1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <net/net_namespace.h> 31 #include <net/netns/generic.h> 32 #include <net/xfrm.h> 33 34 #include <net/sock.h> 35 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 38 39 static unsigned int pfkey_net_id __read_mostly; 40 struct netns_pfkey { 41 /* List of all pfkey sockets. */ 42 struct hlist_head table; 43 atomic_t socks_nr; 44 }; 45 static DEFINE_MUTEX(pfkey_mutex); 46 47 #define DUMMY_MARK 0 48 static const struct xfrm_mark dummy_mark = {0, 0}; 49 struct pfkey_sock { 50 /* struct sock must be the first member of struct pfkey_sock */ 51 struct sock sk; 52 int registered; 53 int promisc; 54 55 struct { 56 uint8_t msg_version; 57 uint32_t msg_portid; 58 int (*dump)(struct pfkey_sock *sk); 59 void (*done)(struct pfkey_sock *sk); 60 union { 61 struct xfrm_policy_walk policy; 62 struct xfrm_state_walk state; 63 } u; 64 struct sk_buff *skb; 65 } dump; 66 struct mutex dump_lock; 67 }; 68 69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 70 xfrm_address_t *saddr, xfrm_address_t *daddr, 71 u16 *family); 72 73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 74 { 75 return (struct pfkey_sock *)sk; 76 } 77 78 static int pfkey_can_dump(const struct sock *sk) 79 { 80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 81 return 1; 82 return 0; 83 } 84 85 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 86 { 87 if (pfk->dump.dump) { 88 if (pfk->dump.skb) { 89 kfree_skb(pfk->dump.skb); 90 pfk->dump.skb = NULL; 91 } 92 pfk->dump.done(pfk); 93 pfk->dump.dump = NULL; 94 pfk->dump.done = NULL; 95 } 96 } 97 98 static void pfkey_sock_destruct(struct sock *sk) 99 { 100 struct net *net = sock_net(sk); 101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 102 103 pfkey_terminate_dump(pfkey_sk(sk)); 104 skb_queue_purge(&sk->sk_receive_queue); 105 106 if (!sock_flag(sk, SOCK_DEAD)) { 107 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 108 return; 109 } 110 111 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 112 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 113 114 atomic_dec(&net_pfkey->socks_nr); 115 } 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 struct net *net = sock_net(sk); 122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 123 124 mutex_lock(&pfkey_mutex); 125 sk_add_node_rcu(sk, &net_pfkey->table); 126 mutex_unlock(&pfkey_mutex); 127 } 128 129 static void pfkey_remove(struct sock *sk) 130 { 131 mutex_lock(&pfkey_mutex); 132 sk_del_node_init_rcu(sk); 133 mutex_unlock(&pfkey_mutex); 134 } 135 136 static struct proto key_proto = { 137 .name = "KEY", 138 .owner = THIS_MODULE, 139 .obj_size = sizeof(struct pfkey_sock), 140 }; 141 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 143 int kern) 144 { 145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 146 struct sock *sk; 147 struct pfkey_sock *pfk; 148 int err; 149 150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 151 return -EPERM; 152 if (sock->type != SOCK_RAW) 153 return -ESOCKTNOSUPPORT; 154 if (protocol != PF_KEY_V2) 155 return -EPROTONOSUPPORT; 156 157 err = -ENOMEM; 158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 159 if (sk == NULL) 160 goto out; 161 162 pfk = pfkey_sk(sk); 163 mutex_init(&pfk->dump_lock); 164 165 sock->ops = &pfkey_ops; 166 sock_init_data(sock, sk); 167 168 sk->sk_family = PF_KEY; 169 sk->sk_destruct = pfkey_sock_destruct; 170 171 atomic_inc(&net_pfkey->socks_nr); 172 173 pfkey_insert(sk); 174 175 return 0; 176 out: 177 return err; 178 } 179 180 static int pfkey_release(struct socket *sock) 181 { 182 struct sock *sk = sock->sk; 183 184 if (!sk) 185 return 0; 186 187 pfkey_remove(sk); 188 189 sock_orphan(sk); 190 sock->sk = NULL; 191 skb_queue_purge(&sk->sk_write_queue); 192 193 synchronize_rcu(); 194 sock_put(sk); 195 196 return 0; 197 } 198 199 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 200 gfp_t allocation, struct sock *sk) 201 { 202 int err = -ENOBUFS; 203 204 sock_hold(sk); 205 if (*skb2 == NULL) { 206 if (refcount_read(&skb->users) != 1) { 207 *skb2 = skb_clone(skb, allocation); 208 } else { 209 *skb2 = skb; 210 refcount_inc(&skb->users); 211 } 212 } 213 if (*skb2 != NULL) { 214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 215 skb_set_owner_r(*skb2, sk); 216 skb_queue_tail(&sk->sk_receive_queue, *skb2); 217 sk->sk_data_ready(sk); 218 *skb2 = NULL; 219 err = 0; 220 } 221 } 222 sock_put(sk); 223 return err; 224 } 225 226 /* Send SKB to all pfkey sockets matching selected criteria. */ 227 #define BROADCAST_ALL 0 228 #define BROADCAST_ONE 1 229 #define BROADCAST_REGISTERED 2 230 #define BROADCAST_PROMISC_ONLY 4 231 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 232 int broadcast_flags, struct sock *one_sk, 233 struct net *net) 234 { 235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 236 struct sock *sk; 237 struct sk_buff *skb2 = NULL; 238 int err = -ESRCH; 239 240 /* XXX Do we need something like netlink_overrun? I think 241 * XXX PF_KEY socket apps will not mind current behavior. 242 */ 243 if (!skb) 244 return -ENOMEM; 245 246 rcu_read_lock(); 247 sk_for_each_rcu(sk, &net_pfkey->table) { 248 struct pfkey_sock *pfk = pfkey_sk(sk); 249 int err2; 250 251 /* Yes, it means that if you are meant to receive this 252 * pfkey message you receive it twice as promiscuous 253 * socket. 254 */ 255 if (pfk->promisc) 256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 257 258 /* the exact target will be processed later */ 259 if (sk == one_sk) 260 continue; 261 if (broadcast_flags != BROADCAST_ALL) { 262 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 263 continue; 264 if ((broadcast_flags & BROADCAST_REGISTERED) && 265 !pfk->registered) 266 continue; 267 if (broadcast_flags & BROADCAST_ONE) 268 continue; 269 } 270 271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 272 273 /* Error is cleared after successful sending to at least one 274 * registered KM */ 275 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 276 err = err2; 277 } 278 rcu_read_unlock(); 279 280 if (one_sk != NULL) 281 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 282 283 kfree_skb(skb2); 284 kfree_skb(skb); 285 return err; 286 } 287 288 static int pfkey_do_dump(struct pfkey_sock *pfk) 289 { 290 struct sadb_msg *hdr; 291 int rc; 292 293 mutex_lock(&pfk->dump_lock); 294 if (!pfk->dump.dump) { 295 rc = 0; 296 goto out; 297 } 298 299 rc = pfk->dump.dump(pfk); 300 if (rc == -ENOBUFS) { 301 rc = 0; 302 goto out; 303 } 304 305 if (pfk->dump.skb) { 306 if (!pfkey_can_dump(&pfk->sk)) { 307 rc = 0; 308 goto out; 309 } 310 311 hdr = (struct sadb_msg *) pfk->dump.skb->data; 312 hdr->sadb_msg_seq = 0; 313 hdr->sadb_msg_errno = rc; 314 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 315 &pfk->sk, sock_net(&pfk->sk)); 316 pfk->dump.skb = NULL; 317 } 318 319 pfkey_terminate_dump(pfk); 320 321 out: 322 mutex_unlock(&pfk->dump_lock); 323 return rc; 324 } 325 326 static inline void pfkey_hdr_dup(struct sadb_msg *new, 327 const struct sadb_msg *orig) 328 { 329 *new = *orig; 330 } 331 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 333 { 334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 335 struct sadb_msg *hdr; 336 337 if (!skb) 338 return -ENOBUFS; 339 340 /* Woe be to the platform trying to support PFKEY yet 341 * having normal errnos outside the 1-255 range, inclusive. 342 */ 343 err = -err; 344 if (err == ERESTARTSYS || 345 err == ERESTARTNOHAND || 346 err == ERESTARTNOINTR) 347 err = EINTR; 348 if (err >= 512) 349 err = EINVAL; 350 BUG_ON(err <= 0 || err >= 256); 351 352 hdr = skb_put(skb, sizeof(struct sadb_msg)); 353 pfkey_hdr_dup(hdr, orig); 354 hdr->sadb_msg_errno = (uint8_t) err; 355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 356 sizeof(uint64_t)); 357 358 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 359 360 return 0; 361 } 362 363 static const u8 sadb_ext_min_len[] = { 364 [SADB_EXT_RESERVED] = (u8) 0, 365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 391 }; 392 393 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 394 static int verify_address_len(const void *p) 395 { 396 const struct sadb_address *sp = p; 397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 398 const struct sockaddr_in *sin; 399 #if IS_ENABLED(CONFIG_IPV6) 400 const struct sockaddr_in6 *sin6; 401 #endif 402 int len; 403 404 if (sp->sadb_address_len < 405 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 406 sizeof(uint64_t))) 407 return -EINVAL; 408 409 switch (addr->sa_family) { 410 case AF_INET: 411 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 412 if (sp->sadb_address_len != len || 413 sp->sadb_address_prefixlen > 32) 414 return -EINVAL; 415 break; 416 #if IS_ENABLED(CONFIG_IPV6) 417 case AF_INET6: 418 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 419 if (sp->sadb_address_len != len || 420 sp->sadb_address_prefixlen > 128) 421 return -EINVAL; 422 break; 423 #endif 424 default: 425 /* It is user using kernel to keep track of security 426 * associations for another protocol, such as 427 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 428 * lengths. 429 * 430 * XXX Actually, association/policy database is not yet 431 * XXX able to cope with arbitrary sockaddr families. 432 * XXX When it can, remove this -EINVAL. -DaveM 433 */ 434 return -EINVAL; 435 } 436 437 return 0; 438 } 439 440 static inline int sadb_key_len(const struct sadb_key *key) 441 { 442 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 443 444 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 445 sizeof(uint64_t)); 446 } 447 448 static int verify_key_len(const void *p) 449 { 450 const struct sadb_key *key = p; 451 452 if (sadb_key_len(key) > key->sadb_key_len) 453 return -EINVAL; 454 455 return 0; 456 } 457 458 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 459 { 460 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 461 sec_ctx->sadb_x_ctx_len, 462 sizeof(uint64_t)); 463 } 464 465 static inline int verify_sec_ctx_len(const void *p) 466 { 467 const struct sadb_x_sec_ctx *sec_ctx = p; 468 int len = sec_ctx->sadb_x_ctx_len; 469 470 if (len > PAGE_SIZE) 471 return -EINVAL; 472 473 len = pfkey_sec_ctx_len(sec_ctx); 474 475 if (sec_ctx->sadb_x_sec_len != len) 476 return -EINVAL; 477 478 return 0; 479 } 480 481 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 482 gfp_t gfp) 483 { 484 struct xfrm_user_sec_ctx *uctx = NULL; 485 int ctx_size = sec_ctx->sadb_x_ctx_len; 486 487 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 488 489 if (!uctx) 490 return NULL; 491 492 uctx->len = pfkey_sec_ctx_len(sec_ctx); 493 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 494 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 495 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 496 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 497 memcpy(uctx + 1, sec_ctx + 1, 498 uctx->ctx_len); 499 500 return uctx; 501 } 502 503 static int present_and_same_family(const struct sadb_address *src, 504 const struct sadb_address *dst) 505 { 506 const struct sockaddr *s_addr, *d_addr; 507 508 if (!src || !dst) 509 return 0; 510 511 s_addr = (const struct sockaddr *)(src + 1); 512 d_addr = (const struct sockaddr *)(dst + 1); 513 if (s_addr->sa_family != d_addr->sa_family) 514 return 0; 515 if (s_addr->sa_family != AF_INET 516 #if IS_ENABLED(CONFIG_IPV6) 517 && s_addr->sa_family != AF_INET6 518 #endif 519 ) 520 return 0; 521 522 return 1; 523 } 524 525 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 526 { 527 const char *p = (char *) hdr; 528 int len = skb->len; 529 530 len -= sizeof(*hdr); 531 p += sizeof(*hdr); 532 while (len > 0) { 533 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 534 uint16_t ext_type; 535 int ext_len; 536 537 if (len < sizeof(*ehdr)) 538 return -EINVAL; 539 540 ext_len = ehdr->sadb_ext_len; 541 ext_len *= sizeof(uint64_t); 542 ext_type = ehdr->sadb_ext_type; 543 if (ext_len < sizeof(uint64_t) || 544 ext_len > len || 545 ext_type == SADB_EXT_RESERVED) 546 return -EINVAL; 547 548 if (ext_type <= SADB_EXT_MAX) { 549 int min = (int) sadb_ext_min_len[ext_type]; 550 if (ext_len < min) 551 return -EINVAL; 552 if (ext_hdrs[ext_type-1] != NULL) 553 return -EINVAL; 554 switch (ext_type) { 555 case SADB_EXT_ADDRESS_SRC: 556 case SADB_EXT_ADDRESS_DST: 557 case SADB_EXT_ADDRESS_PROXY: 558 case SADB_X_EXT_NAT_T_OA: 559 if (verify_address_len(p)) 560 return -EINVAL; 561 break; 562 case SADB_X_EXT_SEC_CTX: 563 if (verify_sec_ctx_len(p)) 564 return -EINVAL; 565 break; 566 case SADB_EXT_KEY_AUTH: 567 case SADB_EXT_KEY_ENCRYPT: 568 if (verify_key_len(p)) 569 return -EINVAL; 570 break; 571 default: 572 break; 573 } 574 ext_hdrs[ext_type-1] = (void *) p; 575 } 576 p += ext_len; 577 len -= ext_len; 578 } 579 580 return 0; 581 } 582 583 static uint16_t 584 pfkey_satype2proto(uint8_t satype) 585 { 586 switch (satype) { 587 case SADB_SATYPE_UNSPEC: 588 return IPSEC_PROTO_ANY; 589 case SADB_SATYPE_AH: 590 return IPPROTO_AH; 591 case SADB_SATYPE_ESP: 592 return IPPROTO_ESP; 593 case SADB_X_SATYPE_IPCOMP: 594 return IPPROTO_COMP; 595 default: 596 return 0; 597 } 598 /* NOTREACHED */ 599 } 600 601 static uint8_t 602 pfkey_proto2satype(uint16_t proto) 603 { 604 switch (proto) { 605 case IPPROTO_AH: 606 return SADB_SATYPE_AH; 607 case IPPROTO_ESP: 608 return SADB_SATYPE_ESP; 609 case IPPROTO_COMP: 610 return SADB_X_SATYPE_IPCOMP; 611 default: 612 return 0; 613 } 614 /* NOTREACHED */ 615 } 616 617 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 618 * say specifically 'just raw sockets' as we encode them as 255. 619 */ 620 621 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 622 { 623 return proto == IPSEC_PROTO_ANY ? 0 : proto; 624 } 625 626 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 627 { 628 return proto ? proto : IPSEC_PROTO_ANY; 629 } 630 631 static inline int pfkey_sockaddr_len(sa_family_t family) 632 { 633 switch (family) { 634 case AF_INET: 635 return sizeof(struct sockaddr_in); 636 #if IS_ENABLED(CONFIG_IPV6) 637 case AF_INET6: 638 return sizeof(struct sockaddr_in6); 639 #endif 640 } 641 return 0; 642 } 643 644 static 645 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 646 { 647 switch (sa->sa_family) { 648 case AF_INET: 649 xaddr->a4 = 650 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 651 return AF_INET; 652 #if IS_ENABLED(CONFIG_IPV6) 653 case AF_INET6: 654 memcpy(xaddr->a6, 655 &((struct sockaddr_in6 *)sa)->sin6_addr, 656 sizeof(struct in6_addr)); 657 return AF_INET6; 658 #endif 659 } 660 return 0; 661 } 662 663 static 664 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 665 { 666 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 667 xaddr); 668 } 669 670 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 671 { 672 const struct sadb_sa *sa; 673 const struct sadb_address *addr; 674 uint16_t proto; 675 unsigned short family; 676 xfrm_address_t *xaddr; 677 678 sa = ext_hdrs[SADB_EXT_SA - 1]; 679 if (sa == NULL) 680 return NULL; 681 682 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 683 if (proto == 0) 684 return NULL; 685 686 /* sadb_address_len should be checked by caller */ 687 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 688 if (addr == NULL) 689 return NULL; 690 691 family = ((const struct sockaddr *)(addr + 1))->sa_family; 692 switch (family) { 693 case AF_INET: 694 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 695 break; 696 #if IS_ENABLED(CONFIG_IPV6) 697 case AF_INET6: 698 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 699 break; 700 #endif 701 default: 702 xaddr = NULL; 703 } 704 705 if (!xaddr) 706 return NULL; 707 708 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 709 } 710 711 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 712 713 static int 714 pfkey_sockaddr_size(sa_family_t family) 715 { 716 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 717 } 718 719 static inline int pfkey_mode_from_xfrm(int mode) 720 { 721 switch(mode) { 722 case XFRM_MODE_TRANSPORT: 723 return IPSEC_MODE_TRANSPORT; 724 case XFRM_MODE_TUNNEL: 725 return IPSEC_MODE_TUNNEL; 726 case XFRM_MODE_BEET: 727 return IPSEC_MODE_BEET; 728 default: 729 return -1; 730 } 731 } 732 733 static inline int pfkey_mode_to_xfrm(int mode) 734 { 735 switch(mode) { 736 case IPSEC_MODE_ANY: /*XXX*/ 737 case IPSEC_MODE_TRANSPORT: 738 return XFRM_MODE_TRANSPORT; 739 case IPSEC_MODE_TUNNEL: 740 return XFRM_MODE_TUNNEL; 741 case IPSEC_MODE_BEET: 742 return XFRM_MODE_BEET; 743 default: 744 return -1; 745 } 746 } 747 748 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 749 struct sockaddr *sa, 750 unsigned short family) 751 { 752 switch (family) { 753 case AF_INET: 754 { 755 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 756 sin->sin_family = AF_INET; 757 sin->sin_port = port; 758 sin->sin_addr.s_addr = xaddr->a4; 759 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 760 return 32; 761 } 762 #if IS_ENABLED(CONFIG_IPV6) 763 case AF_INET6: 764 { 765 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 766 sin6->sin6_family = AF_INET6; 767 sin6->sin6_port = port; 768 sin6->sin6_flowinfo = 0; 769 sin6->sin6_addr = xaddr->in6; 770 sin6->sin6_scope_id = 0; 771 return 128; 772 } 773 #endif 774 } 775 return 0; 776 } 777 778 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 779 int add_keys, int hsc) 780 { 781 struct sk_buff *skb; 782 struct sadb_msg *hdr; 783 struct sadb_sa *sa; 784 struct sadb_lifetime *lifetime; 785 struct sadb_address *addr; 786 struct sadb_key *key; 787 struct sadb_x_sa2 *sa2; 788 struct sadb_x_sec_ctx *sec_ctx; 789 struct xfrm_sec_ctx *xfrm_ctx; 790 int ctx_size = 0; 791 int size; 792 int auth_key_size = 0; 793 int encrypt_key_size = 0; 794 int sockaddr_size; 795 struct xfrm_encap_tmpl *natt = NULL; 796 int mode; 797 798 /* address family check */ 799 sockaddr_size = pfkey_sockaddr_size(x->props.family); 800 if (!sockaddr_size) 801 return ERR_PTR(-EINVAL); 802 803 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 804 key(AE), (identity(SD),) (sensitivity)> */ 805 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 806 sizeof(struct sadb_lifetime) + 807 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 808 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 809 sizeof(struct sadb_address)*2 + 810 sockaddr_size*2 + 811 sizeof(struct sadb_x_sa2); 812 813 if ((xfrm_ctx = x->security)) { 814 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 815 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 816 } 817 818 /* identity & sensitivity */ 819 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 820 size += sizeof(struct sadb_address) + sockaddr_size; 821 822 if (add_keys) { 823 if (x->aalg && x->aalg->alg_key_len) { 824 auth_key_size = 825 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 826 size += sizeof(struct sadb_key) + auth_key_size; 827 } 828 if (x->ealg && x->ealg->alg_key_len) { 829 encrypt_key_size = 830 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 831 size += sizeof(struct sadb_key) + encrypt_key_size; 832 } 833 } 834 if (x->encap) 835 natt = x->encap; 836 837 if (natt && natt->encap_type) { 838 size += sizeof(struct sadb_x_nat_t_type); 839 size += sizeof(struct sadb_x_nat_t_port); 840 size += sizeof(struct sadb_x_nat_t_port); 841 } 842 843 skb = alloc_skb(size + 16, GFP_ATOMIC); 844 if (skb == NULL) 845 return ERR_PTR(-ENOBUFS); 846 847 /* call should fill header later */ 848 hdr = skb_put(skb, sizeof(struct sadb_msg)); 849 memset(hdr, 0, size); /* XXX do we need this ? */ 850 hdr->sadb_msg_len = size / sizeof(uint64_t); 851 852 /* sa */ 853 sa = skb_put(skb, sizeof(struct sadb_sa)); 854 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 855 sa->sadb_sa_exttype = SADB_EXT_SA; 856 sa->sadb_sa_spi = x->id.spi; 857 sa->sadb_sa_replay = x->props.replay_window; 858 switch (x->km.state) { 859 case XFRM_STATE_VALID: 860 sa->sadb_sa_state = x->km.dying ? 861 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 862 break; 863 case XFRM_STATE_ACQ: 864 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 865 break; 866 default: 867 sa->sadb_sa_state = SADB_SASTATE_DEAD; 868 break; 869 } 870 sa->sadb_sa_auth = 0; 871 if (x->aalg) { 872 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 873 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 874 a->desc.sadb_alg_id : 0; 875 } 876 sa->sadb_sa_encrypt = 0; 877 BUG_ON(x->ealg && x->calg); 878 if (x->ealg) { 879 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 880 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 881 a->desc.sadb_alg_id : 0; 882 } 883 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 884 if (x->calg) { 885 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 886 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 887 a->desc.sadb_alg_id : 0; 888 } 889 890 sa->sadb_sa_flags = 0; 891 if (x->props.flags & XFRM_STATE_NOECN) 892 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 893 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 894 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 895 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 896 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 897 898 /* hard time */ 899 if (hsc & 2) { 900 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 901 lifetime->sadb_lifetime_len = 902 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 903 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 904 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 905 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 906 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 907 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 908 } 909 /* soft time */ 910 if (hsc & 1) { 911 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 912 lifetime->sadb_lifetime_len = 913 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 914 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 915 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 916 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 917 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 918 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 919 } 920 /* current time */ 921 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 922 lifetime->sadb_lifetime_len = 923 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 924 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 925 lifetime->sadb_lifetime_allocations = x->curlft.packets; 926 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 927 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 928 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 929 /* src 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_SRC; 935 /* "if the ports are non-zero, then the sadb_address_proto field, 936 normally zero, MUST be filled in with the transport 937 protocol's number." - RFC2367 */ 938 addr->sadb_address_proto = 0; 939 addr->sadb_address_reserved = 0; 940 941 addr->sadb_address_prefixlen = 942 pfkey_sockaddr_fill(&x->props.saddr, 0, 943 (struct sockaddr *) (addr + 1), 944 x->props.family); 945 if (!addr->sadb_address_prefixlen) 946 BUG(); 947 948 /* dst address */ 949 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 950 addr->sadb_address_len = 951 (sizeof(struct sadb_address)+sockaddr_size)/ 952 sizeof(uint64_t); 953 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 954 addr->sadb_address_proto = 0; 955 addr->sadb_address_reserved = 0; 956 957 addr->sadb_address_prefixlen = 958 pfkey_sockaddr_fill(&x->id.daddr, 0, 959 (struct sockaddr *) (addr + 1), 960 x->props.family); 961 if (!addr->sadb_address_prefixlen) 962 BUG(); 963 964 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 965 x->props.family)) { 966 addr = skb_put(skb, 967 sizeof(struct sadb_address) + sockaddr_size); 968 addr->sadb_address_len = 969 (sizeof(struct sadb_address)+sockaddr_size)/ 970 sizeof(uint64_t); 971 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 972 addr->sadb_address_proto = 973 pfkey_proto_from_xfrm(x->sel.proto); 974 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 975 addr->sadb_address_reserved = 0; 976 977 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 978 (struct sockaddr *) (addr + 1), 979 x->props.family); 980 } 981 982 /* auth key */ 983 if (add_keys && auth_key_size) { 984 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 985 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 986 sizeof(uint64_t); 987 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 988 key->sadb_key_bits = x->aalg->alg_key_len; 989 key->sadb_key_reserved = 0; 990 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 991 } 992 /* encrypt key */ 993 if (add_keys && encrypt_key_size) { 994 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 995 key->sadb_key_len = (sizeof(struct sadb_key) + 996 encrypt_key_size) / sizeof(uint64_t); 997 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 998 key->sadb_key_bits = x->ealg->alg_key_len; 999 key->sadb_key_reserved = 0; 1000 memcpy(key + 1, x->ealg->alg_key, 1001 (x->ealg->alg_key_len+7)/8); 1002 } 1003 1004 /* sa */ 1005 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 1006 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 1007 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 1008 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 1009 kfree_skb(skb); 1010 return ERR_PTR(-EINVAL); 1011 } 1012 sa2->sadb_x_sa2_mode = mode; 1013 sa2->sadb_x_sa2_reserved1 = 0; 1014 sa2->sadb_x_sa2_reserved2 = 0; 1015 sa2->sadb_x_sa2_sequence = 0; 1016 sa2->sadb_x_sa2_reqid = x->props.reqid; 1017 1018 if (natt && natt->encap_type) { 1019 struct sadb_x_nat_t_type *n_type; 1020 struct sadb_x_nat_t_port *n_port; 1021 1022 /* type */ 1023 n_type = skb_put(skb, sizeof(*n_type)); 1024 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1025 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1026 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1027 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1028 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1029 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1030 1031 /* source port */ 1032 n_port = skb_put(skb, sizeof(*n_port)); 1033 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1034 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1035 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1036 n_port->sadb_x_nat_t_port_reserved = 0; 1037 1038 /* dest port */ 1039 n_port = skb_put(skb, sizeof(*n_port)); 1040 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1041 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1042 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1043 n_port->sadb_x_nat_t_port_reserved = 0; 1044 } 1045 1046 /* security context */ 1047 if (xfrm_ctx) { 1048 sec_ctx = skb_put(skb, 1049 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1050 sec_ctx->sadb_x_sec_len = 1051 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1052 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1053 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1054 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1055 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1056 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1057 xfrm_ctx->ctx_len); 1058 } 1059 1060 return skb; 1061 } 1062 1063 1064 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1065 { 1066 struct sk_buff *skb; 1067 1068 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1069 1070 return skb; 1071 } 1072 1073 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1074 int hsc) 1075 { 1076 return __pfkey_xfrm_state2msg(x, 0, hsc); 1077 } 1078 1079 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1080 const struct sadb_msg *hdr, 1081 void * const *ext_hdrs) 1082 { 1083 struct xfrm_state *x; 1084 const struct sadb_lifetime *lifetime; 1085 const struct sadb_sa *sa; 1086 const struct sadb_key *key; 1087 const struct sadb_x_sec_ctx *sec_ctx; 1088 uint16_t proto; 1089 int err; 1090 1091 1092 sa = ext_hdrs[SADB_EXT_SA - 1]; 1093 if (!sa || 1094 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1095 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1096 return ERR_PTR(-EINVAL); 1097 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1098 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1099 return ERR_PTR(-EINVAL); 1100 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1101 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1102 return ERR_PTR(-EINVAL); 1103 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1104 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1105 return ERR_PTR(-EINVAL); 1106 1107 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1108 if (proto == 0) 1109 return ERR_PTR(-EINVAL); 1110 1111 /* default error is no buffer space */ 1112 err = -ENOBUFS; 1113 1114 /* RFC2367: 1115 1116 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1117 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1118 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1119 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1120 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1121 not true. 1122 1123 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1124 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1125 */ 1126 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1127 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1128 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1129 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1130 return ERR_PTR(-EINVAL); 1131 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1132 if (key != NULL && 1133 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1134 key->sadb_key_bits == 0) 1135 return ERR_PTR(-EINVAL); 1136 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1137 if (key != NULL && 1138 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1139 key->sadb_key_bits == 0) 1140 return ERR_PTR(-EINVAL); 1141 1142 x = xfrm_state_alloc(net); 1143 if (x == NULL) 1144 return ERR_PTR(-ENOBUFS); 1145 1146 x->id.proto = proto; 1147 x->id.spi = sa->sadb_sa_spi; 1148 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1149 (sizeof(x->replay.bitmap) * 8)); 1150 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1151 x->props.flags |= XFRM_STATE_NOECN; 1152 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1153 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1154 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1155 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1156 1157 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1158 if (lifetime != NULL) { 1159 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1160 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1161 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1162 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1163 } 1164 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1165 if (lifetime != NULL) { 1166 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1167 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1168 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1169 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1170 } 1171 1172 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1173 if (sec_ctx != NULL) { 1174 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1175 1176 if (!uctx) 1177 goto out; 1178 1179 err = security_xfrm_state_alloc(x, uctx); 1180 kfree(uctx); 1181 1182 if (err) 1183 goto out; 1184 } 1185 1186 err = -ENOBUFS; 1187 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1188 if (sa->sadb_sa_auth) { 1189 int keysize = 0; 1190 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1191 if (!a || !a->pfkey_supported) { 1192 err = -ENOSYS; 1193 goto out; 1194 } 1195 if (key) 1196 keysize = (key->sadb_key_bits + 7) / 8; 1197 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1198 if (!x->aalg) { 1199 err = -ENOMEM; 1200 goto out; 1201 } 1202 strcpy(x->aalg->alg_name, a->name); 1203 x->aalg->alg_key_len = 0; 1204 if (key) { 1205 x->aalg->alg_key_len = key->sadb_key_bits; 1206 memcpy(x->aalg->alg_key, key+1, keysize); 1207 } 1208 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1209 x->props.aalgo = sa->sadb_sa_auth; 1210 /* x->algo.flags = sa->sadb_sa_flags; */ 1211 } 1212 if (sa->sadb_sa_encrypt) { 1213 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1214 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1215 if (!a || !a->pfkey_supported) { 1216 err = -ENOSYS; 1217 goto out; 1218 } 1219 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1220 if (!x->calg) { 1221 err = -ENOMEM; 1222 goto out; 1223 } 1224 strcpy(x->calg->alg_name, a->name); 1225 x->props.calgo = sa->sadb_sa_encrypt; 1226 } else { 1227 int keysize = 0; 1228 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1229 if (!a || !a->pfkey_supported) { 1230 err = -ENOSYS; 1231 goto out; 1232 } 1233 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1234 if (key) 1235 keysize = (key->sadb_key_bits + 7) / 8; 1236 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1237 if (!x->ealg) { 1238 err = -ENOMEM; 1239 goto out; 1240 } 1241 strcpy(x->ealg->alg_name, a->name); 1242 x->ealg->alg_key_len = 0; 1243 if (key) { 1244 x->ealg->alg_key_len = key->sadb_key_bits; 1245 memcpy(x->ealg->alg_key, key+1, keysize); 1246 } 1247 x->props.ealgo = sa->sadb_sa_encrypt; 1248 x->geniv = a->uinfo.encr.geniv; 1249 } 1250 } 1251 /* x->algo.flags = sa->sadb_sa_flags; */ 1252 1253 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1254 &x->props.saddr); 1255 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1256 &x->id.daddr); 1257 1258 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1259 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1260 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1261 if (mode < 0) { 1262 err = -EINVAL; 1263 goto out; 1264 } 1265 x->props.mode = mode; 1266 x->props.reqid = sa2->sadb_x_sa2_reqid; 1267 } 1268 1269 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1270 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1271 1272 /* Nobody uses this, but we try. */ 1273 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1274 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1275 } 1276 1277 if (!x->sel.family) 1278 x->sel.family = x->props.family; 1279 1280 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1281 const struct sadb_x_nat_t_type* n_type; 1282 struct xfrm_encap_tmpl *natt; 1283 1284 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1285 if (!x->encap) { 1286 err = -ENOMEM; 1287 goto out; 1288 } 1289 1290 natt = x->encap; 1291 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1292 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1293 1294 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1295 const struct sadb_x_nat_t_port *n_port = 1296 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1297 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1298 } 1299 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1300 const struct sadb_x_nat_t_port *n_port = 1301 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1302 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1303 } 1304 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1305 } 1306 1307 err = xfrm_init_state(x); 1308 if (err) 1309 goto out; 1310 1311 x->km.seq = hdr->sadb_msg_seq; 1312 return x; 1313 1314 out: 1315 x->km.state = XFRM_STATE_DEAD; 1316 xfrm_state_put(x); 1317 return ERR_PTR(err); 1318 } 1319 1320 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1321 { 1322 return -EOPNOTSUPP; 1323 } 1324 1325 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1326 { 1327 struct net *net = sock_net(sk); 1328 struct sk_buff *resp_skb; 1329 struct sadb_x_sa2 *sa2; 1330 struct sadb_address *saddr, *daddr; 1331 struct sadb_msg *out_hdr; 1332 struct sadb_spirange *range; 1333 struct xfrm_state *x = NULL; 1334 int mode; 1335 int err; 1336 u32 min_spi, max_spi; 1337 u32 reqid; 1338 u8 proto; 1339 unsigned short family; 1340 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1341 1342 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1343 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1344 return -EINVAL; 1345 1346 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1347 if (proto == 0) 1348 return -EINVAL; 1349 1350 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1351 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1352 if (mode < 0) 1353 return -EINVAL; 1354 reqid = sa2->sadb_x_sa2_reqid; 1355 } else { 1356 mode = 0; 1357 reqid = 0; 1358 } 1359 1360 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1361 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1362 1363 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1364 switch (family) { 1365 case AF_INET: 1366 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1367 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1368 break; 1369 #if IS_ENABLED(CONFIG_IPV6) 1370 case AF_INET6: 1371 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1372 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1373 break; 1374 #endif 1375 } 1376 1377 if (hdr->sadb_msg_seq) { 1378 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1379 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1380 xfrm_state_put(x); 1381 x = NULL; 1382 } 1383 } 1384 1385 if (!x) 1386 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1387 1388 if (x == NULL) 1389 return -ENOENT; 1390 1391 min_spi = 0x100; 1392 max_spi = 0x0fffffff; 1393 1394 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1395 if (range) { 1396 min_spi = range->sadb_spirange_min; 1397 max_spi = range->sadb_spirange_max; 1398 } 1399 1400 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1401 if (err) { 1402 xfrm_state_put(x); 1403 return err; 1404 } 1405 1406 err = xfrm_alloc_spi(x, min_spi, max_spi); 1407 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1408 1409 if (IS_ERR(resp_skb)) { 1410 xfrm_state_put(x); 1411 return PTR_ERR(resp_skb); 1412 } 1413 1414 out_hdr = (struct sadb_msg *) resp_skb->data; 1415 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1416 out_hdr->sadb_msg_type = SADB_GETSPI; 1417 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1418 out_hdr->sadb_msg_errno = 0; 1419 out_hdr->sadb_msg_reserved = 0; 1420 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1421 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1422 1423 xfrm_state_put(x); 1424 1425 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1426 1427 return 0; 1428 } 1429 1430 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1431 { 1432 struct net *net = sock_net(sk); 1433 struct xfrm_state *x; 1434 1435 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1436 return -EOPNOTSUPP; 1437 1438 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1439 return 0; 1440 1441 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1442 if (x == NULL) 1443 return 0; 1444 1445 spin_lock_bh(&x->lock); 1446 if (x->km.state == XFRM_STATE_ACQ) 1447 x->km.state = XFRM_STATE_ERROR; 1448 1449 spin_unlock_bh(&x->lock); 1450 xfrm_state_put(x); 1451 return 0; 1452 } 1453 1454 static inline int event2poltype(int event) 1455 { 1456 switch (event) { 1457 case XFRM_MSG_DELPOLICY: 1458 return SADB_X_SPDDELETE; 1459 case XFRM_MSG_NEWPOLICY: 1460 return SADB_X_SPDADD; 1461 case XFRM_MSG_UPDPOLICY: 1462 return SADB_X_SPDUPDATE; 1463 case XFRM_MSG_POLEXPIRE: 1464 // return SADB_X_SPDEXPIRE; 1465 default: 1466 pr_err("pfkey: Unknown policy event %d\n", event); 1467 break; 1468 } 1469 1470 return 0; 1471 } 1472 1473 static inline int event2keytype(int event) 1474 { 1475 switch (event) { 1476 case XFRM_MSG_DELSA: 1477 return SADB_DELETE; 1478 case XFRM_MSG_NEWSA: 1479 return SADB_ADD; 1480 case XFRM_MSG_UPDSA: 1481 return SADB_UPDATE; 1482 case XFRM_MSG_EXPIRE: 1483 return SADB_EXPIRE; 1484 default: 1485 pr_err("pfkey: Unknown SA event %d\n", event); 1486 break; 1487 } 1488 1489 return 0; 1490 } 1491 1492 /* ADD/UPD/DEL */ 1493 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1494 { 1495 struct sk_buff *skb; 1496 struct sadb_msg *hdr; 1497 1498 skb = pfkey_xfrm_state2msg(x); 1499 1500 if (IS_ERR(skb)) 1501 return PTR_ERR(skb); 1502 1503 hdr = (struct sadb_msg *) skb->data; 1504 hdr->sadb_msg_version = PF_KEY_V2; 1505 hdr->sadb_msg_type = event2keytype(c->event); 1506 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1507 hdr->sadb_msg_errno = 0; 1508 hdr->sadb_msg_reserved = 0; 1509 hdr->sadb_msg_seq = c->seq; 1510 hdr->sadb_msg_pid = c->portid; 1511 1512 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1513 1514 return 0; 1515 } 1516 1517 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1518 { 1519 struct net *net = sock_net(sk); 1520 struct xfrm_state *x; 1521 int err; 1522 struct km_event c; 1523 1524 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1525 if (IS_ERR(x)) 1526 return PTR_ERR(x); 1527 1528 xfrm_state_hold(x); 1529 if (hdr->sadb_msg_type == SADB_ADD) 1530 err = xfrm_state_add(x); 1531 else 1532 err = xfrm_state_update(x); 1533 1534 xfrm_audit_state_add(x, err ? 0 : 1, true); 1535 1536 if (err < 0) { 1537 x->km.state = XFRM_STATE_DEAD; 1538 __xfrm_state_put(x); 1539 goto out; 1540 } 1541 1542 if (hdr->sadb_msg_type == SADB_ADD) 1543 c.event = XFRM_MSG_NEWSA; 1544 else 1545 c.event = XFRM_MSG_UPDSA; 1546 c.seq = hdr->sadb_msg_seq; 1547 c.portid = hdr->sadb_msg_pid; 1548 km_state_notify(x, &c); 1549 out: 1550 xfrm_state_put(x); 1551 return err; 1552 } 1553 1554 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1555 { 1556 struct net *net = sock_net(sk); 1557 struct xfrm_state *x; 1558 struct km_event c; 1559 int err; 1560 1561 if (!ext_hdrs[SADB_EXT_SA-1] || 1562 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1563 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1564 return -EINVAL; 1565 1566 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1567 if (x == NULL) 1568 return -ESRCH; 1569 1570 if ((err = security_xfrm_state_delete(x))) 1571 goto out; 1572 1573 if (xfrm_state_kern(x)) { 1574 err = -EPERM; 1575 goto out; 1576 } 1577 1578 err = xfrm_state_delete(x); 1579 1580 if (err < 0) 1581 goto out; 1582 1583 c.seq = hdr->sadb_msg_seq; 1584 c.portid = hdr->sadb_msg_pid; 1585 c.event = XFRM_MSG_DELSA; 1586 km_state_notify(x, &c); 1587 out: 1588 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1589 xfrm_state_put(x); 1590 1591 return err; 1592 } 1593 1594 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1595 { 1596 struct net *net = sock_net(sk); 1597 __u8 proto; 1598 struct sk_buff *out_skb; 1599 struct sadb_msg *out_hdr; 1600 struct xfrm_state *x; 1601 1602 if (!ext_hdrs[SADB_EXT_SA-1] || 1603 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1604 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1605 return -EINVAL; 1606 1607 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1608 if (x == NULL) 1609 return -ESRCH; 1610 1611 out_skb = pfkey_xfrm_state2msg(x); 1612 proto = x->id.proto; 1613 xfrm_state_put(x); 1614 if (IS_ERR(out_skb)) 1615 return PTR_ERR(out_skb); 1616 1617 out_hdr = (struct sadb_msg *) out_skb->data; 1618 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1619 out_hdr->sadb_msg_type = SADB_GET; 1620 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1621 out_hdr->sadb_msg_errno = 0; 1622 out_hdr->sadb_msg_reserved = 0; 1623 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1624 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1625 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1626 1627 return 0; 1628 } 1629 1630 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1631 gfp_t allocation) 1632 { 1633 struct sk_buff *skb; 1634 struct sadb_msg *hdr; 1635 int len, auth_len, enc_len, i; 1636 1637 auth_len = xfrm_count_pfkey_auth_supported(); 1638 if (auth_len) { 1639 auth_len *= sizeof(struct sadb_alg); 1640 auth_len += sizeof(struct sadb_supported); 1641 } 1642 1643 enc_len = xfrm_count_pfkey_enc_supported(); 1644 if (enc_len) { 1645 enc_len *= sizeof(struct sadb_alg); 1646 enc_len += sizeof(struct sadb_supported); 1647 } 1648 1649 len = enc_len + auth_len + sizeof(struct sadb_msg); 1650 1651 skb = alloc_skb(len + 16, allocation); 1652 if (!skb) 1653 goto out_put_algs; 1654 1655 hdr = skb_put(skb, sizeof(*hdr)); 1656 pfkey_hdr_dup(hdr, orig); 1657 hdr->sadb_msg_errno = 0; 1658 hdr->sadb_msg_len = len / sizeof(uint64_t); 1659 1660 if (auth_len) { 1661 struct sadb_supported *sp; 1662 struct sadb_alg *ap; 1663 1664 sp = skb_put(skb, auth_len); 1665 ap = (struct sadb_alg *) (sp + 1); 1666 1667 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1668 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1669 1670 for (i = 0; ; i++) { 1671 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1672 if (!aalg) 1673 break; 1674 if (!aalg->pfkey_supported) 1675 continue; 1676 if (aalg->available) 1677 *ap++ = aalg->desc; 1678 } 1679 } 1680 1681 if (enc_len) { 1682 struct sadb_supported *sp; 1683 struct sadb_alg *ap; 1684 1685 sp = skb_put(skb, enc_len); 1686 ap = (struct sadb_alg *) (sp + 1); 1687 1688 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1689 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1690 1691 for (i = 0; ; i++) { 1692 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1693 if (!ealg) 1694 break; 1695 if (!ealg->pfkey_supported) 1696 continue; 1697 if (ealg->available) 1698 *ap++ = ealg->desc; 1699 } 1700 } 1701 1702 out_put_algs: 1703 return skb; 1704 } 1705 1706 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1707 { 1708 struct pfkey_sock *pfk = pfkey_sk(sk); 1709 struct sk_buff *supp_skb; 1710 1711 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1712 return -EINVAL; 1713 1714 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1715 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1716 return -EEXIST; 1717 pfk->registered |= (1<<hdr->sadb_msg_satype); 1718 } 1719 1720 xfrm_probe_algs(); 1721 1722 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1723 if (!supp_skb) { 1724 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1725 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1726 1727 return -ENOBUFS; 1728 } 1729 1730 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1731 sock_net(sk)); 1732 return 0; 1733 } 1734 1735 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 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 1744 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1745 hdr->sadb_msg_errno = (uint8_t) 0; 1746 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1747 1748 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1749 sock_net(sk)); 1750 } 1751 1752 static int key_notify_sa_flush(const struct km_event *c) 1753 { 1754 struct sk_buff *skb; 1755 struct sadb_msg *hdr; 1756 1757 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1758 if (!skb) 1759 return -ENOBUFS; 1760 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1761 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1762 hdr->sadb_msg_type = SADB_FLUSH; 1763 hdr->sadb_msg_seq = c->seq; 1764 hdr->sadb_msg_pid = c->portid; 1765 hdr->sadb_msg_version = PF_KEY_V2; 1766 hdr->sadb_msg_errno = (uint8_t) 0; 1767 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1768 hdr->sadb_msg_reserved = 0; 1769 1770 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1771 1772 return 0; 1773 } 1774 1775 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1776 { 1777 struct net *net = sock_net(sk); 1778 unsigned int proto; 1779 struct km_event c; 1780 int err, err2; 1781 1782 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1783 if (proto == 0) 1784 return -EINVAL; 1785 1786 err = xfrm_state_flush(net, proto, true); 1787 err2 = unicast_flush_resp(sk, hdr); 1788 if (err || err2) { 1789 if (err == -ESRCH) /* empty table - go quietly */ 1790 err = 0; 1791 return err ? err : err2; 1792 } 1793 1794 c.data.proto = proto; 1795 c.seq = hdr->sadb_msg_seq; 1796 c.portid = hdr->sadb_msg_pid; 1797 c.event = XFRM_MSG_FLUSHSA; 1798 c.net = net; 1799 km_state_notify(NULL, &c); 1800 1801 return 0; 1802 } 1803 1804 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1805 { 1806 struct pfkey_sock *pfk = ptr; 1807 struct sk_buff *out_skb; 1808 struct sadb_msg *out_hdr; 1809 1810 if (!pfkey_can_dump(&pfk->sk)) 1811 return -ENOBUFS; 1812 1813 out_skb = pfkey_xfrm_state2msg(x); 1814 if (IS_ERR(out_skb)) 1815 return PTR_ERR(out_skb); 1816 1817 out_hdr = (struct sadb_msg *) out_skb->data; 1818 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1819 out_hdr->sadb_msg_type = SADB_DUMP; 1820 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1821 out_hdr->sadb_msg_errno = 0; 1822 out_hdr->sadb_msg_reserved = 0; 1823 out_hdr->sadb_msg_seq = count + 1; 1824 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1825 1826 if (pfk->dump.skb) 1827 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1828 &pfk->sk, sock_net(&pfk->sk)); 1829 pfk->dump.skb = out_skb; 1830 1831 return 0; 1832 } 1833 1834 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1835 { 1836 struct net *net = sock_net(&pfk->sk); 1837 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1838 } 1839 1840 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1841 { 1842 struct net *net = sock_net(&pfk->sk); 1843 1844 xfrm_state_walk_done(&pfk->dump.u.state, net); 1845 } 1846 1847 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1848 { 1849 u8 proto; 1850 struct xfrm_address_filter *filter = NULL; 1851 struct pfkey_sock *pfk = pfkey_sk(sk); 1852 1853 mutex_lock(&pfk->dump_lock); 1854 if (pfk->dump.dump != NULL) { 1855 mutex_unlock(&pfk->dump_lock); 1856 return -EBUSY; 1857 } 1858 1859 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1860 if (proto == 0) { 1861 mutex_unlock(&pfk->dump_lock); 1862 return -EINVAL; 1863 } 1864 1865 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1866 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1867 1868 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1869 if (filter == NULL) { 1870 mutex_unlock(&pfk->dump_lock); 1871 return -ENOMEM; 1872 } 1873 1874 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1875 sizeof(xfrm_address_t)); 1876 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1877 sizeof(xfrm_address_t)); 1878 filter->family = xfilter->sadb_x_filter_family; 1879 filter->splen = xfilter->sadb_x_filter_splen; 1880 filter->dplen = xfilter->sadb_x_filter_dplen; 1881 } 1882 1883 pfk->dump.msg_version = hdr->sadb_msg_version; 1884 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1885 pfk->dump.dump = pfkey_dump_sa; 1886 pfk->dump.done = pfkey_dump_sa_done; 1887 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1888 mutex_unlock(&pfk->dump_lock); 1889 1890 return pfkey_do_dump(pfk); 1891 } 1892 1893 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1894 { 1895 struct pfkey_sock *pfk = pfkey_sk(sk); 1896 int satype = hdr->sadb_msg_satype; 1897 bool reset_errno = false; 1898 1899 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1900 reset_errno = true; 1901 if (satype != 0 && satype != 1) 1902 return -EINVAL; 1903 pfk->promisc = satype; 1904 } 1905 if (reset_errno && skb_cloned(skb)) 1906 skb = skb_copy(skb, GFP_KERNEL); 1907 else 1908 skb = skb_clone(skb, GFP_KERNEL); 1909 1910 if (reset_errno && skb) { 1911 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1912 new_hdr->sadb_msg_errno = 0; 1913 } 1914 1915 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1916 return 0; 1917 } 1918 1919 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1920 { 1921 int i; 1922 u32 reqid = *(u32*)ptr; 1923 1924 for (i=0; i<xp->xfrm_nr; i++) { 1925 if (xp->xfrm_vec[i].reqid == reqid) 1926 return -EEXIST; 1927 } 1928 return 0; 1929 } 1930 1931 static u32 gen_reqid(struct net *net) 1932 { 1933 struct xfrm_policy_walk walk; 1934 u32 start; 1935 int rc; 1936 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1937 1938 start = reqid; 1939 do { 1940 ++reqid; 1941 if (reqid == 0) 1942 reqid = IPSEC_MANUAL_REQID_MAX+1; 1943 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1944 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1945 xfrm_policy_walk_done(&walk, net); 1946 if (rc != -EEXIST) 1947 return reqid; 1948 } while (reqid != start); 1949 return 0; 1950 } 1951 1952 static int 1953 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1954 { 1955 struct net *net = xp_net(xp); 1956 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1957 int mode; 1958 1959 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1960 return -ELOOP; 1961 1962 if (rq->sadb_x_ipsecrequest_mode == 0) 1963 return -EINVAL; 1964 1965 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1966 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1967 return -EINVAL; 1968 t->mode = mode; 1969 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1970 t->optional = 1; 1971 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1972 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1973 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1974 t->reqid = 0; 1975 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1976 return -ENOBUFS; 1977 } 1978 1979 /* addresses present only in tunnel mode */ 1980 if (t->mode == XFRM_MODE_TUNNEL) { 1981 int err; 1982 1983 err = parse_sockaddr_pair( 1984 (struct sockaddr *)(rq + 1), 1985 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1986 &t->saddr, &t->id.daddr, &t->encap_family); 1987 if (err) 1988 return err; 1989 } else 1990 t->encap_family = xp->family; 1991 1992 /* No way to set this via kame pfkey */ 1993 t->allalgs = 1; 1994 xp->xfrm_nr++; 1995 return 0; 1996 } 1997 1998 static int 1999 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 2000 { 2001 int err; 2002 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 2003 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 2004 2005 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 2006 return -EINVAL; 2007 2008 while (len >= sizeof(*rq)) { 2009 if (len < rq->sadb_x_ipsecrequest_len || 2010 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2011 return -EINVAL; 2012 2013 if ((err = parse_ipsecrequest(xp, rq)) < 0) 2014 return err; 2015 len -= rq->sadb_x_ipsecrequest_len; 2016 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2017 } 2018 return 0; 2019 } 2020 2021 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2022 { 2023 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2024 2025 if (xfrm_ctx) { 2026 int len = sizeof(struct sadb_x_sec_ctx); 2027 len += xfrm_ctx->ctx_len; 2028 return PFKEY_ALIGN8(len); 2029 } 2030 return 0; 2031 } 2032 2033 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2034 { 2035 const struct xfrm_tmpl *t; 2036 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2037 int socklen = 0; 2038 int i; 2039 2040 for (i=0; i<xp->xfrm_nr; i++) { 2041 t = xp->xfrm_vec + i; 2042 socklen += pfkey_sockaddr_len(t->encap_family); 2043 } 2044 2045 return sizeof(struct sadb_msg) + 2046 (sizeof(struct sadb_lifetime) * 3) + 2047 (sizeof(struct sadb_address) * 2) + 2048 (sockaddr_size * 2) + 2049 sizeof(struct sadb_x_policy) + 2050 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2051 (socklen * 2) + 2052 pfkey_xfrm_policy2sec_ctx_size(xp); 2053 } 2054 2055 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2056 { 2057 struct sk_buff *skb; 2058 int size; 2059 2060 size = pfkey_xfrm_policy2msg_size(xp); 2061 2062 skb = alloc_skb(size + 16, GFP_ATOMIC); 2063 if (skb == NULL) 2064 return ERR_PTR(-ENOBUFS); 2065 2066 return skb; 2067 } 2068 2069 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2070 { 2071 struct sadb_msg *hdr; 2072 struct sadb_address *addr; 2073 struct sadb_lifetime *lifetime; 2074 struct sadb_x_policy *pol; 2075 struct sadb_x_sec_ctx *sec_ctx; 2076 struct xfrm_sec_ctx *xfrm_ctx; 2077 int i; 2078 int size; 2079 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2080 int socklen = pfkey_sockaddr_len(xp->family); 2081 2082 size = pfkey_xfrm_policy2msg_size(xp); 2083 2084 /* call should fill header later */ 2085 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2086 memset(hdr, 0, size); /* XXX do we need this ? */ 2087 2088 /* src address */ 2089 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2090 addr->sadb_address_len = 2091 (sizeof(struct sadb_address)+sockaddr_size)/ 2092 sizeof(uint64_t); 2093 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2094 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2095 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2096 addr->sadb_address_reserved = 0; 2097 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2098 xp->selector.sport, 2099 (struct sockaddr *) (addr + 1), 2100 xp->family)) 2101 BUG(); 2102 2103 /* dst address */ 2104 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2105 addr->sadb_address_len = 2106 (sizeof(struct sadb_address)+sockaddr_size)/ 2107 sizeof(uint64_t); 2108 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2109 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2110 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2111 addr->sadb_address_reserved = 0; 2112 2113 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2114 (struct sockaddr *) (addr + 1), 2115 xp->family); 2116 2117 /* hard time */ 2118 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2119 lifetime->sadb_lifetime_len = 2120 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2121 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2122 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2123 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2124 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2125 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2126 /* soft time */ 2127 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2128 lifetime->sadb_lifetime_len = 2129 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2130 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2131 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2132 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2133 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2134 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2135 /* current time */ 2136 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2137 lifetime->sadb_lifetime_len = 2138 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2139 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2140 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2141 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2142 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2143 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2144 2145 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2146 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2147 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2148 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2149 if (xp->action == XFRM_POLICY_ALLOW) { 2150 if (xp->xfrm_nr) 2151 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2152 else 2153 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2154 } 2155 pol->sadb_x_policy_dir = dir+1; 2156 pol->sadb_x_policy_reserved = 0; 2157 pol->sadb_x_policy_id = xp->index; 2158 pol->sadb_x_policy_priority = xp->priority; 2159 2160 for (i=0; i<xp->xfrm_nr; i++) { 2161 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2162 struct sadb_x_ipsecrequest *rq; 2163 int req_size; 2164 int mode; 2165 2166 req_size = sizeof(struct sadb_x_ipsecrequest); 2167 if (t->mode == XFRM_MODE_TUNNEL) { 2168 socklen = pfkey_sockaddr_len(t->encap_family); 2169 req_size += socklen * 2; 2170 } else { 2171 size -= 2*socklen; 2172 } 2173 rq = skb_put(skb, req_size); 2174 pol->sadb_x_policy_len += req_size/8; 2175 memset(rq, 0, sizeof(*rq)); 2176 rq->sadb_x_ipsecrequest_len = req_size; 2177 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2178 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2179 return -EINVAL; 2180 rq->sadb_x_ipsecrequest_mode = mode; 2181 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2182 if (t->reqid) 2183 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2184 if (t->optional) 2185 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2186 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2187 2188 if (t->mode == XFRM_MODE_TUNNEL) { 2189 u8 *sa = (void *)(rq + 1); 2190 pfkey_sockaddr_fill(&t->saddr, 0, 2191 (struct sockaddr *)sa, 2192 t->encap_family); 2193 pfkey_sockaddr_fill(&t->id.daddr, 0, 2194 (struct sockaddr *) (sa + socklen), 2195 t->encap_family); 2196 } 2197 } 2198 2199 /* security context */ 2200 if ((xfrm_ctx = xp->security)) { 2201 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2202 2203 sec_ctx = skb_put(skb, ctx_size); 2204 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2205 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2206 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2207 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2208 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2209 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2210 xfrm_ctx->ctx_len); 2211 } 2212 2213 hdr->sadb_msg_len = size / sizeof(uint64_t); 2214 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2215 2216 return 0; 2217 } 2218 2219 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2220 { 2221 struct sk_buff *out_skb; 2222 struct sadb_msg *out_hdr; 2223 int err; 2224 2225 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2226 if (IS_ERR(out_skb)) 2227 return PTR_ERR(out_skb); 2228 2229 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2230 if (err < 0) { 2231 kfree_skb(out_skb); 2232 return err; 2233 } 2234 2235 out_hdr = (struct sadb_msg *) out_skb->data; 2236 out_hdr->sadb_msg_version = PF_KEY_V2; 2237 2238 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2239 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2240 else 2241 out_hdr->sadb_msg_type = event2poltype(c->event); 2242 out_hdr->sadb_msg_errno = 0; 2243 out_hdr->sadb_msg_seq = c->seq; 2244 out_hdr->sadb_msg_pid = c->portid; 2245 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2246 return 0; 2247 2248 } 2249 2250 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2251 { 2252 struct net *net = sock_net(sk); 2253 int err = 0; 2254 struct sadb_lifetime *lifetime; 2255 struct sadb_address *sa; 2256 struct sadb_x_policy *pol; 2257 struct xfrm_policy *xp; 2258 struct km_event c; 2259 struct sadb_x_sec_ctx *sec_ctx; 2260 2261 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2262 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2263 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2264 return -EINVAL; 2265 2266 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2267 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2268 return -EINVAL; 2269 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2270 return -EINVAL; 2271 2272 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2273 if (xp == NULL) 2274 return -ENOBUFS; 2275 2276 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2277 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2278 xp->priority = pol->sadb_x_policy_priority; 2279 2280 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2281 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2282 xp->selector.family = xp->family; 2283 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2284 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2285 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2286 if (xp->selector.sport) 2287 xp->selector.sport_mask = htons(0xffff); 2288 2289 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2290 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2291 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2292 2293 /* Amusing, we set this twice. KAME apps appear to set same value 2294 * in both addresses. 2295 */ 2296 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2297 2298 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2299 if (xp->selector.dport) 2300 xp->selector.dport_mask = htons(0xffff); 2301 2302 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2303 if (sec_ctx != NULL) { 2304 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2305 2306 if (!uctx) { 2307 err = -ENOBUFS; 2308 goto out; 2309 } 2310 2311 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2312 kfree(uctx); 2313 2314 if (err) 2315 goto out; 2316 } 2317 2318 xp->lft.soft_byte_limit = XFRM_INF; 2319 xp->lft.hard_byte_limit = XFRM_INF; 2320 xp->lft.soft_packet_limit = XFRM_INF; 2321 xp->lft.hard_packet_limit = XFRM_INF; 2322 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2323 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2324 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2325 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2326 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2327 } 2328 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2329 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2330 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2331 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2332 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2333 } 2334 xp->xfrm_nr = 0; 2335 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2336 (err = parse_ipsecrequests(xp, pol)) < 0) 2337 goto out; 2338 2339 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2340 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2341 2342 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2343 2344 if (err) 2345 goto out; 2346 2347 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2348 c.event = XFRM_MSG_UPDPOLICY; 2349 else 2350 c.event = XFRM_MSG_NEWPOLICY; 2351 2352 c.seq = hdr->sadb_msg_seq; 2353 c.portid = hdr->sadb_msg_pid; 2354 2355 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2356 xfrm_pol_put(xp); 2357 return 0; 2358 2359 out: 2360 xp->walk.dead = 1; 2361 xfrm_policy_destroy(xp); 2362 return err; 2363 } 2364 2365 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2366 { 2367 struct net *net = sock_net(sk); 2368 int err; 2369 struct sadb_address *sa; 2370 struct sadb_x_policy *pol; 2371 struct xfrm_policy *xp; 2372 struct xfrm_selector sel; 2373 struct km_event c; 2374 struct sadb_x_sec_ctx *sec_ctx; 2375 struct xfrm_sec_ctx *pol_ctx = NULL; 2376 2377 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2378 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2379 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2380 return -EINVAL; 2381 2382 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2383 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2384 return -EINVAL; 2385 2386 memset(&sel, 0, sizeof(sel)); 2387 2388 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2389 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2390 sel.prefixlen_s = sa->sadb_address_prefixlen; 2391 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2392 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2393 if (sel.sport) 2394 sel.sport_mask = htons(0xffff); 2395 2396 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2397 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2398 sel.prefixlen_d = sa->sadb_address_prefixlen; 2399 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2400 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2401 if (sel.dport) 2402 sel.dport_mask = htons(0xffff); 2403 2404 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2405 if (sec_ctx != NULL) { 2406 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2407 2408 if (!uctx) 2409 return -ENOMEM; 2410 2411 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2412 kfree(uctx); 2413 if (err) 2414 return err; 2415 } 2416 2417 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2418 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2419 1, &err); 2420 security_xfrm_policy_free(pol_ctx); 2421 if (xp == NULL) 2422 return -ENOENT; 2423 2424 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2425 2426 if (err) 2427 goto out; 2428 2429 c.seq = hdr->sadb_msg_seq; 2430 c.portid = hdr->sadb_msg_pid; 2431 c.data.byid = 0; 2432 c.event = XFRM_MSG_DELPOLICY; 2433 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2434 2435 out: 2436 xfrm_pol_put(xp); 2437 return err; 2438 } 2439 2440 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2441 { 2442 int err; 2443 struct sk_buff *out_skb; 2444 struct sadb_msg *out_hdr; 2445 err = 0; 2446 2447 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2448 if (IS_ERR(out_skb)) { 2449 err = PTR_ERR(out_skb); 2450 goto out; 2451 } 2452 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2453 if (err < 0) 2454 goto out; 2455 2456 out_hdr = (struct sadb_msg *) out_skb->data; 2457 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2458 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2459 out_hdr->sadb_msg_satype = 0; 2460 out_hdr->sadb_msg_errno = 0; 2461 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2462 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2463 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2464 err = 0; 2465 2466 out: 2467 return err; 2468 } 2469 2470 static int pfkey_sockaddr_pair_size(sa_family_t family) 2471 { 2472 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2473 } 2474 2475 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2476 xfrm_address_t *saddr, xfrm_address_t *daddr, 2477 u16 *family) 2478 { 2479 int af, socklen; 2480 2481 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2482 return -EINVAL; 2483 2484 af = pfkey_sockaddr_extract(sa, saddr); 2485 if (!af) 2486 return -EINVAL; 2487 2488 socklen = pfkey_sockaddr_len(af); 2489 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2490 daddr) != af) 2491 return -EINVAL; 2492 2493 *family = af; 2494 return 0; 2495 } 2496 2497 #ifdef CONFIG_NET_KEY_MIGRATE 2498 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2499 struct xfrm_migrate *m) 2500 { 2501 int err; 2502 struct sadb_x_ipsecrequest *rq2; 2503 int mode; 2504 2505 if (len < sizeof(*rq1) || 2506 len < rq1->sadb_x_ipsecrequest_len || 2507 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2508 return -EINVAL; 2509 2510 /* old endoints */ 2511 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2512 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2513 &m->old_saddr, &m->old_daddr, 2514 &m->old_family); 2515 if (err) 2516 return err; 2517 2518 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2519 len -= rq1->sadb_x_ipsecrequest_len; 2520 2521 if (len <= sizeof(*rq2) || 2522 len < rq2->sadb_x_ipsecrequest_len || 2523 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2524 return -EINVAL; 2525 2526 /* new endpoints */ 2527 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2528 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2529 &m->new_saddr, &m->new_daddr, 2530 &m->new_family); 2531 if (err) 2532 return err; 2533 2534 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2535 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2536 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2537 return -EINVAL; 2538 2539 m->proto = rq1->sadb_x_ipsecrequest_proto; 2540 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2541 return -EINVAL; 2542 m->mode = mode; 2543 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2544 2545 return ((int)(rq1->sadb_x_ipsecrequest_len + 2546 rq2->sadb_x_ipsecrequest_len)); 2547 } 2548 2549 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2550 const struct sadb_msg *hdr, void * const *ext_hdrs) 2551 { 2552 int i, len, ret, err = -EINVAL; 2553 u8 dir; 2554 struct sadb_address *sa; 2555 struct sadb_x_kmaddress *kma; 2556 struct sadb_x_policy *pol; 2557 struct sadb_x_ipsecrequest *rq; 2558 struct xfrm_selector sel; 2559 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2560 struct xfrm_kmaddress k; 2561 struct net *net = sock_net(sk); 2562 2563 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2564 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2565 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2566 err = -EINVAL; 2567 goto out; 2568 } 2569 2570 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2571 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2572 2573 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2574 err = -EINVAL; 2575 goto out; 2576 } 2577 2578 if (kma) { 2579 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2580 k.reserved = kma->sadb_x_kmaddress_reserved; 2581 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2582 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2583 &k.local, &k.remote, &k.family); 2584 if (ret < 0) { 2585 err = ret; 2586 goto out; 2587 } 2588 } 2589 2590 dir = pol->sadb_x_policy_dir - 1; 2591 memset(&sel, 0, sizeof(sel)); 2592 2593 /* set source address info of selector */ 2594 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2595 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2596 sel.prefixlen_s = sa->sadb_address_prefixlen; 2597 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2598 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2599 if (sel.sport) 2600 sel.sport_mask = htons(0xffff); 2601 2602 /* set destination address info of selector */ 2603 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2604 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2605 sel.prefixlen_d = sa->sadb_address_prefixlen; 2606 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2607 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2608 if (sel.dport) 2609 sel.dport_mask = htons(0xffff); 2610 2611 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2612 2613 /* extract ipsecrequests */ 2614 i = 0; 2615 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2616 2617 while (len > 0 && i < XFRM_MAX_DEPTH) { 2618 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2619 if (ret < 0) { 2620 err = ret; 2621 goto out; 2622 } else { 2623 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2624 len -= ret; 2625 i++; 2626 } 2627 } 2628 2629 if (!i || len > 0) { 2630 err = -EINVAL; 2631 goto out; 2632 } 2633 2634 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2635 kma ? &k : NULL, net, NULL); 2636 2637 out: 2638 return err; 2639 } 2640 #else 2641 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2642 const struct sadb_msg *hdr, void * const *ext_hdrs) 2643 { 2644 return -ENOPROTOOPT; 2645 } 2646 #endif 2647 2648 2649 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2650 { 2651 struct net *net = sock_net(sk); 2652 unsigned int dir; 2653 int err = 0, delete; 2654 struct sadb_x_policy *pol; 2655 struct xfrm_policy *xp; 2656 struct km_event c; 2657 2658 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2659 return -EINVAL; 2660 2661 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2662 if (dir >= XFRM_POLICY_MAX) 2663 return -EINVAL; 2664 2665 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2666 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2667 dir, pol->sadb_x_policy_id, delete, &err); 2668 if (xp == NULL) 2669 return -ENOENT; 2670 2671 if (delete) { 2672 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2673 2674 if (err) 2675 goto out; 2676 c.seq = hdr->sadb_msg_seq; 2677 c.portid = hdr->sadb_msg_pid; 2678 c.data.byid = 1; 2679 c.event = XFRM_MSG_DELPOLICY; 2680 km_policy_notify(xp, dir, &c); 2681 } else { 2682 err = key_pol_get_resp(sk, xp, hdr, dir); 2683 } 2684 2685 out: 2686 xfrm_pol_put(xp); 2687 return err; 2688 } 2689 2690 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2691 { 2692 struct pfkey_sock *pfk = ptr; 2693 struct sk_buff *out_skb; 2694 struct sadb_msg *out_hdr; 2695 int err; 2696 2697 if (!pfkey_can_dump(&pfk->sk)) 2698 return -ENOBUFS; 2699 2700 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2701 if (IS_ERR(out_skb)) 2702 return PTR_ERR(out_skb); 2703 2704 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2705 if (err < 0) 2706 return err; 2707 2708 out_hdr = (struct sadb_msg *) out_skb->data; 2709 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2710 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2711 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2712 out_hdr->sadb_msg_errno = 0; 2713 out_hdr->sadb_msg_seq = count + 1; 2714 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2715 2716 if (pfk->dump.skb) 2717 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2718 &pfk->sk, sock_net(&pfk->sk)); 2719 pfk->dump.skb = out_skb; 2720 2721 return 0; 2722 } 2723 2724 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2725 { 2726 struct net *net = sock_net(&pfk->sk); 2727 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2728 } 2729 2730 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2731 { 2732 struct net *net = sock_net((struct sock *)pfk); 2733 2734 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2735 } 2736 2737 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2738 { 2739 struct pfkey_sock *pfk = pfkey_sk(sk); 2740 2741 mutex_lock(&pfk->dump_lock); 2742 if (pfk->dump.dump != NULL) { 2743 mutex_unlock(&pfk->dump_lock); 2744 return -EBUSY; 2745 } 2746 2747 pfk->dump.msg_version = hdr->sadb_msg_version; 2748 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2749 pfk->dump.dump = pfkey_dump_sp; 2750 pfk->dump.done = pfkey_dump_sp_done; 2751 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2752 mutex_unlock(&pfk->dump_lock); 2753 2754 return pfkey_do_dump(pfk); 2755 } 2756 2757 static int key_notify_policy_flush(const struct km_event *c) 2758 { 2759 struct sk_buff *skb_out; 2760 struct sadb_msg *hdr; 2761 2762 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2763 if (!skb_out) 2764 return -ENOBUFS; 2765 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2766 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2767 hdr->sadb_msg_seq = c->seq; 2768 hdr->sadb_msg_pid = c->portid; 2769 hdr->sadb_msg_version = PF_KEY_V2; 2770 hdr->sadb_msg_errno = (uint8_t) 0; 2771 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2772 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2773 hdr->sadb_msg_reserved = 0; 2774 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2775 return 0; 2776 2777 } 2778 2779 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2780 { 2781 struct net *net = sock_net(sk); 2782 struct km_event c; 2783 int err, err2; 2784 2785 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2786 err2 = unicast_flush_resp(sk, hdr); 2787 if (err || err2) { 2788 if (err == -ESRCH) /* empty table - old silent behavior */ 2789 return 0; 2790 return err; 2791 } 2792 2793 c.data.type = XFRM_POLICY_TYPE_MAIN; 2794 c.event = XFRM_MSG_FLUSHPOLICY; 2795 c.portid = hdr->sadb_msg_pid; 2796 c.seq = hdr->sadb_msg_seq; 2797 c.net = net; 2798 km_policy_notify(NULL, 0, &c); 2799 2800 return 0; 2801 } 2802 2803 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2804 const struct sadb_msg *hdr, void * const *ext_hdrs); 2805 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2806 [SADB_RESERVED] = pfkey_reserved, 2807 [SADB_GETSPI] = pfkey_getspi, 2808 [SADB_UPDATE] = pfkey_add, 2809 [SADB_ADD] = pfkey_add, 2810 [SADB_DELETE] = pfkey_delete, 2811 [SADB_GET] = pfkey_get, 2812 [SADB_ACQUIRE] = pfkey_acquire, 2813 [SADB_REGISTER] = pfkey_register, 2814 [SADB_EXPIRE] = NULL, 2815 [SADB_FLUSH] = pfkey_flush, 2816 [SADB_DUMP] = pfkey_dump, 2817 [SADB_X_PROMISC] = pfkey_promisc, 2818 [SADB_X_PCHANGE] = NULL, 2819 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2820 [SADB_X_SPDADD] = pfkey_spdadd, 2821 [SADB_X_SPDDELETE] = pfkey_spddelete, 2822 [SADB_X_SPDGET] = pfkey_spdget, 2823 [SADB_X_SPDACQUIRE] = NULL, 2824 [SADB_X_SPDDUMP] = pfkey_spddump, 2825 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2826 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2827 [SADB_X_SPDDELETE2] = pfkey_spdget, 2828 [SADB_X_MIGRATE] = pfkey_migrate, 2829 }; 2830 2831 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2832 { 2833 void *ext_hdrs[SADB_EXT_MAX]; 2834 int err; 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) && aalg->available) 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) && ealg->available)) 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) && aalg->available) 2938 sz += sizeof(struct sadb_comb); 2939 } 2940 } 2941 return sz + sizeof(struct sadb_prop); 2942 } 2943 2944 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2945 { 2946 struct sadb_prop *p; 2947 int i; 2948 2949 p = skb_put(skb, sizeof(struct sadb_prop)); 2950 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2951 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2952 p->sadb_prop_replay = 32; 2953 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2954 2955 for (i = 0; ; i++) { 2956 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2957 if (!aalg) 2958 break; 2959 2960 if (!aalg->pfkey_supported) 2961 continue; 2962 2963 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2964 struct sadb_comb *c; 2965 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2966 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2967 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2968 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2969 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2970 c->sadb_comb_hard_addtime = 24*60*60; 2971 c->sadb_comb_soft_addtime = 20*60*60; 2972 c->sadb_comb_hard_usetime = 8*60*60; 2973 c->sadb_comb_soft_usetime = 7*60*60; 2974 } 2975 } 2976 } 2977 2978 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2979 { 2980 struct sadb_prop *p; 2981 int i, k; 2982 2983 p = skb_put(skb, sizeof(struct sadb_prop)); 2984 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2985 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2986 p->sadb_prop_replay = 32; 2987 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2988 2989 for (i=0; ; i++) { 2990 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2991 if (!ealg) 2992 break; 2993 2994 if (!ealg->pfkey_supported) 2995 continue; 2996 2997 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2998 continue; 2999 3000 for (k = 1; ; k++) { 3001 struct sadb_comb *c; 3002 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3003 if (!aalg) 3004 break; 3005 if (!aalg->pfkey_supported) 3006 continue; 3007 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3008 continue; 3009 c = skb_put(skb, sizeof(struct sadb_comb)); 3010 memset(c, 0, sizeof(*c)); 3011 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3012 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3013 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3014 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3015 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3016 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3017 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3018 c->sadb_comb_hard_addtime = 24*60*60; 3019 c->sadb_comb_soft_addtime = 20*60*60; 3020 c->sadb_comb_hard_usetime = 8*60*60; 3021 c->sadb_comb_soft_usetime = 7*60*60; 3022 } 3023 } 3024 } 3025 3026 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3027 { 3028 return 0; 3029 } 3030 3031 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3032 { 3033 struct sk_buff *out_skb; 3034 struct sadb_msg *out_hdr; 3035 int hard; 3036 int hsc; 3037 3038 hard = c->data.hard; 3039 if (hard) 3040 hsc = 2; 3041 else 3042 hsc = 1; 3043 3044 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3045 if (IS_ERR(out_skb)) 3046 return PTR_ERR(out_skb); 3047 3048 out_hdr = (struct sadb_msg *) out_skb->data; 3049 out_hdr->sadb_msg_version = PF_KEY_V2; 3050 out_hdr->sadb_msg_type = SADB_EXPIRE; 3051 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3052 out_hdr->sadb_msg_errno = 0; 3053 out_hdr->sadb_msg_reserved = 0; 3054 out_hdr->sadb_msg_seq = 0; 3055 out_hdr->sadb_msg_pid = 0; 3056 3057 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3058 xs_net(x)); 3059 return 0; 3060 } 3061 3062 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3063 { 3064 struct net *net = x ? xs_net(x) : c->net; 3065 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3066 3067 if (atomic_read(&net_pfkey->socks_nr) == 0) 3068 return 0; 3069 3070 switch (c->event) { 3071 case XFRM_MSG_EXPIRE: 3072 return key_notify_sa_expire(x, c); 3073 case XFRM_MSG_DELSA: 3074 case XFRM_MSG_NEWSA: 3075 case XFRM_MSG_UPDSA: 3076 return key_notify_sa(x, c); 3077 case XFRM_MSG_FLUSHSA: 3078 return key_notify_sa_flush(c); 3079 case XFRM_MSG_NEWAE: /* not yet supported */ 3080 break; 3081 default: 3082 pr_err("pfkey: Unknown SA event %d\n", c->event); 3083 break; 3084 } 3085 3086 return 0; 3087 } 3088 3089 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3090 { 3091 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3092 return 0; 3093 3094 switch (c->event) { 3095 case XFRM_MSG_POLEXPIRE: 3096 return key_notify_policy_expire(xp, c); 3097 case XFRM_MSG_DELPOLICY: 3098 case XFRM_MSG_NEWPOLICY: 3099 case XFRM_MSG_UPDPOLICY: 3100 return key_notify_policy(xp, dir, c); 3101 case XFRM_MSG_FLUSHPOLICY: 3102 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3103 break; 3104 return key_notify_policy_flush(c); 3105 default: 3106 pr_err("pfkey: Unknown policy event %d\n", c->event); 3107 break; 3108 } 3109 3110 return 0; 3111 } 3112 3113 static u32 get_acqseq(void) 3114 { 3115 u32 res; 3116 static atomic_t acqseq; 3117 3118 do { 3119 res = atomic_inc_return(&acqseq); 3120 } while (!res); 3121 return res; 3122 } 3123 3124 static bool pfkey_is_alive(const struct km_event *c) 3125 { 3126 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3127 struct sock *sk; 3128 bool is_alive = false; 3129 3130 rcu_read_lock(); 3131 sk_for_each_rcu(sk, &net_pfkey->table) { 3132 if (pfkey_sk(sk)->registered) { 3133 is_alive = true; 3134 break; 3135 } 3136 } 3137 rcu_read_unlock(); 3138 3139 return is_alive; 3140 } 3141 3142 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3143 { 3144 struct sk_buff *skb; 3145 struct sadb_msg *hdr; 3146 struct sadb_address *addr; 3147 struct sadb_x_policy *pol; 3148 int sockaddr_size; 3149 int size; 3150 struct sadb_x_sec_ctx *sec_ctx; 3151 struct xfrm_sec_ctx *xfrm_ctx; 3152 int ctx_size = 0; 3153 3154 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3155 if (!sockaddr_size) 3156 return -EINVAL; 3157 3158 size = sizeof(struct sadb_msg) + 3159 (sizeof(struct sadb_address) * 2) + 3160 (sockaddr_size * 2) + 3161 sizeof(struct sadb_x_policy); 3162 3163 if (x->id.proto == IPPROTO_AH) 3164 size += count_ah_combs(t); 3165 else if (x->id.proto == IPPROTO_ESP) 3166 size += count_esp_combs(t); 3167 3168 if ((xfrm_ctx = x->security)) { 3169 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3170 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3171 } 3172 3173 skb = alloc_skb(size + 16, GFP_ATOMIC); 3174 if (skb == NULL) 3175 return -ENOMEM; 3176 3177 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3178 hdr->sadb_msg_version = PF_KEY_V2; 3179 hdr->sadb_msg_type = SADB_ACQUIRE; 3180 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3181 hdr->sadb_msg_len = size / sizeof(uint64_t); 3182 hdr->sadb_msg_errno = 0; 3183 hdr->sadb_msg_reserved = 0; 3184 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3185 hdr->sadb_msg_pid = 0; 3186 3187 /* src address */ 3188 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3189 addr->sadb_address_len = 3190 (sizeof(struct sadb_address)+sockaddr_size)/ 3191 sizeof(uint64_t); 3192 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3193 addr->sadb_address_proto = 0; 3194 addr->sadb_address_reserved = 0; 3195 addr->sadb_address_prefixlen = 3196 pfkey_sockaddr_fill(&x->props.saddr, 0, 3197 (struct sockaddr *) (addr + 1), 3198 x->props.family); 3199 if (!addr->sadb_address_prefixlen) 3200 BUG(); 3201 3202 /* dst address */ 3203 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3204 addr->sadb_address_len = 3205 (sizeof(struct sadb_address)+sockaddr_size)/ 3206 sizeof(uint64_t); 3207 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3208 addr->sadb_address_proto = 0; 3209 addr->sadb_address_reserved = 0; 3210 addr->sadb_address_prefixlen = 3211 pfkey_sockaddr_fill(&x->id.daddr, 0, 3212 (struct sockaddr *) (addr + 1), 3213 x->props.family); 3214 if (!addr->sadb_address_prefixlen) 3215 BUG(); 3216 3217 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3218 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3219 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3220 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3221 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3222 pol->sadb_x_policy_reserved = 0; 3223 pol->sadb_x_policy_id = xp->index; 3224 pol->sadb_x_policy_priority = xp->priority; 3225 3226 /* Set sadb_comb's. */ 3227 if (x->id.proto == IPPROTO_AH) 3228 dump_ah_combs(skb, t); 3229 else if (x->id.proto == IPPROTO_ESP) 3230 dump_esp_combs(skb, t); 3231 3232 /* security context */ 3233 if (xfrm_ctx) { 3234 sec_ctx = skb_put(skb, 3235 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3236 sec_ctx->sadb_x_sec_len = 3237 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3238 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3239 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3240 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3241 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3242 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3243 xfrm_ctx->ctx_len); 3244 } 3245 3246 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3247 xs_net(x)); 3248 } 3249 3250 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3251 u8 *data, int len, int *dir) 3252 { 3253 struct net *net = sock_net(sk); 3254 struct xfrm_policy *xp; 3255 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3256 struct sadb_x_sec_ctx *sec_ctx; 3257 3258 switch (sk->sk_family) { 3259 case AF_INET: 3260 if (opt != IP_IPSEC_POLICY) { 3261 *dir = -EOPNOTSUPP; 3262 return NULL; 3263 } 3264 break; 3265 #if IS_ENABLED(CONFIG_IPV6) 3266 case AF_INET6: 3267 if (opt != IPV6_IPSEC_POLICY) { 3268 *dir = -EOPNOTSUPP; 3269 return NULL; 3270 } 3271 break; 3272 #endif 3273 default: 3274 *dir = -EINVAL; 3275 return NULL; 3276 } 3277 3278 *dir = -EINVAL; 3279 3280 if (len < sizeof(struct sadb_x_policy) || 3281 pol->sadb_x_policy_len*8 > len || 3282 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3283 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3284 return NULL; 3285 3286 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3287 if (xp == NULL) { 3288 *dir = -ENOBUFS; 3289 return NULL; 3290 } 3291 3292 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3293 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3294 3295 xp->lft.soft_byte_limit = XFRM_INF; 3296 xp->lft.hard_byte_limit = XFRM_INF; 3297 xp->lft.soft_packet_limit = XFRM_INF; 3298 xp->lft.hard_packet_limit = XFRM_INF; 3299 xp->family = sk->sk_family; 3300 3301 xp->xfrm_nr = 0; 3302 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3303 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3304 goto out; 3305 3306 /* security context too */ 3307 if (len >= (pol->sadb_x_policy_len*8 + 3308 sizeof(struct sadb_x_sec_ctx))) { 3309 char *p = (char *)pol; 3310 struct xfrm_user_sec_ctx *uctx; 3311 3312 p += pol->sadb_x_policy_len*8; 3313 sec_ctx = (struct sadb_x_sec_ctx *)p; 3314 if (len < pol->sadb_x_policy_len*8 + 3315 sec_ctx->sadb_x_sec_len*8) { 3316 *dir = -EINVAL; 3317 goto out; 3318 } 3319 if ((*dir = verify_sec_ctx_len(p))) 3320 goto out; 3321 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3322 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3323 kfree(uctx); 3324 3325 if (*dir) 3326 goto out; 3327 } 3328 3329 *dir = pol->sadb_x_policy_dir-1; 3330 return xp; 3331 3332 out: 3333 xp->walk.dead = 1; 3334 xfrm_policy_destroy(xp); 3335 return NULL; 3336 } 3337 3338 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3339 { 3340 struct sk_buff *skb; 3341 struct sadb_msg *hdr; 3342 struct sadb_sa *sa; 3343 struct sadb_address *addr; 3344 struct sadb_x_nat_t_port *n_port; 3345 int sockaddr_size; 3346 int size; 3347 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3348 struct xfrm_encap_tmpl *natt = NULL; 3349 3350 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3351 if (!sockaddr_size) 3352 return -EINVAL; 3353 3354 if (!satype) 3355 return -EINVAL; 3356 3357 if (!x->encap) 3358 return -EINVAL; 3359 3360 natt = x->encap; 3361 3362 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3363 * 3364 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3365 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3366 */ 3367 3368 size = sizeof(struct sadb_msg) + 3369 sizeof(struct sadb_sa) + 3370 (sizeof(struct sadb_address) * 2) + 3371 (sockaddr_size * 2) + 3372 (sizeof(struct sadb_x_nat_t_port) * 2); 3373 3374 skb = alloc_skb(size + 16, GFP_ATOMIC); 3375 if (skb == NULL) 3376 return -ENOMEM; 3377 3378 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3379 hdr->sadb_msg_version = PF_KEY_V2; 3380 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3381 hdr->sadb_msg_satype = satype; 3382 hdr->sadb_msg_len = size / sizeof(uint64_t); 3383 hdr->sadb_msg_errno = 0; 3384 hdr->sadb_msg_reserved = 0; 3385 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3386 hdr->sadb_msg_pid = 0; 3387 3388 /* SA */ 3389 sa = skb_put(skb, sizeof(struct sadb_sa)); 3390 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3391 sa->sadb_sa_exttype = SADB_EXT_SA; 3392 sa->sadb_sa_spi = x->id.spi; 3393 sa->sadb_sa_replay = 0; 3394 sa->sadb_sa_state = 0; 3395 sa->sadb_sa_auth = 0; 3396 sa->sadb_sa_encrypt = 0; 3397 sa->sadb_sa_flags = 0; 3398 3399 /* ADDRESS_SRC (old addr) */ 3400 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3401 addr->sadb_address_len = 3402 (sizeof(struct sadb_address)+sockaddr_size)/ 3403 sizeof(uint64_t); 3404 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3405 addr->sadb_address_proto = 0; 3406 addr->sadb_address_reserved = 0; 3407 addr->sadb_address_prefixlen = 3408 pfkey_sockaddr_fill(&x->props.saddr, 0, 3409 (struct sockaddr *) (addr + 1), 3410 x->props.family); 3411 if (!addr->sadb_address_prefixlen) 3412 BUG(); 3413 3414 /* NAT_T_SPORT (old port) */ 3415 n_port = skb_put(skb, sizeof(*n_port)); 3416 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3417 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3418 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3419 n_port->sadb_x_nat_t_port_reserved = 0; 3420 3421 /* ADDRESS_DST (new addr) */ 3422 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3423 addr->sadb_address_len = 3424 (sizeof(struct sadb_address)+sockaddr_size)/ 3425 sizeof(uint64_t); 3426 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3427 addr->sadb_address_proto = 0; 3428 addr->sadb_address_reserved = 0; 3429 addr->sadb_address_prefixlen = 3430 pfkey_sockaddr_fill(ipaddr, 0, 3431 (struct sockaddr *) (addr + 1), 3432 x->props.family); 3433 if (!addr->sadb_address_prefixlen) 3434 BUG(); 3435 3436 /* NAT_T_DPORT (new port) */ 3437 n_port = skb_put(skb, sizeof(*n_port)); 3438 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3439 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3440 n_port->sadb_x_nat_t_port_port = sport; 3441 n_port->sadb_x_nat_t_port_reserved = 0; 3442 3443 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3444 xs_net(x)); 3445 } 3446 3447 #ifdef CONFIG_NET_KEY_MIGRATE 3448 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3449 const struct xfrm_selector *sel) 3450 { 3451 struct sadb_address *addr; 3452 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3453 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3454 addr->sadb_address_exttype = type; 3455 addr->sadb_address_proto = sel->proto; 3456 addr->sadb_address_reserved = 0; 3457 3458 switch (type) { 3459 case SADB_EXT_ADDRESS_SRC: 3460 addr->sadb_address_prefixlen = sel->prefixlen_s; 3461 pfkey_sockaddr_fill(&sel->saddr, 0, 3462 (struct sockaddr *)(addr + 1), 3463 sel->family); 3464 break; 3465 case SADB_EXT_ADDRESS_DST: 3466 addr->sadb_address_prefixlen = sel->prefixlen_d; 3467 pfkey_sockaddr_fill(&sel->daddr, 0, 3468 (struct sockaddr *)(addr + 1), 3469 sel->family); 3470 break; 3471 default: 3472 return -EINVAL; 3473 } 3474 3475 return 0; 3476 } 3477 3478 3479 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3480 { 3481 struct sadb_x_kmaddress *kma; 3482 u8 *sa; 3483 int family = k->family; 3484 int socklen = pfkey_sockaddr_len(family); 3485 int size_req; 3486 3487 size_req = (sizeof(struct sadb_x_kmaddress) + 3488 pfkey_sockaddr_pair_size(family)); 3489 3490 kma = skb_put_zero(skb, size_req); 3491 kma->sadb_x_kmaddress_len = size_req / 8; 3492 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3493 kma->sadb_x_kmaddress_reserved = k->reserved; 3494 3495 sa = (u8 *)(kma + 1); 3496 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3497 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3498 return -EINVAL; 3499 3500 return 0; 3501 } 3502 3503 static int set_ipsecrequest(struct sk_buff *skb, 3504 uint8_t proto, uint8_t mode, int level, 3505 uint32_t reqid, uint8_t family, 3506 const xfrm_address_t *src, const xfrm_address_t *dst) 3507 { 3508 struct sadb_x_ipsecrequest *rq; 3509 u8 *sa; 3510 int socklen = pfkey_sockaddr_len(family); 3511 int size_req; 3512 3513 size_req = sizeof(struct sadb_x_ipsecrequest) + 3514 pfkey_sockaddr_pair_size(family); 3515 3516 rq = skb_put_zero(skb, size_req); 3517 rq->sadb_x_ipsecrequest_len = size_req; 3518 rq->sadb_x_ipsecrequest_proto = proto; 3519 rq->sadb_x_ipsecrequest_mode = mode; 3520 rq->sadb_x_ipsecrequest_level = level; 3521 rq->sadb_x_ipsecrequest_reqid = reqid; 3522 3523 sa = (u8 *) (rq + 1); 3524 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3525 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3526 return -EINVAL; 3527 3528 return 0; 3529 } 3530 #endif 3531 3532 #ifdef CONFIG_NET_KEY_MIGRATE 3533 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3534 const struct xfrm_migrate *m, int num_bundles, 3535 const struct xfrm_kmaddress *k, 3536 const struct xfrm_encap_tmpl *encap) 3537 { 3538 int i; 3539 int sasize_sel; 3540 int size = 0; 3541 int size_pol = 0; 3542 struct sk_buff *skb; 3543 struct sadb_msg *hdr; 3544 struct sadb_x_policy *pol; 3545 const struct xfrm_migrate *mp; 3546 3547 if (type != XFRM_POLICY_TYPE_MAIN) 3548 return 0; 3549 3550 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3551 return -EINVAL; 3552 3553 if (k != NULL) { 3554 /* addresses for KM */ 3555 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3556 pfkey_sockaddr_pair_size(k->family)); 3557 } 3558 3559 /* selector */ 3560 sasize_sel = pfkey_sockaddr_size(sel->family); 3561 if (!sasize_sel) 3562 return -EINVAL; 3563 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3564 3565 /* policy info */ 3566 size_pol += sizeof(struct sadb_x_policy); 3567 3568 /* ipsecrequests */ 3569 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3570 /* old locator pair */ 3571 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3572 pfkey_sockaddr_pair_size(mp->old_family); 3573 /* new locator pair */ 3574 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3575 pfkey_sockaddr_pair_size(mp->new_family); 3576 } 3577 3578 size += sizeof(struct sadb_msg) + size_pol; 3579 3580 /* alloc buffer */ 3581 skb = alloc_skb(size, GFP_ATOMIC); 3582 if (skb == NULL) 3583 return -ENOMEM; 3584 3585 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3586 hdr->sadb_msg_version = PF_KEY_V2; 3587 hdr->sadb_msg_type = SADB_X_MIGRATE; 3588 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3589 hdr->sadb_msg_len = size / 8; 3590 hdr->sadb_msg_errno = 0; 3591 hdr->sadb_msg_reserved = 0; 3592 hdr->sadb_msg_seq = 0; 3593 hdr->sadb_msg_pid = 0; 3594 3595 /* Addresses to be used by KM for negotiation, if ext is available */ 3596 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3597 goto err; 3598 3599 /* selector src */ 3600 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3601 3602 /* selector dst */ 3603 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3604 3605 /* policy information */ 3606 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3607 pol->sadb_x_policy_len = size_pol / 8; 3608 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3609 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3610 pol->sadb_x_policy_dir = dir + 1; 3611 pol->sadb_x_policy_reserved = 0; 3612 pol->sadb_x_policy_id = 0; 3613 pol->sadb_x_policy_priority = 0; 3614 3615 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3616 /* old ipsecrequest */ 3617 int mode = pfkey_mode_from_xfrm(mp->mode); 3618 if (mode < 0) 3619 goto err; 3620 if (set_ipsecrequest(skb, mp->proto, mode, 3621 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3622 mp->reqid, mp->old_family, 3623 &mp->old_saddr, &mp->old_daddr) < 0) 3624 goto err; 3625 3626 /* new ipsecrequest */ 3627 if (set_ipsecrequest(skb, mp->proto, mode, 3628 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3629 mp->reqid, mp->new_family, 3630 &mp->new_saddr, &mp->new_daddr) < 0) 3631 goto err; 3632 } 3633 3634 /* broadcast migrate message to sockets */ 3635 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3636 3637 return 0; 3638 3639 err: 3640 kfree_skb(skb); 3641 return -EINVAL; 3642 } 3643 #else 3644 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3645 const struct xfrm_migrate *m, int num_bundles, 3646 const struct xfrm_kmaddress *k, 3647 const struct xfrm_encap_tmpl *encap) 3648 { 3649 return -ENOPROTOOPT; 3650 } 3651 #endif 3652 3653 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3654 { 3655 struct sock *sk = sock->sk; 3656 struct sk_buff *skb = NULL; 3657 struct sadb_msg *hdr = NULL; 3658 int err; 3659 struct net *net = sock_net(sk); 3660 3661 err = -EOPNOTSUPP; 3662 if (msg->msg_flags & MSG_OOB) 3663 goto out; 3664 3665 err = -EMSGSIZE; 3666 if ((unsigned int)len > sk->sk_sndbuf - 32) 3667 goto out; 3668 3669 err = -ENOBUFS; 3670 skb = alloc_skb(len, GFP_KERNEL); 3671 if (skb == NULL) 3672 goto out; 3673 3674 err = -EFAULT; 3675 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3676 goto out; 3677 3678 hdr = pfkey_get_base_msg(skb, &err); 3679 if (!hdr) 3680 goto out; 3681 3682 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3683 err = pfkey_process(sk, skb, hdr); 3684 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3685 3686 out: 3687 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3688 err = 0; 3689 kfree_skb(skb); 3690 3691 return err ? : len; 3692 } 3693 3694 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3695 int flags) 3696 { 3697 struct sock *sk = sock->sk; 3698 struct pfkey_sock *pfk = pfkey_sk(sk); 3699 struct sk_buff *skb; 3700 int copied, err; 3701 3702 err = -EINVAL; 3703 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3704 goto out; 3705 3706 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3707 if (skb == NULL) 3708 goto out; 3709 3710 copied = skb->len; 3711 if (copied > len) { 3712 msg->msg_flags |= MSG_TRUNC; 3713 copied = len; 3714 } 3715 3716 skb_reset_transport_header(skb); 3717 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3718 if (err) 3719 goto out_free; 3720 3721 sock_recv_ts_and_drops(msg, sk, skb); 3722 3723 err = (flags & MSG_TRUNC) ? skb->len : copied; 3724 3725 if (pfk->dump.dump != NULL && 3726 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3727 pfkey_do_dump(pfk); 3728 3729 out_free: 3730 skb_free_datagram(sk, skb); 3731 out: 3732 return err; 3733 } 3734 3735 static const struct proto_ops pfkey_ops = { 3736 .family = PF_KEY, 3737 .owner = THIS_MODULE, 3738 /* Operations that make no sense on pfkey sockets. */ 3739 .bind = sock_no_bind, 3740 .connect = sock_no_connect, 3741 .socketpair = sock_no_socketpair, 3742 .accept = sock_no_accept, 3743 .getname = sock_no_getname, 3744 .ioctl = sock_no_ioctl, 3745 .listen = sock_no_listen, 3746 .shutdown = sock_no_shutdown, 3747 .setsockopt = sock_no_setsockopt, 3748 .getsockopt = sock_no_getsockopt, 3749 .mmap = sock_no_mmap, 3750 .sendpage = sock_no_sendpage, 3751 3752 /* Now the operations that really occur. */ 3753 .release = pfkey_release, 3754 .poll = datagram_poll, 3755 .sendmsg = pfkey_sendmsg, 3756 .recvmsg = pfkey_recvmsg, 3757 }; 3758 3759 static const struct net_proto_family pfkey_family_ops = { 3760 .family = PF_KEY, 3761 .create = pfkey_create, 3762 .owner = THIS_MODULE, 3763 }; 3764 3765 #ifdef CONFIG_PROC_FS 3766 static int pfkey_seq_show(struct seq_file *f, void *v) 3767 { 3768 struct sock *s = sk_entry(v); 3769 3770 if (v == SEQ_START_TOKEN) 3771 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3772 else 3773 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3774 s, 3775 refcount_read(&s->sk_refcnt), 3776 sk_rmem_alloc_get(s), 3777 sk_wmem_alloc_get(s), 3778 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3779 sock_i_ino(s) 3780 ); 3781 return 0; 3782 } 3783 3784 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3785 __acquires(rcu) 3786 { 3787 struct net *net = seq_file_net(f); 3788 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3789 3790 rcu_read_lock(); 3791 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3792 } 3793 3794 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3795 { 3796 struct net *net = seq_file_net(f); 3797 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3798 3799 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3800 } 3801 3802 static void pfkey_seq_stop(struct seq_file *f, void *v) 3803 __releases(rcu) 3804 { 3805 rcu_read_unlock(); 3806 } 3807 3808 static const struct seq_operations pfkey_seq_ops = { 3809 .start = pfkey_seq_start, 3810 .next = pfkey_seq_next, 3811 .stop = pfkey_seq_stop, 3812 .show = pfkey_seq_show, 3813 }; 3814 3815 static int __net_init pfkey_init_proc(struct net *net) 3816 { 3817 struct proc_dir_entry *e; 3818 3819 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3820 sizeof(struct seq_net_private)); 3821 if (e == NULL) 3822 return -ENOMEM; 3823 3824 return 0; 3825 } 3826 3827 static void __net_exit pfkey_exit_proc(struct net *net) 3828 { 3829 remove_proc_entry("pfkey", net->proc_net); 3830 } 3831 #else 3832 static inline int pfkey_init_proc(struct net *net) 3833 { 3834 return 0; 3835 } 3836 3837 static inline void pfkey_exit_proc(struct net *net) 3838 { 3839 } 3840 #endif 3841 3842 static struct xfrm_mgr pfkeyv2_mgr = 3843 { 3844 .notify = pfkey_send_notify, 3845 .acquire = pfkey_send_acquire, 3846 .compile_policy = pfkey_compile_policy, 3847 .new_mapping = pfkey_send_new_mapping, 3848 .notify_policy = pfkey_send_policy_notify, 3849 .migrate = pfkey_send_migrate, 3850 .is_alive = pfkey_is_alive, 3851 }; 3852 3853 static int __net_init pfkey_net_init(struct net *net) 3854 { 3855 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3856 int rv; 3857 3858 INIT_HLIST_HEAD(&net_pfkey->table); 3859 atomic_set(&net_pfkey->socks_nr, 0); 3860 3861 rv = pfkey_init_proc(net); 3862 3863 return rv; 3864 } 3865 3866 static void __net_exit pfkey_net_exit(struct net *net) 3867 { 3868 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3869 3870 pfkey_exit_proc(net); 3871 WARN_ON(!hlist_empty(&net_pfkey->table)); 3872 } 3873 3874 static struct pernet_operations pfkey_net_ops = { 3875 .init = pfkey_net_init, 3876 .exit = pfkey_net_exit, 3877 .id = &pfkey_net_id, 3878 .size = sizeof(struct netns_pfkey), 3879 }; 3880 3881 static void __exit ipsec_pfkey_exit(void) 3882 { 3883 xfrm_unregister_km(&pfkeyv2_mgr); 3884 sock_unregister(PF_KEY); 3885 unregister_pernet_subsys(&pfkey_net_ops); 3886 proto_unregister(&key_proto); 3887 } 3888 3889 static int __init ipsec_pfkey_init(void) 3890 { 3891 int err = proto_register(&key_proto, 0); 3892 3893 if (err != 0) 3894 goto out; 3895 3896 err = register_pernet_subsys(&pfkey_net_ops); 3897 if (err != 0) 3898 goto out_unregister_key_proto; 3899 err = sock_register(&pfkey_family_ops); 3900 if (err != 0) 3901 goto out_unregister_pernet; 3902 err = xfrm_register_km(&pfkeyv2_mgr); 3903 if (err != 0) 3904 goto out_sock_unregister; 3905 out: 3906 return err; 3907 3908 out_sock_unregister: 3909 sock_unregister(PF_KEY); 3910 out_unregister_pernet: 3911 unregister_pernet_subsys(&pfkey_net_ops); 3912 out_unregister_key_proto: 3913 proto_unregister(&key_proto); 3914 goto out; 3915 } 3916 3917 module_init(ipsec_pfkey_init); 3918 module_exit(ipsec_pfkey_exit); 3919 MODULE_LICENSE("GPL"); 3920 MODULE_ALIAS_NETPROTO(PF_KEY); 3921