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/sockios.h> 25 #include <linux/net.h> 26 #include <linux/in6.h> 27 #include <linux/netdevice.h> 28 #include <linux/if_arp.h> 29 #include <linux/icmpv6.h> 30 #include <linux/netfilter.h> 31 #include <linux/netfilter_ipv6.h> 32 #include <linux/skbuff.h> 33 #include <asm/uaccess.h> 34 #include <asm/ioctls.h> 35 36 #include <net/net_namespace.h> 37 #include <net/ip.h> 38 #include <net/sock.h> 39 #include <net/snmp.h> 40 41 #include <net/ipv6.h> 42 #include <net/ndisc.h> 43 #include <net/protocol.h> 44 #include <net/ip6_route.h> 45 #include <net/ip6_checksum.h> 46 #include <net/addrconf.h> 47 #include <net/transp_v6.h> 48 #include <net/udp.h> 49 #include <net/inet_common.h> 50 #include <net/tcp_states.h> 51 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 52 #include <net/mip6.h> 53 #endif 54 #include <linux/mroute6.h> 55 56 #include <net/raw.h> 57 #include <net/rawv6.h> 58 #include <net/xfrm.h> 59 60 #include <linux/proc_fs.h> 61 #include <linux/seq_file.h> 62 63 static struct raw_hashinfo raw_v6_hashinfo = { 64 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 65 }; 66 67 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 68 unsigned short num, struct in6_addr *loc_addr, 69 struct in6_addr *rmt_addr, int dif) 70 { 71 struct hlist_node *node; 72 int is_multicast = ipv6_addr_is_multicast(loc_addr); 73 74 sk_for_each_from(sk, node) 75 if (inet_sk(sk)->inet_num == num) { 76 struct ipv6_pinfo *np = inet6_sk(sk); 77 78 if (!net_eq(sock_net(sk), net)) 79 continue; 80 81 if (!ipv6_addr_any(&np->daddr) && 82 !ipv6_addr_equal(&np->daddr, rmt_addr)) 83 continue; 84 85 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 86 continue; 87 88 if (!ipv6_addr_any(&np->rcv_saddr)) { 89 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 90 goto found; 91 if (is_multicast && 92 inet6_mc_check(sk, loc_addr, rmt_addr)) 93 goto found; 94 continue; 95 } 96 goto found; 97 } 98 sk = NULL; 99 found: 100 return sk; 101 } 102 103 /* 104 * 0 - deliver 105 * 1 - block 106 */ 107 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 108 { 109 struct icmp6hdr *icmph; 110 struct raw6_sock *rp = raw6_sk(sk); 111 112 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 113 __u32 *data = &rp->filter.data[0]; 114 int bit_nr; 115 116 icmph = (struct icmp6hdr *) skb->data; 117 bit_nr = icmph->icmp6_type; 118 119 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 120 } 121 return 0; 122 } 123 124 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 125 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); 126 127 int rawv6_mh_filter_register(int (*filter)(struct sock *sock, 128 struct sk_buff *skb)) 129 { 130 rcu_assign_pointer(mh_filter, filter); 131 return 0; 132 } 133 EXPORT_SYMBOL(rawv6_mh_filter_register); 134 135 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, 136 struct sk_buff *skb)) 137 { 138 rcu_assign_pointer(mh_filter, NULL); 139 synchronize_rcu(); 140 return 0; 141 } 142 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 143 144 #endif 145 146 /* 147 * demultiplex raw sockets. 148 * (should consider queueing the skb in the sock receive_queue 149 * without calling rawv6.c) 150 * 151 * Caller owns SKB so we must make clones. 152 */ 153 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 154 { 155 struct in6_addr *saddr; 156 struct in6_addr *daddr; 157 struct sock *sk; 158 int delivered = 0; 159 __u8 hash; 160 struct net *net; 161 162 saddr = &ipv6_hdr(skb)->saddr; 163 daddr = saddr + 1; 164 165 hash = nexthdr & (MAX_INET_PROTOS - 1); 166 167 read_lock(&raw_v6_hashinfo.lock); 168 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 169 170 if (sk == NULL) 171 goto out; 172 173 net = dev_net(skb->dev); 174 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 175 176 while (sk) { 177 int filtered; 178 179 delivered = 1; 180 switch (nexthdr) { 181 case IPPROTO_ICMPV6: 182 filtered = icmpv6_filter(sk, skb); 183 break; 184 185 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 186 case IPPROTO_MH: 187 { 188 /* XXX: To validate MH only once for each packet, 189 * this is placed here. It should be after checking 190 * xfrm policy, however it doesn't. The checking xfrm 191 * policy is placed in rawv6_rcv() because it is 192 * required for each socket. 193 */ 194 int (*filter)(struct sock *sock, struct sk_buff *skb); 195 196 filter = rcu_dereference(mh_filter); 197 filtered = filter ? filter(sk, skb) : 0; 198 break; 199 } 200 #endif 201 default: 202 filtered = 0; 203 break; 204 } 205 206 if (filtered < 0) 207 break; 208 if (filtered == 0) { 209 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 210 211 /* Not releasing hash table! */ 212 if (clone) { 213 nf_reset(clone); 214 rawv6_rcv(sk, clone); 215 } 216 } 217 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 218 IP6CB(skb)->iif); 219 } 220 out: 221 read_unlock(&raw_v6_hashinfo.lock); 222 return delivered; 223 } 224 225 int raw6_local_deliver(struct sk_buff *skb, int nexthdr) 226 { 227 struct sock *raw_sk; 228 229 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]); 230 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 231 raw_sk = NULL; 232 233 return raw_sk != NULL; 234 } 235 236 /* This cleans up af_inet6 a bit. -DaveM */ 237 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 238 { 239 struct inet_sock *inet = inet_sk(sk); 240 struct ipv6_pinfo *np = inet6_sk(sk); 241 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 242 __be32 v4addr = 0; 243 int addr_type; 244 int err; 245 246 if (addr_len < SIN6_LEN_RFC2133) 247 return -EINVAL; 248 addr_type = ipv6_addr_type(&addr->sin6_addr); 249 250 /* Raw sockets are IPv6 only */ 251 if (addr_type == IPV6_ADDR_MAPPED) 252 return -EADDRNOTAVAIL; 253 254 lock_sock(sk); 255 256 err = -EINVAL; 257 if (sk->sk_state != TCP_CLOSE) 258 goto out; 259 260 rcu_read_lock(); 261 /* Check if the address belongs to the host. */ 262 if (addr_type != IPV6_ADDR_ANY) { 263 struct net_device *dev = NULL; 264 265 if (addr_type & IPV6_ADDR_LINKLOCAL) { 266 if (addr_len >= sizeof(struct sockaddr_in6) && 267 addr->sin6_scope_id) { 268 /* Override any existing binding, if another 269 * one is supplied by user. 270 */ 271 sk->sk_bound_dev_if = addr->sin6_scope_id; 272 } 273 274 /* Binding to link-local address requires an interface */ 275 if (!sk->sk_bound_dev_if) 276 goto out_unlock; 277 278 err = -ENODEV; 279 dev = dev_get_by_index_rcu(sock_net(sk), 280 sk->sk_bound_dev_if); 281 if (!dev) 282 goto out_unlock; 283 } 284 285 /* ipv4 addr of the socket is invalid. Only the 286 * unspecified and mapped address have a v4 equivalent. 287 */ 288 v4addr = LOOPBACK4_IPV6; 289 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 290 err = -EADDRNOTAVAIL; 291 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 292 dev, 0)) { 293 goto out_unlock; 294 } 295 } 296 } 297 298 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 299 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 300 if (!(addr_type & IPV6_ADDR_MULTICAST)) 301 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 302 err = 0; 303 out_unlock: 304 rcu_read_unlock(); 305 out: 306 release_sock(sk); 307 return err; 308 } 309 310 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 311 struct inet6_skb_parm *opt, 312 u8 type, u8 code, int offset, __be32 info) 313 { 314 struct inet_sock *inet = inet_sk(sk); 315 struct ipv6_pinfo *np = inet6_sk(sk); 316 int err; 317 int harderr; 318 319 /* Report error on raw socket, if: 320 1. User requested recverr. 321 2. Socket is connected (otherwise the error indication 322 is useless without recverr and error is hard. 323 */ 324 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 325 return; 326 327 harderr = icmpv6_err_convert(type, code, &err); 328 if (type == ICMPV6_PKT_TOOBIG) 329 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 330 331 if (np->recverr) { 332 u8 *payload = skb->data; 333 if (!inet->hdrincl) 334 payload += offset; 335 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 336 } 337 338 if (np->recverr || harderr) { 339 sk->sk_err = err; 340 sk->sk_error_report(sk); 341 } 342 } 343 344 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 345 u8 type, u8 code, int inner_offset, __be32 info) 346 { 347 struct sock *sk; 348 int hash; 349 struct in6_addr *saddr, *daddr; 350 struct net *net; 351 352 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 353 354 read_lock(&raw_v6_hashinfo.lock); 355 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 356 if (sk != NULL) { 357 /* Note: ipv6_hdr(skb) != skb->data */ 358 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 359 saddr = &ip6h->saddr; 360 daddr = &ip6h->daddr; 361 net = dev_net(skb->dev); 362 363 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 364 IP6CB(skb)->iif))) { 365 rawv6_err(sk, skb, NULL, type, code, 366 inner_offset, info); 367 sk = sk_next(sk); 368 } 369 } 370 read_unlock(&raw_v6_hashinfo.lock); 371 } 372 373 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 374 { 375 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 376 skb_checksum_complete(skb)) { 377 atomic_inc(&sk->sk_drops); 378 kfree_skb(skb); 379 return NET_RX_DROP; 380 } 381 382 /* Charge it to the socket. */ 383 if (sock_queue_rcv_skb(sk, skb) < 0) { 384 kfree_skb(skb); 385 return NET_RX_DROP; 386 } 387 388 return 0; 389 } 390 391 /* 392 * This is next to useless... 393 * if we demultiplex in network layer we don't need the extra call 394 * just to queue the skb... 395 * maybe we could have the network decide upon a hint if it 396 * should call raw_rcv for demultiplexing 397 */ 398 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 399 { 400 struct inet_sock *inet = inet_sk(sk); 401 struct raw6_sock *rp = raw6_sk(sk); 402 403 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 404 atomic_inc(&sk->sk_drops); 405 kfree_skb(skb); 406 return NET_RX_DROP; 407 } 408 409 if (!rp->checksum) 410 skb->ip_summed = CHECKSUM_UNNECESSARY; 411 412 if (skb->ip_summed == CHECKSUM_COMPLETE) { 413 skb_postpull_rcsum(skb, skb_network_header(skb), 414 skb_network_header_len(skb)); 415 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 416 &ipv6_hdr(skb)->daddr, 417 skb->len, inet->inet_num, skb->csum)) 418 skb->ip_summed = CHECKSUM_UNNECESSARY; 419 } 420 if (!skb_csum_unnecessary(skb)) 421 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 422 &ipv6_hdr(skb)->daddr, 423 skb->len, 424 inet->inet_num, 0)); 425 426 if (inet->hdrincl) { 427 if (skb_checksum_complete(skb)) { 428 atomic_inc(&sk->sk_drops); 429 kfree_skb(skb); 430 return NET_RX_DROP; 431 } 432 } 433 434 rawv6_rcv_skb(sk, skb); 435 return 0; 436 } 437 438 439 /* 440 * This should be easy, if there is something there 441 * we return it, otherwise we block. 442 */ 443 444 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 445 struct msghdr *msg, size_t len, 446 int noblock, int flags, int *addr_len) 447 { 448 struct ipv6_pinfo *np = inet6_sk(sk); 449 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 450 struct sk_buff *skb; 451 size_t copied; 452 int err; 453 454 if (flags & MSG_OOB) 455 return -EOPNOTSUPP; 456 457 if (addr_len) 458 *addr_len=sizeof(*sin6); 459 460 if (flags & MSG_ERRQUEUE) 461 return ipv6_recv_error(sk, msg, len); 462 463 skb = skb_recv_datagram(sk, flags, noblock, &err); 464 if (!skb) 465 goto out; 466 467 copied = skb->len; 468 if (copied > len) { 469 copied = len; 470 msg->msg_flags |= MSG_TRUNC; 471 } 472 473 if (skb_csum_unnecessary(skb)) { 474 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 475 } else if (msg->msg_flags&MSG_TRUNC) { 476 if (__skb_checksum_complete(skb)) 477 goto csum_copy_err; 478 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 479 } else { 480 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 481 if (err == -EINVAL) 482 goto csum_copy_err; 483 } 484 if (err) 485 goto out_free; 486 487 /* Copy the address. */ 488 if (sin6) { 489 sin6->sin6_family = AF_INET6; 490 sin6->sin6_port = 0; 491 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 492 sin6->sin6_flowinfo = 0; 493 sin6->sin6_scope_id = 0; 494 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 495 sin6->sin6_scope_id = IP6CB(skb)->iif; 496 } 497 498 sock_recv_ts_and_drops(msg, sk, skb); 499 500 if (np->rxopt.all) 501 datagram_recv_ctl(sk, msg, skb); 502 503 err = copied; 504 if (flags & MSG_TRUNC) 505 err = skb->len; 506 507 out_free: 508 skb_free_datagram(sk, skb); 509 out: 510 return err; 511 512 csum_copy_err: 513 skb_kill_datagram(sk, skb, flags); 514 515 /* Error for blocking case is chosen to masquerade 516 as some normal condition. 517 */ 518 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 519 goto out; 520 } 521 522 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 523 struct raw6_sock *rp) 524 { 525 struct sk_buff *skb; 526 int err = 0; 527 int offset; 528 int len; 529 int total_len; 530 __wsum tmp_csum; 531 __sum16 csum; 532 533 if (!rp->checksum) 534 goto send; 535 536 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 537 goto out; 538 539 offset = rp->offset; 540 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 541 skb->data); 542 if (offset >= total_len - 1) { 543 err = -EINVAL; 544 ip6_flush_pending_frames(sk); 545 goto out; 546 } 547 548 /* should be check HW csum miyazawa */ 549 if (skb_queue_len(&sk->sk_write_queue) == 1) { 550 /* 551 * Only one fragment on the socket. 552 */ 553 tmp_csum = skb->csum; 554 } else { 555 struct sk_buff *csum_skb = NULL; 556 tmp_csum = 0; 557 558 skb_queue_walk(&sk->sk_write_queue, skb) { 559 tmp_csum = csum_add(tmp_csum, skb->csum); 560 561 if (csum_skb) 562 continue; 563 564 len = skb->len - skb_transport_offset(skb); 565 if (offset >= len) { 566 offset -= len; 567 continue; 568 } 569 570 csum_skb = skb; 571 } 572 573 skb = csum_skb; 574 } 575 576 offset += skb_transport_offset(skb); 577 if (skb_copy_bits(skb, offset, &csum, 2)) 578 BUG(); 579 580 /* in case cksum was not initialized */ 581 if (unlikely(csum)) 582 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 583 584 csum = csum_ipv6_magic(&fl->fl6_src, 585 &fl->fl6_dst, 586 total_len, fl->proto, tmp_csum); 587 588 if (csum == 0 && fl->proto == IPPROTO_UDP) 589 csum = CSUM_MANGLED_0; 590 591 if (skb_store_bits(skb, offset, &csum, 2)) 592 BUG(); 593 594 send: 595 err = ip6_push_pending_frames(sk); 596 out: 597 return err; 598 } 599 600 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 601 struct flowi *fl, struct rt6_info *rt, 602 unsigned int flags) 603 { 604 struct ipv6_pinfo *np = inet6_sk(sk); 605 struct ipv6hdr *iph; 606 struct sk_buff *skb; 607 int err; 608 609 if (length > rt->u.dst.dev->mtu) { 610 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 611 return -EMSGSIZE; 612 } 613 if (flags&MSG_PROBE) 614 goto out; 615 616 skb = sock_alloc_send_skb(sk, 617 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, 618 flags & MSG_DONTWAIT, &err); 619 if (skb == NULL) 620 goto error; 621 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); 622 623 skb->priority = sk->sk_priority; 624 skb->mark = sk->sk_mark; 625 skb_dst_set(skb, dst_clone(&rt->u.dst)); 626 627 skb_put(skb, length); 628 skb_reset_network_header(skb); 629 iph = ipv6_hdr(skb); 630 631 skb->ip_summed = CHECKSUM_NONE; 632 633 skb->transport_header = skb->network_header; 634 err = memcpy_fromiovecend((void *)iph, from, 0, length); 635 if (err) 636 goto error_fault; 637 638 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 639 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 640 dst_output); 641 if (err > 0) 642 err = net_xmit_errno(err); 643 if (err) 644 goto error; 645 out: 646 return 0; 647 648 error_fault: 649 err = -EFAULT; 650 kfree_skb(skb); 651 error: 652 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 653 if (err == -ENOBUFS && !np->recverr) 654 err = 0; 655 return err; 656 } 657 658 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 659 { 660 struct iovec *iov; 661 u8 __user *type = NULL; 662 u8 __user *code = NULL; 663 u8 len = 0; 664 int probed = 0; 665 int i; 666 667 if (!msg->msg_iov) 668 return 0; 669 670 for (i = 0; i < msg->msg_iovlen; i++) { 671 iov = &msg->msg_iov[i]; 672 if (!iov) 673 continue; 674 675 switch (fl->proto) { 676 case IPPROTO_ICMPV6: 677 /* check if one-byte field is readable or not. */ 678 if (iov->iov_base && iov->iov_len < 1) 679 break; 680 681 if (!type) { 682 type = iov->iov_base; 683 /* check if code field is readable or not. */ 684 if (iov->iov_len > 1) 685 code = type + 1; 686 } else if (!code) 687 code = iov->iov_base; 688 689 if (type && code) { 690 if (get_user(fl->fl_icmp_type, type) || 691 get_user(fl->fl_icmp_code, code)) 692 return -EFAULT; 693 probed = 1; 694 } 695 break; 696 case IPPROTO_MH: 697 if (iov->iov_base && iov->iov_len < 1) 698 break; 699 /* check if type field is readable or not. */ 700 if (iov->iov_len > 2 - len) { 701 u8 __user *p = iov->iov_base; 702 if (get_user(fl->fl_mh_type, &p[2 - len])) 703 return -EFAULT; 704 probed = 1; 705 } else 706 len += iov->iov_len; 707 708 break; 709 default: 710 probed = 1; 711 break; 712 } 713 if (probed) 714 break; 715 } 716 return 0; 717 } 718 719 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 720 struct msghdr *msg, size_t len) 721 { 722 struct ipv6_txoptions opt_space; 723 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 724 struct in6_addr *daddr, *final_p = NULL, final; 725 struct inet_sock *inet = inet_sk(sk); 726 struct ipv6_pinfo *np = inet6_sk(sk); 727 struct raw6_sock *rp = raw6_sk(sk); 728 struct ipv6_txoptions *opt = NULL; 729 struct ip6_flowlabel *flowlabel = NULL; 730 struct dst_entry *dst = NULL; 731 struct flowi fl; 732 int addr_len = msg->msg_namelen; 733 int hlimit = -1; 734 int tclass = -1; 735 u16 proto; 736 int err; 737 738 /* Rough check on arithmetic overflow, 739 better check is made in ip6_append_data(). 740 */ 741 if (len > INT_MAX) 742 return -EMSGSIZE; 743 744 /* Mirror BSD error message compatibility */ 745 if (msg->msg_flags & MSG_OOB) 746 return -EOPNOTSUPP; 747 748 /* 749 * Get and verify the address. 750 */ 751 memset(&fl, 0, sizeof(fl)); 752 753 fl.mark = sk->sk_mark; 754 755 if (sin6) { 756 if (addr_len < SIN6_LEN_RFC2133) 757 return -EINVAL; 758 759 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 760 return(-EAFNOSUPPORT); 761 762 /* port is the proto value [0..255] carried in nexthdr */ 763 proto = ntohs(sin6->sin6_port); 764 765 if (!proto) 766 proto = inet->inet_num; 767 else if (proto != inet->inet_num) 768 return(-EINVAL); 769 770 if (proto > 255) 771 return(-EINVAL); 772 773 daddr = &sin6->sin6_addr; 774 if (np->sndflow) { 775 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 776 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 777 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 778 if (flowlabel == NULL) 779 return -EINVAL; 780 daddr = &flowlabel->dst; 781 } 782 } 783 784 /* 785 * Otherwise it will be difficult to maintain 786 * sk->sk_dst_cache. 787 */ 788 if (sk->sk_state == TCP_ESTABLISHED && 789 ipv6_addr_equal(daddr, &np->daddr)) 790 daddr = &np->daddr; 791 792 if (addr_len >= sizeof(struct sockaddr_in6) && 793 sin6->sin6_scope_id && 794 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 795 fl.oif = sin6->sin6_scope_id; 796 } else { 797 if (sk->sk_state != TCP_ESTABLISHED) 798 return -EDESTADDRREQ; 799 800 proto = inet->inet_num; 801 daddr = &np->daddr; 802 fl.fl6_flowlabel = np->flow_label; 803 } 804 805 if (fl.oif == 0) 806 fl.oif = sk->sk_bound_dev_if; 807 808 if (msg->msg_controllen) { 809 opt = &opt_space; 810 memset(opt, 0, sizeof(struct ipv6_txoptions)); 811 opt->tot_len = sizeof(struct ipv6_txoptions); 812 813 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 814 if (err < 0) { 815 fl6_sock_release(flowlabel); 816 return err; 817 } 818 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 819 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 820 if (flowlabel == NULL) 821 return -EINVAL; 822 } 823 if (!(opt->opt_nflen|opt->opt_flen)) 824 opt = NULL; 825 } 826 if (opt == NULL) 827 opt = np->opt; 828 if (flowlabel) 829 opt = fl6_merge_options(&opt_space, flowlabel, opt); 830 opt = ipv6_fixup_options(&opt_space, opt); 831 832 fl.proto = proto; 833 err = rawv6_probe_proto_opt(&fl, msg); 834 if (err) 835 goto out; 836 837 if (!ipv6_addr_any(daddr)) 838 ipv6_addr_copy(&fl.fl6_dst, daddr); 839 else 840 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 841 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 842 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 843 844 /* merge ip6_build_xmit from ip6_output */ 845 if (opt && opt->srcrt) { 846 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 847 ipv6_addr_copy(&final, &fl.fl6_dst); 848 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 849 final_p = &final; 850 } 851 852 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 853 fl.oif = np->mcast_oif; 854 security_sk_classify_flow(sk, &fl); 855 856 err = ip6_dst_lookup(sk, &dst, &fl); 857 if (err) 858 goto out; 859 if (final_p) 860 ipv6_addr_copy(&fl.fl6_dst, final_p); 861 862 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 863 if (err < 0) { 864 if (err == -EREMOTE) 865 err = ip6_dst_blackhole(sk, &dst, &fl); 866 if (err < 0) 867 goto out; 868 } 869 870 if (hlimit < 0) { 871 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 872 hlimit = np->mcast_hops; 873 else 874 hlimit = np->hop_limit; 875 if (hlimit < 0) 876 hlimit = ip6_dst_hoplimit(dst); 877 } 878 879 if (tclass < 0) 880 tclass = np->tclass; 881 882 if (msg->msg_flags&MSG_CONFIRM) 883 goto do_confirm; 884 885 back_from_confirm: 886 if (inet->hdrincl) { 887 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 888 } else { 889 lock_sock(sk); 890 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 891 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 892 msg->msg_flags); 893 894 if (err) 895 ip6_flush_pending_frames(sk); 896 else if (!(msg->msg_flags & MSG_MORE)) 897 err = rawv6_push_pending_frames(sk, &fl, rp); 898 release_sock(sk); 899 } 900 done: 901 dst_release(dst); 902 out: 903 fl6_sock_release(flowlabel); 904 return err<0?err:len; 905 do_confirm: 906 dst_confirm(dst); 907 if (!(msg->msg_flags & MSG_PROBE) || len) 908 goto back_from_confirm; 909 err = 0; 910 goto done; 911 } 912 913 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 914 char __user *optval, int optlen) 915 { 916 switch (optname) { 917 case ICMPV6_FILTER: 918 if (optlen > sizeof(struct icmp6_filter)) 919 optlen = sizeof(struct icmp6_filter); 920 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 921 return -EFAULT; 922 return 0; 923 default: 924 return -ENOPROTOOPT; 925 } 926 927 return 0; 928 } 929 930 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 931 char __user *optval, int __user *optlen) 932 { 933 int len; 934 935 switch (optname) { 936 case ICMPV6_FILTER: 937 if (get_user(len, optlen)) 938 return -EFAULT; 939 if (len < 0) 940 return -EINVAL; 941 if (len > sizeof(struct icmp6_filter)) 942 len = sizeof(struct icmp6_filter); 943 if (put_user(len, optlen)) 944 return -EFAULT; 945 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 946 return -EFAULT; 947 return 0; 948 default: 949 return -ENOPROTOOPT; 950 } 951 952 return 0; 953 } 954 955 956 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 957 char __user *optval, unsigned int optlen) 958 { 959 struct raw6_sock *rp = raw6_sk(sk); 960 int val; 961 962 if (get_user(val, (int __user *)optval)) 963 return -EFAULT; 964 965 switch (optname) { 966 case IPV6_CHECKSUM: 967 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 968 level == IPPROTO_IPV6) { 969 /* 970 * RFC3542 tells that IPV6_CHECKSUM socket 971 * option in the IPPROTO_IPV6 level is not 972 * allowed on ICMPv6 sockets. 973 * If you want to set it, use IPPROTO_RAW 974 * level IPV6_CHECKSUM socket option 975 * (Linux extension). 976 */ 977 return -EINVAL; 978 } 979 980 /* You may get strange result with a positive odd offset; 981 RFC2292bis agrees with me. */ 982 if (val > 0 && (val&1)) 983 return(-EINVAL); 984 if (val < 0) { 985 rp->checksum = 0; 986 } else { 987 rp->checksum = 1; 988 rp->offset = val; 989 } 990 991 return 0; 992 break; 993 994 default: 995 return(-ENOPROTOOPT); 996 } 997 } 998 999 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1000 char __user *optval, unsigned int optlen) 1001 { 1002 switch(level) { 1003 case SOL_RAW: 1004 break; 1005 1006 case SOL_ICMPV6: 1007 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1008 return -EOPNOTSUPP; 1009 return rawv6_seticmpfilter(sk, level, optname, optval, 1010 optlen); 1011 case SOL_IPV6: 1012 if (optname == IPV6_CHECKSUM) 1013 break; 1014 default: 1015 return ipv6_setsockopt(sk, level, optname, optval, 1016 optlen); 1017 } 1018 1019 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1020 } 1021 1022 #ifdef CONFIG_COMPAT 1023 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1024 char __user *optval, unsigned int optlen) 1025 { 1026 switch (level) { 1027 case SOL_RAW: 1028 break; 1029 case SOL_ICMPV6: 1030 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1031 return -EOPNOTSUPP; 1032 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1033 case SOL_IPV6: 1034 if (optname == IPV6_CHECKSUM) 1035 break; 1036 default: 1037 return compat_ipv6_setsockopt(sk, level, optname, 1038 optval, optlen); 1039 } 1040 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1041 } 1042 #endif 1043 1044 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1045 char __user *optval, int __user *optlen) 1046 { 1047 struct raw6_sock *rp = raw6_sk(sk); 1048 int val, len; 1049 1050 if (get_user(len,optlen)) 1051 return -EFAULT; 1052 1053 switch (optname) { 1054 case IPV6_CHECKSUM: 1055 /* 1056 * We allow getsockopt() for IPPROTO_IPV6-level 1057 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1058 * since RFC3542 is silent about it. 1059 */ 1060 if (rp->checksum == 0) 1061 val = -1; 1062 else 1063 val = rp->offset; 1064 break; 1065 1066 default: 1067 return -ENOPROTOOPT; 1068 } 1069 1070 len = min_t(unsigned int, sizeof(int), len); 1071 1072 if (put_user(len, optlen)) 1073 return -EFAULT; 1074 if (copy_to_user(optval,&val,len)) 1075 return -EFAULT; 1076 return 0; 1077 } 1078 1079 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1080 char __user *optval, int __user *optlen) 1081 { 1082 switch(level) { 1083 case SOL_RAW: 1084 break; 1085 1086 case SOL_ICMPV6: 1087 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1088 return -EOPNOTSUPP; 1089 return rawv6_geticmpfilter(sk, level, optname, optval, 1090 optlen); 1091 case SOL_IPV6: 1092 if (optname == IPV6_CHECKSUM) 1093 break; 1094 default: 1095 return ipv6_getsockopt(sk, level, optname, optval, 1096 optlen); 1097 } 1098 1099 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1100 } 1101 1102 #ifdef CONFIG_COMPAT 1103 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1104 char __user *optval, int __user *optlen) 1105 { 1106 switch (level) { 1107 case SOL_RAW: 1108 break; 1109 case SOL_ICMPV6: 1110 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1111 return -EOPNOTSUPP; 1112 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1113 case SOL_IPV6: 1114 if (optname == IPV6_CHECKSUM) 1115 break; 1116 default: 1117 return compat_ipv6_getsockopt(sk, level, optname, 1118 optval, optlen); 1119 } 1120 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1121 } 1122 #endif 1123 1124 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1125 { 1126 switch(cmd) { 1127 case SIOCOUTQ: 1128 { 1129 int amount = sk_wmem_alloc_get(sk); 1130 1131 return put_user(amount, (int __user *)arg); 1132 } 1133 case SIOCINQ: 1134 { 1135 struct sk_buff *skb; 1136 int amount = 0; 1137 1138 spin_lock_bh(&sk->sk_receive_queue.lock); 1139 skb = skb_peek(&sk->sk_receive_queue); 1140 if (skb != NULL) 1141 amount = skb->tail - skb->transport_header; 1142 spin_unlock_bh(&sk->sk_receive_queue.lock); 1143 return put_user(amount, (int __user *)arg); 1144 } 1145 1146 default: 1147 #ifdef CONFIG_IPV6_MROUTE 1148 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1149 #else 1150 return -ENOIOCTLCMD; 1151 #endif 1152 } 1153 } 1154 1155 static void rawv6_close(struct sock *sk, long timeout) 1156 { 1157 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1158 ip6_ra_control(sk, -1); 1159 ip6mr_sk_done(sk); 1160 sk_common_release(sk); 1161 } 1162 1163 static void raw6_destroy(struct sock *sk) 1164 { 1165 lock_sock(sk); 1166 ip6_flush_pending_frames(sk); 1167 release_sock(sk); 1168 1169 inet6_destroy_sock(sk); 1170 } 1171 1172 static int rawv6_init_sk(struct sock *sk) 1173 { 1174 struct raw6_sock *rp = raw6_sk(sk); 1175 1176 switch (inet_sk(sk)->inet_num) { 1177 case IPPROTO_ICMPV6: 1178 rp->checksum = 1; 1179 rp->offset = 2; 1180 break; 1181 case IPPROTO_MH: 1182 rp->checksum = 1; 1183 rp->offset = 4; 1184 break; 1185 default: 1186 break; 1187 } 1188 return(0); 1189 } 1190 1191 struct proto rawv6_prot = { 1192 .name = "RAWv6", 1193 .owner = THIS_MODULE, 1194 .close = rawv6_close, 1195 .destroy = raw6_destroy, 1196 .connect = ip6_datagram_connect, 1197 .disconnect = udp_disconnect, 1198 .ioctl = rawv6_ioctl, 1199 .init = rawv6_init_sk, 1200 .setsockopt = rawv6_setsockopt, 1201 .getsockopt = rawv6_getsockopt, 1202 .sendmsg = rawv6_sendmsg, 1203 .recvmsg = rawv6_recvmsg, 1204 .bind = rawv6_bind, 1205 .backlog_rcv = rawv6_rcv_skb, 1206 .hash = raw_hash_sk, 1207 .unhash = raw_unhash_sk, 1208 .obj_size = sizeof(struct raw6_sock), 1209 .h.raw_hash = &raw_v6_hashinfo, 1210 #ifdef CONFIG_COMPAT 1211 .compat_setsockopt = compat_rawv6_setsockopt, 1212 .compat_getsockopt = compat_rawv6_getsockopt, 1213 #endif 1214 }; 1215 1216 #ifdef CONFIG_PROC_FS 1217 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1218 { 1219 struct ipv6_pinfo *np = inet6_sk(sp); 1220 struct in6_addr *dest, *src; 1221 __u16 destp, srcp; 1222 1223 dest = &np->daddr; 1224 src = &np->rcv_saddr; 1225 destp = 0; 1226 srcp = inet_sk(sp)->inet_num; 1227 seq_printf(seq, 1228 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1229 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1230 i, 1231 src->s6_addr32[0], src->s6_addr32[1], 1232 src->s6_addr32[2], src->s6_addr32[3], srcp, 1233 dest->s6_addr32[0], dest->s6_addr32[1], 1234 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1235 sp->sk_state, 1236 sk_wmem_alloc_get(sp), 1237 sk_rmem_alloc_get(sp), 1238 0, 0L, 0, 1239 sock_i_uid(sp), 0, 1240 sock_i_ino(sp), 1241 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1242 } 1243 1244 static int raw6_seq_show(struct seq_file *seq, void *v) 1245 { 1246 if (v == SEQ_START_TOKEN) 1247 seq_printf(seq, 1248 " sl " 1249 "local_address " 1250 "remote_address " 1251 "st tx_queue rx_queue tr tm->when retrnsmt" 1252 " uid timeout inode ref pointer drops\n"); 1253 else 1254 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1255 return 0; 1256 } 1257 1258 static const struct seq_operations raw6_seq_ops = { 1259 .start = raw_seq_start, 1260 .next = raw_seq_next, 1261 .stop = raw_seq_stop, 1262 .show = raw6_seq_show, 1263 }; 1264 1265 static int raw6_seq_open(struct inode *inode, struct file *file) 1266 { 1267 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1268 } 1269 1270 static const struct file_operations raw6_seq_fops = { 1271 .owner = THIS_MODULE, 1272 .open = raw6_seq_open, 1273 .read = seq_read, 1274 .llseek = seq_lseek, 1275 .release = seq_release_net, 1276 }; 1277 1278 static int raw6_init_net(struct net *net) 1279 { 1280 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1281 return -ENOMEM; 1282 1283 return 0; 1284 } 1285 1286 static void raw6_exit_net(struct net *net) 1287 { 1288 proc_net_remove(net, "raw6"); 1289 } 1290 1291 static struct pernet_operations raw6_net_ops = { 1292 .init = raw6_init_net, 1293 .exit = raw6_exit_net, 1294 }; 1295 1296 int __init raw6_proc_init(void) 1297 { 1298 return register_pernet_subsys(&raw6_net_ops); 1299 } 1300 1301 void raw6_proc_exit(void) 1302 { 1303 unregister_pernet_subsys(&raw6_net_ops); 1304 } 1305 #endif /* CONFIG_PROC_FS */ 1306 1307 /* Same as inet6_dgram_ops, sans udp_poll. */ 1308 static const struct proto_ops inet6_sockraw_ops = { 1309 .family = PF_INET6, 1310 .owner = THIS_MODULE, 1311 .release = inet6_release, 1312 .bind = inet6_bind, 1313 .connect = inet_dgram_connect, /* ok */ 1314 .socketpair = sock_no_socketpair, /* a do nothing */ 1315 .accept = sock_no_accept, /* a do nothing */ 1316 .getname = inet6_getname, 1317 .poll = datagram_poll, /* ok */ 1318 .ioctl = inet6_ioctl, /* must change */ 1319 .listen = sock_no_listen, /* ok */ 1320 .shutdown = inet_shutdown, /* ok */ 1321 .setsockopt = sock_common_setsockopt, /* ok */ 1322 .getsockopt = sock_common_getsockopt, /* ok */ 1323 .sendmsg = inet_sendmsg, /* ok */ 1324 .recvmsg = sock_common_recvmsg, /* ok */ 1325 .mmap = sock_no_mmap, 1326 .sendpage = sock_no_sendpage, 1327 #ifdef CONFIG_COMPAT 1328 .compat_setsockopt = compat_sock_common_setsockopt, 1329 .compat_getsockopt = compat_sock_common_getsockopt, 1330 #endif 1331 }; 1332 1333 static struct inet_protosw rawv6_protosw = { 1334 .type = SOCK_RAW, 1335 .protocol = IPPROTO_IP, /* wild card */ 1336 .prot = &rawv6_prot, 1337 .ops = &inet6_sockraw_ops, 1338 .no_check = UDP_CSUM_DEFAULT, 1339 .flags = INET_PROTOSW_REUSE, 1340 }; 1341 1342 int __init rawv6_init(void) 1343 { 1344 int ret; 1345 1346 ret = inet6_register_protosw(&rawv6_protosw); 1347 if (ret) 1348 goto out; 1349 out: 1350 return ret; 1351 } 1352 1353 void rawv6_exit(void) 1354 { 1355 inet6_unregister_protosw(&rawv6_protosw); 1356 } 1357