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 hdr->sadb_msg_reserved = 0; 1714 1715 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 1716 1717 return 0; 1718 } 1719 1720 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1721 { 1722 struct net *net = sock_net(sk); 1723 unsigned int proto; 1724 struct km_event c; 1725 struct xfrm_audit audit_info; 1726 int err, err2; 1727 1728 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1729 if (proto == 0) 1730 return -EINVAL; 1731 1732 audit_info.loginuid = audit_get_loginuid(current); 1733 audit_info.sessionid = audit_get_sessionid(current); 1734 audit_info.secid = 0; 1735 err = xfrm_state_flush(net, proto, &audit_info); 1736 err2 = unicast_flush_resp(sk, hdr); 1737 if (err || err2) { 1738 if (err == -ESRCH) /* empty table - go quietly */ 1739 err = 0; 1740 return err ? err : err2; 1741 } 1742 1743 c.data.proto = proto; 1744 c.seq = hdr->sadb_msg_seq; 1745 c.portid = hdr->sadb_msg_pid; 1746 c.event = XFRM_MSG_FLUSHSA; 1747 c.net = net; 1748 km_state_notify(NULL, &c); 1749 1750 return 0; 1751 } 1752 1753 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1754 { 1755 struct pfkey_sock *pfk = ptr; 1756 struct sk_buff *out_skb; 1757 struct sadb_msg *out_hdr; 1758 1759 if (!pfkey_can_dump(&pfk->sk)) 1760 return -ENOBUFS; 1761 1762 out_skb = pfkey_xfrm_state2msg(x); 1763 if (IS_ERR(out_skb)) 1764 return PTR_ERR(out_skb); 1765 1766 out_hdr = (struct sadb_msg *) out_skb->data; 1767 out_hdr->sadb_msg_version = pfk->dump.msg_version; 1768 out_hdr->sadb_msg_type = SADB_DUMP; 1769 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1770 out_hdr->sadb_msg_errno = 0; 1771 out_hdr->sadb_msg_reserved = 0; 1772 out_hdr->sadb_msg_seq = count + 1; 1773 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 1774 1775 if (pfk->dump.skb) 1776 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 1777 &pfk->sk, sock_net(&pfk->sk)); 1778 pfk->dump.skb = out_skb; 1779 1780 return 0; 1781 } 1782 1783 static int pfkey_dump_sa(struct pfkey_sock *pfk) 1784 { 1785 struct net *net = sock_net(&pfk->sk); 1786 return xfrm_state_walk(net, &pfk->dump.u.state, dump_sa, (void *) pfk); 1787 } 1788 1789 static void pfkey_dump_sa_done(struct pfkey_sock *pfk) 1790 { 1791 xfrm_state_walk_done(&pfk->dump.u.state); 1792 } 1793 1794 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1795 { 1796 u8 proto; 1797 struct pfkey_sock *pfk = pfkey_sk(sk); 1798 1799 if (pfk->dump.dump != NULL) 1800 return -EBUSY; 1801 1802 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1803 if (proto == 0) 1804 return -EINVAL; 1805 1806 pfk->dump.msg_version = hdr->sadb_msg_version; 1807 pfk->dump.msg_portid = hdr->sadb_msg_pid; 1808 pfk->dump.dump = pfkey_dump_sa; 1809 pfk->dump.done = pfkey_dump_sa_done; 1810 xfrm_state_walk_init(&pfk->dump.u.state, proto); 1811 1812 return pfkey_do_dump(pfk); 1813 } 1814 1815 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 1816 { 1817 struct pfkey_sock *pfk = pfkey_sk(sk); 1818 int satype = hdr->sadb_msg_satype; 1819 bool reset_errno = false; 1820 1821 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1822 reset_errno = true; 1823 if (satype != 0 && satype != 1) 1824 return -EINVAL; 1825 pfk->promisc = satype; 1826 } 1827 if (reset_errno && skb_cloned(skb)) 1828 skb = skb_copy(skb, GFP_KERNEL); 1829 else 1830 skb = skb_clone(skb, GFP_KERNEL); 1831 1832 if (reset_errno && skb) { 1833 struct sadb_msg *new_hdr = (struct sadb_msg *) skb->data; 1834 new_hdr->sadb_msg_errno = 0; 1835 } 1836 1837 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ALL, NULL, sock_net(sk)); 1838 return 0; 1839 } 1840 1841 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1842 { 1843 int i; 1844 u32 reqid = *(u32*)ptr; 1845 1846 for (i=0; i<xp->xfrm_nr; i++) { 1847 if (xp->xfrm_vec[i].reqid == reqid) 1848 return -EEXIST; 1849 } 1850 return 0; 1851 } 1852 1853 static u32 gen_reqid(struct net *net) 1854 { 1855 struct xfrm_policy_walk walk; 1856 u32 start; 1857 int rc; 1858 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1859 1860 start = reqid; 1861 do { 1862 ++reqid; 1863 if (reqid == 0) 1864 reqid = IPSEC_MANUAL_REQID_MAX+1; 1865 xfrm_policy_walk_init(&walk, XFRM_POLICY_TYPE_MAIN); 1866 rc = xfrm_policy_walk(net, &walk, check_reqid, (void*)&reqid); 1867 xfrm_policy_walk_done(&walk); 1868 if (rc != -EEXIST) 1869 return reqid; 1870 } while (reqid != start); 1871 return 0; 1872 } 1873 1874 static int 1875 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1876 { 1877 struct net *net = xp_net(xp); 1878 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1879 int mode; 1880 1881 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1882 return -ELOOP; 1883 1884 if (rq->sadb_x_ipsecrequest_mode == 0) 1885 return -EINVAL; 1886 1887 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1888 if ((mode = pfkey_mode_to_xfrm(rq->sadb_x_ipsecrequest_mode)) < 0) 1889 return -EINVAL; 1890 t->mode = mode; 1891 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1892 t->optional = 1; 1893 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1894 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1895 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1896 t->reqid = 0; 1897 if (!t->reqid && !(t->reqid = gen_reqid(net))) 1898 return -ENOBUFS; 1899 } 1900 1901 /* addresses present only in tunnel mode */ 1902 if (t->mode == XFRM_MODE_TUNNEL) { 1903 u8 *sa = (u8 *) (rq + 1); 1904 int family, socklen; 1905 1906 family = pfkey_sockaddr_extract((struct sockaddr *)sa, 1907 &t->saddr); 1908 if (!family) 1909 return -EINVAL; 1910 1911 socklen = pfkey_sockaddr_len(family); 1912 if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen), 1913 &t->id.daddr) != family) 1914 return -EINVAL; 1915 t->encap_family = family; 1916 } else 1917 t->encap_family = xp->family; 1918 1919 /* No way to set this via kame pfkey */ 1920 t->allalgs = 1; 1921 xp->xfrm_nr++; 1922 return 0; 1923 } 1924 1925 static int 1926 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1927 { 1928 int err; 1929 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1930 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1931 1932 if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy)) 1933 return -EINVAL; 1934 1935 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1936 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1937 return err; 1938 len -= rq->sadb_x_ipsecrequest_len; 1939 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1940 } 1941 return 0; 1942 } 1943 1944 static inline int pfkey_xfrm_policy2sec_ctx_size(const struct xfrm_policy *xp) 1945 { 1946 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1947 1948 if (xfrm_ctx) { 1949 int len = sizeof(struct sadb_x_sec_ctx); 1950 len += xfrm_ctx->ctx_len; 1951 return PFKEY_ALIGN8(len); 1952 } 1953 return 0; 1954 } 1955 1956 static int pfkey_xfrm_policy2msg_size(const struct xfrm_policy *xp) 1957 { 1958 const struct xfrm_tmpl *t; 1959 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1960 int socklen = 0; 1961 int i; 1962 1963 for (i=0; i<xp->xfrm_nr; i++) { 1964 t = xp->xfrm_vec + i; 1965 socklen += pfkey_sockaddr_len(t->encap_family); 1966 } 1967 1968 return sizeof(struct sadb_msg) + 1969 (sizeof(struct sadb_lifetime) * 3) + 1970 (sizeof(struct sadb_address) * 2) + 1971 (sockaddr_size * 2) + 1972 sizeof(struct sadb_x_policy) + 1973 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1974 (socklen * 2) + 1975 pfkey_xfrm_policy2sec_ctx_size(xp); 1976 } 1977 1978 static struct sk_buff * pfkey_xfrm_policy2msg_prep(const struct xfrm_policy *xp) 1979 { 1980 struct sk_buff *skb; 1981 int size; 1982 1983 size = pfkey_xfrm_policy2msg_size(xp); 1984 1985 skb = alloc_skb(size + 16, GFP_ATOMIC); 1986 if (skb == NULL) 1987 return ERR_PTR(-ENOBUFS); 1988 1989 return skb; 1990 } 1991 1992 static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy *xp, int dir) 1993 { 1994 struct sadb_msg *hdr; 1995 struct sadb_address *addr; 1996 struct sadb_lifetime *lifetime; 1997 struct sadb_x_policy *pol; 1998 struct sadb_x_sec_ctx *sec_ctx; 1999 struct xfrm_sec_ctx *xfrm_ctx; 2000 int i; 2001 int size; 2002 int sockaddr_size = pfkey_sockaddr_size(xp->family); 2003 int socklen = pfkey_sockaddr_len(xp->family); 2004 2005 size = pfkey_xfrm_policy2msg_size(xp); 2006 2007 /* call should fill header later */ 2008 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2009 memset(hdr, 0, size); /* XXX do we need this ? */ 2010 2011 /* src address */ 2012 addr = (struct sadb_address*) skb_put(skb, 2013 sizeof(struct sadb_address)+sockaddr_size); 2014 addr->sadb_address_len = 2015 (sizeof(struct sadb_address)+sockaddr_size)/ 2016 sizeof(uint64_t); 2017 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2018 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2019 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 2020 addr->sadb_address_reserved = 0; 2021 if (!pfkey_sockaddr_fill(&xp->selector.saddr, 2022 xp->selector.sport, 2023 (struct sockaddr *) (addr + 1), 2024 xp->family)) 2025 BUG(); 2026 2027 /* dst address */ 2028 addr = (struct sadb_address*) skb_put(skb, 2029 sizeof(struct sadb_address)+sockaddr_size); 2030 addr->sadb_address_len = 2031 (sizeof(struct sadb_address)+sockaddr_size)/ 2032 sizeof(uint64_t); 2033 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2034 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 2035 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 2036 addr->sadb_address_reserved = 0; 2037 2038 pfkey_sockaddr_fill(&xp->selector.daddr, xp->selector.dport, 2039 (struct sockaddr *) (addr + 1), 2040 xp->family); 2041 2042 /* hard time */ 2043 lifetime = (struct sadb_lifetime *) skb_put(skb, 2044 sizeof(struct sadb_lifetime)); 2045 lifetime->sadb_lifetime_len = 2046 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2047 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2048 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 2049 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 2050 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 2051 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 2052 /* soft time */ 2053 lifetime = (struct sadb_lifetime *) skb_put(skb, 2054 sizeof(struct sadb_lifetime)); 2055 lifetime->sadb_lifetime_len = 2056 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2057 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 2058 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 2059 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 2060 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 2061 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 2062 /* current time */ 2063 lifetime = (struct sadb_lifetime *) skb_put(skb, 2064 sizeof(struct sadb_lifetime)); 2065 lifetime->sadb_lifetime_len = 2066 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 2067 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2068 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 2069 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 2070 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 2071 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 2072 2073 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2074 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2075 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2076 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2077 if (xp->action == XFRM_POLICY_ALLOW) { 2078 if (xp->xfrm_nr) 2079 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2080 else 2081 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2082 } 2083 pol->sadb_x_policy_dir = dir+1; 2084 pol->sadb_x_policy_reserved = 0; 2085 pol->sadb_x_policy_id = xp->index; 2086 pol->sadb_x_policy_priority = xp->priority; 2087 2088 for (i=0; i<xp->xfrm_nr; i++) { 2089 const struct xfrm_tmpl *t = xp->xfrm_vec + i; 2090 struct sadb_x_ipsecrequest *rq; 2091 int req_size; 2092 int mode; 2093 2094 req_size = sizeof(struct sadb_x_ipsecrequest); 2095 if (t->mode == XFRM_MODE_TUNNEL) { 2096 socklen = pfkey_sockaddr_len(t->encap_family); 2097 req_size += socklen * 2; 2098 } else { 2099 size -= 2*socklen; 2100 } 2101 rq = (void*)skb_put(skb, req_size); 2102 pol->sadb_x_policy_len += req_size/8; 2103 memset(rq, 0, sizeof(*rq)); 2104 rq->sadb_x_ipsecrequest_len = req_size; 2105 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2106 if ((mode = pfkey_mode_from_xfrm(t->mode)) < 0) 2107 return -EINVAL; 2108 rq->sadb_x_ipsecrequest_mode = mode; 2109 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2110 if (t->reqid) 2111 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2112 if (t->optional) 2113 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2114 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2115 2116 if (t->mode == XFRM_MODE_TUNNEL) { 2117 u8 *sa = (void *)(rq + 1); 2118 pfkey_sockaddr_fill(&t->saddr, 0, 2119 (struct sockaddr *)sa, 2120 t->encap_family); 2121 pfkey_sockaddr_fill(&t->id.daddr, 0, 2122 (struct sockaddr *) (sa + socklen), 2123 t->encap_family); 2124 } 2125 } 2126 2127 /* security context */ 2128 if ((xfrm_ctx = xp->security)) { 2129 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2130 2131 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2132 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2133 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2134 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2135 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2136 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2137 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2138 xfrm_ctx->ctx_len); 2139 } 2140 2141 hdr->sadb_msg_len = size / sizeof(uint64_t); 2142 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2143 2144 return 0; 2145 } 2146 2147 static int key_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c) 2148 { 2149 struct sk_buff *out_skb; 2150 struct sadb_msg *out_hdr; 2151 int err; 2152 2153 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2154 if (IS_ERR(out_skb)) 2155 return PTR_ERR(out_skb); 2156 2157 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2158 if (err < 0) 2159 return err; 2160 2161 out_hdr = (struct sadb_msg *) out_skb->data; 2162 out_hdr->sadb_msg_version = PF_KEY_V2; 2163 2164 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2165 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2166 else 2167 out_hdr->sadb_msg_type = event2poltype(c->event); 2168 out_hdr->sadb_msg_errno = 0; 2169 out_hdr->sadb_msg_seq = c->seq; 2170 out_hdr->sadb_msg_pid = c->portid; 2171 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL, xp_net(xp)); 2172 return 0; 2173 2174 } 2175 2176 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2177 { 2178 struct net *net = sock_net(sk); 2179 int err = 0; 2180 struct sadb_lifetime *lifetime; 2181 struct sadb_address *sa; 2182 struct sadb_x_policy *pol; 2183 struct xfrm_policy *xp; 2184 struct km_event c; 2185 struct sadb_x_sec_ctx *sec_ctx; 2186 2187 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2188 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2189 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2190 return -EINVAL; 2191 2192 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2193 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2194 return -EINVAL; 2195 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2196 return -EINVAL; 2197 2198 xp = xfrm_policy_alloc(net, GFP_KERNEL); 2199 if (xp == NULL) 2200 return -ENOBUFS; 2201 2202 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2203 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2204 xp->priority = pol->sadb_x_policy_priority; 2205 2206 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2207 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2208 if (!xp->family) { 2209 err = -EINVAL; 2210 goto out; 2211 } 2212 xp->selector.family = xp->family; 2213 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2214 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2215 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2216 if (xp->selector.sport) 2217 xp->selector.sport_mask = htons(0xffff); 2218 2219 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2220 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2221 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2222 2223 /* Amusing, we set this twice. KAME apps appear to set same value 2224 * in both addresses. 2225 */ 2226 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2227 2228 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2229 if (xp->selector.dport) 2230 xp->selector.dport_mask = htons(0xffff); 2231 2232 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2233 if (sec_ctx != NULL) { 2234 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2235 2236 if (!uctx) { 2237 err = -ENOBUFS; 2238 goto out; 2239 } 2240 2241 err = security_xfrm_policy_alloc(&xp->security, uctx); 2242 kfree(uctx); 2243 2244 if (err) 2245 goto out; 2246 } 2247 2248 xp->lft.soft_byte_limit = XFRM_INF; 2249 xp->lft.hard_byte_limit = XFRM_INF; 2250 xp->lft.soft_packet_limit = XFRM_INF; 2251 xp->lft.hard_packet_limit = XFRM_INF; 2252 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2253 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2254 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2255 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2256 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2257 } 2258 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2259 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2260 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2261 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2262 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2263 } 2264 xp->xfrm_nr = 0; 2265 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2266 (err = parse_ipsecrequests(xp, pol)) < 0) 2267 goto out; 2268 2269 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2270 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2271 2272 xfrm_audit_policy_add(xp, err ? 0 : 1, 2273 audit_get_loginuid(current), 2274 audit_get_sessionid(current), 0); 2275 2276 if (err) 2277 goto out; 2278 2279 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2280 c.event = XFRM_MSG_UPDPOLICY; 2281 else 2282 c.event = XFRM_MSG_NEWPOLICY; 2283 2284 c.seq = hdr->sadb_msg_seq; 2285 c.portid = hdr->sadb_msg_pid; 2286 2287 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2288 xfrm_pol_put(xp); 2289 return 0; 2290 2291 out: 2292 xp->walk.dead = 1; 2293 xfrm_policy_destroy(xp); 2294 return err; 2295 } 2296 2297 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2298 { 2299 struct net *net = sock_net(sk); 2300 int err; 2301 struct sadb_address *sa; 2302 struct sadb_x_policy *pol; 2303 struct xfrm_policy *xp; 2304 struct xfrm_selector sel; 2305 struct km_event c; 2306 struct sadb_x_sec_ctx *sec_ctx; 2307 struct xfrm_sec_ctx *pol_ctx = NULL; 2308 2309 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2310 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2311 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2312 return -EINVAL; 2313 2314 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2315 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2316 return -EINVAL; 2317 2318 memset(&sel, 0, sizeof(sel)); 2319 2320 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 2321 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2322 sel.prefixlen_s = sa->sadb_address_prefixlen; 2323 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2324 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2325 if (sel.sport) 2326 sel.sport_mask = htons(0xffff); 2327 2328 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 2329 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2330 sel.prefixlen_d = sa->sadb_address_prefixlen; 2331 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2332 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2333 if (sel.dport) 2334 sel.dport_mask = htons(0xffff); 2335 2336 sec_ctx = ext_hdrs[SADB_X_EXT_SEC_CTX - 1]; 2337 if (sec_ctx != NULL) { 2338 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2339 2340 if (!uctx) 2341 return -ENOMEM; 2342 2343 err = security_xfrm_policy_alloc(&pol_ctx, uctx); 2344 kfree(uctx); 2345 if (err) 2346 return err; 2347 } 2348 2349 xp = xfrm_policy_bysel_ctx(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2350 pol->sadb_x_policy_dir - 1, &sel, pol_ctx, 2351 1, &err); 2352 security_xfrm_policy_free(pol_ctx); 2353 if (xp == NULL) 2354 return -ENOENT; 2355 2356 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2357 audit_get_loginuid(current), 2358 audit_get_sessionid(current), 0); 2359 2360 if (err) 2361 goto out; 2362 2363 c.seq = hdr->sadb_msg_seq; 2364 c.portid = hdr->sadb_msg_pid; 2365 c.data.byid = 0; 2366 c.event = XFRM_MSG_DELPOLICY; 2367 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2368 2369 out: 2370 xfrm_pol_put(xp); 2371 if (err == 0) 2372 xfrm_garbage_collect(net); 2373 return err; 2374 } 2375 2376 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, const struct sadb_msg *hdr, int dir) 2377 { 2378 int err; 2379 struct sk_buff *out_skb; 2380 struct sadb_msg *out_hdr; 2381 err = 0; 2382 2383 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2384 if (IS_ERR(out_skb)) { 2385 err = PTR_ERR(out_skb); 2386 goto out; 2387 } 2388 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2389 if (err < 0) 2390 goto out; 2391 2392 out_hdr = (struct sadb_msg *) out_skb->data; 2393 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2394 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2395 out_hdr->sadb_msg_satype = 0; 2396 out_hdr->sadb_msg_errno = 0; 2397 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2398 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2399 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk, xp_net(xp)); 2400 err = 0; 2401 2402 out: 2403 return err; 2404 } 2405 2406 #ifdef CONFIG_NET_KEY_MIGRATE 2407 static int pfkey_sockaddr_pair_size(sa_family_t family) 2408 { 2409 return PFKEY_ALIGN8(pfkey_sockaddr_len(family) * 2); 2410 } 2411 2412 static int parse_sockaddr_pair(struct sockaddr *sa, int ext_len, 2413 xfrm_address_t *saddr, xfrm_address_t *daddr, 2414 u16 *family) 2415 { 2416 int af, socklen; 2417 2418 if (ext_len < pfkey_sockaddr_pair_size(sa->sa_family)) 2419 return -EINVAL; 2420 2421 af = pfkey_sockaddr_extract(sa, saddr); 2422 if (!af) 2423 return -EINVAL; 2424 2425 socklen = pfkey_sockaddr_len(af); 2426 if (pfkey_sockaddr_extract((struct sockaddr *) (((u8 *)sa) + socklen), 2427 daddr) != af) 2428 return -EINVAL; 2429 2430 *family = af; 2431 return 0; 2432 } 2433 2434 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2435 struct xfrm_migrate *m) 2436 { 2437 int err; 2438 struct sadb_x_ipsecrequest *rq2; 2439 int mode; 2440 2441 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2442 len < rq1->sadb_x_ipsecrequest_len) 2443 return -EINVAL; 2444 2445 /* old endoints */ 2446 err = parse_sockaddr_pair((struct sockaddr *)(rq1 + 1), 2447 rq1->sadb_x_ipsecrequest_len, 2448 &m->old_saddr, &m->old_daddr, 2449 &m->old_family); 2450 if (err) 2451 return err; 2452 2453 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2454 len -= rq1->sadb_x_ipsecrequest_len; 2455 2456 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2457 len < rq2->sadb_x_ipsecrequest_len) 2458 return -EINVAL; 2459 2460 /* new endpoints */ 2461 err = parse_sockaddr_pair((struct sockaddr *)(rq2 + 1), 2462 rq2->sadb_x_ipsecrequest_len, 2463 &m->new_saddr, &m->new_daddr, 2464 &m->new_family); 2465 if (err) 2466 return err; 2467 2468 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2469 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2470 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2471 return -EINVAL; 2472 2473 m->proto = rq1->sadb_x_ipsecrequest_proto; 2474 if ((mode = pfkey_mode_to_xfrm(rq1->sadb_x_ipsecrequest_mode)) < 0) 2475 return -EINVAL; 2476 m->mode = mode; 2477 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2478 2479 return ((int)(rq1->sadb_x_ipsecrequest_len + 2480 rq2->sadb_x_ipsecrequest_len)); 2481 } 2482 2483 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2484 const struct sadb_msg *hdr, void * const *ext_hdrs) 2485 { 2486 int i, len, ret, err = -EINVAL; 2487 u8 dir; 2488 struct sadb_address *sa; 2489 struct sadb_x_kmaddress *kma; 2490 struct sadb_x_policy *pol; 2491 struct sadb_x_ipsecrequest *rq; 2492 struct xfrm_selector sel; 2493 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2494 struct xfrm_kmaddress k; 2495 2496 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2497 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2498 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2499 err = -EINVAL; 2500 goto out; 2501 } 2502 2503 kma = ext_hdrs[SADB_X_EXT_KMADDRESS - 1]; 2504 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2505 2506 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2507 err = -EINVAL; 2508 goto out; 2509 } 2510 2511 if (kma) { 2512 /* convert sadb_x_kmaddress to xfrm_kmaddress */ 2513 k.reserved = kma->sadb_x_kmaddress_reserved; 2514 ret = parse_sockaddr_pair((struct sockaddr *)(kma + 1), 2515 8*(kma->sadb_x_kmaddress_len) - sizeof(*kma), 2516 &k.local, &k.remote, &k.family); 2517 if (ret < 0) { 2518 err = ret; 2519 goto out; 2520 } 2521 } 2522 2523 dir = pol->sadb_x_policy_dir - 1; 2524 memset(&sel, 0, sizeof(sel)); 2525 2526 /* set source address info of selector */ 2527 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2528 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2529 sel.prefixlen_s = sa->sadb_address_prefixlen; 2530 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2531 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2532 if (sel.sport) 2533 sel.sport_mask = htons(0xffff); 2534 2535 /* set destination address info of selector */ 2536 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2537 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2538 sel.prefixlen_d = sa->sadb_address_prefixlen; 2539 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2540 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2541 if (sel.dport) 2542 sel.dport_mask = htons(0xffff); 2543 2544 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2545 2546 /* extract ipsecrequests */ 2547 i = 0; 2548 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2549 2550 while (len > 0 && i < XFRM_MAX_DEPTH) { 2551 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2552 if (ret < 0) { 2553 err = ret; 2554 goto out; 2555 } else { 2556 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2557 len -= ret; 2558 i++; 2559 } 2560 } 2561 2562 if (!i || len > 0) { 2563 err = -EINVAL; 2564 goto out; 2565 } 2566 2567 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i, 2568 kma ? &k : NULL); 2569 2570 out: 2571 return err; 2572 } 2573 #else 2574 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2575 const struct sadb_msg *hdr, void * const *ext_hdrs) 2576 { 2577 return -ENOPROTOOPT; 2578 } 2579 #endif 2580 2581 2582 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2583 { 2584 struct net *net = sock_net(sk); 2585 unsigned int dir; 2586 int err = 0, delete; 2587 struct sadb_x_policy *pol; 2588 struct xfrm_policy *xp; 2589 struct km_event c; 2590 2591 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2592 return -EINVAL; 2593 2594 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2595 if (dir >= XFRM_POLICY_MAX) 2596 return -EINVAL; 2597 2598 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2599 xp = xfrm_policy_byid(net, DUMMY_MARK, XFRM_POLICY_TYPE_MAIN, 2600 dir, pol->sadb_x_policy_id, delete, &err); 2601 if (xp == NULL) 2602 return -ENOENT; 2603 2604 if (delete) { 2605 xfrm_audit_policy_delete(xp, err ? 0 : 1, 2606 audit_get_loginuid(current), 2607 audit_get_sessionid(current), 0); 2608 2609 if (err) 2610 goto out; 2611 c.seq = hdr->sadb_msg_seq; 2612 c.portid = hdr->sadb_msg_pid; 2613 c.data.byid = 1; 2614 c.event = XFRM_MSG_DELPOLICY; 2615 km_policy_notify(xp, dir, &c); 2616 } else { 2617 err = key_pol_get_resp(sk, xp, hdr, dir); 2618 } 2619 2620 out: 2621 xfrm_pol_put(xp); 2622 if (delete && err == 0) 2623 xfrm_garbage_collect(net); 2624 return err; 2625 } 2626 2627 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2628 { 2629 struct pfkey_sock *pfk = ptr; 2630 struct sk_buff *out_skb; 2631 struct sadb_msg *out_hdr; 2632 int err; 2633 2634 if (!pfkey_can_dump(&pfk->sk)) 2635 return -ENOBUFS; 2636 2637 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2638 if (IS_ERR(out_skb)) 2639 return PTR_ERR(out_skb); 2640 2641 err = pfkey_xfrm_policy2msg(out_skb, xp, dir); 2642 if (err < 0) 2643 return err; 2644 2645 out_hdr = (struct sadb_msg *) out_skb->data; 2646 out_hdr->sadb_msg_version = pfk->dump.msg_version; 2647 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2648 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2649 out_hdr->sadb_msg_errno = 0; 2650 out_hdr->sadb_msg_seq = count + 1; 2651 out_hdr->sadb_msg_pid = pfk->dump.msg_portid; 2652 2653 if (pfk->dump.skb) 2654 pfkey_broadcast(pfk->dump.skb, GFP_ATOMIC, BROADCAST_ONE, 2655 &pfk->sk, sock_net(&pfk->sk)); 2656 pfk->dump.skb = out_skb; 2657 2658 return 0; 2659 } 2660 2661 static int pfkey_dump_sp(struct pfkey_sock *pfk) 2662 { 2663 struct net *net = sock_net(&pfk->sk); 2664 return xfrm_policy_walk(net, &pfk->dump.u.policy, dump_sp, (void *) pfk); 2665 } 2666 2667 static void pfkey_dump_sp_done(struct pfkey_sock *pfk) 2668 { 2669 xfrm_policy_walk_done(&pfk->dump.u.policy); 2670 } 2671 2672 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2673 { 2674 struct pfkey_sock *pfk = pfkey_sk(sk); 2675 2676 if (pfk->dump.dump != NULL) 2677 return -EBUSY; 2678 2679 pfk->dump.msg_version = hdr->sadb_msg_version; 2680 pfk->dump.msg_portid = hdr->sadb_msg_pid; 2681 pfk->dump.dump = pfkey_dump_sp; 2682 pfk->dump.done = pfkey_dump_sp_done; 2683 xfrm_policy_walk_init(&pfk->dump.u.policy, XFRM_POLICY_TYPE_MAIN); 2684 2685 return pfkey_do_dump(pfk); 2686 } 2687 2688 static int key_notify_policy_flush(const struct km_event *c) 2689 { 2690 struct sk_buff *skb_out; 2691 struct sadb_msg *hdr; 2692 2693 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2694 if (!skb_out) 2695 return -ENOBUFS; 2696 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2697 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2698 hdr->sadb_msg_seq = c->seq; 2699 hdr->sadb_msg_pid = c->portid; 2700 hdr->sadb_msg_version = PF_KEY_V2; 2701 hdr->sadb_msg_errno = (uint8_t) 0; 2702 hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2703 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2704 hdr->sadb_msg_reserved = 0; 2705 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL, c->net); 2706 return 0; 2707 2708 } 2709 2710 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs) 2711 { 2712 struct net *net = sock_net(sk); 2713 struct km_event c; 2714 struct xfrm_audit audit_info; 2715 int err, err2; 2716 2717 audit_info.loginuid = audit_get_loginuid(current); 2718 audit_info.sessionid = audit_get_sessionid(current); 2719 audit_info.secid = 0; 2720 err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, &audit_info); 2721 err2 = unicast_flush_resp(sk, hdr); 2722 if (err || err2) { 2723 if (err == -ESRCH) /* empty table - old silent behavior */ 2724 return 0; 2725 return err; 2726 } 2727 2728 c.data.type = XFRM_POLICY_TYPE_MAIN; 2729 c.event = XFRM_MSG_FLUSHPOLICY; 2730 c.portid = hdr->sadb_msg_pid; 2731 c.seq = hdr->sadb_msg_seq; 2732 c.net = net; 2733 km_policy_notify(NULL, 0, &c); 2734 2735 return 0; 2736 } 2737 2738 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2739 const struct sadb_msg *hdr, void * const *ext_hdrs); 2740 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2741 [SADB_RESERVED] = pfkey_reserved, 2742 [SADB_GETSPI] = pfkey_getspi, 2743 [SADB_UPDATE] = pfkey_add, 2744 [SADB_ADD] = pfkey_add, 2745 [SADB_DELETE] = pfkey_delete, 2746 [SADB_GET] = pfkey_get, 2747 [SADB_ACQUIRE] = pfkey_acquire, 2748 [SADB_REGISTER] = pfkey_register, 2749 [SADB_EXPIRE] = NULL, 2750 [SADB_FLUSH] = pfkey_flush, 2751 [SADB_DUMP] = pfkey_dump, 2752 [SADB_X_PROMISC] = pfkey_promisc, 2753 [SADB_X_PCHANGE] = NULL, 2754 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2755 [SADB_X_SPDADD] = pfkey_spdadd, 2756 [SADB_X_SPDDELETE] = pfkey_spddelete, 2757 [SADB_X_SPDGET] = pfkey_spdget, 2758 [SADB_X_SPDACQUIRE] = NULL, 2759 [SADB_X_SPDDUMP] = pfkey_spddump, 2760 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2761 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2762 [SADB_X_SPDDELETE2] = pfkey_spdget, 2763 [SADB_X_MIGRATE] = pfkey_migrate, 2764 }; 2765 2766 static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr) 2767 { 2768 void *ext_hdrs[SADB_EXT_MAX]; 2769 int err; 2770 2771 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2772 BROADCAST_PROMISC_ONLY, NULL, sock_net(sk)); 2773 2774 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2775 err = parse_exthdrs(skb, hdr, ext_hdrs); 2776 if (!err) { 2777 err = -EOPNOTSUPP; 2778 if (pfkey_funcs[hdr->sadb_msg_type]) 2779 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2780 } 2781 return err; 2782 } 2783 2784 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2785 { 2786 struct sadb_msg *hdr = NULL; 2787 2788 if (skb->len < sizeof(*hdr)) { 2789 *errp = -EMSGSIZE; 2790 } else { 2791 hdr = (struct sadb_msg *) skb->data; 2792 if (hdr->sadb_msg_version != PF_KEY_V2 || 2793 hdr->sadb_msg_reserved != 0 || 2794 (hdr->sadb_msg_type <= SADB_RESERVED || 2795 hdr->sadb_msg_type > SADB_MAX)) { 2796 hdr = NULL; 2797 *errp = -EINVAL; 2798 } else if (hdr->sadb_msg_len != (skb->len / 2799 sizeof(uint64_t)) || 2800 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2801 sizeof(uint64_t))) { 2802 hdr = NULL; 2803 *errp = -EMSGSIZE; 2804 } else { 2805 *errp = 0; 2806 } 2807 } 2808 return hdr; 2809 } 2810 2811 static inline int aalg_tmpl_set(const struct xfrm_tmpl *t, 2812 const struct xfrm_algo_desc *d) 2813 { 2814 unsigned int id = d->desc.sadb_alg_id; 2815 2816 if (id >= sizeof(t->aalgos) * 8) 2817 return 0; 2818 2819 return (t->aalgos >> id) & 1; 2820 } 2821 2822 static inline int ealg_tmpl_set(const struct xfrm_tmpl *t, 2823 const struct xfrm_algo_desc *d) 2824 { 2825 unsigned int id = d->desc.sadb_alg_id; 2826 2827 if (id >= sizeof(t->ealgos) * 8) 2828 return 0; 2829 2830 return (t->ealgos >> id) & 1; 2831 } 2832 2833 static int count_ah_combs(const struct xfrm_tmpl *t) 2834 { 2835 int i, sz = 0; 2836 2837 for (i = 0; ; i++) { 2838 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2839 if (!aalg) 2840 break; 2841 if (!aalg->pfkey_supported) 2842 continue; 2843 if (aalg_tmpl_set(t, aalg) && aalg->available) 2844 sz += sizeof(struct sadb_comb); 2845 } 2846 return sz + sizeof(struct sadb_prop); 2847 } 2848 2849 static int count_esp_combs(const struct xfrm_tmpl *t) 2850 { 2851 int i, k, sz = 0; 2852 2853 for (i = 0; ; i++) { 2854 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2855 if (!ealg) 2856 break; 2857 2858 if (!ealg->pfkey_supported) 2859 continue; 2860 2861 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2862 continue; 2863 2864 for (k = 1; ; k++) { 2865 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2866 if (!aalg) 2867 break; 2868 2869 if (!aalg->pfkey_supported) 2870 continue; 2871 2872 if (aalg_tmpl_set(t, aalg) && aalg->available) 2873 sz += sizeof(struct sadb_comb); 2874 } 2875 } 2876 return sz + sizeof(struct sadb_prop); 2877 } 2878 2879 static void dump_ah_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2880 { 2881 struct sadb_prop *p; 2882 int i; 2883 2884 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2885 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2886 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2887 p->sadb_prop_replay = 32; 2888 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2889 2890 for (i = 0; ; i++) { 2891 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2892 if (!aalg) 2893 break; 2894 2895 if (!aalg->pfkey_supported) 2896 continue; 2897 2898 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2899 struct sadb_comb *c; 2900 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2901 memset(c, 0, sizeof(*c)); 2902 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2903 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2904 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2905 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2906 c->sadb_comb_hard_addtime = 24*60*60; 2907 c->sadb_comb_soft_addtime = 20*60*60; 2908 c->sadb_comb_hard_usetime = 8*60*60; 2909 c->sadb_comb_soft_usetime = 7*60*60; 2910 } 2911 } 2912 } 2913 2914 static void dump_esp_combs(struct sk_buff *skb, const struct xfrm_tmpl *t) 2915 { 2916 struct sadb_prop *p; 2917 int i, k; 2918 2919 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2920 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2921 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2922 p->sadb_prop_replay = 32; 2923 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2924 2925 for (i=0; ; i++) { 2926 const struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2927 if (!ealg) 2928 break; 2929 2930 if (!ealg->pfkey_supported) 2931 continue; 2932 2933 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2934 continue; 2935 2936 for (k = 1; ; k++) { 2937 struct sadb_comb *c; 2938 const struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2939 if (!aalg) 2940 break; 2941 if (!aalg->pfkey_supported) 2942 continue; 2943 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2944 continue; 2945 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2946 memset(c, 0, sizeof(*c)); 2947 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2948 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2949 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2950 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2951 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2952 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2953 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2954 c->sadb_comb_hard_addtime = 24*60*60; 2955 c->sadb_comb_soft_addtime = 20*60*60; 2956 c->sadb_comb_hard_usetime = 8*60*60; 2957 c->sadb_comb_soft_usetime = 7*60*60; 2958 } 2959 } 2960 } 2961 2962 static int key_notify_policy_expire(struct xfrm_policy *xp, const struct km_event *c) 2963 { 2964 return 0; 2965 } 2966 2967 static int key_notify_sa_expire(struct xfrm_state *x, const struct km_event *c) 2968 { 2969 struct sk_buff *out_skb; 2970 struct sadb_msg *out_hdr; 2971 int hard; 2972 int hsc; 2973 2974 hard = c->data.hard; 2975 if (hard) 2976 hsc = 2; 2977 else 2978 hsc = 1; 2979 2980 out_skb = pfkey_xfrm_state2msg_expire(x, hsc); 2981 if (IS_ERR(out_skb)) 2982 return PTR_ERR(out_skb); 2983 2984 out_hdr = (struct sadb_msg *) out_skb->data; 2985 out_hdr->sadb_msg_version = PF_KEY_V2; 2986 out_hdr->sadb_msg_type = SADB_EXPIRE; 2987 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2988 out_hdr->sadb_msg_errno = 0; 2989 out_hdr->sadb_msg_reserved = 0; 2990 out_hdr->sadb_msg_seq = 0; 2991 out_hdr->sadb_msg_pid = 0; 2992 2993 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 2994 return 0; 2995 } 2996 2997 static int pfkey_send_notify(struct xfrm_state *x, const struct km_event *c) 2998 { 2999 struct net *net = x ? xs_net(x) : c->net; 3000 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3001 3002 if (atomic_read(&net_pfkey->socks_nr) == 0) 3003 return 0; 3004 3005 switch (c->event) { 3006 case XFRM_MSG_EXPIRE: 3007 return key_notify_sa_expire(x, c); 3008 case XFRM_MSG_DELSA: 3009 case XFRM_MSG_NEWSA: 3010 case XFRM_MSG_UPDSA: 3011 return key_notify_sa(x, c); 3012 case XFRM_MSG_FLUSHSA: 3013 return key_notify_sa_flush(c); 3014 case XFRM_MSG_NEWAE: /* not yet supported */ 3015 break; 3016 default: 3017 pr_err("pfkey: Unknown SA event %d\n", c->event); 3018 break; 3019 } 3020 3021 return 0; 3022 } 3023 3024 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c) 3025 { 3026 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 3027 return 0; 3028 3029 switch (c->event) { 3030 case XFRM_MSG_POLEXPIRE: 3031 return key_notify_policy_expire(xp, c); 3032 case XFRM_MSG_DELPOLICY: 3033 case XFRM_MSG_NEWPOLICY: 3034 case XFRM_MSG_UPDPOLICY: 3035 return key_notify_policy(xp, dir, c); 3036 case XFRM_MSG_FLUSHPOLICY: 3037 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 3038 break; 3039 return key_notify_policy_flush(c); 3040 default: 3041 pr_err("pfkey: Unknown policy event %d\n", c->event); 3042 break; 3043 } 3044 3045 return 0; 3046 } 3047 3048 static u32 get_acqseq(void) 3049 { 3050 u32 res; 3051 static atomic_t acqseq; 3052 3053 do { 3054 res = atomic_inc_return(&acqseq); 3055 } while (!res); 3056 return res; 3057 } 3058 3059 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp) 3060 { 3061 struct sk_buff *skb; 3062 struct sadb_msg *hdr; 3063 struct sadb_address *addr; 3064 struct sadb_x_policy *pol; 3065 int sockaddr_size; 3066 int size; 3067 struct sadb_x_sec_ctx *sec_ctx; 3068 struct xfrm_sec_ctx *xfrm_ctx; 3069 int ctx_size = 0; 3070 3071 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3072 if (!sockaddr_size) 3073 return -EINVAL; 3074 3075 size = sizeof(struct sadb_msg) + 3076 (sizeof(struct sadb_address) * 2) + 3077 (sockaddr_size * 2) + 3078 sizeof(struct sadb_x_policy); 3079 3080 if (x->id.proto == IPPROTO_AH) 3081 size += count_ah_combs(t); 3082 else if (x->id.proto == IPPROTO_ESP) 3083 size += count_esp_combs(t); 3084 3085 if ((xfrm_ctx = x->security)) { 3086 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 3087 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 3088 } 3089 3090 skb = alloc_skb(size + 16, GFP_ATOMIC); 3091 if (skb == NULL) 3092 return -ENOMEM; 3093 3094 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3095 hdr->sadb_msg_version = PF_KEY_V2; 3096 hdr->sadb_msg_type = SADB_ACQUIRE; 3097 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 3098 hdr->sadb_msg_len = size / sizeof(uint64_t); 3099 hdr->sadb_msg_errno = 0; 3100 hdr->sadb_msg_reserved = 0; 3101 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3102 hdr->sadb_msg_pid = 0; 3103 3104 /* src address */ 3105 addr = (struct sadb_address*) skb_put(skb, 3106 sizeof(struct sadb_address)+sockaddr_size); 3107 addr->sadb_address_len = 3108 (sizeof(struct sadb_address)+sockaddr_size)/ 3109 sizeof(uint64_t); 3110 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3111 addr->sadb_address_proto = 0; 3112 addr->sadb_address_reserved = 0; 3113 addr->sadb_address_prefixlen = 3114 pfkey_sockaddr_fill(&x->props.saddr, 0, 3115 (struct sockaddr *) (addr + 1), 3116 x->props.family); 3117 if (!addr->sadb_address_prefixlen) 3118 BUG(); 3119 3120 /* dst address */ 3121 addr = (struct sadb_address*) skb_put(skb, 3122 sizeof(struct sadb_address)+sockaddr_size); 3123 addr->sadb_address_len = 3124 (sizeof(struct sadb_address)+sockaddr_size)/ 3125 sizeof(uint64_t); 3126 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3127 addr->sadb_address_proto = 0; 3128 addr->sadb_address_reserved = 0; 3129 addr->sadb_address_prefixlen = 3130 pfkey_sockaddr_fill(&x->id.daddr, 0, 3131 (struct sockaddr *) (addr + 1), 3132 x->props.family); 3133 if (!addr->sadb_address_prefixlen) 3134 BUG(); 3135 3136 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3137 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3138 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3139 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3140 pol->sadb_x_policy_dir = XFRM_POLICY_OUT + 1; 3141 pol->sadb_x_policy_reserved = 0; 3142 pol->sadb_x_policy_id = xp->index; 3143 pol->sadb_x_policy_priority = xp->priority; 3144 3145 /* Set sadb_comb's. */ 3146 if (x->id.proto == IPPROTO_AH) 3147 dump_ah_combs(skb, t); 3148 else if (x->id.proto == IPPROTO_ESP) 3149 dump_esp_combs(skb, t); 3150 3151 /* security context */ 3152 if (xfrm_ctx) { 3153 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3154 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3155 sec_ctx->sadb_x_sec_len = 3156 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3157 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3158 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3159 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3160 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3161 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3162 xfrm_ctx->ctx_len); 3163 } 3164 3165 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3166 } 3167 3168 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3169 u8 *data, int len, int *dir) 3170 { 3171 struct net *net = sock_net(sk); 3172 struct xfrm_policy *xp; 3173 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3174 struct sadb_x_sec_ctx *sec_ctx; 3175 3176 switch (sk->sk_family) { 3177 case AF_INET: 3178 if (opt != IP_IPSEC_POLICY) { 3179 *dir = -EOPNOTSUPP; 3180 return NULL; 3181 } 3182 break; 3183 #if IS_ENABLED(CONFIG_IPV6) 3184 case AF_INET6: 3185 if (opt != IPV6_IPSEC_POLICY) { 3186 *dir = -EOPNOTSUPP; 3187 return NULL; 3188 } 3189 break; 3190 #endif 3191 default: 3192 *dir = -EINVAL; 3193 return NULL; 3194 } 3195 3196 *dir = -EINVAL; 3197 3198 if (len < sizeof(struct sadb_x_policy) || 3199 pol->sadb_x_policy_len*8 > len || 3200 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3201 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3202 return NULL; 3203 3204 xp = xfrm_policy_alloc(net, GFP_ATOMIC); 3205 if (xp == NULL) { 3206 *dir = -ENOBUFS; 3207 return NULL; 3208 } 3209 3210 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3211 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3212 3213 xp->lft.soft_byte_limit = XFRM_INF; 3214 xp->lft.hard_byte_limit = XFRM_INF; 3215 xp->lft.soft_packet_limit = XFRM_INF; 3216 xp->lft.hard_packet_limit = XFRM_INF; 3217 xp->family = sk->sk_family; 3218 3219 xp->xfrm_nr = 0; 3220 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3221 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3222 goto out; 3223 3224 /* security context too */ 3225 if (len >= (pol->sadb_x_policy_len*8 + 3226 sizeof(struct sadb_x_sec_ctx))) { 3227 char *p = (char *)pol; 3228 struct xfrm_user_sec_ctx *uctx; 3229 3230 p += pol->sadb_x_policy_len*8; 3231 sec_ctx = (struct sadb_x_sec_ctx *)p; 3232 if (len < pol->sadb_x_policy_len*8 + 3233 sec_ctx->sadb_x_sec_len) { 3234 *dir = -EINVAL; 3235 goto out; 3236 } 3237 if ((*dir = verify_sec_ctx_len(p))) 3238 goto out; 3239 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3240 *dir = security_xfrm_policy_alloc(&xp->security, uctx); 3241 kfree(uctx); 3242 3243 if (*dir) 3244 goto out; 3245 } 3246 3247 *dir = pol->sadb_x_policy_dir-1; 3248 return xp; 3249 3250 out: 3251 xp->walk.dead = 1; 3252 xfrm_policy_destroy(xp); 3253 return NULL; 3254 } 3255 3256 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3257 { 3258 struct sk_buff *skb; 3259 struct sadb_msg *hdr; 3260 struct sadb_sa *sa; 3261 struct sadb_address *addr; 3262 struct sadb_x_nat_t_port *n_port; 3263 int sockaddr_size; 3264 int size; 3265 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3266 struct xfrm_encap_tmpl *natt = NULL; 3267 3268 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3269 if (!sockaddr_size) 3270 return -EINVAL; 3271 3272 if (!satype) 3273 return -EINVAL; 3274 3275 if (!x->encap) 3276 return -EINVAL; 3277 3278 natt = x->encap; 3279 3280 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3281 * 3282 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3283 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3284 */ 3285 3286 size = sizeof(struct sadb_msg) + 3287 sizeof(struct sadb_sa) + 3288 (sizeof(struct sadb_address) * 2) + 3289 (sockaddr_size * 2) + 3290 (sizeof(struct sadb_x_nat_t_port) * 2); 3291 3292 skb = alloc_skb(size + 16, GFP_ATOMIC); 3293 if (skb == NULL) 3294 return -ENOMEM; 3295 3296 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3297 hdr->sadb_msg_version = PF_KEY_V2; 3298 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3299 hdr->sadb_msg_satype = satype; 3300 hdr->sadb_msg_len = size / sizeof(uint64_t); 3301 hdr->sadb_msg_errno = 0; 3302 hdr->sadb_msg_reserved = 0; 3303 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3304 hdr->sadb_msg_pid = 0; 3305 3306 /* SA */ 3307 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3308 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3309 sa->sadb_sa_exttype = SADB_EXT_SA; 3310 sa->sadb_sa_spi = x->id.spi; 3311 sa->sadb_sa_replay = 0; 3312 sa->sadb_sa_state = 0; 3313 sa->sadb_sa_auth = 0; 3314 sa->sadb_sa_encrypt = 0; 3315 sa->sadb_sa_flags = 0; 3316 3317 /* ADDRESS_SRC (old addr) */ 3318 addr = (struct sadb_address*) 3319 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3320 addr->sadb_address_len = 3321 (sizeof(struct sadb_address)+sockaddr_size)/ 3322 sizeof(uint64_t); 3323 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3324 addr->sadb_address_proto = 0; 3325 addr->sadb_address_reserved = 0; 3326 addr->sadb_address_prefixlen = 3327 pfkey_sockaddr_fill(&x->props.saddr, 0, 3328 (struct sockaddr *) (addr + 1), 3329 x->props.family); 3330 if (!addr->sadb_address_prefixlen) 3331 BUG(); 3332 3333 /* NAT_T_SPORT (old port) */ 3334 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3335 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3336 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3337 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3338 n_port->sadb_x_nat_t_port_reserved = 0; 3339 3340 /* ADDRESS_DST (new addr) */ 3341 addr = (struct sadb_address*) 3342 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3343 addr->sadb_address_len = 3344 (sizeof(struct sadb_address)+sockaddr_size)/ 3345 sizeof(uint64_t); 3346 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3347 addr->sadb_address_proto = 0; 3348 addr->sadb_address_reserved = 0; 3349 addr->sadb_address_prefixlen = 3350 pfkey_sockaddr_fill(ipaddr, 0, 3351 (struct sockaddr *) (addr + 1), 3352 x->props.family); 3353 if (!addr->sadb_address_prefixlen) 3354 BUG(); 3355 3356 /* NAT_T_DPORT (new port) */ 3357 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3358 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3359 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3360 n_port->sadb_x_nat_t_port_port = sport; 3361 n_port->sadb_x_nat_t_port_reserved = 0; 3362 3363 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL, xs_net(x)); 3364 } 3365 3366 #ifdef CONFIG_NET_KEY_MIGRATE 3367 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3368 const struct xfrm_selector *sel) 3369 { 3370 struct sadb_address *addr; 3371 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3372 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3373 addr->sadb_address_exttype = type; 3374 addr->sadb_address_proto = sel->proto; 3375 addr->sadb_address_reserved = 0; 3376 3377 switch (type) { 3378 case SADB_EXT_ADDRESS_SRC: 3379 addr->sadb_address_prefixlen = sel->prefixlen_s; 3380 pfkey_sockaddr_fill(&sel->saddr, 0, 3381 (struct sockaddr *)(addr + 1), 3382 sel->family); 3383 break; 3384 case SADB_EXT_ADDRESS_DST: 3385 addr->sadb_address_prefixlen = sel->prefixlen_d; 3386 pfkey_sockaddr_fill(&sel->daddr, 0, 3387 (struct sockaddr *)(addr + 1), 3388 sel->family); 3389 break; 3390 default: 3391 return -EINVAL; 3392 } 3393 3394 return 0; 3395 } 3396 3397 3398 static int set_sadb_kmaddress(struct sk_buff *skb, const struct xfrm_kmaddress *k) 3399 { 3400 struct sadb_x_kmaddress *kma; 3401 u8 *sa; 3402 int family = k->family; 3403 int socklen = pfkey_sockaddr_len(family); 3404 int size_req; 3405 3406 size_req = (sizeof(struct sadb_x_kmaddress) + 3407 pfkey_sockaddr_pair_size(family)); 3408 3409 kma = (struct sadb_x_kmaddress *)skb_put(skb, size_req); 3410 memset(kma, 0, size_req); 3411 kma->sadb_x_kmaddress_len = size_req / 8; 3412 kma->sadb_x_kmaddress_exttype = SADB_X_EXT_KMADDRESS; 3413 kma->sadb_x_kmaddress_reserved = k->reserved; 3414 3415 sa = (u8 *)(kma + 1); 3416 if (!pfkey_sockaddr_fill(&k->local, 0, (struct sockaddr *)sa, family) || 3417 !pfkey_sockaddr_fill(&k->remote, 0, (struct sockaddr *)(sa+socklen), family)) 3418 return -EINVAL; 3419 3420 return 0; 3421 } 3422 3423 static int set_ipsecrequest(struct sk_buff *skb, 3424 uint8_t proto, uint8_t mode, int level, 3425 uint32_t reqid, uint8_t family, 3426 const xfrm_address_t *src, const xfrm_address_t *dst) 3427 { 3428 struct sadb_x_ipsecrequest *rq; 3429 u8 *sa; 3430 int socklen = pfkey_sockaddr_len(family); 3431 int size_req; 3432 3433 size_req = sizeof(struct sadb_x_ipsecrequest) + 3434 pfkey_sockaddr_pair_size(family); 3435 3436 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3437 memset(rq, 0, size_req); 3438 rq->sadb_x_ipsecrequest_len = size_req; 3439 rq->sadb_x_ipsecrequest_proto = proto; 3440 rq->sadb_x_ipsecrequest_mode = mode; 3441 rq->sadb_x_ipsecrequest_level = level; 3442 rq->sadb_x_ipsecrequest_reqid = reqid; 3443 3444 sa = (u8 *) (rq + 1); 3445 if (!pfkey_sockaddr_fill(src, 0, (struct sockaddr *)sa, family) || 3446 !pfkey_sockaddr_fill(dst, 0, (struct sockaddr *)(sa + socklen), family)) 3447 return -EINVAL; 3448 3449 return 0; 3450 } 3451 #endif 3452 3453 #ifdef CONFIG_NET_KEY_MIGRATE 3454 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3455 const struct xfrm_migrate *m, int num_bundles, 3456 const struct xfrm_kmaddress *k) 3457 { 3458 int i; 3459 int sasize_sel; 3460 int size = 0; 3461 int size_pol = 0; 3462 struct sk_buff *skb; 3463 struct sadb_msg *hdr; 3464 struct sadb_x_policy *pol; 3465 const struct xfrm_migrate *mp; 3466 3467 if (type != XFRM_POLICY_TYPE_MAIN) 3468 return 0; 3469 3470 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3471 return -EINVAL; 3472 3473 if (k != NULL) { 3474 /* addresses for KM */ 3475 size += PFKEY_ALIGN8(sizeof(struct sadb_x_kmaddress) + 3476 pfkey_sockaddr_pair_size(k->family)); 3477 } 3478 3479 /* selector */ 3480 sasize_sel = pfkey_sockaddr_size(sel->family); 3481 if (!sasize_sel) 3482 return -EINVAL; 3483 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3484 3485 /* policy info */ 3486 size_pol += sizeof(struct sadb_x_policy); 3487 3488 /* ipsecrequests */ 3489 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3490 /* old locator pair */ 3491 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3492 pfkey_sockaddr_pair_size(mp->old_family); 3493 /* new locator pair */ 3494 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3495 pfkey_sockaddr_pair_size(mp->new_family); 3496 } 3497 3498 size += sizeof(struct sadb_msg) + size_pol; 3499 3500 /* alloc buffer */ 3501 skb = alloc_skb(size, GFP_ATOMIC); 3502 if (skb == NULL) 3503 return -ENOMEM; 3504 3505 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3506 hdr->sadb_msg_version = PF_KEY_V2; 3507 hdr->sadb_msg_type = SADB_X_MIGRATE; 3508 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3509 hdr->sadb_msg_len = size / 8; 3510 hdr->sadb_msg_errno = 0; 3511 hdr->sadb_msg_reserved = 0; 3512 hdr->sadb_msg_seq = 0; 3513 hdr->sadb_msg_pid = 0; 3514 3515 /* Addresses to be used by KM for negotiation, if ext is available */ 3516 if (k != NULL && (set_sadb_kmaddress(skb, k) < 0)) 3517 goto err; 3518 3519 /* selector src */ 3520 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3521 3522 /* selector dst */ 3523 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3524 3525 /* policy information */ 3526 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3527 pol->sadb_x_policy_len = size_pol / 8; 3528 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3529 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3530 pol->sadb_x_policy_dir = dir + 1; 3531 pol->sadb_x_policy_reserved = 0; 3532 pol->sadb_x_policy_id = 0; 3533 pol->sadb_x_policy_priority = 0; 3534 3535 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3536 /* old ipsecrequest */ 3537 int mode = pfkey_mode_from_xfrm(mp->mode); 3538 if (mode < 0) 3539 goto err; 3540 if (set_ipsecrequest(skb, mp->proto, mode, 3541 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3542 mp->reqid, mp->old_family, 3543 &mp->old_saddr, &mp->old_daddr) < 0) 3544 goto err; 3545 3546 /* new ipsecrequest */ 3547 if (set_ipsecrequest(skb, mp->proto, mode, 3548 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3549 mp->reqid, mp->new_family, 3550 &mp->new_saddr, &mp->new_daddr) < 0) 3551 goto err; 3552 } 3553 3554 /* broadcast migrate message to sockets */ 3555 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL, &init_net); 3556 3557 return 0; 3558 3559 err: 3560 kfree_skb(skb); 3561 return -EINVAL; 3562 } 3563 #else 3564 static int pfkey_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type, 3565 const struct xfrm_migrate *m, int num_bundles, 3566 const struct xfrm_kmaddress *k) 3567 { 3568 return -ENOPROTOOPT; 3569 } 3570 #endif 3571 3572 static int pfkey_sendmsg(struct kiocb *kiocb, 3573 struct socket *sock, struct msghdr *msg, size_t len) 3574 { 3575 struct sock *sk = sock->sk; 3576 struct sk_buff *skb = NULL; 3577 struct sadb_msg *hdr = NULL; 3578 int err; 3579 3580 err = -EOPNOTSUPP; 3581 if (msg->msg_flags & MSG_OOB) 3582 goto out; 3583 3584 err = -EMSGSIZE; 3585 if ((unsigned int)len > sk->sk_sndbuf - 32) 3586 goto out; 3587 3588 err = -ENOBUFS; 3589 skb = alloc_skb(len, GFP_KERNEL); 3590 if (skb == NULL) 3591 goto out; 3592 3593 err = -EFAULT; 3594 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3595 goto out; 3596 3597 hdr = pfkey_get_base_msg(skb, &err); 3598 if (!hdr) 3599 goto out; 3600 3601 mutex_lock(&xfrm_cfg_mutex); 3602 err = pfkey_process(sk, skb, hdr); 3603 mutex_unlock(&xfrm_cfg_mutex); 3604 3605 out: 3606 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3607 err = 0; 3608 kfree_skb(skb); 3609 3610 return err ? : len; 3611 } 3612 3613 static int pfkey_recvmsg(struct kiocb *kiocb, 3614 struct socket *sock, struct msghdr *msg, size_t len, 3615 int flags) 3616 { 3617 struct sock *sk = sock->sk; 3618 struct pfkey_sock *pfk = pfkey_sk(sk); 3619 struct sk_buff *skb; 3620 int copied, err; 3621 3622 err = -EINVAL; 3623 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3624 goto out; 3625 3626 msg->msg_namelen = 0; 3627 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3628 if (skb == NULL) 3629 goto out; 3630 3631 copied = skb->len; 3632 if (copied > len) { 3633 msg->msg_flags |= MSG_TRUNC; 3634 copied = len; 3635 } 3636 3637 skb_reset_transport_header(skb); 3638 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3639 if (err) 3640 goto out_free; 3641 3642 sock_recv_ts_and_drops(msg, sk, skb); 3643 3644 err = (flags & MSG_TRUNC) ? skb->len : copied; 3645 3646 if (pfk->dump.dump != NULL && 3647 3 * atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) 3648 pfkey_do_dump(pfk); 3649 3650 out_free: 3651 skb_free_datagram(sk, skb); 3652 out: 3653 return err; 3654 } 3655 3656 static const struct proto_ops pfkey_ops = { 3657 .family = PF_KEY, 3658 .owner = THIS_MODULE, 3659 /* Operations that make no sense on pfkey sockets. */ 3660 .bind = sock_no_bind, 3661 .connect = sock_no_connect, 3662 .socketpair = sock_no_socketpair, 3663 .accept = sock_no_accept, 3664 .getname = sock_no_getname, 3665 .ioctl = sock_no_ioctl, 3666 .listen = sock_no_listen, 3667 .shutdown = sock_no_shutdown, 3668 .setsockopt = sock_no_setsockopt, 3669 .getsockopt = sock_no_getsockopt, 3670 .mmap = sock_no_mmap, 3671 .sendpage = sock_no_sendpage, 3672 3673 /* Now the operations that really occur. */ 3674 .release = pfkey_release, 3675 .poll = datagram_poll, 3676 .sendmsg = pfkey_sendmsg, 3677 .recvmsg = pfkey_recvmsg, 3678 }; 3679 3680 static const struct net_proto_family pfkey_family_ops = { 3681 .family = PF_KEY, 3682 .create = pfkey_create, 3683 .owner = THIS_MODULE, 3684 }; 3685 3686 #ifdef CONFIG_PROC_FS 3687 static int pfkey_seq_show(struct seq_file *f, void *v) 3688 { 3689 struct sock *s = sk_entry(v); 3690 3691 if (v == SEQ_START_TOKEN) 3692 seq_printf(f ,"sk RefCnt Rmem Wmem User Inode\n"); 3693 else 3694 seq_printf(f, "%pK %-6d %-6u %-6u %-6u %-6lu\n", 3695 s, 3696 atomic_read(&s->sk_refcnt), 3697 sk_rmem_alloc_get(s), 3698 sk_wmem_alloc_get(s), 3699 from_kuid_munged(seq_user_ns(f), sock_i_uid(s)), 3700 sock_i_ino(s) 3701 ); 3702 return 0; 3703 } 3704 3705 static void *pfkey_seq_start(struct seq_file *f, loff_t *ppos) 3706 __acquires(rcu) 3707 { 3708 struct net *net = seq_file_net(f); 3709 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3710 3711 rcu_read_lock(); 3712 return seq_hlist_start_head_rcu(&net_pfkey->table, *ppos); 3713 } 3714 3715 static void *pfkey_seq_next(struct seq_file *f, void *v, loff_t *ppos) 3716 { 3717 struct net *net = seq_file_net(f); 3718 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3719 3720 return seq_hlist_next_rcu(v, &net_pfkey->table, ppos); 3721 } 3722 3723 static void pfkey_seq_stop(struct seq_file *f, void *v) 3724 __releases(rcu) 3725 { 3726 rcu_read_unlock(); 3727 } 3728 3729 static const struct seq_operations pfkey_seq_ops = { 3730 .start = pfkey_seq_start, 3731 .next = pfkey_seq_next, 3732 .stop = pfkey_seq_stop, 3733 .show = pfkey_seq_show, 3734 }; 3735 3736 static int pfkey_seq_open(struct inode *inode, struct file *file) 3737 { 3738 return seq_open_net(inode, file, &pfkey_seq_ops, 3739 sizeof(struct seq_net_private)); 3740 } 3741 3742 static const struct file_operations pfkey_proc_ops = { 3743 .open = pfkey_seq_open, 3744 .read = seq_read, 3745 .llseek = seq_lseek, 3746 .release = seq_release_net, 3747 }; 3748 3749 static int __net_init pfkey_init_proc(struct net *net) 3750 { 3751 struct proc_dir_entry *e; 3752 3753 e = proc_create("pfkey", 0, net->proc_net, &pfkey_proc_ops); 3754 if (e == NULL) 3755 return -ENOMEM; 3756 3757 return 0; 3758 } 3759 3760 static void __net_exit pfkey_exit_proc(struct net *net) 3761 { 3762 remove_proc_entry("pfkey", net->proc_net); 3763 } 3764 #else 3765 static inline int pfkey_init_proc(struct net *net) 3766 { 3767 return 0; 3768 } 3769 3770 static inline void pfkey_exit_proc(struct net *net) 3771 { 3772 } 3773 #endif 3774 3775 static struct xfrm_mgr pfkeyv2_mgr = 3776 { 3777 .id = "pfkeyv2", 3778 .notify = pfkey_send_notify, 3779 .acquire = pfkey_send_acquire, 3780 .compile_policy = pfkey_compile_policy, 3781 .new_mapping = pfkey_send_new_mapping, 3782 .notify_policy = pfkey_send_policy_notify, 3783 .migrate = pfkey_send_migrate, 3784 }; 3785 3786 static int __net_init pfkey_net_init(struct net *net) 3787 { 3788 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3789 int rv; 3790 3791 INIT_HLIST_HEAD(&net_pfkey->table); 3792 atomic_set(&net_pfkey->socks_nr, 0); 3793 3794 rv = pfkey_init_proc(net); 3795 3796 return rv; 3797 } 3798 3799 static void __net_exit pfkey_net_exit(struct net *net) 3800 { 3801 struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id); 3802 3803 pfkey_exit_proc(net); 3804 BUG_ON(!hlist_empty(&net_pfkey->table)); 3805 } 3806 3807 static struct pernet_operations pfkey_net_ops = { 3808 .init = pfkey_net_init, 3809 .exit = pfkey_net_exit, 3810 .id = &pfkey_net_id, 3811 .size = sizeof(struct netns_pfkey), 3812 }; 3813 3814 static void __exit ipsec_pfkey_exit(void) 3815 { 3816 xfrm_unregister_km(&pfkeyv2_mgr); 3817 sock_unregister(PF_KEY); 3818 unregister_pernet_subsys(&pfkey_net_ops); 3819 proto_unregister(&key_proto); 3820 } 3821 3822 static int __init ipsec_pfkey_init(void) 3823 { 3824 int err = proto_register(&key_proto, 0); 3825 3826 if (err != 0) 3827 goto out; 3828 3829 err = register_pernet_subsys(&pfkey_net_ops); 3830 if (err != 0) 3831 goto out_unregister_key_proto; 3832 err = sock_register(&pfkey_family_ops); 3833 if (err != 0) 3834 goto out_unregister_pernet; 3835 err = xfrm_register_km(&pfkeyv2_mgr); 3836 if (err != 0) 3837 goto out_sock_unregister; 3838 out: 3839 return err; 3840 3841 out_sock_unregister: 3842 sock_unregister(PF_KEY); 3843 out_unregister_pernet: 3844 unregister_pernet_subsys(&pfkey_net_ops); 3845 out_unregister_key_proto: 3846 proto_unregister(&key_proto); 3847 goto out; 3848 } 3849 3850 module_init(ipsec_pfkey_init); 3851 module_exit(ipsec_pfkey_exit); 3852 MODULE_LICENSE("GPL"); 3853 MODULE_ALIAS_NETPROTO(PF_KEY); 3854