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