1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 4 * 5 * Authors: Maxim Giryaev <gem@asplinux.ru> 6 * David S. Miller <davem@redhat.com> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 9 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 10 * Derek Atkins <derek@ihtfp.com> 11 */ 12 13#include <linux/capability.h> 14#include <linux/module.h> 15#include <linux/kernel.h> 16#include <linux/socket.h> 17#include <linux/pfkeyv2.h> 18#include <linux/ipsec.h> 19#include <linux/skbuff.h> 20#include <linux/rtnetlink.h> 21#include <linux/in.h> 22#include <linux/in6.h> 23#include <linux/proc_fs.h> 24#include <linux/init.h> 25#include <linux/slab.h> 26#include <net/net_namespace.h> 27#include <net/netns/generic.h> 28#include <net/xfrm.h> 29 30#include <net/sock.h> 31 32#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 33#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 34 35static unsigned int pfkey_net_id __read_mostly; 36struct netns_pfkey { 37 /* List of all pfkey sockets. */ 38 struct hlist_head table; 39 atomic_t socks_nr; 40}; 41static DEFINE_MUTEX(pfkey_mutex); 42 43#define DUMMY_MARK 0 44static const struct xfrm_mark dummy_mark = {0, 0}; 45struct pfkey_sock { 46 /* struct sock must be the first member of struct pfkey_sock */ 47 struct sock sk; 48 int registered; 49 int promisc; 50 51 struct { 52 uint8_t msg_version; 53 uint32_t msg_portid; 54 int (*dump)(struct pfkey_sock *sk); 55 void (*done)(struct pfkey_sock *sk); 56 union { 57 struct xfrm_policy_walk policy; 58 struct xfrm_state_walk state; 59 } u; 60 struct sk_buff *skb; 61 } dump; 62 struct mutex dump_lock; 63}; 64 65static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 66 xfrm_address_t *saddr, xfrm_address_t *daddr, 67 u16 *family); 68 69static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 70{ 71 return (struct pfkey_sock *)sk; 72} 73 74static int pfkey_can_dump(const struct sock *sk) 75{ 76 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 77 return 1; 78 return 0; 79} 80 81static void pfkey_terminate_dump(struct pfkey_sock *pfk) 82{ 83 if (pfk->dump.dump) { 84 if (pfk->dump.skb) { 85 kfree_skb(pfk->dump.skb); 86 pfk->dump.skb = NULL; 87 } 88 pfk->dump.done(pfk); 89 pfk->dump.dump = NULL; 90 pfk->dump.done = NULL; 91 } 92} 93 94static void pfkey_sock_destruct(struct sock *sk) 95{ 96 struct net *net = sock_net(sk); 97 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 98 99 pfkey_terminate_dump(pfkey_sk(sk)); 100 skb_queue_purge(&sk->sk_receive_queue); 101 102 if (!sock_flag(sk, SOCK_DEAD)) { 103 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 104 return; 105 } 106 107 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 108 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 109 110 atomic_dec(&net_pfkey->socks_nr); 111} 112 113static const struct proto_ops pfkey_ops; 114 115static void pfkey_insert(struct sock *sk) 116{ 117 struct net *net = sock_net(sk); 118 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 119 120 mutex_lock(&pfkey_mutex); 121 sk_add_node_rcu(sk, &net_pfkey->table); 122 mutex_unlock(&pfkey_mutex); 123} 124 125static void pfkey_remove(struct sock *sk) 126{ 127 mutex_lock(&pfkey_mutex); 128 sk_del_node_init_rcu(sk); 129 mutex_unlock(&pfkey_mutex); 130} 131 132static struct proto key_proto = { 133 .name = "KEY", 134 .owner = THIS_MODULE, 135 .obj_size = sizeof(struct pfkey_sock), 136}; 137 138static int pfkey_create(struct net *net, struct socket *sock, int protocol, 139 int kern) 140{ 141 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 142 struct sock *sk; 143 struct pfkey_sock *pfk; 144 int err; 145 146 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 147 return -EPERM; 148 if (sock->type != SOCK_RAW) 149 return -ESOCKTNOSUPPORT; 150 if (protocol != PF_KEY_V2) 151 return -EPROTONOSUPPORT; 152 153 err = -ENOMEM; 154 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 155 if (sk == NULL) 156 goto out; 157 158 pfk = pfkey_sk(sk); 159 mutex_init(&pfk->dump_lock); 160 161 sock->ops = &pfkey_ops; 162 sock_init_data(sock, sk); 163 164 sk->sk_family = PF_KEY; 165 sk->sk_destruct = pfkey_sock_destruct; 166 167 atomic_inc(&net_pfkey->socks_nr); 168 169 pfkey_insert(sk); 170 171 return 0; 172out: 173 return err; 174} 175 176static int pfkey_release(struct socket *sock) 177{ 178 struct sock *sk = sock->sk; 179 180 if (!sk) 181 return 0; 182 183 pfkey_remove(sk); 184 185 sock_orphan(sk); 186 sock->sk = NULL; 187 skb_queue_purge(&sk->sk_write_queue); 188 189 synchronize_rcu(); 190 sock_put(sk); 191 192 return 0; 193} 194 195static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 196 struct sock *sk) 197{ 198 int err = -ENOBUFS; 199 200 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 201 return err; 202 203 skb = skb_clone(skb, allocation); 204 205 if (skb) { 206 skb_set_owner_r(skb, sk); 207 skb_queue_tail(&sk->sk_receive_queue, skb); 208 sk->sk_data_ready(sk); 209 err = 0; 210 } 211 return err; 212} 213 214/* Send SKB to all pfkey sockets matching selected criteria. */ 215#define BROADCAST_ALL 0 216#define BROADCAST_ONE 1 217#define BROADCAST_REGISTERED 2 218#define BROADCAST_PROMISC_ONLY 4 219static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 220 int broadcast_flags, struct sock *one_sk, 221 struct net *net) 222{ 223 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 224 struct sock *sk; 225 int err = -ESRCH; 226 227 /* XXX Do we need something like netlink_overrun? I think 228 * XXX PF_KEY socket apps will not mind current behavior. 229 */ 230 if (!skb) 231 return -ENOMEM; 232 233 rcu_read_lock(); 234 sk_for_each_rcu(sk, &net_pfkey->table) { 235 struct pfkey_sock *pfk = pfkey_sk(sk); 236 int err2; 237 238 /* Yes, it means that if you are meant to receive this 239 * pfkey message you receive it twice as promiscuous 240 * socket. 241 */ 242 if (pfk->promisc) 243 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 244 245 /* the exact target will be processed later */ 246 if (sk == one_sk) 247 continue; 248 if (broadcast_flags != BROADCAST_ALL) { 249 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 250 continue; 251 if ((broadcast_flags & BROADCAST_REGISTERED) && 252 !pfk->registered) 253 continue; 254 if (broadcast_flags & BROADCAST_ONE) 255 continue; 256 } 257 258 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 259 260 /* Error is cleared after successful sending to at least one 261 * registered KM */ 262 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 263 err = err2; 264 } 265 rcu_read_unlock(); 266 267 if (one_sk != NULL) 268 err = pfkey_broadcast_one(skb, allocation, one_sk); 269 270 kfree_skb(skb); 271 return err; 272} 273 274static int pfkey_do_dump(struct pfkey_sock *pfk) 275{ 276 struct sadb_msg *hdr; 277 int rc; 278 279 mutex_lock(&pfk->dump_lock); 280 if (!pfk->dump.dump) { 281 rc = 0; 282 goto out; 283 } 284 285 rc = pfk->dump.dump(pfk); 286 if (rc == -ENOBUFS) { 287 rc = 0; 288 goto out; 289 } 290 291 if (pfk->dump.skb) { 292 if (!pfkey_can_dump(&pfk->sk)) { 293 rc = 0; 294 goto out; 295 } 296 297 hdr = (struct sadb_msg *) pfk->dump.skb->data; 298 hdr->sadb_msg_seq = 0; 299 hdr->sadb_msg_errno = rc; 300 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 301 &pfk->sk, sock_net(&pfk->sk)); 302 pfk->dump.skb = NULL; 303 } 304 305 pfkey_terminate_dump(pfk); 306 307out: 308 mutex_unlock(&pfk->dump_lock); 309 return rc; 310} 311 312static inline void pfkey_hdr_dup(struct sadb_msg *new, 313 const struct sadb_msg *orig) 314{ 315 *new = *orig; 316} 317 318static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 319{ 320 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 321 struct sadb_msg *hdr; 322 323 if (!skb) 324 return -ENOBUFS; 325 326 /* Woe be to the platform trying to support PFKEY yet 327 * having normal errnos outside the 1-255 range, inclusive. 328 */ 329 err = -err; 330 if (err == ERESTARTSYS || 331 err == ERESTARTNOHAND || 332 err == ERESTARTNOINTR) 333 err = EINTR; 334 if (err >= 512) 335 err = EINVAL; 336 BUG_ON(err <= 0 || err >= 256); 337 338 hdr = skb_put(skb, sizeof(struct sadb_msg)); 339 pfkey_hdr_dup(hdr, orig); 340 hdr->sadb_msg_errno = (uint8_t) err; 341 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 342 sizeof(uint64_t)); 343 344 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 345 346 return 0; 347} 348 349static const u8 sadb_ext_min_len[] = { 350 [SADB_EXT_RESERVED] = (u8) 0, 351 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 352 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 353 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 354 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 355 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 356 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 357 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 358 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 359 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 360 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 361 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 362 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 363 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 364 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 365 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 366 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 367 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 368 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 369 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 370 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 371 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 372 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 373 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 374 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 375 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 376 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 377}; 378 379/* Verify sadb_address_{len,prefixlen} against sa_family. */ 380static int verify_address_len(const void *p) 381{ 382 const struct sadb_address *sp = p; 383 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 384 const struct sockaddr_in *sin; 385#if IS_ENABLED(CONFIG_IPV6) 386 const struct sockaddr_in6 *sin6; 387#endif 388 int len; 389 390 if (sp->sadb_address_len < 391 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 392 sizeof(uint64_t))) 393 return -EINVAL; 394 395 switch (addr->sa_family) { 396 case AF_INET: 397 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 398 if (sp->sadb_address_len != len || 399 sp->sadb_address_prefixlen > 32) 400 return -EINVAL; 401 break; 402#if IS_ENABLED(CONFIG_IPV6) 403 case AF_INET6: 404 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 405 if (sp->sadb_address_len != len || 406 sp->sadb_address_prefixlen > 128) 407 return -EINVAL; 408 break; 409#endif 410 default: 411 /* It is user using kernel to keep track of security 412 * associations for another protocol, such as 413 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 414 * lengths. 415 * 416 * XXX Actually, association/policy database is not yet 417 * XXX able to cope with arbitrary sockaddr families. 418 * XXX When it can, remove this -EINVAL. -DaveM 419 */ 420 return -EINVAL; 421 } 422 423 return 0; 424} 425 426static inline int sadb_key_len(const struct sadb_key *key) 427{ 428 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 429 430 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 431 sizeof(uint64_t)); 432} 433 434static int verify_key_len(const void *p) 435{ 436 const struct sadb_key *key = p; 437 438 if (sadb_key_len(key) > key->sadb_key_len) 439 return -EINVAL; 440 441 return 0; 442} 443 444static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 445{ 446 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 447 sec_ctx->sadb_x_ctx_len, 448 sizeof(uint64_t)); 449} 450 451static inline int verify_sec_ctx_len(const void *p) 452{ 453 const struct sadb_x_sec_ctx *sec_ctx = p; 454 int len = sec_ctx->sadb_x_ctx_len; 455 456 if (len > PAGE_SIZE) 457 return -EINVAL; 458 459 len = pfkey_sec_ctx_len(sec_ctx); 460 461 if (sec_ctx->sadb_x_sec_len != len) 462 return -EINVAL; 463 464 return 0; 465} 466 467static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 468 gfp_t gfp) 469{ 470 struct xfrm_user_sec_ctx *uctx = NULL; 471 int ctx_size = sec_ctx->sadb_x_ctx_len; 472 473 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 474 475 if (!uctx) 476 return NULL; 477 478 uctx->len = pfkey_sec_ctx_len(sec_ctx); 479 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 480 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 481 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 482 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 483 memcpy(uctx + 1, sec_ctx + 1, 484 uctx->ctx_len); 485 486 return uctx; 487} 488 489static int present_and_same_family(const struct sadb_address *src, 490 const struct sadb_address *dst) 491{ 492 const struct sockaddr *s_addr, *d_addr; 493 494 if (!src || !dst) 495 return 0; 496 497 s_addr = (const struct sockaddr *)(src + 1); 498 d_addr = (const struct sockaddr *)(dst + 1); 499 if (s_addr->sa_family != d_addr->sa_family) 500 return 0; 501 if (s_addr->sa_family != AF_INET 502#if IS_ENABLED(CONFIG_IPV6) 503 && s_addr->sa_family != AF_INET6 504#endif 505 ) 506 return 0; 507 508 return 1; 509} 510 511static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 512{ 513 const char *p = (char *) hdr; 514 int len = skb->len; 515 516 len -= sizeof(*hdr); 517 p += sizeof(*hdr); 518 while (len > 0) { 519 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 520 uint16_t ext_type; 521 int ext_len; 522 523 if (len < sizeof(*ehdr)) 524 return -EINVAL; 525 526 ext_len = ehdr->sadb_ext_len; 527 ext_len *= sizeof(uint64_t); 528 ext_type = ehdr->sadb_ext_type; 529 if (ext_len < sizeof(uint64_t) || 530 ext_len > len || 531 ext_type == SADB_EXT_RESERVED) 532 return -EINVAL; 533 534 if (ext_type <= SADB_EXT_MAX) { 535 int min = (int) sadb_ext_min_len[ext_type]; 536 if (ext_len < min) 537 return -EINVAL; 538 if (ext_hdrs[ext_type-1] != NULL) 539 return -EINVAL; 540 switch (ext_type) { 541 case SADB_EXT_ADDRESS_SRC: 542 case SADB_EXT_ADDRESS_DST: 543 case SADB_EXT_ADDRESS_PROXY: 544 case SADB_X_EXT_NAT_T_OA: 545 if (verify_address_len(p)) 546 return -EINVAL; 547 break; 548 case SADB_X_EXT_SEC_CTX: 549 if (verify_sec_ctx_len(p)) 550 return -EINVAL; 551 break; 552 case SADB_EXT_KEY_AUTH: 553 case SADB_EXT_KEY_ENCRYPT: 554 if (verify_key_len(p)) 555 return -EINVAL; 556 break; 557 default: 558 break; 559 } 560 ext_hdrs[ext_type-1] = (void *) p; 561 } 562 p += ext_len; 563 len -= ext_len; 564 } 565 566 return 0; 567} 568 569static uint16_t 570pfkey_satype2proto(uint8_t satype) 571{ 572 switch (satype) { 573 case SADB_SATYPE_UNSPEC: 574 return IPSEC_PROTO_ANY; 575 case SADB_SATYPE_AH: 576 return IPPROTO_AH; 577 case SADB_SATYPE_ESP: 578 return IPPROTO_ESP; 579 case SADB_X_SATYPE_IPCOMP: 580 return IPPROTO_COMP; 581 default: 582 return 0; 583 } 584 /* NOTREACHED */ 585} 586 587static uint8_t 588pfkey_proto2satype(uint16_t proto) 589{ 590 switch (proto) { 591 case IPPROTO_AH: 592 return SADB_SATYPE_AH; 593 case IPPROTO_ESP: 594 return SADB_SATYPE_ESP; 595 case IPPROTO_COMP: 596 return SADB_X_SATYPE_IPCOMP; 597 default: 598 return 0; 599 } 600 /* NOTREACHED */ 601} 602 603/* BTW, this scheme means that there is no way with PFKEY2 sockets to 604 * say specifically 'just raw sockets' as we encode them as 255. 605 */ 606 607static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 608{ 609 return proto == IPSEC_PROTO_ANY ? 0 : proto; 610} 611 612static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 613{ 614 return proto ? proto : IPSEC_PROTO_ANY; 615} 616 617static inline int pfkey_sockaddr_len(sa_family_t family) 618{ 619 switch (family) { 620 case AF_INET: 621 return sizeof(struct sockaddr_in); 622#if IS_ENABLED(CONFIG_IPV6) 623 case AF_INET6: 624 return sizeof(struct sockaddr_in6); 625#endif 626 } 627 return 0; 628} 629 630static 631int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 632{ 633 switch (sa->sa_family) { 634 case AF_INET: 635 xaddr->a4 = 636 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 637 return AF_INET; 638#if IS_ENABLED(CONFIG_IPV6) 639 case AF_INET6: 640 memcpy(xaddr->a6, 641 &((struct sockaddr_in6 *)sa)->sin6_addr, 642 sizeof(struct in6_addr)); 643 return AF_INET6; 644#endif 645 } 646 return 0; 647} 648 649static 650int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 651{ 652 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 653 xaddr); 654} 655 656static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 657{ 658 const struct sadb_sa *sa; 659 const struct sadb_address *addr; 660 uint16_t proto; 661 unsigned short family; 662 xfrm_address_t *xaddr; 663 664 sa = ext_hdrs[SADB_EXT_SA - 1]; 665 if (sa == NULL) 666 return NULL; 667 668 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 669 if (proto == 0) 670 return NULL; 671 672 /* sadb_address_len should be checked by caller */ 673 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 674 if (addr == NULL) 675 return NULL; 676 677 family = ((const struct sockaddr *)(addr + 1))->sa_family; 678 switch (family) { 679 case AF_INET: 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 681 break; 682#if IS_ENABLED(CONFIG_IPV6) 683 case AF_INET6: 684 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 685 break; 686#endif 687 default: 688 xaddr = NULL; 689 } 690 691 if (!xaddr) 692 return NULL; 693 694 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 695} 696 697#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 698 699static int 700pfkey_sockaddr_size(sa_family_t family) 701{ 702 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 703} 704 705static inline int pfkey_mode_from_xfrm(int mode) 706{ 707 switch(mode) { 708 case XFRM_MODE_TRANSPORT: 709 return IPSEC_MODE_TRANSPORT; 710 case XFRM_MODE_TUNNEL: 711 return IPSEC_MODE_TUNNEL; 712 case XFRM_MODE_BEET: 713 return IPSEC_MODE_BEET; 714 default: 715 return -1; 716 } 717} 718 719static inline int pfkey_mode_to_xfrm(int mode) 720{ 721 switch(mode) { 722 case IPSEC_MODE_ANY: /*XXX*/ 723 case IPSEC_MODE_TRANSPORT: 724 return XFRM_MODE_TRANSPORT; 725 case IPSEC_MODE_TUNNEL: 726 return XFRM_MODE_TUNNEL; 727 case IPSEC_MODE_BEET: 728 return XFRM_MODE_BEET; 729 default: 730 return -1; 731 } 732} 733 734static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 735 struct sockaddr *sa, 736 unsigned short family) 737{ 738 switch (family) { 739 case AF_INET: 740 { 741 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 742 sin->sin_family = AF_INET; 743 sin->sin_port = port; 744 sin->sin_addr.s_addr = xaddr->a4; 745 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 746 return 32; 747 } 748#if IS_ENABLED(CONFIG_IPV6) 749 case AF_INET6: 750 { 751 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 752 sin6->sin6_family = AF_INET6; 753 sin6->sin6_port = port; 754 sin6->sin6_flowinfo = 0; 755 sin6->sin6_addr = xaddr->in6; 756 sin6->sin6_scope_id = 0; 757 return 128; 758 } 759#endif 760 } 761 return 0; 762} 763 764static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 765 int add_keys, int hsc) 766{ 767 struct sk_buff *skb; 768 struct sadb_msg *hdr; 769 struct sadb_sa *sa; 770 struct sadb_lifetime *lifetime; 771 struct sadb_address *addr; 772 struct sadb_key *key; 773 struct sadb_x_sa2 *sa2; 774 struct sadb_x_sec_ctx *sec_ctx; 775 struct xfrm_sec_ctx *xfrm_ctx; 776 int ctx_size = 0; 777 int size; 778 int auth_key_size = 0; 779 int encrypt_key_size = 0; 780 int sockaddr_size; 781 struct xfrm_encap_tmpl *natt = NULL; 782 int mode; 783 784 /* address family check */ 785 sockaddr_size = pfkey_sockaddr_size(x->props.family); 786 if (!sockaddr_size) 787 return ERR_PTR(-EINVAL); 788 789 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 790 key(AE), (identity(SD),) (sensitivity)> */ 791 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 792 sizeof(struct sadb_lifetime) + 793 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 794 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 795 sizeof(struct sadb_address)*2 + 796 sockaddr_size*2 + 797 sizeof(struct sadb_x_sa2); 798 799 if ((xfrm_ctx = x->security)) { 800 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 801 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 802 } 803 804 /* identity & sensitivity */ 805 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 806 size += sizeof(struct sadb_address) + sockaddr_size; 807 808 if (add_keys) { 809 if (x->aalg && x->aalg->alg_key_len) { 810 auth_key_size = 811 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 812 size += sizeof(struct sadb_key) + auth_key_size; 813 } 814 if (x->ealg && x->ealg->alg_key_len) { 815 encrypt_key_size = 816 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 817 size += sizeof(struct sadb_key) + encrypt_key_size; 818 } 819 } 820 if (x->encap) 821 natt = x->encap; 822 823 if (natt && natt->encap_type) { 824 size += sizeof(struct sadb_x_nat_t_type); 825 size += sizeof(struct sadb_x_nat_t_port); 826 size += sizeof(struct sadb_x_nat_t_port); 827 } 828 829 skb = alloc_skb(size + 16, GFP_ATOMIC); 830 if (skb == NULL) 831 return ERR_PTR(-ENOBUFS); 832 833 /* call should fill header later */ 834 hdr = skb_put(skb, sizeof(struct sadb_msg)); 835 memset(hdr, 0, size); /* XXX do we need this ? */ 836 hdr->sadb_msg_len = size / sizeof(uint64_t); 837 838 /* sa */ 839 sa = skb_put(skb, sizeof(struct sadb_sa)); 840 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 841 sa->sadb_sa_exttype = SADB_EXT_SA; 842 sa->sadb_sa_spi = x->id.spi; 843 sa->sadb_sa_replay = x->props.replay_window; 844 switch (x->km.state) { 845 case XFRM_STATE_VALID: 846 sa->sadb_sa_state = x->km.dying ? 847 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 848 break; 849 case XFRM_STATE_ACQ: 850 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 851 break; 852 default: 853 sa->sadb_sa_state = SADB_SASTATE_DEAD; 854 break; 855 } 856 sa->sadb_sa_auth = 0; 857 if (x->aalg) { 858 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 859 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 860 a->desc.sadb_alg_id : 0; 861 } 862 sa->sadb_sa_encrypt = 0; 863 BUG_ON(x->ealg && x->calg); 864 if (x->ealg) { 865 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 866 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 867 a->desc.sadb_alg_id : 0; 868 } 869 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 870 if (x->calg) { 871 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 872 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 873 a->desc.sadb_alg_id : 0; 874 } 875 876 sa->sadb_sa_flags = 0; 877 if (x->props.flags & XFRM_STATE_NOECN) 878 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 879 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 880 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 881 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 882 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 883 884 /* hard time */ 885 if (hsc & 2) { 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_HARD; 890 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 891 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 892 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 893 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 894 } 895 /* soft time */ 896 if (hsc & 1) { 897 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 898 lifetime->sadb_lifetime_len = 899 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 900 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 901 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 902 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 903 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 904 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 905 } 906 /* current time */ 907 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 908 lifetime->sadb_lifetime_len = 909 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 910 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 911 lifetime->sadb_lifetime_allocations = x->curlft.packets; 912 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 913 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 914 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 915 /* src address */ 916 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 917 addr->sadb_address_len = 918 (sizeof(struct sadb_address)+sockaddr_size)/ 919 sizeof(uint64_t); 920 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 921 /* "if the ports are non-zero, then the sadb_address_proto field, 922 normally zero, MUST be filled in with the transport 923 protocol's number." - RFC2367 */ 924 addr->sadb_address_proto = 0; 925 addr->sadb_address_reserved = 0; 926 927 addr->sadb_address_prefixlen = 928 pfkey_sockaddr_fill(&x->props.saddr, 0, 929 (struct sockaddr *) (addr + 1), 930 x->props.family); 931 BUG_ON(!addr->sadb_address_prefixlen); 932 933 /* dst address */ 934 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 935 addr->sadb_address_len = 936 (sizeof(struct sadb_address)+sockaddr_size)/ 937 sizeof(uint64_t); 938 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 939 addr->sadb_address_proto = 0; 940 addr->sadb_address_reserved = 0; 941 942 addr->sadb_address_prefixlen = 943 pfkey_sockaddr_fill(&x->id.daddr, 0, 944 (struct sockaddr *) (addr + 1), 945 x->props.family); 946 BUG_ON(!addr->sadb_address_prefixlen); 947 948 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 949 x->props.family)) { 950 addr = skb_put(skb, 951 sizeof(struct sadb_address) + sockaddr_size); 952 addr->sadb_address_len = 953 (sizeof(struct sadb_address)+sockaddr_size)/ 954 sizeof(uint64_t); 955 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 956 addr->sadb_address_proto = 957 pfkey_proto_from_xfrm(x->sel.proto); 958 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 959 addr->sadb_address_reserved = 0; 960 961 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 962 (struct sockaddr *) (addr + 1), 963 x->props.family); 964 } 965 966 /* auth key */ 967 if (add_keys && auth_key_size) { 968 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 969 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 970 sizeof(uint64_t); 971 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 972 key->sadb_key_bits = x->aalg->alg_key_len; 973 key->sadb_key_reserved = 0; 974 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 975 } 976 /* encrypt key */ 977 if (add_keys && encrypt_key_size) { 978 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 979 key->sadb_key_len = (sizeof(struct sadb_key) + 980 encrypt_key_size) / sizeof(uint64_t); 981 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 982 key->sadb_key_bits = x->ealg->alg_key_len; 983 key->sadb_key_reserved = 0; 984 memcpy(key + 1, x->ealg->alg_key, 985 (x->ealg->alg_key_len+7)/8); 986 } 987 988 /* sa */ 989 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 990 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 991 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 992 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 993 kfree_skb(skb); 994 return ERR_PTR(-EINVAL); 995 } 996 sa2->sadb_x_sa2_mode = mode; 997 sa2->sadb_x_sa2_reserved1 = 0; 998 sa2->sadb_x_sa2_reserved2 = 0; 999 sa2->sadb_x_sa2_sequence = 0; 1000 sa2->sadb_x_sa2_reqid = x->props.reqid; 1001 1002 if (natt && natt->encap_type) { 1003 struct sadb_x_nat_t_type *n_type; 1004 struct sadb_x_nat_t_port *n_port; 1005 1006 /* type */ 1007 n_type = skb_put(skb, sizeof(*n_type)); 1008 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1009 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1010 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1011 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1012 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1013 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1014 1015 /* source port */ 1016 n_port = skb_put(skb, sizeof(*n_port)); 1017 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1018 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1019 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1020 n_port->sadb_x_nat_t_port_reserved = 0; 1021 1022 /* dest port */ 1023 n_port = skb_put(skb, sizeof(*n_port)); 1024 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1025 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1026 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1027 n_port->sadb_x_nat_t_port_reserved = 0; 1028 } 1029 1030 /* security context */ 1031 if (xfrm_ctx) { 1032 sec_ctx = skb_put(skb, 1033 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1034 sec_ctx->sadb_x_sec_len = 1035 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1036 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1037 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1038 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1039 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1040 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1041 xfrm_ctx->ctx_len); 1042 } 1043 1044 return skb; 1045} 1046 1047 1048static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1049{ 1050 struct sk_buff *skb; 1051 1052 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1053 1054 return skb; 1055} 1056 1057static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1058 int hsc) 1059{ 1060 return __pfkey_xfrm_state2msg(x, 0, hsc); 1061} 1062 1063static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1064 const struct sadb_msg *hdr, 1065 void * const *ext_hdrs) 1066{ 1067 struct xfrm_state *x; 1068 const struct sadb_lifetime *lifetime; 1069 const struct sadb_sa *sa; 1070 const struct sadb_key *key; 1071 const struct sadb_x_sec_ctx *sec_ctx; 1072 uint16_t proto; 1073 int err; 1074 1075 1076 sa = ext_hdrs[SADB_EXT_SA - 1]; 1077 if (!sa || 1078 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1079 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1080 return ERR_PTR(-EINVAL); 1081 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1082 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1083 return ERR_PTR(-EINVAL); 1084 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1085 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1086 return ERR_PTR(-EINVAL); 1087 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1088 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1089 return ERR_PTR(-EINVAL); 1090 1091 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1092 if (proto == 0) 1093 return ERR_PTR(-EINVAL); 1094 1095 /* default error is no buffer space */ 1096 err = -ENOBUFS; 1097 1098 /* RFC2367: 1099 1100 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1101 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1102 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1103 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1104 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1105 not true. 1106 1107 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1108 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1109 */ 1110 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1111 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1112 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1113 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1114 return ERR_PTR(-EINVAL); 1115 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1116 if (key != NULL && 1117 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1118 key->sadb_key_bits == 0) 1119 return ERR_PTR(-EINVAL); 1120 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1121 if (key != NULL && 1122 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1123 key->sadb_key_bits == 0) 1124 return ERR_PTR(-EINVAL); 1125 1126 x = xfrm_state_alloc(net); 1127 if (x == NULL) 1128 return ERR_PTR(-ENOBUFS); 1129 1130 x->id.proto = proto; 1131 x->id.spi = sa->sadb_sa_spi; 1132 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1133 (sizeof(x->replay.bitmap) * 8)); 1134 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1135 x->props.flags |= XFRM_STATE_NOECN; 1136 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1137 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1138 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1139 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1140 1141 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1142 if (lifetime != NULL) { 1143 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1144 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1145 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1146 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1147 } 1148 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1149 if (lifetime != NULL) { 1150 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1151 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1152 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1153 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1154 } 1155 1156 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1157 if (sec_ctx != NULL) { 1158 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1159 1160 if (!uctx) 1161 goto out; 1162 1163 err = security_xfrm_state_alloc(x, uctx); 1164 kfree(uctx); 1165 1166 if (err) 1167 goto out; 1168 } 1169 1170 err = -ENOBUFS; 1171 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1172 if (sa->sadb_sa_auth) { 1173 int keysize = 0; 1174 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1175 if (!a || !a->pfkey_supported) { 1176 err = -ENOSYS; 1177 goto out; 1178 } 1179 if (key) 1180 keysize = (key->sadb_key_bits + 7) / 8; 1181 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1182 if (!x->aalg) { 1183 err = -ENOMEM; 1184 goto out; 1185 } 1186 strcpy(x->aalg->alg_name, a->name); 1187 x->aalg->alg_key_len = 0; 1188 if (key) { 1189 x->aalg->alg_key_len = key->sadb_key_bits; 1190 memcpy(x->aalg->alg_key, key+1, keysize); 1191 } 1192 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1193 x->props.aalgo = sa->sadb_sa_auth; 1194 /* x->algo.flags = sa->sadb_sa_flags; */ 1195 } 1196 if (sa->sadb_sa_encrypt) { 1197 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1198 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1199 if (!a || !a->pfkey_supported) { 1200 err = -ENOSYS; 1201 goto out; 1202 } 1203 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1204 if (!x->calg) { 1205 err = -ENOMEM; 1206 goto out; 1207 } 1208 strcpy(x->calg->alg_name, a->name); 1209 x->props.calgo = sa->sadb_sa_encrypt; 1210 } else { 1211 int keysize = 0; 1212 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1213 if (!a || !a->pfkey_supported) { 1214 err = -ENOSYS; 1215 goto out; 1216 } 1217 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1218 if (key) 1219 keysize = (key->sadb_key_bits + 7) / 8; 1220 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1221 if (!x->ealg) { 1222 err = -ENOMEM; 1223 goto out; 1224 } 1225 strcpy(x->ealg->alg_name, a->name); 1226 x->ealg->alg_key_len = 0; 1227 if (key) { 1228 x->ealg->alg_key_len = key->sadb_key_bits; 1229 memcpy(x->ealg->alg_key, key+1, keysize); 1230 } 1231 x->props.ealgo = sa->sadb_sa_encrypt; 1232 x->geniv = a->uinfo.encr.geniv; 1233 } 1234 } 1235 /* x->algo.flags = sa->sadb_sa_flags; */ 1236 1237 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1238 &x->props.saddr); 1239 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1240 &x->id.daddr); 1241 1242 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1243 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1244 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1245 if (mode < 0) { 1246 err = -EINVAL; 1247 goto out; 1248 } 1249 x->props.mode = mode; 1250 x->props.reqid = sa2->sadb_x_sa2_reqid; 1251 } 1252 1253 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1254 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1255 1256 /* Nobody uses this, but we try. */ 1257 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1258 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1259 } 1260 1261 if (!x->sel.family) 1262 x->sel.family = x->props.family; 1263 1264 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1265 const struct sadb_x_nat_t_type* n_type; 1266 struct xfrm_encap_tmpl *natt; 1267 1268 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1269 if (!x->encap) { 1270 err = -ENOMEM; 1271 goto out; 1272 } 1273 1274 natt = x->encap; 1275 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1276 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1277 1278 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1279 const struct sadb_x_nat_t_port *n_port = 1280 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1281 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1282 } 1283 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1284 const struct sadb_x_nat_t_port *n_port = 1285 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1286 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1287 } 1288 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1289 } 1290 1291 err = xfrm_init_state(x); 1292 if (err) 1293 goto out; 1294 1295 x->km.seq = hdr->sadb_msg_seq; 1296 return x; 1297 1298out: 1299 x->km.state = XFRM_STATE_DEAD; 1300 xfrm_state_put(x); 1301 return ERR_PTR(err); 1302} 1303 1304static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1305{ 1306 return -EOPNOTSUPP; 1307} 1308 1309static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1310{ 1311 struct net *net = sock_net(sk); 1312 struct sk_buff *resp_skb; 1313 struct sadb_x_sa2 *sa2; 1314 struct sadb_address *saddr, *daddr; 1315 struct sadb_msg *out_hdr; 1316 struct sadb_spirange *range; 1317 struct xfrm_state *x = NULL; 1318 int mode; 1319 int err; 1320 u32 min_spi, max_spi; 1321 u32 reqid; 1322 u8 proto; 1323 unsigned short family; 1324 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1325 1326 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1327 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1328 return -EINVAL; 1329 1330 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1331 if (proto == 0) 1332 return -EINVAL; 1333 1334 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1335 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1336 if (mode < 0) 1337 return -EINVAL; 1338 reqid = sa2->sadb_x_sa2_reqid; 1339 } else { 1340 mode = 0; 1341 reqid = 0; 1342 } 1343 1344 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1345 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1346 1347 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1348 switch (family) { 1349 case AF_INET: 1350 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1351 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1352 break; 1353#if IS_ENABLED(CONFIG_IPV6) 1354 case AF_INET6: 1355 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1356 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1357 break; 1358#endif 1359 } 1360 1361 if (hdr->sadb_msg_seq) { 1362 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1363 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1364 xfrm_state_put(x); 1365 x = NULL; 1366 } 1367 } 1368 1369 if (!x) 1370 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, proto, xdaddr, xsaddr, 1, family); 1371 1372 if (x == NULL) 1373 return -ENOENT; 1374 1375 min_spi = 0x100; 1376 max_spi = 0x0fffffff; 1377 1378 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1379 if (range) { 1380 min_spi = range->sadb_spirange_min; 1381 max_spi = range->sadb_spirange_max; 1382 } 1383 1384 err = verify_spi_info(x->id.proto, min_spi, max_spi); 1385 if (err) { 1386 xfrm_state_put(x); 1387 return err; 1388 } 1389 1390 err = xfrm_alloc_spi(x, min_spi, max_spi); 1391 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1392 1393 if (IS_ERR(resp_skb)) { 1394 xfrm_state_put(x); 1395 return PTR_ERR(resp_skb); 1396 } 1397 1398 out_hdr = (struct sadb_msg *) resp_skb->data; 1399 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1400 out_hdr->sadb_msg_type = SADB_GETSPI; 1401 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1402 out_hdr->sadb_msg_errno = 0; 1403 out_hdr->sadb_msg_reserved = 0; 1404 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1405 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1406 1407 xfrm_state_put(x); 1408 1409 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1410 1411 return 0; 1412} 1413 1414static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1415{ 1416 struct net *net = sock_net(sk); 1417 struct xfrm_state *x; 1418 1419 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1420 return -EOPNOTSUPP; 1421 1422 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1423 return 0; 1424 1425 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1426 if (x == NULL) 1427 return 0; 1428 1429 spin_lock_bh(&x->lock); 1430 if (x->km.state == XFRM_STATE_ACQ) 1431 x->km.state = XFRM_STATE_ERROR; 1432 1433 spin_unlock_bh(&x->lock); 1434 xfrm_state_put(x); 1435 return 0; 1436} 1437 1438static inline int event2poltype(int event) 1439{ 1440 switch (event) { 1441 case XFRM_MSG_DELPOLICY: 1442 return SADB_X_SPDDELETE; 1443 case XFRM_MSG_NEWPOLICY: 1444 return SADB_X_SPDADD; 1445 case XFRM_MSG_UPDPOLICY: 1446 return SADB_X_SPDUPDATE; 1447 case XFRM_MSG_POLEXPIRE: 1448 // return SADB_X_SPDEXPIRE; 1449 default: 1450 pr_err("pfkey: Unknown policy event %d\n", event); 1451 break; 1452 } 1453 1454 return 0; 1455} 1456 1457static inline int event2keytype(int event) 1458{ 1459 switch (event) { 1460 case XFRM_MSG_DELSA: 1461 return SADB_DELETE; 1462 case XFRM_MSG_NEWSA: 1463 return SADB_ADD; 1464 case XFRM_MSG_UPDSA: 1465 return SADB_UPDATE; 1466 case XFRM_MSG_EXPIRE: 1467 return SADB_EXPIRE; 1468 default: 1469 pr_err("pfkey: Unknown SA event %d\n", event); 1470 break; 1471 } 1472 1473 return 0; 1474} 1475 1476/* ADD/UPD/DEL */ 1477static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1478{ 1479 struct sk_buff *skb; 1480 struct sadb_msg *hdr; 1481 1482 skb = pfkey_xfrm_state2msg(x); 1483 1484 if (IS_ERR(skb)) 1485 return PTR_ERR(skb); 1486 1487 hdr = (struct sadb_msg *) skb->data; 1488 hdr->sadb_msg_version = PF_KEY_V2; 1489 hdr->sadb_msg_type = event2keytype(c->event); 1490 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1491 hdr->sadb_msg_errno = 0; 1492 hdr->sadb_msg_reserved = 0; 1493 hdr->sadb_msg_seq = c->seq; 1494 hdr->sadb_msg_pid = c->portid; 1495 1496 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1497 1498 return 0; 1499} 1500 1501static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1502{ 1503 struct net *net = sock_net(sk); 1504 struct xfrm_state *x; 1505 int err; 1506 struct km_event c; 1507 1508 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1509 if (IS_ERR(x)) 1510 return PTR_ERR(x); 1511 1512 xfrm_state_hold(x); 1513 if (hdr->sadb_msg_type == SADB_ADD) 1514 err = xfrm_state_add(x); 1515 else 1516 err = xfrm_state_update(x); 1517 1518 xfrm_audit_state_add(x, err ? 0 : 1, true); 1519 1520 if (err < 0) { 1521 x->km.state = XFRM_STATE_DEAD; 1522 __xfrm_state_put(x); 1523 goto out; 1524 } 1525 1526 if (hdr->sadb_msg_type == SADB_ADD) 1527 c.event = XFRM_MSG_NEWSA; 1528 else 1529 c.event = XFRM_MSG_UPDSA; 1530 c.seq = hdr->sadb_msg_seq; 1531 c.portid = hdr->sadb_msg_pid; 1532 km_state_notify(x, &c); 1533out: 1534 xfrm_state_put(x); 1535 return err; 1536} 1537 1538static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1539{ 1540 struct net *net = sock_net(sk); 1541 struct xfrm_state *x; 1542 struct km_event c; 1543 int err; 1544 1545 if (!ext_hdrs[SADB_EXT_SA-1] || 1546 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1547 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1548 return -EINVAL; 1549 1550 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1551 if (x == NULL) 1552 return -ESRCH; 1553 1554 if ((err = security_xfrm_state_delete(x))) 1555 goto out; 1556 1557 if (xfrm_state_kern(x)) { 1558 err = -EPERM; 1559 goto out; 1560 } 1561 1562 err = xfrm_state_delete(x); 1563 1564 if (err < 0) 1565 goto out; 1566 1567 c.seq = hdr->sadb_msg_seq; 1568 c.portid = hdr->sadb_msg_pid; 1569 c.event = XFRM_MSG_DELSA; 1570 km_state_notify(x, &c); 1571out: 1572 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1573 xfrm_state_put(x); 1574 1575 return err; 1576} 1577 1578static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1579{ 1580 struct net *net = sock_net(sk); 1581 __u8 proto; 1582 struct sk_buff *out_skb; 1583 struct sadb_msg *out_hdr; 1584 struct xfrm_state *x; 1585 1586 if (!ext_hdrs[SADB_EXT_SA-1] || 1587 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1588 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1589 return -EINVAL; 1590 1591 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1592 if (x == NULL) 1593 return -ESRCH; 1594 1595 out_skb = pfkey_xfrm_state2msg(x); 1596 proto = x->id.proto; 1597 xfrm_state_put(x); 1598 if (IS_ERR(out_skb)) 1599 return PTR_ERR(out_skb); 1600 1601 out_hdr = (struct sadb_msg *) out_skb->data; 1602 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1603 out_hdr->sadb_msg_type = SADB_GET; 1604 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1605 out_hdr->sadb_msg_errno = 0; 1606 out_hdr->sadb_msg_reserved = 0; 1607 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1608 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1609 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1610 1611 return 0; 1612} 1613 1614static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1615 gfp_t allocation) 1616{ 1617 struct sk_buff *skb; 1618 struct sadb_msg *hdr; 1619 int len, auth_len, enc_len, i; 1620 1621 auth_len = xfrm_count_pfkey_auth_supported(); 1622 if (auth_len) { 1623 auth_len *= sizeof(struct sadb_alg); 1624 auth_len += sizeof(struct sadb_supported); 1625 } 1626 1627 enc_len = xfrm_count_pfkey_enc_supported(); 1628 if (enc_len) { 1629 enc_len *= sizeof(struct sadb_alg); 1630 enc_len += sizeof(struct sadb_supported); 1631 } 1632 1633 len = enc_len + auth_len + sizeof(struct sadb_msg); 1634 1635 skb = alloc_skb(len + 16, allocation); 1636 if (!skb) 1637 goto out_put_algs; 1638 1639 hdr = skb_put(skb, sizeof(*hdr)); 1640 pfkey_hdr_dup(hdr, orig); 1641 hdr->sadb_msg_errno = 0; 1642 hdr->sadb_msg_len = len / sizeof(uint64_t); 1643 1644 if (auth_len) { 1645 struct sadb_supported *sp; 1646 struct sadb_alg *ap; 1647 1648 sp = skb_put(skb, auth_len); 1649 ap = (struct sadb_alg *) (sp + 1); 1650 1651 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1652 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1653 1654 for (i = 0; ; i++) { 1655 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1656 if (!aalg) 1657 break; 1658 if (!aalg->pfkey_supported) 1659 continue; 1660 if (aalg->available) 1661 *ap++ = aalg->desc; 1662 } 1663 } 1664 1665 if (enc_len) { 1666 struct sadb_supported *sp; 1667 struct sadb_alg *ap; 1668 1669 sp = skb_put(skb, enc_len); 1670 ap = (struct sadb_alg *) (sp + 1); 1671 1672 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1673 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1674 1675 for (i = 0; ; i++) { 1676 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1677 if (!ealg) 1678 break; 1679 if (!ealg->pfkey_supported) 1680 continue; 1681 if (ealg->available) 1682 *ap++ = ealg->desc; 1683 } 1684 } 1685 1686out_put_algs: 1687 return skb; 1688} 1689 1690static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1691{ 1692 struct pfkey_sock *pfk = pfkey_sk(sk); 1693 struct sk_buff *supp_skb; 1694 1695 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1696 return -EINVAL; 1697 1698 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1699 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1700 return -EEXIST; 1701 pfk->registered |= (1<<hdr->sadb_msg_satype); 1702 } 1703 1704 mutex_lock(&pfkey_mutex); 1705 xfrm_probe_algs(); 1706 1707 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); 1708 mutex_unlock(&pfkey_mutex); 1709 1710 if (!supp_skb) { 1711 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1712 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1713 1714 return -ENOBUFS; 1715 } 1716 1717 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1718 sock_net(sk)); 1719 return 0; 1720} 1721 1722static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1723{ 1724 struct sk_buff *skb; 1725 struct sadb_msg *hdr; 1726 1727 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1728 if (!skb) 1729 return -ENOBUFS; 1730 1731 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1732 hdr->sadb_msg_errno = (uint8_t) 0; 1733 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1734 1735 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1736 sock_net(sk)); 1737} 1738 1739static int key_notify_sa_flush(const struct km_event *c) 1740{ 1741 struct sk_buff *skb; 1742 struct sadb_msg *hdr; 1743 1744 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1745 if (!skb) 1746 return -ENOBUFS; 1747 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1748 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1749 hdr->sadb_msg_type = SADB_FLUSH; 1750 hdr->sadb_msg_seq = c->seq; 1751 hdr->sadb_msg_pid = c->portid; 1752 hdr->sadb_msg_version = PF_KEY_V2; 1753 hdr->sadb_msg_errno = (uint8_t) 0; 1754 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1755 hdr->sadb_msg_reserved = 0; 1756 1757 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1758 1759 return 0; 1760} 1761 1762static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1763{ 1764 struct net *net = sock_net(sk); 1765 unsigned int proto; 1766 struct km_event c; 1767 int err, err2; 1768 1769 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1770 if (proto == 0) 1771 return -EINVAL; 1772 1773 err = xfrm_state_flush(net, proto, true, false); 1774 err2 = unicast_flush_resp(sk, hdr); 1775 if (err || err2) { 1776 if (err == -ESRCH) /* empty table - go quietly */ 1777 err = 0; 1778 return err ? err : err2; 1779 } 1780 1781 c.data.proto = proto; 1782 c.seq = hdr->sadb_msg_seq; 1783 c.portid = hdr->sadb_msg_pid; 1784 c.event = XFRM_MSG_FLUSHSA; 1785 c.net = net; 1786 km_state_notify(NULL, &c); 1787 1788 return 0; 1789} 1790 1791static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1792{ 1793 struct pfkey_sock *pfk = ptr; 1794 struct sk_buff *out_skb; 1795 struct sadb_msg *out_hdr; 1796 1797 if (!pfkey_can_dump(&pfk->sk)) 1798 return -ENOBUFS; 1799 1800 out_skb = pfkey_xfrm_state2msg(x); 1801 if (IS_ERR(out_skb)) 1802 return PTR_ERR(out_skb); 1803 1804 out_hdr = (struct sadb_msg *) out_skb->data; 1805 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1806 out_hdr->sadb_msg_type = SADB_DUMP; 1807 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1808 out_hdr->sadb_msg_errno = 0; 1809 out_hdr->sadb_msg_reserved = 0; 1810 out_hdr->sadb_msg_seq = count + 1; 1811 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1812 1813 if (pfk->dump.skb) 1814 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1815 &pfk->sk, sock_net(&pfk->sk)); 1816 pfk->dump.skb = out_skb; 1817 1818 return 0; 1819} 1820 1821static int pfkey_dump_sa(struct pfkey_sock *pfk) 1822{ 1823 struct net *net = sock_net(&pfk->sk); 1824 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1825} 1826 1827static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1828{ 1829 struct net *net = sock_net(&pfk->sk); 1830 1831 xfrm_state_walk_done(&pfk->dump.u.state, net); 1832} 1833 1834static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1835{ 1836 u8 proto; 1837 struct xfrm_address_filter *filter = NULL; 1838 struct pfkey_sock *pfk = pfkey_sk(sk); 1839 1840 mutex_lock(&pfk->dump_lock); 1841 if (pfk->dump.dump != NULL) { 1842 mutex_unlock(&pfk->dump_lock); 1843 return -EBUSY; 1844 } 1845 1846 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1847 if (proto == 0) { 1848 mutex_unlock(&pfk->dump_lock); 1849 return -EINVAL; 1850 } 1851 1852 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1853 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1854 1855 if ((xfilter->sadb_x_filter_splen > 1856 (sizeof(xfrm_address_t) << 3)) || 1857 (xfilter->sadb_x_filter_dplen > 1858 (sizeof(xfrm_address_t) << 3))) { 1859 mutex_unlock(&pfk->dump_lock); 1860 return -EINVAL; 1861 } 1862 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1863 if (filter == NULL) { 1864 mutex_unlock(&pfk->dump_lock); 1865 return -ENOMEM; 1866 } 1867 1868 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1869 sizeof(xfrm_address_t)); 1870 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1871 sizeof(xfrm_address_t)); 1872 filter->family = xfilter->sadb_x_filter_family; 1873 filter->splen = xfilter->sadb_x_filter_splen; 1874 filter->dplen = xfilter->sadb_x_filter_dplen; 1875 } 1876 1877 pfk->dump.msg_version = hdr->sadb_msg_version; 1878 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1879 pfk->dump.dump = pfkey_dump_sa; 1880 pfk->dump.done = pfkey_dump_sa_done; 1881 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1882 mutex_unlock(&pfk->dump_lock); 1883 1884 return pfkey_do_dump(pfk); 1885} 1886 1887static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1888{ 1889 struct pfkey_sock *pfk = pfkey_sk(sk); 1890 int satype = hdr->sadb_msg_satype; 1891 bool reset_errno = false; 1892 1893 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1894 reset_errno = true; 1895 if (satype != 0 && satype != 1) 1896 return -EINVAL; 1897 pfk->promisc = satype; 1898 } 1899 if (reset_errno && skb_cloned(skb)) 1900 skb = skb_copy(skb, GFP_KERNEL); 1901 else 1902 skb = skb_clone(skb, GFP_KERNEL); 1903 1904 if (reset_errno && skb) { 1905 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1906 new_hdr->sadb_msg_errno = 0; 1907 } 1908 1909 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1910 return 0; 1911} 1912 1913static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1914{ 1915 int i; 1916 u32 reqid = *(u32*)ptr; 1917 1918 for (i=0; i<xp->xfrm_nr; i++) { 1919 if (xp->xfrm_vec[i].reqid == reqid) 1920 return -EEXIST; 1921 } 1922 return 0; 1923} 1924 1925static u32 gen_reqid(struct net *net) 1926{ 1927 struct xfrm_policy_walk walk; 1928 u32 start; 1929 int rc; 1930 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1931 1932 start = reqid; 1933 do { 1934 ++reqid; 1935 if (reqid == 0) 1936 reqid = IPSEC_MANUAL_REQID_MAX+1; 1937 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1938 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1939 xfrm_policy_walk_done(&walk, net); 1940 if (rc != -EEXIST) 1941 return reqid; 1942 } while (reqid != start); 1943 return 0; 1944} 1945 1946static int 1947parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol, 1948 struct sadb_x_ipsecrequest *rq) 1949{ 1950 struct net *net = xp_net(xp); 1951 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1952 int mode; 1953 1954 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1955 return -ELOOP; 1956 1957 if (rq->sadb_x_ipsecrequest_mode == 0) 1958 return -EINVAL; 1959 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1960 return -EINVAL; 1961 1962 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1963 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1964 return -EINVAL; 1965 t->mode = mode; 1966 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) { 1967 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) && 1968 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND) 1969 return -EINVAL; 1970 t->optional = 1; 1971 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1972 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1973 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1974 t->reqid = 0; 1975 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1976 return -ENOBUFS; 1977 } 1978 1979 /* addresses present only in tunnel mode */ 1980 if (t->mode == XFRM_MODE_TUNNEL) { 1981 int err; 1982 1983 err = parse_sockaddr_pair( 1984 (struct sockaddr *)(rq + 1), 1985 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1986 &t->saddr, &t->id.daddr, &t->encap_family); 1987 if (err) 1988 return err; 1989 } else 1990 t->encap_family = xp->family; 1991 1992 /* No way to set this via kame pfkey */ 1993 t->allalgs = 1; 1994 xp->xfrm_nr++; 1995 return 0; 1996} 1997 1998static int 1999parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 2000{ 2001 int err; 2002 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 2003 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 2004 2005 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 2006 return -EINVAL; 2007 2008 while (len >= sizeof(*rq)) { 2009 if (len < rq->sadb_x_ipsecrequest_len || 2010 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2011 return -EINVAL; 2012 2013 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0) 2014 return err; 2015 len -= rq->sadb_x_ipsecrequest_len; 2016 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2017 } 2018 return 0; 2019} 2020 2021static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2022{ 2023 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2024 2025 if (xfrm_ctx) { 2026 int len = sizeof(struct sadb_x_sec_ctx); 2027 len += xfrm_ctx->ctx_len; 2028 return PFKEY_ALIGN8(len); 2029 } 2030 return 0; 2031} 2032 2033static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2034{ 2035 const struct xfrm_tmpl *t; 2036 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2037 int socklen = 0; 2038 int i; 2039 2040 for (i=0; i<xp->xfrm_nr; i++) { 2041 t = xp->xfrm_vec + i; 2042 socklen += pfkey_sockaddr_len(t->encap_family); 2043 } 2044 2045 return sizeof(struct sadb_msg) + 2046 (sizeof(struct sadb_lifetime) * 3) + 2047 (sizeof(struct sadb_address) * 2) + 2048 (sockaddr_size * 2) + 2049 sizeof(struct sadb_x_policy) + 2050 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2051 (socklen * 2) + 2052 pfkey_xfrm_policy2sec_ctx_size(xp); 2053} 2054 2055static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2056{ 2057 struct sk_buff *skb; 2058 int size; 2059 2060 size = pfkey_xfrm_policy2msg_size(xp); 2061 2062 skb = alloc_skb(size + 16, GFP_ATOMIC); 2063 if (skb == NULL) 2064 return ERR_PTR(-ENOBUFS); 2065 2066 return skb; 2067} 2068 2069static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2070{ 2071 struct sadb_msg *hdr; 2072 struct sadb_address *addr; 2073 struct sadb_lifetime *lifetime; 2074 struct sadb_x_policy *pol; 2075 struct sadb_x_sec_ctx *sec_ctx; 2076 struct xfrm_sec_ctx *xfrm_ctx; 2077 int i; 2078 int size; 2079 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2080 int socklen = pfkey_sockaddr_len(xp->family); 2081 2082 size = pfkey_xfrm_policy2msg_size(xp); 2083 2084 /* call should fill header later */ 2085 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2086 memset(hdr, 0, size); /* XXX do we need this ? */ 2087 2088 /* src address */ 2089 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2090 addr->sadb_address_len = 2091 (sizeof(struct sadb_address)+sockaddr_size)/ 2092 sizeof(uint64_t); 2093 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2094 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2095 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2096 addr->sadb_address_reserved = 0; 2097 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2098 xp->selector.sport, 2099 (struct sockaddr *) (addr + 1), 2100 xp->family)) 2101 BUG(); 2102 2103 /* dst address */ 2104 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2105 addr->sadb_address_len = 2106 (sizeof(struct sadb_address)+sockaddr_size)/ 2107 sizeof(uint64_t); 2108 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2109 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2110 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2111 addr->sadb_address_reserved = 0; 2112 2113 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2114 (struct sockaddr *) (addr + 1), 2115 xp->family); 2116 2117 /* hard time */ 2118 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2119 lifetime->sadb_lifetime_len = 2120 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2121 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2122 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2123 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2124 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2125 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2126 /* soft time */ 2127 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2128 lifetime->sadb_lifetime_len = 2129 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2130 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2131 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2132 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2133 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2134 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2135 /* current time */ 2136 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2137 lifetime->sadb_lifetime_len = 2138 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2139 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2140 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2141 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2142 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2143 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2144 2145 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2146 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2147 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2148 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2149 if (xp->action == XFRM_POLICY_ALLOW) { 2150 if (xp->xfrm_nr) 2151 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2152 else 2153 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2154 } 2155 pol->sadb_x_policy_dir = dir+1; 2156 pol->sadb_x_policy_reserved = 0; 2157 pol->sadb_x_policy_id = xp->index; 2158 pol->sadb_x_policy_priority = xp->priority; 2159 2160 for (i=0; i<xp->xfrm_nr; i++) { 2161 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2162 struct sadb_x_ipsecrequest *rq; 2163 int req_size; 2164 int mode; 2165 2166 req_size = sizeof(struct sadb_x_ipsecrequest); 2167 if (t->mode == XFRM_MODE_TUNNEL) { 2168 socklen = pfkey_sockaddr_len(t->encap_family); 2169 req_size += socklen * 2; 2170 } else { 2171 size -= 2*socklen; 2172 } 2173 rq = skb_put(skb, req_size); 2174 pol->sadb_x_policy_len += req_size/8; 2175 memset(rq, 0, sizeof(*rq)); 2176 rq->sadb_x_ipsecrequest_len = req_size; 2177 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2178 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2179 return -EINVAL; 2180 rq->sadb_x_ipsecrequest_mode = mode; 2181 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2182 if (t->reqid) 2183 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2184 if (t->optional) 2185 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2186 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2187 2188 if (t->mode == XFRM_MODE_TUNNEL) { 2189 u8 *sa = (void *)(rq + 1); 2190 pfkey_sockaddr_fill(&t->saddr, 0, 2191 (struct sockaddr *)sa, 2192 t->encap_family); 2193 pfkey_sockaddr_fill(&t->id.daddr, 0, 2194 (struct sockaddr *) (sa + socklen), 2195 t->encap_family); 2196 } 2197 } 2198 2199 /* security context */ 2200 if ((xfrm_ctx = xp->security)) { 2201 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2202 2203 sec_ctx = skb_put(skb, ctx_size); 2204 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2205 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2206 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2207 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2208 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2209 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2210 xfrm_ctx->ctx_len); 2211 } 2212 2213 hdr->sadb_msg_len = size / sizeof(uint64_t); 2214 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2215 2216 return 0; 2217} 2218 2219static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2220{ 2221 struct sk_buff *out_skb; 2222 struct sadb_msg *out_hdr; 2223 int err; 2224 2225 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2226 if (IS_ERR(out_skb)) 2227 return PTR_ERR(out_skb); 2228 2229 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2230 if (err < 0) { 2231 kfree_skb(out_skb); 2232 return err; 2233 } 2234 2235 out_hdr = (struct sadb_msg *) out_skb->data; 2236 out_hdr->sadb_msg_version = PF_KEY_V2; 2237 2238 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2239 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2240 else 2241 out_hdr->sadb_msg_type = event2poltype(c->event); 2242 out_hdr->sadb_msg_errno = 0; 2243 out_hdr->sadb_msg_seq = c->seq; 2244 out_hdr->sadb_msg_pid = c->portid; 2245 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2246 return 0; 2247 2248} 2249 2250static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2251{ 2252 struct net *net = sock_net(sk); 2253 int err = 0; 2254 struct sadb_lifetime *lifetime; 2255 struct sadb_address *sa; 2256 struct sadb_x_policy *pol; 2257 struct xfrm_policy *xp; 2258 struct km_event c; 2259 struct sadb_x_sec_ctx *sec_ctx; 2260 2261 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2262 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2263 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2264 return -EINVAL; 2265 2266 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2267 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2268 return -EINVAL; 2269 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2270 return -EINVAL; 2271 2272 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2273 if (xp == NULL) 2274 return -ENOBUFS; 2275 2276 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2277 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2278 xp->priority = pol->sadb_x_policy_priority; 2279 2280 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2281 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2282 xp->selector.family = xp->family; 2283 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2284 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2285 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2286 if (xp->selector.sport) 2287 xp->selector.sport_mask = htons(0xffff); 2288 2289 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2290 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2291 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2292 2293 /* Amusing, we set this twice. KAME apps appear to set same value 2294 * in both addresses. 2295 */ 2296 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2297 2298 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2299 if (xp->selector.dport) 2300 xp->selector.dport_mask = htons(0xffff); 2301 2302 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2303 if (sec_ctx != NULL) { 2304 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2305 2306 if (!uctx) { 2307 err = -ENOBUFS; 2308 goto out; 2309 } 2310 2311 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2312 kfree(uctx); 2313 2314 if (err) 2315 goto out; 2316 } 2317 2318 xp->lft.soft_byte_limit = XFRM_INF; 2319 xp->lft.hard_byte_limit = XFRM_INF; 2320 xp->lft.soft_packet_limit = XFRM_INF; 2321 xp->lft.hard_packet_limit = XFRM_INF; 2322 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2323 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2324 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2325 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2326 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2327 } 2328 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2329 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2330 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2331 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2332 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2333 } 2334 xp->xfrm_nr = 0; 2335 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2336 (err = parse_ipsecrequests(xp, pol)) < 0) 2337 goto out; 2338 2339 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2340 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2341 2342 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2343 2344 if (err) 2345 goto out; 2346 2347 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2348 c.event = XFRM_MSG_UPDPOLICY; 2349 else 2350 c.event = XFRM_MSG_NEWPOLICY; 2351 2352 c.seq = hdr->sadb_msg_seq; 2353 c.portid = hdr->sadb_msg_pid; 2354 2355 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2356 xfrm_pol_put(xp); 2357 return 0; 2358 2359out: 2360 xp->walk.dead = 1; 2361 xfrm_policy_destroy(xp); 2362 return err; 2363} 2364 2365static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2366{ 2367 struct net *net = sock_net(sk); 2368 int err; 2369 struct sadb_address *sa; 2370 struct sadb_x_policy *pol; 2371 struct xfrm_policy *xp; 2372 struct xfrm_selector sel; 2373 struct km_event c; 2374 struct sadb_x_sec_ctx *sec_ctx; 2375 struct xfrm_sec_ctx *pol_ctx = NULL; 2376 2377 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2378 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2379 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2380 return -EINVAL; 2381 2382 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2383 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2384 return -EINVAL; 2385 2386 memset(&sel, 0, sizeof(sel)); 2387 2388 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2389 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2390 sel.prefixlen_s = sa->sadb_address_prefixlen; 2391 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2392 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2393 if (sel.sport) 2394 sel.sport_mask = htons(0xffff); 2395 2396 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2397 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2398 sel.prefixlen_d = sa->sadb_address_prefixlen; 2399 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2400 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2401 if (sel.dport) 2402 sel.dport_mask = htons(0xffff); 2403 2404 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2405 if (sec_ctx != NULL) { 2406 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2407 2408 if (!uctx) 2409 return -ENOMEM; 2410 2411 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2412 kfree(uctx); 2413 if (err) 2414 return err; 2415 } 2416 2417 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2418 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2419 1, &err); 2420 security_xfrm_policy_free(pol_ctx); 2421 if (xp == NULL) 2422 return -ENOENT; 2423 2424 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2425 2426 if (err) 2427 goto out; 2428 2429 c.seq = hdr->sadb_msg_seq; 2430 c.portid = hdr->sadb_msg_pid; 2431 c.data.byid = 0; 2432 c.event = XFRM_MSG_DELPOLICY; 2433 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2434 2435out: 2436 xfrm_pol_put(xp); 2437 return err; 2438} 2439 2440static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2441{ 2442 int err; 2443 struct sk_buff *out_skb; 2444 struct sadb_msg *out_hdr; 2445 err = 0; 2446 2447 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2448 if (IS_ERR(out_skb)) { 2449 err = PTR_ERR(out_skb); 2450 goto out; 2451 } 2452 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2453 if (err < 0) { 2454 kfree_skb(out_skb); 2455 goto out; 2456 } 2457 2458 out_hdr = (struct sadb_msg *) out_skb->data; 2459 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2460 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2461 out_hdr->sadb_msg_satype = 0; 2462 out_hdr->sadb_msg_errno = 0; 2463 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2464 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2465 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2466 err = 0; 2467 2468out: 2469 return err; 2470} 2471 2472static int pfkey_sockaddr_pair_size(sa_family_t family) 2473{ 2474 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2475} 2476 2477static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2478 xfrm_address_t *saddr, xfrm_address_t *daddr, 2479 u16 *family) 2480{ 2481 int af, socklen; 2482 2483 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2484 return -EINVAL; 2485 2486 af = pfkey_sockaddr_extract(sa, saddr); 2487 if (!af) 2488 return -EINVAL; 2489 2490 socklen = pfkey_sockaddr_len(af); 2491 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2492 daddr) != af) 2493 return -EINVAL; 2494 2495 *family = af; 2496 return 0; 2497} 2498 2499#ifdef CONFIG_NET_KEY_MIGRATE 2500static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2501 struct xfrm_migrate *m) 2502{ 2503 int err; 2504 struct sadb_x_ipsecrequest *rq2; 2505 int mode; 2506 2507 if (len < sizeof(*rq1) || 2508 len < rq1->sadb_x_ipsecrequest_len || 2509 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2510 return -EINVAL; 2511 2512 /* old endoints */ 2513 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2514 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2515 &m->old_saddr, &m->old_daddr, 2516 &m->old_family); 2517 if (err) 2518 return err; 2519 2520 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2521 len -= rq1->sadb_x_ipsecrequest_len; 2522 2523 if (len <= sizeof(*rq2) || 2524 len < rq2->sadb_x_ipsecrequest_len || 2525 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2526 return -EINVAL; 2527 2528 /* new endpoints */ 2529 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2530 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2531 &m->new_saddr, &m->new_daddr, 2532 &m->new_family); 2533 if (err) 2534 return err; 2535 2536 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2537 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2538 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2539 return -EINVAL; 2540 2541 m->proto = rq1->sadb_x_ipsecrequest_proto; 2542 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2543 return -EINVAL; 2544 m->mode = mode; 2545 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2546 2547 return ((int)(rq1->sadb_x_ipsecrequest_len + 2548 rq2->sadb_x_ipsecrequest_len)); 2549} 2550 2551static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2552 const struct sadb_msg *hdr, void * const *ext_hdrs) 2553{ 2554 int i, len, ret, err = -EINVAL; 2555 u8 dir; 2556 struct sadb_address *sa; 2557 struct sadb_x_kmaddress *kma; 2558 struct sadb_x_policy *pol; 2559 struct sadb_x_ipsecrequest *rq; 2560 struct xfrm_selector sel; 2561 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2562 struct xfrm_kmaddress k; 2563 struct net *net = sock_net(sk); 2564 2565 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2566 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2567 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2568 err = -EINVAL; 2569 goto out; 2570 } 2571 2572 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2573 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2574 2575 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2576 err = -EINVAL; 2577 goto out; 2578 } 2579 2580 if (kma) { 2581 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2582 k.reserved = kma->sadb_x_kmaddress_reserved; 2583 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2584 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2585 &k.local, &k.remote, &k.family); 2586 if (ret < 0) { 2587 err = ret; 2588 goto out; 2589 } 2590 } 2591 2592 dir = pol->sadb_x_policy_dir - 1; 2593 memset(&sel, 0, sizeof(sel)); 2594 2595 /* set source address info of selector */ 2596 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2597 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2598 sel.prefixlen_s = sa->sadb_address_prefixlen; 2599 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2600 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2601 if (sel.sport) 2602 sel.sport_mask = htons(0xffff); 2603 2604 /* set destination address info of selector */ 2605 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2606 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2607 sel.prefixlen_d = sa->sadb_address_prefixlen; 2608 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2609 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2610 if (sel.dport) 2611 sel.dport_mask = htons(0xffff); 2612 2613 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2614 2615 /* extract ipsecrequests */ 2616 i = 0; 2617 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2618 2619 while (len > 0 && i < XFRM_MAX_DEPTH) { 2620 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2621 if (ret < 0) { 2622 err = ret; 2623 goto out; 2624 } else { 2625 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2626 len -= ret; 2627 i++; 2628 } 2629 } 2630 2631 if (!i || len > 0) { 2632 err = -EINVAL; 2633 goto out; 2634 } 2635 2636 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2637 kma ? &k : NULL, net, NULL, 0); 2638 2639 out: 2640 return err; 2641} 2642#else 2643static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2644 const struct sadb_msg *hdr, void * const *ext_hdrs) 2645{ 2646 return -ENOPROTOOPT; 2647} 2648#endif 2649 2650 2651static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2652{ 2653 struct net *net = sock_net(sk); 2654 unsigned int dir; 2655 int err = 0, delete; 2656 struct sadb_x_policy *pol; 2657 struct xfrm_policy *xp; 2658 struct km_event c; 2659 2660 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2661 return -EINVAL; 2662 2663 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2664 if (dir >= XFRM_POLICY_MAX) 2665 return -EINVAL; 2666 2667 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2668 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2669 dir, pol->sadb_x_policy_id, delete, &err); 2670 if (xp == NULL) 2671 return -ENOENT; 2672 2673 if (delete) { 2674 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2675 2676 if (err) 2677 goto out; 2678 c.seq = hdr->sadb_msg_seq; 2679 c.portid = hdr->sadb_msg_pid; 2680 c.data.byid = 1; 2681 c.event = XFRM_MSG_DELPOLICY; 2682 km_policy_notify(xp, dir, &c); 2683 } else { 2684 err = key_pol_get_resp(sk, xp, hdr, dir); 2685 } 2686 2687out: 2688 xfrm_pol_put(xp); 2689 return err; 2690} 2691 2692static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2693{ 2694 struct pfkey_sock *pfk = ptr; 2695 struct sk_buff *out_skb; 2696 struct sadb_msg *out_hdr; 2697 int err; 2698 2699 if (!pfkey_can_dump(&pfk->sk)) 2700 return -ENOBUFS; 2701 2702 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2703 if (IS_ERR(out_skb)) 2704 return PTR_ERR(out_skb); 2705 2706 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2707 if (err < 0) { 2708 kfree_skb(out_skb); 2709 return err; 2710 } 2711 2712 out_hdr = (struct sadb_msg *) out_skb->data; 2713 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2714 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2715 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2716 out_hdr->sadb_msg_errno = 0; 2717 out_hdr->sadb_msg_seq = count + 1; 2718 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2719 2720 if (pfk->dump.skb) 2721 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2722 &pfk->sk, sock_net(&pfk->sk)); 2723 pfk->dump.skb = out_skb; 2724 2725 return 0; 2726} 2727 2728static int pfkey_dump_sp(struct pfkey_sock *pfk) 2729{ 2730 struct net *net = sock_net(&pfk->sk); 2731 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2732} 2733 2734static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2735{ 2736 struct net *net = sock_net((struct sock *)pfk); 2737 2738 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2739} 2740 2741static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2742{ 2743 struct pfkey_sock *pfk = pfkey_sk(sk); 2744 2745 mutex_lock(&pfk->dump_lock); 2746 if (pfk->dump.dump != NULL) { 2747 mutex_unlock(&pfk->dump_lock); 2748 return -EBUSY; 2749 } 2750 2751 pfk->dump.msg_version = hdr->sadb_msg_version; 2752 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2753 pfk->dump.dump = pfkey_dump_sp; 2754 pfk->dump.done = pfkey_dump_sp_done; 2755 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2756 mutex_unlock(&pfk->dump_lock); 2757 2758 return pfkey_do_dump(pfk); 2759} 2760 2761static int key_notify_policy_flush(const struct km_event *c) 2762{ 2763 struct sk_buff *skb_out; 2764 struct sadb_msg *hdr; 2765 2766 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2767 if (!skb_out) 2768 return -ENOBUFS; 2769 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2770 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2771 hdr->sadb_msg_seq = c->seq; 2772 hdr->sadb_msg_pid = c->portid; 2773 hdr->sadb_msg_version = PF_KEY_V2; 2774 hdr->sadb_msg_errno = (uint8_t) 0; 2775 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2776 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2777 hdr->sadb_msg_reserved = 0; 2778 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2779 return 0; 2780 2781} 2782 2783static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2784{ 2785 struct net *net = sock_net(sk); 2786 struct km_event c; 2787 int err, err2; 2788 2789 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2790 err2 = unicast_flush_resp(sk, hdr); 2791 if (err || err2) { 2792 if (err == -ESRCH) /* empty table - old silent behavior */ 2793 return 0; 2794 return err; 2795 } 2796 2797 c.data.type = XFRM_POLICY_TYPE_MAIN; 2798 c.event = XFRM_MSG_FLUSHPOLICY; 2799 c.portid = hdr->sadb_msg_pid; 2800 c.seq = hdr->sadb_msg_seq; 2801 c.net = net; 2802 km_policy_notify(NULL, 0, &c); 2803 2804 return 0; 2805} 2806 2807typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2808 const struct sadb_msg *hdr, void * const *ext_hdrs); 2809static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2810 [SADB_RESERVED] = pfkey_reserved, 2811 [SADB_GETSPI] = pfkey_getspi, 2812 [SADB_UPDATE] = pfkey_add, 2813 [SADB_ADD] = pfkey_add, 2814 [SADB_DELETE] = pfkey_delete, 2815 [SADB_GET] = pfkey_get, 2816 [SADB_ACQUIRE] = pfkey_acquire, 2817 [SADB_REGISTER] = pfkey_register, 2818 [SADB_EXPIRE] = NULL, 2819 [SADB_FLUSH] = pfkey_flush, 2820 [SADB_DUMP] = pfkey_dump, 2821 [SADB_X_PROMISC] = pfkey_promisc, 2822 [SADB_X_PCHANGE] = NULL, 2823 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2824 [SADB_X_SPDADD] = pfkey_spdadd, 2825 [SADB_X_SPDDELETE] = pfkey_spddelete, 2826 [SADB_X_SPDGET] = pfkey_spdget, 2827 [SADB_X_SPDACQUIRE] = NULL, 2828 [SADB_X_SPDDUMP] = pfkey_spddump, 2829 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2830 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2831 [SADB_X_SPDDELETE2] = pfkey_spdget, 2832 [SADB_X_MIGRATE] = pfkey_migrate, 2833}; 2834 2835static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2836{ 2837 void *ext_hdrs[SADB_EXT_MAX]; 2838 int err; 2839 2840 /* Non-zero return value of pfkey_broadcast() does not always signal 2841 * an error and even on an actual error we may still want to process 2842 * the message so rather ignore the return value. 2843 */ 2844 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2845 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2846 2847 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2848 err = parse_exthdrs(skb, hdr, ext_hdrs); 2849 if (!err) { 2850 err = -EOPNOTSUPP; 2851 if (pfkey_funcs[hdr->sadb_msg_type]) 2852 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2853 } 2854 return err; 2855} 2856 2857static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2858{ 2859 struct sadb_msg *hdr = NULL; 2860 2861 if (skb->len < sizeof(*hdr)) { 2862 *errp = -EMSGSIZE; 2863 } else { 2864 hdr = (struct sadb_msg *) skb->data; 2865 if (hdr->sadb_msg_version != PF_KEY_V2 || 2866 hdr->sadb_msg_reserved != 0 || 2867 (hdr->sadb_msg_type <= SADB_RESERVED || 2868 hdr->sadb_msg_type > SADB_MAX)) { 2869 hdr = NULL; 2870 *errp = -EINVAL; 2871 } else if (hdr->sadb_msg_len != (skb->len / 2872 sizeof(uint64_t)) || 2873 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2874 sizeof(uint64_t))) { 2875 hdr = NULL; 2876 *errp = -EMSGSIZE; 2877 } else { 2878 *errp = 0; 2879 } 2880 } 2881 return hdr; 2882} 2883 2884static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2885 const struct xfrm_algo_desc *d) 2886{ 2887 unsigned int id = d->desc.sadb_alg_id; 2888 2889 if (id >= sizeof(t->aalgos) * 8) 2890 return 0; 2891 2892 return (t->aalgos >> id) & 1; 2893} 2894 2895static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2896 const struct xfrm_algo_desc *d) 2897{ 2898 unsigned int id = d->desc.sadb_alg_id; 2899 2900 if (id >= sizeof(t->ealgos) * 8) 2901 return 0; 2902 2903 return (t->ealgos >> id) & 1; 2904} 2905 2906static int count_ah_combs(const struct xfrm_tmpl *t) 2907{ 2908 int i, sz = 0; 2909 2910 for (i = 0; ; i++) { 2911 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2912 if (!aalg) 2913 break; 2914 if (!aalg->pfkey_supported) 2915 continue; 2916 if (aalg_tmpl_set(t, aalg)) 2917 sz += sizeof(struct sadb_comb); 2918 } 2919 return sz + sizeof(struct sadb_prop); 2920} 2921 2922static int count_esp_combs(const struct xfrm_tmpl *t) 2923{ 2924 int i, k, sz = 0; 2925 2926 for (i = 0; ; i++) { 2927 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2928 if (!ealg) 2929 break; 2930 2931 if (!ealg->pfkey_supported) 2932 continue; 2933 2934 if (!(ealg_tmpl_set(t, ealg))) 2935 continue; 2936 2937 for (k = 1; ; k++) { 2938 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2939 if (!aalg) 2940 break; 2941 2942 if (!aalg->pfkey_supported) 2943 continue; 2944 2945 if (aalg_tmpl_set(t, aalg)) 2946 sz += sizeof(struct sadb_comb); 2947 } 2948 } 2949 return sz + sizeof(struct sadb_prop); 2950} 2951 2952static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2953{ 2954 struct sadb_prop *p; 2955 int sz = 0; 2956 int i; 2957 2958 p = skb_put(skb, sizeof(struct sadb_prop)); 2959 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2960 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2961 p->sadb_prop_replay = 32; 2962 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2963 2964 for (i = 0; ; i++) { 2965 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2966 if (!aalg) 2967 break; 2968 2969 if (!aalg->pfkey_supported) 2970 continue; 2971 2972 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2973 struct sadb_comb *c; 2974 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2975 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2976 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2977 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2978 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2979 c->sadb_comb_hard_addtime = 24*60*60; 2980 c->sadb_comb_soft_addtime = 20*60*60; 2981 c->sadb_comb_hard_usetime = 8*60*60; 2982 c->sadb_comb_soft_usetime = 7*60*60; 2983 sz += sizeof(*c); 2984 } 2985 } 2986 2987 return sz + sizeof(*p); 2988} 2989 2990static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2991{ 2992 struct sadb_prop *p; 2993 int sz = 0; 2994 int i, k; 2995 2996 p = skb_put(skb, sizeof(struct sadb_prop)); 2997 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2998 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2999 p->sadb_prop_replay = 32; 3000 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 3001 3002 for (i=0; ; i++) { 3003 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 3004 if (!ealg) 3005 break; 3006 3007 if (!ealg->pfkey_supported) 3008 continue; 3009 3010 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 3011 continue; 3012 3013 for (k = 1; ; k++) { 3014 struct sadb_comb *c; 3015 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3016 if (!aalg) 3017 break; 3018 if (!aalg->pfkey_supported) 3019 continue; 3020 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3021 continue; 3022 c = skb_put(skb, sizeof(struct sadb_comb)); 3023 memset(c, 0, sizeof(*c)); 3024 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3025 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3026 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3027 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3028 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3029 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3030 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3031 c->sadb_comb_hard_addtime = 24*60*60; 3032 c->sadb_comb_soft_addtime = 20*60*60; 3033 c->sadb_comb_hard_usetime = 8*60*60; 3034 c->sadb_comb_soft_usetime = 7*60*60; 3035 sz += sizeof(*c); 3036 } 3037 } 3038 3039 return sz + sizeof(*p); 3040} 3041 3042static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3043{ 3044 return 0; 3045} 3046 3047static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3048{ 3049 struct sk_buff *out_skb; 3050 struct sadb_msg *out_hdr; 3051 int hard; 3052 int hsc; 3053 3054 hard = c->data.hard; 3055 if (hard) 3056 hsc = 2; 3057 else 3058 hsc = 1; 3059 3060 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3061 if (IS_ERR(out_skb)) 3062 return PTR_ERR(out_skb); 3063 3064 out_hdr = (struct sadb_msg *) out_skb->data; 3065 out_hdr->sadb_msg_version = PF_KEY_V2; 3066 out_hdr->sadb_msg_type = SADB_EXPIRE; 3067 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3068 out_hdr->sadb_msg_errno = 0; 3069 out_hdr->sadb_msg_reserved = 0; 3070 out_hdr->sadb_msg_seq = 0; 3071 out_hdr->sadb_msg_pid = 0; 3072 3073 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3074 xs_net(x)); 3075 return 0; 3076} 3077 3078static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3079{ 3080 struct net *net = x ? xs_net(x) : c->net; 3081 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3082 3083 if (atomic_read(&net_pfkey->socks_nr) == 0) 3084 return 0; 3085 3086 switch (c->event) { 3087 case XFRM_MSG_EXPIRE: 3088 return key_notify_sa_expire(x, c); 3089 case XFRM_MSG_DELSA: 3090 case XFRM_MSG_NEWSA: 3091 case XFRM_MSG_UPDSA: 3092 return key_notify_sa(x, c); 3093 case XFRM_MSG_FLUSHSA: 3094 return key_notify_sa_flush(c); 3095 case XFRM_MSG_NEWAE: /* not yet supported */ 3096 break; 3097 default: 3098 pr_err("pfkey: Unknown SA event %d\n", c->event); 3099 break; 3100 } 3101 3102 return 0; 3103} 3104 3105static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3106{ 3107 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3108 return 0; 3109 3110 switch (c->event) { 3111 case XFRM_MSG_POLEXPIRE: 3112 return key_notify_policy_expire(xp, c); 3113 case XFRM_MSG_DELPOLICY: 3114 case XFRM_MSG_NEWPOLICY: 3115 case XFRM_MSG_UPDPOLICY: 3116 return key_notify_policy(xp, dir, c); 3117 case XFRM_MSG_FLUSHPOLICY: 3118 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3119 break; 3120 return key_notify_policy_flush(c); 3121 default: 3122 pr_err("pfkey: Unknown policy event %d\n", c->event); 3123 break; 3124 } 3125 3126 return 0; 3127} 3128 3129static u32 get_acqseq(void) 3130{ 3131 u32 res; 3132 static atomic_t acqseq; 3133 3134 do { 3135 res = atomic_inc_return(&acqseq); 3136 } while (!res); 3137 return res; 3138} 3139 3140static bool pfkey_is_alive(const struct km_event *c) 3141{ 3142 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3143 struct sock *sk; 3144 bool is_alive = false; 3145 3146 rcu_read_lock(); 3147 sk_for_each_rcu(sk, &net_pfkey->table) { 3148 if (pfkey_sk(sk)->registered) { 3149 is_alive = true; 3150 break; 3151 } 3152 } 3153 rcu_read_unlock(); 3154 3155 return is_alive; 3156} 3157 3158static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3159{ 3160 struct sk_buff *skb; 3161 struct sadb_msg *hdr; 3162 struct sadb_address *addr; 3163 struct sadb_x_policy *pol; 3164 int sockaddr_size; 3165 int size; 3166 struct sadb_x_sec_ctx *sec_ctx; 3167 struct xfrm_sec_ctx *xfrm_ctx; 3168 int ctx_size = 0; 3169 int alg_size = 0; 3170 3171 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3172 if (!sockaddr_size) 3173 return -EINVAL; 3174 3175 size = sizeof(struct sadb_msg) + 3176 (sizeof(struct sadb_address) * 2) + 3177 (sockaddr_size * 2) + 3178 sizeof(struct sadb_x_policy); 3179 3180 if (x->id.proto == IPPROTO_AH) 3181 alg_size = count_ah_combs(t); 3182 else if (x->id.proto == IPPROTO_ESP) 3183 alg_size = count_esp_combs(t); 3184 3185 if ((xfrm_ctx = x->security)) { 3186 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3187 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3188 } 3189 3190 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC); 3191 if (skb == NULL) 3192 return -ENOMEM; 3193 3194 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3195 hdr->sadb_msg_version = PF_KEY_V2; 3196 hdr->sadb_msg_type = SADB_ACQUIRE; 3197 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3198 hdr->sadb_msg_len = size / sizeof(uint64_t); 3199 hdr->sadb_msg_errno = 0; 3200 hdr->sadb_msg_reserved = 0; 3201 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3202 hdr->sadb_msg_pid = 0; 3203 3204 /* src address */ 3205 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3206 addr->sadb_address_len = 3207 (sizeof(struct sadb_address)+sockaddr_size)/ 3208 sizeof(uint64_t); 3209 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3210 addr->sadb_address_proto = 0; 3211 addr->sadb_address_reserved = 0; 3212 addr->sadb_address_prefixlen = 3213 pfkey_sockaddr_fill(&x->props.saddr, 0, 3214 (struct sockaddr *) (addr + 1), 3215 x->props.family); 3216 if (!addr->sadb_address_prefixlen) 3217 BUG(); 3218 3219 /* dst address */ 3220 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3221 addr->sadb_address_len = 3222 (sizeof(struct sadb_address)+sockaddr_size)/ 3223 sizeof(uint64_t); 3224 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3225 addr->sadb_address_proto = 0; 3226 addr->sadb_address_reserved = 0; 3227 addr->sadb_address_prefixlen = 3228 pfkey_sockaddr_fill(&x->id.daddr, 0, 3229 (struct sockaddr *) (addr + 1), 3230 x->props.family); 3231 if (!addr->sadb_address_prefixlen) 3232 BUG(); 3233 3234 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3235 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3236 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3237 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3238 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3239 pol->sadb_x_policy_reserved = 0; 3240 pol->sadb_x_policy_id = xp->index; 3241 pol->sadb_x_policy_priority = xp->priority; 3242 3243 /* Set sadb_comb's. */ 3244 alg_size = 0; 3245 if (x->id.proto == IPPROTO_AH) 3246 alg_size = dump_ah_combs(skb, t); 3247 else if (x->id.proto == IPPROTO_ESP) 3248 alg_size = dump_esp_combs(skb, t); 3249 3250 hdr->sadb_msg_len += alg_size / 8; 3251 3252 /* security context */ 3253 if (xfrm_ctx) { 3254 sec_ctx = skb_put(skb, 3255 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3256 sec_ctx->sadb_x_sec_len = 3257 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3258 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3259 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3260 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3261 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3262 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3263 xfrm_ctx->ctx_len); 3264 } 3265 3266 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3267 xs_net(x)); 3268} 3269 3270static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3271 u8 *data, int len, int *dir) 3272{ 3273 struct net *net = sock_net(sk); 3274 struct xfrm_policy *xp; 3275 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3276 struct sadb_x_sec_ctx *sec_ctx; 3277 3278 switch (sk->sk_family) { 3279 case AF_INET: 3280 if (opt != IP_IPSEC_POLICY) { 3281 *dir = -EOPNOTSUPP; 3282 return NULL; 3283 } 3284 break; 3285#if IS_ENABLED(CONFIG_IPV6) 3286 case AF_INET6: 3287 if (opt != IPV6_IPSEC_POLICY) { 3288 *dir = -EOPNOTSUPP; 3289 return NULL; 3290 } 3291 break; 3292#endif 3293 default: 3294 *dir = -EINVAL; 3295 return NULL; 3296 } 3297 3298 *dir = -EINVAL; 3299 3300 if (len < sizeof(struct sadb_x_policy) || 3301 pol->sadb_x_policy_len*8 > len || 3302 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3303 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3304 return NULL; 3305 3306 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3307 if (xp == NULL) { 3308 *dir = -ENOBUFS; 3309 return NULL; 3310 } 3311 3312 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3313 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3314 3315 xp->lft.soft_byte_limit = XFRM_INF; 3316 xp->lft.hard_byte_limit = XFRM_INF; 3317 xp->lft.soft_packet_limit = XFRM_INF; 3318 xp->lft.hard_packet_limit = XFRM_INF; 3319 xp->family = sk->sk_family; 3320 3321 xp->xfrm_nr = 0; 3322 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3323 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3324 goto out; 3325 3326 /* security context too */ 3327 if (len >= (pol->sadb_x_policy_len*8 + 3328 sizeof(struct sadb_x_sec_ctx))) { 3329 char *p = (char *)pol; 3330 struct xfrm_user_sec_ctx *uctx; 3331 3332 p += pol->sadb_x_policy_len*8; 3333 sec_ctx = (struct sadb_x_sec_ctx *)p; 3334 if (len < pol->sadb_x_policy_len*8 + 3335 sec_ctx->sadb_x_sec_len*8) { 3336 *dir = -EINVAL; 3337 goto out; 3338 } 3339 if ((*dir = verify_sec_ctx_len(p))) 3340 goto out; 3341 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3342 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3343 kfree(uctx); 3344 3345 if (*dir) 3346 goto out; 3347 } 3348 3349 *dir = pol->sadb_x_policy_dir-1; 3350 return xp; 3351 3352out: 3353 xp->walk.dead = 1; 3354 xfrm_policy_destroy(xp); 3355 return NULL; 3356} 3357 3358static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3359{ 3360 struct sk_buff *skb; 3361 struct sadb_msg *hdr; 3362 struct sadb_sa *sa; 3363 struct sadb_address *addr; 3364 struct sadb_x_nat_t_port *n_port; 3365 int sockaddr_size; 3366 int size; 3367 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3368 struct xfrm_encap_tmpl *natt = NULL; 3369 3370 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3371 if (!sockaddr_size) 3372 return -EINVAL; 3373 3374 if (!satype) 3375 return -EINVAL; 3376 3377 if (!x->encap) 3378 return -EINVAL; 3379 3380 natt = x->encap; 3381 3382 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3383 * 3384 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3385 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3386 */ 3387 3388 size = sizeof(struct sadb_msg) + 3389 sizeof(struct sadb_sa) + 3390 (sizeof(struct sadb_address) * 2) + 3391 (sockaddr_size * 2) + 3392 (sizeof(struct sadb_x_nat_t_port) * 2); 3393 3394 skb = alloc_skb(size + 16, GFP_ATOMIC); 3395 if (skb == NULL) 3396 return -ENOMEM; 3397 3398 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3399 hdr->sadb_msg_version = PF_KEY_V2; 3400 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3401 hdr->sadb_msg_satype = satype; 3402 hdr->sadb_msg_len = size / sizeof(uint64_t); 3403 hdr->sadb_msg_errno = 0; 3404 hdr->sadb_msg_reserved = 0; 3405 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3406 hdr->sadb_msg_pid = 0; 3407 3408 /* SA */ 3409 sa = skb_put(skb, sizeof(struct sadb_sa)); 3410 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3411 sa->sadb_sa_exttype = SADB_EXT_SA; 3412 sa->sadb_sa_spi = x->id.spi; 3413 sa->sadb_sa_replay = 0; 3414 sa->sadb_sa_state = 0; 3415 sa->sadb_sa_auth = 0; 3416 sa->sadb_sa_encrypt = 0; 3417 sa->sadb_sa_flags = 0; 3418 3419 /* ADDRESS_SRC (old addr) */ 3420 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3421 addr->sadb_address_len = 3422 (sizeof(struct sadb_address)+sockaddr_size)/ 3423 sizeof(uint64_t); 3424 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3425 addr->sadb_address_proto = 0; 3426 addr->sadb_address_reserved = 0; 3427 addr->sadb_address_prefixlen = 3428 pfkey_sockaddr_fill(&x->props.saddr, 0, 3429 (struct sockaddr *) (addr + 1), 3430 x->props.family); 3431 if (!addr->sadb_address_prefixlen) 3432 BUG(); 3433 3434 /* NAT_T_SPORT (old port) */ 3435 n_port = skb_put(skb, sizeof(*n_port)); 3436 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3437 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3438 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3439 n_port->sadb_x_nat_t_port_reserved = 0; 3440 3441 /* ADDRESS_DST (new addr) */ 3442 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3443 addr->sadb_address_len = 3444 (sizeof(struct sadb_address)+sockaddr_size)/ 3445 sizeof(uint64_t); 3446 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3447 addr->sadb_address_proto = 0; 3448 addr->sadb_address_reserved = 0; 3449 addr->sadb_address_prefixlen = 3450 pfkey_sockaddr_fill(ipaddr, 0, 3451 (struct sockaddr *) (addr + 1), 3452 x->props.family); 3453 if (!addr->sadb_address_prefixlen) 3454 BUG(); 3455 3456 /* NAT_T_DPORT (new port) */ 3457 n_port = skb_put(skb, sizeof(*n_port)); 3458 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3459 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3460 n_port->sadb_x_nat_t_port_port = sport; 3461 n_port->sadb_x_nat_t_port_reserved = 0; 3462 3463 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3464 xs_net(x)); 3465} 3466 3467#ifdef CONFIG_NET_KEY_MIGRATE 3468static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3469 const struct xfrm_selector *sel) 3470{ 3471 struct sadb_address *addr; 3472 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3473 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3474 addr->sadb_address_exttype = type; 3475 addr->sadb_address_proto = sel->proto; 3476 addr->sadb_address_reserved = 0; 3477 3478 switch (type) { 3479 case SADB_EXT_ADDRESS_SRC: 3480 addr->sadb_address_prefixlen = sel->prefixlen_s; 3481 pfkey_sockaddr_fill(&sel->saddr, 0, 3482 (struct sockaddr *)(addr + 1), 3483 sel->family); 3484 break; 3485 case SADB_EXT_ADDRESS_DST: 3486 addr->sadb_address_prefixlen = sel->prefixlen_d; 3487 pfkey_sockaddr_fill(&sel->daddr, 0, 3488 (struct sockaddr *)(addr + 1), 3489 sel->family); 3490 break; 3491 default: 3492 return -EINVAL; 3493 } 3494 3495 return 0; 3496} 3497 3498 3499static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3500{ 3501 struct sadb_x_kmaddress *kma; 3502 u8 *sa; 3503 int family = k->family; 3504 int socklen = pfkey_sockaddr_len(family); 3505 int size_req; 3506 3507 size_req = (sizeof(struct sadb_x_kmaddress) + 3508 pfkey_sockaddr_pair_size(family)); 3509 3510 kma = skb_put_zero(skb, size_req); 3511 kma->sadb_x_kmaddress_len = size_req / 8; 3512 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3513 kma->sadb_x_kmaddress_reserved = k->reserved; 3514 3515 sa = (u8 *)(kma + 1); 3516 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3517 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3518 return -EINVAL; 3519 3520 return 0; 3521} 3522 3523static int set_ipsecrequest(struct sk_buff *skb, 3524 uint8_t proto, uint8_t mode, int level, 3525 uint32_t reqid, uint8_t family, 3526 const xfrm_address_t *src, const xfrm_address_t *dst) 3527{ 3528 struct sadb_x_ipsecrequest *rq; 3529 u8 *sa; 3530 int socklen = pfkey_sockaddr_len(family); 3531 int size_req; 3532 3533 size_req = sizeof(struct sadb_x_ipsecrequest) + 3534 pfkey_sockaddr_pair_size(family); 3535 3536 rq = skb_put_zero(skb, size_req); 3537 rq->sadb_x_ipsecrequest_len = size_req; 3538 rq->sadb_x_ipsecrequest_proto = proto; 3539 rq->sadb_x_ipsecrequest_mode = mode; 3540 rq->sadb_x_ipsecrequest_level = level; 3541 rq->sadb_x_ipsecrequest_reqid = reqid; 3542 3543 sa = (u8 *) (rq + 1); 3544 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3545 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3546 return -EINVAL; 3547 3548 return 0; 3549} 3550#endif 3551 3552#ifdef CONFIG_NET_KEY_MIGRATE 3553static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3554 const struct xfrm_migrate *m, int num_bundles, 3555 const struct xfrm_kmaddress *k, 3556 const struct xfrm_encap_tmpl *encap) 3557{ 3558 int i; 3559 int sasize_sel; 3560 int size = 0; 3561 int size_pol = 0; 3562 struct sk_buff *skb; 3563 struct sadb_msg *hdr; 3564 struct sadb_x_policy *pol; 3565 const struct xfrm_migrate *mp; 3566 3567 if (type != XFRM_POLICY_TYPE_MAIN) 3568 return 0; 3569 3570 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3571 return -EINVAL; 3572 3573 if (k != NULL) { 3574 /* addresses for KM */ 3575 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3576 pfkey_sockaddr_pair_size(k->family)); 3577 } 3578 3579 /* selector */ 3580 sasize_sel = pfkey_sockaddr_size(sel->family); 3581 if (!sasize_sel) 3582 return -EINVAL; 3583 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3584 3585 /* policy info */ 3586 size_pol += sizeof(struct sadb_x_policy); 3587 3588 /* ipsecrequests */ 3589 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3590 /* old locator pair */ 3591 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3592 pfkey_sockaddr_pair_size(mp->old_family); 3593 /* new locator pair */ 3594 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3595 pfkey_sockaddr_pair_size(mp->new_family); 3596 } 3597 3598 size += sizeof(struct sadb_msg) + size_pol; 3599 3600 /* alloc buffer */ 3601 skb = alloc_skb(size, GFP_ATOMIC); 3602 if (skb == NULL) 3603 return -ENOMEM; 3604 3605 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3606 hdr->sadb_msg_version = PF_KEY_V2; 3607 hdr->sadb_msg_type = SADB_X_MIGRATE; 3608 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3609 hdr->sadb_msg_len = size / 8; 3610 hdr->sadb_msg_errno = 0; 3611 hdr->sadb_msg_reserved = 0; 3612 hdr->sadb_msg_seq = 0; 3613 hdr->sadb_msg_pid = 0; 3614 3615 /* Addresses to be used by KM for negotiation, if ext is available */ 3616 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3617 goto err; 3618 3619 /* selector src */ 3620 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3621 3622 /* selector dst */ 3623 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3624 3625 /* policy information */ 3626 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3627 pol->sadb_x_policy_len = size_pol / 8; 3628 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3629 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3630 pol->sadb_x_policy_dir = dir + 1; 3631 pol->sadb_x_policy_reserved = 0; 3632 pol->sadb_x_policy_id = 0; 3633 pol->sadb_x_policy_priority = 0; 3634 3635 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3636 /* old ipsecrequest */ 3637 int mode = pfkey_mode_from_xfrm(mp->mode); 3638 if (mode < 0) 3639 goto err; 3640 if (set_ipsecrequest(skb, mp->proto, mode, 3641 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3642 mp->reqid, mp->old_family, 3643 &mp->old_saddr, &mp->old_daddr) < 0) 3644 goto err; 3645 3646 /* new ipsecrequest */ 3647 if (set_ipsecrequest(skb, mp->proto, mode, 3648 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3649 mp->reqid, mp->new_family, 3650 &mp->new_saddr, &mp->new_daddr) < 0) 3651 goto err; 3652 } 3653 3654 /* broadcast migrate message to sockets */ 3655 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3656 3657 return 0; 3658 3659err: 3660 kfree_skb(skb); 3661 return -EINVAL; 3662} 3663#else 3664static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3665 const struct xfrm_migrate *m, int num_bundles, 3666 const struct xfrm_kmaddress *k, 3667 const struct xfrm_encap_tmpl *encap) 3668{ 3669 return -ENOPROTOOPT; 3670} 3671#endif 3672 3673static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3674{ 3675 struct sock *sk = sock->sk; 3676 struct sk_buff *skb = NULL; 3677 struct sadb_msg *hdr = NULL; 3678 int err; 3679 struct net *net = sock_net(sk); 3680 3681 err = -EOPNOTSUPP; 3682 if (msg->msg_flags & MSG_OOB) 3683 goto out; 3684 3685 err = -EMSGSIZE; 3686 if ((unsigned int)len > sk->sk_sndbuf - 32) 3687 goto out; 3688 3689 err = -ENOBUFS; 3690 skb = alloc_skb(len, GFP_KERNEL); 3691 if (skb == NULL) 3692 goto out; 3693 3694 err = -EFAULT; 3695 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3696 goto out; 3697 3698 hdr = pfkey_get_base_msg(skb, &err); 3699 if (!hdr) 3700 goto out; 3701 3702 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3703 err = pfkey_process(sk, skb, hdr); 3704 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3705 3706out: 3707 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3708 err = 0; 3709 kfree_skb(skb); 3710 3711 return err ? : len; 3712} 3713 3714static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3715 int flags) 3716{ 3717 struct sock *sk = sock->sk; 3718 struct pfkey_sock *pfk = pfkey_sk(sk); 3719 struct sk_buff *skb; 3720 int copied, err; 3721 3722 err = -EINVAL; 3723 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3724 goto out; 3725 3726 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3727 if (skb == NULL) 3728 goto out; 3729 3730 copied = skb->len; 3731 if (copied > len) { 3732 msg->msg_flags |= MSG_TRUNC; 3733 copied = len; 3734 } 3735 3736 skb_reset_transport_header(skb); 3737 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3738 if (err) 3739 goto out_free; 3740 3741 sock_recv_ts_and_drops(msg, sk, skb); 3742 3743 err = (flags & MSG_TRUNC) ? skb->len : copied; 3744 3745 if (pfk->dump.dump != NULL && 3746 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3747 pfkey_do_dump(pfk); 3748 3749out_free: 3750 skb_free_datagram(sk, skb); 3751out: 3752 return err; 3753} 3754 3755static const struct proto_ops pfkey_ops = { 3756 .family = PF_KEY, 3757 .owner = THIS_MODULE, 3758 /* Operations that make no sense on pfkey sockets. */ 3759 .bind = sock_no_bind, 3760 .connect = sock_no_connect, 3761 .socketpair = sock_no_socketpair, 3762 .accept = sock_no_accept, 3763 .getname = sock_no_getname, 3764 .ioctl = sock_no_ioctl, 3765 .listen = sock_no_listen, 3766 .shutdown = sock_no_shutdown, 3767 .mmap = sock_no_mmap, 3768 .sendpage = sock_no_sendpage, 3769 3770 /* Now the operations that really occur. */ 3771 .release = pfkey_release, 3772 .poll = datagram_poll, 3773 .sendmsg = pfkey_sendmsg, 3774 .recvmsg = pfkey_recvmsg, 3775}; 3776 3777static const struct net_proto_family pfkey_family_ops = { 3778 .family = PF_KEY, 3779 .create = pfkey_create, 3780 .owner = THIS_MODULE, 3781}; 3782 3783#ifdef CONFIG_PROC_FS 3784static int pfkey_seq_show(struct seq_file *f, void *v) 3785{ 3786 struct sock *s = sk_entry(v); 3787 3788 if (v == SEQ_START_TOKEN) 3789 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3790 else 3791 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3792 s, 3793 refcount_read(&s->sk_refcnt), 3794 sk_rmem_alloc_get(s), 3795 sk_wmem_alloc_get(s), 3796 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3797 sock_i_ino(s) 3798 ); 3799 return 0; 3800} 3801 3802static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3803 __acquires(rcu) 3804{ 3805 struct net *net = seq_file_net(f); 3806 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3807 3808 rcu_read_lock(); 3809 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3810} 3811 3812static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3813{ 3814 struct net *net = seq_file_net(f); 3815 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3816 3817 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3818} 3819 3820static void pfkey_seq_stop(struct seq_file *f, void *v) 3821 __releases(rcu) 3822{ 3823 rcu_read_unlock(); 3824} 3825 3826static const struct seq_operations pfkey_seq_ops = { 3827 .start = pfkey_seq_start, 3828 .next = pfkey_seq_next, 3829 .stop = pfkey_seq_stop, 3830 .show = pfkey_seq_show, 3831}; 3832 3833static int __net_init pfkey_init_proc(struct net *net) 3834{ 3835 struct proc_dir_entry *e; 3836 3837 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3838 sizeof(struct seq_net_private)); 3839 if (e == NULL) 3840 return -ENOMEM; 3841 3842 return 0; 3843} 3844 3845static void __net_exit pfkey_exit_proc(struct net *net) 3846{ 3847 remove_proc_entry("pfkey", net->proc_net); 3848} 3849#else 3850static inline int pfkey_init_proc(struct net *net) 3851{ 3852 return 0; 3853} 3854 3855static inline void pfkey_exit_proc(struct net *net) 3856{ 3857} 3858#endif 3859 3860static struct xfrm_mgr pfkeyv2_mgr = 3861{ 3862 .notify = pfkey_send_notify, 3863 .acquire = pfkey_send_acquire, 3864 .compile_policy = pfkey_compile_policy, 3865 .new_mapping = pfkey_send_new_mapping, 3866 .notify_policy = pfkey_send_policy_notify, 3867 .migrate = pfkey_send_migrate, 3868 .is_alive = pfkey_is_alive, 3869}; 3870 3871static int __net_init pfkey_net_init(struct net *net) 3872{ 3873 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3874 int rv; 3875 3876 INIT_HLIST_HEAD(&net_pfkey->table); 3877 atomic_set(&net_pfkey->socks_nr, 0); 3878 3879 rv = pfkey_init_proc(net); 3880 3881 return rv; 3882} 3883 3884static void __net_exit pfkey_net_exit(struct net *net) 3885{ 3886 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3887 3888 pfkey_exit_proc(net); 3889 WARN_ON(!hlist_empty(&net_pfkey->table)); 3890} 3891 3892static struct pernet_operations pfkey_net_ops = { 3893 .init = pfkey_net_init, 3894 .exit = pfkey_net_exit, 3895 .id = &pfkey_net_id, 3896 .size = sizeof(struct netns_pfkey), 3897}; 3898 3899static void __exit ipsec_pfkey_exit(void) 3900{ 3901 xfrm_unregister_km(&pfkeyv2_mgr); 3902 sock_unregister(PF_KEY); 3903 unregister_pernet_subsys(&pfkey_net_ops); 3904 proto_unregister(&key_proto); 3905} 3906 3907static int __init ipsec_pfkey_init(void) 3908{ 3909 int err = proto_register(&key_proto, 0); 3910 3911 if (err != 0) 3912 goto out; 3913 3914 err = register_pernet_subsys(&pfkey_net_ops); 3915 if (err != 0) 3916 goto out_unregister_key_proto; 3917 err = sock_register(&pfkey_family_ops); 3918 if (err != 0) 3919 goto out_unregister_pernet; 3920 err = xfrm_register_km(&pfkeyv2_mgr); 3921 if (err != 0) 3922 goto out_sock_unregister; 3923out: 3924 return err; 3925 3926out_sock_unregister: 3927 sock_unregister(PF_KEY); 3928out_unregister_pernet: 3929 unregister_pernet_subsys(&pfkey_net_ops); 3930out_unregister_key_proto: 3931 proto_unregister(&key_proto); 3932 goto out; 3933} 3934 3935module_init(ipsec_pfkey_init); 3936module_exit(ipsec_pfkey_exit); 3937MODULE_LICENSE("GPL"); 3938MODULE_ALIAS_NETPROTO(PF_KEY); 3939