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 = sa->sadb_sa_replay; 1102 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1103 x->props.flags |= XFRM_STATE_NOECN; 1104 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1105 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1106 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1107 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1108 1109 lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD - 1]; 1110 if (lifetime != NULL) { 1111 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1112 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1113 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1114 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1115 } 1116 lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT - 1]; 1117 if (lifetime != NULL) { 1118 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1119 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1120 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1121 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1122 } 1123 1124 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 1125 if (sec_ctx != NULL) { 1126 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1127 1128 if (!uctx) 1129 goto out; 1130 1131 err = security_xfrm_state_alloc(x, uctx); 1132 kfree(uctx); 1133 1134 if (err) 1135 goto out; 1136 } 1137 1138 key = ext_hdrs[SADB_EXT_KEY_AUTH - 1]; 1139 if (sa->sadb_sa_auth) { 1140 int keysize = 0; 1141 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1142 if (!a || !a->pfkey_supported) { 1143 err = -ENOSYS; 1144 goto out; 1145 } 1146 if (key) 1147 keysize = (key->sadb_key_bits + 7) / 8; 1148 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1149 if (!x->aalg) 1150 goto out; 1151 strcpy(x->aalg->alg_name, a->name); 1152 x->aalg->alg_key_len = 0; 1153 if (key) { 1154 x->aalg->alg_key_len = key->sadb_key_bits; 1155 memcpy(x->aalg->alg_key, key+1, keysize); 1156 } 1157 x->aalg->alg_trunc_len = a->uinfo.auth.icv_truncbits; 1158 x->props.aalgo = sa->sadb_sa_auth; 1159 /* x->algo.flags = sa->sadb_sa_flags; */ 1160 } 1161 if (sa->sadb_sa_encrypt) { 1162 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1163 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1164 if (!a || !a->pfkey_supported) { 1165 err = -ENOSYS; 1166 goto out; 1167 } 1168 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1169 if (!x->calg) 1170 goto out; 1171 strcpy(x->calg->alg_name, a->name); 1172 x->props.calgo = sa->sadb_sa_encrypt; 1173 } else { 1174 int keysize = 0; 1175 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1176 if (!a || !a->pfkey_supported) { 1177 err = -ENOSYS; 1178 goto out; 1179 } 1180 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1181 if (key) 1182 keysize = (key->sadb_key_bits + 7) / 8; 1183 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1184 if (!x->ealg) 1185 goto out; 1186 strcpy(x->ealg->alg_name, a->name); 1187 x->ealg->alg_key_len = 0; 1188 if (key) { 1189 x->ealg->alg_key_len = key->sadb_key_bits; 1190 memcpy(x->ealg->alg_key, key+1, keysize); 1191 } 1192 x->props.ealgo = sa->sadb_sa_encrypt; 1193 } 1194 } 1195 /* x->algo.flags = sa->sadb_sa_flags; */ 1196 1197 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1198 &x->props.saddr); 1199 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1200 &x->id.daddr); 1201 1202 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1203 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1204 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1205 if (mode < 0) { 1206 err = -EINVAL; 1207 goto out; 1208 } 1209 x->props.mode = mode; 1210 x->props.reqid = sa2->sadb_x_sa2_reqid; 1211 } 1212 1213 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1214 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1215 1216 /* Nobody uses this, but we try. */ 1217 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1218 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1219 } 1220 1221 if (!x->sel.family) 1222 x->sel.family = x->props.family; 1223 1224 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1225 const struct sadb_x_nat_t_type* n_type; 1226 struct xfrm_encap_tmpl *natt; 1227 1228 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1229 if (!x->encap) 1230 goto out; 1231 1232 natt = x->encap; 1233 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1234 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1235 1236 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1237 const struct sadb_x_nat_t_port *n_port = 1238 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1239 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1240 } 1241 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1242 const struct sadb_x_nat_t_port *n_port = 1243 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1244 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1245 } 1246 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1247 } 1248 1249 err = xfrm_init_state(x); 1250 if (err) 1251 goto out; 1252 1253 x->km.seq = hdr->sadb_msg_seq; 1254 return x; 1255 1256 out: 1257 x->km.state = XFRM_STATE_DEAD; 1258 xfrm_state_put(x); 1259 return ERR_PTR(err); 1260 } 1261 1262 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1263 { 1264 return -EOPNOTSUPP; 1265 } 1266 1267 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1268 { 1269 struct net *net = sock_net(sk); 1270 struct sk_buff *resp_skb; 1271 struct sadb_x_sa2 *sa2; 1272 struct sadb_address *saddr, *daddr; 1273 struct sadb_msg *out_hdr; 1274 struct sadb_spirange *range; 1275 struct xfrm_state *x = NULL; 1276 int mode; 1277 int err; 1278 u32 min_spi, max_spi; 1279 u32 reqid; 1280 u8 proto; 1281 unsigned short family; 1282 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1283 1284 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1285 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1286 return -EINVAL; 1287 1288 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1289 if (proto == 0) 1290 return -EINVAL; 1291 1292 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1293 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1294 if (mode < 0) 1295 return -EINVAL; 1296 reqid = sa2->sadb_x_sa2_reqid; 1297 } else { 1298 mode = 0; 1299 reqid = 0; 1300 } 1301 1302 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1303 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1304 1305 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1306 switch (family) { 1307 case AF_INET: 1308 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1309 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1310 break; 1311 #if IS_ENABLED(CONFIG_IPV6) 1312 case AF_INET6: 1313 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1314 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1315 break; 1316 #endif 1317 } 1318 1319 if (hdr->sadb_msg_seq) { 1320 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1321 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1322 xfrm_state_put(x); 1323 x = NULL; 1324 } 1325 } 1326 1327 if (!x) 1328 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1329 1330 if (x == NULL) 1331 return -ENOENT; 1332 1333 min_spi = 0x100; 1334 max_spi = 0x0fffffff; 1335 1336 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1337 if (range) { 1338 min_spi = range->sadb_spirange_min; 1339 max_spi = range->sadb_spirange_max; 1340 } 1341 1342 err = xfrm_alloc_spi(x, min_spi, max_spi); 1343 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1344 1345 if (IS_ERR(resp_skb)) { 1346 xfrm_state_put(x); 1347 return PTR_ERR(resp_skb); 1348 } 1349 1350 out_hdr = (struct sadb_msg *) resp_skb->data; 1351 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1352 out_hdr->sadb_msg_type = SADB_GETSPI; 1353 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1354 out_hdr->sadb_msg_errno = 0; 1355 out_hdr->sadb_msg_reserved = 0; 1356 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1357 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1358 1359 xfrm_state_put(x); 1360 1361 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1362 1363 return 0; 1364 } 1365 1366 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1367 { 1368 struct net *net = sock_net(sk); 1369 struct xfrm_state *x; 1370 1371 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1372 return -EOPNOTSUPP; 1373 1374 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1375 return 0; 1376 1377 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1378 if (x == NULL) 1379 return 0; 1380 1381 spin_lock_bh(&x->lock); 1382 if (x->km.state == XFRM_STATE_ACQ) { 1383 x->km.state = XFRM_STATE_ERROR; 1384 wake_up(&net->xfrm.km_waitq); 1385 } 1386 spin_unlock_bh(&x->lock); 1387 xfrm_state_put(x); 1388 return 0; 1389 } 1390 1391 static inline int event2poltype(int event) 1392 { 1393 switch (event) { 1394 case XFRM_MSG_DELPOLICY: 1395 return SADB_X_SPDDELETE; 1396 case XFRM_MSG_NEWPOLICY: 1397 return SADB_X_SPDADD; 1398 case XFRM_MSG_UPDPOLICY: 1399 return SADB_X_SPDUPDATE; 1400 case XFRM_MSG_POLEXPIRE: 1401 // return SADB_X_SPDEXPIRE; 1402 default: 1403 pr_err("pfkey: Unknown policy event %d\n", event); 1404 break; 1405 } 1406 1407 return 0; 1408 } 1409 1410 static inline int event2keytype(int event) 1411 { 1412 switch (event) { 1413 case XFRM_MSG_DELSA: 1414 return SADB_DELETE; 1415 case XFRM_MSG_NEWSA: 1416 return SADB_ADD; 1417 case XFRM_MSG_UPDSA: 1418 return SADB_UPDATE; 1419 case XFRM_MSG_EXPIRE: 1420 return SADB_EXPIRE; 1421 default: 1422 pr_err("pfkey: Unknown SA event %d\n", event); 1423 break; 1424 } 1425 1426 return 0; 1427 } 1428 1429 /* ADD/UPD/DEL */ 1430 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1431 { 1432 struct sk_buff *skb; 1433 struct sadb_msg *hdr; 1434 1435 skb = pfkey_xfrm_state2msg(x); 1436 1437 if (IS_ERR(skb)) 1438 return PTR_ERR(skb); 1439 1440 hdr = (struct sadb_msg *) skb->data; 1441 hdr->sadb_msg_version = PF_KEY_V2; 1442 hdr->sadb_msg_type = event2keytype(c->event); 1443 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1444 hdr->sadb_msg_errno = 0; 1445 hdr->sadb_msg_reserved = 0; 1446 hdr->sadb_msg_seq = c->seq; 1447 hdr->sadb_msg_pid = c->portid; 1448 1449 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1450 1451 return 0; 1452 } 1453 1454 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1455 { 1456 struct net *net = sock_net(sk); 1457 struct xfrm_state *x; 1458 int err; 1459 struct km_event c; 1460 1461 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1462 if (IS_ERR(x)) 1463 return PTR_ERR(x); 1464 1465 xfrm_state_hold(x); 1466 if (hdr->sadb_msg_type == SADB_ADD) 1467 err = xfrm_state_add(x); 1468 else 1469 err = xfrm_state_update(x); 1470 1471 xfrm_audit_state_add(x, err ? 0 : 1, 1472 audit_get_loginuid(current), 1473 audit_get_sessionid(current), 0); 1474 1475 if (err < 0) { 1476 x->km.state = XFRM_STATE_DEAD; 1477 __xfrm_state_put(x); 1478 goto out; 1479 } 1480 1481 if (hdr->sadb_msg_type == SADB_ADD) 1482 c.event = XFRM_MSG_NEWSA; 1483 else 1484 c.event = XFRM_MSG_UPDSA; 1485 c.seq = hdr->sadb_msg_seq; 1486 c.portid = hdr->sadb_msg_pid; 1487 km_state_notify(x, &c); 1488 out: 1489 xfrm_state_put(x); 1490 return err; 1491 } 1492 1493 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1494 { 1495 struct net *net = sock_net(sk); 1496 struct xfrm_state *x; 1497 struct km_event c; 1498 int err; 1499 1500 if (!ext_hdrs[SADB_EXT_SA-1] || 1501 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1502 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1503 return -EINVAL; 1504 1505 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1506 if (x == NULL) 1507 return -ESRCH; 1508 1509 if ((err = security_xfrm_state_delete(x))) 1510 goto out; 1511 1512 if (xfrm_state_kern(x)) { 1513 err = -EPERM; 1514 goto out; 1515 } 1516 1517 err = xfrm_state_delete(x); 1518 1519 if (err < 0) 1520 goto out; 1521 1522 c.seq = hdr->sadb_msg_seq; 1523 c.portid = hdr->sadb_msg_pid; 1524 c.event = XFRM_MSG_DELSA; 1525 km_state_notify(x, &c); 1526 out: 1527 xfrm_audit_state_delete(x, err ? 0 : 1, 1528 audit_get_loginuid(current), 1529 audit_get_sessionid(current), 0); 1530 xfrm_state_put(x); 1531 1532 return err; 1533 } 1534 1535 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1536 { 1537 struct net *net = sock_net(sk); 1538 __u8 proto; 1539 struct sk_buff *out_skb; 1540 struct sadb_msg *out_hdr; 1541 struct xfrm_state *x; 1542 1543 if (!ext_hdrs[SADB_EXT_SA-1] || 1544 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1545 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1546 return -EINVAL; 1547 1548 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1549 if (x == NULL) 1550 return -ESRCH; 1551 1552 out_skb = pfkey_xfrm_state2msg(x); 1553 proto = x->id.proto; 1554 xfrm_state_put(x); 1555 if (IS_ERR(out_skb)) 1556 return PTR_ERR(out_skb); 1557 1558 out_hdr = (struct sadb_msg *) out_skb->data; 1559 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1560 out_hdr->sadb_msg_type = SADB_GET; 1561 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1562 out_hdr->sadb_msg_errno = 0; 1563 out_hdr->sadb_msg_reserved = 0; 1564 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1565 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1566 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1567 1568 return 0; 1569 } 1570 1571 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1572 gfp_t allocation) 1573 { 1574 struct sk_buff *skb; 1575 struct sadb_msg *hdr; 1576 int len, auth_len, enc_len, i; 1577 1578 auth_len = xfrm_count_pfkey_auth_supported(); 1579 if (auth_len) { 1580 auth_len *= sizeof(struct sadb_alg); 1581 auth_len += sizeof(struct sadb_supported); 1582 } 1583 1584 enc_len = xfrm_count_pfkey_enc_supported(); 1585 if (enc_len) { 1586 enc_len *= sizeof(struct sadb_alg); 1587 enc_len += sizeof(struct sadb_supported); 1588 } 1589 1590 len = enc_len + auth_len + sizeof(struct sadb_msg); 1591 1592 skb = alloc_skb(len + 16, allocation); 1593 if (!skb) 1594 goto out_put_algs; 1595 1596 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1597 pfkey_hdr_dup(hdr, orig); 1598 hdr->sadb_msg_errno = 0; 1599 hdr->sadb_msg_len = len / sizeof(uint64_t); 1600 1601 if (auth_len) { 1602 struct sadb_supported *sp; 1603 struct sadb_alg *ap; 1604 1605 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1606 ap = (struct sadb_alg *) (sp + 1); 1607 1608 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1609 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1610 1611 for (i = 0; ; i++) { 1612 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1613 if (!aalg) 1614 break; 1615 if (!aalg->pfkey_supported) 1616 continue; 1617 if (aalg->available) 1618 *ap++ = aalg->desc; 1619 } 1620 } 1621 1622 if (enc_len) { 1623 struct sadb_supported *sp; 1624 struct sadb_alg *ap; 1625 1626 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1627 ap = (struct sadb_alg *) (sp + 1); 1628 1629 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1630 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1631 1632 for (i = 0; ; i++) { 1633 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1634 if (!ealg) 1635 break; 1636 if (!ealg->pfkey_supported) 1637 continue; 1638 if (ealg->available) 1639 *ap++ = ealg->desc; 1640 } 1641 } 1642 1643 out_put_algs: 1644 return skb; 1645 } 1646 1647 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1648 { 1649 struct pfkey_sock *pfk = pfkey_sk(sk); 1650 struct sk_buff *supp_skb; 1651 1652 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1653 return -EINVAL; 1654 1655 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1656 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1657 return -EEXIST; 1658 pfk->registered |= (1<<hdr->sadb_msg_satype); 1659 } 1660 1661 xfrm_probe_algs(); 1662 1663 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1664 if (!supp_skb) { 1665 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1666 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1667 1668 return -ENOBUFS; 1669 } 1670 1671 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk)); 1672 1673 return 0; 1674 } 1675 1676 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1677 { 1678 struct sk_buff *skb; 1679 struct sadb_msg *hdr; 1680 1681 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1682 if (!skb) 1683 return -ENOBUFS; 1684 1685 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1686 memcpy(hdr, ihdr, sizeof(struct sadb_msg)); 1687 hdr->sadb_msg_errno = (uint8_t) 0; 1688 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1689 1690 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1691 } 1692 1693 static int key_notify_sa_flush(const struct km_event *c) 1694 { 1695 struct sk_buff *skb; 1696 struct sadb_msg *hdr; 1697 1698 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1699 if (!skb) 1700 return -ENOBUFS; 1701 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1702 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1703 hdr->sadb_msg_type = SADB_FLUSH; 1704 hdr->sadb_msg_seq = c->seq; 1705 hdr->sadb_msg_pid = c->portid; 1706 hdr->sadb_msg_version = PF_KEY_V2; 1707 hdr->sadb_msg_errno = (uint8_t) 0; 1708 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1709 hdr->sadb_msg_reserved = 0; 1710 1711 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1712 1713 return 0; 1714 } 1715 1716 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1717 { 1718 struct net *net = sock_net(sk); 1719 unsigned int proto; 1720 struct km_event c; 1721 struct xfrm_audit audit_info; 1722 int err, err2; 1723 1724 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1725 if (proto == 0) 1726 return -EINVAL; 1727 1728 audit_info.loginuid = audit_get_loginuid(current); 1729 audit_info.sessionid = audit_get_sessionid(current); 1730 audit_info.secid = 0; 1731 err = xfrm_state_flush(net, proto, &audit_info); 1732 err2 = unicast_flush_resp(sk, hdr); 1733 if (err || err2) { 1734 if (err == -ESRCH) /* empty table - go quietly */ 1735 err = 0; 1736 return err ? err : err2; 1737 } 1738 1739 c.data.proto = proto; 1740 c.seq = hdr->sadb_msg_seq; 1741 c.portid = hdr->sadb_msg_pid; 1742 c.event = XFRM_MSG_FLUSHSA; 1743 c.net = net; 1744 km_state_notify(NULL, &c); 1745 1746 return 0; 1747 } 1748 1749 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1750 { 1751 struct pfkey_sock *pfk = ptr; 1752 struct sk_buff *out_skb; 1753 struct sadb_msg *out_hdr; 1754 1755 if (!pfkey_can_dump(&pfk->sk)) 1756 return -ENOBUFS; 1757 1758 out_skb = pfkey_xfrm_state2msg(x); 1759 if (IS_ERR(out_skb)) 1760 return PTR_ERR(out_skb); 1761 1762 out_hdr = (struct sadb_msg *) out_skb->data; 1763 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1764 out_hdr->sadb_msg_type = SADB_DUMP; 1765 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1766 out_hdr->sadb_msg_errno = 0; 1767 out_hdr->sadb_msg_reserved = 0; 1768 out_hdr->sadb_msg_seq = count + 1; 1769 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1770 1771 if (pfk->dump.skb) 1772 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1773 &pfk->sk, sock_net(&pfk->sk)); 1774 pfk->dump.skb = out_skb; 1775 1776 return 0; 1777 } 1778 1779 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1780 { 1781 struct net *net = sock_net(&pfk->sk); 1782 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1783 } 1784 1785 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1786 { 1787 xfrm_state_walk_done(&pfk->dump.u.state); 1788 } 1789 1790 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1791 { 1792 u8 proto; 1793 struct pfkey_sock *pfk = pfkey_sk(sk); 1794 1795 if (pfk->dump.dump != NULL) 1796 return -EBUSY; 1797 1798 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1799 if (proto == 0) 1800 return -EINVAL; 1801 1802 pfk->dump.msg_version = hdr->sadb_msg_version; 1803 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1804 pfk->dump.dump = pfkey_dump_sa; 1805 pfk->dump.done = pfkey_dump_sa_done; 1806 xfrm_state_walk_init(&pfk->dump.u.state, proto); 1807 1808 return pfkey_do_dump(pfk); 1809 } 1810 1811 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1812 { 1813 struct pfkey_sock *pfk = pfkey_sk(sk); 1814 int satype = hdr->sadb_msg_satype; 1815 bool reset_errno = false; 1816 1817 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1818 reset_errno = true; 1819 if (satype != 0 && satype != 1) 1820 return -EINVAL; 1821 pfk->promisc = satype; 1822 } 1823 if (reset_errno && skb_cloned(skb)) 1824 skb = skb_copy(skb, GFP_KERNEL); 1825 else 1826 skb = skb_clone(skb, GFP_KERNEL); 1827 1828 if (reset_errno && skb) { 1829 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1830 new_hdr->sadb_msg_errno = 0; 1831 } 1832 1833 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1834 return 0; 1835 } 1836 1837 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1838 { 1839 int i; 1840 u32 reqid = *(u32*)ptr; 1841 1842 for (i=0; i<xp->xfrm_nr; i++) { 1843 if (xp->xfrm_vec[i].reqid == reqid) 1844 return -EEXIST; 1845 } 1846 return 0; 1847 } 1848 1849 static u32 gen_reqid(struct net *net) 1850 { 1851 struct xfrm_policy_walk walk; 1852 u32 start; 1853 int rc; 1854 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1855 1856 start = reqid; 1857 do { 1858 ++reqid; 1859 if (reqid == 0) 1860 reqid = IPSEC_MANUAL_REQID_MAX+1; 1861 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1862 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1863 xfrm_policy_walk_done(&walk); 1864 if (rc != -EEXIST) 1865 return reqid; 1866 } while (reqid != start); 1867 return 0; 1868 } 1869 1870 static int 1871 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1872 { 1873 struct net *net = xp_net(xp); 1874 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1875 int mode; 1876 1877 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1878 return -ELOOP; 1879 1880 if (rq->sadb_x_ipsecrequest_mode == 0) 1881 return -EINVAL; 1882 1883 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1884 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1885 return -EINVAL; 1886 t->mode = mode; 1887 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1888 t->optional = 1; 1889 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1890 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1891 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1892 t->reqid = 0; 1893 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1894 return -ENOBUFS; 1895 } 1896 1897 /* addresses present only in tunnel mode */ 1898 if (t->mode == XFRM_MODE_TUNNEL) { 1899 u8 *sa = (u8 *) (rq + 1); 1900 int family, socklen; 1901 1902 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1903 &t->saddr); 1904 if (!family) 1905 return -EINVAL; 1906 1907 socklen = pfkey_sockaddr_len(family); 1908 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1909 &t->id.daddr) != family) 1910 return -EINVAL; 1911 t->encap_family = family; 1912 } else 1913 t->encap_family = xp->family; 1914 1915 /* No way to set this via kame pfkey */ 1916 t->allalgs = 1; 1917 xp->xfrm_nr++; 1918 return 0; 1919 } 1920 1921 static int 1922 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1923 { 1924 int err; 1925 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1926 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1927 1928 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1929 return -EINVAL; 1930 1931 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1932 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1933 return err; 1934 len -= rq->sadb_x_ipsecrequest_len; 1935 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1936 } 1937 return 0; 1938 } 1939 1940 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1941 { 1942 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1943 1944 if (xfrm_ctx) { 1945 int len = sizeof(struct sadb_x_sec_ctx); 1946 len += xfrm_ctx->ctx_len; 1947 return PFKEY_ALIGN8(len); 1948 } 1949 return 0; 1950 } 1951 1952 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 1953 { 1954 const struct xfrm_tmpl *t; 1955 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1956 int socklen = 0; 1957 int i; 1958 1959 for (i=0; i<xp->xfrm_nr; i++) { 1960 t = xp->xfrm_vec + i; 1961 socklen += pfkey_sockaddr_len(t->encap_family); 1962 } 1963 1964 return sizeof(struct sadb_msg) + 1965 (sizeof(struct sadb_lifetime) * 3) + 1966 (sizeof(struct sadb_address) * 2) + 1967 (sockaddr_size * 2) + 1968 sizeof(struct sadb_x_policy) + 1969 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1970 (socklen * 2) + 1971 pfkey_xfrm_policy2sec_ctx_size(xp); 1972 } 1973 1974 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 1975 { 1976 struct sk_buff *skb; 1977 int size; 1978 1979 size = pfkey_xfrm_policy2msg_size(xp); 1980 1981 skb = alloc_skb(size + 16, GFP_ATOMIC); 1982 if (skb == NULL) 1983 return ERR_PTR(-ENOBUFS); 1984 1985 return skb; 1986 } 1987 1988 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 1989 { 1990 struct sadb_msg *hdr; 1991 struct sadb_address *addr; 1992 struct sadb_lifetime *lifetime; 1993 struct sadb_x_policy *pol; 1994 struct sadb_x_sec_ctx *sec_ctx; 1995 struct xfrm_sec_ctx *xfrm_ctx; 1996 int i; 1997 int size; 1998 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1999 int socklen = pfkey_sockaddr_len(xp->family); 2000 2001 size = pfkey_xfrm_policy2msg_size(xp); 2002 2003 /* call should fill header later */ 2004 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2005 memset(hdr, 0, size); /* XXX do we need this ? */ 2006 2007 /* src address */ 2008 addr = (struct sadb_address*) skb_put(skb, 2009 sizeof(struct sadb_address)+sockaddr_size); 2010 addr->sadb_address_len = 2011 (sizeof(struct sadb_address)+sockaddr_size)/ 2012 sizeof(uint64_t); 2013 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2014 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2015 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2016 addr->sadb_address_reserved = 0; 2017 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2018 xp->selector.sport, 2019 (struct sockaddr *) (addr + 1), 2020 xp->family)) 2021 BUG(); 2022 2023 /* dst address */ 2024 addr = (struct sadb_address*) skb_put(skb, 2025 sizeof(struct sadb_address)+sockaddr_size); 2026 addr->sadb_address_len = 2027 (sizeof(struct sadb_address)+sockaddr_size)/ 2028 sizeof(uint64_t); 2029 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2030 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2031 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2032 addr->sadb_address_reserved = 0; 2033 2034 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2035 (struct sockaddr *) (addr + 1), 2036 xp->family); 2037 2038 /* hard time */ 2039 lifetime = (struct sadb_lifetime *) skb_put(skb, 2040 sizeof(struct sadb_lifetime)); 2041 lifetime->sadb_lifetime_len = 2042 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2043 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2044 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2045 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2046 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2047 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2048 /* soft time */ 2049 lifetime = (struct sadb_lifetime *) skb_put(skb, 2050 sizeof(struct sadb_lifetime)); 2051 lifetime->sadb_lifetime_len = 2052 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2053 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2054 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2055 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2056 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2057 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2058 /* current time */ 2059 lifetime = (struct sadb_lifetime *) skb_put(skb, 2060 sizeof(struct sadb_lifetime)); 2061 lifetime->sadb_lifetime_len = 2062 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2063 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2064 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2065 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2066 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2067 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2068 2069 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2070 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2071 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2072 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2073 if (xp->action == XFRM_POLICY_ALLOW) { 2074 if (xp->xfrm_nr) 2075 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2076 else 2077 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2078 } 2079 pol->sadb_x_policy_dir = dir+1; 2080 pol->sadb_x_policy_reserved = 0; 2081 pol->sadb_x_policy_id = xp->index; 2082 pol->sadb_x_policy_priority = xp->priority; 2083 2084 for (i=0; i<xp->xfrm_nr; i++) { 2085 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2086 struct sadb_x_ipsecrequest *rq; 2087 int req_size; 2088 int mode; 2089 2090 req_size = sizeof(struct sadb_x_ipsecrequest); 2091 if (t->mode == XFRM_MODE_TUNNEL) { 2092 socklen = pfkey_sockaddr_len(t->encap_family); 2093 req_size += socklen * 2; 2094 } else { 2095 size -= 2*socklen; 2096 } 2097 rq = (void*)skb_put(skb, req_size); 2098 pol->sadb_x_policy_len += req_size/8; 2099 memset(rq, 0, sizeof(*rq)); 2100 rq->sadb_x_ipsecrequest_len = req_size; 2101 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2102 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2103 return -EINVAL; 2104 rq->sadb_x_ipsecrequest_mode = mode; 2105 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2106 if (t->reqid) 2107 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2108 if (t->optional) 2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2110 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2111 2112 if (t->mode == XFRM_MODE_TUNNEL) { 2113 u8 *sa = (void *)(rq + 1); 2114 pfkey_sockaddr_fill(&t->saddr, 0, 2115 (struct sockaddr *)sa, 2116 t->encap_family); 2117 pfkey_sockaddr_fill(&t->id.daddr, 0, 2118 (struct sockaddr *) (sa + socklen), 2119 t->encap_family); 2120 } 2121 } 2122 2123 /* security context */ 2124 if ((xfrm_ctx = xp->security)) { 2125 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2126 2127 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2128 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2129 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2130 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2131 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2132 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2133 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2134 xfrm_ctx->ctx_len); 2135 } 2136 2137 hdr->sadb_msg_len = size / sizeof(uint64_t); 2138 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2139 2140 return 0; 2141 } 2142 2143 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2144 { 2145 struct sk_buff *out_skb; 2146 struct sadb_msg *out_hdr; 2147 int err; 2148 2149 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2150 if (IS_ERR(out_skb)) 2151 return PTR_ERR(out_skb); 2152 2153 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2154 if (err < 0) 2155 return err; 2156 2157 out_hdr = (struct sadb_msg *) out_skb->data; 2158 out_hdr->sadb_msg_version = PF_KEY_V2; 2159 2160 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2161 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2162 else 2163 out_hdr->sadb_msg_type = event2poltype(c->event); 2164 out_hdr->sadb_msg_errno = 0; 2165 out_hdr->sadb_msg_seq = c->seq; 2166 out_hdr->sadb_msg_pid = c->portid; 2167 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2168 return 0; 2169 2170 } 2171 2172 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2173 { 2174 struct net *net = sock_net(sk); 2175 int err = 0; 2176 struct sadb_lifetime *lifetime; 2177 struct sadb_address *sa; 2178 struct sadb_x_policy *pol; 2179 struct xfrm_policy *xp; 2180 struct km_event c; 2181 struct sadb_x_sec_ctx *sec_ctx; 2182 2183 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2184 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2185 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2186 return -EINVAL; 2187 2188 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2189 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2190 return -EINVAL; 2191 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2192 return -EINVAL; 2193 2194 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2195 if (xp == NULL) 2196 return -ENOBUFS; 2197 2198 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2199 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2200 xp->priority = pol->sadb_x_policy_priority; 2201 2202 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2203 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2204 xp->selector.family = xp->family; 2205 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2206 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2207 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2208 if (xp->selector.sport) 2209 xp->selector.sport_mask = htons(0xffff); 2210 2211 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2212 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2213 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2214 2215 /* Amusing, we set this twice. KAME apps appear to set same value 2216 * in both addresses. 2217 */ 2218 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2219 2220 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2221 if (xp->selector.dport) 2222 xp->selector.dport_mask = htons(0xffff); 2223 2224 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2225 if (sec_ctx != NULL) { 2226 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2227 2228 if (!uctx) { 2229 err = -ENOBUFS; 2230 goto out; 2231 } 2232 2233 err = security_xfrm_policy_alloc(&xp->security, uctx); 2234 kfree(uctx); 2235 2236 if (err) 2237 goto out; 2238 } 2239 2240 xp->lft.soft_byte_limit = XFRM_INF; 2241 xp->lft.hard_byte_limit = XFRM_INF; 2242 xp->lft.soft_packet_limit = XFRM_INF; 2243 xp->lft.hard_packet_limit = XFRM_INF; 2244 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2245 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2246 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2247 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2248 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2249 } 2250 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2251 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2252 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2253 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2254 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2255 } 2256 xp->xfrm_nr = 0; 2257 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2258 (err = parse_ipsecrequests(xp, pol)) < 0) 2259 goto out; 2260 2261 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2262 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2263 2264 xfrm_audit_policy_add(xp, err ? 0 : 1, 2265 audit_get_loginuid(current), 2266 audit_get_sessionid(current), 0); 2267 2268 if (err) 2269 goto out; 2270 2271 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2272 c.event = XFRM_MSG_UPDPOLICY; 2273 else 2274 c.event = XFRM_MSG_NEWPOLICY; 2275 2276 c.seq = hdr->sadb_msg_seq; 2277 c.portid = hdr->sadb_msg_pid; 2278 2279 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2280 xfrm_pol_put(xp); 2281 return 0; 2282 2283 out: 2284 xp->walk.dead = 1; 2285 xfrm_policy_destroy(xp); 2286 return err; 2287 } 2288 2289 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2290 { 2291 struct net *net = sock_net(sk); 2292 int err; 2293 struct sadb_address *sa; 2294 struct sadb_x_policy *pol; 2295 struct xfrm_policy *xp; 2296 struct xfrm_selector sel; 2297 struct km_event c; 2298 struct sadb_x_sec_ctx *sec_ctx; 2299 struct xfrm_sec_ctx *pol_ctx = NULL; 2300 2301 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2302 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2303 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2304 return -EINVAL; 2305 2306 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2307 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2308 return -EINVAL; 2309 2310 memset(&sel, 0, sizeof(sel)); 2311 2312 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2313 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2314 sel.prefixlen_s = sa->sadb_address_prefixlen; 2315 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2316 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2317 if (sel.sport) 2318 sel.sport_mask = htons(0xffff); 2319 2320 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2321 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2322 sel.prefixlen_d = sa->sadb_address_prefixlen; 2323 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2324 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2325 if (sel.dport) 2326 sel.dport_mask = htons(0xffff); 2327 2328 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2329 if (sec_ctx != NULL) { 2330 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2331 2332 if (!uctx) 2333 return -ENOMEM; 2334 2335 err = security_xfrm_policy_alloc(&pol_ctx, uctx); 2336 kfree(uctx); 2337 if (err) 2338 return err; 2339 } 2340 2341 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2342 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2343 1, &err); 2344 security_xfrm_policy_free(pol_ctx); 2345 if (xp == NULL) 2346 return -ENOENT; 2347 2348 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2349 audit_get_loginuid(current), 2350 audit_get_sessionid(current), 0); 2351 2352 if (err) 2353 goto out; 2354 2355 c.seq = hdr->sadb_msg_seq; 2356 c.portid = hdr->sadb_msg_pid; 2357 c.data.byid = 0; 2358 c.event = XFRM_MSG_DELPOLICY; 2359 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2360 2361 out: 2362 xfrm_pol_put(xp); 2363 if (err == 0) 2364 xfrm_garbage_collect(net); 2365 return err; 2366 } 2367 2368 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2369 { 2370 int err; 2371 struct sk_buff *out_skb; 2372 struct sadb_msg *out_hdr; 2373 err = 0; 2374 2375 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2376 if (IS_ERR(out_skb)) { 2377 err = PTR_ERR(out_skb); 2378 goto out; 2379 } 2380 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2381 if (err < 0) 2382 goto out; 2383 2384 out_hdr = (struct sadb_msg *) out_skb->data; 2385 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2386 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2387 out_hdr->sadb_msg_satype = 0; 2388 out_hdr->sadb_msg_errno = 0; 2389 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2390 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2391 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2392 err = 0; 2393 2394 out: 2395 return err; 2396 } 2397 2398 #ifdef CONFIG_NET_KEY_MIGRATE 2399 static int pfkey_sockaddr_pair_size(sa_family_t family) 2400 { 2401 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2402 } 2403 2404 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2405 xfrm_address_t *saddr, xfrm_address_t *daddr, 2406 u16 *family) 2407 { 2408 int af, socklen; 2409 2410 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2411 return -EINVAL; 2412 2413 af = pfkey_sockaddr_extract(sa, saddr); 2414 if (!af) 2415 return -EINVAL; 2416 2417 socklen = pfkey_sockaddr_len(af); 2418 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2419 daddr) != af) 2420 return -EINVAL; 2421 2422 *family = af; 2423 return 0; 2424 } 2425 2426 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2427 struct xfrm_migrate *m) 2428 { 2429 int err; 2430 struct sadb_x_ipsecrequest *rq2; 2431 int mode; 2432 2433 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2434 len < rq1->sadb_x_ipsecrequest_len) 2435 return -EINVAL; 2436 2437 /* old endoints */ 2438 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2439 rq1->sadb_x_ipsecrequest_len, 2440 &m->old_saddr, &m->old_daddr, 2441 &m->old_family); 2442 if (err) 2443 return err; 2444 2445 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2446 len -= rq1->sadb_x_ipsecrequest_len; 2447 2448 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2449 len < rq2->sadb_x_ipsecrequest_len) 2450 return -EINVAL; 2451 2452 /* new endpoints */ 2453 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2454 rq2->sadb_x_ipsecrequest_len, 2455 &m->new_saddr, &m->new_daddr, 2456 &m->new_family); 2457 if (err) 2458 return err; 2459 2460 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2461 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2462 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2463 return -EINVAL; 2464 2465 m->proto = rq1->sadb_x_ipsecrequest_proto; 2466 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2467 return -EINVAL; 2468 m->mode = mode; 2469 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2470 2471 return ((int)(rq1->sadb_x_ipsecrequest_len + 2472 rq2->sadb_x_ipsecrequest_len)); 2473 } 2474 2475 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2476 const struct sadb_msg *hdr, void * const *ext_hdrs) 2477 { 2478 int i, len, ret, err = -EINVAL; 2479 u8 dir; 2480 struct sadb_address *sa; 2481 struct sadb_x_kmaddress *kma; 2482 struct sadb_x_policy *pol; 2483 struct sadb_x_ipsecrequest *rq; 2484 struct xfrm_selector sel; 2485 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2486 struct xfrm_kmaddress k; 2487 2488 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2489 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2490 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2491 err = -EINVAL; 2492 goto out; 2493 } 2494 2495 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2496 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2497 2498 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2499 err = -EINVAL; 2500 goto out; 2501 } 2502 2503 if (kma) { 2504 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2505 k.reserved = kma->sadb_x_kmaddress_reserved; 2506 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2507 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2508 &k.local, &k.remote, &k.family); 2509 if (ret < 0) { 2510 err = ret; 2511 goto out; 2512 } 2513 } 2514 2515 dir = pol->sadb_x_policy_dir - 1; 2516 memset(&sel, 0, sizeof(sel)); 2517 2518 /* set source address info of selector */ 2519 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2520 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2521 sel.prefixlen_s = sa->sadb_address_prefixlen; 2522 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2523 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2524 if (sel.sport) 2525 sel.sport_mask = htons(0xffff); 2526 2527 /* set destination address info of selector */ 2528 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2529 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2530 sel.prefixlen_d = sa->sadb_address_prefixlen; 2531 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2532 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2533 if (sel.dport) 2534 sel.dport_mask = htons(0xffff); 2535 2536 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2537 2538 /* extract ipsecrequests */ 2539 i = 0; 2540 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2541 2542 while (len > 0 && i < XFRM_MAX_DEPTH) { 2543 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2544 if (ret < 0) { 2545 err = ret; 2546 goto out; 2547 } else { 2548 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2549 len -= ret; 2550 i++; 2551 } 2552 } 2553 2554 if (!i || len > 0) { 2555 err = -EINVAL; 2556 goto out; 2557 } 2558 2559 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2560 kma ? &k : NULL); 2561 2562 out: 2563 return err; 2564 } 2565 #else 2566 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2567 const struct sadb_msg *hdr, void * const *ext_hdrs) 2568 { 2569 return -ENOPROTOOPT; 2570 } 2571 #endif 2572 2573 2574 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2575 { 2576 struct net *net = sock_net(sk); 2577 unsigned int dir; 2578 int err = 0, delete; 2579 struct sadb_x_policy *pol; 2580 struct xfrm_policy *xp; 2581 struct km_event c; 2582 2583 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2584 return -EINVAL; 2585 2586 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2587 if (dir >= XFRM_POLICY_MAX) 2588 return -EINVAL; 2589 2590 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2591 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2592 dir, pol->sadb_x_policy_id, delete, &err); 2593 if (xp == NULL) 2594 return -ENOENT; 2595 2596 if (delete) { 2597 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2598 audit_get_loginuid(current), 2599 audit_get_sessionid(current), 0); 2600 2601 if (err) 2602 goto out; 2603 c.seq = hdr->sadb_msg_seq; 2604 c.portid = hdr->sadb_msg_pid; 2605 c.data.byid = 1; 2606 c.event = XFRM_MSG_DELPOLICY; 2607 km_policy_notify(xp, dir, &c); 2608 } else { 2609 err = key_pol_get_resp(sk, xp, hdr, dir); 2610 } 2611 2612 out: 2613 xfrm_pol_put(xp); 2614 if (delete && err == 0) 2615 xfrm_garbage_collect(net); 2616 return err; 2617 } 2618 2619 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2620 { 2621 struct pfkey_sock *pfk = ptr; 2622 struct sk_buff *out_skb; 2623 struct sadb_msg *out_hdr; 2624 int err; 2625 2626 if (!pfkey_can_dump(&pfk->sk)) 2627 return -ENOBUFS; 2628 2629 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2630 if (IS_ERR(out_skb)) 2631 return PTR_ERR(out_skb); 2632 2633 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2634 if (err < 0) 2635 return err; 2636 2637 out_hdr = (struct sadb_msg *) out_skb->data; 2638 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2639 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2640 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2641 out_hdr->sadb_msg_errno = 0; 2642 out_hdr->sadb_msg_seq = count + 1; 2643 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2644 2645 if (pfk->dump.skb) 2646 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2647 &pfk->sk, sock_net(&pfk->sk)); 2648 pfk->dump.skb = out_skb; 2649 2650 return 0; 2651 } 2652 2653 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2654 { 2655 struct net *net = sock_net(&pfk->sk); 2656 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2657 } 2658 2659 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2660 { 2661 xfrm_policy_walk_done(&pfk->dump.u.policy); 2662 } 2663 2664 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2665 { 2666 struct pfkey_sock *pfk = pfkey_sk(sk); 2667 2668 if (pfk->dump.dump != NULL) 2669 return -EBUSY; 2670 2671 pfk->dump.msg_version = hdr->sadb_msg_version; 2672 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2673 pfk->dump.dump = pfkey_dump_sp; 2674 pfk->dump.done = pfkey_dump_sp_done; 2675 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2676 2677 return pfkey_do_dump(pfk); 2678 } 2679 2680 static int key_notify_policy_flush(const struct km_event *c) 2681 { 2682 struct sk_buff *skb_out; 2683 struct sadb_msg *hdr; 2684 2685 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2686 if (!skb_out) 2687 return -ENOBUFS; 2688 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2689 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2690 hdr->sadb_msg_seq = c->seq; 2691 hdr->sadb_msg_pid = c->portid; 2692 hdr->sadb_msg_version = PF_KEY_V2; 2693 hdr->sadb_msg_errno = (uint8_t) 0; 2694 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2695 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2696 hdr->sadb_msg_reserved = 0; 2697 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2698 return 0; 2699 2700 } 2701 2702 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2703 { 2704 struct net *net = sock_net(sk); 2705 struct km_event c; 2706 struct xfrm_audit audit_info; 2707 int err, err2; 2708 2709 audit_info.loginuid = audit_get_loginuid(current); 2710 audit_info.sessionid = audit_get_sessionid(current); 2711 audit_info.secid = 0; 2712 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); 2713 err2 = unicast_flush_resp(sk, hdr); 2714 if (err || err2) { 2715 if (err == -ESRCH) /* empty table - old silent behavior */ 2716 return 0; 2717 return err; 2718 } 2719 2720 c.data.type = XFRM_POLICY_TYPE_MAIN; 2721 c.event = XFRM_MSG_FLUSHPOLICY; 2722 c.portid = hdr->sadb_msg_pid; 2723 c.seq = hdr->sadb_msg_seq; 2724 c.net = net; 2725 km_policy_notify(NULL, 0, &c); 2726 2727 return 0; 2728 } 2729 2730 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2731 const struct sadb_msg *hdr, void * const *ext_hdrs); 2732 static const pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2733 [SADB_RESERVED] = pfkey_reserved, 2734 [SADB_GETSPI] = pfkey_getspi, 2735 [SADB_UPDATE] = pfkey_add, 2736 [SADB_ADD] = pfkey_add, 2737 [SADB_DELETE] = pfkey_delete, 2738 [SADB_GET] = pfkey_get, 2739 [SADB_ACQUIRE] = pfkey_acquire, 2740 [SADB_REGISTER] = pfkey_register, 2741 [SADB_EXPIRE] = NULL, 2742 [SADB_FLUSH] = pfkey_flush, 2743 [SADB_DUMP] = pfkey_dump, 2744 [SADB_X_PROMISC] = pfkey_promisc, 2745 [SADB_X_PCHANGE] = NULL, 2746 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2747 [SADB_X_SPDADD] = pfkey_spdadd, 2748 [SADB_X_SPDDELETE] = pfkey_spddelete, 2749 [SADB_X_SPDGET] = pfkey_spdget, 2750 [SADB_X_SPDACQUIRE] = NULL, 2751 [SADB_X_SPDDUMP] = pfkey_spddump, 2752 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2753 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2754 [SADB_X_SPDDELETE2] = pfkey_spdget, 2755 [SADB_X_MIGRATE] = pfkey_migrate, 2756 }; 2757 2758 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2759 { 2760 void *ext_hdrs[SADB_EXT_MAX]; 2761 int err; 2762 2763 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2764 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2765 2766 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2767 err = parse_exthdrs(skb, hdr, ext_hdrs); 2768 if (!err) { 2769 err = -EOPNOTSUPP; 2770 if (pfkey_funcs[hdr->sadb_msg_type]) 2771 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2772 } 2773 return err; 2774 } 2775 2776 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2777 { 2778 struct sadb_msg *hdr = NULL; 2779 2780 if (skb->len < sizeof(*hdr)) { 2781 *errp = -EMSGSIZE; 2782 } else { 2783 hdr = (struct sadb_msg *) skb->data; 2784 if (hdr->sadb_msg_version != PF_KEY_V2 || 2785 hdr->sadb_msg_reserved != 0 || 2786 (hdr->sadb_msg_type <= SADB_RESERVED || 2787 hdr->sadb_msg_type > SADB_MAX)) { 2788 hdr = NULL; 2789 *errp = -EINVAL; 2790 } else if (hdr->sadb_msg_len != (skb->len / 2791 sizeof(uint64_t)) || 2792 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2793 sizeof(uint64_t))) { 2794 hdr = NULL; 2795 *errp = -EMSGSIZE; 2796 } else { 2797 *errp = 0; 2798 } 2799 } 2800 return hdr; 2801 } 2802 2803 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2804 const struct xfrm_algo_desc *d) 2805 { 2806 unsigned int id = d->desc.sadb_alg_id; 2807 2808 if (id >= sizeof(t->aalgos) * 8) 2809 return 0; 2810 2811 return (t->aalgos >> id) & 1; 2812 } 2813 2814 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2815 const struct xfrm_algo_desc *d) 2816 { 2817 unsigned int id = d->desc.sadb_alg_id; 2818 2819 if (id >= sizeof(t->ealgos) * 8) 2820 return 0; 2821 2822 return (t->ealgos >> id) & 1; 2823 } 2824 2825 static int count_ah_combs(const struct xfrm_tmpl *t) 2826 { 2827 int i, sz = 0; 2828 2829 for (i = 0; ; i++) { 2830 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2831 if (!aalg) 2832 break; 2833 if (!aalg->pfkey_supported) 2834 continue; 2835 if (aalg_tmpl_set(t, aalg) && aalg->available) 2836 sz += sizeof(struct sadb_comb); 2837 } 2838 return sz + sizeof(struct sadb_prop); 2839 } 2840 2841 static int count_esp_combs(const struct xfrm_tmpl *t) 2842 { 2843 int i, k, sz = 0; 2844 2845 for (i = 0; ; i++) { 2846 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2847 if (!ealg) 2848 break; 2849 2850 if (!ealg->pfkey_supported) 2851 continue; 2852 2853 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2854 continue; 2855 2856 for (k = 1; ; k++) { 2857 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2858 if (!aalg) 2859 break; 2860 2861 if (!aalg->pfkey_supported) 2862 continue; 2863 2864 if (aalg_tmpl_set(t, aalg) && aalg->available) 2865 sz += sizeof(struct sadb_comb); 2866 } 2867 } 2868 return sz + sizeof(struct sadb_prop); 2869 } 2870 2871 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2872 { 2873 struct sadb_prop *p; 2874 int i; 2875 2876 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2877 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2878 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2879 p->sadb_prop_replay = 32; 2880 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2881 2882 for (i = 0; ; i++) { 2883 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2884 if (!aalg) 2885 break; 2886 2887 if (!aalg->pfkey_supported) 2888 continue; 2889 2890 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2891 struct sadb_comb *c; 2892 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2893 memset(c, 0, sizeof(*c)); 2894 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2895 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2896 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2897 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2898 c->sadb_comb_hard_addtime = 24*60*60; 2899 c->sadb_comb_soft_addtime = 20*60*60; 2900 c->sadb_comb_hard_usetime = 8*60*60; 2901 c->sadb_comb_soft_usetime = 7*60*60; 2902 } 2903 } 2904 } 2905 2906 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2907 { 2908 struct sadb_prop *p; 2909 int i, k; 2910 2911 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2912 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2913 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2914 p->sadb_prop_replay = 32; 2915 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2916 2917 for (i=0; ; i++) { 2918 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2919 if (!ealg) 2920 break; 2921 2922 if (!ealg->pfkey_supported) 2923 continue; 2924 2925 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2926 continue; 2927 2928 for (k = 1; ; k++) { 2929 struct sadb_comb *c; 2930 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2931 if (!aalg) 2932 break; 2933 if (!aalg->pfkey_supported) 2934 continue; 2935 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2936 continue; 2937 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2938 memset(c, 0, sizeof(*c)); 2939 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2940 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2941 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2942 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2943 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2944 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2945 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2946 c->sadb_comb_hard_addtime = 24*60*60; 2947 c->sadb_comb_soft_addtime = 20*60*60; 2948 c->sadb_comb_hard_usetime = 8*60*60; 2949 c->sadb_comb_soft_usetime = 7*60*60; 2950 } 2951 } 2952 } 2953 2954 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 2955 { 2956 return 0; 2957 } 2958 2959 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 2960 { 2961 struct sk_buff *out_skb; 2962 struct sadb_msg *out_hdr; 2963 int hard; 2964 int hsc; 2965 2966 hard = c->data.hard; 2967 if (hard) 2968 hsc = 2; 2969 else 2970 hsc = 1; 2971 2972 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2973 if (IS_ERR(out_skb)) 2974 return PTR_ERR(out_skb); 2975 2976 out_hdr = (struct sadb_msg *) out_skb->data; 2977 out_hdr->sadb_msg_version = PF_KEY_V2; 2978 out_hdr->sadb_msg_type = SADB_EXPIRE; 2979 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2980 out_hdr->sadb_msg_errno = 0; 2981 out_hdr->sadb_msg_reserved = 0; 2982 out_hdr->sadb_msg_seq = 0; 2983 out_hdr->sadb_msg_pid = 0; 2984 2985 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2986 return 0; 2987 } 2988 2989 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 2990 { 2991 struct net *net = x ? xs_net(x) : c->net; 2992 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 2993 2994 if (atomic_read(&net_pfkey->socks_nr) == 0) 2995 return 0; 2996 2997 switch (c->event) { 2998 case XFRM_MSG_EXPIRE: 2999 return key_notify_sa_expire(x, c); 3000 case XFRM_MSG_DELSA: 3001 case XFRM_MSG_NEWSA: 3002 case XFRM_MSG_UPDSA: 3003 return key_notify_sa(x, c); 3004 case XFRM_MSG_FLUSHSA: 3005 return key_notify_sa_flush(c); 3006 case XFRM_MSG_NEWAE: /* not yet supported */ 3007 break; 3008 default: 3009 pr_err("pfkey: Unknown SA event %d\n", c->event); 3010 break; 3011 } 3012 3013 return 0; 3014 } 3015 3016 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3017 { 3018 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3019 return 0; 3020 3021 switch (c->event) { 3022 case XFRM_MSG_POLEXPIRE: 3023 return key_notify_policy_expire(xp, c); 3024 case XFRM_MSG_DELPOLICY: 3025 case XFRM_MSG_NEWPOLICY: 3026 case XFRM_MSG_UPDPOLICY: 3027 return key_notify_policy(xp, dir, c); 3028 case XFRM_MSG_FLUSHPOLICY: 3029 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3030 break; 3031 return key_notify_policy_flush(c); 3032 default: 3033 pr_err("pfkey: Unknown policy event %d\n", c->event); 3034 break; 3035 } 3036 3037 return 0; 3038 } 3039 3040 static u32 get_acqseq(void) 3041 { 3042 u32 res; 3043 static atomic_t acqseq; 3044 3045 do { 3046 res = atomic_inc_return(&acqseq); 3047 } while (!res); 3048 return res; 3049 } 3050 3051 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3052 { 3053 struct sk_buff *skb; 3054 struct sadb_msg *hdr; 3055 struct sadb_address *addr; 3056 struct sadb_x_policy *pol; 3057 int sockaddr_size; 3058 int size; 3059 struct sadb_x_sec_ctx *sec_ctx; 3060 struct xfrm_sec_ctx *xfrm_ctx; 3061 int ctx_size = 0; 3062 3063 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3064 if (!sockaddr_size) 3065 return -EINVAL; 3066 3067 size = sizeof(struct sadb_msg) + 3068 (sizeof(struct sadb_address) * 2) + 3069 (sockaddr_size * 2) + 3070 sizeof(struct sadb_x_policy); 3071 3072 if (x->id.proto == IPPROTO_AH) 3073 size += count_ah_combs(t); 3074 else if (x->id.proto == IPPROTO_ESP) 3075 size += count_esp_combs(t); 3076 3077 if ((xfrm_ctx = x->security)) { 3078 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3079 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3080 } 3081 3082 skb = alloc_skb(size + 16, GFP_ATOMIC); 3083 if (skb == NULL) 3084 return -ENOMEM; 3085 3086 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3087 hdr->sadb_msg_version = PF_KEY_V2; 3088 hdr->sadb_msg_type = SADB_ACQUIRE; 3089 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3090 hdr->sadb_msg_len = size / sizeof(uint64_t); 3091 hdr->sadb_msg_errno = 0; 3092 hdr->sadb_msg_reserved = 0; 3093 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3094 hdr->sadb_msg_pid = 0; 3095 3096 /* src address */ 3097 addr = (struct sadb_address*) skb_put(skb, 3098 sizeof(struct sadb_address)+sockaddr_size); 3099 addr->sadb_address_len = 3100 (sizeof(struct sadb_address)+sockaddr_size)/ 3101 sizeof(uint64_t); 3102 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3103 addr->sadb_address_proto = 0; 3104 addr->sadb_address_reserved = 0; 3105 addr->sadb_address_prefixlen = 3106 pfkey_sockaddr_fill(&x->props.saddr, 0, 3107 (struct sockaddr *) (addr + 1), 3108 x->props.family); 3109 if (!addr->sadb_address_prefixlen) 3110 BUG(); 3111 3112 /* dst address */ 3113 addr = (struct sadb_address*) skb_put(skb, 3114 sizeof(struct sadb_address)+sockaddr_size); 3115 addr->sadb_address_len = 3116 (sizeof(struct sadb_address)+sockaddr_size)/ 3117 sizeof(uint64_t); 3118 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3119 addr->sadb_address_proto = 0; 3120 addr->sadb_address_reserved = 0; 3121 addr->sadb_address_prefixlen = 3122 pfkey_sockaddr_fill(&x->id.daddr, 0, 3123 (struct sockaddr *) (addr + 1), 3124 x->props.family); 3125 if (!addr->sadb_address_prefixlen) 3126 BUG(); 3127 3128 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3129 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3130 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3131 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3132 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3133 pol->sadb_x_policy_reserved = 0; 3134 pol->sadb_x_policy_id = xp->index; 3135 pol->sadb_x_policy_priority = xp->priority; 3136 3137 /* Set sadb_comb's. */ 3138 if (x->id.proto == IPPROTO_AH) 3139 dump_ah_combs(skb, t); 3140 else if (x->id.proto == IPPROTO_ESP) 3141 dump_esp_combs(skb, t); 3142 3143 /* security context */ 3144 if (xfrm_ctx) { 3145 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3146 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3147 sec_ctx->sadb_x_sec_len = 3148 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3149 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3150 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3151 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3152 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3153 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3154 xfrm_ctx->ctx_len); 3155 } 3156 3157 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3158 } 3159 3160 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3161 u8 *data, int len, int *dir) 3162 { 3163 struct net *net = sock_net(sk); 3164 struct xfrm_policy *xp; 3165 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3166 struct sadb_x_sec_ctx *sec_ctx; 3167 3168 switch (sk->sk_family) { 3169 case AF_INET: 3170 if (opt != IP_IPSEC_POLICY) { 3171 *dir = -EOPNOTSUPP; 3172 return NULL; 3173 } 3174 break; 3175 #if IS_ENABLED(CONFIG_IPV6) 3176 case AF_INET6: 3177 if (opt != IPV6_IPSEC_POLICY) { 3178 *dir = -EOPNOTSUPP; 3179 return NULL; 3180 } 3181 break; 3182 #endif 3183 default: 3184 *dir = -EINVAL; 3185 return NULL; 3186 } 3187 3188 *dir = -EINVAL; 3189 3190 if (len < sizeof(struct sadb_x_policy) || 3191 pol->sadb_x_policy_len*8 > len || 3192 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3193 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3194 return NULL; 3195 3196 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3197 if (xp == NULL) { 3198 *dir = -ENOBUFS; 3199 return NULL; 3200 } 3201 3202 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3203 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3204 3205 xp->lft.soft_byte_limit = XFRM_INF; 3206 xp->lft.hard_byte_limit = XFRM_INF; 3207 xp->lft.soft_packet_limit = XFRM_INF; 3208 xp->lft.hard_packet_limit = XFRM_INF; 3209 xp->family = sk->sk_family; 3210 3211 xp->xfrm_nr = 0; 3212 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3213 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3214 goto out; 3215 3216 /* security context too */ 3217 if (len >= (pol->sadb_x_policy_len*8 + 3218 sizeof(struct sadb_x_sec_ctx))) { 3219 char *p = (char *)pol; 3220 struct xfrm_user_sec_ctx *uctx; 3221 3222 p += pol->sadb_x_policy_len*8; 3223 sec_ctx = (struct sadb_x_sec_ctx *)p; 3224 if (len < pol->sadb_x_policy_len*8 + 3225 sec_ctx->sadb_x_sec_len) { 3226 *dir = -EINVAL; 3227 goto out; 3228 } 3229 if ((*dir = verify_sec_ctx_len(p))) 3230 goto out; 3231 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3232 *dir = security_xfrm_policy_alloc(&xp->security, uctx); 3233 kfree(uctx); 3234 3235 if (*dir) 3236 goto out; 3237 } 3238 3239 *dir = pol->sadb_x_policy_dir-1; 3240 return xp; 3241 3242 out: 3243 xp->walk.dead = 1; 3244 xfrm_policy_destroy(xp); 3245 return NULL; 3246 } 3247 3248 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3249 { 3250 struct sk_buff *skb; 3251 struct sadb_msg *hdr; 3252 struct sadb_sa *sa; 3253 struct sadb_address *addr; 3254 struct sadb_x_nat_t_port *n_port; 3255 int sockaddr_size; 3256 int size; 3257 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3258 struct xfrm_encap_tmpl *natt = NULL; 3259 3260 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3261 if (!sockaddr_size) 3262 return -EINVAL; 3263 3264 if (!satype) 3265 return -EINVAL; 3266 3267 if (!x->encap) 3268 return -EINVAL; 3269 3270 natt = x->encap; 3271 3272 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3273 * 3274 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3275 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3276 */ 3277 3278 size = sizeof(struct sadb_msg) + 3279 sizeof(struct sadb_sa) + 3280 (sizeof(struct sadb_address) * 2) + 3281 (sockaddr_size * 2) + 3282 (sizeof(struct sadb_x_nat_t_port) * 2); 3283 3284 skb = alloc_skb(size + 16, GFP_ATOMIC); 3285 if (skb == NULL) 3286 return -ENOMEM; 3287 3288 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3289 hdr->sadb_msg_version = PF_KEY_V2; 3290 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3291 hdr->sadb_msg_satype = satype; 3292 hdr->sadb_msg_len = size / sizeof(uint64_t); 3293 hdr->sadb_msg_errno = 0; 3294 hdr->sadb_msg_reserved = 0; 3295 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3296 hdr->sadb_msg_pid = 0; 3297 3298 /* SA */ 3299 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3300 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3301 sa->sadb_sa_exttype = SADB_EXT_SA; 3302 sa->sadb_sa_spi = x->id.spi; 3303 sa->sadb_sa_replay = 0; 3304 sa->sadb_sa_state = 0; 3305 sa->sadb_sa_auth = 0; 3306 sa->sadb_sa_encrypt = 0; 3307 sa->sadb_sa_flags = 0; 3308 3309 /* ADDRESS_SRC (old addr) */ 3310 addr = (struct sadb_address*) 3311 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3312 addr->sadb_address_len = 3313 (sizeof(struct sadb_address)+sockaddr_size)/ 3314 sizeof(uint64_t); 3315 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3316 addr->sadb_address_proto = 0; 3317 addr->sadb_address_reserved = 0; 3318 addr->sadb_address_prefixlen = 3319 pfkey_sockaddr_fill(&x->props.saddr, 0, 3320 (struct sockaddr *) (addr + 1), 3321 x->props.family); 3322 if (!addr->sadb_address_prefixlen) 3323 BUG(); 3324 3325 /* NAT_T_SPORT (old port) */ 3326 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3327 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3328 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3329 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3330 n_port->sadb_x_nat_t_port_reserved = 0; 3331 3332 /* ADDRESS_DST (new addr) */ 3333 addr = (struct sadb_address*) 3334 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3335 addr->sadb_address_len = 3336 (sizeof(struct sadb_address)+sockaddr_size)/ 3337 sizeof(uint64_t); 3338 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3339 addr->sadb_address_proto = 0; 3340 addr->sadb_address_reserved = 0; 3341 addr->sadb_address_prefixlen = 3342 pfkey_sockaddr_fill(ipaddr, 0, 3343 (struct sockaddr *) (addr + 1), 3344 x->props.family); 3345 if (!addr->sadb_address_prefixlen) 3346 BUG(); 3347 3348 /* NAT_T_DPORT (new port) */ 3349 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3350 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3351 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3352 n_port->sadb_x_nat_t_port_port = sport; 3353 n_port->sadb_x_nat_t_port_reserved = 0; 3354 3355 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3356 } 3357 3358 #ifdef CONFIG_NET_KEY_MIGRATE 3359 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3360 const struct xfrm_selector *sel) 3361 { 3362 struct sadb_address *addr; 3363 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3364 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3365 addr->sadb_address_exttype = type; 3366 addr->sadb_address_proto = sel->proto; 3367 addr->sadb_address_reserved = 0; 3368 3369 switch (type) { 3370 case SADB_EXT_ADDRESS_SRC: 3371 addr->sadb_address_prefixlen = sel->prefixlen_s; 3372 pfkey_sockaddr_fill(&sel->saddr, 0, 3373 (struct sockaddr *)(addr + 1), 3374 sel->family); 3375 break; 3376 case SADB_EXT_ADDRESS_DST: 3377 addr->sadb_address_prefixlen = sel->prefixlen_d; 3378 pfkey_sockaddr_fill(&sel->daddr, 0, 3379 (struct sockaddr *)(addr + 1), 3380 sel->family); 3381 break; 3382 default: 3383 return -EINVAL; 3384 } 3385 3386 return 0; 3387 } 3388 3389 3390 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3391 { 3392 struct sadb_x_kmaddress *kma; 3393 u8 *sa; 3394 int family = k->family; 3395 int socklen = pfkey_sockaddr_len(family); 3396 int size_req; 3397 3398 size_req = (sizeof(struct sadb_x_kmaddress) + 3399 pfkey_sockaddr_pair_size(family)); 3400 3401 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3402 memset(kma, 0, size_req); 3403 kma->sadb_x_kmaddress_len = size_req / 8; 3404 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3405 kma->sadb_x_kmaddress_reserved = k->reserved; 3406 3407 sa = (u8 *)(kma + 1); 3408 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3409 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3410 return -EINVAL; 3411 3412 return 0; 3413 } 3414 3415 static int set_ipsecrequest(struct sk_buff *skb, 3416 uint8_t proto, uint8_t mode, int level, 3417 uint32_t reqid, uint8_t family, 3418 const xfrm_address_t *src, const xfrm_address_t *dst) 3419 { 3420 struct sadb_x_ipsecrequest *rq; 3421 u8 *sa; 3422 int socklen = pfkey_sockaddr_len(family); 3423 int size_req; 3424 3425 size_req = sizeof(struct sadb_x_ipsecrequest) + 3426 pfkey_sockaddr_pair_size(family); 3427 3428 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3429 memset(rq, 0, size_req); 3430 rq->sadb_x_ipsecrequest_len = size_req; 3431 rq->sadb_x_ipsecrequest_proto = proto; 3432 rq->sadb_x_ipsecrequest_mode = mode; 3433 rq->sadb_x_ipsecrequest_level = level; 3434 rq->sadb_x_ipsecrequest_reqid = reqid; 3435 3436 sa = (u8 *) (rq + 1); 3437 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3438 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3439 return -EINVAL; 3440 3441 return 0; 3442 } 3443 #endif 3444 3445 #ifdef CONFIG_NET_KEY_MIGRATE 3446 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3447 const struct xfrm_migrate *m, int num_bundles, 3448 const struct xfrm_kmaddress *k) 3449 { 3450 int i; 3451 int sasize_sel; 3452 int size = 0; 3453 int size_pol = 0; 3454 struct sk_buff *skb; 3455 struct sadb_msg *hdr; 3456 struct sadb_x_policy *pol; 3457 const struct xfrm_migrate *mp; 3458 3459 if (type != XFRM_POLICY_TYPE_MAIN) 3460 return 0; 3461 3462 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3463 return -EINVAL; 3464 3465 if (k != NULL) { 3466 /* addresses for KM */ 3467 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3468 pfkey_sockaddr_pair_size(k->family)); 3469 } 3470 3471 /* selector */ 3472 sasize_sel = pfkey_sockaddr_size(sel->family); 3473 if (!sasize_sel) 3474 return -EINVAL; 3475 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3476 3477 /* policy info */ 3478 size_pol += sizeof(struct sadb_x_policy); 3479 3480 /* ipsecrequests */ 3481 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3482 /* old locator pair */ 3483 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3484 pfkey_sockaddr_pair_size(mp->old_family); 3485 /* new locator pair */ 3486 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3487 pfkey_sockaddr_pair_size(mp->new_family); 3488 } 3489 3490 size += sizeof(struct sadb_msg) + size_pol; 3491 3492 /* alloc buffer */ 3493 skb = alloc_skb(size, GFP_ATOMIC); 3494 if (skb == NULL) 3495 return -ENOMEM; 3496 3497 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3498 hdr->sadb_msg_version = PF_KEY_V2; 3499 hdr->sadb_msg_type = SADB_X_MIGRATE; 3500 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3501 hdr->sadb_msg_len = size / 8; 3502 hdr->sadb_msg_errno = 0; 3503 hdr->sadb_msg_reserved = 0; 3504 hdr->sadb_msg_seq = 0; 3505 hdr->sadb_msg_pid = 0; 3506 3507 /* Addresses to be used by KM for negotiation, if ext is available */ 3508 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3509 goto err; 3510 3511 /* selector src */ 3512 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3513 3514 /* selector dst */ 3515 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3516 3517 /* policy information */ 3518 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3519 pol->sadb_x_policy_len = size_pol / 8; 3520 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3521 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3522 pol->sadb_x_policy_dir = dir + 1; 3523 pol->sadb_x_policy_reserved = 0; 3524 pol->sadb_x_policy_id = 0; 3525 pol->sadb_x_policy_priority = 0; 3526 3527 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3528 /* old ipsecrequest */ 3529 int mode = pfkey_mode_from_xfrm(mp->mode); 3530 if (mode < 0) 3531 goto err; 3532 if (set_ipsecrequest(skb, mp->proto, mode, 3533 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3534 mp->reqid, mp->old_family, 3535 &mp->old_saddr, &mp->old_daddr) < 0) 3536 goto err; 3537 3538 /* new ipsecrequest */ 3539 if (set_ipsecrequest(skb, mp->proto, mode, 3540 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3541 mp->reqid, mp->new_family, 3542 &mp->new_saddr, &mp->new_daddr) < 0) 3543 goto err; 3544 } 3545 3546 /* broadcast migrate message to sockets */ 3547 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3548 3549 return 0; 3550 3551 err: 3552 kfree_skb(skb); 3553 return -EINVAL; 3554 } 3555 #else 3556 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3557 const struct xfrm_migrate *m, int num_bundles, 3558 const struct xfrm_kmaddress *k) 3559 { 3560 return -ENOPROTOOPT; 3561 } 3562 #endif 3563 3564 static int pfkey_sendmsg(struct kiocb *kiocb, 3565 struct socket *sock, struct msghdr *msg, size_t len) 3566 { 3567 struct sock *sk = sock->sk; 3568 struct sk_buff *skb = NULL; 3569 struct sadb_msg *hdr = NULL; 3570 int err; 3571 3572 err = -EOPNOTSUPP; 3573 if (msg->msg_flags & MSG_OOB) 3574 goto out; 3575 3576 err = -EMSGSIZE; 3577 if ((unsigned int)len > sk->sk_sndbuf - 32) 3578 goto out; 3579 3580 err = -ENOBUFS; 3581 skb = alloc_skb(len, GFP_KERNEL); 3582 if (skb == NULL) 3583 goto out; 3584 3585 err = -EFAULT; 3586 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3587 goto out; 3588 3589 hdr = pfkey_get_base_msg(skb, &err); 3590 if (!hdr) 3591 goto out; 3592 3593 mutex_lock(&xfrm_cfg_mutex); 3594 err = pfkey_process(sk, skb, hdr); 3595 mutex_unlock(&xfrm_cfg_mutex); 3596 3597 out: 3598 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3599 err = 0; 3600 kfree_skb(skb); 3601 3602 return err ? : len; 3603 } 3604 3605 static int pfkey_recvmsg(struct kiocb *kiocb, 3606 struct socket *sock, struct msghdr *msg, size_t len, 3607 int flags) 3608 { 3609 struct sock *sk = sock->sk; 3610 struct pfkey_sock *pfk = pfkey_sk(sk); 3611 struct sk_buff *skb; 3612 int copied, err; 3613 3614 err = -EINVAL; 3615 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3616 goto out; 3617 3618 msg->msg_namelen = 0; 3619 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3620 if (skb == NULL) 3621 goto out; 3622 3623 copied = skb->len; 3624 if (copied > len) { 3625 msg->msg_flags |= MSG_TRUNC; 3626 copied = len; 3627 } 3628 3629 skb_reset_transport_header(skb); 3630 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3631 if (err) 3632 goto out_free; 3633 3634 sock_recv_ts_and_drops(msg, sk, skb); 3635 3636 err = (flags & MSG_TRUNC) ? skb->len : copied; 3637 3638 if (pfk->dump.dump != NULL && 3639 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3640 pfkey_do_dump(pfk); 3641 3642 out_free: 3643 skb_free_datagram(sk, skb); 3644 out: 3645 return err; 3646 } 3647 3648 static const struct proto_ops pfkey_ops = { 3649 .family = PF_KEY, 3650 .owner = THIS_MODULE, 3651 /* Operations that make no sense on pfkey sockets. */ 3652 .bind = sock_no_bind, 3653 .connect = sock_no_connect, 3654 .socketpair = sock_no_socketpair, 3655 .accept = sock_no_accept, 3656 .getname = sock_no_getname, 3657 .ioctl = sock_no_ioctl, 3658 .listen = sock_no_listen, 3659 .shutdown = sock_no_shutdown, 3660 .setsockopt = sock_no_setsockopt, 3661 .getsockopt = sock_no_getsockopt, 3662 .mmap = sock_no_mmap, 3663 .sendpage = sock_no_sendpage, 3664 3665 /* Now the operations that really occur. */ 3666 .release = pfkey_release, 3667 .poll = datagram_poll, 3668 .sendmsg = pfkey_sendmsg, 3669 .recvmsg = pfkey_recvmsg, 3670 }; 3671 3672 static const struct net_proto_family pfkey_family_ops = { 3673 .family = PF_KEY, 3674 .create = pfkey_create, 3675 .owner = THIS_MODULE, 3676 }; 3677 3678 #ifdef CONFIG_PROC_FS 3679 static int pfkey_seq_show(struct seq_file *f, void *v) 3680 { 3681 struct sock *s = sk_entry(v); 3682 3683 if (v == SEQ_START_TOKEN) 3684 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3685 else 3686 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3687 s, 3688 atomic_read(&s->sk_refcnt), 3689 sk_rmem_alloc_get(s), 3690 sk_wmem_alloc_get(s), 3691 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3692 sock_i_ino(s) 3693 ); 3694 return 0; 3695 } 3696 3697 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3698 __acquires(rcu) 3699 { 3700 struct net *net = seq_file_net(f); 3701 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3702 3703 rcu_read_lock(); 3704 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3705 } 3706 3707 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3708 { 3709 struct net *net = seq_file_net(f); 3710 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3711 3712 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3713 } 3714 3715 static void pfkey_seq_stop(struct seq_file *f, void *v) 3716 __releases(rcu) 3717 { 3718 rcu_read_unlock(); 3719 } 3720 3721 static const struct seq_operations pfkey_seq_ops = { 3722 .start = pfkey_seq_start, 3723 .next = pfkey_seq_next, 3724 .stop = pfkey_seq_stop, 3725 .show = pfkey_seq_show, 3726 }; 3727 3728 static int pfkey_seq_open(struct inode *inode, struct file *file) 3729 { 3730 return seq_open_net(inode, file, &pfkey_seq_ops, 3731 sizeof(struct seq_net_private)); 3732 } 3733 3734 static const struct file_operations pfkey_proc_ops = { 3735 .open = pfkey_seq_open, 3736 .read = seq_read, 3737 .llseek = seq_lseek, 3738 .release = seq_release_net, 3739 }; 3740 3741 static int __net_init pfkey_init_proc(struct net *net) 3742 { 3743 struct proc_dir_entry *e; 3744 3745 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3746 if (e == NULL) 3747 return -ENOMEM; 3748 3749 return 0; 3750 } 3751 3752 static void __net_exit pfkey_exit_proc(struct net *net) 3753 { 3754 remove_proc_entry("pfkey", net->proc_net); 3755 } 3756 #else 3757 static inline int pfkey_init_proc(struct net *net) 3758 { 3759 return 0; 3760 } 3761 3762 static inline void pfkey_exit_proc(struct net *net) 3763 { 3764 } 3765 #endif 3766 3767 static struct xfrm_mgr pfkeyv2_mgr = 3768 { 3769 .id = "pfkeyv2", 3770 .notify = pfkey_send_notify, 3771 .acquire = pfkey_send_acquire, 3772 .compile_policy = pfkey_compile_policy, 3773 .new_mapping = pfkey_send_new_mapping, 3774 .notify_policy = pfkey_send_policy_notify, 3775 .migrate = pfkey_send_migrate, 3776 }; 3777 3778 static int __net_init pfkey_net_init(struct net *net) 3779 { 3780 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3781 int rv; 3782 3783 INIT_HLIST_HEAD(&net_pfkey->table); 3784 atomic_set(&net_pfkey->socks_nr, 0); 3785 3786 rv = pfkey_init_proc(net); 3787 3788 return rv; 3789 } 3790 3791 static void __net_exit pfkey_net_exit(struct net *net) 3792 { 3793 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3794 3795 pfkey_exit_proc(net); 3796 BUG_ON(!hlist_empty(&net_pfkey->table)); 3797 } 3798 3799 static struct pernet_operations pfkey_net_ops = { 3800 .init = pfkey_net_init, 3801 .exit = pfkey_net_exit, 3802 .id = &pfkey_net_id, 3803 .size = sizeof(struct netns_pfkey), 3804 }; 3805 3806 static void __exit ipsec_pfkey_exit(void) 3807 { 3808 xfrm_unregister_km(&pfkeyv2_mgr); 3809 sock_unregister(PF_KEY); 3810 unregister_pernet_subsys(&pfkey_net_ops); 3811 proto_unregister(&key_proto); 3812 } 3813 3814 static int __init ipsec_pfkey_init(void) 3815 { 3816 int err = proto_register(&key_proto, 0); 3817 3818 if (err != 0) 3819 goto out; 3820 3821 err = register_pernet_subsys(&pfkey_net_ops); 3822 if (err != 0) 3823 goto out_unregister_key_proto; 3824 err = sock_register(&pfkey_family_ops); 3825 if (err != 0) 3826 goto out_unregister_pernet; 3827 err = xfrm_register_km(&pfkeyv2_mgr); 3828 if (err != 0) 3829 goto out_sock_unregister; 3830 out: 3831 return err; 3832 3833 out_sock_unregister: 3834 sock_unregister(PF_KEY); 3835 out_unregister_pernet: 3836 unregister_pernet_subsys(&pfkey_net_ops); 3837 out_unregister_key_proto: 3838 proto_unregister(&key_proto); 3839 goto out; 3840 } 3841 3842 module_init(ipsec_pfkey_init); 3843 module_exit(ipsec_pfkey_exit); 3844 MODULE_LICENSE("GPL"); 3845 MODULE_ALIAS_NETPROTO(PF_KEY); 3846