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