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 mutex_lock(&pfkey_mutex); 1701 xfrm_probe_algs(); 1702 1703 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); 1704 mutex_unlock(&pfkey_mutex); 1705 1706 if (!supp_skb) { 1707 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1708 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1709 1710 return -ENOBUFS; 1711 } 1712 1713 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1714 sock_net(sk)); 1715 return 0; 1716 } 1717 1718 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1719 { 1720 struct sk_buff *skb; 1721 struct sadb_msg *hdr; 1722 1723 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1724 if (!skb) 1725 return -ENOBUFS; 1726 1727 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1728 hdr->sadb_msg_errno = (uint8_t) 0; 1729 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1730 1731 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1732 sock_net(sk)); 1733 } 1734 1735 static int key_notify_sa_flush(const struct km_event *c) 1736 { 1737 struct sk_buff *skb; 1738 struct sadb_msg *hdr; 1739 1740 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1741 if (!skb) 1742 return -ENOBUFS; 1743 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1744 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1745 hdr->sadb_msg_type = SADB_FLUSH; 1746 hdr->sadb_msg_seq = c->seq; 1747 hdr->sadb_msg_pid = c->portid; 1748 hdr->sadb_msg_version = PF_KEY_V2; 1749 hdr->sadb_msg_errno = (uint8_t) 0; 1750 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1751 hdr->sadb_msg_reserved = 0; 1752 1753 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1754 1755 return 0; 1756 } 1757 1758 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1759 { 1760 struct net *net = sock_net(sk); 1761 unsigned int proto; 1762 struct km_event c; 1763 int err, err2; 1764 1765 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1766 if (proto == 0) 1767 return -EINVAL; 1768 1769 err = xfrm_state_flush(net, proto, true, false); 1770 err2 = unicast_flush_resp(sk, hdr); 1771 if (err || err2) { 1772 if (err == -ESRCH) /* empty table - go quietly */ 1773 err = 0; 1774 return err ? err : err2; 1775 } 1776 1777 c.data.proto = proto; 1778 c.seq = hdr->sadb_msg_seq; 1779 c.portid = hdr->sadb_msg_pid; 1780 c.event = XFRM_MSG_FLUSHSA; 1781 c.net = net; 1782 km_state_notify(NULL, &c); 1783 1784 return 0; 1785 } 1786 1787 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1788 { 1789 struct pfkey_sock *pfk = ptr; 1790 struct sk_buff *out_skb; 1791 struct sadb_msg *out_hdr; 1792 1793 if (!pfkey_can_dump(&pfk->sk)) 1794 return -ENOBUFS; 1795 1796 out_skb = pfkey_xfrm_state2msg(x); 1797 if (IS_ERR(out_skb)) 1798 return PTR_ERR(out_skb); 1799 1800 out_hdr = (struct sadb_msg *) out_skb->data; 1801 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1802 out_hdr->sadb_msg_type = SADB_DUMP; 1803 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1804 out_hdr->sadb_msg_errno = 0; 1805 out_hdr->sadb_msg_reserved = 0; 1806 out_hdr->sadb_msg_seq = count + 1; 1807 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1808 1809 if (pfk->dump.skb) 1810 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1811 &pfk->sk, sock_net(&pfk->sk)); 1812 pfk->dump.skb = out_skb; 1813 1814 return 0; 1815 } 1816 1817 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1818 { 1819 struct net *net = sock_net(&pfk->sk); 1820 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1821 } 1822 1823 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1824 { 1825 struct net *net = sock_net(&pfk->sk); 1826 1827 xfrm_state_walk_done(&pfk->dump.u.state, net); 1828 } 1829 1830 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1831 { 1832 u8 proto; 1833 struct xfrm_address_filter *filter = NULL; 1834 struct pfkey_sock *pfk = pfkey_sk(sk); 1835 1836 mutex_lock(&pfk->dump_lock); 1837 if (pfk->dump.dump != NULL) { 1838 mutex_unlock(&pfk->dump_lock); 1839 return -EBUSY; 1840 } 1841 1842 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1843 if (proto == 0) { 1844 mutex_unlock(&pfk->dump_lock); 1845 return -EINVAL; 1846 } 1847 1848 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1849 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1850 1851 if ((xfilter->sadb_x_filter_splen >= 1852 (sizeof(xfrm_address_t) << 3)) || 1853 (xfilter->sadb_x_filter_dplen >= 1854 (sizeof(xfrm_address_t) << 3))) { 1855 mutex_unlock(&pfk->dump_lock); 1856 return -EINVAL; 1857 } 1858 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1859 if (filter == NULL) { 1860 mutex_unlock(&pfk->dump_lock); 1861 return -ENOMEM; 1862 } 1863 1864 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1865 sizeof(xfrm_address_t)); 1866 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1867 sizeof(xfrm_address_t)); 1868 filter->family = xfilter->sadb_x_filter_family; 1869 filter->splen = xfilter->sadb_x_filter_splen; 1870 filter->dplen = xfilter->sadb_x_filter_dplen; 1871 } 1872 1873 pfk->dump.msg_version = hdr->sadb_msg_version; 1874 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1875 pfk->dump.dump = pfkey_dump_sa; 1876 pfk->dump.done = pfkey_dump_sa_done; 1877 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1878 mutex_unlock(&pfk->dump_lock); 1879 1880 return pfkey_do_dump(pfk); 1881 } 1882 1883 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1884 { 1885 struct pfkey_sock *pfk = pfkey_sk(sk); 1886 int satype = hdr->sadb_msg_satype; 1887 bool reset_errno = false; 1888 1889 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1890 reset_errno = true; 1891 if (satype != 0 && satype != 1) 1892 return -EINVAL; 1893 pfk->promisc = satype; 1894 } 1895 if (reset_errno && skb_cloned(skb)) 1896 skb = skb_copy(skb, GFP_KERNEL); 1897 else 1898 skb = skb_clone(skb, GFP_KERNEL); 1899 1900 if (reset_errno && skb) { 1901 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1902 new_hdr->sadb_msg_errno = 0; 1903 } 1904 1905 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1906 return 0; 1907 } 1908 1909 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1910 { 1911 int i; 1912 u32 reqid = *(u32*)ptr; 1913 1914 for (i=0; i<xp->xfrm_nr; i++) { 1915 if (xp->xfrm_vec[i].reqid == reqid) 1916 return -EEXIST; 1917 } 1918 return 0; 1919 } 1920 1921 static u32 gen_reqid(struct net *net) 1922 { 1923 struct xfrm_policy_walk walk; 1924 u32 start; 1925 int rc; 1926 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1927 1928 start = reqid; 1929 do { 1930 ++reqid; 1931 if (reqid == 0) 1932 reqid = IPSEC_MANUAL_REQID_MAX+1; 1933 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1934 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1935 xfrm_policy_walk_done(&walk, net); 1936 if (rc != -EEXIST) 1937 return reqid; 1938 } while (reqid != start); 1939 return 0; 1940 } 1941 1942 static int 1943 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1944 { 1945 struct net *net = xp_net(xp); 1946 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1947 int mode; 1948 1949 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1950 return -ELOOP; 1951 1952 if (rq->sadb_x_ipsecrequest_mode == 0) 1953 return -EINVAL; 1954 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1955 return -EINVAL; 1956 1957 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1958 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1959 return -EINVAL; 1960 t->mode = mode; 1961 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1962 t->optional = 1; 1963 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1964 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1965 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1966 t->reqid = 0; 1967 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1968 return -ENOBUFS; 1969 } 1970 1971 /* addresses present only in tunnel mode */ 1972 if (t->mode == XFRM_MODE_TUNNEL) { 1973 int err; 1974 1975 err = parse_sockaddr_pair( 1976 (struct sockaddr *)(rq + 1), 1977 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1978 &t->saddr, &t->id.daddr, &t->encap_family); 1979 if (err) 1980 return err; 1981 } else 1982 t->encap_family = xp->family; 1983 1984 /* No way to set this via kame pfkey */ 1985 t->allalgs = 1; 1986 xp->xfrm_nr++; 1987 return 0; 1988 } 1989 1990 static int 1991 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1992 { 1993 int err; 1994 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1995 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1996 1997 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1998 return -EINVAL; 1999 2000 while (len >= sizeof(*rq)) { 2001 if (len < rq->sadb_x_ipsecrequest_len || 2002 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2003 return -EINVAL; 2004 2005 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2006 return err; 2007 len -= rq->sadb_x_ipsecrequest_len; 2008 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2009 } 2010 return 0; 2011 } 2012 2013 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2014 { 2015 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2016 2017 if (xfrm_ctx) { 2018 int len = sizeof(struct sadb_x_sec_ctx); 2019 len += xfrm_ctx->ctx_len; 2020 return PFKEY_ALIGN8(len); 2021 } 2022 return 0; 2023 } 2024 2025 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2026 { 2027 const struct xfrm_tmpl *t; 2028 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2029 int socklen = 0; 2030 int i; 2031 2032 for (i=0; i<xp->xfrm_nr; i++) { 2033 t = xp->xfrm_vec + i; 2034 socklen += pfkey_sockaddr_len(t->encap_family); 2035 } 2036 2037 return sizeof(struct sadb_msg) + 2038 (sizeof(struct sadb_lifetime) * 3) + 2039 (sizeof(struct sadb_address) * 2) + 2040 (sockaddr_size * 2) + 2041 sizeof(struct sadb_x_policy) + 2042 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2043 (socklen * 2) + 2044 pfkey_xfrm_policy2sec_ctx_size(xp); 2045 } 2046 2047 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2048 { 2049 struct sk_buff *skb; 2050 int size; 2051 2052 size = pfkey_xfrm_policy2msg_size(xp); 2053 2054 skb = alloc_skb(size + 16, GFP_ATOMIC); 2055 if (skb == NULL) 2056 return ERR_PTR(-ENOBUFS); 2057 2058 return skb; 2059 } 2060 2061 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2062 { 2063 struct sadb_msg *hdr; 2064 struct sadb_address *addr; 2065 struct sadb_lifetime *lifetime; 2066 struct sadb_x_policy *pol; 2067 struct sadb_x_sec_ctx *sec_ctx; 2068 struct xfrm_sec_ctx *xfrm_ctx; 2069 int i; 2070 int size; 2071 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2072 int socklen = pfkey_sockaddr_len(xp->family); 2073 2074 size = pfkey_xfrm_policy2msg_size(xp); 2075 2076 /* call should fill header later */ 2077 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2078 memset(hdr, 0, size); /* XXX do we need this ? */ 2079 2080 /* src address */ 2081 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2082 addr->sadb_address_len = 2083 (sizeof(struct sadb_address)+sockaddr_size)/ 2084 sizeof(uint64_t); 2085 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2086 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2087 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2088 addr->sadb_address_reserved = 0; 2089 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2090 xp->selector.sport, 2091 (struct sockaddr *) (addr + 1), 2092 xp->family)) 2093 BUG(); 2094 2095 /* dst address */ 2096 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2097 addr->sadb_address_len = 2098 (sizeof(struct sadb_address)+sockaddr_size)/ 2099 sizeof(uint64_t); 2100 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2101 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2102 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2103 addr->sadb_address_reserved = 0; 2104 2105 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2106 (struct sockaddr *) (addr + 1), 2107 xp->family); 2108 2109 /* hard time */ 2110 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2111 lifetime->sadb_lifetime_len = 2112 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2113 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2114 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2115 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2116 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2117 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2118 /* soft time */ 2119 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2120 lifetime->sadb_lifetime_len = 2121 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2122 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2123 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2124 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2125 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2126 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2127 /* current time */ 2128 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2129 lifetime->sadb_lifetime_len = 2130 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2131 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2132 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2133 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2134 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2135 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2136 2137 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2138 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2139 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2140 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2141 if (xp->action == XFRM_POLICY_ALLOW) { 2142 if (xp->xfrm_nr) 2143 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2144 else 2145 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2146 } 2147 pol->sadb_x_policy_dir = dir+1; 2148 pol->sadb_x_policy_reserved = 0; 2149 pol->sadb_x_policy_id = xp->index; 2150 pol->sadb_x_policy_priority = xp->priority; 2151 2152 for (i=0; i<xp->xfrm_nr; i++) { 2153 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2154 struct sadb_x_ipsecrequest *rq; 2155 int req_size; 2156 int mode; 2157 2158 req_size = sizeof(struct sadb_x_ipsecrequest); 2159 if (t->mode == XFRM_MODE_TUNNEL) { 2160 socklen = pfkey_sockaddr_len(t->encap_family); 2161 req_size += socklen * 2; 2162 } else { 2163 size -= 2*socklen; 2164 } 2165 rq = skb_put(skb, req_size); 2166 pol->sadb_x_policy_len += req_size/8; 2167 memset(rq, 0, sizeof(*rq)); 2168 rq->sadb_x_ipsecrequest_len = req_size; 2169 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2170 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2171 return -EINVAL; 2172 rq->sadb_x_ipsecrequest_mode = mode; 2173 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2174 if (t->reqid) 2175 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2176 if (t->optional) 2177 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2178 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2179 2180 if (t->mode == XFRM_MODE_TUNNEL) { 2181 u8 *sa = (void *)(rq + 1); 2182 pfkey_sockaddr_fill(&t->saddr, 0, 2183 (struct sockaddr *)sa, 2184 t->encap_family); 2185 pfkey_sockaddr_fill(&t->id.daddr, 0, 2186 (struct sockaddr *) (sa + socklen), 2187 t->encap_family); 2188 } 2189 } 2190 2191 /* security context */ 2192 if ((xfrm_ctx = xp->security)) { 2193 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2194 2195 sec_ctx = skb_put(skb, ctx_size); 2196 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2197 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2198 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2199 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2200 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2201 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2202 xfrm_ctx->ctx_len); 2203 } 2204 2205 hdr->sadb_msg_len = size / sizeof(uint64_t); 2206 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2207 2208 return 0; 2209 } 2210 2211 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2212 { 2213 struct sk_buff *out_skb; 2214 struct sadb_msg *out_hdr; 2215 int err; 2216 2217 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2218 if (IS_ERR(out_skb)) 2219 return PTR_ERR(out_skb); 2220 2221 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2222 if (err < 0) { 2223 kfree_skb(out_skb); 2224 return err; 2225 } 2226 2227 out_hdr = (struct sadb_msg *) out_skb->data; 2228 out_hdr->sadb_msg_version = PF_KEY_V2; 2229 2230 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2231 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2232 else 2233 out_hdr->sadb_msg_type = event2poltype(c->event); 2234 out_hdr->sadb_msg_errno = 0; 2235 out_hdr->sadb_msg_seq = c->seq; 2236 out_hdr->sadb_msg_pid = c->portid; 2237 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2238 return 0; 2239 2240 } 2241 2242 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2243 { 2244 struct net *net = sock_net(sk); 2245 int err = 0; 2246 struct sadb_lifetime *lifetime; 2247 struct sadb_address *sa; 2248 struct sadb_x_policy *pol; 2249 struct xfrm_policy *xp; 2250 struct km_event c; 2251 struct sadb_x_sec_ctx *sec_ctx; 2252 2253 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2254 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2255 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2256 return -EINVAL; 2257 2258 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2259 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2260 return -EINVAL; 2261 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2262 return -EINVAL; 2263 2264 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2265 if (xp == NULL) 2266 return -ENOBUFS; 2267 2268 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2269 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2270 xp->priority = pol->sadb_x_policy_priority; 2271 2272 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2273 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2274 xp->selector.family = xp->family; 2275 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2276 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2277 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2278 if (xp->selector.sport) 2279 xp->selector.sport_mask = htons(0xffff); 2280 2281 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2282 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2283 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2284 2285 /* Amusing, we set this twice. KAME apps appear to set same value 2286 * in both addresses. 2287 */ 2288 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2289 2290 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2291 if (xp->selector.dport) 2292 xp->selector.dport_mask = htons(0xffff); 2293 2294 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2295 if (sec_ctx != NULL) { 2296 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2297 2298 if (!uctx) { 2299 err = -ENOBUFS; 2300 goto out; 2301 } 2302 2303 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2304 kfree(uctx); 2305 2306 if (err) 2307 goto out; 2308 } 2309 2310 xp->lft.soft_byte_limit = XFRM_INF; 2311 xp->lft.hard_byte_limit = XFRM_INF; 2312 xp->lft.soft_packet_limit = XFRM_INF; 2313 xp->lft.hard_packet_limit = XFRM_INF; 2314 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2315 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2316 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2317 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2318 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2319 } 2320 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2321 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2322 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2323 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2324 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2325 } 2326 xp->xfrm_nr = 0; 2327 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2328 (err = parse_ipsecrequests(xp, pol)) < 0) 2329 goto out; 2330 2331 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2332 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2333 2334 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2335 2336 if (err) 2337 goto out; 2338 2339 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2340 c.event = XFRM_MSG_UPDPOLICY; 2341 else 2342 c.event = XFRM_MSG_NEWPOLICY; 2343 2344 c.seq = hdr->sadb_msg_seq; 2345 c.portid = hdr->sadb_msg_pid; 2346 2347 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2348 xfrm_pol_put(xp); 2349 return 0; 2350 2351 out: 2352 xp->walk.dead = 1; 2353 xfrm_policy_destroy(xp); 2354 return err; 2355 } 2356 2357 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2358 { 2359 struct net *net = sock_net(sk); 2360 int err; 2361 struct sadb_address *sa; 2362 struct sadb_x_policy *pol; 2363 struct xfrm_policy *xp; 2364 struct xfrm_selector sel; 2365 struct km_event c; 2366 struct sadb_x_sec_ctx *sec_ctx; 2367 struct xfrm_sec_ctx *pol_ctx = NULL; 2368 2369 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2370 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2371 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2372 return -EINVAL; 2373 2374 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2375 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2376 return -EINVAL; 2377 2378 memset(&sel, 0, sizeof(sel)); 2379 2380 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2381 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2382 sel.prefixlen_s = sa->sadb_address_prefixlen; 2383 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2384 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2385 if (sel.sport) 2386 sel.sport_mask = htons(0xffff); 2387 2388 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2389 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2390 sel.prefixlen_d = sa->sadb_address_prefixlen; 2391 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2392 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2393 if (sel.dport) 2394 sel.dport_mask = htons(0xffff); 2395 2396 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2397 if (sec_ctx != NULL) { 2398 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2399 2400 if (!uctx) 2401 return -ENOMEM; 2402 2403 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2404 kfree(uctx); 2405 if (err) 2406 return err; 2407 } 2408 2409 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2410 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2411 1, &err); 2412 security_xfrm_policy_free(pol_ctx); 2413 if (xp == NULL) 2414 return -ENOENT; 2415 2416 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2417 2418 if (err) 2419 goto out; 2420 2421 c.seq = hdr->sadb_msg_seq; 2422 c.portid = hdr->sadb_msg_pid; 2423 c.data.byid = 0; 2424 c.event = XFRM_MSG_DELPOLICY; 2425 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2426 2427 out: 2428 xfrm_pol_put(xp); 2429 return err; 2430 } 2431 2432 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2433 { 2434 int err; 2435 struct sk_buff *out_skb; 2436 struct sadb_msg *out_hdr; 2437 err = 0; 2438 2439 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2440 if (IS_ERR(out_skb)) { 2441 err = PTR_ERR(out_skb); 2442 goto out; 2443 } 2444 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2445 if (err < 0) { 2446 kfree_skb(out_skb); 2447 goto out; 2448 } 2449 2450 out_hdr = (struct sadb_msg *) out_skb->data; 2451 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2452 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2453 out_hdr->sadb_msg_satype = 0; 2454 out_hdr->sadb_msg_errno = 0; 2455 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2456 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2457 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2458 err = 0; 2459 2460 out: 2461 return err; 2462 } 2463 2464 static int pfkey_sockaddr_pair_size(sa_family_t family) 2465 { 2466 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2467 } 2468 2469 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2470 xfrm_address_t *saddr, xfrm_address_t *daddr, 2471 u16 *family) 2472 { 2473 int af, socklen; 2474 2475 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2476 return -EINVAL; 2477 2478 af = pfkey_sockaddr_extract(sa, saddr); 2479 if (!af) 2480 return -EINVAL; 2481 2482 socklen = pfkey_sockaddr_len(af); 2483 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2484 daddr) != af) 2485 return -EINVAL; 2486 2487 *family = af; 2488 return 0; 2489 } 2490 2491 #ifdef CONFIG_NET_KEY_MIGRATE 2492 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2493 struct xfrm_migrate *m) 2494 { 2495 int err; 2496 struct sadb_x_ipsecrequest *rq2; 2497 int mode; 2498 2499 if (len < sizeof(*rq1) || 2500 len < rq1->sadb_x_ipsecrequest_len || 2501 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2502 return -EINVAL; 2503 2504 /* old endoints */ 2505 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2506 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2507 &m->old_saddr, &m->old_daddr, 2508 &m->old_family); 2509 if (err) 2510 return err; 2511 2512 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2513 len -= rq1->sadb_x_ipsecrequest_len; 2514 2515 if (len <= sizeof(*rq2) || 2516 len < rq2->sadb_x_ipsecrequest_len || 2517 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2518 return -EINVAL; 2519 2520 /* new endpoints */ 2521 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2522 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2523 &m->new_saddr, &m->new_daddr, 2524 &m->new_family); 2525 if (err) 2526 return err; 2527 2528 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2529 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2530 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2531 return -EINVAL; 2532 2533 m->proto = rq1->sadb_x_ipsecrequest_proto; 2534 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2535 return -EINVAL; 2536 m->mode = mode; 2537 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2538 2539 return ((int)(rq1->sadb_x_ipsecrequest_len + 2540 rq2->sadb_x_ipsecrequest_len)); 2541 } 2542 2543 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2544 const struct sadb_msg *hdr, void * const *ext_hdrs) 2545 { 2546 int i, len, ret, err = -EINVAL; 2547 u8 dir; 2548 struct sadb_address *sa; 2549 struct sadb_x_kmaddress *kma; 2550 struct sadb_x_policy *pol; 2551 struct sadb_x_ipsecrequest *rq; 2552 struct xfrm_selector sel; 2553 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2554 struct xfrm_kmaddress k; 2555 struct net *net = sock_net(sk); 2556 2557 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2558 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2559 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2560 err = -EINVAL; 2561 goto out; 2562 } 2563 2564 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2565 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2566 2567 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2568 err = -EINVAL; 2569 goto out; 2570 } 2571 2572 if (kma) { 2573 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2574 k.reserved = kma->sadb_x_kmaddress_reserved; 2575 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2576 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2577 &k.local, &k.remote, &k.family); 2578 if (ret < 0) { 2579 err = ret; 2580 goto out; 2581 } 2582 } 2583 2584 dir = pol->sadb_x_policy_dir - 1; 2585 memset(&sel, 0, sizeof(sel)); 2586 2587 /* set source address info of selector */ 2588 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2589 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2590 sel.prefixlen_s = sa->sadb_address_prefixlen; 2591 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2592 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2593 if (sel.sport) 2594 sel.sport_mask = htons(0xffff); 2595 2596 /* set destination address info of selector */ 2597 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2598 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2599 sel.prefixlen_d = sa->sadb_address_prefixlen; 2600 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2601 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2602 if (sel.dport) 2603 sel.dport_mask = htons(0xffff); 2604 2605 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2606 2607 /* extract ipsecrequests */ 2608 i = 0; 2609 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2610 2611 while (len > 0 && i < XFRM_MAX_DEPTH) { 2612 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2613 if (ret < 0) { 2614 err = ret; 2615 goto out; 2616 } else { 2617 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2618 len -= ret; 2619 i++; 2620 } 2621 } 2622 2623 if (!i || len > 0) { 2624 err = -EINVAL; 2625 goto out; 2626 } 2627 2628 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2629 kma ? &k : NULL, net, NULL, 0); 2630 2631 out: 2632 return err; 2633 } 2634 #else 2635 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2636 const struct sadb_msg *hdr, void * const *ext_hdrs) 2637 { 2638 return -ENOPROTOOPT; 2639 } 2640 #endif 2641 2642 2643 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2644 { 2645 struct net *net = sock_net(sk); 2646 unsigned int dir; 2647 int err = 0, delete; 2648 struct sadb_x_policy *pol; 2649 struct xfrm_policy *xp; 2650 struct km_event c; 2651 2652 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2653 return -EINVAL; 2654 2655 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2656 if (dir >= XFRM_POLICY_MAX) 2657 return -EINVAL; 2658 2659 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2660 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2661 dir, pol->sadb_x_policy_id, delete, &err); 2662 if (xp == NULL) 2663 return -ENOENT; 2664 2665 if (delete) { 2666 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2667 2668 if (err) 2669 goto out; 2670 c.seq = hdr->sadb_msg_seq; 2671 c.portid = hdr->sadb_msg_pid; 2672 c.data.byid = 1; 2673 c.event = XFRM_MSG_DELPOLICY; 2674 km_policy_notify(xp, dir, &c); 2675 } else { 2676 err = key_pol_get_resp(sk, xp, hdr, dir); 2677 } 2678 2679 out: 2680 xfrm_pol_put(xp); 2681 return err; 2682 } 2683 2684 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2685 { 2686 struct pfkey_sock *pfk = ptr; 2687 struct sk_buff *out_skb; 2688 struct sadb_msg *out_hdr; 2689 int err; 2690 2691 if (!pfkey_can_dump(&pfk->sk)) 2692 return -ENOBUFS; 2693 2694 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2695 if (IS_ERR(out_skb)) 2696 return PTR_ERR(out_skb); 2697 2698 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2699 if (err < 0) { 2700 kfree_skb(out_skb); 2701 return err; 2702 } 2703 2704 out_hdr = (struct sadb_msg *) out_skb->data; 2705 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2706 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2707 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2708 out_hdr->sadb_msg_errno = 0; 2709 out_hdr->sadb_msg_seq = count + 1; 2710 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2711 2712 if (pfk->dump.skb) 2713 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2714 &pfk->sk, sock_net(&pfk->sk)); 2715 pfk->dump.skb = out_skb; 2716 2717 return 0; 2718 } 2719 2720 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2721 { 2722 struct net *net = sock_net(&pfk->sk); 2723 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2724 } 2725 2726 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2727 { 2728 struct net *net = sock_net((struct sock *)pfk); 2729 2730 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2731 } 2732 2733 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2734 { 2735 struct pfkey_sock *pfk = pfkey_sk(sk); 2736 2737 mutex_lock(&pfk->dump_lock); 2738 if (pfk->dump.dump != NULL) { 2739 mutex_unlock(&pfk->dump_lock); 2740 return -EBUSY; 2741 } 2742 2743 pfk->dump.msg_version = hdr->sadb_msg_version; 2744 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2745 pfk->dump.dump = pfkey_dump_sp; 2746 pfk->dump.done = pfkey_dump_sp_done; 2747 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2748 mutex_unlock(&pfk->dump_lock); 2749 2750 return pfkey_do_dump(pfk); 2751 } 2752 2753 static int key_notify_policy_flush(const struct km_event *c) 2754 { 2755 struct sk_buff *skb_out; 2756 struct sadb_msg *hdr; 2757 2758 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2759 if (!skb_out) 2760 return -ENOBUFS; 2761 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2762 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2763 hdr->sadb_msg_seq = c->seq; 2764 hdr->sadb_msg_pid = c->portid; 2765 hdr->sadb_msg_version = PF_KEY_V2; 2766 hdr->sadb_msg_errno = (uint8_t) 0; 2767 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2768 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2769 hdr->sadb_msg_reserved = 0; 2770 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2771 return 0; 2772 2773 } 2774 2775 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2776 { 2777 struct net *net = sock_net(sk); 2778 struct km_event c; 2779 int err, err2; 2780 2781 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2782 err2 = unicast_flush_resp(sk, hdr); 2783 if (err || err2) { 2784 if (err == -ESRCH) /* empty table - old silent behavior */ 2785 return 0; 2786 return err; 2787 } 2788 2789 c.data.type = XFRM_POLICY_TYPE_MAIN; 2790 c.event = XFRM_MSG_FLUSHPOLICY; 2791 c.portid = hdr->sadb_msg_pid; 2792 c.seq = hdr->sadb_msg_seq; 2793 c.net = net; 2794 km_policy_notify(NULL, 0, &c); 2795 2796 return 0; 2797 } 2798 2799 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2800 const struct sadb_msg *hdr, void * const *ext_hdrs); 2801 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2802 [SADB_RESERVED] = pfkey_reserved, 2803 [SADB_GETSPI] = pfkey_getspi, 2804 [SADB_UPDATE] = pfkey_add, 2805 [SADB_ADD] = pfkey_add, 2806 [SADB_DELETE] = pfkey_delete, 2807 [SADB_GET] = pfkey_get, 2808 [SADB_ACQUIRE] = pfkey_acquire, 2809 [SADB_REGISTER] = pfkey_register, 2810 [SADB_EXPIRE] = NULL, 2811 [SADB_FLUSH] = pfkey_flush, 2812 [SADB_DUMP] = pfkey_dump, 2813 [SADB_X_PROMISC] = pfkey_promisc, 2814 [SADB_X_PCHANGE] = NULL, 2815 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2816 [SADB_X_SPDADD] = pfkey_spdadd, 2817 [SADB_X_SPDDELETE] = pfkey_spddelete, 2818 [SADB_X_SPDGET] = pfkey_spdget, 2819 [SADB_X_SPDACQUIRE] = NULL, 2820 [SADB_X_SPDDUMP] = pfkey_spddump, 2821 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2822 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2823 [SADB_X_SPDDELETE2] = pfkey_spdget, 2824 [SADB_X_MIGRATE] = pfkey_migrate, 2825 }; 2826 2827 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2828 { 2829 void *ext_hdrs[SADB_EXT_MAX]; 2830 int err; 2831 2832 /* Non-zero return value of pfkey_broadcast() does not always signal 2833 * an error and even on an actual error we may still want to process 2834 * the message so rather ignore the return value. 2835 */ 2836 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2837 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2838 2839 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2840 err = parse_exthdrs(skb, hdr, ext_hdrs); 2841 if (!err) { 2842 err = -EOPNOTSUPP; 2843 if (pfkey_funcs[hdr->sadb_msg_type]) 2844 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2845 } 2846 return err; 2847 } 2848 2849 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2850 { 2851 struct sadb_msg *hdr = NULL; 2852 2853 if (skb->len < sizeof(*hdr)) { 2854 *errp = -EMSGSIZE; 2855 } else { 2856 hdr = (struct sadb_msg *) skb->data; 2857 if (hdr->sadb_msg_version != PF_KEY_V2 || 2858 hdr->sadb_msg_reserved != 0 || 2859 (hdr->sadb_msg_type <= SADB_RESERVED || 2860 hdr->sadb_msg_type > SADB_MAX)) { 2861 hdr = NULL; 2862 *errp = -EINVAL; 2863 } else if (hdr->sadb_msg_len != (skb->len / 2864 sizeof(uint64_t)) || 2865 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2866 sizeof(uint64_t))) { 2867 hdr = NULL; 2868 *errp = -EMSGSIZE; 2869 } else { 2870 *errp = 0; 2871 } 2872 } 2873 return hdr; 2874 } 2875 2876 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2877 const struct xfrm_algo_desc *d) 2878 { 2879 unsigned int id = d->desc.sadb_alg_id; 2880 2881 if (id >= sizeof(t->aalgos) * 8) 2882 return 0; 2883 2884 return (t->aalgos >> id) & 1; 2885 } 2886 2887 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2888 const struct xfrm_algo_desc *d) 2889 { 2890 unsigned int id = d->desc.sadb_alg_id; 2891 2892 if (id >= sizeof(t->ealgos) * 8) 2893 return 0; 2894 2895 return (t->ealgos >> id) & 1; 2896 } 2897 2898 static int count_ah_combs(const struct xfrm_tmpl *t) 2899 { 2900 int i, sz = 0; 2901 2902 for (i = 0; ; i++) { 2903 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2904 if (!aalg) 2905 break; 2906 if (!aalg->pfkey_supported) 2907 continue; 2908 if (aalg_tmpl_set(t, aalg)) 2909 sz += sizeof(struct sadb_comb); 2910 } 2911 return sz + sizeof(struct sadb_prop); 2912 } 2913 2914 static int count_esp_combs(const struct xfrm_tmpl *t) 2915 { 2916 int i, k, sz = 0; 2917 2918 for (i = 0; ; i++) { 2919 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2920 if (!ealg) 2921 break; 2922 2923 if (!ealg->pfkey_supported) 2924 continue; 2925 2926 if (!(ealg_tmpl_set(t, ealg))) 2927 continue; 2928 2929 for (k = 1; ; k++) { 2930 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2931 if (!aalg) 2932 break; 2933 2934 if (!aalg->pfkey_supported) 2935 continue; 2936 2937 if (aalg_tmpl_set(t, aalg)) 2938 sz += sizeof(struct sadb_comb); 2939 } 2940 } 2941 return sz + sizeof(struct sadb_prop); 2942 } 2943 2944 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2945 { 2946 struct sadb_prop *p; 2947 int sz = 0; 2948 int i; 2949 2950 p = skb_put(skb, sizeof(struct sadb_prop)); 2951 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2952 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2953 p->sadb_prop_replay = 32; 2954 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2955 2956 for (i = 0; ; i++) { 2957 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2958 if (!aalg) 2959 break; 2960 2961 if (!aalg->pfkey_supported) 2962 continue; 2963 2964 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2965 struct sadb_comb *c; 2966 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2967 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2968 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2969 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2970 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2971 c->sadb_comb_hard_addtime = 24*60*60; 2972 c->sadb_comb_soft_addtime = 20*60*60; 2973 c->sadb_comb_hard_usetime = 8*60*60; 2974 c->sadb_comb_soft_usetime = 7*60*60; 2975 sz += sizeof(*c); 2976 } 2977 } 2978 2979 return sz + sizeof(*p); 2980 } 2981 2982 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2983 { 2984 struct sadb_prop *p; 2985 int sz = 0; 2986 int i, k; 2987 2988 p = skb_put(skb, sizeof(struct sadb_prop)); 2989 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2990 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2991 p->sadb_prop_replay = 32; 2992 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2993 2994 for (i=0; ; i++) { 2995 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2996 if (!ealg) 2997 break; 2998 2999 if (!ealg->pfkey_supported) 3000 continue; 3001 3002 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 3003 continue; 3004 3005 for (k = 1; ; k++) { 3006 struct sadb_comb *c; 3007 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3008 if (!aalg) 3009 break; 3010 if (!aalg->pfkey_supported) 3011 continue; 3012 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3013 continue; 3014 c = skb_put(skb, sizeof(struct sadb_comb)); 3015 memset(c, 0, sizeof(*c)); 3016 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3017 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3018 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3019 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3020 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3021 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3022 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3023 c->sadb_comb_hard_addtime = 24*60*60; 3024 c->sadb_comb_soft_addtime = 20*60*60; 3025 c->sadb_comb_hard_usetime = 8*60*60; 3026 c->sadb_comb_soft_usetime = 7*60*60; 3027 sz += sizeof(*c); 3028 } 3029 } 3030 3031 return sz + sizeof(*p); 3032 } 3033 3034 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3035 { 3036 return 0; 3037 } 3038 3039 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3040 { 3041 struct sk_buff *out_skb; 3042 struct sadb_msg *out_hdr; 3043 int hard; 3044 int hsc; 3045 3046 hard = c->data.hard; 3047 if (hard) 3048 hsc = 2; 3049 else 3050 hsc = 1; 3051 3052 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3053 if (IS_ERR(out_skb)) 3054 return PTR_ERR(out_skb); 3055 3056 out_hdr = (struct sadb_msg *) out_skb->data; 3057 out_hdr->sadb_msg_version = PF_KEY_V2; 3058 out_hdr->sadb_msg_type = SADB_EXPIRE; 3059 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3060 out_hdr->sadb_msg_errno = 0; 3061 out_hdr->sadb_msg_reserved = 0; 3062 out_hdr->sadb_msg_seq = 0; 3063 out_hdr->sadb_msg_pid = 0; 3064 3065 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3066 xs_net(x)); 3067 return 0; 3068 } 3069 3070 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3071 { 3072 struct net *net = x ? xs_net(x) : c->net; 3073 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3074 3075 if (atomic_read(&net_pfkey->socks_nr) == 0) 3076 return 0; 3077 3078 switch (c->event) { 3079 case XFRM_MSG_EXPIRE: 3080 return key_notify_sa_expire(x, c); 3081 case XFRM_MSG_DELSA: 3082 case XFRM_MSG_NEWSA: 3083 case XFRM_MSG_UPDSA: 3084 return key_notify_sa(x, c); 3085 case XFRM_MSG_FLUSHSA: 3086 return key_notify_sa_flush(c); 3087 case XFRM_MSG_NEWAE: /* not yet supported */ 3088 break; 3089 default: 3090 pr_err("pfkey: Unknown SA event %d\n", c->event); 3091 break; 3092 } 3093 3094 return 0; 3095 } 3096 3097 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3098 { 3099 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3100 return 0; 3101 3102 switch (c->event) { 3103 case XFRM_MSG_POLEXPIRE: 3104 return key_notify_policy_expire(xp, c); 3105 case XFRM_MSG_DELPOLICY: 3106 case XFRM_MSG_NEWPOLICY: 3107 case XFRM_MSG_UPDPOLICY: 3108 return key_notify_policy(xp, dir, c); 3109 case XFRM_MSG_FLUSHPOLICY: 3110 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3111 break; 3112 return key_notify_policy_flush(c); 3113 default: 3114 pr_err("pfkey: Unknown policy event %d\n", c->event); 3115 break; 3116 } 3117 3118 return 0; 3119 } 3120 3121 static u32 get_acqseq(void) 3122 { 3123 u32 res; 3124 static atomic_t acqseq; 3125 3126 do { 3127 res = atomic_inc_return(&acqseq); 3128 } while (!res); 3129 return res; 3130 } 3131 3132 static bool pfkey_is_alive(const struct km_event *c) 3133 { 3134 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3135 struct sock *sk; 3136 bool is_alive = false; 3137 3138 rcu_read_lock(); 3139 sk_for_each_rcu(sk, &net_pfkey->table) { 3140 if (pfkey_sk(sk)->registered) { 3141 is_alive = true; 3142 break; 3143 } 3144 } 3145 rcu_read_unlock(); 3146 3147 return is_alive; 3148 } 3149 3150 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3151 { 3152 struct sk_buff *skb; 3153 struct sadb_msg *hdr; 3154 struct sadb_address *addr; 3155 struct sadb_x_policy *pol; 3156 int sockaddr_size; 3157 int size; 3158 struct sadb_x_sec_ctx *sec_ctx; 3159 struct xfrm_sec_ctx *xfrm_ctx; 3160 int ctx_size = 0; 3161 int alg_size = 0; 3162 3163 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3164 if (!sockaddr_size) 3165 return -EINVAL; 3166 3167 size = sizeof(struct sadb_msg) + 3168 (sizeof(struct sadb_address) * 2) + 3169 (sockaddr_size * 2) + 3170 sizeof(struct sadb_x_policy); 3171 3172 if (x->id.proto == IPPROTO_AH) 3173 alg_size = count_ah_combs(t); 3174 else if (x->id.proto == IPPROTO_ESP) 3175 alg_size = count_esp_combs(t); 3176 3177 if ((xfrm_ctx = x->security)) { 3178 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3179 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3180 } 3181 3182 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC); 3183 if (skb == NULL) 3184 return -ENOMEM; 3185 3186 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3187 hdr->sadb_msg_version = PF_KEY_V2; 3188 hdr->sadb_msg_type = SADB_ACQUIRE; 3189 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3190 hdr->sadb_msg_len = size / sizeof(uint64_t); 3191 hdr->sadb_msg_errno = 0; 3192 hdr->sadb_msg_reserved = 0; 3193 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3194 hdr->sadb_msg_pid = 0; 3195 3196 /* src address */ 3197 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3198 addr->sadb_address_len = 3199 (sizeof(struct sadb_address)+sockaddr_size)/ 3200 sizeof(uint64_t); 3201 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3202 addr->sadb_address_proto = 0; 3203 addr->sadb_address_reserved = 0; 3204 addr->sadb_address_prefixlen = 3205 pfkey_sockaddr_fill(&x->props.saddr, 0, 3206 (struct sockaddr *) (addr + 1), 3207 x->props.family); 3208 if (!addr->sadb_address_prefixlen) 3209 BUG(); 3210 3211 /* dst address */ 3212 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3213 addr->sadb_address_len = 3214 (sizeof(struct sadb_address)+sockaddr_size)/ 3215 sizeof(uint64_t); 3216 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3217 addr->sadb_address_proto = 0; 3218 addr->sadb_address_reserved = 0; 3219 addr->sadb_address_prefixlen = 3220 pfkey_sockaddr_fill(&x->id.daddr, 0, 3221 (struct sockaddr *) (addr + 1), 3222 x->props.family); 3223 if (!addr->sadb_address_prefixlen) 3224 BUG(); 3225 3226 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3227 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3228 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3229 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3230 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3231 pol->sadb_x_policy_reserved = 0; 3232 pol->sadb_x_policy_id = xp->index; 3233 pol->sadb_x_policy_priority = xp->priority; 3234 3235 /* Set sadb_comb's. */ 3236 alg_size = 0; 3237 if (x->id.proto == IPPROTO_AH) 3238 alg_size = dump_ah_combs(skb, t); 3239 else if (x->id.proto == IPPROTO_ESP) 3240 alg_size = dump_esp_combs(skb, t); 3241 3242 hdr->sadb_msg_len += alg_size / 8; 3243 3244 /* security context */ 3245 if (xfrm_ctx) { 3246 sec_ctx = skb_put(skb, 3247 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3248 sec_ctx->sadb_x_sec_len = 3249 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3250 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3251 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3252 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3253 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3254 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3255 xfrm_ctx->ctx_len); 3256 } 3257 3258 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3259 xs_net(x)); 3260 } 3261 3262 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3263 u8 *data, int len, int *dir) 3264 { 3265 struct net *net = sock_net(sk); 3266 struct xfrm_policy *xp; 3267 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3268 struct sadb_x_sec_ctx *sec_ctx; 3269 3270 switch (sk->sk_family) { 3271 case AF_INET: 3272 if (opt != IP_IPSEC_POLICY) { 3273 *dir = -EOPNOTSUPP; 3274 return NULL; 3275 } 3276 break; 3277 #if IS_ENABLED(CONFIG_IPV6) 3278 case AF_INET6: 3279 if (opt != IPV6_IPSEC_POLICY) { 3280 *dir = -EOPNOTSUPP; 3281 return NULL; 3282 } 3283 break; 3284 #endif 3285 default: 3286 *dir = -EINVAL; 3287 return NULL; 3288 } 3289 3290 *dir = -EINVAL; 3291 3292 if (len < sizeof(struct sadb_x_policy) || 3293 pol->sadb_x_policy_len*8 > len || 3294 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3295 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3296 return NULL; 3297 3298 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3299 if (xp == NULL) { 3300 *dir = -ENOBUFS; 3301 return NULL; 3302 } 3303 3304 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3305 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3306 3307 xp->lft.soft_byte_limit = XFRM_INF; 3308 xp->lft.hard_byte_limit = XFRM_INF; 3309 xp->lft.soft_packet_limit = XFRM_INF; 3310 xp->lft.hard_packet_limit = XFRM_INF; 3311 xp->family = sk->sk_family; 3312 3313 xp->xfrm_nr = 0; 3314 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3315 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3316 goto out; 3317 3318 /* security context too */ 3319 if (len >= (pol->sadb_x_policy_len*8 + 3320 sizeof(struct sadb_x_sec_ctx))) { 3321 char *p = (char *)pol; 3322 struct xfrm_user_sec_ctx *uctx; 3323 3324 p += pol->sadb_x_policy_len*8; 3325 sec_ctx = (struct sadb_x_sec_ctx *)p; 3326 if (len < pol->sadb_x_policy_len*8 + 3327 sec_ctx->sadb_x_sec_len*8) { 3328 *dir = -EINVAL; 3329 goto out; 3330 } 3331 if ((*dir = verify_sec_ctx_len(p))) 3332 goto out; 3333 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3334 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3335 kfree(uctx); 3336 3337 if (*dir) 3338 goto out; 3339 } 3340 3341 *dir = pol->sadb_x_policy_dir-1; 3342 return xp; 3343 3344 out: 3345 xp->walk.dead = 1; 3346 xfrm_policy_destroy(xp); 3347 return NULL; 3348 } 3349 3350 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3351 { 3352 struct sk_buff *skb; 3353 struct sadb_msg *hdr; 3354 struct sadb_sa *sa; 3355 struct sadb_address *addr; 3356 struct sadb_x_nat_t_port *n_port; 3357 int sockaddr_size; 3358 int size; 3359 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3360 struct xfrm_encap_tmpl *natt = NULL; 3361 3362 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3363 if (!sockaddr_size) 3364 return -EINVAL; 3365 3366 if (!satype) 3367 return -EINVAL; 3368 3369 if (!x->encap) 3370 return -EINVAL; 3371 3372 natt = x->encap; 3373 3374 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3375 * 3376 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3377 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3378 */ 3379 3380 size = sizeof(struct sadb_msg) + 3381 sizeof(struct sadb_sa) + 3382 (sizeof(struct sadb_address) * 2) + 3383 (sockaddr_size * 2) + 3384 (sizeof(struct sadb_x_nat_t_port) * 2); 3385 3386 skb = alloc_skb(size + 16, GFP_ATOMIC); 3387 if (skb == NULL) 3388 return -ENOMEM; 3389 3390 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3391 hdr->sadb_msg_version = PF_KEY_V2; 3392 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3393 hdr->sadb_msg_satype = satype; 3394 hdr->sadb_msg_len = size / sizeof(uint64_t); 3395 hdr->sadb_msg_errno = 0; 3396 hdr->sadb_msg_reserved = 0; 3397 hdr->sadb_msg_seq = x->km.seq; 3398 hdr->sadb_msg_pid = 0; 3399 3400 /* SA */ 3401 sa = skb_put(skb, sizeof(struct sadb_sa)); 3402 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3403 sa->sadb_sa_exttype = SADB_EXT_SA; 3404 sa->sadb_sa_spi = x->id.spi; 3405 sa->sadb_sa_replay = 0; 3406 sa->sadb_sa_state = 0; 3407 sa->sadb_sa_auth = 0; 3408 sa->sadb_sa_encrypt = 0; 3409 sa->sadb_sa_flags = 0; 3410 3411 /* ADDRESS_SRC (old addr) */ 3412 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3413 addr->sadb_address_len = 3414 (sizeof(struct sadb_address)+sockaddr_size)/ 3415 sizeof(uint64_t); 3416 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3417 addr->sadb_address_proto = 0; 3418 addr->sadb_address_reserved = 0; 3419 addr->sadb_address_prefixlen = 3420 pfkey_sockaddr_fill(&x->props.saddr, 0, 3421 (struct sockaddr *) (addr + 1), 3422 x->props.family); 3423 if (!addr->sadb_address_prefixlen) 3424 BUG(); 3425 3426 /* NAT_T_SPORT (old port) */ 3427 n_port = skb_put(skb, sizeof(*n_port)); 3428 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3429 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3430 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3431 n_port->sadb_x_nat_t_port_reserved = 0; 3432 3433 /* ADDRESS_DST (new addr) */ 3434 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3435 addr->sadb_address_len = 3436 (sizeof(struct sadb_address)+sockaddr_size)/ 3437 sizeof(uint64_t); 3438 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3439 addr->sadb_address_proto = 0; 3440 addr->sadb_address_reserved = 0; 3441 addr->sadb_address_prefixlen = 3442 pfkey_sockaddr_fill(ipaddr, 0, 3443 (struct sockaddr *) (addr + 1), 3444 x->props.family); 3445 if (!addr->sadb_address_prefixlen) 3446 BUG(); 3447 3448 /* NAT_T_DPORT (new port) */ 3449 n_port = skb_put(skb, sizeof(*n_port)); 3450 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3451 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3452 n_port->sadb_x_nat_t_port_port = sport; 3453 n_port->sadb_x_nat_t_port_reserved = 0; 3454 3455 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3456 xs_net(x)); 3457 } 3458 3459 #ifdef CONFIG_NET_KEY_MIGRATE 3460 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3461 const struct xfrm_selector *sel) 3462 { 3463 struct sadb_address *addr; 3464 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3465 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3466 addr->sadb_address_exttype = type; 3467 addr->sadb_address_proto = sel->proto; 3468 addr->sadb_address_reserved = 0; 3469 3470 switch (type) { 3471 case SADB_EXT_ADDRESS_SRC: 3472 addr->sadb_address_prefixlen = sel->prefixlen_s; 3473 pfkey_sockaddr_fill(&sel->saddr, 0, 3474 (struct sockaddr *)(addr + 1), 3475 sel->family); 3476 break; 3477 case SADB_EXT_ADDRESS_DST: 3478 addr->sadb_address_prefixlen = sel->prefixlen_d; 3479 pfkey_sockaddr_fill(&sel->daddr, 0, 3480 (struct sockaddr *)(addr + 1), 3481 sel->family); 3482 break; 3483 default: 3484 return -EINVAL; 3485 } 3486 3487 return 0; 3488 } 3489 3490 3491 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3492 { 3493 struct sadb_x_kmaddress *kma; 3494 u8 *sa; 3495 int family = k->family; 3496 int socklen = pfkey_sockaddr_len(family); 3497 int size_req; 3498 3499 size_req = (sizeof(struct sadb_x_kmaddress) + 3500 pfkey_sockaddr_pair_size(family)); 3501 3502 kma = skb_put_zero(skb, size_req); 3503 kma->sadb_x_kmaddress_len = size_req / 8; 3504 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3505 kma->sadb_x_kmaddress_reserved = k->reserved; 3506 3507 sa = (u8 *)(kma + 1); 3508 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3509 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3510 return -EINVAL; 3511 3512 return 0; 3513 } 3514 3515 static int set_ipsecrequest(struct sk_buff *skb, 3516 uint8_t proto, uint8_t mode, int level, 3517 uint32_t reqid, uint8_t family, 3518 const xfrm_address_t *src, const xfrm_address_t *dst) 3519 { 3520 struct sadb_x_ipsecrequest *rq; 3521 u8 *sa; 3522 int socklen = pfkey_sockaddr_len(family); 3523 int size_req; 3524 3525 size_req = sizeof(struct sadb_x_ipsecrequest) + 3526 pfkey_sockaddr_pair_size(family); 3527 3528 rq = skb_put_zero(skb, size_req); 3529 rq->sadb_x_ipsecrequest_len = size_req; 3530 rq->sadb_x_ipsecrequest_proto = proto; 3531 rq->sadb_x_ipsecrequest_mode = mode; 3532 rq->sadb_x_ipsecrequest_level = level; 3533 rq->sadb_x_ipsecrequest_reqid = reqid; 3534 3535 sa = (u8 *) (rq + 1); 3536 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3537 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3538 return -EINVAL; 3539 3540 return 0; 3541 } 3542 #endif 3543 3544 #ifdef CONFIG_NET_KEY_MIGRATE 3545 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3546 const struct xfrm_migrate *m, int num_bundles, 3547 const struct xfrm_kmaddress *k, 3548 const struct xfrm_encap_tmpl *encap) 3549 { 3550 int i; 3551 int sasize_sel; 3552 int size = 0; 3553 int size_pol = 0; 3554 struct sk_buff *skb; 3555 struct sadb_msg *hdr; 3556 struct sadb_x_policy *pol; 3557 const struct xfrm_migrate *mp; 3558 3559 if (type != XFRM_POLICY_TYPE_MAIN) 3560 return 0; 3561 3562 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3563 return -EINVAL; 3564 3565 if (k != NULL) { 3566 /* addresses for KM */ 3567 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3568 pfkey_sockaddr_pair_size(k->family)); 3569 } 3570 3571 /* selector */ 3572 sasize_sel = pfkey_sockaddr_size(sel->family); 3573 if (!sasize_sel) 3574 return -EINVAL; 3575 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3576 3577 /* policy info */ 3578 size_pol += sizeof(struct sadb_x_policy); 3579 3580 /* ipsecrequests */ 3581 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3582 /* old locator pair */ 3583 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3584 pfkey_sockaddr_pair_size(mp->old_family); 3585 /* new locator pair */ 3586 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3587 pfkey_sockaddr_pair_size(mp->new_family); 3588 } 3589 3590 size += sizeof(struct sadb_msg) + size_pol; 3591 3592 /* alloc buffer */ 3593 skb = alloc_skb(size, GFP_ATOMIC); 3594 if (skb == NULL) 3595 return -ENOMEM; 3596 3597 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3598 hdr->sadb_msg_version = PF_KEY_V2; 3599 hdr->sadb_msg_type = SADB_X_MIGRATE; 3600 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3601 hdr->sadb_msg_len = size / 8; 3602 hdr->sadb_msg_errno = 0; 3603 hdr->sadb_msg_reserved = 0; 3604 hdr->sadb_msg_seq = 0; 3605 hdr->sadb_msg_pid = 0; 3606 3607 /* Addresses to be used by KM for negotiation, if ext is available */ 3608 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3609 goto err; 3610 3611 /* selector src */ 3612 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3613 3614 /* selector dst */ 3615 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3616 3617 /* policy information */ 3618 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3619 pol->sadb_x_policy_len = size_pol / 8; 3620 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3621 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3622 pol->sadb_x_policy_dir = dir + 1; 3623 pol->sadb_x_policy_reserved = 0; 3624 pol->sadb_x_policy_id = 0; 3625 pol->sadb_x_policy_priority = 0; 3626 3627 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3628 /* old ipsecrequest */ 3629 int mode = pfkey_mode_from_xfrm(mp->mode); 3630 if (mode < 0) 3631 goto err; 3632 if (set_ipsecrequest(skb, mp->proto, mode, 3633 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3634 mp->reqid, mp->old_family, 3635 &mp->old_saddr, &mp->old_daddr) < 0) 3636 goto err; 3637 3638 /* new ipsecrequest */ 3639 if (set_ipsecrequest(skb, mp->proto, mode, 3640 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3641 mp->reqid, mp->new_family, 3642 &mp->new_saddr, &mp->new_daddr) < 0) 3643 goto err; 3644 } 3645 3646 /* broadcast migrate message to sockets */ 3647 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3648 3649 return 0; 3650 3651 err: 3652 kfree_skb(skb); 3653 return -EINVAL; 3654 } 3655 #else 3656 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3657 const struct xfrm_migrate *m, int num_bundles, 3658 const struct xfrm_kmaddress *k, 3659 const struct xfrm_encap_tmpl *encap) 3660 { 3661 return -ENOPROTOOPT; 3662 } 3663 #endif 3664 3665 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3666 { 3667 struct sock *sk = sock->sk; 3668 struct sk_buff *skb = NULL; 3669 struct sadb_msg *hdr = NULL; 3670 int err; 3671 struct net *net = sock_net(sk); 3672 3673 err = -EOPNOTSUPP; 3674 if (msg->msg_flags & MSG_OOB) 3675 goto out; 3676 3677 err = -EMSGSIZE; 3678 if ((unsigned int)len > sk->sk_sndbuf - 32) 3679 goto out; 3680 3681 err = -ENOBUFS; 3682 skb = alloc_skb(len, GFP_KERNEL); 3683 if (skb == NULL) 3684 goto out; 3685 3686 err = -EFAULT; 3687 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3688 goto out; 3689 3690 hdr = pfkey_get_base_msg(skb, &err); 3691 if (!hdr) 3692 goto out; 3693 3694 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3695 err = pfkey_process(sk, skb, hdr); 3696 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3697 3698 out: 3699 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3700 err = 0; 3701 kfree_skb(skb); 3702 3703 return err ? : len; 3704 } 3705 3706 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3707 int flags) 3708 { 3709 struct sock *sk = sock->sk; 3710 struct pfkey_sock *pfk = pfkey_sk(sk); 3711 struct sk_buff *skb; 3712 int copied, err; 3713 3714 err = -EINVAL; 3715 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3716 goto out; 3717 3718 skb = skb_recv_datagram(sk, flags, &err); 3719 if (skb == NULL) 3720 goto out; 3721 3722 copied = skb->len; 3723 if (copied > len) { 3724 msg->msg_flags |= MSG_TRUNC; 3725 copied = len; 3726 } 3727 3728 skb_reset_transport_header(skb); 3729 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3730 if (err) 3731 goto out_free; 3732 3733 sock_recv_cmsgs(msg, sk, skb); 3734 3735 err = (flags & MSG_TRUNC) ? skb->len : copied; 3736 3737 if (pfk->dump.dump != NULL && 3738 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3739 pfkey_do_dump(pfk); 3740 3741 out_free: 3742 skb_free_datagram(sk, skb); 3743 out: 3744 return err; 3745 } 3746 3747 static const struct proto_ops pfkey_ops = { 3748 .family = PF_KEY, 3749 .owner = THIS_MODULE, 3750 /* Operations that make no sense on pfkey sockets. */ 3751 .bind = sock_no_bind, 3752 .connect = sock_no_connect, 3753 .socketpair = sock_no_socketpair, 3754 .accept = sock_no_accept, 3755 .getname = sock_no_getname, 3756 .ioctl = sock_no_ioctl, 3757 .listen = sock_no_listen, 3758 .shutdown = sock_no_shutdown, 3759 .mmap = sock_no_mmap, 3760 .sendpage = sock_no_sendpage, 3761 3762 /* Now the operations that really occur. */ 3763 .release = pfkey_release, 3764 .poll = datagram_poll, 3765 .sendmsg = pfkey_sendmsg, 3766 .recvmsg = pfkey_recvmsg, 3767 }; 3768 3769 static const struct net_proto_family pfkey_family_ops = { 3770 .family = PF_KEY, 3771 .create = pfkey_create, 3772 .owner = THIS_MODULE, 3773 }; 3774 3775 #ifdef CONFIG_PROC_FS 3776 static int pfkey_seq_show(struct seq_file *f, void *v) 3777 { 3778 struct sock *s = sk_entry(v); 3779 3780 if (v == SEQ_START_TOKEN) 3781 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3782 else 3783 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3784 s, 3785 refcount_read(&s->sk_refcnt), 3786 sk_rmem_alloc_get(s), 3787 sk_wmem_alloc_get(s), 3788 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3789 sock_i_ino(s) 3790 ); 3791 return 0; 3792 } 3793 3794 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3795 __acquires(rcu) 3796 { 3797 struct net *net = seq_file_net(f); 3798 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3799 3800 rcu_read_lock(); 3801 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3802 } 3803 3804 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3805 { 3806 struct net *net = seq_file_net(f); 3807 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3808 3809 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3810 } 3811 3812 static void pfkey_seq_stop(struct seq_file *f, void *v) 3813 __releases(rcu) 3814 { 3815 rcu_read_unlock(); 3816 } 3817 3818 static const struct seq_operations pfkey_seq_ops = { 3819 .start = pfkey_seq_start, 3820 .next = pfkey_seq_next, 3821 .stop = pfkey_seq_stop, 3822 .show = pfkey_seq_show, 3823 }; 3824 3825 static int __net_init pfkey_init_proc(struct net *net) 3826 { 3827 struct proc_dir_entry *e; 3828 3829 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3830 sizeof(struct seq_net_private)); 3831 if (e == NULL) 3832 return -ENOMEM; 3833 3834 return 0; 3835 } 3836 3837 static void __net_exit pfkey_exit_proc(struct net *net) 3838 { 3839 remove_proc_entry("pfkey", net->proc_net); 3840 } 3841 #else 3842 static inline int pfkey_init_proc(struct net *net) 3843 { 3844 return 0; 3845 } 3846 3847 static inline void pfkey_exit_proc(struct net *net) 3848 { 3849 } 3850 #endif 3851 3852 static struct xfrm_mgr pfkeyv2_mgr = 3853 { 3854 .notify = pfkey_send_notify, 3855 .acquire = pfkey_send_acquire, 3856 .compile_policy = pfkey_compile_policy, 3857 .new_mapping = pfkey_send_new_mapping, 3858 .notify_policy = pfkey_send_policy_notify, 3859 .migrate = pfkey_send_migrate, 3860 .is_alive = pfkey_is_alive, 3861 }; 3862 3863 static int __net_init pfkey_net_init(struct net *net) 3864 { 3865 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3866 int rv; 3867 3868 INIT_HLIST_HEAD(&net_pfkey->table); 3869 atomic_set(&net_pfkey->socks_nr, 0); 3870 3871 rv = pfkey_init_proc(net); 3872 3873 return rv; 3874 } 3875 3876 static void __net_exit pfkey_net_exit(struct net *net) 3877 { 3878 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3879 3880 pfkey_exit_proc(net); 3881 WARN_ON(!hlist_empty(&net_pfkey->table)); 3882 } 3883 3884 static struct pernet_operations pfkey_net_ops = { 3885 .init = pfkey_net_init, 3886 .exit = pfkey_net_exit, 3887 .id = &pfkey_net_id, 3888 .size = sizeof(struct netns_pfkey), 3889 }; 3890 3891 static void __exit ipsec_pfkey_exit(void) 3892 { 3893 xfrm_unregister_km(&pfkeyv2_mgr); 3894 sock_unregister(PF_KEY); 3895 unregister_pernet_subsys(&pfkey_net_ops); 3896 proto_unregister(&key_proto); 3897 } 3898 3899 static int __init ipsec_pfkey_init(void) 3900 { 3901 int err = proto_register(&key_proto, 0); 3902 3903 if (err != 0) 3904 goto out; 3905 3906 err = register_pernet_subsys(&pfkey_net_ops); 3907 if (err != 0) 3908 goto out_unregister_key_proto; 3909 err = sock_register(&pfkey_family_ops); 3910 if (err != 0) 3911 goto out_unregister_pernet; 3912 xfrm_register_km(&pfkeyv2_mgr); 3913 out: 3914 return err; 3915 3916 out_unregister_pernet: 3917 unregister_pernet_subsys(&pfkey_net_ops); 3918 out_unregister_key_proto: 3919 proto_unregister(&key_proto); 3920 goto out; 3921 } 3922 3923 module_init(ipsec_pfkey_init); 3924 module_exit(ipsec_pfkey_exit); 3925 MODULE_LICENSE("GPL"); 3926 MODULE_ALIAS_NETPROTO(PF_KEY); 3927