1 /* 2 * net/key/af_key.c An implementation of PF_KEYv2 sockets. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Maxim Giryaev <gem@asplinux.ru> 10 * David S. Miller <davem@redhat.com> 11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 12 * Kunihiro Ishiguro <kunihiro@ipinfusion.com> 13 * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> 14 * Derek Atkins <derek@ihtfp.com> 15 */ 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/kernel.h> 20 #include <linux/socket.h> 21 #include <linux/pfkeyv2.h> 22 #include <linux/ipsec.h> 23 #include <linux/skbuff.h> 24 #include <linux/rtnetlink.h> 25 #include <linux/in.h> 26 #include <linux/in6.h> 27 #include <linux/proc_fs.h> 28 #include <linux/init.h> 29 #include <net/xfrm.h> 30 #include <linux/audit.h> 31 32 #include <net/sock.h> 33 34 #define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) 35 #define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) 36 37 38 /* List of all pfkey sockets. */ 39 static HLIST_HEAD(pfkey_table); 40 static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); 41 static DEFINE_RWLOCK(pfkey_table_lock); 42 static atomic_t pfkey_table_users = ATOMIC_INIT(0); 43 44 static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); 45 46 struct pfkey_sock { 47 /* struct sock must be the first member of struct pfkey_sock */ 48 struct sock sk; 49 int registered; 50 int promisc; 51 }; 52 53 static inline struct pfkey_sock *pfkey_sk(struct sock *sk) 54 { 55 return (struct pfkey_sock *)sk; 56 } 57 58 static void pfkey_sock_destruct(struct sock *sk) 59 { 60 skb_queue_purge(&sk->sk_receive_queue); 61 62 if (!sock_flag(sk, SOCK_DEAD)) { 63 printk("Attempt to release alive pfkey socket: %p\n", sk); 64 return; 65 } 66 67 BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); 68 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); 69 70 atomic_dec(&pfkey_socks_nr); 71 } 72 73 static void pfkey_table_grab(void) 74 { 75 write_lock_bh(&pfkey_table_lock); 76 77 if (atomic_read(&pfkey_table_users)) { 78 DECLARE_WAITQUEUE(wait, current); 79 80 add_wait_queue_exclusive(&pfkey_table_wait, &wait); 81 for(;;) { 82 set_current_state(TASK_UNINTERRUPTIBLE); 83 if (atomic_read(&pfkey_table_users) == 0) 84 break; 85 write_unlock_bh(&pfkey_table_lock); 86 schedule(); 87 write_lock_bh(&pfkey_table_lock); 88 } 89 90 __set_current_state(TASK_RUNNING); 91 remove_wait_queue(&pfkey_table_wait, &wait); 92 } 93 } 94 95 static __inline__ void pfkey_table_ungrab(void) 96 { 97 write_unlock_bh(&pfkey_table_lock); 98 wake_up(&pfkey_table_wait); 99 } 100 101 static __inline__ void pfkey_lock_table(void) 102 { 103 /* read_lock() synchronizes us to pfkey_table_grab */ 104 105 read_lock(&pfkey_table_lock); 106 atomic_inc(&pfkey_table_users); 107 read_unlock(&pfkey_table_lock); 108 } 109 110 static __inline__ void pfkey_unlock_table(void) 111 { 112 if (atomic_dec_and_test(&pfkey_table_users)) 113 wake_up(&pfkey_table_wait); 114 } 115 116 117 static const struct proto_ops pfkey_ops; 118 119 static void pfkey_insert(struct sock *sk) 120 { 121 pfkey_table_grab(); 122 sk_add_node(sk, &pfkey_table); 123 pfkey_table_ungrab(); 124 } 125 126 static void pfkey_remove(struct sock *sk) 127 { 128 pfkey_table_grab(); 129 sk_del_node_init(sk); 130 pfkey_table_ungrab(); 131 } 132 133 static struct proto key_proto = { 134 .name = "KEY", 135 .owner = THIS_MODULE, 136 .obj_size = sizeof(struct pfkey_sock), 137 }; 138 139 static int pfkey_create(struct socket *sock, int protocol) 140 { 141 struct sock *sk; 142 int err; 143 144 if (!capable(CAP_NET_ADMIN)) 145 return -EPERM; 146 if (sock->type != SOCK_RAW) 147 return -ESOCKTNOSUPPORT; 148 if (protocol != PF_KEY_V2) 149 return -EPROTONOSUPPORT; 150 151 err = -ENOMEM; 152 sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1); 153 if (sk == NULL) 154 goto out; 155 156 sock->ops = &pfkey_ops; 157 sock_init_data(sock, sk); 158 159 sk->sk_family = PF_KEY; 160 sk->sk_destruct = pfkey_sock_destruct; 161 162 atomic_inc(&pfkey_socks_nr); 163 164 pfkey_insert(sk); 165 166 return 0; 167 out: 168 return err; 169 } 170 171 static int pfkey_release(struct socket *sock) 172 { 173 struct sock *sk = sock->sk; 174 175 if (!sk) 176 return 0; 177 178 pfkey_remove(sk); 179 180 sock_orphan(sk); 181 sock->sk = NULL; 182 skb_queue_purge(&sk->sk_write_queue); 183 sock_put(sk); 184 185 return 0; 186 } 187 188 static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, 189 gfp_t allocation, struct sock *sk) 190 { 191 int err = -ENOBUFS; 192 193 sock_hold(sk); 194 if (*skb2 == NULL) { 195 if (atomic_read(&skb->users) != 1) { 196 *skb2 = skb_clone(skb, allocation); 197 } else { 198 *skb2 = skb; 199 atomic_inc(&skb->users); 200 } 201 } 202 if (*skb2 != NULL) { 203 if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { 204 skb_orphan(*skb2); 205 skb_set_owner_r(*skb2, sk); 206 skb_queue_tail(&sk->sk_receive_queue, *skb2); 207 sk->sk_data_ready(sk, (*skb2)->len); 208 *skb2 = NULL; 209 err = 0; 210 } 211 } 212 sock_put(sk); 213 return err; 214 } 215 216 /* Send SKB to all pfkey sockets matching selected criteria. */ 217 #define BROADCAST_ALL 0 218 #define BROADCAST_ONE 1 219 #define BROADCAST_REGISTERED 2 220 #define BROADCAST_PROMISC_ONLY 4 221 static int pfkey_broadcast(struct sk_buff *skb, gfp_t allocation, 222 int broadcast_flags, struct sock *one_sk) 223 { 224 struct sock *sk; 225 struct hlist_node *node; 226 struct sk_buff *skb2 = NULL; 227 int err = -ESRCH; 228 229 /* XXX Do we need something like netlink_overrun? I think 230 * XXX PF_KEY socket apps will not mind current behavior. 231 */ 232 if (!skb) 233 return -ENOMEM; 234 235 pfkey_lock_table(); 236 sk_for_each(sk, node, &pfkey_table) { 237 struct pfkey_sock *pfk = pfkey_sk(sk); 238 int err2; 239 240 /* Yes, it means that if you are meant to receive this 241 * pfkey message you receive it twice as promiscuous 242 * socket. 243 */ 244 if (pfk->promisc) 245 pfkey_broadcast_one(skb, &skb2, allocation, sk); 246 247 /* the exact target will be processed later */ 248 if (sk == one_sk) 249 continue; 250 if (broadcast_flags != BROADCAST_ALL) { 251 if (broadcast_flags & BROADCAST_PROMISC_ONLY) 252 continue; 253 if ((broadcast_flags & BROADCAST_REGISTERED) && 254 !pfk->registered) 255 continue; 256 if (broadcast_flags & BROADCAST_ONE) 257 continue; 258 } 259 260 err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); 261 262 /* Error is cleare after succecful sending to at least one 263 * registered KM */ 264 if ((broadcast_flags & BROADCAST_REGISTERED) && err) 265 err = err2; 266 } 267 pfkey_unlock_table(); 268 269 if (one_sk != NULL) 270 err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); 271 272 if (skb2) 273 kfree_skb(skb2); 274 kfree_skb(skb); 275 return err; 276 } 277 278 static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) 279 { 280 *new = *orig; 281 } 282 283 static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) 284 { 285 struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); 286 struct sadb_msg *hdr; 287 288 if (!skb) 289 return -ENOBUFS; 290 291 /* Woe be to the platform trying to support PFKEY yet 292 * having normal errnos outside the 1-255 range, inclusive. 293 */ 294 err = -err; 295 if (err == ERESTARTSYS || 296 err == ERESTARTNOHAND || 297 err == ERESTARTNOINTR) 298 err = EINTR; 299 if (err >= 512) 300 err = EINVAL; 301 BUG_ON(err <= 0 || err >= 256); 302 303 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 304 pfkey_hdr_dup(hdr, orig); 305 hdr->sadb_msg_errno = (uint8_t) err; 306 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / 307 sizeof(uint64_t)); 308 309 pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); 310 311 return 0; 312 } 313 314 static u8 sadb_ext_min_len[] = { 315 [SADB_EXT_RESERVED] = (u8) 0, 316 [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), 317 [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), 318 [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), 319 [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), 320 [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), 321 [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), 322 [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), 323 [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), 324 [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), 325 [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), 326 [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), 327 [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), 328 [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), 329 [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), 330 [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), 331 [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), 332 [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), 333 [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), 334 [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), 335 [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), 336 [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 337 [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), 338 [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), 339 [SADB_X_EXT_SEC_CTX] = (u8) sizeof(struct sadb_x_sec_ctx), 340 }; 341 342 /* Verify sadb_address_{len,prefixlen} against sa_family. */ 343 static int verify_address_len(void *p) 344 { 345 struct sadb_address *sp = p; 346 struct sockaddr *addr = (struct sockaddr *)(sp + 1); 347 struct sockaddr_in *sin; 348 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 349 struct sockaddr_in6 *sin6; 350 #endif 351 int len; 352 353 switch (addr->sa_family) { 354 case AF_INET: 355 len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); 356 len /= sizeof(uint64_t); 357 if (sp->sadb_address_len != len || 358 sp->sadb_address_prefixlen > 32) 359 return -EINVAL; 360 break; 361 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 362 case AF_INET6: 363 len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); 364 len /= sizeof(uint64_t); 365 if (sp->sadb_address_len != len || 366 sp->sadb_address_prefixlen > 128) 367 return -EINVAL; 368 break; 369 #endif 370 default: 371 /* It is user using kernel to keep track of security 372 * associations for another protocol, such as 373 * OSPF/RSVP/RIPV2/MIP. It is user's job to verify 374 * lengths. 375 * 376 * XXX Actually, association/policy database is not yet 377 * XXX able to cope with arbitrary sockaddr families. 378 * XXX When it can, remove this -EINVAL. -DaveM 379 */ 380 return -EINVAL; 381 break; 382 }; 383 384 return 0; 385 } 386 387 static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx) 388 { 389 int len = 0; 390 391 len += sizeof(struct sadb_x_sec_ctx); 392 len += sec_ctx->sadb_x_ctx_len; 393 len += sizeof(uint64_t) - 1; 394 len /= sizeof(uint64_t); 395 396 return len; 397 } 398 399 static inline int verify_sec_ctx_len(void *p) 400 { 401 struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p; 402 int len; 403 404 if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE) 405 return -EINVAL; 406 407 len = pfkey_sec_ctx_len(sec_ctx); 408 409 if (sec_ctx->sadb_x_sec_len != len) 410 return -EINVAL; 411 412 return 0; 413 } 414 415 static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx) 416 { 417 struct xfrm_user_sec_ctx *uctx = NULL; 418 int ctx_size = sec_ctx->sadb_x_ctx_len; 419 420 uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL); 421 422 if (!uctx) 423 return NULL; 424 425 uctx->len = pfkey_sec_ctx_len(sec_ctx); 426 uctx->exttype = sec_ctx->sadb_x_sec_exttype; 427 uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi; 428 uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg; 429 uctx->ctx_len = sec_ctx->sadb_x_ctx_len; 430 memcpy(uctx + 1, sec_ctx + 1, 431 uctx->ctx_len); 432 433 return uctx; 434 } 435 436 static int present_and_same_family(struct sadb_address *src, 437 struct sadb_address *dst) 438 { 439 struct sockaddr *s_addr, *d_addr; 440 441 if (!src || !dst) 442 return 0; 443 444 s_addr = (struct sockaddr *)(src + 1); 445 d_addr = (struct sockaddr *)(dst + 1); 446 if (s_addr->sa_family != d_addr->sa_family) 447 return 0; 448 if (s_addr->sa_family != AF_INET 449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 450 && s_addr->sa_family != AF_INET6 451 #endif 452 ) 453 return 0; 454 455 return 1; 456 } 457 458 static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 459 { 460 char *p = (char *) hdr; 461 int len = skb->len; 462 463 len -= sizeof(*hdr); 464 p += sizeof(*hdr); 465 while (len > 0) { 466 struct sadb_ext *ehdr = (struct sadb_ext *) p; 467 uint16_t ext_type; 468 int ext_len; 469 470 ext_len = ehdr->sadb_ext_len; 471 ext_len *= sizeof(uint64_t); 472 ext_type = ehdr->sadb_ext_type; 473 if (ext_len < sizeof(uint64_t) || 474 ext_len > len || 475 ext_type == SADB_EXT_RESERVED) 476 return -EINVAL; 477 478 if (ext_type <= SADB_EXT_MAX) { 479 int min = (int) sadb_ext_min_len[ext_type]; 480 if (ext_len < min) 481 return -EINVAL; 482 if (ext_hdrs[ext_type-1] != NULL) 483 return -EINVAL; 484 if (ext_type == SADB_EXT_ADDRESS_SRC || 485 ext_type == SADB_EXT_ADDRESS_DST || 486 ext_type == SADB_EXT_ADDRESS_PROXY || 487 ext_type == SADB_X_EXT_NAT_T_OA) { 488 if (verify_address_len(p)) 489 return -EINVAL; 490 } 491 if (ext_type == SADB_X_EXT_SEC_CTX) { 492 if (verify_sec_ctx_len(p)) 493 return -EINVAL; 494 } 495 ext_hdrs[ext_type-1] = p; 496 } 497 p += ext_len; 498 len -= ext_len; 499 } 500 501 return 0; 502 } 503 504 static uint16_t 505 pfkey_satype2proto(uint8_t satype) 506 { 507 switch (satype) { 508 case SADB_SATYPE_UNSPEC: 509 return IPSEC_PROTO_ANY; 510 case SADB_SATYPE_AH: 511 return IPPROTO_AH; 512 case SADB_SATYPE_ESP: 513 return IPPROTO_ESP; 514 case SADB_X_SATYPE_IPCOMP: 515 return IPPROTO_COMP; 516 break; 517 default: 518 return 0; 519 } 520 /* NOTREACHED */ 521 } 522 523 static uint8_t 524 pfkey_proto2satype(uint16_t proto) 525 { 526 switch (proto) { 527 case IPPROTO_AH: 528 return SADB_SATYPE_AH; 529 case IPPROTO_ESP: 530 return SADB_SATYPE_ESP; 531 case IPPROTO_COMP: 532 return SADB_X_SATYPE_IPCOMP; 533 break; 534 default: 535 return 0; 536 } 537 /* NOTREACHED */ 538 } 539 540 /* BTW, this scheme means that there is no way with PFKEY2 sockets to 541 * say specifically 'just raw sockets' as we encode them as 255. 542 */ 543 544 static uint8_t pfkey_proto_to_xfrm(uint8_t proto) 545 { 546 return (proto == IPSEC_PROTO_ANY ? 0 : proto); 547 } 548 549 static uint8_t pfkey_proto_from_xfrm(uint8_t proto) 550 { 551 return (proto ? proto : IPSEC_PROTO_ANY); 552 } 553 554 static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, 555 xfrm_address_t *xaddr) 556 { 557 switch (((struct sockaddr*)(addr + 1))->sa_family) { 558 case AF_INET: 559 xaddr->a4 = 560 ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; 561 return AF_INET; 562 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 563 case AF_INET6: 564 memcpy(xaddr->a6, 565 &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, 566 sizeof(struct in6_addr)); 567 return AF_INET6; 568 #endif 569 default: 570 return 0; 571 } 572 /* NOTREACHED */ 573 } 574 575 static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) 576 { 577 struct sadb_sa *sa; 578 struct sadb_address *addr; 579 uint16_t proto; 580 unsigned short family; 581 xfrm_address_t *xaddr; 582 583 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 584 if (sa == NULL) 585 return NULL; 586 587 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 588 if (proto == 0) 589 return NULL; 590 591 /* sadb_address_len should be checked by caller */ 592 addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 593 if (addr == NULL) 594 return NULL; 595 596 family = ((struct sockaddr *)(addr + 1))->sa_family; 597 switch (family) { 598 case AF_INET: 599 xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; 600 break; 601 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 602 case AF_INET6: 603 xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; 604 break; 605 #endif 606 default: 607 xaddr = NULL; 608 } 609 610 if (!xaddr) 611 return NULL; 612 613 return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); 614 } 615 616 #define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) 617 static int 618 pfkey_sockaddr_size(sa_family_t family) 619 { 620 switch (family) { 621 case AF_INET: 622 return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); 623 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 624 case AF_INET6: 625 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); 626 #endif 627 default: 628 return 0; 629 } 630 /* NOTREACHED */ 631 } 632 633 static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) 634 { 635 struct sk_buff *skb; 636 struct sadb_msg *hdr; 637 struct sadb_sa *sa; 638 struct sadb_lifetime *lifetime; 639 struct sadb_address *addr; 640 struct sadb_key *key; 641 struct sadb_x_sa2 *sa2; 642 struct sockaddr_in *sin; 643 struct sadb_x_sec_ctx *sec_ctx; 644 struct xfrm_sec_ctx *xfrm_ctx; 645 int ctx_size = 0; 646 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 647 struct sockaddr_in6 *sin6; 648 #endif 649 int size; 650 int auth_key_size = 0; 651 int encrypt_key_size = 0; 652 int sockaddr_size; 653 struct xfrm_encap_tmpl *natt = NULL; 654 655 /* address family check */ 656 sockaddr_size = pfkey_sockaddr_size(x->props.family); 657 if (!sockaddr_size) 658 return ERR_PTR(-EINVAL); 659 660 /* base, SA, (lifetime (HSC),) address(SD), (address(P),) 661 key(AE), (identity(SD),) (sensitivity)> */ 662 size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + 663 sizeof(struct sadb_lifetime) + 664 ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + 665 ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + 666 sizeof(struct sadb_address)*2 + 667 sockaddr_size*2 + 668 sizeof(struct sadb_x_sa2); 669 670 if ((xfrm_ctx = x->security)) { 671 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 672 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 673 } 674 675 /* identity & sensitivity */ 676 677 if ((x->props.family == AF_INET && 678 x->sel.saddr.a4 != x->props.saddr.a4) 679 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 680 || (x->props.family == AF_INET6 && 681 memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) 682 #endif 683 ) 684 size += sizeof(struct sadb_address) + sockaddr_size; 685 686 if (add_keys) { 687 if (x->aalg && x->aalg->alg_key_len) { 688 auth_key_size = 689 PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); 690 size += sizeof(struct sadb_key) + auth_key_size; 691 } 692 if (x->ealg && x->ealg->alg_key_len) { 693 encrypt_key_size = 694 PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); 695 size += sizeof(struct sadb_key) + encrypt_key_size; 696 } 697 } 698 if (x->encap) 699 natt = x->encap; 700 701 if (natt && natt->encap_type) { 702 size += sizeof(struct sadb_x_nat_t_type); 703 size += sizeof(struct sadb_x_nat_t_port); 704 size += sizeof(struct sadb_x_nat_t_port); 705 } 706 707 skb = alloc_skb(size + 16, GFP_ATOMIC); 708 if (skb == NULL) 709 return ERR_PTR(-ENOBUFS); 710 711 /* call should fill header later */ 712 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 713 memset(hdr, 0, size); /* XXX do we need this ? */ 714 hdr->sadb_msg_len = size / sizeof(uint64_t); 715 716 /* sa */ 717 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 718 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 719 sa->sadb_sa_exttype = SADB_EXT_SA; 720 sa->sadb_sa_spi = x->id.spi; 721 sa->sadb_sa_replay = x->props.replay_window; 722 switch (x->km.state) { 723 case XFRM_STATE_VALID: 724 sa->sadb_sa_state = x->km.dying ? 725 SADB_SASTATE_DYING : SADB_SASTATE_MATURE; 726 break; 727 case XFRM_STATE_ACQ: 728 sa->sadb_sa_state = SADB_SASTATE_LARVAL; 729 break; 730 default: 731 sa->sadb_sa_state = SADB_SASTATE_DEAD; 732 break; 733 } 734 sa->sadb_sa_auth = 0; 735 if (x->aalg) { 736 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); 737 sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; 738 } 739 sa->sadb_sa_encrypt = 0; 740 BUG_ON(x->ealg && x->calg); 741 if (x->ealg) { 742 struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); 743 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 744 } 745 /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ 746 if (x->calg) { 747 struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); 748 sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; 749 } 750 751 sa->sadb_sa_flags = 0; 752 if (x->props.flags & XFRM_STATE_NOECN) 753 sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; 754 if (x->props.flags & XFRM_STATE_DECAP_DSCP) 755 sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; 756 if (x->props.flags & XFRM_STATE_NOPMTUDISC) 757 sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC; 758 759 /* hard time */ 760 if (hsc & 2) { 761 lifetime = (struct sadb_lifetime *) skb_put(skb, 762 sizeof(struct sadb_lifetime)); 763 lifetime->sadb_lifetime_len = 764 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 765 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 766 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); 767 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); 768 lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; 769 lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; 770 } 771 /* soft time */ 772 if (hsc & 1) { 773 lifetime = (struct sadb_lifetime *) skb_put(skb, 774 sizeof(struct sadb_lifetime)); 775 lifetime->sadb_lifetime_len = 776 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 777 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 778 lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); 779 lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); 780 lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; 781 lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; 782 } 783 /* current time */ 784 lifetime = (struct sadb_lifetime *) skb_put(skb, 785 sizeof(struct sadb_lifetime)); 786 lifetime->sadb_lifetime_len = 787 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 788 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 789 lifetime->sadb_lifetime_allocations = x->curlft.packets; 790 lifetime->sadb_lifetime_bytes = x->curlft.bytes; 791 lifetime->sadb_lifetime_addtime = x->curlft.add_time; 792 lifetime->sadb_lifetime_usetime = x->curlft.use_time; 793 /* src address */ 794 addr = (struct sadb_address*) skb_put(skb, 795 sizeof(struct sadb_address)+sockaddr_size); 796 addr->sadb_address_len = 797 (sizeof(struct sadb_address)+sockaddr_size)/ 798 sizeof(uint64_t); 799 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 800 /* "if the ports are non-zero, then the sadb_address_proto field, 801 normally zero, MUST be filled in with the transport 802 protocol's number." - RFC2367 */ 803 addr->sadb_address_proto = 0; 804 addr->sadb_address_reserved = 0; 805 if (x->props.family == AF_INET) { 806 addr->sadb_address_prefixlen = 32; 807 808 sin = (struct sockaddr_in *) (addr + 1); 809 sin->sin_family = AF_INET; 810 sin->sin_addr.s_addr = x->props.saddr.a4; 811 sin->sin_port = 0; 812 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 813 } 814 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 815 else if (x->props.family == AF_INET6) { 816 addr->sadb_address_prefixlen = 128; 817 818 sin6 = (struct sockaddr_in6 *) (addr + 1); 819 sin6->sin6_family = AF_INET6; 820 sin6->sin6_port = 0; 821 sin6->sin6_flowinfo = 0; 822 memcpy(&sin6->sin6_addr, x->props.saddr.a6, 823 sizeof(struct in6_addr)); 824 sin6->sin6_scope_id = 0; 825 } 826 #endif 827 else 828 BUG(); 829 830 /* dst address */ 831 addr = (struct sadb_address*) skb_put(skb, 832 sizeof(struct sadb_address)+sockaddr_size); 833 addr->sadb_address_len = 834 (sizeof(struct sadb_address)+sockaddr_size)/ 835 sizeof(uint64_t); 836 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 837 addr->sadb_address_proto = 0; 838 addr->sadb_address_prefixlen = 32; /* XXX */ 839 addr->sadb_address_reserved = 0; 840 if (x->props.family == AF_INET) { 841 sin = (struct sockaddr_in *) (addr + 1); 842 sin->sin_family = AF_INET; 843 sin->sin_addr.s_addr = x->id.daddr.a4; 844 sin->sin_port = 0; 845 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 846 847 if (x->sel.saddr.a4 != x->props.saddr.a4) { 848 addr = (struct sadb_address*) skb_put(skb, 849 sizeof(struct sadb_address)+sockaddr_size); 850 addr->sadb_address_len = 851 (sizeof(struct sadb_address)+sockaddr_size)/ 852 sizeof(uint64_t); 853 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 854 addr->sadb_address_proto = 855 pfkey_proto_from_xfrm(x->sel.proto); 856 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 857 addr->sadb_address_reserved = 0; 858 859 sin = (struct sockaddr_in *) (addr + 1); 860 sin->sin_family = AF_INET; 861 sin->sin_addr.s_addr = x->sel.saddr.a4; 862 sin->sin_port = x->sel.sport; 863 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 864 } 865 } 866 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 867 else if (x->props.family == AF_INET6) { 868 addr->sadb_address_prefixlen = 128; 869 870 sin6 = (struct sockaddr_in6 *) (addr + 1); 871 sin6->sin6_family = AF_INET6; 872 sin6->sin6_port = 0; 873 sin6->sin6_flowinfo = 0; 874 memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); 875 sin6->sin6_scope_id = 0; 876 877 if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, 878 sizeof(struct in6_addr))) { 879 addr = (struct sadb_address *) skb_put(skb, 880 sizeof(struct sadb_address)+sockaddr_size); 881 addr->sadb_address_len = 882 (sizeof(struct sadb_address)+sockaddr_size)/ 883 sizeof(uint64_t); 884 addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; 885 addr->sadb_address_proto = 886 pfkey_proto_from_xfrm(x->sel.proto); 887 addr->sadb_address_prefixlen = x->sel.prefixlen_s; 888 addr->sadb_address_reserved = 0; 889 890 sin6 = (struct sockaddr_in6 *) (addr + 1); 891 sin6->sin6_family = AF_INET6; 892 sin6->sin6_port = x->sel.sport; 893 sin6->sin6_flowinfo = 0; 894 memcpy(&sin6->sin6_addr, x->sel.saddr.a6, 895 sizeof(struct in6_addr)); 896 sin6->sin6_scope_id = 0; 897 } 898 } 899 #endif 900 else 901 BUG(); 902 903 /* auth key */ 904 if (add_keys && auth_key_size) { 905 key = (struct sadb_key *) skb_put(skb, 906 sizeof(struct sadb_key)+auth_key_size); 907 key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / 908 sizeof(uint64_t); 909 key->sadb_key_exttype = SADB_EXT_KEY_AUTH; 910 key->sadb_key_bits = x->aalg->alg_key_len; 911 key->sadb_key_reserved = 0; 912 memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); 913 } 914 /* encrypt key */ 915 if (add_keys && encrypt_key_size) { 916 key = (struct sadb_key *) skb_put(skb, 917 sizeof(struct sadb_key)+encrypt_key_size); 918 key->sadb_key_len = (sizeof(struct sadb_key) + 919 encrypt_key_size) / sizeof(uint64_t); 920 key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; 921 key->sadb_key_bits = x->ealg->alg_key_len; 922 key->sadb_key_reserved = 0; 923 memcpy(key + 1, x->ealg->alg_key, 924 (x->ealg->alg_key_len+7)/8); 925 } 926 927 /* sa */ 928 sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); 929 sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); 930 sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 931 sa2->sadb_x_sa2_mode = x->props.mode + 1; 932 sa2->sadb_x_sa2_reserved1 = 0; 933 sa2->sadb_x_sa2_reserved2 = 0; 934 sa2->sadb_x_sa2_sequence = 0; 935 sa2->sadb_x_sa2_reqid = x->props.reqid; 936 937 if (natt && natt->encap_type) { 938 struct sadb_x_nat_t_type *n_type; 939 struct sadb_x_nat_t_port *n_port; 940 941 /* type */ 942 n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); 943 n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); 944 n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 945 n_type->sadb_x_nat_t_type_type = natt->encap_type; 946 n_type->sadb_x_nat_t_type_reserved[0] = 0; 947 n_type->sadb_x_nat_t_type_reserved[1] = 0; 948 n_type->sadb_x_nat_t_type_reserved[2] = 0; 949 950 /* source port */ 951 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 952 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 953 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 954 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 955 n_port->sadb_x_nat_t_port_reserved = 0; 956 957 /* dest port */ 958 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 959 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 960 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 961 n_port->sadb_x_nat_t_port_port = natt->encap_dport; 962 n_port->sadb_x_nat_t_port_reserved = 0; 963 } 964 965 /* security context */ 966 if (xfrm_ctx) { 967 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 968 sizeof(struct sadb_x_sec_ctx) + ctx_size); 969 sec_ctx->sadb_x_sec_len = 970 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 971 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 972 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 973 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 974 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 975 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 976 xfrm_ctx->ctx_len); 977 } 978 979 return skb; 980 } 981 982 static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, 983 void **ext_hdrs) 984 { 985 struct xfrm_state *x; 986 struct sadb_lifetime *lifetime; 987 struct sadb_sa *sa; 988 struct sadb_key *key; 989 struct sadb_x_sec_ctx *sec_ctx; 990 uint16_t proto; 991 int err; 992 993 994 sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; 995 if (!sa || 996 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 997 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 998 return ERR_PTR(-EINVAL); 999 if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && 1000 !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) 1001 return ERR_PTR(-EINVAL); 1002 if (hdr->sadb_msg_satype == SADB_SATYPE_AH && 1003 !ext_hdrs[SADB_EXT_KEY_AUTH-1]) 1004 return ERR_PTR(-EINVAL); 1005 if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != 1006 !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) 1007 return ERR_PTR(-EINVAL); 1008 1009 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1010 if (proto == 0) 1011 return ERR_PTR(-EINVAL); 1012 1013 /* default error is no buffer space */ 1014 err = -ENOBUFS; 1015 1016 /* RFC2367: 1017 1018 Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. 1019 SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not 1020 sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. 1021 Therefore, the sadb_sa_state field of all submitted SAs MUST be 1022 SADB_SASTATE_MATURE and the kernel MUST return an error if this is 1023 not true. 1024 1025 However, KAME setkey always uses SADB_SASTATE_LARVAL. 1026 Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. 1027 */ 1028 if (sa->sadb_sa_auth > SADB_AALG_MAX || 1029 (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && 1030 sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || 1031 sa->sadb_sa_encrypt > SADB_EALG_MAX) 1032 return ERR_PTR(-EINVAL); 1033 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1034 if (key != NULL && 1035 sa->sadb_sa_auth != SADB_X_AALG_NULL && 1036 ((key->sadb_key_bits+7) / 8 == 0 || 1037 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1038 return ERR_PTR(-EINVAL); 1039 key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1040 if (key != NULL && 1041 sa->sadb_sa_encrypt != SADB_EALG_NULL && 1042 ((key->sadb_key_bits+7) / 8 == 0 || 1043 (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) 1044 return ERR_PTR(-EINVAL); 1045 1046 x = xfrm_state_alloc(); 1047 if (x == NULL) 1048 return ERR_PTR(-ENOBUFS); 1049 1050 x->id.proto = proto; 1051 x->id.spi = sa->sadb_sa_spi; 1052 x->props.replay_window = sa->sadb_sa_replay; 1053 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) 1054 x->props.flags |= XFRM_STATE_NOECN; 1055 if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) 1056 x->props.flags |= XFRM_STATE_DECAP_DSCP; 1057 if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC) 1058 x->props.flags |= XFRM_STATE_NOPMTUDISC; 1059 1060 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; 1061 if (lifetime != NULL) { 1062 x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1063 x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1064 x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1065 x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1066 } 1067 lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; 1068 if (lifetime != NULL) { 1069 x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 1070 x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 1071 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 1072 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 1073 } 1074 1075 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 1076 if (sec_ctx != NULL) { 1077 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 1078 1079 if (!uctx) 1080 goto out; 1081 1082 err = security_xfrm_state_alloc(x, uctx); 1083 kfree(uctx); 1084 1085 if (err) 1086 goto out; 1087 } 1088 1089 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; 1090 if (sa->sadb_sa_auth) { 1091 int keysize = 0; 1092 struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); 1093 if (!a) { 1094 err = -ENOSYS; 1095 goto out; 1096 } 1097 if (key) 1098 keysize = (key->sadb_key_bits + 7) / 8; 1099 x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); 1100 if (!x->aalg) 1101 goto out; 1102 strcpy(x->aalg->alg_name, a->name); 1103 x->aalg->alg_key_len = 0; 1104 if (key) { 1105 x->aalg->alg_key_len = key->sadb_key_bits; 1106 memcpy(x->aalg->alg_key, key+1, keysize); 1107 } 1108 x->props.aalgo = sa->sadb_sa_auth; 1109 /* x->algo.flags = sa->sadb_sa_flags; */ 1110 } 1111 if (sa->sadb_sa_encrypt) { 1112 if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { 1113 struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); 1114 if (!a) { 1115 err = -ENOSYS; 1116 goto out; 1117 } 1118 x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); 1119 if (!x->calg) 1120 goto out; 1121 strcpy(x->calg->alg_name, a->name); 1122 x->props.calgo = sa->sadb_sa_encrypt; 1123 } else { 1124 int keysize = 0; 1125 struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); 1126 if (!a) { 1127 err = -ENOSYS; 1128 goto out; 1129 } 1130 key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; 1131 if (key) 1132 keysize = (key->sadb_key_bits + 7) / 8; 1133 x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); 1134 if (!x->ealg) 1135 goto out; 1136 strcpy(x->ealg->alg_name, a->name); 1137 x->ealg->alg_key_len = 0; 1138 if (key) { 1139 x->ealg->alg_key_len = key->sadb_key_bits; 1140 memcpy(x->ealg->alg_key, key+1, keysize); 1141 } 1142 x->props.ealgo = sa->sadb_sa_encrypt; 1143 } 1144 } 1145 /* x->algo.flags = sa->sadb_sa_flags; */ 1146 1147 x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1148 &x->props.saddr); 1149 if (!x->props.family) { 1150 err = -EAFNOSUPPORT; 1151 goto out; 1152 } 1153 pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], 1154 &x->id.daddr); 1155 1156 if (ext_hdrs[SADB_X_EXT_SA2-1]) { 1157 struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; 1158 x->props.mode = sa2->sadb_x_sa2_mode; 1159 if (x->props.mode) 1160 x->props.mode--; 1161 x->props.reqid = sa2->sadb_x_sa2_reqid; 1162 } 1163 1164 if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { 1165 struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; 1166 1167 /* Nobody uses this, but we try. */ 1168 x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); 1169 x->sel.prefixlen_s = addr->sadb_address_prefixlen; 1170 } 1171 1172 if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { 1173 struct sadb_x_nat_t_type* n_type; 1174 struct xfrm_encap_tmpl *natt; 1175 1176 x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); 1177 if (!x->encap) 1178 goto out; 1179 1180 natt = x->encap; 1181 n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; 1182 natt->encap_type = n_type->sadb_x_nat_t_type_type; 1183 1184 if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { 1185 struct sadb_x_nat_t_port* n_port = 1186 ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; 1187 natt->encap_sport = n_port->sadb_x_nat_t_port_port; 1188 } 1189 if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { 1190 struct sadb_x_nat_t_port* n_port = 1191 ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; 1192 natt->encap_dport = n_port->sadb_x_nat_t_port_port; 1193 } 1194 } 1195 1196 err = xfrm_init_state(x); 1197 if (err) 1198 goto out; 1199 1200 x->km.seq = hdr->sadb_msg_seq; 1201 return x; 1202 1203 out: 1204 x->km.state = XFRM_STATE_DEAD; 1205 xfrm_state_put(x); 1206 return ERR_PTR(err); 1207 } 1208 1209 static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1210 { 1211 return -EOPNOTSUPP; 1212 } 1213 1214 static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1215 { 1216 struct sk_buff *resp_skb; 1217 struct sadb_x_sa2 *sa2; 1218 struct sadb_address *saddr, *daddr; 1219 struct sadb_msg *out_hdr; 1220 struct xfrm_state *x = NULL; 1221 u8 mode; 1222 u32 reqid; 1223 u8 proto; 1224 unsigned short family; 1225 xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; 1226 1227 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1228 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1229 return -EINVAL; 1230 1231 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1232 if (proto == 0) 1233 return -EINVAL; 1234 1235 if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { 1236 mode = sa2->sadb_x_sa2_mode - 1; 1237 reqid = sa2->sadb_x_sa2_reqid; 1238 } else { 1239 mode = 0; 1240 reqid = 0; 1241 } 1242 1243 saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; 1244 daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; 1245 1246 family = ((struct sockaddr *)(saddr + 1))->sa_family; 1247 switch (family) { 1248 case AF_INET: 1249 xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; 1250 xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; 1251 break; 1252 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1253 case AF_INET6: 1254 xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; 1255 xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; 1256 break; 1257 #endif 1258 } 1259 1260 if (hdr->sadb_msg_seq) { 1261 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1262 if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { 1263 xfrm_state_put(x); 1264 x = NULL; 1265 } 1266 } 1267 1268 if (!x) 1269 x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); 1270 1271 if (x == NULL) 1272 return -ENOENT; 1273 1274 resp_skb = ERR_PTR(-ENOENT); 1275 1276 spin_lock_bh(&x->lock); 1277 if (x->km.state != XFRM_STATE_DEAD) { 1278 struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; 1279 u32 min_spi, max_spi; 1280 1281 if (range != NULL) { 1282 min_spi = range->sadb_spirange_min; 1283 max_spi = range->sadb_spirange_max; 1284 } else { 1285 min_spi = 0x100; 1286 max_spi = 0x0fffffff; 1287 } 1288 xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); 1289 if (x->id.spi) 1290 resp_skb = pfkey_xfrm_state2msg(x, 0, 3); 1291 } 1292 spin_unlock_bh(&x->lock); 1293 1294 if (IS_ERR(resp_skb)) { 1295 xfrm_state_put(x); 1296 return PTR_ERR(resp_skb); 1297 } 1298 1299 out_hdr = (struct sadb_msg *) resp_skb->data; 1300 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1301 out_hdr->sadb_msg_type = SADB_GETSPI; 1302 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1303 out_hdr->sadb_msg_errno = 0; 1304 out_hdr->sadb_msg_reserved = 0; 1305 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1306 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1307 1308 xfrm_state_put(x); 1309 1310 pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); 1311 1312 return 0; 1313 } 1314 1315 static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1316 { 1317 struct xfrm_state *x; 1318 1319 if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) 1320 return -EOPNOTSUPP; 1321 1322 if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) 1323 return 0; 1324 1325 x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); 1326 if (x == NULL) 1327 return 0; 1328 1329 spin_lock_bh(&x->lock); 1330 if (x->km.state == XFRM_STATE_ACQ) { 1331 x->km.state = XFRM_STATE_ERROR; 1332 wake_up(&km_waitq); 1333 } 1334 spin_unlock_bh(&x->lock); 1335 xfrm_state_put(x); 1336 return 0; 1337 } 1338 1339 static inline int event2poltype(int event) 1340 { 1341 switch (event) { 1342 case XFRM_MSG_DELPOLICY: 1343 return SADB_X_SPDDELETE; 1344 case XFRM_MSG_NEWPOLICY: 1345 return SADB_X_SPDADD; 1346 case XFRM_MSG_UPDPOLICY: 1347 return SADB_X_SPDUPDATE; 1348 case XFRM_MSG_POLEXPIRE: 1349 // return SADB_X_SPDEXPIRE; 1350 default: 1351 printk("pfkey: Unknown policy event %d\n", event); 1352 break; 1353 } 1354 1355 return 0; 1356 } 1357 1358 static inline int event2keytype(int event) 1359 { 1360 switch (event) { 1361 case XFRM_MSG_DELSA: 1362 return SADB_DELETE; 1363 case XFRM_MSG_NEWSA: 1364 return SADB_ADD; 1365 case XFRM_MSG_UPDSA: 1366 return SADB_UPDATE; 1367 case XFRM_MSG_EXPIRE: 1368 return SADB_EXPIRE; 1369 default: 1370 printk("pfkey: Unknown SA event %d\n", event); 1371 break; 1372 } 1373 1374 return 0; 1375 } 1376 1377 /* ADD/UPD/DEL */ 1378 static int key_notify_sa(struct xfrm_state *x, struct km_event *c) 1379 { 1380 struct sk_buff *skb; 1381 struct sadb_msg *hdr; 1382 int hsc = 3; 1383 1384 if (c->event == XFRM_MSG_DELSA) 1385 hsc = 0; 1386 1387 skb = pfkey_xfrm_state2msg(x, 0, hsc); 1388 1389 if (IS_ERR(skb)) 1390 return PTR_ERR(skb); 1391 1392 hdr = (struct sadb_msg *) skb->data; 1393 hdr->sadb_msg_version = PF_KEY_V2; 1394 hdr->sadb_msg_type = event2keytype(c->event); 1395 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1396 hdr->sadb_msg_errno = 0; 1397 hdr->sadb_msg_reserved = 0; 1398 hdr->sadb_msg_seq = c->seq; 1399 hdr->sadb_msg_pid = c->pid; 1400 1401 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1402 1403 return 0; 1404 } 1405 1406 static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1407 { 1408 struct xfrm_state *x; 1409 int err; 1410 struct km_event c; 1411 1412 xfrm_probe_algs(); 1413 1414 x = pfkey_msg2xfrm_state(hdr, ext_hdrs); 1415 if (IS_ERR(x)) 1416 return PTR_ERR(x); 1417 1418 xfrm_state_hold(x); 1419 if (hdr->sadb_msg_type == SADB_ADD) 1420 err = xfrm_state_add(x); 1421 else 1422 err = xfrm_state_update(x); 1423 1424 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 1425 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x); 1426 1427 if (err < 0) { 1428 x->km.state = XFRM_STATE_DEAD; 1429 __xfrm_state_put(x); 1430 goto out; 1431 } 1432 1433 if (hdr->sadb_msg_type == SADB_ADD) 1434 c.event = XFRM_MSG_NEWSA; 1435 else 1436 c.event = XFRM_MSG_UPDSA; 1437 c.seq = hdr->sadb_msg_seq; 1438 c.pid = hdr->sadb_msg_pid; 1439 km_state_notify(x, &c); 1440 out: 1441 xfrm_state_put(x); 1442 return err; 1443 } 1444 1445 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1446 { 1447 struct xfrm_state *x; 1448 struct km_event c; 1449 int err; 1450 1451 if (!ext_hdrs[SADB_EXT_SA-1] || 1452 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1453 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1454 return -EINVAL; 1455 1456 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1457 if (x == NULL) 1458 return -ESRCH; 1459 1460 if ((err = security_xfrm_state_delete(x))) 1461 goto out; 1462 1463 if (xfrm_state_kern(x)) { 1464 err = -EPERM; 1465 goto out; 1466 } 1467 1468 err = xfrm_state_delete(x); 1469 1470 if (err < 0) 1471 goto out; 1472 1473 c.seq = hdr->sadb_msg_seq; 1474 c.pid = hdr->sadb_msg_pid; 1475 c.event = XFRM_MSG_DELSA; 1476 km_state_notify(x, &c); 1477 out: 1478 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 1479 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x); 1480 xfrm_state_put(x); 1481 1482 return err; 1483 } 1484 1485 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1486 { 1487 __u8 proto; 1488 struct sk_buff *out_skb; 1489 struct sadb_msg *out_hdr; 1490 struct xfrm_state *x; 1491 1492 if (!ext_hdrs[SADB_EXT_SA-1] || 1493 !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 1494 ext_hdrs[SADB_EXT_ADDRESS_DST-1])) 1495 return -EINVAL; 1496 1497 x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); 1498 if (x == NULL) 1499 return -ESRCH; 1500 1501 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1502 proto = x->id.proto; 1503 xfrm_state_put(x); 1504 if (IS_ERR(out_skb)) 1505 return PTR_ERR(out_skb); 1506 1507 out_hdr = (struct sadb_msg *) out_skb->data; 1508 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 1509 out_hdr->sadb_msg_type = SADB_DUMP; 1510 out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); 1511 out_hdr->sadb_msg_errno = 0; 1512 out_hdr->sadb_msg_reserved = 0; 1513 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 1514 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 1515 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 1516 1517 return 0; 1518 } 1519 1520 static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, 1521 gfp_t allocation) 1522 { 1523 struct sk_buff *skb; 1524 struct sadb_msg *hdr; 1525 int len, auth_len, enc_len, i; 1526 1527 auth_len = xfrm_count_auth_supported(); 1528 if (auth_len) { 1529 auth_len *= sizeof(struct sadb_alg); 1530 auth_len += sizeof(struct sadb_supported); 1531 } 1532 1533 enc_len = xfrm_count_enc_supported(); 1534 if (enc_len) { 1535 enc_len *= sizeof(struct sadb_alg); 1536 enc_len += sizeof(struct sadb_supported); 1537 } 1538 1539 len = enc_len + auth_len + sizeof(struct sadb_msg); 1540 1541 skb = alloc_skb(len + 16, allocation); 1542 if (!skb) 1543 goto out_put_algs; 1544 1545 hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); 1546 pfkey_hdr_dup(hdr, orig); 1547 hdr->sadb_msg_errno = 0; 1548 hdr->sadb_msg_len = len / sizeof(uint64_t); 1549 1550 if (auth_len) { 1551 struct sadb_supported *sp; 1552 struct sadb_alg *ap; 1553 1554 sp = (struct sadb_supported *) skb_put(skb, auth_len); 1555 ap = (struct sadb_alg *) (sp + 1); 1556 1557 sp->sadb_supported_len = auth_len / sizeof(uint64_t); 1558 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 1559 1560 for (i = 0; ; i++) { 1561 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 1562 if (!aalg) 1563 break; 1564 if (aalg->available) 1565 *ap++ = aalg->desc; 1566 } 1567 } 1568 1569 if (enc_len) { 1570 struct sadb_supported *sp; 1571 struct sadb_alg *ap; 1572 1573 sp = (struct sadb_supported *) skb_put(skb, enc_len); 1574 ap = (struct sadb_alg *) (sp + 1); 1575 1576 sp->sadb_supported_len = enc_len / sizeof(uint64_t); 1577 sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 1578 1579 for (i = 0; ; i++) { 1580 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 1581 if (!ealg) 1582 break; 1583 if (ealg->available) 1584 *ap++ = ealg->desc; 1585 } 1586 } 1587 1588 out_put_algs: 1589 return skb; 1590 } 1591 1592 static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1593 { 1594 struct pfkey_sock *pfk = pfkey_sk(sk); 1595 struct sk_buff *supp_skb; 1596 1597 if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) 1598 return -EINVAL; 1599 1600 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { 1601 if (pfk->registered&(1<<hdr->sadb_msg_satype)) 1602 return -EEXIST; 1603 pfk->registered |= (1<<hdr->sadb_msg_satype); 1604 } 1605 1606 xfrm_probe_algs(); 1607 1608 supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); 1609 if (!supp_skb) { 1610 if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) 1611 pfk->registered &= ~(1<<hdr->sadb_msg_satype); 1612 1613 return -ENOBUFS; 1614 } 1615 1616 pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); 1617 1618 return 0; 1619 } 1620 1621 static int key_notify_sa_flush(struct km_event *c) 1622 { 1623 struct sk_buff *skb; 1624 struct sadb_msg *hdr; 1625 1626 skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 1627 if (!skb) 1628 return -ENOBUFS; 1629 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1630 hdr->sadb_msg_satype = pfkey_proto2satype(c->data.proto); 1631 hdr->sadb_msg_type = SADB_FLUSH; 1632 hdr->sadb_msg_seq = c->seq; 1633 hdr->sadb_msg_pid = c->pid; 1634 hdr->sadb_msg_version = PF_KEY_V2; 1635 hdr->sadb_msg_errno = (uint8_t) 0; 1636 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 1637 1638 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 1639 1640 return 0; 1641 } 1642 1643 static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1644 { 1645 unsigned proto; 1646 struct km_event c; 1647 struct xfrm_audit audit_info; 1648 1649 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1650 if (proto == 0) 1651 return -EINVAL; 1652 1653 audit_info.loginuid = audit_get_loginuid(current->audit_context); 1654 audit_info.secid = 0; 1655 xfrm_state_flush(proto, &audit_info); 1656 c.data.proto = proto; 1657 c.seq = hdr->sadb_msg_seq; 1658 c.pid = hdr->sadb_msg_pid; 1659 c.event = XFRM_MSG_FLUSHSA; 1660 km_state_notify(NULL, &c); 1661 1662 return 0; 1663 } 1664 1665 struct pfkey_dump_data 1666 { 1667 struct sk_buff *skb; 1668 struct sadb_msg *hdr; 1669 struct sock *sk; 1670 }; 1671 1672 static int dump_sa(struct xfrm_state *x, int count, void *ptr) 1673 { 1674 struct pfkey_dump_data *data = ptr; 1675 struct sk_buff *out_skb; 1676 struct sadb_msg *out_hdr; 1677 1678 out_skb = pfkey_xfrm_state2msg(x, 1, 3); 1679 if (IS_ERR(out_skb)) 1680 return PTR_ERR(out_skb); 1681 1682 out_hdr = (struct sadb_msg *) out_skb->data; 1683 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 1684 out_hdr->sadb_msg_type = SADB_DUMP; 1685 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 1686 out_hdr->sadb_msg_errno = 0; 1687 out_hdr->sadb_msg_reserved = 0; 1688 out_hdr->sadb_msg_seq = count; 1689 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 1690 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 1691 return 0; 1692 } 1693 1694 static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1695 { 1696 u8 proto; 1697 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 1698 1699 proto = pfkey_satype2proto(hdr->sadb_msg_satype); 1700 if (proto == 0) 1701 return -EINVAL; 1702 1703 return xfrm_state_walk(proto, dump_sa, &data); 1704 } 1705 1706 static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 1707 { 1708 struct pfkey_sock *pfk = pfkey_sk(sk); 1709 int satype = hdr->sadb_msg_satype; 1710 1711 if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { 1712 /* XXX we mangle packet... */ 1713 hdr->sadb_msg_errno = 0; 1714 if (satype != 0 && satype != 1) 1715 return -EINVAL; 1716 pfk->promisc = satype; 1717 } 1718 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); 1719 return 0; 1720 } 1721 1722 static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) 1723 { 1724 int i; 1725 u32 reqid = *(u32*)ptr; 1726 1727 for (i=0; i<xp->xfrm_nr; i++) { 1728 if (xp->xfrm_vec[i].reqid == reqid) 1729 return -EEXIST; 1730 } 1731 return 0; 1732 } 1733 1734 static u32 gen_reqid(void) 1735 { 1736 u32 start; 1737 static u32 reqid = IPSEC_MANUAL_REQID_MAX; 1738 1739 start = reqid; 1740 do { 1741 ++reqid; 1742 if (reqid == 0) 1743 reqid = IPSEC_MANUAL_REQID_MAX+1; 1744 if (xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, check_reqid, 1745 (void*)&reqid) != -EEXIST) 1746 return reqid; 1747 } while (reqid != start); 1748 return 0; 1749 } 1750 1751 static int 1752 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) 1753 { 1754 struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; 1755 struct sockaddr_in *sin; 1756 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1757 struct sockaddr_in6 *sin6; 1758 #endif 1759 1760 if (xp->xfrm_nr >= XFRM_MAX_DEPTH) 1761 return -ELOOP; 1762 1763 if (rq->sadb_x_ipsecrequest_mode == 0) 1764 return -EINVAL; 1765 1766 t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ 1767 t->mode = rq->sadb_x_ipsecrequest_mode-1; 1768 if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) 1769 t->optional = 1; 1770 else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { 1771 t->reqid = rq->sadb_x_ipsecrequest_reqid; 1772 if (t->reqid > IPSEC_MANUAL_REQID_MAX) 1773 t->reqid = 0; 1774 if (!t->reqid && !(t->reqid = gen_reqid())) 1775 return -ENOBUFS; 1776 } 1777 1778 /* addresses present only in tunnel mode */ 1779 if (t->mode == XFRM_MODE_TUNNEL) { 1780 struct sockaddr *sa; 1781 sa = (struct sockaddr *)(rq+1); 1782 switch(sa->sa_family) { 1783 case AF_INET: 1784 sin = (struct sockaddr_in*)sa; 1785 t->saddr.a4 = sin->sin_addr.s_addr; 1786 sin++; 1787 if (sin->sin_family != AF_INET) 1788 return -EINVAL; 1789 t->id.daddr.a4 = sin->sin_addr.s_addr; 1790 break; 1791 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1792 case AF_INET6: 1793 sin6 = (struct sockaddr_in6*)sa; 1794 memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1795 sin6++; 1796 if (sin6->sin6_family != AF_INET6) 1797 return -EINVAL; 1798 memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); 1799 break; 1800 #endif 1801 default: 1802 return -EINVAL; 1803 } 1804 t->encap_family = sa->sa_family; 1805 } else 1806 t->encap_family = xp->family; 1807 1808 /* No way to set this via kame pfkey */ 1809 t->aalgos = t->ealgos = t->calgos = ~0; 1810 xp->xfrm_nr++; 1811 return 0; 1812 } 1813 1814 static int 1815 parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) 1816 { 1817 int err; 1818 int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); 1819 struct sadb_x_ipsecrequest *rq = (void*)(pol+1); 1820 1821 while (len >= sizeof(struct sadb_x_ipsecrequest)) { 1822 if ((err = parse_ipsecrequest(xp, rq)) < 0) 1823 return err; 1824 len -= rq->sadb_x_ipsecrequest_len; 1825 rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); 1826 } 1827 return 0; 1828 } 1829 1830 static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp) 1831 { 1832 struct xfrm_sec_ctx *xfrm_ctx = xp->security; 1833 1834 if (xfrm_ctx) { 1835 int len = sizeof(struct sadb_x_sec_ctx); 1836 len += xfrm_ctx->ctx_len; 1837 return PFKEY_ALIGN8(len); 1838 } 1839 return 0; 1840 } 1841 1842 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) 1843 { 1844 struct xfrm_tmpl *t; 1845 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1846 int socklen = 0; 1847 int i; 1848 1849 for (i=0; i<xp->xfrm_nr; i++) { 1850 t = xp->xfrm_vec + i; 1851 socklen += (t->encap_family == AF_INET ? 1852 sizeof(struct sockaddr_in) : 1853 sizeof(struct sockaddr_in6)); 1854 } 1855 1856 return sizeof(struct sadb_msg) + 1857 (sizeof(struct sadb_lifetime) * 3) + 1858 (sizeof(struct sadb_address) * 2) + 1859 (sockaddr_size * 2) + 1860 sizeof(struct sadb_x_policy) + 1861 (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) + 1862 (socklen * 2) + 1863 pfkey_xfrm_policy2sec_ctx_size(xp); 1864 } 1865 1866 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) 1867 { 1868 struct sk_buff *skb; 1869 int size; 1870 1871 size = pfkey_xfrm_policy2msg_size(xp); 1872 1873 skb = alloc_skb(size + 16, GFP_ATOMIC); 1874 if (skb == NULL) 1875 return ERR_PTR(-ENOBUFS); 1876 1877 return skb; 1878 } 1879 1880 static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) 1881 { 1882 struct sadb_msg *hdr; 1883 struct sadb_address *addr; 1884 struct sadb_lifetime *lifetime; 1885 struct sadb_x_policy *pol; 1886 struct sockaddr_in *sin; 1887 struct sadb_x_sec_ctx *sec_ctx; 1888 struct xfrm_sec_ctx *xfrm_ctx; 1889 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1890 struct sockaddr_in6 *sin6; 1891 #endif 1892 int i; 1893 int size; 1894 int sockaddr_size = pfkey_sockaddr_size(xp->family); 1895 int socklen = (xp->family == AF_INET ? 1896 sizeof(struct sockaddr_in) : 1897 sizeof(struct sockaddr_in6)); 1898 1899 size = pfkey_xfrm_policy2msg_size(xp); 1900 1901 /* call should fill header later */ 1902 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 1903 memset(hdr, 0, size); /* XXX do we need this ? */ 1904 1905 /* src address */ 1906 addr = (struct sadb_address*) skb_put(skb, 1907 sizeof(struct sadb_address)+sockaddr_size); 1908 addr->sadb_address_len = 1909 (sizeof(struct sadb_address)+sockaddr_size)/ 1910 sizeof(uint64_t); 1911 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 1912 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1913 addr->sadb_address_prefixlen = xp->selector.prefixlen_s; 1914 addr->sadb_address_reserved = 0; 1915 /* src address */ 1916 if (xp->family == AF_INET) { 1917 sin = (struct sockaddr_in *) (addr + 1); 1918 sin->sin_family = AF_INET; 1919 sin->sin_addr.s_addr = xp->selector.saddr.a4; 1920 sin->sin_port = xp->selector.sport; 1921 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1922 } 1923 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1924 else if (xp->family == AF_INET6) { 1925 sin6 = (struct sockaddr_in6 *) (addr + 1); 1926 sin6->sin6_family = AF_INET6; 1927 sin6->sin6_port = xp->selector.sport; 1928 sin6->sin6_flowinfo = 0; 1929 memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, 1930 sizeof(struct in6_addr)); 1931 sin6->sin6_scope_id = 0; 1932 } 1933 #endif 1934 else 1935 BUG(); 1936 1937 /* dst address */ 1938 addr = (struct sadb_address*) skb_put(skb, 1939 sizeof(struct sadb_address)+sockaddr_size); 1940 addr->sadb_address_len = 1941 (sizeof(struct sadb_address)+sockaddr_size)/ 1942 sizeof(uint64_t); 1943 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 1944 addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); 1945 addr->sadb_address_prefixlen = xp->selector.prefixlen_d; 1946 addr->sadb_address_reserved = 0; 1947 if (xp->family == AF_INET) { 1948 sin = (struct sockaddr_in *) (addr + 1); 1949 sin->sin_family = AF_INET; 1950 sin->sin_addr.s_addr = xp->selector.daddr.a4; 1951 sin->sin_port = xp->selector.dport; 1952 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 1953 } 1954 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 1955 else if (xp->family == AF_INET6) { 1956 sin6 = (struct sockaddr_in6 *) (addr + 1); 1957 sin6->sin6_family = AF_INET6; 1958 sin6->sin6_port = xp->selector.dport; 1959 sin6->sin6_flowinfo = 0; 1960 memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, 1961 sizeof(struct in6_addr)); 1962 sin6->sin6_scope_id = 0; 1963 } 1964 #endif 1965 else 1966 BUG(); 1967 1968 /* hard 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_HARD; 1974 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); 1975 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); 1976 lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; 1977 lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; 1978 /* soft time */ 1979 lifetime = (struct sadb_lifetime *) skb_put(skb, 1980 sizeof(struct sadb_lifetime)); 1981 lifetime->sadb_lifetime_len = 1982 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1983 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 1984 lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); 1985 lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); 1986 lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; 1987 lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; 1988 /* current time */ 1989 lifetime = (struct sadb_lifetime *) skb_put(skb, 1990 sizeof(struct sadb_lifetime)); 1991 lifetime->sadb_lifetime_len = 1992 sizeof(struct sadb_lifetime)/sizeof(uint64_t); 1993 lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 1994 lifetime->sadb_lifetime_allocations = xp->curlft.packets; 1995 lifetime->sadb_lifetime_bytes = xp->curlft.bytes; 1996 lifetime->sadb_lifetime_addtime = xp->curlft.add_time; 1997 lifetime->sadb_lifetime_usetime = xp->curlft.use_time; 1998 1999 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 2000 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 2001 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 2002 pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; 2003 if (xp->action == XFRM_POLICY_ALLOW) { 2004 if (xp->xfrm_nr) 2005 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 2006 else 2007 pol->sadb_x_policy_type = IPSEC_POLICY_NONE; 2008 } 2009 pol->sadb_x_policy_dir = dir+1; 2010 pol->sadb_x_policy_id = xp->index; 2011 pol->sadb_x_policy_priority = xp->priority; 2012 2013 for (i=0; i<xp->xfrm_nr; i++) { 2014 struct sadb_x_ipsecrequest *rq; 2015 struct xfrm_tmpl *t = xp->xfrm_vec + i; 2016 int req_size; 2017 2018 req_size = sizeof(struct sadb_x_ipsecrequest); 2019 if (t->mode == XFRM_MODE_TUNNEL) 2020 req_size += ((t->encap_family == AF_INET ? 2021 sizeof(struct sockaddr_in) : 2022 sizeof(struct sockaddr_in6)) * 2); 2023 else 2024 size -= 2*socklen; 2025 rq = (void*)skb_put(skb, req_size); 2026 pol->sadb_x_policy_len += req_size/8; 2027 memset(rq, 0, sizeof(*rq)); 2028 rq->sadb_x_ipsecrequest_len = req_size; 2029 rq->sadb_x_ipsecrequest_proto = t->id.proto; 2030 rq->sadb_x_ipsecrequest_mode = t->mode+1; 2031 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; 2032 if (t->reqid) 2033 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; 2034 if (t->optional) 2035 rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; 2036 rq->sadb_x_ipsecrequest_reqid = t->reqid; 2037 if (t->mode == XFRM_MODE_TUNNEL) { 2038 switch (t->encap_family) { 2039 case AF_INET: 2040 sin = (void*)(rq+1); 2041 sin->sin_family = AF_INET; 2042 sin->sin_addr.s_addr = t->saddr.a4; 2043 sin->sin_port = 0; 2044 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2045 sin++; 2046 sin->sin_family = AF_INET; 2047 sin->sin_addr.s_addr = t->id.daddr.a4; 2048 sin->sin_port = 0; 2049 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2050 break; 2051 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2052 case AF_INET6: 2053 sin6 = (void*)(rq+1); 2054 sin6->sin6_family = AF_INET6; 2055 sin6->sin6_port = 0; 2056 sin6->sin6_flowinfo = 0; 2057 memcpy(&sin6->sin6_addr, t->saddr.a6, 2058 sizeof(struct in6_addr)); 2059 sin6->sin6_scope_id = 0; 2060 2061 sin6++; 2062 sin6->sin6_family = AF_INET6; 2063 sin6->sin6_port = 0; 2064 sin6->sin6_flowinfo = 0; 2065 memcpy(&sin6->sin6_addr, t->id.daddr.a6, 2066 sizeof(struct in6_addr)); 2067 sin6->sin6_scope_id = 0; 2068 break; 2069 #endif 2070 default: 2071 break; 2072 } 2073 } 2074 } 2075 2076 /* security context */ 2077 if ((xfrm_ctx = xp->security)) { 2078 int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp); 2079 2080 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size); 2081 sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t); 2082 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 2083 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 2084 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 2085 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 2086 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 2087 xfrm_ctx->ctx_len); 2088 } 2089 2090 hdr->sadb_msg_len = size / sizeof(uint64_t); 2091 hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); 2092 } 2093 2094 static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c) 2095 { 2096 struct sk_buff *out_skb; 2097 struct sadb_msg *out_hdr; 2098 int err; 2099 2100 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2101 if (IS_ERR(out_skb)) { 2102 err = PTR_ERR(out_skb); 2103 goto out; 2104 } 2105 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2106 2107 out_hdr = (struct sadb_msg *) out_skb->data; 2108 out_hdr->sadb_msg_version = PF_KEY_V2; 2109 2110 if (c->data.byid && c->event == XFRM_MSG_DELPOLICY) 2111 out_hdr->sadb_msg_type = SADB_X_SPDDELETE2; 2112 else 2113 out_hdr->sadb_msg_type = event2poltype(c->event); 2114 out_hdr->sadb_msg_errno = 0; 2115 out_hdr->sadb_msg_seq = c->seq; 2116 out_hdr->sadb_msg_pid = c->pid; 2117 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 2118 out: 2119 return 0; 2120 2121 } 2122 2123 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2124 { 2125 int err = 0; 2126 struct sadb_lifetime *lifetime; 2127 struct sadb_address *sa; 2128 struct sadb_x_policy *pol; 2129 struct xfrm_policy *xp; 2130 struct km_event c; 2131 struct sadb_x_sec_ctx *sec_ctx; 2132 2133 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2134 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2135 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2136 return -EINVAL; 2137 2138 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2139 if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) 2140 return -EINVAL; 2141 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2142 return -EINVAL; 2143 2144 xp = xfrm_policy_alloc(GFP_KERNEL); 2145 if (xp == NULL) 2146 return -ENOBUFS; 2147 2148 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 2149 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 2150 xp->priority = pol->sadb_x_policy_priority; 2151 2152 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2153 xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); 2154 if (!xp->family) { 2155 err = -EINVAL; 2156 goto out; 2157 } 2158 xp->selector.family = xp->family; 2159 xp->selector.prefixlen_s = sa->sadb_address_prefixlen; 2160 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2161 xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2162 if (xp->selector.sport) 2163 xp->selector.sport_mask = htons(0xffff); 2164 2165 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2166 pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); 2167 xp->selector.prefixlen_d = sa->sadb_address_prefixlen; 2168 2169 /* Amusing, we set this twice. KAME apps appear to set same value 2170 * in both addresses. 2171 */ 2172 xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2173 2174 xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2175 if (xp->selector.dport) 2176 xp->selector.dport_mask = htons(0xffff); 2177 2178 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2179 if (sec_ctx != NULL) { 2180 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2181 2182 if (!uctx) { 2183 err = -ENOBUFS; 2184 goto out; 2185 } 2186 2187 err = security_xfrm_policy_alloc(xp, uctx); 2188 kfree(uctx); 2189 2190 if (err) 2191 goto out; 2192 } 2193 2194 xp->lft.soft_byte_limit = XFRM_INF; 2195 xp->lft.hard_byte_limit = XFRM_INF; 2196 xp->lft.soft_packet_limit = XFRM_INF; 2197 xp->lft.hard_packet_limit = XFRM_INF; 2198 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { 2199 xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2200 xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2201 xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2202 xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2203 } 2204 if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { 2205 xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); 2206 xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); 2207 xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; 2208 xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; 2209 } 2210 xp->xfrm_nr = 0; 2211 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 2212 (err = parse_ipsecrequests(xp, pol)) < 0) 2213 goto out; 2214 2215 err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, 2216 hdr->sadb_msg_type != SADB_X_SPDUPDATE); 2217 2218 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 2219 AUDIT_MAC_IPSEC_ADDSPD, err ? 0 : 1, xp, NULL); 2220 2221 if (err) 2222 goto out; 2223 2224 if (hdr->sadb_msg_type == SADB_X_SPDUPDATE) 2225 c.event = XFRM_MSG_UPDPOLICY; 2226 else 2227 c.event = XFRM_MSG_NEWPOLICY; 2228 2229 c.seq = hdr->sadb_msg_seq; 2230 c.pid = hdr->sadb_msg_pid; 2231 2232 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2233 xfrm_pol_put(xp); 2234 return 0; 2235 2236 out: 2237 security_xfrm_policy_free(xp); 2238 kfree(xp); 2239 return err; 2240 } 2241 2242 static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2243 { 2244 int err; 2245 struct sadb_address *sa; 2246 struct sadb_x_policy *pol; 2247 struct xfrm_policy *xp, tmp; 2248 struct xfrm_selector sel; 2249 struct km_event c; 2250 struct sadb_x_sec_ctx *sec_ctx; 2251 2252 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2253 ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || 2254 !ext_hdrs[SADB_X_EXT_POLICY-1]) 2255 return -EINVAL; 2256 2257 pol = ext_hdrs[SADB_X_EXT_POLICY-1]; 2258 if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) 2259 return -EINVAL; 2260 2261 memset(&sel, 0, sizeof(sel)); 2262 2263 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], 2264 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2265 sel.prefixlen_s = sa->sadb_address_prefixlen; 2266 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2267 sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; 2268 if (sel.sport) 2269 sel.sport_mask = htons(0xffff); 2270 2271 sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], 2272 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2273 sel.prefixlen_d = sa->sadb_address_prefixlen; 2274 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2275 sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; 2276 if (sel.dport) 2277 sel.dport_mask = htons(0xffff); 2278 2279 sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1]; 2280 memset(&tmp, 0, sizeof(struct xfrm_policy)); 2281 2282 if (sec_ctx != NULL) { 2283 struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 2284 2285 if (!uctx) 2286 return -ENOMEM; 2287 2288 err = security_xfrm_policy_alloc(&tmp, uctx); 2289 kfree(uctx); 2290 2291 if (err) 2292 return err; 2293 } 2294 2295 xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN, pol->sadb_x_policy_dir-1, 2296 &sel, tmp.security, 1, &err); 2297 security_xfrm_policy_free(&tmp); 2298 2299 if (xp == NULL) 2300 return -ENOENT; 2301 2302 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 2303 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL); 2304 2305 if (err) 2306 goto out; 2307 2308 c.seq = hdr->sadb_msg_seq; 2309 c.pid = hdr->sadb_msg_pid; 2310 c.event = XFRM_MSG_DELPOLICY; 2311 km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c); 2312 2313 out: 2314 xfrm_pol_put(xp); 2315 return err; 2316 } 2317 2318 static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir) 2319 { 2320 int err; 2321 struct sk_buff *out_skb; 2322 struct sadb_msg *out_hdr; 2323 err = 0; 2324 2325 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2326 if (IS_ERR(out_skb)) { 2327 err = PTR_ERR(out_skb); 2328 goto out; 2329 } 2330 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2331 2332 out_hdr = (struct sadb_msg *) out_skb->data; 2333 out_hdr->sadb_msg_version = hdr->sadb_msg_version; 2334 out_hdr->sadb_msg_type = hdr->sadb_msg_type; 2335 out_hdr->sadb_msg_satype = 0; 2336 out_hdr->sadb_msg_errno = 0; 2337 out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; 2338 out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; 2339 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); 2340 err = 0; 2341 2342 out: 2343 return err; 2344 } 2345 2346 #ifdef CONFIG_NET_KEY_MIGRATE 2347 static int pfkey_sockaddr_pair_size(sa_family_t family) 2348 { 2349 switch (family) { 2350 case AF_INET: 2351 return PFKEY_ALIGN8(sizeof(struct sockaddr_in) * 2); 2352 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2353 case AF_INET6: 2354 return PFKEY_ALIGN8(sizeof(struct sockaddr_in6) * 2); 2355 #endif 2356 default: 2357 return 0; 2358 } 2359 /* NOTREACHED */ 2360 } 2361 2362 static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq, 2363 xfrm_address_t *saddr, xfrm_address_t *daddr, 2364 u16 *family) 2365 { 2366 struct sockaddr *sa = (struct sockaddr *)(rq + 1); 2367 if (rq->sadb_x_ipsecrequest_len < 2368 pfkey_sockaddr_pair_size(sa->sa_family)) 2369 return -EINVAL; 2370 2371 switch (sa->sa_family) { 2372 case AF_INET: 2373 { 2374 struct sockaddr_in *sin; 2375 sin = (struct sockaddr_in *)sa; 2376 if ((sin+1)->sin_family != AF_INET) 2377 return -EINVAL; 2378 memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4)); 2379 sin++; 2380 memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4)); 2381 *family = AF_INET; 2382 break; 2383 } 2384 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2385 case AF_INET6: 2386 { 2387 struct sockaddr_in6 *sin6; 2388 sin6 = (struct sockaddr_in6 *)sa; 2389 if ((sin6+1)->sin6_family != AF_INET6) 2390 return -EINVAL; 2391 memcpy(&saddr->a6, &sin6->sin6_addr, 2392 sizeof(saddr->a6)); 2393 sin6++; 2394 memcpy(&daddr->a6, &sin6->sin6_addr, 2395 sizeof(daddr->a6)); 2396 *family = AF_INET6; 2397 break; 2398 } 2399 #endif 2400 default: 2401 return -EINVAL; 2402 } 2403 2404 return 0; 2405 } 2406 2407 static int ipsecrequests_to_migrate(struct sadb_x_ipsecrequest *rq1, int len, 2408 struct xfrm_migrate *m) 2409 { 2410 int err; 2411 struct sadb_x_ipsecrequest *rq2; 2412 2413 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2414 len < rq1->sadb_x_ipsecrequest_len) 2415 return -EINVAL; 2416 2417 /* old endoints */ 2418 err = parse_sockaddr_pair(rq1, &m->old_saddr, &m->old_daddr, 2419 &m->old_family); 2420 if (err) 2421 return err; 2422 2423 rq2 = (struct sadb_x_ipsecrequest *)((u8 *)rq1 + rq1->sadb_x_ipsecrequest_len); 2424 len -= rq1->sadb_x_ipsecrequest_len; 2425 2426 if (len <= sizeof(struct sadb_x_ipsecrequest) || 2427 len < rq2->sadb_x_ipsecrequest_len) 2428 return -EINVAL; 2429 2430 /* new endpoints */ 2431 err = parse_sockaddr_pair(rq2, &m->new_saddr, &m->new_daddr, 2432 &m->new_family); 2433 if (err) 2434 return err; 2435 2436 if (rq1->sadb_x_ipsecrequest_proto != rq2->sadb_x_ipsecrequest_proto || 2437 rq1->sadb_x_ipsecrequest_mode != rq2->sadb_x_ipsecrequest_mode || 2438 rq1->sadb_x_ipsecrequest_reqid != rq2->sadb_x_ipsecrequest_reqid) 2439 return -EINVAL; 2440 2441 m->proto = rq1->sadb_x_ipsecrequest_proto; 2442 m->mode = rq1->sadb_x_ipsecrequest_mode - 1; 2443 m->reqid = rq1->sadb_x_ipsecrequest_reqid; 2444 2445 return ((int)(rq1->sadb_x_ipsecrequest_len + 2446 rq2->sadb_x_ipsecrequest_len)); 2447 } 2448 2449 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2450 struct sadb_msg *hdr, void **ext_hdrs) 2451 { 2452 int i, len, ret, err = -EINVAL; 2453 u8 dir; 2454 struct sadb_address *sa; 2455 struct sadb_x_policy *pol; 2456 struct sadb_x_ipsecrequest *rq; 2457 struct xfrm_selector sel; 2458 struct xfrm_migrate m[XFRM_MAX_DEPTH]; 2459 2460 if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC - 1], 2461 ext_hdrs[SADB_EXT_ADDRESS_DST - 1]) || 2462 !ext_hdrs[SADB_X_EXT_POLICY - 1]) { 2463 err = -EINVAL; 2464 goto out; 2465 } 2466 2467 pol = ext_hdrs[SADB_X_EXT_POLICY - 1]; 2468 if (!pol) { 2469 err = -EINVAL; 2470 goto out; 2471 } 2472 2473 if (pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) { 2474 err = -EINVAL; 2475 goto out; 2476 } 2477 2478 dir = pol->sadb_x_policy_dir - 1; 2479 memset(&sel, 0, sizeof(sel)); 2480 2481 /* set source address info of selector */ 2482 sa = ext_hdrs[SADB_EXT_ADDRESS_SRC - 1]; 2483 sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); 2484 sel.prefixlen_s = sa->sadb_address_prefixlen; 2485 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2486 sel.sport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2487 if (sel.sport) 2488 sel.sport_mask = ~0; 2489 2490 /* set destination address info of selector */ 2491 sa = ext_hdrs[SADB_EXT_ADDRESS_DST - 1], 2492 pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); 2493 sel.prefixlen_d = sa->sadb_address_prefixlen; 2494 sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); 2495 sel.dport = ((struct sockaddr_in *)(sa + 1))->sin_port; 2496 if (sel.dport) 2497 sel.dport_mask = ~0; 2498 2499 rq = (struct sadb_x_ipsecrequest *)(pol + 1); 2500 2501 /* extract ipsecrequests */ 2502 i = 0; 2503 len = pol->sadb_x_policy_len * 8 - sizeof(struct sadb_x_policy); 2504 2505 while (len > 0 && i < XFRM_MAX_DEPTH) { 2506 ret = ipsecrequests_to_migrate(rq, len, &m[i]); 2507 if (ret < 0) { 2508 err = ret; 2509 goto out; 2510 } else { 2511 rq = (struct sadb_x_ipsecrequest *)((u8 *)rq + ret); 2512 len -= ret; 2513 i++; 2514 } 2515 } 2516 2517 if (!i || len > 0) { 2518 err = -EINVAL; 2519 goto out; 2520 } 2521 2522 return xfrm_migrate(&sel, dir, XFRM_POLICY_TYPE_MAIN, m, i); 2523 2524 out: 2525 return err; 2526 } 2527 #else 2528 static int pfkey_migrate(struct sock *sk, struct sk_buff *skb, 2529 struct sadb_msg *hdr, void **ext_hdrs) 2530 { 2531 return -ENOPROTOOPT; 2532 } 2533 #endif 2534 2535 2536 static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2537 { 2538 unsigned int dir; 2539 int err = 0, delete; 2540 struct sadb_x_policy *pol; 2541 struct xfrm_policy *xp; 2542 struct km_event c; 2543 2544 if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) 2545 return -EINVAL; 2546 2547 dir = xfrm_policy_id2dir(pol->sadb_x_policy_id); 2548 if (dir >= XFRM_POLICY_MAX) 2549 return -EINVAL; 2550 2551 delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2); 2552 xp = xfrm_policy_byid(XFRM_POLICY_TYPE_MAIN, dir, pol->sadb_x_policy_id, 2553 delete, &err); 2554 if (xp == NULL) 2555 return -ENOENT; 2556 2557 if (delete) { 2558 xfrm_audit_log(audit_get_loginuid(current->audit_context), 0, 2559 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL); 2560 2561 if (err) 2562 goto out; 2563 c.seq = hdr->sadb_msg_seq; 2564 c.pid = hdr->sadb_msg_pid; 2565 c.data.byid = 1; 2566 c.event = XFRM_MSG_DELPOLICY; 2567 km_policy_notify(xp, dir, &c); 2568 } else { 2569 err = key_pol_get_resp(sk, xp, hdr, dir); 2570 } 2571 2572 out: 2573 xfrm_pol_put(xp); 2574 return err; 2575 } 2576 2577 static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) 2578 { 2579 struct pfkey_dump_data *data = ptr; 2580 struct sk_buff *out_skb; 2581 struct sadb_msg *out_hdr; 2582 2583 out_skb = pfkey_xfrm_policy2msg_prep(xp); 2584 if (IS_ERR(out_skb)) 2585 return PTR_ERR(out_skb); 2586 2587 pfkey_xfrm_policy2msg(out_skb, xp, dir); 2588 2589 out_hdr = (struct sadb_msg *) out_skb->data; 2590 out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; 2591 out_hdr->sadb_msg_type = SADB_X_SPDDUMP; 2592 out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; 2593 out_hdr->sadb_msg_errno = 0; 2594 out_hdr->sadb_msg_seq = count; 2595 out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; 2596 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); 2597 return 0; 2598 } 2599 2600 static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2601 { 2602 struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; 2603 2604 return xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_sp, &data); 2605 } 2606 2607 static int key_notify_policy_flush(struct km_event *c) 2608 { 2609 struct sk_buff *skb_out; 2610 struct sadb_msg *hdr; 2611 2612 skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC); 2613 if (!skb_out) 2614 return -ENOBUFS; 2615 hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); 2616 hdr->sadb_msg_type = SADB_X_SPDFLUSH; 2617 hdr->sadb_msg_seq = c->seq; 2618 hdr->sadb_msg_pid = c->pid; 2619 hdr->sadb_msg_version = PF_KEY_V2; 2620 hdr->sadb_msg_errno = (uint8_t) 0; 2621 hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); 2622 pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL); 2623 return 0; 2624 2625 } 2626 2627 static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) 2628 { 2629 struct km_event c; 2630 struct xfrm_audit audit_info; 2631 2632 audit_info.loginuid = audit_get_loginuid(current->audit_context); 2633 audit_info.secid = 0; 2634 xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info); 2635 c.data.type = XFRM_POLICY_TYPE_MAIN; 2636 c.event = XFRM_MSG_FLUSHPOLICY; 2637 c.pid = hdr->sadb_msg_pid; 2638 c.seq = hdr->sadb_msg_seq; 2639 km_policy_notify(NULL, 0, &c); 2640 2641 return 0; 2642 } 2643 2644 typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, 2645 struct sadb_msg *hdr, void **ext_hdrs); 2646 static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { 2647 [SADB_RESERVED] = pfkey_reserved, 2648 [SADB_GETSPI] = pfkey_getspi, 2649 [SADB_UPDATE] = pfkey_add, 2650 [SADB_ADD] = pfkey_add, 2651 [SADB_DELETE] = pfkey_delete, 2652 [SADB_GET] = pfkey_get, 2653 [SADB_ACQUIRE] = pfkey_acquire, 2654 [SADB_REGISTER] = pfkey_register, 2655 [SADB_EXPIRE] = NULL, 2656 [SADB_FLUSH] = pfkey_flush, 2657 [SADB_DUMP] = pfkey_dump, 2658 [SADB_X_PROMISC] = pfkey_promisc, 2659 [SADB_X_PCHANGE] = NULL, 2660 [SADB_X_SPDUPDATE] = pfkey_spdadd, 2661 [SADB_X_SPDADD] = pfkey_spdadd, 2662 [SADB_X_SPDDELETE] = pfkey_spddelete, 2663 [SADB_X_SPDGET] = pfkey_spdget, 2664 [SADB_X_SPDACQUIRE] = NULL, 2665 [SADB_X_SPDDUMP] = pfkey_spddump, 2666 [SADB_X_SPDFLUSH] = pfkey_spdflush, 2667 [SADB_X_SPDSETIDX] = pfkey_spdadd, 2668 [SADB_X_SPDDELETE2] = pfkey_spdget, 2669 [SADB_X_MIGRATE] = pfkey_migrate, 2670 }; 2671 2672 static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) 2673 { 2674 void *ext_hdrs[SADB_EXT_MAX]; 2675 int err; 2676 2677 pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 2678 BROADCAST_PROMISC_ONLY, NULL); 2679 2680 memset(ext_hdrs, 0, sizeof(ext_hdrs)); 2681 err = parse_exthdrs(skb, hdr, ext_hdrs); 2682 if (!err) { 2683 err = -EOPNOTSUPP; 2684 if (pfkey_funcs[hdr->sadb_msg_type]) 2685 err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); 2686 } 2687 return err; 2688 } 2689 2690 static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) 2691 { 2692 struct sadb_msg *hdr = NULL; 2693 2694 if (skb->len < sizeof(*hdr)) { 2695 *errp = -EMSGSIZE; 2696 } else { 2697 hdr = (struct sadb_msg *) skb->data; 2698 if (hdr->sadb_msg_version != PF_KEY_V2 || 2699 hdr->sadb_msg_reserved != 0 || 2700 (hdr->sadb_msg_type <= SADB_RESERVED || 2701 hdr->sadb_msg_type > SADB_MAX)) { 2702 hdr = NULL; 2703 *errp = -EINVAL; 2704 } else if (hdr->sadb_msg_len != (skb->len / 2705 sizeof(uint64_t)) || 2706 hdr->sadb_msg_len < (sizeof(struct sadb_msg) / 2707 sizeof(uint64_t))) { 2708 hdr = NULL; 2709 *errp = -EMSGSIZE; 2710 } else { 2711 *errp = 0; 2712 } 2713 } 2714 return hdr; 2715 } 2716 2717 static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2718 { 2719 return t->aalgos & (1 << d->desc.sadb_alg_id); 2720 } 2721 2722 static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) 2723 { 2724 return t->ealgos & (1 << d->desc.sadb_alg_id); 2725 } 2726 2727 static int count_ah_combs(struct xfrm_tmpl *t) 2728 { 2729 int i, sz = 0; 2730 2731 for (i = 0; ; i++) { 2732 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2733 if (!aalg) 2734 break; 2735 if (aalg_tmpl_set(t, aalg) && aalg->available) 2736 sz += sizeof(struct sadb_comb); 2737 } 2738 return sz + sizeof(struct sadb_prop); 2739 } 2740 2741 static int count_esp_combs(struct xfrm_tmpl *t) 2742 { 2743 int i, k, sz = 0; 2744 2745 for (i = 0; ; i++) { 2746 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2747 if (!ealg) 2748 break; 2749 2750 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2751 continue; 2752 2753 for (k = 1; ; k++) { 2754 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2755 if (!aalg) 2756 break; 2757 2758 if (aalg_tmpl_set(t, aalg) && aalg->available) 2759 sz += sizeof(struct sadb_comb); 2760 } 2761 } 2762 return sz + sizeof(struct sadb_prop); 2763 } 2764 2765 static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2766 { 2767 struct sadb_prop *p; 2768 int i; 2769 2770 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2771 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2772 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2773 p->sadb_prop_replay = 32; 2774 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2775 2776 for (i = 0; ; i++) { 2777 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); 2778 if (!aalg) 2779 break; 2780 2781 if (aalg_tmpl_set(t, aalg) && aalg->available) { 2782 struct sadb_comb *c; 2783 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2784 memset(c, 0, sizeof(*c)); 2785 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2786 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2787 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2788 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2789 c->sadb_comb_hard_addtime = 24*60*60; 2790 c->sadb_comb_soft_addtime = 20*60*60; 2791 c->sadb_comb_hard_usetime = 8*60*60; 2792 c->sadb_comb_soft_usetime = 7*60*60; 2793 } 2794 } 2795 } 2796 2797 static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) 2798 { 2799 struct sadb_prop *p; 2800 int i, k; 2801 2802 p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); 2803 p->sadb_prop_len = sizeof(struct sadb_prop)/8; 2804 p->sadb_prop_exttype = SADB_EXT_PROPOSAL; 2805 p->sadb_prop_replay = 32; 2806 memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); 2807 2808 for (i=0; ; i++) { 2809 struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); 2810 if (!ealg) 2811 break; 2812 2813 if (!(ealg_tmpl_set(t, ealg) && ealg->available)) 2814 continue; 2815 2816 for (k = 1; ; k++) { 2817 struct sadb_comb *c; 2818 struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); 2819 if (!aalg) 2820 break; 2821 if (!(aalg_tmpl_set(t, aalg) && aalg->available)) 2822 continue; 2823 c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); 2824 memset(c, 0, sizeof(*c)); 2825 p->sadb_prop_len += sizeof(struct sadb_comb)/8; 2826 c->sadb_comb_auth = aalg->desc.sadb_alg_id; 2827 c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; 2828 c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; 2829 c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; 2830 c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; 2831 c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; 2832 c->sadb_comb_hard_addtime = 24*60*60; 2833 c->sadb_comb_soft_addtime = 20*60*60; 2834 c->sadb_comb_hard_usetime = 8*60*60; 2835 c->sadb_comb_soft_usetime = 7*60*60; 2836 } 2837 } 2838 } 2839 2840 static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c) 2841 { 2842 return 0; 2843 } 2844 2845 static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c) 2846 { 2847 struct sk_buff *out_skb; 2848 struct sadb_msg *out_hdr; 2849 int hard; 2850 int hsc; 2851 2852 hard = c->data.hard; 2853 if (hard) 2854 hsc = 2; 2855 else 2856 hsc = 1; 2857 2858 out_skb = pfkey_xfrm_state2msg(x, 0, hsc); 2859 if (IS_ERR(out_skb)) 2860 return PTR_ERR(out_skb); 2861 2862 out_hdr = (struct sadb_msg *) out_skb->data; 2863 out_hdr->sadb_msg_version = PF_KEY_V2; 2864 out_hdr->sadb_msg_type = SADB_EXPIRE; 2865 out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2866 out_hdr->sadb_msg_errno = 0; 2867 out_hdr->sadb_msg_reserved = 0; 2868 out_hdr->sadb_msg_seq = 0; 2869 out_hdr->sadb_msg_pid = 0; 2870 2871 pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 2872 return 0; 2873 } 2874 2875 static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c) 2876 { 2877 switch (c->event) { 2878 case XFRM_MSG_EXPIRE: 2879 return key_notify_sa_expire(x, c); 2880 case XFRM_MSG_DELSA: 2881 case XFRM_MSG_NEWSA: 2882 case XFRM_MSG_UPDSA: 2883 return key_notify_sa(x, c); 2884 case XFRM_MSG_FLUSHSA: 2885 return key_notify_sa_flush(c); 2886 case XFRM_MSG_NEWAE: /* not yet supported */ 2887 break; 2888 default: 2889 printk("pfkey: Unknown SA event %d\n", c->event); 2890 break; 2891 } 2892 2893 return 0; 2894 } 2895 2896 static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) 2897 { 2898 if (xp && xp->type != XFRM_POLICY_TYPE_MAIN) 2899 return 0; 2900 2901 switch (c->event) { 2902 case XFRM_MSG_POLEXPIRE: 2903 return key_notify_policy_expire(xp, c); 2904 case XFRM_MSG_DELPOLICY: 2905 case XFRM_MSG_NEWPOLICY: 2906 case XFRM_MSG_UPDPOLICY: 2907 return key_notify_policy(xp, dir, c); 2908 case XFRM_MSG_FLUSHPOLICY: 2909 if (c->data.type != XFRM_POLICY_TYPE_MAIN) 2910 break; 2911 return key_notify_policy_flush(c); 2912 default: 2913 printk("pfkey: Unknown policy event %d\n", c->event); 2914 break; 2915 } 2916 2917 return 0; 2918 } 2919 2920 static u32 get_acqseq(void) 2921 { 2922 u32 res; 2923 static u32 acqseq; 2924 static DEFINE_SPINLOCK(acqseq_lock); 2925 2926 spin_lock_bh(&acqseq_lock); 2927 res = (++acqseq ? : ++acqseq); 2928 spin_unlock_bh(&acqseq_lock); 2929 return res; 2930 } 2931 2932 static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) 2933 { 2934 struct sk_buff *skb; 2935 struct sadb_msg *hdr; 2936 struct sadb_address *addr; 2937 struct sadb_x_policy *pol; 2938 struct sockaddr_in *sin; 2939 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 2940 struct sockaddr_in6 *sin6; 2941 #endif 2942 int sockaddr_size; 2943 int size; 2944 struct sadb_x_sec_ctx *sec_ctx; 2945 struct xfrm_sec_ctx *xfrm_ctx; 2946 int ctx_size = 0; 2947 2948 sockaddr_size = pfkey_sockaddr_size(x->props.family); 2949 if (!sockaddr_size) 2950 return -EINVAL; 2951 2952 size = sizeof(struct sadb_msg) + 2953 (sizeof(struct sadb_address) * 2) + 2954 (sockaddr_size * 2) + 2955 sizeof(struct sadb_x_policy); 2956 2957 if (x->id.proto == IPPROTO_AH) 2958 size += count_ah_combs(t); 2959 else if (x->id.proto == IPPROTO_ESP) 2960 size += count_esp_combs(t); 2961 2962 if ((xfrm_ctx = x->security)) { 2963 ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len); 2964 size += sizeof(struct sadb_x_sec_ctx) + ctx_size; 2965 } 2966 2967 skb = alloc_skb(size + 16, GFP_ATOMIC); 2968 if (skb == NULL) 2969 return -ENOMEM; 2970 2971 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 2972 hdr->sadb_msg_version = PF_KEY_V2; 2973 hdr->sadb_msg_type = SADB_ACQUIRE; 2974 hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); 2975 hdr->sadb_msg_len = size / sizeof(uint64_t); 2976 hdr->sadb_msg_errno = 0; 2977 hdr->sadb_msg_reserved = 0; 2978 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 2979 hdr->sadb_msg_pid = 0; 2980 2981 /* src address */ 2982 addr = (struct sadb_address*) skb_put(skb, 2983 sizeof(struct sadb_address)+sockaddr_size); 2984 addr->sadb_address_len = 2985 (sizeof(struct sadb_address)+sockaddr_size)/ 2986 sizeof(uint64_t); 2987 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 2988 addr->sadb_address_proto = 0; 2989 addr->sadb_address_reserved = 0; 2990 if (x->props.family == AF_INET) { 2991 addr->sadb_address_prefixlen = 32; 2992 2993 sin = (struct sockaddr_in *) (addr + 1); 2994 sin->sin_family = AF_INET; 2995 sin->sin_addr.s_addr = x->props.saddr.a4; 2996 sin->sin_port = 0; 2997 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 2998 } 2999 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3000 else if (x->props.family == AF_INET6) { 3001 addr->sadb_address_prefixlen = 128; 3002 3003 sin6 = (struct sockaddr_in6 *) (addr + 1); 3004 sin6->sin6_family = AF_INET6; 3005 sin6->sin6_port = 0; 3006 sin6->sin6_flowinfo = 0; 3007 memcpy(&sin6->sin6_addr, 3008 x->props.saddr.a6, sizeof(struct in6_addr)); 3009 sin6->sin6_scope_id = 0; 3010 } 3011 #endif 3012 else 3013 BUG(); 3014 3015 /* dst address */ 3016 addr = (struct sadb_address*) skb_put(skb, 3017 sizeof(struct sadb_address)+sockaddr_size); 3018 addr->sadb_address_len = 3019 (sizeof(struct sadb_address)+sockaddr_size)/ 3020 sizeof(uint64_t); 3021 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3022 addr->sadb_address_proto = 0; 3023 addr->sadb_address_reserved = 0; 3024 if (x->props.family == AF_INET) { 3025 addr->sadb_address_prefixlen = 32; 3026 3027 sin = (struct sockaddr_in *) (addr + 1); 3028 sin->sin_family = AF_INET; 3029 sin->sin_addr.s_addr = x->id.daddr.a4; 3030 sin->sin_port = 0; 3031 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3032 } 3033 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3034 else if (x->props.family == AF_INET6) { 3035 addr->sadb_address_prefixlen = 128; 3036 3037 sin6 = (struct sockaddr_in6 *) (addr + 1); 3038 sin6->sin6_family = AF_INET6; 3039 sin6->sin6_port = 0; 3040 sin6->sin6_flowinfo = 0; 3041 memcpy(&sin6->sin6_addr, 3042 x->id.daddr.a6, sizeof(struct in6_addr)); 3043 sin6->sin6_scope_id = 0; 3044 } 3045 #endif 3046 else 3047 BUG(); 3048 3049 pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); 3050 pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); 3051 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3052 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3053 pol->sadb_x_policy_dir = dir+1; 3054 pol->sadb_x_policy_id = xp->index; 3055 3056 /* Set sadb_comb's. */ 3057 if (x->id.proto == IPPROTO_AH) 3058 dump_ah_combs(skb, t); 3059 else if (x->id.proto == IPPROTO_ESP) 3060 dump_esp_combs(skb, t); 3061 3062 /* security context */ 3063 if (xfrm_ctx) { 3064 sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, 3065 sizeof(struct sadb_x_sec_ctx) + ctx_size); 3066 sec_ctx->sadb_x_sec_len = 3067 (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t); 3068 sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX; 3069 sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi; 3070 sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg; 3071 sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len; 3072 memcpy(sec_ctx + 1, xfrm_ctx->ctx_str, 3073 xfrm_ctx->ctx_len); 3074 } 3075 3076 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 3077 } 3078 3079 static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt, 3080 u8 *data, int len, int *dir) 3081 { 3082 struct xfrm_policy *xp; 3083 struct sadb_x_policy *pol = (struct sadb_x_policy*)data; 3084 struct sadb_x_sec_ctx *sec_ctx; 3085 3086 switch (sk->sk_family) { 3087 case AF_INET: 3088 if (opt != IP_IPSEC_POLICY) { 3089 *dir = -EOPNOTSUPP; 3090 return NULL; 3091 } 3092 break; 3093 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3094 case AF_INET6: 3095 if (opt != IPV6_IPSEC_POLICY) { 3096 *dir = -EOPNOTSUPP; 3097 return NULL; 3098 } 3099 break; 3100 #endif 3101 default: 3102 *dir = -EINVAL; 3103 return NULL; 3104 } 3105 3106 *dir = -EINVAL; 3107 3108 if (len < sizeof(struct sadb_x_policy) || 3109 pol->sadb_x_policy_len*8 > len || 3110 pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || 3111 (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) 3112 return NULL; 3113 3114 xp = xfrm_policy_alloc(GFP_ATOMIC); 3115 if (xp == NULL) { 3116 *dir = -ENOBUFS; 3117 return NULL; 3118 } 3119 3120 xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? 3121 XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); 3122 3123 xp->lft.soft_byte_limit = XFRM_INF; 3124 xp->lft.hard_byte_limit = XFRM_INF; 3125 xp->lft.soft_packet_limit = XFRM_INF; 3126 xp->lft.hard_packet_limit = XFRM_INF; 3127 xp->family = sk->sk_family; 3128 3129 xp->xfrm_nr = 0; 3130 if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 3131 (*dir = parse_ipsecrequests(xp, pol)) < 0) 3132 goto out; 3133 3134 /* security context too */ 3135 if (len >= (pol->sadb_x_policy_len*8 + 3136 sizeof(struct sadb_x_sec_ctx))) { 3137 char *p = (char *)pol; 3138 struct xfrm_user_sec_ctx *uctx; 3139 3140 p += pol->sadb_x_policy_len*8; 3141 sec_ctx = (struct sadb_x_sec_ctx *)p; 3142 if (len < pol->sadb_x_policy_len*8 + 3143 sec_ctx->sadb_x_sec_len) { 3144 *dir = -EINVAL; 3145 goto out; 3146 } 3147 if ((*dir = verify_sec_ctx_len(p))) 3148 goto out; 3149 uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx); 3150 *dir = security_xfrm_policy_alloc(xp, uctx); 3151 kfree(uctx); 3152 3153 if (*dir) 3154 goto out; 3155 } 3156 3157 *dir = pol->sadb_x_policy_dir-1; 3158 return xp; 3159 3160 out: 3161 security_xfrm_policy_free(xp); 3162 kfree(xp); 3163 return NULL; 3164 } 3165 3166 static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport) 3167 { 3168 struct sk_buff *skb; 3169 struct sadb_msg *hdr; 3170 struct sadb_sa *sa; 3171 struct sadb_address *addr; 3172 struct sadb_x_nat_t_port *n_port; 3173 struct sockaddr_in *sin; 3174 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3175 struct sockaddr_in6 *sin6; 3176 #endif 3177 int sockaddr_size; 3178 int size; 3179 __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); 3180 struct xfrm_encap_tmpl *natt = NULL; 3181 3182 sockaddr_size = pfkey_sockaddr_size(x->props.family); 3183 if (!sockaddr_size) 3184 return -EINVAL; 3185 3186 if (!satype) 3187 return -EINVAL; 3188 3189 if (!x->encap) 3190 return -EINVAL; 3191 3192 natt = x->encap; 3193 3194 /* Build an SADB_X_NAT_T_NEW_MAPPING message: 3195 * 3196 * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | 3197 * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) 3198 */ 3199 3200 size = sizeof(struct sadb_msg) + 3201 sizeof(struct sadb_sa) + 3202 (sizeof(struct sadb_address) * 2) + 3203 (sockaddr_size * 2) + 3204 (sizeof(struct sadb_x_nat_t_port) * 2); 3205 3206 skb = alloc_skb(size + 16, GFP_ATOMIC); 3207 if (skb == NULL) 3208 return -ENOMEM; 3209 3210 hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); 3211 hdr->sadb_msg_version = PF_KEY_V2; 3212 hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; 3213 hdr->sadb_msg_satype = satype; 3214 hdr->sadb_msg_len = size / sizeof(uint64_t); 3215 hdr->sadb_msg_errno = 0; 3216 hdr->sadb_msg_reserved = 0; 3217 hdr->sadb_msg_seq = x->km.seq = get_acqseq(); 3218 hdr->sadb_msg_pid = 0; 3219 3220 /* SA */ 3221 sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); 3222 sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); 3223 sa->sadb_sa_exttype = SADB_EXT_SA; 3224 sa->sadb_sa_spi = x->id.spi; 3225 sa->sadb_sa_replay = 0; 3226 sa->sadb_sa_state = 0; 3227 sa->sadb_sa_auth = 0; 3228 sa->sadb_sa_encrypt = 0; 3229 sa->sadb_sa_flags = 0; 3230 3231 /* ADDRESS_SRC (old addr) */ 3232 addr = (struct sadb_address*) 3233 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3234 addr->sadb_address_len = 3235 (sizeof(struct sadb_address)+sockaddr_size)/ 3236 sizeof(uint64_t); 3237 addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; 3238 addr->sadb_address_proto = 0; 3239 addr->sadb_address_reserved = 0; 3240 if (x->props.family == AF_INET) { 3241 addr->sadb_address_prefixlen = 32; 3242 3243 sin = (struct sockaddr_in *) (addr + 1); 3244 sin->sin_family = AF_INET; 3245 sin->sin_addr.s_addr = x->props.saddr.a4; 3246 sin->sin_port = 0; 3247 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3248 } 3249 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3250 else if (x->props.family == AF_INET6) { 3251 addr->sadb_address_prefixlen = 128; 3252 3253 sin6 = (struct sockaddr_in6 *) (addr + 1); 3254 sin6->sin6_family = AF_INET6; 3255 sin6->sin6_port = 0; 3256 sin6->sin6_flowinfo = 0; 3257 memcpy(&sin6->sin6_addr, 3258 x->props.saddr.a6, sizeof(struct in6_addr)); 3259 sin6->sin6_scope_id = 0; 3260 } 3261 #endif 3262 else 3263 BUG(); 3264 3265 /* NAT_T_SPORT (old port) */ 3266 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3267 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3268 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; 3269 n_port->sadb_x_nat_t_port_port = natt->encap_sport; 3270 n_port->sadb_x_nat_t_port_reserved = 0; 3271 3272 /* ADDRESS_DST (new addr) */ 3273 addr = (struct sadb_address*) 3274 skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); 3275 addr->sadb_address_len = 3276 (sizeof(struct sadb_address)+sockaddr_size)/ 3277 sizeof(uint64_t); 3278 addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; 3279 addr->sadb_address_proto = 0; 3280 addr->sadb_address_reserved = 0; 3281 if (x->props.family == AF_INET) { 3282 addr->sadb_address_prefixlen = 32; 3283 3284 sin = (struct sockaddr_in *) (addr + 1); 3285 sin->sin_family = AF_INET; 3286 sin->sin_addr.s_addr = ipaddr->a4; 3287 sin->sin_port = 0; 3288 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3289 } 3290 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3291 else if (x->props.family == AF_INET6) { 3292 addr->sadb_address_prefixlen = 128; 3293 3294 sin6 = (struct sockaddr_in6 *) (addr + 1); 3295 sin6->sin6_family = AF_INET6; 3296 sin6->sin6_port = 0; 3297 sin6->sin6_flowinfo = 0; 3298 memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); 3299 sin6->sin6_scope_id = 0; 3300 } 3301 #endif 3302 else 3303 BUG(); 3304 3305 /* NAT_T_DPORT (new port) */ 3306 n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); 3307 n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); 3308 n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; 3309 n_port->sadb_x_nat_t_port_port = sport; 3310 n_port->sadb_x_nat_t_port_reserved = 0; 3311 3312 return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); 3313 } 3314 3315 #ifdef CONFIG_NET_KEY_MIGRATE 3316 static int set_sadb_address(struct sk_buff *skb, int sasize, int type, 3317 struct xfrm_selector *sel) 3318 { 3319 struct sadb_address *addr; 3320 struct sockaddr_in *sin; 3321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3322 struct sockaddr_in6 *sin6; 3323 #endif 3324 addr = (struct sadb_address *)skb_put(skb, sizeof(struct sadb_address) + sasize); 3325 addr->sadb_address_len = (sizeof(struct sadb_address) + sasize)/8; 3326 addr->sadb_address_exttype = type; 3327 addr->sadb_address_proto = sel->proto; 3328 addr->sadb_address_reserved = 0; 3329 3330 switch (type) { 3331 case SADB_EXT_ADDRESS_SRC: 3332 if (sel->family == AF_INET) { 3333 addr->sadb_address_prefixlen = sel->prefixlen_s; 3334 sin = (struct sockaddr_in *)(addr + 1); 3335 sin->sin_family = AF_INET; 3336 memcpy(&sin->sin_addr.s_addr, &sel->saddr, 3337 sizeof(sin->sin_addr.s_addr)); 3338 sin->sin_port = 0; 3339 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3340 } 3341 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3342 else if (sel->family == AF_INET6) { 3343 addr->sadb_address_prefixlen = sel->prefixlen_s; 3344 sin6 = (struct sockaddr_in6 *)(addr + 1); 3345 sin6->sin6_family = AF_INET6; 3346 sin6->sin6_port = 0; 3347 sin6->sin6_flowinfo = 0; 3348 sin6->sin6_scope_id = 0; 3349 memcpy(&sin6->sin6_addr.s6_addr, &sel->saddr, 3350 sizeof(sin6->sin6_addr.s6_addr)); 3351 } 3352 #endif 3353 break; 3354 case SADB_EXT_ADDRESS_DST: 3355 if (sel->family == AF_INET) { 3356 addr->sadb_address_prefixlen = sel->prefixlen_d; 3357 sin = (struct sockaddr_in *)(addr + 1); 3358 sin->sin_family = AF_INET; 3359 memcpy(&sin->sin_addr.s_addr, &sel->daddr, 3360 sizeof(sin->sin_addr.s_addr)); 3361 sin->sin_port = 0; 3362 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 3363 } 3364 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3365 else if (sel->family == AF_INET6) { 3366 addr->sadb_address_prefixlen = sel->prefixlen_d; 3367 sin6 = (struct sockaddr_in6 *)(addr + 1); 3368 sin6->sin6_family = AF_INET6; 3369 sin6->sin6_port = 0; 3370 sin6->sin6_flowinfo = 0; 3371 sin6->sin6_scope_id = 0; 3372 memcpy(&sin6->sin6_addr.s6_addr, &sel->daddr, 3373 sizeof(sin6->sin6_addr.s6_addr)); 3374 } 3375 #endif 3376 break; 3377 default: 3378 return -EINVAL; 3379 } 3380 3381 return 0; 3382 } 3383 3384 static int set_ipsecrequest(struct sk_buff *skb, 3385 uint8_t proto, uint8_t mode, int level, 3386 uint32_t reqid, uint8_t family, 3387 xfrm_address_t *src, xfrm_address_t *dst) 3388 { 3389 struct sadb_x_ipsecrequest *rq; 3390 struct sockaddr_in *sin; 3391 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3392 struct sockaddr_in6 *sin6; 3393 #endif 3394 int size_req; 3395 3396 size_req = sizeof(struct sadb_x_ipsecrequest) + 3397 pfkey_sockaddr_pair_size(family); 3398 3399 rq = (struct sadb_x_ipsecrequest *)skb_put(skb, size_req); 3400 memset(rq, 0, size_req); 3401 rq->sadb_x_ipsecrequest_len = size_req; 3402 rq->sadb_x_ipsecrequest_proto = proto; 3403 rq->sadb_x_ipsecrequest_mode = mode; 3404 rq->sadb_x_ipsecrequest_level = level; 3405 rq->sadb_x_ipsecrequest_reqid = reqid; 3406 3407 switch (family) { 3408 case AF_INET: 3409 sin = (struct sockaddr_in *)(rq + 1); 3410 sin->sin_family = AF_INET; 3411 memcpy(&sin->sin_addr.s_addr, src, 3412 sizeof(sin->sin_addr.s_addr)); 3413 sin++; 3414 sin->sin_family = AF_INET; 3415 memcpy(&sin->sin_addr.s_addr, dst, 3416 sizeof(sin->sin_addr.s_addr)); 3417 break; 3418 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 3419 case AF_INET6: 3420 sin6 = (struct sockaddr_in6 *)(rq + 1); 3421 sin6->sin6_family = AF_INET6; 3422 sin6->sin6_port = 0; 3423 sin6->sin6_flowinfo = 0; 3424 sin6->sin6_scope_id = 0; 3425 memcpy(&sin6->sin6_addr.s6_addr, src, 3426 sizeof(sin6->sin6_addr.s6_addr)); 3427 sin6++; 3428 sin6->sin6_family = AF_INET6; 3429 sin6->sin6_port = 0; 3430 sin6->sin6_flowinfo = 0; 3431 sin6->sin6_scope_id = 0; 3432 memcpy(&sin6->sin6_addr.s6_addr, dst, 3433 sizeof(sin6->sin6_addr.s6_addr)); 3434 break; 3435 #endif 3436 default: 3437 return -EINVAL; 3438 } 3439 3440 return 0; 3441 } 3442 #endif 3443 3444 #ifdef CONFIG_NET_KEY_MIGRATE 3445 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3446 struct xfrm_migrate *m, int num_bundles) 3447 { 3448 int i; 3449 int sasize_sel; 3450 int size = 0; 3451 int size_pol = 0; 3452 struct sk_buff *skb; 3453 struct sadb_msg *hdr; 3454 struct sadb_x_policy *pol; 3455 struct xfrm_migrate *mp; 3456 3457 if (type != XFRM_POLICY_TYPE_MAIN) 3458 return 0; 3459 3460 if (num_bundles <= 0 || num_bundles > XFRM_MAX_DEPTH) 3461 return -EINVAL; 3462 3463 /* selector */ 3464 sasize_sel = pfkey_sockaddr_size(sel->family); 3465 if (!sasize_sel) 3466 return -EINVAL; 3467 size += (sizeof(struct sadb_address) + sasize_sel) * 2; 3468 3469 /* policy info */ 3470 size_pol += sizeof(struct sadb_x_policy); 3471 3472 /* ipsecrequests */ 3473 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3474 /* old locator pair */ 3475 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3476 pfkey_sockaddr_pair_size(mp->old_family); 3477 /* new locator pair */ 3478 size_pol += sizeof(struct sadb_x_ipsecrequest) + 3479 pfkey_sockaddr_pair_size(mp->new_family); 3480 } 3481 3482 size += sizeof(struct sadb_msg) + size_pol; 3483 3484 /* alloc buffer */ 3485 skb = alloc_skb(size, GFP_ATOMIC); 3486 if (skb == NULL) 3487 return -ENOMEM; 3488 3489 hdr = (struct sadb_msg *)skb_put(skb, sizeof(struct sadb_msg)); 3490 hdr->sadb_msg_version = PF_KEY_V2; 3491 hdr->sadb_msg_type = SADB_X_MIGRATE; 3492 hdr->sadb_msg_satype = pfkey_proto2satype(m->proto); 3493 hdr->sadb_msg_len = size / 8; 3494 hdr->sadb_msg_errno = 0; 3495 hdr->sadb_msg_reserved = 0; 3496 hdr->sadb_msg_seq = 0; 3497 hdr->sadb_msg_pid = 0; 3498 3499 /* selector src */ 3500 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_SRC, sel); 3501 3502 /* selector dst */ 3503 set_sadb_address(skb, sasize_sel, SADB_EXT_ADDRESS_DST, sel); 3504 3505 /* policy information */ 3506 pol = (struct sadb_x_policy *)skb_put(skb, sizeof(struct sadb_x_policy)); 3507 pol->sadb_x_policy_len = size_pol / 8; 3508 pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3509 pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; 3510 pol->sadb_x_policy_dir = dir + 1; 3511 pol->sadb_x_policy_id = 0; 3512 pol->sadb_x_policy_priority = 0; 3513 3514 for (i = 0, mp = m; i < num_bundles; i++, mp++) { 3515 /* old ipsecrequest */ 3516 if (set_ipsecrequest(skb, mp->proto, mp->mode + 1, 3517 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3518 mp->reqid, mp->old_family, 3519 &mp->old_saddr, &mp->old_daddr) < 0) { 3520 return -EINVAL; 3521 } 3522 3523 /* new ipsecrequest */ 3524 if (set_ipsecrequest(skb, mp->proto, mp->mode + 1, 3525 (mp->reqid ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_REQUIRE), 3526 mp->reqid, mp->new_family, 3527 &mp->new_saddr, &mp->new_daddr) < 0) { 3528 return -EINVAL; 3529 } 3530 } 3531 3532 /* broadcast migrate message to sockets */ 3533 pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL); 3534 3535 return 0; 3536 } 3537 #else 3538 static int pfkey_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 3539 struct xfrm_migrate *m, int num_bundles) 3540 { 3541 return -ENOPROTOOPT; 3542 } 3543 #endif 3544 3545 static int pfkey_sendmsg(struct kiocb *kiocb, 3546 struct socket *sock, struct msghdr *msg, size_t len) 3547 { 3548 struct sock *sk = sock->sk; 3549 struct sk_buff *skb = NULL; 3550 struct sadb_msg *hdr = NULL; 3551 int err; 3552 3553 err = -EOPNOTSUPP; 3554 if (msg->msg_flags & MSG_OOB) 3555 goto out; 3556 3557 err = -EMSGSIZE; 3558 if ((unsigned)len > sk->sk_sndbuf - 32) 3559 goto out; 3560 3561 err = -ENOBUFS; 3562 skb = alloc_skb(len, GFP_KERNEL); 3563 if (skb == NULL) 3564 goto out; 3565 3566 err = -EFAULT; 3567 if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) 3568 goto out; 3569 3570 hdr = pfkey_get_base_msg(skb, &err); 3571 if (!hdr) 3572 goto out; 3573 3574 mutex_lock(&xfrm_cfg_mutex); 3575 err = pfkey_process(sk, skb, hdr); 3576 mutex_unlock(&xfrm_cfg_mutex); 3577 3578 out: 3579 if (err && hdr && pfkey_error(hdr, err, sk) == 0) 3580 err = 0; 3581 if (skb) 3582 kfree_skb(skb); 3583 3584 return err ? : len; 3585 } 3586 3587 static int pfkey_recvmsg(struct kiocb *kiocb, 3588 struct socket *sock, struct msghdr *msg, size_t len, 3589 int flags) 3590 { 3591 struct sock *sk = sock->sk; 3592 struct sk_buff *skb; 3593 int copied, err; 3594 3595 err = -EINVAL; 3596 if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) 3597 goto out; 3598 3599 msg->msg_namelen = 0; 3600 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); 3601 if (skb == NULL) 3602 goto out; 3603 3604 copied = skb->len; 3605 if (copied > len) { 3606 msg->msg_flags |= MSG_TRUNC; 3607 copied = len; 3608 } 3609 3610 skb->h.raw = skb->data; 3611 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 3612 if (err) 3613 goto out_free; 3614 3615 sock_recv_timestamp(msg, sk, skb); 3616 3617 err = (flags & MSG_TRUNC) ? skb->len : copied; 3618 3619 out_free: 3620 skb_free_datagram(sk, skb); 3621 out: 3622 return err; 3623 } 3624 3625 static const struct proto_ops pfkey_ops = { 3626 .family = PF_KEY, 3627 .owner = THIS_MODULE, 3628 /* Operations that make no sense on pfkey sockets. */ 3629 .bind = sock_no_bind, 3630 .connect = sock_no_connect, 3631 .socketpair = sock_no_socketpair, 3632 .accept = sock_no_accept, 3633 .getname = sock_no_getname, 3634 .ioctl = sock_no_ioctl, 3635 .listen = sock_no_listen, 3636 .shutdown = sock_no_shutdown, 3637 .setsockopt = sock_no_setsockopt, 3638 .getsockopt = sock_no_getsockopt, 3639 .mmap = sock_no_mmap, 3640 .sendpage = sock_no_sendpage, 3641 3642 /* Now the operations that really occur. */ 3643 .release = pfkey_release, 3644 .poll = datagram_poll, 3645 .sendmsg = pfkey_sendmsg, 3646 .recvmsg = pfkey_recvmsg, 3647 }; 3648 3649 static struct net_proto_family pfkey_family_ops = { 3650 .family = PF_KEY, 3651 .create = pfkey_create, 3652 .owner = THIS_MODULE, 3653 }; 3654 3655 #ifdef CONFIG_PROC_FS 3656 static int pfkey_read_proc(char *buffer, char **start, off_t offset, 3657 int length, int *eof, void *data) 3658 { 3659 off_t pos = 0; 3660 off_t begin = 0; 3661 int len = 0; 3662 struct sock *s; 3663 struct hlist_node *node; 3664 3665 len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); 3666 3667 read_lock(&pfkey_table_lock); 3668 3669 sk_for_each(s, node, &pfkey_table) { 3670 len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", 3671 s, 3672 atomic_read(&s->sk_refcnt), 3673 atomic_read(&s->sk_rmem_alloc), 3674 atomic_read(&s->sk_wmem_alloc), 3675 sock_i_uid(s), 3676 sock_i_ino(s) 3677 ); 3678 3679 buffer[len++] = '\n'; 3680 3681 pos = begin + len; 3682 if (pos < offset) { 3683 len = 0; 3684 begin = pos; 3685 } 3686 if(pos > offset + length) 3687 goto done; 3688 } 3689 *eof = 1; 3690 3691 done: 3692 read_unlock(&pfkey_table_lock); 3693 3694 *start = buffer + (offset - begin); 3695 len -= (offset - begin); 3696 3697 if (len > length) 3698 len = length; 3699 if (len < 0) 3700 len = 0; 3701 3702 return len; 3703 } 3704 #endif 3705 3706 static struct xfrm_mgr pfkeyv2_mgr = 3707 { 3708 .id = "pfkeyv2", 3709 .notify = pfkey_send_notify, 3710 .acquire = pfkey_send_acquire, 3711 .compile_policy = pfkey_compile_policy, 3712 .new_mapping = pfkey_send_new_mapping, 3713 .notify_policy = pfkey_send_policy_notify, 3714 .migrate = pfkey_send_migrate, 3715 }; 3716 3717 static void __exit ipsec_pfkey_exit(void) 3718 { 3719 xfrm_unregister_km(&pfkeyv2_mgr); 3720 remove_proc_entry("net/pfkey", NULL); 3721 sock_unregister(PF_KEY); 3722 proto_unregister(&key_proto); 3723 } 3724 3725 static int __init ipsec_pfkey_init(void) 3726 { 3727 int err = proto_register(&key_proto, 0); 3728 3729 if (err != 0) 3730 goto out; 3731 3732 err = sock_register(&pfkey_family_ops); 3733 if (err != 0) 3734 goto out_unregister_key_proto; 3735 #ifdef CONFIG_PROC_FS 3736 err = -ENOMEM; 3737 if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) 3738 goto out_sock_unregister; 3739 #endif 3740 err = xfrm_register_km(&pfkeyv2_mgr); 3741 if (err != 0) 3742 goto out_remove_proc_entry; 3743 out: 3744 return err; 3745 out_remove_proc_entry: 3746 #ifdef CONFIG_PROC_FS 3747 remove_proc_entry("net/pfkey", NULL); 3748 out_sock_unregister: 3749 #endif 3750 sock_unregister(PF_KEY); 3751 out_unregister_key_proto: 3752 proto_unregister(&key_proto); 3753 goto out; 3754 } 3755 3756 module_init(ipsec_pfkey_init); 3757 module_exit(ipsec_pfkey_exit); 3758 MODULE_LICENSE("GPL"); 3759 MODULE_ALIAS_NETPROTO(PF_KEY); 3760