1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <net/net_namespace.h> 31 #include <net/netns/generic.h> 32 #include <net/xfrm.h> 33 34 #include <net/sock.h> 35 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 38 39 static unsigned int pfkey_net_id __read_mostly; 40 struct netns_pfkey { 41 /* List of all pfkey sockets. */ 42 struct hlist_head table; 43 atomic_t socks_nr; 44 }; 45 static DEFINE_MUTEX(pfkey_mutex); 46 47 #define DUMMY_MARK 0 48 static const struct xfrm_mark dummy_mark = {0, 0}; 49 struct pfkey_sock { 50 /* struct sock must be the first member of struct pfkey_sock */ 51 struct sock sk; 52 int registered; 53 int promisc; 54 55 struct { 56 uint8_t msg_version; 57 uint32_t msg_portid; 58 int (*dump)(struct pfkey_sock *sk); 59 void (*done)(struct pfkey_sock *sk); 60 union { 61 struct xfrm_policy_walk policy; 62 struct xfrm_state_walk state; 63 } u; 64 struct sk_buff *skb; 65 } dump; 66 struct mutex dump_lock; 67 }; 68 69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 70 xfrm_address_t *saddr, xfrm_address_t *daddr, 71 u16 *family); 72 73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 74 { 75 return (struct pfkey_sock *)sk; 76 } 77 78 static int pfkey_can_dump(const struct sock *sk) 79 { 80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 81 return 1; 82 return 0; 83 } 84 85 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 86 { 87 if (pfk->dump.dump) { 88 if (pfk->dump.skb) { 89 kfree_skb(pfk->dump.skb); 90 pfk->dump.skb = NULL; 91 } 92 pfk->dump.done(pfk); 93 pfk->dump.dump = NULL; 94 pfk->dump.done = NULL; 95 } 96 } 97 98 static void pfkey_sock_destruct(struct sock *sk) 99 { 100 struct net *net = sock_net(sk); 101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 102 103 pfkey_terminate_dump(pfkey_sk(sk)); 104 skb_queue_purge(&sk->sk_receive_queue); 105 106 if (!sock_flag(sk, SOCK_DEAD)) { 107 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 108 return; 109 } 110 111 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 112 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 113 114 atomic_dec(&net_pfkey->socks_nr); 115 } 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 struct net *net = sock_net(sk); 122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 123 124 mutex_lock(&pfkey_mutex); 125 sk_add_node_rcu(sk, &net_pfkey->table); 126 mutex_unlock(&pfkey_mutex); 127 } 128 129 static void pfkey_remove(struct sock *sk) 130 { 131 mutex_lock(&pfkey_mutex); 132 sk_del_node_init_rcu(sk); 133 mutex_unlock(&pfkey_mutex); 134 } 135 136 static struct proto key_proto = { 137 .name = "KEY", 138 .owner = THIS_MODULE, 139 .obj_size = sizeof(struct pfkey_sock), 140 }; 141 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 143 int kern) 144 { 145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 146 struct sock *sk; 147 struct pfkey_sock *pfk; 148 int err; 149 150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 151 return -EPERM; 152 if (sock->type != SOCK_RAW) 153 return -ESOCKTNOSUPPORT; 154 if (protocol != PF_KEY_V2) 155 return -EPROTONOSUPPORT; 156 157 err = -ENOMEM; 158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 159 if (sk == NULL) 160 goto out; 161 162 pfk = pfkey_sk(sk); 163 mutex_init(&pfk->dump_lock); 164 165 sock->ops = &pfkey_ops; 166 sock_init_data(sock, sk); 167 168 sk->sk_family = PF_KEY; 169 sk->sk_destruct = pfkey_sock_destruct; 170 171 atomic_inc(&net_pfkey->socks_nr); 172 173 pfkey_insert(sk); 174 175 return 0; 176 out: 177 return err; 178 } 179 180 static int pfkey_release(struct socket *sock) 181 { 182 struct sock *sk = sock->sk; 183 184 if (!sk) 185 return 0; 186 187 pfkey_remove(sk); 188 189 sock_orphan(sk); 190 sock->sk = NULL; 191 skb_queue_purge(&sk->sk_write_queue); 192 193 synchronize_rcu(); 194 sock_put(sk); 195 196 return 0; 197 } 198 199 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 200 gfp_t allocation, struct sock *sk) 201 { 202 int err = -ENOBUFS; 203 204 sock_hold(sk); 205 if (*skb2 == NULL) { 206 if (refcount_read(&skb->users) != 1) { 207 *skb2 = skb_clone(skb, allocation); 208 } else { 209 *skb2 = skb; 210 refcount_inc(&skb->users); 211 } 212 } 213 if (*skb2 != NULL) { 214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 215 skb_set_owner_r(*skb2, sk); 216 skb_queue_tail(&sk->sk_receive_queue, *skb2); 217 sk->sk_data_ready(sk); 218 *skb2 = NULL; 219 err = 0; 220 } 221 } 222 sock_put(sk); 223 return err; 224 } 225 226 /* Send SKB to all pfkey sockets matching selected criteria. */ 227 #define BROADCAST_ALL 0 228 #define BROADCAST_ONE 1 229 #define BROADCAST_REGISTERED 2 230 #define BROADCAST_PROMISC_ONLY 4 231 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 232 int broadcast_flags, struct sock *one_sk, 233 struct net *net) 234 { 235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 236 struct sock *sk; 237 struct sk_buff *skb2 = NULL; 238 int err = -ESRCH; 239 240 /* XXX Do we need something like netlink_overrun? I think 241 * XXX PF_KEY socket apps will not mind current behavior. 242 */ 243 if (!skb) 244 return -ENOMEM; 245 246 rcu_read_lock(); 247 sk_for_each_rcu(sk, &net_pfkey->table) { 248 struct pfkey_sock *pfk = pfkey_sk(sk); 249 int err2; 250 251 /* Yes, it means that if you are meant to receive this 252 * pfkey message you receive it twice as promiscuous 253 * socket. 254 */ 255 if (pfk->promisc) 256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 257 258 /* the exact target will be processed later */ 259 if (sk == one_sk) 260 continue; 261 if (broadcast_flags != BROADCAST_ALL) { 262 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 263 continue; 264 if ((broadcast_flags & BROADCAST_REGISTERED) && 265 !pfk->registered) 266 continue; 267 if (broadcast_flags & BROADCAST_ONE) 268 continue; 269 } 270 271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 272 273 /* Error is cleared after successful sending to at least one 274 * registered KM */ 275 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 276 err = err2; 277 } 278 rcu_read_unlock(); 279 280 if (one_sk != NULL) 281 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 282 283 kfree_skb(skb2); 284 kfree_skb(skb); 285 return err; 286 } 287 288 static int pfkey_do_dump(struct pfkey_sock *pfk) 289 { 290 struct sadb_msg *hdr; 291 int rc; 292 293 mutex_lock(&pfk->dump_lock); 294 if (!pfk->dump.dump) { 295 rc = 0; 296 goto out; 297 } 298 299 rc = pfk->dump.dump(pfk); 300 if (rc == -ENOBUFS) { 301 rc = 0; 302 goto out; 303 } 304 305 if (pfk->dump.skb) { 306 if (!pfkey_can_dump(&pfk->sk)) { 307 rc = 0; 308 goto out; 309 } 310 311 hdr = (struct sadb_msg *) pfk->dump.skb->data; 312 hdr->sadb_msg_seq = 0; 313 hdr->sadb_msg_errno = rc; 314 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 315 &pfk->sk, sock_net(&pfk->sk)); 316 pfk->dump.skb = NULL; 317 } 318 319 pfkey_terminate_dump(pfk); 320 321 out: 322 mutex_unlock(&pfk->dump_lock); 323 return rc; 324 } 325 326 static inline void pfkey_hdr_dup(struct sadb_msg *new, 327 const struct sadb_msg *orig) 328 { 329 *new = *orig; 330 } 331 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 333 { 334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 335 struct sadb_msg *hdr; 336 337 if (!skb) 338 return -ENOBUFS; 339 340 /* Woe be to the platform trying to support PFKEY yet 341 * having normal errnos outside the 1-255 range, inclusive. 342 */ 343 err = -err; 344 if (err == ERESTARTSYS || 345 err == ERESTARTNOHAND || 346 err == ERESTARTNOINTR) 347 err = EINTR; 348 if (err >= 512) 349 err = EINVAL; 350 BUG_ON(err <= 0 || err >= 256); 351 352 hdr = skb_put(skb, sizeof(struct sadb_msg)); 353 pfkey_hdr_dup(hdr, orig); 354 hdr->sadb_msg_errno = (uint8_t) err; 355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 356 sizeof(uint64_t)); 357 358 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 359 360 return 0; 361 } 362 363 static const u8 sadb_ext_min_len[] = { 364 [SADB_EXT_RESERVED] = (u8) 0, 365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 391 }; 392 393 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 394 static int verify_address_len(const void *p) 395 { 396 const struct sadb_address *sp = p; 397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 398 const struct sockaddr_in *sin; 399 #if IS_ENABLED(CONFIG_IPV6) 400 const struct sockaddr_in6 *sin6; 401 #endif 402 int len; 403 404 if (sp->sadb_address_len < 405 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 406 sizeof(uint64_t))) 407 return -EINVAL; 408 409 switch (addr->sa_family) { 410 case AF_INET: 411 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 412 if (sp->sadb_address_len != len || 413 sp->sadb_address_prefixlen > 32) 414 return -EINVAL; 415 break; 416 #if IS_ENABLED(CONFIG_IPV6) 417 case AF_INET6: 418 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 419 if (sp->sadb_address_len != len || 420 sp->sadb_address_prefixlen > 128) 421 return -EINVAL; 422 break; 423 #endif 424 default: 425 /* It is user using kernel to keep track of security 426 * associations for another protocol, such as 427 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 428 * lengths. 429 * 430 * XXX Actually, association/policy database is not yet 431 * XXX able to cope with arbitrary sockaddr families. 432 * XXX When it can, remove this -EINVAL. -DaveM 433 */ 434 return -EINVAL; 435 } 436 437 return 0; 438 } 439 440 static inline int 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 if (ext_type == SADB_EXT_ADDRESS_SRC || 537 ext_type == SADB_EXT_ADDRESS_DST || 538 ext_type == SADB_EXT_ADDRESS_PROXY || 539 ext_type == SADB_X_EXT_NAT_T_OA) { 540 if (verify_address_len(p)) 541 return -EINVAL; 542 } 543 if (ext_type == SADB_X_EXT_SEC_CTX) { 544 if (verify_sec_ctx_len(p)) 545 return -EINVAL; 546 } 547 ext_hdrs[ext_type-1] = (void *) p; 548 } 549 p += ext_len; 550 len -= ext_len; 551 } 552 553 return 0; 554 } 555 556 static uint16_t 557 pfkey_satype2proto(uint8_t satype) 558 { 559 switch (satype) { 560 case SADB_SATYPE_UNSPEC: 561 return IPSEC_PROTO_ANY; 562 case SADB_SATYPE_AH: 563 return IPPROTO_AH; 564 case SADB_SATYPE_ESP: 565 return IPPROTO_ESP; 566 case SADB_X_SATYPE_IPCOMP: 567 return IPPROTO_COMP; 568 default: 569 return 0; 570 } 571 /* NOTREACHED */ 572 } 573 574 static uint8_t 575 pfkey_proto2satype(uint16_t proto) 576 { 577 switch (proto) { 578 case IPPROTO_AH: 579 return SADB_SATYPE_AH; 580 case IPPROTO_ESP: 581 return SADB_SATYPE_ESP; 582 case IPPROTO_COMP: 583 return SADB_X_SATYPE_IPCOMP; 584 default: 585 return 0; 586 } 587 /* NOTREACHED */ 588 } 589 590 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 591 * say specifically 'just raw sockets' as we encode them as 255. 592 */ 593 594 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 595 { 596 return proto == IPSEC_PROTO_ANY ? 0 : proto; 597 } 598 599 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 600 { 601 return proto ? proto : IPSEC_PROTO_ANY; 602 } 603 604 static inline int pfkey_sockaddr_len(sa_family_t family) 605 { 606 switch (family) { 607 case AF_INET: 608 return sizeof(struct sockaddr_in); 609 #if IS_ENABLED(CONFIG_IPV6) 610 case AF_INET6: 611 return sizeof(struct sockaddr_in6); 612 #endif 613 } 614 return 0; 615 } 616 617 static 618 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 619 { 620 switch (sa->sa_family) { 621 case AF_INET: 622 xaddr->a4 = 623 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 624 return AF_INET; 625 #if IS_ENABLED(CONFIG_IPV6) 626 case AF_INET6: 627 memcpy(xaddr->a6, 628 &((struct sockaddr_in6 *)sa)->sin6_addr, 629 sizeof(struct in6_addr)); 630 return AF_INET6; 631 #endif 632 } 633 return 0; 634 } 635 636 static 637 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 638 { 639 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 640 xaddr); 641 } 642 643 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 644 { 645 const struct sadb_sa *sa; 646 const struct sadb_address *addr; 647 uint16_t proto; 648 unsigned short family; 649 xfrm_address_t *xaddr; 650 651 sa = ext_hdrs[SADB_EXT_SA - 1]; 652 if (sa == NULL) 653 return NULL; 654 655 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 656 if (proto == 0) 657 return NULL; 658 659 /* sadb_address_len should be checked by caller */ 660 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 661 if (addr == NULL) 662 return NULL; 663 664 family = ((const struct sockaddr *)(addr + 1))->sa_family; 665 switch (family) { 666 case AF_INET: 667 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 668 break; 669 #if IS_ENABLED(CONFIG_IPV6) 670 case AF_INET6: 671 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 672 break; 673 #endif 674 default: 675 xaddr = NULL; 676 } 677 678 if (!xaddr) 679 return NULL; 680 681 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 682 } 683 684 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 685 686 static int 687 pfkey_sockaddr_size(sa_family_t family) 688 { 689 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 690 } 691 692 static inline int pfkey_mode_from_xfrm(int mode) 693 { 694 switch(mode) { 695 case XFRM_MODE_TRANSPORT: 696 return IPSEC_MODE_TRANSPORT; 697 case XFRM_MODE_TUNNEL: 698 return IPSEC_MODE_TUNNEL; 699 case XFRM_MODE_BEET: 700 return IPSEC_MODE_BEET; 701 default: 702 return -1; 703 } 704 } 705 706 static inline int pfkey_mode_to_xfrm(int mode) 707 { 708 switch(mode) { 709 case IPSEC_MODE_ANY: /*XXX*/ 710 case IPSEC_MODE_TRANSPORT: 711 return XFRM_MODE_TRANSPORT; 712 case IPSEC_MODE_TUNNEL: 713 return XFRM_MODE_TUNNEL; 714 case IPSEC_MODE_BEET: 715 return XFRM_MODE_BEET; 716 default: 717 return -1; 718 } 719 } 720 721 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 722 struct sockaddr *sa, 723 unsigned short family) 724 { 725 switch (family) { 726 case AF_INET: 727 { 728 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 729 sin->sin_family = AF_INET; 730 sin->sin_port = port; 731 sin->sin_addr.s_addr = xaddr->a4; 732 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 733 return 32; 734 } 735 #if IS_ENABLED(CONFIG_IPV6) 736 case AF_INET6: 737 { 738 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 739 sin6->sin6_family = AF_INET6; 740 sin6->sin6_port = port; 741 sin6->sin6_flowinfo = 0; 742 sin6->sin6_addr = xaddr->in6; 743 sin6->sin6_scope_id = 0; 744 return 128; 745 } 746 #endif 747 } 748 return 0; 749 } 750 751 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 752 int add_keys, int hsc) 753 { 754 struct sk_buff *skb; 755 struct sadb_msg *hdr; 756 struct sadb_sa *sa; 757 struct sadb_lifetime *lifetime; 758 struct sadb_address *addr; 759 struct sadb_key *key; 760 struct sadb_x_sa2 *sa2; 761 struct sadb_x_sec_ctx *sec_ctx; 762 struct xfrm_sec_ctx *xfrm_ctx; 763 int ctx_size = 0; 764 int size; 765 int auth_key_size = 0; 766 int encrypt_key_size = 0; 767 int sockaddr_size; 768 struct xfrm_encap_tmpl *natt = NULL; 769 int mode; 770 771 /* address family check */ 772 sockaddr_size = pfkey_sockaddr_size(x->props.family); 773 if (!sockaddr_size) 774 return ERR_PTR(-EINVAL); 775 776 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 777 key(AE), (identity(SD),) (sensitivity)> */ 778 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 779 sizeof(struct sadb_lifetime) + 780 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 781 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 782 sizeof(struct sadb_address)*2 + 783 sockaddr_size*2 + 784 sizeof(struct sadb_x_sa2); 785 786 if ((xfrm_ctx = x->security)) { 787 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 788 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 789 } 790 791 /* identity & sensitivity */ 792 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 793 size += sizeof(struct sadb_address) + sockaddr_size; 794 795 if (add_keys) { 796 if (x->aalg && x->aalg->alg_key_len) { 797 auth_key_size = 798 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 799 size += sizeof(struct sadb_key) + auth_key_size; 800 } 801 if (x->ealg && x->ealg->alg_key_len) { 802 encrypt_key_size = 803 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 804 size += sizeof(struct sadb_key) + encrypt_key_size; 805 } 806 } 807 if (x->encap) 808 natt = x->encap; 809 810 if (natt && natt->encap_type) { 811 size += sizeof(struct sadb_x_nat_t_type); 812 size += sizeof(struct sadb_x_nat_t_port); 813 size += sizeof(struct sadb_x_nat_t_port); 814 } 815 816 skb = alloc_skb(size + 16, GFP_ATOMIC); 817 if (skb == NULL) 818 return ERR_PTR(-ENOBUFS); 819 820 /* call should fill header later */ 821 hdr = skb_put(skb, sizeof(struct sadb_msg)); 822 memset(hdr, 0, size); /* XXX do we need this ? */ 823 hdr->sadb_msg_len = size / sizeof(uint64_t); 824 825 /* sa */ 826 sa = skb_put(skb, sizeof(struct sadb_sa)); 827 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 828 sa->sadb_sa_exttype = SADB_EXT_SA; 829 sa->sadb_sa_spi = x->id.spi; 830 sa->sadb_sa_replay = x->props.replay_window; 831 switch (x->km.state) { 832 case XFRM_STATE_VALID: 833 sa->sadb_sa_state = x->km.dying ? 834 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 835 break; 836 case XFRM_STATE_ACQ: 837 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 838 break; 839 default: 840 sa->sadb_sa_state = SADB_SASTATE_DEAD; 841 break; 842 } 843 sa->sadb_sa_auth = 0; 844 if (x->aalg) { 845 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 846 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 847 a->desc.sadb_alg_id : 0; 848 } 849 sa->sadb_sa_encrypt = 0; 850 BUG_ON(x->ealg && x->calg); 851 if (x->ealg) { 852 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 853 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 854 a->desc.sadb_alg_id : 0; 855 } 856 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 857 if (x->calg) { 858 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 859 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 860 a->desc.sadb_alg_id : 0; 861 } 862 863 sa->sadb_sa_flags = 0; 864 if (x->props.flags & XFRM_STATE_NOECN) 865 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 866 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 867 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 868 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 869 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 870 871 /* hard time */ 872 if (hsc & 2) { 873 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 874 lifetime->sadb_lifetime_len = 875 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 876 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 877 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 878 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 879 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 880 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 881 } 882 /* soft time */ 883 if (hsc & 1) { 884 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 885 lifetime->sadb_lifetime_len = 886 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 887 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 888 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 889 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 890 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 891 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 892 } 893 /* current time */ 894 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 895 lifetime->sadb_lifetime_len = 896 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 897 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 898 lifetime->sadb_lifetime_allocations = x->curlft.packets; 899 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 900 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 901 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 902 /* src address */ 903 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 904 addr->sadb_address_len = 905 (sizeof(struct sadb_address)+sockaddr_size)/ 906 sizeof(uint64_t); 907 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 908 /* "if the ports are non-zero, then the sadb_address_proto field, 909 normally zero, MUST be filled in with the transport 910 protocol's number." - RFC2367 */ 911 addr->sadb_address_proto = 0; 912 addr->sadb_address_reserved = 0; 913 914 addr->sadb_address_prefixlen = 915 pfkey_sockaddr_fill(&x->props.saddr, 0, 916 (struct sockaddr *) (addr + 1), 917 x->props.family); 918 if (!addr->sadb_address_prefixlen) 919 BUG(); 920 921 /* dst address */ 922 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 923 addr->sadb_address_len = 924 (sizeof(struct sadb_address)+sockaddr_size)/ 925 sizeof(uint64_t); 926 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 927 addr->sadb_address_proto = 0; 928 addr->sadb_address_reserved = 0; 929 930 addr->sadb_address_prefixlen = 931 pfkey_sockaddr_fill(&x->id.daddr, 0, 932 (struct sockaddr *) (addr + 1), 933 x->props.family); 934 if (!addr->sadb_address_prefixlen) 935 BUG(); 936 937 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 938 x->props.family)) { 939 addr = skb_put(skb, 940 sizeof(struct sadb_address) + sockaddr_size); 941 addr->sadb_address_len = 942 (sizeof(struct sadb_address)+sockaddr_size)/ 943 sizeof(uint64_t); 944 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 945 addr->sadb_address_proto = 946 pfkey_proto_from_xfrm(x->sel.proto); 947 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 948 addr->sadb_address_reserved = 0; 949 950 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 951 (struct sockaddr *) (addr + 1), 952 x->props.family); 953 } 954 955 /* auth key */ 956 if (add_keys && auth_key_size) { 957 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 958 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 959 sizeof(uint64_t); 960 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 961 key->sadb_key_bits = x->aalg->alg_key_len; 962 key->sadb_key_reserved = 0; 963 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 964 } 965 /* encrypt key */ 966 if (add_keys && encrypt_key_size) { 967 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 968 key->sadb_key_len = (sizeof(struct sadb_key) + 969 encrypt_key_size) / sizeof(uint64_t); 970 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 971 key->sadb_key_bits = x->ealg->alg_key_len; 972 key->sadb_key_reserved = 0; 973 memcpy(key + 1, x->ealg->alg_key, 974 (x->ealg->alg_key_len+7)/8); 975 } 976 977 /* sa */ 978 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 979 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 980 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 981 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 982 kfree_skb(skb); 983 return ERR_PTR(-EINVAL); 984 } 985 sa2->sadb_x_sa2_mode = mode; 986 sa2->sadb_x_sa2_reserved1 = 0; 987 sa2->sadb_x_sa2_reserved2 = 0; 988 sa2->sadb_x_sa2_sequence = 0; 989 sa2->sadb_x_sa2_reqid = x->props.reqid; 990 991 if (natt && natt->encap_type) { 992 struct sadb_x_nat_t_type *n_type; 993 struct sadb_x_nat_t_port *n_port; 994 995 /* type */ 996 n_type = skb_put(skb, sizeof(*n_type)); 997 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 998 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 999 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1000 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1001 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1002 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1003 1004 /* source port */ 1005 n_port = skb_put(skb, sizeof(*n_port)); 1006 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1007 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1008 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1009 n_port->sadb_x_nat_t_port_reserved = 0; 1010 1011 /* dest port */ 1012 n_port = skb_put(skb, sizeof(*n_port)); 1013 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1014 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1015 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1016 n_port->sadb_x_nat_t_port_reserved = 0; 1017 } 1018 1019 /* security context */ 1020 if (xfrm_ctx) { 1021 sec_ctx = skb_put(skb, 1022 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1023 sec_ctx->sadb_x_sec_len = 1024 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1025 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1026 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1027 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1028 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1029 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1030 xfrm_ctx->ctx_len); 1031 } 1032 1033 return skb; 1034 } 1035 1036 1037 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1038 { 1039 struct sk_buff *skb; 1040 1041 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1042 1043 return skb; 1044 } 1045 1046 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1047 int hsc) 1048 { 1049 return __pfkey_xfrm_state2msg(x, 0, hsc); 1050 } 1051 1052 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1053 const struct sadb_msg *hdr, 1054 void * const *ext_hdrs) 1055 { 1056 struct xfrm_state *x; 1057 const struct sadb_lifetime *lifetime; 1058 const struct sadb_sa *sa; 1059 const struct sadb_key *key; 1060 const struct sadb_x_sec_ctx *sec_ctx; 1061 uint16_t proto; 1062 int err; 1063 1064 1065 sa = ext_hdrs[SADB_EXT_SA - 1]; 1066 if (!sa || 1067 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1068 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1069 return ERR_PTR(-EINVAL); 1070 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1071 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1072 return ERR_PTR(-EINVAL); 1073 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1074 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1075 return ERR_PTR(-EINVAL); 1076 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1077 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1078 return ERR_PTR(-EINVAL); 1079 1080 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1081 if (proto == 0) 1082 return ERR_PTR(-EINVAL); 1083 1084 /* default error is no buffer space */ 1085 err = -ENOBUFS; 1086 1087 /* RFC2367: 1088 1089 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1090 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1091 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1092 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1093 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1094 not true. 1095 1096 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1097 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1098 */ 1099 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1100 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1101 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1102 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1103 return ERR_PTR(-EINVAL); 1104 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1105 if (key != NULL && 1106 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1107 ((key->sadb_key_bits+7) / 8 == 0 || 1108 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1109 return ERR_PTR(-EINVAL); 1110 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1111 if (key != NULL && 1112 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1113 ((key->sadb_key_bits+7) / 8 == 0 || 1114 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1115 return ERR_PTR(-EINVAL); 1116 1117 x = xfrm_state_alloc(net); 1118 if (x == NULL) 1119 return ERR_PTR(-ENOBUFS); 1120 1121 x->id.proto = proto; 1122 x->id.spi = sa->sadb_sa_spi; 1123 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1124 (sizeof(x->replay.bitmap) * 8)); 1125 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1126 x->props.flags |= XFRM_STATE_NOECN; 1127 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1128 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1129 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1130 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1131 1132 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1133 if (lifetime != NULL) { 1134 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1135 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1136 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1137 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1138 } 1139 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1140 if (lifetime != NULL) { 1141 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1142 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1143 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1144 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1145 } 1146 1147 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1148 if (sec_ctx != NULL) { 1149 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1150 1151 if (!uctx) 1152 goto out; 1153 1154 err = security_xfrm_state_alloc(x, uctx); 1155 kfree(uctx); 1156 1157 if (err) 1158 goto out; 1159 } 1160 1161 err = -ENOBUFS; 1162 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1163 if (sa->sadb_sa_auth) { 1164 int keysize = 0; 1165 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1166 if (!a || !a->pfkey_supported) { 1167 err = -ENOSYS; 1168 goto out; 1169 } 1170 if (key) 1171 keysize = (key->sadb_key_bits + 7) / 8; 1172 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1173 if (!x->aalg) { 1174 err = -ENOMEM; 1175 goto out; 1176 } 1177 strcpy(x->aalg->alg_name, a->name); 1178 x->aalg->alg_key_len = 0; 1179 if (key) { 1180 x->aalg->alg_key_len = key->sadb_key_bits; 1181 memcpy(x->aalg->alg_key, key+1, keysize); 1182 } 1183 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1184 x->props.aalgo = sa->sadb_sa_auth; 1185 /* x->algo.flags = sa->sadb_sa_flags; */ 1186 } 1187 if (sa->sadb_sa_encrypt) { 1188 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1189 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1190 if (!a || !a->pfkey_supported) { 1191 err = -ENOSYS; 1192 goto out; 1193 } 1194 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1195 if (!x->calg) { 1196 err = -ENOMEM; 1197 goto out; 1198 } 1199 strcpy(x->calg->alg_name, a->name); 1200 x->props.calgo = sa->sadb_sa_encrypt; 1201 } else { 1202 int keysize = 0; 1203 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1204 if (!a || !a->pfkey_supported) { 1205 err = -ENOSYS; 1206 goto out; 1207 } 1208 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1209 if (key) 1210 keysize = (key->sadb_key_bits + 7) / 8; 1211 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1212 if (!x->ealg) { 1213 err = -ENOMEM; 1214 goto out; 1215 } 1216 strcpy(x->ealg->alg_name, a->name); 1217 x->ealg->alg_key_len = 0; 1218 if (key) { 1219 x->ealg->alg_key_len = key->sadb_key_bits; 1220 memcpy(x->ealg->alg_key, key+1, keysize); 1221 } 1222 x->props.ealgo = sa->sadb_sa_encrypt; 1223 x->geniv = a->uinfo.encr.geniv; 1224 } 1225 } 1226 /* x->algo.flags = sa->sadb_sa_flags; */ 1227 1228 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1229 &x->props.saddr); 1230 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1231 &x->id.daddr); 1232 1233 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1234 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1235 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1236 if (mode < 0) { 1237 err = -EINVAL; 1238 goto out; 1239 } 1240 x->props.mode = mode; 1241 x->props.reqid = sa2->sadb_x_sa2_reqid; 1242 } 1243 1244 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1245 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1246 1247 /* Nobody uses this, but we try. */ 1248 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1249 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1250 } 1251 1252 if (!x->sel.family) 1253 x->sel.family = x->props.family; 1254 1255 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1256 const struct sadb_x_nat_t_type* n_type; 1257 struct xfrm_encap_tmpl *natt; 1258 1259 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1260 if (!x->encap) { 1261 err = -ENOMEM; 1262 goto out; 1263 } 1264 1265 natt = x->encap; 1266 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1267 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1268 1269 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1270 const struct sadb_x_nat_t_port *n_port = 1271 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1272 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1273 } 1274 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1275 const struct sadb_x_nat_t_port *n_port = 1276 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1277 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1278 } 1279 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1280 } 1281 1282 err = xfrm_init_state(x); 1283 if (err) 1284 goto out; 1285 1286 x->km.seq = hdr->sadb_msg_seq; 1287 return x; 1288 1289 out: 1290 x->km.state = XFRM_STATE_DEAD; 1291 xfrm_state_put(x); 1292 return ERR_PTR(err); 1293 } 1294 1295 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1296 { 1297 return -EOPNOTSUPP; 1298 } 1299 1300 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1301 { 1302 struct net *net = sock_net(sk); 1303 struct sk_buff *resp_skb; 1304 struct sadb_x_sa2 *sa2; 1305 struct sadb_address *saddr, *daddr; 1306 struct sadb_msg *out_hdr; 1307 struct sadb_spirange *range; 1308 struct xfrm_state *x = NULL; 1309 int mode; 1310 int err; 1311 u32 min_spi, max_spi; 1312 u32 reqid; 1313 u8 proto; 1314 unsigned short family; 1315 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1316 1317 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1318 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1319 return -EINVAL; 1320 1321 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1322 if (proto == 0) 1323 return -EINVAL; 1324 1325 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1326 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1327 if (mode < 0) 1328 return -EINVAL; 1329 reqid = sa2->sadb_x_sa2_reqid; 1330 } else { 1331 mode = 0; 1332 reqid = 0; 1333 } 1334 1335 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1336 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1337 1338 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1339 switch (family) { 1340 case AF_INET: 1341 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1342 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1343 break; 1344 #if IS_ENABLED(CONFIG_IPV6) 1345 case AF_INET6: 1346 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1347 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1348 break; 1349 #endif 1350 } 1351 1352 if (hdr->sadb_msg_seq) { 1353 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1354 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1355 xfrm_state_put(x); 1356 x = NULL; 1357 } 1358 } 1359 1360 if (!x) 1361 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1362 1363 if (x == NULL) 1364 return -ENOENT; 1365 1366 min_spi = 0x100; 1367 max_spi = 0x0fffffff; 1368 1369 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1370 if (range) { 1371 min_spi = range->sadb_spirange_min; 1372 max_spi = range->sadb_spirange_max; 1373 } 1374 1375 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1376 if (err) { 1377 xfrm_state_put(x); 1378 return err; 1379 } 1380 1381 err = xfrm_alloc_spi(x, min_spi, max_spi); 1382 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1383 1384 if (IS_ERR(resp_skb)) { 1385 xfrm_state_put(x); 1386 return PTR_ERR(resp_skb); 1387 } 1388 1389 out_hdr = (struct sadb_msg *) resp_skb->data; 1390 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1391 out_hdr->sadb_msg_type = SADB_GETSPI; 1392 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1393 out_hdr->sadb_msg_errno = 0; 1394 out_hdr->sadb_msg_reserved = 0; 1395 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1396 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1397 1398 xfrm_state_put(x); 1399 1400 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1401 1402 return 0; 1403 } 1404 1405 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1406 { 1407 struct net *net = sock_net(sk); 1408 struct xfrm_state *x; 1409 1410 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1411 return -EOPNOTSUPP; 1412 1413 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1414 return 0; 1415 1416 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1417 if (x == NULL) 1418 return 0; 1419 1420 spin_lock_bh(&x->lock); 1421 if (x->km.state == XFRM_STATE_ACQ) 1422 x->km.state = XFRM_STATE_ERROR; 1423 1424 spin_unlock_bh(&x->lock); 1425 xfrm_state_put(x); 1426 return 0; 1427 } 1428 1429 static inline int event2poltype(int event) 1430 { 1431 switch (event) { 1432 case XFRM_MSG_DELPOLICY: 1433 return SADB_X_SPDDELETE; 1434 case XFRM_MSG_NEWPOLICY: 1435 return SADB_X_SPDADD; 1436 case XFRM_MSG_UPDPOLICY: 1437 return SADB_X_SPDUPDATE; 1438 case XFRM_MSG_POLEXPIRE: 1439 // return SADB_X_SPDEXPIRE; 1440 default: 1441 pr_err("pfkey: Unknown policy event %d\n", event); 1442 break; 1443 } 1444 1445 return 0; 1446 } 1447 1448 static inline int event2keytype(int event) 1449 { 1450 switch (event) { 1451 case XFRM_MSG_DELSA: 1452 return SADB_DELETE; 1453 case XFRM_MSG_NEWSA: 1454 return SADB_ADD; 1455 case XFRM_MSG_UPDSA: 1456 return SADB_UPDATE; 1457 case XFRM_MSG_EXPIRE: 1458 return SADB_EXPIRE; 1459 default: 1460 pr_err("pfkey: Unknown SA event %d\n", event); 1461 break; 1462 } 1463 1464 return 0; 1465 } 1466 1467 /* ADD/UPD/DEL */ 1468 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1469 { 1470 struct sk_buff *skb; 1471 struct sadb_msg *hdr; 1472 1473 skb = pfkey_xfrm_state2msg(x); 1474 1475 if (IS_ERR(skb)) 1476 return PTR_ERR(skb); 1477 1478 hdr = (struct sadb_msg *) skb->data; 1479 hdr->sadb_msg_version = PF_KEY_V2; 1480 hdr->sadb_msg_type = event2keytype(c->event); 1481 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1482 hdr->sadb_msg_errno = 0; 1483 hdr->sadb_msg_reserved = 0; 1484 hdr->sadb_msg_seq = c->seq; 1485 hdr->sadb_msg_pid = c->portid; 1486 1487 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1488 1489 return 0; 1490 } 1491 1492 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1493 { 1494 struct net *net = sock_net(sk); 1495 struct xfrm_state *x; 1496 int err; 1497 struct km_event c; 1498 1499 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1500 if (IS_ERR(x)) 1501 return PTR_ERR(x); 1502 1503 xfrm_state_hold(x); 1504 if (hdr->sadb_msg_type == SADB_ADD) 1505 err = xfrm_state_add(x); 1506 else 1507 err = xfrm_state_update(x); 1508 1509 xfrm_audit_state_add(x, err ? 0 : 1, true); 1510 1511 if (err < 0) { 1512 x->km.state = XFRM_STATE_DEAD; 1513 __xfrm_state_put(x); 1514 goto out; 1515 } 1516 1517 if (hdr->sadb_msg_type == SADB_ADD) 1518 c.event = XFRM_MSG_NEWSA; 1519 else 1520 c.event = XFRM_MSG_UPDSA; 1521 c.seq = hdr->sadb_msg_seq; 1522 c.portid = hdr->sadb_msg_pid; 1523 km_state_notify(x, &c); 1524 out: 1525 xfrm_state_put(x); 1526 return err; 1527 } 1528 1529 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1530 { 1531 struct net *net = sock_net(sk); 1532 struct xfrm_state *x; 1533 struct km_event c; 1534 int err; 1535 1536 if (!ext_hdrs[SADB_EXT_SA-1] || 1537 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1538 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1539 return -EINVAL; 1540 1541 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1542 if (x == NULL) 1543 return -ESRCH; 1544 1545 if ((err = security_xfrm_state_delete(x))) 1546 goto out; 1547 1548 if (xfrm_state_kern(x)) { 1549 err = -EPERM; 1550 goto out; 1551 } 1552 1553 err = xfrm_state_delete(x); 1554 1555 if (err < 0) 1556 goto out; 1557 1558 c.seq = hdr->sadb_msg_seq; 1559 c.portid = hdr->sadb_msg_pid; 1560 c.event = XFRM_MSG_DELSA; 1561 km_state_notify(x, &c); 1562 out: 1563 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1564 xfrm_state_put(x); 1565 1566 return err; 1567 } 1568 1569 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1570 { 1571 struct net *net = sock_net(sk); 1572 __u8 proto; 1573 struct sk_buff *out_skb; 1574 struct sadb_msg *out_hdr; 1575 struct xfrm_state *x; 1576 1577 if (!ext_hdrs[SADB_EXT_SA-1] || 1578 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1579 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1580 return -EINVAL; 1581 1582 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1583 if (x == NULL) 1584 return -ESRCH; 1585 1586 out_skb = pfkey_xfrm_state2msg(x); 1587 proto = x->id.proto; 1588 xfrm_state_put(x); 1589 if (IS_ERR(out_skb)) 1590 return PTR_ERR(out_skb); 1591 1592 out_hdr = (struct sadb_msg *) out_skb->data; 1593 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1594 out_hdr->sadb_msg_type = SADB_GET; 1595 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1596 out_hdr->sadb_msg_errno = 0; 1597 out_hdr->sadb_msg_reserved = 0; 1598 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1599 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1600 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1601 1602 return 0; 1603 } 1604 1605 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1606 gfp_t allocation) 1607 { 1608 struct sk_buff *skb; 1609 struct sadb_msg *hdr; 1610 int len, auth_len, enc_len, i; 1611 1612 auth_len = xfrm_count_pfkey_auth_supported(); 1613 if (auth_len) { 1614 auth_len *= sizeof(struct sadb_alg); 1615 auth_len += sizeof(struct sadb_supported); 1616 } 1617 1618 enc_len = xfrm_count_pfkey_enc_supported(); 1619 if (enc_len) { 1620 enc_len *= sizeof(struct sadb_alg); 1621 enc_len += sizeof(struct sadb_supported); 1622 } 1623 1624 len = enc_len + auth_len + sizeof(struct sadb_msg); 1625 1626 skb = alloc_skb(len + 16, allocation); 1627 if (!skb) 1628 goto out_put_algs; 1629 1630 hdr = skb_put(skb, sizeof(*hdr)); 1631 pfkey_hdr_dup(hdr, orig); 1632 hdr->sadb_msg_errno = 0; 1633 hdr->sadb_msg_len = len / sizeof(uint64_t); 1634 1635 if (auth_len) { 1636 struct sadb_supported *sp; 1637 struct sadb_alg *ap; 1638 1639 sp = skb_put(skb, auth_len); 1640 ap = (struct sadb_alg *) (sp + 1); 1641 1642 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1643 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1644 1645 for (i = 0; ; i++) { 1646 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1647 if (!aalg) 1648 break; 1649 if (!aalg->pfkey_supported) 1650 continue; 1651 if (aalg->available) 1652 *ap++ = aalg->desc; 1653 } 1654 } 1655 1656 if (enc_len) { 1657 struct sadb_supported *sp; 1658 struct sadb_alg *ap; 1659 1660 sp = skb_put(skb, enc_len); 1661 ap = (struct sadb_alg *) (sp + 1); 1662 1663 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1664 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1665 1666 for (i = 0; ; i++) { 1667 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1668 if (!ealg) 1669 break; 1670 if (!ealg->pfkey_supported) 1671 continue; 1672 if (ealg->available) 1673 *ap++ = ealg->desc; 1674 } 1675 } 1676 1677 out_put_algs: 1678 return skb; 1679 } 1680 1681 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1682 { 1683 struct pfkey_sock *pfk = pfkey_sk(sk); 1684 struct sk_buff *supp_skb; 1685 1686 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1687 return -EINVAL; 1688 1689 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1690 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1691 return -EEXIST; 1692 pfk->registered |= (1<<hdr->sadb_msg_satype); 1693 } 1694 1695 xfrm_probe_algs(); 1696 1697 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1698 if (!supp_skb) { 1699 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1700 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1701 1702 return -ENOBUFS; 1703 } 1704 1705 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1706 sock_net(sk)); 1707 return 0; 1708 } 1709 1710 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1711 { 1712 struct sk_buff *skb; 1713 struct sadb_msg *hdr; 1714 1715 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1716 if (!skb) 1717 return -ENOBUFS; 1718 1719 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1720 hdr->sadb_msg_errno = (uint8_t) 0; 1721 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1722 1723 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1724 sock_net(sk)); 1725 } 1726 1727 static int key_notify_sa_flush(const struct km_event *c) 1728 { 1729 struct sk_buff *skb; 1730 struct sadb_msg *hdr; 1731 1732 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1733 if (!skb) 1734 return -ENOBUFS; 1735 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1736 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1737 hdr->sadb_msg_type = SADB_FLUSH; 1738 hdr->sadb_msg_seq = c->seq; 1739 hdr->sadb_msg_pid = c->portid; 1740 hdr->sadb_msg_version = PF_KEY_V2; 1741 hdr->sadb_msg_errno = (uint8_t) 0; 1742 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1743 hdr->sadb_msg_reserved = 0; 1744 1745 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1746 1747 return 0; 1748 } 1749 1750 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1751 { 1752 struct net *net = sock_net(sk); 1753 unsigned int proto; 1754 struct km_event c; 1755 int err, err2; 1756 1757 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1758 if (proto == 0) 1759 return -EINVAL; 1760 1761 err = xfrm_state_flush(net, proto, true); 1762 err2 = unicast_flush_resp(sk, hdr); 1763 if (err || err2) { 1764 if (err == -ESRCH) /* empty table - go quietly */ 1765 err = 0; 1766 return err ? err : err2; 1767 } 1768 1769 c.data.proto = proto; 1770 c.seq = hdr->sadb_msg_seq; 1771 c.portid = hdr->sadb_msg_pid; 1772 c.event = XFRM_MSG_FLUSHSA; 1773 c.net = net; 1774 km_state_notify(NULL, &c); 1775 1776 return 0; 1777 } 1778 1779 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1780 { 1781 struct pfkey_sock *pfk = ptr; 1782 struct sk_buff *out_skb; 1783 struct sadb_msg *out_hdr; 1784 1785 if (!pfkey_can_dump(&pfk->sk)) 1786 return -ENOBUFS; 1787 1788 out_skb = pfkey_xfrm_state2msg(x); 1789 if (IS_ERR(out_skb)) 1790 return PTR_ERR(out_skb); 1791 1792 out_hdr = (struct sadb_msg *) out_skb->data; 1793 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1794 out_hdr->sadb_msg_type = SADB_DUMP; 1795 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1796 out_hdr->sadb_msg_errno = 0; 1797 out_hdr->sadb_msg_reserved = 0; 1798 out_hdr->sadb_msg_seq = count + 1; 1799 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1800 1801 if (pfk->dump.skb) 1802 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1803 &pfk->sk, sock_net(&pfk->sk)); 1804 pfk->dump.skb = out_skb; 1805 1806 return 0; 1807 } 1808 1809 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1810 { 1811 struct net *net = sock_net(&pfk->sk); 1812 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1813 } 1814 1815 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1816 { 1817 struct net *net = sock_net(&pfk->sk); 1818 1819 xfrm_state_walk_done(&pfk->dump.u.state, net); 1820 } 1821 1822 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1823 { 1824 u8 proto; 1825 struct xfrm_address_filter *filter = NULL; 1826 struct pfkey_sock *pfk = pfkey_sk(sk); 1827 1828 mutex_lock(&pfk->dump_lock); 1829 if (pfk->dump.dump != NULL) { 1830 mutex_unlock(&pfk->dump_lock); 1831 return -EBUSY; 1832 } 1833 1834 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1835 if (proto == 0) { 1836 mutex_unlock(&pfk->dump_lock); 1837 return -EINVAL; 1838 } 1839 1840 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1841 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1842 1843 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1844 if (filter == NULL) { 1845 mutex_unlock(&pfk->dump_lock); 1846 return -ENOMEM; 1847 } 1848 1849 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1850 sizeof(xfrm_address_t)); 1851 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1852 sizeof(xfrm_address_t)); 1853 filter->family = xfilter->sadb_x_filter_family; 1854 filter->splen = xfilter->sadb_x_filter_splen; 1855 filter->dplen = xfilter->sadb_x_filter_dplen; 1856 } 1857 1858 pfk->dump.msg_version = hdr->sadb_msg_version; 1859 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1860 pfk->dump.dump = pfkey_dump_sa; 1861 pfk->dump.done = pfkey_dump_sa_done; 1862 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1863 mutex_unlock(&pfk->dump_lock); 1864 1865 return pfkey_do_dump(pfk); 1866 } 1867 1868 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1869 { 1870 struct pfkey_sock *pfk = pfkey_sk(sk); 1871 int satype = hdr->sadb_msg_satype; 1872 bool reset_errno = false; 1873 1874 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1875 reset_errno = true; 1876 if (satype != 0 && satype != 1) 1877 return -EINVAL; 1878 pfk->promisc = satype; 1879 } 1880 if (reset_errno && skb_cloned(skb)) 1881 skb = skb_copy(skb, GFP_KERNEL); 1882 else 1883 skb = skb_clone(skb, GFP_KERNEL); 1884 1885 if (reset_errno && skb) { 1886 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1887 new_hdr->sadb_msg_errno = 0; 1888 } 1889 1890 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1891 return 0; 1892 } 1893 1894 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1895 { 1896 int i; 1897 u32 reqid = *(u32*)ptr; 1898 1899 for (i=0; i<xp->xfrm_nr; i++) { 1900 if (xp->xfrm_vec[i].reqid == reqid) 1901 return -EEXIST; 1902 } 1903 return 0; 1904 } 1905 1906 static u32 gen_reqid(struct net *net) 1907 { 1908 struct xfrm_policy_walk walk; 1909 u32 start; 1910 int rc; 1911 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1912 1913 start = reqid; 1914 do { 1915 ++reqid; 1916 if (reqid == 0) 1917 reqid = IPSEC_MANUAL_REQID_MAX+1; 1918 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1919 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1920 xfrm_policy_walk_done(&walk, net); 1921 if (rc != -EEXIST) 1922 return reqid; 1923 } while (reqid != start); 1924 return 0; 1925 } 1926 1927 static int 1928 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1929 { 1930 struct net *net = xp_net(xp); 1931 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1932 int mode; 1933 1934 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1935 return -ELOOP; 1936 1937 if (rq->sadb_x_ipsecrequest_mode == 0) 1938 return -EINVAL; 1939 1940 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1941 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1942 return -EINVAL; 1943 t->mode = mode; 1944 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1945 t->optional = 1; 1946 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1947 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1948 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1949 t->reqid = 0; 1950 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1951 return -ENOBUFS; 1952 } 1953 1954 /* addresses present only in tunnel mode */ 1955 if (t->mode == XFRM_MODE_TUNNEL) { 1956 int err; 1957 1958 err = parse_sockaddr_pair( 1959 (struct sockaddr *)(rq + 1), 1960 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1961 &t->saddr, &t->id.daddr, &t->encap_family); 1962 if (err) 1963 return err; 1964 } else 1965 t->encap_family = xp->family; 1966 1967 /* No way to set this via kame pfkey */ 1968 t->allalgs = 1; 1969 xp->xfrm_nr++; 1970 return 0; 1971 } 1972 1973 static int 1974 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1975 { 1976 int err; 1977 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1978 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1979 1980 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1981 return -EINVAL; 1982 1983 while (len >= sizeof(*rq)) { 1984 if (len < rq->sadb_x_ipsecrequest_len || 1985 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 1986 return -EINVAL; 1987 1988 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1989 return err; 1990 len -= rq->sadb_x_ipsecrequest_len; 1991 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1992 } 1993 return 0; 1994 } 1995 1996 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1997 { 1998 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1999 2000 if (xfrm_ctx) { 2001 int len = sizeof(struct sadb_x_sec_ctx); 2002 len += xfrm_ctx->ctx_len; 2003 return PFKEY_ALIGN8(len); 2004 } 2005 return 0; 2006 } 2007 2008 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2009 { 2010 const struct xfrm_tmpl *t; 2011 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2012 int socklen = 0; 2013 int i; 2014 2015 for (i=0; i<xp->xfrm_nr; i++) { 2016 t = xp->xfrm_vec + i; 2017 socklen += pfkey_sockaddr_len(t->encap_family); 2018 } 2019 2020 return sizeof(struct sadb_msg) + 2021 (sizeof(struct sadb_lifetime) * 3) + 2022 (sizeof(struct sadb_address) * 2) + 2023 (sockaddr_size * 2) + 2024 sizeof(struct sadb_x_policy) + 2025 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2026 (socklen * 2) + 2027 pfkey_xfrm_policy2sec_ctx_size(xp); 2028 } 2029 2030 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2031 { 2032 struct sk_buff *skb; 2033 int size; 2034 2035 size = pfkey_xfrm_policy2msg_size(xp); 2036 2037 skb = alloc_skb(size + 16, GFP_ATOMIC); 2038 if (skb == NULL) 2039 return ERR_PTR(-ENOBUFS); 2040 2041 return skb; 2042 } 2043 2044 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2045 { 2046 struct sadb_msg *hdr; 2047 struct sadb_address *addr; 2048 struct sadb_lifetime *lifetime; 2049 struct sadb_x_policy *pol; 2050 struct sadb_x_sec_ctx *sec_ctx; 2051 struct xfrm_sec_ctx *xfrm_ctx; 2052 int i; 2053 int size; 2054 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2055 int socklen = pfkey_sockaddr_len(xp->family); 2056 2057 size = pfkey_xfrm_policy2msg_size(xp); 2058 2059 /* call should fill header later */ 2060 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2061 memset(hdr, 0, size); /* XXX do we need this ? */ 2062 2063 /* src address */ 2064 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2065 addr->sadb_address_len = 2066 (sizeof(struct sadb_address)+sockaddr_size)/ 2067 sizeof(uint64_t); 2068 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2069 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2070 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2071 addr->sadb_address_reserved = 0; 2072 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2073 xp->selector.sport, 2074 (struct sockaddr *) (addr + 1), 2075 xp->family)) 2076 BUG(); 2077 2078 /* dst address */ 2079 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2080 addr->sadb_address_len = 2081 (sizeof(struct sadb_address)+sockaddr_size)/ 2082 sizeof(uint64_t); 2083 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2084 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2085 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2086 addr->sadb_address_reserved = 0; 2087 2088 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2089 (struct sockaddr *) (addr + 1), 2090 xp->family); 2091 2092 /* hard time */ 2093 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2094 lifetime->sadb_lifetime_len = 2095 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2096 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2097 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2098 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2099 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2100 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2101 /* soft time */ 2102 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2103 lifetime->sadb_lifetime_len = 2104 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2105 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2106 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2107 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2108 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2109 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2110 /* current time */ 2111 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2112 lifetime->sadb_lifetime_len = 2113 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2114 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2115 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2116 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2117 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2118 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2119 2120 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2121 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2122 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2123 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2124 if (xp->action == XFRM_POLICY_ALLOW) { 2125 if (xp->xfrm_nr) 2126 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2127 else 2128 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2129 } 2130 pol->sadb_x_policy_dir = dir+1; 2131 pol->sadb_x_policy_reserved = 0; 2132 pol->sadb_x_policy_id = xp->index; 2133 pol->sadb_x_policy_priority = xp->priority; 2134 2135 for (i=0; i<xp->xfrm_nr; i++) { 2136 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2137 struct sadb_x_ipsecrequest *rq; 2138 int req_size; 2139 int mode; 2140 2141 req_size = sizeof(struct sadb_x_ipsecrequest); 2142 if (t->mode == XFRM_MODE_TUNNEL) { 2143 socklen = pfkey_sockaddr_len(t->encap_family); 2144 req_size += socklen * 2; 2145 } else { 2146 size -= 2*socklen; 2147 } 2148 rq = skb_put(skb, req_size); 2149 pol->sadb_x_policy_len += req_size/8; 2150 memset(rq, 0, sizeof(*rq)); 2151 rq->sadb_x_ipsecrequest_len = req_size; 2152 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2153 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2154 return -EINVAL; 2155 rq->sadb_x_ipsecrequest_mode = mode; 2156 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2157 if (t->reqid) 2158 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2159 if (t->optional) 2160 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2161 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2162 2163 if (t->mode == XFRM_MODE_TUNNEL) { 2164 u8 *sa = (void *)(rq + 1); 2165 pfkey_sockaddr_fill(&t->saddr, 0, 2166 (struct sockaddr *)sa, 2167 t->encap_family); 2168 pfkey_sockaddr_fill(&t->id.daddr, 0, 2169 (struct sockaddr *) (sa + socklen), 2170 t->encap_family); 2171 } 2172 } 2173 2174 /* security context */ 2175 if ((xfrm_ctx = xp->security)) { 2176 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2177 2178 sec_ctx = skb_put(skb, ctx_size); 2179 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2180 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2181 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2182 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2183 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2184 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2185 xfrm_ctx->ctx_len); 2186 } 2187 2188 hdr->sadb_msg_len = size / sizeof(uint64_t); 2189 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2190 2191 return 0; 2192 } 2193 2194 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2195 { 2196 struct sk_buff *out_skb; 2197 struct sadb_msg *out_hdr; 2198 int err; 2199 2200 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2201 if (IS_ERR(out_skb)) 2202 return PTR_ERR(out_skb); 2203 2204 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2205 if (err < 0) { 2206 kfree_skb(out_skb); 2207 return err; 2208 } 2209 2210 out_hdr = (struct sadb_msg *) out_skb->data; 2211 out_hdr->sadb_msg_version = PF_KEY_V2; 2212 2213 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2214 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2215 else 2216 out_hdr->sadb_msg_type = event2poltype(c->event); 2217 out_hdr->sadb_msg_errno = 0; 2218 out_hdr->sadb_msg_seq = c->seq; 2219 out_hdr->sadb_msg_pid = c->portid; 2220 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2221 return 0; 2222 2223 } 2224 2225 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2226 { 2227 struct net *net = sock_net(sk); 2228 int err = 0; 2229 struct sadb_lifetime *lifetime; 2230 struct sadb_address *sa; 2231 struct sadb_x_policy *pol; 2232 struct xfrm_policy *xp; 2233 struct km_event c; 2234 struct sadb_x_sec_ctx *sec_ctx; 2235 2236 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2237 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2238 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2239 return -EINVAL; 2240 2241 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2242 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2243 return -EINVAL; 2244 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2245 return -EINVAL; 2246 2247 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2248 if (xp == NULL) 2249 return -ENOBUFS; 2250 2251 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2252 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2253 xp->priority = pol->sadb_x_policy_priority; 2254 2255 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2256 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2257 xp->selector.family = xp->family; 2258 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2259 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2260 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2261 if (xp->selector.sport) 2262 xp->selector.sport_mask = htons(0xffff); 2263 2264 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2265 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2266 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2267 2268 /* Amusing, we set this twice. KAME apps appear to set same value 2269 * in both addresses. 2270 */ 2271 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2272 2273 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2274 if (xp->selector.dport) 2275 xp->selector.dport_mask = htons(0xffff); 2276 2277 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2278 if (sec_ctx != NULL) { 2279 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2280 2281 if (!uctx) { 2282 err = -ENOBUFS; 2283 goto out; 2284 } 2285 2286 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2287 kfree(uctx); 2288 2289 if (err) 2290 goto out; 2291 } 2292 2293 xp->lft.soft_byte_limit = XFRM_INF; 2294 xp->lft.hard_byte_limit = XFRM_INF; 2295 xp->lft.soft_packet_limit = XFRM_INF; 2296 xp->lft.hard_packet_limit = XFRM_INF; 2297 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2298 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2299 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2300 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2301 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2302 } 2303 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2304 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2305 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2306 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2307 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2308 } 2309 xp->xfrm_nr = 0; 2310 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2311 (err = parse_ipsecrequests(xp, pol)) < 0) 2312 goto out; 2313 2314 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2315 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2316 2317 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2318 2319 if (err) 2320 goto out; 2321 2322 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2323 c.event = XFRM_MSG_UPDPOLICY; 2324 else 2325 c.event = XFRM_MSG_NEWPOLICY; 2326 2327 c.seq = hdr->sadb_msg_seq; 2328 c.portid = hdr->sadb_msg_pid; 2329 2330 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2331 xfrm_pol_put(xp); 2332 return 0; 2333 2334 out: 2335 xp->walk.dead = 1; 2336 xfrm_policy_destroy(xp); 2337 return err; 2338 } 2339 2340 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2341 { 2342 struct net *net = sock_net(sk); 2343 int err; 2344 struct sadb_address *sa; 2345 struct sadb_x_policy *pol; 2346 struct xfrm_policy *xp; 2347 struct xfrm_selector sel; 2348 struct km_event c; 2349 struct sadb_x_sec_ctx *sec_ctx; 2350 struct xfrm_sec_ctx *pol_ctx = NULL; 2351 2352 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2353 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2354 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2355 return -EINVAL; 2356 2357 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2358 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2359 return -EINVAL; 2360 2361 memset(&sel, 0, sizeof(sel)); 2362 2363 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2364 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2365 sel.prefixlen_s = sa->sadb_address_prefixlen; 2366 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2367 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2368 if (sel.sport) 2369 sel.sport_mask = htons(0xffff); 2370 2371 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2372 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2373 sel.prefixlen_d = sa->sadb_address_prefixlen; 2374 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2375 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2376 if (sel.dport) 2377 sel.dport_mask = htons(0xffff); 2378 2379 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2380 if (sec_ctx != NULL) { 2381 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2382 2383 if (!uctx) 2384 return -ENOMEM; 2385 2386 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2387 kfree(uctx); 2388 if (err) 2389 return err; 2390 } 2391 2392 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2393 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2394 1, &err); 2395 security_xfrm_policy_free(pol_ctx); 2396 if (xp == NULL) 2397 return -ENOENT; 2398 2399 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2400 2401 if (err) 2402 goto out; 2403 2404 c.seq = hdr->sadb_msg_seq; 2405 c.portid = hdr->sadb_msg_pid; 2406 c.data.byid = 0; 2407 c.event = XFRM_MSG_DELPOLICY; 2408 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2409 2410 out: 2411 xfrm_pol_put(xp); 2412 return err; 2413 } 2414 2415 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2416 { 2417 int err; 2418 struct sk_buff *out_skb; 2419 struct sadb_msg *out_hdr; 2420 err = 0; 2421 2422 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2423 if (IS_ERR(out_skb)) { 2424 err = PTR_ERR(out_skb); 2425 goto out; 2426 } 2427 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2428 if (err < 0) 2429 goto out; 2430 2431 out_hdr = (struct sadb_msg *) out_skb->data; 2432 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2433 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2434 out_hdr->sadb_msg_satype = 0; 2435 out_hdr->sadb_msg_errno = 0; 2436 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2437 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2438 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2439 err = 0; 2440 2441 out: 2442 return err; 2443 } 2444 2445 static int pfkey_sockaddr_pair_size(sa_family_t family) 2446 { 2447 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2448 } 2449 2450 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2451 xfrm_address_t *saddr, xfrm_address_t *daddr, 2452 u16 *family) 2453 { 2454 int af, socklen; 2455 2456 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2457 return -EINVAL; 2458 2459 af = pfkey_sockaddr_extract(sa, saddr); 2460 if (!af) 2461 return -EINVAL; 2462 2463 socklen = pfkey_sockaddr_len(af); 2464 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2465 daddr) != af) 2466 return -EINVAL; 2467 2468 *family = af; 2469 return 0; 2470 } 2471 2472 #ifdef CONFIG_NET_KEY_MIGRATE 2473 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2474 struct xfrm_migrate *m) 2475 { 2476 int err; 2477 struct sadb_x_ipsecrequest *rq2; 2478 int mode; 2479 2480 if (len < sizeof(*rq1) || 2481 len < rq1->sadb_x_ipsecrequest_len || 2482 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2483 return -EINVAL; 2484 2485 /* old endoints */ 2486 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2487 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2488 &m->old_saddr, &m->old_daddr, 2489 &m->old_family); 2490 if (err) 2491 return err; 2492 2493 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2494 len -= rq1->sadb_x_ipsecrequest_len; 2495 2496 if (len <= sizeof(*rq2) || 2497 len < rq2->sadb_x_ipsecrequest_len || 2498 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2499 return -EINVAL; 2500 2501 /* new endpoints */ 2502 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2503 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2504 &m->new_saddr, &m->new_daddr, 2505 &m->new_family); 2506 if (err) 2507 return err; 2508 2509 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2510 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2511 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2512 return -EINVAL; 2513 2514 m->proto = rq1->sadb_x_ipsecrequest_proto; 2515 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2516 return -EINVAL; 2517 m->mode = mode; 2518 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2519 2520 return ((int)(rq1->sadb_x_ipsecrequest_len + 2521 rq2->sadb_x_ipsecrequest_len)); 2522 } 2523 2524 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2525 const struct sadb_msg *hdr, void * const *ext_hdrs) 2526 { 2527 int i, len, ret, err = -EINVAL; 2528 u8 dir; 2529 struct sadb_address *sa; 2530 struct sadb_x_kmaddress *kma; 2531 struct sadb_x_policy *pol; 2532 struct sadb_x_ipsecrequest *rq; 2533 struct xfrm_selector sel; 2534 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2535 struct xfrm_kmaddress k; 2536 struct net *net = sock_net(sk); 2537 2538 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2539 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2540 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2541 err = -EINVAL; 2542 goto out; 2543 } 2544 2545 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2546 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2547 2548 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2549 err = -EINVAL; 2550 goto out; 2551 } 2552 2553 if (kma) { 2554 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2555 k.reserved = kma->sadb_x_kmaddress_reserved; 2556 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2557 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2558 &k.local, &k.remote, &k.family); 2559 if (ret < 0) { 2560 err = ret; 2561 goto out; 2562 } 2563 } 2564 2565 dir = pol->sadb_x_policy_dir - 1; 2566 memset(&sel, 0, sizeof(sel)); 2567 2568 /* set source address info of selector */ 2569 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2570 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2571 sel.prefixlen_s = sa->sadb_address_prefixlen; 2572 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2573 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2574 if (sel.sport) 2575 sel.sport_mask = htons(0xffff); 2576 2577 /* set destination address info of selector */ 2578 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2579 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2580 sel.prefixlen_d = sa->sadb_address_prefixlen; 2581 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2582 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2583 if (sel.dport) 2584 sel.dport_mask = htons(0xffff); 2585 2586 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2587 2588 /* extract ipsecrequests */ 2589 i = 0; 2590 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2591 2592 while (len > 0 && i < XFRM_MAX_DEPTH) { 2593 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2594 if (ret < 0) { 2595 err = ret; 2596 goto out; 2597 } else { 2598 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2599 len -= ret; 2600 i++; 2601 } 2602 } 2603 2604 if (!i || len > 0) { 2605 err = -EINVAL; 2606 goto out; 2607 } 2608 2609 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2610 kma ? &k : NULL, net, NULL); 2611 2612 out: 2613 return err; 2614 } 2615 #else 2616 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2617 const struct sadb_msg *hdr, void * const *ext_hdrs) 2618 { 2619 return -ENOPROTOOPT; 2620 } 2621 #endif 2622 2623 2624 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2625 { 2626 struct net *net = sock_net(sk); 2627 unsigned int dir; 2628 int err = 0, delete; 2629 struct sadb_x_policy *pol; 2630 struct xfrm_policy *xp; 2631 struct km_event c; 2632 2633 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2634 return -EINVAL; 2635 2636 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2637 if (dir >= XFRM_POLICY_MAX) 2638 return -EINVAL; 2639 2640 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2641 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2642 dir, pol->sadb_x_policy_id, delete, &err); 2643 if (xp == NULL) 2644 return -ENOENT; 2645 2646 if (delete) { 2647 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2648 2649 if (err) 2650 goto out; 2651 c.seq = hdr->sadb_msg_seq; 2652 c.portid = hdr->sadb_msg_pid; 2653 c.data.byid = 1; 2654 c.event = XFRM_MSG_DELPOLICY; 2655 km_policy_notify(xp, dir, &c); 2656 } else { 2657 err = key_pol_get_resp(sk, xp, hdr, dir); 2658 } 2659 2660 out: 2661 xfrm_pol_put(xp); 2662 return err; 2663 } 2664 2665 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2666 { 2667 struct pfkey_sock *pfk = ptr; 2668 struct sk_buff *out_skb; 2669 struct sadb_msg *out_hdr; 2670 int err; 2671 2672 if (!pfkey_can_dump(&pfk->sk)) 2673 return -ENOBUFS; 2674 2675 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2676 if (IS_ERR(out_skb)) 2677 return PTR_ERR(out_skb); 2678 2679 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2680 if (err < 0) 2681 return err; 2682 2683 out_hdr = (struct sadb_msg *) out_skb->data; 2684 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2685 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2686 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2687 out_hdr->sadb_msg_errno = 0; 2688 out_hdr->sadb_msg_seq = count + 1; 2689 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2690 2691 if (pfk->dump.skb) 2692 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2693 &pfk->sk, sock_net(&pfk->sk)); 2694 pfk->dump.skb = out_skb; 2695 2696 return 0; 2697 } 2698 2699 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2700 { 2701 struct net *net = sock_net(&pfk->sk); 2702 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2703 } 2704 2705 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2706 { 2707 struct net *net = sock_net((struct sock *)pfk); 2708 2709 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2710 } 2711 2712 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2713 { 2714 struct pfkey_sock *pfk = pfkey_sk(sk); 2715 2716 mutex_lock(&pfk->dump_lock); 2717 if (pfk->dump.dump != NULL) { 2718 mutex_unlock(&pfk->dump_lock); 2719 return -EBUSY; 2720 } 2721 2722 pfk->dump.msg_version = hdr->sadb_msg_version; 2723 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2724 pfk->dump.dump = pfkey_dump_sp; 2725 pfk->dump.done = pfkey_dump_sp_done; 2726 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2727 mutex_unlock(&pfk->dump_lock); 2728 2729 return pfkey_do_dump(pfk); 2730 } 2731 2732 static int key_notify_policy_flush(const struct km_event *c) 2733 { 2734 struct sk_buff *skb_out; 2735 struct sadb_msg *hdr; 2736 2737 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2738 if (!skb_out) 2739 return -ENOBUFS; 2740 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2741 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2742 hdr->sadb_msg_seq = c->seq; 2743 hdr->sadb_msg_pid = c->portid; 2744 hdr->sadb_msg_version = PF_KEY_V2; 2745 hdr->sadb_msg_errno = (uint8_t) 0; 2746 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2747 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2748 hdr->sadb_msg_reserved = 0; 2749 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2750 return 0; 2751 2752 } 2753 2754 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2755 { 2756 struct net *net = sock_net(sk); 2757 struct km_event c; 2758 int err, err2; 2759 2760 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2761 err2 = unicast_flush_resp(sk, hdr); 2762 if (err || err2) { 2763 if (err == -ESRCH) /* empty table - old silent behavior */ 2764 return 0; 2765 return err; 2766 } 2767 2768 c.data.type = XFRM_POLICY_TYPE_MAIN; 2769 c.event = XFRM_MSG_FLUSHPOLICY; 2770 c.portid = hdr->sadb_msg_pid; 2771 c.seq = hdr->sadb_msg_seq; 2772 c.net = net; 2773 km_policy_notify(NULL, 0, &c); 2774 2775 return 0; 2776 } 2777 2778 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2779 const struct sadb_msg *hdr, void * const *ext_hdrs); 2780 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2781 [SADB_RESERVED] = pfkey_reserved, 2782 [SADB_GETSPI] = pfkey_getspi, 2783 [SADB_UPDATE] = pfkey_add, 2784 [SADB_ADD] = pfkey_add, 2785 [SADB_DELETE] = pfkey_delete, 2786 [SADB_GET] = pfkey_get, 2787 [SADB_ACQUIRE] = pfkey_acquire, 2788 [SADB_REGISTER] = pfkey_register, 2789 [SADB_EXPIRE] = NULL, 2790 [SADB_FLUSH] = pfkey_flush, 2791 [SADB_DUMP] = pfkey_dump, 2792 [SADB_X_PROMISC] = pfkey_promisc, 2793 [SADB_X_PCHANGE] = NULL, 2794 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2795 [SADB_X_SPDADD] = pfkey_spdadd, 2796 [SADB_X_SPDDELETE] = pfkey_spddelete, 2797 [SADB_X_SPDGET] = pfkey_spdget, 2798 [SADB_X_SPDACQUIRE] = NULL, 2799 [SADB_X_SPDDUMP] = pfkey_spddump, 2800 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2801 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2802 [SADB_X_SPDDELETE2] = pfkey_spdget, 2803 [SADB_X_MIGRATE] = pfkey_migrate, 2804 }; 2805 2806 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2807 { 2808 void *ext_hdrs[SADB_EXT_MAX]; 2809 int err; 2810 2811 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2812 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2813 2814 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2815 err = parse_exthdrs(skb, hdr, ext_hdrs); 2816 if (!err) { 2817 err = -EOPNOTSUPP; 2818 if (pfkey_funcs[hdr->sadb_msg_type]) 2819 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2820 } 2821 return err; 2822 } 2823 2824 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2825 { 2826 struct sadb_msg *hdr = NULL; 2827 2828 if (skb->len < sizeof(*hdr)) { 2829 *errp = -EMSGSIZE; 2830 } else { 2831 hdr = (struct sadb_msg *) skb->data; 2832 if (hdr->sadb_msg_version != PF_KEY_V2 || 2833 hdr->sadb_msg_reserved != 0 || 2834 (hdr->sadb_msg_type <= SADB_RESERVED || 2835 hdr->sadb_msg_type > SADB_MAX)) { 2836 hdr = NULL; 2837 *errp = -EINVAL; 2838 } else if (hdr->sadb_msg_len != (skb->len / 2839 sizeof(uint64_t)) || 2840 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2841 sizeof(uint64_t))) { 2842 hdr = NULL; 2843 *errp = -EMSGSIZE; 2844 } else { 2845 *errp = 0; 2846 } 2847 } 2848 return hdr; 2849 } 2850 2851 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2852 const struct xfrm_algo_desc *d) 2853 { 2854 unsigned int id = d->desc.sadb_alg_id; 2855 2856 if (id >= sizeof(t->aalgos) * 8) 2857 return 0; 2858 2859 return (t->aalgos >> id) & 1; 2860 } 2861 2862 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2863 const struct xfrm_algo_desc *d) 2864 { 2865 unsigned int id = d->desc.sadb_alg_id; 2866 2867 if (id >= sizeof(t->ealgos) * 8) 2868 return 0; 2869 2870 return (t->ealgos >> id) & 1; 2871 } 2872 2873 static int count_ah_combs(const struct xfrm_tmpl *t) 2874 { 2875 int i, sz = 0; 2876 2877 for (i = 0; ; i++) { 2878 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2879 if (!aalg) 2880 break; 2881 if (!aalg->pfkey_supported) 2882 continue; 2883 if (aalg_tmpl_set(t, aalg) && aalg->available) 2884 sz += sizeof(struct sadb_comb); 2885 } 2886 return sz + sizeof(struct sadb_prop); 2887 } 2888 2889 static int count_esp_combs(const struct xfrm_tmpl *t) 2890 { 2891 int i, k, sz = 0; 2892 2893 for (i = 0; ; i++) { 2894 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2895 if (!ealg) 2896 break; 2897 2898 if (!ealg->pfkey_supported) 2899 continue; 2900 2901 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2902 continue; 2903 2904 for (k = 1; ; k++) { 2905 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2906 if (!aalg) 2907 break; 2908 2909 if (!aalg->pfkey_supported) 2910 continue; 2911 2912 if (aalg_tmpl_set(t, aalg) && aalg->available) 2913 sz += sizeof(struct sadb_comb); 2914 } 2915 } 2916 return sz + sizeof(struct sadb_prop); 2917 } 2918 2919 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2920 { 2921 struct sadb_prop *p; 2922 int i; 2923 2924 p = skb_put(skb, sizeof(struct sadb_prop)); 2925 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2926 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2927 p->sadb_prop_replay = 32; 2928 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2929 2930 for (i = 0; ; i++) { 2931 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2932 if (!aalg) 2933 break; 2934 2935 if (!aalg->pfkey_supported) 2936 continue; 2937 2938 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2939 struct sadb_comb *c; 2940 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2941 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2942 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2943 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2944 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2945 c->sadb_comb_hard_addtime = 24*60*60; 2946 c->sadb_comb_soft_addtime = 20*60*60; 2947 c->sadb_comb_hard_usetime = 8*60*60; 2948 c->sadb_comb_soft_usetime = 7*60*60; 2949 } 2950 } 2951 } 2952 2953 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2954 { 2955 struct sadb_prop *p; 2956 int i, k; 2957 2958 p = skb_put(skb, sizeof(struct sadb_prop)); 2959 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2960 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2961 p->sadb_prop_replay = 32; 2962 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2963 2964 for (i=0; ; i++) { 2965 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2966 if (!ealg) 2967 break; 2968 2969 if (!ealg->pfkey_supported) 2970 continue; 2971 2972 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2973 continue; 2974 2975 for (k = 1; ; k++) { 2976 struct sadb_comb *c; 2977 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2978 if (!aalg) 2979 break; 2980 if (!aalg->pfkey_supported) 2981 continue; 2982 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2983 continue; 2984 c = skb_put(skb, sizeof(struct sadb_comb)); 2985 memset(c, 0, sizeof(*c)); 2986 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2987 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2988 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2989 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2990 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2991 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2992 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2993 c->sadb_comb_hard_addtime = 24*60*60; 2994 c->sadb_comb_soft_addtime = 20*60*60; 2995 c->sadb_comb_hard_usetime = 8*60*60; 2996 c->sadb_comb_soft_usetime = 7*60*60; 2997 } 2998 } 2999 } 3000 3001 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3002 { 3003 return 0; 3004 } 3005 3006 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3007 { 3008 struct sk_buff *out_skb; 3009 struct sadb_msg *out_hdr; 3010 int hard; 3011 int hsc; 3012 3013 hard = c->data.hard; 3014 if (hard) 3015 hsc = 2; 3016 else 3017 hsc = 1; 3018 3019 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3020 if (IS_ERR(out_skb)) 3021 return PTR_ERR(out_skb); 3022 3023 out_hdr = (struct sadb_msg *) out_skb->data; 3024 out_hdr->sadb_msg_version = PF_KEY_V2; 3025 out_hdr->sadb_msg_type = SADB_EXPIRE; 3026 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3027 out_hdr->sadb_msg_errno = 0; 3028 out_hdr->sadb_msg_reserved = 0; 3029 out_hdr->sadb_msg_seq = 0; 3030 out_hdr->sadb_msg_pid = 0; 3031 3032 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3033 xs_net(x)); 3034 return 0; 3035 } 3036 3037 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3038 { 3039 struct net *net = x ? xs_net(x) : c->net; 3040 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3041 3042 if (atomic_read(&net_pfkey->socks_nr) == 0) 3043 return 0; 3044 3045 switch (c->event) { 3046 case XFRM_MSG_EXPIRE: 3047 return key_notify_sa_expire(x, c); 3048 case XFRM_MSG_DELSA: 3049 case XFRM_MSG_NEWSA: 3050 case XFRM_MSG_UPDSA: 3051 return key_notify_sa(x, c); 3052 case XFRM_MSG_FLUSHSA: 3053 return key_notify_sa_flush(c); 3054 case XFRM_MSG_NEWAE: /* not yet supported */ 3055 break; 3056 default: 3057 pr_err("pfkey: Unknown SA event %d\n", c->event); 3058 break; 3059 } 3060 3061 return 0; 3062 } 3063 3064 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3065 { 3066 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3067 return 0; 3068 3069 switch (c->event) { 3070 case XFRM_MSG_POLEXPIRE: 3071 return key_notify_policy_expire(xp, c); 3072 case XFRM_MSG_DELPOLICY: 3073 case XFRM_MSG_NEWPOLICY: 3074 case XFRM_MSG_UPDPOLICY: 3075 return key_notify_policy(xp, dir, c); 3076 case XFRM_MSG_FLUSHPOLICY: 3077 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3078 break; 3079 return key_notify_policy_flush(c); 3080 default: 3081 pr_err("pfkey: Unknown policy event %d\n", c->event); 3082 break; 3083 } 3084 3085 return 0; 3086 } 3087 3088 static u32 get_acqseq(void) 3089 { 3090 u32 res; 3091 static atomic_t acqseq; 3092 3093 do { 3094 res = atomic_inc_return(&acqseq); 3095 } while (!res); 3096 return res; 3097 } 3098 3099 static bool pfkey_is_alive(const struct km_event *c) 3100 { 3101 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3102 struct sock *sk; 3103 bool is_alive = false; 3104 3105 rcu_read_lock(); 3106 sk_for_each_rcu(sk, &net_pfkey->table) { 3107 if (pfkey_sk(sk)->registered) { 3108 is_alive = true; 3109 break; 3110 } 3111 } 3112 rcu_read_unlock(); 3113 3114 return is_alive; 3115 } 3116 3117 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3118 { 3119 struct sk_buff *skb; 3120 struct sadb_msg *hdr; 3121 struct sadb_address *addr; 3122 struct sadb_x_policy *pol; 3123 int sockaddr_size; 3124 int size; 3125 struct sadb_x_sec_ctx *sec_ctx; 3126 struct xfrm_sec_ctx *xfrm_ctx; 3127 int ctx_size = 0; 3128 3129 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3130 if (!sockaddr_size) 3131 return -EINVAL; 3132 3133 size = sizeof(struct sadb_msg) + 3134 (sizeof(struct sadb_address) * 2) + 3135 (sockaddr_size * 2) + 3136 sizeof(struct sadb_x_policy); 3137 3138 if (x->id.proto == IPPROTO_AH) 3139 size += count_ah_combs(t); 3140 else if (x->id.proto == IPPROTO_ESP) 3141 size += count_esp_combs(t); 3142 3143 if ((xfrm_ctx = x->security)) { 3144 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3145 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3146 } 3147 3148 skb = alloc_skb(size + 16, GFP_ATOMIC); 3149 if (skb == NULL) 3150 return -ENOMEM; 3151 3152 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3153 hdr->sadb_msg_version = PF_KEY_V2; 3154 hdr->sadb_msg_type = SADB_ACQUIRE; 3155 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3156 hdr->sadb_msg_len = size / sizeof(uint64_t); 3157 hdr->sadb_msg_errno = 0; 3158 hdr->sadb_msg_reserved = 0; 3159 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3160 hdr->sadb_msg_pid = 0; 3161 3162 /* src address */ 3163 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3164 addr->sadb_address_len = 3165 (sizeof(struct sadb_address)+sockaddr_size)/ 3166 sizeof(uint64_t); 3167 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3168 addr->sadb_address_proto = 0; 3169 addr->sadb_address_reserved = 0; 3170 addr->sadb_address_prefixlen = 3171 pfkey_sockaddr_fill(&x->props.saddr, 0, 3172 (struct sockaddr *) (addr + 1), 3173 x->props.family); 3174 if (!addr->sadb_address_prefixlen) 3175 BUG(); 3176 3177 /* dst address */ 3178 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3179 addr->sadb_address_len = 3180 (sizeof(struct sadb_address)+sockaddr_size)/ 3181 sizeof(uint64_t); 3182 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3183 addr->sadb_address_proto = 0; 3184 addr->sadb_address_reserved = 0; 3185 addr->sadb_address_prefixlen = 3186 pfkey_sockaddr_fill(&x->id.daddr, 0, 3187 (struct sockaddr *) (addr + 1), 3188 x->props.family); 3189 if (!addr->sadb_address_prefixlen) 3190 BUG(); 3191 3192 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3193 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3194 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3195 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3196 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3197 pol->sadb_x_policy_reserved = 0; 3198 pol->sadb_x_policy_id = xp->index; 3199 pol->sadb_x_policy_priority = xp->priority; 3200 3201 /* Set sadb_comb's. */ 3202 if (x->id.proto == IPPROTO_AH) 3203 dump_ah_combs(skb, t); 3204 else if (x->id.proto == IPPROTO_ESP) 3205 dump_esp_combs(skb, t); 3206 3207 /* security context */ 3208 if (xfrm_ctx) { 3209 sec_ctx = skb_put(skb, 3210 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3211 sec_ctx->sadb_x_sec_len = 3212 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3213 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3214 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3215 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3216 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3217 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3218 xfrm_ctx->ctx_len); 3219 } 3220 3221 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3222 xs_net(x)); 3223 } 3224 3225 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3226 u8 *data, int len, int *dir) 3227 { 3228 struct net *net = sock_net(sk); 3229 struct xfrm_policy *xp; 3230 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3231 struct sadb_x_sec_ctx *sec_ctx; 3232 3233 switch (sk->sk_family) { 3234 case AF_INET: 3235 if (opt != IP_IPSEC_POLICY) { 3236 *dir = -EOPNOTSUPP; 3237 return NULL; 3238 } 3239 break; 3240 #if IS_ENABLED(CONFIG_IPV6) 3241 case AF_INET6: 3242 if (opt != IPV6_IPSEC_POLICY) { 3243 *dir = -EOPNOTSUPP; 3244 return NULL; 3245 } 3246 break; 3247 #endif 3248 default: 3249 *dir = -EINVAL; 3250 return NULL; 3251 } 3252 3253 *dir = -EINVAL; 3254 3255 if (len < sizeof(struct sadb_x_policy) || 3256 pol->sadb_x_policy_len*8 > len || 3257 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3258 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3259 return NULL; 3260 3261 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3262 if (xp == NULL) { 3263 *dir = -ENOBUFS; 3264 return NULL; 3265 } 3266 3267 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3268 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3269 3270 xp->lft.soft_byte_limit = XFRM_INF; 3271 xp->lft.hard_byte_limit = XFRM_INF; 3272 xp->lft.soft_packet_limit = XFRM_INF; 3273 xp->lft.hard_packet_limit = XFRM_INF; 3274 xp->family = sk->sk_family; 3275 3276 xp->xfrm_nr = 0; 3277 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3278 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3279 goto out; 3280 3281 /* security context too */ 3282 if (len >= (pol->sadb_x_policy_len*8 + 3283 sizeof(struct sadb_x_sec_ctx))) { 3284 char *p = (char *)pol; 3285 struct xfrm_user_sec_ctx *uctx; 3286 3287 p += pol->sadb_x_policy_len*8; 3288 sec_ctx = (struct sadb_x_sec_ctx *)p; 3289 if (len < pol->sadb_x_policy_len*8 + 3290 sec_ctx->sadb_x_sec_len*8) { 3291 *dir = -EINVAL; 3292 goto out; 3293 } 3294 if ((*dir = verify_sec_ctx_len(p))) 3295 goto out; 3296 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3297 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3298 kfree(uctx); 3299 3300 if (*dir) 3301 goto out; 3302 } 3303 3304 *dir = pol->sadb_x_policy_dir-1; 3305 return xp; 3306 3307 out: 3308 xp->walk.dead = 1; 3309 xfrm_policy_destroy(xp); 3310 return NULL; 3311 } 3312 3313 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3314 { 3315 struct sk_buff *skb; 3316 struct sadb_msg *hdr; 3317 struct sadb_sa *sa; 3318 struct sadb_address *addr; 3319 struct sadb_x_nat_t_port *n_port; 3320 int sockaddr_size; 3321 int size; 3322 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3323 struct xfrm_encap_tmpl *natt = NULL; 3324 3325 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3326 if (!sockaddr_size) 3327 return -EINVAL; 3328 3329 if (!satype) 3330 return -EINVAL; 3331 3332 if (!x->encap) 3333 return -EINVAL; 3334 3335 natt = x->encap; 3336 3337 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3338 * 3339 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3340 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3341 */ 3342 3343 size = sizeof(struct sadb_msg) + 3344 sizeof(struct sadb_sa) + 3345 (sizeof(struct sadb_address) * 2) + 3346 (sockaddr_size * 2) + 3347 (sizeof(struct sadb_x_nat_t_port) * 2); 3348 3349 skb = alloc_skb(size + 16, GFP_ATOMIC); 3350 if (skb == NULL) 3351 return -ENOMEM; 3352 3353 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3354 hdr->sadb_msg_version = PF_KEY_V2; 3355 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3356 hdr->sadb_msg_satype = satype; 3357 hdr->sadb_msg_len = size / sizeof(uint64_t); 3358 hdr->sadb_msg_errno = 0; 3359 hdr->sadb_msg_reserved = 0; 3360 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3361 hdr->sadb_msg_pid = 0; 3362 3363 /* SA */ 3364 sa = skb_put(skb, sizeof(struct sadb_sa)); 3365 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3366 sa->sadb_sa_exttype = SADB_EXT_SA; 3367 sa->sadb_sa_spi = x->id.spi; 3368 sa->sadb_sa_replay = 0; 3369 sa->sadb_sa_state = 0; 3370 sa->sadb_sa_auth = 0; 3371 sa->sadb_sa_encrypt = 0; 3372 sa->sadb_sa_flags = 0; 3373 3374 /* ADDRESS_SRC (old addr) */ 3375 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3376 addr->sadb_address_len = 3377 (sizeof(struct sadb_address)+sockaddr_size)/ 3378 sizeof(uint64_t); 3379 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3380 addr->sadb_address_proto = 0; 3381 addr->sadb_address_reserved = 0; 3382 addr->sadb_address_prefixlen = 3383 pfkey_sockaddr_fill(&x->props.saddr, 0, 3384 (struct sockaddr *) (addr + 1), 3385 x->props.family); 3386 if (!addr->sadb_address_prefixlen) 3387 BUG(); 3388 3389 /* NAT_T_SPORT (old port) */ 3390 n_port = skb_put(skb, sizeof(*n_port)); 3391 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3392 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3393 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3394 n_port->sadb_x_nat_t_port_reserved = 0; 3395 3396 /* ADDRESS_DST (new addr) */ 3397 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3398 addr->sadb_address_len = 3399 (sizeof(struct sadb_address)+sockaddr_size)/ 3400 sizeof(uint64_t); 3401 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3402 addr->sadb_address_proto = 0; 3403 addr->sadb_address_reserved = 0; 3404 addr->sadb_address_prefixlen = 3405 pfkey_sockaddr_fill(ipaddr, 0, 3406 (struct sockaddr *) (addr + 1), 3407 x->props.family); 3408 if (!addr->sadb_address_prefixlen) 3409 BUG(); 3410 3411 /* NAT_T_DPORT (new port) */ 3412 n_port = skb_put(skb, sizeof(*n_port)); 3413 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3414 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3415 n_port->sadb_x_nat_t_port_port = sport; 3416 n_port->sadb_x_nat_t_port_reserved = 0; 3417 3418 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3419 xs_net(x)); 3420 } 3421 3422 #ifdef CONFIG_NET_KEY_MIGRATE 3423 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3424 const struct xfrm_selector *sel) 3425 { 3426 struct sadb_address *addr; 3427 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3428 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3429 addr->sadb_address_exttype = type; 3430 addr->sadb_address_proto = sel->proto; 3431 addr->sadb_address_reserved = 0; 3432 3433 switch (type) { 3434 case SADB_EXT_ADDRESS_SRC: 3435 addr->sadb_address_prefixlen = sel->prefixlen_s; 3436 pfkey_sockaddr_fill(&sel->saddr, 0, 3437 (struct sockaddr *)(addr + 1), 3438 sel->family); 3439 break; 3440 case SADB_EXT_ADDRESS_DST: 3441 addr->sadb_address_prefixlen = sel->prefixlen_d; 3442 pfkey_sockaddr_fill(&sel->daddr, 0, 3443 (struct sockaddr *)(addr + 1), 3444 sel->family); 3445 break; 3446 default: 3447 return -EINVAL; 3448 } 3449 3450 return 0; 3451 } 3452 3453 3454 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3455 { 3456 struct sadb_x_kmaddress *kma; 3457 u8 *sa; 3458 int family = k->family; 3459 int socklen = pfkey_sockaddr_len(family); 3460 int size_req; 3461 3462 size_req = (sizeof(struct sadb_x_kmaddress) + 3463 pfkey_sockaddr_pair_size(family)); 3464 3465 kma = skb_put_zero(skb, size_req); 3466 kma->sadb_x_kmaddress_len = size_req / 8; 3467 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3468 kma->sadb_x_kmaddress_reserved = k->reserved; 3469 3470 sa = (u8 *)(kma + 1); 3471 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3472 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3473 return -EINVAL; 3474 3475 return 0; 3476 } 3477 3478 static int set_ipsecrequest(struct sk_buff *skb, 3479 uint8_t proto, uint8_t mode, int level, 3480 uint32_t reqid, uint8_t family, 3481 const xfrm_address_t *src, const xfrm_address_t *dst) 3482 { 3483 struct sadb_x_ipsecrequest *rq; 3484 u8 *sa; 3485 int socklen = pfkey_sockaddr_len(family); 3486 int size_req; 3487 3488 size_req = sizeof(struct sadb_x_ipsecrequest) + 3489 pfkey_sockaddr_pair_size(family); 3490 3491 rq = skb_put_zero(skb, size_req); 3492 rq->sadb_x_ipsecrequest_len = size_req; 3493 rq->sadb_x_ipsecrequest_proto = proto; 3494 rq->sadb_x_ipsecrequest_mode = mode; 3495 rq->sadb_x_ipsecrequest_level = level; 3496 rq->sadb_x_ipsecrequest_reqid = reqid; 3497 3498 sa = (u8 *) (rq + 1); 3499 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3500 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3501 return -EINVAL; 3502 3503 return 0; 3504 } 3505 #endif 3506 3507 #ifdef CONFIG_NET_KEY_MIGRATE 3508 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3509 const struct xfrm_migrate *m, int num_bundles, 3510 const struct xfrm_kmaddress *k, 3511 const struct xfrm_encap_tmpl *encap) 3512 { 3513 int i; 3514 int sasize_sel; 3515 int size = 0; 3516 int size_pol = 0; 3517 struct sk_buff *skb; 3518 struct sadb_msg *hdr; 3519 struct sadb_x_policy *pol; 3520 const struct xfrm_migrate *mp; 3521 3522 if (type != XFRM_POLICY_TYPE_MAIN) 3523 return 0; 3524 3525 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3526 return -EINVAL; 3527 3528 if (k != NULL) { 3529 /* addresses for KM */ 3530 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3531 pfkey_sockaddr_pair_size(k->family)); 3532 } 3533 3534 /* selector */ 3535 sasize_sel = pfkey_sockaddr_size(sel->family); 3536 if (!sasize_sel) 3537 return -EINVAL; 3538 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3539 3540 /* policy info */ 3541 size_pol += sizeof(struct sadb_x_policy); 3542 3543 /* ipsecrequests */ 3544 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3545 /* old locator pair */ 3546 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3547 pfkey_sockaddr_pair_size(mp->old_family); 3548 /* new locator pair */ 3549 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3550 pfkey_sockaddr_pair_size(mp->new_family); 3551 } 3552 3553 size += sizeof(struct sadb_msg) + size_pol; 3554 3555 /* alloc buffer */ 3556 skb = alloc_skb(size, GFP_ATOMIC); 3557 if (skb == NULL) 3558 return -ENOMEM; 3559 3560 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3561 hdr->sadb_msg_version = PF_KEY_V2; 3562 hdr->sadb_msg_type = SADB_X_MIGRATE; 3563 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3564 hdr->sadb_msg_len = size / 8; 3565 hdr->sadb_msg_errno = 0; 3566 hdr->sadb_msg_reserved = 0; 3567 hdr->sadb_msg_seq = 0; 3568 hdr->sadb_msg_pid = 0; 3569 3570 /* Addresses to be used by KM for negotiation, if ext is available */ 3571 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3572 goto err; 3573 3574 /* selector src */ 3575 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3576 3577 /* selector dst */ 3578 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3579 3580 /* policy information */ 3581 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3582 pol->sadb_x_policy_len = size_pol / 8; 3583 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3584 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3585 pol->sadb_x_policy_dir = dir + 1; 3586 pol->sadb_x_policy_reserved = 0; 3587 pol->sadb_x_policy_id = 0; 3588 pol->sadb_x_policy_priority = 0; 3589 3590 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3591 /* old ipsecrequest */ 3592 int mode = pfkey_mode_from_xfrm(mp->mode); 3593 if (mode < 0) 3594 goto err; 3595 if (set_ipsecrequest(skb, mp->proto, mode, 3596 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3597 mp->reqid, mp->old_family, 3598 &mp->old_saddr, &mp->old_daddr) < 0) 3599 goto err; 3600 3601 /* new ipsecrequest */ 3602 if (set_ipsecrequest(skb, mp->proto, mode, 3603 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3604 mp->reqid, mp->new_family, 3605 &mp->new_saddr, &mp->new_daddr) < 0) 3606 goto err; 3607 } 3608 3609 /* broadcast migrate message to sockets */ 3610 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3611 3612 return 0; 3613 3614 err: 3615 kfree_skb(skb); 3616 return -EINVAL; 3617 } 3618 #else 3619 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3620 const struct xfrm_migrate *m, int num_bundles, 3621 const struct xfrm_kmaddress *k, 3622 const struct xfrm_encap_tmpl *encap) 3623 { 3624 return -ENOPROTOOPT; 3625 } 3626 #endif 3627 3628 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3629 { 3630 struct sock *sk = sock->sk; 3631 struct sk_buff *skb = NULL; 3632 struct sadb_msg *hdr = NULL; 3633 int err; 3634 struct net *net = sock_net(sk); 3635 3636 err = -EOPNOTSUPP; 3637 if (msg->msg_flags & MSG_OOB) 3638 goto out; 3639 3640 err = -EMSGSIZE; 3641 if ((unsigned int)len > sk->sk_sndbuf - 32) 3642 goto out; 3643 3644 err = -ENOBUFS; 3645 skb = alloc_skb(len, GFP_KERNEL); 3646 if (skb == NULL) 3647 goto out; 3648 3649 err = -EFAULT; 3650 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3651 goto out; 3652 3653 hdr = pfkey_get_base_msg(skb, &err); 3654 if (!hdr) 3655 goto out; 3656 3657 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3658 err = pfkey_process(sk, skb, hdr); 3659 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3660 3661 out: 3662 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3663 err = 0; 3664 kfree_skb(skb); 3665 3666 return err ? : len; 3667 } 3668 3669 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3670 int flags) 3671 { 3672 struct sock *sk = sock->sk; 3673 struct pfkey_sock *pfk = pfkey_sk(sk); 3674 struct sk_buff *skb; 3675 int copied, err; 3676 3677 err = -EINVAL; 3678 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3679 goto out; 3680 3681 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3682 if (skb == NULL) 3683 goto out; 3684 3685 copied = skb->len; 3686 if (copied > len) { 3687 msg->msg_flags |= MSG_TRUNC; 3688 copied = len; 3689 } 3690 3691 skb_reset_transport_header(skb); 3692 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3693 if (err) 3694 goto out_free; 3695 3696 sock_recv_ts_and_drops(msg, sk, skb); 3697 3698 err = (flags & MSG_TRUNC) ? skb->len : copied; 3699 3700 if (pfk->dump.dump != NULL && 3701 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3702 pfkey_do_dump(pfk); 3703 3704 out_free: 3705 skb_free_datagram(sk, skb); 3706 out: 3707 return err; 3708 } 3709 3710 static const struct proto_ops pfkey_ops = { 3711 .family = PF_KEY, 3712 .owner = THIS_MODULE, 3713 /* Operations that make no sense on pfkey sockets. */ 3714 .bind = sock_no_bind, 3715 .connect = sock_no_connect, 3716 .socketpair = sock_no_socketpair, 3717 .accept = sock_no_accept, 3718 .getname = sock_no_getname, 3719 .ioctl = sock_no_ioctl, 3720 .listen = sock_no_listen, 3721 .shutdown = sock_no_shutdown, 3722 .setsockopt = sock_no_setsockopt, 3723 .getsockopt = sock_no_getsockopt, 3724 .mmap = sock_no_mmap, 3725 .sendpage = sock_no_sendpage, 3726 3727 /* Now the operations that really occur. */ 3728 .release = pfkey_release, 3729 .poll = datagram_poll, 3730 .sendmsg = pfkey_sendmsg, 3731 .recvmsg = pfkey_recvmsg, 3732 }; 3733 3734 static const struct net_proto_family pfkey_family_ops = { 3735 .family = PF_KEY, 3736 .create = pfkey_create, 3737 .owner = THIS_MODULE, 3738 }; 3739 3740 #ifdef CONFIG_PROC_FS 3741 static int pfkey_seq_show(struct seq_file *f, void *v) 3742 { 3743 struct sock *s = sk_entry(v); 3744 3745 if (v == SEQ_START_TOKEN) 3746 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3747 else 3748 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3749 s, 3750 refcount_read(&s->sk_refcnt), 3751 sk_rmem_alloc_get(s), 3752 sk_wmem_alloc_get(s), 3753 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3754 sock_i_ino(s) 3755 ); 3756 return 0; 3757 } 3758 3759 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3760 __acquires(rcu) 3761 { 3762 struct net *net = seq_file_net(f); 3763 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3764 3765 rcu_read_lock(); 3766 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3767 } 3768 3769 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3770 { 3771 struct net *net = seq_file_net(f); 3772 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3773 3774 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3775 } 3776 3777 static void pfkey_seq_stop(struct seq_file *f, void *v) 3778 __releases(rcu) 3779 { 3780 rcu_read_unlock(); 3781 } 3782 3783 static const struct seq_operations pfkey_seq_ops = { 3784 .start = pfkey_seq_start, 3785 .next = pfkey_seq_next, 3786 .stop = pfkey_seq_stop, 3787 .show = pfkey_seq_show, 3788 }; 3789 3790 static int pfkey_seq_open(struct inode *inode, struct file *file) 3791 { 3792 return seq_open_net(inode, file, &pfkey_seq_ops, 3793 sizeof(struct seq_net_private)); 3794 } 3795 3796 static const struct file_operations pfkey_proc_ops = { 3797 .open = pfkey_seq_open, 3798 .read = seq_read, 3799 .llseek = seq_lseek, 3800 .release = seq_release_net, 3801 }; 3802 3803 static int __net_init pfkey_init_proc(struct net *net) 3804 { 3805 struct proc_dir_entry *e; 3806 3807 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3808 if (e == NULL) 3809 return -ENOMEM; 3810 3811 return 0; 3812 } 3813 3814 static void __net_exit pfkey_exit_proc(struct net *net) 3815 { 3816 remove_proc_entry("pfkey", net->proc_net); 3817 } 3818 #else 3819 static inline int pfkey_init_proc(struct net *net) 3820 { 3821 return 0; 3822 } 3823 3824 static inline void pfkey_exit_proc(struct net *net) 3825 { 3826 } 3827 #endif 3828 3829 static struct xfrm_mgr pfkeyv2_mgr = 3830 { 3831 .notify = pfkey_send_notify, 3832 .acquire = pfkey_send_acquire, 3833 .compile_policy = pfkey_compile_policy, 3834 .new_mapping = pfkey_send_new_mapping, 3835 .notify_policy = pfkey_send_policy_notify, 3836 .migrate = pfkey_send_migrate, 3837 .is_alive = pfkey_is_alive, 3838 }; 3839 3840 static int __net_init pfkey_net_init(struct net *net) 3841 { 3842 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3843 int rv; 3844 3845 INIT_HLIST_HEAD(&net_pfkey->table); 3846 atomic_set(&net_pfkey->socks_nr, 0); 3847 3848 rv = pfkey_init_proc(net); 3849 3850 return rv; 3851 } 3852 3853 static void __net_exit pfkey_net_exit(struct net *net) 3854 { 3855 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3856 3857 pfkey_exit_proc(net); 3858 WARN_ON(!hlist_empty(&net_pfkey->table)); 3859 } 3860 3861 static struct pernet_operations pfkey_net_ops = { 3862 .init = pfkey_net_init, 3863 .exit = pfkey_net_exit, 3864 .id = &pfkey_net_id, 3865 .size = sizeof(struct netns_pfkey), 3866 }; 3867 3868 static void __exit ipsec_pfkey_exit(void) 3869 { 3870 xfrm_unregister_km(&pfkeyv2_mgr); 3871 sock_unregister(PF_KEY); 3872 unregister_pernet_subsys(&pfkey_net_ops); 3873 proto_unregister(&key_proto); 3874 } 3875 3876 static int __init ipsec_pfkey_init(void) 3877 { 3878 int err = proto_register(&key_proto, 0); 3879 3880 if (err != 0) 3881 goto out; 3882 3883 err = register_pernet_subsys(&pfkey_net_ops); 3884 if (err != 0) 3885 goto out_unregister_key_proto; 3886 err = sock_register(&pfkey_family_ops); 3887 if (err != 0) 3888 goto out_unregister_pernet; 3889 err = xfrm_register_km(&pfkeyv2_mgr); 3890 if (err != 0) 3891 goto out_sock_unregister; 3892 out: 3893 return err; 3894 3895 out_sock_unregister: 3896 sock_unregister(PF_KEY); 3897 out_unregister_pernet: 3898 unregister_pernet_subsys(&pfkey_net_ops); 3899 out_unregister_key_proto: 3900 proto_unregister(&key_proto); 3901 goto out; 3902 } 3903 3904 module_init(ipsec_pfkey_init); 3905 module_exit(ipsec_pfkey_exit); 3906 MODULE_LICENSE("GPL"); 3907 MODULE_ALIAS_NETPROTO(PF_KEY); 3908