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, true); 1480 1481 if (err < 0) { 1482 x->km.state = XFRM_STATE_DEAD; 1483 __xfrm_state_put(x); 1484 goto out; 1485 } 1486 1487 if (hdr->sadb_msg_type == SADB_ADD) 1488 c.event = XFRM_MSG_NEWSA; 1489 else 1490 c.event = XFRM_MSG_UPDSA; 1491 c.seq = hdr->sadb_msg_seq; 1492 c.portid = hdr->sadb_msg_pid; 1493 km_state_notify(x, &c); 1494 out: 1495 xfrm_state_put(x); 1496 return err; 1497 } 1498 1499 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1500 { 1501 struct net *net = sock_net(sk); 1502 struct xfrm_state *x; 1503 struct km_event c; 1504 int err; 1505 1506 if (!ext_hdrs[SADB_EXT_SA-1] || 1507 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1508 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1509 return -EINVAL; 1510 1511 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1512 if (x == NULL) 1513 return -ESRCH; 1514 1515 if ((err = security_xfrm_state_delete(x))) 1516 goto out; 1517 1518 if (xfrm_state_kern(x)) { 1519 err = -EPERM; 1520 goto out; 1521 } 1522 1523 err = xfrm_state_delete(x); 1524 1525 if (err < 0) 1526 goto out; 1527 1528 c.seq = hdr->sadb_msg_seq; 1529 c.portid = hdr->sadb_msg_pid; 1530 c.event = XFRM_MSG_DELSA; 1531 km_state_notify(x, &c); 1532 out: 1533 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1534 xfrm_state_put(x); 1535 1536 return err; 1537 } 1538 1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1540 { 1541 struct net *net = sock_net(sk); 1542 __u8 proto; 1543 struct sk_buff *out_skb; 1544 struct sadb_msg *out_hdr; 1545 struct xfrm_state *x; 1546 1547 if (!ext_hdrs[SADB_EXT_SA-1] || 1548 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1549 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1550 return -EINVAL; 1551 1552 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1553 if (x == NULL) 1554 return -ESRCH; 1555 1556 out_skb = pfkey_xfrm_state2msg(x); 1557 proto = x->id.proto; 1558 xfrm_state_put(x); 1559 if (IS_ERR(out_skb)) 1560 return PTR_ERR(out_skb); 1561 1562 out_hdr = (struct sadb_msg *) out_skb->data; 1563 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1564 out_hdr->sadb_msg_type = SADB_GET; 1565 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1566 out_hdr->sadb_msg_errno = 0; 1567 out_hdr->sadb_msg_reserved = 0; 1568 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1569 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1570 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1571 1572 return 0; 1573 } 1574 1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1576 gfp_t allocation) 1577 { 1578 struct sk_buff *skb; 1579 struct sadb_msg *hdr; 1580 int len, auth_len, enc_len, i; 1581 1582 auth_len = xfrm_count_pfkey_auth_supported(); 1583 if (auth_len) { 1584 auth_len *= sizeof(struct sadb_alg); 1585 auth_len += sizeof(struct sadb_supported); 1586 } 1587 1588 enc_len = xfrm_count_pfkey_enc_supported(); 1589 if (enc_len) { 1590 enc_len *= sizeof(struct sadb_alg); 1591 enc_len += sizeof(struct sadb_supported); 1592 } 1593 1594 len = enc_len + auth_len + sizeof(struct sadb_msg); 1595 1596 skb = alloc_skb(len + 16, allocation); 1597 if (!skb) 1598 goto out_put_algs; 1599 1600 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1601 pfkey_hdr_dup(hdr, orig); 1602 hdr->sadb_msg_errno = 0; 1603 hdr->sadb_msg_len = len / sizeof(uint64_t); 1604 1605 if (auth_len) { 1606 struct sadb_supported *sp; 1607 struct sadb_alg *ap; 1608 1609 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1610 ap = (struct sadb_alg *) (sp + 1); 1611 1612 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1613 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1614 1615 for (i = 0; ; i++) { 1616 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1617 if (!aalg) 1618 break; 1619 if (!aalg->pfkey_supported) 1620 continue; 1621 if (aalg->available) 1622 *ap++ = aalg->desc; 1623 } 1624 } 1625 1626 if (enc_len) { 1627 struct sadb_supported *sp; 1628 struct sadb_alg *ap; 1629 1630 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1631 ap = (struct sadb_alg *) (sp + 1); 1632 1633 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1634 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1635 1636 for (i = 0; ; i++) { 1637 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1638 if (!ealg) 1639 break; 1640 if (!ealg->pfkey_supported) 1641 continue; 1642 if (ealg->available) 1643 *ap++ = ealg->desc; 1644 } 1645 } 1646 1647 out_put_algs: 1648 return skb; 1649 } 1650 1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1652 { 1653 struct pfkey_sock *pfk = pfkey_sk(sk); 1654 struct sk_buff *supp_skb; 1655 1656 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1657 return -EINVAL; 1658 1659 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1660 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1661 return -EEXIST; 1662 pfk->registered |= (1<<hdr->sadb_msg_satype); 1663 } 1664 1665 xfrm_probe_algs(); 1666 1667 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1668 if (!supp_skb) { 1669 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1670 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1671 1672 return -ENOBUFS; 1673 } 1674 1675 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk)); 1676 1677 return 0; 1678 } 1679 1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1681 { 1682 struct sk_buff *skb; 1683 struct sadb_msg *hdr; 1684 1685 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1686 if (!skb) 1687 return -ENOBUFS; 1688 1689 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1690 memcpy(hdr, ihdr, sizeof(struct sadb_msg)); 1691 hdr->sadb_msg_errno = (uint8_t) 0; 1692 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1693 1694 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1695 } 1696 1697 static int key_notify_sa_flush(const struct km_event *c) 1698 { 1699 struct sk_buff *skb; 1700 struct sadb_msg *hdr; 1701 1702 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1703 if (!skb) 1704 return -ENOBUFS; 1705 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1706 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1707 hdr->sadb_msg_type = SADB_FLUSH; 1708 hdr->sadb_msg_seq = c->seq; 1709 hdr->sadb_msg_pid = c->portid; 1710 hdr->sadb_msg_version = PF_KEY_V2; 1711 hdr->sadb_msg_errno = (uint8_t) 0; 1712 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1713 hdr->sadb_msg_reserved = 0; 1714 1715 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1716 1717 return 0; 1718 } 1719 1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1721 { 1722 struct net *net = sock_net(sk); 1723 unsigned int proto; 1724 struct km_event c; 1725 int err, err2; 1726 1727 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1728 if (proto == 0) 1729 return -EINVAL; 1730 1731 err = xfrm_state_flush(net, proto, true); 1732 err2 = unicast_flush_resp(sk, hdr); 1733 if (err || err2) { 1734 if (err == -ESRCH) /* empty table - go quietly */ 1735 err = 0; 1736 return err ? err : err2; 1737 } 1738 1739 c.data.proto = proto; 1740 c.seq = hdr->sadb_msg_seq; 1741 c.portid = hdr->sadb_msg_pid; 1742 c.event = XFRM_MSG_FLUSHSA; 1743 c.net = net; 1744 km_state_notify(NULL, &c); 1745 1746 return 0; 1747 } 1748 1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1750 { 1751 struct pfkey_sock *pfk = ptr; 1752 struct sk_buff *out_skb; 1753 struct sadb_msg *out_hdr; 1754 1755 if (!pfkey_can_dump(&pfk->sk)) 1756 return -ENOBUFS; 1757 1758 out_skb = pfkey_xfrm_state2msg(x); 1759 if (IS_ERR(out_skb)) 1760 return PTR_ERR(out_skb); 1761 1762 out_hdr = (struct sadb_msg *) out_skb->data; 1763 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1764 out_hdr->sadb_msg_type = SADB_DUMP; 1765 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1766 out_hdr->sadb_msg_errno = 0; 1767 out_hdr->sadb_msg_reserved = 0; 1768 out_hdr->sadb_msg_seq = count + 1; 1769 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1770 1771 if (pfk->dump.skb) 1772 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1773 &pfk->sk, sock_net(&pfk->sk)); 1774 pfk->dump.skb = out_skb; 1775 1776 return 0; 1777 } 1778 1779 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1780 { 1781 struct net *net = sock_net(&pfk->sk); 1782 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1783 } 1784 1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1786 { 1787 struct net *net = sock_net(&pfk->sk); 1788 1789 xfrm_state_walk_done(&pfk->dump.u.state, net); 1790 } 1791 1792 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1793 { 1794 u8 proto; 1795 struct xfrm_address_filter *filter = NULL; 1796 struct pfkey_sock *pfk = pfkey_sk(sk); 1797 1798 if (pfk->dump.dump != NULL) 1799 return -EBUSY; 1800 1801 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1802 if (proto == 0) 1803 return -EINVAL; 1804 1805 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1806 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1807 1808 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1809 if (filter == NULL) 1810 return -ENOMEM; 1811 1812 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1813 sizeof(xfrm_address_t)); 1814 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1815 sizeof(xfrm_address_t)); 1816 filter->family = xfilter->sadb_x_filter_family; 1817 filter->splen = xfilter->sadb_x_filter_splen; 1818 filter->dplen = xfilter->sadb_x_filter_dplen; 1819 } 1820 1821 pfk->dump.msg_version = hdr->sadb_msg_version; 1822 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1823 pfk->dump.dump = pfkey_dump_sa; 1824 pfk->dump.done = pfkey_dump_sa_done; 1825 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1826 1827 return pfkey_do_dump(pfk); 1828 } 1829 1830 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1831 { 1832 struct pfkey_sock *pfk = pfkey_sk(sk); 1833 int satype = hdr->sadb_msg_satype; 1834 bool reset_errno = false; 1835 1836 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1837 reset_errno = true; 1838 if (satype != 0 && satype != 1) 1839 return -EINVAL; 1840 pfk->promisc = satype; 1841 } 1842 if (reset_errno && skb_cloned(skb)) 1843 skb = skb_copy(skb, GFP_KERNEL); 1844 else 1845 skb = skb_clone(skb, GFP_KERNEL); 1846 1847 if (reset_errno && skb) { 1848 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1849 new_hdr->sadb_msg_errno = 0; 1850 } 1851 1852 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1853 return 0; 1854 } 1855 1856 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1857 { 1858 int i; 1859 u32 reqid = *(u32*)ptr; 1860 1861 for (i=0; i<xp->xfrm_nr; i++) { 1862 if (xp->xfrm_vec[i].reqid == reqid) 1863 return -EEXIST; 1864 } 1865 return 0; 1866 } 1867 1868 static u32 gen_reqid(struct net *net) 1869 { 1870 struct xfrm_policy_walk walk; 1871 u32 start; 1872 int rc; 1873 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1874 1875 start = reqid; 1876 do { 1877 ++reqid; 1878 if (reqid == 0) 1879 reqid = IPSEC_MANUAL_REQID_MAX+1; 1880 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1881 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1882 xfrm_policy_walk_done(&walk, net); 1883 if (rc != -EEXIST) 1884 return reqid; 1885 } while (reqid != start); 1886 return 0; 1887 } 1888 1889 static int 1890 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1891 { 1892 struct net *net = xp_net(xp); 1893 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1894 int mode; 1895 1896 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1897 return -ELOOP; 1898 1899 if (rq->sadb_x_ipsecrequest_mode == 0) 1900 return -EINVAL; 1901 1902 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1903 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1904 return -EINVAL; 1905 t->mode = mode; 1906 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1907 t->optional = 1; 1908 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1909 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1910 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1911 t->reqid = 0; 1912 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1913 return -ENOBUFS; 1914 } 1915 1916 /* addresses present only in tunnel mode */ 1917 if (t->mode == XFRM_MODE_TUNNEL) { 1918 u8 *sa = (u8 *) (rq + 1); 1919 int family, socklen; 1920 1921 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1922 &t->saddr); 1923 if (!family) 1924 return -EINVAL; 1925 1926 socklen = pfkey_sockaddr_len(family); 1927 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1928 &t->id.daddr) != family) 1929 return -EINVAL; 1930 t->encap_family = family; 1931 } else 1932 t->encap_family = xp->family; 1933 1934 /* No way to set this via kame pfkey */ 1935 t->allalgs = 1; 1936 xp->xfrm_nr++; 1937 return 0; 1938 } 1939 1940 static int 1941 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1942 { 1943 int err; 1944 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1945 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1946 1947 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1948 return -EINVAL; 1949 1950 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1951 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1952 return err; 1953 len -= rq->sadb_x_ipsecrequest_len; 1954 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1955 } 1956 return 0; 1957 } 1958 1959 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1960 { 1961 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1962 1963 if (xfrm_ctx) { 1964 int len = sizeof(struct sadb_x_sec_ctx); 1965 len += xfrm_ctx->ctx_len; 1966 return PFKEY_ALIGN8(len); 1967 } 1968 return 0; 1969 } 1970 1971 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 1972 { 1973 const struct xfrm_tmpl *t; 1974 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1975 int socklen = 0; 1976 int i; 1977 1978 for (i=0; i<xp->xfrm_nr; i++) { 1979 t = xp->xfrm_vec + i; 1980 socklen += pfkey_sockaddr_len(t->encap_family); 1981 } 1982 1983 return sizeof(struct sadb_msg) + 1984 (sizeof(struct sadb_lifetime) * 3) + 1985 (sizeof(struct sadb_address) * 2) + 1986 (sockaddr_size * 2) + 1987 sizeof(struct sadb_x_policy) + 1988 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1989 (socklen * 2) + 1990 pfkey_xfrm_policy2sec_ctx_size(xp); 1991 } 1992 1993 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 1994 { 1995 struct sk_buff *skb; 1996 int size; 1997 1998 size = pfkey_xfrm_policy2msg_size(xp); 1999 2000 skb = alloc_skb(size + 16, GFP_ATOMIC); 2001 if (skb == NULL) 2002 return ERR_PTR(-ENOBUFS); 2003 2004 return skb; 2005 } 2006 2007 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2008 { 2009 struct sadb_msg *hdr; 2010 struct sadb_address *addr; 2011 struct sadb_lifetime *lifetime; 2012 struct sadb_x_policy *pol; 2013 struct sadb_x_sec_ctx *sec_ctx; 2014 struct xfrm_sec_ctx *xfrm_ctx; 2015 int i; 2016 int size; 2017 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2018 int socklen = pfkey_sockaddr_len(xp->family); 2019 2020 size = pfkey_xfrm_policy2msg_size(xp); 2021 2022 /* call should fill header later */ 2023 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2024 memset(hdr, 0, size); /* XXX do we need this ? */ 2025 2026 /* src address */ 2027 addr = (struct sadb_address*) skb_put(skb, 2028 sizeof(struct sadb_address)+sockaddr_size); 2029 addr->sadb_address_len = 2030 (sizeof(struct sadb_address)+sockaddr_size)/ 2031 sizeof(uint64_t); 2032 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2033 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2034 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2035 addr->sadb_address_reserved = 0; 2036 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2037 xp->selector.sport, 2038 (struct sockaddr *) (addr + 1), 2039 xp->family)) 2040 BUG(); 2041 2042 /* dst address */ 2043 addr = (struct sadb_address*) skb_put(skb, 2044 sizeof(struct sadb_address)+sockaddr_size); 2045 addr->sadb_address_len = 2046 (sizeof(struct sadb_address)+sockaddr_size)/ 2047 sizeof(uint64_t); 2048 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2049 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2050 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2051 addr->sadb_address_reserved = 0; 2052 2053 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2054 (struct sockaddr *) (addr + 1), 2055 xp->family); 2056 2057 /* hard time */ 2058 lifetime = (struct sadb_lifetime *) skb_put(skb, 2059 sizeof(struct sadb_lifetime)); 2060 lifetime->sadb_lifetime_len = 2061 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2062 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2063 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2064 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2065 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2066 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2067 /* soft time */ 2068 lifetime = (struct sadb_lifetime *) skb_put(skb, 2069 sizeof(struct sadb_lifetime)); 2070 lifetime->sadb_lifetime_len = 2071 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2072 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2073 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2074 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2075 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2076 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2077 /* current time */ 2078 lifetime = (struct sadb_lifetime *) skb_put(skb, 2079 sizeof(struct sadb_lifetime)); 2080 lifetime->sadb_lifetime_len = 2081 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2082 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2083 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2084 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2085 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2086 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2087 2088 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2089 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2090 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2091 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2092 if (xp->action == XFRM_POLICY_ALLOW) { 2093 if (xp->xfrm_nr) 2094 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2095 else 2096 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2097 } 2098 pol->sadb_x_policy_dir = dir+1; 2099 pol->sadb_x_policy_reserved = 0; 2100 pol->sadb_x_policy_id = xp->index; 2101 pol->sadb_x_policy_priority = xp->priority; 2102 2103 for (i=0; i<xp->xfrm_nr; i++) { 2104 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2105 struct sadb_x_ipsecrequest *rq; 2106 int req_size; 2107 int mode; 2108 2109 req_size = sizeof(struct sadb_x_ipsecrequest); 2110 if (t->mode == XFRM_MODE_TUNNEL) { 2111 socklen = pfkey_sockaddr_len(t->encap_family); 2112 req_size += socklen * 2; 2113 } else { 2114 size -= 2*socklen; 2115 } 2116 rq = (void*)skb_put(skb, req_size); 2117 pol->sadb_x_policy_len += req_size/8; 2118 memset(rq, 0, sizeof(*rq)); 2119 rq->sadb_x_ipsecrequest_len = req_size; 2120 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2121 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2122 return -EINVAL; 2123 rq->sadb_x_ipsecrequest_mode = mode; 2124 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2125 if (t->reqid) 2126 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2127 if (t->optional) 2128 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2129 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2130 2131 if (t->mode == XFRM_MODE_TUNNEL) { 2132 u8 *sa = (void *)(rq + 1); 2133 pfkey_sockaddr_fill(&t->saddr, 0, 2134 (struct sockaddr *)sa, 2135 t->encap_family); 2136 pfkey_sockaddr_fill(&t->id.daddr, 0, 2137 (struct sockaddr *) (sa + socklen), 2138 t->encap_family); 2139 } 2140 } 2141 2142 /* security context */ 2143 if ((xfrm_ctx = xp->security)) { 2144 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2145 2146 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2147 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2148 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2149 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2150 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2151 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2152 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2153 xfrm_ctx->ctx_len); 2154 } 2155 2156 hdr->sadb_msg_len = size / sizeof(uint64_t); 2157 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2158 2159 return 0; 2160 } 2161 2162 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2163 { 2164 struct sk_buff *out_skb; 2165 struct sadb_msg *out_hdr; 2166 int err; 2167 2168 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2169 if (IS_ERR(out_skb)) 2170 return PTR_ERR(out_skb); 2171 2172 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2173 if (err < 0) 2174 return err; 2175 2176 out_hdr = (struct sadb_msg *) out_skb->data; 2177 out_hdr->sadb_msg_version = PF_KEY_V2; 2178 2179 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2180 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2181 else 2182 out_hdr->sadb_msg_type = event2poltype(c->event); 2183 out_hdr->sadb_msg_errno = 0; 2184 out_hdr->sadb_msg_seq = c->seq; 2185 out_hdr->sadb_msg_pid = c->portid; 2186 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2187 return 0; 2188 2189 } 2190 2191 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2192 { 2193 struct net *net = sock_net(sk); 2194 int err = 0; 2195 struct sadb_lifetime *lifetime; 2196 struct sadb_address *sa; 2197 struct sadb_x_policy *pol; 2198 struct xfrm_policy *xp; 2199 struct km_event c; 2200 struct sadb_x_sec_ctx *sec_ctx; 2201 2202 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2203 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2204 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2205 return -EINVAL; 2206 2207 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2208 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2209 return -EINVAL; 2210 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2211 return -EINVAL; 2212 2213 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2214 if (xp == NULL) 2215 return -ENOBUFS; 2216 2217 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2218 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2219 xp->priority = pol->sadb_x_policy_priority; 2220 2221 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2222 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2223 xp->selector.family = xp->family; 2224 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2225 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2226 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2227 if (xp->selector.sport) 2228 xp->selector.sport_mask = htons(0xffff); 2229 2230 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2231 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2232 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2233 2234 /* Amusing, we set this twice. KAME apps appear to set same value 2235 * in both addresses. 2236 */ 2237 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2238 2239 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2240 if (xp->selector.dport) 2241 xp->selector.dport_mask = htons(0xffff); 2242 2243 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2244 if (sec_ctx != NULL) { 2245 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2246 2247 if (!uctx) { 2248 err = -ENOBUFS; 2249 goto out; 2250 } 2251 2252 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2253 kfree(uctx); 2254 2255 if (err) 2256 goto out; 2257 } 2258 2259 xp->lft.soft_byte_limit = XFRM_INF; 2260 xp->lft.hard_byte_limit = XFRM_INF; 2261 xp->lft.soft_packet_limit = XFRM_INF; 2262 xp->lft.hard_packet_limit = XFRM_INF; 2263 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2264 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2265 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2266 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2267 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2268 } 2269 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2270 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2271 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2272 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2273 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2274 } 2275 xp->xfrm_nr = 0; 2276 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2277 (err = parse_ipsecrequests(xp, pol)) < 0) 2278 goto out; 2279 2280 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2281 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2282 2283 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2284 2285 if (err) 2286 goto out; 2287 2288 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2289 c.event = XFRM_MSG_UPDPOLICY; 2290 else 2291 c.event = XFRM_MSG_NEWPOLICY; 2292 2293 c.seq = hdr->sadb_msg_seq; 2294 c.portid = hdr->sadb_msg_pid; 2295 2296 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2297 xfrm_pol_put(xp); 2298 return 0; 2299 2300 out: 2301 xp->walk.dead = 1; 2302 xfrm_policy_destroy(xp); 2303 return err; 2304 } 2305 2306 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2307 { 2308 struct net *net = sock_net(sk); 2309 int err; 2310 struct sadb_address *sa; 2311 struct sadb_x_policy *pol; 2312 struct xfrm_policy *xp; 2313 struct xfrm_selector sel; 2314 struct km_event c; 2315 struct sadb_x_sec_ctx *sec_ctx; 2316 struct xfrm_sec_ctx *pol_ctx = NULL; 2317 2318 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2319 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2320 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2321 return -EINVAL; 2322 2323 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2324 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2325 return -EINVAL; 2326 2327 memset(&sel, 0, sizeof(sel)); 2328 2329 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2330 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2331 sel.prefixlen_s = sa->sadb_address_prefixlen; 2332 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2333 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2334 if (sel.sport) 2335 sel.sport_mask = htons(0xffff); 2336 2337 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2338 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2339 sel.prefixlen_d = sa->sadb_address_prefixlen; 2340 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2341 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2342 if (sel.dport) 2343 sel.dport_mask = htons(0xffff); 2344 2345 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2346 if (sec_ctx != NULL) { 2347 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2348 2349 if (!uctx) 2350 return -ENOMEM; 2351 2352 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2353 kfree(uctx); 2354 if (err) 2355 return err; 2356 } 2357 2358 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2359 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2360 1, &err); 2361 security_xfrm_policy_free(pol_ctx); 2362 if (xp == NULL) 2363 return -ENOENT; 2364 2365 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2366 2367 if (err) 2368 goto out; 2369 2370 c.seq = hdr->sadb_msg_seq; 2371 c.portid = hdr->sadb_msg_pid; 2372 c.data.byid = 0; 2373 c.event = XFRM_MSG_DELPOLICY; 2374 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2375 2376 out: 2377 xfrm_pol_put(xp); 2378 if (err == 0) 2379 xfrm_garbage_collect(net); 2380 return err; 2381 } 2382 2383 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2384 { 2385 int err; 2386 struct sk_buff *out_skb; 2387 struct sadb_msg *out_hdr; 2388 err = 0; 2389 2390 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2391 if (IS_ERR(out_skb)) { 2392 err = PTR_ERR(out_skb); 2393 goto out; 2394 } 2395 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2396 if (err < 0) 2397 goto out; 2398 2399 out_hdr = (struct sadb_msg *) out_skb->data; 2400 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2401 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2402 out_hdr->sadb_msg_satype = 0; 2403 out_hdr->sadb_msg_errno = 0; 2404 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2405 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2406 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2407 err = 0; 2408 2409 out: 2410 return err; 2411 } 2412 2413 #ifdef CONFIG_NET_KEY_MIGRATE 2414 static int pfkey_sockaddr_pair_size(sa_family_t family) 2415 { 2416 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2417 } 2418 2419 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2420 xfrm_address_t *saddr, xfrm_address_t *daddr, 2421 u16 *family) 2422 { 2423 int af, socklen; 2424 2425 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2426 return -EINVAL; 2427 2428 af = pfkey_sockaddr_extract(sa, saddr); 2429 if (!af) 2430 return -EINVAL; 2431 2432 socklen = pfkey_sockaddr_len(af); 2433 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2434 daddr) != af) 2435 return -EINVAL; 2436 2437 *family = af; 2438 return 0; 2439 } 2440 2441 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2442 struct xfrm_migrate *m) 2443 { 2444 int err; 2445 struct sadb_x_ipsecrequest *rq2; 2446 int mode; 2447 2448 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2449 len < rq1->sadb_x_ipsecrequest_len) 2450 return -EINVAL; 2451 2452 /* old endoints */ 2453 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2454 rq1->sadb_x_ipsecrequest_len, 2455 &m->old_saddr, &m->old_daddr, 2456 &m->old_family); 2457 if (err) 2458 return err; 2459 2460 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2461 len -= rq1->sadb_x_ipsecrequest_len; 2462 2463 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2464 len < rq2->sadb_x_ipsecrequest_len) 2465 return -EINVAL; 2466 2467 /* new endpoints */ 2468 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2469 rq2->sadb_x_ipsecrequest_len, 2470 &m->new_saddr, &m->new_daddr, 2471 &m->new_family); 2472 if (err) 2473 return err; 2474 2475 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2476 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2477 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2478 return -EINVAL; 2479 2480 m->proto = rq1->sadb_x_ipsecrequest_proto; 2481 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2482 return -EINVAL; 2483 m->mode = mode; 2484 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2485 2486 return ((int)(rq1->sadb_x_ipsecrequest_len + 2487 rq2->sadb_x_ipsecrequest_len)); 2488 } 2489 2490 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2491 const struct sadb_msg *hdr, void * const *ext_hdrs) 2492 { 2493 int i, len, ret, err = -EINVAL; 2494 u8 dir; 2495 struct sadb_address *sa; 2496 struct sadb_x_kmaddress *kma; 2497 struct sadb_x_policy *pol; 2498 struct sadb_x_ipsecrequest *rq; 2499 struct xfrm_selector sel; 2500 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2501 struct xfrm_kmaddress k; 2502 struct net *net = sock_net(sk); 2503 2504 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2505 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2506 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2507 err = -EINVAL; 2508 goto out; 2509 } 2510 2511 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2512 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2513 2514 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2515 err = -EINVAL; 2516 goto out; 2517 } 2518 2519 if (kma) { 2520 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2521 k.reserved = kma->sadb_x_kmaddress_reserved; 2522 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2523 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2524 &k.local, &k.remote, &k.family); 2525 if (ret < 0) { 2526 err = ret; 2527 goto out; 2528 } 2529 } 2530 2531 dir = pol->sadb_x_policy_dir - 1; 2532 memset(&sel, 0, sizeof(sel)); 2533 2534 /* set source address info of selector */ 2535 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2536 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2537 sel.prefixlen_s = sa->sadb_address_prefixlen; 2538 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2539 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2540 if (sel.sport) 2541 sel.sport_mask = htons(0xffff); 2542 2543 /* set destination address info of selector */ 2544 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2545 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2546 sel.prefixlen_d = sa->sadb_address_prefixlen; 2547 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2548 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2549 if (sel.dport) 2550 sel.dport_mask = htons(0xffff); 2551 2552 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2553 2554 /* extract ipsecrequests */ 2555 i = 0; 2556 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2557 2558 while (len > 0 && i < XFRM_MAX_DEPTH) { 2559 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2560 if (ret < 0) { 2561 err = ret; 2562 goto out; 2563 } else { 2564 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2565 len -= ret; 2566 i++; 2567 } 2568 } 2569 2570 if (!i || len > 0) { 2571 err = -EINVAL; 2572 goto out; 2573 } 2574 2575 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2576 kma ? &k : NULL, net); 2577 2578 out: 2579 return err; 2580 } 2581 #else 2582 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2583 const struct sadb_msg *hdr, void * const *ext_hdrs) 2584 { 2585 return -ENOPROTOOPT; 2586 } 2587 #endif 2588 2589 2590 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2591 { 2592 struct net *net = sock_net(sk); 2593 unsigned int dir; 2594 int err = 0, delete; 2595 struct sadb_x_policy *pol; 2596 struct xfrm_policy *xp; 2597 struct km_event c; 2598 2599 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2600 return -EINVAL; 2601 2602 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2603 if (dir >= XFRM_POLICY_MAX) 2604 return -EINVAL; 2605 2606 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2607 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2608 dir, pol->sadb_x_policy_id, delete, &err); 2609 if (xp == NULL) 2610 return -ENOENT; 2611 2612 if (delete) { 2613 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2614 2615 if (err) 2616 goto out; 2617 c.seq = hdr->sadb_msg_seq; 2618 c.portid = hdr->sadb_msg_pid; 2619 c.data.byid = 1; 2620 c.event = XFRM_MSG_DELPOLICY; 2621 km_policy_notify(xp, dir, &c); 2622 } else { 2623 err = key_pol_get_resp(sk, xp, hdr, dir); 2624 } 2625 2626 out: 2627 xfrm_pol_put(xp); 2628 if (delete && err == 0) 2629 xfrm_garbage_collect(net); 2630 return err; 2631 } 2632 2633 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2634 { 2635 struct pfkey_sock *pfk = ptr; 2636 struct sk_buff *out_skb; 2637 struct sadb_msg *out_hdr; 2638 int err; 2639 2640 if (!pfkey_can_dump(&pfk->sk)) 2641 return -ENOBUFS; 2642 2643 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2644 if (IS_ERR(out_skb)) 2645 return PTR_ERR(out_skb); 2646 2647 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2648 if (err < 0) 2649 return err; 2650 2651 out_hdr = (struct sadb_msg *) out_skb->data; 2652 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2653 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2654 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2655 out_hdr->sadb_msg_errno = 0; 2656 out_hdr->sadb_msg_seq = count + 1; 2657 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2658 2659 if (pfk->dump.skb) 2660 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2661 &pfk->sk, sock_net(&pfk->sk)); 2662 pfk->dump.skb = out_skb; 2663 2664 return 0; 2665 } 2666 2667 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2668 { 2669 struct net *net = sock_net(&pfk->sk); 2670 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2671 } 2672 2673 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2674 { 2675 struct net *net = sock_net((struct sock *)pfk); 2676 2677 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2678 } 2679 2680 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2681 { 2682 struct pfkey_sock *pfk = pfkey_sk(sk); 2683 2684 if (pfk->dump.dump != NULL) 2685 return -EBUSY; 2686 2687 pfk->dump.msg_version = hdr->sadb_msg_version; 2688 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2689 pfk->dump.dump = pfkey_dump_sp; 2690 pfk->dump.done = pfkey_dump_sp_done; 2691 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2692 2693 return pfkey_do_dump(pfk); 2694 } 2695 2696 static int key_notify_policy_flush(const struct km_event *c) 2697 { 2698 struct sk_buff *skb_out; 2699 struct sadb_msg *hdr; 2700 2701 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2702 if (!skb_out) 2703 return -ENOBUFS; 2704 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2705 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2706 hdr->sadb_msg_seq = c->seq; 2707 hdr->sadb_msg_pid = c->portid; 2708 hdr->sadb_msg_version = PF_KEY_V2; 2709 hdr->sadb_msg_errno = (uint8_t) 0; 2710 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2711 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2712 hdr->sadb_msg_reserved = 0; 2713 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2714 return 0; 2715 2716 } 2717 2718 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2719 { 2720 struct net *net = sock_net(sk); 2721 struct km_event c; 2722 int err, err2; 2723 2724 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2725 err2 = unicast_flush_resp(sk, hdr); 2726 if (err || err2) { 2727 if (err == -ESRCH) /* empty table - old silent behavior */ 2728 return 0; 2729 return err; 2730 } 2731 2732 c.data.type = XFRM_POLICY_TYPE_MAIN; 2733 c.event = XFRM_MSG_FLUSHPOLICY; 2734 c.portid = hdr->sadb_msg_pid; 2735 c.seq = hdr->sadb_msg_seq; 2736 c.net = net; 2737 km_policy_notify(NULL, 0, &c); 2738 2739 return 0; 2740 } 2741 2742 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2743 const struct sadb_msg *hdr, void * const *ext_hdrs); 2744 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2745 [SADB_RESERVED] = pfkey_reserved, 2746 [SADB_GETSPI] = pfkey_getspi, 2747 [SADB_UPDATE] = pfkey_add, 2748 [SADB_ADD] = pfkey_add, 2749 [SADB_DELETE] = pfkey_delete, 2750 [SADB_GET] = pfkey_get, 2751 [SADB_ACQUIRE] = pfkey_acquire, 2752 [SADB_REGISTER] = pfkey_register, 2753 [SADB_EXPIRE] = NULL, 2754 [SADB_FLUSH] = pfkey_flush, 2755 [SADB_DUMP] = pfkey_dump, 2756 [SADB_X_PROMISC] = pfkey_promisc, 2757 [SADB_X_PCHANGE] = NULL, 2758 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2759 [SADB_X_SPDADD] = pfkey_spdadd, 2760 [SADB_X_SPDDELETE] = pfkey_spddelete, 2761 [SADB_X_SPDGET] = pfkey_spdget, 2762 [SADB_X_SPDACQUIRE] = NULL, 2763 [SADB_X_SPDDUMP] = pfkey_spddump, 2764 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2765 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2766 [SADB_X_SPDDELETE2] = pfkey_spdget, 2767 [SADB_X_MIGRATE] = pfkey_migrate, 2768 }; 2769 2770 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2771 { 2772 void *ext_hdrs[SADB_EXT_MAX]; 2773 int err; 2774 2775 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2776 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2777 2778 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2779 err = parse_exthdrs(skb, hdr, ext_hdrs); 2780 if (!err) { 2781 err = -EOPNOTSUPP; 2782 if (pfkey_funcs[hdr->sadb_msg_type]) 2783 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2784 } 2785 return err; 2786 } 2787 2788 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2789 { 2790 struct sadb_msg *hdr = NULL; 2791 2792 if (skb->len < sizeof(*hdr)) { 2793 *errp = -EMSGSIZE; 2794 } else { 2795 hdr = (struct sadb_msg *) skb->data; 2796 if (hdr->sadb_msg_version != PF_KEY_V2 || 2797 hdr->sadb_msg_reserved != 0 || 2798 (hdr->sadb_msg_type <= SADB_RESERVED || 2799 hdr->sadb_msg_type > SADB_MAX)) { 2800 hdr = NULL; 2801 *errp = -EINVAL; 2802 } else if (hdr->sadb_msg_len != (skb->len / 2803 sizeof(uint64_t)) || 2804 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2805 sizeof(uint64_t))) { 2806 hdr = NULL; 2807 *errp = -EMSGSIZE; 2808 } else { 2809 *errp = 0; 2810 } 2811 } 2812 return hdr; 2813 } 2814 2815 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2816 const struct xfrm_algo_desc *d) 2817 { 2818 unsigned int id = d->desc.sadb_alg_id; 2819 2820 if (id >= sizeof(t->aalgos) * 8) 2821 return 0; 2822 2823 return (t->aalgos >> id) & 1; 2824 } 2825 2826 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2827 const struct xfrm_algo_desc *d) 2828 { 2829 unsigned int id = d->desc.sadb_alg_id; 2830 2831 if (id >= sizeof(t->ealgos) * 8) 2832 return 0; 2833 2834 return (t->ealgos >> id) & 1; 2835 } 2836 2837 static int count_ah_combs(const struct xfrm_tmpl *t) 2838 { 2839 int i, sz = 0; 2840 2841 for (i = 0; ; i++) { 2842 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2843 if (!aalg) 2844 break; 2845 if (!aalg->pfkey_supported) 2846 continue; 2847 if (aalg_tmpl_set(t, aalg) && aalg->available) 2848 sz += sizeof(struct sadb_comb); 2849 } 2850 return sz + sizeof(struct sadb_prop); 2851 } 2852 2853 static int count_esp_combs(const struct xfrm_tmpl *t) 2854 { 2855 int i, k, sz = 0; 2856 2857 for (i = 0; ; i++) { 2858 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2859 if (!ealg) 2860 break; 2861 2862 if (!ealg->pfkey_supported) 2863 continue; 2864 2865 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2866 continue; 2867 2868 for (k = 1; ; k++) { 2869 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2870 if (!aalg) 2871 break; 2872 2873 if (!aalg->pfkey_supported) 2874 continue; 2875 2876 if (aalg_tmpl_set(t, aalg) && aalg->available) 2877 sz += sizeof(struct sadb_comb); 2878 } 2879 } 2880 return sz + sizeof(struct sadb_prop); 2881 } 2882 2883 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2884 { 2885 struct sadb_prop *p; 2886 int i; 2887 2888 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2889 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2890 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2891 p->sadb_prop_replay = 32; 2892 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2893 2894 for (i = 0; ; i++) { 2895 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2896 if (!aalg) 2897 break; 2898 2899 if (!aalg->pfkey_supported) 2900 continue; 2901 2902 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2903 struct sadb_comb *c; 2904 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2905 memset(c, 0, sizeof(*c)); 2906 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2907 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2908 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2909 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2910 c->sadb_comb_hard_addtime = 24*60*60; 2911 c->sadb_comb_soft_addtime = 20*60*60; 2912 c->sadb_comb_hard_usetime = 8*60*60; 2913 c->sadb_comb_soft_usetime = 7*60*60; 2914 } 2915 } 2916 } 2917 2918 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2919 { 2920 struct sadb_prop *p; 2921 int i, k; 2922 2923 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2924 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2925 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2926 p->sadb_prop_replay = 32; 2927 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2928 2929 for (i=0; ; i++) { 2930 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2931 if (!ealg) 2932 break; 2933 2934 if (!ealg->pfkey_supported) 2935 continue; 2936 2937 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2938 continue; 2939 2940 for (k = 1; ; k++) { 2941 struct sadb_comb *c; 2942 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2943 if (!aalg) 2944 break; 2945 if (!aalg->pfkey_supported) 2946 continue; 2947 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2948 continue; 2949 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2950 memset(c, 0, sizeof(*c)); 2951 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2952 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2953 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2954 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2955 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2956 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2957 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2958 c->sadb_comb_hard_addtime = 24*60*60; 2959 c->sadb_comb_soft_addtime = 20*60*60; 2960 c->sadb_comb_hard_usetime = 8*60*60; 2961 c->sadb_comb_soft_usetime = 7*60*60; 2962 } 2963 } 2964 } 2965 2966 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 2967 { 2968 return 0; 2969 } 2970 2971 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 2972 { 2973 struct sk_buff *out_skb; 2974 struct sadb_msg *out_hdr; 2975 int hard; 2976 int hsc; 2977 2978 hard = c->data.hard; 2979 if (hard) 2980 hsc = 2; 2981 else 2982 hsc = 1; 2983 2984 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2985 if (IS_ERR(out_skb)) 2986 return PTR_ERR(out_skb); 2987 2988 out_hdr = (struct sadb_msg *) out_skb->data; 2989 out_hdr->sadb_msg_version = PF_KEY_V2; 2990 out_hdr->sadb_msg_type = SADB_EXPIRE; 2991 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2992 out_hdr->sadb_msg_errno = 0; 2993 out_hdr->sadb_msg_reserved = 0; 2994 out_hdr->sadb_msg_seq = 0; 2995 out_hdr->sadb_msg_pid = 0; 2996 2997 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2998 return 0; 2999 } 3000 3001 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3002 { 3003 struct net *net = x ? xs_net(x) : c->net; 3004 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3005 3006 if (atomic_read(&net_pfkey->socks_nr) == 0) 3007 return 0; 3008 3009 switch (c->event) { 3010 case XFRM_MSG_EXPIRE: 3011 return key_notify_sa_expire(x, c); 3012 case XFRM_MSG_DELSA: 3013 case XFRM_MSG_NEWSA: 3014 case XFRM_MSG_UPDSA: 3015 return key_notify_sa(x, c); 3016 case XFRM_MSG_FLUSHSA: 3017 return key_notify_sa_flush(c); 3018 case XFRM_MSG_NEWAE: /* not yet supported */ 3019 break; 3020 default: 3021 pr_err("pfkey: Unknown SA event %d\n", c->event); 3022 break; 3023 } 3024 3025 return 0; 3026 } 3027 3028 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3029 { 3030 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3031 return 0; 3032 3033 switch (c->event) { 3034 case XFRM_MSG_POLEXPIRE: 3035 return key_notify_policy_expire(xp, c); 3036 case XFRM_MSG_DELPOLICY: 3037 case XFRM_MSG_NEWPOLICY: 3038 case XFRM_MSG_UPDPOLICY: 3039 return key_notify_policy(xp, dir, c); 3040 case XFRM_MSG_FLUSHPOLICY: 3041 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3042 break; 3043 return key_notify_policy_flush(c); 3044 default: 3045 pr_err("pfkey: Unknown policy event %d\n", c->event); 3046 break; 3047 } 3048 3049 return 0; 3050 } 3051 3052 static u32 get_acqseq(void) 3053 { 3054 u32 res; 3055 static atomic_t acqseq; 3056 3057 do { 3058 res = atomic_inc_return(&acqseq); 3059 } while (!res); 3060 return res; 3061 } 3062 3063 static bool pfkey_is_alive(const struct km_event *c) 3064 { 3065 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3066 struct sock *sk; 3067 bool is_alive = false; 3068 3069 rcu_read_lock(); 3070 sk_for_each_rcu(sk, &net_pfkey->table) { 3071 if (pfkey_sk(sk)->registered) { 3072 is_alive = true; 3073 break; 3074 } 3075 } 3076 rcu_read_unlock(); 3077 3078 return is_alive; 3079 } 3080 3081 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3082 { 3083 struct sk_buff *skb; 3084 struct sadb_msg *hdr; 3085 struct sadb_address *addr; 3086 struct sadb_x_policy *pol; 3087 int sockaddr_size; 3088 int size; 3089 struct sadb_x_sec_ctx *sec_ctx; 3090 struct xfrm_sec_ctx *xfrm_ctx; 3091 int ctx_size = 0; 3092 3093 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3094 if (!sockaddr_size) 3095 return -EINVAL; 3096 3097 size = sizeof(struct sadb_msg) + 3098 (sizeof(struct sadb_address) * 2) + 3099 (sockaddr_size * 2) + 3100 sizeof(struct sadb_x_policy); 3101 3102 if (x->id.proto == IPPROTO_AH) 3103 size += count_ah_combs(t); 3104 else if (x->id.proto == IPPROTO_ESP) 3105 size += count_esp_combs(t); 3106 3107 if ((xfrm_ctx = x->security)) { 3108 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3109 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3110 } 3111 3112 skb = alloc_skb(size + 16, GFP_ATOMIC); 3113 if (skb == NULL) 3114 return -ENOMEM; 3115 3116 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3117 hdr->sadb_msg_version = PF_KEY_V2; 3118 hdr->sadb_msg_type = SADB_ACQUIRE; 3119 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3120 hdr->sadb_msg_len = size / sizeof(uint64_t); 3121 hdr->sadb_msg_errno = 0; 3122 hdr->sadb_msg_reserved = 0; 3123 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3124 hdr->sadb_msg_pid = 0; 3125 3126 /* src address */ 3127 addr = (struct sadb_address*) skb_put(skb, 3128 sizeof(struct sadb_address)+sockaddr_size); 3129 addr->sadb_address_len = 3130 (sizeof(struct sadb_address)+sockaddr_size)/ 3131 sizeof(uint64_t); 3132 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3133 addr->sadb_address_proto = 0; 3134 addr->sadb_address_reserved = 0; 3135 addr->sadb_address_prefixlen = 3136 pfkey_sockaddr_fill(&x->props.saddr, 0, 3137 (struct sockaddr *) (addr + 1), 3138 x->props.family); 3139 if (!addr->sadb_address_prefixlen) 3140 BUG(); 3141 3142 /* dst address */ 3143 addr = (struct sadb_address*) skb_put(skb, 3144 sizeof(struct sadb_address)+sockaddr_size); 3145 addr->sadb_address_len = 3146 (sizeof(struct sadb_address)+sockaddr_size)/ 3147 sizeof(uint64_t); 3148 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3149 addr->sadb_address_proto = 0; 3150 addr->sadb_address_reserved = 0; 3151 addr->sadb_address_prefixlen = 3152 pfkey_sockaddr_fill(&x->id.daddr, 0, 3153 (struct sockaddr *) (addr + 1), 3154 x->props.family); 3155 if (!addr->sadb_address_prefixlen) 3156 BUG(); 3157 3158 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3159 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3160 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3161 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3162 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3163 pol->sadb_x_policy_reserved = 0; 3164 pol->sadb_x_policy_id = xp->index; 3165 pol->sadb_x_policy_priority = xp->priority; 3166 3167 /* Set sadb_comb's. */ 3168 if (x->id.proto == IPPROTO_AH) 3169 dump_ah_combs(skb, t); 3170 else if (x->id.proto == IPPROTO_ESP) 3171 dump_esp_combs(skb, t); 3172 3173 /* security context */ 3174 if (xfrm_ctx) { 3175 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3176 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3177 sec_ctx->sadb_x_sec_len = 3178 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3179 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3180 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3181 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3182 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3183 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3184 xfrm_ctx->ctx_len); 3185 } 3186 3187 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3188 } 3189 3190 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3191 u8 *data, int len, int *dir) 3192 { 3193 struct net *net = sock_net(sk); 3194 struct xfrm_policy *xp; 3195 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3196 struct sadb_x_sec_ctx *sec_ctx; 3197 3198 switch (sk->sk_family) { 3199 case AF_INET: 3200 if (opt != IP_IPSEC_POLICY) { 3201 *dir = -EOPNOTSUPP; 3202 return NULL; 3203 } 3204 break; 3205 #if IS_ENABLED(CONFIG_IPV6) 3206 case AF_INET6: 3207 if (opt != IPV6_IPSEC_POLICY) { 3208 *dir = -EOPNOTSUPP; 3209 return NULL; 3210 } 3211 break; 3212 #endif 3213 default: 3214 *dir = -EINVAL; 3215 return NULL; 3216 } 3217 3218 *dir = -EINVAL; 3219 3220 if (len < sizeof(struct sadb_x_policy) || 3221 pol->sadb_x_policy_len*8 > len || 3222 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3223 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3224 return NULL; 3225 3226 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3227 if (xp == NULL) { 3228 *dir = -ENOBUFS; 3229 return NULL; 3230 } 3231 3232 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3233 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3234 3235 xp->lft.soft_byte_limit = XFRM_INF; 3236 xp->lft.hard_byte_limit = XFRM_INF; 3237 xp->lft.soft_packet_limit = XFRM_INF; 3238 xp->lft.hard_packet_limit = XFRM_INF; 3239 xp->family = sk->sk_family; 3240 3241 xp->xfrm_nr = 0; 3242 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3243 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3244 goto out; 3245 3246 /* security context too */ 3247 if (len >= (pol->sadb_x_policy_len*8 + 3248 sizeof(struct sadb_x_sec_ctx))) { 3249 char *p = (char *)pol; 3250 struct xfrm_user_sec_ctx *uctx; 3251 3252 p += pol->sadb_x_policy_len*8; 3253 sec_ctx = (struct sadb_x_sec_ctx *)p; 3254 if (len < pol->sadb_x_policy_len*8 + 3255 sec_ctx->sadb_x_sec_len) { 3256 *dir = -EINVAL; 3257 goto out; 3258 } 3259 if ((*dir = verify_sec_ctx_len(p))) 3260 goto out; 3261 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3262 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3263 kfree(uctx); 3264 3265 if (*dir) 3266 goto out; 3267 } 3268 3269 *dir = pol->sadb_x_policy_dir-1; 3270 return xp; 3271 3272 out: 3273 xp->walk.dead = 1; 3274 xfrm_policy_destroy(xp); 3275 return NULL; 3276 } 3277 3278 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3279 { 3280 struct sk_buff *skb; 3281 struct sadb_msg *hdr; 3282 struct sadb_sa *sa; 3283 struct sadb_address *addr; 3284 struct sadb_x_nat_t_port *n_port; 3285 int sockaddr_size; 3286 int size; 3287 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3288 struct xfrm_encap_tmpl *natt = NULL; 3289 3290 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3291 if (!sockaddr_size) 3292 return -EINVAL; 3293 3294 if (!satype) 3295 return -EINVAL; 3296 3297 if (!x->encap) 3298 return -EINVAL; 3299 3300 natt = x->encap; 3301 3302 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3303 * 3304 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3305 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3306 */ 3307 3308 size = sizeof(struct sadb_msg) + 3309 sizeof(struct sadb_sa) + 3310 (sizeof(struct sadb_address) * 2) + 3311 (sockaddr_size * 2) + 3312 (sizeof(struct sadb_x_nat_t_port) * 2); 3313 3314 skb = alloc_skb(size + 16, GFP_ATOMIC); 3315 if (skb == NULL) 3316 return -ENOMEM; 3317 3318 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3319 hdr->sadb_msg_version = PF_KEY_V2; 3320 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3321 hdr->sadb_msg_satype = satype; 3322 hdr->sadb_msg_len = size / sizeof(uint64_t); 3323 hdr->sadb_msg_errno = 0; 3324 hdr->sadb_msg_reserved = 0; 3325 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3326 hdr->sadb_msg_pid = 0; 3327 3328 /* SA */ 3329 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3330 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3331 sa->sadb_sa_exttype = SADB_EXT_SA; 3332 sa->sadb_sa_spi = x->id.spi; 3333 sa->sadb_sa_replay = 0; 3334 sa->sadb_sa_state = 0; 3335 sa->sadb_sa_auth = 0; 3336 sa->sadb_sa_encrypt = 0; 3337 sa->sadb_sa_flags = 0; 3338 3339 /* ADDRESS_SRC (old addr) */ 3340 addr = (struct sadb_address*) 3341 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3342 addr->sadb_address_len = 3343 (sizeof(struct sadb_address)+sockaddr_size)/ 3344 sizeof(uint64_t); 3345 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3346 addr->sadb_address_proto = 0; 3347 addr->sadb_address_reserved = 0; 3348 addr->sadb_address_prefixlen = 3349 pfkey_sockaddr_fill(&x->props.saddr, 0, 3350 (struct sockaddr *) (addr + 1), 3351 x->props.family); 3352 if (!addr->sadb_address_prefixlen) 3353 BUG(); 3354 3355 /* NAT_T_SPORT (old port) */ 3356 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3357 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3358 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3359 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3360 n_port->sadb_x_nat_t_port_reserved = 0; 3361 3362 /* ADDRESS_DST (new addr) */ 3363 addr = (struct sadb_address*) 3364 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3365 addr->sadb_address_len = 3366 (sizeof(struct sadb_address)+sockaddr_size)/ 3367 sizeof(uint64_t); 3368 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3369 addr->sadb_address_proto = 0; 3370 addr->sadb_address_reserved = 0; 3371 addr->sadb_address_prefixlen = 3372 pfkey_sockaddr_fill(ipaddr, 0, 3373 (struct sockaddr *) (addr + 1), 3374 x->props.family); 3375 if (!addr->sadb_address_prefixlen) 3376 BUG(); 3377 3378 /* NAT_T_DPORT (new port) */ 3379 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3380 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3381 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3382 n_port->sadb_x_nat_t_port_port = sport; 3383 n_port->sadb_x_nat_t_port_reserved = 0; 3384 3385 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3386 } 3387 3388 #ifdef CONFIG_NET_KEY_MIGRATE 3389 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3390 const struct xfrm_selector *sel) 3391 { 3392 struct sadb_address *addr; 3393 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3394 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3395 addr->sadb_address_exttype = type; 3396 addr->sadb_address_proto = sel->proto; 3397 addr->sadb_address_reserved = 0; 3398 3399 switch (type) { 3400 case SADB_EXT_ADDRESS_SRC: 3401 addr->sadb_address_prefixlen = sel->prefixlen_s; 3402 pfkey_sockaddr_fill(&sel->saddr, 0, 3403 (struct sockaddr *)(addr + 1), 3404 sel->family); 3405 break; 3406 case SADB_EXT_ADDRESS_DST: 3407 addr->sadb_address_prefixlen = sel->prefixlen_d; 3408 pfkey_sockaddr_fill(&sel->daddr, 0, 3409 (struct sockaddr *)(addr + 1), 3410 sel->family); 3411 break; 3412 default: 3413 return -EINVAL; 3414 } 3415 3416 return 0; 3417 } 3418 3419 3420 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3421 { 3422 struct sadb_x_kmaddress *kma; 3423 u8 *sa; 3424 int family = k->family; 3425 int socklen = pfkey_sockaddr_len(family); 3426 int size_req; 3427 3428 size_req = (sizeof(struct sadb_x_kmaddress) + 3429 pfkey_sockaddr_pair_size(family)); 3430 3431 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3432 memset(kma, 0, size_req); 3433 kma->sadb_x_kmaddress_len = size_req / 8; 3434 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3435 kma->sadb_x_kmaddress_reserved = k->reserved; 3436 3437 sa = (u8 *)(kma + 1); 3438 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3439 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3440 return -EINVAL; 3441 3442 return 0; 3443 } 3444 3445 static int set_ipsecrequest(struct sk_buff *skb, 3446 uint8_t proto, uint8_t mode, int level, 3447 uint32_t reqid, uint8_t family, 3448 const xfrm_address_t *src, const xfrm_address_t *dst) 3449 { 3450 struct sadb_x_ipsecrequest *rq; 3451 u8 *sa; 3452 int socklen = pfkey_sockaddr_len(family); 3453 int size_req; 3454 3455 size_req = sizeof(struct sadb_x_ipsecrequest) + 3456 pfkey_sockaddr_pair_size(family); 3457 3458 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3459 memset(rq, 0, size_req); 3460 rq->sadb_x_ipsecrequest_len = size_req; 3461 rq->sadb_x_ipsecrequest_proto = proto; 3462 rq->sadb_x_ipsecrequest_mode = mode; 3463 rq->sadb_x_ipsecrequest_level = level; 3464 rq->sadb_x_ipsecrequest_reqid = reqid; 3465 3466 sa = (u8 *) (rq + 1); 3467 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3468 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3469 return -EINVAL; 3470 3471 return 0; 3472 } 3473 #endif 3474 3475 #ifdef CONFIG_NET_KEY_MIGRATE 3476 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3477 const struct xfrm_migrate *m, int num_bundles, 3478 const struct xfrm_kmaddress *k) 3479 { 3480 int i; 3481 int sasize_sel; 3482 int size = 0; 3483 int size_pol = 0; 3484 struct sk_buff *skb; 3485 struct sadb_msg *hdr; 3486 struct sadb_x_policy *pol; 3487 const struct xfrm_migrate *mp; 3488 3489 if (type != XFRM_POLICY_TYPE_MAIN) 3490 return 0; 3491 3492 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3493 return -EINVAL; 3494 3495 if (k != NULL) { 3496 /* addresses for KM */ 3497 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3498 pfkey_sockaddr_pair_size(k->family)); 3499 } 3500 3501 /* selector */ 3502 sasize_sel = pfkey_sockaddr_size(sel->family); 3503 if (!sasize_sel) 3504 return -EINVAL; 3505 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3506 3507 /* policy info */ 3508 size_pol += sizeof(struct sadb_x_policy); 3509 3510 /* ipsecrequests */ 3511 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3512 /* old locator pair */ 3513 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3514 pfkey_sockaddr_pair_size(mp->old_family); 3515 /* new locator pair */ 3516 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3517 pfkey_sockaddr_pair_size(mp->new_family); 3518 } 3519 3520 size += sizeof(struct sadb_msg) + size_pol; 3521 3522 /* alloc buffer */ 3523 skb = alloc_skb(size, GFP_ATOMIC); 3524 if (skb == NULL) 3525 return -ENOMEM; 3526 3527 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3528 hdr->sadb_msg_version = PF_KEY_V2; 3529 hdr->sadb_msg_type = SADB_X_MIGRATE; 3530 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3531 hdr->sadb_msg_len = size / 8; 3532 hdr->sadb_msg_errno = 0; 3533 hdr->sadb_msg_reserved = 0; 3534 hdr->sadb_msg_seq = 0; 3535 hdr->sadb_msg_pid = 0; 3536 3537 /* Addresses to be used by KM for negotiation, if ext is available */ 3538 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3539 goto err; 3540 3541 /* selector src */ 3542 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3543 3544 /* selector dst */ 3545 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3546 3547 /* policy information */ 3548 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3549 pol->sadb_x_policy_len = size_pol / 8; 3550 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3551 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3552 pol->sadb_x_policy_dir = dir + 1; 3553 pol->sadb_x_policy_reserved = 0; 3554 pol->sadb_x_policy_id = 0; 3555 pol->sadb_x_policy_priority = 0; 3556 3557 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3558 /* old ipsecrequest */ 3559 int mode = pfkey_mode_from_xfrm(mp->mode); 3560 if (mode < 0) 3561 goto err; 3562 if (set_ipsecrequest(skb, mp->proto, mode, 3563 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3564 mp->reqid, mp->old_family, 3565 &mp->old_saddr, &mp->old_daddr) < 0) 3566 goto err; 3567 3568 /* new ipsecrequest */ 3569 if (set_ipsecrequest(skb, mp->proto, mode, 3570 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3571 mp->reqid, mp->new_family, 3572 &mp->new_saddr, &mp->new_daddr) < 0) 3573 goto err; 3574 } 3575 3576 /* broadcast migrate message to sockets */ 3577 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3578 3579 return 0; 3580 3581 err: 3582 kfree_skb(skb); 3583 return -EINVAL; 3584 } 3585 #else 3586 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3587 const struct xfrm_migrate *m, int num_bundles, 3588 const struct xfrm_kmaddress *k) 3589 { 3590 return -ENOPROTOOPT; 3591 } 3592 #endif 3593 3594 static int pfkey_sendmsg(struct kiocb *kiocb, 3595 struct socket *sock, struct msghdr *msg, size_t len) 3596 { 3597 struct sock *sk = sock->sk; 3598 struct sk_buff *skb = NULL; 3599 struct sadb_msg *hdr = NULL; 3600 int err; 3601 struct net *net = sock_net(sk); 3602 3603 err = -EOPNOTSUPP; 3604 if (msg->msg_flags & MSG_OOB) 3605 goto out; 3606 3607 err = -EMSGSIZE; 3608 if ((unsigned int)len > sk->sk_sndbuf - 32) 3609 goto out; 3610 3611 err = -ENOBUFS; 3612 skb = alloc_skb(len, GFP_KERNEL); 3613 if (skb == NULL) 3614 goto out; 3615 3616 err = -EFAULT; 3617 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3618 goto out; 3619 3620 hdr = pfkey_get_base_msg(skb, &err); 3621 if (!hdr) 3622 goto out; 3623 3624 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3625 err = pfkey_process(sk, skb, hdr); 3626 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3627 3628 out: 3629 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3630 err = 0; 3631 kfree_skb(skb); 3632 3633 return err ? : len; 3634 } 3635 3636 static int pfkey_recvmsg(struct kiocb *kiocb, 3637 struct socket *sock, struct msghdr *msg, size_t len, 3638 int flags) 3639 { 3640 struct sock *sk = sock->sk; 3641 struct pfkey_sock *pfk = pfkey_sk(sk); 3642 struct sk_buff *skb; 3643 int copied, err; 3644 3645 err = -EINVAL; 3646 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3647 goto out; 3648 3649 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3650 if (skb == NULL) 3651 goto out; 3652 3653 copied = skb->len; 3654 if (copied > len) { 3655 msg->msg_flags |= MSG_TRUNC; 3656 copied = len; 3657 } 3658 3659 skb_reset_transport_header(skb); 3660 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3661 if (err) 3662 goto out_free; 3663 3664 sock_recv_ts_and_drops(msg, sk, skb); 3665 3666 err = (flags & MSG_TRUNC) ? skb->len : copied; 3667 3668 if (pfk->dump.dump != NULL && 3669 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3670 pfkey_do_dump(pfk); 3671 3672 out_free: 3673 skb_free_datagram(sk, skb); 3674 out: 3675 return err; 3676 } 3677 3678 static const struct proto_ops pfkey_ops = { 3679 .family = PF_KEY, 3680 .owner = THIS_MODULE, 3681 /* Operations that make no sense on pfkey sockets. */ 3682 .bind = sock_no_bind, 3683 .connect = sock_no_connect, 3684 .socketpair = sock_no_socketpair, 3685 .accept = sock_no_accept, 3686 .getname = sock_no_getname, 3687 .ioctl = sock_no_ioctl, 3688 .listen = sock_no_listen, 3689 .shutdown = sock_no_shutdown, 3690 .setsockopt = sock_no_setsockopt, 3691 .getsockopt = sock_no_getsockopt, 3692 .mmap = sock_no_mmap, 3693 .sendpage = sock_no_sendpage, 3694 3695 /* Now the operations that really occur. */ 3696 .release = pfkey_release, 3697 .poll = datagram_poll, 3698 .sendmsg = pfkey_sendmsg, 3699 .recvmsg = pfkey_recvmsg, 3700 }; 3701 3702 static const struct net_proto_family pfkey_family_ops = { 3703 .family = PF_KEY, 3704 .create = pfkey_create, 3705 .owner = THIS_MODULE, 3706 }; 3707 3708 #ifdef CONFIG_PROC_FS 3709 static int pfkey_seq_show(struct seq_file *f, void *v) 3710 { 3711 struct sock *s = sk_entry(v); 3712 3713 if (v == SEQ_START_TOKEN) 3714 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3715 else 3716 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3717 s, 3718 atomic_read(&s->sk_refcnt), 3719 sk_rmem_alloc_get(s), 3720 sk_wmem_alloc_get(s), 3721 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3722 sock_i_ino(s) 3723 ); 3724 return 0; 3725 } 3726 3727 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3728 __acquires(rcu) 3729 { 3730 struct net *net = seq_file_net(f); 3731 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3732 3733 rcu_read_lock(); 3734 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3735 } 3736 3737 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3738 { 3739 struct net *net = seq_file_net(f); 3740 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3741 3742 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3743 } 3744 3745 static void pfkey_seq_stop(struct seq_file *f, void *v) 3746 __releases(rcu) 3747 { 3748 rcu_read_unlock(); 3749 } 3750 3751 static const struct seq_operations pfkey_seq_ops = { 3752 .start = pfkey_seq_start, 3753 .next = pfkey_seq_next, 3754 .stop = pfkey_seq_stop, 3755 .show = pfkey_seq_show, 3756 }; 3757 3758 static int pfkey_seq_open(struct inode *inode, struct file *file) 3759 { 3760 return seq_open_net(inode, file, &pfkey_seq_ops, 3761 sizeof(struct seq_net_private)); 3762 } 3763 3764 static const struct file_operations pfkey_proc_ops = { 3765 .open = pfkey_seq_open, 3766 .read = seq_read, 3767 .llseek = seq_lseek, 3768 .release = seq_release_net, 3769 }; 3770 3771 static int __net_init pfkey_init_proc(struct net *net) 3772 { 3773 struct proc_dir_entry *e; 3774 3775 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3776 if (e == NULL) 3777 return -ENOMEM; 3778 3779 return 0; 3780 } 3781 3782 static void __net_exit pfkey_exit_proc(struct net *net) 3783 { 3784 remove_proc_entry("pfkey", net->proc_net); 3785 } 3786 #else 3787 static inline int pfkey_init_proc(struct net *net) 3788 { 3789 return 0; 3790 } 3791 3792 static inline void pfkey_exit_proc(struct net *net) 3793 { 3794 } 3795 #endif 3796 3797 static struct xfrm_mgr pfkeyv2_mgr = 3798 { 3799 .id = "pfkeyv2", 3800 .notify = pfkey_send_notify, 3801 .acquire = pfkey_send_acquire, 3802 .compile_policy = pfkey_compile_policy, 3803 .new_mapping = pfkey_send_new_mapping, 3804 .notify_policy = pfkey_send_policy_notify, 3805 .migrate = pfkey_send_migrate, 3806 .is_alive = pfkey_is_alive, 3807 }; 3808 3809 static int __net_init pfkey_net_init(struct net *net) 3810 { 3811 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3812 int rv; 3813 3814 INIT_HLIST_HEAD(&net_pfkey->table); 3815 atomic_set(&net_pfkey->socks_nr, 0); 3816 3817 rv = pfkey_init_proc(net); 3818 3819 return rv; 3820 } 3821 3822 static void __net_exit pfkey_net_exit(struct net *net) 3823 { 3824 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3825 3826 pfkey_exit_proc(net); 3827 BUG_ON(!hlist_empty(&net_pfkey->table)); 3828 } 3829 3830 static struct pernet_operations pfkey_net_ops = { 3831 .init = pfkey_net_init, 3832 .exit = pfkey_net_exit, 3833 .id = &pfkey_net_id, 3834 .size = sizeof(struct netns_pfkey), 3835 }; 3836 3837 static void __exit ipsec_pfkey_exit(void) 3838 { 3839 xfrm_unregister_km(&pfkeyv2_mgr); 3840 sock_unregister(PF_KEY); 3841 unregister_pernet_subsys(&pfkey_net_ops); 3842 proto_unregister(&key_proto); 3843 } 3844 3845 static int __init ipsec_pfkey_init(void) 3846 { 3847 int err = proto_register(&key_proto, 0); 3848 3849 if (err != 0) 3850 goto out; 3851 3852 err = register_pernet_subsys(&pfkey_net_ops); 3853 if (err != 0) 3854 goto out_unregister_key_proto; 3855 err = sock_register(&pfkey_family_ops); 3856 if (err != 0) 3857 goto out_unregister_pernet; 3858 err = xfrm_register_km(&pfkeyv2_mgr); 3859 if (err != 0) 3860 goto out_sock_unregister; 3861 out: 3862 return err; 3863 3864 out_sock_unregister: 3865 sock_unregister(PF_KEY); 3866 out_unregister_pernet: 3867 unregister_pernet_subsys(&pfkey_net_ops); 3868 out_unregister_key_proto: 3869 proto_unregister(&key_proto); 3870 goto out; 3871 } 3872 3873 module_init(ipsec_pfkey_init); 3874 module_exit(ipsec_pfkey_exit); 3875 MODULE_LICENSE("GPL"); 3876 MODULE_ALIAS_NETPROTO(PF_KEY); 3877