1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <net/net_namespace.h> 31 #include <net/netns/generic.h> 32 #include <net/xfrm.h> 33 34 #include <net/sock.h> 35 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 38 39 static unsigned int pfkey_net_id __read_mostly; 40 struct netns_pfkey { 41 /* List of all pfkey sockets. */ 42 struct hlist_head table; 43 atomic_t socks_nr; 44 }; 45 static DEFINE_MUTEX(pfkey_mutex); 46 47 #define DUMMY_MARK 0 48 static const struct xfrm_mark dummy_mark = {0, 0}; 49 struct pfkey_sock { 50 /* struct sock must be the first member of struct pfkey_sock */ 51 struct sock sk; 52 int registered; 53 int promisc; 54 55 struct { 56 uint8_t msg_version; 57 uint32_t msg_portid; 58 int (*dump)(struct pfkey_sock *sk); 59 void (*done)(struct pfkey_sock *sk); 60 union { 61 struct xfrm_policy_walk policy; 62 struct xfrm_state_walk state; 63 } u; 64 struct sk_buff *skb; 65 } dump; 66 struct mutex dump_lock; 67 }; 68 69 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 70 xfrm_address_t *saddr, xfrm_address_t *daddr, 71 u16 *family); 72 73 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 74 { 75 return (struct pfkey_sock *)sk; 76 } 77 78 static int pfkey_can_dump(const struct sock *sk) 79 { 80 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 81 return 1; 82 return 0; 83 } 84 85 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 86 { 87 if (pfk->dump.dump) { 88 if (pfk->dump.skb) { 89 kfree_skb(pfk->dump.skb); 90 pfk->dump.skb = NULL; 91 } 92 pfk->dump.done(pfk); 93 pfk->dump.dump = NULL; 94 pfk->dump.done = NULL; 95 } 96 } 97 98 static void pfkey_sock_destruct(struct sock *sk) 99 { 100 struct net *net = sock_net(sk); 101 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 102 103 pfkey_terminate_dump(pfkey_sk(sk)); 104 skb_queue_purge(&sk->sk_receive_queue); 105 106 if (!sock_flag(sk, SOCK_DEAD)) { 107 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 108 return; 109 } 110 111 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 112 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 113 114 atomic_dec(&net_pfkey->socks_nr); 115 } 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 struct net *net = sock_net(sk); 122 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 123 124 mutex_lock(&pfkey_mutex); 125 sk_add_node_rcu(sk, &net_pfkey->table); 126 mutex_unlock(&pfkey_mutex); 127 } 128 129 static void pfkey_remove(struct sock *sk) 130 { 131 mutex_lock(&pfkey_mutex); 132 sk_del_node_init_rcu(sk); 133 mutex_unlock(&pfkey_mutex); 134 } 135 136 static struct proto key_proto = { 137 .name = "KEY", 138 .owner = THIS_MODULE, 139 .obj_size = sizeof(struct pfkey_sock), 140 }; 141 142 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 143 int kern) 144 { 145 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 146 struct sock *sk; 147 struct pfkey_sock *pfk; 148 int err; 149 150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 151 return -EPERM; 152 if (sock->type != SOCK_RAW) 153 return -ESOCKTNOSUPPORT; 154 if (protocol != PF_KEY_V2) 155 return -EPROTONOSUPPORT; 156 157 err = -ENOMEM; 158 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 159 if (sk == NULL) 160 goto out; 161 162 pfk = pfkey_sk(sk); 163 mutex_init(&pfk->dump_lock); 164 165 sock->ops = &pfkey_ops; 166 sock_init_data(sock, sk); 167 168 sk->sk_family = PF_KEY; 169 sk->sk_destruct = pfkey_sock_destruct; 170 171 atomic_inc(&net_pfkey->socks_nr); 172 173 pfkey_insert(sk); 174 175 return 0; 176 out: 177 return err; 178 } 179 180 static int pfkey_release(struct socket *sock) 181 { 182 struct sock *sk = sock->sk; 183 184 if (!sk) 185 return 0; 186 187 pfkey_remove(sk); 188 189 sock_orphan(sk); 190 sock->sk = NULL; 191 skb_queue_purge(&sk->sk_write_queue); 192 193 synchronize_rcu(); 194 sock_put(sk); 195 196 return 0; 197 } 198 199 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 200 gfp_t allocation, struct sock *sk) 201 { 202 int err = -ENOBUFS; 203 204 sock_hold(sk); 205 if (*skb2 == NULL) { 206 if (atomic_read(&skb->users) != 1) { 207 *skb2 = skb_clone(skb, allocation); 208 } else { 209 *skb2 = skb; 210 atomic_inc(&skb->users); 211 } 212 } 213 if (*skb2 != NULL) { 214 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 215 skb_set_owner_r(*skb2, sk); 216 skb_queue_tail(&sk->sk_receive_queue, *skb2); 217 sk->sk_data_ready(sk); 218 *skb2 = NULL; 219 err = 0; 220 } 221 } 222 sock_put(sk); 223 return err; 224 } 225 226 /* Send SKB to all pfkey sockets matching selected criteria. */ 227 #define BROADCAST_ALL 0 228 #define BROADCAST_ONE 1 229 #define BROADCAST_REGISTERED 2 230 #define BROADCAST_PROMISC_ONLY 4 231 static int pfkey_broadcast(struct sk_buff *skb, 232 int broadcast_flags, struct sock *one_sk, 233 struct net *net) 234 { 235 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 236 struct sock *sk; 237 struct sk_buff *skb2 = NULL; 238 int err = -ESRCH; 239 240 /* XXX Do we need something like netlink_overrun? I think 241 * XXX PF_KEY socket apps will not mind current behavior. 242 */ 243 if (!skb) 244 return -ENOMEM; 245 246 rcu_read_lock(); 247 sk_for_each_rcu(sk, &net_pfkey->table) { 248 struct pfkey_sock *pfk = pfkey_sk(sk); 249 int err2; 250 251 /* Yes, it means that if you are meant to receive this 252 * pfkey message you receive it twice as promiscuous 253 * socket. 254 */ 255 if (pfk->promisc) 256 pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 257 258 /* the exact target will be processed later */ 259 if (sk == one_sk) 260 continue; 261 if (broadcast_flags != BROADCAST_ALL) { 262 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 263 continue; 264 if ((broadcast_flags & BROADCAST_REGISTERED) && 265 !pfk->registered) 266 continue; 267 if (broadcast_flags & BROADCAST_ONE) 268 continue; 269 } 270 271 err2 = pfkey_broadcast_one(skb, &skb2, GFP_ATOMIC, sk); 272 273 /* Error is cleared after successful sending to at least one 274 * registered KM */ 275 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 276 err = err2; 277 } 278 rcu_read_unlock(); 279 280 if (one_sk != NULL) 281 err = pfkey_broadcast_one(skb, &skb2, GFP_KERNEL, one_sk); 282 283 kfree_skb(skb2); 284 kfree_skb(skb); 285 return err; 286 } 287 288 static int pfkey_do_dump(struct pfkey_sock *pfk) 289 { 290 struct sadb_msg *hdr; 291 int rc; 292 293 mutex_lock(&pfk->dump_lock); 294 if (!pfk->dump.dump) { 295 rc = 0; 296 goto out; 297 } 298 299 rc = pfk->dump.dump(pfk); 300 if (rc == -ENOBUFS) { 301 rc = 0; 302 goto out; 303 } 304 305 if (pfk->dump.skb) { 306 if (!pfkey_can_dump(&pfk->sk)) { 307 rc = 0; 308 goto out; 309 } 310 311 hdr = (struct sadb_msg *) pfk->dump.skb->data; 312 hdr->sadb_msg_seq = 0; 313 hdr->sadb_msg_errno = rc; 314 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE, 315 &pfk->sk, sock_net(&pfk->sk)); 316 pfk->dump.skb = NULL; 317 } 318 319 pfkey_terminate_dump(pfk); 320 321 out: 322 mutex_unlock(&pfk->dump_lock); 323 return rc; 324 } 325 326 static inline void pfkey_hdr_dup(struct sadb_msg *new, 327 const struct sadb_msg *orig) 328 { 329 *new = *orig; 330 } 331 332 static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 333 { 334 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 335 struct sadb_msg *hdr; 336 337 if (!skb) 338 return -ENOBUFS; 339 340 /* Woe be to the platform trying to support PFKEY yet 341 * having normal errnos outside the 1-255 range, inclusive. 342 */ 343 err = -err; 344 if (err == ERESTARTSYS || 345 err == ERESTARTNOHAND || 346 err == ERESTARTNOINTR) 347 err = EINTR; 348 if (err >= 512) 349 err = EINVAL; 350 BUG_ON(err <= 0 || err >= 256); 351 352 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 353 pfkey_hdr_dup(hdr, orig); 354 hdr->sadb_msg_errno = (uint8_t) err; 355 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 356 sizeof(uint64_t)); 357 358 pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk)); 359 360 return 0; 361 } 362 363 static const u8 sadb_ext_min_len[] = { 364 [SADB_EXT_RESERVED] = (u8) 0, 365 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 366 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 367 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 368 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 369 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 370 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 371 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 372 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 373 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 374 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 375 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 376 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 377 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 378 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 379 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 380 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 381 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 382 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 383 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 384 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 385 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 386 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 387 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 388 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 389 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 390 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 391 }; 392 393 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 394 static int verify_address_len(const void *p) 395 { 396 const struct sadb_address *sp = p; 397 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 398 const struct sockaddr_in *sin; 399 #if IS_ENABLED(CONFIG_IPV6) 400 const struct sockaddr_in6 *sin6; 401 #endif 402 int len; 403 404 switch (addr->sa_family) { 405 case AF_INET: 406 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 407 if (sp->sadb_address_len != len || 408 sp->sadb_address_prefixlen > 32) 409 return -EINVAL; 410 break; 411 #if IS_ENABLED(CONFIG_IPV6) 412 case AF_INET6: 413 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 414 if (sp->sadb_address_len != len || 415 sp->sadb_address_prefixlen > 128) 416 return -EINVAL; 417 break; 418 #endif 419 default: 420 /* It is user using kernel to keep track of security 421 * associations for another protocol, such as 422 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 423 * lengths. 424 * 425 * XXX Actually, association/policy database is not yet 426 * XXX able to cope with arbitrary sockaddr families. 427 * XXX When it can, remove this -EINVAL. -DaveM 428 */ 429 return -EINVAL; 430 } 431 432 return 0; 433 } 434 435 static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 436 { 437 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 438 sec_ctx->sadb_x_ctx_len, 439 sizeof(uint64_t)); 440 } 441 442 static inline int verify_sec_ctx_len(const void *p) 443 { 444 const struct sadb_x_sec_ctx *sec_ctx = p; 445 int len = sec_ctx->sadb_x_ctx_len; 446 447 if (len > PAGE_SIZE) 448 return -EINVAL; 449 450 len = pfkey_sec_ctx_len(sec_ctx); 451 452 if (sec_ctx->sadb_x_sec_len != len) 453 return -EINVAL; 454 455 return 0; 456 } 457 458 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 459 gfp_t gfp) 460 { 461 struct xfrm_user_sec_ctx *uctx = NULL; 462 int ctx_size = sec_ctx->sadb_x_ctx_len; 463 464 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 465 466 if (!uctx) 467 return NULL; 468 469 uctx->len = pfkey_sec_ctx_len(sec_ctx); 470 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 471 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 472 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 473 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 474 memcpy(uctx + 1, sec_ctx + 1, 475 uctx->ctx_len); 476 477 return uctx; 478 } 479 480 static int present_and_same_family(const struct sadb_address *src, 481 const struct sadb_address *dst) 482 { 483 const struct sockaddr *s_addr, *d_addr; 484 485 if (!src || !dst) 486 return 0; 487 488 s_addr = (const struct sockaddr *)(src + 1); 489 d_addr = (const struct sockaddr *)(dst + 1); 490 if (s_addr->sa_family != d_addr->sa_family) 491 return 0; 492 if (s_addr->sa_family != AF_INET 493 #if IS_ENABLED(CONFIG_IPV6) 494 && s_addr->sa_family != AF_INET6 495 #endif 496 ) 497 return 0; 498 499 return 1; 500 } 501 502 static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 503 { 504 const char *p = (char *) hdr; 505 int len = skb->len; 506 507 len -= sizeof(*hdr); 508 p += sizeof(*hdr); 509 while (len > 0) { 510 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 511 uint16_t ext_type; 512 int ext_len; 513 514 ext_len = ehdr->sadb_ext_len; 515 ext_len *= sizeof(uint64_t); 516 ext_type = ehdr->sadb_ext_type; 517 if (ext_len < sizeof(uint64_t) || 518 ext_len > len || 519 ext_type == SADB_EXT_RESERVED) 520 return -EINVAL; 521 522 if (ext_type <= SADB_EXT_MAX) { 523 int min = (int) sadb_ext_min_len[ext_type]; 524 if (ext_len < min) 525 return -EINVAL; 526 if (ext_hdrs[ext_type-1] != NULL) 527 return -EINVAL; 528 if (ext_type == SADB_EXT_ADDRESS_SRC || 529 ext_type == SADB_EXT_ADDRESS_DST || 530 ext_type == SADB_EXT_ADDRESS_PROXY || 531 ext_type == SADB_X_EXT_NAT_T_OA) { 532 if (verify_address_len(p)) 533 return -EINVAL; 534 } 535 if (ext_type == SADB_X_EXT_SEC_CTX) { 536 if (verify_sec_ctx_len(p)) 537 return -EINVAL; 538 } 539 ext_hdrs[ext_type-1] = (void *) p; 540 } 541 p += ext_len; 542 len -= ext_len; 543 } 544 545 return 0; 546 } 547 548 static uint16_t 549 pfkey_satype2proto(uint8_t satype) 550 { 551 switch (satype) { 552 case SADB_SATYPE_UNSPEC: 553 return IPSEC_PROTO_ANY; 554 case SADB_SATYPE_AH: 555 return IPPROTO_AH; 556 case SADB_SATYPE_ESP: 557 return IPPROTO_ESP; 558 case SADB_X_SATYPE_IPCOMP: 559 return IPPROTO_COMP; 560 default: 561 return 0; 562 } 563 /* NOTREACHED */ 564 } 565 566 static uint8_t 567 pfkey_proto2satype(uint16_t proto) 568 { 569 switch (proto) { 570 case IPPROTO_AH: 571 return SADB_SATYPE_AH; 572 case IPPROTO_ESP: 573 return SADB_SATYPE_ESP; 574 case IPPROTO_COMP: 575 return SADB_X_SATYPE_IPCOMP; 576 default: 577 return 0; 578 } 579 /* NOTREACHED */ 580 } 581 582 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 583 * say specifically 'just raw sockets' as we encode them as 255. 584 */ 585 586 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 587 { 588 return proto == IPSEC_PROTO_ANY ? 0 : proto; 589 } 590 591 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 592 { 593 return proto ? proto : IPSEC_PROTO_ANY; 594 } 595 596 static inline int pfkey_sockaddr_len(sa_family_t family) 597 { 598 switch (family) { 599 case AF_INET: 600 return sizeof(struct sockaddr_in); 601 #if IS_ENABLED(CONFIG_IPV6) 602 case AF_INET6: 603 return sizeof(struct sockaddr_in6); 604 #endif 605 } 606 return 0; 607 } 608 609 static 610 int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 611 { 612 switch (sa->sa_family) { 613 case AF_INET: 614 xaddr->a4 = 615 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 616 return AF_INET; 617 #if IS_ENABLED(CONFIG_IPV6) 618 case AF_INET6: 619 memcpy(xaddr->a6, 620 &((struct sockaddr_in6 *)sa)->sin6_addr, 621 sizeof(struct in6_addr)); 622 return AF_INET6; 623 #endif 624 } 625 return 0; 626 } 627 628 static 629 int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 630 { 631 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 632 xaddr); 633 } 634 635 static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 636 { 637 const struct sadb_sa *sa; 638 const struct sadb_address *addr; 639 uint16_t proto; 640 unsigned short family; 641 xfrm_address_t *xaddr; 642 643 sa = ext_hdrs[SADB_EXT_SA - 1]; 644 if (sa == NULL) 645 return NULL; 646 647 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 648 if (proto == 0) 649 return NULL; 650 651 /* sadb_address_len should be checked by caller */ 652 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 653 if (addr == NULL) 654 return NULL; 655 656 family = ((const struct sockaddr *)(addr + 1))->sa_family; 657 switch (family) { 658 case AF_INET: 659 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 660 break; 661 #if IS_ENABLED(CONFIG_IPV6) 662 case AF_INET6: 663 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 664 break; 665 #endif 666 default: 667 xaddr = NULL; 668 } 669 670 if (!xaddr) 671 return NULL; 672 673 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 674 } 675 676 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 677 678 static int 679 pfkey_sockaddr_size(sa_family_t family) 680 { 681 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 682 } 683 684 static inline int pfkey_mode_from_xfrm(int mode) 685 { 686 switch(mode) { 687 case XFRM_MODE_TRANSPORT: 688 return IPSEC_MODE_TRANSPORT; 689 case XFRM_MODE_TUNNEL: 690 return IPSEC_MODE_TUNNEL; 691 case XFRM_MODE_BEET: 692 return IPSEC_MODE_BEET; 693 default: 694 return -1; 695 } 696 } 697 698 static inline int pfkey_mode_to_xfrm(int mode) 699 { 700 switch(mode) { 701 case IPSEC_MODE_ANY: /*XXX*/ 702 case IPSEC_MODE_TRANSPORT: 703 return XFRM_MODE_TRANSPORT; 704 case IPSEC_MODE_TUNNEL: 705 return XFRM_MODE_TUNNEL; 706 case IPSEC_MODE_BEET: 707 return XFRM_MODE_BEET; 708 default: 709 return -1; 710 } 711 } 712 713 static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 714 struct sockaddr *sa, 715 unsigned short family) 716 { 717 switch (family) { 718 case AF_INET: 719 { 720 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 721 sin->sin_family = AF_INET; 722 sin->sin_port = port; 723 sin->sin_addr.s_addr = xaddr->a4; 724 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 725 return 32; 726 } 727 #if IS_ENABLED(CONFIG_IPV6) 728 case AF_INET6: 729 { 730 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 731 sin6->sin6_family = AF_INET6; 732 sin6->sin6_port = port; 733 sin6->sin6_flowinfo = 0; 734 sin6->sin6_addr = xaddr->in6; 735 sin6->sin6_scope_id = 0; 736 return 128; 737 } 738 #endif 739 } 740 return 0; 741 } 742 743 static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 744 int add_keys, int hsc) 745 { 746 struct sk_buff *skb; 747 struct sadb_msg *hdr; 748 struct sadb_sa *sa; 749 struct sadb_lifetime *lifetime; 750 struct sadb_address *addr; 751 struct sadb_key *key; 752 struct sadb_x_sa2 *sa2; 753 struct sadb_x_sec_ctx *sec_ctx; 754 struct xfrm_sec_ctx *xfrm_ctx; 755 int ctx_size = 0; 756 int size; 757 int auth_key_size = 0; 758 int encrypt_key_size = 0; 759 int sockaddr_size; 760 struct xfrm_encap_tmpl *natt = NULL; 761 int mode; 762 763 /* address family check */ 764 sockaddr_size = pfkey_sockaddr_size(x->props.family); 765 if (!sockaddr_size) 766 return ERR_PTR(-EINVAL); 767 768 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 769 key(AE), (identity(SD),) (sensitivity)> */ 770 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 771 sizeof(struct sadb_lifetime) + 772 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 773 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 774 sizeof(struct sadb_address)*2 + 775 sockaddr_size*2 + 776 sizeof(struct sadb_x_sa2); 777 778 if ((xfrm_ctx = x->security)) { 779 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 780 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 781 } 782 783 /* identity & sensitivity */ 784 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 785 size += sizeof(struct sadb_address) + sockaddr_size; 786 787 if (add_keys) { 788 if (x->aalg && x->aalg->alg_key_len) { 789 auth_key_size = 790 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 791 size += sizeof(struct sadb_key) + auth_key_size; 792 } 793 if (x->ealg && x->ealg->alg_key_len) { 794 encrypt_key_size = 795 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 796 size += sizeof(struct sadb_key) + encrypt_key_size; 797 } 798 } 799 if (x->encap) 800 natt = x->encap; 801 802 if (natt && natt->encap_type) { 803 size += sizeof(struct sadb_x_nat_t_type); 804 size += sizeof(struct sadb_x_nat_t_port); 805 size += sizeof(struct sadb_x_nat_t_port); 806 } 807 808 skb = alloc_skb(size + 16, GFP_ATOMIC); 809 if (skb == NULL) 810 return ERR_PTR(-ENOBUFS); 811 812 /* call should fill header later */ 813 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 814 memset(hdr, 0, size); /* XXX do we need this ? */ 815 hdr->sadb_msg_len = size / sizeof(uint64_t); 816 817 /* sa */ 818 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 819 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 820 sa->sadb_sa_exttype = SADB_EXT_SA; 821 sa->sadb_sa_spi = x->id.spi; 822 sa->sadb_sa_replay = x->props.replay_window; 823 switch (x->km.state) { 824 case XFRM_STATE_VALID: 825 sa->sadb_sa_state = x->km.dying ? 826 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 827 break; 828 case XFRM_STATE_ACQ: 829 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 830 break; 831 default: 832 sa->sadb_sa_state = SADB_SASTATE_DEAD; 833 break; 834 } 835 sa->sadb_sa_auth = 0; 836 if (x->aalg) { 837 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 838 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 839 a->desc.sadb_alg_id : 0; 840 } 841 sa->sadb_sa_encrypt = 0; 842 BUG_ON(x->ealg && x->calg); 843 if (x->ealg) { 844 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 845 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 846 a->desc.sadb_alg_id : 0; 847 } 848 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 849 if (x->calg) { 850 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 851 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 852 a->desc.sadb_alg_id : 0; 853 } 854 855 sa->sadb_sa_flags = 0; 856 if (x->props.flags & XFRM_STATE_NOECN) 857 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 858 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 859 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 860 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 861 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 862 863 /* hard time */ 864 if (hsc & 2) { 865 lifetime = (struct sadb_lifetime *) skb_put(skb, 866 sizeof(struct sadb_lifetime)); 867 lifetime->sadb_lifetime_len = 868 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 869 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 870 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 871 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 872 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 873 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 874 } 875 /* soft time */ 876 if (hsc & 1) { 877 lifetime = (struct sadb_lifetime *) skb_put(skb, 878 sizeof(struct sadb_lifetime)); 879 lifetime->sadb_lifetime_len = 880 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 881 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 882 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 883 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 884 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 885 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 886 } 887 /* current time */ 888 lifetime = (struct sadb_lifetime *) skb_put(skb, 889 sizeof(struct sadb_lifetime)); 890 lifetime->sadb_lifetime_len = 891 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 892 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 893 lifetime->sadb_lifetime_allocations = x->curlft.packets; 894 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 895 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 896 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 897 /* src address */ 898 addr = (struct sadb_address*) skb_put(skb, 899 sizeof(struct sadb_address)+sockaddr_size); 900 addr->sadb_address_len = 901 (sizeof(struct sadb_address)+sockaddr_size)/ 902 sizeof(uint64_t); 903 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 904 /* "if the ports are non-zero, then the sadb_address_proto field, 905 normally zero, MUST be filled in with the transport 906 protocol's number." - RFC2367 */ 907 addr->sadb_address_proto = 0; 908 addr->sadb_address_reserved = 0; 909 910 addr->sadb_address_prefixlen = 911 pfkey_sockaddr_fill(&x->props.saddr, 0, 912 (struct sockaddr *) (addr + 1), 913 x->props.family); 914 if (!addr->sadb_address_prefixlen) 915 BUG(); 916 917 /* dst address */ 918 addr = (struct sadb_address*) skb_put(skb, 919 sizeof(struct sadb_address)+sockaddr_size); 920 addr->sadb_address_len = 921 (sizeof(struct sadb_address)+sockaddr_size)/ 922 sizeof(uint64_t); 923 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 924 addr->sadb_address_proto = 0; 925 addr->sadb_address_reserved = 0; 926 927 addr->sadb_address_prefixlen = 928 pfkey_sockaddr_fill(&x->id.daddr, 0, 929 (struct sockaddr *) (addr + 1), 930 x->props.family); 931 if (!addr->sadb_address_prefixlen) 932 BUG(); 933 934 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 935 x->props.family)) { 936 addr = (struct sadb_address*) skb_put(skb, 937 sizeof(struct sadb_address)+sockaddr_size); 938 addr->sadb_address_len = 939 (sizeof(struct sadb_address)+sockaddr_size)/ 940 sizeof(uint64_t); 941 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 942 addr->sadb_address_proto = 943 pfkey_proto_from_xfrm(x->sel.proto); 944 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 945 addr->sadb_address_reserved = 0; 946 947 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 948 (struct sockaddr *) (addr + 1), 949 x->props.family); 950 } 951 952 /* auth key */ 953 if (add_keys && auth_key_size) { 954 key = (struct sadb_key *) skb_put(skb, 955 sizeof(struct sadb_key)+auth_key_size); 956 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 957 sizeof(uint64_t); 958 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 959 key->sadb_key_bits = x->aalg->alg_key_len; 960 key->sadb_key_reserved = 0; 961 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 962 } 963 /* encrypt key */ 964 if (add_keys && encrypt_key_size) { 965 key = (struct sadb_key *) skb_put(skb, 966 sizeof(struct sadb_key)+encrypt_key_size); 967 key->sadb_key_len = (sizeof(struct sadb_key) + 968 encrypt_key_size) / sizeof(uint64_t); 969 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 970 key->sadb_key_bits = x->ealg->alg_key_len; 971 key->sadb_key_reserved = 0; 972 memcpy(key + 1, x->ealg->alg_key, 973 (x->ealg->alg_key_len+7)/8); 974 } 975 976 /* sa */ 977 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 978 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 979 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 980 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 981 kfree_skb(skb); 982 return ERR_PTR(-EINVAL); 983 } 984 sa2->sadb_x_sa2_mode = mode; 985 sa2->sadb_x_sa2_reserved1 = 0; 986 sa2->sadb_x_sa2_reserved2 = 0; 987 sa2->sadb_x_sa2_sequence = 0; 988 sa2->sadb_x_sa2_reqid = x->props.reqid; 989 990 if (natt && natt->encap_type) { 991 struct sadb_x_nat_t_type *n_type; 992 struct sadb_x_nat_t_port *n_port; 993 994 /* type */ 995 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 996 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 997 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 998 n_type->sadb_x_nat_t_type_type = natt->encap_type; 999 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1000 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1001 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1002 1003 /* source port */ 1004 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1005 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1006 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1007 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1008 n_port->sadb_x_nat_t_port_reserved = 0; 1009 1010 /* dest port */ 1011 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 1012 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1013 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1014 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1015 n_port->sadb_x_nat_t_port_reserved = 0; 1016 } 1017 1018 /* security context */ 1019 if (xfrm_ctx) { 1020 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 1021 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1022 sec_ctx->sadb_x_sec_len = 1023 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1024 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1025 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1026 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1027 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1028 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1029 xfrm_ctx->ctx_len); 1030 } 1031 1032 return skb; 1033 } 1034 1035 1036 static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1037 { 1038 struct sk_buff *skb; 1039 1040 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1041 1042 return skb; 1043 } 1044 1045 static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1046 int hsc) 1047 { 1048 return __pfkey_xfrm_state2msg(x, 0, hsc); 1049 } 1050 1051 static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1052 const struct sadb_msg *hdr, 1053 void * const *ext_hdrs) 1054 { 1055 struct xfrm_state *x; 1056 const struct sadb_lifetime *lifetime; 1057 const struct sadb_sa *sa; 1058 const struct sadb_key *key; 1059 const struct sadb_x_sec_ctx *sec_ctx; 1060 uint16_t proto; 1061 int err; 1062 1063 1064 sa = ext_hdrs[SADB_EXT_SA - 1]; 1065 if (!sa || 1066 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1067 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1068 return ERR_PTR(-EINVAL); 1069 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1070 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1071 return ERR_PTR(-EINVAL); 1072 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1073 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1074 return ERR_PTR(-EINVAL); 1075 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1076 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1077 return ERR_PTR(-EINVAL); 1078 1079 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1080 if (proto == 0) 1081 return ERR_PTR(-EINVAL); 1082 1083 /* default error is no buffer space */ 1084 err = -ENOBUFS; 1085 1086 /* RFC2367: 1087 1088 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1089 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1090 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1091 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1092 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1093 not true. 1094 1095 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1096 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1097 */ 1098 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1099 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1100 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1101 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1102 return ERR_PTR(-EINVAL); 1103 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1104 if (key != NULL && 1105 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1106 ((key->sadb_key_bits+7) / 8 == 0 || 1107 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1108 return ERR_PTR(-EINVAL); 1109 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1110 if (key != NULL && 1111 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1112 ((key->sadb_key_bits+7) / 8 == 0 || 1113 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1114 return ERR_PTR(-EINVAL); 1115 1116 x = xfrm_state_alloc(net); 1117 if (x == NULL) 1118 return ERR_PTR(-ENOBUFS); 1119 1120 x->id.proto = proto; 1121 x->id.spi = sa->sadb_sa_spi; 1122 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1123 (sizeof(x->replay.bitmap) * 8)); 1124 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1125 x->props.flags |= XFRM_STATE_NOECN; 1126 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1127 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1128 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1129 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1130 1131 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1132 if (lifetime != NULL) { 1133 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1134 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1135 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1136 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1137 } 1138 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1139 if (lifetime != NULL) { 1140 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1141 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1142 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1143 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1144 } 1145 1146 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1147 if (sec_ctx != NULL) { 1148 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1149 1150 if (!uctx) 1151 goto out; 1152 1153 err = security_xfrm_state_alloc(x, uctx); 1154 kfree(uctx); 1155 1156 if (err) 1157 goto out; 1158 } 1159 1160 err = -ENOBUFS; 1161 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1162 if (sa->sadb_sa_auth) { 1163 int keysize = 0; 1164 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1165 if (!a || !a->pfkey_supported) { 1166 err = -ENOSYS; 1167 goto out; 1168 } 1169 if (key) 1170 keysize = (key->sadb_key_bits + 7) / 8; 1171 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1172 if (!x->aalg) { 1173 err = -ENOMEM; 1174 goto out; 1175 } 1176 strcpy(x->aalg->alg_name, a->name); 1177 x->aalg->alg_key_len = 0; 1178 if (key) { 1179 x->aalg->alg_key_len = key->sadb_key_bits; 1180 memcpy(x->aalg->alg_key, key+1, keysize); 1181 } 1182 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1183 x->props.aalgo = sa->sadb_sa_auth; 1184 /* x->algo.flags = sa->sadb_sa_flags; */ 1185 } 1186 if (sa->sadb_sa_encrypt) { 1187 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1188 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1189 if (!a || !a->pfkey_supported) { 1190 err = -ENOSYS; 1191 goto out; 1192 } 1193 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1194 if (!x->calg) { 1195 err = -ENOMEM; 1196 goto out; 1197 } 1198 strcpy(x->calg->alg_name, a->name); 1199 x->props.calgo = sa->sadb_sa_encrypt; 1200 } else { 1201 int keysize = 0; 1202 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1203 if (!a || !a->pfkey_supported) { 1204 err = -ENOSYS; 1205 goto out; 1206 } 1207 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1208 if (key) 1209 keysize = (key->sadb_key_bits + 7) / 8; 1210 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1211 if (!x->ealg) { 1212 err = -ENOMEM; 1213 goto out; 1214 } 1215 strcpy(x->ealg->alg_name, a->name); 1216 x->ealg->alg_key_len = 0; 1217 if (key) { 1218 x->ealg->alg_key_len = key->sadb_key_bits; 1219 memcpy(x->ealg->alg_key, key+1, keysize); 1220 } 1221 x->props.ealgo = sa->sadb_sa_encrypt; 1222 x->geniv = a->uinfo.encr.geniv; 1223 } 1224 } 1225 /* x->algo.flags = sa->sadb_sa_flags; */ 1226 1227 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1228 &x->props.saddr); 1229 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1230 &x->id.daddr); 1231 1232 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1233 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1234 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1235 if (mode < 0) { 1236 err = -EINVAL; 1237 goto out; 1238 } 1239 x->props.mode = mode; 1240 x->props.reqid = sa2->sadb_x_sa2_reqid; 1241 } 1242 1243 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1244 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1245 1246 /* Nobody uses this, but we try. */ 1247 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1248 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1249 } 1250 1251 if (!x->sel.family) 1252 x->sel.family = x->props.family; 1253 1254 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1255 const struct sadb_x_nat_t_type* n_type; 1256 struct xfrm_encap_tmpl *natt; 1257 1258 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1259 if (!x->encap) { 1260 err = -ENOMEM; 1261 goto out; 1262 } 1263 1264 natt = x->encap; 1265 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1266 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1267 1268 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1269 const struct sadb_x_nat_t_port *n_port = 1270 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1271 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1272 } 1273 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1274 const struct sadb_x_nat_t_port *n_port = 1275 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1276 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1277 } 1278 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1279 } 1280 1281 err = xfrm_init_state(x); 1282 if (err) 1283 goto out; 1284 1285 x->km.seq = hdr->sadb_msg_seq; 1286 return x; 1287 1288 out: 1289 x->km.state = XFRM_STATE_DEAD; 1290 xfrm_state_put(x); 1291 return ERR_PTR(err); 1292 } 1293 1294 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1295 { 1296 return -EOPNOTSUPP; 1297 } 1298 1299 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1300 { 1301 struct net *net = sock_net(sk); 1302 struct sk_buff *resp_skb; 1303 struct sadb_x_sa2 *sa2; 1304 struct sadb_address *saddr, *daddr; 1305 struct sadb_msg *out_hdr; 1306 struct sadb_spirange *range; 1307 struct xfrm_state *x = NULL; 1308 int mode; 1309 int err; 1310 u32 min_spi, max_spi; 1311 u32 reqid; 1312 u8 proto; 1313 unsigned short family; 1314 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1315 1316 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1317 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1318 return -EINVAL; 1319 1320 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1321 if (proto == 0) 1322 return -EINVAL; 1323 1324 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1325 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1326 if (mode < 0) 1327 return -EINVAL; 1328 reqid = sa2->sadb_x_sa2_reqid; 1329 } else { 1330 mode = 0; 1331 reqid = 0; 1332 } 1333 1334 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1335 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1336 1337 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1338 switch (family) { 1339 case AF_INET: 1340 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1341 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1342 break; 1343 #if IS_ENABLED(CONFIG_IPV6) 1344 case AF_INET6: 1345 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1346 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1347 break; 1348 #endif 1349 } 1350 1351 if (hdr->sadb_msg_seq) { 1352 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1353 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1354 xfrm_state_put(x); 1355 x = NULL; 1356 } 1357 } 1358 1359 if (!x) 1360 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1361 1362 if (x == NULL) 1363 return -ENOENT; 1364 1365 min_spi = 0x100; 1366 max_spi = 0x0fffffff; 1367 1368 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1369 if (range) { 1370 min_spi = range->sadb_spirange_min; 1371 max_spi = range->sadb_spirange_max; 1372 } 1373 1374 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1375 if (err) { 1376 xfrm_state_put(x); 1377 return err; 1378 } 1379 1380 err = xfrm_alloc_spi(x, min_spi, max_spi); 1381 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1382 1383 if (IS_ERR(resp_skb)) { 1384 xfrm_state_put(x); 1385 return PTR_ERR(resp_skb); 1386 } 1387 1388 out_hdr = (struct sadb_msg *) resp_skb->data; 1389 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1390 out_hdr->sadb_msg_type = SADB_GETSPI; 1391 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1392 out_hdr->sadb_msg_errno = 0; 1393 out_hdr->sadb_msg_reserved = 0; 1394 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1395 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1396 1397 xfrm_state_put(x); 1398 1399 pfkey_broadcast(resp_skb, BROADCAST_ONE, sk, net); 1400 1401 return 0; 1402 } 1403 1404 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1405 { 1406 struct net *net = sock_net(sk); 1407 struct xfrm_state *x; 1408 1409 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1410 return -EOPNOTSUPP; 1411 1412 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1413 return 0; 1414 1415 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1416 if (x == NULL) 1417 return 0; 1418 1419 spin_lock_bh(&x->lock); 1420 if (x->km.state == XFRM_STATE_ACQ) 1421 x->km.state = XFRM_STATE_ERROR; 1422 1423 spin_unlock_bh(&x->lock); 1424 xfrm_state_put(x); 1425 return 0; 1426 } 1427 1428 static inline int event2poltype(int event) 1429 { 1430 switch (event) { 1431 case XFRM_MSG_DELPOLICY: 1432 return SADB_X_SPDDELETE; 1433 case XFRM_MSG_NEWPOLICY: 1434 return SADB_X_SPDADD; 1435 case XFRM_MSG_UPDPOLICY: 1436 return SADB_X_SPDUPDATE; 1437 case XFRM_MSG_POLEXPIRE: 1438 // return SADB_X_SPDEXPIRE; 1439 default: 1440 pr_err("pfkey: Unknown policy event %d\n", event); 1441 break; 1442 } 1443 1444 return 0; 1445 } 1446 1447 static inline int event2keytype(int event) 1448 { 1449 switch (event) { 1450 case XFRM_MSG_DELSA: 1451 return SADB_DELETE; 1452 case XFRM_MSG_NEWSA: 1453 return SADB_ADD; 1454 case XFRM_MSG_UPDSA: 1455 return SADB_UPDATE; 1456 case XFRM_MSG_EXPIRE: 1457 return SADB_EXPIRE; 1458 default: 1459 pr_err("pfkey: Unknown SA event %d\n", event); 1460 break; 1461 } 1462 1463 return 0; 1464 } 1465 1466 /* ADD/UPD/DEL */ 1467 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1468 { 1469 struct sk_buff *skb; 1470 struct sadb_msg *hdr; 1471 1472 skb = pfkey_xfrm_state2msg(x); 1473 1474 if (IS_ERR(skb)) 1475 return PTR_ERR(skb); 1476 1477 hdr = (struct sadb_msg *) skb->data; 1478 hdr->sadb_msg_version = PF_KEY_V2; 1479 hdr->sadb_msg_type = event2keytype(c->event); 1480 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1481 hdr->sadb_msg_errno = 0; 1482 hdr->sadb_msg_reserved = 0; 1483 hdr->sadb_msg_seq = c->seq; 1484 hdr->sadb_msg_pid = c->portid; 1485 1486 pfkey_broadcast(skb, BROADCAST_ALL, NULL, xs_net(x)); 1487 1488 return 0; 1489 } 1490 1491 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1492 { 1493 struct net *net = sock_net(sk); 1494 struct xfrm_state *x; 1495 int err; 1496 struct km_event c; 1497 1498 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1499 if (IS_ERR(x)) 1500 return PTR_ERR(x); 1501 1502 xfrm_state_hold(x); 1503 if (hdr->sadb_msg_type == SADB_ADD) 1504 err = xfrm_state_add(x); 1505 else 1506 err = xfrm_state_update(x); 1507 1508 xfrm_audit_state_add(x, err ? 0 : 1, true); 1509 1510 if (err < 0) { 1511 x->km.state = XFRM_STATE_DEAD; 1512 __xfrm_state_put(x); 1513 goto out; 1514 } 1515 1516 if (hdr->sadb_msg_type == SADB_ADD) 1517 c.event = XFRM_MSG_NEWSA; 1518 else 1519 c.event = XFRM_MSG_UPDSA; 1520 c.seq = hdr->sadb_msg_seq; 1521 c.portid = hdr->sadb_msg_pid; 1522 km_state_notify(x, &c); 1523 out: 1524 xfrm_state_put(x); 1525 return err; 1526 } 1527 1528 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1529 { 1530 struct net *net = sock_net(sk); 1531 struct xfrm_state *x; 1532 struct km_event c; 1533 int err; 1534 1535 if (!ext_hdrs[SADB_EXT_SA-1] || 1536 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1537 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1538 return -EINVAL; 1539 1540 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1541 if (x == NULL) 1542 return -ESRCH; 1543 1544 if ((err = security_xfrm_state_delete(x))) 1545 goto out; 1546 1547 if (xfrm_state_kern(x)) { 1548 err = -EPERM; 1549 goto out; 1550 } 1551 1552 err = xfrm_state_delete(x); 1553 1554 if (err < 0) 1555 goto out; 1556 1557 c.seq = hdr->sadb_msg_seq; 1558 c.portid = hdr->sadb_msg_pid; 1559 c.event = XFRM_MSG_DELSA; 1560 km_state_notify(x, &c); 1561 out: 1562 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1563 xfrm_state_put(x); 1564 1565 return err; 1566 } 1567 1568 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1569 { 1570 struct net *net = sock_net(sk); 1571 __u8 proto; 1572 struct sk_buff *out_skb; 1573 struct sadb_msg *out_hdr; 1574 struct xfrm_state *x; 1575 1576 if (!ext_hdrs[SADB_EXT_SA-1] || 1577 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1578 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1579 return -EINVAL; 1580 1581 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1582 if (x == NULL) 1583 return -ESRCH; 1584 1585 out_skb = pfkey_xfrm_state2msg(x); 1586 proto = x->id.proto; 1587 xfrm_state_put(x); 1588 if (IS_ERR(out_skb)) 1589 return PTR_ERR(out_skb); 1590 1591 out_hdr = (struct sadb_msg *) out_skb->data; 1592 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1593 out_hdr->sadb_msg_type = SADB_GET; 1594 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1595 out_hdr->sadb_msg_errno = 0; 1596 out_hdr->sadb_msg_reserved = 0; 1597 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1598 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1599 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, sock_net(sk)); 1600 1601 return 0; 1602 } 1603 1604 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1605 gfp_t allocation) 1606 { 1607 struct sk_buff *skb; 1608 struct sadb_msg *hdr; 1609 int len, auth_len, enc_len, i; 1610 1611 auth_len = xfrm_count_pfkey_auth_supported(); 1612 if (auth_len) { 1613 auth_len *= sizeof(struct sadb_alg); 1614 auth_len += sizeof(struct sadb_supported); 1615 } 1616 1617 enc_len = xfrm_count_pfkey_enc_supported(); 1618 if (enc_len) { 1619 enc_len *= sizeof(struct sadb_alg); 1620 enc_len += sizeof(struct sadb_supported); 1621 } 1622 1623 len = enc_len + auth_len + sizeof(struct sadb_msg); 1624 1625 skb = alloc_skb(len + 16, allocation); 1626 if (!skb) 1627 goto out_put_algs; 1628 1629 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1630 pfkey_hdr_dup(hdr, orig); 1631 hdr->sadb_msg_errno = 0; 1632 hdr->sadb_msg_len = len / sizeof(uint64_t); 1633 1634 if (auth_len) { 1635 struct sadb_supported *sp; 1636 struct sadb_alg *ap; 1637 1638 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1639 ap = (struct sadb_alg *) (sp + 1); 1640 1641 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1642 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1643 1644 for (i = 0; ; i++) { 1645 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1646 if (!aalg) 1647 break; 1648 if (!aalg->pfkey_supported) 1649 continue; 1650 if (aalg->available) 1651 *ap++ = aalg->desc; 1652 } 1653 } 1654 1655 if (enc_len) { 1656 struct sadb_supported *sp; 1657 struct sadb_alg *ap; 1658 1659 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1660 ap = (struct sadb_alg *) (sp + 1); 1661 1662 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1663 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1664 1665 for (i = 0; ; i++) { 1666 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1667 if (!ealg) 1668 break; 1669 if (!ealg->pfkey_supported) 1670 continue; 1671 if (ealg->available) 1672 *ap++ = ealg->desc; 1673 } 1674 } 1675 1676 out_put_algs: 1677 return skb; 1678 } 1679 1680 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1681 { 1682 struct pfkey_sock *pfk = pfkey_sk(sk); 1683 struct sk_buff *supp_skb; 1684 1685 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1686 return -EINVAL; 1687 1688 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1689 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1690 return -EEXIST; 1691 pfk->registered |= (1<<hdr->sadb_msg_satype); 1692 } 1693 1694 xfrm_probe_algs(); 1695 1696 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1697 if (!supp_skb) { 1698 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1699 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1700 1701 return -ENOBUFS; 1702 } 1703 1704 pfkey_broadcast(supp_skb, BROADCAST_REGISTERED, sk, sock_net(sk)); 1705 1706 return 0; 1707 } 1708 1709 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1710 { 1711 struct sk_buff *skb; 1712 struct sadb_msg *hdr; 1713 1714 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1715 if (!skb) 1716 return -ENOBUFS; 1717 1718 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1719 memcpy(hdr, ihdr, sizeof(struct sadb_msg)); 1720 hdr->sadb_msg_errno = (uint8_t) 0; 1721 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1722 1723 return pfkey_broadcast(skb, BROADCAST_ONE, sk, sock_net(sk)); 1724 } 1725 1726 static int key_notify_sa_flush(const struct km_event *c) 1727 { 1728 struct sk_buff *skb; 1729 struct sadb_msg *hdr; 1730 1731 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1732 if (!skb) 1733 return -ENOBUFS; 1734 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1735 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1736 hdr->sadb_msg_type = SADB_FLUSH; 1737 hdr->sadb_msg_seq = c->seq; 1738 hdr->sadb_msg_pid = c->portid; 1739 hdr->sadb_msg_version = PF_KEY_V2; 1740 hdr->sadb_msg_errno = (uint8_t) 0; 1741 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1742 hdr->sadb_msg_reserved = 0; 1743 1744 pfkey_broadcast(skb, BROADCAST_ALL, NULL, c->net); 1745 1746 return 0; 1747 } 1748 1749 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1750 { 1751 struct net *net = sock_net(sk); 1752 unsigned int proto; 1753 struct km_event c; 1754 int err, err2; 1755 1756 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1757 if (proto == 0) 1758 return -EINVAL; 1759 1760 err = xfrm_state_flush(net, proto, true); 1761 err2 = unicast_flush_resp(sk, hdr); 1762 if (err || err2) { 1763 if (err == -ESRCH) /* empty table - go quietly */ 1764 err = 0; 1765 return err ? err : err2; 1766 } 1767 1768 c.data.proto = proto; 1769 c.seq = hdr->sadb_msg_seq; 1770 c.portid = hdr->sadb_msg_pid; 1771 c.event = XFRM_MSG_FLUSHSA; 1772 c.net = net; 1773 km_state_notify(NULL, &c); 1774 1775 return 0; 1776 } 1777 1778 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1779 { 1780 struct pfkey_sock *pfk = ptr; 1781 struct sk_buff *out_skb; 1782 struct sadb_msg *out_hdr; 1783 1784 if (!pfkey_can_dump(&pfk->sk)) 1785 return -ENOBUFS; 1786 1787 out_skb = pfkey_xfrm_state2msg(x); 1788 if (IS_ERR(out_skb)) 1789 return PTR_ERR(out_skb); 1790 1791 out_hdr = (struct sadb_msg *) out_skb->data; 1792 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1793 out_hdr->sadb_msg_type = SADB_DUMP; 1794 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1795 out_hdr->sadb_msg_errno = 0; 1796 out_hdr->sadb_msg_reserved = 0; 1797 out_hdr->sadb_msg_seq = count + 1; 1798 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1799 1800 if (pfk->dump.skb) 1801 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE, 1802 &pfk->sk, sock_net(&pfk->sk)); 1803 pfk->dump.skb = out_skb; 1804 1805 return 0; 1806 } 1807 1808 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1809 { 1810 struct net *net = sock_net(&pfk->sk); 1811 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1812 } 1813 1814 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1815 { 1816 struct net *net = sock_net(&pfk->sk); 1817 1818 xfrm_state_walk_done(&pfk->dump.u.state, net); 1819 } 1820 1821 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1822 { 1823 u8 proto; 1824 struct xfrm_address_filter *filter = NULL; 1825 struct pfkey_sock *pfk = pfkey_sk(sk); 1826 1827 mutex_lock(&pfk->dump_lock); 1828 if (pfk->dump.dump != NULL) { 1829 mutex_unlock(&pfk->dump_lock); 1830 return -EBUSY; 1831 } 1832 1833 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1834 if (proto == 0) { 1835 mutex_unlock(&pfk->dump_lock); 1836 return -EINVAL; 1837 } 1838 1839 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1840 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1841 1842 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1843 if (filter == NULL) { 1844 mutex_unlock(&pfk->dump_lock); 1845 return -ENOMEM; 1846 } 1847 1848 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1849 sizeof(xfrm_address_t)); 1850 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1851 sizeof(xfrm_address_t)); 1852 filter->family = xfilter->sadb_x_filter_family; 1853 filter->splen = xfilter->sadb_x_filter_splen; 1854 filter->dplen = xfilter->sadb_x_filter_dplen; 1855 } 1856 1857 pfk->dump.msg_version = hdr->sadb_msg_version; 1858 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1859 pfk->dump.dump = pfkey_dump_sa; 1860 pfk->dump.done = pfkey_dump_sa_done; 1861 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1862 mutex_unlock(&pfk->dump_lock); 1863 1864 return pfkey_do_dump(pfk); 1865 } 1866 1867 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1868 { 1869 struct pfkey_sock *pfk = pfkey_sk(sk); 1870 int satype = hdr->sadb_msg_satype; 1871 bool reset_errno = false; 1872 1873 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1874 reset_errno = true; 1875 if (satype != 0 && satype != 1) 1876 return -EINVAL; 1877 pfk->promisc = satype; 1878 } 1879 if (reset_errno && skb_cloned(skb)) 1880 skb = skb_copy(skb, GFP_KERNEL); 1881 else 1882 skb = skb_clone(skb, GFP_KERNEL); 1883 1884 if (reset_errno && skb) { 1885 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1886 new_hdr->sadb_msg_errno = 0; 1887 } 1888 1889 pfkey_broadcast(skb, BROADCAST_ALL, NULL, sock_net(sk)); 1890 return 0; 1891 } 1892 1893 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1894 { 1895 int i; 1896 u32 reqid = *(u32*)ptr; 1897 1898 for (i=0; i<xp->xfrm_nr; i++) { 1899 if (xp->xfrm_vec[i].reqid == reqid) 1900 return -EEXIST; 1901 } 1902 return 0; 1903 } 1904 1905 static u32 gen_reqid(struct net *net) 1906 { 1907 struct xfrm_policy_walk walk; 1908 u32 start; 1909 int rc; 1910 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1911 1912 start = reqid; 1913 do { 1914 ++reqid; 1915 if (reqid == 0) 1916 reqid = IPSEC_MANUAL_REQID_MAX+1; 1917 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1918 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1919 xfrm_policy_walk_done(&walk, net); 1920 if (rc != -EEXIST) 1921 return reqid; 1922 } while (reqid != start); 1923 return 0; 1924 } 1925 1926 static int 1927 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1928 { 1929 struct net *net = xp_net(xp); 1930 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1931 int mode; 1932 1933 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1934 return -ELOOP; 1935 1936 if (rq->sadb_x_ipsecrequest_mode == 0) 1937 return -EINVAL; 1938 1939 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1940 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1941 return -EINVAL; 1942 t->mode = mode; 1943 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1944 t->optional = 1; 1945 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1946 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1947 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1948 t->reqid = 0; 1949 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1950 return -ENOBUFS; 1951 } 1952 1953 /* addresses present only in tunnel mode */ 1954 if (t->mode == XFRM_MODE_TUNNEL) { 1955 int err; 1956 1957 err = parse_sockaddr_pair( 1958 (struct sockaddr *)(rq + 1), 1959 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1960 &t->saddr, &t->id.daddr, &t->encap_family); 1961 if (err) 1962 return err; 1963 } else 1964 t->encap_family = xp->family; 1965 1966 /* No way to set this via kame pfkey */ 1967 t->allalgs = 1; 1968 xp->xfrm_nr++; 1969 return 0; 1970 } 1971 1972 static int 1973 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1974 { 1975 int err; 1976 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1977 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1978 1979 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1980 return -EINVAL; 1981 1982 while (len >= sizeof(*rq)) { 1983 if (len < rq->sadb_x_ipsecrequest_len || 1984 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 1985 return -EINVAL; 1986 1987 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1988 return err; 1989 len -= rq->sadb_x_ipsecrequest_len; 1990 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1991 } 1992 return 0; 1993 } 1994 1995 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1996 { 1997 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1998 1999 if (xfrm_ctx) { 2000 int len = sizeof(struct sadb_x_sec_ctx); 2001 len += xfrm_ctx->ctx_len; 2002 return PFKEY_ALIGN8(len); 2003 } 2004 return 0; 2005 } 2006 2007 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2008 { 2009 const struct xfrm_tmpl *t; 2010 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2011 int socklen = 0; 2012 int i; 2013 2014 for (i=0; i<xp->xfrm_nr; i++) { 2015 t = xp->xfrm_vec + i; 2016 socklen += pfkey_sockaddr_len(t->encap_family); 2017 } 2018 2019 return sizeof(struct sadb_msg) + 2020 (sizeof(struct sadb_lifetime) * 3) + 2021 (sizeof(struct sadb_address) * 2) + 2022 (sockaddr_size * 2) + 2023 sizeof(struct sadb_x_policy) + 2024 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2025 (socklen * 2) + 2026 pfkey_xfrm_policy2sec_ctx_size(xp); 2027 } 2028 2029 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2030 { 2031 struct sk_buff *skb; 2032 int size; 2033 2034 size = pfkey_xfrm_policy2msg_size(xp); 2035 2036 skb = alloc_skb(size + 16, GFP_ATOMIC); 2037 if (skb == NULL) 2038 return ERR_PTR(-ENOBUFS); 2039 2040 return skb; 2041 } 2042 2043 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2044 { 2045 struct sadb_msg *hdr; 2046 struct sadb_address *addr; 2047 struct sadb_lifetime *lifetime; 2048 struct sadb_x_policy *pol; 2049 struct sadb_x_sec_ctx *sec_ctx; 2050 struct xfrm_sec_ctx *xfrm_ctx; 2051 int i; 2052 int size; 2053 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2054 int socklen = pfkey_sockaddr_len(xp->family); 2055 2056 size = pfkey_xfrm_policy2msg_size(xp); 2057 2058 /* call should fill header later */ 2059 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2060 memset(hdr, 0, size); /* XXX do we need this ? */ 2061 2062 /* src address */ 2063 addr = (struct sadb_address*) skb_put(skb, 2064 sizeof(struct sadb_address)+sockaddr_size); 2065 addr->sadb_address_len = 2066 (sizeof(struct sadb_address)+sockaddr_size)/ 2067 sizeof(uint64_t); 2068 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2069 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2070 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2071 addr->sadb_address_reserved = 0; 2072 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2073 xp->selector.sport, 2074 (struct sockaddr *) (addr + 1), 2075 xp->family)) 2076 BUG(); 2077 2078 /* dst address */ 2079 addr = (struct sadb_address*) skb_put(skb, 2080 sizeof(struct sadb_address)+sockaddr_size); 2081 addr->sadb_address_len = 2082 (sizeof(struct sadb_address)+sockaddr_size)/ 2083 sizeof(uint64_t); 2084 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2085 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2086 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2087 addr->sadb_address_reserved = 0; 2088 2089 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2090 (struct sockaddr *) (addr + 1), 2091 xp->family); 2092 2093 /* hard time */ 2094 lifetime = (struct sadb_lifetime *) skb_put(skb, 2095 sizeof(struct sadb_lifetime)); 2096 lifetime->sadb_lifetime_len = 2097 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2098 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2099 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2100 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2101 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2102 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2103 /* soft time */ 2104 lifetime = (struct sadb_lifetime *) skb_put(skb, 2105 sizeof(struct sadb_lifetime)); 2106 lifetime->sadb_lifetime_len = 2107 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2108 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2109 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2110 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2111 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2112 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2113 /* current time */ 2114 lifetime = (struct sadb_lifetime *) skb_put(skb, 2115 sizeof(struct sadb_lifetime)); 2116 lifetime->sadb_lifetime_len = 2117 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2118 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2119 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2120 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2121 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2122 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2123 2124 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2125 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2126 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2127 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2128 if (xp->action == XFRM_POLICY_ALLOW) { 2129 if (xp->xfrm_nr) 2130 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2131 else 2132 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2133 } 2134 pol->sadb_x_policy_dir = dir+1; 2135 pol->sadb_x_policy_reserved = 0; 2136 pol->sadb_x_policy_id = xp->index; 2137 pol->sadb_x_policy_priority = xp->priority; 2138 2139 for (i=0; i<xp->xfrm_nr; i++) { 2140 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2141 struct sadb_x_ipsecrequest *rq; 2142 int req_size; 2143 int mode; 2144 2145 req_size = sizeof(struct sadb_x_ipsecrequest); 2146 if (t->mode == XFRM_MODE_TUNNEL) { 2147 socklen = pfkey_sockaddr_len(t->encap_family); 2148 req_size += socklen * 2; 2149 } else { 2150 size -= 2*socklen; 2151 } 2152 rq = (void*)skb_put(skb, req_size); 2153 pol->sadb_x_policy_len += req_size/8; 2154 memset(rq, 0, sizeof(*rq)); 2155 rq->sadb_x_ipsecrequest_len = req_size; 2156 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2157 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2158 return -EINVAL; 2159 rq->sadb_x_ipsecrequest_mode = mode; 2160 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2161 if (t->reqid) 2162 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2163 if (t->optional) 2164 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2165 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2166 2167 if (t->mode == XFRM_MODE_TUNNEL) { 2168 u8 *sa = (void *)(rq + 1); 2169 pfkey_sockaddr_fill(&t->saddr, 0, 2170 (struct sockaddr *)sa, 2171 t->encap_family); 2172 pfkey_sockaddr_fill(&t->id.daddr, 0, 2173 (struct sockaddr *) (sa + socklen), 2174 t->encap_family); 2175 } 2176 } 2177 2178 /* security context */ 2179 if ((xfrm_ctx = xp->security)) { 2180 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2181 2182 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2183 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2184 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2185 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2186 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2187 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2188 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2189 xfrm_ctx->ctx_len); 2190 } 2191 2192 hdr->sadb_msg_len = size / sizeof(uint64_t); 2193 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2194 2195 return 0; 2196 } 2197 2198 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2199 { 2200 struct sk_buff *out_skb; 2201 struct sadb_msg *out_hdr; 2202 int err; 2203 2204 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2205 if (IS_ERR(out_skb)) 2206 return PTR_ERR(out_skb); 2207 2208 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2209 if (err < 0) 2210 return err; 2211 2212 out_hdr = (struct sadb_msg *) out_skb->data; 2213 out_hdr->sadb_msg_version = PF_KEY_V2; 2214 2215 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2216 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2217 else 2218 out_hdr->sadb_msg_type = event2poltype(c->event); 2219 out_hdr->sadb_msg_errno = 0; 2220 out_hdr->sadb_msg_seq = c->seq; 2221 out_hdr->sadb_msg_pid = c->portid; 2222 pfkey_broadcast(out_skb, BROADCAST_ALL, NULL, xp_net(xp)); 2223 return 0; 2224 2225 } 2226 2227 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2228 { 2229 struct net *net = sock_net(sk); 2230 int err = 0; 2231 struct sadb_lifetime *lifetime; 2232 struct sadb_address *sa; 2233 struct sadb_x_policy *pol; 2234 struct xfrm_policy *xp; 2235 struct km_event c; 2236 struct sadb_x_sec_ctx *sec_ctx; 2237 2238 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2239 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2240 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2241 return -EINVAL; 2242 2243 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2244 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2245 return -EINVAL; 2246 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2247 return -EINVAL; 2248 2249 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2250 if (xp == NULL) 2251 return -ENOBUFS; 2252 2253 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2254 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2255 xp->priority = pol->sadb_x_policy_priority; 2256 2257 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2258 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2259 xp->selector.family = xp->family; 2260 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2261 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2262 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2263 if (xp->selector.sport) 2264 xp->selector.sport_mask = htons(0xffff); 2265 2266 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2267 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2268 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2269 2270 /* Amusing, we set this twice. KAME apps appear to set same value 2271 * in both addresses. 2272 */ 2273 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2274 2275 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2276 if (xp->selector.dport) 2277 xp->selector.dport_mask = htons(0xffff); 2278 2279 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2280 if (sec_ctx != NULL) { 2281 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2282 2283 if (!uctx) { 2284 err = -ENOBUFS; 2285 goto out; 2286 } 2287 2288 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2289 kfree(uctx); 2290 2291 if (err) 2292 goto out; 2293 } 2294 2295 xp->lft.soft_byte_limit = XFRM_INF; 2296 xp->lft.hard_byte_limit = XFRM_INF; 2297 xp->lft.soft_packet_limit = XFRM_INF; 2298 xp->lft.hard_packet_limit = XFRM_INF; 2299 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2300 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2301 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2302 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2303 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2304 } 2305 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2306 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2307 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2308 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2309 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2310 } 2311 xp->xfrm_nr = 0; 2312 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2313 (err = parse_ipsecrequests(xp, pol)) < 0) 2314 goto out; 2315 2316 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2317 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2318 2319 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2320 2321 if (err) 2322 goto out; 2323 2324 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2325 c.event = XFRM_MSG_UPDPOLICY; 2326 else 2327 c.event = XFRM_MSG_NEWPOLICY; 2328 2329 c.seq = hdr->sadb_msg_seq; 2330 c.portid = hdr->sadb_msg_pid; 2331 2332 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2333 xfrm_pol_put(xp); 2334 return 0; 2335 2336 out: 2337 xp->walk.dead = 1; 2338 xfrm_policy_destroy(xp); 2339 return err; 2340 } 2341 2342 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2343 { 2344 struct net *net = sock_net(sk); 2345 int err; 2346 struct sadb_address *sa; 2347 struct sadb_x_policy *pol; 2348 struct xfrm_policy *xp; 2349 struct xfrm_selector sel; 2350 struct km_event c; 2351 struct sadb_x_sec_ctx *sec_ctx; 2352 struct xfrm_sec_ctx *pol_ctx = NULL; 2353 2354 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2355 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2356 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2357 return -EINVAL; 2358 2359 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2360 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2361 return -EINVAL; 2362 2363 memset(&sel, 0, sizeof(sel)); 2364 2365 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2366 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2367 sel.prefixlen_s = sa->sadb_address_prefixlen; 2368 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2369 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2370 if (sel.sport) 2371 sel.sport_mask = htons(0xffff); 2372 2373 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2374 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2375 sel.prefixlen_d = sa->sadb_address_prefixlen; 2376 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2377 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2378 if (sel.dport) 2379 sel.dport_mask = htons(0xffff); 2380 2381 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2382 if (sec_ctx != NULL) { 2383 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2384 2385 if (!uctx) 2386 return -ENOMEM; 2387 2388 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2389 kfree(uctx); 2390 if (err) 2391 return err; 2392 } 2393 2394 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2395 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2396 1, &err); 2397 security_xfrm_policy_free(pol_ctx); 2398 if (xp == NULL) 2399 return -ENOENT; 2400 2401 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2402 2403 if (err) 2404 goto out; 2405 2406 c.seq = hdr->sadb_msg_seq; 2407 c.portid = hdr->sadb_msg_pid; 2408 c.data.byid = 0; 2409 c.event = XFRM_MSG_DELPOLICY; 2410 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2411 2412 out: 2413 xfrm_pol_put(xp); 2414 if (err == 0) 2415 xfrm_garbage_collect(net); 2416 return err; 2417 } 2418 2419 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2420 { 2421 int err; 2422 struct sk_buff *out_skb; 2423 struct sadb_msg *out_hdr; 2424 err = 0; 2425 2426 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2427 if (IS_ERR(out_skb)) { 2428 err = PTR_ERR(out_skb); 2429 goto out; 2430 } 2431 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2432 if (err < 0) 2433 goto out; 2434 2435 out_hdr = (struct sadb_msg *) out_skb->data; 2436 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2437 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2438 out_hdr->sadb_msg_satype = 0; 2439 out_hdr->sadb_msg_errno = 0; 2440 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2441 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2442 pfkey_broadcast(out_skb, BROADCAST_ONE, sk, xp_net(xp)); 2443 err = 0; 2444 2445 out: 2446 return err; 2447 } 2448 2449 static int pfkey_sockaddr_pair_size(sa_family_t family) 2450 { 2451 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2452 } 2453 2454 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2455 xfrm_address_t *saddr, xfrm_address_t *daddr, 2456 u16 *family) 2457 { 2458 int af, socklen; 2459 2460 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2461 return -EINVAL; 2462 2463 af = pfkey_sockaddr_extract(sa, saddr); 2464 if (!af) 2465 return -EINVAL; 2466 2467 socklen = pfkey_sockaddr_len(af); 2468 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2469 daddr) != af) 2470 return -EINVAL; 2471 2472 *family = af; 2473 return 0; 2474 } 2475 2476 #ifdef CONFIG_NET_KEY_MIGRATE 2477 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2478 struct xfrm_migrate *m) 2479 { 2480 int err; 2481 struct sadb_x_ipsecrequest *rq2; 2482 int mode; 2483 2484 if (len < sizeof(*rq1) || 2485 len < rq1->sadb_x_ipsecrequest_len || 2486 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2487 return -EINVAL; 2488 2489 /* old endoints */ 2490 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2491 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2492 &m->old_saddr, &m->old_daddr, 2493 &m->old_family); 2494 if (err) 2495 return err; 2496 2497 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2498 len -= rq1->sadb_x_ipsecrequest_len; 2499 2500 if (len <= sizeof(*rq2) || 2501 len < rq2->sadb_x_ipsecrequest_len || 2502 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2503 return -EINVAL; 2504 2505 /* new endpoints */ 2506 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2507 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2508 &m->new_saddr, &m->new_daddr, 2509 &m->new_family); 2510 if (err) 2511 return err; 2512 2513 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2514 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2515 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2516 return -EINVAL; 2517 2518 m->proto = rq1->sadb_x_ipsecrequest_proto; 2519 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2520 return -EINVAL; 2521 m->mode = mode; 2522 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2523 2524 return ((int)(rq1->sadb_x_ipsecrequest_len + 2525 rq2->sadb_x_ipsecrequest_len)); 2526 } 2527 2528 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2529 const struct sadb_msg *hdr, void * const *ext_hdrs) 2530 { 2531 int i, len, ret, err = -EINVAL; 2532 u8 dir; 2533 struct sadb_address *sa; 2534 struct sadb_x_kmaddress *kma; 2535 struct sadb_x_policy *pol; 2536 struct sadb_x_ipsecrequest *rq; 2537 struct xfrm_selector sel; 2538 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2539 struct xfrm_kmaddress k; 2540 struct net *net = sock_net(sk); 2541 2542 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2543 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2544 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2545 err = -EINVAL; 2546 goto out; 2547 } 2548 2549 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2550 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2551 2552 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2553 err = -EINVAL; 2554 goto out; 2555 } 2556 2557 if (kma) { 2558 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2559 k.reserved = kma->sadb_x_kmaddress_reserved; 2560 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2561 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2562 &k.local, &k.remote, &k.family); 2563 if (ret < 0) { 2564 err = ret; 2565 goto out; 2566 } 2567 } 2568 2569 dir = pol->sadb_x_policy_dir - 1; 2570 memset(&sel, 0, sizeof(sel)); 2571 2572 /* set source address info of selector */ 2573 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2574 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2575 sel.prefixlen_s = sa->sadb_address_prefixlen; 2576 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2577 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2578 if (sel.sport) 2579 sel.sport_mask = htons(0xffff); 2580 2581 /* set destination address info of selector */ 2582 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2583 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2584 sel.prefixlen_d = sa->sadb_address_prefixlen; 2585 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2586 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2587 if (sel.dport) 2588 sel.dport_mask = htons(0xffff); 2589 2590 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2591 2592 /* extract ipsecrequests */ 2593 i = 0; 2594 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2595 2596 while (len > 0 && i < XFRM_MAX_DEPTH) { 2597 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2598 if (ret < 0) { 2599 err = ret; 2600 goto out; 2601 } else { 2602 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2603 len -= ret; 2604 i++; 2605 } 2606 } 2607 2608 if (!i || len > 0) { 2609 err = -EINVAL; 2610 goto out; 2611 } 2612 2613 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2614 kma ? &k : NULL, net); 2615 2616 out: 2617 return err; 2618 } 2619 #else 2620 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2621 const struct sadb_msg *hdr, void * const *ext_hdrs) 2622 { 2623 return -ENOPROTOOPT; 2624 } 2625 #endif 2626 2627 2628 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2629 { 2630 struct net *net = sock_net(sk); 2631 unsigned int dir; 2632 int err = 0, delete; 2633 struct sadb_x_policy *pol; 2634 struct xfrm_policy *xp; 2635 struct km_event c; 2636 2637 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2638 return -EINVAL; 2639 2640 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2641 if (dir >= XFRM_POLICY_MAX) 2642 return -EINVAL; 2643 2644 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2645 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2646 dir, pol->sadb_x_policy_id, delete, &err); 2647 if (xp == NULL) 2648 return -ENOENT; 2649 2650 if (delete) { 2651 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2652 2653 if (err) 2654 goto out; 2655 c.seq = hdr->sadb_msg_seq; 2656 c.portid = hdr->sadb_msg_pid; 2657 c.data.byid = 1; 2658 c.event = XFRM_MSG_DELPOLICY; 2659 km_policy_notify(xp, dir, &c); 2660 } else { 2661 err = key_pol_get_resp(sk, xp, hdr, dir); 2662 } 2663 2664 out: 2665 xfrm_pol_put(xp); 2666 if (delete && err == 0) 2667 xfrm_garbage_collect(net); 2668 return err; 2669 } 2670 2671 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2672 { 2673 struct pfkey_sock *pfk = ptr; 2674 struct sk_buff *out_skb; 2675 struct sadb_msg *out_hdr; 2676 int err; 2677 2678 if (!pfkey_can_dump(&pfk->sk)) 2679 return -ENOBUFS; 2680 2681 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2682 if (IS_ERR(out_skb)) 2683 return PTR_ERR(out_skb); 2684 2685 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2686 if (err < 0) 2687 return err; 2688 2689 out_hdr = (struct sadb_msg *) out_skb->data; 2690 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2691 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2692 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2693 out_hdr->sadb_msg_errno = 0; 2694 out_hdr->sadb_msg_seq = count + 1; 2695 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2696 2697 if (pfk->dump.skb) 2698 pfkey_broadcast(pfk->dump.skb, BROADCAST_ONE, 2699 &pfk->sk, sock_net(&pfk->sk)); 2700 pfk->dump.skb = out_skb; 2701 2702 return 0; 2703 } 2704 2705 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2706 { 2707 struct net *net = sock_net(&pfk->sk); 2708 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2709 } 2710 2711 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2712 { 2713 struct net *net = sock_net((struct sock *)pfk); 2714 2715 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2716 } 2717 2718 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2719 { 2720 struct pfkey_sock *pfk = pfkey_sk(sk); 2721 2722 mutex_lock(&pfk->dump_lock); 2723 if (pfk->dump.dump != NULL) { 2724 mutex_unlock(&pfk->dump_lock); 2725 return -EBUSY; 2726 } 2727 2728 pfk->dump.msg_version = hdr->sadb_msg_version; 2729 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2730 pfk->dump.dump = pfkey_dump_sp; 2731 pfk->dump.done = pfkey_dump_sp_done; 2732 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2733 mutex_unlock(&pfk->dump_lock); 2734 2735 return pfkey_do_dump(pfk); 2736 } 2737 2738 static int key_notify_policy_flush(const struct km_event *c) 2739 { 2740 struct sk_buff *skb_out; 2741 struct sadb_msg *hdr; 2742 2743 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2744 if (!skb_out) 2745 return -ENOBUFS; 2746 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2747 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2748 hdr->sadb_msg_seq = c->seq; 2749 hdr->sadb_msg_pid = c->portid; 2750 hdr->sadb_msg_version = PF_KEY_V2; 2751 hdr->sadb_msg_errno = (uint8_t) 0; 2752 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2753 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2754 hdr->sadb_msg_reserved = 0; 2755 pfkey_broadcast(skb_out, BROADCAST_ALL, NULL, c->net); 2756 return 0; 2757 2758 } 2759 2760 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2761 { 2762 struct net *net = sock_net(sk); 2763 struct km_event c; 2764 int err, err2; 2765 2766 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2767 if (!err) 2768 xfrm_garbage_collect(net); 2769 err2 = unicast_flush_resp(sk, hdr); 2770 if (err || err2) { 2771 if (err == -ESRCH) /* empty table - old silent behavior */ 2772 return 0; 2773 return err; 2774 } 2775 2776 c.data.type = XFRM_POLICY_TYPE_MAIN; 2777 c.event = XFRM_MSG_FLUSHPOLICY; 2778 c.portid = hdr->sadb_msg_pid; 2779 c.seq = hdr->sadb_msg_seq; 2780 c.net = net; 2781 km_policy_notify(NULL, 0, &c); 2782 2783 return 0; 2784 } 2785 2786 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2787 const struct sadb_msg *hdr, void * const *ext_hdrs); 2788 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2789 [SADB_RESERVED] = pfkey_reserved, 2790 [SADB_GETSPI] = pfkey_getspi, 2791 [SADB_UPDATE] = pfkey_add, 2792 [SADB_ADD] = pfkey_add, 2793 [SADB_DELETE] = pfkey_delete, 2794 [SADB_GET] = pfkey_get, 2795 [SADB_ACQUIRE] = pfkey_acquire, 2796 [SADB_REGISTER] = pfkey_register, 2797 [SADB_EXPIRE] = NULL, 2798 [SADB_FLUSH] = pfkey_flush, 2799 [SADB_DUMP] = pfkey_dump, 2800 [SADB_X_PROMISC] = pfkey_promisc, 2801 [SADB_X_PCHANGE] = NULL, 2802 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2803 [SADB_X_SPDADD] = pfkey_spdadd, 2804 [SADB_X_SPDDELETE] = pfkey_spddelete, 2805 [SADB_X_SPDGET] = pfkey_spdget, 2806 [SADB_X_SPDACQUIRE] = NULL, 2807 [SADB_X_SPDDUMP] = pfkey_spddump, 2808 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2809 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2810 [SADB_X_SPDDELETE2] = pfkey_spdget, 2811 [SADB_X_MIGRATE] = pfkey_migrate, 2812 }; 2813 2814 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2815 { 2816 void *ext_hdrs[SADB_EXT_MAX]; 2817 int err; 2818 2819 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), 2820 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2821 2822 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2823 err = parse_exthdrs(skb, hdr, ext_hdrs); 2824 if (!err) { 2825 err = -EOPNOTSUPP; 2826 if (pfkey_funcs[hdr->sadb_msg_type]) 2827 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2828 } 2829 return err; 2830 } 2831 2832 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2833 { 2834 struct sadb_msg *hdr = NULL; 2835 2836 if (skb->len < sizeof(*hdr)) { 2837 *errp = -EMSGSIZE; 2838 } else { 2839 hdr = (struct sadb_msg *) skb->data; 2840 if (hdr->sadb_msg_version != PF_KEY_V2 || 2841 hdr->sadb_msg_reserved != 0 || 2842 (hdr->sadb_msg_type <= SADB_RESERVED || 2843 hdr->sadb_msg_type > SADB_MAX)) { 2844 hdr = NULL; 2845 *errp = -EINVAL; 2846 } else if (hdr->sadb_msg_len != (skb->len / 2847 sizeof(uint64_t)) || 2848 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2849 sizeof(uint64_t))) { 2850 hdr = NULL; 2851 *errp = -EMSGSIZE; 2852 } else { 2853 *errp = 0; 2854 } 2855 } 2856 return hdr; 2857 } 2858 2859 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2860 const struct xfrm_algo_desc *d) 2861 { 2862 unsigned int id = d->desc.sadb_alg_id; 2863 2864 if (id >= sizeof(t->aalgos) * 8) 2865 return 0; 2866 2867 return (t->aalgos >> id) & 1; 2868 } 2869 2870 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2871 const struct xfrm_algo_desc *d) 2872 { 2873 unsigned int id = d->desc.sadb_alg_id; 2874 2875 if (id >= sizeof(t->ealgos) * 8) 2876 return 0; 2877 2878 return (t->ealgos >> id) & 1; 2879 } 2880 2881 static int count_ah_combs(const struct xfrm_tmpl *t) 2882 { 2883 int i, sz = 0; 2884 2885 for (i = 0; ; i++) { 2886 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2887 if (!aalg) 2888 break; 2889 if (!aalg->pfkey_supported) 2890 continue; 2891 if (aalg_tmpl_set(t, aalg) && aalg->available) 2892 sz += sizeof(struct sadb_comb); 2893 } 2894 return sz + sizeof(struct sadb_prop); 2895 } 2896 2897 static int count_esp_combs(const struct xfrm_tmpl *t) 2898 { 2899 int i, k, sz = 0; 2900 2901 for (i = 0; ; i++) { 2902 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2903 if (!ealg) 2904 break; 2905 2906 if (!ealg->pfkey_supported) 2907 continue; 2908 2909 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2910 continue; 2911 2912 for (k = 1; ; k++) { 2913 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2914 if (!aalg) 2915 break; 2916 2917 if (!aalg->pfkey_supported) 2918 continue; 2919 2920 if (aalg_tmpl_set(t, aalg) && aalg->available) 2921 sz += sizeof(struct sadb_comb); 2922 } 2923 } 2924 return sz + sizeof(struct sadb_prop); 2925 } 2926 2927 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2928 { 2929 struct sadb_prop *p; 2930 int i; 2931 2932 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2933 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2934 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2935 p->sadb_prop_replay = 32; 2936 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2937 2938 for (i = 0; ; i++) { 2939 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2940 if (!aalg) 2941 break; 2942 2943 if (!aalg->pfkey_supported) 2944 continue; 2945 2946 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2947 struct sadb_comb *c; 2948 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2949 memset(c, 0, sizeof(*c)); 2950 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2951 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2952 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2953 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2954 c->sadb_comb_hard_addtime = 24*60*60; 2955 c->sadb_comb_soft_addtime = 20*60*60; 2956 c->sadb_comb_hard_usetime = 8*60*60; 2957 c->sadb_comb_soft_usetime = 7*60*60; 2958 } 2959 } 2960 } 2961 2962 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2963 { 2964 struct sadb_prop *p; 2965 int i, k; 2966 2967 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2968 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2969 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2970 p->sadb_prop_replay = 32; 2971 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2972 2973 for (i=0; ; i++) { 2974 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2975 if (!ealg) 2976 break; 2977 2978 if (!ealg->pfkey_supported) 2979 continue; 2980 2981 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2982 continue; 2983 2984 for (k = 1; ; k++) { 2985 struct sadb_comb *c; 2986 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2987 if (!aalg) 2988 break; 2989 if (!aalg->pfkey_supported) 2990 continue; 2991 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2992 continue; 2993 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2994 memset(c, 0, sizeof(*c)); 2995 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2996 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2997 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2998 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2999 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3000 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3001 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3002 c->sadb_comb_hard_addtime = 24*60*60; 3003 c->sadb_comb_soft_addtime = 20*60*60; 3004 c->sadb_comb_hard_usetime = 8*60*60; 3005 c->sadb_comb_soft_usetime = 7*60*60; 3006 } 3007 } 3008 } 3009 3010 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3011 { 3012 return 0; 3013 } 3014 3015 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3016 { 3017 struct sk_buff *out_skb; 3018 struct sadb_msg *out_hdr; 3019 int hard; 3020 int hsc; 3021 3022 hard = c->data.hard; 3023 if (hard) 3024 hsc = 2; 3025 else 3026 hsc = 1; 3027 3028 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3029 if (IS_ERR(out_skb)) 3030 return PTR_ERR(out_skb); 3031 3032 out_hdr = (struct sadb_msg *) out_skb->data; 3033 out_hdr->sadb_msg_version = PF_KEY_V2; 3034 out_hdr->sadb_msg_type = SADB_EXPIRE; 3035 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3036 out_hdr->sadb_msg_errno = 0; 3037 out_hdr->sadb_msg_reserved = 0; 3038 out_hdr->sadb_msg_seq = 0; 3039 out_hdr->sadb_msg_pid = 0; 3040 3041 pfkey_broadcast(out_skb, BROADCAST_REGISTERED, NULL, xs_net(x)); 3042 return 0; 3043 } 3044 3045 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3046 { 3047 struct net *net = x ? xs_net(x) : c->net; 3048 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3049 3050 if (atomic_read(&net_pfkey->socks_nr) == 0) 3051 return 0; 3052 3053 switch (c->event) { 3054 case XFRM_MSG_EXPIRE: 3055 return key_notify_sa_expire(x, c); 3056 case XFRM_MSG_DELSA: 3057 case XFRM_MSG_NEWSA: 3058 case XFRM_MSG_UPDSA: 3059 return key_notify_sa(x, c); 3060 case XFRM_MSG_FLUSHSA: 3061 return key_notify_sa_flush(c); 3062 case XFRM_MSG_NEWAE: /* not yet supported */ 3063 break; 3064 default: 3065 pr_err("pfkey: Unknown SA event %d\n", c->event); 3066 break; 3067 } 3068 3069 return 0; 3070 } 3071 3072 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3073 { 3074 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3075 return 0; 3076 3077 switch (c->event) { 3078 case XFRM_MSG_POLEXPIRE: 3079 return key_notify_policy_expire(xp, c); 3080 case XFRM_MSG_DELPOLICY: 3081 case XFRM_MSG_NEWPOLICY: 3082 case XFRM_MSG_UPDPOLICY: 3083 return key_notify_policy(xp, dir, c); 3084 case XFRM_MSG_FLUSHPOLICY: 3085 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3086 break; 3087 return key_notify_policy_flush(c); 3088 default: 3089 pr_err("pfkey: Unknown policy event %d\n", c->event); 3090 break; 3091 } 3092 3093 return 0; 3094 } 3095 3096 static u32 get_acqseq(void) 3097 { 3098 u32 res; 3099 static atomic_t acqseq; 3100 3101 do { 3102 res = atomic_inc_return(&acqseq); 3103 } while (!res); 3104 return res; 3105 } 3106 3107 static bool pfkey_is_alive(const struct km_event *c) 3108 { 3109 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3110 struct sock *sk; 3111 bool is_alive = false; 3112 3113 rcu_read_lock(); 3114 sk_for_each_rcu(sk, &net_pfkey->table) { 3115 if (pfkey_sk(sk)->registered) { 3116 is_alive = true; 3117 break; 3118 } 3119 } 3120 rcu_read_unlock(); 3121 3122 return is_alive; 3123 } 3124 3125 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3126 { 3127 struct sk_buff *skb; 3128 struct sadb_msg *hdr; 3129 struct sadb_address *addr; 3130 struct sadb_x_policy *pol; 3131 int sockaddr_size; 3132 int size; 3133 struct sadb_x_sec_ctx *sec_ctx; 3134 struct xfrm_sec_ctx *xfrm_ctx; 3135 int ctx_size = 0; 3136 3137 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3138 if (!sockaddr_size) 3139 return -EINVAL; 3140 3141 size = sizeof(struct sadb_msg) + 3142 (sizeof(struct sadb_address) * 2) + 3143 (sockaddr_size * 2) + 3144 sizeof(struct sadb_x_policy); 3145 3146 if (x->id.proto == IPPROTO_AH) 3147 size += count_ah_combs(t); 3148 else if (x->id.proto == IPPROTO_ESP) 3149 size += count_esp_combs(t); 3150 3151 if ((xfrm_ctx = x->security)) { 3152 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3153 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3154 } 3155 3156 skb = alloc_skb(size + 16, GFP_ATOMIC); 3157 if (skb == NULL) 3158 return -ENOMEM; 3159 3160 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3161 hdr->sadb_msg_version = PF_KEY_V2; 3162 hdr->sadb_msg_type = SADB_ACQUIRE; 3163 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3164 hdr->sadb_msg_len = size / sizeof(uint64_t); 3165 hdr->sadb_msg_errno = 0; 3166 hdr->sadb_msg_reserved = 0; 3167 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3168 hdr->sadb_msg_pid = 0; 3169 3170 /* src address */ 3171 addr = (struct sadb_address*) skb_put(skb, 3172 sizeof(struct sadb_address)+sockaddr_size); 3173 addr->sadb_address_len = 3174 (sizeof(struct sadb_address)+sockaddr_size)/ 3175 sizeof(uint64_t); 3176 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3177 addr->sadb_address_proto = 0; 3178 addr->sadb_address_reserved = 0; 3179 addr->sadb_address_prefixlen = 3180 pfkey_sockaddr_fill(&x->props.saddr, 0, 3181 (struct sockaddr *) (addr + 1), 3182 x->props.family); 3183 if (!addr->sadb_address_prefixlen) 3184 BUG(); 3185 3186 /* dst address */ 3187 addr = (struct sadb_address*) skb_put(skb, 3188 sizeof(struct sadb_address)+sockaddr_size); 3189 addr->sadb_address_len = 3190 (sizeof(struct sadb_address)+sockaddr_size)/ 3191 sizeof(uint64_t); 3192 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3193 addr->sadb_address_proto = 0; 3194 addr->sadb_address_reserved = 0; 3195 addr->sadb_address_prefixlen = 3196 pfkey_sockaddr_fill(&x->id.daddr, 0, 3197 (struct sockaddr *) (addr + 1), 3198 x->props.family); 3199 if (!addr->sadb_address_prefixlen) 3200 BUG(); 3201 3202 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3203 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3204 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3205 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3206 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3207 pol->sadb_x_policy_reserved = 0; 3208 pol->sadb_x_policy_id = xp->index; 3209 pol->sadb_x_policy_priority = xp->priority; 3210 3211 /* Set sadb_comb's. */ 3212 if (x->id.proto == IPPROTO_AH) 3213 dump_ah_combs(skb, t); 3214 else if (x->id.proto == IPPROTO_ESP) 3215 dump_esp_combs(skb, t); 3216 3217 /* security context */ 3218 if (xfrm_ctx) { 3219 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3220 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3221 sec_ctx->sadb_x_sec_len = 3222 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3223 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3224 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3225 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3226 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3227 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3228 xfrm_ctx->ctx_len); 3229 } 3230 3231 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x)); 3232 } 3233 3234 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3235 u8 *data, int len, int *dir) 3236 { 3237 struct net *net = sock_net(sk); 3238 struct xfrm_policy *xp; 3239 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3240 struct sadb_x_sec_ctx *sec_ctx; 3241 3242 switch (sk->sk_family) { 3243 case AF_INET: 3244 if (opt != IP_IPSEC_POLICY) { 3245 *dir = -EOPNOTSUPP; 3246 return NULL; 3247 } 3248 break; 3249 #if IS_ENABLED(CONFIG_IPV6) 3250 case AF_INET6: 3251 if (opt != IPV6_IPSEC_POLICY) { 3252 *dir = -EOPNOTSUPP; 3253 return NULL; 3254 } 3255 break; 3256 #endif 3257 default: 3258 *dir = -EINVAL; 3259 return NULL; 3260 } 3261 3262 *dir = -EINVAL; 3263 3264 if (len < sizeof(struct sadb_x_policy) || 3265 pol->sadb_x_policy_len*8 > len || 3266 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3267 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3268 return NULL; 3269 3270 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3271 if (xp == NULL) { 3272 *dir = -ENOBUFS; 3273 return NULL; 3274 } 3275 3276 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3277 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3278 3279 xp->lft.soft_byte_limit = XFRM_INF; 3280 xp->lft.hard_byte_limit = XFRM_INF; 3281 xp->lft.soft_packet_limit = XFRM_INF; 3282 xp->lft.hard_packet_limit = XFRM_INF; 3283 xp->family = sk->sk_family; 3284 3285 xp->xfrm_nr = 0; 3286 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3287 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3288 goto out; 3289 3290 /* security context too */ 3291 if (len >= (pol->sadb_x_policy_len*8 + 3292 sizeof(struct sadb_x_sec_ctx))) { 3293 char *p = (char *)pol; 3294 struct xfrm_user_sec_ctx *uctx; 3295 3296 p += pol->sadb_x_policy_len*8; 3297 sec_ctx = (struct sadb_x_sec_ctx *)p; 3298 if (len < pol->sadb_x_policy_len*8 + 3299 sec_ctx->sadb_x_sec_len*8) { 3300 *dir = -EINVAL; 3301 goto out; 3302 } 3303 if ((*dir = verify_sec_ctx_len(p))) 3304 goto out; 3305 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3306 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3307 kfree(uctx); 3308 3309 if (*dir) 3310 goto out; 3311 } 3312 3313 *dir = pol->sadb_x_policy_dir-1; 3314 return xp; 3315 3316 out: 3317 xp->walk.dead = 1; 3318 xfrm_policy_destroy(xp); 3319 return NULL; 3320 } 3321 3322 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3323 { 3324 struct sk_buff *skb; 3325 struct sadb_msg *hdr; 3326 struct sadb_sa *sa; 3327 struct sadb_address *addr; 3328 struct sadb_x_nat_t_port *n_port; 3329 int sockaddr_size; 3330 int size; 3331 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3332 struct xfrm_encap_tmpl *natt = NULL; 3333 3334 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3335 if (!sockaddr_size) 3336 return -EINVAL; 3337 3338 if (!satype) 3339 return -EINVAL; 3340 3341 if (!x->encap) 3342 return -EINVAL; 3343 3344 natt = x->encap; 3345 3346 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3347 * 3348 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3349 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3350 */ 3351 3352 size = sizeof(struct sadb_msg) + 3353 sizeof(struct sadb_sa) + 3354 (sizeof(struct sadb_address) * 2) + 3355 (sockaddr_size * 2) + 3356 (sizeof(struct sadb_x_nat_t_port) * 2); 3357 3358 skb = alloc_skb(size + 16, GFP_ATOMIC); 3359 if (skb == NULL) 3360 return -ENOMEM; 3361 3362 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3363 hdr->sadb_msg_version = PF_KEY_V2; 3364 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3365 hdr->sadb_msg_satype = satype; 3366 hdr->sadb_msg_len = size / sizeof(uint64_t); 3367 hdr->sadb_msg_errno = 0; 3368 hdr->sadb_msg_reserved = 0; 3369 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3370 hdr->sadb_msg_pid = 0; 3371 3372 /* SA */ 3373 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3374 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3375 sa->sadb_sa_exttype = SADB_EXT_SA; 3376 sa->sadb_sa_spi = x->id.spi; 3377 sa->sadb_sa_replay = 0; 3378 sa->sadb_sa_state = 0; 3379 sa->sadb_sa_auth = 0; 3380 sa->sadb_sa_encrypt = 0; 3381 sa->sadb_sa_flags = 0; 3382 3383 /* ADDRESS_SRC (old addr) */ 3384 addr = (struct sadb_address*) 3385 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3386 addr->sadb_address_len = 3387 (sizeof(struct sadb_address)+sockaddr_size)/ 3388 sizeof(uint64_t); 3389 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3390 addr->sadb_address_proto = 0; 3391 addr->sadb_address_reserved = 0; 3392 addr->sadb_address_prefixlen = 3393 pfkey_sockaddr_fill(&x->props.saddr, 0, 3394 (struct sockaddr *) (addr + 1), 3395 x->props.family); 3396 if (!addr->sadb_address_prefixlen) 3397 BUG(); 3398 3399 /* NAT_T_SPORT (old port) */ 3400 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3401 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3402 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3403 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3404 n_port->sadb_x_nat_t_port_reserved = 0; 3405 3406 /* ADDRESS_DST (new addr) */ 3407 addr = (struct sadb_address*) 3408 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3409 addr->sadb_address_len = 3410 (sizeof(struct sadb_address)+sockaddr_size)/ 3411 sizeof(uint64_t); 3412 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3413 addr->sadb_address_proto = 0; 3414 addr->sadb_address_reserved = 0; 3415 addr->sadb_address_prefixlen = 3416 pfkey_sockaddr_fill(ipaddr, 0, 3417 (struct sockaddr *) (addr + 1), 3418 x->props.family); 3419 if (!addr->sadb_address_prefixlen) 3420 BUG(); 3421 3422 /* NAT_T_DPORT (new port) */ 3423 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3424 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3425 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3426 n_port->sadb_x_nat_t_port_port = sport; 3427 n_port->sadb_x_nat_t_port_reserved = 0; 3428 3429 return pfkey_broadcast(skb, BROADCAST_REGISTERED, NULL, xs_net(x)); 3430 } 3431 3432 #ifdef CONFIG_NET_KEY_MIGRATE 3433 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3434 const struct xfrm_selector *sel) 3435 { 3436 struct sadb_address *addr; 3437 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3438 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3439 addr->sadb_address_exttype = type; 3440 addr->sadb_address_proto = sel->proto; 3441 addr->sadb_address_reserved = 0; 3442 3443 switch (type) { 3444 case SADB_EXT_ADDRESS_SRC: 3445 addr->sadb_address_prefixlen = sel->prefixlen_s; 3446 pfkey_sockaddr_fill(&sel->saddr, 0, 3447 (struct sockaddr *)(addr + 1), 3448 sel->family); 3449 break; 3450 case SADB_EXT_ADDRESS_DST: 3451 addr->sadb_address_prefixlen = sel->prefixlen_d; 3452 pfkey_sockaddr_fill(&sel->daddr, 0, 3453 (struct sockaddr *)(addr + 1), 3454 sel->family); 3455 break; 3456 default: 3457 return -EINVAL; 3458 } 3459 3460 return 0; 3461 } 3462 3463 3464 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3465 { 3466 struct sadb_x_kmaddress *kma; 3467 u8 *sa; 3468 int family = k->family; 3469 int socklen = pfkey_sockaddr_len(family); 3470 int size_req; 3471 3472 size_req = (sizeof(struct sadb_x_kmaddress) + 3473 pfkey_sockaddr_pair_size(family)); 3474 3475 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3476 memset(kma, 0, size_req); 3477 kma->sadb_x_kmaddress_len = size_req / 8; 3478 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3479 kma->sadb_x_kmaddress_reserved = k->reserved; 3480 3481 sa = (u8 *)(kma + 1); 3482 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3483 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3484 return -EINVAL; 3485 3486 return 0; 3487 } 3488 3489 static int set_ipsecrequest(struct sk_buff *skb, 3490 uint8_t proto, uint8_t mode, int level, 3491 uint32_t reqid, uint8_t family, 3492 const xfrm_address_t *src, const xfrm_address_t *dst) 3493 { 3494 struct sadb_x_ipsecrequest *rq; 3495 u8 *sa; 3496 int socklen = pfkey_sockaddr_len(family); 3497 int size_req; 3498 3499 size_req = sizeof(struct sadb_x_ipsecrequest) + 3500 pfkey_sockaddr_pair_size(family); 3501 3502 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3503 memset(rq, 0, size_req); 3504 rq->sadb_x_ipsecrequest_len = size_req; 3505 rq->sadb_x_ipsecrequest_proto = proto; 3506 rq->sadb_x_ipsecrequest_mode = mode; 3507 rq->sadb_x_ipsecrequest_level = level; 3508 rq->sadb_x_ipsecrequest_reqid = reqid; 3509 3510 sa = (u8 *) (rq + 1); 3511 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3512 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3513 return -EINVAL; 3514 3515 return 0; 3516 } 3517 #endif 3518 3519 #ifdef CONFIG_NET_KEY_MIGRATE 3520 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3521 const struct xfrm_migrate *m, int num_bundles, 3522 const struct xfrm_kmaddress *k) 3523 { 3524 int i; 3525 int sasize_sel; 3526 int size = 0; 3527 int size_pol = 0; 3528 struct sk_buff *skb; 3529 struct sadb_msg *hdr; 3530 struct sadb_x_policy *pol; 3531 const struct xfrm_migrate *mp; 3532 3533 if (type != XFRM_POLICY_TYPE_MAIN) 3534 return 0; 3535 3536 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3537 return -EINVAL; 3538 3539 if (k != NULL) { 3540 /* addresses for KM */ 3541 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3542 pfkey_sockaddr_pair_size(k->family)); 3543 } 3544 3545 /* selector */ 3546 sasize_sel = pfkey_sockaddr_size(sel->family); 3547 if (!sasize_sel) 3548 return -EINVAL; 3549 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3550 3551 /* policy info */ 3552 size_pol += sizeof(struct sadb_x_policy); 3553 3554 /* ipsecrequests */ 3555 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3556 /* old locator pair */ 3557 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3558 pfkey_sockaddr_pair_size(mp->old_family); 3559 /* new locator pair */ 3560 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3561 pfkey_sockaddr_pair_size(mp->new_family); 3562 } 3563 3564 size += sizeof(struct sadb_msg) + size_pol; 3565 3566 /* alloc buffer */ 3567 skb = alloc_skb(size, GFP_ATOMIC); 3568 if (skb == NULL) 3569 return -ENOMEM; 3570 3571 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3572 hdr->sadb_msg_version = PF_KEY_V2; 3573 hdr->sadb_msg_type = SADB_X_MIGRATE; 3574 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3575 hdr->sadb_msg_len = size / 8; 3576 hdr->sadb_msg_errno = 0; 3577 hdr->sadb_msg_reserved = 0; 3578 hdr->sadb_msg_seq = 0; 3579 hdr->sadb_msg_pid = 0; 3580 3581 /* Addresses to be used by KM for negotiation, if ext is available */ 3582 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3583 goto err; 3584 3585 /* selector src */ 3586 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3587 3588 /* selector dst */ 3589 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3590 3591 /* policy information */ 3592 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3593 pol->sadb_x_policy_len = size_pol / 8; 3594 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3595 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3596 pol->sadb_x_policy_dir = dir + 1; 3597 pol->sadb_x_policy_reserved = 0; 3598 pol->sadb_x_policy_id = 0; 3599 pol->sadb_x_policy_priority = 0; 3600 3601 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3602 /* old ipsecrequest */ 3603 int mode = pfkey_mode_from_xfrm(mp->mode); 3604 if (mode < 0) 3605 goto err; 3606 if (set_ipsecrequest(skb, mp->proto, mode, 3607 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3608 mp->reqid, mp->old_family, 3609 &mp->old_saddr, &mp->old_daddr) < 0) 3610 goto err; 3611 3612 /* new ipsecrequest */ 3613 if (set_ipsecrequest(skb, mp->proto, mode, 3614 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3615 mp->reqid, mp->new_family, 3616 &mp->new_saddr, &mp->new_daddr) < 0) 3617 goto err; 3618 } 3619 3620 /* broadcast migrate message to sockets */ 3621 pfkey_broadcast(skb, BROADCAST_ALL, NULL, &init_net); 3622 3623 return 0; 3624 3625 err: 3626 kfree_skb(skb); 3627 return -EINVAL; 3628 } 3629 #else 3630 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3631 const struct xfrm_migrate *m, int num_bundles, 3632 const struct xfrm_kmaddress *k) 3633 { 3634 return -ENOPROTOOPT; 3635 } 3636 #endif 3637 3638 static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3639 { 3640 struct sock *sk = sock->sk; 3641 struct sk_buff *skb = NULL; 3642 struct sadb_msg *hdr = NULL; 3643 int err; 3644 struct net *net = sock_net(sk); 3645 3646 err = -EOPNOTSUPP; 3647 if (msg->msg_flags & MSG_OOB) 3648 goto out; 3649 3650 err = -EMSGSIZE; 3651 if ((unsigned int)len > sk->sk_sndbuf - 32) 3652 goto out; 3653 3654 err = -ENOBUFS; 3655 skb = alloc_skb(len, GFP_KERNEL); 3656 if (skb == NULL) 3657 goto out; 3658 3659 err = -EFAULT; 3660 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3661 goto out; 3662 3663 hdr = pfkey_get_base_msg(skb, &err); 3664 if (!hdr) 3665 goto out; 3666 3667 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3668 err = pfkey_process(sk, skb, hdr); 3669 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3670 3671 out: 3672 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3673 err = 0; 3674 kfree_skb(skb); 3675 3676 return err ? : len; 3677 } 3678 3679 static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3680 int flags) 3681 { 3682 struct sock *sk = sock->sk; 3683 struct pfkey_sock *pfk = pfkey_sk(sk); 3684 struct sk_buff *skb; 3685 int copied, err; 3686 3687 err = -EINVAL; 3688 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3689 goto out; 3690 3691 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3692 if (skb == NULL) 3693 goto out; 3694 3695 copied = skb->len; 3696 if (copied > len) { 3697 msg->msg_flags |= MSG_TRUNC; 3698 copied = len; 3699 } 3700 3701 skb_reset_transport_header(skb); 3702 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3703 if (err) 3704 goto out_free; 3705 3706 sock_recv_ts_and_drops(msg, sk, skb); 3707 3708 err = (flags & MSG_TRUNC) ? skb->len : copied; 3709 3710 if (pfk->dump.dump != NULL && 3711 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3712 pfkey_do_dump(pfk); 3713 3714 out_free: 3715 skb_free_datagram(sk, skb); 3716 out: 3717 return err; 3718 } 3719 3720 static const struct proto_ops pfkey_ops = { 3721 .family = PF_KEY, 3722 .owner = THIS_MODULE, 3723 /* Operations that make no sense on pfkey sockets. */ 3724 .bind = sock_no_bind, 3725 .connect = sock_no_connect, 3726 .socketpair = sock_no_socketpair, 3727 .accept = sock_no_accept, 3728 .getname = sock_no_getname, 3729 .ioctl = sock_no_ioctl, 3730 .listen = sock_no_listen, 3731 .shutdown = sock_no_shutdown, 3732 .setsockopt = sock_no_setsockopt, 3733 .getsockopt = sock_no_getsockopt, 3734 .mmap = sock_no_mmap, 3735 .sendpage = sock_no_sendpage, 3736 3737 /* Now the operations that really occur. */ 3738 .release = pfkey_release, 3739 .poll = datagram_poll, 3740 .sendmsg = pfkey_sendmsg, 3741 .recvmsg = pfkey_recvmsg, 3742 }; 3743 3744 static const struct net_proto_family pfkey_family_ops = { 3745 .family = PF_KEY, 3746 .create = pfkey_create, 3747 .owner = THIS_MODULE, 3748 }; 3749 3750 #ifdef CONFIG_PROC_FS 3751 static int pfkey_seq_show(struct seq_file *f, void *v) 3752 { 3753 struct sock *s = sk_entry(v); 3754 3755 if (v == SEQ_START_TOKEN) 3756 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3757 else 3758 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3759 s, 3760 atomic_read(&s->sk_refcnt), 3761 sk_rmem_alloc_get(s), 3762 sk_wmem_alloc_get(s), 3763 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3764 sock_i_ino(s) 3765 ); 3766 return 0; 3767 } 3768 3769 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3770 __acquires(rcu) 3771 { 3772 struct net *net = seq_file_net(f); 3773 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3774 3775 rcu_read_lock(); 3776 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3777 } 3778 3779 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3780 { 3781 struct net *net = seq_file_net(f); 3782 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3783 3784 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3785 } 3786 3787 static void pfkey_seq_stop(struct seq_file *f, void *v) 3788 __releases(rcu) 3789 { 3790 rcu_read_unlock(); 3791 } 3792 3793 static const struct seq_operations pfkey_seq_ops = { 3794 .start = pfkey_seq_start, 3795 .next = pfkey_seq_next, 3796 .stop = pfkey_seq_stop, 3797 .show = pfkey_seq_show, 3798 }; 3799 3800 static int pfkey_seq_open(struct inode *inode, struct file *file) 3801 { 3802 return seq_open_net(inode, file, &pfkey_seq_ops, 3803 sizeof(struct seq_net_private)); 3804 } 3805 3806 static const struct file_operations pfkey_proc_ops = { 3807 .open = pfkey_seq_open, 3808 .read = seq_read, 3809 .llseek = seq_lseek, 3810 .release = seq_release_net, 3811 }; 3812 3813 static int __net_init pfkey_init_proc(struct net *net) 3814 { 3815 struct proc_dir_entry *e; 3816 3817 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3818 if (e == NULL) 3819 return -ENOMEM; 3820 3821 return 0; 3822 } 3823 3824 static void __net_exit pfkey_exit_proc(struct net *net) 3825 { 3826 remove_proc_entry("pfkey", net->proc_net); 3827 } 3828 #else 3829 static inline int pfkey_init_proc(struct net *net) 3830 { 3831 return 0; 3832 } 3833 3834 static inline void pfkey_exit_proc(struct net *net) 3835 { 3836 } 3837 #endif 3838 3839 static struct xfrm_mgr pfkeyv2_mgr = 3840 { 3841 .notify = pfkey_send_notify, 3842 .acquire = pfkey_send_acquire, 3843 .compile_policy = pfkey_compile_policy, 3844 .new_mapping = pfkey_send_new_mapping, 3845 .notify_policy = pfkey_send_policy_notify, 3846 .migrate = pfkey_send_migrate, 3847 .is_alive = pfkey_is_alive, 3848 }; 3849 3850 static int __net_init pfkey_net_init(struct net *net) 3851 { 3852 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3853 int rv; 3854 3855 INIT_HLIST_HEAD(&net_pfkey->table); 3856 atomic_set(&net_pfkey->socks_nr, 0); 3857 3858 rv = pfkey_init_proc(net); 3859 3860 return rv; 3861 } 3862 3863 static void __net_exit pfkey_net_exit(struct net *net) 3864 { 3865 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3866 3867 pfkey_exit_proc(net); 3868 BUG_ON(!hlist_empty(&net_pfkey->table)); 3869 } 3870 3871 static struct pernet_operations pfkey_net_ops = { 3872 .init = pfkey_net_init, 3873 .exit = pfkey_net_exit, 3874 .id = &pfkey_net_id, 3875 .size = sizeof(struct netns_pfkey), 3876 }; 3877 3878 static void __exit ipsec_pfkey_exit(void) 3879 { 3880 xfrm_unregister_km(&pfkeyv2_mgr); 3881 sock_unregister(PF_KEY); 3882 unregister_pernet_subsys(&pfkey_net_ops); 3883 proto_unregister(&key_proto); 3884 } 3885 3886 static int __init ipsec_pfkey_init(void) 3887 { 3888 int err = proto_register(&key_proto, 0); 3889 3890 if (err != 0) 3891 goto out; 3892 3893 err = register_pernet_subsys(&pfkey_net_ops); 3894 if (err != 0) 3895 goto out_unregister_key_proto; 3896 err = sock_register(&pfkey_family_ops); 3897 if (err != 0) 3898 goto out_unregister_pernet; 3899 err = xfrm_register_km(&pfkeyv2_mgr); 3900 if (err != 0) 3901 goto out_sock_unregister; 3902 out: 3903 return err; 3904 3905 out_sock_unregister: 3906 sock_unregister(PF_KEY); 3907 out_unregister_pernet: 3908 unregister_pernet_subsys(&pfkey_net_ops); 3909 out_unregister_key_proto: 3910 proto_unregister(&key_proto); 3911 goto out; 3912 } 3913 3914 module_init(ipsec_pfkey_init); 3915 module_exit(ipsec_pfkey_exit); 3916 MODULE_LICENSE("GPL"); 3917 MODULE_ALIAS_NETPROTO(PF_KEY); 3918