1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 4 * 5 * Authors: Maxim Giryaev <gem@asplinux.ru> 6 * David S. Miller <davem@redhat.com> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 10 * Derek Atkins <derek@ihtfp.com> 11 */ 12 13 #include <linux/capability.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/socket.h> 17 #include <linux/pfkeyv2.h> 18 #include <linux/ipsec.h> 19 #include <linux/skbuff.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/in.h> 22 #include <linux/in6.h> 23 #include <linux/proc_fs.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <net/net_namespace.h> 27 #include <net/netns/generic.h> 28 #include <net/xfrm.h> 29 30 #include <net/sock.h> 31 32 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 33 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 34 35 static unsigned int pfkey_net_id __read_mostly; 36 struct netns_pfkey { 37 /* List of all pfkey sockets. */ 38 struct hlist_head table; 39 atomic_t socks_nr; 40 }; 41 static DEFINE_MUTEX(pfkey_mutex); 42 43 #define DUMMY_MARK 0 44 static const struct xfrm_mark dummy_mark = {0, 0}; 45 struct pfkey_sock { 46 /* struct sock must be the first member of struct pfkey_sock */ 47 struct sock sk; 48 int registered; 49 int promisc; 50 51 struct { 52 uint8_t msg_version; 53 uint32_t msg_portid; 54 int (*dump)(struct pfkey_sock *sk); 55 void (*done)(struct pfkey_sock *sk); 56 union { 57 struct xfrm_policy_walk policy; 58 struct xfrm_state_walk state; 59 } u; 60 struct sk_buff *skb; 61 } dump; 62 struct mutex dump_lock; 63 }; 64 65 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 66 xfrm_address_t *saddr, xfrm_address_t *daddr, 67 u16 *family); 68 69 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 70 { 71 return (struct pfkey_sock *)sk; 72 } 73 74 static int pfkey_can_dump(const struct sock *sk) 75 { 76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 77 return 1; 78 return 0; 79 } 80 81 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 82 { 83 if (pfk->dump.dump) { 84 if (pfk->dump.skb) { 85 kfree_skb(pfk->dump.skb); 86 pfk->dump.skb = NULL; 87 } 88 pfk->dump.done(pfk); 89 pfk->dump.dump = NULL; 90 pfk->dump.done = NULL; 91 } 92 } 93 94 static void pfkey_sock_destruct(struct sock *sk) 95 { 96 struct net *net = sock_net(sk); 97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 98 99 pfkey_terminate_dump(pfkey_sk(sk)); 100 skb_queue_purge(&sk->sk_receive_queue); 101 102 if (!sock_flag(sk, SOCK_DEAD)) { 103 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 104 return; 105 } 106 107 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 108 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 109 110 atomic_dec(&net_pfkey->socks_nr); 111 } 112 113 static const struct proto_ops pfkey_ops; 114 115 static void pfkey_insert(struct sock *sk) 116 { 117 struct net *net = sock_net(sk); 118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 119 120 mutex_lock(&pfkey_mutex); 121 sk_add_node_rcu(sk, &net_pfkey->table); 122 mutex_unlock(&pfkey_mutex); 123 } 124 125 static void pfkey_remove(struct sock *sk) 126 { 127 mutex_lock(&pfkey_mutex); 128 sk_del_node_init_rcu(sk); 129 mutex_unlock(&pfkey_mutex); 130 } 131 132 static struct proto key_proto = { 133 .name = "KEY", 134 .owner = THIS_MODULE, 135 .obj_size = sizeof(struct pfkey_sock), 136 }; 137 138 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 139 int kern) 140 { 141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 142 struct sock *sk; 143 struct pfkey_sock *pfk; 144 145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 146 return -EPERM; 147 if (sock->type != SOCK_RAW) 148 return -ESOCKTNOSUPPORT; 149 if (protocol != PF_KEY_V2) 150 return -EPROTONOSUPPORT; 151 152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 153 if (sk == NULL) 154 return -ENOMEM; 155 156 pfk = pfkey_sk(sk); 157 mutex_init(&pfk->dump_lock); 158 159 sock->ops = &pfkey_ops; 160 sock_init_data(sock, sk); 161 162 sk->sk_family = PF_KEY; 163 sk->sk_destruct = pfkey_sock_destruct; 164 165 atomic_inc(&net_pfkey->socks_nr); 166 167 pfkey_insert(sk); 168 169 return 0; 170 } 171 172 static int pfkey_release(struct socket *sock) 173 { 174 struct sock *sk = sock->sk; 175 176 if (!sk) 177 return 0; 178 179 pfkey_remove(sk); 180 181 sock_orphan(sk); 182 sock->sk = NULL; 183 skb_queue_purge(&sk->sk_write_queue); 184 185 synchronize_rcu(); 186 sock_put(sk); 187 188 return 0; 189 } 190 191 static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 192 struct sock *sk) 193 { 194 int err = -ENOBUFS; 195 196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 197 return err; 198 199 skb = skb_clone(skb, allocation); 200 201 if (skb) { 202 skb_set_owner_r(skb, sk); 203 skb_queue_tail(&sk->sk_receive_queue, skb); 204 sk->sk_data_ready(sk); 205 err = 0; 206 } 207 return err; 208 } 209 210 /* Send SKB to all pfkey sockets matching selected criteria. */ 211 #define BROADCAST_ALL 0 212 #define BROADCAST_ONE 1 213 #define BROADCAST_REGISTERED 2 214 #define BROADCAST_PROMISC_ONLY 4 215 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 216 int broadcast_flags, struct sock *one_sk, 217 struct net *net) 218 { 219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 220 struct sock *sk; 221 int err = -ESRCH; 222 223 /* XXX Do we need something like netlink_overrun? I think 224 * XXX PF_KEY socket apps will not mind current behavior. 225 */ 226 if (!skb) 227 return -ENOMEM; 228 229 rcu_read_lock(); 230 sk_for_each_rcu(sk, &net_pfkey->table) { 231 struct pfkey_sock *pfk = pfkey_sk(sk); 232 int err2; 233 234 /* Yes, it means that if you are meant to receive this 235 * pfkey message you receive it twice as promiscuous 236 * socket. 237 */ 238 if (pfk->promisc) 239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 240 241 /* the exact target will be processed later */ 242 if (sk == one_sk) 243 continue; 244 if (broadcast_flags != BROADCAST_ALL) { 245 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 246 continue; 247 if ((broadcast_flags & BROADCAST_REGISTERED) && 248 !pfk->registered) 249 continue; 250 if (broadcast_flags & BROADCAST_ONE) 251 continue; 252 } 253 254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 255 256 /* Error is cleared after successful sending to at least one 257 * registered KM */ 258 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 259 err = err2; 260 } 261 rcu_read_unlock(); 262 263 if (one_sk != NULL) 264 err = pfkey_broadcast_one(skb, allocation, one_sk); 265 266 kfree_skb(skb); 267 return err; 268 } 269 270 static int pfkey_do_dump(struct pfkey_sock *pfk) 271 { 272 struct sadb_msg *hdr; 273 int rc; 274 275 mutex_lock(&pfk->dump_lock); 276 if (!pfk->dump.dump) { 277 rc = 0; 278 goto out; 279 } 280 281 rc = pfk->dump.dump(pfk); 282 if (rc == -ENOBUFS) { 283 rc = 0; 284 goto out; 285 } 286 287 if (pfk->dump.skb) { 288 if (!pfkey_can_dump(&pfk->sk)) { 289 rc = 0; 290 goto out; 291 } 292 293 hdr = (struct sadb_msg *) pfk->dump.skb->data; 294 hdr->sadb_msg_seq = 0; 295 hdr->sadb_msg_errno = rc; 296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 297 &pfk->sk, sock_net(&pfk->sk)); 298 pfk->dump.skb = NULL; 299 } 300 301 pfkey_terminate_dump(pfk); 302 303 out: 304 mutex_unlock(&pfk->dump_lock); 305 return rc; 306 } 307 308 static inline void pfkey_hdr_dup(struct sadb_msg *new, 309 const struct sadb_msg *orig) 310 { 311 *new = *orig; 312 } 313 314 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 315 { 316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 317 struct sadb_msg *hdr; 318 319 if (!skb) 320 return -ENOBUFS; 321 322 /* Woe be to the platform trying to support PFKEY yet 323 * having normal errnos outside the 1-255 range, inclusive. 324 */ 325 err = -err; 326 if (err == ERESTARTSYS || 327 err == ERESTARTNOHAND || 328 err == ERESTARTNOINTR) 329 err = EINTR; 330 if (err >= 512) 331 err = EINVAL; 332 BUG_ON(err <= 0 || err >= 256); 333 334 hdr = skb_put(skb, sizeof(struct sadb_msg)); 335 pfkey_hdr_dup(hdr, orig); 336 hdr->sadb_msg_errno = (uint8_t) err; 337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 338 sizeof(uint64_t)); 339 340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 341 342 return 0; 343 } 344 345 static const u8 sadb_ext_min_len[] = { 346 [SADB_EXT_RESERVED] = (u8) 0, 347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 373 }; 374 375 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 376 static int verify_address_len(const void *p) 377 { 378 const struct sadb_address *sp = p; 379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 380 const struct sockaddr_in *sin; 381 #if IS_ENABLED(CONFIG_IPV6) 382 const struct sockaddr_in6 *sin6; 383 #endif 384 int len; 385 386 if (sp->sadb_address_len < 387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 388 sizeof(uint64_t))) 389 return -EINVAL; 390 391 switch (addr->sa_family) { 392 case AF_INET: 393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 394 if (sp->sadb_address_len != len || 395 sp->sadb_address_prefixlen > 32) 396 return -EINVAL; 397 break; 398 #if IS_ENABLED(CONFIG_IPV6) 399 case AF_INET6: 400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 401 if (sp->sadb_address_len != len || 402 sp->sadb_address_prefixlen > 128) 403 return -EINVAL; 404 break; 405 #endif 406 default: 407 /* It is user using kernel to keep track of security 408 * associations for another protocol, such as 409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 410 * lengths. 411 * 412 * XXX Actually, association/policy database is not yet 413 * XXX able to cope with arbitrary sockaddr families. 414 * XXX When it can, remove this -EINVAL. -DaveM 415 */ 416 return -EINVAL; 417 } 418 419 return 0; 420 } 421 422 static inline int sadb_key_len(const struct sadb_key *key) 423 { 424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 425 426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 427 sizeof(uint64_t)); 428 } 429 430 static int verify_key_len(const void *p) 431 { 432 const struct sadb_key *key = p; 433 434 if (sadb_key_len(key) > key->sadb_key_len) 435 return -EINVAL; 436 437 return 0; 438 } 439 440 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 441 { 442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 443 sec_ctx->sadb_x_ctx_len, 444 sizeof(uint64_t)); 445 } 446 447 static inline int verify_sec_ctx_len(const void *p) 448 { 449 const struct sadb_x_sec_ctx *sec_ctx = p; 450 int len = sec_ctx->sadb_x_ctx_len; 451 452 if (len > PAGE_SIZE) 453 return -EINVAL; 454 455 len = pfkey_sec_ctx_len(sec_ctx); 456 457 if (sec_ctx->sadb_x_sec_len != len) 458 return -EINVAL; 459 460 return 0; 461 } 462 463 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 464 gfp_t gfp) 465 { 466 struct xfrm_user_sec_ctx *uctx = NULL; 467 int ctx_size = sec_ctx->sadb_x_ctx_len; 468 469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 470 471 if (!uctx) 472 return NULL; 473 474 uctx->len = pfkey_sec_ctx_len(sec_ctx); 475 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 479 memcpy(uctx + 1, sec_ctx + 1, 480 uctx->ctx_len); 481 482 return uctx; 483 } 484 485 static int present_and_same_family(const struct sadb_address *src, 486 const struct sadb_address *dst) 487 { 488 const struct sockaddr *s_addr, *d_addr; 489 490 if (!src || !dst) 491 return 0; 492 493 s_addr = (const struct sockaddr *)(src + 1); 494 d_addr = (const struct sockaddr *)(dst + 1); 495 if (s_addr->sa_family != d_addr->sa_family) 496 return 0; 497 if (s_addr->sa_family != AF_INET 498 #if IS_ENABLED(CONFIG_IPV6) 499 && s_addr->sa_family != AF_INET6 500 #endif 501 ) 502 return 0; 503 504 return 1; 505 } 506 507 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 508 { 509 const char *p = (char *) hdr; 510 int len = skb->len; 511 512 len -= sizeof(*hdr); 513 p += sizeof(*hdr); 514 while (len > 0) { 515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 516 uint16_t ext_type; 517 int ext_len; 518 519 if (len < sizeof(*ehdr)) 520 return -EINVAL; 521 522 ext_len = ehdr->sadb_ext_len; 523 ext_len *= sizeof(uint64_t); 524 ext_type = ehdr->sadb_ext_type; 525 if (ext_len < sizeof(uint64_t) || 526 ext_len > len || 527 ext_type == SADB_EXT_RESERVED) 528 return -EINVAL; 529 530 if (ext_type <= SADB_EXT_MAX) { 531 int min = (int) sadb_ext_min_len[ext_type]; 532 if (ext_len < min) 533 return -EINVAL; 534 if (ext_hdrs[ext_type-1] != NULL) 535 return -EINVAL; 536 switch (ext_type) { 537 case SADB_EXT_ADDRESS_SRC: 538 case SADB_EXT_ADDRESS_DST: 539 case SADB_EXT_ADDRESS_PROXY: 540 case SADB_X_EXT_NAT_T_OA: 541 if (verify_address_len(p)) 542 return -EINVAL; 543 break; 544 case SADB_X_EXT_SEC_CTX: 545 if (verify_sec_ctx_len(p)) 546 return -EINVAL; 547 break; 548 case SADB_EXT_KEY_AUTH: 549 case SADB_EXT_KEY_ENCRYPT: 550 if (verify_key_len(p)) 551 return -EINVAL; 552 break; 553 default: 554 break; 555 } 556 ext_hdrs[ext_type-1] = (void *) p; 557 } 558 p += ext_len; 559 len -= ext_len; 560 } 561 562 return 0; 563 } 564 565 static uint16_t 566 pfkey_satype2proto(uint8_t satype) 567 { 568 switch (satype) { 569 case SADB_SATYPE_UNSPEC: 570 return IPSEC_PROTO_ANY; 571 case SADB_SATYPE_AH: 572 return IPPROTO_AH; 573 case SADB_SATYPE_ESP: 574 return IPPROTO_ESP; 575 case SADB_X_SATYPE_IPCOMP: 576 return IPPROTO_COMP; 577 default: 578 return 0; 579 } 580 /* NOTREACHED */ 581 } 582 583 static uint8_t 584 pfkey_proto2satype(uint16_t proto) 585 { 586 switch (proto) { 587 case IPPROTO_AH: 588 return SADB_SATYPE_AH; 589 case IPPROTO_ESP: 590 return SADB_SATYPE_ESP; 591 case IPPROTO_COMP: 592 return SADB_X_SATYPE_IPCOMP; 593 default: 594 return 0; 595 } 596 /* NOTREACHED */ 597 } 598 599 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 600 * say specifically 'just raw sockets' as we encode them as 255. 601 */ 602 603 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 604 { 605 return proto == IPSEC_PROTO_ANY ? 0 : proto; 606 } 607 608 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 609 { 610 return proto ? proto : IPSEC_PROTO_ANY; 611 } 612 613 static inline int pfkey_sockaddr_len(sa_family_t family) 614 { 615 switch (family) { 616 case AF_INET: 617 return sizeof(struct sockaddr_in); 618 #if IS_ENABLED(CONFIG_IPV6) 619 case AF_INET6: 620 return sizeof(struct sockaddr_in6); 621 #endif 622 } 623 return 0; 624 } 625 626 static 627 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 628 { 629 switch (sa->sa_family) { 630 case AF_INET: 631 xaddr->a4 = 632 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 633 return AF_INET; 634 #if IS_ENABLED(CONFIG_IPV6) 635 case AF_INET6: 636 memcpy(xaddr->a6, 637 &((struct sockaddr_in6 *)sa)->sin6_addr, 638 sizeof(struct in6_addr)); 639 return AF_INET6; 640 #endif 641 } 642 return 0; 643 } 644 645 static 646 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 647 { 648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 649 xaddr); 650 } 651 652 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 653 { 654 const struct sadb_sa *sa; 655 const struct sadb_address *addr; 656 uint16_t proto; 657 unsigned short family; 658 xfrm_address_t *xaddr; 659 660 sa = ext_hdrs[SADB_EXT_SA - 1]; 661 if (sa == NULL) 662 return NULL; 663 664 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 665 if (proto == 0) 666 return NULL; 667 668 /* sadb_address_len should be checked by caller */ 669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 670 if (addr == NULL) 671 return NULL; 672 673 family = ((const struct sockaddr *)(addr + 1))->sa_family; 674 switch (family) { 675 case AF_INET: 676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 677 break; 678 #if IS_ENABLED(CONFIG_IPV6) 679 case AF_INET6: 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 681 break; 682 #endif 683 default: 684 xaddr = NULL; 685 } 686 687 if (!xaddr) 688 return NULL; 689 690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 691 } 692 693 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 694 695 static int 696 pfkey_sockaddr_size(sa_family_t family) 697 { 698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 699 } 700 701 static inline int pfkey_mode_from_xfrm(int mode) 702 { 703 switch(mode) { 704 case XFRM_MODE_TRANSPORT: 705 return IPSEC_MODE_TRANSPORT; 706 case XFRM_MODE_TUNNEL: 707 return IPSEC_MODE_TUNNEL; 708 case XFRM_MODE_BEET: 709 return IPSEC_MODE_BEET; 710 default: 711 return -1; 712 } 713 } 714 715 static inline int pfkey_mode_to_xfrm(int mode) 716 { 717 switch(mode) { 718 case IPSEC_MODE_ANY: /*XXX*/ 719 case IPSEC_MODE_TRANSPORT: 720 return XFRM_MODE_TRANSPORT; 721 case IPSEC_MODE_TUNNEL: 722 return XFRM_MODE_TUNNEL; 723 case IPSEC_MODE_BEET: 724 return XFRM_MODE_BEET; 725 default: 726 return -1; 727 } 728 } 729 730 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 731 struct sockaddr *sa, 732 unsigned short family) 733 { 734 switch (family) { 735 case AF_INET: 736 { 737 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 738 sin->sin_family = AF_INET; 739 sin->sin_port = port; 740 sin->sin_addr.s_addr = xaddr->a4; 741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 742 return 32; 743 } 744 #if IS_ENABLED(CONFIG_IPV6) 745 case AF_INET6: 746 { 747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 748 sin6->sin6_family = AF_INET6; 749 sin6->sin6_port = port; 750 sin6->sin6_flowinfo = 0; 751 sin6->sin6_addr = xaddr->in6; 752 sin6->sin6_scope_id = 0; 753 return 128; 754 } 755 #endif 756 } 757 return 0; 758 } 759 760 static unsigned int pfkey_sockaddr_fill_zero_tail(const xfrm_address_t *xaddr, 761 __be16 port, 762 struct sockaddr *sa, 763 unsigned short family) 764 { 765 unsigned int prefixlen; 766 int sockaddr_len = pfkey_sockaddr_len(family); 767 int sockaddr_size = pfkey_sockaddr_size(family); 768 769 prefixlen = pfkey_sockaddr_fill(xaddr, port, sa, family); 770 if (sockaddr_size > sockaddr_len) 771 memset((u8 *)sa + sockaddr_len, 0, sockaddr_size - sockaddr_len); 772 773 return prefixlen; 774 } 775 776 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 777 int add_keys, int hsc) 778 { 779 struct sk_buff *skb; 780 struct sadb_msg *hdr; 781 struct sadb_sa *sa; 782 struct sadb_lifetime *lifetime; 783 struct sadb_address *addr; 784 struct sadb_key *key; 785 struct sadb_x_sa2 *sa2; 786 struct sadb_x_sec_ctx *sec_ctx; 787 struct xfrm_sec_ctx *xfrm_ctx; 788 int ctx_size = 0; 789 int size; 790 int auth_key_size = 0; 791 int encrypt_key_size = 0; 792 int sockaddr_size; 793 struct xfrm_encap_tmpl *natt = NULL; 794 int mode; 795 796 /* address family check */ 797 sockaddr_size = pfkey_sockaddr_size(x->props.family); 798 if (!sockaddr_size) 799 return ERR_PTR(-EINVAL); 800 801 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 802 key(AE), (identity(SD),) (sensitivity)> */ 803 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 804 sizeof(struct sadb_lifetime) + 805 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 806 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 807 sizeof(struct sadb_address)*2 + 808 sockaddr_size*2 + 809 sizeof(struct sadb_x_sa2); 810 811 if ((xfrm_ctx = x->security)) { 812 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 813 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 814 } 815 816 /* identity & sensitivity */ 817 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 818 size += sizeof(struct sadb_address) + sockaddr_size; 819 820 if (add_keys) { 821 if (x->aalg && x->aalg->alg_key_len) { 822 auth_key_size = 823 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 824 size += sizeof(struct sadb_key) + auth_key_size; 825 } 826 if (x->ealg && x->ealg->alg_key_len) { 827 encrypt_key_size = 828 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 829 size += sizeof(struct sadb_key) + encrypt_key_size; 830 } 831 } 832 if (x->encap) 833 natt = x->encap; 834 835 if (natt && natt->encap_type) { 836 size += sizeof(struct sadb_x_nat_t_type); 837 size += sizeof(struct sadb_x_nat_t_port); 838 size += sizeof(struct sadb_x_nat_t_port); 839 } 840 841 skb = alloc_skb(size + 16, GFP_ATOMIC); 842 if (skb == NULL) 843 return ERR_PTR(-ENOBUFS); 844 845 /* call should fill header later */ 846 hdr = skb_put(skb, sizeof(struct sadb_msg)); 847 memset(hdr, 0, size); /* XXX do we need this ? */ 848 hdr->sadb_msg_len = size / sizeof(uint64_t); 849 850 /* sa */ 851 sa = skb_put(skb, sizeof(struct sadb_sa)); 852 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 853 sa->sadb_sa_exttype = SADB_EXT_SA; 854 sa->sadb_sa_spi = x->id.spi; 855 sa->sadb_sa_replay = x->props.replay_window; 856 switch (x->km.state) { 857 case XFRM_STATE_VALID: 858 sa->sadb_sa_state = x->km.dying ? 859 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 860 break; 861 case XFRM_STATE_ACQ: 862 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 863 break; 864 default: 865 sa->sadb_sa_state = SADB_SASTATE_DEAD; 866 break; 867 } 868 sa->sadb_sa_auth = 0; 869 if (x->aalg) { 870 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 871 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 872 a->desc.sadb_alg_id : 0; 873 } 874 sa->sadb_sa_encrypt = 0; 875 BUG_ON(x->ealg && x->calg); 876 if (x->ealg) { 877 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 878 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 879 a->desc.sadb_alg_id : 0; 880 } 881 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 882 if (x->calg) { 883 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 884 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 885 a->desc.sadb_alg_id : 0; 886 } 887 888 sa->sadb_sa_flags = 0; 889 if (x->props.flags & XFRM_STATE_NOECN) 890 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 891 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 892 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 893 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 894 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 895 896 /* hard time */ 897 if (hsc & 2) { 898 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 899 lifetime->sadb_lifetime_len = 900 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 901 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 902 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 903 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 904 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 905 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 906 } 907 /* soft time */ 908 if (hsc & 1) { 909 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 910 lifetime->sadb_lifetime_len = 911 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 912 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 913 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 914 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 915 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 916 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 917 } 918 /* current time */ 919 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 920 lifetime->sadb_lifetime_len = 921 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 922 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 923 lifetime->sadb_lifetime_allocations = x->curlft.packets; 924 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 925 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 926 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 927 /* src address */ 928 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 929 addr->sadb_address_len = 930 (sizeof(struct sadb_address)+sockaddr_size)/ 931 sizeof(uint64_t); 932 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 933 /* "if the ports are non-zero, then the sadb_address_proto field, 934 normally zero, MUST be filled in with the transport 935 protocol's number." - RFC2367 */ 936 addr->sadb_address_proto = 0; 937 addr->sadb_address_reserved = 0; 938 939 addr->sadb_address_prefixlen = 940 pfkey_sockaddr_fill(&x->props.saddr, 0, 941 (struct sockaddr *) (addr + 1), 942 x->props.family); 943 BUG_ON(!addr->sadb_address_prefixlen); 944 945 /* dst address */ 946 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 947 addr->sadb_address_len = 948 (sizeof(struct sadb_address)+sockaddr_size)/ 949 sizeof(uint64_t); 950 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 951 addr->sadb_address_proto = 0; 952 addr->sadb_address_reserved = 0; 953 954 addr->sadb_address_prefixlen = 955 pfkey_sockaddr_fill(&x->id.daddr, 0, 956 (struct sockaddr *) (addr + 1), 957 x->props.family); 958 BUG_ON(!addr->sadb_address_prefixlen); 959 960 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 961 x->props.family)) { 962 addr = skb_put(skb, 963 sizeof(struct sadb_address) + sockaddr_size); 964 addr->sadb_address_len = 965 (sizeof(struct sadb_address)+sockaddr_size)/ 966 sizeof(uint64_t); 967 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 968 addr->sadb_address_proto = 969 pfkey_proto_from_xfrm(x->sel.proto); 970 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 971 addr->sadb_address_reserved = 0; 972 973 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 974 (struct sockaddr *) (addr + 1), 975 x->props.family); 976 } 977 978 /* auth key */ 979 if (add_keys && auth_key_size) { 980 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 981 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 982 sizeof(uint64_t); 983 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 984 key->sadb_key_bits = x->aalg->alg_key_len; 985 key->sadb_key_reserved = 0; 986 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 987 } 988 /* encrypt key */ 989 if (add_keys && encrypt_key_size) { 990 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 991 key->sadb_key_len = (sizeof(struct sadb_key) + 992 encrypt_key_size) / sizeof(uint64_t); 993 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 994 key->sadb_key_bits = x->ealg->alg_key_len; 995 key->sadb_key_reserved = 0; 996 memcpy(key + 1, x->ealg->alg_key, 997 (x->ealg->alg_key_len+7)/8); 998 } 999 1000 /* sa */ 1001 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 1002 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 1003 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 1004 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 1005 kfree_skb(skb); 1006 return ERR_PTR(-EINVAL); 1007 } 1008 sa2->sadb_x_sa2_mode = mode; 1009 sa2->sadb_x_sa2_reserved1 = 0; 1010 sa2->sadb_x_sa2_reserved2 = 0; 1011 sa2->sadb_x_sa2_sequence = 0; 1012 sa2->sadb_x_sa2_reqid = x->props.reqid; 1013 1014 if (natt && natt->encap_type) { 1015 struct sadb_x_nat_t_type *n_type; 1016 struct sadb_x_nat_t_port *n_port; 1017 1018 /* type */ 1019 n_type = skb_put(skb, sizeof(*n_type)); 1020 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1021 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1022 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1023 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1024 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1025 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1026 1027 /* source port */ 1028 n_port = skb_put(skb, sizeof(*n_port)); 1029 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1030 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1031 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1032 n_port->sadb_x_nat_t_port_reserved = 0; 1033 1034 /* dest port */ 1035 n_port = skb_put(skb, sizeof(*n_port)); 1036 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1037 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1038 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1039 n_port->sadb_x_nat_t_port_reserved = 0; 1040 } 1041 1042 /* security context */ 1043 if (xfrm_ctx) { 1044 sec_ctx = skb_put(skb, 1045 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1046 sec_ctx->sadb_x_sec_len = 1047 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1048 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1049 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1050 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1051 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1052 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1053 xfrm_ctx->ctx_len); 1054 } 1055 1056 return skb; 1057 } 1058 1059 1060 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1061 { 1062 struct sk_buff *skb; 1063 1064 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1065 1066 return skb; 1067 } 1068 1069 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1070 int hsc) 1071 { 1072 return __pfkey_xfrm_state2msg(x, 0, hsc); 1073 } 1074 1075 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1076 const struct sadb_msg *hdr, 1077 void * const *ext_hdrs) 1078 { 1079 struct xfrm_state *x; 1080 const struct sadb_lifetime *lifetime; 1081 const struct sadb_sa *sa; 1082 const struct sadb_key *key; 1083 const struct sadb_x_sec_ctx *sec_ctx; 1084 uint16_t proto; 1085 int err; 1086 1087 1088 sa = ext_hdrs[SADB_EXT_SA - 1]; 1089 if (!sa || 1090 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1091 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1092 return ERR_PTR(-EINVAL); 1093 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1094 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1095 return ERR_PTR(-EINVAL); 1096 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1097 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1098 return ERR_PTR(-EINVAL); 1099 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1100 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1101 return ERR_PTR(-EINVAL); 1102 1103 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1104 if (proto == 0) 1105 return ERR_PTR(-EINVAL); 1106 1107 /* default error is no buffer space */ 1108 err = -ENOBUFS; 1109 1110 /* RFC2367: 1111 1112 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1113 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1114 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1115 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1116 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1117 not true. 1118 1119 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1120 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1121 */ 1122 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1123 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1124 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1125 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1126 return ERR_PTR(-EINVAL); 1127 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1128 if (key != NULL && 1129 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1130 key->sadb_key_bits == 0) 1131 return ERR_PTR(-EINVAL); 1132 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1133 if (key != NULL && 1134 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1135 key->sadb_key_bits == 0) 1136 return ERR_PTR(-EINVAL); 1137 1138 x = xfrm_state_alloc(net); 1139 if (x == NULL) 1140 return ERR_PTR(-ENOBUFS); 1141 1142 x->id.proto = proto; 1143 x->id.spi = sa->sadb_sa_spi; 1144 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1145 (sizeof(x->replay.bitmap) * 8)); 1146 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1147 x->props.flags |= XFRM_STATE_NOECN; 1148 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1149 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1150 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1151 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1152 1153 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1154 if (lifetime != NULL) { 1155 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1156 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1157 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1158 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1159 } 1160 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1161 if (lifetime != NULL) { 1162 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1163 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1164 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1165 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1166 } 1167 1168 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1169 if (sec_ctx != NULL) { 1170 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1171 1172 if (!uctx) 1173 goto out; 1174 1175 err = security_xfrm_state_alloc(x, uctx); 1176 kfree(uctx); 1177 1178 if (err) 1179 goto out; 1180 } 1181 1182 err = -ENOBUFS; 1183 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1184 if (sa->sadb_sa_auth) { 1185 int keysize = 0; 1186 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1187 if (!a || !a->pfkey_supported) { 1188 err = -ENOSYS; 1189 goto out; 1190 } 1191 if (key) 1192 keysize = (key->sadb_key_bits + 7) / 8; 1193 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1194 if (!x->aalg) { 1195 err = -ENOMEM; 1196 goto out; 1197 } 1198 strcpy(x->aalg->alg_name, a->name); 1199 x->aalg->alg_key_len = 0; 1200 if (key) { 1201 x->aalg->alg_key_len = key->sadb_key_bits; 1202 memcpy(x->aalg->alg_key, key+1, keysize); 1203 } 1204 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1205 x->props.aalgo = sa->sadb_sa_auth; 1206 /* x->algo.flags = sa->sadb_sa_flags; */ 1207 } 1208 if (sa->sadb_sa_encrypt) { 1209 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1210 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1211 if (!a || !a->pfkey_supported) { 1212 err = -ENOSYS; 1213 goto out; 1214 } 1215 x->calg = kmalloc_obj(*x->calg); 1216 if (!x->calg) { 1217 err = -ENOMEM; 1218 goto out; 1219 } 1220 strcpy(x->calg->alg_name, a->name); 1221 x->calg->alg_key_len = 0; 1222 x->props.calgo = sa->sadb_sa_encrypt; 1223 } else { 1224 int keysize = 0; 1225 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1226 if (!a || !a->pfkey_supported) { 1227 err = -ENOSYS; 1228 goto out; 1229 } 1230 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1231 if (key) 1232 keysize = (key->sadb_key_bits + 7) / 8; 1233 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1234 if (!x->ealg) { 1235 err = -ENOMEM; 1236 goto out; 1237 } 1238 strcpy(x->ealg->alg_name, a->name); 1239 x->ealg->alg_key_len = 0; 1240 if (key) { 1241 x->ealg->alg_key_len = key->sadb_key_bits; 1242 memcpy(x->ealg->alg_key, key+1, keysize); 1243 } 1244 x->props.ealgo = sa->sadb_sa_encrypt; 1245 x->geniv = a->uinfo.encr.geniv; 1246 } 1247 } 1248 /* x->algo.flags = sa->sadb_sa_flags; */ 1249 1250 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1251 &x->props.saddr); 1252 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1253 &x->id.daddr); 1254 1255 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1256 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1257 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1258 if (mode < 0) { 1259 err = -EINVAL; 1260 goto out; 1261 } 1262 x->props.mode = mode; 1263 x->props.reqid = sa2->sadb_x_sa2_reqid; 1264 } 1265 1266 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1267 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1268 1269 /* Nobody uses this, but we try. */ 1270 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1271 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1272 } 1273 1274 if (!x->sel.family) 1275 x->sel.family = x->props.family; 1276 1277 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1278 const struct sadb_x_nat_t_type* n_type; 1279 struct xfrm_encap_tmpl *natt; 1280 1281 x->encap = kzalloc_obj(*x->encap); 1282 if (!x->encap) { 1283 err = -ENOMEM; 1284 goto out; 1285 } 1286 1287 natt = x->encap; 1288 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1289 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1290 1291 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1292 const struct sadb_x_nat_t_port *n_port = 1293 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1294 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1295 } 1296 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1297 const struct sadb_x_nat_t_port *n_port = 1298 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1299 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1300 } 1301 } 1302 1303 err = xfrm_init_state(x, NULL); 1304 if (err) 1305 goto out; 1306 1307 x->km.seq = hdr->sadb_msg_seq; 1308 return x; 1309 1310 out: 1311 x->km.state = XFRM_STATE_DEAD; 1312 xfrm_state_put(x); 1313 return ERR_PTR(err); 1314 } 1315 1316 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1317 { 1318 return -EOPNOTSUPP; 1319 } 1320 1321 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1322 { 1323 struct net *net = sock_net(sk); 1324 struct sk_buff *resp_skb; 1325 struct sadb_x_sa2 *sa2; 1326 struct sadb_address *saddr, *daddr; 1327 struct sadb_msg *out_hdr; 1328 struct sadb_spirange *range; 1329 struct xfrm_state *x = NULL; 1330 int mode; 1331 int err; 1332 u32 min_spi, max_spi; 1333 u32 reqid; 1334 u8 proto; 1335 unsigned short family; 1336 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1337 1338 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1339 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1340 return -EINVAL; 1341 1342 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1343 if (proto == 0) 1344 return -EINVAL; 1345 1346 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1347 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1348 if (mode < 0) 1349 return -EINVAL; 1350 reqid = sa2->sadb_x_sa2_reqid; 1351 } else { 1352 mode = 0; 1353 reqid = 0; 1354 } 1355 1356 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1357 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1358 1359 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1360 switch (family) { 1361 case AF_INET: 1362 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1363 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1364 break; 1365 #if IS_ENABLED(CONFIG_IPV6) 1366 case AF_INET6: 1367 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1368 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1369 break; 1370 #endif 1371 } 1372 1373 if (hdr->sadb_msg_seq) { 1374 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX); 1375 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1376 xfrm_state_put(x); 1377 x = NULL; 1378 } 1379 } 1380 1381 if (!x) 1382 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, UINT_MAX, 1383 proto, xdaddr, xsaddr, 1, family); 1384 1385 if (x == NULL) 1386 return -ENOENT; 1387 1388 min_spi = 0x100; 1389 max_spi = 0x0fffffff; 1390 1391 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1392 if (range) { 1393 min_spi = range->sadb_spirange_min; 1394 max_spi = range->sadb_spirange_max; 1395 } 1396 1397 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL); 1398 if (err) { 1399 xfrm_state_put(x); 1400 return err; 1401 } 1402 1403 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL); 1404 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1405 1406 if (IS_ERR(resp_skb)) { 1407 xfrm_state_put(x); 1408 return PTR_ERR(resp_skb); 1409 } 1410 1411 out_hdr = (struct sadb_msg *) resp_skb->data; 1412 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1413 out_hdr->sadb_msg_type = SADB_GETSPI; 1414 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1415 out_hdr->sadb_msg_errno = 0; 1416 out_hdr->sadb_msg_reserved = 0; 1417 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1418 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1419 1420 xfrm_state_put(x); 1421 1422 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1423 1424 return 0; 1425 } 1426 1427 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1428 { 1429 struct net *net = sock_net(sk); 1430 struct xfrm_state *x; 1431 1432 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1433 return -EOPNOTSUPP; 1434 1435 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1436 return 0; 1437 1438 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX); 1439 if (x == NULL) 1440 return 0; 1441 1442 spin_lock_bh(&x->lock); 1443 if (x->km.state == XFRM_STATE_ACQ) 1444 x->km.state = XFRM_STATE_ERROR; 1445 1446 spin_unlock_bh(&x->lock); 1447 xfrm_state_put(x); 1448 return 0; 1449 } 1450 1451 static inline int event2poltype(int event) 1452 { 1453 switch (event) { 1454 case XFRM_MSG_DELPOLICY: 1455 return SADB_X_SPDDELETE; 1456 case XFRM_MSG_NEWPOLICY: 1457 return SADB_X_SPDADD; 1458 case XFRM_MSG_UPDPOLICY: 1459 return SADB_X_SPDUPDATE; 1460 case XFRM_MSG_POLEXPIRE: 1461 // return SADB_X_SPDEXPIRE; 1462 default: 1463 pr_err("pfkey: Unknown policy event %d\n", event); 1464 break; 1465 } 1466 1467 return 0; 1468 } 1469 1470 static inline int event2keytype(int event) 1471 { 1472 switch (event) { 1473 case XFRM_MSG_DELSA: 1474 return SADB_DELETE; 1475 case XFRM_MSG_NEWSA: 1476 return SADB_ADD; 1477 case XFRM_MSG_UPDSA: 1478 return SADB_UPDATE; 1479 case XFRM_MSG_EXPIRE: 1480 return SADB_EXPIRE; 1481 default: 1482 pr_err("pfkey: Unknown SA event %d\n", event); 1483 break; 1484 } 1485 1486 return 0; 1487 } 1488 1489 /* ADD/UPD/DEL */ 1490 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1491 { 1492 struct sk_buff *skb; 1493 struct sadb_msg *hdr; 1494 1495 skb = pfkey_xfrm_state2msg(x); 1496 1497 if (IS_ERR(skb)) 1498 return PTR_ERR(skb); 1499 1500 hdr = (struct sadb_msg *) skb->data; 1501 hdr->sadb_msg_version = PF_KEY_V2; 1502 hdr->sadb_msg_type = event2keytype(c->event); 1503 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1504 hdr->sadb_msg_errno = 0; 1505 hdr->sadb_msg_reserved = 0; 1506 hdr->sadb_msg_seq = c->seq; 1507 hdr->sadb_msg_pid = c->portid; 1508 1509 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1510 1511 return 0; 1512 } 1513 1514 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1515 { 1516 struct net *net = sock_net(sk); 1517 struct xfrm_state *x; 1518 int err; 1519 struct km_event c; 1520 1521 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1522 if (IS_ERR(x)) 1523 return PTR_ERR(x); 1524 1525 xfrm_state_hold(x); 1526 if (hdr->sadb_msg_type == SADB_ADD) 1527 err = xfrm_state_add(x); 1528 else 1529 err = xfrm_state_update(x); 1530 1531 xfrm_audit_state_add(x, err ? 0 : 1, true); 1532 1533 if (err < 0) { 1534 x->km.state = XFRM_STATE_DEAD; 1535 __xfrm_state_put(x); 1536 goto out; 1537 } 1538 1539 if (hdr->sadb_msg_type == SADB_ADD) 1540 c.event = XFRM_MSG_NEWSA; 1541 else 1542 c.event = XFRM_MSG_UPDSA; 1543 c.seq = hdr->sadb_msg_seq; 1544 c.portid = hdr->sadb_msg_pid; 1545 km_state_notify(x, &c); 1546 out: 1547 xfrm_state_put(x); 1548 return err; 1549 } 1550 1551 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1552 { 1553 struct net *net = sock_net(sk); 1554 struct xfrm_state *x; 1555 struct km_event c; 1556 int err; 1557 1558 if (!ext_hdrs[SADB_EXT_SA-1] || 1559 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1560 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1561 return -EINVAL; 1562 1563 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1564 if (x == NULL) 1565 return -ESRCH; 1566 1567 if ((err = security_xfrm_state_delete(x))) 1568 goto out; 1569 1570 if (xfrm_state_kern(x)) { 1571 err = -EPERM; 1572 goto out; 1573 } 1574 1575 err = xfrm_state_delete(x); 1576 1577 if (err < 0) 1578 goto out; 1579 1580 c.seq = hdr->sadb_msg_seq; 1581 c.portid = hdr->sadb_msg_pid; 1582 c.event = XFRM_MSG_DELSA; 1583 km_state_notify(x, &c); 1584 out: 1585 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1586 xfrm_state_put(x); 1587 1588 return err; 1589 } 1590 1591 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1592 { 1593 struct net *net = sock_net(sk); 1594 __u8 proto; 1595 struct sk_buff *out_skb; 1596 struct sadb_msg *out_hdr; 1597 struct xfrm_state *x; 1598 1599 if (!ext_hdrs[SADB_EXT_SA-1] || 1600 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1601 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1602 return -EINVAL; 1603 1604 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1605 if (x == NULL) 1606 return -ESRCH; 1607 1608 out_skb = pfkey_xfrm_state2msg(x); 1609 proto = x->id.proto; 1610 xfrm_state_put(x); 1611 if (IS_ERR(out_skb)) 1612 return PTR_ERR(out_skb); 1613 1614 out_hdr = (struct sadb_msg *) out_skb->data; 1615 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1616 out_hdr->sadb_msg_type = SADB_GET; 1617 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1618 out_hdr->sadb_msg_errno = 0; 1619 out_hdr->sadb_msg_reserved = 0; 1620 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1621 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1622 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1623 1624 return 0; 1625 } 1626 1627 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1628 gfp_t allocation) 1629 { 1630 struct sk_buff *skb; 1631 struct sadb_msg *hdr; 1632 int len, auth_len, enc_len, i; 1633 1634 auth_len = xfrm_count_pfkey_auth_supported(); 1635 if (auth_len) { 1636 auth_len *= sizeof(struct sadb_alg); 1637 auth_len += sizeof(struct sadb_supported); 1638 } 1639 1640 enc_len = xfrm_count_pfkey_enc_supported(); 1641 if (enc_len) { 1642 enc_len *= sizeof(struct sadb_alg); 1643 enc_len += sizeof(struct sadb_supported); 1644 } 1645 1646 len = enc_len + auth_len + sizeof(struct sadb_msg); 1647 1648 skb = alloc_skb(len + 16, allocation); 1649 if (!skb) 1650 goto out_put_algs; 1651 1652 hdr = skb_put(skb, sizeof(*hdr)); 1653 pfkey_hdr_dup(hdr, orig); 1654 hdr->sadb_msg_errno = 0; 1655 hdr->sadb_msg_len = len / sizeof(uint64_t); 1656 1657 if (auth_len) { 1658 struct sadb_supported *sp; 1659 struct sadb_alg *ap; 1660 1661 sp = skb_put(skb, auth_len); 1662 ap = (struct sadb_alg *) (sp + 1); 1663 1664 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1665 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1666 1667 for (i = 0; ; i++) { 1668 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1669 if (!aalg) 1670 break; 1671 if (!aalg->pfkey_supported) 1672 continue; 1673 if (aalg->available) 1674 *ap++ = aalg->desc; 1675 } 1676 } 1677 1678 if (enc_len) { 1679 struct sadb_supported *sp; 1680 struct sadb_alg *ap; 1681 1682 sp = skb_put(skb, enc_len); 1683 ap = (struct sadb_alg *) (sp + 1); 1684 1685 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1686 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1687 1688 for (i = 0; ; i++) { 1689 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1690 if (!ealg) 1691 break; 1692 if (!ealg->pfkey_supported) 1693 continue; 1694 if (ealg->available) 1695 *ap++ = ealg->desc; 1696 } 1697 } 1698 1699 out_put_algs: 1700 return skb; 1701 } 1702 1703 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1704 { 1705 struct pfkey_sock *pfk = pfkey_sk(sk); 1706 struct sk_buff *supp_skb; 1707 1708 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1709 return -EINVAL; 1710 1711 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1712 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1713 return -EEXIST; 1714 pfk->registered |= (1<<hdr->sadb_msg_satype); 1715 } 1716 1717 mutex_lock(&pfkey_mutex); 1718 xfrm_probe_algs(); 1719 1720 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); 1721 mutex_unlock(&pfkey_mutex); 1722 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 if ((xfilter->sadb_x_filter_splen > 1869 (sizeof(xfrm_address_t) << 3)) || 1870 (xfilter->sadb_x_filter_dplen > 1871 (sizeof(xfrm_address_t) << 3))) { 1872 mutex_unlock(&pfk->dump_lock); 1873 return -EINVAL; 1874 } 1875 filter = kmalloc_obj(*filter); 1876 if (filter == NULL) { 1877 mutex_unlock(&pfk->dump_lock); 1878 return -ENOMEM; 1879 } 1880 1881 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1882 sizeof(xfrm_address_t)); 1883 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1884 sizeof(xfrm_address_t)); 1885 filter->family = xfilter->sadb_x_filter_family; 1886 filter->splen = xfilter->sadb_x_filter_splen; 1887 filter->dplen = xfilter->sadb_x_filter_dplen; 1888 } 1889 1890 pfk->dump.msg_version = hdr->sadb_msg_version; 1891 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1892 pfk->dump.dump = pfkey_dump_sa; 1893 pfk->dump.done = pfkey_dump_sa_done; 1894 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1895 mutex_unlock(&pfk->dump_lock); 1896 1897 return pfkey_do_dump(pfk); 1898 } 1899 1900 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1901 { 1902 struct pfkey_sock *pfk = pfkey_sk(sk); 1903 int satype = hdr->sadb_msg_satype; 1904 bool reset_errno = false; 1905 1906 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1907 reset_errno = true; 1908 if (satype != 0 && satype != 1) 1909 return -EINVAL; 1910 pfk->promisc = satype; 1911 } 1912 if (reset_errno && skb_cloned(skb)) 1913 skb = skb_copy(skb, GFP_KERNEL); 1914 else 1915 skb = skb_clone(skb, GFP_KERNEL); 1916 1917 if (reset_errno && skb) { 1918 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1919 new_hdr->sadb_msg_errno = 0; 1920 } 1921 1922 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1923 return 0; 1924 } 1925 1926 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1927 { 1928 int i; 1929 u32 reqid = *(u32*)ptr; 1930 1931 for (i=0; i<xp->xfrm_nr; i++) { 1932 if (xp->xfrm_vec[i].reqid == reqid) 1933 return -EEXIST; 1934 } 1935 return 0; 1936 } 1937 1938 static u32 gen_reqid(struct net *net) 1939 { 1940 struct xfrm_policy_walk walk; 1941 u32 start; 1942 int rc; 1943 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1944 1945 start = reqid; 1946 do { 1947 ++reqid; 1948 if (reqid == 0) 1949 reqid = IPSEC_MANUAL_REQID_MAX+1; 1950 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1951 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1952 xfrm_policy_walk_done(&walk, net); 1953 if (rc != -EEXIST) 1954 return reqid; 1955 } while (reqid != start); 1956 return 0; 1957 } 1958 1959 static int 1960 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol, 1961 struct sadb_x_ipsecrequest *rq) 1962 { 1963 struct net *net = xp_net(xp); 1964 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1965 int mode; 1966 1967 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1968 return -ELOOP; 1969 1970 if (rq->sadb_x_ipsecrequest_mode == 0) 1971 return -EINVAL; 1972 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1973 return -EINVAL; 1974 1975 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1976 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1977 return -EINVAL; 1978 t->mode = mode; 1979 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) { 1980 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) && 1981 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND) 1982 return -EINVAL; 1983 t->optional = 1; 1984 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1985 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1986 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1987 t->reqid = 0; 1988 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1989 return -ENOBUFS; 1990 } 1991 1992 /* addresses present only in tunnel mode */ 1993 if (t->mode == XFRM_MODE_TUNNEL) { 1994 int err; 1995 1996 err = parse_sockaddr_pair( 1997 (struct sockaddr *)(rq + 1), 1998 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1999 &t->saddr, &t->id.daddr, &t->encap_family); 2000 if (err) 2001 return err; 2002 } else 2003 t->encap_family = xp->family; 2004 2005 /* No way to set this via kame pfkey */ 2006 t->allalgs = 1; 2007 xp->xfrm_nr++; 2008 return 0; 2009 } 2010 2011 static int 2012 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 2013 { 2014 int err; 2015 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 2016 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 2017 2018 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 2019 return -EINVAL; 2020 2021 while (len >= sizeof(*rq)) { 2022 if (len < rq->sadb_x_ipsecrequest_len || 2023 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2024 return -EINVAL; 2025 2026 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0) 2027 return err; 2028 len -= rq->sadb_x_ipsecrequest_len; 2029 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2030 } 2031 return 0; 2032 } 2033 2034 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2035 { 2036 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2037 2038 if (xfrm_ctx) { 2039 int len = sizeof(struct sadb_x_sec_ctx); 2040 len += xfrm_ctx->ctx_len; 2041 return PFKEY_ALIGN8(len); 2042 } 2043 return 0; 2044 } 2045 2046 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2047 { 2048 const struct xfrm_tmpl *t; 2049 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2050 int socklen = 0; 2051 int i; 2052 2053 for (i=0; i<xp->xfrm_nr; i++) { 2054 t = xp->xfrm_vec + i; 2055 socklen += pfkey_sockaddr_len(t->encap_family); 2056 } 2057 2058 return sizeof(struct sadb_msg) + 2059 (sizeof(struct sadb_lifetime) * 3) + 2060 (sizeof(struct sadb_address) * 2) + 2061 (sockaddr_size * 2) + 2062 sizeof(struct sadb_x_policy) + 2063 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2064 (socklen * 2) + 2065 pfkey_xfrm_policy2sec_ctx_size(xp); 2066 } 2067 2068 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2069 { 2070 struct sk_buff *skb; 2071 int size; 2072 2073 size = pfkey_xfrm_policy2msg_size(xp); 2074 2075 skb = alloc_skb(size + 16, GFP_ATOMIC); 2076 if (skb == NULL) 2077 return ERR_PTR(-ENOBUFS); 2078 2079 return skb; 2080 } 2081 2082 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2083 { 2084 struct sadb_msg *hdr; 2085 struct sadb_address *addr; 2086 struct sadb_lifetime *lifetime; 2087 struct sadb_x_policy *pol; 2088 struct sadb_x_sec_ctx *sec_ctx; 2089 struct xfrm_sec_ctx *xfrm_ctx; 2090 int i; 2091 int size; 2092 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2093 int socklen = pfkey_sockaddr_len(xp->family); 2094 2095 size = pfkey_xfrm_policy2msg_size(xp); 2096 2097 /* call should fill header later */ 2098 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2099 memset(hdr, 0, size); /* XXX do we need this ? */ 2100 2101 /* src address */ 2102 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2103 addr->sadb_address_len = 2104 (sizeof(struct sadb_address)+sockaddr_size)/ 2105 sizeof(uint64_t); 2106 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2107 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2108 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2109 addr->sadb_address_reserved = 0; 2110 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2111 xp->selector.sport, 2112 (struct sockaddr *) (addr + 1), 2113 xp->family)) 2114 BUG(); 2115 2116 /* dst address */ 2117 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2118 addr->sadb_address_len = 2119 (sizeof(struct sadb_address)+sockaddr_size)/ 2120 sizeof(uint64_t); 2121 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2122 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2123 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2124 addr->sadb_address_reserved = 0; 2125 2126 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2127 (struct sockaddr *) (addr + 1), 2128 xp->family); 2129 2130 /* hard time */ 2131 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2132 lifetime->sadb_lifetime_len = 2133 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2134 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2135 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2136 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2137 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2138 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2139 /* soft time */ 2140 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2141 lifetime->sadb_lifetime_len = 2142 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2143 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2144 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2145 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2146 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2147 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2148 /* current time */ 2149 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2150 lifetime->sadb_lifetime_len = 2151 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2152 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2153 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2154 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2155 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2156 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2157 2158 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2159 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2160 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2161 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2162 if (xp->action == XFRM_POLICY_ALLOW) { 2163 if (xp->xfrm_nr) 2164 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2165 else 2166 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2167 } 2168 pol->sadb_x_policy_dir = dir+1; 2169 pol->sadb_x_policy_reserved = 0; 2170 pol->sadb_x_policy_id = xp->index; 2171 pol->sadb_x_policy_priority = xp->priority; 2172 2173 for (i=0; i<xp->xfrm_nr; i++) { 2174 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2175 struct sadb_x_ipsecrequest *rq; 2176 int req_size; 2177 int mode; 2178 2179 req_size = sizeof(struct sadb_x_ipsecrequest); 2180 if (t->mode == XFRM_MODE_TUNNEL) { 2181 socklen = pfkey_sockaddr_len(t->encap_family); 2182 req_size += socklen * 2; 2183 } else { 2184 size -= 2*socklen; 2185 } 2186 rq = skb_put(skb, req_size); 2187 pol->sadb_x_policy_len += req_size/8; 2188 memset(rq, 0, sizeof(*rq)); 2189 rq->sadb_x_ipsecrequest_len = req_size; 2190 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2191 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2192 return -EINVAL; 2193 rq->sadb_x_ipsecrequest_mode = mode; 2194 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2195 if (t->reqid) 2196 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2197 if (t->optional) 2198 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2199 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2200 2201 if (t->mode == XFRM_MODE_TUNNEL) { 2202 u8 *sa = (void *)(rq + 1); 2203 pfkey_sockaddr_fill(&t->saddr, 0, 2204 (struct sockaddr *)sa, 2205 t->encap_family); 2206 pfkey_sockaddr_fill(&t->id.daddr, 0, 2207 (struct sockaddr *) (sa + socklen), 2208 t->encap_family); 2209 } 2210 } 2211 2212 /* security context */ 2213 if ((xfrm_ctx = xp->security)) { 2214 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2215 2216 sec_ctx = skb_put(skb, ctx_size); 2217 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2218 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2219 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2220 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2221 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2222 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2223 xfrm_ctx->ctx_len); 2224 } 2225 2226 hdr->sadb_msg_len = size / sizeof(uint64_t); 2227 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2228 2229 return 0; 2230 } 2231 2232 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2233 { 2234 struct sk_buff *out_skb; 2235 struct sadb_msg *out_hdr; 2236 int err; 2237 2238 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2239 if (IS_ERR(out_skb)) 2240 return PTR_ERR(out_skb); 2241 2242 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2243 if (err < 0) { 2244 kfree_skb(out_skb); 2245 return err; 2246 } 2247 2248 out_hdr = (struct sadb_msg *) out_skb->data; 2249 out_hdr->sadb_msg_version = PF_KEY_V2; 2250 2251 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2252 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2253 else 2254 out_hdr->sadb_msg_type = event2poltype(c->event); 2255 out_hdr->sadb_msg_errno = 0; 2256 out_hdr->sadb_msg_seq = c->seq; 2257 out_hdr->sadb_msg_pid = c->portid; 2258 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2259 return 0; 2260 2261 } 2262 2263 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2264 { 2265 struct net *net = sock_net(sk); 2266 int err = 0; 2267 struct sadb_lifetime *lifetime; 2268 struct sadb_address *sa; 2269 struct sadb_x_policy *pol; 2270 struct xfrm_policy *xp; 2271 struct km_event c; 2272 struct sadb_x_sec_ctx *sec_ctx; 2273 2274 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2275 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2276 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2277 return -EINVAL; 2278 2279 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2280 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2281 return -EINVAL; 2282 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2283 return -EINVAL; 2284 2285 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2286 if (xp == NULL) 2287 return -ENOBUFS; 2288 2289 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2290 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2291 xp->priority = pol->sadb_x_policy_priority; 2292 2293 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2294 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2295 xp->selector.family = xp->family; 2296 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2297 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2298 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2299 if (xp->selector.sport) 2300 xp->selector.sport_mask = htons(0xffff); 2301 2302 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2303 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2304 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2305 2306 /* Amusing, we set this twice. KAME apps appear to set same value 2307 * in both addresses. 2308 */ 2309 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2310 2311 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2312 if (xp->selector.dport) 2313 xp->selector.dport_mask = htons(0xffff); 2314 2315 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2316 if (sec_ctx != NULL) { 2317 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2318 2319 if (!uctx) { 2320 err = -ENOBUFS; 2321 goto out; 2322 } 2323 2324 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2325 kfree(uctx); 2326 2327 if (err) 2328 goto out; 2329 } 2330 2331 xp->lft.soft_byte_limit = XFRM_INF; 2332 xp->lft.hard_byte_limit = XFRM_INF; 2333 xp->lft.soft_packet_limit = XFRM_INF; 2334 xp->lft.hard_packet_limit = XFRM_INF; 2335 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2336 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2337 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2338 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2339 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2340 } 2341 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2342 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2343 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2344 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2345 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2346 } 2347 xp->xfrm_nr = 0; 2348 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2349 (err = parse_ipsecrequests(xp, pol)) < 0) 2350 goto out; 2351 2352 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2353 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2354 2355 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2356 2357 if (err) 2358 goto out; 2359 2360 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2361 c.event = XFRM_MSG_UPDPOLICY; 2362 else 2363 c.event = XFRM_MSG_NEWPOLICY; 2364 2365 c.seq = hdr->sadb_msg_seq; 2366 c.portid = hdr->sadb_msg_pid; 2367 2368 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2369 xfrm_pol_put(xp); 2370 return 0; 2371 2372 out: 2373 xp->walk.dead = 1; 2374 xfrm_policy_destroy(xp); 2375 return err; 2376 } 2377 2378 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2379 { 2380 struct net *net = sock_net(sk); 2381 int err; 2382 struct sadb_address *sa; 2383 struct sadb_x_policy *pol; 2384 struct xfrm_policy *xp; 2385 struct xfrm_selector sel; 2386 struct km_event c; 2387 struct sadb_x_sec_ctx *sec_ctx; 2388 struct xfrm_sec_ctx *pol_ctx = NULL; 2389 2390 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2391 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2392 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2393 return -EINVAL; 2394 2395 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2396 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2397 return -EINVAL; 2398 2399 memset(&sel, 0, sizeof(sel)); 2400 2401 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2402 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2403 sel.prefixlen_s = sa->sadb_address_prefixlen; 2404 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2405 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2406 if (sel.sport) 2407 sel.sport_mask = htons(0xffff); 2408 2409 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2410 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2411 sel.prefixlen_d = sa->sadb_address_prefixlen; 2412 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2413 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2414 if (sel.dport) 2415 sel.dport_mask = htons(0xffff); 2416 2417 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2418 if (sec_ctx != NULL) { 2419 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2420 2421 if (!uctx) 2422 return -ENOMEM; 2423 2424 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2425 kfree(uctx); 2426 if (err) 2427 return err; 2428 } 2429 2430 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2431 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2432 1, &err); 2433 security_xfrm_policy_free(pol_ctx); 2434 if (xp == NULL) 2435 return -ENOENT; 2436 2437 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2438 2439 if (err) 2440 goto out; 2441 2442 c.seq = hdr->sadb_msg_seq; 2443 c.portid = hdr->sadb_msg_pid; 2444 c.data.byid = 0; 2445 c.event = XFRM_MSG_DELPOLICY; 2446 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2447 2448 out: 2449 xfrm_pol_put(xp); 2450 return err; 2451 } 2452 2453 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2454 { 2455 int err; 2456 struct sk_buff *out_skb; 2457 struct sadb_msg *out_hdr; 2458 err = 0; 2459 2460 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2461 if (IS_ERR(out_skb)) { 2462 err = PTR_ERR(out_skb); 2463 goto out; 2464 } 2465 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2466 if (err < 0) { 2467 kfree_skb(out_skb); 2468 goto out; 2469 } 2470 2471 out_hdr = (struct sadb_msg *) out_skb->data; 2472 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2473 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2474 out_hdr->sadb_msg_satype = 0; 2475 out_hdr->sadb_msg_errno = 0; 2476 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2477 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2478 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2479 err = 0; 2480 2481 out: 2482 return err; 2483 } 2484 2485 static int pfkey_sockaddr_pair_size(sa_family_t family) 2486 { 2487 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2488 } 2489 2490 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2491 xfrm_address_t *saddr, xfrm_address_t *daddr, 2492 u16 *family) 2493 { 2494 int af, socklen; 2495 2496 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2497 return -EINVAL; 2498 2499 af = pfkey_sockaddr_extract(sa, saddr); 2500 if (!af) 2501 return -EINVAL; 2502 2503 socklen = pfkey_sockaddr_len(af); 2504 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2505 daddr) != af) 2506 return -EINVAL; 2507 2508 *family = af; 2509 return 0; 2510 } 2511 2512 #ifdef CONFIG_NET_KEY_MIGRATE 2513 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2514 struct xfrm_migrate *m) 2515 { 2516 int err; 2517 struct sadb_x_ipsecrequest *rq2; 2518 int mode; 2519 2520 if (len < sizeof(*rq1) || 2521 len < rq1->sadb_x_ipsecrequest_len || 2522 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2523 return -EINVAL; 2524 2525 /* old endoints */ 2526 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2527 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2528 &m->old_saddr, &m->old_daddr, 2529 &m->old_family); 2530 if (err) 2531 return err; 2532 2533 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2534 len -= rq1->sadb_x_ipsecrequest_len; 2535 2536 if (len <= sizeof(*rq2) || 2537 len < rq2->sadb_x_ipsecrequest_len || 2538 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2539 return -EINVAL; 2540 2541 /* new endpoints */ 2542 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2543 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2544 &m->new_saddr, &m->new_daddr, 2545 &m->new_family); 2546 if (err) 2547 return err; 2548 2549 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2550 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2551 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2552 return -EINVAL; 2553 2554 m->proto = rq1->sadb_x_ipsecrequest_proto; 2555 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2556 return -EINVAL; 2557 m->mode = mode; 2558 m->old_reqid = rq1->sadb_x_ipsecrequest_reqid; 2559 2560 return ((int)(rq1->sadb_x_ipsecrequest_len + 2561 rq2->sadb_x_ipsecrequest_len)); 2562 } 2563 2564 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2565 const struct sadb_msg *hdr, void * const *ext_hdrs) 2566 { 2567 int i, len, ret, err = -EINVAL; 2568 u8 dir; 2569 struct sadb_address *sa; 2570 struct sadb_x_kmaddress *kma; 2571 struct sadb_x_policy *pol; 2572 struct sadb_x_ipsecrequest *rq; 2573 struct xfrm_selector sel; 2574 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2575 struct xfrm_kmaddress k; 2576 struct net *net = sock_net(sk); 2577 2578 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2579 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2580 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2581 err = -EINVAL; 2582 goto out; 2583 } 2584 2585 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2586 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2587 2588 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2589 err = -EINVAL; 2590 goto out; 2591 } 2592 2593 if (kma) { 2594 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2595 k.reserved = kma->sadb_x_kmaddress_reserved; 2596 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2597 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2598 &k.local, &k.remote, &k.family); 2599 if (ret < 0) { 2600 err = ret; 2601 goto out; 2602 } 2603 } 2604 2605 dir = pol->sadb_x_policy_dir - 1; 2606 memset(&sel, 0, sizeof(sel)); 2607 2608 /* set source address info of selector */ 2609 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2610 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2611 sel.prefixlen_s = sa->sadb_address_prefixlen; 2612 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2613 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2614 if (sel.sport) 2615 sel.sport_mask = htons(0xffff); 2616 2617 /* set destination address info of selector */ 2618 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2619 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2620 sel.prefixlen_d = sa->sadb_address_prefixlen; 2621 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2622 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2623 if (sel.dport) 2624 sel.dport_mask = htons(0xffff); 2625 2626 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2627 2628 /* extract ipsecrequests */ 2629 i = 0; 2630 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2631 2632 while (len > 0 && i < XFRM_MAX_DEPTH) { 2633 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2634 if (ret < 0) { 2635 err = ret; 2636 goto out; 2637 } else { 2638 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2639 len -= ret; 2640 i++; 2641 } 2642 } 2643 2644 if (!i || len > 0) { 2645 err = -EINVAL; 2646 goto out; 2647 } 2648 2649 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2650 kma ? &k : NULL, net, NULL, 0, NULL, NULL); 2651 2652 out: 2653 return err; 2654 } 2655 #else 2656 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2657 const struct sadb_msg *hdr, void * const *ext_hdrs) 2658 { 2659 return -ENOPROTOOPT; 2660 } 2661 #endif 2662 2663 2664 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2665 { 2666 struct net *net = sock_net(sk); 2667 unsigned int dir; 2668 int err = 0, delete; 2669 struct sadb_x_policy *pol; 2670 struct xfrm_policy *xp; 2671 struct km_event c; 2672 2673 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2674 return -EINVAL; 2675 2676 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2677 if (dir >= XFRM_POLICY_MAX) 2678 return -EINVAL; 2679 2680 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2681 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2682 dir, pol->sadb_x_policy_id, delete, &err); 2683 if (xp == NULL) 2684 return -ENOENT; 2685 2686 if (delete) { 2687 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2688 2689 if (err) 2690 goto out; 2691 c.seq = hdr->sadb_msg_seq; 2692 c.portid = hdr->sadb_msg_pid; 2693 c.data.byid = 1; 2694 c.event = XFRM_MSG_DELPOLICY; 2695 km_policy_notify(xp, dir, &c); 2696 } else { 2697 err = key_pol_get_resp(sk, xp, hdr, dir); 2698 } 2699 2700 out: 2701 xfrm_pol_put(xp); 2702 return err; 2703 } 2704 2705 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2706 { 2707 struct pfkey_sock *pfk = ptr; 2708 struct sk_buff *out_skb; 2709 struct sadb_msg *out_hdr; 2710 int err; 2711 2712 if (!pfkey_can_dump(&pfk->sk)) 2713 return -ENOBUFS; 2714 2715 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2716 if (IS_ERR(out_skb)) 2717 return PTR_ERR(out_skb); 2718 2719 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2720 if (err < 0) { 2721 kfree_skb(out_skb); 2722 return err; 2723 } 2724 2725 out_hdr = (struct sadb_msg *) out_skb->data; 2726 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2727 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2728 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2729 out_hdr->sadb_msg_errno = 0; 2730 out_hdr->sadb_msg_seq = count + 1; 2731 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2732 2733 if (pfk->dump.skb) 2734 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2735 &pfk->sk, sock_net(&pfk->sk)); 2736 pfk->dump.skb = out_skb; 2737 2738 return 0; 2739 } 2740 2741 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2742 { 2743 struct net *net = sock_net(&pfk->sk); 2744 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2745 } 2746 2747 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2748 { 2749 struct net *net = sock_net((struct sock *)pfk); 2750 2751 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2752 } 2753 2754 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2755 { 2756 struct pfkey_sock *pfk = pfkey_sk(sk); 2757 2758 mutex_lock(&pfk->dump_lock); 2759 if (pfk->dump.dump != NULL) { 2760 mutex_unlock(&pfk->dump_lock); 2761 return -EBUSY; 2762 } 2763 2764 pfk->dump.msg_version = hdr->sadb_msg_version; 2765 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2766 pfk->dump.dump = pfkey_dump_sp; 2767 pfk->dump.done = pfkey_dump_sp_done; 2768 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2769 mutex_unlock(&pfk->dump_lock); 2770 2771 return pfkey_do_dump(pfk); 2772 } 2773 2774 static int key_notify_policy_flush(const struct km_event *c) 2775 { 2776 struct sk_buff *skb_out; 2777 struct sadb_msg *hdr; 2778 2779 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2780 if (!skb_out) 2781 return -ENOBUFS; 2782 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2783 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2784 hdr->sadb_msg_seq = c->seq; 2785 hdr->sadb_msg_pid = c->portid; 2786 hdr->sadb_msg_version = PF_KEY_V2; 2787 hdr->sadb_msg_errno = (uint8_t) 0; 2788 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2789 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2790 hdr->sadb_msg_reserved = 0; 2791 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2792 return 0; 2793 2794 } 2795 2796 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2797 { 2798 struct net *net = sock_net(sk); 2799 struct km_event c; 2800 int err, err2; 2801 2802 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2803 err2 = unicast_flush_resp(sk, hdr); 2804 if (err || err2) { 2805 if (err == -ESRCH) /* empty table - old silent behavior */ 2806 return 0; 2807 return err; 2808 } 2809 2810 c.data.type = XFRM_POLICY_TYPE_MAIN; 2811 c.event = XFRM_MSG_FLUSHPOLICY; 2812 c.portid = hdr->sadb_msg_pid; 2813 c.seq = hdr->sadb_msg_seq; 2814 c.net = net; 2815 km_policy_notify(NULL, 0, &c); 2816 2817 return 0; 2818 } 2819 2820 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2821 const struct sadb_msg *hdr, void * const *ext_hdrs); 2822 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2823 [SADB_RESERVED] = pfkey_reserved, 2824 [SADB_GETSPI] = pfkey_getspi, 2825 [SADB_UPDATE] = pfkey_add, 2826 [SADB_ADD] = pfkey_add, 2827 [SADB_DELETE] = pfkey_delete, 2828 [SADB_GET] = pfkey_get, 2829 [SADB_ACQUIRE] = pfkey_acquire, 2830 [SADB_REGISTER] = pfkey_register, 2831 [SADB_EXPIRE] = NULL, 2832 [SADB_FLUSH] = pfkey_flush, 2833 [SADB_DUMP] = pfkey_dump, 2834 [SADB_X_PROMISC] = pfkey_promisc, 2835 [SADB_X_PCHANGE] = NULL, 2836 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2837 [SADB_X_SPDADD] = pfkey_spdadd, 2838 [SADB_X_SPDDELETE] = pfkey_spddelete, 2839 [SADB_X_SPDGET] = pfkey_spdget, 2840 [SADB_X_SPDACQUIRE] = NULL, 2841 [SADB_X_SPDDUMP] = pfkey_spddump, 2842 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2843 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2844 [SADB_X_SPDDELETE2] = pfkey_spdget, 2845 [SADB_X_MIGRATE] = pfkey_migrate, 2846 }; 2847 2848 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2849 { 2850 void *ext_hdrs[SADB_EXT_MAX]; 2851 int err; 2852 2853 /* Non-zero return value of pfkey_broadcast() does not always signal 2854 * an error and even on an actual error we may still want to process 2855 * the message so rather ignore the return value. 2856 */ 2857 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2858 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2859 2860 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2861 err = parse_exthdrs(skb, hdr, ext_hdrs); 2862 if (!err) { 2863 err = -EOPNOTSUPP; 2864 if (pfkey_funcs[hdr->sadb_msg_type]) 2865 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2866 } 2867 return err; 2868 } 2869 2870 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2871 { 2872 struct sadb_msg *hdr = NULL; 2873 2874 if (skb->len < sizeof(*hdr)) { 2875 *errp = -EMSGSIZE; 2876 } else { 2877 hdr = (struct sadb_msg *) skb->data; 2878 if (hdr->sadb_msg_version != PF_KEY_V2 || 2879 hdr->sadb_msg_reserved != 0 || 2880 (hdr->sadb_msg_type <= SADB_RESERVED || 2881 hdr->sadb_msg_type > SADB_MAX)) { 2882 hdr = NULL; 2883 *errp = -EINVAL; 2884 } else if (hdr->sadb_msg_len != (skb->len / 2885 sizeof(uint64_t)) || 2886 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2887 sizeof(uint64_t))) { 2888 hdr = NULL; 2889 *errp = -EMSGSIZE; 2890 } else { 2891 *errp = 0; 2892 } 2893 } 2894 return hdr; 2895 } 2896 2897 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2898 const struct xfrm_algo_desc *d) 2899 { 2900 unsigned int id = d->desc.sadb_alg_id; 2901 2902 if (id >= sizeof(t->aalgos) * 8) 2903 return 0; 2904 2905 return (t->aalgos >> id) & 1; 2906 } 2907 2908 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2909 const struct xfrm_algo_desc *d) 2910 { 2911 unsigned int id = d->desc.sadb_alg_id; 2912 2913 if (id >= sizeof(t->ealgos) * 8) 2914 return 0; 2915 2916 return (t->ealgos >> id) & 1; 2917 } 2918 2919 static int count_ah_combs(const struct xfrm_tmpl *t) 2920 { 2921 int i, sz = 0; 2922 2923 for (i = 0; ; i++) { 2924 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2925 if (!aalg) 2926 break; 2927 if (!aalg->pfkey_supported) 2928 continue; 2929 if (aalg_tmpl_set(t, aalg)) 2930 sz += sizeof(struct sadb_comb); 2931 } 2932 return sz + sizeof(struct sadb_prop); 2933 } 2934 2935 static int count_esp_combs(const struct xfrm_tmpl *t) 2936 { 2937 int i, k, sz = 0; 2938 2939 for (i = 0; ; i++) { 2940 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2941 if (!ealg) 2942 break; 2943 2944 if (!ealg->pfkey_supported) 2945 continue; 2946 2947 if (!(ealg_tmpl_set(t, ealg))) 2948 continue; 2949 2950 for (k = 1; ; k++) { 2951 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2952 if (!aalg) 2953 break; 2954 2955 if (!aalg->pfkey_supported) 2956 continue; 2957 2958 if (aalg_tmpl_set(t, aalg)) 2959 sz += sizeof(struct sadb_comb); 2960 } 2961 } 2962 return sz + sizeof(struct sadb_prop); 2963 } 2964 2965 static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2966 { 2967 struct sadb_prop *p; 2968 int sz = 0; 2969 int i; 2970 2971 p = skb_put(skb, sizeof(struct sadb_prop)); 2972 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2973 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2974 p->sadb_prop_replay = 32; 2975 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2976 2977 for (i = 0; ; i++) { 2978 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2979 if (!aalg) 2980 break; 2981 2982 if (!aalg->pfkey_supported) 2983 continue; 2984 2985 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2986 struct sadb_comb *c; 2987 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2988 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2989 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2990 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2991 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2992 c->sadb_comb_hard_addtime = 24*60*60; 2993 c->sadb_comb_soft_addtime = 20*60*60; 2994 c->sadb_comb_hard_usetime = 8*60*60; 2995 c->sadb_comb_soft_usetime = 7*60*60; 2996 sz += sizeof(*c); 2997 } 2998 } 2999 3000 return sz + sizeof(*p); 3001 } 3002 3003 static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 3004 { 3005 struct sadb_prop *p; 3006 int sz = 0; 3007 int i, k; 3008 3009 p = skb_put(skb, sizeof(struct sadb_prop)); 3010 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 3011 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 3012 p->sadb_prop_replay = 32; 3013 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 3014 3015 for (i=0; ; i++) { 3016 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 3017 if (!ealg) 3018 break; 3019 3020 if (!ealg->pfkey_supported) 3021 continue; 3022 3023 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 3024 continue; 3025 3026 for (k = 1; ; k++) { 3027 struct sadb_comb *c; 3028 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3029 if (!aalg) 3030 break; 3031 if (!aalg->pfkey_supported) 3032 continue; 3033 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3034 continue; 3035 c = skb_put(skb, sizeof(struct sadb_comb)); 3036 memset(c, 0, sizeof(*c)); 3037 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3038 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3039 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3040 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3041 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3042 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3043 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3044 c->sadb_comb_hard_addtime = 24*60*60; 3045 c->sadb_comb_soft_addtime = 20*60*60; 3046 c->sadb_comb_hard_usetime = 8*60*60; 3047 c->sadb_comb_soft_usetime = 7*60*60; 3048 sz += sizeof(*c); 3049 } 3050 } 3051 3052 return sz + sizeof(*p); 3053 } 3054 3055 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3056 { 3057 return 0; 3058 } 3059 3060 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3061 { 3062 struct sk_buff *out_skb; 3063 struct sadb_msg *out_hdr; 3064 int hard; 3065 int hsc; 3066 3067 hard = c->data.hard; 3068 if (hard) 3069 hsc = 2; 3070 else 3071 hsc = 1; 3072 3073 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3074 if (IS_ERR(out_skb)) 3075 return PTR_ERR(out_skb); 3076 3077 out_hdr = (struct sadb_msg *) out_skb->data; 3078 out_hdr->sadb_msg_version = PF_KEY_V2; 3079 out_hdr->sadb_msg_type = SADB_EXPIRE; 3080 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3081 out_hdr->sadb_msg_errno = 0; 3082 out_hdr->sadb_msg_reserved = 0; 3083 out_hdr->sadb_msg_seq = 0; 3084 out_hdr->sadb_msg_pid = 0; 3085 3086 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3087 xs_net(x)); 3088 return 0; 3089 } 3090 3091 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3092 { 3093 struct net *net = x ? xs_net(x) : c->net; 3094 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3095 3096 if (atomic_read(&net_pfkey->socks_nr) == 0) 3097 return 0; 3098 3099 switch (c->event) { 3100 case XFRM_MSG_EXPIRE: 3101 return key_notify_sa_expire(x, c); 3102 case XFRM_MSG_DELSA: 3103 case XFRM_MSG_NEWSA: 3104 case XFRM_MSG_UPDSA: 3105 return key_notify_sa(x, c); 3106 case XFRM_MSG_FLUSHSA: 3107 return key_notify_sa_flush(c); 3108 case XFRM_MSG_NEWAE: /* not yet supported */ 3109 break; 3110 default: 3111 pr_err("pfkey: Unknown SA event %d\n", c->event); 3112 break; 3113 } 3114 3115 return 0; 3116 } 3117 3118 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3119 { 3120 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3121 return 0; 3122 3123 switch (c->event) { 3124 case XFRM_MSG_POLEXPIRE: 3125 return key_notify_policy_expire(xp, c); 3126 case XFRM_MSG_DELPOLICY: 3127 case XFRM_MSG_NEWPOLICY: 3128 case XFRM_MSG_UPDPOLICY: 3129 return key_notify_policy(xp, dir, c); 3130 case XFRM_MSG_FLUSHPOLICY: 3131 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3132 break; 3133 return key_notify_policy_flush(c); 3134 default: 3135 pr_err("pfkey: Unknown policy event %d\n", c->event); 3136 break; 3137 } 3138 3139 return 0; 3140 } 3141 3142 static u32 get_acqseq(void) 3143 { 3144 u32 res; 3145 static atomic_t acqseq; 3146 3147 do { 3148 res = atomic_inc_return(&acqseq); 3149 } while (!res); 3150 return res; 3151 } 3152 3153 static bool pfkey_is_alive(const struct km_event *c) 3154 { 3155 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3156 struct sock *sk; 3157 bool is_alive = false; 3158 3159 rcu_read_lock(); 3160 sk_for_each_rcu(sk, &net_pfkey->table) { 3161 if (pfkey_sk(sk)->registered) { 3162 is_alive = true; 3163 break; 3164 } 3165 } 3166 rcu_read_unlock(); 3167 3168 return is_alive; 3169 } 3170 3171 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3172 { 3173 struct sk_buff *skb; 3174 struct sadb_msg *hdr; 3175 struct sadb_address *addr; 3176 struct sadb_x_policy *pol; 3177 int sockaddr_size; 3178 int size; 3179 struct sadb_x_sec_ctx *sec_ctx; 3180 struct xfrm_sec_ctx *xfrm_ctx; 3181 int ctx_size = 0; 3182 int alg_size = 0; 3183 3184 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3185 if (!sockaddr_size) 3186 return -EINVAL; 3187 3188 size = sizeof(struct sadb_msg) + 3189 (sizeof(struct sadb_address) * 2) + 3190 (sockaddr_size * 2) + 3191 sizeof(struct sadb_x_policy); 3192 3193 if (x->id.proto == IPPROTO_AH) 3194 alg_size = count_ah_combs(t); 3195 else if (x->id.proto == IPPROTO_ESP) 3196 alg_size = count_esp_combs(t); 3197 3198 if ((xfrm_ctx = x->security)) { 3199 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3200 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3201 } 3202 3203 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC); 3204 if (skb == NULL) 3205 return -ENOMEM; 3206 3207 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3208 hdr->sadb_msg_version = PF_KEY_V2; 3209 hdr->sadb_msg_type = SADB_ACQUIRE; 3210 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3211 hdr->sadb_msg_len = size / sizeof(uint64_t); 3212 hdr->sadb_msg_errno = 0; 3213 hdr->sadb_msg_reserved = 0; 3214 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3215 hdr->sadb_msg_pid = 0; 3216 3217 /* src address */ 3218 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3219 addr->sadb_address_len = 3220 (sizeof(struct sadb_address)+sockaddr_size)/ 3221 sizeof(uint64_t); 3222 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3223 addr->sadb_address_proto = 0; 3224 addr->sadb_address_reserved = 0; 3225 addr->sadb_address_prefixlen = 3226 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0, 3227 (struct sockaddr *)(addr + 1), 3228 x->props.family); 3229 if (!addr->sadb_address_prefixlen) 3230 BUG(); 3231 3232 /* dst address */ 3233 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3234 addr->sadb_address_len = 3235 (sizeof(struct sadb_address)+sockaddr_size)/ 3236 sizeof(uint64_t); 3237 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3238 addr->sadb_address_proto = 0; 3239 addr->sadb_address_reserved = 0; 3240 addr->sadb_address_prefixlen = 3241 pfkey_sockaddr_fill_zero_tail(&x->id.daddr, 0, 3242 (struct sockaddr *)(addr + 1), 3243 x->props.family); 3244 if (!addr->sadb_address_prefixlen) 3245 BUG(); 3246 3247 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3248 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3249 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3250 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3251 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3252 pol->sadb_x_policy_reserved = 0; 3253 pol->sadb_x_policy_id = xp->index; 3254 pol->sadb_x_policy_priority = xp->priority; 3255 3256 /* Set sadb_comb's. */ 3257 alg_size = 0; 3258 if (x->id.proto == IPPROTO_AH) 3259 alg_size = dump_ah_combs(skb, t); 3260 else if (x->id.proto == IPPROTO_ESP) 3261 alg_size = dump_esp_combs(skb, t); 3262 3263 hdr->sadb_msg_len += alg_size / 8; 3264 3265 /* security context */ 3266 if (xfrm_ctx) { 3267 sec_ctx = skb_put(skb, 3268 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3269 sec_ctx->sadb_x_sec_len = 3270 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3271 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3272 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3273 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3274 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3275 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3276 xfrm_ctx->ctx_len); 3277 } 3278 3279 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3280 xs_net(x)); 3281 } 3282 3283 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3284 u8 *data, int len, int *dir) 3285 { 3286 struct net *net = sock_net(sk); 3287 struct xfrm_policy *xp; 3288 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3289 struct sadb_x_sec_ctx *sec_ctx; 3290 3291 switch (sk->sk_family) { 3292 case AF_INET: 3293 if (opt != IP_IPSEC_POLICY) { 3294 *dir = -EOPNOTSUPP; 3295 return NULL; 3296 } 3297 break; 3298 #if IS_ENABLED(CONFIG_IPV6) 3299 case AF_INET6: 3300 if (opt != IPV6_IPSEC_POLICY) { 3301 *dir = -EOPNOTSUPP; 3302 return NULL; 3303 } 3304 break; 3305 #endif 3306 default: 3307 *dir = -EINVAL; 3308 return NULL; 3309 } 3310 3311 *dir = -EINVAL; 3312 3313 if (len < sizeof(struct sadb_x_policy) || 3314 pol->sadb_x_policy_len*8 > len || 3315 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3316 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3317 return NULL; 3318 3319 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3320 if (xp == NULL) { 3321 *dir = -ENOBUFS; 3322 return NULL; 3323 } 3324 3325 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3326 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3327 3328 xp->lft.soft_byte_limit = XFRM_INF; 3329 xp->lft.hard_byte_limit = XFRM_INF; 3330 xp->lft.soft_packet_limit = XFRM_INF; 3331 xp->lft.hard_packet_limit = XFRM_INF; 3332 xp->family = sk->sk_family; 3333 3334 xp->xfrm_nr = 0; 3335 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3336 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3337 goto out; 3338 3339 /* security context too */ 3340 if (len >= (pol->sadb_x_policy_len*8 + 3341 sizeof(struct sadb_x_sec_ctx))) { 3342 char *p = (char *)pol; 3343 struct xfrm_user_sec_ctx *uctx; 3344 3345 p += pol->sadb_x_policy_len*8; 3346 sec_ctx = (struct sadb_x_sec_ctx *)p; 3347 if (len < pol->sadb_x_policy_len*8 + 3348 sec_ctx->sadb_x_sec_len*8) { 3349 *dir = -EINVAL; 3350 goto out; 3351 } 3352 if ((*dir = verify_sec_ctx_len(p))) 3353 goto out; 3354 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3355 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3356 kfree(uctx); 3357 3358 if (*dir) 3359 goto out; 3360 } 3361 3362 *dir = pol->sadb_x_policy_dir-1; 3363 return xp; 3364 3365 out: 3366 xp->walk.dead = 1; 3367 xfrm_policy_destroy(xp); 3368 return NULL; 3369 } 3370 3371 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3372 { 3373 struct sk_buff *skb; 3374 struct sadb_msg *hdr; 3375 struct sadb_sa *sa; 3376 struct sadb_address *addr; 3377 struct sadb_x_nat_t_port *n_port; 3378 int sockaddr_size; 3379 int size; 3380 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3381 struct xfrm_encap_tmpl *natt = NULL; 3382 3383 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3384 if (!sockaddr_size) 3385 return -EINVAL; 3386 3387 if (!satype) 3388 return -EINVAL; 3389 3390 if (!x->encap) 3391 return -EINVAL; 3392 3393 natt = x->encap; 3394 3395 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3396 * 3397 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3398 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3399 */ 3400 3401 size = sizeof(struct sadb_msg) + 3402 sizeof(struct sadb_sa) + 3403 (sizeof(struct sadb_address) * 2) + 3404 (sockaddr_size * 2) + 3405 (sizeof(struct sadb_x_nat_t_port) * 2); 3406 3407 skb = alloc_skb(size + 16, GFP_ATOMIC); 3408 if (skb == NULL) 3409 return -ENOMEM; 3410 3411 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3412 hdr->sadb_msg_version = PF_KEY_V2; 3413 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3414 hdr->sadb_msg_satype = satype; 3415 hdr->sadb_msg_len = size / sizeof(uint64_t); 3416 hdr->sadb_msg_errno = 0; 3417 hdr->sadb_msg_reserved = 0; 3418 hdr->sadb_msg_seq = x->km.seq; 3419 hdr->sadb_msg_pid = 0; 3420 3421 /* SA */ 3422 sa = skb_put(skb, sizeof(struct sadb_sa)); 3423 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3424 sa->sadb_sa_exttype = SADB_EXT_SA; 3425 sa->sadb_sa_spi = x->id.spi; 3426 sa->sadb_sa_replay = 0; 3427 sa->sadb_sa_state = 0; 3428 sa->sadb_sa_auth = 0; 3429 sa->sadb_sa_encrypt = 0; 3430 sa->sadb_sa_flags = 0; 3431 3432 /* ADDRESS_SRC (old addr) */ 3433 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3434 addr->sadb_address_len = 3435 (sizeof(struct sadb_address)+sockaddr_size)/ 3436 sizeof(uint64_t); 3437 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3438 addr->sadb_address_proto = 0; 3439 addr->sadb_address_reserved = 0; 3440 addr->sadb_address_prefixlen = 3441 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0, 3442 (struct sockaddr *)(addr + 1), 3443 x->props.family); 3444 if (!addr->sadb_address_prefixlen) 3445 BUG(); 3446 3447 /* NAT_T_SPORT (old port) */ 3448 n_port = skb_put(skb, sizeof(*n_port)); 3449 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3450 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3451 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3452 n_port->sadb_x_nat_t_port_reserved = 0; 3453 3454 /* ADDRESS_DST (new addr) */ 3455 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3456 addr->sadb_address_len = 3457 (sizeof(struct sadb_address)+sockaddr_size)/ 3458 sizeof(uint64_t); 3459 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3460 addr->sadb_address_proto = 0; 3461 addr->sadb_address_reserved = 0; 3462 addr->sadb_address_prefixlen = 3463 pfkey_sockaddr_fill_zero_tail(ipaddr, 0, 3464 (struct sockaddr *)(addr + 1), 3465 x->props.family); 3466 if (!addr->sadb_address_prefixlen) 3467 BUG(); 3468 3469 /* NAT_T_DPORT (new port) */ 3470 n_port = skb_put(skb, sizeof(*n_port)); 3471 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3472 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3473 n_port->sadb_x_nat_t_port_port = sport; 3474 n_port->sadb_x_nat_t_port_reserved = 0; 3475 3476 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3477 xs_net(x)); 3478 } 3479 3480 #ifdef CONFIG_NET_KEY_MIGRATE 3481 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3482 const struct xfrm_selector *sel) 3483 { 3484 struct sadb_address *addr; 3485 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3486 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3487 addr->sadb_address_exttype = type; 3488 addr->sadb_address_proto = sel->proto; 3489 addr->sadb_address_reserved = 0; 3490 3491 switch (type) { 3492 case SADB_EXT_ADDRESS_SRC: 3493 addr->sadb_address_prefixlen = sel->prefixlen_s; 3494 pfkey_sockaddr_fill_zero_tail(&sel->saddr, 0, 3495 (struct sockaddr *)(addr + 1), 3496 sel->family); 3497 break; 3498 case SADB_EXT_ADDRESS_DST: 3499 addr->sadb_address_prefixlen = sel->prefixlen_d; 3500 pfkey_sockaddr_fill_zero_tail(&sel->daddr, 0, 3501 (struct sockaddr *)(addr + 1), 3502 sel->family); 3503 break; 3504 default: 3505 return -EINVAL; 3506 } 3507 3508 return 0; 3509 } 3510 3511 3512 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3513 { 3514 struct sadb_x_kmaddress *kma; 3515 u8 *sa; 3516 int family = k->family; 3517 int socklen = pfkey_sockaddr_len(family); 3518 int size_req; 3519 3520 size_req = (sizeof(struct sadb_x_kmaddress) + 3521 pfkey_sockaddr_pair_size(family)); 3522 3523 kma = skb_put_zero(skb, size_req); 3524 kma->sadb_x_kmaddress_len = size_req / 8; 3525 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3526 kma->sadb_x_kmaddress_reserved = k->reserved; 3527 3528 sa = (u8 *)(kma + 1); 3529 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3530 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3531 return -EINVAL; 3532 3533 return 0; 3534 } 3535 3536 static int set_ipsecrequest(struct sk_buff *skb, 3537 uint8_t proto, uint8_t mode, int level, 3538 uint32_t reqid, sa_family_t family, 3539 const xfrm_address_t *src, const xfrm_address_t *dst) 3540 { 3541 struct sadb_x_ipsecrequest *rq; 3542 u8 *sa; 3543 int socklen = pfkey_sockaddr_len(family); 3544 int size_req; 3545 3546 size_req = sizeof(struct sadb_x_ipsecrequest) + 3547 pfkey_sockaddr_pair_size(family); 3548 3549 rq = skb_put_zero(skb, size_req); 3550 rq->sadb_x_ipsecrequest_len = size_req; 3551 rq->sadb_x_ipsecrequest_proto = proto; 3552 rq->sadb_x_ipsecrequest_mode = mode; 3553 rq->sadb_x_ipsecrequest_level = level; 3554 rq->sadb_x_ipsecrequest_reqid = reqid; 3555 3556 sa = (u8 *) (rq + 1); 3557 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3558 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3559 return -EINVAL; 3560 3561 return 0; 3562 } 3563 #endif 3564 3565 #ifdef CONFIG_NET_KEY_MIGRATE 3566 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3567 const struct xfrm_migrate *m, int num_bundles, 3568 const struct xfrm_kmaddress *k, struct net *net, 3569 const struct xfrm_encap_tmpl *encap) 3570 { 3571 int i; 3572 int sasize_sel; 3573 int size = 0; 3574 int size_pol = 0; 3575 struct sk_buff *skb; 3576 struct sadb_msg *hdr; 3577 struct sadb_x_policy *pol; 3578 const struct xfrm_migrate *mp; 3579 3580 if (type != XFRM_POLICY_TYPE_MAIN) 3581 return 0; 3582 3583 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3584 return -EINVAL; 3585 3586 if (k != NULL) { 3587 /* addresses for KM */ 3588 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3589 pfkey_sockaddr_pair_size(k->family)); 3590 } 3591 3592 /* selector */ 3593 sasize_sel = pfkey_sockaddr_size(sel->family); 3594 if (!sasize_sel) 3595 return -EINVAL; 3596 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3597 3598 /* policy info */ 3599 size_pol += sizeof(struct sadb_x_policy); 3600 3601 /* ipsecrequests */ 3602 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3603 int pair_size; 3604 3605 pair_size = pfkey_sockaddr_pair_size(mp->old_family); 3606 if (!pair_size) 3607 return -EINVAL; 3608 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size; 3609 3610 pair_size = pfkey_sockaddr_pair_size(mp->new_family); 3611 if (!pair_size) 3612 return -EINVAL; 3613 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size; 3614 } 3615 3616 size += sizeof(struct sadb_msg) + size_pol; 3617 3618 /* alloc buffer */ 3619 skb = alloc_skb(size, GFP_ATOMIC); 3620 if (skb == NULL) 3621 return -ENOMEM; 3622 3623 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3624 hdr->sadb_msg_version = PF_KEY_V2; 3625 hdr->sadb_msg_type = SADB_X_MIGRATE; 3626 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3627 hdr->sadb_msg_len = size / 8; 3628 hdr->sadb_msg_errno = 0; 3629 hdr->sadb_msg_reserved = 0; 3630 hdr->sadb_msg_seq = 0; 3631 hdr->sadb_msg_pid = 0; 3632 3633 /* Addresses to be used by KM for negotiation, if ext is available */ 3634 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3635 goto err; 3636 3637 /* selector src */ 3638 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3639 3640 /* selector dst */ 3641 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3642 3643 /* policy information */ 3644 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3645 pol->sadb_x_policy_len = size_pol / 8; 3646 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3647 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3648 pol->sadb_x_policy_dir = dir + 1; 3649 pol->sadb_x_policy_reserved = 0; 3650 pol->sadb_x_policy_id = 0; 3651 pol->sadb_x_policy_priority = 0; 3652 3653 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3654 /* old ipsecrequest */ 3655 int mode = pfkey_mode_from_xfrm(mp->mode); 3656 if (mode < 0) 3657 goto err; 3658 if (set_ipsecrequest(skb, mp->proto, mode, 3659 (mp->old_reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3660 mp->old_reqid, mp->old_family, 3661 &mp->old_saddr, &mp->old_daddr) < 0) 3662 goto err; 3663 3664 /* new ipsecrequest */ 3665 if (set_ipsecrequest(skb, mp->proto, mode, 3666 (mp->old_reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3667 mp->old_reqid, mp->new_family, 3668 &mp->new_saddr, &mp->new_daddr) < 0) 3669 goto err; 3670 } 3671 3672 /* broadcast migrate message to sockets */ 3673 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, net); 3674 3675 return 0; 3676 3677 err: 3678 kfree_skb(skb); 3679 return -EINVAL; 3680 } 3681 #else 3682 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3683 const struct xfrm_migrate *m, int num_bundles, 3684 const struct xfrm_kmaddress *k, struct net *net, 3685 const struct xfrm_encap_tmpl *encap) 3686 { 3687 return -ENOPROTOOPT; 3688 } 3689 #endif 3690 3691 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3692 { 3693 struct sock *sk = sock->sk; 3694 struct sk_buff *skb = NULL; 3695 struct sadb_msg *hdr = NULL; 3696 int err; 3697 struct net *net = sock_net(sk); 3698 3699 err = -EOPNOTSUPP; 3700 if (msg->msg_flags & MSG_OOB) 3701 goto out; 3702 3703 err = -EMSGSIZE; 3704 if ((unsigned int)len > sk->sk_sndbuf - 32) 3705 goto out; 3706 3707 err = -ENOBUFS; 3708 skb = alloc_skb(len, GFP_KERNEL); 3709 if (skb == NULL) 3710 goto out; 3711 3712 err = -EFAULT; 3713 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3714 goto out; 3715 3716 hdr = pfkey_get_base_msg(skb, &err); 3717 if (!hdr) 3718 goto out; 3719 3720 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3721 err = pfkey_process(sk, skb, hdr); 3722 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3723 3724 out: 3725 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3726 err = 0; 3727 kfree_skb(skb); 3728 3729 return err ? : len; 3730 } 3731 3732 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3733 int flags) 3734 { 3735 struct sock *sk = sock->sk; 3736 struct pfkey_sock *pfk = pfkey_sk(sk); 3737 struct sk_buff *skb; 3738 int copied, err; 3739 3740 err = -EINVAL; 3741 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3742 goto out; 3743 3744 skb = skb_recv_datagram(sk, flags, &err); 3745 if (skb == NULL) 3746 goto out; 3747 3748 copied = skb->len; 3749 if (copied > len) { 3750 msg->msg_flags |= MSG_TRUNC; 3751 copied = len; 3752 } 3753 3754 skb_reset_transport_header(skb); 3755 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3756 if (err) 3757 goto out_free; 3758 3759 sock_recv_cmsgs(msg, sk, skb); 3760 3761 err = (flags & MSG_TRUNC) ? skb->len : copied; 3762 3763 if (pfk->dump.dump != NULL && 3764 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3765 pfkey_do_dump(pfk); 3766 3767 out_free: 3768 skb_free_datagram(sk, skb); 3769 out: 3770 return err; 3771 } 3772 3773 static const struct proto_ops pfkey_ops = { 3774 .family = PF_KEY, 3775 .owner = THIS_MODULE, 3776 /* Operations that make no sense on pfkey sockets. */ 3777 .bind = sock_no_bind, 3778 .connect = sock_no_connect, 3779 .socketpair = sock_no_socketpair, 3780 .accept = sock_no_accept, 3781 .getname = sock_no_getname, 3782 .ioctl = sock_no_ioctl, 3783 .listen = sock_no_listen, 3784 .shutdown = sock_no_shutdown, 3785 .mmap = sock_no_mmap, 3786 3787 /* Now the operations that really occur. */ 3788 .release = pfkey_release, 3789 .poll = datagram_poll, 3790 .sendmsg = pfkey_sendmsg, 3791 .recvmsg = pfkey_recvmsg, 3792 }; 3793 3794 static const struct net_proto_family pfkey_family_ops = { 3795 .family = PF_KEY, 3796 .create = pfkey_create, 3797 .owner = THIS_MODULE, 3798 }; 3799 3800 #ifdef CONFIG_PROC_FS 3801 static int pfkey_seq_show(struct seq_file *f, void *v) 3802 { 3803 struct sock *s = sk_entry(v); 3804 3805 if (v == SEQ_START_TOKEN) 3806 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3807 else 3808 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6llu\n", 3809 s, 3810 refcount_read(&s->sk_refcnt), 3811 sk_rmem_alloc_get(s), 3812 sk_wmem_alloc_get(s), 3813 from_kuid_munged(seq_user_ns(f), sk_uid(s)), 3814 sock_i_ino(s) 3815 ); 3816 return 0; 3817 } 3818 3819 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3820 __acquires(rcu) 3821 { 3822 struct net *net = seq_file_net(f); 3823 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3824 3825 rcu_read_lock(); 3826 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3827 } 3828 3829 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3830 { 3831 struct net *net = seq_file_net(f); 3832 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3833 3834 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3835 } 3836 3837 static void pfkey_seq_stop(struct seq_file *f, void *v) 3838 __releases(rcu) 3839 { 3840 rcu_read_unlock(); 3841 } 3842 3843 static const struct seq_operations pfkey_seq_ops = { 3844 .start = pfkey_seq_start, 3845 .next = pfkey_seq_next, 3846 .stop = pfkey_seq_stop, 3847 .show = pfkey_seq_show, 3848 }; 3849 3850 static int __net_init pfkey_init_proc(struct net *net) 3851 { 3852 struct proc_dir_entry *e; 3853 3854 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3855 sizeof(struct seq_net_private)); 3856 if (e == NULL) 3857 return -ENOMEM; 3858 3859 return 0; 3860 } 3861 3862 static void __net_exit pfkey_exit_proc(struct net *net) 3863 { 3864 remove_proc_entry("pfkey", net->proc_net); 3865 } 3866 #else 3867 static inline int pfkey_init_proc(struct net *net) 3868 { 3869 return 0; 3870 } 3871 3872 static inline void pfkey_exit_proc(struct net *net) 3873 { 3874 } 3875 #endif 3876 3877 static struct xfrm_mgr pfkeyv2_mgr = 3878 { 3879 .notify = pfkey_send_notify, 3880 .acquire = pfkey_send_acquire, 3881 .compile_policy = pfkey_compile_policy, 3882 .new_mapping = pfkey_send_new_mapping, 3883 .notify_policy = pfkey_send_policy_notify, 3884 .migrate = pfkey_send_migrate, 3885 .is_alive = pfkey_is_alive, 3886 }; 3887 3888 static int __net_init pfkey_net_init(struct net *net) 3889 { 3890 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3891 int rv; 3892 3893 INIT_HLIST_HEAD(&net_pfkey->table); 3894 atomic_set(&net_pfkey->socks_nr, 0); 3895 3896 rv = pfkey_init_proc(net); 3897 3898 return rv; 3899 } 3900 3901 static void __net_exit pfkey_net_exit(struct net *net) 3902 { 3903 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3904 3905 pfkey_exit_proc(net); 3906 WARN_ON(!hlist_empty(&net_pfkey->table)); 3907 } 3908 3909 static struct pernet_operations pfkey_net_ops = { 3910 .init = pfkey_net_init, 3911 .exit = pfkey_net_exit, 3912 .id = &pfkey_net_id, 3913 .size = sizeof(struct netns_pfkey), 3914 }; 3915 3916 static void __exit ipsec_pfkey_exit(void) 3917 { 3918 xfrm_unregister_km(&pfkeyv2_mgr); 3919 sock_unregister(PF_KEY); 3920 unregister_pernet_subsys(&pfkey_net_ops); 3921 proto_unregister(&key_proto); 3922 } 3923 3924 static int __init ipsec_pfkey_init(void) 3925 { 3926 int err = proto_register(&key_proto, 0); 3927 3928 pr_warn_once("PFKEY is deprecated and scheduled to be removed in 2027, " 3929 "please contact the netdev mailing list\n"); 3930 if (err != 0) 3931 goto out; 3932 3933 err = register_pernet_subsys(&pfkey_net_ops); 3934 if (err != 0) 3935 goto out_unregister_key_proto; 3936 err = sock_register(&pfkey_family_ops); 3937 if (err != 0) 3938 goto out_unregister_pernet; 3939 xfrm_register_km(&pfkeyv2_mgr); 3940 out: 3941 return err; 3942 3943 out_unregister_pernet: 3944 unregister_pernet_subsys(&pfkey_net_ops); 3945 out_unregister_key_proto: 3946 proto_unregister(&key_proto); 3947 goto out; 3948 } 3949 3950 module_init(ipsec_pfkey_init); 3951 module_exit(ipsec_pfkey_exit); 3952 MODULE_DESCRIPTION("PF_KEY socket helpers"); 3953 MODULE_LICENSE("GPL"); 3954 MODULE_ALIAS_NETPROTO(PF_KEY); 3955