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(atomic_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 (atomic_read(&skb->users) != 1) { 207 *skb2 = skb_clone(skb, allocation); 208 } else { 209 *skb2 = skb; 210 atomic_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, 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, GFP_KERNEL, 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, 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 = (struct sadb_msg *) 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, 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 switch (addr->sa_family) { 405 case AF_INET: 406 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 407 if (sp->sadb_address_len != len || 408 sp->sadb_address_prefixlen > 32) 409 return -EINVAL; 410 break; 411 #if IS_ENABLED(CONFIG_IPV6) 412 case AF_INET6: 413 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 414 if (sp->sadb_address_len != len || 415 sp->sadb_address_prefixlen > 128) 416 return -EINVAL; 417 break; 418 #endif 419 default: 420 /* It is user using kernel to keep track of security 421 * associations for another protocol, such as 422 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 423 * lengths. 424 * 425 * XXX Actually, association/policy database is not yet 426 * XXX able to cope with arbitrary sockaddr families. 427 * XXX When it can, remove this -EINVAL. -DaveM 428 */ 429 return -EINVAL; 430 } 431 432 return 0; 433 } 434 435 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 436 { 437 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 438 sec_ctx->sadb_x_ctx_len, 439 sizeof(uint64_t)); 440 } 441 442 static inline int verify_sec_ctx_len(const void *p) 443 { 444 const struct sadb_x_sec_ctx *sec_ctx = p; 445 int len = sec_ctx->sadb_x_ctx_len; 446 447 if (len > PAGE_SIZE) 448 return -EINVAL; 449 450 len = pfkey_sec_ctx_len(sec_ctx); 451 452 if (sec_ctx->sadb_x_sec_len != len) 453 return -EINVAL; 454 455 return 0; 456 } 457 458 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 459 gfp_t gfp) 460 { 461 struct xfrm_user_sec_ctx *uctx = NULL; 462 int ctx_size = sec_ctx->sadb_x_ctx_len; 463 464 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 465 466 if (!uctx) 467 return NULL; 468 469 uctx->len = pfkey_sec_ctx_len(sec_ctx); 470 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 471 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 472 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 473 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 474 memcpy(uctx + 1, sec_ctx + 1, 475 uctx->ctx_len); 476 477 return uctx; 478 } 479 480 static int present_and_same_family(const struct sadb_address *src, 481 const struct sadb_address *dst) 482 { 483 const struct sockaddr *s_addr, *d_addr; 484 485 if (!src || !dst) 486 return 0; 487 488 s_addr = (const struct sockaddr *)(src + 1); 489 d_addr = (const struct sockaddr *)(dst + 1); 490 if (s_addr->sa_family != d_addr->sa_family) 491 return 0; 492 if (s_addr->sa_family != AF_INET 493 #if IS_ENABLED(CONFIG_IPV6) 494 && s_addr->sa_family != AF_INET6 495 #endif 496 ) 497 return 0; 498 499 return 1; 500 } 501 502 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 503 { 504 const char *p = (char *) hdr; 505 int len = skb->len; 506 507 len -= sizeof(*hdr); 508 p += sizeof(*hdr); 509 while (len > 0) { 510 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 511 uint16_t ext_type; 512 int ext_len; 513 514 ext_len = ehdr->sadb_ext_len; 515 ext_len *= sizeof(uint64_t); 516 ext_type = ehdr->sadb_ext_type; 517 if (ext_len < sizeof(uint64_t) || 518 ext_len > len || 519 ext_type == SADB_EXT_RESERVED) 520 return -EINVAL; 521 522 if (ext_type <= SADB_EXT_MAX) { 523 int min = (int) sadb_ext_min_len[ext_type]; 524 if (ext_len < min) 525 return -EINVAL; 526 if (ext_hdrs[ext_type-1] != NULL) 527 return -EINVAL; 528 if (ext_type == SADB_EXT_ADDRESS_SRC || 529 ext_type == SADB_EXT_ADDRESS_DST || 530 ext_type == SADB_EXT_ADDRESS_PROXY || 531 ext_type == SADB_X_EXT_NAT_T_OA) { 532 if (verify_address_len(p)) 533 return -EINVAL; 534 } 535 if (ext_type == SADB_X_EXT_SEC_CTX) { 536 if (verify_sec_ctx_len(p)) 537 return -EINVAL; 538 } 539 ext_hdrs[ext_type-1] = (void *) p; 540 } 541 p += ext_len; 542 len -= ext_len; 543 } 544 545 return 0; 546 } 547 548 static uint16_t 549 pfkey_satype2proto(uint8_t satype) 550 { 551 switch (satype) { 552 case SADB_SATYPE_UNSPEC: 553 return IPSEC_PROTO_ANY; 554 case SADB_SATYPE_AH: 555 return IPPROTO_AH; 556 case SADB_SATYPE_ESP: 557 return IPPROTO_ESP; 558 case SADB_X_SATYPE_IPCOMP: 559 return IPPROTO_COMP; 560 default: 561 return 0; 562 } 563 /* NOTREACHED */ 564 } 565 566 static uint8_t 567 pfkey_proto2satype(uint16_t proto) 568 { 569 switch (proto) { 570 case IPPROTO_AH: 571 return SADB_SATYPE_AH; 572 case IPPROTO_ESP: 573 return SADB_SATYPE_ESP; 574 case IPPROTO_COMP: 575 return SADB_X_SATYPE_IPCOMP; 576 default: 577 return 0; 578 } 579 /* NOTREACHED */ 580 } 581 582 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 583 * say specifically 'just raw sockets' as we encode them as 255. 584 */ 585 586 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 587 { 588 return proto == IPSEC_PROTO_ANY ? 0 : proto; 589 } 590 591 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 592 { 593 return proto ? proto : IPSEC_PROTO_ANY; 594 } 595 596 static inline int pfkey_sockaddr_len(sa_family_t family) 597 { 598 switch (family) { 599 case AF_INET: 600 return sizeof(struct sockaddr_in); 601 #if IS_ENABLED(CONFIG_IPV6) 602 case AF_INET6: 603 return sizeof(struct sockaddr_in6); 604 #endif 605 } 606 return 0; 607 } 608 609 static 610 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 611 { 612 switch (sa->sa_family) { 613 case AF_INET: 614 xaddr->a4 = 615 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 616 return AF_INET; 617 #if IS_ENABLED(CONFIG_IPV6) 618 case AF_INET6: 619 memcpy(xaddr->a6, 620 &((struct sockaddr_in6 *)sa)->sin6_addr, 621 sizeof(struct in6_addr)); 622 return AF_INET6; 623 #endif 624 } 625 return 0; 626 } 627 628 static 629 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 630 { 631 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 632 xaddr); 633 } 634 635 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 636 { 637 const struct sadb_sa *sa; 638 const struct sadb_address *addr; 639 uint16_t proto; 640 unsigned short family; 641 xfrm_address_t *xaddr; 642 643 sa = ext_hdrs[SADB_EXT_SA - 1]; 644 if (sa == NULL) 645 return NULL; 646 647 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 648 if (proto == 0) 649 return NULL; 650 651 /* sadb_address_len should be checked by caller */ 652 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 653 if (addr == NULL) 654 return NULL; 655 656 family = ((const struct sockaddr *)(addr + 1))->sa_family; 657 switch (family) { 658 case AF_INET: 659 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 660 break; 661 #if IS_ENABLED(CONFIG_IPV6) 662 case AF_INET6: 663 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 664 break; 665 #endif 666 default: 667 xaddr = NULL; 668 } 669 670 if (!xaddr) 671 return NULL; 672 673 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 674 } 675 676 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 677 678 static int 679 pfkey_sockaddr_size(sa_family_t family) 680 { 681 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 682 } 683 684 static inline int pfkey_mode_from_xfrm(int mode) 685 { 686 switch(mode) { 687 case XFRM_MODE_TRANSPORT: 688 return IPSEC_MODE_TRANSPORT; 689 case XFRM_MODE_TUNNEL: 690 return IPSEC_MODE_TUNNEL; 691 case XFRM_MODE_BEET: 692 return IPSEC_MODE_BEET; 693 default: 694 return -1; 695 } 696 } 697 698 static inline int pfkey_mode_to_xfrm(int mode) 699 { 700 switch(mode) { 701 case IPSEC_MODE_ANY: /*XXX*/ 702 case IPSEC_MODE_TRANSPORT: 703 return XFRM_MODE_TRANSPORT; 704 case IPSEC_MODE_TUNNEL: 705 return XFRM_MODE_TUNNEL; 706 case IPSEC_MODE_BEET: 707 return XFRM_MODE_BEET; 708 default: 709 return -1; 710 } 711 } 712 713 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 714 struct sockaddr *sa, 715 unsigned short family) 716 { 717 switch (family) { 718 case AF_INET: 719 { 720 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 721 sin->sin_family = AF_INET; 722 sin->sin_port = port; 723 sin->sin_addr.s_addr = xaddr->a4; 724 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 725 return 32; 726 } 727 #if IS_ENABLED(CONFIG_IPV6) 728 case AF_INET6: 729 { 730 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 731 sin6->sin6_family = AF_INET6; 732 sin6->sin6_port = port; 733 sin6->sin6_flowinfo = 0; 734 sin6->sin6_addr = xaddr->in6; 735 sin6->sin6_scope_id = 0; 736 return 128; 737 } 738 #endif 739 } 740 return 0; 741 } 742 743 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 744 int add_keys, int hsc) 745 { 746 struct sk_buff *skb; 747 struct sadb_msg *hdr; 748 struct sadb_sa *sa; 749 struct sadb_lifetime *lifetime; 750 struct sadb_address *addr; 751 struct sadb_key *key; 752 struct sadb_x_sa2 *sa2; 753 struct sadb_x_sec_ctx *sec_ctx; 754 struct xfrm_sec_ctx *xfrm_ctx; 755 int ctx_size = 0; 756 int size; 757 int auth_key_size = 0; 758 int encrypt_key_size = 0; 759 int sockaddr_size; 760 struct xfrm_encap_tmpl *natt = NULL; 761 int mode; 762 763 /* address family check */ 764 sockaddr_size = pfkey_sockaddr_size(x->props.family); 765 if (!sockaddr_size) 766 return ERR_PTR(-EINVAL); 767 768 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 769 key(AE), (identity(SD),) (sensitivity)> */ 770 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 771 sizeof(struct sadb_lifetime) + 772 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 773 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 774 sizeof(struct sadb_address)*2 + 775 sockaddr_size*2 + 776 sizeof(struct sadb_x_sa2); 777 778 if ((xfrm_ctx = x->security)) { 779 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 780 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 781 } 782 783 /* identity & sensitivity */ 784 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 785 size += sizeof(struct sadb_address) + sockaddr_size; 786 787 if (add_keys) { 788 if (x->aalg && x->aalg->alg_key_len) { 789 auth_key_size = 790 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 791 size += sizeof(struct sadb_key) + auth_key_size; 792 } 793 if (x->ealg && x->ealg->alg_key_len) { 794 encrypt_key_size = 795 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 796 size += sizeof(struct sadb_key) + encrypt_key_size; 797 } 798 } 799 if (x->encap) 800 natt = x->encap; 801 802 if (natt && natt->encap_type) { 803 size += sizeof(struct sadb_x_nat_t_type); 804 size += sizeof(struct sadb_x_nat_t_port); 805 size += sizeof(struct sadb_x_nat_t_port); 806 } 807 808 skb = alloc_skb(size + 16, GFP_ATOMIC); 809 if (skb == NULL) 810 return ERR_PTR(-ENOBUFS); 811 812 /* call should fill header later */ 813 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 814 memset(hdr, 0, size); /* XXX do we need this ? */ 815 hdr->sadb_msg_len = size / sizeof(uint64_t); 816 817 /* sa */ 818 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 819 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 820 sa->sadb_sa_exttype = SADB_EXT_SA; 821 sa->sadb_sa_spi = x->id.spi; 822 sa->sadb_sa_replay = x->props.replay_window; 823 switch (x->km.state) { 824 case XFRM_STATE_VALID: 825 sa->sadb_sa_state = x->km.dying ? 826 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 827 break; 828 case XFRM_STATE_ACQ: 829 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 830 break; 831 default: 832 sa->sadb_sa_state = SADB_SASTATE_DEAD; 833 break; 834 } 835 sa->sadb_sa_auth = 0; 836 if (x->aalg) { 837 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 838 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 839 a->desc.sadb_alg_id : 0; 840 } 841 sa->sadb_sa_encrypt = 0; 842 BUG_ON(x->ealg && x->calg); 843 if (x->ealg) { 844 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 845 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 846 a->desc.sadb_alg_id : 0; 847 } 848 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 849 if (x->calg) { 850 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 851 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 852 a->desc.sadb_alg_id : 0; 853 } 854 855 sa->sadb_sa_flags = 0; 856 if (x->props.flags & XFRM_STATE_NOECN) 857 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 858 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 859 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 860 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 861 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 862 863 /* hard time */ 864 if (hsc & 2) { 865 lifetime = (struct sadb_lifetime *) skb_put(skb, 866 sizeof(struct sadb_lifetime)); 867 lifetime->sadb_lifetime_len = 868 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 869 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 870 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 871 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 872 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 873 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 874 } 875 /* soft time */ 876 if (hsc & 1) { 877 lifetime = (struct sadb_lifetime *) skb_put(skb, 878 sizeof(struct sadb_lifetime)); 879 lifetime->sadb_lifetime_len = 880 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 881 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 882 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 883 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 884 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 885 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 886 } 887 /* current time */ 888 lifetime = (struct sadb_lifetime *) skb_put(skb, 889 sizeof(struct sadb_lifetime)); 890 lifetime->sadb_lifetime_len = 891 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 892 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 893 lifetime->sadb_lifetime_allocations = x->curlft.packets; 894 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 895 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 896 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 897 /* src address */ 898 addr = (struct sadb_address*) skb_put(skb, 899 sizeof(struct sadb_address)+sockaddr_size); 900 addr->sadb_address_len = 901 (sizeof(struct sadb_address)+sockaddr_size)/ 902 sizeof(uint64_t); 903 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 904 /* "if the ports are non-zero, then the sadb_address_proto field, 905 normally zero, MUST be filled in with the transport 906 protocol's number." - RFC2367 */ 907 addr->sadb_address_proto = 0; 908 addr->sadb_address_reserved = 0; 909 910 addr->sadb_address_prefixlen = 911 pfkey_sockaddr_fill(&x->props.saddr, 0, 912 (struct sockaddr *) (addr + 1), 913 x->props.family); 914 if (!addr->sadb_address_prefixlen) 915 BUG(); 916 917 /* dst address */ 918 addr = (struct sadb_address*) skb_put(skb, 919 sizeof(struct sadb_address)+sockaddr_size); 920 addr->sadb_address_len = 921 (sizeof(struct sadb_address)+sockaddr_size)/ 922 sizeof(uint64_t); 923 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 924 addr->sadb_address_proto = 0; 925 addr->sadb_address_reserved = 0; 926 927 addr->sadb_address_prefixlen = 928 pfkey_sockaddr_fill(&x->id.daddr, 0, 929 (struct sockaddr *) (addr + 1), 930 x->props.family); 931 if (!addr->sadb_address_prefixlen) 932 BUG(); 933 934 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 935 x->props.family)) { 936 addr = (struct sadb_address*) skb_put(skb, 937 sizeof(struct sadb_address)+sockaddr_size); 938 addr->sadb_address_len = 939 (sizeof(struct sadb_address)+sockaddr_size)/ 940 sizeof(uint64_t); 941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 942 addr->sadb_address_proto = 943 pfkey_proto_from_xfrm(x->sel.proto); 944 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 945 addr->sadb_address_reserved = 0; 946 947 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 948 (struct sockaddr *) (addr + 1), 949 x->props.family); 950 } 951 952 /* auth key */ 953 if (add_keys && auth_key_size) { 954 key = (struct sadb_key *) skb_put(skb, 955 sizeof(struct sadb_key)+auth_key_size); 956 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 957 sizeof(uint64_t); 958 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 959 key->sadb_key_bits = x->aalg->alg_key_len; 960 key->sadb_key_reserved = 0; 961 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 962 } 963 /* encrypt key */ 964 if (add_keys && encrypt_key_size) { 965 key = (struct sadb_key *) skb_put(skb, 966 sizeof(struct sadb_key)+encrypt_key_size); 967 key->sadb_key_len = (sizeof(struct sadb_key) + 968 encrypt_key_size) / sizeof(uint64_t); 969 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 970 key->sadb_key_bits = x->ealg->alg_key_len; 971 key->sadb_key_reserved = 0; 972 memcpy(key + 1, x->ealg->alg_key, 973 (x->ealg->alg_key_len+7)/8); 974 } 975 976 /* sa */ 977 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 978 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 979 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 980 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 981 kfree_skb(skb); 982 return ERR_PTR(-EINVAL); 983 } 984 sa2->sadb_x_sa2_mode = mode; 985 sa2->sadb_x_sa2_reserved1 = 0; 986 sa2->sadb_x_sa2_reserved2 = 0; 987 sa2->sadb_x_sa2_sequence = 0; 988 sa2->sadb_x_sa2_reqid = x->props.reqid; 989 990 if (natt && natt->encap_type) { 991 struct sadb_x_nat_t_type *n_type; 992 struct sadb_x_nat_t_port *n_port; 993 994 /* type */ 995 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 996 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 997 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 998 n_type->sadb_x_nat_t_type_type = natt->encap_type; 999 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1000 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1001 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1002 1003 /* source port */ 1004 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1005 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1006 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1007 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1008 n_port->sadb_x_nat_t_port_reserved = 0; 1009 1010 /* dest port */ 1011 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1012 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1013 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1014 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1015 n_port->sadb_x_nat_t_port_reserved = 0; 1016 } 1017 1018 /* security context */ 1019 if (xfrm_ctx) { 1020 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 1021 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1022 sec_ctx->sadb_x_sec_len = 1023 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1024 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1025 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1026 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1027 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1028 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1029 xfrm_ctx->ctx_len); 1030 } 1031 1032 return skb; 1033 } 1034 1035 1036 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1037 { 1038 struct sk_buff *skb; 1039 1040 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1041 1042 return skb; 1043 } 1044 1045 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1046 int hsc) 1047 { 1048 return __pfkey_xfrm_state2msg(x, 0, hsc); 1049 } 1050 1051 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1052 const struct sadb_msg *hdr, 1053 void * const *ext_hdrs) 1054 { 1055 struct xfrm_state *x; 1056 const struct sadb_lifetime *lifetime; 1057 const struct sadb_sa *sa; 1058 const struct sadb_key *key; 1059 const struct sadb_x_sec_ctx *sec_ctx; 1060 uint16_t proto; 1061 int err; 1062 1063 1064 sa = ext_hdrs[SADB_EXT_SA - 1]; 1065 if (!sa || 1066 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1067 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1068 return ERR_PTR(-EINVAL); 1069 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1070 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1071 return ERR_PTR(-EINVAL); 1072 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1073 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1074 return ERR_PTR(-EINVAL); 1075 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1076 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1077 return ERR_PTR(-EINVAL); 1078 1079 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1080 if (proto == 0) 1081 return ERR_PTR(-EINVAL); 1082 1083 /* default error is no buffer space */ 1084 err = -ENOBUFS; 1085 1086 /* RFC2367: 1087 1088 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1089 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1090 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1091 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1092 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1093 not true. 1094 1095 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1096 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1097 */ 1098 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1099 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1100 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1101 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1102 return ERR_PTR(-EINVAL); 1103 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1104 if (key != NULL && 1105 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1106 ((key->sadb_key_bits+7) / 8 == 0 || 1107 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1108 return ERR_PTR(-EINVAL); 1109 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1110 if (key != NULL && 1111 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1112 ((key->sadb_key_bits+7) / 8 == 0 || 1113 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1114 return ERR_PTR(-EINVAL); 1115 1116 x = xfrm_state_alloc(net); 1117 if (x == NULL) 1118 return ERR_PTR(-ENOBUFS); 1119 1120 x->id.proto = proto; 1121 x->id.spi = sa->sadb_sa_spi; 1122 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1123 (sizeof(x->replay.bitmap) * 8)); 1124 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1125 x->props.flags |= XFRM_STATE_NOECN; 1126 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1127 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1128 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1129 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1130 1131 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1132 if (lifetime != NULL) { 1133 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1134 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1135 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1136 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1137 } 1138 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1139 if (lifetime != NULL) { 1140 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1141 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1142 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1143 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1144 } 1145 1146 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1147 if (sec_ctx != NULL) { 1148 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1149 1150 if (!uctx) 1151 goto out; 1152 1153 err = security_xfrm_state_alloc(x, uctx); 1154 kfree(uctx); 1155 1156 if (err) 1157 goto out; 1158 } 1159 1160 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1161 if (sa->sadb_sa_auth) { 1162 int keysize = 0; 1163 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1164 if (!a || !a->pfkey_supported) { 1165 err = -ENOSYS; 1166 goto out; 1167 } 1168 if (key) 1169 keysize = (key->sadb_key_bits + 7) / 8; 1170 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1171 if (!x->aalg) 1172 goto out; 1173 strcpy(x->aalg->alg_name, a->name); 1174 x->aalg->alg_key_len = 0; 1175 if (key) { 1176 x->aalg->alg_key_len = key->sadb_key_bits; 1177 memcpy(x->aalg->alg_key, key+1, keysize); 1178 } 1179 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1180 x->props.aalgo = sa->sadb_sa_auth; 1181 /* x->algo.flags = sa->sadb_sa_flags; */ 1182 } 1183 if (sa->sadb_sa_encrypt) { 1184 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1185 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1186 if (!a || !a->pfkey_supported) { 1187 err = -ENOSYS; 1188 goto out; 1189 } 1190 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1191 if (!x->calg) 1192 goto out; 1193 strcpy(x->calg->alg_name, a->name); 1194 x->props.calgo = sa->sadb_sa_encrypt; 1195 } else { 1196 int keysize = 0; 1197 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1198 if (!a || !a->pfkey_supported) { 1199 err = -ENOSYS; 1200 goto out; 1201 } 1202 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1203 if (key) 1204 keysize = (key->sadb_key_bits + 7) / 8; 1205 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1206 if (!x->ealg) 1207 goto out; 1208 strcpy(x->ealg->alg_name, a->name); 1209 x->ealg->alg_key_len = 0; 1210 if (key) { 1211 x->ealg->alg_key_len = key->sadb_key_bits; 1212 memcpy(x->ealg->alg_key, key+1, keysize); 1213 } 1214 x->props.ealgo = sa->sadb_sa_encrypt; 1215 x->geniv = a->uinfo.encr.geniv; 1216 } 1217 } 1218 /* x->algo.flags = sa->sadb_sa_flags; */ 1219 1220 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1221 &x->props.saddr); 1222 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1223 &x->id.daddr); 1224 1225 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1226 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1227 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1228 if (mode < 0) { 1229 err = -EINVAL; 1230 goto out; 1231 } 1232 x->props.mode = mode; 1233 x->props.reqid = sa2->sadb_x_sa2_reqid; 1234 } 1235 1236 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1237 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1238 1239 /* Nobody uses this, but we try. */ 1240 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1241 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1242 } 1243 1244 if (!x->sel.family) 1245 x->sel.family = x->props.family; 1246 1247 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1248 const struct sadb_x_nat_t_type* n_type; 1249 struct xfrm_encap_tmpl *natt; 1250 1251 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1252 if (!x->encap) 1253 goto out; 1254 1255 natt = x->encap; 1256 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1257 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1258 1259 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1260 const struct sadb_x_nat_t_port *n_port = 1261 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1262 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1263 } 1264 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1265 const struct sadb_x_nat_t_port *n_port = 1266 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1267 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1268 } 1269 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1270 } 1271 1272 err = xfrm_init_state(x); 1273 if (err) 1274 goto out; 1275 1276 x->km.seq = hdr->sadb_msg_seq; 1277 return x; 1278 1279 out: 1280 x->km.state = XFRM_STATE_DEAD; 1281 xfrm_state_put(x); 1282 return ERR_PTR(err); 1283 } 1284 1285 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1286 { 1287 return -EOPNOTSUPP; 1288 } 1289 1290 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1291 { 1292 struct net *net = sock_net(sk); 1293 struct sk_buff *resp_skb; 1294 struct sadb_x_sa2 *sa2; 1295 struct sadb_address *saddr, *daddr; 1296 struct sadb_msg *out_hdr; 1297 struct sadb_spirange *range; 1298 struct xfrm_state *x = NULL; 1299 int mode; 1300 int err; 1301 u32 min_spi, max_spi; 1302 u32 reqid; 1303 u8 proto; 1304 unsigned short family; 1305 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1306 1307 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1308 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1309 return -EINVAL; 1310 1311 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1312 if (proto == 0) 1313 return -EINVAL; 1314 1315 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1316 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1317 if (mode < 0) 1318 return -EINVAL; 1319 reqid = sa2->sadb_x_sa2_reqid; 1320 } else { 1321 mode = 0; 1322 reqid = 0; 1323 } 1324 1325 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1326 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1327 1328 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1329 switch (family) { 1330 case AF_INET: 1331 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1332 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1333 break; 1334 #if IS_ENABLED(CONFIG_IPV6) 1335 case AF_INET6: 1336 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1337 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1338 break; 1339 #endif 1340 } 1341 1342 if (hdr->sadb_msg_seq) { 1343 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1344 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1345 xfrm_state_put(x); 1346 x = NULL; 1347 } 1348 } 1349 1350 if (!x) 1351 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1352 1353 if (x == NULL) 1354 return -ENOENT; 1355 1356 min_spi = 0x100; 1357 max_spi = 0x0fffffff; 1358 1359 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1360 if (range) { 1361 min_spi = range->sadb_spirange_min; 1362 max_spi = range->sadb_spirange_max; 1363 } 1364 1365 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1366 if (err) { 1367 xfrm_state_put(x); 1368 return err; 1369 } 1370 1371 err = xfrm_alloc_spi(x, min_spi, max_spi); 1372 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1373 1374 if (IS_ERR(resp_skb)) { 1375 xfrm_state_put(x); 1376 return PTR_ERR(resp_skb); 1377 } 1378 1379 out_hdr = (struct sadb_msg *) resp_skb->data; 1380 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1381 out_hdr->sadb_msg_type = SADB_GETSPI; 1382 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1383 out_hdr->sadb_msg_errno = 0; 1384 out_hdr->sadb_msg_reserved = 0; 1385 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1386 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1387 1388 xfrm_state_put(x); 1389 1390 pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net); 1391 1392 return 0; 1393 } 1394 1395 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1396 { 1397 struct net *net = sock_net(sk); 1398 struct xfrm_state *x; 1399 1400 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1401 return -EOPNOTSUPP; 1402 1403 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1404 return 0; 1405 1406 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1407 if (x == NULL) 1408 return 0; 1409 1410 spin_lock_bh(&x->lock); 1411 if (x->km.state == XFRM_STATE_ACQ) 1412 x->km.state = XFRM_STATE_ERROR; 1413 1414 spin_unlock_bh(&x->lock); 1415 xfrm_state_put(x); 1416 return 0; 1417 } 1418 1419 static inline int event2poltype(int event) 1420 { 1421 switch (event) { 1422 case XFRM_MSG_DELPOLICY: 1423 return SADB_X_SPDDELETE; 1424 case XFRM_MSG_NEWPOLICY: 1425 return SADB_X_SPDADD; 1426 case XFRM_MSG_UPDPOLICY: 1427 return SADB_X_SPDUPDATE; 1428 case XFRM_MSG_POLEXPIRE: 1429 // return SADB_X_SPDEXPIRE; 1430 default: 1431 pr_err("pfkey: Unknown policy event %d\n", event); 1432 break; 1433 } 1434 1435 return 0; 1436 } 1437 1438 static inline int event2keytype(int event) 1439 { 1440 switch (event) { 1441 case XFRM_MSG_DELSA: 1442 return SADB_DELETE; 1443 case XFRM_MSG_NEWSA: 1444 return SADB_ADD; 1445 case XFRM_MSG_UPDSA: 1446 return SADB_UPDATE; 1447 case XFRM_MSG_EXPIRE: 1448 return SADB_EXPIRE; 1449 default: 1450 pr_err("pfkey: Unknown SA event %d\n", event); 1451 break; 1452 } 1453 1454 return 0; 1455 } 1456 1457 /* ADD/UPD/DEL */ 1458 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1459 { 1460 struct sk_buff *skb; 1461 struct sadb_msg *hdr; 1462 1463 skb = pfkey_xfrm_state2msg(x); 1464 1465 if (IS_ERR(skb)) 1466 return PTR_ERR(skb); 1467 1468 hdr = (struct sadb_msg *) skb->data; 1469 hdr->sadb_msg_version = PF_KEY_V2; 1470 hdr->sadb_msg_type = event2keytype(c->event); 1471 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1472 hdr->sadb_msg_errno = 0; 1473 hdr->sadb_msg_reserved = 0; 1474 hdr->sadb_msg_seq = c->seq; 1475 hdr->sadb_msg_pid = c->portid; 1476 1477 pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x)); 1478 1479 return 0; 1480 } 1481 1482 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1483 { 1484 struct net *net = sock_net(sk); 1485 struct xfrm_state *x; 1486 int err; 1487 struct km_event c; 1488 1489 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1490 if (IS_ERR(x)) 1491 return PTR_ERR(x); 1492 1493 xfrm_state_hold(x); 1494 if (hdr->sadb_msg_type == SADB_ADD) 1495 err = xfrm_state_add(x); 1496 else 1497 err = xfrm_state_update(x); 1498 1499 xfrm_audit_state_add(x, err ? 0 : 1, true); 1500 1501 if (err < 0) { 1502 x->km.state = XFRM_STATE_DEAD; 1503 __xfrm_state_put(x); 1504 goto out; 1505 } 1506 1507 if (hdr->sadb_msg_type == SADB_ADD) 1508 c.event = XFRM_MSG_NEWSA; 1509 else 1510 c.event = XFRM_MSG_UPDSA; 1511 c.seq = hdr->sadb_msg_seq; 1512 c.portid = hdr->sadb_msg_pid; 1513 km_state_notify(x, &c); 1514 out: 1515 xfrm_state_put(x); 1516 return err; 1517 } 1518 1519 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1520 { 1521 struct net *net = sock_net(sk); 1522 struct xfrm_state *x; 1523 struct km_event c; 1524 int err; 1525 1526 if (!ext_hdrs[SADB_EXT_SA-1] || 1527 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1528 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1529 return -EINVAL; 1530 1531 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1532 if (x == NULL) 1533 return -ESRCH; 1534 1535 if ((err = security_xfrm_state_delete(x))) 1536 goto out; 1537 1538 if (xfrm_state_kern(x)) { 1539 err = -EPERM; 1540 goto out; 1541 } 1542 1543 err = xfrm_state_delete(x); 1544 1545 if (err < 0) 1546 goto out; 1547 1548 c.seq = hdr->sadb_msg_seq; 1549 c.portid = hdr->sadb_msg_pid; 1550 c.event = XFRM_MSG_DELSA; 1551 km_state_notify(x, &c); 1552 out: 1553 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1554 xfrm_state_put(x); 1555 1556 return err; 1557 } 1558 1559 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1560 { 1561 struct net *net = sock_net(sk); 1562 __u8 proto; 1563 struct sk_buff *out_skb; 1564 struct sadb_msg *out_hdr; 1565 struct xfrm_state *x; 1566 1567 if (!ext_hdrs[SADB_EXT_SA-1] || 1568 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1569 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1570 return -EINVAL; 1571 1572 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1573 if (x == NULL) 1574 return -ESRCH; 1575 1576 out_skb = pfkey_xfrm_state2msg(x); 1577 proto = x->id.proto; 1578 xfrm_state_put(x); 1579 if (IS_ERR(out_skb)) 1580 return PTR_ERR(out_skb); 1581 1582 out_hdr = (struct sadb_msg *) out_skb->data; 1583 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1584 out_hdr->sadb_msg_type = SADB_GET; 1585 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1586 out_hdr->sadb_msg_errno = 0; 1587 out_hdr->sadb_msg_reserved = 0; 1588 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1589 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1590 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk)); 1591 1592 return 0; 1593 } 1594 1595 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1596 gfp_t allocation) 1597 { 1598 struct sk_buff *skb; 1599 struct sadb_msg *hdr; 1600 int len, auth_len, enc_len, i; 1601 1602 auth_len = xfrm_count_pfkey_auth_supported(); 1603 if (auth_len) { 1604 auth_len *= sizeof(struct sadb_alg); 1605 auth_len += sizeof(struct sadb_supported); 1606 } 1607 1608 enc_len = xfrm_count_pfkey_enc_supported(); 1609 if (enc_len) { 1610 enc_len *= sizeof(struct sadb_alg); 1611 enc_len += sizeof(struct sadb_supported); 1612 } 1613 1614 len = enc_len + auth_len + sizeof(struct sadb_msg); 1615 1616 skb = alloc_skb(len + 16, allocation); 1617 if (!skb) 1618 goto out_put_algs; 1619 1620 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1621 pfkey_hdr_dup(hdr, orig); 1622 hdr->sadb_msg_errno = 0; 1623 hdr->sadb_msg_len = len / sizeof(uint64_t); 1624 1625 if (auth_len) { 1626 struct sadb_supported *sp; 1627 struct sadb_alg *ap; 1628 1629 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1630 ap = (struct sadb_alg *) (sp + 1); 1631 1632 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1633 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1634 1635 for (i = 0; ; i++) { 1636 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1637 if (!aalg) 1638 break; 1639 if (!aalg->pfkey_supported) 1640 continue; 1641 if (aalg->available) 1642 *ap++ = aalg->desc; 1643 } 1644 } 1645 1646 if (enc_len) { 1647 struct sadb_supported *sp; 1648 struct sadb_alg *ap; 1649 1650 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1651 ap = (struct sadb_alg *) (sp + 1); 1652 1653 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1654 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1655 1656 for (i = 0; ; i++) { 1657 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1658 if (!ealg) 1659 break; 1660 if (!ealg->pfkey_supported) 1661 continue; 1662 if (ealg->available) 1663 *ap++ = ealg->desc; 1664 } 1665 } 1666 1667 out_put_algs: 1668 return skb; 1669 } 1670 1671 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1672 { 1673 struct pfkey_sock *pfk = pfkey_sk(sk); 1674 struct sk_buff *supp_skb; 1675 1676 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1677 return -EINVAL; 1678 1679 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1680 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1681 return -EEXIST; 1682 pfk->registered |= (1<<hdr->sadb_msg_satype); 1683 } 1684 1685 xfrm_probe_algs(); 1686 1687 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1688 if (!supp_skb) { 1689 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1690 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1691 1692 return -ENOBUFS; 1693 } 1694 1695 pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk)); 1696 1697 return 0; 1698 } 1699 1700 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1701 { 1702 struct sk_buff *skb; 1703 struct sadb_msg *hdr; 1704 1705 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1706 if (!skb) 1707 return -ENOBUFS; 1708 1709 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1710 memcpy(hdr, ihdr, sizeof(struct sadb_msg)); 1711 hdr->sadb_msg_errno = (uint8_t) 0; 1712 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1713 1714 return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk)); 1715 } 1716 1717 static int key_notify_sa_flush(const struct km_event *c) 1718 { 1719 struct sk_buff *skb; 1720 struct sadb_msg *hdr; 1721 1722 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1723 if (!skb) 1724 return -ENOBUFS; 1725 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1726 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1727 hdr->sadb_msg_type = SADB_FLUSH; 1728 hdr->sadb_msg_seq = c->seq; 1729 hdr->sadb_msg_pid = c->portid; 1730 hdr->sadb_msg_version = PF_KEY_V2; 1731 hdr->sadb_msg_errno = (uint8_t) 0; 1732 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1733 hdr->sadb_msg_reserved = 0; 1734 1735 pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net); 1736 1737 return 0; 1738 } 1739 1740 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1741 { 1742 struct net *net = sock_net(sk); 1743 unsigned int proto; 1744 struct km_event c; 1745 int err, err2; 1746 1747 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1748 if (proto == 0) 1749 return -EINVAL; 1750 1751 err = xfrm_state_flush(net, proto, true); 1752 err2 = unicast_flush_resp(sk, hdr); 1753 if (err || err2) { 1754 if (err == -ESRCH) /* empty table - go quietly */ 1755 err = 0; 1756 return err ? err : err2; 1757 } 1758 1759 c.data.proto = proto; 1760 c.seq = hdr->sadb_msg_seq; 1761 c.portid = hdr->sadb_msg_pid; 1762 c.event = XFRM_MSG_FLUSHSA; 1763 c.net = net; 1764 km_state_notify(NULL, &c); 1765 1766 return 0; 1767 } 1768 1769 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1770 { 1771 struct pfkey_sock *pfk = ptr; 1772 struct sk_buff *out_skb; 1773 struct sadb_msg *out_hdr; 1774 1775 if (!pfkey_can_dump(&pfk->sk)) 1776 return -ENOBUFS; 1777 1778 out_skb = pfkey_xfrm_state2msg(x); 1779 if (IS_ERR(out_skb)) 1780 return PTR_ERR(out_skb); 1781 1782 out_hdr = (struct sadb_msg *) out_skb->data; 1783 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1784 out_hdr->sadb_msg_type = SADB_DUMP; 1785 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1786 out_hdr->sadb_msg_errno = 0; 1787 out_hdr->sadb_msg_reserved = 0; 1788 out_hdr->sadb_msg_seq = count + 1; 1789 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1790 1791 if (pfk->dump.skb) 1792 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE, 1793 &pfk->sk, sock_net(&pfk->sk)); 1794 pfk->dump.skb = out_skb; 1795 1796 return 0; 1797 } 1798 1799 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1800 { 1801 struct net *net = sock_net(&pfk->sk); 1802 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1803 } 1804 1805 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1806 { 1807 struct net *net = sock_net(&pfk->sk); 1808 1809 xfrm_state_walk_done(&pfk->dump.u.state, net); 1810 } 1811 1812 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1813 { 1814 u8 proto; 1815 struct xfrm_address_filter *filter = NULL; 1816 struct pfkey_sock *pfk = pfkey_sk(sk); 1817 1818 mutex_lock(&pfk->dump_lock); 1819 if (pfk->dump.dump != NULL) { 1820 mutex_unlock(&pfk->dump_lock); 1821 return -EBUSY; 1822 } 1823 1824 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1825 if (proto == 0) { 1826 mutex_unlock(&pfk->dump_lock); 1827 return -EINVAL; 1828 } 1829 1830 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1831 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1832 1833 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1834 if (filter == NULL) { 1835 mutex_unlock(&pfk->dump_lock); 1836 return -ENOMEM; 1837 } 1838 1839 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1840 sizeof(xfrm_address_t)); 1841 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1842 sizeof(xfrm_address_t)); 1843 filter->family = xfilter->sadb_x_filter_family; 1844 filter->splen = xfilter->sadb_x_filter_splen; 1845 filter->dplen = xfilter->sadb_x_filter_dplen; 1846 } 1847 1848 pfk->dump.msg_version = hdr->sadb_msg_version; 1849 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1850 pfk->dump.dump = pfkey_dump_sa; 1851 pfk->dump.done = pfkey_dump_sa_done; 1852 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1853 mutex_unlock(&pfk->dump_lock); 1854 1855 return pfkey_do_dump(pfk); 1856 } 1857 1858 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1859 { 1860 struct pfkey_sock *pfk = pfkey_sk(sk); 1861 int satype = hdr->sadb_msg_satype; 1862 bool reset_errno = false; 1863 1864 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1865 reset_errno = true; 1866 if (satype != 0 && satype != 1) 1867 return -EINVAL; 1868 pfk->promisc = satype; 1869 } 1870 if (reset_errno && skb_cloned(skb)) 1871 skb = skb_copy(skb, GFP_KERNEL); 1872 else 1873 skb = skb_clone(skb, GFP_KERNEL); 1874 1875 if (reset_errno && skb) { 1876 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1877 new_hdr->sadb_msg_errno = 0; 1878 } 1879 1880 pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk)); 1881 return 0; 1882 } 1883 1884 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1885 { 1886 int i; 1887 u32 reqid = *(u32*)ptr; 1888 1889 for (i=0; i<xp->xfrm_nr; i++) { 1890 if (xp->xfrm_vec[i].reqid == reqid) 1891 return -EEXIST; 1892 } 1893 return 0; 1894 } 1895 1896 static u32 gen_reqid(struct net *net) 1897 { 1898 struct xfrm_policy_walk walk; 1899 u32 start; 1900 int rc; 1901 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1902 1903 start = reqid; 1904 do { 1905 ++reqid; 1906 if (reqid == 0) 1907 reqid = IPSEC_MANUAL_REQID_MAX+1; 1908 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1909 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1910 xfrm_policy_walk_done(&walk, net); 1911 if (rc != -EEXIST) 1912 return reqid; 1913 } while (reqid != start); 1914 return 0; 1915 } 1916 1917 static int 1918 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1919 { 1920 struct net *net = xp_net(xp); 1921 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1922 int mode; 1923 1924 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1925 return -ELOOP; 1926 1927 if (rq->sadb_x_ipsecrequest_mode == 0) 1928 return -EINVAL; 1929 1930 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1931 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1932 return -EINVAL; 1933 t->mode = mode; 1934 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1935 t->optional = 1; 1936 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1937 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1938 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1939 t->reqid = 0; 1940 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1941 return -ENOBUFS; 1942 } 1943 1944 /* addresses present only in tunnel mode */ 1945 if (t->mode == XFRM_MODE_TUNNEL) { 1946 int err; 1947 1948 err = parse_sockaddr_pair( 1949 (struct sockaddr *)(rq + 1), 1950 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1951 &t->saddr, &t->id.daddr, &t->encap_family); 1952 if (err) 1953 return err; 1954 } else 1955 t->encap_family = xp->family; 1956 1957 /* No way to set this via kame pfkey */ 1958 t->allalgs = 1; 1959 xp->xfrm_nr++; 1960 return 0; 1961 } 1962 1963 static int 1964 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1965 { 1966 int err; 1967 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1968 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1969 1970 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1971 return -EINVAL; 1972 1973 while (len >= sizeof(*rq)) { 1974 if (len < rq->sadb_x_ipsecrequest_len || 1975 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 1976 return -EINVAL; 1977 1978 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1979 return err; 1980 len -= rq->sadb_x_ipsecrequest_len; 1981 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1982 } 1983 return 0; 1984 } 1985 1986 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1987 { 1988 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1989 1990 if (xfrm_ctx) { 1991 int len = sizeof(struct sadb_x_sec_ctx); 1992 len += xfrm_ctx->ctx_len; 1993 return PFKEY_ALIGN8(len); 1994 } 1995 return 0; 1996 } 1997 1998 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 1999 { 2000 const struct xfrm_tmpl *t; 2001 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2002 int socklen = 0; 2003 int i; 2004 2005 for (i=0; i<xp->xfrm_nr; i++) { 2006 t = xp->xfrm_vec + i; 2007 socklen += pfkey_sockaddr_len(t->encap_family); 2008 } 2009 2010 return sizeof(struct sadb_msg) + 2011 (sizeof(struct sadb_lifetime) * 3) + 2012 (sizeof(struct sadb_address) * 2) + 2013 (sockaddr_size * 2) + 2014 sizeof(struct sadb_x_policy) + 2015 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2016 (socklen * 2) + 2017 pfkey_xfrm_policy2sec_ctx_size(xp); 2018 } 2019 2020 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2021 { 2022 struct sk_buff *skb; 2023 int size; 2024 2025 size = pfkey_xfrm_policy2msg_size(xp); 2026 2027 skb = alloc_skb(size + 16, GFP_ATOMIC); 2028 if (skb == NULL) 2029 return ERR_PTR(-ENOBUFS); 2030 2031 return skb; 2032 } 2033 2034 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2035 { 2036 struct sadb_msg *hdr; 2037 struct sadb_address *addr; 2038 struct sadb_lifetime *lifetime; 2039 struct sadb_x_policy *pol; 2040 struct sadb_x_sec_ctx *sec_ctx; 2041 struct xfrm_sec_ctx *xfrm_ctx; 2042 int i; 2043 int size; 2044 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2045 int socklen = pfkey_sockaddr_len(xp->family); 2046 2047 size = pfkey_xfrm_policy2msg_size(xp); 2048 2049 /* call should fill header later */ 2050 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2051 memset(hdr, 0, size); /* XXX do we need this ? */ 2052 2053 /* src address */ 2054 addr = (struct sadb_address*) skb_put(skb, 2055 sizeof(struct sadb_address)+sockaddr_size); 2056 addr->sadb_address_len = 2057 (sizeof(struct sadb_address)+sockaddr_size)/ 2058 sizeof(uint64_t); 2059 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2060 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2061 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2062 addr->sadb_address_reserved = 0; 2063 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2064 xp->selector.sport, 2065 (struct sockaddr *) (addr + 1), 2066 xp->family)) 2067 BUG(); 2068 2069 /* dst address */ 2070 addr = (struct sadb_address*) skb_put(skb, 2071 sizeof(struct sadb_address)+sockaddr_size); 2072 addr->sadb_address_len = 2073 (sizeof(struct sadb_address)+sockaddr_size)/ 2074 sizeof(uint64_t); 2075 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2076 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2077 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2078 addr->sadb_address_reserved = 0; 2079 2080 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2081 (struct sockaddr *) (addr + 1), 2082 xp->family); 2083 2084 /* hard time */ 2085 lifetime = (struct sadb_lifetime *) skb_put(skb, 2086 sizeof(struct sadb_lifetime)); 2087 lifetime->sadb_lifetime_len = 2088 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2089 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2090 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2091 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2092 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2093 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2094 /* soft time */ 2095 lifetime = (struct sadb_lifetime *) skb_put(skb, 2096 sizeof(struct sadb_lifetime)); 2097 lifetime->sadb_lifetime_len = 2098 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2099 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2100 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2101 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2102 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2103 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2104 /* current time */ 2105 lifetime = (struct sadb_lifetime *) skb_put(skb, 2106 sizeof(struct sadb_lifetime)); 2107 lifetime->sadb_lifetime_len = 2108 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2109 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2110 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2111 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2112 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2113 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2114 2115 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2116 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2117 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2118 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2119 if (xp->action == XFRM_POLICY_ALLOW) { 2120 if (xp->xfrm_nr) 2121 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2122 else 2123 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2124 } 2125 pol->sadb_x_policy_dir = dir+1; 2126 pol->sadb_x_policy_reserved = 0; 2127 pol->sadb_x_policy_id = xp->index; 2128 pol->sadb_x_policy_priority = xp->priority; 2129 2130 for (i=0; i<xp->xfrm_nr; i++) { 2131 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2132 struct sadb_x_ipsecrequest *rq; 2133 int req_size; 2134 int mode; 2135 2136 req_size = sizeof(struct sadb_x_ipsecrequest); 2137 if (t->mode == XFRM_MODE_TUNNEL) { 2138 socklen = pfkey_sockaddr_len(t->encap_family); 2139 req_size += socklen * 2; 2140 } else { 2141 size -= 2*socklen; 2142 } 2143 rq = (void*)skb_put(skb, req_size); 2144 pol->sadb_x_policy_len += req_size/8; 2145 memset(rq, 0, sizeof(*rq)); 2146 rq->sadb_x_ipsecrequest_len = req_size; 2147 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2148 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2149 return -EINVAL; 2150 rq->sadb_x_ipsecrequest_mode = mode; 2151 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2152 if (t->reqid) 2153 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2154 if (t->optional) 2155 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2156 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2157 2158 if (t->mode == XFRM_MODE_TUNNEL) { 2159 u8 *sa = (void *)(rq + 1); 2160 pfkey_sockaddr_fill(&t->saddr, 0, 2161 (struct sockaddr *)sa, 2162 t->encap_family); 2163 pfkey_sockaddr_fill(&t->id.daddr, 0, 2164 (struct sockaddr *) (sa + socklen), 2165 t->encap_family); 2166 } 2167 } 2168 2169 /* security context */ 2170 if ((xfrm_ctx = xp->security)) { 2171 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2172 2173 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2174 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2175 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2176 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2177 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2178 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2179 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2180 xfrm_ctx->ctx_len); 2181 } 2182 2183 hdr->sadb_msg_len = size / sizeof(uint64_t); 2184 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2185 2186 return 0; 2187 } 2188 2189 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2190 { 2191 struct sk_buff *out_skb; 2192 struct sadb_msg *out_hdr; 2193 int err; 2194 2195 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2196 if (IS_ERR(out_skb)) 2197 return PTR_ERR(out_skb); 2198 2199 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2200 if (err < 0) 2201 return err; 2202 2203 out_hdr = (struct sadb_msg *) out_skb->data; 2204 out_hdr->sadb_msg_version = PF_KEY_V2; 2205 2206 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2207 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2208 else 2209 out_hdr->sadb_msg_type = event2poltype(c->event); 2210 out_hdr->sadb_msg_errno = 0; 2211 out_hdr->sadb_msg_seq = c->seq; 2212 out_hdr->sadb_msg_pid = c->portid; 2213 pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp)); 2214 return 0; 2215 2216 } 2217 2218 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2219 { 2220 struct net *net = sock_net(sk); 2221 int err = 0; 2222 struct sadb_lifetime *lifetime; 2223 struct sadb_address *sa; 2224 struct sadb_x_policy *pol; 2225 struct xfrm_policy *xp; 2226 struct km_event c; 2227 struct sadb_x_sec_ctx *sec_ctx; 2228 2229 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2230 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2231 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2232 return -EINVAL; 2233 2234 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2235 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2236 return -EINVAL; 2237 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2238 return -EINVAL; 2239 2240 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2241 if (xp == NULL) 2242 return -ENOBUFS; 2243 2244 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2245 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2246 xp->priority = pol->sadb_x_policy_priority; 2247 2248 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2249 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2250 xp->selector.family = xp->family; 2251 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2252 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2253 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2254 if (xp->selector.sport) 2255 xp->selector.sport_mask = htons(0xffff); 2256 2257 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2258 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2259 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2260 2261 /* Amusing, we set this twice. KAME apps appear to set same value 2262 * in both addresses. 2263 */ 2264 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2265 2266 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2267 if (xp->selector.dport) 2268 xp->selector.dport_mask = htons(0xffff); 2269 2270 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2271 if (sec_ctx != NULL) { 2272 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2273 2274 if (!uctx) { 2275 err = -ENOBUFS; 2276 goto out; 2277 } 2278 2279 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2280 kfree(uctx); 2281 2282 if (err) 2283 goto out; 2284 } 2285 2286 xp->lft.soft_byte_limit = XFRM_INF; 2287 xp->lft.hard_byte_limit = XFRM_INF; 2288 xp->lft.soft_packet_limit = XFRM_INF; 2289 xp->lft.hard_packet_limit = XFRM_INF; 2290 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2291 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2292 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2293 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2294 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2295 } 2296 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2297 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2298 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2299 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2300 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2301 } 2302 xp->xfrm_nr = 0; 2303 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2304 (err = parse_ipsecrequests(xp, pol)) < 0) 2305 goto out; 2306 2307 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2308 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2309 2310 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2311 2312 if (err) 2313 goto out; 2314 2315 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2316 c.event = XFRM_MSG_UPDPOLICY; 2317 else 2318 c.event = XFRM_MSG_NEWPOLICY; 2319 2320 c.seq = hdr->sadb_msg_seq; 2321 c.portid = hdr->sadb_msg_pid; 2322 2323 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2324 xfrm_pol_put(xp); 2325 return 0; 2326 2327 out: 2328 xp->walk.dead = 1; 2329 xfrm_policy_destroy(xp); 2330 return err; 2331 } 2332 2333 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2334 { 2335 struct net *net = sock_net(sk); 2336 int err; 2337 struct sadb_address *sa; 2338 struct sadb_x_policy *pol; 2339 struct xfrm_policy *xp; 2340 struct xfrm_selector sel; 2341 struct km_event c; 2342 struct sadb_x_sec_ctx *sec_ctx; 2343 struct xfrm_sec_ctx *pol_ctx = NULL; 2344 2345 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2346 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2347 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2348 return -EINVAL; 2349 2350 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2351 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2352 return -EINVAL; 2353 2354 memset(&sel, 0, sizeof(sel)); 2355 2356 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2357 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2358 sel.prefixlen_s = sa->sadb_address_prefixlen; 2359 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2360 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2361 if (sel.sport) 2362 sel.sport_mask = htons(0xffff); 2363 2364 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2365 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2366 sel.prefixlen_d = sa->sadb_address_prefixlen; 2367 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2368 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2369 if (sel.dport) 2370 sel.dport_mask = htons(0xffff); 2371 2372 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2373 if (sec_ctx != NULL) { 2374 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2375 2376 if (!uctx) 2377 return -ENOMEM; 2378 2379 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2380 kfree(uctx); 2381 if (err) 2382 return err; 2383 } 2384 2385 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2386 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2387 1, &err); 2388 security_xfrm_policy_free(pol_ctx); 2389 if (xp == NULL) 2390 return -ENOENT; 2391 2392 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2393 2394 if (err) 2395 goto out; 2396 2397 c.seq = hdr->sadb_msg_seq; 2398 c.portid = hdr->sadb_msg_pid; 2399 c.data.byid = 0; 2400 c.event = XFRM_MSG_DELPOLICY; 2401 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2402 2403 out: 2404 xfrm_pol_put(xp); 2405 if (err == 0) 2406 xfrm_garbage_collect(net); 2407 return err; 2408 } 2409 2410 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2411 { 2412 int err; 2413 struct sk_buff *out_skb; 2414 struct sadb_msg *out_hdr; 2415 err = 0; 2416 2417 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2418 if (IS_ERR(out_skb)) { 2419 err = PTR_ERR(out_skb); 2420 goto out; 2421 } 2422 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2423 if (err < 0) 2424 goto out; 2425 2426 out_hdr = (struct sadb_msg *) out_skb->data; 2427 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2428 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2429 out_hdr->sadb_msg_satype = 0; 2430 out_hdr->sadb_msg_errno = 0; 2431 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2432 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2433 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp)); 2434 err = 0; 2435 2436 out: 2437 return err; 2438 } 2439 2440 static int pfkey_sockaddr_pair_size(sa_family_t family) 2441 { 2442 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2443 } 2444 2445 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2446 xfrm_address_t *saddr, xfrm_address_t *daddr, 2447 u16 *family) 2448 { 2449 int af, socklen; 2450 2451 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2452 return -EINVAL; 2453 2454 af = pfkey_sockaddr_extract(sa, saddr); 2455 if (!af) 2456 return -EINVAL; 2457 2458 socklen = pfkey_sockaddr_len(af); 2459 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2460 daddr) != af) 2461 return -EINVAL; 2462 2463 *family = af; 2464 return 0; 2465 } 2466 2467 #ifdef CONFIG_NET_KEY_MIGRATE 2468 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2469 struct xfrm_migrate *m) 2470 { 2471 int err; 2472 struct sadb_x_ipsecrequest *rq2; 2473 int mode; 2474 2475 if (len < sizeof(*rq1) || 2476 len < rq1->sadb_x_ipsecrequest_len || 2477 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2478 return -EINVAL; 2479 2480 /* old endoints */ 2481 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2482 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2483 &m->old_saddr, &m->old_daddr, 2484 &m->old_family); 2485 if (err) 2486 return err; 2487 2488 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2489 len -= rq1->sadb_x_ipsecrequest_len; 2490 2491 if (len <= sizeof(*rq2) || 2492 len < rq2->sadb_x_ipsecrequest_len || 2493 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2494 return -EINVAL; 2495 2496 /* new endpoints */ 2497 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2498 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2499 &m->new_saddr, &m->new_daddr, 2500 &m->new_family); 2501 if (err) 2502 return err; 2503 2504 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2505 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2506 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2507 return -EINVAL; 2508 2509 m->proto = rq1->sadb_x_ipsecrequest_proto; 2510 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2511 return -EINVAL; 2512 m->mode = mode; 2513 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2514 2515 return ((int)(rq1->sadb_x_ipsecrequest_len + 2516 rq2->sadb_x_ipsecrequest_len)); 2517 } 2518 2519 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2520 const struct sadb_msg *hdr, void * const *ext_hdrs) 2521 { 2522 int i, len, ret, err = -EINVAL; 2523 u8 dir; 2524 struct sadb_address *sa; 2525 struct sadb_x_kmaddress *kma; 2526 struct sadb_x_policy *pol; 2527 struct sadb_x_ipsecrequest *rq; 2528 struct xfrm_selector sel; 2529 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2530 struct xfrm_kmaddress k; 2531 struct net *net = sock_net(sk); 2532 2533 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2534 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2535 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2536 err = -EINVAL; 2537 goto out; 2538 } 2539 2540 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2541 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2542 2543 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2544 err = -EINVAL; 2545 goto out; 2546 } 2547 2548 if (kma) { 2549 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2550 k.reserved = kma->sadb_x_kmaddress_reserved; 2551 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2552 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2553 &k.local, &k.remote, &k.family); 2554 if (ret < 0) { 2555 err = ret; 2556 goto out; 2557 } 2558 } 2559 2560 dir = pol->sadb_x_policy_dir - 1; 2561 memset(&sel, 0, sizeof(sel)); 2562 2563 /* set source address info of selector */ 2564 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2565 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2566 sel.prefixlen_s = sa->sadb_address_prefixlen; 2567 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2568 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2569 if (sel.sport) 2570 sel.sport_mask = htons(0xffff); 2571 2572 /* set destination address info of selector */ 2573 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2574 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2575 sel.prefixlen_d = sa->sadb_address_prefixlen; 2576 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2577 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2578 if (sel.dport) 2579 sel.dport_mask = htons(0xffff); 2580 2581 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2582 2583 /* extract ipsecrequests */ 2584 i = 0; 2585 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2586 2587 while (len > 0 && i < XFRM_MAX_DEPTH) { 2588 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2589 if (ret < 0) { 2590 err = ret; 2591 goto out; 2592 } else { 2593 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2594 len -= ret; 2595 i++; 2596 } 2597 } 2598 2599 if (!i || len > 0) { 2600 err = -EINVAL; 2601 goto out; 2602 } 2603 2604 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2605 kma ? &k : NULL, net); 2606 2607 out: 2608 return err; 2609 } 2610 #else 2611 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2612 const struct sadb_msg *hdr, void * const *ext_hdrs) 2613 { 2614 return -ENOPROTOOPT; 2615 } 2616 #endif 2617 2618 2619 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2620 { 2621 struct net *net = sock_net(sk); 2622 unsigned int dir; 2623 int err = 0, delete; 2624 struct sadb_x_policy *pol; 2625 struct xfrm_policy *xp; 2626 struct km_event c; 2627 2628 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2629 return -EINVAL; 2630 2631 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2632 if (dir >= XFRM_POLICY_MAX) 2633 return -EINVAL; 2634 2635 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2636 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2637 dir, pol->sadb_x_policy_id, delete, &err); 2638 if (xp == NULL) 2639 return -ENOENT; 2640 2641 if (delete) { 2642 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2643 2644 if (err) 2645 goto out; 2646 c.seq = hdr->sadb_msg_seq; 2647 c.portid = hdr->sadb_msg_pid; 2648 c.data.byid = 1; 2649 c.event = XFRM_MSG_DELPOLICY; 2650 km_policy_notify(xp, dir, &c); 2651 } else { 2652 err = key_pol_get_resp(sk, xp, hdr, dir); 2653 } 2654 2655 out: 2656 xfrm_pol_put(xp); 2657 if (delete && err == 0) 2658 xfrm_garbage_collect(net); 2659 return err; 2660 } 2661 2662 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2663 { 2664 struct pfkey_sock *pfk = ptr; 2665 struct sk_buff *out_skb; 2666 struct sadb_msg *out_hdr; 2667 int err; 2668 2669 if (!pfkey_can_dump(&pfk->sk)) 2670 return -ENOBUFS; 2671 2672 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2673 if (IS_ERR(out_skb)) 2674 return PTR_ERR(out_skb); 2675 2676 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2677 if (err < 0) 2678 return err; 2679 2680 out_hdr = (struct sadb_msg *) out_skb->data; 2681 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2682 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2683 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2684 out_hdr->sadb_msg_errno = 0; 2685 out_hdr->sadb_msg_seq = count + 1; 2686 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2687 2688 if (pfk->dump.skb) 2689 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE, 2690 &pfk->sk, sock_net(&pfk->sk)); 2691 pfk->dump.skb = out_skb; 2692 2693 return 0; 2694 } 2695 2696 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2697 { 2698 struct net *net = sock_net(&pfk->sk); 2699 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2700 } 2701 2702 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2703 { 2704 struct net *net = sock_net((struct sock *)pfk); 2705 2706 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2707 } 2708 2709 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2710 { 2711 struct pfkey_sock *pfk = pfkey_sk(sk); 2712 2713 mutex_lock(&pfk->dump_lock); 2714 if (pfk->dump.dump != NULL) { 2715 mutex_unlock(&pfk->dump_lock); 2716 return -EBUSY; 2717 } 2718 2719 pfk->dump.msg_version = hdr->sadb_msg_version; 2720 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2721 pfk->dump.dump = pfkey_dump_sp; 2722 pfk->dump.done = pfkey_dump_sp_done; 2723 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2724 mutex_unlock(&pfk->dump_lock); 2725 2726 return pfkey_do_dump(pfk); 2727 } 2728 2729 static int key_notify_policy_flush(const struct km_event *c) 2730 { 2731 struct sk_buff *skb_out; 2732 struct sadb_msg *hdr; 2733 2734 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2735 if (!skb_out) 2736 return -ENOBUFS; 2737 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2738 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2739 hdr->sadb_msg_seq = c->seq; 2740 hdr->sadb_msg_pid = c->portid; 2741 hdr->sadb_msg_version = PF_KEY_V2; 2742 hdr->sadb_msg_errno = (uint8_t) 0; 2743 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2744 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2745 hdr->sadb_msg_reserved = 0; 2746 pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net); 2747 return 0; 2748 2749 } 2750 2751 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2752 { 2753 struct net *net = sock_net(sk); 2754 struct km_event c; 2755 int err, err2; 2756 2757 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2758 err2 = unicast_flush_resp(sk, hdr); 2759 if (err || err2) { 2760 if (err == -ESRCH) /* empty table - old silent behavior */ 2761 return 0; 2762 return err; 2763 } 2764 2765 c.data.type = XFRM_POLICY_TYPE_MAIN; 2766 c.event = XFRM_MSG_FLUSHPOLICY; 2767 c.portid = hdr->sadb_msg_pid; 2768 c.seq = hdr->sadb_msg_seq; 2769 c.net = net; 2770 km_policy_notify(NULL, 0, &c); 2771 2772 return 0; 2773 } 2774 2775 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2776 const struct sadb_msg *hdr, void * const *ext_hdrs); 2777 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2778 [SADB_RESERVED] = pfkey_reserved, 2779 [SADB_GETSPI] = pfkey_getspi, 2780 [SADB_UPDATE] = pfkey_add, 2781 [SADB_ADD] = pfkey_add, 2782 [SADB_DELETE] = pfkey_delete, 2783 [SADB_GET] = pfkey_get, 2784 [SADB_ACQUIRE] = pfkey_acquire, 2785 [SADB_REGISTER] = pfkey_register, 2786 [SADB_EXPIRE] = NULL, 2787 [SADB_FLUSH] = pfkey_flush, 2788 [SADB_DUMP] = pfkey_dump, 2789 [SADB_X_PROMISC] = pfkey_promisc, 2790 [SADB_X_PCHANGE] = NULL, 2791 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2792 [SADB_X_SPDADD] = pfkey_spdadd, 2793 [SADB_X_SPDDELETE] = pfkey_spddelete, 2794 [SADB_X_SPDGET] = pfkey_spdget, 2795 [SADB_X_SPDACQUIRE] = NULL, 2796 [SADB_X_SPDDUMP] = pfkey_spddump, 2797 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2798 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2799 [SADB_X_SPDDELETE2] = pfkey_spdget, 2800 [SADB_X_MIGRATE] = pfkey_migrate, 2801 }; 2802 2803 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2804 { 2805 void *ext_hdrs[SADB_EXT_MAX]; 2806 int err; 2807 2808 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), 2809 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2810 2811 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2812 err = parse_exthdrs(skb, hdr, ext_hdrs); 2813 if (!err) { 2814 err = -EOPNOTSUPP; 2815 if (pfkey_funcs[hdr->sadb_msg_type]) 2816 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2817 } 2818 return err; 2819 } 2820 2821 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2822 { 2823 struct sadb_msg *hdr = NULL; 2824 2825 if (skb->len < sizeof(*hdr)) { 2826 *errp = -EMSGSIZE; 2827 } else { 2828 hdr = (struct sadb_msg *) skb->data; 2829 if (hdr->sadb_msg_version != PF_KEY_V2 || 2830 hdr->sadb_msg_reserved != 0 || 2831 (hdr->sadb_msg_type <= SADB_RESERVED || 2832 hdr->sadb_msg_type > SADB_MAX)) { 2833 hdr = NULL; 2834 *errp = -EINVAL; 2835 } else if (hdr->sadb_msg_len != (skb->len / 2836 sizeof(uint64_t)) || 2837 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2838 sizeof(uint64_t))) { 2839 hdr = NULL; 2840 *errp = -EMSGSIZE; 2841 } else { 2842 *errp = 0; 2843 } 2844 } 2845 return hdr; 2846 } 2847 2848 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2849 const struct xfrm_algo_desc *d) 2850 { 2851 unsigned int id = d->desc.sadb_alg_id; 2852 2853 if (id >= sizeof(t->aalgos) * 8) 2854 return 0; 2855 2856 return (t->aalgos >> id) & 1; 2857 } 2858 2859 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2860 const struct xfrm_algo_desc *d) 2861 { 2862 unsigned int id = d->desc.sadb_alg_id; 2863 2864 if (id >= sizeof(t->ealgos) * 8) 2865 return 0; 2866 2867 return (t->ealgos >> id) & 1; 2868 } 2869 2870 static int count_ah_combs(const struct xfrm_tmpl *t) 2871 { 2872 int i, sz = 0; 2873 2874 for (i = 0; ; i++) { 2875 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2876 if (!aalg) 2877 break; 2878 if (!aalg->pfkey_supported) 2879 continue; 2880 if (aalg_tmpl_set(t, aalg) && aalg->available) 2881 sz += sizeof(struct sadb_comb); 2882 } 2883 return sz + sizeof(struct sadb_prop); 2884 } 2885 2886 static int count_esp_combs(const struct xfrm_tmpl *t) 2887 { 2888 int i, k, sz = 0; 2889 2890 for (i = 0; ; i++) { 2891 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2892 if (!ealg) 2893 break; 2894 2895 if (!ealg->pfkey_supported) 2896 continue; 2897 2898 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2899 continue; 2900 2901 for (k = 1; ; k++) { 2902 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2903 if (!aalg) 2904 break; 2905 2906 if (!aalg->pfkey_supported) 2907 continue; 2908 2909 if (aalg_tmpl_set(t, aalg) && aalg->available) 2910 sz += sizeof(struct sadb_comb); 2911 } 2912 } 2913 return sz + sizeof(struct sadb_prop); 2914 } 2915 2916 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2917 { 2918 struct sadb_prop *p; 2919 int i; 2920 2921 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2922 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2923 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2924 p->sadb_prop_replay = 32; 2925 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2926 2927 for (i = 0; ; i++) { 2928 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2929 if (!aalg) 2930 break; 2931 2932 if (!aalg->pfkey_supported) 2933 continue; 2934 2935 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2936 struct sadb_comb *c; 2937 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2938 memset(c, 0, sizeof(*c)); 2939 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2940 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2941 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2942 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2943 c->sadb_comb_hard_addtime = 24*60*60; 2944 c->sadb_comb_soft_addtime = 20*60*60; 2945 c->sadb_comb_hard_usetime = 8*60*60; 2946 c->sadb_comb_soft_usetime = 7*60*60; 2947 } 2948 } 2949 } 2950 2951 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2952 { 2953 struct sadb_prop *p; 2954 int i, k; 2955 2956 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2957 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2958 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2959 p->sadb_prop_replay = 32; 2960 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2961 2962 for (i=0; ; i++) { 2963 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2964 if (!ealg) 2965 break; 2966 2967 if (!ealg->pfkey_supported) 2968 continue; 2969 2970 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2971 continue; 2972 2973 for (k = 1; ; k++) { 2974 struct sadb_comb *c; 2975 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2976 if (!aalg) 2977 break; 2978 if (!aalg->pfkey_supported) 2979 continue; 2980 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2981 continue; 2982 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2983 memset(c, 0, sizeof(*c)); 2984 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2985 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2986 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2987 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2988 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2989 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2990 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2991 c->sadb_comb_hard_addtime = 24*60*60; 2992 c->sadb_comb_soft_addtime = 20*60*60; 2993 c->sadb_comb_hard_usetime = 8*60*60; 2994 c->sadb_comb_soft_usetime = 7*60*60; 2995 } 2996 } 2997 } 2998 2999 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3000 { 3001 return 0; 3002 } 3003 3004 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3005 { 3006 struct sk_buff *out_skb; 3007 struct sadb_msg *out_hdr; 3008 int hard; 3009 int hsc; 3010 3011 hard = c->data.hard; 3012 if (hard) 3013 hsc = 2; 3014 else 3015 hsc = 1; 3016 3017 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3018 if (IS_ERR(out_skb)) 3019 return PTR_ERR(out_skb); 3020 3021 out_hdr = (struct sadb_msg *) out_skb->data; 3022 out_hdr->sadb_msg_version = PF_KEY_V2; 3023 out_hdr->sadb_msg_type = SADB_EXPIRE; 3024 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3025 out_hdr->sadb_msg_errno = 0; 3026 out_hdr->sadb_msg_reserved = 0; 3027 out_hdr->sadb_msg_seq = 0; 3028 out_hdr->sadb_msg_pid = 0; 3029 3030 pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x)); 3031 return 0; 3032 } 3033 3034 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3035 { 3036 struct net *net = x ? xs_net(x) : c->net; 3037 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3038 3039 if (atomic_read(&net_pfkey->socks_nr) == 0) 3040 return 0; 3041 3042 switch (c->event) { 3043 case XFRM_MSG_EXPIRE: 3044 return key_notify_sa_expire(x, c); 3045 case XFRM_MSG_DELSA: 3046 case XFRM_MSG_NEWSA: 3047 case XFRM_MSG_UPDSA: 3048 return key_notify_sa(x, c); 3049 case XFRM_MSG_FLUSHSA: 3050 return key_notify_sa_flush(c); 3051 case XFRM_MSG_NEWAE: /* not yet supported */ 3052 break; 3053 default: 3054 pr_err("pfkey: Unknown SA event %d\n", c->event); 3055 break; 3056 } 3057 3058 return 0; 3059 } 3060 3061 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3062 { 3063 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3064 return 0; 3065 3066 switch (c->event) { 3067 case XFRM_MSG_POLEXPIRE: 3068 return key_notify_policy_expire(xp, c); 3069 case XFRM_MSG_DELPOLICY: 3070 case XFRM_MSG_NEWPOLICY: 3071 case XFRM_MSG_UPDPOLICY: 3072 return key_notify_policy(xp, dir, c); 3073 case XFRM_MSG_FLUSHPOLICY: 3074 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3075 break; 3076 return key_notify_policy_flush(c); 3077 default: 3078 pr_err("pfkey: Unknown policy event %d\n", c->event); 3079 break; 3080 } 3081 3082 return 0; 3083 } 3084 3085 static u32 get_acqseq(void) 3086 { 3087 u32 res; 3088 static atomic_t acqseq; 3089 3090 do { 3091 res = atomic_inc_return(&acqseq); 3092 } while (!res); 3093 return res; 3094 } 3095 3096 static bool pfkey_is_alive(const struct km_event *c) 3097 { 3098 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3099 struct sock *sk; 3100 bool is_alive = false; 3101 3102 rcu_read_lock(); 3103 sk_for_each_rcu(sk, &net_pfkey->table) { 3104 if (pfkey_sk(sk)->registered) { 3105 is_alive = true; 3106 break; 3107 } 3108 } 3109 rcu_read_unlock(); 3110 3111 return is_alive; 3112 } 3113 3114 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3115 { 3116 struct sk_buff *skb; 3117 struct sadb_msg *hdr; 3118 struct sadb_address *addr; 3119 struct sadb_x_policy *pol; 3120 int sockaddr_size; 3121 int size; 3122 struct sadb_x_sec_ctx *sec_ctx; 3123 struct xfrm_sec_ctx *xfrm_ctx; 3124 int ctx_size = 0; 3125 3126 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3127 if (!sockaddr_size) 3128 return -EINVAL; 3129 3130 size = sizeof(struct sadb_msg) + 3131 (sizeof(struct sadb_address) * 2) + 3132 (sockaddr_size * 2) + 3133 sizeof(struct sadb_x_policy); 3134 3135 if (x->id.proto == IPPROTO_AH) 3136 size += count_ah_combs(t); 3137 else if (x->id.proto == IPPROTO_ESP) 3138 size += count_esp_combs(t); 3139 3140 if ((xfrm_ctx = x->security)) { 3141 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3142 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3143 } 3144 3145 skb = alloc_skb(size + 16, GFP_ATOMIC); 3146 if (skb == NULL) 3147 return -ENOMEM; 3148 3149 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3150 hdr->sadb_msg_version = PF_KEY_V2; 3151 hdr->sadb_msg_type = SADB_ACQUIRE; 3152 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3153 hdr->sadb_msg_len = size / sizeof(uint64_t); 3154 hdr->sadb_msg_errno = 0; 3155 hdr->sadb_msg_reserved = 0; 3156 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3157 hdr->sadb_msg_pid = 0; 3158 3159 /* src address */ 3160 addr = (struct sadb_address*) skb_put(skb, 3161 sizeof(struct sadb_address)+sockaddr_size); 3162 addr->sadb_address_len = 3163 (sizeof(struct sadb_address)+sockaddr_size)/ 3164 sizeof(uint64_t); 3165 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3166 addr->sadb_address_proto = 0; 3167 addr->sadb_address_reserved = 0; 3168 addr->sadb_address_prefixlen = 3169 pfkey_sockaddr_fill(&x->props.saddr, 0, 3170 (struct sockaddr *) (addr + 1), 3171 x->props.family); 3172 if (!addr->sadb_address_prefixlen) 3173 BUG(); 3174 3175 /* dst address */ 3176 addr = (struct sadb_address*) skb_put(skb, 3177 sizeof(struct sadb_address)+sockaddr_size); 3178 addr->sadb_address_len = 3179 (sizeof(struct sadb_address)+sockaddr_size)/ 3180 sizeof(uint64_t); 3181 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3182 addr->sadb_address_proto = 0; 3183 addr->sadb_address_reserved = 0; 3184 addr->sadb_address_prefixlen = 3185 pfkey_sockaddr_fill(&x->id.daddr, 0, 3186 (struct sockaddr *) (addr + 1), 3187 x->props.family); 3188 if (!addr->sadb_address_prefixlen) 3189 BUG(); 3190 3191 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3192 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3193 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3194 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3195 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3196 pol->sadb_x_policy_reserved = 0; 3197 pol->sadb_x_policy_id = xp->index; 3198 pol->sadb_x_policy_priority = xp->priority; 3199 3200 /* Set sadb_comb's. */ 3201 if (x->id.proto == IPPROTO_AH) 3202 dump_ah_combs(skb, t); 3203 else if (x->id.proto == IPPROTO_ESP) 3204 dump_esp_combs(skb, t); 3205 3206 /* security context */ 3207 if (xfrm_ctx) { 3208 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3209 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3210 sec_ctx->sadb_x_sec_len = 3211 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3212 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3213 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3214 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3215 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3216 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3217 xfrm_ctx->ctx_len); 3218 } 3219 3220 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x)); 3221 } 3222 3223 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3224 u8 *data, int len, int *dir) 3225 { 3226 struct net *net = sock_net(sk); 3227 struct xfrm_policy *xp; 3228 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3229 struct sadb_x_sec_ctx *sec_ctx; 3230 3231 switch (sk->sk_family) { 3232 case AF_INET: 3233 if (opt != IP_IPSEC_POLICY) { 3234 *dir = -EOPNOTSUPP; 3235 return NULL; 3236 } 3237 break; 3238 #if IS_ENABLED(CONFIG_IPV6) 3239 case AF_INET6: 3240 if (opt != IPV6_IPSEC_POLICY) { 3241 *dir = -EOPNOTSUPP; 3242 return NULL; 3243 } 3244 break; 3245 #endif 3246 default: 3247 *dir = -EINVAL; 3248 return NULL; 3249 } 3250 3251 *dir = -EINVAL; 3252 3253 if (len < sizeof(struct sadb_x_policy) || 3254 pol->sadb_x_policy_len*8 > len || 3255 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3256 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3257 return NULL; 3258 3259 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3260 if (xp == NULL) { 3261 *dir = -ENOBUFS; 3262 return NULL; 3263 } 3264 3265 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3266 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3267 3268 xp->lft.soft_byte_limit = XFRM_INF; 3269 xp->lft.hard_byte_limit = XFRM_INF; 3270 xp->lft.soft_packet_limit = XFRM_INF; 3271 xp->lft.hard_packet_limit = XFRM_INF; 3272 xp->family = sk->sk_family; 3273 3274 xp->xfrm_nr = 0; 3275 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3276 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3277 goto out; 3278 3279 /* security context too */ 3280 if (len >= (pol->sadb_x_policy_len*8 + 3281 sizeof(struct sadb_x_sec_ctx))) { 3282 char *p = (char *)pol; 3283 struct xfrm_user_sec_ctx *uctx; 3284 3285 p += pol->sadb_x_policy_len*8; 3286 sec_ctx = (struct sadb_x_sec_ctx *)p; 3287 if (len < pol->sadb_x_policy_len*8 + 3288 sec_ctx->sadb_x_sec_len*8) { 3289 *dir = -EINVAL; 3290 goto out; 3291 } 3292 if ((*dir = verify_sec_ctx_len(p))) 3293 goto out; 3294 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3295 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3296 kfree(uctx); 3297 3298 if (*dir) 3299 goto out; 3300 } 3301 3302 *dir = pol->sadb_x_policy_dir-1; 3303 return xp; 3304 3305 out: 3306 xp->walk.dead = 1; 3307 xfrm_policy_destroy(xp); 3308 return NULL; 3309 } 3310 3311 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3312 { 3313 struct sk_buff *skb; 3314 struct sadb_msg *hdr; 3315 struct sadb_sa *sa; 3316 struct sadb_address *addr; 3317 struct sadb_x_nat_t_port *n_port; 3318 int sockaddr_size; 3319 int size; 3320 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3321 struct xfrm_encap_tmpl *natt = NULL; 3322 3323 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3324 if (!sockaddr_size) 3325 return -EINVAL; 3326 3327 if (!satype) 3328 return -EINVAL; 3329 3330 if (!x->encap) 3331 return -EINVAL; 3332 3333 natt = x->encap; 3334 3335 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3336 * 3337 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3338 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3339 */ 3340 3341 size = sizeof(struct sadb_msg) + 3342 sizeof(struct sadb_sa) + 3343 (sizeof(struct sadb_address) * 2) + 3344 (sockaddr_size * 2) + 3345 (sizeof(struct sadb_x_nat_t_port) * 2); 3346 3347 skb = alloc_skb(size + 16, GFP_ATOMIC); 3348 if (skb == NULL) 3349 return -ENOMEM; 3350 3351 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3352 hdr->sadb_msg_version = PF_KEY_V2; 3353 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3354 hdr->sadb_msg_satype = satype; 3355 hdr->sadb_msg_len = size / sizeof(uint64_t); 3356 hdr->sadb_msg_errno = 0; 3357 hdr->sadb_msg_reserved = 0; 3358 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3359 hdr->sadb_msg_pid = 0; 3360 3361 /* SA */ 3362 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3363 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3364 sa->sadb_sa_exttype = SADB_EXT_SA; 3365 sa->sadb_sa_spi = x->id.spi; 3366 sa->sadb_sa_replay = 0; 3367 sa->sadb_sa_state = 0; 3368 sa->sadb_sa_auth = 0; 3369 sa->sadb_sa_encrypt = 0; 3370 sa->sadb_sa_flags = 0; 3371 3372 /* ADDRESS_SRC (old addr) */ 3373 addr = (struct sadb_address*) 3374 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3375 addr->sadb_address_len = 3376 (sizeof(struct sadb_address)+sockaddr_size)/ 3377 sizeof(uint64_t); 3378 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3379 addr->sadb_address_proto = 0; 3380 addr->sadb_address_reserved = 0; 3381 addr->sadb_address_prefixlen = 3382 pfkey_sockaddr_fill(&x->props.saddr, 0, 3383 (struct sockaddr *) (addr + 1), 3384 x->props.family); 3385 if (!addr->sadb_address_prefixlen) 3386 BUG(); 3387 3388 /* NAT_T_SPORT (old port) */ 3389 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3390 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3391 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3392 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3393 n_port->sadb_x_nat_t_port_reserved = 0; 3394 3395 /* ADDRESS_DST (new addr) */ 3396 addr = (struct sadb_address*) 3397 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 = (struct sadb_x_nat_t_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, BROADCAST_REGISTERED, NULL, xs_net(x)); 3419 } 3420 3421 #ifdef CONFIG_NET_KEY_MIGRATE 3422 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3423 const struct xfrm_selector *sel) 3424 { 3425 struct sadb_address *addr; 3426 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3427 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3428 addr->sadb_address_exttype = type; 3429 addr->sadb_address_proto = sel->proto; 3430 addr->sadb_address_reserved = 0; 3431 3432 switch (type) { 3433 case SADB_EXT_ADDRESS_SRC: 3434 addr->sadb_address_prefixlen = sel->prefixlen_s; 3435 pfkey_sockaddr_fill(&sel->saddr, 0, 3436 (struct sockaddr *)(addr + 1), 3437 sel->family); 3438 break; 3439 case SADB_EXT_ADDRESS_DST: 3440 addr->sadb_address_prefixlen = sel->prefixlen_d; 3441 pfkey_sockaddr_fill(&sel->daddr, 0, 3442 (struct sockaddr *)(addr + 1), 3443 sel->family); 3444 break; 3445 default: 3446 return -EINVAL; 3447 } 3448 3449 return 0; 3450 } 3451 3452 3453 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3454 { 3455 struct sadb_x_kmaddress *kma; 3456 u8 *sa; 3457 int family = k->family; 3458 int socklen = pfkey_sockaddr_len(family); 3459 int size_req; 3460 3461 size_req = (sizeof(struct sadb_x_kmaddress) + 3462 pfkey_sockaddr_pair_size(family)); 3463 3464 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3465 memset(kma, 0, 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 = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3492 memset(rq, 0, size_req); 3493 rq->sadb_x_ipsecrequest_len = size_req; 3494 rq->sadb_x_ipsecrequest_proto = proto; 3495 rq->sadb_x_ipsecrequest_mode = mode; 3496 rq->sadb_x_ipsecrequest_level = level; 3497 rq->sadb_x_ipsecrequest_reqid = reqid; 3498 3499 sa = (u8 *) (rq + 1); 3500 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3501 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3502 return -EINVAL; 3503 3504 return 0; 3505 } 3506 #endif 3507 3508 #ifdef CONFIG_NET_KEY_MIGRATE 3509 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3510 const struct xfrm_migrate *m, int num_bundles, 3511 const struct xfrm_kmaddress *k) 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 = (struct sadb_msg *)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 = (struct sadb_x_policy *)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, 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 { 3623 return -ENOPROTOOPT; 3624 } 3625 #endif 3626 3627 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3628 { 3629 struct sock *sk = sock->sk; 3630 struct sk_buff *skb = NULL; 3631 struct sadb_msg *hdr = NULL; 3632 int err; 3633 struct net *net = sock_net(sk); 3634 3635 err = -EOPNOTSUPP; 3636 if (msg->msg_flags & MSG_OOB) 3637 goto out; 3638 3639 err = -EMSGSIZE; 3640 if ((unsigned int)len > sk->sk_sndbuf - 32) 3641 goto out; 3642 3643 err = -ENOBUFS; 3644 skb = alloc_skb(len, GFP_KERNEL); 3645 if (skb == NULL) 3646 goto out; 3647 3648 err = -EFAULT; 3649 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3650 goto out; 3651 3652 hdr = pfkey_get_base_msg(skb, &err); 3653 if (!hdr) 3654 goto out; 3655 3656 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3657 err = pfkey_process(sk, skb, hdr); 3658 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3659 3660 out: 3661 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3662 err = 0; 3663 kfree_skb(skb); 3664 3665 return err ? : len; 3666 } 3667 3668 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3669 int flags) 3670 { 3671 struct sock *sk = sock->sk; 3672 struct pfkey_sock *pfk = pfkey_sk(sk); 3673 struct sk_buff *skb; 3674 int copied, err; 3675 3676 err = -EINVAL; 3677 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3678 goto out; 3679 3680 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3681 if (skb == NULL) 3682 goto out; 3683 3684 copied = skb->len; 3685 if (copied > len) { 3686 msg->msg_flags |= MSG_TRUNC; 3687 copied = len; 3688 } 3689 3690 skb_reset_transport_header(skb); 3691 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3692 if (err) 3693 goto out_free; 3694 3695 sock_recv_ts_and_drops(msg, sk, skb); 3696 3697 err = (flags & MSG_TRUNC) ? skb->len : copied; 3698 3699 if (pfk->dump.dump != NULL && 3700 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3701 pfkey_do_dump(pfk); 3702 3703 out_free: 3704 skb_free_datagram(sk, skb); 3705 out: 3706 return err; 3707 } 3708 3709 static const struct proto_ops pfkey_ops = { 3710 .family = PF_KEY, 3711 .owner = THIS_MODULE, 3712 /* Operations that make no sense on pfkey sockets. */ 3713 .bind = sock_no_bind, 3714 .connect = sock_no_connect, 3715 .socketpair = sock_no_socketpair, 3716 .accept = sock_no_accept, 3717 .getname = sock_no_getname, 3718 .ioctl = sock_no_ioctl, 3719 .listen = sock_no_listen, 3720 .shutdown = sock_no_shutdown, 3721 .setsockopt = sock_no_setsockopt, 3722 .getsockopt = sock_no_getsockopt, 3723 .mmap = sock_no_mmap, 3724 .sendpage = sock_no_sendpage, 3725 3726 /* Now the operations that really occur. */ 3727 .release = pfkey_release, 3728 .poll = datagram_poll, 3729 .sendmsg = pfkey_sendmsg, 3730 .recvmsg = pfkey_recvmsg, 3731 }; 3732 3733 static const struct net_proto_family pfkey_family_ops = { 3734 .family = PF_KEY, 3735 .create = pfkey_create, 3736 .owner = THIS_MODULE, 3737 }; 3738 3739 #ifdef CONFIG_PROC_FS 3740 static int pfkey_seq_show(struct seq_file *f, void *v) 3741 { 3742 struct sock *s = sk_entry(v); 3743 3744 if (v == SEQ_START_TOKEN) 3745 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3746 else 3747 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3748 s, 3749 atomic_read(&s->sk_refcnt), 3750 sk_rmem_alloc_get(s), 3751 sk_wmem_alloc_get(s), 3752 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3753 sock_i_ino(s) 3754 ); 3755 return 0; 3756 } 3757 3758 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3759 __acquires(rcu) 3760 { 3761 struct net *net = seq_file_net(f); 3762 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3763 3764 rcu_read_lock(); 3765 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3766 } 3767 3768 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3769 { 3770 struct net *net = seq_file_net(f); 3771 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3772 3773 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3774 } 3775 3776 static void pfkey_seq_stop(struct seq_file *f, void *v) 3777 __releases(rcu) 3778 { 3779 rcu_read_unlock(); 3780 } 3781 3782 static const struct seq_operations pfkey_seq_ops = { 3783 .start = pfkey_seq_start, 3784 .next = pfkey_seq_next, 3785 .stop = pfkey_seq_stop, 3786 .show = pfkey_seq_show, 3787 }; 3788 3789 static int pfkey_seq_open(struct inode *inode, struct file *file) 3790 { 3791 return seq_open_net(inode, file, &pfkey_seq_ops, 3792 sizeof(struct seq_net_private)); 3793 } 3794 3795 static const struct file_operations pfkey_proc_ops = { 3796 .open = pfkey_seq_open, 3797 .read = seq_read, 3798 .llseek = seq_lseek, 3799 .release = seq_release_net, 3800 }; 3801 3802 static int __net_init pfkey_init_proc(struct net *net) 3803 { 3804 struct proc_dir_entry *e; 3805 3806 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3807 if (e == NULL) 3808 return -ENOMEM; 3809 3810 return 0; 3811 } 3812 3813 static void __net_exit pfkey_exit_proc(struct net *net) 3814 { 3815 remove_proc_entry("pfkey", net->proc_net); 3816 } 3817 #else 3818 static inline int pfkey_init_proc(struct net *net) 3819 { 3820 return 0; 3821 } 3822 3823 static inline void pfkey_exit_proc(struct net *net) 3824 { 3825 } 3826 #endif 3827 3828 static struct xfrm_mgr pfkeyv2_mgr = 3829 { 3830 .notify = pfkey_send_notify, 3831 .acquire = pfkey_send_acquire, 3832 .compile_policy = pfkey_compile_policy, 3833 .new_mapping = pfkey_send_new_mapping, 3834 .notify_policy = pfkey_send_policy_notify, 3835 .migrate = pfkey_send_migrate, 3836 .is_alive = pfkey_is_alive, 3837 }; 3838 3839 static int __net_init pfkey_net_init(struct net *net) 3840 { 3841 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3842 int rv; 3843 3844 INIT_HLIST_HEAD(&net_pfkey->table); 3845 atomic_set(&net_pfkey->socks_nr, 0); 3846 3847 rv = pfkey_init_proc(net); 3848 3849 return rv; 3850 } 3851 3852 static void __net_exit pfkey_net_exit(struct net *net) 3853 { 3854 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3855 3856 pfkey_exit_proc(net); 3857 BUG_ON(!hlist_empty(&net_pfkey->table)); 3858 } 3859 3860 static struct pernet_operations pfkey_net_ops = { 3861 .init = pfkey_net_init, 3862 .exit = pfkey_net_exit, 3863 .id = &pfkey_net_id, 3864 .size = sizeof(struct netns_pfkey), 3865 }; 3866 3867 static void __exit ipsec_pfkey_exit(void) 3868 { 3869 xfrm_unregister_km(&pfkeyv2_mgr); 3870 sock_unregister(PF_KEY); 3871 unregister_pernet_subsys(&pfkey_net_ops); 3872 proto_unregister(&key_proto); 3873 } 3874 3875 static int __init ipsec_pfkey_init(void) 3876 { 3877 int err = proto_register(&key_proto, 0); 3878 3879 if (err != 0) 3880 goto out; 3881 3882 err = register_pernet_subsys(&pfkey_net_ops); 3883 if (err != 0) 3884 goto out_unregister_key_proto; 3885 err = sock_register(&pfkey_family_ops); 3886 if (err != 0) 3887 goto out_unregister_pernet; 3888 err = xfrm_register_km(&pfkeyv2_mgr); 3889 if (err != 0) 3890 goto out_sock_unregister; 3891 out: 3892 return err; 3893 3894 out_sock_unregister: 3895 sock_unregister(PF_KEY); 3896 out_unregister_pernet: 3897 unregister_pernet_subsys(&pfkey_net_ops); 3898 out_unregister_key_proto: 3899 proto_unregister(&key_proto); 3900 goto out; 3901 } 3902 3903 module_init(ipsec_pfkey_init); 3904 module_exit(ipsec_pfkey_exit); 3905 MODULE_LICENSE("GPL"); 3906 MODULE_ALIAS_NETPROTO(PF_KEY); 3907