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