1 /* 2 * RAW sockets for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/raw.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) 13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/slab.h> 25 #include <linux/sockios.h> 26 #include <linux/net.h> 27 #include <linux/in6.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/icmpv6.h> 31 #include <linux/netfilter.h> 32 #include <linux/netfilter_ipv6.h> 33 #include <linux/skbuff.h> 34 #include <linux/compat.h> 35 #include <asm/uaccess.h> 36 #include <asm/ioctls.h> 37 38 #include <net/net_namespace.h> 39 #include <net/ip.h> 40 #include <net/sock.h> 41 #include <net/snmp.h> 42 43 #include <net/ipv6.h> 44 #include <net/ndisc.h> 45 #include <net/protocol.h> 46 #include <net/ip6_route.h> 47 #include <net/ip6_checksum.h> 48 #include <net/addrconf.h> 49 #include <net/transp_v6.h> 50 #include <net/udp.h> 51 #include <net/inet_common.h> 52 #include <net/tcp_states.h> 53 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 54 #include <net/mip6.h> 55 #endif 56 #include <linux/mroute6.h> 57 58 #include <net/raw.h> 59 #include <net/rawv6.h> 60 #include <net/xfrm.h> 61 62 #include <linux/proc_fs.h> 63 #include <linux/seq_file.h> 64 65 static struct raw_hashinfo raw_v6_hashinfo = { 66 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 67 }; 68 69 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 70 unsigned short num, struct in6_addr *loc_addr, 71 struct in6_addr *rmt_addr, int dif) 72 { 73 struct hlist_node *node; 74 int is_multicast = ipv6_addr_is_multicast(loc_addr); 75 76 sk_for_each_from(sk, node) 77 if (inet_sk(sk)->inet_num == num) { 78 struct ipv6_pinfo *np = inet6_sk(sk); 79 80 if (!net_eq(sock_net(sk), net)) 81 continue; 82 83 if (!ipv6_addr_any(&np->daddr) && 84 !ipv6_addr_equal(&np->daddr, rmt_addr)) 85 continue; 86 87 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 88 continue; 89 90 if (!ipv6_addr_any(&np->rcv_saddr)) { 91 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 92 goto found; 93 if (is_multicast && 94 inet6_mc_check(sk, loc_addr, rmt_addr)) 95 goto found; 96 continue; 97 } 98 goto found; 99 } 100 sk = NULL; 101 found: 102 return sk; 103 } 104 105 /* 106 * 0 - deliver 107 * 1 - block 108 */ 109 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 110 { 111 struct icmp6hdr *icmph; 112 struct raw6_sock *rp = raw6_sk(sk); 113 114 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 115 __u32 *data = &rp->filter.data[0]; 116 int bit_nr; 117 118 icmph = (struct icmp6hdr *) skb->data; 119 bit_nr = icmph->icmp6_type; 120 121 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 122 } 123 return 0; 124 } 125 126 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 127 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); 128 129 int rawv6_mh_filter_register(int (*filter)(struct sock *sock, 130 struct sk_buff *skb)) 131 { 132 rcu_assign_pointer(mh_filter, filter); 133 return 0; 134 } 135 EXPORT_SYMBOL(rawv6_mh_filter_register); 136 137 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, 138 struct sk_buff *skb)) 139 { 140 rcu_assign_pointer(mh_filter, NULL); 141 synchronize_rcu(); 142 return 0; 143 } 144 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 145 146 #endif 147 148 /* 149 * demultiplex raw sockets. 150 * (should consider queueing the skb in the sock receive_queue 151 * without calling rawv6.c) 152 * 153 * Caller owns SKB so we must make clones. 154 */ 155 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 156 { 157 struct in6_addr *saddr; 158 struct in6_addr *daddr; 159 struct sock *sk; 160 int delivered = 0; 161 __u8 hash; 162 struct net *net; 163 164 saddr = &ipv6_hdr(skb)->saddr; 165 daddr = saddr + 1; 166 167 hash = nexthdr & (MAX_INET_PROTOS - 1); 168 169 read_lock(&raw_v6_hashinfo.lock); 170 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 171 172 if (sk == NULL) 173 goto out; 174 175 net = dev_net(skb->dev); 176 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 177 178 while (sk) { 179 int filtered; 180 181 delivered = 1; 182 switch (nexthdr) { 183 case IPPROTO_ICMPV6: 184 filtered = icmpv6_filter(sk, skb); 185 break; 186 187 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 188 case IPPROTO_MH: 189 { 190 /* XXX: To validate MH only once for each packet, 191 * this is placed here. It should be after checking 192 * xfrm policy, however it doesn't. The checking xfrm 193 * policy is placed in rawv6_rcv() because it is 194 * required for each socket. 195 */ 196 int (*filter)(struct sock *sock, struct sk_buff *skb); 197 198 filter = rcu_dereference(mh_filter); 199 filtered = filter ? filter(sk, skb) : 0; 200 break; 201 } 202 #endif 203 default: 204 filtered = 0; 205 break; 206 } 207 208 if (filtered < 0) 209 break; 210 if (filtered == 0) { 211 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 212 213 /* Not releasing hash table! */ 214 if (clone) { 215 nf_reset(clone); 216 rawv6_rcv(sk, clone); 217 } 218 } 219 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 220 IP6CB(skb)->iif); 221 } 222 out: 223 read_unlock(&raw_v6_hashinfo.lock); 224 return delivered; 225 } 226 227 int raw6_local_deliver(struct sk_buff *skb, int nexthdr) 228 { 229 struct sock *raw_sk; 230 231 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]); 232 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 233 raw_sk = NULL; 234 235 return raw_sk != NULL; 236 } 237 238 /* This cleans up af_inet6 a bit. -DaveM */ 239 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 240 { 241 struct inet_sock *inet = inet_sk(sk); 242 struct ipv6_pinfo *np = inet6_sk(sk); 243 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 244 __be32 v4addr = 0; 245 int addr_type; 246 int err; 247 248 if (addr_len < SIN6_LEN_RFC2133) 249 return -EINVAL; 250 addr_type = ipv6_addr_type(&addr->sin6_addr); 251 252 /* Raw sockets are IPv6 only */ 253 if (addr_type == IPV6_ADDR_MAPPED) 254 return -EADDRNOTAVAIL; 255 256 lock_sock(sk); 257 258 err = -EINVAL; 259 if (sk->sk_state != TCP_CLOSE) 260 goto out; 261 262 rcu_read_lock(); 263 /* Check if the address belongs to the host. */ 264 if (addr_type != IPV6_ADDR_ANY) { 265 struct net_device *dev = NULL; 266 267 if (addr_type & IPV6_ADDR_LINKLOCAL) { 268 if (addr_len >= sizeof(struct sockaddr_in6) && 269 addr->sin6_scope_id) { 270 /* Override any existing binding, if another 271 * one is supplied by user. 272 */ 273 sk->sk_bound_dev_if = addr->sin6_scope_id; 274 } 275 276 /* Binding to link-local address requires an interface */ 277 if (!sk->sk_bound_dev_if) 278 goto out_unlock; 279 280 err = -ENODEV; 281 dev = dev_get_by_index_rcu(sock_net(sk), 282 sk->sk_bound_dev_if); 283 if (!dev) 284 goto out_unlock; 285 } 286 287 /* ipv4 addr of the socket is invalid. Only the 288 * unspecified and mapped address have a v4 equivalent. 289 */ 290 v4addr = LOOPBACK4_IPV6; 291 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 292 err = -EADDRNOTAVAIL; 293 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 294 dev, 0)) { 295 goto out_unlock; 296 } 297 } 298 } 299 300 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 301 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 302 if (!(addr_type & IPV6_ADDR_MULTICAST)) 303 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 304 err = 0; 305 out_unlock: 306 rcu_read_unlock(); 307 out: 308 release_sock(sk); 309 return err; 310 } 311 312 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 313 struct inet6_skb_parm *opt, 314 u8 type, u8 code, int offset, __be32 info) 315 { 316 struct inet_sock *inet = inet_sk(sk); 317 struct ipv6_pinfo *np = inet6_sk(sk); 318 int err; 319 int harderr; 320 321 /* Report error on raw socket, if: 322 1. User requested recverr. 323 2. Socket is connected (otherwise the error indication 324 is useless without recverr and error is hard. 325 */ 326 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 327 return; 328 329 harderr = icmpv6_err_convert(type, code, &err); 330 if (type == ICMPV6_PKT_TOOBIG) 331 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 332 333 if (np->recverr) { 334 u8 *payload = skb->data; 335 if (!inet->hdrincl) 336 payload += offset; 337 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 338 } 339 340 if (np->recverr || harderr) { 341 sk->sk_err = err; 342 sk->sk_error_report(sk); 343 } 344 } 345 346 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 347 u8 type, u8 code, int inner_offset, __be32 info) 348 { 349 struct sock *sk; 350 int hash; 351 struct in6_addr *saddr, *daddr; 352 struct net *net; 353 354 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 355 356 read_lock(&raw_v6_hashinfo.lock); 357 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 358 if (sk != NULL) { 359 /* Note: ipv6_hdr(skb) != skb->data */ 360 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 361 saddr = &ip6h->saddr; 362 daddr = &ip6h->daddr; 363 net = dev_net(skb->dev); 364 365 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 366 IP6CB(skb)->iif))) { 367 rawv6_err(sk, skb, NULL, type, code, 368 inner_offset, info); 369 sk = sk_next(sk); 370 } 371 } 372 read_unlock(&raw_v6_hashinfo.lock); 373 } 374 375 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 376 { 377 if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) && 378 skb_checksum_complete(skb)) { 379 atomic_inc(&sk->sk_drops); 380 kfree_skb(skb); 381 return NET_RX_DROP; 382 } 383 384 /* Charge it to the socket. */ 385 if (ip_queue_rcv_skb(sk, skb) < 0) { 386 kfree_skb(skb); 387 return NET_RX_DROP; 388 } 389 390 return 0; 391 } 392 393 /* 394 * This is next to useless... 395 * if we demultiplex in network layer we don't need the extra call 396 * just to queue the skb... 397 * maybe we could have the network decide upon a hint if it 398 * should call raw_rcv for demultiplexing 399 */ 400 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 401 { 402 struct inet_sock *inet = inet_sk(sk); 403 struct raw6_sock *rp = raw6_sk(sk); 404 405 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 406 atomic_inc(&sk->sk_drops); 407 kfree_skb(skb); 408 return NET_RX_DROP; 409 } 410 411 if (!rp->checksum) 412 skb->ip_summed = CHECKSUM_UNNECESSARY; 413 414 if (skb->ip_summed == CHECKSUM_COMPLETE) { 415 skb_postpull_rcsum(skb, skb_network_header(skb), 416 skb_network_header_len(skb)); 417 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 418 &ipv6_hdr(skb)->daddr, 419 skb->len, inet->inet_num, skb->csum)) 420 skb->ip_summed = CHECKSUM_UNNECESSARY; 421 } 422 if (!skb_csum_unnecessary(skb)) 423 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 424 &ipv6_hdr(skb)->daddr, 425 skb->len, 426 inet->inet_num, 0)); 427 428 if (inet->hdrincl) { 429 if (skb_checksum_complete(skb)) { 430 atomic_inc(&sk->sk_drops); 431 kfree_skb(skb); 432 return NET_RX_DROP; 433 } 434 } 435 436 rawv6_rcv_skb(sk, skb); 437 return 0; 438 } 439 440 441 /* 442 * This should be easy, if there is something there 443 * we return it, otherwise we block. 444 */ 445 446 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 447 struct msghdr *msg, size_t len, 448 int noblock, int flags, int *addr_len) 449 { 450 struct ipv6_pinfo *np = inet6_sk(sk); 451 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 452 struct sk_buff *skb; 453 size_t copied; 454 int err; 455 456 if (flags & MSG_OOB) 457 return -EOPNOTSUPP; 458 459 if (addr_len) 460 *addr_len=sizeof(*sin6); 461 462 if (flags & MSG_ERRQUEUE) 463 return ipv6_recv_error(sk, msg, len); 464 465 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 466 return ipv6_recv_rxpmtu(sk, msg, len); 467 468 skb = skb_recv_datagram(sk, flags, noblock, &err); 469 if (!skb) 470 goto out; 471 472 copied = skb->len; 473 if (copied > len) { 474 copied = len; 475 msg->msg_flags |= MSG_TRUNC; 476 } 477 478 if (skb_csum_unnecessary(skb)) { 479 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 480 } else if (msg->msg_flags&MSG_TRUNC) { 481 if (__skb_checksum_complete(skb)) 482 goto csum_copy_err; 483 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 484 } else { 485 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 486 if (err == -EINVAL) 487 goto csum_copy_err; 488 } 489 if (err) 490 goto out_free; 491 492 /* Copy the address. */ 493 if (sin6) { 494 sin6->sin6_family = AF_INET6; 495 sin6->sin6_port = 0; 496 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 497 sin6->sin6_flowinfo = 0; 498 sin6->sin6_scope_id = 0; 499 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 500 sin6->sin6_scope_id = IP6CB(skb)->iif; 501 } 502 503 sock_recv_ts_and_drops(msg, sk, skb); 504 505 if (np->rxopt.all) 506 datagram_recv_ctl(sk, msg, skb); 507 508 err = copied; 509 if (flags & MSG_TRUNC) 510 err = skb->len; 511 512 out_free: 513 skb_free_datagram(sk, skb); 514 out: 515 return err; 516 517 csum_copy_err: 518 skb_kill_datagram(sk, skb, flags); 519 520 /* Error for blocking case is chosen to masquerade 521 as some normal condition. 522 */ 523 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 524 goto out; 525 } 526 527 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 528 struct raw6_sock *rp) 529 { 530 struct sk_buff *skb; 531 int err = 0; 532 int offset; 533 int len; 534 int total_len; 535 __wsum tmp_csum; 536 __sum16 csum; 537 538 if (!rp->checksum) 539 goto send; 540 541 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 542 goto out; 543 544 offset = rp->offset; 545 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 546 skb->data); 547 if (offset >= total_len - 1) { 548 err = -EINVAL; 549 ip6_flush_pending_frames(sk); 550 goto out; 551 } 552 553 /* should be check HW csum miyazawa */ 554 if (skb_queue_len(&sk->sk_write_queue) == 1) { 555 /* 556 * Only one fragment on the socket. 557 */ 558 tmp_csum = skb->csum; 559 } else { 560 struct sk_buff *csum_skb = NULL; 561 tmp_csum = 0; 562 563 skb_queue_walk(&sk->sk_write_queue, skb) { 564 tmp_csum = csum_add(tmp_csum, skb->csum); 565 566 if (csum_skb) 567 continue; 568 569 len = skb->len - skb_transport_offset(skb); 570 if (offset >= len) { 571 offset -= len; 572 continue; 573 } 574 575 csum_skb = skb; 576 } 577 578 skb = csum_skb; 579 } 580 581 offset += skb_transport_offset(skb); 582 if (skb_copy_bits(skb, offset, &csum, 2)) 583 BUG(); 584 585 /* in case cksum was not initialized */ 586 if (unlikely(csum)) 587 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 588 589 csum = csum_ipv6_magic(&fl->fl6_src, 590 &fl->fl6_dst, 591 total_len, fl->proto, tmp_csum); 592 593 if (csum == 0 && fl->proto == IPPROTO_UDP) 594 csum = CSUM_MANGLED_0; 595 596 if (skb_store_bits(skb, offset, &csum, 2)) 597 BUG(); 598 599 send: 600 err = ip6_push_pending_frames(sk); 601 out: 602 return err; 603 } 604 605 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 606 struct flowi *fl, struct dst_entry **dstp, 607 unsigned int flags) 608 { 609 struct ipv6_pinfo *np = inet6_sk(sk); 610 struct ipv6hdr *iph; 611 struct sk_buff *skb; 612 int err; 613 struct rt6_info *rt = (struct rt6_info *)*dstp; 614 615 if (length > rt->dst.dev->mtu) { 616 ipv6_local_error(sk, EMSGSIZE, fl, rt->dst.dev->mtu); 617 return -EMSGSIZE; 618 } 619 if (flags&MSG_PROBE) 620 goto out; 621 622 skb = sock_alloc_send_skb(sk, 623 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15, 624 flags & MSG_DONTWAIT, &err); 625 if (skb == NULL) 626 goto error; 627 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev)); 628 629 skb->priority = sk->sk_priority; 630 skb->mark = sk->sk_mark; 631 skb_dst_set(skb, &rt->dst); 632 *dstp = NULL; 633 634 skb_put(skb, length); 635 skb_reset_network_header(skb); 636 iph = ipv6_hdr(skb); 637 638 skb->ip_summed = CHECKSUM_NONE; 639 640 skb->transport_header = skb->network_header; 641 err = memcpy_fromiovecend((void *)iph, from, 0, length); 642 if (err) 643 goto error_fault; 644 645 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 646 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, 647 rt->dst.dev, dst_output); 648 if (err > 0) 649 err = net_xmit_errno(err); 650 if (err) 651 goto error; 652 out: 653 return 0; 654 655 error_fault: 656 err = -EFAULT; 657 kfree_skb(skb); 658 error: 659 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 660 if (err == -ENOBUFS && !np->recverr) 661 err = 0; 662 return err; 663 } 664 665 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 666 { 667 struct iovec *iov; 668 u8 __user *type = NULL; 669 u8 __user *code = NULL; 670 u8 len = 0; 671 int probed = 0; 672 int i; 673 674 if (!msg->msg_iov) 675 return 0; 676 677 for (i = 0; i < msg->msg_iovlen; i++) { 678 iov = &msg->msg_iov[i]; 679 if (!iov) 680 continue; 681 682 switch (fl->proto) { 683 case IPPROTO_ICMPV6: 684 /* check if one-byte field is readable or not. */ 685 if (iov->iov_base && iov->iov_len < 1) 686 break; 687 688 if (!type) { 689 type = iov->iov_base; 690 /* check if code field is readable or not. */ 691 if (iov->iov_len > 1) 692 code = type + 1; 693 } else if (!code) 694 code = iov->iov_base; 695 696 if (type && code) { 697 if (get_user(fl->fl_icmp_type, type) || 698 get_user(fl->fl_icmp_code, code)) 699 return -EFAULT; 700 probed = 1; 701 } 702 break; 703 case IPPROTO_MH: 704 if (iov->iov_base && iov->iov_len < 1) 705 break; 706 /* check if type field is readable or not. */ 707 if (iov->iov_len > 2 - len) { 708 u8 __user *p = iov->iov_base; 709 if (get_user(fl->fl_mh_type, &p[2 - len])) 710 return -EFAULT; 711 probed = 1; 712 } else 713 len += iov->iov_len; 714 715 break; 716 default: 717 probed = 1; 718 break; 719 } 720 if (probed) 721 break; 722 } 723 return 0; 724 } 725 726 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 727 struct msghdr *msg, size_t len) 728 { 729 struct ipv6_txoptions opt_space; 730 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 731 struct in6_addr *daddr, *final_p, final; 732 struct inet_sock *inet = inet_sk(sk); 733 struct ipv6_pinfo *np = inet6_sk(sk); 734 struct raw6_sock *rp = raw6_sk(sk); 735 struct ipv6_txoptions *opt = NULL; 736 struct ip6_flowlabel *flowlabel = NULL; 737 struct dst_entry *dst = NULL; 738 struct flowi fl; 739 int addr_len = msg->msg_namelen; 740 int hlimit = -1; 741 int tclass = -1; 742 int dontfrag = -1; 743 u16 proto; 744 int err; 745 746 /* Rough check on arithmetic overflow, 747 better check is made in ip6_append_data(). 748 */ 749 if (len > INT_MAX) 750 return -EMSGSIZE; 751 752 /* Mirror BSD error message compatibility */ 753 if (msg->msg_flags & MSG_OOB) 754 return -EOPNOTSUPP; 755 756 /* 757 * Get and verify the address. 758 */ 759 memset(&fl, 0, sizeof(fl)); 760 761 fl.mark = sk->sk_mark; 762 763 if (sin6) { 764 if (addr_len < SIN6_LEN_RFC2133) 765 return -EINVAL; 766 767 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 768 return -EAFNOSUPPORT; 769 770 /* port is the proto value [0..255] carried in nexthdr */ 771 proto = ntohs(sin6->sin6_port); 772 773 if (!proto) 774 proto = inet->inet_num; 775 else if (proto != inet->inet_num) 776 return -EINVAL; 777 778 if (proto > 255) 779 return -EINVAL; 780 781 daddr = &sin6->sin6_addr; 782 if (np->sndflow) { 783 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 784 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 785 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 786 if (flowlabel == NULL) 787 return -EINVAL; 788 daddr = &flowlabel->dst; 789 } 790 } 791 792 /* 793 * Otherwise it will be difficult to maintain 794 * sk->sk_dst_cache. 795 */ 796 if (sk->sk_state == TCP_ESTABLISHED && 797 ipv6_addr_equal(daddr, &np->daddr)) 798 daddr = &np->daddr; 799 800 if (addr_len >= sizeof(struct sockaddr_in6) && 801 sin6->sin6_scope_id && 802 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 803 fl.oif = sin6->sin6_scope_id; 804 } else { 805 if (sk->sk_state != TCP_ESTABLISHED) 806 return -EDESTADDRREQ; 807 808 proto = inet->inet_num; 809 daddr = &np->daddr; 810 fl.fl6_flowlabel = np->flow_label; 811 } 812 813 if (fl.oif == 0) 814 fl.oif = sk->sk_bound_dev_if; 815 816 if (msg->msg_controllen) { 817 opt = &opt_space; 818 memset(opt, 0, sizeof(struct ipv6_txoptions)); 819 opt->tot_len = sizeof(struct ipv6_txoptions); 820 821 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, 822 &tclass, &dontfrag); 823 if (err < 0) { 824 fl6_sock_release(flowlabel); 825 return err; 826 } 827 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 828 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 829 if (flowlabel == NULL) 830 return -EINVAL; 831 } 832 if (!(opt->opt_nflen|opt->opt_flen)) 833 opt = NULL; 834 } 835 if (opt == NULL) 836 opt = np->opt; 837 if (flowlabel) 838 opt = fl6_merge_options(&opt_space, flowlabel, opt); 839 opt = ipv6_fixup_options(&opt_space, opt); 840 841 fl.proto = proto; 842 err = rawv6_probe_proto_opt(&fl, msg); 843 if (err) 844 goto out; 845 846 if (!ipv6_addr_any(daddr)) 847 ipv6_addr_copy(&fl.fl6_dst, daddr); 848 else 849 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 850 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 851 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 852 853 final_p = fl6_update_dst(&fl, opt, &final); 854 855 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 856 fl.oif = np->mcast_oif; 857 security_sk_classify_flow(sk, &fl); 858 859 err = ip6_dst_lookup(sk, &dst, &fl); 860 if (err) 861 goto out; 862 if (final_p) 863 ipv6_addr_copy(&fl.fl6_dst, final_p); 864 865 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 866 if (err < 0) { 867 if (err == -EREMOTE) 868 err = ip6_dst_blackhole(sk, &dst, &fl); 869 if (err < 0) 870 goto out; 871 } 872 873 if (hlimit < 0) { 874 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 875 hlimit = np->mcast_hops; 876 else 877 hlimit = np->hop_limit; 878 if (hlimit < 0) 879 hlimit = ip6_dst_hoplimit(dst); 880 } 881 882 if (tclass < 0) 883 tclass = np->tclass; 884 885 if (dontfrag < 0) 886 dontfrag = np->dontfrag; 887 888 if (msg->msg_flags&MSG_CONFIRM) 889 goto do_confirm; 890 891 back_from_confirm: 892 if (inet->hdrincl) 893 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, &dst, msg->msg_flags); 894 else { 895 lock_sock(sk); 896 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 897 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 898 msg->msg_flags, dontfrag); 899 900 if (err) 901 ip6_flush_pending_frames(sk); 902 else if (!(msg->msg_flags & MSG_MORE)) 903 err = rawv6_push_pending_frames(sk, &fl, rp); 904 release_sock(sk); 905 } 906 done: 907 dst_release(dst); 908 out: 909 fl6_sock_release(flowlabel); 910 return err<0?err:len; 911 do_confirm: 912 dst_confirm(dst); 913 if (!(msg->msg_flags & MSG_PROBE) || len) 914 goto back_from_confirm; 915 err = 0; 916 goto done; 917 } 918 919 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 920 char __user *optval, int optlen) 921 { 922 switch (optname) { 923 case ICMPV6_FILTER: 924 if (optlen > sizeof(struct icmp6_filter)) 925 optlen = sizeof(struct icmp6_filter); 926 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 927 return -EFAULT; 928 return 0; 929 default: 930 return -ENOPROTOOPT; 931 } 932 933 return 0; 934 } 935 936 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 937 char __user *optval, int __user *optlen) 938 { 939 int len; 940 941 switch (optname) { 942 case ICMPV6_FILTER: 943 if (get_user(len, optlen)) 944 return -EFAULT; 945 if (len < 0) 946 return -EINVAL; 947 if (len > sizeof(struct icmp6_filter)) 948 len = sizeof(struct icmp6_filter); 949 if (put_user(len, optlen)) 950 return -EFAULT; 951 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 952 return -EFAULT; 953 return 0; 954 default: 955 return -ENOPROTOOPT; 956 } 957 958 return 0; 959 } 960 961 962 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 963 char __user *optval, unsigned int optlen) 964 { 965 struct raw6_sock *rp = raw6_sk(sk); 966 int val; 967 968 if (get_user(val, (int __user *)optval)) 969 return -EFAULT; 970 971 switch (optname) { 972 case IPV6_CHECKSUM: 973 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 974 level == IPPROTO_IPV6) { 975 /* 976 * RFC3542 tells that IPV6_CHECKSUM socket 977 * option in the IPPROTO_IPV6 level is not 978 * allowed on ICMPv6 sockets. 979 * If you want to set it, use IPPROTO_RAW 980 * level IPV6_CHECKSUM socket option 981 * (Linux extension). 982 */ 983 return -EINVAL; 984 } 985 986 /* You may get strange result with a positive odd offset; 987 RFC2292bis agrees with me. */ 988 if (val > 0 && (val&1)) 989 return -EINVAL; 990 if (val < 0) { 991 rp->checksum = 0; 992 } else { 993 rp->checksum = 1; 994 rp->offset = val; 995 } 996 997 return 0; 998 break; 999 1000 default: 1001 return -ENOPROTOOPT; 1002 } 1003 } 1004 1005 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1006 char __user *optval, unsigned int optlen) 1007 { 1008 switch(level) { 1009 case SOL_RAW: 1010 break; 1011 1012 case SOL_ICMPV6: 1013 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1014 return -EOPNOTSUPP; 1015 return rawv6_seticmpfilter(sk, level, optname, optval, 1016 optlen); 1017 case SOL_IPV6: 1018 if (optname == IPV6_CHECKSUM) 1019 break; 1020 default: 1021 return ipv6_setsockopt(sk, level, optname, optval, 1022 optlen); 1023 } 1024 1025 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1026 } 1027 1028 #ifdef CONFIG_COMPAT 1029 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1030 char __user *optval, unsigned int optlen) 1031 { 1032 switch (level) { 1033 case SOL_RAW: 1034 break; 1035 case SOL_ICMPV6: 1036 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1037 return -EOPNOTSUPP; 1038 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1039 case SOL_IPV6: 1040 if (optname == IPV6_CHECKSUM) 1041 break; 1042 default: 1043 return compat_ipv6_setsockopt(sk, level, optname, 1044 optval, optlen); 1045 } 1046 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1047 } 1048 #endif 1049 1050 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1051 char __user *optval, int __user *optlen) 1052 { 1053 struct raw6_sock *rp = raw6_sk(sk); 1054 int val, len; 1055 1056 if (get_user(len,optlen)) 1057 return -EFAULT; 1058 1059 switch (optname) { 1060 case IPV6_CHECKSUM: 1061 /* 1062 * We allow getsockopt() for IPPROTO_IPV6-level 1063 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1064 * since RFC3542 is silent about it. 1065 */ 1066 if (rp->checksum == 0) 1067 val = -1; 1068 else 1069 val = rp->offset; 1070 break; 1071 1072 default: 1073 return -ENOPROTOOPT; 1074 } 1075 1076 len = min_t(unsigned int, sizeof(int), len); 1077 1078 if (put_user(len, optlen)) 1079 return -EFAULT; 1080 if (copy_to_user(optval,&val,len)) 1081 return -EFAULT; 1082 return 0; 1083 } 1084 1085 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1086 char __user *optval, int __user *optlen) 1087 { 1088 switch(level) { 1089 case SOL_RAW: 1090 break; 1091 1092 case SOL_ICMPV6: 1093 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1094 return -EOPNOTSUPP; 1095 return rawv6_geticmpfilter(sk, level, optname, optval, 1096 optlen); 1097 case SOL_IPV6: 1098 if (optname == IPV6_CHECKSUM) 1099 break; 1100 default: 1101 return ipv6_getsockopt(sk, level, optname, optval, 1102 optlen); 1103 } 1104 1105 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1106 } 1107 1108 #ifdef CONFIG_COMPAT 1109 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1110 char __user *optval, int __user *optlen) 1111 { 1112 switch (level) { 1113 case SOL_RAW: 1114 break; 1115 case SOL_ICMPV6: 1116 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1117 return -EOPNOTSUPP; 1118 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1119 case SOL_IPV6: 1120 if (optname == IPV6_CHECKSUM) 1121 break; 1122 default: 1123 return compat_ipv6_getsockopt(sk, level, optname, 1124 optval, optlen); 1125 } 1126 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1127 } 1128 #endif 1129 1130 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1131 { 1132 switch(cmd) { 1133 case SIOCOUTQ: 1134 { 1135 int amount = sk_wmem_alloc_get(sk); 1136 1137 return put_user(amount, (int __user *)arg); 1138 } 1139 case SIOCINQ: 1140 { 1141 struct sk_buff *skb; 1142 int amount = 0; 1143 1144 spin_lock_bh(&sk->sk_receive_queue.lock); 1145 skb = skb_peek(&sk->sk_receive_queue); 1146 if (skb != NULL) 1147 amount = skb->tail - skb->transport_header; 1148 spin_unlock_bh(&sk->sk_receive_queue.lock); 1149 return put_user(amount, (int __user *)arg); 1150 } 1151 1152 default: 1153 #ifdef CONFIG_IPV6_MROUTE 1154 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1155 #else 1156 return -ENOIOCTLCMD; 1157 #endif 1158 } 1159 } 1160 1161 #ifdef CONFIG_COMPAT 1162 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1163 { 1164 switch (cmd) { 1165 case SIOCOUTQ: 1166 case SIOCINQ: 1167 return -ENOIOCTLCMD; 1168 default: 1169 #ifdef CONFIG_IPV6_MROUTE 1170 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1171 #else 1172 return -ENOIOCTLCMD; 1173 #endif 1174 } 1175 } 1176 #endif 1177 1178 static void rawv6_close(struct sock *sk, long timeout) 1179 { 1180 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1181 ip6_ra_control(sk, -1); 1182 ip6mr_sk_done(sk); 1183 sk_common_release(sk); 1184 } 1185 1186 static void raw6_destroy(struct sock *sk) 1187 { 1188 lock_sock(sk); 1189 ip6_flush_pending_frames(sk); 1190 release_sock(sk); 1191 1192 inet6_destroy_sock(sk); 1193 } 1194 1195 static int rawv6_init_sk(struct sock *sk) 1196 { 1197 struct raw6_sock *rp = raw6_sk(sk); 1198 1199 switch (inet_sk(sk)->inet_num) { 1200 case IPPROTO_ICMPV6: 1201 rp->checksum = 1; 1202 rp->offset = 2; 1203 break; 1204 case IPPROTO_MH: 1205 rp->checksum = 1; 1206 rp->offset = 4; 1207 break; 1208 default: 1209 break; 1210 } 1211 return 0; 1212 } 1213 1214 struct proto rawv6_prot = { 1215 .name = "RAWv6", 1216 .owner = THIS_MODULE, 1217 .close = rawv6_close, 1218 .destroy = raw6_destroy, 1219 .connect = ip6_datagram_connect, 1220 .disconnect = udp_disconnect, 1221 .ioctl = rawv6_ioctl, 1222 .init = rawv6_init_sk, 1223 .setsockopt = rawv6_setsockopt, 1224 .getsockopt = rawv6_getsockopt, 1225 .sendmsg = rawv6_sendmsg, 1226 .recvmsg = rawv6_recvmsg, 1227 .bind = rawv6_bind, 1228 .backlog_rcv = rawv6_rcv_skb, 1229 .hash = raw_hash_sk, 1230 .unhash = raw_unhash_sk, 1231 .obj_size = sizeof(struct raw6_sock), 1232 .h.raw_hash = &raw_v6_hashinfo, 1233 #ifdef CONFIG_COMPAT 1234 .compat_setsockopt = compat_rawv6_setsockopt, 1235 .compat_getsockopt = compat_rawv6_getsockopt, 1236 .compat_ioctl = compat_rawv6_ioctl, 1237 #endif 1238 }; 1239 1240 #ifdef CONFIG_PROC_FS 1241 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1242 { 1243 struct ipv6_pinfo *np = inet6_sk(sp); 1244 struct in6_addr *dest, *src; 1245 __u16 destp, srcp; 1246 1247 dest = &np->daddr; 1248 src = &np->rcv_saddr; 1249 destp = 0; 1250 srcp = inet_sk(sp)->inet_num; 1251 seq_printf(seq, 1252 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1253 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1254 i, 1255 src->s6_addr32[0], src->s6_addr32[1], 1256 src->s6_addr32[2], src->s6_addr32[3], srcp, 1257 dest->s6_addr32[0], dest->s6_addr32[1], 1258 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1259 sp->sk_state, 1260 sk_wmem_alloc_get(sp), 1261 sk_rmem_alloc_get(sp), 1262 0, 0L, 0, 1263 sock_i_uid(sp), 0, 1264 sock_i_ino(sp), 1265 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1266 } 1267 1268 static int raw6_seq_show(struct seq_file *seq, void *v) 1269 { 1270 if (v == SEQ_START_TOKEN) 1271 seq_printf(seq, 1272 " sl " 1273 "local_address " 1274 "remote_address " 1275 "st tx_queue rx_queue tr tm->when retrnsmt" 1276 " uid timeout inode ref pointer drops\n"); 1277 else 1278 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1279 return 0; 1280 } 1281 1282 static const struct seq_operations raw6_seq_ops = { 1283 .start = raw_seq_start, 1284 .next = raw_seq_next, 1285 .stop = raw_seq_stop, 1286 .show = raw6_seq_show, 1287 }; 1288 1289 static int raw6_seq_open(struct inode *inode, struct file *file) 1290 { 1291 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1292 } 1293 1294 static const struct file_operations raw6_seq_fops = { 1295 .owner = THIS_MODULE, 1296 .open = raw6_seq_open, 1297 .read = seq_read, 1298 .llseek = seq_lseek, 1299 .release = seq_release_net, 1300 }; 1301 1302 static int __net_init raw6_init_net(struct net *net) 1303 { 1304 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1305 return -ENOMEM; 1306 1307 return 0; 1308 } 1309 1310 static void __net_exit raw6_exit_net(struct net *net) 1311 { 1312 proc_net_remove(net, "raw6"); 1313 } 1314 1315 static struct pernet_operations raw6_net_ops = { 1316 .init = raw6_init_net, 1317 .exit = raw6_exit_net, 1318 }; 1319 1320 int __init raw6_proc_init(void) 1321 { 1322 return register_pernet_subsys(&raw6_net_ops); 1323 } 1324 1325 void raw6_proc_exit(void) 1326 { 1327 unregister_pernet_subsys(&raw6_net_ops); 1328 } 1329 #endif /* CONFIG_PROC_FS */ 1330 1331 /* Same as inet6_dgram_ops, sans udp_poll. */ 1332 static const struct proto_ops inet6_sockraw_ops = { 1333 .family = PF_INET6, 1334 .owner = THIS_MODULE, 1335 .release = inet6_release, 1336 .bind = inet6_bind, 1337 .connect = inet_dgram_connect, /* ok */ 1338 .socketpair = sock_no_socketpair, /* a do nothing */ 1339 .accept = sock_no_accept, /* a do nothing */ 1340 .getname = inet6_getname, 1341 .poll = datagram_poll, /* ok */ 1342 .ioctl = inet6_ioctl, /* must change */ 1343 .listen = sock_no_listen, /* ok */ 1344 .shutdown = inet_shutdown, /* ok */ 1345 .setsockopt = sock_common_setsockopt, /* ok */ 1346 .getsockopt = sock_common_getsockopt, /* ok */ 1347 .sendmsg = inet_sendmsg, /* ok */ 1348 .recvmsg = sock_common_recvmsg, /* ok */ 1349 .mmap = sock_no_mmap, 1350 .sendpage = sock_no_sendpage, 1351 #ifdef CONFIG_COMPAT 1352 .compat_setsockopt = compat_sock_common_setsockopt, 1353 .compat_getsockopt = compat_sock_common_getsockopt, 1354 #endif 1355 }; 1356 1357 static struct inet_protosw rawv6_protosw = { 1358 .type = SOCK_RAW, 1359 .protocol = IPPROTO_IP, /* wild card */ 1360 .prot = &rawv6_prot, 1361 .ops = &inet6_sockraw_ops, 1362 .no_check = UDP_CSUM_DEFAULT, 1363 .flags = INET_PROTOSW_REUSE, 1364 }; 1365 1366 int __init rawv6_init(void) 1367 { 1368 int ret; 1369 1370 ret = inet6_register_protosw(&rawv6_protosw); 1371 if (ret) 1372 goto out; 1373 out: 1374 return ret; 1375 } 1376 1377 void rawv6_exit(void) 1378 { 1379 inet6_unregister_protosw(&rawv6_protosw); 1380 } 1381