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/config.h> 18 #include <linux/capability.h> 19 #include <linux/module.h> 20 #include <linux/kernel.h> 21 #include <linux/socket.h> 22 #include <linux/pfkeyv2.h> 23 #include <linux/ipsec.h> 24 #include <linux/skbuff.h> 25 #include <linux/rtnetlink.h> 26 #include <linux/in.h> 27 #include <linux/in6.h> 28 #include <linux/proc_fs.h> 29 #include <linux/init.h> 30 #include <net/xfrm.h> 31 32 #include <net/sock.h> 33 34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 36 37 38 /* List of all pfkey sockets. */ 39 static HLIST_HEAD(pfkey_table); 40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); 41 static DEFINE_RWLOCK(pfkey_table_lock); 42 static atomic_t pfkey_table_users = ATOMIC_INIT(0); 43 44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); 45 46 struct pfkey_sock { 47 /* struct sock must be the first member of struct pfkey_sock */ 48 struct sock sk; 49 int registered; 50 int promisc; 51 }; 52 53 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 54 { 55 return (struct pfkey_sock *)sk; 56 } 57 58 static void pfkey_sock_destruct(struct sock *sk) 59 { 60 skb_queue_purge(&sk->sk_receive_queue); 61 62 if (!sock_flag(sk, SOCK_DEAD)) { 63 printk("Attempt to release alive pfkey socket: %p\n", sk); 64 return; 65 } 66 67 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 68 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 69 70 atomic_dec(&pfkey_socks_nr); 71 } 72 73 static void pfkey_table_grab(void) 74 { 75 write_lock_bh(&pfkey_table_lock); 76 77 if (atomic_read(&pfkey_table_users)) { 78 DECLARE_WAITQUEUE(wait, current); 79 80 add_wait_queue_exclusive(&pfkey_table_wait, &wait); 81 for(;;) { 82 set_current_state(TASK_UNINTERRUPTIBLE); 83 if (atomic_read(&pfkey_table_users) == 0) 84 break; 85 write_unlock_bh(&pfkey_table_lock); 86 schedule(); 87 write_lock_bh(&pfkey_table_lock); 88 } 89 90 __set_current_state(TASK_RUNNING); 91 remove_wait_queue(&pfkey_table_wait, &wait); 92 } 93 } 94 95 static __inline__ void pfkey_table_ungrab(void) 96 { 97 write_unlock_bh(&pfkey_table_lock); 98 wake_up(&pfkey_table_wait); 99 } 100 101 static __inline__ void pfkey_lock_table(void) 102 { 103 /* read_lock() synchronizes us to pfkey_table_grab */ 104 105 read_lock(&pfkey_table_lock); 106 atomic_inc(&pfkey_table_users); 107 read_unlock(&pfkey_table_lock); 108 } 109 110 static __inline__ void pfkey_unlock_table(void) 111 { 112 if (atomic_dec_and_test(&pfkey_table_users)) 113 wake_up(&pfkey_table_wait); 114 } 115 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 pfkey_table_grab(); 122 sk_add_node(sk, &pfkey_table); 123 pfkey_table_ungrab(); 124 } 125 126 static void pfkey_remove(struct sock *sk) 127 { 128 pfkey_table_grab(); 129 sk_del_node_init(sk); 130 pfkey_table_ungrab(); 131 } 132 133 static struct proto key_proto = { 134 .name = "KEY", 135 .owner = THIS_MODULE, 136 .obj_size = sizeof(struct pfkey_sock), 137 }; 138 139 static int pfkey_create(struct socket *sock, int protocol) 140 { 141 struct sock *sk; 142 int err; 143 144 if (!capable(CAP_NET_ADMIN)) 145 return -EPERM; 146 if (sock->type != SOCK_RAW) 147 return -ESOCKTNOSUPPORT; 148 if (protocol != PF_KEY_V2) 149 return -EPROTONOSUPPORT; 150 151 err = -ENOMEM; 152 sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1); 153 if (sk == NULL) 154 goto out; 155 156 sock->ops = &pfkey_ops; 157 sock_init_data(sock, sk); 158 159 sk->sk_family = PF_KEY; 160 sk->sk_destruct = pfkey_sock_destruct; 161 162 atomic_inc(&pfkey_socks_nr); 163 164 pfkey_insert(sk); 165 166 return 0; 167 out: 168 return err; 169 } 170 171 static int pfkey_release(struct socket *sock) 172 { 173 struct sock *sk = sock->sk; 174 175 if (!sk) 176 return 0; 177 178 pfkey_remove(sk); 179 180 sock_orphan(sk); 181 sock->sk = NULL; 182 skb_queue_purge(&sk->sk_write_queue); 183 sock_put(sk); 184 185 return 0; 186 } 187 188 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 189 gfp_t allocation, struct sock *sk) 190 { 191 int err = -ENOBUFS; 192 193 sock_hold(sk); 194 if (*skb2 == NULL) { 195 if (atomic_read(&skb->users) != 1) { 196 *skb2 = skb_clone(skb, allocation); 197 } else { 198 *skb2 = skb; 199 atomic_inc(&skb->users); 200 } 201 } 202 if (*skb2 != NULL) { 203 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 204 skb_orphan(*skb2); 205 skb_set_owner_r(*skb2, sk); 206 skb_queue_tail(&sk->sk_receive_queue, *skb2); 207 sk->sk_data_ready(sk, (*skb2)->len); 208 *skb2 = NULL; 209 err = 0; 210 } 211 } 212 sock_put(sk); 213 return err; 214 } 215 216 /* Send SKB to all pfkey sockets matching selected criteria. */ 217 #define BROADCAST_ALL 0 218 #define BROADCAST_ONE 1 219 #define BROADCAST_REGISTERED 2 220 #define BROADCAST_PROMISC_ONLY 4 221 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 222 int broadcast_flags, struct sock *one_sk) 223 { 224 struct sock *sk; 225 struct hlist_node *node; 226 struct sk_buff *skb2 = NULL; 227 int err = -ESRCH; 228 229 /* XXX Do we need something like netlink_overrun? I think 230 * XXX PF_KEY socket apps will not mind current behavior. 231 */ 232 if (!skb) 233 return -ENOMEM; 234 235 pfkey_lock_table(); 236 sk_for_each(sk, node, &pfkey_table) { 237 struct pfkey_sock *pfk = pfkey_sk(sk); 238 int err2; 239 240 /* Yes, it means that if you are meant to receive this 241 * pfkey message you receive it twice as promiscuous 242 * socket. 243 */ 244 if (pfk->promisc) 245 pfkey_broadcast_one(skb, &skb2, allocation, sk); 246 247 /* the exact target will be processed later */ 248 if (sk == one_sk) 249 continue; 250 if (broadcast_flags != BROADCAST_ALL) { 251 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 252 continue; 253 if ((broadcast_flags & BROADCAST_REGISTERED) && 254 !pfk->registered) 255 continue; 256 if (broadcast_flags & BROADCAST_ONE) 257 continue; 258 } 259 260 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 261 262 /* Error is cleare after succecful sending to at least one 263 * registered KM */ 264 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 265 err = err2; 266 } 267 pfkey_unlock_table(); 268 269 if (one_sk != NULL) 270 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 271 272 if (skb2) 273 kfree_skb(skb2); 274 kfree_skb(skb); 275 return err; 276 } 277 278 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) 279 { 280 *new = *orig; 281 } 282 283 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) 284 { 285 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 286 struct sadb_msg *hdr; 287 288 if (!skb) 289 return -ENOBUFS; 290 291 /* Woe be to the platform trying to support PFKEY yet 292 * having normal errnos outside the 1-255 range, inclusive. 293 */ 294 err = -err; 295 if (err == ERESTARTSYS || 296 err == ERESTARTNOHAND || 297 err == ERESTARTNOINTR) 298 err = EINTR; 299 if (err >= 512) 300 err = EINVAL; 301 BUG_ON(err <= 0 || err >= 256); 302 303 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 304 pfkey_hdr_dup(hdr, orig); 305 hdr->sadb_msg_errno = (uint8_t) err; 306 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 307 sizeof(uint64_t)); 308 309 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); 310 311 return 0; 312 } 313 314 static u8 sadb_ext_min_len[] = { 315 [SADB_EXT_RESERVED] = (u8) 0, 316 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 317 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 318 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 319 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 320 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 321 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 322 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 323 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 324 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 325 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 326 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 327 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 328 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 329 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 330 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 331 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 332 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 333 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 334 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 335 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 336 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 337 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 338 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 339 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 340 }; 341 342 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 343 static int verify_address_len(void *p) 344 { 345 struct sadb_address *sp = p; 346 struct sockaddr *addr = (struct sockaddr *)(sp + 1); 347 struct sockaddr_in *sin; 348 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 349 struct sockaddr_in6 *sin6; 350 #endif 351 int len; 352 353 switch (addr->sa_family) { 354 case AF_INET: 355 len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); 356 len /= sizeof(uint64_t); 357 if (sp->sadb_address_len != len || 358 sp->sadb_address_prefixlen > 32) 359 return -EINVAL; 360 break; 361 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 362 case AF_INET6: 363 len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); 364 len /= sizeof(uint64_t); 365 if (sp->sadb_address_len != len || 366 sp->sadb_address_prefixlen > 128) 367 return -EINVAL; 368 break; 369 #endif 370 default: 371 /* It is user using kernel to keep track of security 372 * associations for another protocol, such as 373 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 374 * lengths. 375 * 376 * XXX Actually, association/policy database is not yet 377 * XXX able to cope with arbitrary sockaddr families. 378 * XXX When it can, remove this -EINVAL. -DaveM 379 */ 380 return -EINVAL; 381 break; 382 }; 383 384 return 0; 385 } 386 387 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) 388 { 389 int len = 0; 390 391 len += sizeof(struct sadb_x_sec_ctx); 392 len += sec_ctx->sadb_x_ctx_len; 393 len += sizeof(uint64_t) - 1; 394 len /= sizeof(uint64_t); 395 396 return len; 397 } 398 399 static inline int verify_sec_ctx_len(void *p) 400 { 401 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; 402 int len; 403 404 if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE) 405 return -EINVAL; 406 407 len = pfkey_sec_ctx_len(sec_ctx); 408 409 if (sec_ctx->sadb_x_sec_len != len) 410 return -EINVAL; 411 412 return 0; 413 } 414 415 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) 416 { 417 struct xfrm_user_sec_ctx *uctx = NULL; 418 int ctx_size = sec_ctx->sadb_x_ctx_len; 419 420 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); 421 422 if (!uctx) 423 return NULL; 424 425 uctx->len = pfkey_sec_ctx_len(sec_ctx); 426 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 427 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 428 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 429 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 430 memcpy(uctx + 1, sec_ctx + 1, 431 uctx->ctx_len); 432 433 return uctx; 434 } 435 436 static int present_and_same_family(struct sadb_address *src, 437 struct sadb_address *dst) 438 { 439 struct sockaddr *s_addr, *d_addr; 440 441 if (!src || !dst) 442 return 0; 443 444 s_addr = (struct sockaddr *)(src + 1); 445 d_addr = (struct sockaddr *)(dst + 1); 446 if (s_addr->sa_family != d_addr->sa_family) 447 return 0; 448 if (s_addr->sa_family != AF_INET 449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 450 && s_addr->sa_family != AF_INET6 451 #endif 452 ) 453 return 0; 454 455 return 1; 456 } 457 458 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 459 { 460 char *p = (char *) hdr; 461 int len = skb->len; 462 463 len -= sizeof(*hdr); 464 p += sizeof(*hdr); 465 while (len > 0) { 466 struct sadb_ext *ehdr = (struct sadb_ext *) p; 467 uint16_t ext_type; 468 int ext_len; 469 470 ext_len = ehdr->sadb_ext_len; 471 ext_len *= sizeof(uint64_t); 472 ext_type = ehdr->sadb_ext_type; 473 if (ext_len < sizeof(uint64_t) || 474 ext_len > len || 475 ext_type == SADB_EXT_RESERVED) 476 return -EINVAL; 477 478 if (ext_type <= SADB_EXT_MAX) { 479 int min = (int) sadb_ext_min_len[ext_type]; 480 if (ext_len < min) 481 return -EINVAL; 482 if (ext_hdrs[ext_type-1] != NULL) 483 return -EINVAL; 484 if (ext_type == SADB_EXT_ADDRESS_SRC || 485 ext_type == SADB_EXT_ADDRESS_DST || 486 ext_type == SADB_EXT_ADDRESS_PROXY || 487 ext_type == SADB_X_EXT_NAT_T_OA) { 488 if (verify_address_len(p)) 489 return -EINVAL; 490 } 491 if (ext_type == SADB_X_EXT_SEC_CTX) { 492 if (verify_sec_ctx_len(p)) 493 return -EINVAL; 494 } 495 ext_hdrs[ext_type-1] = p; 496 } 497 p += ext_len; 498 len -= ext_len; 499 } 500 501 return 0; 502 } 503 504 static uint16_t 505 pfkey_satype2proto(uint8_t satype) 506 { 507 switch (satype) { 508 case SADB_SATYPE_UNSPEC: 509 return IPSEC_PROTO_ANY; 510 case SADB_SATYPE_AH: 511 return IPPROTO_AH; 512 case SADB_SATYPE_ESP: 513 return IPPROTO_ESP; 514 case SADB_X_SATYPE_IPCOMP: 515 return IPPROTO_COMP; 516 break; 517 default: 518 return 0; 519 } 520 /* NOTREACHED */ 521 } 522 523 static uint8_t 524 pfkey_proto2satype(uint16_t proto) 525 { 526 switch (proto) { 527 case IPPROTO_AH: 528 return SADB_SATYPE_AH; 529 case IPPROTO_ESP: 530 return SADB_SATYPE_ESP; 531 case IPPROTO_COMP: 532 return SADB_X_SATYPE_IPCOMP; 533 break; 534 default: 535 return 0; 536 } 537 /* NOTREACHED */ 538 } 539 540 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 541 * say specifically 'just raw sockets' as we encode them as 255. 542 */ 543 544 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 545 { 546 return (proto == IPSEC_PROTO_ANY ? 0 : proto); 547 } 548 549 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 550 { 551 return (proto ? proto : IPSEC_PROTO_ANY); 552 } 553 554 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, 555 xfrm_address_t *xaddr) 556 { 557 switch (((struct sockaddr*)(addr + 1))->sa_family) { 558 case AF_INET: 559 xaddr->a4 = 560 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; 561 return AF_INET; 562 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 563 case AF_INET6: 564 memcpy(xaddr->a6, 565 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, 566 sizeof(struct in6_addr)); 567 return AF_INET6; 568 #endif 569 default: 570 return 0; 571 } 572 /* NOTREACHED */ 573 } 574 575 static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) 576 { 577 struct sadb_sa *sa; 578 struct sadb_address *addr; 579 uint16_t proto; 580 unsigned short family; 581 xfrm_address_t *xaddr; 582 583 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 584 if (sa == NULL) 585 return NULL; 586 587 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 588 if (proto == 0) 589 return NULL; 590 591 /* sadb_address_len should be checked by caller */ 592 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 593 if (addr == NULL) 594 return NULL; 595 596 family = ((struct sockaddr *)(addr + 1))->sa_family; 597 switch (family) { 598 case AF_INET: 599 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; 600 break; 601 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 602 case AF_INET6: 603 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; 604 break; 605 #endif 606 default: 607 xaddr = NULL; 608 } 609 610 if (!xaddr) 611 return NULL; 612 613 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); 614 } 615 616 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 617 static int 618 pfkey_sockaddr_size(sa_family_t family) 619 { 620 switch (family) { 621 case AF_INET: 622 return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); 623 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 624 case AF_INET6: 625 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); 626 #endif 627 default: 628 return 0; 629 } 630 /* NOTREACHED */ 631 } 632 633 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) 634 { 635 struct sk_buff *skb; 636 struct sadb_msg *hdr; 637 struct sadb_sa *sa; 638 struct sadb_lifetime *lifetime; 639 struct sadb_address *addr; 640 struct sadb_key *key; 641 struct sadb_x_sa2 *sa2; 642 struct sockaddr_in *sin; 643 struct sadb_x_sec_ctx *sec_ctx; 644 struct xfrm_sec_ctx *xfrm_ctx; 645 int ctx_size = 0; 646 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 647 struct sockaddr_in6 *sin6; 648 #endif 649 int size; 650 int auth_key_size = 0; 651 int encrypt_key_size = 0; 652 int sockaddr_size; 653 struct xfrm_encap_tmpl *natt = NULL; 654 655 /* address family check */ 656 sockaddr_size = pfkey_sockaddr_size(x->props.family); 657 if (!sockaddr_size) 658 return ERR_PTR(-EINVAL); 659 660 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 661 key(AE), (identity(SD),) (sensitivity)> */ 662 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 663 sizeof(struct sadb_lifetime) + 664 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 665 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 666 sizeof(struct sadb_address)*2 + 667 sockaddr_size*2 + 668 sizeof(struct sadb_x_sa2); 669 670 if ((xfrm_ctx = x->security)) { 671 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 672 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 673 } 674 675 /* identity & sensitivity */ 676 677 if ((x->props.family == AF_INET && 678 x->sel.saddr.a4 != x->props.saddr.a4) 679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 680 || (x->props.family == AF_INET6 && 681 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) 682 #endif 683 ) 684 size += sizeof(struct sadb_address) + sockaddr_size; 685 686 if (add_keys) { 687 if (x->aalg && x->aalg->alg_key_len) { 688 auth_key_size = 689 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 690 size += sizeof(struct sadb_key) + auth_key_size; 691 } 692 if (x->ealg && x->ealg->alg_key_len) { 693 encrypt_key_size = 694 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 695 size += sizeof(struct sadb_key) + encrypt_key_size; 696 } 697 } 698 if (x->encap) 699 natt = x->encap; 700 701 if (natt && natt->encap_type) { 702 size += sizeof(struct sadb_x_nat_t_type); 703 size += sizeof(struct sadb_x_nat_t_port); 704 size += sizeof(struct sadb_x_nat_t_port); 705 } 706 707 skb = alloc_skb(size + 16, GFP_ATOMIC); 708 if (skb == NULL) 709 return ERR_PTR(-ENOBUFS); 710 711 /* call should fill header later */ 712 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 713 memset(hdr, 0, size); /* XXX do we need this ? */ 714 hdr->sadb_msg_len = size / sizeof(uint64_t); 715 716 /* sa */ 717 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 718 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 719 sa->sadb_sa_exttype = SADB_EXT_SA; 720 sa->sadb_sa_spi = x->id.spi; 721 sa->sadb_sa_replay = x->props.replay_window; 722 switch (x->km.state) { 723 case XFRM_STATE_VALID: 724 sa->sadb_sa_state = x->km.dying ? 725 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 726 break; 727 case XFRM_STATE_ACQ: 728 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 729 break; 730 default: 731 sa->sadb_sa_state = SADB_SASTATE_DEAD; 732 break; 733 } 734 sa->sadb_sa_auth = 0; 735 if (x->aalg) { 736 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 737 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; 738 } 739 sa->sadb_sa_encrypt = 0; 740 BUG_ON(x->ealg && x->calg); 741 if (x->ealg) { 742 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 743 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 744 } 745 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 746 if (x->calg) { 747 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 748 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 749 } 750 751 sa->sadb_sa_flags = 0; 752 if (x->props.flags & XFRM_STATE_NOECN) 753 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 754 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 755 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 756 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 757 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 758 759 /* hard time */ 760 if (hsc & 2) { 761 lifetime = (struct sadb_lifetime *) skb_put(skb, 762 sizeof(struct sadb_lifetime)); 763 lifetime->sadb_lifetime_len = 764 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 765 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 766 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 767 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 768 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 769 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 770 } 771 /* soft time */ 772 if (hsc & 1) { 773 lifetime = (struct sadb_lifetime *) skb_put(skb, 774 sizeof(struct sadb_lifetime)); 775 lifetime->sadb_lifetime_len = 776 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 777 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 778 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 779 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 780 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 781 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 782 } 783 /* current time */ 784 lifetime = (struct sadb_lifetime *) skb_put(skb, 785 sizeof(struct sadb_lifetime)); 786 lifetime->sadb_lifetime_len = 787 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 788 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 789 lifetime->sadb_lifetime_allocations = x->curlft.packets; 790 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 791 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 792 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 793 /* src address */ 794 addr = (struct sadb_address*) skb_put(skb, 795 sizeof(struct sadb_address)+sockaddr_size); 796 addr->sadb_address_len = 797 (sizeof(struct sadb_address)+sockaddr_size)/ 798 sizeof(uint64_t); 799 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 800 /* "if the ports are non-zero, then the sadb_address_proto field, 801 normally zero, MUST be filled in with the transport 802 protocol's number." - RFC2367 */ 803 addr->sadb_address_proto = 0; 804 addr->sadb_address_reserved = 0; 805 if (x->props.family == AF_INET) { 806 addr->sadb_address_prefixlen = 32; 807 808 sin = (struct sockaddr_in *) (addr + 1); 809 sin->sin_family = AF_INET; 810 sin->sin_addr.s_addr = x->props.saddr.a4; 811 sin->sin_port = 0; 812 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 813 } 814 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 815 else if (x->props.family == AF_INET6) { 816 addr->sadb_address_prefixlen = 128; 817 818 sin6 = (struct sockaddr_in6 *) (addr + 1); 819 sin6->sin6_family = AF_INET6; 820 sin6->sin6_port = 0; 821 sin6->sin6_flowinfo = 0; 822 memcpy(&sin6->sin6_addr, x->props.saddr.a6, 823 sizeof(struct in6_addr)); 824 sin6->sin6_scope_id = 0; 825 } 826 #endif 827 else 828 BUG(); 829 830 /* dst address */ 831 addr = (struct sadb_address*) skb_put(skb, 832 sizeof(struct sadb_address)+sockaddr_size); 833 addr->sadb_address_len = 834 (sizeof(struct sadb_address)+sockaddr_size)/ 835 sizeof(uint64_t); 836 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 837 addr->sadb_address_proto = 0; 838 addr->sadb_address_prefixlen = 32; /* XXX */ 839 addr->sadb_address_reserved = 0; 840 if (x->props.family == AF_INET) { 841 sin = (struct sockaddr_in *) (addr + 1); 842 sin->sin_family = AF_INET; 843 sin->sin_addr.s_addr = x->id.daddr.a4; 844 sin->sin_port = 0; 845 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 846 847 if (x->sel.saddr.a4 != x->props.saddr.a4) { 848 addr = (struct sadb_address*) skb_put(skb, 849 sizeof(struct sadb_address)+sockaddr_size); 850 addr->sadb_address_len = 851 (sizeof(struct sadb_address)+sockaddr_size)/ 852 sizeof(uint64_t); 853 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 854 addr->sadb_address_proto = 855 pfkey_proto_from_xfrm(x->sel.proto); 856 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 857 addr->sadb_address_reserved = 0; 858 859 sin = (struct sockaddr_in *) (addr + 1); 860 sin->sin_family = AF_INET; 861 sin->sin_addr.s_addr = x->sel.saddr.a4; 862 sin->sin_port = x->sel.sport; 863 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 864 } 865 } 866 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 867 else if (x->props.family == AF_INET6) { 868 addr->sadb_address_prefixlen = 128; 869 870 sin6 = (struct sockaddr_in6 *) (addr + 1); 871 sin6->sin6_family = AF_INET6; 872 sin6->sin6_port = 0; 873 sin6->sin6_flowinfo = 0; 874 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); 875 sin6->sin6_scope_id = 0; 876 877 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, 878 sizeof(struct in6_addr))) { 879 addr = (struct sadb_address *) skb_put(skb, 880 sizeof(struct sadb_address)+sockaddr_size); 881 addr->sadb_address_len = 882 (sizeof(struct sadb_address)+sockaddr_size)/ 883 sizeof(uint64_t); 884 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 885 addr->sadb_address_proto = 886 pfkey_proto_from_xfrm(x->sel.proto); 887 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 888 addr->sadb_address_reserved = 0; 889 890 sin6 = (struct sockaddr_in6 *) (addr + 1); 891 sin6->sin6_family = AF_INET6; 892 sin6->sin6_port = x->sel.sport; 893 sin6->sin6_flowinfo = 0; 894 memcpy(&sin6->sin6_addr, x->sel.saddr.a6, 895 sizeof(struct in6_addr)); 896 sin6->sin6_scope_id = 0; 897 } 898 } 899 #endif 900 else 901 BUG(); 902 903 /* auth key */ 904 if (add_keys && auth_key_size) { 905 key = (struct sadb_key *) skb_put(skb, 906 sizeof(struct sadb_key)+auth_key_size); 907 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 908 sizeof(uint64_t); 909 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 910 key->sadb_key_bits = x->aalg->alg_key_len; 911 key->sadb_key_reserved = 0; 912 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 913 } 914 /* encrypt key */ 915 if (add_keys && encrypt_key_size) { 916 key = (struct sadb_key *) skb_put(skb, 917 sizeof(struct sadb_key)+encrypt_key_size); 918 key->sadb_key_len = (sizeof(struct sadb_key) + 919 encrypt_key_size) / sizeof(uint64_t); 920 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 921 key->sadb_key_bits = x->ealg->alg_key_len; 922 key->sadb_key_reserved = 0; 923 memcpy(key + 1, x->ealg->alg_key, 924 (x->ealg->alg_key_len+7)/8); 925 } 926 927 /* sa */ 928 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 929 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 930 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 931 sa2->sadb_x_sa2_mode = x->props.mode + 1; 932 sa2->sadb_x_sa2_reserved1 = 0; 933 sa2->sadb_x_sa2_reserved2 = 0; 934 sa2->sadb_x_sa2_sequence = 0; 935 sa2->sadb_x_sa2_reqid = x->props.reqid; 936 937 if (natt && natt->encap_type) { 938 struct sadb_x_nat_t_type *n_type; 939 struct sadb_x_nat_t_port *n_port; 940 941 /* type */ 942 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 943 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 944 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 945 n_type->sadb_x_nat_t_type_type = natt->encap_type; 946 n_type->sadb_x_nat_t_type_reserved[0] = 0; 947 n_type->sadb_x_nat_t_type_reserved[1] = 0; 948 n_type->sadb_x_nat_t_type_reserved[2] = 0; 949 950 /* source port */ 951 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 952 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 953 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 954 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 955 n_port->sadb_x_nat_t_port_reserved = 0; 956 957 /* dest port */ 958 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 959 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 960 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 961 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 962 n_port->sadb_x_nat_t_port_reserved = 0; 963 } 964 965 /* security context */ 966 if (xfrm_ctx) { 967 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 968 sizeof(struct sadb_x_sec_ctx) + ctx_size); 969 sec_ctx->sadb_x_sec_len = 970 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 971 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 972 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 973 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 974 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 975 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 976 xfrm_ctx->ctx_len); 977 } 978 979 return skb; 980 } 981 982 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, 983 void **ext_hdrs) 984 { 985 struct xfrm_state *x; 986 struct sadb_lifetime *lifetime; 987 struct sadb_sa *sa; 988 struct sadb_key *key; 989 struct sadb_x_sec_ctx *sec_ctx; 990 uint16_t proto; 991 int err; 992 993 994 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 995 if (!sa || 996 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 997 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 998 return ERR_PTR(-EINVAL); 999 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1000 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1001 return ERR_PTR(-EINVAL); 1002 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1003 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1004 return ERR_PTR(-EINVAL); 1005 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1006 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1007 return ERR_PTR(-EINVAL); 1008 1009 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1010 if (proto == 0) 1011 return ERR_PTR(-EINVAL); 1012 1013 /* default error is no buffer space */ 1014 err = -ENOBUFS; 1015 1016 /* RFC2367: 1017 1018 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1019 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1020 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1021 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1022 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1023 not true. 1024 1025 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1026 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1027 */ 1028 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1029 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1030 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1031 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1032 return ERR_PTR(-EINVAL); 1033 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1034 if (key != NULL && 1035 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1036 ((key->sadb_key_bits+7) / 8 == 0 || 1037 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1038 return ERR_PTR(-EINVAL); 1039 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1040 if (key != NULL && 1041 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1042 ((key->sadb_key_bits+7) / 8 == 0 || 1043 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1044 return ERR_PTR(-EINVAL); 1045 1046 x = xfrm_state_alloc(); 1047 if (x == NULL) 1048 return ERR_PTR(-ENOBUFS); 1049 1050 x->id.proto = proto; 1051 x->id.spi = sa->sadb_sa_spi; 1052 x->props.replay_window = sa->sadb_sa_replay; 1053 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1054 x->props.flags |= XFRM_STATE_NOECN; 1055 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1056 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1057 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1058 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1059 1060 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; 1061 if (lifetime != NULL) { 1062 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1063 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1064 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1065 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1066 } 1067 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; 1068 if (lifetime != NULL) { 1069 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1070 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1071 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1072 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1073 } 1074 1075 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 1076 if (sec_ctx != NULL) { 1077 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1078 1079 if (!uctx) 1080 goto out; 1081 1082 err = security_xfrm_state_alloc(x, uctx); 1083 kfree(uctx); 1084 1085 if (err) 1086 goto out; 1087 } 1088 1089 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1090 if (sa->sadb_sa_auth) { 1091 int keysize = 0; 1092 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1093 if (!a) { 1094 err = -ENOSYS; 1095 goto out; 1096 } 1097 if (key) 1098 keysize = (key->sadb_key_bits + 7) / 8; 1099 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1100 if (!x->aalg) 1101 goto out; 1102 strcpy(x->aalg->alg_name, a->name); 1103 x->aalg->alg_key_len = 0; 1104 if (key) { 1105 x->aalg->alg_key_len = key->sadb_key_bits; 1106 memcpy(x->aalg->alg_key, key+1, keysize); 1107 } 1108 x->props.aalgo = sa->sadb_sa_auth; 1109 /* x->algo.flags = sa->sadb_sa_flags; */ 1110 } 1111 if (sa->sadb_sa_encrypt) { 1112 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1113 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1114 if (!a) { 1115 err = -ENOSYS; 1116 goto out; 1117 } 1118 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1119 if (!x->calg) 1120 goto out; 1121 strcpy(x->calg->alg_name, a->name); 1122 x->props.calgo = sa->sadb_sa_encrypt; 1123 } else { 1124 int keysize = 0; 1125 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1126 if (!a) { 1127 err = -ENOSYS; 1128 goto out; 1129 } 1130 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1131 if (key) 1132 keysize = (key->sadb_key_bits + 7) / 8; 1133 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1134 if (!x->ealg) 1135 goto out; 1136 strcpy(x->ealg->alg_name, a->name); 1137 x->ealg->alg_key_len = 0; 1138 if (key) { 1139 x->ealg->alg_key_len = key->sadb_key_bits; 1140 memcpy(x->ealg->alg_key, key+1, keysize); 1141 } 1142 x->props.ealgo = sa->sadb_sa_encrypt; 1143 } 1144 } 1145 /* x->algo.flags = sa->sadb_sa_flags; */ 1146 1147 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1148 &x->props.saddr); 1149 if (!x->props.family) { 1150 err = -EAFNOSUPPORT; 1151 goto out; 1152 } 1153 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1154 &x->id.daddr); 1155 1156 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1157 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1158 x->props.mode = sa2->sadb_x_sa2_mode; 1159 if (x->props.mode) 1160 x->props.mode--; 1161 x->props.reqid = sa2->sadb_x_sa2_reqid; 1162 } 1163 1164 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1165 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1166 1167 /* Nobody uses this, but we try. */ 1168 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1169 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1170 } 1171 1172 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1173 struct sadb_x_nat_t_type* n_type; 1174 struct xfrm_encap_tmpl *natt; 1175 1176 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1177 if (!x->encap) 1178 goto out; 1179 1180 natt = x->encap; 1181 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1182 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1183 1184 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1185 struct sadb_x_nat_t_port* n_port = 1186 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1187 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1188 } 1189 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1190 struct sadb_x_nat_t_port* n_port = 1191 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1192 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1193 } 1194 } 1195 1196 err = xfrm_init_state(x); 1197 if (err) 1198 goto out; 1199 1200 x->km.seq = hdr->sadb_msg_seq; 1201 return x; 1202 1203 out: 1204 x->km.state = XFRM_STATE_DEAD; 1205 xfrm_state_put(x); 1206 return ERR_PTR(err); 1207 } 1208 1209 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1210 { 1211 return -EOPNOTSUPP; 1212 } 1213 1214 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1215 { 1216 struct sk_buff *resp_skb; 1217 struct sadb_x_sa2 *sa2; 1218 struct sadb_address *saddr, *daddr; 1219 struct sadb_msg *out_hdr; 1220 struct xfrm_state *x = NULL; 1221 u8 mode; 1222 u32 reqid; 1223 u8 proto; 1224 unsigned short family; 1225 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1226 1227 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1228 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1229 return -EINVAL; 1230 1231 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1232 if (proto == 0) 1233 return -EINVAL; 1234 1235 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1236 mode = sa2->sadb_x_sa2_mode - 1; 1237 reqid = sa2->sadb_x_sa2_reqid; 1238 } else { 1239 mode = 0; 1240 reqid = 0; 1241 } 1242 1243 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1244 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1245 1246 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1247 switch (family) { 1248 case AF_INET: 1249 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1250 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1251 break; 1252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1253 case AF_INET6: 1254 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1255 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1256 break; 1257 #endif 1258 } 1259 1260 if (hdr->sadb_msg_seq) { 1261 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1262 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1263 xfrm_state_put(x); 1264 x = NULL; 1265 } 1266 } 1267 1268 if (!x) 1269 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); 1270 1271 if (x == NULL) 1272 return -ENOENT; 1273 1274 resp_skb = ERR_PTR(-ENOENT); 1275 1276 spin_lock_bh(&x->lock); 1277 if (x->km.state != XFRM_STATE_DEAD) { 1278 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1279 u32 min_spi, max_spi; 1280 1281 if (range != NULL) { 1282 min_spi = range->sadb_spirange_min; 1283 max_spi = range->sadb_spirange_max; 1284 } else { 1285 min_spi = 0x100; 1286 max_spi = 0x0fffffff; 1287 } 1288 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); 1289 if (x->id.spi) 1290 resp_skb = pfkey_xfrm_state2msg(x, 0, 3); 1291 } 1292 spin_unlock_bh(&x->lock); 1293 1294 if (IS_ERR(resp_skb)) { 1295 xfrm_state_put(x); 1296 return PTR_ERR(resp_skb); 1297 } 1298 1299 out_hdr = (struct sadb_msg *) resp_skb->data; 1300 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1301 out_hdr->sadb_msg_type = SADB_GETSPI; 1302 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1303 out_hdr->sadb_msg_errno = 0; 1304 out_hdr->sadb_msg_reserved = 0; 1305 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1306 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1307 1308 xfrm_state_put(x); 1309 1310 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); 1311 1312 return 0; 1313 } 1314 1315 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1316 { 1317 struct xfrm_state *x; 1318 1319 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1320 return -EOPNOTSUPP; 1321 1322 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1323 return 0; 1324 1325 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1326 if (x == NULL) 1327 return 0; 1328 1329 spin_lock_bh(&x->lock); 1330 if (x->km.state == XFRM_STATE_ACQ) { 1331 x->km.state = XFRM_STATE_ERROR; 1332 wake_up(&km_waitq); 1333 } 1334 spin_unlock_bh(&x->lock); 1335 xfrm_state_put(x); 1336 return 0; 1337 } 1338 1339 static inline int event2poltype(int event) 1340 { 1341 switch (event) { 1342 case XFRM_MSG_DELPOLICY: 1343 return SADB_X_SPDDELETE; 1344 case XFRM_MSG_NEWPOLICY: 1345 return SADB_X_SPDADD; 1346 case XFRM_MSG_UPDPOLICY: 1347 return SADB_X_SPDUPDATE; 1348 case XFRM_MSG_POLEXPIRE: 1349 // return SADB_X_SPDEXPIRE; 1350 default: 1351 printk("pfkey: Unknown policy event %d\n", event); 1352 break; 1353 } 1354 1355 return 0; 1356 } 1357 1358 static inline int event2keytype(int event) 1359 { 1360 switch (event) { 1361 case XFRM_MSG_DELSA: 1362 return SADB_DELETE; 1363 case XFRM_MSG_NEWSA: 1364 return SADB_ADD; 1365 case XFRM_MSG_UPDSA: 1366 return SADB_UPDATE; 1367 case XFRM_MSG_EXPIRE: 1368 return SADB_EXPIRE; 1369 default: 1370 printk("pfkey: Unknown SA event %d\n", event); 1371 break; 1372 } 1373 1374 return 0; 1375 } 1376 1377 /* ADD/UPD/DEL */ 1378 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1379 { 1380 struct sk_buff *skb; 1381 struct sadb_msg *hdr; 1382 int hsc = 3; 1383 1384 if (c->event == XFRM_MSG_DELSA) 1385 hsc = 0; 1386 1387 skb = pfkey_xfrm_state2msg(x, 0, hsc); 1388 1389 if (IS_ERR(skb)) 1390 return PTR_ERR(skb); 1391 1392 hdr = (struct sadb_msg *) skb->data; 1393 hdr->sadb_msg_version = PF_KEY_V2; 1394 hdr->sadb_msg_type = event2keytype(c->event); 1395 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1396 hdr->sadb_msg_errno = 0; 1397 hdr->sadb_msg_reserved = 0; 1398 hdr->sadb_msg_seq = c->seq; 1399 hdr->sadb_msg_pid = c->pid; 1400 1401 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1402 1403 return 0; 1404 } 1405 1406 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1407 { 1408 struct xfrm_state *x; 1409 int err; 1410 struct km_event c; 1411 1412 xfrm_probe_algs(); 1413 1414 x = pfkey_msg2xfrm_state(hdr, ext_hdrs); 1415 if (IS_ERR(x)) 1416 return PTR_ERR(x); 1417 1418 xfrm_state_hold(x); 1419 if (hdr->sadb_msg_type == SADB_ADD) 1420 err = xfrm_state_add(x); 1421 else 1422 err = xfrm_state_update(x); 1423 1424 if (err < 0) { 1425 x->km.state = XFRM_STATE_DEAD; 1426 __xfrm_state_put(x); 1427 goto out; 1428 } 1429 1430 if (hdr->sadb_msg_type == SADB_ADD) 1431 c.event = XFRM_MSG_NEWSA; 1432 else 1433 c.event = XFRM_MSG_UPDSA; 1434 c.seq = hdr->sadb_msg_seq; 1435 c.pid = hdr->sadb_msg_pid; 1436 km_state_notify(x, &c); 1437 out: 1438 xfrm_state_put(x); 1439 return err; 1440 } 1441 1442 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1443 { 1444 struct xfrm_state *x; 1445 struct km_event c; 1446 int err; 1447 1448 if (!ext_hdrs[SADB_EXT_SA-1] || 1449 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1450 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1451 return -EINVAL; 1452 1453 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1454 if (x == NULL) 1455 return -ESRCH; 1456 1457 if (xfrm_state_kern(x)) { 1458 xfrm_state_put(x); 1459 return -EPERM; 1460 } 1461 1462 err = xfrm_state_delete(x); 1463 if (err < 0) { 1464 xfrm_state_put(x); 1465 return err; 1466 } 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 xfrm_state_put(x); 1473 1474 return err; 1475 } 1476 1477 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1478 { 1479 __u8 proto; 1480 struct sk_buff *out_skb; 1481 struct sadb_msg *out_hdr; 1482 struct xfrm_state *x; 1483 1484 if (!ext_hdrs[SADB_EXT_SA-1] || 1485 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1486 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1487 return -EINVAL; 1488 1489 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1490 if (x == NULL) 1491 return -ESRCH; 1492 1493 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1494 proto = x->id.proto; 1495 xfrm_state_put(x); 1496 if (IS_ERR(out_skb)) 1497 return PTR_ERR(out_skb); 1498 1499 out_hdr = (struct sadb_msg *) out_skb->data; 1500 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1501 out_hdr->sadb_msg_type = SADB_DUMP; 1502 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1503 out_hdr->sadb_msg_errno = 0; 1504 out_hdr->sadb_msg_reserved = 0; 1505 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1506 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1507 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 1508 1509 return 0; 1510 } 1511 1512 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1513 gfp_t allocation) 1514 { 1515 struct sk_buff *skb; 1516 struct sadb_msg *hdr; 1517 int len, auth_len, enc_len, i; 1518 1519 auth_len = xfrm_count_auth_supported(); 1520 if (auth_len) { 1521 auth_len *= sizeof(struct sadb_alg); 1522 auth_len += sizeof(struct sadb_supported); 1523 } 1524 1525 enc_len = xfrm_count_enc_supported(); 1526 if (enc_len) { 1527 enc_len *= sizeof(struct sadb_alg); 1528 enc_len += sizeof(struct sadb_supported); 1529 } 1530 1531 len = enc_len + auth_len + sizeof(struct sadb_msg); 1532 1533 skb = alloc_skb(len + 16, allocation); 1534 if (!skb) 1535 goto out_put_algs; 1536 1537 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1538 pfkey_hdr_dup(hdr, orig); 1539 hdr->sadb_msg_errno = 0; 1540 hdr->sadb_msg_len = len / sizeof(uint64_t); 1541 1542 if (auth_len) { 1543 struct sadb_supported *sp; 1544 struct sadb_alg *ap; 1545 1546 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1547 ap = (struct sadb_alg *) (sp + 1); 1548 1549 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1550 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1551 1552 for (i = 0; ; i++) { 1553 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1554 if (!aalg) 1555 break; 1556 if (aalg->available) 1557 *ap++ = aalg->desc; 1558 } 1559 } 1560 1561 if (enc_len) { 1562 struct sadb_supported *sp; 1563 struct sadb_alg *ap; 1564 1565 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1566 ap = (struct sadb_alg *) (sp + 1); 1567 1568 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1569 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1570 1571 for (i = 0; ; i++) { 1572 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1573 if (!ealg) 1574 break; 1575 if (ealg->available) 1576 *ap++ = ealg->desc; 1577 } 1578 } 1579 1580 out_put_algs: 1581 return skb; 1582 } 1583 1584 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1585 { 1586 struct pfkey_sock *pfk = pfkey_sk(sk); 1587 struct sk_buff *supp_skb; 1588 1589 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1590 return -EINVAL; 1591 1592 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1593 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1594 return -EEXIST; 1595 pfk->registered |= (1<<hdr->sadb_msg_satype); 1596 } 1597 1598 xfrm_probe_algs(); 1599 1600 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1601 if (!supp_skb) { 1602 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1603 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1604 1605 return -ENOBUFS; 1606 } 1607 1608 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); 1609 1610 return 0; 1611 } 1612 1613 static int key_notify_sa_flush(struct km_event *c) 1614 { 1615 struct sk_buff *skb; 1616 struct sadb_msg *hdr; 1617 1618 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1619 if (!skb) 1620 return -ENOBUFS; 1621 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1622 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1623 hdr->sadb_msg_type = SADB_FLUSH; 1624 hdr->sadb_msg_seq = c->seq; 1625 hdr->sadb_msg_pid = c->pid; 1626 hdr->sadb_msg_version = PF_KEY_V2; 1627 hdr->sadb_msg_errno = (uint8_t) 0; 1628 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1629 1630 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1631 1632 return 0; 1633 } 1634 1635 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1636 { 1637 unsigned proto; 1638 struct km_event c; 1639 1640 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1641 if (proto == 0) 1642 return -EINVAL; 1643 1644 xfrm_state_flush(proto); 1645 c.data.proto = proto; 1646 c.seq = hdr->sadb_msg_seq; 1647 c.pid = hdr->sadb_msg_pid; 1648 c.event = XFRM_MSG_FLUSHSA; 1649 km_state_notify(NULL, &c); 1650 1651 return 0; 1652 } 1653 1654 struct pfkey_dump_data 1655 { 1656 struct sk_buff *skb; 1657 struct sadb_msg *hdr; 1658 struct sock *sk; 1659 }; 1660 1661 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1662 { 1663 struct pfkey_dump_data *data = ptr; 1664 struct sk_buff *out_skb; 1665 struct sadb_msg *out_hdr; 1666 1667 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1668 if (IS_ERR(out_skb)) 1669 return PTR_ERR(out_skb); 1670 1671 out_hdr = (struct sadb_msg *) out_skb->data; 1672 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 1673 out_hdr->sadb_msg_type = SADB_DUMP; 1674 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1675 out_hdr->sadb_msg_errno = 0; 1676 out_hdr->sadb_msg_reserved = 0; 1677 out_hdr->sadb_msg_seq = count; 1678 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 1679 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 1680 return 0; 1681 } 1682 1683 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1684 { 1685 u8 proto; 1686 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 1687 1688 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1689 if (proto == 0) 1690 return -EINVAL; 1691 1692 return xfrm_state_walk(proto, dump_sa, &data); 1693 } 1694 1695 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1696 { 1697 struct pfkey_sock *pfk = pfkey_sk(sk); 1698 int satype = hdr->sadb_msg_satype; 1699 1700 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1701 /* XXX we mangle packet... */ 1702 hdr->sadb_msg_errno = 0; 1703 if (satype != 0 && satype != 1) 1704 return -EINVAL; 1705 pfk->promisc = satype; 1706 } 1707 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); 1708 return 0; 1709 } 1710 1711 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1712 { 1713 int i; 1714 u32 reqid = *(u32*)ptr; 1715 1716 for (i=0; i<xp->xfrm_nr; i++) { 1717 if (xp->xfrm_vec[i].reqid == reqid) 1718 return -EEXIST; 1719 } 1720 return 0; 1721 } 1722 1723 static u32 gen_reqid(void) 1724 { 1725 u32 start; 1726 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1727 1728 start = reqid; 1729 do { 1730 ++reqid; 1731 if (reqid == 0) 1732 reqid = IPSEC_MANUAL_REQID_MAX+1; 1733 if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST) 1734 return reqid; 1735 } while (reqid != start); 1736 return 0; 1737 } 1738 1739 static int 1740 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1741 { 1742 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1743 struct sockaddr_in *sin; 1744 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1745 struct sockaddr_in6 *sin6; 1746 #endif 1747 1748 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1749 return -ELOOP; 1750 1751 if (rq->sadb_x_ipsecrequest_mode == 0) 1752 return -EINVAL; 1753 1754 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1755 t->mode = rq->sadb_x_ipsecrequest_mode-1; 1756 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1757 t->optional = 1; 1758 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1759 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1760 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1761 t->reqid = 0; 1762 if (!t->reqid && !(t->reqid = gen_reqid())) 1763 return -ENOBUFS; 1764 } 1765 1766 /* addresses present only in tunnel mode */ 1767 if (t->mode) { 1768 switch (xp->family) { 1769 case AF_INET: 1770 sin = (void*)(rq+1); 1771 if (sin->sin_family != AF_INET) 1772 return -EINVAL; 1773 t->saddr.a4 = sin->sin_addr.s_addr; 1774 sin++; 1775 if (sin->sin_family != AF_INET) 1776 return -EINVAL; 1777 t->id.daddr.a4 = sin->sin_addr.s_addr; 1778 break; 1779 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1780 case AF_INET6: 1781 sin6 = (void *)(rq+1); 1782 if (sin6->sin6_family != AF_INET6) 1783 return -EINVAL; 1784 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1785 sin6++; 1786 if (sin6->sin6_family != AF_INET6) 1787 return -EINVAL; 1788 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1789 break; 1790 #endif 1791 default: 1792 return -EINVAL; 1793 } 1794 } 1795 /* No way to set this via kame pfkey */ 1796 t->aalgos = t->ealgos = t->calgos = ~0; 1797 xp->xfrm_nr++; 1798 return 0; 1799 } 1800 1801 static int 1802 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1803 { 1804 int err; 1805 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1806 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1807 1808 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1809 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1810 return err; 1811 len -= rq->sadb_x_ipsecrequest_len; 1812 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1813 } 1814 return 0; 1815 } 1816 1817 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1818 { 1819 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1820 1821 if (xfrm_ctx) { 1822 int len = sizeof(struct sadb_x_sec_ctx); 1823 len += xfrm_ctx->ctx_len; 1824 return PFKEY_ALIGN8(len); 1825 } 1826 return 0; 1827 } 1828 1829 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1830 { 1831 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1832 int socklen = (xp->family == AF_INET ? 1833 sizeof(struct sockaddr_in) : 1834 sizeof(struct sockaddr_in6)); 1835 1836 return sizeof(struct sadb_msg) + 1837 (sizeof(struct sadb_lifetime) * 3) + 1838 (sizeof(struct sadb_address) * 2) + 1839 (sockaddr_size * 2) + 1840 sizeof(struct sadb_x_policy) + 1841 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) + 1842 (socklen * 2))) + 1843 pfkey_xfrm_policy2sec_ctx_size(xp); 1844 } 1845 1846 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1847 { 1848 struct sk_buff *skb; 1849 int size; 1850 1851 size = pfkey_xfrm_policy2msg_size(xp); 1852 1853 skb = alloc_skb(size + 16, GFP_ATOMIC); 1854 if (skb == NULL) 1855 return ERR_PTR(-ENOBUFS); 1856 1857 return skb; 1858 } 1859 1860 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1861 { 1862 struct sadb_msg *hdr; 1863 struct sadb_address *addr; 1864 struct sadb_lifetime *lifetime; 1865 struct sadb_x_policy *pol; 1866 struct sockaddr_in *sin; 1867 struct sadb_x_sec_ctx *sec_ctx; 1868 struct xfrm_sec_ctx *xfrm_ctx; 1869 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1870 struct sockaddr_in6 *sin6; 1871 #endif 1872 int i; 1873 int size; 1874 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1875 int socklen = (xp->family == AF_INET ? 1876 sizeof(struct sockaddr_in) : 1877 sizeof(struct sockaddr_in6)); 1878 1879 size = pfkey_xfrm_policy2msg_size(xp); 1880 1881 /* call should fill header later */ 1882 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1883 memset(hdr, 0, size); /* XXX do we need this ? */ 1884 1885 /* src address */ 1886 addr = (struct sadb_address*) skb_put(skb, 1887 sizeof(struct sadb_address)+sockaddr_size); 1888 addr->sadb_address_len = 1889 (sizeof(struct sadb_address)+sockaddr_size)/ 1890 sizeof(uint64_t); 1891 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 1892 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1893 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 1894 addr->sadb_address_reserved = 0; 1895 /* src address */ 1896 if (xp->family == AF_INET) { 1897 sin = (struct sockaddr_in *) (addr + 1); 1898 sin->sin_family = AF_INET; 1899 sin->sin_addr.s_addr = xp->selector.saddr.a4; 1900 sin->sin_port = xp->selector.sport; 1901 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1902 } 1903 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1904 else if (xp->family == AF_INET6) { 1905 sin6 = (struct sockaddr_in6 *) (addr + 1); 1906 sin6->sin6_family = AF_INET6; 1907 sin6->sin6_port = xp->selector.sport; 1908 sin6->sin6_flowinfo = 0; 1909 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, 1910 sizeof(struct in6_addr)); 1911 sin6->sin6_scope_id = 0; 1912 } 1913 #endif 1914 else 1915 BUG(); 1916 1917 /* dst address */ 1918 addr = (struct sadb_address*) skb_put(skb, 1919 sizeof(struct sadb_address)+sockaddr_size); 1920 addr->sadb_address_len = 1921 (sizeof(struct sadb_address)+sockaddr_size)/ 1922 sizeof(uint64_t); 1923 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 1924 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1925 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 1926 addr->sadb_address_reserved = 0; 1927 if (xp->family == AF_INET) { 1928 sin = (struct sockaddr_in *) (addr + 1); 1929 sin->sin_family = AF_INET; 1930 sin->sin_addr.s_addr = xp->selector.daddr.a4; 1931 sin->sin_port = xp->selector.dport; 1932 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1933 } 1934 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1935 else if (xp->family == AF_INET6) { 1936 sin6 = (struct sockaddr_in6 *) (addr + 1); 1937 sin6->sin6_family = AF_INET6; 1938 sin6->sin6_port = xp->selector.dport; 1939 sin6->sin6_flowinfo = 0; 1940 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, 1941 sizeof(struct in6_addr)); 1942 sin6->sin6_scope_id = 0; 1943 } 1944 #endif 1945 else 1946 BUG(); 1947 1948 /* hard time */ 1949 lifetime = (struct sadb_lifetime *) skb_put(skb, 1950 sizeof(struct sadb_lifetime)); 1951 lifetime->sadb_lifetime_len = 1952 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1953 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 1954 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 1955 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 1956 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 1957 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 1958 /* soft time */ 1959 lifetime = (struct sadb_lifetime *) skb_put(skb, 1960 sizeof(struct sadb_lifetime)); 1961 lifetime->sadb_lifetime_len = 1962 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1963 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 1964 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 1965 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 1966 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 1967 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 1968 /* current time */ 1969 lifetime = (struct sadb_lifetime *) skb_put(skb, 1970 sizeof(struct sadb_lifetime)); 1971 lifetime->sadb_lifetime_len = 1972 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1973 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 1974 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 1975 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 1976 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 1977 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 1978 1979 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 1980 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 1981 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1982 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 1983 if (xp->action == XFRM_POLICY_ALLOW) { 1984 if (xp->xfrm_nr) 1985 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 1986 else 1987 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 1988 } 1989 pol->sadb_x_policy_dir = dir+1; 1990 pol->sadb_x_policy_id = xp->index; 1991 pol->sadb_x_policy_priority = xp->priority; 1992 1993 for (i=0; i<xp->xfrm_nr; i++) { 1994 struct sadb_x_ipsecrequest *rq; 1995 struct xfrm_tmpl *t = xp->xfrm_vec + i; 1996 int req_size; 1997 1998 req_size = sizeof(struct sadb_x_ipsecrequest); 1999 if (t->mode) 2000 req_size += 2*socklen; 2001 else 2002 size -= 2*socklen; 2003 rq = (void*)skb_put(skb, req_size); 2004 pol->sadb_x_policy_len += req_size/8; 2005 memset(rq, 0, sizeof(*rq)); 2006 rq->sadb_x_ipsecrequest_len = req_size; 2007 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2008 rq->sadb_x_ipsecrequest_mode = t->mode+1; 2009 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2010 if (t->reqid) 2011 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2012 if (t->optional) 2013 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2014 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2015 if (t->mode) { 2016 switch (xp->family) { 2017 case AF_INET: 2018 sin = (void*)(rq+1); 2019 sin->sin_family = AF_INET; 2020 sin->sin_addr.s_addr = t->saddr.a4; 2021 sin->sin_port = 0; 2022 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2023 sin++; 2024 sin->sin_family = AF_INET; 2025 sin->sin_addr.s_addr = t->id.daddr.a4; 2026 sin->sin_port = 0; 2027 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2028 break; 2029 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2030 case AF_INET6: 2031 sin6 = (void*)(rq+1); 2032 sin6->sin6_family = AF_INET6; 2033 sin6->sin6_port = 0; 2034 sin6->sin6_flowinfo = 0; 2035 memcpy(&sin6->sin6_addr, t->saddr.a6, 2036 sizeof(struct in6_addr)); 2037 sin6->sin6_scope_id = 0; 2038 2039 sin6++; 2040 sin6->sin6_family = AF_INET6; 2041 sin6->sin6_port = 0; 2042 sin6->sin6_flowinfo = 0; 2043 memcpy(&sin6->sin6_addr, t->id.daddr.a6, 2044 sizeof(struct in6_addr)); 2045 sin6->sin6_scope_id = 0; 2046 break; 2047 #endif 2048 default: 2049 break; 2050 } 2051 } 2052 } 2053 2054 /* security context */ 2055 if ((xfrm_ctx = xp->security)) { 2056 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2057 2058 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2059 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2060 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2061 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2062 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2063 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2064 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2065 xfrm_ctx->ctx_len); 2066 } 2067 2068 hdr->sadb_msg_len = size / sizeof(uint64_t); 2069 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2070 } 2071 2072 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2073 { 2074 struct sk_buff *out_skb; 2075 struct sadb_msg *out_hdr; 2076 int err; 2077 2078 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2079 if (IS_ERR(out_skb)) { 2080 err = PTR_ERR(out_skb); 2081 goto out; 2082 } 2083 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2084 2085 out_hdr = (struct sadb_msg *) out_skb->data; 2086 out_hdr->sadb_msg_version = PF_KEY_V2; 2087 2088 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2089 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2090 else 2091 out_hdr->sadb_msg_type = event2poltype(c->event); 2092 out_hdr->sadb_msg_errno = 0; 2093 out_hdr->sadb_msg_seq = c->seq; 2094 out_hdr->sadb_msg_pid = c->pid; 2095 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 2096 out: 2097 return 0; 2098 2099 } 2100 2101 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2102 { 2103 int err = 0; 2104 struct sadb_lifetime *lifetime; 2105 struct sadb_address *sa; 2106 struct sadb_x_policy *pol; 2107 struct xfrm_policy *xp; 2108 struct km_event c; 2109 struct sadb_x_sec_ctx *sec_ctx; 2110 2111 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2112 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2113 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2114 return -EINVAL; 2115 2116 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2117 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2118 return -EINVAL; 2119 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2120 return -EINVAL; 2121 2122 xp = xfrm_policy_alloc(GFP_KERNEL); 2123 if (xp == NULL) 2124 return -ENOBUFS; 2125 2126 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2127 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2128 xp->priority = pol->sadb_x_policy_priority; 2129 2130 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2131 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2132 if (!xp->family) { 2133 err = -EINVAL; 2134 goto out; 2135 } 2136 xp->selector.family = xp->family; 2137 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2138 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2139 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2140 if (xp->selector.sport) 2141 xp->selector.sport_mask = ~0; 2142 2143 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2144 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2145 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2146 2147 /* Amusing, we set this twice. KAME apps appear to set same value 2148 * in both addresses. 2149 */ 2150 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2151 2152 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2153 if (xp->selector.dport) 2154 xp->selector.dport_mask = ~0; 2155 2156 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2157 if (sec_ctx != NULL) { 2158 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2159 2160 if (!uctx) { 2161 err = -ENOBUFS; 2162 goto out; 2163 } 2164 2165 err = security_xfrm_policy_alloc(xp, uctx); 2166 kfree(uctx); 2167 2168 if (err) 2169 goto out; 2170 } 2171 2172 xp->lft.soft_byte_limit = XFRM_INF; 2173 xp->lft.hard_byte_limit = XFRM_INF; 2174 xp->lft.soft_packet_limit = XFRM_INF; 2175 xp->lft.hard_packet_limit = XFRM_INF; 2176 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2177 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2178 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2179 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2180 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2181 } 2182 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2183 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2184 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2185 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2186 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2187 } 2188 xp->xfrm_nr = 0; 2189 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2190 (err = parse_ipsecrequests(xp, pol)) < 0) 2191 goto out; 2192 2193 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2194 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2195 2196 if (err) 2197 goto out; 2198 2199 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2200 c.event = XFRM_MSG_UPDPOLICY; 2201 else 2202 c.event = XFRM_MSG_NEWPOLICY; 2203 2204 c.seq = hdr->sadb_msg_seq; 2205 c.pid = hdr->sadb_msg_pid; 2206 2207 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2208 xfrm_pol_put(xp); 2209 return 0; 2210 2211 out: 2212 security_xfrm_policy_free(xp); 2213 kfree(xp); 2214 return err; 2215 } 2216 2217 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2218 { 2219 int err; 2220 struct sadb_address *sa; 2221 struct sadb_x_policy *pol; 2222 struct xfrm_policy *xp, tmp; 2223 struct xfrm_selector sel; 2224 struct km_event c; 2225 struct sadb_x_sec_ctx *sec_ctx; 2226 2227 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2228 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2229 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2230 return -EINVAL; 2231 2232 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2233 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2234 return -EINVAL; 2235 2236 memset(&sel, 0, sizeof(sel)); 2237 2238 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2239 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2240 sel.prefixlen_s = sa->sadb_address_prefixlen; 2241 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2242 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2243 if (sel.sport) 2244 sel.sport_mask = ~0; 2245 2246 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2247 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2248 sel.prefixlen_d = sa->sadb_address_prefixlen; 2249 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2250 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2251 if (sel.dport) 2252 sel.dport_mask = ~0; 2253 2254 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2255 memset(&tmp, 0, sizeof(struct xfrm_policy)); 2256 2257 if (sec_ctx != NULL) { 2258 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2259 2260 if (!uctx) 2261 return -ENOMEM; 2262 2263 err = security_xfrm_policy_alloc(&tmp, uctx); 2264 kfree(uctx); 2265 2266 if (err) 2267 return err; 2268 } 2269 2270 xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1); 2271 security_xfrm_policy_free(&tmp); 2272 if (xp == NULL) 2273 return -ENOENT; 2274 2275 err = 0; 2276 2277 c.seq = hdr->sadb_msg_seq; 2278 c.pid = hdr->sadb_msg_pid; 2279 c.event = XFRM_MSG_DELPOLICY; 2280 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2281 2282 xfrm_pol_put(xp); 2283 return err; 2284 } 2285 2286 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2287 { 2288 int err; 2289 struct sk_buff *out_skb; 2290 struct sadb_msg *out_hdr; 2291 err = 0; 2292 2293 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2294 if (IS_ERR(out_skb)) { 2295 err = PTR_ERR(out_skb); 2296 goto out; 2297 } 2298 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2299 2300 out_hdr = (struct sadb_msg *) out_skb->data; 2301 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2302 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2303 out_hdr->sadb_msg_satype = 0; 2304 out_hdr->sadb_msg_errno = 0; 2305 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2306 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2307 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 2308 err = 0; 2309 2310 out: 2311 return err; 2312 } 2313 2314 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2315 { 2316 unsigned int dir; 2317 int err; 2318 struct sadb_x_policy *pol; 2319 struct xfrm_policy *xp; 2320 struct km_event c; 2321 2322 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2323 return -EINVAL; 2324 2325 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2326 if (dir >= XFRM_POLICY_MAX) 2327 return -EINVAL; 2328 2329 xp = xfrm_policy_byid(dir, pol->sadb_x_policy_id, 2330 hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2331 if (xp == NULL) 2332 return -ENOENT; 2333 2334 err = 0; 2335 2336 c.seq = hdr->sadb_msg_seq; 2337 c.pid = hdr->sadb_msg_pid; 2338 if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) { 2339 c.data.byid = 1; 2340 c.event = XFRM_MSG_DELPOLICY; 2341 km_policy_notify(xp, dir, &c); 2342 } else { 2343 err = key_pol_get_resp(sk, xp, hdr, dir); 2344 } 2345 2346 xfrm_pol_put(xp); 2347 return err; 2348 } 2349 2350 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2351 { 2352 struct pfkey_dump_data *data = ptr; 2353 struct sk_buff *out_skb; 2354 struct sadb_msg *out_hdr; 2355 2356 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2357 if (IS_ERR(out_skb)) 2358 return PTR_ERR(out_skb); 2359 2360 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2361 2362 out_hdr = (struct sadb_msg *) out_skb->data; 2363 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 2364 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2365 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2366 out_hdr->sadb_msg_errno = 0; 2367 out_hdr->sadb_msg_seq = count; 2368 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 2369 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 2370 return 0; 2371 } 2372 2373 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2374 { 2375 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 2376 2377 return xfrm_policy_walk(dump_sp, &data); 2378 } 2379 2380 static int key_notify_policy_flush(struct km_event *c) 2381 { 2382 struct sk_buff *skb_out; 2383 struct sadb_msg *hdr; 2384 2385 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2386 if (!skb_out) 2387 return -ENOBUFS; 2388 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2389 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2390 hdr->sadb_msg_seq = c->seq; 2391 hdr->sadb_msg_pid = c->pid; 2392 hdr->sadb_msg_version = PF_KEY_V2; 2393 hdr->sadb_msg_errno = (uint8_t) 0; 2394 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2395 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL); 2396 return 0; 2397 2398 } 2399 2400 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2401 { 2402 struct km_event c; 2403 2404 xfrm_policy_flush(); 2405 c.event = XFRM_MSG_FLUSHPOLICY; 2406 c.pid = hdr->sadb_msg_pid; 2407 c.seq = hdr->sadb_msg_seq; 2408 km_policy_notify(NULL, 0, &c); 2409 2410 return 0; 2411 } 2412 2413 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2414 struct sadb_msg *hdr, void **ext_hdrs); 2415 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2416 [SADB_RESERVED] = pfkey_reserved, 2417 [SADB_GETSPI] = pfkey_getspi, 2418 [SADB_UPDATE] = pfkey_add, 2419 [SADB_ADD] = pfkey_add, 2420 [SADB_DELETE] = pfkey_delete, 2421 [SADB_GET] = pfkey_get, 2422 [SADB_ACQUIRE] = pfkey_acquire, 2423 [SADB_REGISTER] = pfkey_register, 2424 [SADB_EXPIRE] = NULL, 2425 [SADB_FLUSH] = pfkey_flush, 2426 [SADB_DUMP] = pfkey_dump, 2427 [SADB_X_PROMISC] = pfkey_promisc, 2428 [SADB_X_PCHANGE] = NULL, 2429 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2430 [SADB_X_SPDADD] = pfkey_spdadd, 2431 [SADB_X_SPDDELETE] = pfkey_spddelete, 2432 [SADB_X_SPDGET] = pfkey_spdget, 2433 [SADB_X_SPDACQUIRE] = NULL, 2434 [SADB_X_SPDDUMP] = pfkey_spddump, 2435 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2436 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2437 [SADB_X_SPDDELETE2] = pfkey_spdget, 2438 }; 2439 2440 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2441 { 2442 void *ext_hdrs[SADB_EXT_MAX]; 2443 int err; 2444 2445 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2446 BROADCAST_PROMISC_ONLY, NULL); 2447 2448 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2449 err = parse_exthdrs(skb, hdr, ext_hdrs); 2450 if (!err) { 2451 err = -EOPNOTSUPP; 2452 if (pfkey_funcs[hdr->sadb_msg_type]) 2453 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2454 } 2455 return err; 2456 } 2457 2458 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2459 { 2460 struct sadb_msg *hdr = NULL; 2461 2462 if (skb->len < sizeof(*hdr)) { 2463 *errp = -EMSGSIZE; 2464 } else { 2465 hdr = (struct sadb_msg *) skb->data; 2466 if (hdr->sadb_msg_version != PF_KEY_V2 || 2467 hdr->sadb_msg_reserved != 0 || 2468 (hdr->sadb_msg_type <= SADB_RESERVED || 2469 hdr->sadb_msg_type > SADB_MAX)) { 2470 hdr = NULL; 2471 *errp = -EINVAL; 2472 } else if (hdr->sadb_msg_len != (skb->len / 2473 sizeof(uint64_t)) || 2474 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2475 sizeof(uint64_t))) { 2476 hdr = NULL; 2477 *errp = -EMSGSIZE; 2478 } else { 2479 *errp = 0; 2480 } 2481 } 2482 return hdr; 2483 } 2484 2485 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2486 { 2487 return t->aalgos & (1 << d->desc.sadb_alg_id); 2488 } 2489 2490 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2491 { 2492 return t->ealgos & (1 << d->desc.sadb_alg_id); 2493 } 2494 2495 static int count_ah_combs(struct xfrm_tmpl *t) 2496 { 2497 int i, sz = 0; 2498 2499 for (i = 0; ; i++) { 2500 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2501 if (!aalg) 2502 break; 2503 if (aalg_tmpl_set(t, aalg) && aalg->available) 2504 sz += sizeof(struct sadb_comb); 2505 } 2506 return sz + sizeof(struct sadb_prop); 2507 } 2508 2509 static int count_esp_combs(struct xfrm_tmpl *t) 2510 { 2511 int i, k, sz = 0; 2512 2513 for (i = 0; ; i++) { 2514 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2515 if (!ealg) 2516 break; 2517 2518 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2519 continue; 2520 2521 for (k = 1; ; k++) { 2522 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2523 if (!aalg) 2524 break; 2525 2526 if (aalg_tmpl_set(t, aalg) && aalg->available) 2527 sz += sizeof(struct sadb_comb); 2528 } 2529 } 2530 return sz + sizeof(struct sadb_prop); 2531 } 2532 2533 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2534 { 2535 struct sadb_prop *p; 2536 int i; 2537 2538 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2539 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2540 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2541 p->sadb_prop_replay = 32; 2542 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2543 2544 for (i = 0; ; i++) { 2545 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2546 if (!aalg) 2547 break; 2548 2549 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2550 struct sadb_comb *c; 2551 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2552 memset(c, 0, sizeof(*c)); 2553 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2554 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2555 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2556 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2557 c->sadb_comb_hard_addtime = 24*60*60; 2558 c->sadb_comb_soft_addtime = 20*60*60; 2559 c->sadb_comb_hard_usetime = 8*60*60; 2560 c->sadb_comb_soft_usetime = 7*60*60; 2561 } 2562 } 2563 } 2564 2565 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2566 { 2567 struct sadb_prop *p; 2568 int i, k; 2569 2570 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2571 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2572 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2573 p->sadb_prop_replay = 32; 2574 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2575 2576 for (i=0; ; i++) { 2577 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2578 if (!ealg) 2579 break; 2580 2581 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2582 continue; 2583 2584 for (k = 1; ; k++) { 2585 struct sadb_comb *c; 2586 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2587 if (!aalg) 2588 break; 2589 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2590 continue; 2591 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2592 memset(c, 0, sizeof(*c)); 2593 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2594 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2595 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2596 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2597 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2598 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2599 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2600 c->sadb_comb_hard_addtime = 24*60*60; 2601 c->sadb_comb_soft_addtime = 20*60*60; 2602 c->sadb_comb_hard_usetime = 8*60*60; 2603 c->sadb_comb_soft_usetime = 7*60*60; 2604 } 2605 } 2606 } 2607 2608 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2609 { 2610 return 0; 2611 } 2612 2613 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2614 { 2615 struct sk_buff *out_skb; 2616 struct sadb_msg *out_hdr; 2617 int hard; 2618 int hsc; 2619 2620 hard = c->data.hard; 2621 if (hard) 2622 hsc = 2; 2623 else 2624 hsc = 1; 2625 2626 out_skb = pfkey_xfrm_state2msg(x, 0, hsc); 2627 if (IS_ERR(out_skb)) 2628 return PTR_ERR(out_skb); 2629 2630 out_hdr = (struct sadb_msg *) out_skb->data; 2631 out_hdr->sadb_msg_version = PF_KEY_V2; 2632 out_hdr->sadb_msg_type = SADB_EXPIRE; 2633 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2634 out_hdr->sadb_msg_errno = 0; 2635 out_hdr->sadb_msg_reserved = 0; 2636 out_hdr->sadb_msg_seq = 0; 2637 out_hdr->sadb_msg_pid = 0; 2638 2639 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2640 return 0; 2641 } 2642 2643 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2644 { 2645 switch (c->event) { 2646 case XFRM_MSG_EXPIRE: 2647 return key_notify_sa_expire(x, c); 2648 case XFRM_MSG_DELSA: 2649 case XFRM_MSG_NEWSA: 2650 case XFRM_MSG_UPDSA: 2651 return key_notify_sa(x, c); 2652 case XFRM_MSG_FLUSHSA: 2653 return key_notify_sa_flush(c); 2654 case XFRM_MSG_NEWAE: /* not yet supported */ 2655 break; 2656 default: 2657 printk("pfkey: Unknown SA event %d\n", c->event); 2658 break; 2659 } 2660 2661 return 0; 2662 } 2663 2664 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2665 { 2666 switch (c->event) { 2667 case XFRM_MSG_POLEXPIRE: 2668 return key_notify_policy_expire(xp, c); 2669 case XFRM_MSG_DELPOLICY: 2670 case XFRM_MSG_NEWPOLICY: 2671 case XFRM_MSG_UPDPOLICY: 2672 return key_notify_policy(xp, dir, c); 2673 case XFRM_MSG_FLUSHPOLICY: 2674 return key_notify_policy_flush(c); 2675 default: 2676 printk("pfkey: Unknown policy event %d\n", c->event); 2677 break; 2678 } 2679 2680 return 0; 2681 } 2682 2683 static u32 get_acqseq(void) 2684 { 2685 u32 res; 2686 static u32 acqseq; 2687 static DEFINE_SPINLOCK(acqseq_lock); 2688 2689 spin_lock_bh(&acqseq_lock); 2690 res = (++acqseq ? : ++acqseq); 2691 spin_unlock_bh(&acqseq_lock); 2692 return res; 2693 } 2694 2695 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 2696 { 2697 struct sk_buff *skb; 2698 struct sadb_msg *hdr; 2699 struct sadb_address *addr; 2700 struct sadb_x_policy *pol; 2701 struct sockaddr_in *sin; 2702 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2703 struct sockaddr_in6 *sin6; 2704 #endif 2705 int sockaddr_size; 2706 int size; 2707 2708 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2709 if (!sockaddr_size) 2710 return -EINVAL; 2711 2712 size = sizeof(struct sadb_msg) + 2713 (sizeof(struct sadb_address) * 2) + 2714 (sockaddr_size * 2) + 2715 sizeof(struct sadb_x_policy); 2716 2717 if (x->id.proto == IPPROTO_AH) 2718 size += count_ah_combs(t); 2719 else if (x->id.proto == IPPROTO_ESP) 2720 size += count_esp_combs(t); 2721 2722 skb = alloc_skb(size + 16, GFP_ATOMIC); 2723 if (skb == NULL) 2724 return -ENOMEM; 2725 2726 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2727 hdr->sadb_msg_version = PF_KEY_V2; 2728 hdr->sadb_msg_type = SADB_ACQUIRE; 2729 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2730 hdr->sadb_msg_len = size / sizeof(uint64_t); 2731 hdr->sadb_msg_errno = 0; 2732 hdr->sadb_msg_reserved = 0; 2733 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2734 hdr->sadb_msg_pid = 0; 2735 2736 /* src address */ 2737 addr = (struct sadb_address*) skb_put(skb, 2738 sizeof(struct sadb_address)+sockaddr_size); 2739 addr->sadb_address_len = 2740 (sizeof(struct sadb_address)+sockaddr_size)/ 2741 sizeof(uint64_t); 2742 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2743 addr->sadb_address_proto = 0; 2744 addr->sadb_address_reserved = 0; 2745 if (x->props.family == AF_INET) { 2746 addr->sadb_address_prefixlen = 32; 2747 2748 sin = (struct sockaddr_in *) (addr + 1); 2749 sin->sin_family = AF_INET; 2750 sin->sin_addr.s_addr = x->props.saddr.a4; 2751 sin->sin_port = 0; 2752 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2753 } 2754 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2755 else if (x->props.family == AF_INET6) { 2756 addr->sadb_address_prefixlen = 128; 2757 2758 sin6 = (struct sockaddr_in6 *) (addr + 1); 2759 sin6->sin6_family = AF_INET6; 2760 sin6->sin6_port = 0; 2761 sin6->sin6_flowinfo = 0; 2762 memcpy(&sin6->sin6_addr, 2763 x->props.saddr.a6, sizeof(struct in6_addr)); 2764 sin6->sin6_scope_id = 0; 2765 } 2766 #endif 2767 else 2768 BUG(); 2769 2770 /* dst address */ 2771 addr = (struct sadb_address*) skb_put(skb, 2772 sizeof(struct sadb_address)+sockaddr_size); 2773 addr->sadb_address_len = 2774 (sizeof(struct sadb_address)+sockaddr_size)/ 2775 sizeof(uint64_t); 2776 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 2777 addr->sadb_address_proto = 0; 2778 addr->sadb_address_reserved = 0; 2779 if (x->props.family == AF_INET) { 2780 addr->sadb_address_prefixlen = 32; 2781 2782 sin = (struct sockaddr_in *) (addr + 1); 2783 sin->sin_family = AF_INET; 2784 sin->sin_addr.s_addr = x->id.daddr.a4; 2785 sin->sin_port = 0; 2786 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2787 } 2788 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2789 else if (x->props.family == AF_INET6) { 2790 addr->sadb_address_prefixlen = 128; 2791 2792 sin6 = (struct sockaddr_in6 *) (addr + 1); 2793 sin6->sin6_family = AF_INET6; 2794 sin6->sin6_port = 0; 2795 sin6->sin6_flowinfo = 0; 2796 memcpy(&sin6->sin6_addr, 2797 x->id.daddr.a6, sizeof(struct in6_addr)); 2798 sin6->sin6_scope_id = 0; 2799 } 2800 #endif 2801 else 2802 BUG(); 2803 2804 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2805 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2806 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2807 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2808 pol->sadb_x_policy_dir = dir+1; 2809 pol->sadb_x_policy_id = xp->index; 2810 2811 /* Set sadb_comb's. */ 2812 if (x->id.proto == IPPROTO_AH) 2813 dump_ah_combs(skb, t); 2814 else if (x->id.proto == IPPROTO_ESP) 2815 dump_esp_combs(skb, t); 2816 2817 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2818 } 2819 2820 static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt, 2821 u8 *data, int len, int *dir) 2822 { 2823 struct xfrm_policy *xp; 2824 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 2825 struct sadb_x_sec_ctx *sec_ctx; 2826 2827 switch (family) { 2828 case AF_INET: 2829 if (opt != IP_IPSEC_POLICY) { 2830 *dir = -EOPNOTSUPP; 2831 return NULL; 2832 } 2833 break; 2834 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2835 case AF_INET6: 2836 if (opt != IPV6_IPSEC_POLICY) { 2837 *dir = -EOPNOTSUPP; 2838 return NULL; 2839 } 2840 break; 2841 #endif 2842 default: 2843 *dir = -EINVAL; 2844 return NULL; 2845 } 2846 2847 *dir = -EINVAL; 2848 2849 if (len < sizeof(struct sadb_x_policy) || 2850 pol->sadb_x_policy_len*8 > len || 2851 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 2852 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 2853 return NULL; 2854 2855 xp = xfrm_policy_alloc(GFP_ATOMIC); 2856 if (xp == NULL) { 2857 *dir = -ENOBUFS; 2858 return NULL; 2859 } 2860 2861 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2862 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2863 2864 xp->lft.soft_byte_limit = XFRM_INF; 2865 xp->lft.hard_byte_limit = XFRM_INF; 2866 xp->lft.soft_packet_limit = XFRM_INF; 2867 xp->lft.hard_packet_limit = XFRM_INF; 2868 xp->family = family; 2869 2870 xp->xfrm_nr = 0; 2871 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2872 (*dir = parse_ipsecrequests(xp, pol)) < 0) 2873 goto out; 2874 2875 /* security context too */ 2876 if (len >= (pol->sadb_x_policy_len*8 + 2877 sizeof(struct sadb_x_sec_ctx))) { 2878 char *p = (char *)pol; 2879 struct xfrm_user_sec_ctx *uctx; 2880 2881 p += pol->sadb_x_policy_len*8; 2882 sec_ctx = (struct sadb_x_sec_ctx *)p; 2883 if (len < pol->sadb_x_policy_len*8 + 2884 sec_ctx->sadb_x_sec_len) 2885 goto out; 2886 if ((*dir = verify_sec_ctx_len(p))) 2887 goto out; 2888 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2889 *dir = security_xfrm_policy_alloc(xp, uctx); 2890 kfree(uctx); 2891 2892 if (*dir) 2893 goto out; 2894 } 2895 2896 *dir = pol->sadb_x_policy_dir-1; 2897 return xp; 2898 2899 out: 2900 security_xfrm_policy_free(xp); 2901 kfree(xp); 2902 return NULL; 2903 } 2904 2905 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) 2906 { 2907 struct sk_buff *skb; 2908 struct sadb_msg *hdr; 2909 struct sadb_sa *sa; 2910 struct sadb_address *addr; 2911 struct sadb_x_nat_t_port *n_port; 2912 struct sockaddr_in *sin; 2913 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2914 struct sockaddr_in6 *sin6; 2915 #endif 2916 int sockaddr_size; 2917 int size; 2918 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 2919 struct xfrm_encap_tmpl *natt = NULL; 2920 2921 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2922 if (!sockaddr_size) 2923 return -EINVAL; 2924 2925 if (!satype) 2926 return -EINVAL; 2927 2928 if (!x->encap) 2929 return -EINVAL; 2930 2931 natt = x->encap; 2932 2933 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 2934 * 2935 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 2936 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 2937 */ 2938 2939 size = sizeof(struct sadb_msg) + 2940 sizeof(struct sadb_sa) + 2941 (sizeof(struct sadb_address) * 2) + 2942 (sockaddr_size * 2) + 2943 (sizeof(struct sadb_x_nat_t_port) * 2); 2944 2945 skb = alloc_skb(size + 16, GFP_ATOMIC); 2946 if (skb == NULL) 2947 return -ENOMEM; 2948 2949 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2950 hdr->sadb_msg_version = PF_KEY_V2; 2951 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 2952 hdr->sadb_msg_satype = satype; 2953 hdr->sadb_msg_len = size / sizeof(uint64_t); 2954 hdr->sadb_msg_errno = 0; 2955 hdr->sadb_msg_reserved = 0; 2956 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2957 hdr->sadb_msg_pid = 0; 2958 2959 /* SA */ 2960 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 2961 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 2962 sa->sadb_sa_exttype = SADB_EXT_SA; 2963 sa->sadb_sa_spi = x->id.spi; 2964 sa->sadb_sa_replay = 0; 2965 sa->sadb_sa_state = 0; 2966 sa->sadb_sa_auth = 0; 2967 sa->sadb_sa_encrypt = 0; 2968 sa->sadb_sa_flags = 0; 2969 2970 /* ADDRESS_SRC (old addr) */ 2971 addr = (struct sadb_address*) 2972 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 2973 addr->sadb_address_len = 2974 (sizeof(struct sadb_address)+sockaddr_size)/ 2975 sizeof(uint64_t); 2976 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2977 addr->sadb_address_proto = 0; 2978 addr->sadb_address_reserved = 0; 2979 if (x->props.family == AF_INET) { 2980 addr->sadb_address_prefixlen = 32; 2981 2982 sin = (struct sockaddr_in *) (addr + 1); 2983 sin->sin_family = AF_INET; 2984 sin->sin_addr.s_addr = x->props.saddr.a4; 2985 sin->sin_port = 0; 2986 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2987 } 2988 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2989 else if (x->props.family == AF_INET6) { 2990 addr->sadb_address_prefixlen = 128; 2991 2992 sin6 = (struct sockaddr_in6 *) (addr + 1); 2993 sin6->sin6_family = AF_INET6; 2994 sin6->sin6_port = 0; 2995 sin6->sin6_flowinfo = 0; 2996 memcpy(&sin6->sin6_addr, 2997 x->props.saddr.a6, sizeof(struct in6_addr)); 2998 sin6->sin6_scope_id = 0; 2999 } 3000 #endif 3001 else 3002 BUG(); 3003 3004 /* NAT_T_SPORT (old port) */ 3005 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3006 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3007 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3008 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3009 n_port->sadb_x_nat_t_port_reserved = 0; 3010 3011 /* ADDRESS_DST (new addr) */ 3012 addr = (struct sadb_address*) 3013 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3014 addr->sadb_address_len = 3015 (sizeof(struct sadb_address)+sockaddr_size)/ 3016 sizeof(uint64_t); 3017 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3018 addr->sadb_address_proto = 0; 3019 addr->sadb_address_reserved = 0; 3020 if (x->props.family == AF_INET) { 3021 addr->sadb_address_prefixlen = 32; 3022 3023 sin = (struct sockaddr_in *) (addr + 1); 3024 sin->sin_family = AF_INET; 3025 sin->sin_addr.s_addr = ipaddr->a4; 3026 sin->sin_port = 0; 3027 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3028 } 3029 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3030 else if (x->props.family == AF_INET6) { 3031 addr->sadb_address_prefixlen = 128; 3032 3033 sin6 = (struct sockaddr_in6 *) (addr + 1); 3034 sin6->sin6_family = AF_INET6; 3035 sin6->sin6_port = 0; 3036 sin6->sin6_flowinfo = 0; 3037 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); 3038 sin6->sin6_scope_id = 0; 3039 } 3040 #endif 3041 else 3042 BUG(); 3043 3044 /* NAT_T_DPORT (new port) */ 3045 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3046 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3047 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3048 n_port->sadb_x_nat_t_port_port = sport; 3049 n_port->sadb_x_nat_t_port_reserved = 0; 3050 3051 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 3052 } 3053 3054 static int pfkey_sendmsg(struct kiocb *kiocb, 3055 struct socket *sock, struct msghdr *msg, size_t len) 3056 { 3057 struct sock *sk = sock->sk; 3058 struct sk_buff *skb = NULL; 3059 struct sadb_msg *hdr = NULL; 3060 int err; 3061 3062 err = -EOPNOTSUPP; 3063 if (msg->msg_flags & MSG_OOB) 3064 goto out; 3065 3066 err = -EMSGSIZE; 3067 if ((unsigned)len > sk->sk_sndbuf - 32) 3068 goto out; 3069 3070 err = -ENOBUFS; 3071 skb = alloc_skb(len, GFP_KERNEL); 3072 if (skb == NULL) 3073 goto out; 3074 3075 err = -EFAULT; 3076 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3077 goto out; 3078 3079 hdr = pfkey_get_base_msg(skb, &err); 3080 if (!hdr) 3081 goto out; 3082 3083 mutex_lock(&xfrm_cfg_mutex); 3084 err = pfkey_process(sk, skb, hdr); 3085 mutex_unlock(&xfrm_cfg_mutex); 3086 3087 out: 3088 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3089 err = 0; 3090 if (skb) 3091 kfree_skb(skb); 3092 3093 return err ? : len; 3094 } 3095 3096 static int pfkey_recvmsg(struct kiocb *kiocb, 3097 struct socket *sock, struct msghdr *msg, size_t len, 3098 int flags) 3099 { 3100 struct sock *sk = sock->sk; 3101 struct sk_buff *skb; 3102 int copied, err; 3103 3104 err = -EINVAL; 3105 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3106 goto out; 3107 3108 msg->msg_namelen = 0; 3109 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3110 if (skb == NULL) 3111 goto out; 3112 3113 copied = skb->len; 3114 if (copied > len) { 3115 msg->msg_flags |= MSG_TRUNC; 3116 copied = len; 3117 } 3118 3119 skb->h.raw = skb->data; 3120 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3121 if (err) 3122 goto out_free; 3123 3124 sock_recv_timestamp(msg, sk, skb); 3125 3126 err = (flags & MSG_TRUNC) ? skb->len : copied; 3127 3128 out_free: 3129 skb_free_datagram(sk, skb); 3130 out: 3131 return err; 3132 } 3133 3134 static const struct proto_ops pfkey_ops = { 3135 .family = PF_KEY, 3136 .owner = THIS_MODULE, 3137 /* Operations that make no sense on pfkey sockets. */ 3138 .bind = sock_no_bind, 3139 .connect = sock_no_connect, 3140 .socketpair = sock_no_socketpair, 3141 .accept = sock_no_accept, 3142 .getname = sock_no_getname, 3143 .ioctl = sock_no_ioctl, 3144 .listen = sock_no_listen, 3145 .shutdown = sock_no_shutdown, 3146 .setsockopt = sock_no_setsockopt, 3147 .getsockopt = sock_no_getsockopt, 3148 .mmap = sock_no_mmap, 3149 .sendpage = sock_no_sendpage, 3150 3151 /* Now the operations that really occur. */ 3152 .release = pfkey_release, 3153 .poll = datagram_poll, 3154 .sendmsg = pfkey_sendmsg, 3155 .recvmsg = pfkey_recvmsg, 3156 }; 3157 3158 static struct net_proto_family pfkey_family_ops = { 3159 .family = PF_KEY, 3160 .create = pfkey_create, 3161 .owner = THIS_MODULE, 3162 }; 3163 3164 #ifdef CONFIG_PROC_FS 3165 static int pfkey_read_proc(char *buffer, char **start, off_t offset, 3166 int length, int *eof, void *data) 3167 { 3168 off_t pos = 0; 3169 off_t begin = 0; 3170 int len = 0; 3171 struct sock *s; 3172 struct hlist_node *node; 3173 3174 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); 3175 3176 read_lock(&pfkey_table_lock); 3177 3178 sk_for_each(s, node, &pfkey_table) { 3179 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", 3180 s, 3181 atomic_read(&s->sk_refcnt), 3182 atomic_read(&s->sk_rmem_alloc), 3183 atomic_read(&s->sk_wmem_alloc), 3184 sock_i_uid(s), 3185 sock_i_ino(s) 3186 ); 3187 3188 buffer[len++] = '\n'; 3189 3190 pos = begin + len; 3191 if (pos < offset) { 3192 len = 0; 3193 begin = pos; 3194 } 3195 if(pos > offset + length) 3196 goto done; 3197 } 3198 *eof = 1; 3199 3200 done: 3201 read_unlock(&pfkey_table_lock); 3202 3203 *start = buffer + (offset - begin); 3204 len -= (offset - begin); 3205 3206 if (len > length) 3207 len = length; 3208 if (len < 0) 3209 len = 0; 3210 3211 return len; 3212 } 3213 #endif 3214 3215 static struct xfrm_mgr pfkeyv2_mgr = 3216 { 3217 .id = "pfkeyv2", 3218 .notify = pfkey_send_notify, 3219 .acquire = pfkey_send_acquire, 3220 .compile_policy = pfkey_compile_policy, 3221 .new_mapping = pfkey_send_new_mapping, 3222 .notify_policy = pfkey_send_policy_notify, 3223 }; 3224 3225 static void __exit ipsec_pfkey_exit(void) 3226 { 3227 xfrm_unregister_km(&pfkeyv2_mgr); 3228 remove_proc_entry("net/pfkey", NULL); 3229 sock_unregister(PF_KEY); 3230 proto_unregister(&key_proto); 3231 } 3232 3233 static int __init ipsec_pfkey_init(void) 3234 { 3235 int err = proto_register(&key_proto, 0); 3236 3237 if (err != 0) 3238 goto out; 3239 3240 err = sock_register(&pfkey_family_ops); 3241 if (err != 0) 3242 goto out_unregister_key_proto; 3243 #ifdef CONFIG_PROC_FS 3244 err = -ENOMEM; 3245 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) 3246 goto out_sock_unregister; 3247 #endif 3248 err = xfrm_register_km(&pfkeyv2_mgr); 3249 if (err != 0) 3250 goto out_remove_proc_entry; 3251 out: 3252 return err; 3253 out_remove_proc_entry: 3254 #ifdef CONFIG_PROC_FS 3255 remove_proc_entry("net/pfkey", NULL); 3256 out_sock_unregister: 3257 #endif 3258 sock_unregister(PF_KEY); 3259 out_unregister_key_proto: 3260 proto_unregister(&key_proto); 3261 goto out; 3262 } 3263 3264 module_init(ipsec_pfkey_init); 3265 module_exit(ipsec_pfkey_exit); 3266 MODULE_LICENSE("GPL"); 3267 MODULE_ALIAS_NETPROTO(PF_KEY); 3268