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 <net/xfrm.h> 30 #include <linux/audit.h> 31 32 #include <net/sock.h> 33 34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 36 37 38 /* List of all pfkey sockets. */ 39 static HLIST_HEAD(pfkey_table); 40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); 41 static DEFINE_RWLOCK(pfkey_table_lock); 42 static atomic_t pfkey_table_users = ATOMIC_INIT(0); 43 44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); 45 46 struct pfkey_sock { 47 /* struct sock must be the first member of struct pfkey_sock */ 48 struct sock sk; 49 int registered; 50 int promisc; 51 }; 52 53 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 54 { 55 return (struct pfkey_sock *)sk; 56 } 57 58 static void pfkey_sock_destruct(struct sock *sk) 59 { 60 skb_queue_purge(&sk->sk_receive_queue); 61 62 if (!sock_flag(sk, SOCK_DEAD)) { 63 printk("Attempt to release alive pfkey socket: %p\n", sk); 64 return; 65 } 66 67 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 68 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 69 70 atomic_dec(&pfkey_socks_nr); 71 } 72 73 static void pfkey_table_grab(void) 74 { 75 write_lock_bh(&pfkey_table_lock); 76 77 if (atomic_read(&pfkey_table_users)) { 78 DECLARE_WAITQUEUE(wait, current); 79 80 add_wait_queue_exclusive(&pfkey_table_wait, &wait); 81 for(;;) { 82 set_current_state(TASK_UNINTERRUPTIBLE); 83 if (atomic_read(&pfkey_table_users) == 0) 84 break; 85 write_unlock_bh(&pfkey_table_lock); 86 schedule(); 87 write_lock_bh(&pfkey_table_lock); 88 } 89 90 __set_current_state(TASK_RUNNING); 91 remove_wait_queue(&pfkey_table_wait, &wait); 92 } 93 } 94 95 static __inline__ void pfkey_table_ungrab(void) 96 { 97 write_unlock_bh(&pfkey_table_lock); 98 wake_up(&pfkey_table_wait); 99 } 100 101 static __inline__ void pfkey_lock_table(void) 102 { 103 /* read_lock() synchronizes us to pfkey_table_grab */ 104 105 read_lock(&pfkey_table_lock); 106 atomic_inc(&pfkey_table_users); 107 read_unlock(&pfkey_table_lock); 108 } 109 110 static __inline__ void pfkey_unlock_table(void) 111 { 112 if (atomic_dec_and_test(&pfkey_table_users)) 113 wake_up(&pfkey_table_wait); 114 } 115 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 pfkey_table_grab(); 122 sk_add_node(sk, &pfkey_table); 123 pfkey_table_ungrab(); 124 } 125 126 static void pfkey_remove(struct sock *sk) 127 { 128 pfkey_table_grab(); 129 sk_del_node_init(sk); 130 pfkey_table_ungrab(); 131 } 132 133 static struct proto key_proto = { 134 .name = "KEY", 135 .owner = THIS_MODULE, 136 .obj_size = sizeof(struct pfkey_sock), 137 }; 138 139 static int pfkey_create(struct socket *sock, int protocol) 140 { 141 struct sock *sk; 142 int err; 143 144 if (!capable(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(PF_KEY, GFP_KERNEL, &key_proto, 1); 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(&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 sock_put(sk); 184 185 return 0; 186 } 187 188 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 189 gfp_t allocation, struct sock *sk) 190 { 191 int err = -ENOBUFS; 192 193 sock_hold(sk); 194 if (*skb2 == NULL) { 195 if (atomic_read(&skb->users) != 1) { 196 *skb2 = skb_clone(skb, allocation); 197 } else { 198 *skb2 = skb; 199 atomic_inc(&skb->users); 200 } 201 } 202 if (*skb2 != NULL) { 203 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 204 skb_orphan(*skb2); 205 skb_set_owner_r(*skb2, sk); 206 skb_queue_tail(&sk->sk_receive_queue, *skb2); 207 sk->sk_data_ready(sk, (*skb2)->len); 208 *skb2 = NULL; 209 err = 0; 210 } 211 } 212 sock_put(sk); 213 return err; 214 } 215 216 /* Send SKB to all pfkey sockets matching selected criteria. */ 217 #define BROADCAST_ALL 0 218 #define BROADCAST_ONE 1 219 #define BROADCAST_REGISTERED 2 220 #define BROADCAST_PROMISC_ONLY 4 221 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 222 int broadcast_flags, struct sock *one_sk) 223 { 224 struct sock *sk; 225 struct hlist_node *node; 226 struct sk_buff *skb2 = NULL; 227 int err = -ESRCH; 228 229 /* XXX Do we need something like netlink_overrun? I think 230 * XXX PF_KEY socket apps will not mind current behavior. 231 */ 232 if (!skb) 233 return -ENOMEM; 234 235 pfkey_lock_table(); 236 sk_for_each(sk, node, &pfkey_table) { 237 struct pfkey_sock *pfk = pfkey_sk(sk); 238 int err2; 239 240 /* Yes, it means that if you are meant to receive this 241 * pfkey message you receive it twice as promiscuous 242 * socket. 243 */ 244 if (pfk->promisc) 245 pfkey_broadcast_one(skb, &skb2, allocation, sk); 246 247 /* the exact target will be processed later */ 248 if (sk == one_sk) 249 continue; 250 if (broadcast_flags != BROADCAST_ALL) { 251 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 252 continue; 253 if ((broadcast_flags & BROADCAST_REGISTERED) && 254 !pfk->registered) 255 continue; 256 if (broadcast_flags & BROADCAST_ONE) 257 continue; 258 } 259 260 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 261 262 /* Error is cleare after succecful sending to at least one 263 * registered KM */ 264 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 265 err = err2; 266 } 267 pfkey_unlock_table(); 268 269 if (one_sk != NULL) 270 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 271 272 if (skb2) 273 kfree_skb(skb2); 274 kfree_skb(skb); 275 return err; 276 } 277 278 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) 279 { 280 *new = *orig; 281 } 282 283 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) 284 { 285 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 286 struct sadb_msg *hdr; 287 288 if (!skb) 289 return -ENOBUFS; 290 291 /* Woe be to the platform trying to support PFKEY yet 292 * having normal errnos outside the 1-255 range, inclusive. 293 */ 294 err = -err; 295 if (err == ERESTARTSYS || 296 err == ERESTARTNOHAND || 297 err == ERESTARTNOINTR) 298 err = EINTR; 299 if (err >= 512) 300 err = EINVAL; 301 BUG_ON(err <= 0 || err >= 256); 302 303 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 304 pfkey_hdr_dup(hdr, orig); 305 hdr->sadb_msg_errno = (uint8_t) err; 306 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 307 sizeof(uint64_t)); 308 309 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); 310 311 return 0; 312 } 313 314 static u8 sadb_ext_min_len[] = { 315 [SADB_EXT_RESERVED] = (u8) 0, 316 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 317 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 318 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 319 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 320 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 321 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 322 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 323 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 324 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 325 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 326 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 327 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 328 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 329 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 330 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 331 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 332 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 333 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 334 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 335 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 336 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 337 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 338 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 339 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 340 }; 341 342 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 343 static int verify_address_len(void *p) 344 { 345 struct sadb_address *sp = p; 346 struct sockaddr *addr = (struct sockaddr *)(sp + 1); 347 struct sockaddr_in *sin; 348 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 349 struct sockaddr_in6 *sin6; 350 #endif 351 int len; 352 353 switch (addr->sa_family) { 354 case AF_INET: 355 len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); 356 len /= sizeof(uint64_t); 357 if (sp->sadb_address_len != len || 358 sp->sadb_address_prefixlen > 32) 359 return -EINVAL; 360 break; 361 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 362 case AF_INET6: 363 len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); 364 len /= sizeof(uint64_t); 365 if (sp->sadb_address_len != len || 366 sp->sadb_address_prefixlen > 128) 367 return -EINVAL; 368 break; 369 #endif 370 default: 371 /* It is user using kernel to keep track of security 372 * associations for another protocol, such as 373 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 374 * lengths. 375 * 376 * XXX Actually, association/policy database is not yet 377 * XXX able to cope with arbitrary sockaddr families. 378 * XXX When it can, remove this -EINVAL. -DaveM 379 */ 380 return -EINVAL; 381 break; 382 }; 383 384 return 0; 385 } 386 387 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) 388 { 389 int len = 0; 390 391 len += sizeof(struct sadb_x_sec_ctx); 392 len += sec_ctx->sadb_x_ctx_len; 393 len += sizeof(uint64_t) - 1; 394 len /= sizeof(uint64_t); 395 396 return len; 397 } 398 399 static inline int verify_sec_ctx_len(void *p) 400 { 401 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; 402 int len; 403 404 if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE) 405 return -EINVAL; 406 407 len = pfkey_sec_ctx_len(sec_ctx); 408 409 if (sec_ctx->sadb_x_sec_len != len) 410 return -EINVAL; 411 412 return 0; 413 } 414 415 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) 416 { 417 struct xfrm_user_sec_ctx *uctx = NULL; 418 int ctx_size = sec_ctx->sadb_x_ctx_len; 419 420 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); 421 422 if (!uctx) 423 return NULL; 424 425 uctx->len = pfkey_sec_ctx_len(sec_ctx); 426 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 427 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 428 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 429 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 430 memcpy(uctx + 1, sec_ctx + 1, 431 uctx->ctx_len); 432 433 return uctx; 434 } 435 436 static int present_and_same_family(struct sadb_address *src, 437 struct sadb_address *dst) 438 { 439 struct sockaddr *s_addr, *d_addr; 440 441 if (!src || !dst) 442 return 0; 443 444 s_addr = (struct sockaddr *)(src + 1); 445 d_addr = (struct sockaddr *)(dst + 1); 446 if (s_addr->sa_family != d_addr->sa_family) 447 return 0; 448 if (s_addr->sa_family != AF_INET 449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 450 && s_addr->sa_family != AF_INET6 451 #endif 452 ) 453 return 0; 454 455 return 1; 456 } 457 458 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 459 { 460 char *p = (char *) hdr; 461 int len = skb->len; 462 463 len -= sizeof(*hdr); 464 p += sizeof(*hdr); 465 while (len > 0) { 466 struct sadb_ext *ehdr = (struct sadb_ext *) p; 467 uint16_t ext_type; 468 int ext_len; 469 470 ext_len = ehdr->sadb_ext_len; 471 ext_len *= sizeof(uint64_t); 472 ext_type = ehdr->sadb_ext_type; 473 if (ext_len < sizeof(uint64_t) || 474 ext_len > len || 475 ext_type == SADB_EXT_RESERVED) 476 return -EINVAL; 477 478 if (ext_type <= SADB_EXT_MAX) { 479 int min = (int) sadb_ext_min_len[ext_type]; 480 if (ext_len < min) 481 return -EINVAL; 482 if (ext_hdrs[ext_type-1] != NULL) 483 return -EINVAL; 484 if (ext_type == SADB_EXT_ADDRESS_SRC || 485 ext_type == SADB_EXT_ADDRESS_DST || 486 ext_type == SADB_EXT_ADDRESS_PROXY || 487 ext_type == SADB_X_EXT_NAT_T_OA) { 488 if (verify_address_len(p)) 489 return -EINVAL; 490 } 491 if (ext_type == SADB_X_EXT_SEC_CTX) { 492 if (verify_sec_ctx_len(p)) 493 return -EINVAL; 494 } 495 ext_hdrs[ext_type-1] = p; 496 } 497 p += ext_len; 498 len -= ext_len; 499 } 500 501 return 0; 502 } 503 504 static uint16_t 505 pfkey_satype2proto(uint8_t satype) 506 { 507 switch (satype) { 508 case SADB_SATYPE_UNSPEC: 509 return IPSEC_PROTO_ANY; 510 case SADB_SATYPE_AH: 511 return IPPROTO_AH; 512 case SADB_SATYPE_ESP: 513 return IPPROTO_ESP; 514 case SADB_X_SATYPE_IPCOMP: 515 return IPPROTO_COMP; 516 break; 517 default: 518 return 0; 519 } 520 /* NOTREACHED */ 521 } 522 523 static uint8_t 524 pfkey_proto2satype(uint16_t proto) 525 { 526 switch (proto) { 527 case IPPROTO_AH: 528 return SADB_SATYPE_AH; 529 case IPPROTO_ESP: 530 return SADB_SATYPE_ESP; 531 case IPPROTO_COMP: 532 return SADB_X_SATYPE_IPCOMP; 533 break; 534 default: 535 return 0; 536 } 537 /* NOTREACHED */ 538 } 539 540 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 541 * say specifically 'just raw sockets' as we encode them as 255. 542 */ 543 544 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 545 { 546 return (proto == IPSEC_PROTO_ANY ? 0 : proto); 547 } 548 549 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 550 { 551 return (proto ? proto : IPSEC_PROTO_ANY); 552 } 553 554 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, 555 xfrm_address_t *xaddr) 556 { 557 switch (((struct sockaddr*)(addr + 1))->sa_family) { 558 case AF_INET: 559 xaddr->a4 = 560 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; 561 return AF_INET; 562 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 563 case AF_INET6: 564 memcpy(xaddr->a6, 565 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, 566 sizeof(struct in6_addr)); 567 return AF_INET6; 568 #endif 569 default: 570 return 0; 571 } 572 /* NOTREACHED */ 573 } 574 575 static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) 576 { 577 struct sadb_sa *sa; 578 struct sadb_address *addr; 579 uint16_t proto; 580 unsigned short family; 581 xfrm_address_t *xaddr; 582 583 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 584 if (sa == NULL) 585 return NULL; 586 587 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 588 if (proto == 0) 589 return NULL; 590 591 /* sadb_address_len should be checked by caller */ 592 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 593 if (addr == NULL) 594 return NULL; 595 596 family = ((struct sockaddr *)(addr + 1))->sa_family; 597 switch (family) { 598 case AF_INET: 599 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; 600 break; 601 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 602 case AF_INET6: 603 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; 604 break; 605 #endif 606 default: 607 xaddr = NULL; 608 } 609 610 if (!xaddr) 611 return NULL; 612 613 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); 614 } 615 616 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 617 static int 618 pfkey_sockaddr_size(sa_family_t family) 619 { 620 switch (family) { 621 case AF_INET: 622 return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); 623 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 624 case AF_INET6: 625 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); 626 #endif 627 default: 628 return 0; 629 } 630 /* NOTREACHED */ 631 } 632 633 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) 634 { 635 struct sk_buff *skb; 636 struct sadb_msg *hdr; 637 struct sadb_sa *sa; 638 struct sadb_lifetime *lifetime; 639 struct sadb_address *addr; 640 struct sadb_key *key; 641 struct sadb_x_sa2 *sa2; 642 struct sockaddr_in *sin; 643 struct sadb_x_sec_ctx *sec_ctx; 644 struct xfrm_sec_ctx *xfrm_ctx; 645 int ctx_size = 0; 646 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 647 struct sockaddr_in6 *sin6; 648 #endif 649 int size; 650 int auth_key_size = 0; 651 int encrypt_key_size = 0; 652 int sockaddr_size; 653 struct xfrm_encap_tmpl *natt = NULL; 654 655 /* address family check */ 656 sockaddr_size = pfkey_sockaddr_size(x->props.family); 657 if (!sockaddr_size) 658 return ERR_PTR(-EINVAL); 659 660 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 661 key(AE), (identity(SD),) (sensitivity)> */ 662 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 663 sizeof(struct sadb_lifetime) + 664 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 665 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 666 sizeof(struct sadb_address)*2 + 667 sockaddr_size*2 + 668 sizeof(struct sadb_x_sa2); 669 670 if ((xfrm_ctx = x->security)) { 671 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 672 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 673 } 674 675 /* identity & sensitivity */ 676 677 if ((x->props.family == AF_INET && 678 x->sel.saddr.a4 != x->props.saddr.a4) 679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 680 || (x->props.family == AF_INET6 && 681 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) 682 #endif 683 ) 684 size += sizeof(struct sadb_address) + sockaddr_size; 685 686 if (add_keys) { 687 if (x->aalg && x->aalg->alg_key_len) { 688 auth_key_size = 689 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 690 size += sizeof(struct sadb_key) + auth_key_size; 691 } 692 if (x->ealg && x->ealg->alg_key_len) { 693 encrypt_key_size = 694 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 695 size += sizeof(struct sadb_key) + encrypt_key_size; 696 } 697 } 698 if (x->encap) 699 natt = x->encap; 700 701 if (natt && natt->encap_type) { 702 size += sizeof(struct sadb_x_nat_t_type); 703 size += sizeof(struct sadb_x_nat_t_port); 704 size += sizeof(struct sadb_x_nat_t_port); 705 } 706 707 skb = alloc_skb(size + 16, GFP_ATOMIC); 708 if (skb == NULL) 709 return ERR_PTR(-ENOBUFS); 710 711 /* call should fill header later */ 712 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 713 memset(hdr, 0, size); /* XXX do we need this ? */ 714 hdr->sadb_msg_len = size / sizeof(uint64_t); 715 716 /* sa */ 717 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 718 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 719 sa->sadb_sa_exttype = SADB_EXT_SA; 720 sa->sadb_sa_spi = x->id.spi; 721 sa->sadb_sa_replay = x->props.replay_window; 722 switch (x->km.state) { 723 case XFRM_STATE_VALID: 724 sa->sadb_sa_state = x->km.dying ? 725 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 726 break; 727 case XFRM_STATE_ACQ: 728 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 729 break; 730 default: 731 sa->sadb_sa_state = SADB_SASTATE_DEAD; 732 break; 733 } 734 sa->sadb_sa_auth = 0; 735 if (x->aalg) { 736 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 737 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; 738 } 739 sa->sadb_sa_encrypt = 0; 740 BUG_ON(x->ealg && x->calg); 741 if (x->ealg) { 742 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 743 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 744 } 745 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 746 if (x->calg) { 747 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 748 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 749 } 750 751 sa->sadb_sa_flags = 0; 752 if (x->props.flags & XFRM_STATE_NOECN) 753 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 754 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 755 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 756 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 757 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 758 759 /* hard time */ 760 if (hsc & 2) { 761 lifetime = (struct sadb_lifetime *) skb_put(skb, 762 sizeof(struct sadb_lifetime)); 763 lifetime->sadb_lifetime_len = 764 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 765 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 766 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 767 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 768 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 769 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 770 } 771 /* soft time */ 772 if (hsc & 1) { 773 lifetime = (struct sadb_lifetime *) skb_put(skb, 774 sizeof(struct sadb_lifetime)); 775 lifetime->sadb_lifetime_len = 776 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 777 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 778 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 779 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 780 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 781 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 782 } 783 /* current time */ 784 lifetime = (struct sadb_lifetime *) skb_put(skb, 785 sizeof(struct sadb_lifetime)); 786 lifetime->sadb_lifetime_len = 787 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 788 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 789 lifetime->sadb_lifetime_allocations = x->curlft.packets; 790 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 791 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 792 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 793 /* src address */ 794 addr = (struct sadb_address*) skb_put(skb, 795 sizeof(struct sadb_address)+sockaddr_size); 796 addr->sadb_address_len = 797 (sizeof(struct sadb_address)+sockaddr_size)/ 798 sizeof(uint64_t); 799 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 800 /* "if the ports are non-zero, then the sadb_address_proto field, 801 normally zero, MUST be filled in with the transport 802 protocol's number." - RFC2367 */ 803 addr->sadb_address_proto = 0; 804 addr->sadb_address_reserved = 0; 805 if (x->props.family == AF_INET) { 806 addr->sadb_address_prefixlen = 32; 807 808 sin = (struct sockaddr_in *) (addr + 1); 809 sin->sin_family = AF_INET; 810 sin->sin_addr.s_addr = x->props.saddr.a4; 811 sin->sin_port = 0; 812 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 813 } 814 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 815 else if (x->props.family == AF_INET6) { 816 addr->sadb_address_prefixlen = 128; 817 818 sin6 = (struct sockaddr_in6 *) (addr + 1); 819 sin6->sin6_family = AF_INET6; 820 sin6->sin6_port = 0; 821 sin6->sin6_flowinfo = 0; 822 memcpy(&sin6->sin6_addr, x->props.saddr.a6, 823 sizeof(struct in6_addr)); 824 sin6->sin6_scope_id = 0; 825 } 826 #endif 827 else 828 BUG(); 829 830 /* dst address */ 831 addr = (struct sadb_address*) skb_put(skb, 832 sizeof(struct sadb_address)+sockaddr_size); 833 addr->sadb_address_len = 834 (sizeof(struct sadb_address)+sockaddr_size)/ 835 sizeof(uint64_t); 836 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 837 addr->sadb_address_proto = 0; 838 addr->sadb_address_prefixlen = 32; /* XXX */ 839 addr->sadb_address_reserved = 0; 840 if (x->props.family == AF_INET) { 841 sin = (struct sockaddr_in *) (addr + 1); 842 sin->sin_family = AF_INET; 843 sin->sin_addr.s_addr = x->id.daddr.a4; 844 sin->sin_port = 0; 845 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 846 847 if (x->sel.saddr.a4 != x->props.saddr.a4) { 848 addr = (struct sadb_address*) skb_put(skb, 849 sizeof(struct sadb_address)+sockaddr_size); 850 addr->sadb_address_len = 851 (sizeof(struct sadb_address)+sockaddr_size)/ 852 sizeof(uint64_t); 853 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 854 addr->sadb_address_proto = 855 pfkey_proto_from_xfrm(x->sel.proto); 856 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 857 addr->sadb_address_reserved = 0; 858 859 sin = (struct sockaddr_in *) (addr + 1); 860 sin->sin_family = AF_INET; 861 sin->sin_addr.s_addr = x->sel.saddr.a4; 862 sin->sin_port = x->sel.sport; 863 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 864 } 865 } 866 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 867 else if (x->props.family == AF_INET6) { 868 addr->sadb_address_prefixlen = 128; 869 870 sin6 = (struct sockaddr_in6 *) (addr + 1); 871 sin6->sin6_family = AF_INET6; 872 sin6->sin6_port = 0; 873 sin6->sin6_flowinfo = 0; 874 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); 875 sin6->sin6_scope_id = 0; 876 877 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, 878 sizeof(struct in6_addr))) { 879 addr = (struct sadb_address *) skb_put(skb, 880 sizeof(struct sadb_address)+sockaddr_size); 881 addr->sadb_address_len = 882 (sizeof(struct sadb_address)+sockaddr_size)/ 883 sizeof(uint64_t); 884 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 885 addr->sadb_address_proto = 886 pfkey_proto_from_xfrm(x->sel.proto); 887 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 888 addr->sadb_address_reserved = 0; 889 890 sin6 = (struct sockaddr_in6 *) (addr + 1); 891 sin6->sin6_family = AF_INET6; 892 sin6->sin6_port = x->sel.sport; 893 sin6->sin6_flowinfo = 0; 894 memcpy(&sin6->sin6_addr, x->sel.saddr.a6, 895 sizeof(struct in6_addr)); 896 sin6->sin6_scope_id = 0; 897 } 898 } 899 #endif 900 else 901 BUG(); 902 903 /* auth key */ 904 if (add_keys && auth_key_size) { 905 key = (struct sadb_key *) skb_put(skb, 906 sizeof(struct sadb_key)+auth_key_size); 907 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 908 sizeof(uint64_t); 909 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 910 key->sadb_key_bits = x->aalg->alg_key_len; 911 key->sadb_key_reserved = 0; 912 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 913 } 914 /* encrypt key */ 915 if (add_keys && encrypt_key_size) { 916 key = (struct sadb_key *) skb_put(skb, 917 sizeof(struct sadb_key)+encrypt_key_size); 918 key->sadb_key_len = (sizeof(struct sadb_key) + 919 encrypt_key_size) / sizeof(uint64_t); 920 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 921 key->sadb_key_bits = x->ealg->alg_key_len; 922 key->sadb_key_reserved = 0; 923 memcpy(key + 1, x->ealg->alg_key, 924 (x->ealg->alg_key_len+7)/8); 925 } 926 927 /* sa */ 928 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 929 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 930 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 931 sa2->sadb_x_sa2_mode = x->props.mode + 1; 932 sa2->sadb_x_sa2_reserved1 = 0; 933 sa2->sadb_x_sa2_reserved2 = 0; 934 sa2->sadb_x_sa2_sequence = 0; 935 sa2->sadb_x_sa2_reqid = x->props.reqid; 936 937 if (natt && natt->encap_type) { 938 struct sadb_x_nat_t_type *n_type; 939 struct sadb_x_nat_t_port *n_port; 940 941 /* type */ 942 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 943 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 944 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 945 n_type->sadb_x_nat_t_type_type = natt->encap_type; 946 n_type->sadb_x_nat_t_type_reserved[0] = 0; 947 n_type->sadb_x_nat_t_type_reserved[1] = 0; 948 n_type->sadb_x_nat_t_type_reserved[2] = 0; 949 950 /* source port */ 951 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 952 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 953 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 954 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 955 n_port->sadb_x_nat_t_port_reserved = 0; 956 957 /* dest port */ 958 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 959 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 960 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 961 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 962 n_port->sadb_x_nat_t_port_reserved = 0; 963 } 964 965 /* security context */ 966 if (xfrm_ctx) { 967 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 968 sizeof(struct sadb_x_sec_ctx) + ctx_size); 969 sec_ctx->sadb_x_sec_len = 970 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 971 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 972 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 973 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 974 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 975 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 976 xfrm_ctx->ctx_len); 977 } 978 979 return skb; 980 } 981 982 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, 983 void **ext_hdrs) 984 { 985 struct xfrm_state *x; 986 struct sadb_lifetime *lifetime; 987 struct sadb_sa *sa; 988 struct sadb_key *key; 989 struct sadb_x_sec_ctx *sec_ctx; 990 uint16_t proto; 991 int err; 992 993 994 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 995 if (!sa || 996 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 997 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 998 return ERR_PTR(-EINVAL); 999 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1000 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1001 return ERR_PTR(-EINVAL); 1002 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1003 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1004 return ERR_PTR(-EINVAL); 1005 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1006 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1007 return ERR_PTR(-EINVAL); 1008 1009 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1010 if (proto == 0) 1011 return ERR_PTR(-EINVAL); 1012 1013 /* default error is no buffer space */ 1014 err = -ENOBUFS; 1015 1016 /* RFC2367: 1017 1018 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1019 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1020 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1021 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1022 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1023 not true. 1024 1025 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1026 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1027 */ 1028 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1029 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1030 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1031 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1032 return ERR_PTR(-EINVAL); 1033 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1034 if (key != NULL && 1035 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1036 ((key->sadb_key_bits+7) / 8 == 0 || 1037 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1038 return ERR_PTR(-EINVAL); 1039 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1040 if (key != NULL && 1041 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1042 ((key->sadb_key_bits+7) / 8 == 0 || 1043 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1044 return ERR_PTR(-EINVAL); 1045 1046 x = xfrm_state_alloc(); 1047 if (x == NULL) 1048 return ERR_PTR(-ENOBUFS); 1049 1050 x->id.proto = proto; 1051 x->id.spi = sa->sadb_sa_spi; 1052 x->props.replay_window = sa->sadb_sa_replay; 1053 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1054 x->props.flags |= XFRM_STATE_NOECN; 1055 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1056 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1057 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1058 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1059 1060 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; 1061 if (lifetime != NULL) { 1062 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1063 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1064 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1065 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1066 } 1067 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; 1068 if (lifetime != NULL) { 1069 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1070 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1071 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1072 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1073 } 1074 1075 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 1076 if (sec_ctx != NULL) { 1077 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1078 1079 if (!uctx) 1080 goto out; 1081 1082 err = security_xfrm_state_alloc(x, uctx); 1083 kfree(uctx); 1084 1085 if (err) 1086 goto out; 1087 } 1088 1089 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1090 if (sa->sadb_sa_auth) { 1091 int keysize = 0; 1092 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1093 if (!a) { 1094 err = -ENOSYS; 1095 goto out; 1096 } 1097 if (key) 1098 keysize = (key->sadb_key_bits + 7) / 8; 1099 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1100 if (!x->aalg) 1101 goto out; 1102 strcpy(x->aalg->alg_name, a->name); 1103 x->aalg->alg_key_len = 0; 1104 if (key) { 1105 x->aalg->alg_key_len = key->sadb_key_bits; 1106 memcpy(x->aalg->alg_key, key+1, keysize); 1107 } 1108 x->props.aalgo = sa->sadb_sa_auth; 1109 /* x->algo.flags = sa->sadb_sa_flags; */ 1110 } 1111 if (sa->sadb_sa_encrypt) { 1112 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1113 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1114 if (!a) { 1115 err = -ENOSYS; 1116 goto out; 1117 } 1118 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1119 if (!x->calg) 1120 goto out; 1121 strcpy(x->calg->alg_name, a->name); 1122 x->props.calgo = sa->sadb_sa_encrypt; 1123 } else { 1124 int keysize = 0; 1125 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1126 if (!a) { 1127 err = -ENOSYS; 1128 goto out; 1129 } 1130 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1131 if (key) 1132 keysize = (key->sadb_key_bits + 7) / 8; 1133 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1134 if (!x->ealg) 1135 goto out; 1136 strcpy(x->ealg->alg_name, a->name); 1137 x->ealg->alg_key_len = 0; 1138 if (key) { 1139 x->ealg->alg_key_len = key->sadb_key_bits; 1140 memcpy(x->ealg->alg_key, key+1, keysize); 1141 } 1142 x->props.ealgo = sa->sadb_sa_encrypt; 1143 } 1144 } 1145 /* x->algo.flags = sa->sadb_sa_flags; */ 1146 1147 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1148 &x->props.saddr); 1149 if (!x->props.family) { 1150 err = -EAFNOSUPPORT; 1151 goto out; 1152 } 1153 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1154 &x->id.daddr); 1155 1156 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1157 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1158 x->props.mode = sa2->sadb_x_sa2_mode; 1159 if (x->props.mode) 1160 x->props.mode--; 1161 x->props.reqid = sa2->sadb_x_sa2_reqid; 1162 } 1163 1164 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1165 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1166 1167 /* Nobody uses this, but we try. */ 1168 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1169 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1170 } 1171 1172 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1173 struct sadb_x_nat_t_type* n_type; 1174 struct xfrm_encap_tmpl *natt; 1175 1176 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1177 if (!x->encap) 1178 goto out; 1179 1180 natt = x->encap; 1181 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1182 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1183 1184 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1185 struct sadb_x_nat_t_port* n_port = 1186 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1187 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1188 } 1189 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1190 struct sadb_x_nat_t_port* n_port = 1191 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1192 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1193 } 1194 } 1195 1196 err = xfrm_init_state(x); 1197 if (err) 1198 goto out; 1199 1200 x->km.seq = hdr->sadb_msg_seq; 1201 return x; 1202 1203 out: 1204 x->km.state = XFRM_STATE_DEAD; 1205 xfrm_state_put(x); 1206 return ERR_PTR(err); 1207 } 1208 1209 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1210 { 1211 return -EOPNOTSUPP; 1212 } 1213 1214 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1215 { 1216 struct sk_buff *resp_skb; 1217 struct sadb_x_sa2 *sa2; 1218 struct sadb_address *saddr, *daddr; 1219 struct sadb_msg *out_hdr; 1220 struct xfrm_state *x = NULL; 1221 u8 mode; 1222 u32 reqid; 1223 u8 proto; 1224 unsigned short family; 1225 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1226 1227 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1228 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1229 return -EINVAL; 1230 1231 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1232 if (proto == 0) 1233 return -EINVAL; 1234 1235 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1236 mode = sa2->sadb_x_sa2_mode - 1; 1237 reqid = sa2->sadb_x_sa2_reqid; 1238 } else { 1239 mode = 0; 1240 reqid = 0; 1241 } 1242 1243 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1244 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1245 1246 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1247 switch (family) { 1248 case AF_INET: 1249 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1250 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1251 break; 1252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1253 case AF_INET6: 1254 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1255 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1256 break; 1257 #endif 1258 } 1259 1260 if (hdr->sadb_msg_seq) { 1261 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1262 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1263 xfrm_state_put(x); 1264 x = NULL; 1265 } 1266 } 1267 1268 if (!x) 1269 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); 1270 1271 if (x == NULL) 1272 return -ENOENT; 1273 1274 resp_skb = ERR_PTR(-ENOENT); 1275 1276 spin_lock_bh(&x->lock); 1277 if (x->km.state != XFRM_STATE_DEAD) { 1278 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1279 u32 min_spi, max_spi; 1280 1281 if (range != NULL) { 1282 min_spi = range->sadb_spirange_min; 1283 max_spi = range->sadb_spirange_max; 1284 } else { 1285 min_spi = 0x100; 1286 max_spi = 0x0fffffff; 1287 } 1288 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); 1289 if (x->id.spi) 1290 resp_skb = pfkey_xfrm_state2msg(x, 0, 3); 1291 } 1292 spin_unlock_bh(&x->lock); 1293 1294 if (IS_ERR(resp_skb)) { 1295 xfrm_state_put(x); 1296 return PTR_ERR(resp_skb); 1297 } 1298 1299 out_hdr = (struct sadb_msg *) resp_skb->data; 1300 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1301 out_hdr->sadb_msg_type = SADB_GETSPI; 1302 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1303 out_hdr->sadb_msg_errno = 0; 1304 out_hdr->sadb_msg_reserved = 0; 1305 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1306 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1307 1308 xfrm_state_put(x); 1309 1310 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); 1311 1312 return 0; 1313 } 1314 1315 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1316 { 1317 struct xfrm_state *x; 1318 1319 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1320 return -EOPNOTSUPP; 1321 1322 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1323 return 0; 1324 1325 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1326 if (x == NULL) 1327 return 0; 1328 1329 spin_lock_bh(&x->lock); 1330 if (x->km.state == XFRM_STATE_ACQ) { 1331 x->km.state = XFRM_STATE_ERROR; 1332 wake_up(&km_waitq); 1333 } 1334 spin_unlock_bh(&x->lock); 1335 xfrm_state_put(x); 1336 return 0; 1337 } 1338 1339 static inline int event2poltype(int event) 1340 { 1341 switch (event) { 1342 case XFRM_MSG_DELPOLICY: 1343 return SADB_X_SPDDELETE; 1344 case XFRM_MSG_NEWPOLICY: 1345 return SADB_X_SPDADD; 1346 case XFRM_MSG_UPDPOLICY: 1347 return SADB_X_SPDUPDATE; 1348 case XFRM_MSG_POLEXPIRE: 1349 // return SADB_X_SPDEXPIRE; 1350 default: 1351 printk("pfkey: Unknown policy event %d\n", event); 1352 break; 1353 } 1354 1355 return 0; 1356 } 1357 1358 static inline int event2keytype(int event) 1359 { 1360 switch (event) { 1361 case XFRM_MSG_DELSA: 1362 return SADB_DELETE; 1363 case XFRM_MSG_NEWSA: 1364 return SADB_ADD; 1365 case XFRM_MSG_UPDSA: 1366 return SADB_UPDATE; 1367 case XFRM_MSG_EXPIRE: 1368 return SADB_EXPIRE; 1369 default: 1370 printk("pfkey: Unknown SA event %d\n", event); 1371 break; 1372 } 1373 1374 return 0; 1375 } 1376 1377 /* ADD/UPD/DEL */ 1378 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1379 { 1380 struct sk_buff *skb; 1381 struct sadb_msg *hdr; 1382 int hsc = 3; 1383 1384 if (c->event == XFRM_MSG_DELSA) 1385 hsc = 0; 1386 1387 skb = pfkey_xfrm_state2msg(x, 0, hsc); 1388 1389 if (IS_ERR(skb)) 1390 return PTR_ERR(skb); 1391 1392 hdr = (struct sadb_msg *) skb->data; 1393 hdr->sadb_msg_version = PF_KEY_V2; 1394 hdr->sadb_msg_type = event2keytype(c->event); 1395 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1396 hdr->sadb_msg_errno = 0; 1397 hdr->sadb_msg_reserved = 0; 1398 hdr->sadb_msg_seq = c->seq; 1399 hdr->sadb_msg_pid = c->pid; 1400 1401 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1402 1403 return 0; 1404 } 1405 1406 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1407 { 1408 struct xfrm_state *x; 1409 int err; 1410 struct km_event c; 1411 1412 xfrm_probe_algs(); 1413 1414 x = pfkey_msg2xfrm_state(hdr, ext_hdrs); 1415 if (IS_ERR(x)) 1416 return PTR_ERR(x); 1417 1418 xfrm_state_hold(x); 1419 if (hdr->sadb_msg_type == SADB_ADD) 1420 err = xfrm_state_add(x); 1421 else 1422 err = xfrm_state_update(x); 1423 1424 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 1425 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x); 1426 1427 if (err < 0) { 1428 x->km.state = XFRM_STATE_DEAD; 1429 __xfrm_state_put(x); 1430 goto out; 1431 } 1432 1433 if (hdr->sadb_msg_type == SADB_ADD) 1434 c.event = XFRM_MSG_NEWSA; 1435 else 1436 c.event = XFRM_MSG_UPDSA; 1437 c.seq = hdr->sadb_msg_seq; 1438 c.pid = hdr->sadb_msg_pid; 1439 km_state_notify(x, &c); 1440 out: 1441 xfrm_state_put(x); 1442 return err; 1443 } 1444 1445 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1446 { 1447 struct xfrm_state *x; 1448 struct km_event c; 1449 int err; 1450 1451 if (!ext_hdrs[SADB_EXT_SA-1] || 1452 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1453 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1454 return -EINVAL; 1455 1456 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1457 if (x == NULL) 1458 return -ESRCH; 1459 1460 if ((err = security_xfrm_state_delete(x))) 1461 goto out; 1462 1463 if (xfrm_state_kern(x)) { 1464 err = -EPERM; 1465 goto out; 1466 } 1467 1468 err = xfrm_state_delete(x); 1469 1470 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 1471 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x); 1472 1473 if (err < 0) 1474 goto out; 1475 1476 c.seq = hdr->sadb_msg_seq; 1477 c.pid = hdr->sadb_msg_pid; 1478 c.event = XFRM_MSG_DELSA; 1479 km_state_notify(x, &c); 1480 out: 1481 xfrm_state_put(x); 1482 1483 return err; 1484 } 1485 1486 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1487 { 1488 __u8 proto; 1489 struct sk_buff *out_skb; 1490 struct sadb_msg *out_hdr; 1491 struct xfrm_state *x; 1492 1493 if (!ext_hdrs[SADB_EXT_SA-1] || 1494 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1495 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1496 return -EINVAL; 1497 1498 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1499 if (x == NULL) 1500 return -ESRCH; 1501 1502 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1503 proto = x->id.proto; 1504 xfrm_state_put(x); 1505 if (IS_ERR(out_skb)) 1506 return PTR_ERR(out_skb); 1507 1508 out_hdr = (struct sadb_msg *) out_skb->data; 1509 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1510 out_hdr->sadb_msg_type = SADB_DUMP; 1511 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1512 out_hdr->sadb_msg_errno = 0; 1513 out_hdr->sadb_msg_reserved = 0; 1514 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1515 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1516 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 1517 1518 return 0; 1519 } 1520 1521 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1522 gfp_t allocation) 1523 { 1524 struct sk_buff *skb; 1525 struct sadb_msg *hdr; 1526 int len, auth_len, enc_len, i; 1527 1528 auth_len = xfrm_count_auth_supported(); 1529 if (auth_len) { 1530 auth_len *= sizeof(struct sadb_alg); 1531 auth_len += sizeof(struct sadb_supported); 1532 } 1533 1534 enc_len = xfrm_count_enc_supported(); 1535 if (enc_len) { 1536 enc_len *= sizeof(struct sadb_alg); 1537 enc_len += sizeof(struct sadb_supported); 1538 } 1539 1540 len = enc_len + auth_len + sizeof(struct sadb_msg); 1541 1542 skb = alloc_skb(len + 16, allocation); 1543 if (!skb) 1544 goto out_put_algs; 1545 1546 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1547 pfkey_hdr_dup(hdr, orig); 1548 hdr->sadb_msg_errno = 0; 1549 hdr->sadb_msg_len = len / sizeof(uint64_t); 1550 1551 if (auth_len) { 1552 struct sadb_supported *sp; 1553 struct sadb_alg *ap; 1554 1555 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1556 ap = (struct sadb_alg *) (sp + 1); 1557 1558 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1559 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1560 1561 for (i = 0; ; i++) { 1562 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1563 if (!aalg) 1564 break; 1565 if (aalg->available) 1566 *ap++ = aalg->desc; 1567 } 1568 } 1569 1570 if (enc_len) { 1571 struct sadb_supported *sp; 1572 struct sadb_alg *ap; 1573 1574 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1575 ap = (struct sadb_alg *) (sp + 1); 1576 1577 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1578 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1579 1580 for (i = 0; ; i++) { 1581 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1582 if (!ealg) 1583 break; 1584 if (ealg->available) 1585 *ap++ = ealg->desc; 1586 } 1587 } 1588 1589 out_put_algs: 1590 return skb; 1591 } 1592 1593 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1594 { 1595 struct pfkey_sock *pfk = pfkey_sk(sk); 1596 struct sk_buff *supp_skb; 1597 1598 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1599 return -EINVAL; 1600 1601 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1602 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1603 return -EEXIST; 1604 pfk->registered |= (1<<hdr->sadb_msg_satype); 1605 } 1606 1607 xfrm_probe_algs(); 1608 1609 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1610 if (!supp_skb) { 1611 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1612 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1613 1614 return -ENOBUFS; 1615 } 1616 1617 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); 1618 1619 return 0; 1620 } 1621 1622 static int key_notify_sa_flush(struct km_event *c) 1623 { 1624 struct sk_buff *skb; 1625 struct sadb_msg *hdr; 1626 1627 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1628 if (!skb) 1629 return -ENOBUFS; 1630 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1631 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1632 hdr->sadb_msg_type = SADB_FLUSH; 1633 hdr->sadb_msg_seq = c->seq; 1634 hdr->sadb_msg_pid = c->pid; 1635 hdr->sadb_msg_version = PF_KEY_V2; 1636 hdr->sadb_msg_errno = (uint8_t) 0; 1637 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1638 1639 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1640 1641 return 0; 1642 } 1643 1644 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1645 { 1646 unsigned proto; 1647 struct km_event c; 1648 struct xfrm_audit audit_info; 1649 1650 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1651 if (proto == 0) 1652 return -EINVAL; 1653 1654 audit_info.loginuid = audit_get_loginuid(current->audit_context); 1655 audit_info.secid = 0; 1656 xfrm_state_flush(proto, &audit_info); 1657 c.data.proto = proto; 1658 c.seq = hdr->sadb_msg_seq; 1659 c.pid = hdr->sadb_msg_pid; 1660 c.event = XFRM_MSG_FLUSHSA; 1661 km_state_notify(NULL, &c); 1662 1663 return 0; 1664 } 1665 1666 struct pfkey_dump_data 1667 { 1668 struct sk_buff *skb; 1669 struct sadb_msg *hdr; 1670 struct sock *sk; 1671 }; 1672 1673 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1674 { 1675 struct pfkey_dump_data *data = ptr; 1676 struct sk_buff *out_skb; 1677 struct sadb_msg *out_hdr; 1678 1679 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1680 if (IS_ERR(out_skb)) 1681 return PTR_ERR(out_skb); 1682 1683 out_hdr = (struct sadb_msg *) out_skb->data; 1684 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 1685 out_hdr->sadb_msg_type = SADB_DUMP; 1686 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1687 out_hdr->sadb_msg_errno = 0; 1688 out_hdr->sadb_msg_reserved = 0; 1689 out_hdr->sadb_msg_seq = count; 1690 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 1691 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 1692 return 0; 1693 } 1694 1695 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1696 { 1697 u8 proto; 1698 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 1699 1700 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1701 if (proto == 0) 1702 return -EINVAL; 1703 1704 return xfrm_state_walk(proto, dump_sa, &data); 1705 } 1706 1707 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1708 { 1709 struct pfkey_sock *pfk = pfkey_sk(sk); 1710 int satype = hdr->sadb_msg_satype; 1711 1712 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1713 /* XXX we mangle packet... */ 1714 hdr->sadb_msg_errno = 0; 1715 if (satype != 0 && satype != 1) 1716 return -EINVAL; 1717 pfk->promisc = satype; 1718 } 1719 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); 1720 return 0; 1721 } 1722 1723 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1724 { 1725 int i; 1726 u32 reqid = *(u32*)ptr; 1727 1728 for (i=0; i<xp->xfrm_nr; i++) { 1729 if (xp->xfrm_vec[i].reqid == reqid) 1730 return -EEXIST; 1731 } 1732 return 0; 1733 } 1734 1735 static u32 gen_reqid(void) 1736 { 1737 u32 start; 1738 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1739 1740 start = reqid; 1741 do { 1742 ++reqid; 1743 if (reqid == 0) 1744 reqid = IPSEC_MANUAL_REQID_MAX+1; 1745 if (xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, check_reqid, 1746 (void*)&reqid) != -EEXIST) 1747 return reqid; 1748 } while (reqid != start); 1749 return 0; 1750 } 1751 1752 static int 1753 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1754 { 1755 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1756 struct sockaddr_in *sin; 1757 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1758 struct sockaddr_in6 *sin6; 1759 #endif 1760 1761 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1762 return -ELOOP; 1763 1764 if (rq->sadb_x_ipsecrequest_mode == 0) 1765 return -EINVAL; 1766 1767 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1768 t->mode = rq->sadb_x_ipsecrequest_mode-1; 1769 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1770 t->optional = 1; 1771 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1772 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1773 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1774 t->reqid = 0; 1775 if (!t->reqid && !(t->reqid = gen_reqid())) 1776 return -ENOBUFS; 1777 } 1778 1779 /* addresses present only in tunnel mode */ 1780 if (t->mode == XFRM_MODE_TUNNEL) { 1781 struct sockaddr *sa; 1782 sa = (struct sockaddr *)(rq+1); 1783 switch(sa->sa_family) { 1784 case AF_INET: 1785 sin = (struct sockaddr_in*)sa; 1786 t->saddr.a4 = sin->sin_addr.s_addr; 1787 sin++; 1788 if (sin->sin_family != AF_INET) 1789 return -EINVAL; 1790 t->id.daddr.a4 = sin->sin_addr.s_addr; 1791 break; 1792 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1793 case AF_INET6: 1794 sin6 = (struct sockaddr_in6*)sa; 1795 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1796 sin6++; 1797 if (sin6->sin6_family != AF_INET6) 1798 return -EINVAL; 1799 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1800 break; 1801 #endif 1802 default: 1803 return -EINVAL; 1804 } 1805 t->encap_family = sa->sa_family; 1806 } else 1807 t->encap_family = xp->family; 1808 1809 /* No way to set this via kame pfkey */ 1810 t->aalgos = t->ealgos = t->calgos = ~0; 1811 xp->xfrm_nr++; 1812 return 0; 1813 } 1814 1815 static int 1816 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1817 { 1818 int err; 1819 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1820 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1821 1822 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1823 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1824 return err; 1825 len -= rq->sadb_x_ipsecrequest_len; 1826 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1827 } 1828 return 0; 1829 } 1830 1831 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1832 { 1833 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1834 1835 if (xfrm_ctx) { 1836 int len = sizeof(struct sadb_x_sec_ctx); 1837 len += xfrm_ctx->ctx_len; 1838 return PFKEY_ALIGN8(len); 1839 } 1840 return 0; 1841 } 1842 1843 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1844 { 1845 struct xfrm_tmpl *t; 1846 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1847 int socklen = 0; 1848 int i; 1849 1850 for (i=0; i<xp->xfrm_nr; i++) { 1851 t = xp->xfrm_vec + i; 1852 socklen += (t->encap_family == AF_INET ? 1853 sizeof(struct sockaddr_in) : 1854 sizeof(struct sockaddr_in6)); 1855 } 1856 1857 return sizeof(struct sadb_msg) + 1858 (sizeof(struct sadb_lifetime) * 3) + 1859 (sizeof(struct sadb_address) * 2) + 1860 (sockaddr_size * 2) + 1861 sizeof(struct sadb_x_policy) + 1862 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1863 (socklen * 2) + 1864 pfkey_xfrm_policy2sec_ctx_size(xp); 1865 } 1866 1867 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1868 { 1869 struct sk_buff *skb; 1870 int size; 1871 1872 size = pfkey_xfrm_policy2msg_size(xp); 1873 1874 skb = alloc_skb(size + 16, GFP_ATOMIC); 1875 if (skb == NULL) 1876 return ERR_PTR(-ENOBUFS); 1877 1878 return skb; 1879 } 1880 1881 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1882 { 1883 struct sadb_msg *hdr; 1884 struct sadb_address *addr; 1885 struct sadb_lifetime *lifetime; 1886 struct sadb_x_policy *pol; 1887 struct sockaddr_in *sin; 1888 struct sadb_x_sec_ctx *sec_ctx; 1889 struct xfrm_sec_ctx *xfrm_ctx; 1890 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1891 struct sockaddr_in6 *sin6; 1892 #endif 1893 int i; 1894 int size; 1895 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1896 int socklen = (xp->family == AF_INET ? 1897 sizeof(struct sockaddr_in) : 1898 sizeof(struct sockaddr_in6)); 1899 1900 size = pfkey_xfrm_policy2msg_size(xp); 1901 1902 /* call should fill header later */ 1903 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1904 memset(hdr, 0, size); /* XXX do we need this ? */ 1905 1906 /* src address */ 1907 addr = (struct sadb_address*) skb_put(skb, 1908 sizeof(struct sadb_address)+sockaddr_size); 1909 addr->sadb_address_len = 1910 (sizeof(struct sadb_address)+sockaddr_size)/ 1911 sizeof(uint64_t); 1912 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 1913 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1914 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 1915 addr->sadb_address_reserved = 0; 1916 /* src address */ 1917 if (xp->family == AF_INET) { 1918 sin = (struct sockaddr_in *) (addr + 1); 1919 sin->sin_family = AF_INET; 1920 sin->sin_addr.s_addr = xp->selector.saddr.a4; 1921 sin->sin_port = xp->selector.sport; 1922 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1923 } 1924 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1925 else if (xp->family == AF_INET6) { 1926 sin6 = (struct sockaddr_in6 *) (addr + 1); 1927 sin6->sin6_family = AF_INET6; 1928 sin6->sin6_port = xp->selector.sport; 1929 sin6->sin6_flowinfo = 0; 1930 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, 1931 sizeof(struct in6_addr)); 1932 sin6->sin6_scope_id = 0; 1933 } 1934 #endif 1935 else 1936 BUG(); 1937 1938 /* dst address */ 1939 addr = (struct sadb_address*) skb_put(skb, 1940 sizeof(struct sadb_address)+sockaddr_size); 1941 addr->sadb_address_len = 1942 (sizeof(struct sadb_address)+sockaddr_size)/ 1943 sizeof(uint64_t); 1944 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 1945 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1946 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 1947 addr->sadb_address_reserved = 0; 1948 if (xp->family == AF_INET) { 1949 sin = (struct sockaddr_in *) (addr + 1); 1950 sin->sin_family = AF_INET; 1951 sin->sin_addr.s_addr = xp->selector.daddr.a4; 1952 sin->sin_port = xp->selector.dport; 1953 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1954 } 1955 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1956 else if (xp->family == AF_INET6) { 1957 sin6 = (struct sockaddr_in6 *) (addr + 1); 1958 sin6->sin6_family = AF_INET6; 1959 sin6->sin6_port = xp->selector.dport; 1960 sin6->sin6_flowinfo = 0; 1961 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, 1962 sizeof(struct in6_addr)); 1963 sin6->sin6_scope_id = 0; 1964 } 1965 #endif 1966 else 1967 BUG(); 1968 1969 /* hard time */ 1970 lifetime = (struct sadb_lifetime *) skb_put(skb, 1971 sizeof(struct sadb_lifetime)); 1972 lifetime->sadb_lifetime_len = 1973 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1974 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 1975 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 1976 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 1977 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 1978 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 1979 /* soft time */ 1980 lifetime = (struct sadb_lifetime *) skb_put(skb, 1981 sizeof(struct sadb_lifetime)); 1982 lifetime->sadb_lifetime_len = 1983 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1984 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 1985 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 1986 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 1987 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 1988 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 1989 /* current time */ 1990 lifetime = (struct sadb_lifetime *) skb_put(skb, 1991 sizeof(struct sadb_lifetime)); 1992 lifetime->sadb_lifetime_len = 1993 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1994 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 1995 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 1996 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 1997 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 1998 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 1999 2000 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2001 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2002 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2003 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2004 if (xp->action == XFRM_POLICY_ALLOW) { 2005 if (xp->xfrm_nr) 2006 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2007 else 2008 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2009 } 2010 pol->sadb_x_policy_dir = dir+1; 2011 pol->sadb_x_policy_id = xp->index; 2012 pol->sadb_x_policy_priority = xp->priority; 2013 2014 for (i=0; i<xp->xfrm_nr; i++) { 2015 struct sadb_x_ipsecrequest *rq; 2016 struct xfrm_tmpl *t = xp->xfrm_vec + i; 2017 int req_size; 2018 2019 req_size = sizeof(struct sadb_x_ipsecrequest); 2020 if (t->mode == XFRM_MODE_TUNNEL) 2021 req_size += ((t->encap_family == AF_INET ? 2022 sizeof(struct sockaddr_in) : 2023 sizeof(struct sockaddr_in6)) * 2); 2024 else 2025 size -= 2*socklen; 2026 rq = (void*)skb_put(skb, req_size); 2027 pol->sadb_x_policy_len += req_size/8; 2028 memset(rq, 0, sizeof(*rq)); 2029 rq->sadb_x_ipsecrequest_len = req_size; 2030 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2031 rq->sadb_x_ipsecrequest_mode = t->mode+1; 2032 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2033 if (t->reqid) 2034 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2035 if (t->optional) 2036 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2037 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2038 if (t->mode == XFRM_MODE_TUNNEL) { 2039 switch (t->encap_family) { 2040 case AF_INET: 2041 sin = (void*)(rq+1); 2042 sin->sin_family = AF_INET; 2043 sin->sin_addr.s_addr = t->saddr.a4; 2044 sin->sin_port = 0; 2045 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2046 sin++; 2047 sin->sin_family = AF_INET; 2048 sin->sin_addr.s_addr = t->id.daddr.a4; 2049 sin->sin_port = 0; 2050 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2051 break; 2052 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2053 case AF_INET6: 2054 sin6 = (void*)(rq+1); 2055 sin6->sin6_family = AF_INET6; 2056 sin6->sin6_port = 0; 2057 sin6->sin6_flowinfo = 0; 2058 memcpy(&sin6->sin6_addr, t->saddr.a6, 2059 sizeof(struct in6_addr)); 2060 sin6->sin6_scope_id = 0; 2061 2062 sin6++; 2063 sin6->sin6_family = AF_INET6; 2064 sin6->sin6_port = 0; 2065 sin6->sin6_flowinfo = 0; 2066 memcpy(&sin6->sin6_addr, t->id.daddr.a6, 2067 sizeof(struct in6_addr)); 2068 sin6->sin6_scope_id = 0; 2069 break; 2070 #endif 2071 default: 2072 break; 2073 } 2074 } 2075 } 2076 2077 /* security context */ 2078 if ((xfrm_ctx = xp->security)) { 2079 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2080 2081 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2082 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2083 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2084 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2085 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2086 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2087 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2088 xfrm_ctx->ctx_len); 2089 } 2090 2091 hdr->sadb_msg_len = size / sizeof(uint64_t); 2092 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2093 } 2094 2095 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2096 { 2097 struct sk_buff *out_skb; 2098 struct sadb_msg *out_hdr; 2099 int err; 2100 2101 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2102 if (IS_ERR(out_skb)) { 2103 err = PTR_ERR(out_skb); 2104 goto out; 2105 } 2106 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2107 2108 out_hdr = (struct sadb_msg *) out_skb->data; 2109 out_hdr->sadb_msg_version = PF_KEY_V2; 2110 2111 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2112 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2113 else 2114 out_hdr->sadb_msg_type = event2poltype(c->event); 2115 out_hdr->sadb_msg_errno = 0; 2116 out_hdr->sadb_msg_seq = c->seq; 2117 out_hdr->sadb_msg_pid = c->pid; 2118 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 2119 out: 2120 return 0; 2121 2122 } 2123 2124 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2125 { 2126 int err = 0; 2127 struct sadb_lifetime *lifetime; 2128 struct sadb_address *sa; 2129 struct sadb_x_policy *pol; 2130 struct xfrm_policy *xp; 2131 struct km_event c; 2132 struct sadb_x_sec_ctx *sec_ctx; 2133 2134 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2135 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2136 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2137 return -EINVAL; 2138 2139 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2140 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2141 return -EINVAL; 2142 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2143 return -EINVAL; 2144 2145 xp = xfrm_policy_alloc(GFP_KERNEL); 2146 if (xp == NULL) 2147 return -ENOBUFS; 2148 2149 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2150 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2151 xp->priority = pol->sadb_x_policy_priority; 2152 2153 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2154 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2155 if (!xp->family) { 2156 err = -EINVAL; 2157 goto out; 2158 } 2159 xp->selector.family = xp->family; 2160 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2161 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2162 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2163 if (xp->selector.sport) 2164 xp->selector.sport_mask = htons(0xffff); 2165 2166 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2167 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2168 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2169 2170 /* Amusing, we set this twice. KAME apps appear to set same value 2171 * in both addresses. 2172 */ 2173 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2174 2175 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2176 if (xp->selector.dport) 2177 xp->selector.dport_mask = htons(0xffff); 2178 2179 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2180 if (sec_ctx != NULL) { 2181 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2182 2183 if (!uctx) { 2184 err = -ENOBUFS; 2185 goto out; 2186 } 2187 2188 err = security_xfrm_policy_alloc(xp, uctx); 2189 kfree(uctx); 2190 2191 if (err) 2192 goto out; 2193 } 2194 2195 xp->lft.soft_byte_limit = XFRM_INF; 2196 xp->lft.hard_byte_limit = XFRM_INF; 2197 xp->lft.soft_packet_limit = XFRM_INF; 2198 xp->lft.hard_packet_limit = XFRM_INF; 2199 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2200 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2201 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2202 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2203 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2204 } 2205 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2206 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2207 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2208 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2209 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2210 } 2211 xp->xfrm_nr = 0; 2212 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2213 (err = parse_ipsecrequests(xp, pol)) < 0) 2214 goto out; 2215 2216 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2217 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2218 2219 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 2220 AUDIT_MAC_IPSEC_ADDSPD, err ? 0 : 1, xp, NULL); 2221 2222 if (err) 2223 goto out; 2224 2225 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2226 c.event = XFRM_MSG_UPDPOLICY; 2227 else 2228 c.event = XFRM_MSG_NEWPOLICY; 2229 2230 c.seq = hdr->sadb_msg_seq; 2231 c.pid = hdr->sadb_msg_pid; 2232 2233 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2234 xfrm_pol_put(xp); 2235 return 0; 2236 2237 out: 2238 security_xfrm_policy_free(xp); 2239 kfree(xp); 2240 return err; 2241 } 2242 2243 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2244 { 2245 int err; 2246 struct sadb_address *sa; 2247 struct sadb_x_policy *pol; 2248 struct xfrm_policy *xp, tmp; 2249 struct xfrm_selector sel; 2250 struct km_event c; 2251 struct sadb_x_sec_ctx *sec_ctx; 2252 2253 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2254 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2255 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2256 return -EINVAL; 2257 2258 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2259 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2260 return -EINVAL; 2261 2262 memset(&sel, 0, sizeof(sel)); 2263 2264 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2265 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2266 sel.prefixlen_s = sa->sadb_address_prefixlen; 2267 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2268 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2269 if (sel.sport) 2270 sel.sport_mask = htons(0xffff); 2271 2272 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2273 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2274 sel.prefixlen_d = sa->sadb_address_prefixlen; 2275 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2276 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2277 if (sel.dport) 2278 sel.dport_mask = htons(0xffff); 2279 2280 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2281 memset(&tmp, 0, sizeof(struct xfrm_policy)); 2282 2283 if (sec_ctx != NULL) { 2284 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2285 2286 if (!uctx) 2287 return -ENOMEM; 2288 2289 err = security_xfrm_policy_alloc(&tmp, uctx); 2290 kfree(uctx); 2291 2292 if (err) 2293 return err; 2294 } 2295 2296 xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN, pol->sadb_x_policy_dir-1, 2297 &sel, tmp.security, 1); 2298 security_xfrm_policy_free(&tmp); 2299 2300 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 2301 AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL); 2302 2303 if (xp == NULL) 2304 return -ENOENT; 2305 2306 err = 0; 2307 2308 if ((err = security_xfrm_policy_delete(xp))) 2309 goto out; 2310 c.seq = hdr->sadb_msg_seq; 2311 c.pid = hdr->sadb_msg_pid; 2312 c.event = XFRM_MSG_DELPOLICY; 2313 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2314 2315 out: 2316 xfrm_pol_put(xp); 2317 return err; 2318 } 2319 2320 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2321 { 2322 int err; 2323 struct sk_buff *out_skb; 2324 struct sadb_msg *out_hdr; 2325 err = 0; 2326 2327 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2328 if (IS_ERR(out_skb)) { 2329 err = PTR_ERR(out_skb); 2330 goto out; 2331 } 2332 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2333 2334 out_hdr = (struct sadb_msg *) out_skb->data; 2335 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2336 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2337 out_hdr->sadb_msg_satype = 0; 2338 out_hdr->sadb_msg_errno = 0; 2339 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2340 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2341 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 2342 err = 0; 2343 2344 out: 2345 return err; 2346 } 2347 2348 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2349 { 2350 unsigned int dir; 2351 int err; 2352 struct sadb_x_policy *pol; 2353 struct xfrm_policy *xp; 2354 struct km_event c; 2355 2356 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2357 return -EINVAL; 2358 2359 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2360 if (dir >= XFRM_POLICY_MAX) 2361 return -EINVAL; 2362 2363 xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id, 2364 hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2365 if (xp == NULL) 2366 return -ENOENT; 2367 2368 err = 0; 2369 2370 c.seq = hdr->sadb_msg_seq; 2371 c.pid = hdr->sadb_msg_pid; 2372 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) { 2373 c.data.byid = 1; 2374 c.event = XFRM_MSG_DELPOLICY; 2375 km_policy_notify(xp, dir, &c); 2376 } else { 2377 err = key_pol_get_resp(sk, xp, hdr, dir); 2378 } 2379 2380 xfrm_pol_put(xp); 2381 return err; 2382 } 2383 2384 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2385 { 2386 struct pfkey_dump_data *data = ptr; 2387 struct sk_buff *out_skb; 2388 struct sadb_msg *out_hdr; 2389 2390 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2391 if (IS_ERR(out_skb)) 2392 return PTR_ERR(out_skb); 2393 2394 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2395 2396 out_hdr = (struct sadb_msg *) out_skb->data; 2397 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 2398 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2399 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2400 out_hdr->sadb_msg_errno = 0; 2401 out_hdr->sadb_msg_seq = count; 2402 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 2403 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 2404 return 0; 2405 } 2406 2407 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2408 { 2409 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 2410 2411 return xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_sp, &data); 2412 } 2413 2414 static int key_notify_policy_flush(struct km_event *c) 2415 { 2416 struct sk_buff *skb_out; 2417 struct sadb_msg *hdr; 2418 2419 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2420 if (!skb_out) 2421 return -ENOBUFS; 2422 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2423 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2424 hdr->sadb_msg_seq = c->seq; 2425 hdr->sadb_msg_pid = c->pid; 2426 hdr->sadb_msg_version = PF_KEY_V2; 2427 hdr->sadb_msg_errno = (uint8_t) 0; 2428 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2429 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL); 2430 return 0; 2431 2432 } 2433 2434 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2435 { 2436 struct km_event c; 2437 struct xfrm_audit audit_info; 2438 2439 audit_info.loginuid = audit_get_loginuid(current->audit_context); 2440 audit_info.secid = 0; 2441 xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info); 2442 c.data.type = XFRM_POLICY_TYPE_MAIN; 2443 c.event = XFRM_MSG_FLUSHPOLICY; 2444 c.pid = hdr->sadb_msg_pid; 2445 c.seq = hdr->sadb_msg_seq; 2446 km_policy_notify(NULL, 0, &c); 2447 2448 return 0; 2449 } 2450 2451 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2452 struct sadb_msg *hdr, void **ext_hdrs); 2453 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2454 [SADB_RESERVED] = pfkey_reserved, 2455 [SADB_GETSPI] = pfkey_getspi, 2456 [SADB_UPDATE] = pfkey_add, 2457 [SADB_ADD] = pfkey_add, 2458 [SADB_DELETE] = pfkey_delete, 2459 [SADB_GET] = pfkey_get, 2460 [SADB_ACQUIRE] = pfkey_acquire, 2461 [SADB_REGISTER] = pfkey_register, 2462 [SADB_EXPIRE] = NULL, 2463 [SADB_FLUSH] = pfkey_flush, 2464 [SADB_DUMP] = pfkey_dump, 2465 [SADB_X_PROMISC] = pfkey_promisc, 2466 [SADB_X_PCHANGE] = NULL, 2467 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2468 [SADB_X_SPDADD] = pfkey_spdadd, 2469 [SADB_X_SPDDELETE] = pfkey_spddelete, 2470 [SADB_X_SPDGET] = pfkey_spdget, 2471 [SADB_X_SPDACQUIRE] = NULL, 2472 [SADB_X_SPDDUMP] = pfkey_spddump, 2473 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2474 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2475 [SADB_X_SPDDELETE2] = pfkey_spdget, 2476 }; 2477 2478 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2479 { 2480 void *ext_hdrs[SADB_EXT_MAX]; 2481 int err; 2482 2483 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2484 BROADCAST_PROMISC_ONLY, NULL); 2485 2486 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2487 err = parse_exthdrs(skb, hdr, ext_hdrs); 2488 if (!err) { 2489 err = -EOPNOTSUPP; 2490 if (pfkey_funcs[hdr->sadb_msg_type]) 2491 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2492 } 2493 return err; 2494 } 2495 2496 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2497 { 2498 struct sadb_msg *hdr = NULL; 2499 2500 if (skb->len < sizeof(*hdr)) { 2501 *errp = -EMSGSIZE; 2502 } else { 2503 hdr = (struct sadb_msg *) skb->data; 2504 if (hdr->sadb_msg_version != PF_KEY_V2 || 2505 hdr->sadb_msg_reserved != 0 || 2506 (hdr->sadb_msg_type <= SADB_RESERVED || 2507 hdr->sadb_msg_type > SADB_MAX)) { 2508 hdr = NULL; 2509 *errp = -EINVAL; 2510 } else if (hdr->sadb_msg_len != (skb->len / 2511 sizeof(uint64_t)) || 2512 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2513 sizeof(uint64_t))) { 2514 hdr = NULL; 2515 *errp = -EMSGSIZE; 2516 } else { 2517 *errp = 0; 2518 } 2519 } 2520 return hdr; 2521 } 2522 2523 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2524 { 2525 return t->aalgos & (1 << d->desc.sadb_alg_id); 2526 } 2527 2528 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2529 { 2530 return t->ealgos & (1 << d->desc.sadb_alg_id); 2531 } 2532 2533 static int count_ah_combs(struct xfrm_tmpl *t) 2534 { 2535 int i, sz = 0; 2536 2537 for (i = 0; ; i++) { 2538 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2539 if (!aalg) 2540 break; 2541 if (aalg_tmpl_set(t, aalg) && aalg->available) 2542 sz += sizeof(struct sadb_comb); 2543 } 2544 return sz + sizeof(struct sadb_prop); 2545 } 2546 2547 static int count_esp_combs(struct xfrm_tmpl *t) 2548 { 2549 int i, k, sz = 0; 2550 2551 for (i = 0; ; i++) { 2552 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2553 if (!ealg) 2554 break; 2555 2556 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2557 continue; 2558 2559 for (k = 1; ; k++) { 2560 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2561 if (!aalg) 2562 break; 2563 2564 if (aalg_tmpl_set(t, aalg) && aalg->available) 2565 sz += sizeof(struct sadb_comb); 2566 } 2567 } 2568 return sz + sizeof(struct sadb_prop); 2569 } 2570 2571 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2572 { 2573 struct sadb_prop *p; 2574 int i; 2575 2576 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2577 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2578 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2579 p->sadb_prop_replay = 32; 2580 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2581 2582 for (i = 0; ; i++) { 2583 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2584 if (!aalg) 2585 break; 2586 2587 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2588 struct sadb_comb *c; 2589 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2590 memset(c, 0, sizeof(*c)); 2591 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2592 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2593 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2594 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2595 c->sadb_comb_hard_addtime = 24*60*60; 2596 c->sadb_comb_soft_addtime = 20*60*60; 2597 c->sadb_comb_hard_usetime = 8*60*60; 2598 c->sadb_comb_soft_usetime = 7*60*60; 2599 } 2600 } 2601 } 2602 2603 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2604 { 2605 struct sadb_prop *p; 2606 int i, k; 2607 2608 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2609 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2610 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2611 p->sadb_prop_replay = 32; 2612 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2613 2614 for (i=0; ; i++) { 2615 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2616 if (!ealg) 2617 break; 2618 2619 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2620 continue; 2621 2622 for (k = 1; ; k++) { 2623 struct sadb_comb *c; 2624 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2625 if (!aalg) 2626 break; 2627 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2628 continue; 2629 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2630 memset(c, 0, sizeof(*c)); 2631 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2632 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2633 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2634 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2635 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2636 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2637 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2638 c->sadb_comb_hard_addtime = 24*60*60; 2639 c->sadb_comb_soft_addtime = 20*60*60; 2640 c->sadb_comb_hard_usetime = 8*60*60; 2641 c->sadb_comb_soft_usetime = 7*60*60; 2642 } 2643 } 2644 } 2645 2646 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2647 { 2648 return 0; 2649 } 2650 2651 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2652 { 2653 struct sk_buff *out_skb; 2654 struct sadb_msg *out_hdr; 2655 int hard; 2656 int hsc; 2657 2658 hard = c->data.hard; 2659 if (hard) 2660 hsc = 2; 2661 else 2662 hsc = 1; 2663 2664 out_skb = pfkey_xfrm_state2msg(x, 0, hsc); 2665 if (IS_ERR(out_skb)) 2666 return PTR_ERR(out_skb); 2667 2668 out_hdr = (struct sadb_msg *) out_skb->data; 2669 out_hdr->sadb_msg_version = PF_KEY_V2; 2670 out_hdr->sadb_msg_type = SADB_EXPIRE; 2671 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2672 out_hdr->sadb_msg_errno = 0; 2673 out_hdr->sadb_msg_reserved = 0; 2674 out_hdr->sadb_msg_seq = 0; 2675 out_hdr->sadb_msg_pid = 0; 2676 2677 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2678 return 0; 2679 } 2680 2681 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2682 { 2683 switch (c->event) { 2684 case XFRM_MSG_EXPIRE: 2685 return key_notify_sa_expire(x, c); 2686 case XFRM_MSG_DELSA: 2687 case XFRM_MSG_NEWSA: 2688 case XFRM_MSG_UPDSA: 2689 return key_notify_sa(x, c); 2690 case XFRM_MSG_FLUSHSA: 2691 return key_notify_sa_flush(c); 2692 case XFRM_MSG_NEWAE: /* not yet supported */ 2693 break; 2694 default: 2695 printk("pfkey: Unknown SA event %d\n", c->event); 2696 break; 2697 } 2698 2699 return 0; 2700 } 2701 2702 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2703 { 2704 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 2705 return 0; 2706 2707 switch (c->event) { 2708 case XFRM_MSG_POLEXPIRE: 2709 return key_notify_policy_expire(xp, c); 2710 case XFRM_MSG_DELPOLICY: 2711 case XFRM_MSG_NEWPOLICY: 2712 case XFRM_MSG_UPDPOLICY: 2713 return key_notify_policy(xp, dir, c); 2714 case XFRM_MSG_FLUSHPOLICY: 2715 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 2716 break; 2717 return key_notify_policy_flush(c); 2718 default: 2719 printk("pfkey: Unknown policy event %d\n", c->event); 2720 break; 2721 } 2722 2723 return 0; 2724 } 2725 2726 static u32 get_acqseq(void) 2727 { 2728 u32 res; 2729 static u32 acqseq; 2730 static DEFINE_SPINLOCK(acqseq_lock); 2731 2732 spin_lock_bh(&acqseq_lock); 2733 res = (++acqseq ? : ++acqseq); 2734 spin_unlock_bh(&acqseq_lock); 2735 return res; 2736 } 2737 2738 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 2739 { 2740 struct sk_buff *skb; 2741 struct sadb_msg *hdr; 2742 struct sadb_address *addr; 2743 struct sadb_x_policy *pol; 2744 struct sockaddr_in *sin; 2745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2746 struct sockaddr_in6 *sin6; 2747 #endif 2748 int sockaddr_size; 2749 int size; 2750 struct sadb_x_sec_ctx *sec_ctx; 2751 struct xfrm_sec_ctx *xfrm_ctx; 2752 int ctx_size = 0; 2753 2754 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2755 if (!sockaddr_size) 2756 return -EINVAL; 2757 2758 size = sizeof(struct sadb_msg) + 2759 (sizeof(struct sadb_address) * 2) + 2760 (sockaddr_size * 2) + 2761 sizeof(struct sadb_x_policy); 2762 2763 if (x->id.proto == IPPROTO_AH) 2764 size += count_ah_combs(t); 2765 else if (x->id.proto == IPPROTO_ESP) 2766 size += count_esp_combs(t); 2767 2768 if ((xfrm_ctx = x->security)) { 2769 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 2770 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 2771 } 2772 2773 skb = alloc_skb(size + 16, GFP_ATOMIC); 2774 if (skb == NULL) 2775 return -ENOMEM; 2776 2777 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2778 hdr->sadb_msg_version = PF_KEY_V2; 2779 hdr->sadb_msg_type = SADB_ACQUIRE; 2780 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2781 hdr->sadb_msg_len = size / sizeof(uint64_t); 2782 hdr->sadb_msg_errno = 0; 2783 hdr->sadb_msg_reserved = 0; 2784 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2785 hdr->sadb_msg_pid = 0; 2786 2787 /* src address */ 2788 addr = (struct sadb_address*) skb_put(skb, 2789 sizeof(struct sadb_address)+sockaddr_size); 2790 addr->sadb_address_len = 2791 (sizeof(struct sadb_address)+sockaddr_size)/ 2792 sizeof(uint64_t); 2793 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2794 addr->sadb_address_proto = 0; 2795 addr->sadb_address_reserved = 0; 2796 if (x->props.family == AF_INET) { 2797 addr->sadb_address_prefixlen = 32; 2798 2799 sin = (struct sockaddr_in *) (addr + 1); 2800 sin->sin_family = AF_INET; 2801 sin->sin_addr.s_addr = x->props.saddr.a4; 2802 sin->sin_port = 0; 2803 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2804 } 2805 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2806 else if (x->props.family == AF_INET6) { 2807 addr->sadb_address_prefixlen = 128; 2808 2809 sin6 = (struct sockaddr_in6 *) (addr + 1); 2810 sin6->sin6_family = AF_INET6; 2811 sin6->sin6_port = 0; 2812 sin6->sin6_flowinfo = 0; 2813 memcpy(&sin6->sin6_addr, 2814 x->props.saddr.a6, sizeof(struct in6_addr)); 2815 sin6->sin6_scope_id = 0; 2816 } 2817 #endif 2818 else 2819 BUG(); 2820 2821 /* dst address */ 2822 addr = (struct sadb_address*) skb_put(skb, 2823 sizeof(struct sadb_address)+sockaddr_size); 2824 addr->sadb_address_len = 2825 (sizeof(struct sadb_address)+sockaddr_size)/ 2826 sizeof(uint64_t); 2827 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2828 addr->sadb_address_proto = 0; 2829 addr->sadb_address_reserved = 0; 2830 if (x->props.family == AF_INET) { 2831 addr->sadb_address_prefixlen = 32; 2832 2833 sin = (struct sockaddr_in *) (addr + 1); 2834 sin->sin_family = AF_INET; 2835 sin->sin_addr.s_addr = x->id.daddr.a4; 2836 sin->sin_port = 0; 2837 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2838 } 2839 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2840 else if (x->props.family == AF_INET6) { 2841 addr->sadb_address_prefixlen = 128; 2842 2843 sin6 = (struct sockaddr_in6 *) (addr + 1); 2844 sin6->sin6_family = AF_INET6; 2845 sin6->sin6_port = 0; 2846 sin6->sin6_flowinfo = 0; 2847 memcpy(&sin6->sin6_addr, 2848 x->id.daddr.a6, sizeof(struct in6_addr)); 2849 sin6->sin6_scope_id = 0; 2850 } 2851 #endif 2852 else 2853 BUG(); 2854 2855 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2856 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2857 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2858 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2859 pol->sadb_x_policy_dir = dir+1; 2860 pol->sadb_x_policy_id = xp->index; 2861 2862 /* Set sadb_comb's. */ 2863 if (x->id.proto == IPPROTO_AH) 2864 dump_ah_combs(skb, t); 2865 else if (x->id.proto == IPPROTO_ESP) 2866 dump_esp_combs(skb, t); 2867 2868 /* security context */ 2869 if (xfrm_ctx) { 2870 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 2871 sizeof(struct sadb_x_sec_ctx) + ctx_size); 2872 sec_ctx->sadb_x_sec_len = 2873 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 2874 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2875 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2876 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2877 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2878 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2879 xfrm_ctx->ctx_len); 2880 } 2881 2882 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2883 } 2884 2885 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 2886 u8 *data, int len, int *dir) 2887 { 2888 struct xfrm_policy *xp; 2889 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 2890 struct sadb_x_sec_ctx *sec_ctx; 2891 2892 switch (sk->sk_family) { 2893 case AF_INET: 2894 if (opt != IP_IPSEC_POLICY) { 2895 *dir = -EOPNOTSUPP; 2896 return NULL; 2897 } 2898 break; 2899 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2900 case AF_INET6: 2901 if (opt != IPV6_IPSEC_POLICY) { 2902 *dir = -EOPNOTSUPP; 2903 return NULL; 2904 } 2905 break; 2906 #endif 2907 default: 2908 *dir = -EINVAL; 2909 return NULL; 2910 } 2911 2912 *dir = -EINVAL; 2913 2914 if (len < sizeof(struct sadb_x_policy) || 2915 pol->sadb_x_policy_len*8 > len || 2916 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 2917 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 2918 return NULL; 2919 2920 xp = xfrm_policy_alloc(GFP_ATOMIC); 2921 if (xp == NULL) { 2922 *dir = -ENOBUFS; 2923 return NULL; 2924 } 2925 2926 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2927 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2928 2929 xp->lft.soft_byte_limit = XFRM_INF; 2930 xp->lft.hard_byte_limit = XFRM_INF; 2931 xp->lft.soft_packet_limit = XFRM_INF; 2932 xp->lft.hard_packet_limit = XFRM_INF; 2933 xp->family = sk->sk_family; 2934 2935 xp->xfrm_nr = 0; 2936 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2937 (*dir = parse_ipsecrequests(xp, pol)) < 0) 2938 goto out; 2939 2940 /* security context too */ 2941 if (len >= (pol->sadb_x_policy_len*8 + 2942 sizeof(struct sadb_x_sec_ctx))) { 2943 char *p = (char *)pol; 2944 struct xfrm_user_sec_ctx *uctx; 2945 2946 p += pol->sadb_x_policy_len*8; 2947 sec_ctx = (struct sadb_x_sec_ctx *)p; 2948 if (len < pol->sadb_x_policy_len*8 + 2949 sec_ctx->sadb_x_sec_len) { 2950 *dir = -EINVAL; 2951 goto out; 2952 } 2953 if ((*dir = verify_sec_ctx_len(p))) 2954 goto out; 2955 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2956 *dir = security_xfrm_policy_alloc(xp, uctx); 2957 kfree(uctx); 2958 2959 if (*dir) 2960 goto out; 2961 } 2962 2963 *dir = pol->sadb_x_policy_dir-1; 2964 return xp; 2965 2966 out: 2967 security_xfrm_policy_free(xp); 2968 kfree(xp); 2969 return NULL; 2970 } 2971 2972 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 2973 { 2974 struct sk_buff *skb; 2975 struct sadb_msg *hdr; 2976 struct sadb_sa *sa; 2977 struct sadb_address *addr; 2978 struct sadb_x_nat_t_port *n_port; 2979 struct sockaddr_in *sin; 2980 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2981 struct sockaddr_in6 *sin6; 2982 #endif 2983 int sockaddr_size; 2984 int size; 2985 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 2986 struct xfrm_encap_tmpl *natt = NULL; 2987 2988 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2989 if (!sockaddr_size) 2990 return -EINVAL; 2991 2992 if (!satype) 2993 return -EINVAL; 2994 2995 if (!x->encap) 2996 return -EINVAL; 2997 2998 natt = x->encap; 2999 3000 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3001 * 3002 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3003 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3004 */ 3005 3006 size = sizeof(struct sadb_msg) + 3007 sizeof(struct sadb_sa) + 3008 (sizeof(struct sadb_address) * 2) + 3009 (sockaddr_size * 2) + 3010 (sizeof(struct sadb_x_nat_t_port) * 2); 3011 3012 skb = alloc_skb(size + 16, GFP_ATOMIC); 3013 if (skb == NULL) 3014 return -ENOMEM; 3015 3016 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3017 hdr->sadb_msg_version = PF_KEY_V2; 3018 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3019 hdr->sadb_msg_satype = satype; 3020 hdr->sadb_msg_len = size / sizeof(uint64_t); 3021 hdr->sadb_msg_errno = 0; 3022 hdr->sadb_msg_reserved = 0; 3023 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3024 hdr->sadb_msg_pid = 0; 3025 3026 /* SA */ 3027 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3028 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3029 sa->sadb_sa_exttype = SADB_EXT_SA; 3030 sa->sadb_sa_spi = x->id.spi; 3031 sa->sadb_sa_replay = 0; 3032 sa->sadb_sa_state = 0; 3033 sa->sadb_sa_auth = 0; 3034 sa->sadb_sa_encrypt = 0; 3035 sa->sadb_sa_flags = 0; 3036 3037 /* ADDRESS_SRC (old addr) */ 3038 addr = (struct sadb_address*) 3039 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3040 addr->sadb_address_len = 3041 (sizeof(struct sadb_address)+sockaddr_size)/ 3042 sizeof(uint64_t); 3043 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3044 addr->sadb_address_proto = 0; 3045 addr->sadb_address_reserved = 0; 3046 if (x->props.family == AF_INET) { 3047 addr->sadb_address_prefixlen = 32; 3048 3049 sin = (struct sockaddr_in *) (addr + 1); 3050 sin->sin_family = AF_INET; 3051 sin->sin_addr.s_addr = x->props.saddr.a4; 3052 sin->sin_port = 0; 3053 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3054 } 3055 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3056 else if (x->props.family == AF_INET6) { 3057 addr->sadb_address_prefixlen = 128; 3058 3059 sin6 = (struct sockaddr_in6 *) (addr + 1); 3060 sin6->sin6_family = AF_INET6; 3061 sin6->sin6_port = 0; 3062 sin6->sin6_flowinfo = 0; 3063 memcpy(&sin6->sin6_addr, 3064 x->props.saddr.a6, sizeof(struct in6_addr)); 3065 sin6->sin6_scope_id = 0; 3066 } 3067 #endif 3068 else 3069 BUG(); 3070 3071 /* NAT_T_SPORT (old port) */ 3072 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3073 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3074 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3075 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3076 n_port->sadb_x_nat_t_port_reserved = 0; 3077 3078 /* ADDRESS_DST (new addr) */ 3079 addr = (struct sadb_address*) 3080 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3081 addr->sadb_address_len = 3082 (sizeof(struct sadb_address)+sockaddr_size)/ 3083 sizeof(uint64_t); 3084 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3085 addr->sadb_address_proto = 0; 3086 addr->sadb_address_reserved = 0; 3087 if (x->props.family == AF_INET) { 3088 addr->sadb_address_prefixlen = 32; 3089 3090 sin = (struct sockaddr_in *) (addr + 1); 3091 sin->sin_family = AF_INET; 3092 sin->sin_addr.s_addr = ipaddr->a4; 3093 sin->sin_port = 0; 3094 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3095 } 3096 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3097 else if (x->props.family == AF_INET6) { 3098 addr->sadb_address_prefixlen = 128; 3099 3100 sin6 = (struct sockaddr_in6 *) (addr + 1); 3101 sin6->sin6_family = AF_INET6; 3102 sin6->sin6_port = 0; 3103 sin6->sin6_flowinfo = 0; 3104 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); 3105 sin6->sin6_scope_id = 0; 3106 } 3107 #endif 3108 else 3109 BUG(); 3110 3111 /* NAT_T_DPORT (new port) */ 3112 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3113 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3114 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3115 n_port->sadb_x_nat_t_port_port = sport; 3116 n_port->sadb_x_nat_t_port_reserved = 0; 3117 3118 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 3119 } 3120 3121 static int pfkey_sendmsg(struct kiocb *kiocb, 3122 struct socket *sock, struct msghdr *msg, size_t len) 3123 { 3124 struct sock *sk = sock->sk; 3125 struct sk_buff *skb = NULL; 3126 struct sadb_msg *hdr = NULL; 3127 int err; 3128 3129 err = -EOPNOTSUPP; 3130 if (msg->msg_flags & MSG_OOB) 3131 goto out; 3132 3133 err = -EMSGSIZE; 3134 if ((unsigned)len > sk->sk_sndbuf - 32) 3135 goto out; 3136 3137 err = -ENOBUFS; 3138 skb = alloc_skb(len, GFP_KERNEL); 3139 if (skb == NULL) 3140 goto out; 3141 3142 err = -EFAULT; 3143 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3144 goto out; 3145 3146 hdr = pfkey_get_base_msg(skb, &err); 3147 if (!hdr) 3148 goto out; 3149 3150 mutex_lock(&xfrm_cfg_mutex); 3151 err = pfkey_process(sk, skb, hdr); 3152 mutex_unlock(&xfrm_cfg_mutex); 3153 3154 out: 3155 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3156 err = 0; 3157 if (skb) 3158 kfree_skb(skb); 3159 3160 return err ? : len; 3161 } 3162 3163 static int pfkey_recvmsg(struct kiocb *kiocb, 3164 struct socket *sock, struct msghdr *msg, size_t len, 3165 int flags) 3166 { 3167 struct sock *sk = sock->sk; 3168 struct sk_buff *skb; 3169 int copied, err; 3170 3171 err = -EINVAL; 3172 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3173 goto out; 3174 3175 msg->msg_namelen = 0; 3176 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3177 if (skb == NULL) 3178 goto out; 3179 3180 copied = skb->len; 3181 if (copied > len) { 3182 msg->msg_flags |= MSG_TRUNC; 3183 copied = len; 3184 } 3185 3186 skb->h.raw = skb->data; 3187 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3188 if (err) 3189 goto out_free; 3190 3191 sock_recv_timestamp(msg, sk, skb); 3192 3193 err = (flags & MSG_TRUNC) ? skb->len : copied; 3194 3195 out_free: 3196 skb_free_datagram(sk, skb); 3197 out: 3198 return err; 3199 } 3200 3201 static const struct proto_ops pfkey_ops = { 3202 .family = PF_KEY, 3203 .owner = THIS_MODULE, 3204 /* Operations that make no sense on pfkey sockets. */ 3205 .bind = sock_no_bind, 3206 .connect = sock_no_connect, 3207 .socketpair = sock_no_socketpair, 3208 .accept = sock_no_accept, 3209 .getname = sock_no_getname, 3210 .ioctl = sock_no_ioctl, 3211 .listen = sock_no_listen, 3212 .shutdown = sock_no_shutdown, 3213 .setsockopt = sock_no_setsockopt, 3214 .getsockopt = sock_no_getsockopt, 3215 .mmap = sock_no_mmap, 3216 .sendpage = sock_no_sendpage, 3217 3218 /* Now the operations that really occur. */ 3219 .release = pfkey_release, 3220 .poll = datagram_poll, 3221 .sendmsg = pfkey_sendmsg, 3222 .recvmsg = pfkey_recvmsg, 3223 }; 3224 3225 static struct net_proto_family pfkey_family_ops = { 3226 .family = PF_KEY, 3227 .create = pfkey_create, 3228 .owner = THIS_MODULE, 3229 }; 3230 3231 #ifdef CONFIG_PROC_FS 3232 static int pfkey_read_proc(char *buffer, char **start, off_t offset, 3233 int length, int *eof, void *data) 3234 { 3235 off_t pos = 0; 3236 off_t begin = 0; 3237 int len = 0; 3238 struct sock *s; 3239 struct hlist_node *node; 3240 3241 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); 3242 3243 read_lock(&pfkey_table_lock); 3244 3245 sk_for_each(s, node, &pfkey_table) { 3246 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", 3247 s, 3248 atomic_read(&s->sk_refcnt), 3249 atomic_read(&s->sk_rmem_alloc), 3250 atomic_read(&s->sk_wmem_alloc), 3251 sock_i_uid(s), 3252 sock_i_ino(s) 3253 ); 3254 3255 buffer[len++] = '\n'; 3256 3257 pos = begin + len; 3258 if (pos < offset) { 3259 len = 0; 3260 begin = pos; 3261 } 3262 if(pos > offset + length) 3263 goto done; 3264 } 3265 *eof = 1; 3266 3267 done: 3268 read_unlock(&pfkey_table_lock); 3269 3270 *start = buffer + (offset - begin); 3271 len -= (offset - begin); 3272 3273 if (len > length) 3274 len = length; 3275 if (len < 0) 3276 len = 0; 3277 3278 return len; 3279 } 3280 #endif 3281 3282 static struct xfrm_mgr pfkeyv2_mgr = 3283 { 3284 .id = "pfkeyv2", 3285 .notify = pfkey_send_notify, 3286 .acquire = pfkey_send_acquire, 3287 .compile_policy = pfkey_compile_policy, 3288 .new_mapping = pfkey_send_new_mapping, 3289 .notify_policy = pfkey_send_policy_notify, 3290 }; 3291 3292 static void __exit ipsec_pfkey_exit(void) 3293 { 3294 xfrm_unregister_km(&pfkeyv2_mgr); 3295 remove_proc_entry("net/pfkey", NULL); 3296 sock_unregister(PF_KEY); 3297 proto_unregister(&key_proto); 3298 } 3299 3300 static int __init ipsec_pfkey_init(void) 3301 { 3302 int err = proto_register(&key_proto, 0); 3303 3304 if (err != 0) 3305 goto out; 3306 3307 err = sock_register(&pfkey_family_ops); 3308 if (err != 0) 3309 goto out_unregister_key_proto; 3310 #ifdef CONFIG_PROC_FS 3311 err = -ENOMEM; 3312 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) 3313 goto out_sock_unregister; 3314 #endif 3315 err = xfrm_register_km(&pfkeyv2_mgr); 3316 if (err != 0) 3317 goto out_remove_proc_entry; 3318 out: 3319 return err; 3320 out_remove_proc_entry: 3321 #ifdef CONFIG_PROC_FS 3322 remove_proc_entry("net/pfkey", NULL); 3323 out_sock_unregister: 3324 #endif 3325 sock_unregister(PF_KEY); 3326 out_unregister_key_proto: 3327 proto_unregister(&key_proto); 3328 goto out; 3329 } 3330 3331 module_init(ipsec_pfkey_init); 3332 module_exit(ipsec_pfkey_exit); 3333 MODULE_LICENSE("GPL"); 3334 MODULE_ALIAS_NETPROTO(PF_KEY); 3335