1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <net/net_namespace.h> 31 #include <net/netns/generic.h> 32 #include <net/xfrm.h> 33 34 #include <net/sock.h> 35 36 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 37 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 38 39 static int pfkey_net_id __read_mostly; 40 struct netns_pfkey { 41 /* List of all pfkey sockets. */ 42 struct hlist_head table; 43 atomic_t socks_nr; 44 }; 45 static DEFINE_MUTEX(pfkey_mutex); 46 47 #define DUMMY_MARK 0 48 static struct xfrm_mark dummy_mark = {0, 0}; 49 struct pfkey_sock { 50 /* struct sock must be the first member of struct pfkey_sock */ 51 struct sock sk; 52 int registered; 53 int promisc; 54 55 struct { 56 uint8_t msg_version; 57 uint32_t msg_portid; 58 int (*dump)(struct pfkey_sock *sk); 59 void (*done)(struct pfkey_sock *sk); 60 union { 61 struct xfrm_policy_walk policy; 62 struct xfrm_state_walk state; 63 } u; 64 struct sk_buff *skb; 65 } dump; 66 }; 67 68 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 69 { 70 return (struct pfkey_sock *)sk; 71 } 72 73 static int pfkey_can_dump(const struct sock *sk) 74 { 75 if (3 * atomic_read(&sk->sk_rmem_alloc) <= 2 * sk->sk_rcvbuf) 76 return 1; 77 return 0; 78 } 79 80 static void pfkey_terminate_dump(struct pfkey_sock *pfk) 81 { 82 if (pfk->dump.dump) { 83 if (pfk->dump.skb) { 84 kfree_skb(pfk->dump.skb); 85 pfk->dump.skb = NULL; 86 } 87 pfk->dump.done(pfk); 88 pfk->dump.dump = NULL; 89 pfk->dump.done = NULL; 90 } 91 } 92 93 static void pfkey_sock_destruct(struct sock *sk) 94 { 95 struct net *net = sock_net(sk); 96 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 97 98 pfkey_terminate_dump(pfkey_sk(sk)); 99 skb_queue_purge(&sk->sk_receive_queue); 100 101 if (!sock_flag(sk, SOCK_DEAD)) { 102 pr_err("Attempt to release alive pfkey socket: %p\n", sk); 103 return; 104 } 105 106 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 107 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 108 109 atomic_dec(&net_pfkey->socks_nr); 110 } 111 112 static const struct proto_ops pfkey_ops; 113 114 static void pfkey_insert(struct sock *sk) 115 { 116 struct net *net = sock_net(sk); 117 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 118 119 mutex_lock(&pfkey_mutex); 120 sk_add_node_rcu(sk, &net_pfkey->table); 121 mutex_unlock(&pfkey_mutex); 122 } 123 124 static void pfkey_remove(struct sock *sk) 125 { 126 mutex_lock(&pfkey_mutex); 127 sk_del_node_init_rcu(sk); 128 mutex_unlock(&pfkey_mutex); 129 } 130 131 static struct proto key_proto = { 132 .name = "KEY", 133 .owner = THIS_MODULE, 134 .obj_size = sizeof(struct pfkey_sock), 135 }; 136 137 static int pfkey_create(struct net *net, struct socket *sock, int protocol, 138 int kern) 139 { 140 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 141 struct sock *sk; 142 int err; 143 144 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 145 return -EPERM; 146 if (sock->type != SOCK_RAW) 147 return -ESOCKTNOSUPPORT; 148 if (protocol != PF_KEY_V2) 149 return -EPROTONOSUPPORT; 150 151 err = -ENOMEM; 152 sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto); 153 if (sk == NULL) 154 goto out; 155 156 sock->ops = &pfkey_ops; 157 sock_init_data(sock, sk); 158 159 sk->sk_family = PF_KEY; 160 sk->sk_destruct = pfkey_sock_destruct; 161 162 atomic_inc(&net_pfkey->socks_nr); 163 164 pfkey_insert(sk); 165 166 return 0; 167 out: 168 return err; 169 } 170 171 static int pfkey_release(struct socket *sock) 172 { 173 struct sock *sk = sock->sk; 174 175 if (!sk) 176 return 0; 177 178 pfkey_remove(sk); 179 180 sock_orphan(sk); 181 sock->sk = NULL; 182 skb_queue_purge(&sk->sk_write_queue); 183 184 synchronize_rcu(); 185 sock_put(sk); 186 187 return 0; 188 } 189 190 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 191 gfp_t allocation, struct sock *sk) 192 { 193 int err = -ENOBUFS; 194 195 sock_hold(sk); 196 if (*skb2 == NULL) { 197 if (atomic_read(&skb->users) != 1) { 198 *skb2 = skb_clone(skb, allocation); 199 } else { 200 *skb2 = skb; 201 atomic_inc(&skb->users); 202 } 203 } 204 if (*skb2 != NULL) { 205 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 206 skb_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 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 if (!x->props.family) { 1200 err = -EAFNOSUPPORT; 1201 goto out; 1202 } 1203 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1204 &x->id.daddr); 1205 1206 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1207 const struct sadb_x_sa2 *sa2 = ext_hdrs[SADB_X_EXT_SA2-1]; 1208 int mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1209 if (mode < 0) { 1210 err = -EINVAL; 1211 goto out; 1212 } 1213 x->props.mode = mode; 1214 x->props.reqid = sa2->sadb_x_sa2_reqid; 1215 } 1216 1217 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1218 const struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1219 1220 /* Nobody uses this, but we try. */ 1221 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1222 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1223 } 1224 1225 if (!x->sel.family) 1226 x->sel.family = x->props.family; 1227 1228 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1229 const struct sadb_x_nat_t_type* n_type; 1230 struct xfrm_encap_tmpl *natt; 1231 1232 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1233 if (!x->encap) 1234 goto out; 1235 1236 natt = x->encap; 1237 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1238 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1239 1240 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1241 const struct sadb_x_nat_t_port *n_port = 1242 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1243 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1244 } 1245 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1246 const struct sadb_x_nat_t_port *n_port = 1247 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1248 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1249 } 1250 memset(&natt->encap_oa, 0, sizeof(natt->encap_oa)); 1251 } 1252 1253 err = xfrm_init_state(x); 1254 if (err) 1255 goto out; 1256 1257 x->km.seq = hdr->sadb_msg_seq; 1258 return x; 1259 1260 out: 1261 x->km.state = XFRM_STATE_DEAD; 1262 xfrm_state_put(x); 1263 return ERR_PTR(err); 1264 } 1265 1266 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1267 { 1268 return -EOPNOTSUPP; 1269 } 1270 1271 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1272 { 1273 struct net *net = sock_net(sk); 1274 struct sk_buff *resp_skb; 1275 struct sadb_x_sa2 *sa2; 1276 struct sadb_address *saddr, *daddr; 1277 struct sadb_msg *out_hdr; 1278 struct sadb_spirange *range; 1279 struct xfrm_state *x = NULL; 1280 int mode; 1281 int err; 1282 u32 min_spi, max_spi; 1283 u32 reqid; 1284 u8 proto; 1285 unsigned short family; 1286 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1287 1288 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1289 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1290 return -EINVAL; 1291 1292 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1293 if (proto == 0) 1294 return -EINVAL; 1295 1296 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1297 mode = pfkey_mode_to_xfrm(sa2->sadb_x_sa2_mode); 1298 if (mode < 0) 1299 return -EINVAL; 1300 reqid = sa2->sadb_x_sa2_reqid; 1301 } else { 1302 mode = 0; 1303 reqid = 0; 1304 } 1305 1306 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1307 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1308 1309 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1310 switch (family) { 1311 case AF_INET: 1312 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1313 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1314 break; 1315 #if IS_ENABLED(CONFIG_IPV6) 1316 case AF_INET6: 1317 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1318 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1319 break; 1320 #endif 1321 } 1322 1323 if (hdr->sadb_msg_seq) { 1324 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1325 if (x && !xfrm_addr_equal(&x->id.daddr, xdaddr, family)) { 1326 xfrm_state_put(x); 1327 x = NULL; 1328 } 1329 } 1330 1331 if (!x) 1332 x = xfrm_find_acq(net, &dummy_mark, mode, reqid, proto, xdaddr, xsaddr, 1, family); 1333 1334 if (x == NULL) 1335 return -ENOENT; 1336 1337 min_spi = 0x100; 1338 max_spi = 0x0fffffff; 1339 1340 range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1341 if (range) { 1342 min_spi = range->sadb_spirange_min; 1343 max_spi = range->sadb_spirange_max; 1344 } 1345 1346 err = xfrm_alloc_spi(x, min_spi, max_spi); 1347 resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x); 1348 1349 if (IS_ERR(resp_skb)) { 1350 xfrm_state_put(x); 1351 return PTR_ERR(resp_skb); 1352 } 1353 1354 out_hdr = (struct sadb_msg *) resp_skb->data; 1355 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1356 out_hdr->sadb_msg_type = SADB_GETSPI; 1357 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1358 out_hdr->sadb_msg_errno = 0; 1359 out_hdr->sadb_msg_reserved = 0; 1360 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1361 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1362 1363 xfrm_state_put(x); 1364 1365 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk, net); 1366 1367 return 0; 1368 } 1369 1370 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1371 { 1372 struct net *net = sock_net(sk); 1373 struct xfrm_state *x; 1374 1375 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1376 return -EOPNOTSUPP; 1377 1378 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1379 return 0; 1380 1381 x = xfrm_find_acq_byseq(net, DUMMY_MARK, hdr->sadb_msg_seq); 1382 if (x == NULL) 1383 return 0; 1384 1385 spin_lock_bh(&x->lock); 1386 if (x->km.state == XFRM_STATE_ACQ) { 1387 x->km.state = XFRM_STATE_ERROR; 1388 wake_up(&net->xfrm.km_waitq); 1389 } 1390 spin_unlock_bh(&x->lock); 1391 xfrm_state_put(x); 1392 return 0; 1393 } 1394 1395 static inline int event2poltype(int event) 1396 { 1397 switch (event) { 1398 case XFRM_MSG_DELPOLICY: 1399 return SADB_X_SPDDELETE; 1400 case XFRM_MSG_NEWPOLICY: 1401 return SADB_X_SPDADD; 1402 case XFRM_MSG_UPDPOLICY: 1403 return SADB_X_SPDUPDATE; 1404 case XFRM_MSG_POLEXPIRE: 1405 // return SADB_X_SPDEXPIRE; 1406 default: 1407 pr_err("pfkey: Unknown policy event %d\n", event); 1408 break; 1409 } 1410 1411 return 0; 1412 } 1413 1414 static inline int event2keytype(int event) 1415 { 1416 switch (event) { 1417 case XFRM_MSG_DELSA: 1418 return SADB_DELETE; 1419 case XFRM_MSG_NEWSA: 1420 return SADB_ADD; 1421 case XFRM_MSG_UPDSA: 1422 return SADB_UPDATE; 1423 case XFRM_MSG_EXPIRE: 1424 return SADB_EXPIRE; 1425 default: 1426 pr_err("pfkey: Unknown SA event %d\n", event); 1427 break; 1428 } 1429 1430 return 0; 1431 } 1432 1433 /* ADD/UPD/DEL */ 1434 static int key_notify_sa(struct xfrm_state *x, const struct km_event *c) 1435 { 1436 struct sk_buff *skb; 1437 struct sadb_msg *hdr; 1438 1439 skb = pfkey_xfrm_state2msg(x); 1440 1441 if (IS_ERR(skb)) 1442 return PTR_ERR(skb); 1443 1444 hdr = (struct sadb_msg *) skb->data; 1445 hdr->sadb_msg_version = PF_KEY_V2; 1446 hdr->sadb_msg_type = event2keytype(c->event); 1447 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1448 hdr->sadb_msg_errno = 0; 1449 hdr->sadb_msg_reserved = 0; 1450 hdr->sadb_msg_seq = c->seq; 1451 hdr->sadb_msg_pid = c->portid; 1452 1453 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xs_net(x)); 1454 1455 return 0; 1456 } 1457 1458 static int pfkey_add(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1459 { 1460 struct net *net = sock_net(sk); 1461 struct xfrm_state *x; 1462 int err; 1463 struct km_event c; 1464 1465 x = pfkey_msg2xfrm_state(net, hdr, ext_hdrs); 1466 if (IS_ERR(x)) 1467 return PTR_ERR(x); 1468 1469 xfrm_state_hold(x); 1470 if (hdr->sadb_msg_type == SADB_ADD) 1471 err = xfrm_state_add(x); 1472 else 1473 err = xfrm_state_update(x); 1474 1475 xfrm_audit_state_add(x, err ? 0 : 1, 1476 audit_get_loginuid(current), 1477 audit_get_sessionid(current), 0); 1478 1479 if (err < 0) { 1480 x->km.state = XFRM_STATE_DEAD; 1481 __xfrm_state_put(x); 1482 goto out; 1483 } 1484 1485 if (hdr->sadb_msg_type == SADB_ADD) 1486 c.event = XFRM_MSG_NEWSA; 1487 else 1488 c.event = XFRM_MSG_UPDSA; 1489 c.seq = hdr->sadb_msg_seq; 1490 c.portid = hdr->sadb_msg_pid; 1491 km_state_notify(x, &c); 1492 out: 1493 xfrm_state_put(x); 1494 return err; 1495 } 1496 1497 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1498 { 1499 struct net *net = sock_net(sk); 1500 struct xfrm_state *x; 1501 struct km_event c; 1502 int err; 1503 1504 if (!ext_hdrs[SADB_EXT_SA-1] || 1505 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1506 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1507 return -EINVAL; 1508 1509 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1510 if (x == NULL) 1511 return -ESRCH; 1512 1513 if ((err = security_xfrm_state_delete(x))) 1514 goto out; 1515 1516 if (xfrm_state_kern(x)) { 1517 err = -EPERM; 1518 goto out; 1519 } 1520 1521 err = xfrm_state_delete(x); 1522 1523 if (err < 0) 1524 goto out; 1525 1526 c.seq = hdr->sadb_msg_seq; 1527 c.portid = hdr->sadb_msg_pid; 1528 c.event = XFRM_MSG_DELSA; 1529 km_state_notify(x, &c); 1530 out: 1531 xfrm_audit_state_delete(x, err ? 0 : 1, 1532 audit_get_loginuid(current), 1533 audit_get_sessionid(current), 0); 1534 xfrm_state_put(x); 1535 1536 return err; 1537 } 1538 1539 static int pfkey_get(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1540 { 1541 struct net *net = sock_net(sk); 1542 __u8 proto; 1543 struct sk_buff *out_skb; 1544 struct sadb_msg *out_hdr; 1545 struct xfrm_state *x; 1546 1547 if (!ext_hdrs[SADB_EXT_SA-1] || 1548 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1549 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1550 return -EINVAL; 1551 1552 x = pfkey_xfrm_state_lookup(net, hdr, ext_hdrs); 1553 if (x == NULL) 1554 return -ESRCH; 1555 1556 out_skb = pfkey_xfrm_state2msg(x); 1557 proto = x->id.proto; 1558 xfrm_state_put(x); 1559 if (IS_ERR(out_skb)) 1560 return PTR_ERR(out_skb); 1561 1562 out_hdr = (struct sadb_msg *) out_skb->data; 1563 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1564 out_hdr->sadb_msg_type = SADB_GET; 1565 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1566 out_hdr->sadb_msg_errno = 0; 1567 out_hdr->sadb_msg_reserved = 0; 1568 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1569 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1570 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1571 1572 return 0; 1573 } 1574 1575 static struct sk_buff *compose_sadb_supported(const struct sadb_msg *orig, 1576 gfp_t allocation) 1577 { 1578 struct sk_buff *skb; 1579 struct sadb_msg *hdr; 1580 int len, auth_len, enc_len, i; 1581 1582 auth_len = xfrm_count_pfkey_auth_supported(); 1583 if (auth_len) { 1584 auth_len *= sizeof(struct sadb_alg); 1585 auth_len += sizeof(struct sadb_supported); 1586 } 1587 1588 enc_len = xfrm_count_pfkey_enc_supported(); 1589 if (enc_len) { 1590 enc_len *= sizeof(struct sadb_alg); 1591 enc_len += sizeof(struct sadb_supported); 1592 } 1593 1594 len = enc_len + auth_len + sizeof(struct sadb_msg); 1595 1596 skb = alloc_skb(len + 16, allocation); 1597 if (!skb) 1598 goto out_put_algs; 1599 1600 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1601 pfkey_hdr_dup(hdr, orig); 1602 hdr->sadb_msg_errno = 0; 1603 hdr->sadb_msg_len = len / sizeof(uint64_t); 1604 1605 if (auth_len) { 1606 struct sadb_supported *sp; 1607 struct sadb_alg *ap; 1608 1609 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1610 ap = (struct sadb_alg *) (sp + 1); 1611 1612 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1613 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1614 1615 for (i = 0; ; i++) { 1616 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1617 if (!aalg) 1618 break; 1619 if (!aalg->pfkey_supported) 1620 continue; 1621 if (aalg->available) 1622 *ap++ = aalg->desc; 1623 } 1624 } 1625 1626 if (enc_len) { 1627 struct sadb_supported *sp; 1628 struct sadb_alg *ap; 1629 1630 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1631 ap = (struct sadb_alg *) (sp + 1); 1632 1633 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1634 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1635 1636 for (i = 0; ; i++) { 1637 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1638 if (!ealg) 1639 break; 1640 if (!ealg->pfkey_supported) 1641 continue; 1642 if (ealg->available) 1643 *ap++ = ealg->desc; 1644 } 1645 } 1646 1647 out_put_algs: 1648 return skb; 1649 } 1650 1651 static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1652 { 1653 struct pfkey_sock *pfk = pfkey_sk(sk); 1654 struct sk_buff *supp_skb; 1655 1656 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1657 return -EINVAL; 1658 1659 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1660 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1661 return -EEXIST; 1662 pfk->registered |= (1<<hdr->sadb_msg_satype); 1663 } 1664 1665 xfrm_probe_algs(); 1666 1667 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1668 if (!supp_skb) { 1669 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1670 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1671 1672 return -ENOBUFS; 1673 } 1674 1675 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk, sock_net(sk)); 1676 1677 return 0; 1678 } 1679 1680 static int unicast_flush_resp(struct sock *sk, const struct sadb_msg *ihdr) 1681 { 1682 struct sk_buff *skb; 1683 struct sadb_msg *hdr; 1684 1685 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1686 if (!skb) 1687 return -ENOBUFS; 1688 1689 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1690 memcpy(hdr, ihdr, sizeof(struct sadb_msg)); 1691 hdr->sadb_msg_errno = (uint8_t) 0; 1692 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1693 1694 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ONE, sk, sock_net(sk)); 1695 } 1696 1697 static int key_notify_sa_flush(const struct km_event *c) 1698 { 1699 struct sk_buff *skb; 1700 struct sadb_msg *hdr; 1701 1702 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1703 if (!skb) 1704 return -ENOBUFS; 1705 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1706 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1707 hdr->sadb_msg_type = SADB_FLUSH; 1708 hdr->sadb_msg_seq = c->seq; 1709 hdr->sadb_msg_pid = c->portid; 1710 hdr->sadb_msg_version = PF_KEY_V2; 1711 hdr->sadb_msg_errno = (uint8_t) 0; 1712 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1713 1714 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1715 1716 return 0; 1717 } 1718 1719 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1720 { 1721 struct net *net = sock_net(sk); 1722 unsigned int proto; 1723 struct km_event c; 1724 struct xfrm_audit audit_info; 1725 int err, err2; 1726 1727 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1728 if (proto == 0) 1729 return -EINVAL; 1730 1731 audit_info.loginuid = audit_get_loginuid(current); 1732 audit_info.sessionid = audit_get_sessionid(current); 1733 audit_info.secid = 0; 1734 err = xfrm_state_flush(net, proto, &audit_info); 1735 err2 = unicast_flush_resp(sk, hdr); 1736 if (err || err2) { 1737 if (err == -ESRCH) /* empty table - go quietly */ 1738 err = 0; 1739 return err ? err : err2; 1740 } 1741 1742 c.data.proto = proto; 1743 c.seq = hdr->sadb_msg_seq; 1744 c.portid = hdr->sadb_msg_pid; 1745 c.event = XFRM_MSG_FLUSHSA; 1746 c.net = net; 1747 km_state_notify(NULL, &c); 1748 1749 return 0; 1750 } 1751 1752 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1753 { 1754 struct pfkey_sock *pfk = ptr; 1755 struct sk_buff *out_skb; 1756 struct sadb_msg *out_hdr; 1757 1758 if (!pfkey_can_dump(&pfk->sk)) 1759 return -ENOBUFS; 1760 1761 out_skb = pfkey_xfrm_state2msg(x); 1762 if (IS_ERR(out_skb)) 1763 return PTR_ERR(out_skb); 1764 1765 out_hdr = (struct sadb_msg *) out_skb->data; 1766 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1767 out_hdr->sadb_msg_type = SADB_DUMP; 1768 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1769 out_hdr->sadb_msg_errno = 0; 1770 out_hdr->sadb_msg_reserved = 0; 1771 out_hdr->sadb_msg_seq = count + 1; 1772 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1773 1774 if (pfk->dump.skb) 1775 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1776 &pfk->sk, sock_net(&pfk->sk)); 1777 pfk->dump.skb = out_skb; 1778 1779 return 0; 1780 } 1781 1782 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1783 { 1784 struct net *net = sock_net(&pfk->sk); 1785 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1786 } 1787 1788 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1789 { 1790 xfrm_state_walk_done(&pfk->dump.u.state); 1791 } 1792 1793 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1794 { 1795 u8 proto; 1796 struct pfkey_sock *pfk = pfkey_sk(sk); 1797 1798 if (pfk->dump.dump != NULL) 1799 return -EBUSY; 1800 1801 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1802 if (proto == 0) 1803 return -EINVAL; 1804 1805 pfk->dump.msg_version = hdr->sadb_msg_version; 1806 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1807 pfk->dump.dump = pfkey_dump_sa; 1808 pfk->dump.done = pfkey_dump_sa_done; 1809 xfrm_state_walk_init(&pfk->dump.u.state, proto); 1810 1811 return pfkey_do_dump(pfk); 1812 } 1813 1814 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1815 { 1816 struct pfkey_sock *pfk = pfkey_sk(sk); 1817 int satype = hdr->sadb_msg_satype; 1818 bool reset_errno = false; 1819 1820 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1821 reset_errno = true; 1822 if (satype != 0 && satype != 1) 1823 return -EINVAL; 1824 pfk->promisc = satype; 1825 } 1826 if (reset_errno && skb_cloned(skb)) 1827 skb = skb_copy(skb, GFP_KERNEL); 1828 else 1829 skb = skb_clone(skb, GFP_KERNEL); 1830 1831 if (reset_errno && skb) { 1832 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1833 new_hdr->sadb_msg_errno = 0; 1834 } 1835 1836 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1837 return 0; 1838 } 1839 1840 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1841 { 1842 int i; 1843 u32 reqid = *(u32*)ptr; 1844 1845 for (i=0; i<xp->xfrm_nr; i++) { 1846 if (xp->xfrm_vec[i].reqid == reqid) 1847 return -EEXIST; 1848 } 1849 return 0; 1850 } 1851 1852 static u32 gen_reqid(struct net *net) 1853 { 1854 struct xfrm_policy_walk walk; 1855 u32 start; 1856 int rc; 1857 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1858 1859 start = reqid; 1860 do { 1861 ++reqid; 1862 if (reqid == 0) 1863 reqid = IPSEC_MANUAL_REQID_MAX+1; 1864 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1865 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1866 xfrm_policy_walk_done(&walk); 1867 if (rc != -EEXIST) 1868 return reqid; 1869 } while (reqid != start); 1870 return 0; 1871 } 1872 1873 static int 1874 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1875 { 1876 struct net *net = xp_net(xp); 1877 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1878 int mode; 1879 1880 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1881 return -ELOOP; 1882 1883 if (rq->sadb_x_ipsecrequest_mode == 0) 1884 return -EINVAL; 1885 1886 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1887 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1888 return -EINVAL; 1889 t->mode = mode; 1890 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1891 t->optional = 1; 1892 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1893 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1894 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1895 t->reqid = 0; 1896 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1897 return -ENOBUFS; 1898 } 1899 1900 /* addresses present only in tunnel mode */ 1901 if (t->mode == XFRM_MODE_TUNNEL) { 1902 u8 *sa = (u8 *) (rq + 1); 1903 int family, socklen; 1904 1905 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1906 &t->saddr); 1907 if (!family) 1908 return -EINVAL; 1909 1910 socklen = pfkey_sockaddr_len(family); 1911 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1912 &t->id.daddr) != family) 1913 return -EINVAL; 1914 t->encap_family = family; 1915 } else 1916 t->encap_family = xp->family; 1917 1918 /* No way to set this via kame pfkey */ 1919 t->allalgs = 1; 1920 xp->xfrm_nr++; 1921 return 0; 1922 } 1923 1924 static int 1925 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1926 { 1927 int err; 1928 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1929 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1930 1931 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1932 return -EINVAL; 1933 1934 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1935 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1936 return err; 1937 len -= rq->sadb_x_ipsecrequest_len; 1938 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1939 } 1940 return 0; 1941 } 1942 1943 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1944 { 1945 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1946 1947 if (xfrm_ctx) { 1948 int len = sizeof(struct sadb_x_sec_ctx); 1949 len += xfrm_ctx->ctx_len; 1950 return PFKEY_ALIGN8(len); 1951 } 1952 return 0; 1953 } 1954 1955 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 1956 { 1957 const struct xfrm_tmpl *t; 1958 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1959 int socklen = 0; 1960 int i; 1961 1962 for (i=0; i<xp->xfrm_nr; i++) { 1963 t = xp->xfrm_vec + i; 1964 socklen += pfkey_sockaddr_len(t->encap_family); 1965 } 1966 1967 return sizeof(struct sadb_msg) + 1968 (sizeof(struct sadb_lifetime) * 3) + 1969 (sizeof(struct sadb_address) * 2) + 1970 (sockaddr_size * 2) + 1971 sizeof(struct sadb_x_policy) + 1972 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1973 (socklen * 2) + 1974 pfkey_xfrm_policy2sec_ctx_size(xp); 1975 } 1976 1977 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 1978 { 1979 struct sk_buff *skb; 1980 int size; 1981 1982 size = pfkey_xfrm_policy2msg_size(xp); 1983 1984 skb = alloc_skb(size + 16, GFP_ATOMIC); 1985 if (skb == NULL) 1986 return ERR_PTR(-ENOBUFS); 1987 1988 return skb; 1989 } 1990 1991 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 1992 { 1993 struct sadb_msg *hdr; 1994 struct sadb_address *addr; 1995 struct sadb_lifetime *lifetime; 1996 struct sadb_x_policy *pol; 1997 struct sadb_x_sec_ctx *sec_ctx; 1998 struct xfrm_sec_ctx *xfrm_ctx; 1999 int i; 2000 int size; 2001 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2002 int socklen = pfkey_sockaddr_len(xp->family); 2003 2004 size = pfkey_xfrm_policy2msg_size(xp); 2005 2006 /* call should fill header later */ 2007 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2008 memset(hdr, 0, size); /* XXX do we need this ? */ 2009 2010 /* src address */ 2011 addr = (struct sadb_address*) skb_put(skb, 2012 sizeof(struct sadb_address)+sockaddr_size); 2013 addr->sadb_address_len = 2014 (sizeof(struct sadb_address)+sockaddr_size)/ 2015 sizeof(uint64_t); 2016 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2017 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2018 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2019 addr->sadb_address_reserved = 0; 2020 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2021 xp->selector.sport, 2022 (struct sockaddr *) (addr + 1), 2023 xp->family)) 2024 BUG(); 2025 2026 /* dst address */ 2027 addr = (struct sadb_address*) skb_put(skb, 2028 sizeof(struct sadb_address)+sockaddr_size); 2029 addr->sadb_address_len = 2030 (sizeof(struct sadb_address)+sockaddr_size)/ 2031 sizeof(uint64_t); 2032 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2033 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2034 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2035 addr->sadb_address_reserved = 0; 2036 2037 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2038 (struct sockaddr *) (addr + 1), 2039 xp->family); 2040 2041 /* hard time */ 2042 lifetime = (struct sadb_lifetime *) skb_put(skb, 2043 sizeof(struct sadb_lifetime)); 2044 lifetime->sadb_lifetime_len = 2045 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2046 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2047 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2048 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2049 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2050 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2051 /* soft time */ 2052 lifetime = (struct sadb_lifetime *) skb_put(skb, 2053 sizeof(struct sadb_lifetime)); 2054 lifetime->sadb_lifetime_len = 2055 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2056 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2057 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2058 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2059 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2060 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2061 /* current time */ 2062 lifetime = (struct sadb_lifetime *) skb_put(skb, 2063 sizeof(struct sadb_lifetime)); 2064 lifetime->sadb_lifetime_len = 2065 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2066 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2067 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2068 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2069 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2070 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2071 2072 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2073 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2074 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2075 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2076 if (xp->action == XFRM_POLICY_ALLOW) { 2077 if (xp->xfrm_nr) 2078 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2079 else 2080 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2081 } 2082 pol->sadb_x_policy_dir = dir+1; 2083 pol->sadb_x_policy_id = xp->index; 2084 pol->sadb_x_policy_priority = xp->priority; 2085 2086 for (i=0; i<xp->xfrm_nr; i++) { 2087 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2088 struct sadb_x_ipsecrequest *rq; 2089 int req_size; 2090 int mode; 2091 2092 req_size = sizeof(struct sadb_x_ipsecrequest); 2093 if (t->mode == XFRM_MODE_TUNNEL) { 2094 socklen = pfkey_sockaddr_len(t->encap_family); 2095 req_size += socklen * 2; 2096 } else { 2097 size -= 2*socklen; 2098 } 2099 rq = (void*)skb_put(skb, req_size); 2100 pol->sadb_x_policy_len += req_size/8; 2101 memset(rq, 0, sizeof(*rq)); 2102 rq->sadb_x_ipsecrequest_len = req_size; 2103 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2104 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2105 return -EINVAL; 2106 rq->sadb_x_ipsecrequest_mode = mode; 2107 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2108 if (t->reqid) 2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2110 if (t->optional) 2111 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2112 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2113 2114 if (t->mode == XFRM_MODE_TUNNEL) { 2115 u8 *sa = (void *)(rq + 1); 2116 pfkey_sockaddr_fill(&t->saddr, 0, 2117 (struct sockaddr *)sa, 2118 t->encap_family); 2119 pfkey_sockaddr_fill(&t->id.daddr, 0, 2120 (struct sockaddr *) (sa + socklen), 2121 t->encap_family); 2122 } 2123 } 2124 2125 /* security context */ 2126 if ((xfrm_ctx = xp->security)) { 2127 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2128 2129 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2130 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2131 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2132 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2133 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2134 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2135 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2136 xfrm_ctx->ctx_len); 2137 } 2138 2139 hdr->sadb_msg_len = size / sizeof(uint64_t); 2140 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2141 2142 return 0; 2143 } 2144 2145 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2146 { 2147 struct sk_buff *out_skb; 2148 struct sadb_msg *out_hdr; 2149 int err; 2150 2151 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2152 if (IS_ERR(out_skb)) 2153 return PTR_ERR(out_skb); 2154 2155 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2156 if (err < 0) 2157 return err; 2158 2159 out_hdr = (struct sadb_msg *) out_skb->data; 2160 out_hdr->sadb_msg_version = PF_KEY_V2; 2161 2162 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2163 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2164 else 2165 out_hdr->sadb_msg_type = event2poltype(c->event); 2166 out_hdr->sadb_msg_errno = 0; 2167 out_hdr->sadb_msg_seq = c->seq; 2168 out_hdr->sadb_msg_pid = c->portid; 2169 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2170 return 0; 2171 2172 } 2173 2174 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2175 { 2176 struct net *net = sock_net(sk); 2177 int err = 0; 2178 struct sadb_lifetime *lifetime; 2179 struct sadb_address *sa; 2180 struct sadb_x_policy *pol; 2181 struct xfrm_policy *xp; 2182 struct km_event c; 2183 struct sadb_x_sec_ctx *sec_ctx; 2184 2185 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2186 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2187 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2188 return -EINVAL; 2189 2190 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2191 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2192 return -EINVAL; 2193 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2194 return -EINVAL; 2195 2196 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2197 if (xp == NULL) 2198 return -ENOBUFS; 2199 2200 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2201 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2202 xp->priority = pol->sadb_x_policy_priority; 2203 2204 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2205 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2206 if (!xp->family) { 2207 err = -EINVAL; 2208 goto out; 2209 } 2210 xp->selector.family = xp->family; 2211 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2212 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2213 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2214 if (xp->selector.sport) 2215 xp->selector.sport_mask = htons(0xffff); 2216 2217 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2218 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2219 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2220 2221 /* Amusing, we set this twice. KAME apps appear to set same value 2222 * in both addresses. 2223 */ 2224 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2225 2226 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2227 if (xp->selector.dport) 2228 xp->selector.dport_mask = htons(0xffff); 2229 2230 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2231 if (sec_ctx != NULL) { 2232 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2233 2234 if (!uctx) { 2235 err = -ENOBUFS; 2236 goto out; 2237 } 2238 2239 err = security_xfrm_policy_alloc(&xp->security, uctx); 2240 kfree(uctx); 2241 2242 if (err) 2243 goto out; 2244 } 2245 2246 xp->lft.soft_byte_limit = XFRM_INF; 2247 xp->lft.hard_byte_limit = XFRM_INF; 2248 xp->lft.soft_packet_limit = XFRM_INF; 2249 xp->lft.hard_packet_limit = XFRM_INF; 2250 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2251 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2252 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2253 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2254 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2255 } 2256 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2257 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2258 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2259 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2260 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2261 } 2262 xp->xfrm_nr = 0; 2263 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2264 (err = parse_ipsecrequests(xp, pol)) < 0) 2265 goto out; 2266 2267 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2268 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2269 2270 xfrm_audit_policy_add(xp, err ? 0 : 1, 2271 audit_get_loginuid(current), 2272 audit_get_sessionid(current), 0); 2273 2274 if (err) 2275 goto out; 2276 2277 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2278 c.event = XFRM_MSG_UPDPOLICY; 2279 else 2280 c.event = XFRM_MSG_NEWPOLICY; 2281 2282 c.seq = hdr->sadb_msg_seq; 2283 c.portid = hdr->sadb_msg_pid; 2284 2285 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2286 xfrm_pol_put(xp); 2287 return 0; 2288 2289 out: 2290 xp->walk.dead = 1; 2291 xfrm_policy_destroy(xp); 2292 return err; 2293 } 2294 2295 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2296 { 2297 struct net *net = sock_net(sk); 2298 int err; 2299 struct sadb_address *sa; 2300 struct sadb_x_policy *pol; 2301 struct xfrm_policy *xp; 2302 struct xfrm_selector sel; 2303 struct km_event c; 2304 struct sadb_x_sec_ctx *sec_ctx; 2305 struct xfrm_sec_ctx *pol_ctx = NULL; 2306 2307 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2308 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2309 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2310 return -EINVAL; 2311 2312 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2313 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2314 return -EINVAL; 2315 2316 memset(&sel, 0, sizeof(sel)); 2317 2318 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2319 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2320 sel.prefixlen_s = sa->sadb_address_prefixlen; 2321 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2322 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2323 if (sel.sport) 2324 sel.sport_mask = htons(0xffff); 2325 2326 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2327 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2328 sel.prefixlen_d = sa->sadb_address_prefixlen; 2329 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2330 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2331 if (sel.dport) 2332 sel.dport_mask = htons(0xffff); 2333 2334 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2335 if (sec_ctx != NULL) { 2336 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2337 2338 if (!uctx) 2339 return -ENOMEM; 2340 2341 err = security_xfrm_policy_alloc(&pol_ctx, uctx); 2342 kfree(uctx); 2343 if (err) 2344 return err; 2345 } 2346 2347 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2348 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2349 1, &err); 2350 security_xfrm_policy_free(pol_ctx); 2351 if (xp == NULL) 2352 return -ENOENT; 2353 2354 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2355 audit_get_loginuid(current), 2356 audit_get_sessionid(current), 0); 2357 2358 if (err) 2359 goto out; 2360 2361 c.seq = hdr->sadb_msg_seq; 2362 c.portid = hdr->sadb_msg_pid; 2363 c.data.byid = 0; 2364 c.event = XFRM_MSG_DELPOLICY; 2365 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2366 2367 out: 2368 xfrm_pol_put(xp); 2369 if (err == 0) 2370 xfrm_garbage_collect(net); 2371 return err; 2372 } 2373 2374 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2375 { 2376 int err; 2377 struct sk_buff *out_skb; 2378 struct sadb_msg *out_hdr; 2379 err = 0; 2380 2381 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2382 if (IS_ERR(out_skb)) { 2383 err = PTR_ERR(out_skb); 2384 goto out; 2385 } 2386 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2387 if (err < 0) 2388 goto out; 2389 2390 out_hdr = (struct sadb_msg *) out_skb->data; 2391 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2392 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2393 out_hdr->sadb_msg_satype = 0; 2394 out_hdr->sadb_msg_errno = 0; 2395 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2396 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2397 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2398 err = 0; 2399 2400 out: 2401 return err; 2402 } 2403 2404 #ifdef CONFIG_NET_KEY_MIGRATE 2405 static int pfkey_sockaddr_pair_size(sa_family_t family) 2406 { 2407 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2408 } 2409 2410 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2411 xfrm_address_t *saddr, xfrm_address_t *daddr, 2412 u16 *family) 2413 { 2414 int af, socklen; 2415 2416 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2417 return -EINVAL; 2418 2419 af = pfkey_sockaddr_extract(sa, saddr); 2420 if (!af) 2421 return -EINVAL; 2422 2423 socklen = pfkey_sockaddr_len(af); 2424 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2425 daddr) != af) 2426 return -EINVAL; 2427 2428 *family = af; 2429 return 0; 2430 } 2431 2432 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2433 struct xfrm_migrate *m) 2434 { 2435 int err; 2436 struct sadb_x_ipsecrequest *rq2; 2437 int mode; 2438 2439 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2440 len < rq1->sadb_x_ipsecrequest_len) 2441 return -EINVAL; 2442 2443 /* old endoints */ 2444 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2445 rq1->sadb_x_ipsecrequest_len, 2446 &m->old_saddr, &m->old_daddr, 2447 &m->old_family); 2448 if (err) 2449 return err; 2450 2451 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2452 len -= rq1->sadb_x_ipsecrequest_len; 2453 2454 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2455 len < rq2->sadb_x_ipsecrequest_len) 2456 return -EINVAL; 2457 2458 /* new endpoints */ 2459 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2460 rq2->sadb_x_ipsecrequest_len, 2461 &m->new_saddr, &m->new_daddr, 2462 &m->new_family); 2463 if (err) 2464 return err; 2465 2466 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2467 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2468 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2469 return -EINVAL; 2470 2471 m->proto = rq1->sadb_x_ipsecrequest_proto; 2472 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2473 return -EINVAL; 2474 m->mode = mode; 2475 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2476 2477 return ((int)(rq1->sadb_x_ipsecrequest_len + 2478 rq2->sadb_x_ipsecrequest_len)); 2479 } 2480 2481 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2482 const struct sadb_msg *hdr, void * const *ext_hdrs) 2483 { 2484 int i, len, ret, err = -EINVAL; 2485 u8 dir; 2486 struct sadb_address *sa; 2487 struct sadb_x_kmaddress *kma; 2488 struct sadb_x_policy *pol; 2489 struct sadb_x_ipsecrequest *rq; 2490 struct xfrm_selector sel; 2491 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2492 struct xfrm_kmaddress k; 2493 2494 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2495 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2496 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2497 err = -EINVAL; 2498 goto out; 2499 } 2500 2501 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2502 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2503 2504 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2505 err = -EINVAL; 2506 goto out; 2507 } 2508 2509 if (kma) { 2510 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2511 k.reserved = kma->sadb_x_kmaddress_reserved; 2512 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2513 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2514 &k.local, &k.remote, &k.family); 2515 if (ret < 0) { 2516 err = ret; 2517 goto out; 2518 } 2519 } 2520 2521 dir = pol->sadb_x_policy_dir - 1; 2522 memset(&sel, 0, sizeof(sel)); 2523 2524 /* set source address info of selector */ 2525 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2526 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2527 sel.prefixlen_s = sa->sadb_address_prefixlen; 2528 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2529 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2530 if (sel.sport) 2531 sel.sport_mask = htons(0xffff); 2532 2533 /* set destination address info of selector */ 2534 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2535 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2536 sel.prefixlen_d = sa->sadb_address_prefixlen; 2537 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2538 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2539 if (sel.dport) 2540 sel.dport_mask = htons(0xffff); 2541 2542 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2543 2544 /* extract ipsecrequests */ 2545 i = 0; 2546 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2547 2548 while (len > 0 && i < XFRM_MAX_DEPTH) { 2549 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2550 if (ret < 0) { 2551 err = ret; 2552 goto out; 2553 } else { 2554 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2555 len -= ret; 2556 i++; 2557 } 2558 } 2559 2560 if (!i || len > 0) { 2561 err = -EINVAL; 2562 goto out; 2563 } 2564 2565 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2566 kma ? &k : NULL); 2567 2568 out: 2569 return err; 2570 } 2571 #else 2572 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2573 const struct sadb_msg *hdr, void * const *ext_hdrs) 2574 { 2575 return -ENOPROTOOPT; 2576 } 2577 #endif 2578 2579 2580 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2581 { 2582 struct net *net = sock_net(sk); 2583 unsigned int dir; 2584 int err = 0, delete; 2585 struct sadb_x_policy *pol; 2586 struct xfrm_policy *xp; 2587 struct km_event c; 2588 2589 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2590 return -EINVAL; 2591 2592 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2593 if (dir >= XFRM_POLICY_MAX) 2594 return -EINVAL; 2595 2596 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2597 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2598 dir, pol->sadb_x_policy_id, delete, &err); 2599 if (xp == NULL) 2600 return -ENOENT; 2601 2602 if (delete) { 2603 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2604 audit_get_loginuid(current), 2605 audit_get_sessionid(current), 0); 2606 2607 if (err) 2608 goto out; 2609 c.seq = hdr->sadb_msg_seq; 2610 c.portid = hdr->sadb_msg_pid; 2611 c.data.byid = 1; 2612 c.event = XFRM_MSG_DELPOLICY; 2613 km_policy_notify(xp, dir, &c); 2614 } else { 2615 err = key_pol_get_resp(sk, xp, hdr, dir); 2616 } 2617 2618 out: 2619 xfrm_pol_put(xp); 2620 if (delete && err == 0) 2621 xfrm_garbage_collect(net); 2622 return err; 2623 } 2624 2625 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2626 { 2627 struct pfkey_sock *pfk = ptr; 2628 struct sk_buff *out_skb; 2629 struct sadb_msg *out_hdr; 2630 int err; 2631 2632 if (!pfkey_can_dump(&pfk->sk)) 2633 return -ENOBUFS; 2634 2635 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2636 if (IS_ERR(out_skb)) 2637 return PTR_ERR(out_skb); 2638 2639 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2640 if (err < 0) 2641 return err; 2642 2643 out_hdr = (struct sadb_msg *) out_skb->data; 2644 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2645 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2646 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2647 out_hdr->sadb_msg_errno = 0; 2648 out_hdr->sadb_msg_seq = count + 1; 2649 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2650 2651 if (pfk->dump.skb) 2652 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2653 &pfk->sk, sock_net(&pfk->sk)); 2654 pfk->dump.skb = out_skb; 2655 2656 return 0; 2657 } 2658 2659 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2660 { 2661 struct net *net = sock_net(&pfk->sk); 2662 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2663 } 2664 2665 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2666 { 2667 xfrm_policy_walk_done(&pfk->dump.u.policy); 2668 } 2669 2670 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2671 { 2672 struct pfkey_sock *pfk = pfkey_sk(sk); 2673 2674 if (pfk->dump.dump != NULL) 2675 return -EBUSY; 2676 2677 pfk->dump.msg_version = hdr->sadb_msg_version; 2678 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2679 pfk->dump.dump = pfkey_dump_sp; 2680 pfk->dump.done = pfkey_dump_sp_done; 2681 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2682 2683 return pfkey_do_dump(pfk); 2684 } 2685 2686 static int key_notify_policy_flush(const struct km_event *c) 2687 { 2688 struct sk_buff *skb_out; 2689 struct sadb_msg *hdr; 2690 2691 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2692 if (!skb_out) 2693 return -ENOBUFS; 2694 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2695 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2696 hdr->sadb_msg_seq = c->seq; 2697 hdr->sadb_msg_pid = c->portid; 2698 hdr->sadb_msg_version = PF_KEY_V2; 2699 hdr->sadb_msg_errno = (uint8_t) 0; 2700 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2701 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2702 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2703 return 0; 2704 2705 } 2706 2707 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2708 { 2709 struct net *net = sock_net(sk); 2710 struct km_event c; 2711 struct xfrm_audit audit_info; 2712 int err, err2; 2713 2714 audit_info.loginuid = audit_get_loginuid(current); 2715 audit_info.sessionid = audit_get_sessionid(current); 2716 audit_info.secid = 0; 2717 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); 2718 err2 = unicast_flush_resp(sk, hdr); 2719 if (err || err2) { 2720 if (err == -ESRCH) /* empty table - old silent behavior */ 2721 return 0; 2722 return err; 2723 } 2724 2725 c.data.type = XFRM_POLICY_TYPE_MAIN; 2726 c.event = XFRM_MSG_FLUSHPOLICY; 2727 c.portid = hdr->sadb_msg_pid; 2728 c.seq = hdr->sadb_msg_seq; 2729 c.net = net; 2730 km_policy_notify(NULL, 0, &c); 2731 2732 return 0; 2733 } 2734 2735 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2736 const struct sadb_msg *hdr, void * const *ext_hdrs); 2737 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2738 [SADB_RESERVED] = pfkey_reserved, 2739 [SADB_GETSPI] = pfkey_getspi, 2740 [SADB_UPDATE] = pfkey_add, 2741 [SADB_ADD] = pfkey_add, 2742 [SADB_DELETE] = pfkey_delete, 2743 [SADB_GET] = pfkey_get, 2744 [SADB_ACQUIRE] = pfkey_acquire, 2745 [SADB_REGISTER] = pfkey_register, 2746 [SADB_EXPIRE] = NULL, 2747 [SADB_FLUSH] = pfkey_flush, 2748 [SADB_DUMP] = pfkey_dump, 2749 [SADB_X_PROMISC] = pfkey_promisc, 2750 [SADB_X_PCHANGE] = NULL, 2751 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2752 [SADB_X_SPDADD] = pfkey_spdadd, 2753 [SADB_X_SPDDELETE] = pfkey_spddelete, 2754 [SADB_X_SPDGET] = pfkey_spdget, 2755 [SADB_X_SPDACQUIRE] = NULL, 2756 [SADB_X_SPDDUMP] = pfkey_spddump, 2757 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2758 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2759 [SADB_X_SPDDELETE2] = pfkey_spdget, 2760 [SADB_X_MIGRATE] = pfkey_migrate, 2761 }; 2762 2763 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2764 { 2765 void *ext_hdrs[SADB_EXT_MAX]; 2766 int err; 2767 2768 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2769 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2770 2771 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2772 err = parse_exthdrs(skb, hdr, ext_hdrs); 2773 if (!err) { 2774 err = -EOPNOTSUPP; 2775 if (pfkey_funcs[hdr->sadb_msg_type]) 2776 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2777 } 2778 return err; 2779 } 2780 2781 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2782 { 2783 struct sadb_msg *hdr = NULL; 2784 2785 if (skb->len < sizeof(*hdr)) { 2786 *errp = -EMSGSIZE; 2787 } else { 2788 hdr = (struct sadb_msg *) skb->data; 2789 if (hdr->sadb_msg_version != PF_KEY_V2 || 2790 hdr->sadb_msg_reserved != 0 || 2791 (hdr->sadb_msg_type <= SADB_RESERVED || 2792 hdr->sadb_msg_type > SADB_MAX)) { 2793 hdr = NULL; 2794 *errp = -EINVAL; 2795 } else if (hdr->sadb_msg_len != (skb->len / 2796 sizeof(uint64_t)) || 2797 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2798 sizeof(uint64_t))) { 2799 hdr = NULL; 2800 *errp = -EMSGSIZE; 2801 } else { 2802 *errp = 0; 2803 } 2804 } 2805 return hdr; 2806 } 2807 2808 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2809 const struct xfrm_algo_desc *d) 2810 { 2811 unsigned int id = d->desc.sadb_alg_id; 2812 2813 if (id >= sizeof(t->aalgos) * 8) 2814 return 0; 2815 2816 return (t->aalgos >> id) & 1; 2817 } 2818 2819 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2820 const struct xfrm_algo_desc *d) 2821 { 2822 unsigned int id = d->desc.sadb_alg_id; 2823 2824 if (id >= sizeof(t->ealgos) * 8) 2825 return 0; 2826 2827 return (t->ealgos >> id) & 1; 2828 } 2829 2830 static int count_ah_combs(const struct xfrm_tmpl *t) 2831 { 2832 int i, sz = 0; 2833 2834 for (i = 0; ; i++) { 2835 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2836 if (!aalg) 2837 break; 2838 if (!aalg->pfkey_supported) 2839 continue; 2840 if (aalg_tmpl_set(t, aalg) && aalg->available) 2841 sz += sizeof(struct sadb_comb); 2842 } 2843 return sz + sizeof(struct sadb_prop); 2844 } 2845 2846 static int count_esp_combs(const struct xfrm_tmpl *t) 2847 { 2848 int i, k, sz = 0; 2849 2850 for (i = 0; ; i++) { 2851 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2852 if (!ealg) 2853 break; 2854 2855 if (!ealg->pfkey_supported) 2856 continue; 2857 2858 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2859 continue; 2860 2861 for (k = 1; ; k++) { 2862 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2863 if (!aalg) 2864 break; 2865 2866 if (!aalg->pfkey_supported) 2867 continue; 2868 2869 if (aalg_tmpl_set(t, aalg) && aalg->available) 2870 sz += sizeof(struct sadb_comb); 2871 } 2872 } 2873 return sz + sizeof(struct sadb_prop); 2874 } 2875 2876 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2877 { 2878 struct sadb_prop *p; 2879 int i; 2880 2881 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2882 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2883 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2884 p->sadb_prop_replay = 32; 2885 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2886 2887 for (i = 0; ; i++) { 2888 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2889 if (!aalg) 2890 break; 2891 2892 if (!aalg->pfkey_supported) 2893 continue; 2894 2895 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2896 struct sadb_comb *c; 2897 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2898 memset(c, 0, sizeof(*c)); 2899 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2900 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2901 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2902 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2903 c->sadb_comb_hard_addtime = 24*60*60; 2904 c->sadb_comb_soft_addtime = 20*60*60; 2905 c->sadb_comb_hard_usetime = 8*60*60; 2906 c->sadb_comb_soft_usetime = 7*60*60; 2907 } 2908 } 2909 } 2910 2911 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2912 { 2913 struct sadb_prop *p; 2914 int i, k; 2915 2916 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2917 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2918 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2919 p->sadb_prop_replay = 32; 2920 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2921 2922 for (i=0; ; i++) { 2923 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2924 if (!ealg) 2925 break; 2926 2927 if (!ealg->pfkey_supported) 2928 continue; 2929 2930 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2931 continue; 2932 2933 for (k = 1; ; k++) { 2934 struct sadb_comb *c; 2935 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2936 if (!aalg) 2937 break; 2938 if (!aalg->pfkey_supported) 2939 continue; 2940 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2941 continue; 2942 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2943 memset(c, 0, sizeof(*c)); 2944 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2945 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2946 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2947 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2948 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2949 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2950 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2951 c->sadb_comb_hard_addtime = 24*60*60; 2952 c->sadb_comb_soft_addtime = 20*60*60; 2953 c->sadb_comb_hard_usetime = 8*60*60; 2954 c->sadb_comb_soft_usetime = 7*60*60; 2955 } 2956 } 2957 } 2958 2959 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 2960 { 2961 return 0; 2962 } 2963 2964 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 2965 { 2966 struct sk_buff *out_skb; 2967 struct sadb_msg *out_hdr; 2968 int hard; 2969 int hsc; 2970 2971 hard = c->data.hard; 2972 if (hard) 2973 hsc = 2; 2974 else 2975 hsc = 1; 2976 2977 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2978 if (IS_ERR(out_skb)) 2979 return PTR_ERR(out_skb); 2980 2981 out_hdr = (struct sadb_msg *) out_skb->data; 2982 out_hdr->sadb_msg_version = PF_KEY_V2; 2983 out_hdr->sadb_msg_type = SADB_EXPIRE; 2984 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2985 out_hdr->sadb_msg_errno = 0; 2986 out_hdr->sadb_msg_reserved = 0; 2987 out_hdr->sadb_msg_seq = 0; 2988 out_hdr->sadb_msg_pid = 0; 2989 2990 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2991 return 0; 2992 } 2993 2994 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 2995 { 2996 struct net *net = x ? xs_net(x) : c->net; 2997 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 2998 2999 if (atomic_read(&net_pfkey->socks_nr) == 0) 3000 return 0; 3001 3002 switch (c->event) { 3003 case XFRM_MSG_EXPIRE: 3004 return key_notify_sa_expire(x, c); 3005 case XFRM_MSG_DELSA: 3006 case XFRM_MSG_NEWSA: 3007 case XFRM_MSG_UPDSA: 3008 return key_notify_sa(x, c); 3009 case XFRM_MSG_FLUSHSA: 3010 return key_notify_sa_flush(c); 3011 case XFRM_MSG_NEWAE: /* not yet supported */ 3012 break; 3013 default: 3014 pr_err("pfkey: Unknown SA event %d\n", c->event); 3015 break; 3016 } 3017 3018 return 0; 3019 } 3020 3021 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3022 { 3023 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3024 return 0; 3025 3026 switch (c->event) { 3027 case XFRM_MSG_POLEXPIRE: 3028 return key_notify_policy_expire(xp, c); 3029 case XFRM_MSG_DELPOLICY: 3030 case XFRM_MSG_NEWPOLICY: 3031 case XFRM_MSG_UPDPOLICY: 3032 return key_notify_policy(xp, dir, c); 3033 case XFRM_MSG_FLUSHPOLICY: 3034 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3035 break; 3036 return key_notify_policy_flush(c); 3037 default: 3038 pr_err("pfkey: Unknown policy event %d\n", c->event); 3039 break; 3040 } 3041 3042 return 0; 3043 } 3044 3045 static u32 get_acqseq(void) 3046 { 3047 u32 res; 3048 static atomic_t acqseq; 3049 3050 do { 3051 res = atomic_inc_return(&acqseq); 3052 } while (!res); 3053 return res; 3054 } 3055 3056 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3057 { 3058 struct sk_buff *skb; 3059 struct sadb_msg *hdr; 3060 struct sadb_address *addr; 3061 struct sadb_x_policy *pol; 3062 int sockaddr_size; 3063 int size; 3064 struct sadb_x_sec_ctx *sec_ctx; 3065 struct xfrm_sec_ctx *xfrm_ctx; 3066 int ctx_size = 0; 3067 3068 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3069 if (!sockaddr_size) 3070 return -EINVAL; 3071 3072 size = sizeof(struct sadb_msg) + 3073 (sizeof(struct sadb_address) * 2) + 3074 (sockaddr_size * 2) + 3075 sizeof(struct sadb_x_policy); 3076 3077 if (x->id.proto == IPPROTO_AH) 3078 size += count_ah_combs(t); 3079 else if (x->id.proto == IPPROTO_ESP) 3080 size += count_esp_combs(t); 3081 3082 if ((xfrm_ctx = x->security)) { 3083 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3084 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3085 } 3086 3087 skb = alloc_skb(size + 16, GFP_ATOMIC); 3088 if (skb == NULL) 3089 return -ENOMEM; 3090 3091 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3092 hdr->sadb_msg_version = PF_KEY_V2; 3093 hdr->sadb_msg_type = SADB_ACQUIRE; 3094 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3095 hdr->sadb_msg_len = size / sizeof(uint64_t); 3096 hdr->sadb_msg_errno = 0; 3097 hdr->sadb_msg_reserved = 0; 3098 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3099 hdr->sadb_msg_pid = 0; 3100 3101 /* src address */ 3102 addr = (struct sadb_address*) skb_put(skb, 3103 sizeof(struct sadb_address)+sockaddr_size); 3104 addr->sadb_address_len = 3105 (sizeof(struct sadb_address)+sockaddr_size)/ 3106 sizeof(uint64_t); 3107 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3108 addr->sadb_address_proto = 0; 3109 addr->sadb_address_reserved = 0; 3110 addr->sadb_address_prefixlen = 3111 pfkey_sockaddr_fill(&x->props.saddr, 0, 3112 (struct sockaddr *) (addr + 1), 3113 x->props.family); 3114 if (!addr->sadb_address_prefixlen) 3115 BUG(); 3116 3117 /* dst address */ 3118 addr = (struct sadb_address*) skb_put(skb, 3119 sizeof(struct sadb_address)+sockaddr_size); 3120 addr->sadb_address_len = 3121 (sizeof(struct sadb_address)+sockaddr_size)/ 3122 sizeof(uint64_t); 3123 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3124 addr->sadb_address_proto = 0; 3125 addr->sadb_address_reserved = 0; 3126 addr->sadb_address_prefixlen = 3127 pfkey_sockaddr_fill(&x->id.daddr, 0, 3128 (struct sockaddr *) (addr + 1), 3129 x->props.family); 3130 if (!addr->sadb_address_prefixlen) 3131 BUG(); 3132 3133 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3134 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3135 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3136 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3137 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3138 pol->sadb_x_policy_id = xp->index; 3139 3140 /* Set sadb_comb's. */ 3141 if (x->id.proto == IPPROTO_AH) 3142 dump_ah_combs(skb, t); 3143 else if (x->id.proto == IPPROTO_ESP) 3144 dump_esp_combs(skb, t); 3145 3146 /* security context */ 3147 if (xfrm_ctx) { 3148 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3149 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3150 sec_ctx->sadb_x_sec_len = 3151 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3152 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3153 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3154 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3155 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3156 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3157 xfrm_ctx->ctx_len); 3158 } 3159 3160 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3161 } 3162 3163 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3164 u8 *data, int len, int *dir) 3165 { 3166 struct net *net = sock_net(sk); 3167 struct xfrm_policy *xp; 3168 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3169 struct sadb_x_sec_ctx *sec_ctx; 3170 3171 switch (sk->sk_family) { 3172 case AF_INET: 3173 if (opt != IP_IPSEC_POLICY) { 3174 *dir = -EOPNOTSUPP; 3175 return NULL; 3176 } 3177 break; 3178 #if IS_ENABLED(CONFIG_IPV6) 3179 case AF_INET6: 3180 if (opt != IPV6_IPSEC_POLICY) { 3181 *dir = -EOPNOTSUPP; 3182 return NULL; 3183 } 3184 break; 3185 #endif 3186 default: 3187 *dir = -EINVAL; 3188 return NULL; 3189 } 3190 3191 *dir = -EINVAL; 3192 3193 if (len < sizeof(struct sadb_x_policy) || 3194 pol->sadb_x_policy_len*8 > len || 3195 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3196 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3197 return NULL; 3198 3199 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3200 if (xp == NULL) { 3201 *dir = -ENOBUFS; 3202 return NULL; 3203 } 3204 3205 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3206 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3207 3208 xp->lft.soft_byte_limit = XFRM_INF; 3209 xp->lft.hard_byte_limit = XFRM_INF; 3210 xp->lft.soft_packet_limit = XFRM_INF; 3211 xp->lft.hard_packet_limit = XFRM_INF; 3212 xp->family = sk->sk_family; 3213 3214 xp->xfrm_nr = 0; 3215 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3216 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3217 goto out; 3218 3219 /* security context too */ 3220 if (len >= (pol->sadb_x_policy_len*8 + 3221 sizeof(struct sadb_x_sec_ctx))) { 3222 char *p = (char *)pol; 3223 struct xfrm_user_sec_ctx *uctx; 3224 3225 p += pol->sadb_x_policy_len*8; 3226 sec_ctx = (struct sadb_x_sec_ctx *)p; 3227 if (len < pol->sadb_x_policy_len*8 + 3228 sec_ctx->sadb_x_sec_len) { 3229 *dir = -EINVAL; 3230 goto out; 3231 } 3232 if ((*dir = verify_sec_ctx_len(p))) 3233 goto out; 3234 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3235 *dir = security_xfrm_policy_alloc(&xp->security, uctx); 3236 kfree(uctx); 3237 3238 if (*dir) 3239 goto out; 3240 } 3241 3242 *dir = pol->sadb_x_policy_dir-1; 3243 return xp; 3244 3245 out: 3246 xp->walk.dead = 1; 3247 xfrm_policy_destroy(xp); 3248 return NULL; 3249 } 3250 3251 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3252 { 3253 struct sk_buff *skb; 3254 struct sadb_msg *hdr; 3255 struct sadb_sa *sa; 3256 struct sadb_address *addr; 3257 struct sadb_x_nat_t_port *n_port; 3258 int sockaddr_size; 3259 int size; 3260 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3261 struct xfrm_encap_tmpl *natt = NULL; 3262 3263 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3264 if (!sockaddr_size) 3265 return -EINVAL; 3266 3267 if (!satype) 3268 return -EINVAL; 3269 3270 if (!x->encap) 3271 return -EINVAL; 3272 3273 natt = x->encap; 3274 3275 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3276 * 3277 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3278 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3279 */ 3280 3281 size = sizeof(struct sadb_msg) + 3282 sizeof(struct sadb_sa) + 3283 (sizeof(struct sadb_address) * 2) + 3284 (sockaddr_size * 2) + 3285 (sizeof(struct sadb_x_nat_t_port) * 2); 3286 3287 skb = alloc_skb(size + 16, GFP_ATOMIC); 3288 if (skb == NULL) 3289 return -ENOMEM; 3290 3291 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3292 hdr->sadb_msg_version = PF_KEY_V2; 3293 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3294 hdr->sadb_msg_satype = satype; 3295 hdr->sadb_msg_len = size / sizeof(uint64_t); 3296 hdr->sadb_msg_errno = 0; 3297 hdr->sadb_msg_reserved = 0; 3298 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3299 hdr->sadb_msg_pid = 0; 3300 3301 /* SA */ 3302 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3303 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3304 sa->sadb_sa_exttype = SADB_EXT_SA; 3305 sa->sadb_sa_spi = x->id.spi; 3306 sa->sadb_sa_replay = 0; 3307 sa->sadb_sa_state = 0; 3308 sa->sadb_sa_auth = 0; 3309 sa->sadb_sa_encrypt = 0; 3310 sa->sadb_sa_flags = 0; 3311 3312 /* ADDRESS_SRC (old addr) */ 3313 addr = (struct sadb_address*) 3314 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3315 addr->sadb_address_len = 3316 (sizeof(struct sadb_address)+sockaddr_size)/ 3317 sizeof(uint64_t); 3318 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3319 addr->sadb_address_proto = 0; 3320 addr->sadb_address_reserved = 0; 3321 addr->sadb_address_prefixlen = 3322 pfkey_sockaddr_fill(&x->props.saddr, 0, 3323 (struct sockaddr *) (addr + 1), 3324 x->props.family); 3325 if (!addr->sadb_address_prefixlen) 3326 BUG(); 3327 3328 /* NAT_T_SPORT (old port) */ 3329 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3330 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3331 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3332 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3333 n_port->sadb_x_nat_t_port_reserved = 0; 3334 3335 /* ADDRESS_DST (new addr) */ 3336 addr = (struct sadb_address*) 3337 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3338 addr->sadb_address_len = 3339 (sizeof(struct sadb_address)+sockaddr_size)/ 3340 sizeof(uint64_t); 3341 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3342 addr->sadb_address_proto = 0; 3343 addr->sadb_address_reserved = 0; 3344 addr->sadb_address_prefixlen = 3345 pfkey_sockaddr_fill(ipaddr, 0, 3346 (struct sockaddr *) (addr + 1), 3347 x->props.family); 3348 if (!addr->sadb_address_prefixlen) 3349 BUG(); 3350 3351 /* NAT_T_DPORT (new port) */ 3352 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3353 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3354 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3355 n_port->sadb_x_nat_t_port_port = sport; 3356 n_port->sadb_x_nat_t_port_reserved = 0; 3357 3358 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3359 } 3360 3361 #ifdef CONFIG_NET_KEY_MIGRATE 3362 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3363 const struct xfrm_selector *sel) 3364 { 3365 struct sadb_address *addr; 3366 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3367 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3368 addr->sadb_address_exttype = type; 3369 addr->sadb_address_proto = sel->proto; 3370 addr->sadb_address_reserved = 0; 3371 3372 switch (type) { 3373 case SADB_EXT_ADDRESS_SRC: 3374 addr->sadb_address_prefixlen = sel->prefixlen_s; 3375 pfkey_sockaddr_fill(&sel->saddr, 0, 3376 (struct sockaddr *)(addr + 1), 3377 sel->family); 3378 break; 3379 case SADB_EXT_ADDRESS_DST: 3380 addr->sadb_address_prefixlen = sel->prefixlen_d; 3381 pfkey_sockaddr_fill(&sel->daddr, 0, 3382 (struct sockaddr *)(addr + 1), 3383 sel->family); 3384 break; 3385 default: 3386 return -EINVAL; 3387 } 3388 3389 return 0; 3390 } 3391 3392 3393 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3394 { 3395 struct sadb_x_kmaddress *kma; 3396 u8 *sa; 3397 int family = k->family; 3398 int socklen = pfkey_sockaddr_len(family); 3399 int size_req; 3400 3401 size_req = (sizeof(struct sadb_x_kmaddress) + 3402 pfkey_sockaddr_pair_size(family)); 3403 3404 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3405 memset(kma, 0, size_req); 3406 kma->sadb_x_kmaddress_len = size_req / 8; 3407 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3408 kma->sadb_x_kmaddress_reserved = k->reserved; 3409 3410 sa = (u8 *)(kma + 1); 3411 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3412 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3413 return -EINVAL; 3414 3415 return 0; 3416 } 3417 3418 static int set_ipsecrequest(struct sk_buff *skb, 3419 uint8_t proto, uint8_t mode, int level, 3420 uint32_t reqid, uint8_t family, 3421 const xfrm_address_t *src, const xfrm_address_t *dst) 3422 { 3423 struct sadb_x_ipsecrequest *rq; 3424 u8 *sa; 3425 int socklen = pfkey_sockaddr_len(family); 3426 int size_req; 3427 3428 size_req = sizeof(struct sadb_x_ipsecrequest) + 3429 pfkey_sockaddr_pair_size(family); 3430 3431 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3432 memset(rq, 0, size_req); 3433 rq->sadb_x_ipsecrequest_len = size_req; 3434 rq->sadb_x_ipsecrequest_proto = proto; 3435 rq->sadb_x_ipsecrequest_mode = mode; 3436 rq->sadb_x_ipsecrequest_level = level; 3437 rq->sadb_x_ipsecrequest_reqid = reqid; 3438 3439 sa = (u8 *) (rq + 1); 3440 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3441 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3442 return -EINVAL; 3443 3444 return 0; 3445 } 3446 #endif 3447 3448 #ifdef CONFIG_NET_KEY_MIGRATE 3449 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3450 const struct xfrm_migrate *m, int num_bundles, 3451 const struct xfrm_kmaddress *k) 3452 { 3453 int i; 3454 int sasize_sel; 3455 int size = 0; 3456 int size_pol = 0; 3457 struct sk_buff *skb; 3458 struct sadb_msg *hdr; 3459 struct sadb_x_policy *pol; 3460 const struct xfrm_migrate *mp; 3461 3462 if (type != XFRM_POLICY_TYPE_MAIN) 3463 return 0; 3464 3465 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3466 return -EINVAL; 3467 3468 if (k != NULL) { 3469 /* addresses for KM */ 3470 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3471 pfkey_sockaddr_pair_size(k->family)); 3472 } 3473 3474 /* selector */ 3475 sasize_sel = pfkey_sockaddr_size(sel->family); 3476 if (!sasize_sel) 3477 return -EINVAL; 3478 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3479 3480 /* policy info */ 3481 size_pol += sizeof(struct sadb_x_policy); 3482 3483 /* ipsecrequests */ 3484 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3485 /* old locator pair */ 3486 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3487 pfkey_sockaddr_pair_size(mp->old_family); 3488 /* new locator pair */ 3489 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3490 pfkey_sockaddr_pair_size(mp->new_family); 3491 } 3492 3493 size += sizeof(struct sadb_msg) + size_pol; 3494 3495 /* alloc buffer */ 3496 skb = alloc_skb(size, GFP_ATOMIC); 3497 if (skb == NULL) 3498 return -ENOMEM; 3499 3500 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3501 hdr->sadb_msg_version = PF_KEY_V2; 3502 hdr->sadb_msg_type = SADB_X_MIGRATE; 3503 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3504 hdr->sadb_msg_len = size / 8; 3505 hdr->sadb_msg_errno = 0; 3506 hdr->sadb_msg_reserved = 0; 3507 hdr->sadb_msg_seq = 0; 3508 hdr->sadb_msg_pid = 0; 3509 3510 /* Addresses to be used by KM for negotiation, if ext is available */ 3511 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3512 goto err; 3513 3514 /* selector src */ 3515 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3516 3517 /* selector dst */ 3518 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3519 3520 /* policy information */ 3521 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3522 pol->sadb_x_policy_len = size_pol / 8; 3523 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3524 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3525 pol->sadb_x_policy_dir = dir + 1; 3526 pol->sadb_x_policy_id = 0; 3527 pol->sadb_x_policy_priority = 0; 3528 3529 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3530 /* old ipsecrequest */ 3531 int mode = pfkey_mode_from_xfrm(mp->mode); 3532 if (mode < 0) 3533 goto err; 3534 if (set_ipsecrequest(skb, mp->proto, mode, 3535 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3536 mp->reqid, mp->old_family, 3537 &mp->old_saddr, &mp->old_daddr) < 0) 3538 goto err; 3539 3540 /* new ipsecrequest */ 3541 if (set_ipsecrequest(skb, mp->proto, mode, 3542 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3543 mp->reqid, mp->new_family, 3544 &mp->new_saddr, &mp->new_daddr) < 0) 3545 goto err; 3546 } 3547 3548 /* broadcast migrate message to sockets */ 3549 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3550 3551 return 0; 3552 3553 err: 3554 kfree_skb(skb); 3555 return -EINVAL; 3556 } 3557 #else 3558 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3559 const struct xfrm_migrate *m, int num_bundles, 3560 const struct xfrm_kmaddress *k) 3561 { 3562 return -ENOPROTOOPT; 3563 } 3564 #endif 3565 3566 static int pfkey_sendmsg(struct kiocb *kiocb, 3567 struct socket *sock, struct msghdr *msg, size_t len) 3568 { 3569 struct sock *sk = sock->sk; 3570 struct sk_buff *skb = NULL; 3571 struct sadb_msg *hdr = NULL; 3572 int err; 3573 3574 err = -EOPNOTSUPP; 3575 if (msg->msg_flags & MSG_OOB) 3576 goto out; 3577 3578 err = -EMSGSIZE; 3579 if ((unsigned int)len > sk->sk_sndbuf - 32) 3580 goto out; 3581 3582 err = -ENOBUFS; 3583 skb = alloc_skb(len, GFP_KERNEL); 3584 if (skb == NULL) 3585 goto out; 3586 3587 err = -EFAULT; 3588 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3589 goto out; 3590 3591 hdr = pfkey_get_base_msg(skb, &err); 3592 if (!hdr) 3593 goto out; 3594 3595 mutex_lock(&xfrm_cfg_mutex); 3596 err = pfkey_process(sk, skb, hdr); 3597 mutex_unlock(&xfrm_cfg_mutex); 3598 3599 out: 3600 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3601 err = 0; 3602 kfree_skb(skb); 3603 3604 return err ? : len; 3605 } 3606 3607 static int pfkey_recvmsg(struct kiocb *kiocb, 3608 struct socket *sock, struct msghdr *msg, size_t len, 3609 int flags) 3610 { 3611 struct sock *sk = sock->sk; 3612 struct pfkey_sock *pfk = pfkey_sk(sk); 3613 struct sk_buff *skb; 3614 int copied, err; 3615 3616 err = -EINVAL; 3617 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3618 goto out; 3619 3620 msg->msg_namelen = 0; 3621 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3622 if (skb == NULL) 3623 goto out; 3624 3625 copied = skb->len; 3626 if (copied > len) { 3627 msg->msg_flags |= MSG_TRUNC; 3628 copied = len; 3629 } 3630 3631 skb_reset_transport_header(skb); 3632 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3633 if (err) 3634 goto out_free; 3635 3636 sock_recv_ts_and_drops(msg, sk, skb); 3637 3638 err = (flags & MSG_TRUNC) ? skb->len : copied; 3639 3640 if (pfk->dump.dump != NULL && 3641 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3642 pfkey_do_dump(pfk); 3643 3644 out_free: 3645 skb_free_datagram(sk, skb); 3646 out: 3647 return err; 3648 } 3649 3650 static const struct proto_ops pfkey_ops = { 3651 .family = PF_KEY, 3652 .owner = THIS_MODULE, 3653 /* Operations that make no sense on pfkey sockets. */ 3654 .bind = sock_no_bind, 3655 .connect = sock_no_connect, 3656 .socketpair = sock_no_socketpair, 3657 .accept = sock_no_accept, 3658 .getname = sock_no_getname, 3659 .ioctl = sock_no_ioctl, 3660 .listen = sock_no_listen, 3661 .shutdown = sock_no_shutdown, 3662 .setsockopt = sock_no_setsockopt, 3663 .getsockopt = sock_no_getsockopt, 3664 .mmap = sock_no_mmap, 3665 .sendpage = sock_no_sendpage, 3666 3667 /* Now the operations that really occur. */ 3668 .release = pfkey_release, 3669 .poll = datagram_poll, 3670 .sendmsg = pfkey_sendmsg, 3671 .recvmsg = pfkey_recvmsg, 3672 }; 3673 3674 static const struct net_proto_family pfkey_family_ops = { 3675 .family = PF_KEY, 3676 .create = pfkey_create, 3677 .owner = THIS_MODULE, 3678 }; 3679 3680 #ifdef CONFIG_PROC_FS 3681 static int pfkey_seq_show(struct seq_file *f, void *v) 3682 { 3683 struct sock *s = sk_entry(v); 3684 3685 if (v == SEQ_START_TOKEN) 3686 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3687 else 3688 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3689 s, 3690 atomic_read(&s->sk_refcnt), 3691 sk_rmem_alloc_get(s), 3692 sk_wmem_alloc_get(s), 3693 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3694 sock_i_ino(s) 3695 ); 3696 return 0; 3697 } 3698 3699 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3700 __acquires(rcu) 3701 { 3702 struct net *net = seq_file_net(f); 3703 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3704 3705 rcu_read_lock(); 3706 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3707 } 3708 3709 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3710 { 3711 struct net *net = seq_file_net(f); 3712 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3713 3714 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3715 } 3716 3717 static void pfkey_seq_stop(struct seq_file *f, void *v) 3718 __releases(rcu) 3719 { 3720 rcu_read_unlock(); 3721 } 3722 3723 static const struct seq_operations pfkey_seq_ops = { 3724 .start = pfkey_seq_start, 3725 .next = pfkey_seq_next, 3726 .stop = pfkey_seq_stop, 3727 .show = pfkey_seq_show, 3728 }; 3729 3730 static int pfkey_seq_open(struct inode *inode, struct file *file) 3731 { 3732 return seq_open_net(inode, file, &pfkey_seq_ops, 3733 sizeof(struct seq_net_private)); 3734 } 3735 3736 static const struct file_operations pfkey_proc_ops = { 3737 .open = pfkey_seq_open, 3738 .read = seq_read, 3739 .llseek = seq_lseek, 3740 .release = seq_release_net, 3741 }; 3742 3743 static int __net_init pfkey_init_proc(struct net *net) 3744 { 3745 struct proc_dir_entry *e; 3746 3747 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3748 if (e == NULL) 3749 return -ENOMEM; 3750 3751 return 0; 3752 } 3753 3754 static void __net_exit pfkey_exit_proc(struct net *net) 3755 { 3756 remove_proc_entry("pfkey", net->proc_net); 3757 } 3758 #else 3759 static inline int pfkey_init_proc(struct net *net) 3760 { 3761 return 0; 3762 } 3763 3764 static inline void pfkey_exit_proc(struct net *net) 3765 { 3766 } 3767 #endif 3768 3769 static struct xfrm_mgr pfkeyv2_mgr = 3770 { 3771 .id = "pfkeyv2", 3772 .notify = pfkey_send_notify, 3773 .acquire = pfkey_send_acquire, 3774 .compile_policy = pfkey_compile_policy, 3775 .new_mapping = pfkey_send_new_mapping, 3776 .notify_policy = pfkey_send_policy_notify, 3777 .migrate = pfkey_send_migrate, 3778 }; 3779 3780 static int __net_init pfkey_net_init(struct net *net) 3781 { 3782 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3783 int rv; 3784 3785 INIT_HLIST_HEAD(&net_pfkey->table); 3786 atomic_set(&net_pfkey->socks_nr, 0); 3787 3788 rv = pfkey_init_proc(net); 3789 3790 return rv; 3791 } 3792 3793 static void __net_exit pfkey_net_exit(struct net *net) 3794 { 3795 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3796 3797 pfkey_exit_proc(net); 3798 BUG_ON(!hlist_empty(&net_pfkey->table)); 3799 } 3800 3801 static struct pernet_operations pfkey_net_ops = { 3802 .init = pfkey_net_init, 3803 .exit = pfkey_net_exit, 3804 .id = &pfkey_net_id, 3805 .size = sizeof(struct netns_pfkey), 3806 }; 3807 3808 static void __exit ipsec_pfkey_exit(void) 3809 { 3810 xfrm_unregister_km(&pfkeyv2_mgr); 3811 sock_unregister(PF_KEY); 3812 unregister_pernet_subsys(&pfkey_net_ops); 3813 proto_unregister(&key_proto); 3814 } 3815 3816 static int __init ipsec_pfkey_init(void) 3817 { 3818 int err = proto_register(&key_proto, 0); 3819 3820 if (err != 0) 3821 goto out; 3822 3823 err = register_pernet_subsys(&pfkey_net_ops); 3824 if (err != 0) 3825 goto out_unregister_key_proto; 3826 err = sock_register(&pfkey_family_ops); 3827 if (err != 0) 3828 goto out_unregister_pernet; 3829 err = xfrm_register_km(&pfkeyv2_mgr); 3830 if (err != 0) 3831 goto out_sock_unregister; 3832 out: 3833 return err; 3834 3835 out_sock_unregister: 3836 sock_unregister(PF_KEY); 3837 out_unregister_pernet: 3838 unregister_pernet_subsys(&pfkey_net_ops); 3839 out_unregister_key_proto: 3840 proto_unregister(&key_proto); 3841 goto out; 3842 } 3843 3844 module_init(ipsec_pfkey_init); 3845 module_exit(ipsec_pfkey_exit); 3846 MODULE_LICENSE("GPL"); 3847 MODULE_ALIAS_NETPROTO(PF_KEY); 3848