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 31 #include <net/sock.h> 32 33 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 34 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 35 36 37 /* List of all pfkey sockets. */ 38 static HLIST_HEAD(pfkey_table); 39 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); 40 static DEFINE_RWLOCK(pfkey_table_lock); 41 static atomic_t pfkey_table_users = ATOMIC_INIT(0); 42 43 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); 44 45 struct pfkey_sock { 46 /* struct sock must be the first member of struct pfkey_sock */ 47 struct sock sk; 48 int registered; 49 int promisc; 50 }; 51 52 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 53 { 54 return (struct pfkey_sock *)sk; 55 } 56 57 static void pfkey_sock_destruct(struct sock *sk) 58 { 59 skb_queue_purge(&sk->sk_receive_queue); 60 61 if (!sock_flag(sk, SOCK_DEAD)) { 62 printk("Attempt to release alive pfkey socket: %p\n", sk); 63 return; 64 } 65 66 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 67 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 68 69 atomic_dec(&pfkey_socks_nr); 70 } 71 72 static void pfkey_table_grab(void) 73 { 74 write_lock_bh(&pfkey_table_lock); 75 76 if (atomic_read(&pfkey_table_users)) { 77 DECLARE_WAITQUEUE(wait, current); 78 79 add_wait_queue_exclusive(&pfkey_table_wait, &wait); 80 for(;;) { 81 set_current_state(TASK_UNINTERRUPTIBLE); 82 if (atomic_read(&pfkey_table_users) == 0) 83 break; 84 write_unlock_bh(&pfkey_table_lock); 85 schedule(); 86 write_lock_bh(&pfkey_table_lock); 87 } 88 89 __set_current_state(TASK_RUNNING); 90 remove_wait_queue(&pfkey_table_wait, &wait); 91 } 92 } 93 94 static __inline__ void pfkey_table_ungrab(void) 95 { 96 write_unlock_bh(&pfkey_table_lock); 97 wake_up(&pfkey_table_wait); 98 } 99 100 static __inline__ void pfkey_lock_table(void) 101 { 102 /* read_lock() synchronizes us to pfkey_table_grab */ 103 104 read_lock(&pfkey_table_lock); 105 atomic_inc(&pfkey_table_users); 106 read_unlock(&pfkey_table_lock); 107 } 108 109 static __inline__ void pfkey_unlock_table(void) 110 { 111 if (atomic_dec_and_test(&pfkey_table_users)) 112 wake_up(&pfkey_table_wait); 113 } 114 115 116 static const struct proto_ops pfkey_ops; 117 118 static void pfkey_insert(struct sock *sk) 119 { 120 pfkey_table_grab(); 121 sk_add_node(sk, &pfkey_table); 122 pfkey_table_ungrab(); 123 } 124 125 static void pfkey_remove(struct sock *sk) 126 { 127 pfkey_table_grab(); 128 sk_del_node_init(sk); 129 pfkey_table_ungrab(); 130 } 131 132 static struct proto key_proto = { 133 .name = "KEY", 134 .owner = THIS_MODULE, 135 .obj_size = sizeof(struct pfkey_sock), 136 }; 137 138 static int pfkey_create(struct socket *sock, int protocol) 139 { 140 struct sock *sk; 141 int err; 142 143 if (!capable(CAP_NET_ADMIN)) 144 return -EPERM; 145 if (sock->type != SOCK_RAW) 146 return -ESOCKTNOSUPPORT; 147 if (protocol != PF_KEY_V2) 148 return -EPROTONOSUPPORT; 149 150 err = -ENOMEM; 151 sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1); 152 if (sk == NULL) 153 goto out; 154 155 sock->ops = &pfkey_ops; 156 sock_init_data(sock, sk); 157 158 sk->sk_family = PF_KEY; 159 sk->sk_destruct = pfkey_sock_destruct; 160 161 atomic_inc(&pfkey_socks_nr); 162 163 pfkey_insert(sk); 164 165 return 0; 166 out: 167 return err; 168 } 169 170 static int pfkey_release(struct socket *sock) 171 { 172 struct sock *sk = sock->sk; 173 174 if (!sk) 175 return 0; 176 177 pfkey_remove(sk); 178 179 sock_orphan(sk); 180 sock->sk = NULL; 181 skb_queue_purge(&sk->sk_write_queue); 182 sock_put(sk); 183 184 return 0; 185 } 186 187 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 188 gfp_t allocation, struct sock *sk) 189 { 190 int err = -ENOBUFS; 191 192 sock_hold(sk); 193 if (*skb2 == NULL) { 194 if (atomic_read(&skb->users) != 1) { 195 *skb2 = skb_clone(skb, allocation); 196 } else { 197 *skb2 = skb; 198 atomic_inc(&skb->users); 199 } 200 } 201 if (*skb2 != NULL) { 202 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 203 skb_orphan(*skb2); 204 skb_set_owner_r(*skb2, sk); 205 skb_queue_tail(&sk->sk_receive_queue, *skb2); 206 sk->sk_data_ready(sk, (*skb2)->len); 207 *skb2 = NULL; 208 err = 0; 209 } 210 } 211 sock_put(sk); 212 return err; 213 } 214 215 /* Send SKB to all pfkey sockets matching selected criteria. */ 216 #define BROADCAST_ALL 0 217 #define BROADCAST_ONE 1 218 #define BROADCAST_REGISTERED 2 219 #define BROADCAST_PROMISC_ONLY 4 220 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 221 int broadcast_flags, struct sock *one_sk) 222 { 223 struct sock *sk; 224 struct hlist_node *node; 225 struct sk_buff *skb2 = NULL; 226 int err = -ESRCH; 227 228 /* XXX Do we need something like netlink_overrun? I think 229 * XXX PF_KEY socket apps will not mind current behavior. 230 */ 231 if (!skb) 232 return -ENOMEM; 233 234 pfkey_lock_table(); 235 sk_for_each(sk, node, &pfkey_table) { 236 struct pfkey_sock *pfk = pfkey_sk(sk); 237 int err2; 238 239 /* Yes, it means that if you are meant to receive this 240 * pfkey message you receive it twice as promiscuous 241 * socket. 242 */ 243 if (pfk->promisc) 244 pfkey_broadcast_one(skb, &skb2, allocation, sk); 245 246 /* the exact target will be processed later */ 247 if (sk == one_sk) 248 continue; 249 if (broadcast_flags != BROADCAST_ALL) { 250 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 251 continue; 252 if ((broadcast_flags & BROADCAST_REGISTERED) && 253 !pfk->registered) 254 continue; 255 if (broadcast_flags & BROADCAST_ONE) 256 continue; 257 } 258 259 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 260 261 /* Error is cleare after succecful sending to at least one 262 * registered KM */ 263 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 264 err = err2; 265 } 266 pfkey_unlock_table(); 267 268 if (one_sk != NULL) 269 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 270 271 if (skb2) 272 kfree_skb(skb2); 273 kfree_skb(skb); 274 return err; 275 } 276 277 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) 278 { 279 *new = *orig; 280 } 281 282 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) 283 { 284 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 285 struct sadb_msg *hdr; 286 287 if (!skb) 288 return -ENOBUFS; 289 290 /* Woe be to the platform trying to support PFKEY yet 291 * having normal errnos outside the 1-255 range, inclusive. 292 */ 293 err = -err; 294 if (err == ERESTARTSYS || 295 err == ERESTARTNOHAND || 296 err == ERESTARTNOINTR) 297 err = EINTR; 298 if (err >= 512) 299 err = EINVAL; 300 BUG_ON(err <= 0 || err >= 256); 301 302 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 303 pfkey_hdr_dup(hdr, orig); 304 hdr->sadb_msg_errno = (uint8_t) err; 305 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 306 sizeof(uint64_t)); 307 308 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); 309 310 return 0; 311 } 312 313 static u8 sadb_ext_min_len[] = { 314 [SADB_EXT_RESERVED] = (u8) 0, 315 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 316 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 317 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 318 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 319 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 320 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 321 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 322 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 323 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 324 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 325 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 326 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 327 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 328 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 329 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 330 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 331 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 332 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 333 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 334 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 335 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 336 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 337 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 338 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 339 }; 340 341 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 342 static int verify_address_len(void *p) 343 { 344 struct sadb_address *sp = p; 345 struct sockaddr *addr = (struct sockaddr *)(sp + 1); 346 struct sockaddr_in *sin; 347 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 348 struct sockaddr_in6 *sin6; 349 #endif 350 int len; 351 352 switch (addr->sa_family) { 353 case AF_INET: 354 len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); 355 len /= sizeof(uint64_t); 356 if (sp->sadb_address_len != len || 357 sp->sadb_address_prefixlen > 32) 358 return -EINVAL; 359 break; 360 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 361 case AF_INET6: 362 len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); 363 len /= sizeof(uint64_t); 364 if (sp->sadb_address_len != len || 365 sp->sadb_address_prefixlen > 128) 366 return -EINVAL; 367 break; 368 #endif 369 default: 370 /* It is user using kernel to keep track of security 371 * associations for another protocol, such as 372 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 373 * lengths. 374 * 375 * XXX Actually, association/policy database is not yet 376 * XXX able to cope with arbitrary sockaddr families. 377 * XXX When it can, remove this -EINVAL. -DaveM 378 */ 379 return -EINVAL; 380 break; 381 }; 382 383 return 0; 384 } 385 386 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) 387 { 388 int len = 0; 389 390 len += sizeof(struct sadb_x_sec_ctx); 391 len += sec_ctx->sadb_x_ctx_len; 392 len += sizeof(uint64_t) - 1; 393 len /= sizeof(uint64_t); 394 395 return len; 396 } 397 398 static inline int verify_sec_ctx_len(void *p) 399 { 400 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; 401 int len; 402 403 if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE) 404 return -EINVAL; 405 406 len = pfkey_sec_ctx_len(sec_ctx); 407 408 if (sec_ctx->sadb_x_sec_len != len) 409 return -EINVAL; 410 411 return 0; 412 } 413 414 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) 415 { 416 struct xfrm_user_sec_ctx *uctx = NULL; 417 int ctx_size = sec_ctx->sadb_x_ctx_len; 418 419 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); 420 421 if (!uctx) 422 return NULL; 423 424 uctx->len = pfkey_sec_ctx_len(sec_ctx); 425 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 426 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 427 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 428 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 429 memcpy(uctx + 1, sec_ctx + 1, 430 uctx->ctx_len); 431 432 return uctx; 433 } 434 435 static int present_and_same_family(struct sadb_address *src, 436 struct sadb_address *dst) 437 { 438 struct sockaddr *s_addr, *d_addr; 439 440 if (!src || !dst) 441 return 0; 442 443 s_addr = (struct sockaddr *)(src + 1); 444 d_addr = (struct sockaddr *)(dst + 1); 445 if (s_addr->sa_family != d_addr->sa_family) 446 return 0; 447 if (s_addr->sa_family != AF_INET 448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 449 && s_addr->sa_family != AF_INET6 450 #endif 451 ) 452 return 0; 453 454 return 1; 455 } 456 457 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 458 { 459 char *p = (char *) hdr; 460 int len = skb->len; 461 462 len -= sizeof(*hdr); 463 p += sizeof(*hdr); 464 while (len > 0) { 465 struct sadb_ext *ehdr = (struct sadb_ext *) p; 466 uint16_t ext_type; 467 int ext_len; 468 469 ext_len = ehdr->sadb_ext_len; 470 ext_len *= sizeof(uint64_t); 471 ext_type = ehdr->sadb_ext_type; 472 if (ext_len < sizeof(uint64_t) || 473 ext_len > len || 474 ext_type == SADB_EXT_RESERVED) 475 return -EINVAL; 476 477 if (ext_type <= SADB_EXT_MAX) { 478 int min = (int) sadb_ext_min_len[ext_type]; 479 if (ext_len < min) 480 return -EINVAL; 481 if (ext_hdrs[ext_type-1] != NULL) 482 return -EINVAL; 483 if (ext_type == SADB_EXT_ADDRESS_SRC || 484 ext_type == SADB_EXT_ADDRESS_DST || 485 ext_type == SADB_EXT_ADDRESS_PROXY || 486 ext_type == SADB_X_EXT_NAT_T_OA) { 487 if (verify_address_len(p)) 488 return -EINVAL; 489 } 490 if (ext_type == SADB_X_EXT_SEC_CTX) { 491 if (verify_sec_ctx_len(p)) 492 return -EINVAL; 493 } 494 ext_hdrs[ext_type-1] = p; 495 } 496 p += ext_len; 497 len -= ext_len; 498 } 499 500 return 0; 501 } 502 503 static uint16_t 504 pfkey_satype2proto(uint8_t satype) 505 { 506 switch (satype) { 507 case SADB_SATYPE_UNSPEC: 508 return IPSEC_PROTO_ANY; 509 case SADB_SATYPE_AH: 510 return IPPROTO_AH; 511 case SADB_SATYPE_ESP: 512 return IPPROTO_ESP; 513 case SADB_X_SATYPE_IPCOMP: 514 return IPPROTO_COMP; 515 break; 516 default: 517 return 0; 518 } 519 /* NOTREACHED */ 520 } 521 522 static uint8_t 523 pfkey_proto2satype(uint16_t proto) 524 { 525 switch (proto) { 526 case IPPROTO_AH: 527 return SADB_SATYPE_AH; 528 case IPPROTO_ESP: 529 return SADB_SATYPE_ESP; 530 case IPPROTO_COMP: 531 return SADB_X_SATYPE_IPCOMP; 532 break; 533 default: 534 return 0; 535 } 536 /* NOTREACHED */ 537 } 538 539 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 540 * say specifically 'just raw sockets' as we encode them as 255. 541 */ 542 543 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 544 { 545 return (proto == IPSEC_PROTO_ANY ? 0 : proto); 546 } 547 548 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 549 { 550 return (proto ? proto : IPSEC_PROTO_ANY); 551 } 552 553 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, 554 xfrm_address_t *xaddr) 555 { 556 switch (((struct sockaddr*)(addr + 1))->sa_family) { 557 case AF_INET: 558 xaddr->a4 = 559 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; 560 return AF_INET; 561 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 562 case AF_INET6: 563 memcpy(xaddr->a6, 564 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, 565 sizeof(struct in6_addr)); 566 return AF_INET6; 567 #endif 568 default: 569 return 0; 570 } 571 /* NOTREACHED */ 572 } 573 574 static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) 575 { 576 struct sadb_sa *sa; 577 struct sadb_address *addr; 578 uint16_t proto; 579 unsigned short family; 580 xfrm_address_t *xaddr; 581 582 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 583 if (sa == NULL) 584 return NULL; 585 586 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 587 if (proto == 0) 588 return NULL; 589 590 /* sadb_address_len should be checked by caller */ 591 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 592 if (addr == NULL) 593 return NULL; 594 595 family = ((struct sockaddr *)(addr + 1))->sa_family; 596 switch (family) { 597 case AF_INET: 598 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; 599 break; 600 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 601 case AF_INET6: 602 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; 603 break; 604 #endif 605 default: 606 xaddr = NULL; 607 } 608 609 if (!xaddr) 610 return NULL; 611 612 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); 613 } 614 615 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 616 static int 617 pfkey_sockaddr_size(sa_family_t family) 618 { 619 switch (family) { 620 case AF_INET: 621 return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); 622 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 623 case AF_INET6: 624 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); 625 #endif 626 default: 627 return 0; 628 } 629 /* NOTREACHED */ 630 } 631 632 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) 633 { 634 struct sk_buff *skb; 635 struct sadb_msg *hdr; 636 struct sadb_sa *sa; 637 struct sadb_lifetime *lifetime; 638 struct sadb_address *addr; 639 struct sadb_key *key; 640 struct sadb_x_sa2 *sa2; 641 struct sockaddr_in *sin; 642 struct sadb_x_sec_ctx *sec_ctx; 643 struct xfrm_sec_ctx *xfrm_ctx; 644 int ctx_size = 0; 645 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 646 struct sockaddr_in6 *sin6; 647 #endif 648 int size; 649 int auth_key_size = 0; 650 int encrypt_key_size = 0; 651 int sockaddr_size; 652 struct xfrm_encap_tmpl *natt = NULL; 653 654 /* address family check */ 655 sockaddr_size = pfkey_sockaddr_size(x->props.family); 656 if (!sockaddr_size) 657 return ERR_PTR(-EINVAL); 658 659 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 660 key(AE), (identity(SD),) (sensitivity)> */ 661 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 662 sizeof(struct sadb_lifetime) + 663 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 664 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 665 sizeof(struct sadb_address)*2 + 666 sockaddr_size*2 + 667 sizeof(struct sadb_x_sa2); 668 669 if ((xfrm_ctx = x->security)) { 670 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 671 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 672 } 673 674 /* identity & sensitivity */ 675 676 if ((x->props.family == AF_INET && 677 x->sel.saddr.a4 != x->props.saddr.a4) 678 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 679 || (x->props.family == AF_INET6 && 680 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) 681 #endif 682 ) 683 size += sizeof(struct sadb_address) + sockaddr_size; 684 685 if (add_keys) { 686 if (x->aalg && x->aalg->alg_key_len) { 687 auth_key_size = 688 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 689 size += sizeof(struct sadb_key) + auth_key_size; 690 } 691 if (x->ealg && x->ealg->alg_key_len) { 692 encrypt_key_size = 693 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 694 size += sizeof(struct sadb_key) + encrypt_key_size; 695 } 696 } 697 if (x->encap) 698 natt = x->encap; 699 700 if (natt && natt->encap_type) { 701 size += sizeof(struct sadb_x_nat_t_type); 702 size += sizeof(struct sadb_x_nat_t_port); 703 size += sizeof(struct sadb_x_nat_t_port); 704 } 705 706 skb = alloc_skb(size + 16, GFP_ATOMIC); 707 if (skb == NULL) 708 return ERR_PTR(-ENOBUFS); 709 710 /* call should fill header later */ 711 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 712 memset(hdr, 0, size); /* XXX do we need this ? */ 713 hdr->sadb_msg_len = size / sizeof(uint64_t); 714 715 /* sa */ 716 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 717 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 718 sa->sadb_sa_exttype = SADB_EXT_SA; 719 sa->sadb_sa_spi = x->id.spi; 720 sa->sadb_sa_replay = x->props.replay_window; 721 switch (x->km.state) { 722 case XFRM_STATE_VALID: 723 sa->sadb_sa_state = x->km.dying ? 724 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 725 break; 726 case XFRM_STATE_ACQ: 727 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 728 break; 729 default: 730 sa->sadb_sa_state = SADB_SASTATE_DEAD; 731 break; 732 } 733 sa->sadb_sa_auth = 0; 734 if (x->aalg) { 735 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 736 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; 737 } 738 sa->sadb_sa_encrypt = 0; 739 BUG_ON(x->ealg && x->calg); 740 if (x->ealg) { 741 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 742 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 743 } 744 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 745 if (x->calg) { 746 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 747 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 748 } 749 750 sa->sadb_sa_flags = 0; 751 if (x->props.flags & XFRM_STATE_NOECN) 752 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 753 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 754 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 755 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 756 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 757 758 /* hard time */ 759 if (hsc & 2) { 760 lifetime = (struct sadb_lifetime *) skb_put(skb, 761 sizeof(struct sadb_lifetime)); 762 lifetime->sadb_lifetime_len = 763 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 764 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 765 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 766 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 767 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 768 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 769 } 770 /* soft time */ 771 if (hsc & 1) { 772 lifetime = (struct sadb_lifetime *) skb_put(skb, 773 sizeof(struct sadb_lifetime)); 774 lifetime->sadb_lifetime_len = 775 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 776 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 777 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 778 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 779 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 780 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 781 } 782 /* current time */ 783 lifetime = (struct sadb_lifetime *) skb_put(skb, 784 sizeof(struct sadb_lifetime)); 785 lifetime->sadb_lifetime_len = 786 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 787 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 788 lifetime->sadb_lifetime_allocations = x->curlft.packets; 789 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 790 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 791 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 792 /* src address */ 793 addr = (struct sadb_address*) skb_put(skb, 794 sizeof(struct sadb_address)+sockaddr_size); 795 addr->sadb_address_len = 796 (sizeof(struct sadb_address)+sockaddr_size)/ 797 sizeof(uint64_t); 798 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 799 /* "if the ports are non-zero, then the sadb_address_proto field, 800 normally zero, MUST be filled in with the transport 801 protocol's number." - RFC2367 */ 802 addr->sadb_address_proto = 0; 803 addr->sadb_address_reserved = 0; 804 if (x->props.family == AF_INET) { 805 addr->sadb_address_prefixlen = 32; 806 807 sin = (struct sockaddr_in *) (addr + 1); 808 sin->sin_family = AF_INET; 809 sin->sin_addr.s_addr = x->props.saddr.a4; 810 sin->sin_port = 0; 811 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 812 } 813 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 814 else if (x->props.family == AF_INET6) { 815 addr->sadb_address_prefixlen = 128; 816 817 sin6 = (struct sockaddr_in6 *) (addr + 1); 818 sin6->sin6_family = AF_INET6; 819 sin6->sin6_port = 0; 820 sin6->sin6_flowinfo = 0; 821 memcpy(&sin6->sin6_addr, x->props.saddr.a6, 822 sizeof(struct in6_addr)); 823 sin6->sin6_scope_id = 0; 824 } 825 #endif 826 else 827 BUG(); 828 829 /* dst address */ 830 addr = (struct sadb_address*) skb_put(skb, 831 sizeof(struct sadb_address)+sockaddr_size); 832 addr->sadb_address_len = 833 (sizeof(struct sadb_address)+sockaddr_size)/ 834 sizeof(uint64_t); 835 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 836 addr->sadb_address_proto = 0; 837 addr->sadb_address_prefixlen = 32; /* XXX */ 838 addr->sadb_address_reserved = 0; 839 if (x->props.family == AF_INET) { 840 sin = (struct sockaddr_in *) (addr + 1); 841 sin->sin_family = AF_INET; 842 sin->sin_addr.s_addr = x->id.daddr.a4; 843 sin->sin_port = 0; 844 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 845 846 if (x->sel.saddr.a4 != x->props.saddr.a4) { 847 addr = (struct sadb_address*) skb_put(skb, 848 sizeof(struct sadb_address)+sockaddr_size); 849 addr->sadb_address_len = 850 (sizeof(struct sadb_address)+sockaddr_size)/ 851 sizeof(uint64_t); 852 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 853 addr->sadb_address_proto = 854 pfkey_proto_from_xfrm(x->sel.proto); 855 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 856 addr->sadb_address_reserved = 0; 857 858 sin = (struct sockaddr_in *) (addr + 1); 859 sin->sin_family = AF_INET; 860 sin->sin_addr.s_addr = x->sel.saddr.a4; 861 sin->sin_port = x->sel.sport; 862 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 863 } 864 } 865 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 866 else if (x->props.family == AF_INET6) { 867 addr->sadb_address_prefixlen = 128; 868 869 sin6 = (struct sockaddr_in6 *) (addr + 1); 870 sin6->sin6_family = AF_INET6; 871 sin6->sin6_port = 0; 872 sin6->sin6_flowinfo = 0; 873 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); 874 sin6->sin6_scope_id = 0; 875 876 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, 877 sizeof(struct in6_addr))) { 878 addr = (struct sadb_address *) skb_put(skb, 879 sizeof(struct sadb_address)+sockaddr_size); 880 addr->sadb_address_len = 881 (sizeof(struct sadb_address)+sockaddr_size)/ 882 sizeof(uint64_t); 883 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 884 addr->sadb_address_proto = 885 pfkey_proto_from_xfrm(x->sel.proto); 886 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 887 addr->sadb_address_reserved = 0; 888 889 sin6 = (struct sockaddr_in6 *) (addr + 1); 890 sin6->sin6_family = AF_INET6; 891 sin6->sin6_port = x->sel.sport; 892 sin6->sin6_flowinfo = 0; 893 memcpy(&sin6->sin6_addr, x->sel.saddr.a6, 894 sizeof(struct in6_addr)); 895 sin6->sin6_scope_id = 0; 896 } 897 } 898 #endif 899 else 900 BUG(); 901 902 /* auth key */ 903 if (add_keys && auth_key_size) { 904 key = (struct sadb_key *) skb_put(skb, 905 sizeof(struct sadb_key)+auth_key_size); 906 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 907 sizeof(uint64_t); 908 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 909 key->sadb_key_bits = x->aalg->alg_key_len; 910 key->sadb_key_reserved = 0; 911 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 912 } 913 /* encrypt key */ 914 if (add_keys && encrypt_key_size) { 915 key = (struct sadb_key *) skb_put(skb, 916 sizeof(struct sadb_key)+encrypt_key_size); 917 key->sadb_key_len = (sizeof(struct sadb_key) + 918 encrypt_key_size) / sizeof(uint64_t); 919 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 920 key->sadb_key_bits = x->ealg->alg_key_len; 921 key->sadb_key_reserved = 0; 922 memcpy(key + 1, x->ealg->alg_key, 923 (x->ealg->alg_key_len+7)/8); 924 } 925 926 /* sa */ 927 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 928 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 929 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 930 sa2->sadb_x_sa2_mode = x->props.mode + 1; 931 sa2->sadb_x_sa2_reserved1 = 0; 932 sa2->sadb_x_sa2_reserved2 = 0; 933 sa2->sadb_x_sa2_sequence = 0; 934 sa2->sadb_x_sa2_reqid = x->props.reqid; 935 936 if (natt && natt->encap_type) { 937 struct sadb_x_nat_t_type *n_type; 938 struct sadb_x_nat_t_port *n_port; 939 940 /* type */ 941 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 942 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 943 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 944 n_type->sadb_x_nat_t_type_type = natt->encap_type; 945 n_type->sadb_x_nat_t_type_reserved[0] = 0; 946 n_type->sadb_x_nat_t_type_reserved[1] = 0; 947 n_type->sadb_x_nat_t_type_reserved[2] = 0; 948 949 /* source port */ 950 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 951 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 952 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 953 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 954 n_port->sadb_x_nat_t_port_reserved = 0; 955 956 /* dest port */ 957 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 958 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 959 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 960 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 961 n_port->sadb_x_nat_t_port_reserved = 0; 962 } 963 964 /* security context */ 965 if (xfrm_ctx) { 966 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 967 sizeof(struct sadb_x_sec_ctx) + ctx_size); 968 sec_ctx->sadb_x_sec_len = 969 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 970 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 971 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 972 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 973 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 974 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 975 xfrm_ctx->ctx_len); 976 } 977 978 return skb; 979 } 980 981 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, 982 void **ext_hdrs) 983 { 984 struct xfrm_state *x; 985 struct sadb_lifetime *lifetime; 986 struct sadb_sa *sa; 987 struct sadb_key *key; 988 struct sadb_x_sec_ctx *sec_ctx; 989 uint16_t proto; 990 int err; 991 992 993 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 994 if (!sa || 995 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 996 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 997 return ERR_PTR(-EINVAL); 998 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 999 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1000 return ERR_PTR(-EINVAL); 1001 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1002 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1003 return ERR_PTR(-EINVAL); 1004 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1005 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1006 return ERR_PTR(-EINVAL); 1007 1008 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1009 if (proto == 0) 1010 return ERR_PTR(-EINVAL); 1011 1012 /* default error is no buffer space */ 1013 err = -ENOBUFS; 1014 1015 /* RFC2367: 1016 1017 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1018 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1019 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1020 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1021 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1022 not true. 1023 1024 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1025 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1026 */ 1027 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1028 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1029 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1030 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1031 return ERR_PTR(-EINVAL); 1032 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1033 if (key != NULL && 1034 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1035 ((key->sadb_key_bits+7) / 8 == 0 || 1036 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1037 return ERR_PTR(-EINVAL); 1038 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1039 if (key != NULL && 1040 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1041 ((key->sadb_key_bits+7) / 8 == 0 || 1042 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1043 return ERR_PTR(-EINVAL); 1044 1045 x = xfrm_state_alloc(); 1046 if (x == NULL) 1047 return ERR_PTR(-ENOBUFS); 1048 1049 x->id.proto = proto; 1050 x->id.spi = sa->sadb_sa_spi; 1051 x->props.replay_window = sa->sadb_sa_replay; 1052 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1053 x->props.flags |= XFRM_STATE_NOECN; 1054 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1055 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1056 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1057 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1058 1059 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; 1060 if (lifetime != NULL) { 1061 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1062 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1063 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1064 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1065 } 1066 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; 1067 if (lifetime != NULL) { 1068 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1069 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1070 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1071 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1072 } 1073 1074 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 1075 if (sec_ctx != NULL) { 1076 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1077 1078 if (!uctx) 1079 goto out; 1080 1081 err = security_xfrm_state_alloc(x, uctx); 1082 kfree(uctx); 1083 1084 if (err) 1085 goto out; 1086 } 1087 1088 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1089 if (sa->sadb_sa_auth) { 1090 int keysize = 0; 1091 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1092 if (!a) { 1093 err = -ENOSYS; 1094 goto out; 1095 } 1096 if (key) 1097 keysize = (key->sadb_key_bits + 7) / 8; 1098 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1099 if (!x->aalg) 1100 goto out; 1101 strcpy(x->aalg->alg_name, a->name); 1102 x->aalg->alg_key_len = 0; 1103 if (key) { 1104 x->aalg->alg_key_len = key->sadb_key_bits; 1105 memcpy(x->aalg->alg_key, key+1, keysize); 1106 } 1107 x->props.aalgo = sa->sadb_sa_auth; 1108 /* x->algo.flags = sa->sadb_sa_flags; */ 1109 } 1110 if (sa->sadb_sa_encrypt) { 1111 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1112 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1113 if (!a) { 1114 err = -ENOSYS; 1115 goto out; 1116 } 1117 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1118 if (!x->calg) 1119 goto out; 1120 strcpy(x->calg->alg_name, a->name); 1121 x->props.calgo = sa->sadb_sa_encrypt; 1122 } else { 1123 int keysize = 0; 1124 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1125 if (!a) { 1126 err = -ENOSYS; 1127 goto out; 1128 } 1129 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1130 if (key) 1131 keysize = (key->sadb_key_bits + 7) / 8; 1132 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1133 if (!x->ealg) 1134 goto out; 1135 strcpy(x->ealg->alg_name, a->name); 1136 x->ealg->alg_key_len = 0; 1137 if (key) { 1138 x->ealg->alg_key_len = key->sadb_key_bits; 1139 memcpy(x->ealg->alg_key, key+1, keysize); 1140 } 1141 x->props.ealgo = sa->sadb_sa_encrypt; 1142 } 1143 } 1144 /* x->algo.flags = sa->sadb_sa_flags; */ 1145 1146 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1147 &x->props.saddr); 1148 if (!x->props.family) { 1149 err = -EAFNOSUPPORT; 1150 goto out; 1151 } 1152 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1153 &x->id.daddr); 1154 1155 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1156 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1157 x->props.mode = sa2->sadb_x_sa2_mode; 1158 if (x->props.mode) 1159 x->props.mode--; 1160 x->props.reqid = sa2->sadb_x_sa2_reqid; 1161 } 1162 1163 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1164 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1165 1166 /* Nobody uses this, but we try. */ 1167 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1168 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1169 } 1170 1171 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1172 struct sadb_x_nat_t_type* n_type; 1173 struct xfrm_encap_tmpl *natt; 1174 1175 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1176 if (!x->encap) 1177 goto out; 1178 1179 natt = x->encap; 1180 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1181 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1182 1183 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1184 struct sadb_x_nat_t_port* n_port = 1185 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1186 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1187 } 1188 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1189 struct sadb_x_nat_t_port* n_port = 1190 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1191 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1192 } 1193 } 1194 1195 err = xfrm_init_state(x); 1196 if (err) 1197 goto out; 1198 1199 x->km.seq = hdr->sadb_msg_seq; 1200 return x; 1201 1202 out: 1203 x->km.state = XFRM_STATE_DEAD; 1204 xfrm_state_put(x); 1205 return ERR_PTR(err); 1206 } 1207 1208 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1209 { 1210 return -EOPNOTSUPP; 1211 } 1212 1213 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1214 { 1215 struct sk_buff *resp_skb; 1216 struct sadb_x_sa2 *sa2; 1217 struct sadb_address *saddr, *daddr; 1218 struct sadb_msg *out_hdr; 1219 struct xfrm_state *x = NULL; 1220 u8 mode; 1221 u32 reqid; 1222 u8 proto; 1223 unsigned short family; 1224 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1225 1226 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1227 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1228 return -EINVAL; 1229 1230 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1231 if (proto == 0) 1232 return -EINVAL; 1233 1234 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1235 mode = sa2->sadb_x_sa2_mode - 1; 1236 reqid = sa2->sadb_x_sa2_reqid; 1237 } else { 1238 mode = 0; 1239 reqid = 0; 1240 } 1241 1242 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1243 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1244 1245 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1246 switch (family) { 1247 case AF_INET: 1248 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1249 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1250 break; 1251 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1252 case AF_INET6: 1253 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1254 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1255 break; 1256 #endif 1257 } 1258 1259 if (hdr->sadb_msg_seq) { 1260 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1261 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1262 xfrm_state_put(x); 1263 x = NULL; 1264 } 1265 } 1266 1267 if (!x) 1268 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); 1269 1270 if (x == NULL) 1271 return -ENOENT; 1272 1273 resp_skb = ERR_PTR(-ENOENT); 1274 1275 spin_lock_bh(&x->lock); 1276 if (x->km.state != XFRM_STATE_DEAD) { 1277 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1278 u32 min_spi, max_spi; 1279 1280 if (range != NULL) { 1281 min_spi = range->sadb_spirange_min; 1282 max_spi = range->sadb_spirange_max; 1283 } else { 1284 min_spi = 0x100; 1285 max_spi = 0x0fffffff; 1286 } 1287 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); 1288 if (x->id.spi) 1289 resp_skb = pfkey_xfrm_state2msg(x, 0, 3); 1290 } 1291 spin_unlock_bh(&x->lock); 1292 1293 if (IS_ERR(resp_skb)) { 1294 xfrm_state_put(x); 1295 return PTR_ERR(resp_skb); 1296 } 1297 1298 out_hdr = (struct sadb_msg *) resp_skb->data; 1299 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1300 out_hdr->sadb_msg_type = SADB_GETSPI; 1301 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1302 out_hdr->sadb_msg_errno = 0; 1303 out_hdr->sadb_msg_reserved = 0; 1304 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1305 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1306 1307 xfrm_state_put(x); 1308 1309 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); 1310 1311 return 0; 1312 } 1313 1314 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1315 { 1316 struct xfrm_state *x; 1317 1318 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1319 return -EOPNOTSUPP; 1320 1321 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1322 return 0; 1323 1324 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1325 if (x == NULL) 1326 return 0; 1327 1328 spin_lock_bh(&x->lock); 1329 if (x->km.state == XFRM_STATE_ACQ) { 1330 x->km.state = XFRM_STATE_ERROR; 1331 wake_up(&km_waitq); 1332 } 1333 spin_unlock_bh(&x->lock); 1334 xfrm_state_put(x); 1335 return 0; 1336 } 1337 1338 static inline int event2poltype(int event) 1339 { 1340 switch (event) { 1341 case XFRM_MSG_DELPOLICY: 1342 return SADB_X_SPDDELETE; 1343 case XFRM_MSG_NEWPOLICY: 1344 return SADB_X_SPDADD; 1345 case XFRM_MSG_UPDPOLICY: 1346 return SADB_X_SPDUPDATE; 1347 case XFRM_MSG_POLEXPIRE: 1348 // return SADB_X_SPDEXPIRE; 1349 default: 1350 printk("pfkey: Unknown policy event %d\n", event); 1351 break; 1352 } 1353 1354 return 0; 1355 } 1356 1357 static inline int event2keytype(int event) 1358 { 1359 switch (event) { 1360 case XFRM_MSG_DELSA: 1361 return SADB_DELETE; 1362 case XFRM_MSG_NEWSA: 1363 return SADB_ADD; 1364 case XFRM_MSG_UPDSA: 1365 return SADB_UPDATE; 1366 case XFRM_MSG_EXPIRE: 1367 return SADB_EXPIRE; 1368 default: 1369 printk("pfkey: Unknown SA event %d\n", event); 1370 break; 1371 } 1372 1373 return 0; 1374 } 1375 1376 /* ADD/UPD/DEL */ 1377 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1378 { 1379 struct sk_buff *skb; 1380 struct sadb_msg *hdr; 1381 int hsc = 3; 1382 1383 if (c->event == XFRM_MSG_DELSA) 1384 hsc = 0; 1385 1386 skb = pfkey_xfrm_state2msg(x, 0, hsc); 1387 1388 if (IS_ERR(skb)) 1389 return PTR_ERR(skb); 1390 1391 hdr = (struct sadb_msg *) skb->data; 1392 hdr->sadb_msg_version = PF_KEY_V2; 1393 hdr->sadb_msg_type = event2keytype(c->event); 1394 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1395 hdr->sadb_msg_errno = 0; 1396 hdr->sadb_msg_reserved = 0; 1397 hdr->sadb_msg_seq = c->seq; 1398 hdr->sadb_msg_pid = c->pid; 1399 1400 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1401 1402 return 0; 1403 } 1404 1405 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1406 { 1407 struct xfrm_state *x; 1408 int err; 1409 struct km_event c; 1410 1411 xfrm_probe_algs(); 1412 1413 x = pfkey_msg2xfrm_state(hdr, ext_hdrs); 1414 if (IS_ERR(x)) 1415 return PTR_ERR(x); 1416 1417 xfrm_state_hold(x); 1418 if (hdr->sadb_msg_type == SADB_ADD) 1419 err = xfrm_state_add(x); 1420 else 1421 err = xfrm_state_update(x); 1422 1423 if (err < 0) { 1424 x->km.state = XFRM_STATE_DEAD; 1425 __xfrm_state_put(x); 1426 goto out; 1427 } 1428 1429 if (hdr->sadb_msg_type == SADB_ADD) 1430 c.event = XFRM_MSG_NEWSA; 1431 else 1432 c.event = XFRM_MSG_UPDSA; 1433 c.seq = hdr->sadb_msg_seq; 1434 c.pid = hdr->sadb_msg_pid; 1435 km_state_notify(x, &c); 1436 out: 1437 xfrm_state_put(x); 1438 return err; 1439 } 1440 1441 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1442 { 1443 struct xfrm_state *x; 1444 struct km_event c; 1445 int err; 1446 1447 if (!ext_hdrs[SADB_EXT_SA-1] || 1448 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1449 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1450 return -EINVAL; 1451 1452 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1453 if (x == NULL) 1454 return -ESRCH; 1455 1456 if ((err = security_xfrm_state_delete(x))) 1457 goto out; 1458 1459 if (xfrm_state_kern(x)) { 1460 err = -EPERM; 1461 goto out; 1462 } 1463 1464 err = xfrm_state_delete(x); 1465 if (err < 0) 1466 goto out; 1467 1468 c.seq = hdr->sadb_msg_seq; 1469 c.pid = hdr->sadb_msg_pid; 1470 c.event = XFRM_MSG_DELSA; 1471 km_state_notify(x, &c); 1472 out: 1473 xfrm_state_put(x); 1474 1475 return err; 1476 } 1477 1478 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1479 { 1480 __u8 proto; 1481 struct sk_buff *out_skb; 1482 struct sadb_msg *out_hdr; 1483 struct xfrm_state *x; 1484 1485 if (!ext_hdrs[SADB_EXT_SA-1] || 1486 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1487 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1488 return -EINVAL; 1489 1490 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1491 if (x == NULL) 1492 return -ESRCH; 1493 1494 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1495 proto = x->id.proto; 1496 xfrm_state_put(x); 1497 if (IS_ERR(out_skb)) 1498 return PTR_ERR(out_skb); 1499 1500 out_hdr = (struct sadb_msg *) out_skb->data; 1501 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1502 out_hdr->sadb_msg_type = SADB_DUMP; 1503 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1504 out_hdr->sadb_msg_errno = 0; 1505 out_hdr->sadb_msg_reserved = 0; 1506 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1507 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1508 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 1509 1510 return 0; 1511 } 1512 1513 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1514 gfp_t allocation) 1515 { 1516 struct sk_buff *skb; 1517 struct sadb_msg *hdr; 1518 int len, auth_len, enc_len, i; 1519 1520 auth_len = xfrm_count_auth_supported(); 1521 if (auth_len) { 1522 auth_len *= sizeof(struct sadb_alg); 1523 auth_len += sizeof(struct sadb_supported); 1524 } 1525 1526 enc_len = xfrm_count_enc_supported(); 1527 if (enc_len) { 1528 enc_len *= sizeof(struct sadb_alg); 1529 enc_len += sizeof(struct sadb_supported); 1530 } 1531 1532 len = enc_len + auth_len + sizeof(struct sadb_msg); 1533 1534 skb = alloc_skb(len + 16, allocation); 1535 if (!skb) 1536 goto out_put_algs; 1537 1538 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1539 pfkey_hdr_dup(hdr, orig); 1540 hdr->sadb_msg_errno = 0; 1541 hdr->sadb_msg_len = len / sizeof(uint64_t); 1542 1543 if (auth_len) { 1544 struct sadb_supported *sp; 1545 struct sadb_alg *ap; 1546 1547 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1548 ap = (struct sadb_alg *) (sp + 1); 1549 1550 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1551 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1552 1553 for (i = 0; ; i++) { 1554 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1555 if (!aalg) 1556 break; 1557 if (aalg->available) 1558 *ap++ = aalg->desc; 1559 } 1560 } 1561 1562 if (enc_len) { 1563 struct sadb_supported *sp; 1564 struct sadb_alg *ap; 1565 1566 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1567 ap = (struct sadb_alg *) (sp + 1); 1568 1569 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1570 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1571 1572 for (i = 0; ; i++) { 1573 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1574 if (!ealg) 1575 break; 1576 if (ealg->available) 1577 *ap++ = ealg->desc; 1578 } 1579 } 1580 1581 out_put_algs: 1582 return skb; 1583 } 1584 1585 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1586 { 1587 struct pfkey_sock *pfk = pfkey_sk(sk); 1588 struct sk_buff *supp_skb; 1589 1590 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1591 return -EINVAL; 1592 1593 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1594 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1595 return -EEXIST; 1596 pfk->registered |= (1<<hdr->sadb_msg_satype); 1597 } 1598 1599 xfrm_probe_algs(); 1600 1601 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1602 if (!supp_skb) { 1603 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1604 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1605 1606 return -ENOBUFS; 1607 } 1608 1609 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); 1610 1611 return 0; 1612 } 1613 1614 static int key_notify_sa_flush(struct km_event *c) 1615 { 1616 struct sk_buff *skb; 1617 struct sadb_msg *hdr; 1618 1619 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1620 if (!skb) 1621 return -ENOBUFS; 1622 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1623 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1624 hdr->sadb_msg_type = SADB_FLUSH; 1625 hdr->sadb_msg_seq = c->seq; 1626 hdr->sadb_msg_pid = c->pid; 1627 hdr->sadb_msg_version = PF_KEY_V2; 1628 hdr->sadb_msg_errno = (uint8_t) 0; 1629 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1630 1631 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1632 1633 return 0; 1634 } 1635 1636 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1637 { 1638 unsigned proto; 1639 struct km_event c; 1640 1641 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1642 if (proto == 0) 1643 return -EINVAL; 1644 1645 xfrm_state_flush(proto); 1646 c.data.proto = proto; 1647 c.seq = hdr->sadb_msg_seq; 1648 c.pid = hdr->sadb_msg_pid; 1649 c.event = XFRM_MSG_FLUSHSA; 1650 km_state_notify(NULL, &c); 1651 1652 return 0; 1653 } 1654 1655 struct pfkey_dump_data 1656 { 1657 struct sk_buff *skb; 1658 struct sadb_msg *hdr; 1659 struct sock *sk; 1660 }; 1661 1662 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1663 { 1664 struct pfkey_dump_data *data = ptr; 1665 struct sk_buff *out_skb; 1666 struct sadb_msg *out_hdr; 1667 1668 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1669 if (IS_ERR(out_skb)) 1670 return PTR_ERR(out_skb); 1671 1672 out_hdr = (struct sadb_msg *) out_skb->data; 1673 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 1674 out_hdr->sadb_msg_type = SADB_DUMP; 1675 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1676 out_hdr->sadb_msg_errno = 0; 1677 out_hdr->sadb_msg_reserved = 0; 1678 out_hdr->sadb_msg_seq = count; 1679 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 1680 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 1681 return 0; 1682 } 1683 1684 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1685 { 1686 u8 proto; 1687 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 1688 1689 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1690 if (proto == 0) 1691 return -EINVAL; 1692 1693 return xfrm_state_walk(proto, dump_sa, &data); 1694 } 1695 1696 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1697 { 1698 struct pfkey_sock *pfk = pfkey_sk(sk); 1699 int satype = hdr->sadb_msg_satype; 1700 1701 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1702 /* XXX we mangle packet... */ 1703 hdr->sadb_msg_errno = 0; 1704 if (satype != 0 && satype != 1) 1705 return -EINVAL; 1706 pfk->promisc = satype; 1707 } 1708 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); 1709 return 0; 1710 } 1711 1712 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1713 { 1714 int i; 1715 u32 reqid = *(u32*)ptr; 1716 1717 for (i=0; i<xp->xfrm_nr; i++) { 1718 if (xp->xfrm_vec[i].reqid == reqid) 1719 return -EEXIST; 1720 } 1721 return 0; 1722 } 1723 1724 static u32 gen_reqid(void) 1725 { 1726 u32 start; 1727 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1728 1729 start = reqid; 1730 do { 1731 ++reqid; 1732 if (reqid == 0) 1733 reqid = IPSEC_MANUAL_REQID_MAX+1; 1734 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST) 1735 return reqid; 1736 } while (reqid != start); 1737 return 0; 1738 } 1739 1740 static int 1741 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1742 { 1743 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1744 struct sockaddr_in *sin; 1745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1746 struct sockaddr_in6 *sin6; 1747 #endif 1748 1749 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1750 return -ELOOP; 1751 1752 if (rq->sadb_x_ipsecrequest_mode == 0) 1753 return -EINVAL; 1754 1755 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1756 t->mode = rq->sadb_x_ipsecrequest_mode-1; 1757 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1758 t->optional = 1; 1759 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1760 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1761 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1762 t->reqid = 0; 1763 if (!t->reqid && !(t->reqid = gen_reqid())) 1764 return -ENOBUFS; 1765 } 1766 1767 /* addresses present only in tunnel mode */ 1768 if (t->mode) { 1769 switch (xp->family) { 1770 case AF_INET: 1771 sin = (void*)(rq+1); 1772 if (sin->sin_family != AF_INET) 1773 return -EINVAL; 1774 t->saddr.a4 = sin->sin_addr.s_addr; 1775 sin++; 1776 if (sin->sin_family != AF_INET) 1777 return -EINVAL; 1778 t->id.daddr.a4 = sin->sin_addr.s_addr; 1779 break; 1780 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1781 case AF_INET6: 1782 sin6 = (void *)(rq+1); 1783 if (sin6->sin6_family != AF_INET6) 1784 return -EINVAL; 1785 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1786 sin6++; 1787 if (sin6->sin6_family != AF_INET6) 1788 return -EINVAL; 1789 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1790 break; 1791 #endif 1792 default: 1793 return -EINVAL; 1794 } 1795 } 1796 /* No way to set this via kame pfkey */ 1797 t->aalgos = t->ealgos = t->calgos = ~0; 1798 xp->xfrm_nr++; 1799 return 0; 1800 } 1801 1802 static int 1803 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1804 { 1805 int err; 1806 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1807 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1808 1809 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1810 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1811 return err; 1812 len -= rq->sadb_x_ipsecrequest_len; 1813 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1814 } 1815 return 0; 1816 } 1817 1818 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1819 { 1820 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1821 1822 if (xfrm_ctx) { 1823 int len = sizeof(struct sadb_x_sec_ctx); 1824 len += xfrm_ctx->ctx_len; 1825 return PFKEY_ALIGN8(len); 1826 } 1827 return 0; 1828 } 1829 1830 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1831 { 1832 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1833 int socklen = (xp->family == AF_INET ? 1834 sizeof(struct sockaddr_in) : 1835 sizeof(struct sockaddr_in6)); 1836 1837 return sizeof(struct sadb_msg) + 1838 (sizeof(struct sadb_lifetime) * 3) + 1839 (sizeof(struct sadb_address) * 2) + 1840 (sockaddr_size * 2) + 1841 sizeof(struct sadb_x_policy) + 1842 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) + 1843 (socklen * 2))) + 1844 pfkey_xfrm_policy2sec_ctx_size(xp); 1845 } 1846 1847 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1848 { 1849 struct sk_buff *skb; 1850 int size; 1851 1852 size = pfkey_xfrm_policy2msg_size(xp); 1853 1854 skb = alloc_skb(size + 16, GFP_ATOMIC); 1855 if (skb == NULL) 1856 return ERR_PTR(-ENOBUFS); 1857 1858 return skb; 1859 } 1860 1861 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1862 { 1863 struct sadb_msg *hdr; 1864 struct sadb_address *addr; 1865 struct sadb_lifetime *lifetime; 1866 struct sadb_x_policy *pol; 1867 struct sockaddr_in *sin; 1868 struct sadb_x_sec_ctx *sec_ctx; 1869 struct xfrm_sec_ctx *xfrm_ctx; 1870 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1871 struct sockaddr_in6 *sin6; 1872 #endif 1873 int i; 1874 int size; 1875 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1876 int socklen = (xp->family == AF_INET ? 1877 sizeof(struct sockaddr_in) : 1878 sizeof(struct sockaddr_in6)); 1879 1880 size = pfkey_xfrm_policy2msg_size(xp); 1881 1882 /* call should fill header later */ 1883 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1884 memset(hdr, 0, size); /* XXX do we need this ? */ 1885 1886 /* src address */ 1887 addr = (struct sadb_address*) skb_put(skb, 1888 sizeof(struct sadb_address)+sockaddr_size); 1889 addr->sadb_address_len = 1890 (sizeof(struct sadb_address)+sockaddr_size)/ 1891 sizeof(uint64_t); 1892 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 1893 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1894 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 1895 addr->sadb_address_reserved = 0; 1896 /* src address */ 1897 if (xp->family == AF_INET) { 1898 sin = (struct sockaddr_in *) (addr + 1); 1899 sin->sin_family = AF_INET; 1900 sin->sin_addr.s_addr = xp->selector.saddr.a4; 1901 sin->sin_port = xp->selector.sport; 1902 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1903 } 1904 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1905 else if (xp->family == AF_INET6) { 1906 sin6 = (struct sockaddr_in6 *) (addr + 1); 1907 sin6->sin6_family = AF_INET6; 1908 sin6->sin6_port = xp->selector.sport; 1909 sin6->sin6_flowinfo = 0; 1910 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, 1911 sizeof(struct in6_addr)); 1912 sin6->sin6_scope_id = 0; 1913 } 1914 #endif 1915 else 1916 BUG(); 1917 1918 /* dst address */ 1919 addr = (struct sadb_address*) skb_put(skb, 1920 sizeof(struct sadb_address)+sockaddr_size); 1921 addr->sadb_address_len = 1922 (sizeof(struct sadb_address)+sockaddr_size)/ 1923 sizeof(uint64_t); 1924 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 1925 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1926 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 1927 addr->sadb_address_reserved = 0; 1928 if (xp->family == AF_INET) { 1929 sin = (struct sockaddr_in *) (addr + 1); 1930 sin->sin_family = AF_INET; 1931 sin->sin_addr.s_addr = xp->selector.daddr.a4; 1932 sin->sin_port = xp->selector.dport; 1933 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1934 } 1935 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1936 else if (xp->family == AF_INET6) { 1937 sin6 = (struct sockaddr_in6 *) (addr + 1); 1938 sin6->sin6_family = AF_INET6; 1939 sin6->sin6_port = xp->selector.dport; 1940 sin6->sin6_flowinfo = 0; 1941 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, 1942 sizeof(struct in6_addr)); 1943 sin6->sin6_scope_id = 0; 1944 } 1945 #endif 1946 else 1947 BUG(); 1948 1949 /* hard time */ 1950 lifetime = (struct sadb_lifetime *) skb_put(skb, 1951 sizeof(struct sadb_lifetime)); 1952 lifetime->sadb_lifetime_len = 1953 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1954 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 1955 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 1956 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 1957 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 1958 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 1959 /* soft time */ 1960 lifetime = (struct sadb_lifetime *) skb_put(skb, 1961 sizeof(struct sadb_lifetime)); 1962 lifetime->sadb_lifetime_len = 1963 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1964 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 1965 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 1966 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 1967 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 1968 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 1969 /* current 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_CURRENT; 1975 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 1976 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 1977 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 1978 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 1979 1980 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 1981 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 1982 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1983 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 1984 if (xp->action == XFRM_POLICY_ALLOW) { 1985 if (xp->xfrm_nr) 1986 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 1987 else 1988 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 1989 } 1990 pol->sadb_x_policy_dir = dir+1; 1991 pol->sadb_x_policy_id = xp->index; 1992 pol->sadb_x_policy_priority = xp->priority; 1993 1994 for (i=0; i<xp->xfrm_nr; i++) { 1995 struct sadb_x_ipsecrequest *rq; 1996 struct xfrm_tmpl *t = xp->xfrm_vec + i; 1997 int req_size; 1998 1999 req_size = sizeof(struct sadb_x_ipsecrequest); 2000 if (t->mode) 2001 req_size += 2*socklen; 2002 else 2003 size -= 2*socklen; 2004 rq = (void*)skb_put(skb, req_size); 2005 pol->sadb_x_policy_len += req_size/8; 2006 memset(rq, 0, sizeof(*rq)); 2007 rq->sadb_x_ipsecrequest_len = req_size; 2008 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2009 rq->sadb_x_ipsecrequest_mode = t->mode+1; 2010 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2011 if (t->reqid) 2012 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2013 if (t->optional) 2014 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2015 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2016 if (t->mode) { 2017 switch (xp->family) { 2018 case AF_INET: 2019 sin = (void*)(rq+1); 2020 sin->sin_family = AF_INET; 2021 sin->sin_addr.s_addr = t->saddr.a4; 2022 sin->sin_port = 0; 2023 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2024 sin++; 2025 sin->sin_family = AF_INET; 2026 sin->sin_addr.s_addr = t->id.daddr.a4; 2027 sin->sin_port = 0; 2028 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2029 break; 2030 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2031 case AF_INET6: 2032 sin6 = (void*)(rq+1); 2033 sin6->sin6_family = AF_INET6; 2034 sin6->sin6_port = 0; 2035 sin6->sin6_flowinfo = 0; 2036 memcpy(&sin6->sin6_addr, t->saddr.a6, 2037 sizeof(struct in6_addr)); 2038 sin6->sin6_scope_id = 0; 2039 2040 sin6++; 2041 sin6->sin6_family = AF_INET6; 2042 sin6->sin6_port = 0; 2043 sin6->sin6_flowinfo = 0; 2044 memcpy(&sin6->sin6_addr, t->id.daddr.a6, 2045 sizeof(struct in6_addr)); 2046 sin6->sin6_scope_id = 0; 2047 break; 2048 #endif 2049 default: 2050 break; 2051 } 2052 } 2053 } 2054 2055 /* security context */ 2056 if ((xfrm_ctx = xp->security)) { 2057 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2058 2059 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2060 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2061 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2062 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2063 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2064 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2065 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2066 xfrm_ctx->ctx_len); 2067 } 2068 2069 hdr->sadb_msg_len = size / sizeof(uint64_t); 2070 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2071 } 2072 2073 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2074 { 2075 struct sk_buff *out_skb; 2076 struct sadb_msg *out_hdr; 2077 int err; 2078 2079 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2080 if (IS_ERR(out_skb)) { 2081 err = PTR_ERR(out_skb); 2082 goto out; 2083 } 2084 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2085 2086 out_hdr = (struct sadb_msg *) out_skb->data; 2087 out_hdr->sadb_msg_version = PF_KEY_V2; 2088 2089 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2090 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2091 else 2092 out_hdr->sadb_msg_type = event2poltype(c->event); 2093 out_hdr->sadb_msg_errno = 0; 2094 out_hdr->sadb_msg_seq = c->seq; 2095 out_hdr->sadb_msg_pid = c->pid; 2096 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 2097 out: 2098 return 0; 2099 2100 } 2101 2102 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2103 { 2104 int err = 0; 2105 struct sadb_lifetime *lifetime; 2106 struct sadb_address *sa; 2107 struct sadb_x_policy *pol; 2108 struct xfrm_policy *xp; 2109 struct km_event c; 2110 struct sadb_x_sec_ctx *sec_ctx; 2111 2112 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2113 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2114 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2115 return -EINVAL; 2116 2117 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2118 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2119 return -EINVAL; 2120 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2121 return -EINVAL; 2122 2123 xp = xfrm_policy_alloc(GFP_KERNEL); 2124 if (xp == NULL) 2125 return -ENOBUFS; 2126 2127 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2128 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2129 xp->priority = pol->sadb_x_policy_priority; 2130 2131 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2132 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2133 if (!xp->family) { 2134 err = -EINVAL; 2135 goto out; 2136 } 2137 xp->selector.family = xp->family; 2138 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2139 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2140 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2141 if (xp->selector.sport) 2142 xp->selector.sport_mask = ~0; 2143 2144 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2145 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2146 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2147 2148 /* Amusing, we set this twice. KAME apps appear to set same value 2149 * in both addresses. 2150 */ 2151 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2152 2153 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2154 if (xp->selector.dport) 2155 xp->selector.dport_mask = ~0; 2156 2157 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2158 if (sec_ctx != NULL) { 2159 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2160 2161 if (!uctx) { 2162 err = -ENOBUFS; 2163 goto out; 2164 } 2165 2166 err = security_xfrm_policy_alloc(xp, uctx); 2167 kfree(uctx); 2168 2169 if (err) 2170 goto out; 2171 } 2172 2173 xp->lft.soft_byte_limit = XFRM_INF; 2174 xp->lft.hard_byte_limit = XFRM_INF; 2175 xp->lft.soft_packet_limit = XFRM_INF; 2176 xp->lft.hard_packet_limit = XFRM_INF; 2177 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2178 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2179 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2180 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2181 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2182 } 2183 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2184 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2185 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2186 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2187 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2188 } 2189 xp->xfrm_nr = 0; 2190 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2191 (err = parse_ipsecrequests(xp, pol)) < 0) 2192 goto out; 2193 2194 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2195 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2196 2197 if (err) 2198 goto out; 2199 2200 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2201 c.event = XFRM_MSG_UPDPOLICY; 2202 else 2203 c.event = XFRM_MSG_NEWPOLICY; 2204 2205 c.seq = hdr->sadb_msg_seq; 2206 c.pid = hdr->sadb_msg_pid; 2207 2208 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2209 xfrm_pol_put(xp); 2210 return 0; 2211 2212 out: 2213 security_xfrm_policy_free(xp); 2214 kfree(xp); 2215 return err; 2216 } 2217 2218 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2219 { 2220 int err; 2221 struct sadb_address *sa; 2222 struct sadb_x_policy *pol; 2223 struct xfrm_policy *xp, tmp; 2224 struct xfrm_selector sel; 2225 struct km_event c; 2226 struct sadb_x_sec_ctx *sec_ctx; 2227 2228 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2229 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2230 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2231 return -EINVAL; 2232 2233 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2234 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2235 return -EINVAL; 2236 2237 memset(&sel, 0, sizeof(sel)); 2238 2239 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2240 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2241 sel.prefixlen_s = sa->sadb_address_prefixlen; 2242 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2243 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2244 if (sel.sport) 2245 sel.sport_mask = ~0; 2246 2247 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2248 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2249 sel.prefixlen_d = sa->sadb_address_prefixlen; 2250 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2251 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2252 if (sel.dport) 2253 sel.dport_mask = ~0; 2254 2255 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2256 memset(&tmp, 0, sizeof(struct xfrm_policy)); 2257 2258 if (sec_ctx != NULL) { 2259 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2260 2261 if (!uctx) 2262 return -ENOMEM; 2263 2264 err = security_xfrm_policy_alloc(&tmp, uctx); 2265 kfree(uctx); 2266 2267 if (err) 2268 return err; 2269 } 2270 2271 xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1); 2272 security_xfrm_policy_free(&tmp); 2273 if (xp == NULL) 2274 return -ENOENT; 2275 2276 err = 0; 2277 2278 if ((err = security_xfrm_policy_delete(xp))) 2279 goto out; 2280 c.seq = hdr->sadb_msg_seq; 2281 c.pid = hdr->sadb_msg_pid; 2282 c.event = XFRM_MSG_DELPOLICY; 2283 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2284 2285 out: 2286 xfrm_pol_put(xp); 2287 return err; 2288 } 2289 2290 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2291 { 2292 int err; 2293 struct sk_buff *out_skb; 2294 struct sadb_msg *out_hdr; 2295 err = 0; 2296 2297 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2298 if (IS_ERR(out_skb)) { 2299 err = PTR_ERR(out_skb); 2300 goto out; 2301 } 2302 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2303 2304 out_hdr = (struct sadb_msg *) out_skb->data; 2305 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2306 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2307 out_hdr->sadb_msg_satype = 0; 2308 out_hdr->sadb_msg_errno = 0; 2309 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2310 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2311 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 2312 err = 0; 2313 2314 out: 2315 return err; 2316 } 2317 2318 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2319 { 2320 unsigned int dir; 2321 int err; 2322 struct sadb_x_policy *pol; 2323 struct xfrm_policy *xp; 2324 struct km_event c; 2325 2326 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2327 return -EINVAL; 2328 2329 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2330 if (dir >= XFRM_POLICY_MAX) 2331 return -EINVAL; 2332 2333 xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id, 2334 hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2335 if (xp == NULL) 2336 return -ENOENT; 2337 2338 err = 0; 2339 2340 c.seq = hdr->sadb_msg_seq; 2341 c.pid = hdr->sadb_msg_pid; 2342 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) { 2343 c.data.byid = 1; 2344 c.event = XFRM_MSG_DELPOLICY; 2345 km_policy_notify(xp, dir, &c); 2346 } else { 2347 err = key_pol_get_resp(sk, xp, hdr, dir); 2348 } 2349 2350 xfrm_pol_put(xp); 2351 return err; 2352 } 2353 2354 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2355 { 2356 struct pfkey_dump_data *data = ptr; 2357 struct sk_buff *out_skb; 2358 struct sadb_msg *out_hdr; 2359 2360 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2361 if (IS_ERR(out_skb)) 2362 return PTR_ERR(out_skb); 2363 2364 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2365 2366 out_hdr = (struct sadb_msg *) out_skb->data; 2367 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 2368 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2369 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2370 out_hdr->sadb_msg_errno = 0; 2371 out_hdr->sadb_msg_seq = count; 2372 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 2373 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 2374 return 0; 2375 } 2376 2377 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2378 { 2379 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 2380 2381 return xfrm_policy_walk(dump_sp, &data); 2382 } 2383 2384 static int key_notify_policy_flush(struct km_event *c) 2385 { 2386 struct sk_buff *skb_out; 2387 struct sadb_msg *hdr; 2388 2389 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2390 if (!skb_out) 2391 return -ENOBUFS; 2392 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2393 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2394 hdr->sadb_msg_seq = c->seq; 2395 hdr->sadb_msg_pid = c->pid; 2396 hdr->sadb_msg_version = PF_KEY_V2; 2397 hdr->sadb_msg_errno = (uint8_t) 0; 2398 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2399 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL); 2400 return 0; 2401 2402 } 2403 2404 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2405 { 2406 struct km_event c; 2407 2408 xfrm_policy_flush(); 2409 c.event = XFRM_MSG_FLUSHPOLICY; 2410 c.pid = hdr->sadb_msg_pid; 2411 c.seq = hdr->sadb_msg_seq; 2412 km_policy_notify(NULL, 0, &c); 2413 2414 return 0; 2415 } 2416 2417 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2418 struct sadb_msg *hdr, void **ext_hdrs); 2419 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2420 [SADB_RESERVED] = pfkey_reserved, 2421 [SADB_GETSPI] = pfkey_getspi, 2422 [SADB_UPDATE] = pfkey_add, 2423 [SADB_ADD] = pfkey_add, 2424 [SADB_DELETE] = pfkey_delete, 2425 [SADB_GET] = pfkey_get, 2426 [SADB_ACQUIRE] = pfkey_acquire, 2427 [SADB_REGISTER] = pfkey_register, 2428 [SADB_EXPIRE] = NULL, 2429 [SADB_FLUSH] = pfkey_flush, 2430 [SADB_DUMP] = pfkey_dump, 2431 [SADB_X_PROMISC] = pfkey_promisc, 2432 [SADB_X_PCHANGE] = NULL, 2433 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2434 [SADB_X_SPDADD] = pfkey_spdadd, 2435 [SADB_X_SPDDELETE] = pfkey_spddelete, 2436 [SADB_X_SPDGET] = pfkey_spdget, 2437 [SADB_X_SPDACQUIRE] = NULL, 2438 [SADB_X_SPDDUMP] = pfkey_spddump, 2439 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2440 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2441 [SADB_X_SPDDELETE2] = pfkey_spdget, 2442 }; 2443 2444 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2445 { 2446 void *ext_hdrs[SADB_EXT_MAX]; 2447 int err; 2448 2449 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2450 BROADCAST_PROMISC_ONLY, NULL); 2451 2452 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2453 err = parse_exthdrs(skb, hdr, ext_hdrs); 2454 if (!err) { 2455 err = -EOPNOTSUPP; 2456 if (pfkey_funcs[hdr->sadb_msg_type]) 2457 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2458 } 2459 return err; 2460 } 2461 2462 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2463 { 2464 struct sadb_msg *hdr = NULL; 2465 2466 if (skb->len < sizeof(*hdr)) { 2467 *errp = -EMSGSIZE; 2468 } else { 2469 hdr = (struct sadb_msg *) skb->data; 2470 if (hdr->sadb_msg_version != PF_KEY_V2 || 2471 hdr->sadb_msg_reserved != 0 || 2472 (hdr->sadb_msg_type <= SADB_RESERVED || 2473 hdr->sadb_msg_type > SADB_MAX)) { 2474 hdr = NULL; 2475 *errp = -EINVAL; 2476 } else if (hdr->sadb_msg_len != (skb->len / 2477 sizeof(uint64_t)) || 2478 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2479 sizeof(uint64_t))) { 2480 hdr = NULL; 2481 *errp = -EMSGSIZE; 2482 } else { 2483 *errp = 0; 2484 } 2485 } 2486 return hdr; 2487 } 2488 2489 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2490 { 2491 return t->aalgos & (1 << d->desc.sadb_alg_id); 2492 } 2493 2494 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2495 { 2496 return t->ealgos & (1 << d->desc.sadb_alg_id); 2497 } 2498 2499 static int count_ah_combs(struct xfrm_tmpl *t) 2500 { 2501 int i, sz = 0; 2502 2503 for (i = 0; ; i++) { 2504 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2505 if (!aalg) 2506 break; 2507 if (aalg_tmpl_set(t, aalg) && aalg->available) 2508 sz += sizeof(struct sadb_comb); 2509 } 2510 return sz + sizeof(struct sadb_prop); 2511 } 2512 2513 static int count_esp_combs(struct xfrm_tmpl *t) 2514 { 2515 int i, k, sz = 0; 2516 2517 for (i = 0; ; i++) { 2518 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2519 if (!ealg) 2520 break; 2521 2522 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2523 continue; 2524 2525 for (k = 1; ; k++) { 2526 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2527 if (!aalg) 2528 break; 2529 2530 if (aalg_tmpl_set(t, aalg) && aalg->available) 2531 sz += sizeof(struct sadb_comb); 2532 } 2533 } 2534 return sz + sizeof(struct sadb_prop); 2535 } 2536 2537 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2538 { 2539 struct sadb_prop *p; 2540 int i; 2541 2542 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2543 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2544 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2545 p->sadb_prop_replay = 32; 2546 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2547 2548 for (i = 0; ; i++) { 2549 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2550 if (!aalg) 2551 break; 2552 2553 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2554 struct sadb_comb *c; 2555 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2556 memset(c, 0, sizeof(*c)); 2557 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2558 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2559 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2560 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2561 c->sadb_comb_hard_addtime = 24*60*60; 2562 c->sadb_comb_soft_addtime = 20*60*60; 2563 c->sadb_comb_hard_usetime = 8*60*60; 2564 c->sadb_comb_soft_usetime = 7*60*60; 2565 } 2566 } 2567 } 2568 2569 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2570 { 2571 struct sadb_prop *p; 2572 int i, k; 2573 2574 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2575 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2576 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2577 p->sadb_prop_replay = 32; 2578 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2579 2580 for (i=0; ; i++) { 2581 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2582 if (!ealg) 2583 break; 2584 2585 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2586 continue; 2587 2588 for (k = 1; ; k++) { 2589 struct sadb_comb *c; 2590 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2591 if (!aalg) 2592 break; 2593 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2594 continue; 2595 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2596 memset(c, 0, sizeof(*c)); 2597 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2598 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2599 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2600 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2601 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2602 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2603 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2604 c->sadb_comb_hard_addtime = 24*60*60; 2605 c->sadb_comb_soft_addtime = 20*60*60; 2606 c->sadb_comb_hard_usetime = 8*60*60; 2607 c->sadb_comb_soft_usetime = 7*60*60; 2608 } 2609 } 2610 } 2611 2612 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2613 { 2614 return 0; 2615 } 2616 2617 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2618 { 2619 struct sk_buff *out_skb; 2620 struct sadb_msg *out_hdr; 2621 int hard; 2622 int hsc; 2623 2624 hard = c->data.hard; 2625 if (hard) 2626 hsc = 2; 2627 else 2628 hsc = 1; 2629 2630 out_skb = pfkey_xfrm_state2msg(x, 0, hsc); 2631 if (IS_ERR(out_skb)) 2632 return PTR_ERR(out_skb); 2633 2634 out_hdr = (struct sadb_msg *) out_skb->data; 2635 out_hdr->sadb_msg_version = PF_KEY_V2; 2636 out_hdr->sadb_msg_type = SADB_EXPIRE; 2637 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2638 out_hdr->sadb_msg_errno = 0; 2639 out_hdr->sadb_msg_reserved = 0; 2640 out_hdr->sadb_msg_seq = 0; 2641 out_hdr->sadb_msg_pid = 0; 2642 2643 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2644 return 0; 2645 } 2646 2647 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2648 { 2649 switch (c->event) { 2650 case XFRM_MSG_EXPIRE: 2651 return key_notify_sa_expire(x, c); 2652 case XFRM_MSG_DELSA: 2653 case XFRM_MSG_NEWSA: 2654 case XFRM_MSG_UPDSA: 2655 return key_notify_sa(x, c); 2656 case XFRM_MSG_FLUSHSA: 2657 return key_notify_sa_flush(c); 2658 case XFRM_MSG_NEWAE: /* not yet supported */ 2659 break; 2660 default: 2661 printk("pfkey: Unknown SA event %d\n", c->event); 2662 break; 2663 } 2664 2665 return 0; 2666 } 2667 2668 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2669 { 2670 switch (c->event) { 2671 case XFRM_MSG_POLEXPIRE: 2672 return key_notify_policy_expire(xp, c); 2673 case XFRM_MSG_DELPOLICY: 2674 case XFRM_MSG_NEWPOLICY: 2675 case XFRM_MSG_UPDPOLICY: 2676 return key_notify_policy(xp, dir, c); 2677 case XFRM_MSG_FLUSHPOLICY: 2678 return key_notify_policy_flush(c); 2679 default: 2680 printk("pfkey: Unknown policy event %d\n", c->event); 2681 break; 2682 } 2683 2684 return 0; 2685 } 2686 2687 static u32 get_acqseq(void) 2688 { 2689 u32 res; 2690 static u32 acqseq; 2691 static DEFINE_SPINLOCK(acqseq_lock); 2692 2693 spin_lock_bh(&acqseq_lock); 2694 res = (++acqseq ? : ++acqseq); 2695 spin_unlock_bh(&acqseq_lock); 2696 return res; 2697 } 2698 2699 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 2700 { 2701 struct sk_buff *skb; 2702 struct sadb_msg *hdr; 2703 struct sadb_address *addr; 2704 struct sadb_x_policy *pol; 2705 struct sockaddr_in *sin; 2706 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2707 struct sockaddr_in6 *sin6; 2708 #endif 2709 int sockaddr_size; 2710 int size; 2711 2712 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2713 if (!sockaddr_size) 2714 return -EINVAL; 2715 2716 size = sizeof(struct sadb_msg) + 2717 (sizeof(struct sadb_address) * 2) + 2718 (sockaddr_size * 2) + 2719 sizeof(struct sadb_x_policy); 2720 2721 if (x->id.proto == IPPROTO_AH) 2722 size += count_ah_combs(t); 2723 else if (x->id.proto == IPPROTO_ESP) 2724 size += count_esp_combs(t); 2725 2726 skb = alloc_skb(size + 16, GFP_ATOMIC); 2727 if (skb == NULL) 2728 return -ENOMEM; 2729 2730 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2731 hdr->sadb_msg_version = PF_KEY_V2; 2732 hdr->sadb_msg_type = SADB_ACQUIRE; 2733 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2734 hdr->sadb_msg_len = size / sizeof(uint64_t); 2735 hdr->sadb_msg_errno = 0; 2736 hdr->sadb_msg_reserved = 0; 2737 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2738 hdr->sadb_msg_pid = 0; 2739 2740 /* src address */ 2741 addr = (struct sadb_address*) skb_put(skb, 2742 sizeof(struct sadb_address)+sockaddr_size); 2743 addr->sadb_address_len = 2744 (sizeof(struct sadb_address)+sockaddr_size)/ 2745 sizeof(uint64_t); 2746 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2747 addr->sadb_address_proto = 0; 2748 addr->sadb_address_reserved = 0; 2749 if (x->props.family == AF_INET) { 2750 addr->sadb_address_prefixlen = 32; 2751 2752 sin = (struct sockaddr_in *) (addr + 1); 2753 sin->sin_family = AF_INET; 2754 sin->sin_addr.s_addr = x->props.saddr.a4; 2755 sin->sin_port = 0; 2756 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2757 } 2758 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2759 else if (x->props.family == AF_INET6) { 2760 addr->sadb_address_prefixlen = 128; 2761 2762 sin6 = (struct sockaddr_in6 *) (addr + 1); 2763 sin6->sin6_family = AF_INET6; 2764 sin6->sin6_port = 0; 2765 sin6->sin6_flowinfo = 0; 2766 memcpy(&sin6->sin6_addr, 2767 x->props.saddr.a6, sizeof(struct in6_addr)); 2768 sin6->sin6_scope_id = 0; 2769 } 2770 #endif 2771 else 2772 BUG(); 2773 2774 /* dst address */ 2775 addr = (struct sadb_address*) skb_put(skb, 2776 sizeof(struct sadb_address)+sockaddr_size); 2777 addr->sadb_address_len = 2778 (sizeof(struct sadb_address)+sockaddr_size)/ 2779 sizeof(uint64_t); 2780 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2781 addr->sadb_address_proto = 0; 2782 addr->sadb_address_reserved = 0; 2783 if (x->props.family == AF_INET) { 2784 addr->sadb_address_prefixlen = 32; 2785 2786 sin = (struct sockaddr_in *) (addr + 1); 2787 sin->sin_family = AF_INET; 2788 sin->sin_addr.s_addr = x->id.daddr.a4; 2789 sin->sin_port = 0; 2790 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2791 } 2792 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2793 else if (x->props.family == AF_INET6) { 2794 addr->sadb_address_prefixlen = 128; 2795 2796 sin6 = (struct sockaddr_in6 *) (addr + 1); 2797 sin6->sin6_family = AF_INET6; 2798 sin6->sin6_port = 0; 2799 sin6->sin6_flowinfo = 0; 2800 memcpy(&sin6->sin6_addr, 2801 x->id.daddr.a6, sizeof(struct in6_addr)); 2802 sin6->sin6_scope_id = 0; 2803 } 2804 #endif 2805 else 2806 BUG(); 2807 2808 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2809 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2810 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2811 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2812 pol->sadb_x_policy_dir = dir+1; 2813 pol->sadb_x_policy_id = xp->index; 2814 2815 /* Set sadb_comb's. */ 2816 if (x->id.proto == IPPROTO_AH) 2817 dump_ah_combs(skb, t); 2818 else if (x->id.proto == IPPROTO_ESP) 2819 dump_esp_combs(skb, t); 2820 2821 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2822 } 2823 2824 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt, 2825 u8 *data, int len, int *dir) 2826 { 2827 struct xfrm_policy *xp; 2828 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 2829 struct sadb_x_sec_ctx *sec_ctx; 2830 2831 switch (family) { 2832 case AF_INET: 2833 if (opt != IP_IPSEC_POLICY) { 2834 *dir = -EOPNOTSUPP; 2835 return NULL; 2836 } 2837 break; 2838 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2839 case AF_INET6: 2840 if (opt != IPV6_IPSEC_POLICY) { 2841 *dir = -EOPNOTSUPP; 2842 return NULL; 2843 } 2844 break; 2845 #endif 2846 default: 2847 *dir = -EINVAL; 2848 return NULL; 2849 } 2850 2851 *dir = -EINVAL; 2852 2853 if (len < sizeof(struct sadb_x_policy) || 2854 pol->sadb_x_policy_len*8 > len || 2855 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 2856 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 2857 return NULL; 2858 2859 xp = xfrm_policy_alloc(GFP_ATOMIC); 2860 if (xp == NULL) { 2861 *dir = -ENOBUFS; 2862 return NULL; 2863 } 2864 2865 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2866 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2867 2868 xp->lft.soft_byte_limit = XFRM_INF; 2869 xp->lft.hard_byte_limit = XFRM_INF; 2870 xp->lft.soft_packet_limit = XFRM_INF; 2871 xp->lft.hard_packet_limit = XFRM_INF; 2872 xp->family = family; 2873 2874 xp->xfrm_nr = 0; 2875 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2876 (*dir = parse_ipsecrequests(xp, pol)) < 0) 2877 goto out; 2878 2879 /* security context too */ 2880 if (len >= (pol->sadb_x_policy_len*8 + 2881 sizeof(struct sadb_x_sec_ctx))) { 2882 char *p = (char *)pol; 2883 struct xfrm_user_sec_ctx *uctx; 2884 2885 p += pol->sadb_x_policy_len*8; 2886 sec_ctx = (struct sadb_x_sec_ctx *)p; 2887 if (len < pol->sadb_x_policy_len*8 + 2888 sec_ctx->sadb_x_sec_len) 2889 goto out; 2890 if ((*dir = verify_sec_ctx_len(p))) 2891 goto out; 2892 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2893 *dir = security_xfrm_policy_alloc(xp, uctx); 2894 kfree(uctx); 2895 2896 if (*dir) 2897 goto out; 2898 } 2899 2900 *dir = pol->sadb_x_policy_dir-1; 2901 return xp; 2902 2903 out: 2904 security_xfrm_policy_free(xp); 2905 kfree(xp); 2906 return NULL; 2907 } 2908 2909 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) 2910 { 2911 struct sk_buff *skb; 2912 struct sadb_msg *hdr; 2913 struct sadb_sa *sa; 2914 struct sadb_address *addr; 2915 struct sadb_x_nat_t_port *n_port; 2916 struct sockaddr_in *sin; 2917 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2918 struct sockaddr_in6 *sin6; 2919 #endif 2920 int sockaddr_size; 2921 int size; 2922 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 2923 struct xfrm_encap_tmpl *natt = NULL; 2924 2925 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2926 if (!sockaddr_size) 2927 return -EINVAL; 2928 2929 if (!satype) 2930 return -EINVAL; 2931 2932 if (!x->encap) 2933 return -EINVAL; 2934 2935 natt = x->encap; 2936 2937 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 2938 * 2939 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 2940 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 2941 */ 2942 2943 size = sizeof(struct sadb_msg) + 2944 sizeof(struct sadb_sa) + 2945 (sizeof(struct sadb_address) * 2) + 2946 (sockaddr_size * 2) + 2947 (sizeof(struct sadb_x_nat_t_port) * 2); 2948 2949 skb = alloc_skb(size + 16, GFP_ATOMIC); 2950 if (skb == NULL) 2951 return -ENOMEM; 2952 2953 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2954 hdr->sadb_msg_version = PF_KEY_V2; 2955 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 2956 hdr->sadb_msg_satype = satype; 2957 hdr->sadb_msg_len = size / sizeof(uint64_t); 2958 hdr->sadb_msg_errno = 0; 2959 hdr->sadb_msg_reserved = 0; 2960 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2961 hdr->sadb_msg_pid = 0; 2962 2963 /* SA */ 2964 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 2965 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 2966 sa->sadb_sa_exttype = SADB_EXT_SA; 2967 sa->sadb_sa_spi = x->id.spi; 2968 sa->sadb_sa_replay = 0; 2969 sa->sadb_sa_state = 0; 2970 sa->sadb_sa_auth = 0; 2971 sa->sadb_sa_encrypt = 0; 2972 sa->sadb_sa_flags = 0; 2973 2974 /* ADDRESS_SRC (old addr) */ 2975 addr = (struct sadb_address*) 2976 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 2977 addr->sadb_address_len = 2978 (sizeof(struct sadb_address)+sockaddr_size)/ 2979 sizeof(uint64_t); 2980 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2981 addr->sadb_address_proto = 0; 2982 addr->sadb_address_reserved = 0; 2983 if (x->props.family == AF_INET) { 2984 addr->sadb_address_prefixlen = 32; 2985 2986 sin = (struct sockaddr_in *) (addr + 1); 2987 sin->sin_family = AF_INET; 2988 sin->sin_addr.s_addr = x->props.saddr.a4; 2989 sin->sin_port = 0; 2990 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2991 } 2992 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2993 else if (x->props.family == AF_INET6) { 2994 addr->sadb_address_prefixlen = 128; 2995 2996 sin6 = (struct sockaddr_in6 *) (addr + 1); 2997 sin6->sin6_family = AF_INET6; 2998 sin6->sin6_port = 0; 2999 sin6->sin6_flowinfo = 0; 3000 memcpy(&sin6->sin6_addr, 3001 x->props.saddr.a6, sizeof(struct in6_addr)); 3002 sin6->sin6_scope_id = 0; 3003 } 3004 #endif 3005 else 3006 BUG(); 3007 3008 /* NAT_T_SPORT (old port) */ 3009 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3010 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3011 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3012 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3013 n_port->sadb_x_nat_t_port_reserved = 0; 3014 3015 /* ADDRESS_DST (new addr) */ 3016 addr = (struct sadb_address*) 3017 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3018 addr->sadb_address_len = 3019 (sizeof(struct sadb_address)+sockaddr_size)/ 3020 sizeof(uint64_t); 3021 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3022 addr->sadb_address_proto = 0; 3023 addr->sadb_address_reserved = 0; 3024 if (x->props.family == AF_INET) { 3025 addr->sadb_address_prefixlen = 32; 3026 3027 sin = (struct sockaddr_in *) (addr + 1); 3028 sin->sin_family = AF_INET; 3029 sin->sin_addr.s_addr = ipaddr->a4; 3030 sin->sin_port = 0; 3031 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3032 } 3033 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3034 else if (x->props.family == AF_INET6) { 3035 addr->sadb_address_prefixlen = 128; 3036 3037 sin6 = (struct sockaddr_in6 *) (addr + 1); 3038 sin6->sin6_family = AF_INET6; 3039 sin6->sin6_port = 0; 3040 sin6->sin6_flowinfo = 0; 3041 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); 3042 sin6->sin6_scope_id = 0; 3043 } 3044 #endif 3045 else 3046 BUG(); 3047 3048 /* NAT_T_DPORT (new port) */ 3049 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3050 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3051 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3052 n_port->sadb_x_nat_t_port_port = sport; 3053 n_port->sadb_x_nat_t_port_reserved = 0; 3054 3055 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 3056 } 3057 3058 static int pfkey_sendmsg(struct kiocb *kiocb, 3059 struct socket *sock, struct msghdr *msg, size_t len) 3060 { 3061 struct sock *sk = sock->sk; 3062 struct sk_buff *skb = NULL; 3063 struct sadb_msg *hdr = NULL; 3064 int err; 3065 3066 err = -EOPNOTSUPP; 3067 if (msg->msg_flags & MSG_OOB) 3068 goto out; 3069 3070 err = -EMSGSIZE; 3071 if ((unsigned)len > sk->sk_sndbuf - 32) 3072 goto out; 3073 3074 err = -ENOBUFS; 3075 skb = alloc_skb(len, GFP_KERNEL); 3076 if (skb == NULL) 3077 goto out; 3078 3079 err = -EFAULT; 3080 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3081 goto out; 3082 3083 hdr = pfkey_get_base_msg(skb, &err); 3084 if (!hdr) 3085 goto out; 3086 3087 mutex_lock(&xfrm_cfg_mutex); 3088 err = pfkey_process(sk, skb, hdr); 3089 mutex_unlock(&xfrm_cfg_mutex); 3090 3091 out: 3092 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3093 err = 0; 3094 if (skb) 3095 kfree_skb(skb); 3096 3097 return err ? : len; 3098 } 3099 3100 static int pfkey_recvmsg(struct kiocb *kiocb, 3101 struct socket *sock, struct msghdr *msg, size_t len, 3102 int flags) 3103 { 3104 struct sock *sk = sock->sk; 3105 struct sk_buff *skb; 3106 int copied, err; 3107 3108 err = -EINVAL; 3109 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3110 goto out; 3111 3112 msg->msg_namelen = 0; 3113 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3114 if (skb == NULL) 3115 goto out; 3116 3117 copied = skb->len; 3118 if (copied > len) { 3119 msg->msg_flags |= MSG_TRUNC; 3120 copied = len; 3121 } 3122 3123 skb->h.raw = skb->data; 3124 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3125 if (err) 3126 goto out_free; 3127 3128 sock_recv_timestamp(msg, sk, skb); 3129 3130 err = (flags & MSG_TRUNC) ? skb->len : copied; 3131 3132 out_free: 3133 skb_free_datagram(sk, skb); 3134 out: 3135 return err; 3136 } 3137 3138 static const struct proto_ops pfkey_ops = { 3139 .family = PF_KEY, 3140 .owner = THIS_MODULE, 3141 /* Operations that make no sense on pfkey sockets. */ 3142 .bind = sock_no_bind, 3143 .connect = sock_no_connect, 3144 .socketpair = sock_no_socketpair, 3145 .accept = sock_no_accept, 3146 .getname = sock_no_getname, 3147 .ioctl = sock_no_ioctl, 3148 .listen = sock_no_listen, 3149 .shutdown = sock_no_shutdown, 3150 .setsockopt = sock_no_setsockopt, 3151 .getsockopt = sock_no_getsockopt, 3152 .mmap = sock_no_mmap, 3153 .sendpage = sock_no_sendpage, 3154 3155 /* Now the operations that really occur. */ 3156 .release = pfkey_release, 3157 .poll = datagram_poll, 3158 .sendmsg = pfkey_sendmsg, 3159 .recvmsg = pfkey_recvmsg, 3160 }; 3161 3162 static struct net_proto_family pfkey_family_ops = { 3163 .family = PF_KEY, 3164 .create = pfkey_create, 3165 .owner = THIS_MODULE, 3166 }; 3167 3168 #ifdef CONFIG_PROC_FS 3169 static int pfkey_read_proc(char *buffer, char **start, off_t offset, 3170 int length, int *eof, void *data) 3171 { 3172 off_t pos = 0; 3173 off_t begin = 0; 3174 int len = 0; 3175 struct sock *s; 3176 struct hlist_node *node; 3177 3178 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); 3179 3180 read_lock(&pfkey_table_lock); 3181 3182 sk_for_each(s, node, &pfkey_table) { 3183 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", 3184 s, 3185 atomic_read(&s->sk_refcnt), 3186 atomic_read(&s->sk_rmem_alloc), 3187 atomic_read(&s->sk_wmem_alloc), 3188 sock_i_uid(s), 3189 sock_i_ino(s) 3190 ); 3191 3192 buffer[len++] = '\n'; 3193 3194 pos = begin + len; 3195 if (pos < offset) { 3196 len = 0; 3197 begin = pos; 3198 } 3199 if(pos > offset + length) 3200 goto done; 3201 } 3202 *eof = 1; 3203 3204 done: 3205 read_unlock(&pfkey_table_lock); 3206 3207 *start = buffer + (offset - begin); 3208 len -= (offset - begin); 3209 3210 if (len > length) 3211 len = length; 3212 if (len < 0) 3213 len = 0; 3214 3215 return len; 3216 } 3217 #endif 3218 3219 static struct xfrm_mgr pfkeyv2_mgr = 3220 { 3221 .id = "pfkeyv2", 3222 .notify = pfkey_send_notify, 3223 .acquire = pfkey_send_acquire, 3224 .compile_policy = pfkey_compile_policy, 3225 .new_mapping = pfkey_send_new_mapping, 3226 .notify_policy = pfkey_send_policy_notify, 3227 }; 3228 3229 static void __exit ipsec_pfkey_exit(void) 3230 { 3231 xfrm_unregister_km(&pfkeyv2_mgr); 3232 remove_proc_entry("net/pfkey", NULL); 3233 sock_unregister(PF_KEY); 3234 proto_unregister(&key_proto); 3235 } 3236 3237 static int __init ipsec_pfkey_init(void) 3238 { 3239 int err = proto_register(&key_proto, 0); 3240 3241 if (err != 0) 3242 goto out; 3243 3244 err = sock_register(&pfkey_family_ops); 3245 if (err != 0) 3246 goto out_unregister_key_proto; 3247 #ifdef CONFIG_PROC_FS 3248 err = -ENOMEM; 3249 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) 3250 goto out_sock_unregister; 3251 #endif 3252 err = xfrm_register_km(&pfkeyv2_mgr); 3253 if (err != 0) 3254 goto out_remove_proc_entry; 3255 out: 3256 return err; 3257 out_remove_proc_entry: 3258 #ifdef CONFIG_PROC_FS 3259 remove_proc_entry("net/pfkey", NULL); 3260 out_sock_unregister: 3261 #endif 3262 sock_unregister(PF_KEY); 3263 out_unregister_key_proto: 3264 proto_unregister(&key_proto); 3265 goto out; 3266 } 3267 3268 module_init(ipsec_pfkey_init); 3269 module_exit(ipsec_pfkey_exit); 3270 MODULE_LICENSE("GPL"); 3271 MODULE_ALIAS_NETPROTO(PF_KEY); 3272