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