3828 { 3829 return 0; 3830 } 3831 3832 static inline void pfkey_exit_proc(struct net *net) 3833 { 3834 } 3835 #endif 3836 3837 static struct xfrm_mgr pfkeyv2_mgr = 3838 { 3839 .notify = pfkey_send_notify, 3840 .acquire = pfkey_send_acquire, 3841 .compile_policy = pfkey_compile_policy, 3842 .new_mapping = pfkey_send_new_mapping, 3843 .notify_policy = pfkey_send_policy_notify, 3844 .migrate = pfkey_send_migrate, 3845 .is_alive = pfkey_is_alive, 3846 }; 3847 3848 static int __net_init pfkey_net_init(struct net *net) 3849 { 3850 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3851 int rv; 3852 3853 INIT_HLIST_HEAD(&net_pfkey->table); 3854 atomic_set(&net_pfkey->socks_nr, 0); 3855 3856 rv = pfkey_init_proc(net); 3857 3858 return rv; 3859 } 3860 3861 static void __net_exit pfkey_net_exit(struct net *net) 3862 { 3863 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3864 3865 pfkey_exit_proc(net); 3866 WARN_ON(!hlist_empty(&net_pfkey->table)); 3867 } 3868 3869 static struct pernet_operations pfkey_net_ops = { 3870 .init = pfkey_net_init, 3871 .exit = pfkey_net_exit, 3872 .id = &pfkey_net_id, 3873 .size = sizeof(struct netns_pfkey), 3874 }; 3875 3876 static void __exit ipsec_pfkey_exit(void) 3877 { 3878 xfrm_unregister_km(&pfkeyv2_mgr); 3879 sock_unregister(PF_KEY); 3880 unregister_pernet_subsys(&pfkey_net_ops); 3881 proto_unregister(&key_proto); 3882 } 3883 3884 static int __init ipsec_pfkey_init(void) 3885 { 3886 int err = proto_register(&key_proto, 0); 3887 3888 if (err != 0) 3889 goto out; 3890 3891 err = register_pernet_subsys(&pfkey_net_ops); 3892 if (err != 0) 3893 goto out_unregister_key_proto; 3894 err = sock_register(&pfkey_family_ops); 3895 if (err != 0) 3896 goto out_unregister_pernet; 3897 err = xfrm_register_km(&pfkeyv2_mgr); 3898 if (err != 0) 3899 goto out_sock_unregister; 3900 out: 3901 return err; 3902 3903 out_sock_unregister: 3904 sock_unregister(PF_KEY); 3905 out_unregister_pernet: 3906 unregister_pernet_subsys(&pfkey_net_ops); 3907 out_unregister_key_proto: 3908 proto_unregister(&key_proto); 3909 goto out; 3910 } 3911 3912 module_init(ipsec_pfkey_init); 3913 module_exit(ipsec_pfkey_exit); 3914 MODULE_LICENSE("GPL"); 3915 MODULE_ALIAS_NETPROTO(PF_KEY); 3916