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af_key.c
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linux-6.19.14/net/key/af_key.c
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; 144 145 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 146 return -EPERM; 147 if (sock->type != SOCK_RAW) 148 return -ESOCKTNOSUPPORT; 149 if (protocol != PF_KEY_V2) 150 return -EPROTONOSUPPORT; 151 152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern); 153 if (sk == NULL) 154 return -ENOMEM; 155 156 pfk = pfkey_sk(sk); 157 mutex_init(&pfk->dump_lock); 158 159 sock->ops = &pfkey_ops; 160 sock_init_data(sock, sk); 161 162 sk->sk_family = PF_KEY; 163 sk->sk_destruct = pfkey_sock_destruct; 164 165 atomic_inc(&net_pfkey->socks_nr); 166 167 pfkey_insert(sk); 168 169 return 0; 170} 171 172static int pfkey_release(struct socket *sock) 173{ 174 struct sock *sk = sock->sk; 175 176 if (!sk) 177 return 0; 178 179 pfkey_remove(sk); 180 181 sock_orphan(sk); 182 sock->sk = NULL; 183 skb_queue_purge(&sk->sk_write_queue); 184 185 synchronize_rcu(); 186 sock_put(sk); 187 188 return 0; 189} 190 191static int pfkey_broadcast_one(struct sk_buff *skb, gfp_t allocation, 192 struct sock *sk) 193{ 194 int err = -ENOBUFS; 195 196 if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf) 197 return err; 198 199 skb = skb_clone(skb, allocation); 200 201 if (skb) { 202 skb_set_owner_r(skb, sk); 203 skb_queue_tail(&sk->sk_receive_queue, skb); 204 sk->sk_data_ready(sk); 205 err = 0; 206 } 207 return err; 208} 209 210/* Send SKB to all pfkey sockets matching selected criteria. */ 211#define BROADCAST_ALL 0 212#define BROADCAST_ONE 1 213#define BROADCAST_REGISTERED 2 214#define BROADCAST_PROMISC_ONLY 4 215static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 216 int broadcast_flags, struct sock *one_sk, 217 struct net *net) 218{ 219 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 220 struct sock *sk; 221 int err = -ESRCH; 222 223 /* XXX Do we need something like netlink_overrun? I think 224 * XXX PF_KEY socket apps will not mind current behavior. 225 */ 226 if (!skb) 227 return -ENOMEM; 228 229 rcu_read_lock(); 230 sk_for_each_rcu(sk, &net_pfkey->table) { 231 struct pfkey_sock *pfk = pfkey_sk(sk); 232 int err2; 233 234 /* Yes, it means that if you are meant to receive this 235 * pfkey message you receive it twice as promiscuous 236 * socket. 237 */ 238 if (pfk->promisc) 239 pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 240 241 /* the exact target will be processed later */ 242 if (sk == one_sk) 243 continue; 244 if (broadcast_flags != BROADCAST_ALL) { 245 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 246 continue; 247 if ((broadcast_flags & BROADCAST_REGISTERED) && 248 !pfk->registered) 249 continue; 250 if (broadcast_flags & BROADCAST_ONE) 251 continue; 252 } 253 254 err2 = pfkey_broadcast_one(skb, GFP_ATOMIC, sk); 255 256 /* Error is cleared after successful sending to at least one 257 * registered KM */ 258 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 259 err = err2; 260 } 261 rcu_read_unlock(); 262 263 if (one_sk != NULL) 264 err = pfkey_broadcast_one(skb, allocation, one_sk); 265 266 kfree_skb(skb); 267 return err; 268} 269 270static int pfkey_do_dump(struct pfkey_sock *pfk) 271{ 272 struct sadb_msg *hdr; 273 int rc; 274 275 mutex_lock(&pfk->dump_lock); 276 if (!pfk->dump.dump) { 277 rc = 0; 278 goto out; 279 } 280 281 rc = pfk->dump.dump(pfk); 282 if (rc == -ENOBUFS) { 283 rc = 0; 284 goto out; 285 } 286 287 if (pfk->dump.skb) { 288 if (!pfkey_can_dump(&pfk->sk)) { 289 rc = 0; 290 goto out; 291 } 292 293 hdr = (struct sadb_msg *) pfk->dump.skb->data; 294 hdr->sadb_msg_seq = 0; 295 hdr->sadb_msg_errno = rc; 296 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 297 &pfk->sk, sock_net(&pfk->sk)); 298 pfk->dump.skb = NULL; 299 } 300 301 pfkey_terminate_dump(pfk); 302 303out: 304 mutex_unlock(&pfk->dump_lock); 305 return rc; 306} 307 308static inline void pfkey_hdr_dup(struct sadb_msg *new, 309 const struct sadb_msg *orig) 310{ 311 *new = *orig; 312} 313 314static int pfkey_error(const struct sadb_msg *orig, int err, struct sock *sk) 315{ 316 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 317 struct sadb_msg *hdr; 318 319 if (!skb) 320 return -ENOBUFS; 321 322 /* Woe be to the platform trying to support PFKEY yet 323 * having normal errnos outside the 1-255 range, inclusive. 324 */ 325 err = -err; 326 if (err == ERESTARTSYS || 327 err == ERESTARTNOHAND || 328 err == ERESTARTNOINTR) 329 err = EINTR; 330 if (err >= 512) 331 err = EINVAL; 332 BUG_ON(err <= 0 || err >= 256); 333 334 hdr = skb_put(skb, sizeof(struct sadb_msg)); 335 pfkey_hdr_dup(hdr, orig); 336 hdr->sadb_msg_errno = (uint8_t) err; 337 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 338 sizeof(uint64_t)); 339 340 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk, sock_net(sk)); 341 342 return 0; 343} 344 345static const u8 sadb_ext_min_len[] = { 346 [SADB_EXT_RESERVED] = (u8) 0, 347 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 348 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 349 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 350 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 351 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 352 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 353 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 354 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 355 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 356 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 357 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 358 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 359 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 360 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 361 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 362 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 363 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 364 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 365 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 366 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 367 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 368 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 369 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 370 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 371 [SADB_X_EXT_KMADDRESS] = (u8) sizeof(struct sadb_x_kmaddress), 372 [SADB_X_EXT_FILTER] = (u8) sizeof(struct sadb_x_filter), 373}; 374 375/* Verify sadb_address_{len,prefixlen} against sa_family. */ 376static int verify_address_len(const void *p) 377{ 378 const struct sadb_address *sp = p; 379 const struct sockaddr *addr = (const struct sockaddr *)(sp + 1); 380 const struct sockaddr_in *sin; 381#if IS_ENABLED(CONFIG_IPV6) 382 const struct sockaddr_in6 *sin6; 383#endif 384 int len; 385 386 if (sp->sadb_address_len < 387 DIV_ROUND_UP(sizeof(*sp) + offsetofend(typeof(*addr), sa_family), 388 sizeof(uint64_t))) 389 return -EINVAL; 390 391 switch (addr->sa_family) { 392 case AF_INET: 393 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin), sizeof(uint64_t)); 394 if (sp->sadb_address_len != len || 395 sp->sadb_address_prefixlen > 32) 396 return -EINVAL; 397 break; 398#if IS_ENABLED(CONFIG_IPV6) 399 case AF_INET6: 400 len = DIV_ROUND_UP(sizeof(*sp) + sizeof(*sin6), sizeof(uint64_t)); 401 if (sp->sadb_address_len != len || 402 sp->sadb_address_prefixlen > 128) 403 return -EINVAL; 404 break; 405#endif 406 default: 407 /* It is user using kernel to keep track of security 408 * associations for another protocol, such as 409 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 410 * lengths. 411 * 412 * XXX Actually, association/policy database is not yet 413 * XXX able to cope with arbitrary sockaddr families. 414 * XXX When it can, remove this -EINVAL. -DaveM 415 */ 416 return -EINVAL; 417 } 418 419 return 0; 420} 421 422static inline int sadb_key_len(const struct sadb_key *key) 423{ 424 int key_bytes = DIV_ROUND_UP(key->sadb_key_bits, 8); 425 426 return DIV_ROUND_UP(sizeof(struct sadb_key) + key_bytes, 427 sizeof(uint64_t)); 428} 429 430static int verify_key_len(const void *p) 431{ 432 const struct sadb_key *key = p; 433 434 if (sadb_key_len(key) > key->sadb_key_len) 435 return -EINVAL; 436 437 return 0; 438} 439 440static inline int pfkey_sec_ctx_len(const struct sadb_x_sec_ctx *sec_ctx) 441{ 442 return DIV_ROUND_UP(sizeof(struct sadb_x_sec_ctx) + 443 sec_ctx->sadb_x_ctx_len, 444 sizeof(uint64_t)); 445} 446 447static inline int verify_sec_ctx_len(const void *p) 448{ 449 const struct sadb_x_sec_ctx *sec_ctx = p; 450 int len = sec_ctx->sadb_x_ctx_len; 451 452 if (len > PAGE_SIZE) 453 return -EINVAL; 454 455 len = pfkey_sec_ctx_len(sec_ctx); 456 457 if (sec_ctx->sadb_x_sec_len != len) 458 return -EINVAL; 459 460 return 0; 461} 462 463static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(const struct sadb_x_sec_ctx *sec_ctx, 464 gfp_t gfp) 465{ 466 struct xfrm_user_sec_ctx *uctx = NULL; 467 int ctx_size = sec_ctx->sadb_x_ctx_len; 468 469 uctx = kmalloc((sizeof(*uctx)+ctx_size), gfp); 470 471 if (!uctx) 472 return NULL; 473 474 uctx->len = pfkey_sec_ctx_len(sec_ctx); 475 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 476 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 477 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 478 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 479 memcpy(uctx + 1, sec_ctx + 1, 480 uctx->ctx_len); 481 482 return uctx; 483} 484 485static int present_and_same_family(const struct sadb_address *src, 486 const struct sadb_address *dst) 487{ 488 const struct sockaddr *s_addr, *d_addr; 489 490 if (!src || !dst) 491 return 0; 492 493 s_addr = (const struct sockaddr *)(src + 1); 494 d_addr = (const struct sockaddr *)(dst + 1); 495 if (s_addr->sa_family != d_addr->sa_family) 496 return 0; 497 if (s_addr->sa_family != AF_INET 498#if IS_ENABLED(CONFIG_IPV6) 499 && s_addr->sa_family != AF_INET6 500#endif 501 ) 502 return 0; 503 504 return 1; 505} 506 507static int parse_exthdrs(struct sk_buff *skb, const struct sadb_msg *hdr, void **ext_hdrs) 508{ 509 const char *p = (char *) hdr; 510 int len = skb->len; 511 512 len -= sizeof(*hdr); 513 p += sizeof(*hdr); 514 while (len > 0) { 515 const struct sadb_ext *ehdr = (const struct sadb_ext *) p; 516 uint16_t ext_type; 517 int ext_len; 518 519 if (len < sizeof(*ehdr)) 520 return -EINVAL; 521 522 ext_len = ehdr->sadb_ext_len; 523 ext_len *= sizeof(uint64_t); 524 ext_type = ehdr->sadb_ext_type; 525 if (ext_len < sizeof(uint64_t) || 526 ext_len > len || 527 ext_type == SADB_EXT_RESERVED) 528 return -EINVAL; 529 530 if (ext_type <= SADB_EXT_MAX) { 531 int min = (int) sadb_ext_min_len[ext_type]; 532 if (ext_len < min) 533 return -EINVAL; 534 if (ext_hdrs[ext_type-1] != NULL) 535 return -EINVAL; 536 switch (ext_type) { 537 case SADB_EXT_ADDRESS_SRC: 538 case SADB_EXT_ADDRESS_DST: 539 case SADB_EXT_ADDRESS_PROXY: 540 case SADB_X_EXT_NAT_T_OA: 541 if (verify_address_len(p)) 542 return -EINVAL; 543 break; 544 case SADB_X_EXT_SEC_CTX: 545 if (verify_sec_ctx_len(p)) 546 return -EINVAL; 547 break; 548 case SADB_EXT_KEY_AUTH: 549 case SADB_EXT_KEY_ENCRYPT: 550 if (verify_key_len(p)) 551 return -EINVAL; 552 break; 553 default: 554 break; 555 } 556 ext_hdrs[ext_type-1] = (void *) p; 557 } 558 p += ext_len; 559 len -= ext_len; 560 } 561 562 return 0; 563} 564 565static uint16_t 566pfkey_satype2proto(uint8_t satype) 567{ 568 switch (satype) { 569 case SADB_SATYPE_UNSPEC: 570 return IPSEC_PROTO_ANY; 571 case SADB_SATYPE_AH: 572 return IPPROTO_AH; 573 case SADB_SATYPE_ESP: 574 return IPPROTO_ESP; 575 case SADB_X_SATYPE_IPCOMP: 576 return IPPROTO_COMP; 577 default: 578 return 0; 579 } 580 /* NOTREACHED */ 581} 582 583static uint8_t 584pfkey_proto2satype(uint16_t proto) 585{ 586 switch (proto) { 587 case IPPROTO_AH: 588 return SADB_SATYPE_AH; 589 case IPPROTO_ESP: 590 return SADB_SATYPE_ESP; 591 case IPPROTO_COMP: 592 return SADB_X_SATYPE_IPCOMP; 593 default: 594 return 0; 595 } 596 /* NOTREACHED */ 597} 598 599/* BTW, this scheme means that there is no way with PFKEY2 sockets to 600 * say specifically 'just raw sockets' as we encode them as 255. 601 */ 602 603static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 604{ 605 return proto == IPSEC_PROTO_ANY ? 0 : proto; 606} 607 608static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 609{ 610 return proto ? proto : IPSEC_PROTO_ANY; 611} 612 613static inline int pfkey_sockaddr_len(sa_family_t family) 614{ 615 switch (family) { 616 case AF_INET: 617 return sizeof(struct sockaddr_in); 618#if IS_ENABLED(CONFIG_IPV6) 619 case AF_INET6: 620 return sizeof(struct sockaddr_in6); 621#endif 622 } 623 return 0; 624} 625 626static 627int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr) 628{ 629 switch (sa->sa_family) { 630 case AF_INET: 631 xaddr->a4 = 632 ((struct sockaddr_in *)sa)->sin_addr.s_addr; 633 return AF_INET; 634#if IS_ENABLED(CONFIG_IPV6) 635 case AF_INET6: 636 memcpy(xaddr->a6, 637 &((struct sockaddr_in6 *)sa)->sin6_addr, 638 sizeof(struct in6_addr)); 639 return AF_INET6; 640#endif 641 } 642 return 0; 643} 644 645static 646int pfkey_sadb_addr2xfrm_addr(const struct sadb_address *addr, xfrm_address_t *xaddr) 647{ 648 return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1), 649 xaddr); 650} 651 652static struct xfrm_state *pfkey_xfrm_state_lookup(struct net *net, const struct sadb_msg *hdr, void * const *ext_hdrs) 653{ 654 const struct sadb_sa *sa; 655 const struct sadb_address *addr; 656 uint16_t proto; 657 unsigned short family; 658 xfrm_address_t *xaddr; 659 660 sa = ext_hdrs[SADB_EXT_SA - 1]; 661 if (sa == NULL) 662 return NULL; 663 664 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 665 if (proto == 0) 666 return NULL; 667 668 /* sadb_address_len should be checked by caller */ 669 addr = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 670 if (addr == NULL) 671 return NULL; 672 673 family = ((const struct sockaddr *)(addr + 1))->sa_family; 674 switch (family) { 675 case AF_INET: 676 xaddr = (xfrm_address_t *)&((const struct sockaddr_in *)(addr + 1))->sin_addr; 677 break; 678#if IS_ENABLED(CONFIG_IPV6) 679 case AF_INET6: 680 xaddr = (xfrm_address_t *)&((const struct sockaddr_in6 *)(addr + 1))->sin6_addr; 681 break; 682#endif 683 default: 684 xaddr = NULL; 685 } 686 687 if (!xaddr) 688 return NULL; 689 690 return xfrm_state_lookup(net, DUMMY_MARK, xaddr, sa->sadb_sa_spi, proto, family); 691} 692 693#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 694 695static int 696pfkey_sockaddr_size(sa_family_t family) 697{ 698 return PFKEY_ALIGN8(pfkey_sockaddr_len(family)); 699} 700 701static inline int pfkey_mode_from_xfrm(int mode) 702{ 703 switch(mode) { 704 case XFRM_MODE_TRANSPORT: 705 return IPSEC_MODE_TRANSPORT; 706 case XFRM_MODE_TUNNEL: 707 return IPSEC_MODE_TUNNEL; 708 case XFRM_MODE_BEET: 709 return IPSEC_MODE_BEET; 710 default: 711 return -1; 712 } 713} 714 715static inline int pfkey_mode_to_xfrm(int mode) 716{ 717 switch(mode) { 718 case IPSEC_MODE_ANY: /*XXX*/ 719 case IPSEC_MODE_TRANSPORT: 720 return XFRM_MODE_TRANSPORT; 721 case IPSEC_MODE_TUNNEL: 722 return XFRM_MODE_TUNNEL; 723 case IPSEC_MODE_BEET: 724 return XFRM_MODE_BEET; 725 default: 726 return -1; 727 } 728} 729 730static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port, 731 struct sockaddr *sa, 732 unsigned short family) 733{ 734 switch (family) { 735 case AF_INET: 736 { 737 struct sockaddr_in *sin = (struct sockaddr_in *)sa; 738 sin->sin_family = AF_INET; 739 sin->sin_port = port; 740 sin->sin_addr.s_addr = xaddr->a4; 741 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 742 return 32; 743 } 744#if IS_ENABLED(CONFIG_IPV6) 745 case AF_INET6: 746 { 747 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 748 sin6->sin6_family = AF_INET6; 749 sin6->sin6_port = port; 750 sin6->sin6_flowinfo = 0; 751 sin6->sin6_addr = xaddr->in6; 752 sin6->sin6_scope_id = 0; 753 return 128; 754 } 755#endif 756 } 757 return 0; 758} 759 760static unsigned int pfkey_sockaddr_fill_zero_tail(const xfrm_address_t *xaddr, 761 __be16 port, 762 struct sockaddr *sa, 763 unsigned short family) 764{ 765 unsigned int prefixlen; 766 int sockaddr_len = pfkey_sockaddr_len(family); 767 int sockaddr_size = pfkey_sockaddr_size(family); 768 769 prefixlen = pfkey_sockaddr_fill(xaddr, port, sa, family); 770 if (sockaddr_size > sockaddr_len) 771 memset((u8 *)sa + sockaddr_len, 0, sockaddr_size - sockaddr_len); 772 773 return prefixlen; 774} 775 776static struct sk_buff *__pfkey_xfrm_state2msg(const struct xfrm_state *x, 777 int add_keys, int hsc) 778{ 779 struct sk_buff *skb; 780 struct sadb_msg *hdr; 781 struct sadb_sa *sa; 782 struct sadb_lifetime *lifetime; 783 struct sadb_address *addr; 784 struct sadb_key *key; 785 struct sadb_x_sa2 *sa2; 786 struct sadb_x_sec_ctx *sec_ctx; 787 struct xfrm_sec_ctx *xfrm_ctx; 788 int ctx_size = 0; 789 int size; 790 int auth_key_size = 0; 791 int encrypt_key_size = 0; 792 int sockaddr_size; 793 struct xfrm_encap_tmpl *natt = NULL; 794 int mode; 795 796 /* address family check */ 797 sockaddr_size = pfkey_sockaddr_size(x->props.family); 798 if (!sockaddr_size) 799 return ERR_PTR(-EINVAL); 800 801 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 802 key(AE), (identity(SD),) (sensitivity)> */ 803 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 804 sizeof(struct sadb_lifetime) + 805 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 806 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 807 sizeof(struct sadb_address)*2 + 808 sockaddr_size*2 + 809 sizeof(struct sadb_x_sa2); 810 811 if ((xfrm_ctx = x->security)) { 812 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 813 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 814 } 815 816 /* identity & sensitivity */ 817 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, x->props.family)) 818 size += sizeof(struct sadb_address) + sockaddr_size; 819 820 if (add_keys) { 821 if (x->aalg && x->aalg->alg_key_len) { 822 auth_key_size = 823 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 824 size += sizeof(struct sadb_key) + auth_key_size; 825 } 826 if (x->ealg && x->ealg->alg_key_len) { 827 encrypt_key_size = 828 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 829 size += sizeof(struct sadb_key) + encrypt_key_size; 830 } 831 } 832 if (x->encap) 833 natt = x->encap; 834 835 if (natt && natt->encap_type) { 836 size += sizeof(struct sadb_x_nat_t_type); 837 size += sizeof(struct sadb_x_nat_t_port); 838 size += sizeof(struct sadb_x_nat_t_port); 839 } 840 841 skb = alloc_skb(size + 16, GFP_ATOMIC); 842 if (skb == NULL) 843 return ERR_PTR(-ENOBUFS); 844 845 /* call should fill header later */ 846 hdr = skb_put(skb, sizeof(struct sadb_msg)); 847 memset(hdr, 0, size); /* XXX do we need this ? */ 848 hdr->sadb_msg_len = size / sizeof(uint64_t); 849 850 /* sa */ 851 sa = skb_put(skb, sizeof(struct sadb_sa)); 852 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 853 sa->sadb_sa_exttype = SADB_EXT_SA; 854 sa->sadb_sa_spi = x->id.spi; 855 sa->sadb_sa_replay = x->props.replay_window; 856 switch (x->km.state) { 857 case XFRM_STATE_VALID: 858 sa->sadb_sa_state = x->km.dying ? 859 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 860 break; 861 case XFRM_STATE_ACQ: 862 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 863 break; 864 default: 865 sa->sadb_sa_state = SADB_SASTATE_DEAD; 866 break; 867 } 868 sa->sadb_sa_auth = 0; 869 if (x->aalg) { 870 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 871 sa->sadb_sa_auth = (a && a->pfkey_supported) ? 872 a->desc.sadb_alg_id : 0; 873 } 874 sa->sadb_sa_encrypt = 0; 875 BUG_ON(x->ealg && x->calg); 876 if (x->ealg) { 877 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 878 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 879 a->desc.sadb_alg_id : 0; 880 } 881 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 882 if (x->calg) { 883 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 884 sa->sadb_sa_encrypt = (a && a->pfkey_supported) ? 885 a->desc.sadb_alg_id : 0; 886 } 887 888 sa->sadb_sa_flags = 0; 889 if (x->props.flags & XFRM_STATE_NOECN) 890 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 891 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 892 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 893 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 894 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 895 896 /* hard time */ 897 if (hsc & 2) { 898 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 899 lifetime->sadb_lifetime_len = 900 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 901 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 902 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 903 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 904 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 905 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 906 } 907 /* soft time */ 908 if (hsc & 1) { 909 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 910 lifetime->sadb_lifetime_len = 911 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 912 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 913 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 914 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 915 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 916 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 917 } 918 /* current time */ 919 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 920 lifetime->sadb_lifetime_len = 921 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 922 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 923 lifetime->sadb_lifetime_allocations = x->curlft.packets; 924 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 925 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 926 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 927 /* src address */ 928 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 929 addr->sadb_address_len = 930 (sizeof(struct sadb_address)+sockaddr_size)/ 931 sizeof(uint64_t); 932 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 933 /* "if the ports are non-zero, then the sadb_address_proto field, 934 normally zero, MUST be filled in with the transport 935 protocol's number." - RFC2367 */ 936 addr->sadb_address_proto = 0; 937 addr->sadb_address_reserved = 0; 938 939 addr->sadb_address_prefixlen = 940 pfkey_sockaddr_fill(&x->props.saddr, 0, 941 (struct sockaddr *) (addr + 1), 942 x->props.family); 943 BUG_ON(!addr->sadb_address_prefixlen); 944 945 /* dst address */ 946 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 947 addr->sadb_address_len = 948 (sizeof(struct sadb_address)+sockaddr_size)/ 949 sizeof(uint64_t); 950 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 951 addr->sadb_address_proto = 0; 952 addr->sadb_address_reserved = 0; 953 954 addr->sadb_address_prefixlen = 955 pfkey_sockaddr_fill(&x->id.daddr, 0, 956 (struct sockaddr *) (addr + 1), 957 x->props.family); 958 BUG_ON(!addr->sadb_address_prefixlen); 959 960 if (!xfrm_addr_equal(&x->sel.saddr, &x->props.saddr, 961 x->props.family)) { 962 addr = skb_put(skb, 963 sizeof(struct sadb_address) + sockaddr_size); 964 addr->sadb_address_len = 965 (sizeof(struct sadb_address)+sockaddr_size)/ 966 sizeof(uint64_t); 967 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 968 addr->sadb_address_proto = 969 pfkey_proto_from_xfrm(x->sel.proto); 970 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 971 addr->sadb_address_reserved = 0; 972 973 pfkey_sockaddr_fill(&x->sel.saddr, x->sel.sport, 974 (struct sockaddr *) (addr + 1), 975 x->props.family); 976 } 977 978 /* auth key */ 979 if (add_keys && auth_key_size) { 980 key = skb_put(skb, sizeof(struct sadb_key) + auth_key_size); 981 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 982 sizeof(uint64_t); 983 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 984 key->sadb_key_bits = x->aalg->alg_key_len; 985 key->sadb_key_reserved = 0; 986 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 987 } 988 /* encrypt key */ 989 if (add_keys && encrypt_key_size) { 990 key = skb_put(skb, sizeof(struct sadb_key) + encrypt_key_size); 991 key->sadb_key_len = (sizeof(struct sadb_key) + 992 encrypt_key_size) / sizeof(uint64_t); 993 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 994 key->sadb_key_bits = x->ealg->alg_key_len; 995 key->sadb_key_reserved = 0; 996 memcpy(key + 1, x->ealg->alg_key, 997 (x->ealg->alg_key_len+7)/8); 998 } 999 1000 /* sa */ 1001 sa2 = skb_put(skb, sizeof(struct sadb_x_sa2)); 1002 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 1003 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 1004 if ((mode = pfkey_mode_from_xfrm(x->props.mode)) < 0) { 1005 kfree_skb(skb); 1006 return ERR_PTR(-EINVAL); 1007 } 1008 sa2->sadb_x_sa2_mode = mode; 1009 sa2->sadb_x_sa2_reserved1 = 0; 1010 sa2->sadb_x_sa2_reserved2 = 0; 1011 sa2->sadb_x_sa2_sequence = 0; 1012 sa2->sadb_x_sa2_reqid = x->props.reqid; 1013 1014 if (natt && natt->encap_type) { 1015 struct sadb_x_nat_t_type *n_type; 1016 struct sadb_x_nat_t_port *n_port; 1017 1018 /* type */ 1019 n_type = skb_put(skb, sizeof(*n_type)); 1020 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 1021 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 1022 n_type->sadb_x_nat_t_type_type = natt->encap_type; 1023 n_type->sadb_x_nat_t_type_reserved[0] = 0; 1024 n_type->sadb_x_nat_t_type_reserved[1] = 0; 1025 n_type->sadb_x_nat_t_type_reserved[2] = 0; 1026 1027 /* source port */ 1028 n_port = skb_put(skb, sizeof(*n_port)); 1029 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1030 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 1031 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 1032 n_port->sadb_x_nat_t_port_reserved = 0; 1033 1034 /* dest port */ 1035 n_port = skb_put(skb, sizeof(*n_port)); 1036 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 1037 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 1038 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 1039 n_port->sadb_x_nat_t_port_reserved = 0; 1040 } 1041 1042 /* security context */ 1043 if (xfrm_ctx) { 1044 sec_ctx = skb_put(skb, 1045 sizeof(struct sadb_x_sec_ctx) + ctx_size); 1046 sec_ctx->sadb_x_sec_len = 1047 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 1048 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 1049 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 1050 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 1051 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 1052 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 1053 xfrm_ctx->ctx_len); 1054 } 1055 1056 return skb; 1057} 1058 1059 1060static inline struct sk_buff *pfkey_xfrm_state2msg(const struct xfrm_state *x) 1061{ 1062 struct sk_buff *skb; 1063 1064 skb = __pfkey_xfrm_state2msg(x, 1, 3); 1065 1066 return skb; 1067} 1068 1069static inline struct sk_buff *pfkey_xfrm_state2msg_expire(const struct xfrm_state *x, 1070 int hsc) 1071{ 1072 return __pfkey_xfrm_state2msg(x, 0, hsc); 1073} 1074 1075static struct xfrm_state * pfkey_msg2xfrm_state(struct net *net, 1076 const struct sadb_msg *hdr, 1077 void * const *ext_hdrs) 1078{ 1079 struct xfrm_state *x; 1080 const struct sadb_lifetime *lifetime; 1081 const struct sadb_sa *sa; 1082 const struct sadb_key *key; 1083 const struct sadb_x_sec_ctx *sec_ctx; 1084 uint16_t proto; 1085 int err; 1086 1087 1088 sa = ext_hdrs[SADB_EXT_SA - 1]; 1089 if (!sa || 1090 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1091 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1092 return ERR_PTR(-EINVAL); 1093 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1094 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1095 return ERR_PTR(-EINVAL); 1096 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1097 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1098 return ERR_PTR(-EINVAL); 1099 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1100 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1101 return ERR_PTR(-EINVAL); 1102 1103 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1104 if (proto == 0) 1105 return ERR_PTR(-EINVAL); 1106 1107 /* default error is no buffer space */ 1108 err = -ENOBUFS; 1109 1110 /* RFC2367: 1111 1112 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1113 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1114 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1115 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1116 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1117 not true. 1118 1119 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1120 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1121 */ 1122 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1123 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1124 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1125 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1126 return ERR_PTR(-EINVAL); 1127 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1128 if (key != NULL && 1129 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1130 key->sadb_key_bits == 0) 1131 return ERR_PTR(-EINVAL); 1132 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1133 if (key != NULL && 1134 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1135 key->sadb_key_bits == 0) 1136 return ERR_PTR(-EINVAL); 1137 1138 x = xfrm_state_alloc(net); 1139 if (x == NULL) 1140 return ERR_PTR(-ENOBUFS); 1141 1142 x->id.proto = proto; 1143 x->id.spi = sa->sadb_sa_spi; 1144 x->props.replay_window = min_t(unsigned int, sa->sadb_sa_replay, 1145 (sizeof(x->replay.bitmap) * 8)); 1146 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1147 x->props.flags |= XFRM_STATE_NOECN; 1148 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1149 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1150 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1151 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1152 1153 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1154 if (lifetime != NULL) { 1155 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1156 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1157 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1158 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1159 } 1160 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1161 if (lifetime != NULL) { 1162 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1163 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1164 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1165 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1166 } 1167 1168 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1169 if (sec_ctx != NULL) { 1170 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 1171 1172 if (!uctx) 1173 goto out; 1174 1175 err = security_xfrm_state_alloc(x, uctx); 1176 kfree(uctx); 1177 1178 if (err) 1179 goto out; 1180 } 1181 1182 err = -ENOBUFS; 1183 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1184 if (sa->sadb_sa_auth) { 1185 int keysize = 0; 1186 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1187 if (!a || !a->pfkey_supported) { 1188 err = -ENOSYS; 1189 goto out; 1190 } 1191 if (key) 1192 keysize = (key->sadb_key_bits + 7) / 8; 1193 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1194 if (!x->aalg) { 1195 err = -ENOMEM; 1196 goto out; 1197 } 1198 strcpy(x->aalg->alg_name, a->name); 1199 x->aalg->alg_key_len = 0; 1200 if (key) { 1201 x->aalg->alg_key_len = key->sadb_key_bits; 1202 memcpy(x->aalg->alg_key, key+1, keysize); 1203 } 1204 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1205 x->props.aalgo = sa->sadb_sa_auth; 1206 /* x->algo.flags = sa->sadb_sa_flags; */ 1207 } 1208 if (sa->sadb_sa_encrypt) { 1209 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1210 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1211 if (!a || !a->pfkey_supported) { 1212 err = -ENOSYS; 1213 goto out; 1214 } 1215 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1216 if (!x->calg) { 1217 err = -ENOMEM; 1218 goto out; 1219 } 1220 strcpy(x->calg->alg_name, a->name); 1221 x->props.calgo = sa->sadb_sa_encrypt; 1222 } else { 1223 int keysize = 0; 1224 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1225 if (!a || !a->pfkey_supported) { 1226 err = -ENOSYS; 1227 goto out; 1228 } 1229 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1230 if (key) 1231 keysize = (key->sadb_key_bits + 7) / 8; 1232 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1233 if (!x->ealg) { 1234 err = -ENOMEM; 1235 goto out; 1236 } 1237 strcpy(x->ealg->alg_name, a->name); 1238 x->ealg->alg_key_len = 0; 1239 if (key) { 1240 x->ealg->alg_key_len = key->sadb_key_bits; 1241 memcpy(x->ealg->alg_key, key+1, keysize); 1242 } 1243 x->props.ealgo = sa->sadb_sa_encrypt; 1244 x->geniv = a->uinfo.encr.geniv; 1245 } 1246 } 1247 /* x->algo.flags = sa->sadb_sa_flags; */ 1248 1249 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1250 &x->props.saddr); 1251 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1252 &x->id.daddr); 1253 1254 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1255 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1256 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1257 if (mode < 0) { 1258 err = -EINVAL; 1259 goto out; 1260 } 1261 x->props.mode = mode; 1262 x->props.reqid = sa2->sadb_x_sa2_reqid; 1263 } 1264 1265 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1266 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1267 1268 /* Nobody uses this, but we try. */ 1269 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1270 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1271 } 1272 1273 if (!x->sel.family) 1274 x->sel.family = x->props.family; 1275 1276 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1277 const struct sadb_x_nat_t_type* n_type; 1278 struct xfrm_encap_tmpl *natt; 1279 1280 x->encap = kzalloc(sizeof(*x->encap), GFP_KERNEL); 1281 if (!x->encap) { 1282 err = -ENOMEM; 1283 goto out; 1284 } 1285 1286 natt = x->encap; 1287 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1288 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1289 1290 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1291 const struct sadb_x_nat_t_port *n_port = 1292 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1293 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1294 } 1295 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1296 const struct sadb_x_nat_t_port *n_port = 1297 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1298 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1299 } 1300 } 1301 1302 err = xfrm_init_state(x); 1303 if (err) 1304 goto out; 1305 1306 x->km.seq = hdr->sadb_msg_seq; 1307 return x; 1308 1309out: 1310 x->km.state = XFRM_STATE_DEAD; 1311 xfrm_state_put(x); 1312 return ERR_PTR(err); 1313} 1314 1315static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1316{ 1317 return -EOPNOTSUPP; 1318} 1319 1320static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1321{ 1322 struct net *net = sock_net(sk); 1323 struct sk_buff *resp_skb; 1324 struct sadb_x_sa2 *sa2; 1325 struct sadb_address *saddr, *daddr; 1326 struct sadb_msg *out_hdr; 1327 struct sadb_spirange *range; 1328 struct xfrm_state *x = NULL; 1329 int mode; 1330 int err; 1331 u32 min_spi, max_spi; 1332 u32 reqid; 1333 u8 proto; 1334 unsigned short family; 1335 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1336 1337 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1338 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1339 return -EINVAL; 1340 1341 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1342 if (proto == 0) 1343 return -EINVAL; 1344 1345 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1346 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1347 if (mode < 0) 1348 return -EINVAL; 1349 reqid = sa2->sadb_x_sa2_reqid; 1350 } else { 1351 mode = 0; 1352 reqid = 0; 1353 } 1354 1355 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1356 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1357 1358 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1359 switch (family) { 1360 case AF_INET: 1361 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1362 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1363 break; 1364#if IS_ENABLED(CONFIG_IPV6) 1365 case AF_INET6: 1366 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1367 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1368 break; 1369#endif 1370 } 1371 1372 if (hdr->sadb_msg_seq) { 1373 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX); 1374 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1375 xfrm_state_put(x); 1376 x = NULL; 1377 } 1378 } 1379 1380 if (!x) 1381 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, 0, UINT_MAX, 1382 proto, xdaddr, xsaddr, 1, family); 1383 1384 if (x == NULL) 1385 return -ENOENT; 1386 1387 min_spi = 0x100; 1388 max_spi = 0x0fffffff; 1389 1390 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1391 if (range) { 1392 min_spi = range->sadb_spirange_min; 1393 max_spi = range->sadb_spirange_max; 1394 } 1395 1396 err = verify_spi_info(x->id.proto, min_spi, max_spi, NULL); 1397 if (err) { 1398 xfrm_state_put(x); 1399 return err; 1400 } 1401 1402 err = xfrm_alloc_spi(x, min_spi, max_spi, NULL); 1403 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1404 1405 if (IS_ERR(resp_skb)) { 1406 xfrm_state_put(x); 1407 return PTR_ERR(resp_skb); 1408 } 1409 1410 out_hdr = (struct sadb_msg *) resp_skb->data; 1411 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1412 out_hdr->sadb_msg_type = SADB_GETSPI; 1413 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1414 out_hdr->sadb_msg_errno = 0; 1415 out_hdr->sadb_msg_reserved = 0; 1416 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1417 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1418 1419 xfrm_state_put(x); 1420 1421 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1422 1423 return 0; 1424} 1425 1426static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1427{ 1428 struct net *net = sock_net(sk); 1429 struct xfrm_state *x; 1430 1431 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1432 return -EOPNOTSUPP; 1433 1434 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1435 return 0; 1436 1437 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq, UINT_MAX); 1438 if (x == NULL) 1439 return 0; 1440 1441 spin_lock_bh(&x->lock); 1442 if (x->km.state == XFRM_STATE_ACQ) 1443 x->km.state = XFRM_STATE_ERROR; 1444 1445 spin_unlock_bh(&x->lock); 1446 xfrm_state_put(x); 1447 return 0; 1448} 1449 1450static inline int event2poltype(int event) 1451{ 1452 switch (event) { 1453 case XFRM_MSG_DELPOLICY: 1454 return SADB_X_SPDDELETE; 1455 case XFRM_MSG_NEWPOLICY: 1456 return SADB_X_SPDADD; 1457 case XFRM_MSG_UPDPOLICY: 1458 return SADB_X_SPDUPDATE; 1459 case XFRM_MSG_POLEXPIRE: 1460 // return SADB_X_SPDEXPIRE; 1461 default: 1462 pr_err("pfkey: Unknown policy event %d\n", event); 1463 break; 1464 } 1465 1466 return 0; 1467} 1468 1469static inline int event2keytype(int event) 1470{ 1471 switch (event) { 1472 case XFRM_MSG_DELSA: 1473 return SADB_DELETE; 1474 case XFRM_MSG_NEWSA: 1475 return SADB_ADD; 1476 case XFRM_MSG_UPDSA: 1477 return SADB_UPDATE; 1478 case XFRM_MSG_EXPIRE: 1479 return SADB_EXPIRE; 1480 default: 1481 pr_err("pfkey: Unknown SA event %d\n", event); 1482 break; 1483 } 1484 1485 return 0; 1486} 1487 1488/* ADD/UPD/DEL */ 1489static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1490{ 1491 struct sk_buff *skb; 1492 struct sadb_msg *hdr; 1493 1494 skb = pfkey_xfrm_state2msg(x); 1495 1496 if (IS_ERR(skb)) 1497 return PTR_ERR(skb); 1498 1499 hdr = (struct sadb_msg *) skb->data; 1500 hdr->sadb_msg_version = PF_KEY_V2; 1501 hdr->sadb_msg_type = event2keytype(c->event); 1502 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1503 hdr->sadb_msg_errno = 0; 1504 hdr->sadb_msg_reserved = 0; 1505 hdr->sadb_msg_seq = c->seq; 1506 hdr->sadb_msg_pid = c->portid; 1507 1508 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1509 1510 return 0; 1511} 1512 1513static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1514{ 1515 struct net *net = sock_net(sk); 1516 struct xfrm_state *x; 1517 int err; 1518 struct km_event c; 1519 1520 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1521 if (IS_ERR(x)) 1522 return PTR_ERR(x); 1523 1524 xfrm_state_hold(x); 1525 if (hdr->sadb_msg_type == SADB_ADD) 1526 err = xfrm_state_add(x); 1527 else 1528 err = xfrm_state_update(x); 1529 1530 xfrm_audit_state_add(x, err ? 0 : 1, true); 1531 1532 if (err < 0) { 1533 x->km.state = XFRM_STATE_DEAD; 1534 __xfrm_state_put(x); 1535 goto out; 1536 } 1537 1538 if (hdr->sadb_msg_type == SADB_ADD) 1539 c.event = XFRM_MSG_NEWSA; 1540 else 1541 c.event = XFRM_MSG_UPDSA; 1542 c.seq = hdr->sadb_msg_seq; 1543 c.portid = hdr->sadb_msg_pid; 1544 km_state_notify(x, &c); 1545out: 1546 xfrm_state_put(x); 1547 return err; 1548} 1549 1550static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1551{ 1552 struct net *net = sock_net(sk); 1553 struct xfrm_state *x; 1554 struct km_event c; 1555 int err; 1556 1557 if (!ext_hdrs[SADB_EXT_SA-1] || 1558 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1559 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1560 return -EINVAL; 1561 1562 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1563 if (x == NULL) 1564 return -ESRCH; 1565 1566 if ((err = security_xfrm_state_delete(x))) 1567 goto out; 1568 1569 if (xfrm_state_kern(x)) { 1570 err = -EPERM; 1571 goto out; 1572 } 1573 1574 err = xfrm_state_delete(x); 1575 1576 if (err < 0) 1577 goto out; 1578 1579 c.seq = hdr->sadb_msg_seq; 1580 c.portid = hdr->sadb_msg_pid; 1581 c.event = XFRM_MSG_DELSA; 1582 km_state_notify(x, &c); 1583out: 1584 xfrm_audit_state_delete(x, err ? 0 : 1, true); 1585 xfrm_state_put(x); 1586 1587 return err; 1588} 1589 1590static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1591{ 1592 struct net *net = sock_net(sk); 1593 __u8 proto; 1594 struct sk_buff *out_skb; 1595 struct sadb_msg *out_hdr; 1596 struct xfrm_state *x; 1597 1598 if (!ext_hdrs[SADB_EXT_SA-1] || 1599 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1600 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1601 return -EINVAL; 1602 1603 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1604 if (x == NULL) 1605 return -ESRCH; 1606 1607 out_skb = pfkey_xfrm_state2msg(x); 1608 proto = x->id.proto; 1609 xfrm_state_put(x); 1610 if (IS_ERR(out_skb)) 1611 return PTR_ERR(out_skb); 1612 1613 out_hdr = (struct sadb_msg *) out_skb->data; 1614 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1615 out_hdr->sadb_msg_type = SADB_GET; 1616 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1617 out_hdr->sadb_msg_errno = 0; 1618 out_hdr->sadb_msg_reserved = 0; 1619 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1620 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1621 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1622 1623 return 0; 1624} 1625 1626static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1627 gfp_t allocation) 1628{ 1629 struct sk_buff *skb; 1630 struct sadb_msg *hdr; 1631 int len, auth_len, enc_len, i; 1632 1633 auth_len = xfrm_count_pfkey_auth_supported(); 1634 if (auth_len) { 1635 auth_len *= sizeof(struct sadb_alg); 1636 auth_len += sizeof(struct sadb_supported); 1637 } 1638 1639 enc_len = xfrm_count_pfkey_enc_supported(); 1640 if (enc_len) { 1641 enc_len *= sizeof(struct sadb_alg); 1642 enc_len += sizeof(struct sadb_supported); 1643 } 1644 1645 len = enc_len + auth_len + sizeof(struct sadb_msg); 1646 1647 skb = alloc_skb(len + 16, allocation); 1648 if (!skb) 1649 goto out_put_algs; 1650 1651 hdr = skb_put(skb, sizeof(*hdr)); 1652 pfkey_hdr_dup(hdr, orig); 1653 hdr->sadb_msg_errno = 0; 1654 hdr->sadb_msg_len = len / sizeof(uint64_t); 1655 1656 if (auth_len) { 1657 struct sadb_supported *sp; 1658 struct sadb_alg *ap; 1659 1660 sp = skb_put(skb, auth_len); 1661 ap = (struct sadb_alg *) (sp + 1); 1662 1663 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1664 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1665 1666 for (i = 0; ; i++) { 1667 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1668 if (!aalg) 1669 break; 1670 if (!aalg->pfkey_supported) 1671 continue; 1672 if (aalg->available) 1673 *ap++ = aalg->desc; 1674 } 1675 } 1676 1677 if (enc_len) { 1678 struct sadb_supported *sp; 1679 struct sadb_alg *ap; 1680 1681 sp = skb_put(skb, enc_len); 1682 ap = (struct sadb_alg *) (sp + 1); 1683 1684 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1685 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1686 1687 for (i = 0; ; i++) { 1688 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1689 if (!ealg) 1690 break; 1691 if (!ealg->pfkey_supported) 1692 continue; 1693 if (ealg->available) 1694 *ap++ = ealg->desc; 1695 } 1696 } 1697 1698out_put_algs: 1699 return skb; 1700} 1701 1702static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1703{ 1704 struct pfkey_sock *pfk = pfkey_sk(sk); 1705 struct sk_buff *supp_skb; 1706 1707 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1708 return -EINVAL; 1709 1710 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1711 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1712 return -EEXIST; 1713 pfk->registered |= (1<<hdr->sadb_msg_satype); 1714 } 1715 1716 mutex_lock(&pfkey_mutex); 1717 xfrm_probe_algs(); 1718 1719 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); 1720 mutex_unlock(&pfkey_mutex); 1721 1722 if (!supp_skb) { 1723 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1724 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1725 1726 return -ENOBUFS; 1727 } 1728 1729 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, 1730 sock_net(sk)); 1731 return 0; 1732} 1733 1734static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1735{ 1736 struct sk_buff *skb; 1737 struct sadb_msg *hdr; 1738 1739 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1740 if (!skb) 1741 return -ENOBUFS; 1742 1743 hdr = skb_put_data(skb, ihdr, sizeof(struct sadb_msg)); 1744 hdr->sadb_msg_errno = (uint8_t) 0; 1745 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1746 1747 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, 1748 sock_net(sk)); 1749} 1750 1751static int key_notify_sa_flush(const struct km_event *c) 1752{ 1753 struct sk_buff *skb; 1754 struct sadb_msg *hdr; 1755 1756 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1757 if (!skb) 1758 return -ENOBUFS; 1759 hdr = skb_put(skb, sizeof(struct sadb_msg)); 1760 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1761 hdr->sadb_msg_type = SADB_FLUSH; 1762 hdr->sadb_msg_seq = c->seq; 1763 hdr->sadb_msg_pid = c->portid; 1764 hdr->sadb_msg_version = PF_KEY_V2; 1765 hdr->sadb_msg_errno = (uint8_t) 0; 1766 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1767 hdr->sadb_msg_reserved = 0; 1768 1769 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1770 1771 return 0; 1772} 1773 1774static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1775{ 1776 struct net *net = sock_net(sk); 1777 unsigned int proto; 1778 struct km_event c; 1779 int err, err2; 1780 1781 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1782 if (proto == 0) 1783 return -EINVAL; 1784 1785 err = xfrm_state_flush(net, proto, true); 1786 err2 = unicast_flush_resp(sk, hdr); 1787 if (err || err2) { 1788 if (err == -ESRCH) /* empty table - go quietly */ 1789 err = 0; 1790 return err ? err : err2; 1791 } 1792 1793 c.data.proto = proto; 1794 c.seq = hdr->sadb_msg_seq; 1795 c.portid = hdr->sadb_msg_pid; 1796 c.event = XFRM_MSG_FLUSHSA; 1797 c.net = net; 1798 km_state_notify(NULL, &c); 1799 1800 return 0; 1801} 1802 1803static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1804{ 1805 struct pfkey_sock *pfk = ptr; 1806 struct sk_buff *out_skb; 1807 struct sadb_msg *out_hdr; 1808 1809 if (!pfkey_can_dump(&pfk->sk)) 1810 return -ENOBUFS; 1811 1812 out_skb = pfkey_xfrm_state2msg(x); 1813 if (IS_ERR(out_skb)) 1814 return PTR_ERR(out_skb); 1815 1816 out_hdr = (struct sadb_msg *) out_skb->data; 1817 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1818 out_hdr->sadb_msg_type = SADB_DUMP; 1819 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1820 out_hdr->sadb_msg_errno = 0; 1821 out_hdr->sadb_msg_reserved = 0; 1822 out_hdr->sadb_msg_seq = count + 1; 1823 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1824 1825 if (pfk->dump.skb) 1826 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1827 &pfk->sk, sock_net(&pfk->sk)); 1828 pfk->dump.skb = out_skb; 1829 1830 return 0; 1831} 1832 1833static int pfkey_dump_sa(struct pfkey_sock *pfk) 1834{ 1835 struct net *net = sock_net(&pfk->sk); 1836 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1837} 1838 1839static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1840{ 1841 struct net *net = sock_net(&pfk->sk); 1842 1843 xfrm_state_walk_done(&pfk->dump.u.state, net); 1844} 1845 1846static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1847{ 1848 u8 proto; 1849 struct xfrm_address_filter *filter = NULL; 1850 struct pfkey_sock *pfk = pfkey_sk(sk); 1851 1852 mutex_lock(&pfk->dump_lock); 1853 if (pfk->dump.dump != NULL) { 1854 mutex_unlock(&pfk->dump_lock); 1855 return -EBUSY; 1856 } 1857 1858 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1859 if (proto == 0) { 1860 mutex_unlock(&pfk->dump_lock); 1861 return -EINVAL; 1862 } 1863 1864 if (ext_hdrs[SADB_X_EXT_FILTER - 1]) { 1865 struct sadb_x_filter *xfilter = ext_hdrs[SADB_X_EXT_FILTER - 1]; 1866 1867 if ((xfilter->sadb_x_filter_splen > 1868 (sizeof(xfrm_address_t) << 3)) || 1869 (xfilter->sadb_x_filter_dplen > 1870 (sizeof(xfrm_address_t) << 3))) { 1871 mutex_unlock(&pfk->dump_lock); 1872 return -EINVAL; 1873 } 1874 filter = kmalloc(sizeof(*filter), GFP_KERNEL); 1875 if (filter == NULL) { 1876 mutex_unlock(&pfk->dump_lock); 1877 return -ENOMEM; 1878 } 1879 1880 memcpy(&filter->saddr, &xfilter->sadb_x_filter_saddr, 1881 sizeof(xfrm_address_t)); 1882 memcpy(&filter->daddr, &xfilter->sadb_x_filter_daddr, 1883 sizeof(xfrm_address_t)); 1884 filter->family = xfilter->sadb_x_filter_family; 1885 filter->splen = xfilter->sadb_x_filter_splen; 1886 filter->dplen = xfilter->sadb_x_filter_dplen; 1887 } 1888 1889 pfk->dump.msg_version = hdr->sadb_msg_version; 1890 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1891 pfk->dump.dump = pfkey_dump_sa; 1892 pfk->dump.done = pfkey_dump_sa_done; 1893 xfrm_state_walk_init(&pfk->dump.u.state, proto, filter); 1894 mutex_unlock(&pfk->dump_lock); 1895 1896 return pfkey_do_dump(pfk); 1897} 1898 1899static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1900{ 1901 struct pfkey_sock *pfk = pfkey_sk(sk); 1902 int satype = hdr->sadb_msg_satype; 1903 bool reset_errno = false; 1904 1905 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1906 reset_errno = true; 1907 if (satype != 0 && satype != 1) 1908 return -EINVAL; 1909 pfk->promisc = satype; 1910 } 1911 if (reset_errno && skb_cloned(skb)) 1912 skb = skb_copy(skb, GFP_KERNEL); 1913 else 1914 skb = skb_clone(skb, GFP_KERNEL); 1915 1916 if (reset_errno && skb) { 1917 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1918 new_hdr->sadb_msg_errno = 0; 1919 } 1920 1921 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1922 return 0; 1923} 1924 1925static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1926{ 1927 int i; 1928 u32 reqid = *(u32*)ptr; 1929 1930 for (i=0; i<xp->xfrm_nr; i++) { 1931 if (xp->xfrm_vec[i].reqid == reqid) 1932 return -EEXIST; 1933 } 1934 return 0; 1935} 1936 1937static u32 gen_reqid(struct net *net) 1938{ 1939 struct xfrm_policy_walk walk; 1940 u32 start; 1941 int rc; 1942 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1943 1944 start = reqid; 1945 do { 1946 ++reqid; 1947 if (reqid == 0) 1948 reqid = IPSEC_MANUAL_REQID_MAX+1; 1949 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1950 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1951 xfrm_policy_walk_done(&walk, net); 1952 if (rc != -EEXIST) 1953 return reqid; 1954 } while (reqid != start); 1955 return 0; 1956} 1957 1958static int 1959parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_policy *pol, 1960 struct sadb_x_ipsecrequest *rq) 1961{ 1962 struct net *net = xp_net(xp); 1963 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1964 int mode; 1965 1966 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1967 return -ELOOP; 1968 1969 if (rq->sadb_x_ipsecrequest_mode == 0) 1970 return -EINVAL; 1971 if (!xfrm_id_proto_valid(rq->sadb_x_ipsecrequest_proto)) 1972 return -EINVAL; 1973 1974 t->id.proto = rq->sadb_x_ipsecrequest_proto; 1975 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1976 return -EINVAL; 1977 t->mode = mode; 1978 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) { 1979 if ((mode == XFRM_MODE_TUNNEL || mode == XFRM_MODE_BEET) && 1980 pol->sadb_x_policy_dir == IPSEC_DIR_OUTBOUND) 1981 return -EINVAL; 1982 t->optional = 1; 1983 } else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1984 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1985 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1986 t->reqid = 0; 1987 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1988 return -ENOBUFS; 1989 } 1990 1991 /* addresses present only in tunnel mode */ 1992 if (t->mode == XFRM_MODE_TUNNEL) { 1993 int err; 1994 1995 err = parse_sockaddr_pair( 1996 (struct sockaddr *)(rq + 1), 1997 rq->sadb_x_ipsecrequest_len - sizeof(*rq), 1998 &t->saddr, &t->id.daddr, &t->encap_family); 1999 if (err) 2000 return err; 2001 } else 2002 t->encap_family = xp->family; 2003 2004 /* No way to set this via kame pfkey */ 2005 t->allalgs = 1; 2006 xp->xfrm_nr++; 2007 return 0; 2008} 2009 2010static int 2011parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 2012{ 2013 int err; 2014 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 2015 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 2016 2017 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 2018 return -EINVAL; 2019 2020 while (len >= sizeof(*rq)) { 2021 if (len < rq->sadb_x_ipsecrequest_len || 2022 rq->sadb_x_ipsecrequest_len < sizeof(*rq)) 2023 return -EINVAL; 2024 2025 if ((err = parse_ipsecrequest(xp, pol, rq)) < 0) 2026 return err; 2027 len -= rq->sadb_x_ipsecrequest_len; 2028 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 2029 } 2030 return 0; 2031} 2032 2033static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 2034{ 2035 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 2036 2037 if (xfrm_ctx) { 2038 int len = sizeof(struct sadb_x_sec_ctx); 2039 len += xfrm_ctx->ctx_len; 2040 return PFKEY_ALIGN8(len); 2041 } 2042 return 0; 2043} 2044 2045static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 2046{ 2047 const struct xfrm_tmpl *t; 2048 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2049 int socklen = 0; 2050 int i; 2051 2052 for (i=0; i<xp->xfrm_nr; i++) { 2053 t = xp->xfrm_vec + i; 2054 socklen += pfkey_sockaddr_len(t->encap_family); 2055 } 2056 2057 return sizeof(struct sadb_msg) + 2058 (sizeof(struct sadb_lifetime) * 3) + 2059 (sizeof(struct sadb_address) * 2) + 2060 (sockaddr_size * 2) + 2061 sizeof(struct sadb_x_policy) + 2062 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 2063 (socklen * 2) + 2064 pfkey_xfrm_policy2sec_ctx_size(xp); 2065} 2066 2067static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 2068{ 2069 struct sk_buff *skb; 2070 int size; 2071 2072 size = pfkey_xfrm_policy2msg_size(xp); 2073 2074 skb = alloc_skb(size + 16, GFP_ATOMIC); 2075 if (skb == NULL) 2076 return ERR_PTR(-ENOBUFS); 2077 2078 return skb; 2079} 2080 2081static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 2082{ 2083 struct sadb_msg *hdr; 2084 struct sadb_address *addr; 2085 struct sadb_lifetime *lifetime; 2086 struct sadb_x_policy *pol; 2087 struct sadb_x_sec_ctx *sec_ctx; 2088 struct xfrm_sec_ctx *xfrm_ctx; 2089 int i; 2090 int size; 2091 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2092 int socklen = pfkey_sockaddr_len(xp->family); 2093 2094 size = pfkey_xfrm_policy2msg_size(xp); 2095 2096 /* call should fill header later */ 2097 hdr = skb_put(skb, sizeof(struct sadb_msg)); 2098 memset(hdr, 0, size); /* XXX do we need this ? */ 2099 2100 /* src address */ 2101 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2102 addr->sadb_address_len = 2103 (sizeof(struct sadb_address)+sockaddr_size)/ 2104 sizeof(uint64_t); 2105 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2106 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2107 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2108 addr->sadb_address_reserved = 0; 2109 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2110 xp->selector.sport, 2111 (struct sockaddr *) (addr + 1), 2112 xp->family)) 2113 BUG(); 2114 2115 /* dst address */ 2116 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 2117 addr->sadb_address_len = 2118 (sizeof(struct sadb_address)+sockaddr_size)/ 2119 sizeof(uint64_t); 2120 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2121 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2122 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2123 addr->sadb_address_reserved = 0; 2124 2125 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2126 (struct sockaddr *) (addr + 1), 2127 xp->family); 2128 2129 /* hard time */ 2130 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2131 lifetime->sadb_lifetime_len = 2132 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2133 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2134 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2135 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2136 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2137 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2138 /* soft time */ 2139 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2140 lifetime->sadb_lifetime_len = 2141 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2142 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2143 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2144 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2145 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2146 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2147 /* current time */ 2148 lifetime = skb_put(skb, sizeof(struct sadb_lifetime)); 2149 lifetime->sadb_lifetime_len = 2150 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2151 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2152 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2153 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2154 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2155 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2156 2157 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 2158 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2159 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2160 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2161 if (xp->action == XFRM_POLICY_ALLOW) { 2162 if (xp->xfrm_nr) 2163 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2164 else 2165 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2166 } 2167 pol->sadb_x_policy_dir = dir+1; 2168 pol->sadb_x_policy_reserved = 0; 2169 pol->sadb_x_policy_id = xp->index; 2170 pol->sadb_x_policy_priority = xp->priority; 2171 2172 for (i=0; i<xp->xfrm_nr; i++) { 2173 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2174 struct sadb_x_ipsecrequest *rq; 2175 int req_size; 2176 int mode; 2177 2178 req_size = sizeof(struct sadb_x_ipsecrequest); 2179 if (t->mode == XFRM_MODE_TUNNEL) { 2180 socklen = pfkey_sockaddr_len(t->encap_family); 2181 req_size += socklen * 2; 2182 } else { 2183 size -= 2*socklen; 2184 } 2185 rq = skb_put(skb, req_size); 2186 pol->sadb_x_policy_len += req_size/8; 2187 memset(rq, 0, sizeof(*rq)); 2188 rq->sadb_x_ipsecrequest_len = req_size; 2189 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2190 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2191 return -EINVAL; 2192 rq->sadb_x_ipsecrequest_mode = mode; 2193 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2194 if (t->reqid) 2195 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2196 if (t->optional) 2197 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2198 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2199 2200 if (t->mode == XFRM_MODE_TUNNEL) { 2201 u8 *sa = (void *)(rq + 1); 2202 pfkey_sockaddr_fill(&t->saddr, 0, 2203 (struct sockaddr *)sa, 2204 t->encap_family); 2205 pfkey_sockaddr_fill(&t->id.daddr, 0, 2206 (struct sockaddr *) (sa + socklen), 2207 t->encap_family); 2208 } 2209 } 2210 2211 /* security context */ 2212 if ((xfrm_ctx = xp->security)) { 2213 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2214 2215 sec_ctx = skb_put(skb, ctx_size); 2216 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2217 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2218 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2219 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2220 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2221 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2222 xfrm_ctx->ctx_len); 2223 } 2224 2225 hdr->sadb_msg_len = size / sizeof(uint64_t); 2226 hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); 2227 2228 return 0; 2229} 2230 2231static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2232{ 2233 struct sk_buff *out_skb; 2234 struct sadb_msg *out_hdr; 2235 int err; 2236 2237 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2238 if (IS_ERR(out_skb)) 2239 return PTR_ERR(out_skb); 2240 2241 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2242 if (err < 0) { 2243 kfree_skb(out_skb); 2244 return err; 2245 } 2246 2247 out_hdr = (struct sadb_msg *) out_skb->data; 2248 out_hdr->sadb_msg_version = PF_KEY_V2; 2249 2250 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2251 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2252 else 2253 out_hdr->sadb_msg_type = event2poltype(c->event); 2254 out_hdr->sadb_msg_errno = 0; 2255 out_hdr->sadb_msg_seq = c->seq; 2256 out_hdr->sadb_msg_pid = c->portid; 2257 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2258 return 0; 2259 2260} 2261 2262static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2263{ 2264 struct net *net = sock_net(sk); 2265 int err = 0; 2266 struct sadb_lifetime *lifetime; 2267 struct sadb_address *sa; 2268 struct sadb_x_policy *pol; 2269 struct xfrm_policy *xp; 2270 struct km_event c; 2271 struct sadb_x_sec_ctx *sec_ctx; 2272 2273 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2274 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2275 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2276 return -EINVAL; 2277 2278 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2279 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2280 return -EINVAL; 2281 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2282 return -EINVAL; 2283 2284 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2285 if (xp == NULL) 2286 return -ENOBUFS; 2287 2288 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2289 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2290 xp->priority = pol->sadb_x_policy_priority; 2291 2292 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2293 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2294 xp->selector.family = xp->family; 2295 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2296 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2297 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2298 if (xp->selector.sport) 2299 xp->selector.sport_mask = htons(0xffff); 2300 2301 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2302 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2303 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2304 2305 /* Amusing, we set this twice. KAME apps appear to set same value 2306 * in both addresses. 2307 */ 2308 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2309 2310 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2311 if (xp->selector.dport) 2312 xp->selector.dport_mask = htons(0xffff); 2313 2314 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2315 if (sec_ctx != NULL) { 2316 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2317 2318 if (!uctx) { 2319 err = -ENOBUFS; 2320 goto out; 2321 } 2322 2323 err = security_xfrm_policy_alloc(&xp->security, uctx, GFP_KERNEL); 2324 kfree(uctx); 2325 2326 if (err) 2327 goto out; 2328 } 2329 2330 xp->lft.soft_byte_limit = XFRM_INF; 2331 xp->lft.hard_byte_limit = XFRM_INF; 2332 xp->lft.soft_packet_limit = XFRM_INF; 2333 xp->lft.hard_packet_limit = XFRM_INF; 2334 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2335 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2336 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2337 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2338 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2339 } 2340 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2341 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2342 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2343 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2344 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2345 } 2346 xp->xfrm_nr = 0; 2347 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2348 (err = parse_ipsecrequests(xp, pol)) < 0) 2349 goto out; 2350 2351 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2352 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2353 2354 xfrm_audit_policy_add(xp, err ? 0 : 1, true); 2355 2356 if (err) 2357 goto out; 2358 2359 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2360 c.event = XFRM_MSG_UPDPOLICY; 2361 else 2362 c.event = XFRM_MSG_NEWPOLICY; 2363 2364 c.seq = hdr->sadb_msg_seq; 2365 c.portid = hdr->sadb_msg_pid; 2366 2367 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2368 xfrm_pol_put(xp); 2369 return 0; 2370 2371out: 2372 xp->walk.dead = 1; 2373 xfrm_policy_destroy(xp); 2374 return err; 2375} 2376 2377static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2378{ 2379 struct net *net = sock_net(sk); 2380 int err; 2381 struct sadb_address *sa; 2382 struct sadb_x_policy *pol; 2383 struct xfrm_policy *xp; 2384 struct xfrm_selector sel; 2385 struct km_event c; 2386 struct sadb_x_sec_ctx *sec_ctx; 2387 struct xfrm_sec_ctx *pol_ctx = NULL; 2388 2389 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2390 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2391 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2392 return -EINVAL; 2393 2394 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2395 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2396 return -EINVAL; 2397 2398 memset(&sel, 0, sizeof(sel)); 2399 2400 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2401 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2402 sel.prefixlen_s = sa->sadb_address_prefixlen; 2403 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2404 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2405 if (sel.sport) 2406 sel.sport_mask = htons(0xffff); 2407 2408 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2409 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2410 sel.prefixlen_d = sa->sadb_address_prefixlen; 2411 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2412 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2413 if (sel.dport) 2414 sel.dport_mask = htons(0xffff); 2415 2416 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2417 if (sec_ctx != NULL) { 2418 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_KERNEL); 2419 2420 if (!uctx) 2421 return -ENOMEM; 2422 2423 err = security_xfrm_policy_alloc(&pol_ctx, uctx, GFP_KERNEL); 2424 kfree(uctx); 2425 if (err) 2426 return err; 2427 } 2428 2429 xp = xfrm_policy_bysel_ctx(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2430 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2431 1, &err); 2432 security_xfrm_policy_free(pol_ctx); 2433 if (xp == NULL) 2434 return -ENOENT; 2435 2436 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2437 2438 if (err) 2439 goto out; 2440 2441 c.seq = hdr->sadb_msg_seq; 2442 c.portid = hdr->sadb_msg_pid; 2443 c.data.byid = 0; 2444 c.event = XFRM_MSG_DELPOLICY; 2445 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2446 2447out: 2448 xfrm_pol_put(xp); 2449 return err; 2450} 2451 2452static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2453{ 2454 int err; 2455 struct sk_buff *out_skb; 2456 struct sadb_msg *out_hdr; 2457 err = 0; 2458 2459 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2460 if (IS_ERR(out_skb)) { 2461 err = PTR_ERR(out_skb); 2462 goto out; 2463 } 2464 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2465 if (err < 0) { 2466 kfree_skb(out_skb); 2467 goto out; 2468 } 2469 2470 out_hdr = (struct sadb_msg *) out_skb->data; 2471 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2472 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2473 out_hdr->sadb_msg_satype = 0; 2474 out_hdr->sadb_msg_errno = 0; 2475 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2476 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2477 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2478 err = 0; 2479 2480out: 2481 return err; 2482} 2483 2484static int pfkey_sockaddr_pair_size(sa_family_t family) 2485{ 2486 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2487} 2488 2489static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2490 xfrm_address_t *saddr, xfrm_address_t *daddr, 2491 u16 *family) 2492{ 2493 int af, socklen; 2494 2495 if (ext_len < 2 || ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2496 return -EINVAL; 2497 2498 af = pfkey_sockaddr_extract(sa, saddr); 2499 if (!af) 2500 return -EINVAL; 2501 2502 socklen = pfkey_sockaddr_len(af); 2503 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2504 daddr) != af) 2505 return -EINVAL; 2506 2507 *family = af; 2508 return 0; 2509} 2510 2511#ifdef CONFIG_NET_KEY_MIGRATE 2512static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2513 struct xfrm_migrate *m) 2514{ 2515 int err; 2516 struct sadb_x_ipsecrequest *rq2; 2517 int mode; 2518 2519 if (len < sizeof(*rq1) || 2520 len < rq1->sadb_x_ipsecrequest_len || 2521 rq1->sadb_x_ipsecrequest_len < sizeof(*rq1)) 2522 return -EINVAL; 2523 2524 /* old endoints */ 2525 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2526 rq1->sadb_x_ipsecrequest_len - sizeof(*rq1), 2527 &m->old_saddr, &m->old_daddr, 2528 &m->old_family); 2529 if (err) 2530 return err; 2531 2532 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2533 len -= rq1->sadb_x_ipsecrequest_len; 2534 2535 if (len <= sizeof(*rq2) || 2536 len < rq2->sadb_x_ipsecrequest_len || 2537 rq2->sadb_x_ipsecrequest_len < sizeof(*rq2)) 2538 return -EINVAL; 2539 2540 /* new endpoints */ 2541 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2542 rq2->sadb_x_ipsecrequest_len - sizeof(*rq2), 2543 &m->new_saddr, &m->new_daddr, 2544 &m->new_family); 2545 if (err) 2546 return err; 2547 2548 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2549 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2550 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2551 return -EINVAL; 2552 2553 m->proto = rq1->sadb_x_ipsecrequest_proto; 2554 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2555 return -EINVAL; 2556 m->mode = mode; 2557 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2558 2559 return ((int)(rq1->sadb_x_ipsecrequest_len + 2560 rq2->sadb_x_ipsecrequest_len)); 2561} 2562 2563static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2564 const struct sadb_msg *hdr, void * const *ext_hdrs) 2565{ 2566 int i, len, ret, err = -EINVAL; 2567 u8 dir; 2568 struct sadb_address *sa; 2569 struct sadb_x_kmaddress *kma; 2570 struct sadb_x_policy *pol; 2571 struct sadb_x_ipsecrequest *rq; 2572 struct xfrm_selector sel; 2573 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2574 struct xfrm_kmaddress k; 2575 struct net *net = sock_net(sk); 2576 2577 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2578 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2579 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2580 err = -EINVAL; 2581 goto out; 2582 } 2583 2584 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2585 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2586 2587 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2588 err = -EINVAL; 2589 goto out; 2590 } 2591 2592 if (kma) { 2593 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2594 k.reserved = kma->sadb_x_kmaddress_reserved; 2595 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2596 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2597 &k.local, &k.remote, &k.family); 2598 if (ret < 0) { 2599 err = ret; 2600 goto out; 2601 } 2602 } 2603 2604 dir = pol->sadb_x_policy_dir - 1; 2605 memset(&sel, 0, sizeof(sel)); 2606 2607 /* set source address info of selector */ 2608 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2609 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2610 sel.prefixlen_s = sa->sadb_address_prefixlen; 2611 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2612 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2613 if (sel.sport) 2614 sel.sport_mask = htons(0xffff); 2615 2616 /* set destination address info of selector */ 2617 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1]; 2618 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2619 sel.prefixlen_d = sa->sadb_address_prefixlen; 2620 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2621 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2622 if (sel.dport) 2623 sel.dport_mask = htons(0xffff); 2624 2625 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2626 2627 /* extract ipsecrequests */ 2628 i = 0; 2629 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2630 2631 while (len > 0 && i < XFRM_MAX_DEPTH) { 2632 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2633 if (ret < 0) { 2634 err = ret; 2635 goto out; 2636 } else { 2637 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2638 len -= ret; 2639 i++; 2640 } 2641 } 2642 2643 if (!i || len > 0) { 2644 err = -EINVAL; 2645 goto out; 2646 } 2647 2648 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2649 kma ? &k : NULL, net, NULL, 0, NULL, NULL); 2650 2651 out: 2652 return err; 2653} 2654#else 2655static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2656 const struct sadb_msg *hdr, void * const *ext_hdrs) 2657{ 2658 return -ENOPROTOOPT; 2659} 2660#endif 2661 2662 2663static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2664{ 2665 struct net *net = sock_net(sk); 2666 unsigned int dir; 2667 int err = 0, delete; 2668 struct sadb_x_policy *pol; 2669 struct xfrm_policy *xp; 2670 struct km_event c; 2671 2672 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2673 return -EINVAL; 2674 2675 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2676 if (dir >= XFRM_POLICY_MAX) 2677 return -EINVAL; 2678 2679 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2680 xp = xfrm_policy_byid(net, &dummy_mark, 0, XFRM_POLICY_TYPE_MAIN, 2681 dir, pol->sadb_x_policy_id, delete, &err); 2682 if (xp == NULL) 2683 return -ENOENT; 2684 2685 if (delete) { 2686 xfrm_audit_policy_delete(xp, err ? 0 : 1, true); 2687 2688 if (err) 2689 goto out; 2690 c.seq = hdr->sadb_msg_seq; 2691 c.portid = hdr->sadb_msg_pid; 2692 c.data.byid = 1; 2693 c.event = XFRM_MSG_DELPOLICY; 2694 km_policy_notify(xp, dir, &c); 2695 } else { 2696 err = key_pol_get_resp(sk, xp, hdr, dir); 2697 } 2698 2699out: 2700 xfrm_pol_put(xp); 2701 return err; 2702} 2703 2704static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2705{ 2706 struct pfkey_sock *pfk = ptr; 2707 struct sk_buff *out_skb; 2708 struct sadb_msg *out_hdr; 2709 int err; 2710 2711 if (!pfkey_can_dump(&pfk->sk)) 2712 return -ENOBUFS; 2713 2714 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2715 if (IS_ERR(out_skb)) 2716 return PTR_ERR(out_skb); 2717 2718 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2719 if (err < 0) { 2720 kfree_skb(out_skb); 2721 return err; 2722 } 2723 2724 out_hdr = (struct sadb_msg *) out_skb->data; 2725 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2726 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2727 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2728 out_hdr->sadb_msg_errno = 0; 2729 out_hdr->sadb_msg_seq = count + 1; 2730 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2731 2732 if (pfk->dump.skb) 2733 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2734 &pfk->sk, sock_net(&pfk->sk)); 2735 pfk->dump.skb = out_skb; 2736 2737 return 0; 2738} 2739 2740static int pfkey_dump_sp(struct pfkey_sock *pfk) 2741{ 2742 struct net *net = sock_net(&pfk->sk); 2743 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2744} 2745 2746static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2747{ 2748 struct net *net = sock_net((struct sock *)pfk); 2749 2750 xfrm_policy_walk_done(&pfk->dump.u.policy, net); 2751} 2752 2753static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2754{ 2755 struct pfkey_sock *pfk = pfkey_sk(sk); 2756 2757 mutex_lock(&pfk->dump_lock); 2758 if (pfk->dump.dump != NULL) { 2759 mutex_unlock(&pfk->dump_lock); 2760 return -EBUSY; 2761 } 2762 2763 pfk->dump.msg_version = hdr->sadb_msg_version; 2764 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2765 pfk->dump.dump = pfkey_dump_sp; 2766 pfk->dump.done = pfkey_dump_sp_done; 2767 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2768 mutex_unlock(&pfk->dump_lock); 2769 2770 return pfkey_do_dump(pfk); 2771} 2772 2773static int key_notify_policy_flush(const struct km_event *c) 2774{ 2775 struct sk_buff *skb_out; 2776 struct sadb_msg *hdr; 2777 2778 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2779 if (!skb_out) 2780 return -ENOBUFS; 2781 hdr = skb_put(skb_out, sizeof(struct sadb_msg)); 2782 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2783 hdr->sadb_msg_seq = c->seq; 2784 hdr->sadb_msg_pid = c->portid; 2785 hdr->sadb_msg_version = PF_KEY_V2; 2786 hdr->sadb_msg_errno = (uint8_t) 0; 2787 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2788 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2789 hdr->sadb_msg_reserved = 0; 2790 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2791 return 0; 2792 2793} 2794 2795static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2796{ 2797 struct net *net = sock_net(sk); 2798 struct km_event c; 2799 int err, err2; 2800 2801 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); 2802 err2 = unicast_flush_resp(sk, hdr); 2803 if (err || err2) { 2804 if (err == -ESRCH) /* empty table - old silent behavior */ 2805 return 0; 2806 return err; 2807 } 2808 2809 c.data.type = XFRM_POLICY_TYPE_MAIN; 2810 c.event = XFRM_MSG_FLUSHPOLICY; 2811 c.portid = hdr->sadb_msg_pid; 2812 c.seq = hdr->sadb_msg_seq; 2813 c.net = net; 2814 km_policy_notify(NULL, 0, &c); 2815 2816 return 0; 2817} 2818 2819typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2820 const struct sadb_msg *hdr, void * const *ext_hdrs); 2821static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2822 [SADB_RESERVED] = pfkey_reserved, 2823 [SADB_GETSPI] = pfkey_getspi, 2824 [SADB_UPDATE] = pfkey_add, 2825 [SADB_ADD] = pfkey_add, 2826 [SADB_DELETE] = pfkey_delete, 2827 [SADB_GET] = pfkey_get, 2828 [SADB_ACQUIRE] = pfkey_acquire, 2829 [SADB_REGISTER] = pfkey_register, 2830 [SADB_EXPIRE] = NULL, 2831 [SADB_FLUSH] = pfkey_flush, 2832 [SADB_DUMP] = pfkey_dump, 2833 [SADB_X_PROMISC] = pfkey_promisc, 2834 [SADB_X_PCHANGE] = NULL, 2835 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2836 [SADB_X_SPDADD] = pfkey_spdadd, 2837 [SADB_X_SPDDELETE] = pfkey_spddelete, 2838 [SADB_X_SPDGET] = pfkey_spdget, 2839 [SADB_X_SPDACQUIRE] = NULL, 2840 [SADB_X_SPDDUMP] = pfkey_spddump, 2841 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2842 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2843 [SADB_X_SPDDELETE2] = pfkey_spdget, 2844 [SADB_X_MIGRATE] = pfkey_migrate, 2845}; 2846 2847static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2848{ 2849 void *ext_hdrs[SADB_EXT_MAX]; 2850 int err; 2851 2852 /* Non-zero return value of pfkey_broadcast() does not always signal 2853 * an error and even on an actual error we may still want to process 2854 * the message so rather ignore the return value. 2855 */ 2856 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2857 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2858 2859 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2860 err = parse_exthdrs(skb, hdr, ext_hdrs); 2861 if (!err) { 2862 err = -EOPNOTSUPP; 2863 if (pfkey_funcs[hdr->sadb_msg_type]) 2864 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2865 } 2866 return err; 2867} 2868 2869static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2870{ 2871 struct sadb_msg *hdr = NULL; 2872 2873 if (skb->len < sizeof(*hdr)) { 2874 *errp = -EMSGSIZE; 2875 } else { 2876 hdr = (struct sadb_msg *) skb->data; 2877 if (hdr->sadb_msg_version != PF_KEY_V2 || 2878 hdr->sadb_msg_reserved != 0 || 2879 (hdr->sadb_msg_type <= SADB_RESERVED || 2880 hdr->sadb_msg_type > SADB_MAX)) { 2881 hdr = NULL; 2882 *errp = -EINVAL; 2883 } else if (hdr->sadb_msg_len != (skb->len / 2884 sizeof(uint64_t)) || 2885 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2886 sizeof(uint64_t))) { 2887 hdr = NULL; 2888 *errp = -EMSGSIZE; 2889 } else { 2890 *errp = 0; 2891 } 2892 } 2893 return hdr; 2894} 2895 2896static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2897 const struct xfrm_algo_desc *d) 2898{ 2899 unsigned int id = d->desc.sadb_alg_id; 2900 2901 if (id >= sizeof(t->aalgos) * 8) 2902 return 0; 2903 2904 return (t->aalgos >> id) & 1; 2905} 2906 2907static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2908 const struct xfrm_algo_desc *d) 2909{ 2910 unsigned int id = d->desc.sadb_alg_id; 2911 2912 if (id >= sizeof(t->ealgos) * 8) 2913 return 0; 2914 2915 return (t->ealgos >> id) & 1; 2916} 2917 2918static int count_ah_combs(const struct xfrm_tmpl *t) 2919{ 2920 int i, sz = 0; 2921 2922 for (i = 0; ; i++) { 2923 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2924 if (!aalg) 2925 break; 2926 if (!aalg->pfkey_supported) 2927 continue; 2928 if (aalg_tmpl_set(t, aalg)) 2929 sz += sizeof(struct sadb_comb); 2930 } 2931 return sz + sizeof(struct sadb_prop); 2932} 2933 2934static int count_esp_combs(const struct xfrm_tmpl *t) 2935{ 2936 int i, k, sz = 0; 2937 2938 for (i = 0; ; i++) { 2939 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2940 if (!ealg) 2941 break; 2942 2943 if (!ealg->pfkey_supported) 2944 continue; 2945 2946 if (!(ealg_tmpl_set(t, ealg))) 2947 continue; 2948 2949 for (k = 1; ; k++) { 2950 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2951 if (!aalg) 2952 break; 2953 2954 if (!aalg->pfkey_supported) 2955 continue; 2956 2957 if (aalg_tmpl_set(t, aalg)) 2958 sz += sizeof(struct sadb_comb); 2959 } 2960 } 2961 return sz + sizeof(struct sadb_prop); 2962} 2963 2964static int dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2965{ 2966 struct sadb_prop *p; 2967 int sz = 0; 2968 int i; 2969 2970 p = skb_put(skb, sizeof(struct sadb_prop)); 2971 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2972 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2973 p->sadb_prop_replay = 32; 2974 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2975 2976 for (i = 0; ; i++) { 2977 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2978 if (!aalg) 2979 break; 2980 2981 if (!aalg->pfkey_supported) 2982 continue; 2983 2984 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2985 struct sadb_comb *c; 2986 c = skb_put_zero(skb, sizeof(struct sadb_comb)); 2987 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2988 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2989 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2990 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2991 c->sadb_comb_hard_addtime = 24*60*60; 2992 c->sadb_comb_soft_addtime = 20*60*60; 2993 c->sadb_comb_hard_usetime = 8*60*60; 2994 c->sadb_comb_soft_usetime = 7*60*60; 2995 sz += sizeof(*c); 2996 } 2997 } 2998 2999 return sz + sizeof(*p); 3000} 3001 3002static int dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 3003{ 3004 struct sadb_prop *p; 3005 int sz = 0; 3006 int i, k; 3007 3008 p = skb_put(skb, sizeof(struct sadb_prop)); 3009 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 3010 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 3011 p->sadb_prop_replay = 32; 3012 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 3013 3014 for (i=0; ; i++) { 3015 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 3016 if (!ealg) 3017 break; 3018 3019 if (!ealg->pfkey_supported) 3020 continue; 3021 3022 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 3023 continue; 3024 3025 for (k = 1; ; k++) { 3026 struct sadb_comb *c; 3027 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 3028 if (!aalg) 3029 break; 3030 if (!aalg->pfkey_supported) 3031 continue; 3032 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 3033 continue; 3034 c = skb_put(skb, sizeof(struct sadb_comb)); 3035 memset(c, 0, sizeof(*c)); 3036 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 3037 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 3038 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 3039 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 3040 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 3041 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 3042 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 3043 c->sadb_comb_hard_addtime = 24*60*60; 3044 c->sadb_comb_soft_addtime = 20*60*60; 3045 c->sadb_comb_hard_usetime = 8*60*60; 3046 c->sadb_comb_soft_usetime = 7*60*60; 3047 sz += sizeof(*c); 3048 } 3049 } 3050 3051 return sz + sizeof(*p); 3052} 3053 3054static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 3055{ 3056 return 0; 3057} 3058 3059static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 3060{ 3061 struct sk_buff *out_skb; 3062 struct sadb_msg *out_hdr; 3063 int hard; 3064 int hsc; 3065 3066 hard = c->data.hard; 3067 if (hard) 3068 hsc = 2; 3069 else 3070 hsc = 1; 3071 3072 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 3073 if (IS_ERR(out_skb)) 3074 return PTR_ERR(out_skb); 3075 3076 out_hdr = (struct sadb_msg *) out_skb->data; 3077 out_hdr->sadb_msg_version = PF_KEY_V2; 3078 out_hdr->sadb_msg_type = SADB_EXPIRE; 3079 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3080 out_hdr->sadb_msg_errno = 0; 3081 out_hdr->sadb_msg_reserved = 0; 3082 out_hdr->sadb_msg_seq = 0; 3083 out_hdr->sadb_msg_pid = 0; 3084 3085 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3086 xs_net(x)); 3087 return 0; 3088} 3089 3090static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 3091{ 3092 struct net *net = x ? xs_net(x) : c->net; 3093 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3094 3095 if (atomic_read(&net_pfkey->socks_nr) == 0) 3096 return 0; 3097 3098 switch (c->event) { 3099 case XFRM_MSG_EXPIRE: 3100 return key_notify_sa_expire(x, c); 3101 case XFRM_MSG_DELSA: 3102 case XFRM_MSG_NEWSA: 3103 case XFRM_MSG_UPDSA: 3104 return key_notify_sa(x, c); 3105 case XFRM_MSG_FLUSHSA: 3106 return key_notify_sa_flush(c); 3107 case XFRM_MSG_NEWAE: /* not yet supported */ 3108 break; 3109 default: 3110 pr_err("pfkey: Unknown SA event %d\n", c->event); 3111 break; 3112 } 3113 3114 return 0; 3115} 3116 3117static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3118{ 3119 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3120 return 0; 3121 3122 switch (c->event) { 3123 case XFRM_MSG_POLEXPIRE: 3124 return key_notify_policy_expire(xp, c); 3125 case XFRM_MSG_DELPOLICY: 3126 case XFRM_MSG_NEWPOLICY: 3127 case XFRM_MSG_UPDPOLICY: 3128 return key_notify_policy(xp, dir, c); 3129 case XFRM_MSG_FLUSHPOLICY: 3130 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3131 break; 3132 return key_notify_policy_flush(c); 3133 default: 3134 pr_err("pfkey: Unknown policy event %d\n", c->event); 3135 break; 3136 } 3137 3138 return 0; 3139} 3140 3141static u32 get_acqseq(void) 3142{ 3143 u32 res; 3144 static atomic_t acqseq; 3145 3146 do { 3147 res = atomic_inc_return(&acqseq); 3148 } while (!res); 3149 return res; 3150} 3151 3152static bool pfkey_is_alive(const struct km_event *c) 3153{ 3154 struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id); 3155 struct sock *sk; 3156 bool is_alive = false; 3157 3158 rcu_read_lock(); 3159 sk_for_each_rcu(sk, &net_pfkey->table) { 3160 if (pfkey_sk(sk)->registered) { 3161 is_alive = true; 3162 break; 3163 } 3164 } 3165 rcu_read_unlock(); 3166 3167 return is_alive; 3168} 3169 3170static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3171{ 3172 struct sk_buff *skb; 3173 struct sadb_msg *hdr; 3174 struct sadb_address *addr; 3175 struct sadb_x_policy *pol; 3176 int sockaddr_size; 3177 int size; 3178 struct sadb_x_sec_ctx *sec_ctx; 3179 struct xfrm_sec_ctx *xfrm_ctx; 3180 int ctx_size = 0; 3181 int alg_size = 0; 3182 3183 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3184 if (!sockaddr_size) 3185 return -EINVAL; 3186 3187 size = sizeof(struct sadb_msg) + 3188 (sizeof(struct sadb_address) * 2) + 3189 (sockaddr_size * 2) + 3190 sizeof(struct sadb_x_policy); 3191 3192 if (x->id.proto == IPPROTO_AH) 3193 alg_size = count_ah_combs(t); 3194 else if (x->id.proto == IPPROTO_ESP) 3195 alg_size = count_esp_combs(t); 3196 3197 if ((xfrm_ctx = x->security)) { 3198 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3199 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3200 } 3201 3202 skb = alloc_skb(size + alg_size + 16, GFP_ATOMIC); 3203 if (skb == NULL) 3204 return -ENOMEM; 3205 3206 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3207 hdr->sadb_msg_version = PF_KEY_V2; 3208 hdr->sadb_msg_type = SADB_ACQUIRE; 3209 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3210 hdr->sadb_msg_len = size / sizeof(uint64_t); 3211 hdr->sadb_msg_errno = 0; 3212 hdr->sadb_msg_reserved = 0; 3213 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3214 hdr->sadb_msg_pid = 0; 3215 3216 /* src address */ 3217 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3218 addr->sadb_address_len = 3219 (sizeof(struct sadb_address)+sockaddr_size)/ 3220 sizeof(uint64_t); 3221 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3222 addr->sadb_address_proto = 0; 3223 addr->sadb_address_reserved = 0; 3224 addr->sadb_address_prefixlen = 3225 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0, 3226 (struct sockaddr *)(addr + 1), 3227 x->props.family); 3228 if (!addr->sadb_address_prefixlen) 3229 BUG(); 3230 3231 /* dst address */ 3232 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3233 addr->sadb_address_len = 3234 (sizeof(struct sadb_address)+sockaddr_size)/ 3235 sizeof(uint64_t); 3236 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3237 addr->sadb_address_proto = 0; 3238 addr->sadb_address_reserved = 0; 3239 addr->sadb_address_prefixlen = 3240 pfkey_sockaddr_fill_zero_tail(&x->id.daddr, 0, 3241 (struct sockaddr *)(addr + 1), 3242 x->props.family); 3243 if (!addr->sadb_address_prefixlen) 3244 BUG(); 3245 3246 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3247 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3248 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3249 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3250 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3251 pol->sadb_x_policy_reserved = 0; 3252 pol->sadb_x_policy_id = xp->index; 3253 pol->sadb_x_policy_priority = xp->priority; 3254 3255 /* Set sadb_comb's. */ 3256 alg_size = 0; 3257 if (x->id.proto == IPPROTO_AH) 3258 alg_size = dump_ah_combs(skb, t); 3259 else if (x->id.proto == IPPROTO_ESP) 3260 alg_size = dump_esp_combs(skb, t); 3261 3262 hdr->sadb_msg_len += alg_size / 8; 3263 3264 /* security context */ 3265 if (xfrm_ctx) { 3266 sec_ctx = skb_put(skb, 3267 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3268 sec_ctx->sadb_x_sec_len = 3269 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3270 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3271 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3272 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3273 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3274 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3275 xfrm_ctx->ctx_len); 3276 } 3277 3278 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3279 xs_net(x)); 3280} 3281 3282static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3283 u8 *data, int len, int *dir) 3284{ 3285 struct net *net = sock_net(sk); 3286 struct xfrm_policy *xp; 3287 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3288 struct sadb_x_sec_ctx *sec_ctx; 3289 3290 switch (sk->sk_family) { 3291 case AF_INET: 3292 if (opt != IP_IPSEC_POLICY) { 3293 *dir = -EOPNOTSUPP; 3294 return NULL; 3295 } 3296 break; 3297#if IS_ENABLED(CONFIG_IPV6) 3298 case AF_INET6: 3299 if (opt != IPV6_IPSEC_POLICY) { 3300 *dir = -EOPNOTSUPP; 3301 return NULL; 3302 } 3303 break; 3304#endif 3305 default: 3306 *dir = -EINVAL; 3307 return NULL; 3308 } 3309 3310 *dir = -EINVAL; 3311 3312 if (len < sizeof(struct sadb_x_policy) || 3313 pol->sadb_x_policy_len*8 > len || 3314 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3315 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3316 return NULL; 3317 3318 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3319 if (xp == NULL) { 3320 *dir = -ENOBUFS; 3321 return NULL; 3322 } 3323 3324 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3325 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3326 3327 xp->lft.soft_byte_limit = XFRM_INF; 3328 xp->lft.hard_byte_limit = XFRM_INF; 3329 xp->lft.soft_packet_limit = XFRM_INF; 3330 xp->lft.hard_packet_limit = XFRM_INF; 3331 xp->family = sk->sk_family; 3332 3333 xp->xfrm_nr = 0; 3334 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3335 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3336 goto out; 3337 3338 /* security context too */ 3339 if (len >= (pol->sadb_x_policy_len*8 + 3340 sizeof(struct sadb_x_sec_ctx))) { 3341 char *p = (char *)pol; 3342 struct xfrm_user_sec_ctx *uctx; 3343 3344 p += pol->sadb_x_policy_len*8; 3345 sec_ctx = (struct sadb_x_sec_ctx *)p; 3346 if (len < pol->sadb_x_policy_len*8 + 3347 sec_ctx->sadb_x_sec_len*8) { 3348 *dir = -EINVAL; 3349 goto out; 3350 } 3351 if ((*dir = verify_sec_ctx_len(p))) 3352 goto out; 3353 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx, GFP_ATOMIC); 3354 *dir = security_xfrm_policy_alloc(&xp->security, uctx, GFP_ATOMIC); 3355 kfree(uctx); 3356 3357 if (*dir) 3358 goto out; 3359 } 3360 3361 *dir = pol->sadb_x_policy_dir-1; 3362 return xp; 3363 3364out: 3365 xp->walk.dead = 1; 3366 xfrm_policy_destroy(xp); 3367 return NULL; 3368} 3369 3370static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3371{ 3372 struct sk_buff *skb; 3373 struct sadb_msg *hdr; 3374 struct sadb_sa *sa; 3375 struct sadb_address *addr; 3376 struct sadb_x_nat_t_port *n_port; 3377 int sockaddr_size; 3378 int size; 3379 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3380 struct xfrm_encap_tmpl *natt = NULL; 3381 3382 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3383 if (!sockaddr_size) 3384 return -EINVAL; 3385 3386 if (!satype) 3387 return -EINVAL; 3388 3389 if (!x->encap) 3390 return -EINVAL; 3391 3392 natt = x->encap; 3393 3394 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3395 * 3396 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3397 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3398 */ 3399 3400 size = sizeof(struct sadb_msg) + 3401 sizeof(struct sadb_sa) + 3402 (sizeof(struct sadb_address) * 2) + 3403 (sockaddr_size * 2) + 3404 (sizeof(struct sadb_x_nat_t_port) * 2); 3405 3406 skb = alloc_skb(size + 16, GFP_ATOMIC); 3407 if (skb == NULL) 3408 return -ENOMEM; 3409 3410 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3411 hdr->sadb_msg_version = PF_KEY_V2; 3412 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3413 hdr->sadb_msg_satype = satype; 3414 hdr->sadb_msg_len = size / sizeof(uint64_t); 3415 hdr->sadb_msg_errno = 0; 3416 hdr->sadb_msg_reserved = 0; 3417 hdr->sadb_msg_seq = x->km.seq; 3418 hdr->sadb_msg_pid = 0; 3419 3420 /* SA */ 3421 sa = skb_put(skb, sizeof(struct sadb_sa)); 3422 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3423 sa->sadb_sa_exttype = SADB_EXT_SA; 3424 sa->sadb_sa_spi = x->id.spi; 3425 sa->sadb_sa_replay = 0; 3426 sa->sadb_sa_state = 0; 3427 sa->sadb_sa_auth = 0; 3428 sa->sadb_sa_encrypt = 0; 3429 sa->sadb_sa_flags = 0; 3430 3431 /* ADDRESS_SRC (old addr) */ 3432 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3433 addr->sadb_address_len = 3434 (sizeof(struct sadb_address)+sockaddr_size)/ 3435 sizeof(uint64_t); 3436 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3437 addr->sadb_address_proto = 0; 3438 addr->sadb_address_reserved = 0; 3439 addr->sadb_address_prefixlen = 3440 pfkey_sockaddr_fill_zero_tail(&x->props.saddr, 0, 3441 (struct sockaddr *)(addr + 1), 3442 x->props.family); 3443 if (!addr->sadb_address_prefixlen) 3444 BUG(); 3445 3446 /* NAT_T_SPORT (old port) */ 3447 n_port = skb_put(skb, sizeof(*n_port)); 3448 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3449 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3450 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3451 n_port->sadb_x_nat_t_port_reserved = 0; 3452 3453 /* ADDRESS_DST (new addr) */ 3454 addr = skb_put(skb, sizeof(struct sadb_address) + sockaddr_size); 3455 addr->sadb_address_len = 3456 (sizeof(struct sadb_address)+sockaddr_size)/ 3457 sizeof(uint64_t); 3458 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3459 addr->sadb_address_proto = 0; 3460 addr->sadb_address_reserved = 0; 3461 addr->sadb_address_prefixlen = 3462 pfkey_sockaddr_fill_zero_tail(ipaddr, 0, 3463 (struct sockaddr *)(addr + 1), 3464 x->props.family); 3465 if (!addr->sadb_address_prefixlen) 3466 BUG(); 3467 3468 /* NAT_T_DPORT (new port) */ 3469 n_port = skb_put(skb, sizeof(*n_port)); 3470 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3471 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3472 n_port->sadb_x_nat_t_port_port = sport; 3473 n_port->sadb_x_nat_t_port_reserved = 0; 3474 3475 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, 3476 xs_net(x)); 3477} 3478 3479#ifdef CONFIG_NET_KEY_MIGRATE 3480static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3481 const struct xfrm_selector *sel) 3482{ 3483 struct sadb_address *addr; 3484 addr = skb_put(skb, sizeof(struct sadb_address) + sasize); 3485 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3486 addr->sadb_address_exttype = type; 3487 addr->sadb_address_proto = sel->proto; 3488 addr->sadb_address_reserved = 0; 3489 3490 switch (type) { 3491 case SADB_EXT_ADDRESS_SRC: 3492 addr->sadb_address_prefixlen = sel->prefixlen_s; 3493 pfkey_sockaddr_fill_zero_tail(&sel->saddr, 0, 3494 (struct sockaddr *)(addr + 1), 3495 sel->family); 3496 break; 3497 case SADB_EXT_ADDRESS_DST: 3498 addr->sadb_address_prefixlen = sel->prefixlen_d; 3499 pfkey_sockaddr_fill_zero_tail(&sel->daddr, 0, 3500 (struct sockaddr *)(addr + 1), 3501 sel->family); 3502 break; 3503 default: 3504 return -EINVAL; 3505 } 3506 3507 return 0; 3508} 3509 3510 3511static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3512{ 3513 struct sadb_x_kmaddress *kma; 3514 u8 *sa; 3515 int family = k->family; 3516 int socklen = pfkey_sockaddr_len(family); 3517 int size_req; 3518 3519 size_req = (sizeof(struct sadb_x_kmaddress) + 3520 pfkey_sockaddr_pair_size(family)); 3521 3522 kma = skb_put_zero(skb, size_req); 3523 kma->sadb_x_kmaddress_len = size_req / 8; 3524 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3525 kma->sadb_x_kmaddress_reserved = k->reserved; 3526 3527 sa = (u8 *)(kma + 1); 3528 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3529 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3530 return -EINVAL; 3531 3532 return 0; 3533} 3534 3535static int set_ipsecrequest(struct sk_buff *skb, 3536 uint8_t proto, uint8_t mode, int level, 3537 uint32_t reqid, sa_family_t family, 3538 const xfrm_address_t *src, const xfrm_address_t *dst) 3539{ 3540 struct sadb_x_ipsecrequest *rq; 3541 u8 *sa; 3542 int socklen = pfkey_sockaddr_len(family); 3543 int size_req; 3544 3545 size_req = sizeof(struct sadb_x_ipsecrequest) + 3546 pfkey_sockaddr_pair_size(family); 3547 3548 rq = skb_put_zero(skb, size_req); 3549 rq->sadb_x_ipsecrequest_len = size_req; 3550 rq->sadb_x_ipsecrequest_proto = proto; 3551 rq->sadb_x_ipsecrequest_mode = mode; 3552 rq->sadb_x_ipsecrequest_level = level; 3553 rq->sadb_x_ipsecrequest_reqid = reqid; 3554 3555 sa = (u8 *) (rq + 1); 3556 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3557 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3558 return -EINVAL; 3559 3560 return 0; 3561} 3562#endif 3563 3564#ifdef CONFIG_NET_KEY_MIGRATE 3565static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3566 const struct xfrm_migrate *m, int num_bundles, 3567 const struct xfrm_kmaddress *k, 3568 const struct xfrm_encap_tmpl *encap) 3569{ 3570 int i; 3571 int sasize_sel; 3572 int size = 0; 3573 int size_pol = 0; 3574 struct sk_buff *skb; 3575 struct sadb_msg *hdr; 3576 struct sadb_x_policy *pol; 3577 const struct xfrm_migrate *mp; 3578 3579 if (type != XFRM_POLICY_TYPE_MAIN) 3580 return 0; 3581 3582 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3583 return -EINVAL; 3584 3585 if (k != NULL) { 3586 /* addresses for KM */ 3587 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3588 pfkey_sockaddr_pair_size(k->family)); 3589 } 3590 3591 /* selector */ 3592 sasize_sel = pfkey_sockaddr_size(sel->family); 3593 if (!sasize_sel) 3594 return -EINVAL; 3595 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3596 3597 /* policy info */ 3598 size_pol += sizeof(struct sadb_x_policy); 3599 3600 /* ipsecrequests */ 3601 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3602 int pair_size; 3603 3604 pair_size = pfkey_sockaddr_pair_size(mp->old_family); 3605 if (!pair_size) 3606 return -EINVAL; 3607 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size; 3608 3609 pair_size = pfkey_sockaddr_pair_size(mp->new_family); 3610 if (!pair_size) 3611 return -EINVAL; 3612 size_pol += sizeof(struct sadb_x_ipsecrequest) + pair_size; 3613 } 3614 3615 size += sizeof(struct sadb_msg) + size_pol; 3616 3617 /* alloc buffer */ 3618 skb = alloc_skb(size, GFP_ATOMIC); 3619 if (skb == NULL) 3620 return -ENOMEM; 3621 3622 hdr = skb_put(skb, sizeof(struct sadb_msg)); 3623 hdr->sadb_msg_version = PF_KEY_V2; 3624 hdr->sadb_msg_type = SADB_X_MIGRATE; 3625 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3626 hdr->sadb_msg_len = size / 8; 3627 hdr->sadb_msg_errno = 0; 3628 hdr->sadb_msg_reserved = 0; 3629 hdr->sadb_msg_seq = 0; 3630 hdr->sadb_msg_pid = 0; 3631 3632 /* Addresses to be used by KM for negotiation, if ext is available */ 3633 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3634 goto err; 3635 3636 /* selector src */ 3637 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3638 3639 /* selector dst */ 3640 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3641 3642 /* policy information */ 3643 pol = skb_put(skb, sizeof(struct sadb_x_policy)); 3644 pol->sadb_x_policy_len = size_pol / 8; 3645 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3646 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3647 pol->sadb_x_policy_dir = dir + 1; 3648 pol->sadb_x_policy_reserved = 0; 3649 pol->sadb_x_policy_id = 0; 3650 pol->sadb_x_policy_priority = 0; 3651 3652 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3653 /* old ipsecrequest */ 3654 int mode = pfkey_mode_from_xfrm(mp->mode); 3655 if (mode < 0) 3656 goto err; 3657 if (set_ipsecrequest(skb, mp->proto, mode, 3658 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3659 mp->reqid, mp->old_family, 3660 &mp->old_saddr, &mp->old_daddr) < 0) 3661 goto err; 3662 3663 /* new ipsecrequest */ 3664 if (set_ipsecrequest(skb, mp->proto, mode, 3665 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3666 mp->reqid, mp->new_family, 3667 &mp->new_saddr, &mp->new_daddr) < 0) 3668 goto err; 3669 } 3670 3671 /* broadcast migrate message to sockets */ 3672 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3673 3674 return 0; 3675 3676err: 3677 kfree_skb(skb); 3678 return -EINVAL; 3679} 3680#else 3681static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3682 const struct xfrm_migrate *m, int num_bundles, 3683 const struct xfrm_kmaddress *k, 3684 const struct xfrm_encap_tmpl *encap) 3685{ 3686 return -ENOPROTOOPT; 3687} 3688#endif 3689 3690static int pfkey_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 3691{ 3692 struct sock *sk = sock->sk; 3693 struct sk_buff *skb = NULL; 3694 struct sadb_msg *hdr = NULL; 3695 int err; 3696 struct net *net = sock_net(sk); 3697 3698 err = -EOPNOTSUPP; 3699 if (msg->msg_flags & MSG_OOB) 3700 goto out; 3701 3702 err = -EMSGSIZE; 3703 if ((unsigned int)len > sk->sk_sndbuf - 32) 3704 goto out; 3705 3706 err = -ENOBUFS; 3707 skb = alloc_skb(len, GFP_KERNEL); 3708 if (skb == NULL) 3709 goto out; 3710 3711 err = -EFAULT; 3712 if (memcpy_from_msg(skb_put(skb,len), msg, len)) 3713 goto out; 3714 3715 hdr = pfkey_get_base_msg(skb, &err); 3716 if (!hdr) 3717 goto out; 3718 3719 mutex_lock(&net->xfrm.xfrm_cfg_mutex); 3720 err = pfkey_process(sk, skb, hdr); 3721 mutex_unlock(&net->xfrm.xfrm_cfg_mutex); 3722 3723out: 3724 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3725 err = 0; 3726 kfree_skb(skb); 3727 3728 return err ? : len; 3729} 3730 3731static int pfkey_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 3732 int flags) 3733{ 3734 struct sock *sk = sock->sk; 3735 struct pfkey_sock *pfk = pfkey_sk(sk); 3736 struct sk_buff *skb; 3737 int copied, err; 3738 3739 err = -EINVAL; 3740 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3741 goto out; 3742 3743 skb = skb_recv_datagram(sk, flags, &err); 3744 if (skb == NULL) 3745 goto out; 3746 3747 copied = skb->len; 3748 if (copied > len) { 3749 msg->msg_flags |= MSG_TRUNC; 3750 copied = len; 3751 } 3752 3753 skb_reset_transport_header(skb); 3754 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3755 if (err) 3756 goto out_free; 3757 3758 sock_recv_cmsgs(msg, sk, skb); 3759 3760 err = (flags & MSG_TRUNC) ? skb->len : copied; 3761 3762 if (pfk->dump.dump != NULL && 3763 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3764 pfkey_do_dump(pfk); 3765 3766out_free: 3767 skb_free_datagram(sk, skb); 3768out: 3769 return err; 3770} 3771 3772static const struct proto_ops pfkey_ops = { 3773 .family = PF_KEY, 3774 .owner = THIS_MODULE, 3775 /* Operations that make no sense on pfkey sockets. */ 3776 .bind = sock_no_bind, 3777 .connect = sock_no_connect, 3778 .socketpair = sock_no_socketpair, 3779 .accept = sock_no_accept, 3780 .getname = sock_no_getname, 3781 .ioctl = sock_no_ioctl, 3782 .listen = sock_no_listen, 3783 .shutdown = sock_no_shutdown, 3784 .mmap = sock_no_mmap, 3785 3786 /* Now the operations that really occur. */ 3787 .release = pfkey_release, 3788 .poll = datagram_poll, 3789 .sendmsg = pfkey_sendmsg, 3790 .recvmsg = pfkey_recvmsg, 3791}; 3792 3793static const struct net_proto_family pfkey_family_ops = { 3794 .family = PF_KEY, 3795 .create = pfkey_create, 3796 .owner = THIS_MODULE, 3797}; 3798 3799#ifdef CONFIG_PROC_FS 3800static int pfkey_seq_show(struct seq_file *f, void *v) 3801{ 3802 struct sock *s = sk_entry(v); 3803 3804 if (v == SEQ_START_TOKEN) 3805 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3806 else 3807 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3808 s, 3809 refcount_read(&s->sk_refcnt), 3810 sk_rmem_alloc_get(s), 3811 sk_wmem_alloc_get(s), 3812 from_kuid_munged(seq_user_ns(f), sk_uid(s)), 3813 sock_i_ino(s) 3814 ); 3815 return 0; 3816} 3817 3818static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3819 __acquires(rcu) 3820{ 3821 struct net *net = seq_file_net(f); 3822 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3823 3824 rcu_read_lock(); 3825 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3826} 3827 3828static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3829{ 3830 struct net *net = seq_file_net(f); 3831 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3832 3833 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3834} 3835 3836static void pfkey_seq_stop(struct seq_file *f, void *v) 3837 __releases(rcu) 3838{ 3839 rcu_read_unlock(); 3840} 3841 3842static const struct seq_operations pfkey_seq_ops = { 3843 .start = pfkey_seq_start, 3844 .next = pfkey_seq_next, 3845 .stop = pfkey_seq_stop, 3846 .show = pfkey_seq_show, 3847}; 3848 3849static int __net_init pfkey_init_proc(struct net *net) 3850{ 3851 struct proc_dir_entry *e; 3852 3853 e = proc_create_net("pfkey", 0, net->proc_net, &pfkey_seq_ops, 3854 sizeof(struct seq_net_private)); 3855 if (e == NULL) 3856 return -ENOMEM; 3857 3858 return 0; 3859} 3860 3861static void __net_exit pfkey_exit_proc(struct net *net) 3862{ 3863 remove_proc_entry("pfkey", net->proc_net); 3864} 3865#else 3866static inline int pfkey_init_proc(struct net *net) 3867{ 3868 return 0; 3869} 3870 3871static inline void pfkey_exit_proc(struct net *net) 3872{ 3873} 3874#endif 3875 3876static struct xfrm_mgr pfkeyv2_mgr = 3877{ 3878 .notify = pfkey_send_notify, 3879 .acquire = pfkey_send_acquire, 3880 .compile_policy = pfkey_compile_policy, 3881 .new_mapping = pfkey_send_new_mapping, 3882 .notify_policy = pfkey_send_policy_notify, 3883 .migrate = pfkey_send_migrate, 3884 .is_alive = pfkey_is_alive, 3885}; 3886 3887static int __net_init pfkey_net_init(struct net *net) 3888{ 3889 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3890 int rv; 3891 3892 INIT_HLIST_HEAD(&net_pfkey->table); 3893 atomic_set(&net_pfkey->socks_nr, 0); 3894 3895 rv = pfkey_init_proc(net); 3896 3897 return rv; 3898} 3899 3900static void __net_exit pfkey_net_exit(struct net *net) 3901{ 3902 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3903 3904 pfkey_exit_proc(net); 3905 WARN_ON(!hlist_empty(&net_pfkey->table)); 3906} 3907 3908static struct pernet_operations pfkey_net_ops = { 3909 .init = pfkey_net_init, 3910 .exit = pfkey_net_exit, 3911 .id = &pfkey_net_id, 3912 .size = sizeof(struct netns_pfkey), 3913}; 3914 3915static void __exit ipsec_pfkey_exit(void) 3916{ 3917 xfrm_unregister_km(&pfkeyv2_mgr); 3918 sock_unregister(PF_KEY); 3919 unregister_pernet_subsys(&pfkey_net_ops); 3920 proto_unregister(&key_proto); 3921} 3922 3923static int __init ipsec_pfkey_init(void) 3924{ 3925 int err = proto_register(&key_proto, 0); 3926 3927 pr_warn_once("PFKEY is deprecated and scheduled to be removed in 2027, " 3928 "please contact the netdev mailing list\n"); 3929 if (err != 0) 3930 goto out; 3931 3932 err = register_pernet_subsys(&pfkey_net_ops); 3933 if (err != 0) 3934 goto out_unregister_key_proto; 3935 err = sock_register(&pfkey_family_ops); 3936 if (err != 0) 3937 goto out_unregister_pernet; 3938 xfrm_register_km(&pfkeyv2_mgr); 3939out: 3940 return err; 3941 3942out_unregister_pernet: 3943 unregister_pernet_subsys(&pfkey_net_ops); 3944out_unregister_key_proto: 3945 proto_unregister(&key_proto); 3946 goto out; 3947} 3948 3949module_init(ipsec_pfkey_init); 3950module_exit(ipsec_pfkey_exit); 3951MODULE_DESCRIPTION("PF_KEY socket helpers"); 3952MODULE_LICENSE("GPL"); 3953MODULE_ALIAS_NETPROTO(PF_KEY);
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