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