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