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 <asm/uaccess.h> 35 #include <asm/ioctls.h> 36 37 #include <net/net_namespace.h> 38 #include <net/ip.h> 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/ndisc.h> 44 #include <net/protocol.h> 45 #include <net/ip6_route.h> 46 #include <net/ip6_checksum.h> 47 #include <net/addrconf.h> 48 #include <net/transp_v6.h> 49 #include <net/udp.h> 50 #include <net/inet_common.h> 51 #include <net/tcp_states.h> 52 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 53 #include <net/mip6.h> 54 #endif 55 #include <linux/mroute6.h> 56 57 #include <net/raw.h> 58 #include <net/rawv6.h> 59 #include <net/xfrm.h> 60 61 #include <linux/proc_fs.h> 62 #include <linux/seq_file.h> 63 64 static struct raw_hashinfo raw_v6_hashinfo = { 65 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 66 }; 67 68 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 69 unsigned short num, struct in6_addr *loc_addr, 70 struct in6_addr *rmt_addr, int dif) 71 { 72 struct hlist_node *node; 73 int is_multicast = ipv6_addr_is_multicast(loc_addr); 74 75 sk_for_each_from(sk, node) 76 if (inet_sk(sk)->inet_num == num) { 77 struct ipv6_pinfo *np = inet6_sk(sk); 78 79 if (!net_eq(sock_net(sk), net)) 80 continue; 81 82 if (!ipv6_addr_any(&np->daddr) && 83 !ipv6_addr_equal(&np->daddr, rmt_addr)) 84 continue; 85 86 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 87 continue; 88 89 if (!ipv6_addr_any(&np->rcv_saddr)) { 90 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 91 goto found; 92 if (is_multicast && 93 inet6_mc_check(sk, loc_addr, rmt_addr)) 94 goto found; 95 continue; 96 } 97 goto found; 98 } 99 sk = NULL; 100 found: 101 return sk; 102 } 103 104 /* 105 * 0 - deliver 106 * 1 - block 107 */ 108 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 109 { 110 struct icmp6hdr *icmph; 111 struct raw6_sock *rp = raw6_sk(sk); 112 113 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 114 __u32 *data = &rp->filter.data[0]; 115 int bit_nr; 116 117 icmph = (struct icmp6hdr *) skb->data; 118 bit_nr = icmph->icmp6_type; 119 120 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 121 } 122 return 0; 123 } 124 125 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 126 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); 127 128 int rawv6_mh_filter_register(int (*filter)(struct sock *sock, 129 struct sk_buff *skb)) 130 { 131 rcu_assign_pointer(mh_filter, filter); 132 return 0; 133 } 134 EXPORT_SYMBOL(rawv6_mh_filter_register); 135 136 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, 137 struct sk_buff *skb)) 138 { 139 rcu_assign_pointer(mh_filter, NULL); 140 synchronize_rcu(); 141 return 0; 142 } 143 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 144 145 #endif 146 147 /* 148 * demultiplex raw sockets. 149 * (should consider queueing the skb in the sock receive_queue 150 * without calling rawv6.c) 151 * 152 * Caller owns SKB so we must make clones. 153 */ 154 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 155 { 156 struct in6_addr *saddr; 157 struct in6_addr *daddr; 158 struct sock *sk; 159 int delivered = 0; 160 __u8 hash; 161 struct net *net; 162 163 saddr = &ipv6_hdr(skb)->saddr; 164 daddr = saddr + 1; 165 166 hash = nexthdr & (MAX_INET_PROTOS - 1); 167 168 read_lock(&raw_v6_hashinfo.lock); 169 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 170 171 if (sk == NULL) 172 goto out; 173 174 net = dev_net(skb->dev); 175 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 176 177 while (sk) { 178 int filtered; 179 180 delivered = 1; 181 switch (nexthdr) { 182 case IPPROTO_ICMPV6: 183 filtered = icmpv6_filter(sk, skb); 184 break; 185 186 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 187 case IPPROTO_MH: 188 { 189 /* XXX: To validate MH only once for each packet, 190 * this is placed here. It should be after checking 191 * xfrm policy, however it doesn't. The checking xfrm 192 * policy is placed in rawv6_rcv() because it is 193 * required for each socket. 194 */ 195 int (*filter)(struct sock *sock, struct sk_buff *skb); 196 197 filter = rcu_dereference(mh_filter); 198 filtered = filter ? filter(sk, skb) : 0; 199 break; 200 } 201 #endif 202 default: 203 filtered = 0; 204 break; 205 } 206 207 if (filtered < 0) 208 break; 209 if (filtered == 0) { 210 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 211 212 /* Not releasing hash table! */ 213 if (clone) { 214 nf_reset(clone); 215 rawv6_rcv(sk, clone); 216 } 217 } 218 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 219 IP6CB(skb)->iif); 220 } 221 out: 222 read_unlock(&raw_v6_hashinfo.lock); 223 return delivered; 224 } 225 226 int raw6_local_deliver(struct sk_buff *skb, int nexthdr) 227 { 228 struct sock *raw_sk; 229 230 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]); 231 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 232 raw_sk = NULL; 233 234 return raw_sk != NULL; 235 } 236 237 /* This cleans up af_inet6 a bit. -DaveM */ 238 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 239 { 240 struct inet_sock *inet = inet_sk(sk); 241 struct ipv6_pinfo *np = inet6_sk(sk); 242 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 243 __be32 v4addr = 0; 244 int addr_type; 245 int err; 246 247 if (addr_len < SIN6_LEN_RFC2133) 248 return -EINVAL; 249 addr_type = ipv6_addr_type(&addr->sin6_addr); 250 251 /* Raw sockets are IPv6 only */ 252 if (addr_type == IPV6_ADDR_MAPPED) 253 return -EADDRNOTAVAIL; 254 255 lock_sock(sk); 256 257 err = -EINVAL; 258 if (sk->sk_state != TCP_CLOSE) 259 goto out; 260 261 rcu_read_lock(); 262 /* Check if the address belongs to the host. */ 263 if (addr_type != IPV6_ADDR_ANY) { 264 struct net_device *dev = NULL; 265 266 if (addr_type & IPV6_ADDR_LINKLOCAL) { 267 if (addr_len >= sizeof(struct sockaddr_in6) && 268 addr->sin6_scope_id) { 269 /* Override any existing binding, if another 270 * one is supplied by user. 271 */ 272 sk->sk_bound_dev_if = addr->sin6_scope_id; 273 } 274 275 /* Binding to link-local address requires an interface */ 276 if (!sk->sk_bound_dev_if) 277 goto out_unlock; 278 279 err = -ENODEV; 280 dev = dev_get_by_index_rcu(sock_net(sk), 281 sk->sk_bound_dev_if); 282 if (!dev) 283 goto out_unlock; 284 } 285 286 /* ipv4 addr of the socket is invalid. Only the 287 * unspecified and mapped address have a v4 equivalent. 288 */ 289 v4addr = LOOPBACK4_IPV6; 290 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 291 err = -EADDRNOTAVAIL; 292 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 293 dev, 0)) { 294 goto out_unlock; 295 } 296 } 297 } 298 299 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 300 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 301 if (!(addr_type & IPV6_ADDR_MULTICAST)) 302 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 303 err = 0; 304 out_unlock: 305 rcu_read_unlock(); 306 out: 307 release_sock(sk); 308 return err; 309 } 310 311 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 312 struct inet6_skb_parm *opt, 313 u8 type, u8 code, int offset, __be32 info) 314 { 315 struct inet_sock *inet = inet_sk(sk); 316 struct ipv6_pinfo *np = inet6_sk(sk); 317 int err; 318 int harderr; 319 320 /* Report error on raw socket, if: 321 1. User requested recverr. 322 2. Socket is connected (otherwise the error indication 323 is useless without recverr and error is hard. 324 */ 325 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 326 return; 327 328 harderr = icmpv6_err_convert(type, code, &err); 329 if (type == ICMPV6_PKT_TOOBIG) 330 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 331 332 if (np->recverr) { 333 u8 *payload = skb->data; 334 if (!inet->hdrincl) 335 payload += offset; 336 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 337 } 338 339 if (np->recverr || harderr) { 340 sk->sk_err = err; 341 sk->sk_error_report(sk); 342 } 343 } 344 345 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 346 u8 type, u8 code, int inner_offset, __be32 info) 347 { 348 struct sock *sk; 349 int hash; 350 struct in6_addr *saddr, *daddr; 351 struct net *net; 352 353 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 354 355 read_lock(&raw_v6_hashinfo.lock); 356 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 357 if (sk != NULL) { 358 /* Note: ipv6_hdr(skb) != skb->data */ 359 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 360 saddr = &ip6h->saddr; 361 daddr = &ip6h->daddr; 362 net = dev_net(skb->dev); 363 364 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 365 IP6CB(skb)->iif))) { 366 rawv6_err(sk, skb, NULL, type, code, 367 inner_offset, info); 368 sk = sk_next(sk); 369 } 370 } 371 read_unlock(&raw_v6_hashinfo.lock); 372 } 373 374 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 375 { 376 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 377 skb_checksum_complete(skb)) { 378 atomic_inc(&sk->sk_drops); 379 kfree_skb(skb); 380 return NET_RX_DROP; 381 } 382 383 /* Charge it to the socket. */ 384 if (sock_queue_rcv_skb(sk, skb) < 0) { 385 kfree_skb(skb); 386 return NET_RX_DROP; 387 } 388 389 return 0; 390 } 391 392 /* 393 * This is next to useless... 394 * if we demultiplex in network layer we don't need the extra call 395 * just to queue the skb... 396 * maybe we could have the network decide upon a hint if it 397 * should call raw_rcv for demultiplexing 398 */ 399 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 400 { 401 struct inet_sock *inet = inet_sk(sk); 402 struct raw6_sock *rp = raw6_sk(sk); 403 404 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 405 atomic_inc(&sk->sk_drops); 406 kfree_skb(skb); 407 return NET_RX_DROP; 408 } 409 410 if (!rp->checksum) 411 skb->ip_summed = CHECKSUM_UNNECESSARY; 412 413 if (skb->ip_summed == CHECKSUM_COMPLETE) { 414 skb_postpull_rcsum(skb, skb_network_header(skb), 415 skb_network_header_len(skb)); 416 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 417 &ipv6_hdr(skb)->daddr, 418 skb->len, inet->inet_num, skb->csum)) 419 skb->ip_summed = CHECKSUM_UNNECESSARY; 420 } 421 if (!skb_csum_unnecessary(skb)) 422 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 423 &ipv6_hdr(skb)->daddr, 424 skb->len, 425 inet->inet_num, 0)); 426 427 if (inet->hdrincl) { 428 if (skb_checksum_complete(skb)) { 429 atomic_inc(&sk->sk_drops); 430 kfree_skb(skb); 431 return NET_RX_DROP; 432 } 433 } 434 435 rawv6_rcv_skb(sk, skb); 436 return 0; 437 } 438 439 440 /* 441 * This should be easy, if there is something there 442 * we return it, otherwise we block. 443 */ 444 445 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 446 struct msghdr *msg, size_t len, 447 int noblock, int flags, int *addr_len) 448 { 449 struct ipv6_pinfo *np = inet6_sk(sk); 450 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 451 struct sk_buff *skb; 452 size_t copied; 453 int err; 454 455 if (flags & MSG_OOB) 456 return -EOPNOTSUPP; 457 458 if (addr_len) 459 *addr_len=sizeof(*sin6); 460 461 if (flags & MSG_ERRQUEUE) 462 return ipv6_recv_error(sk, msg, len); 463 464 skb = skb_recv_datagram(sk, flags, noblock, &err); 465 if (!skb) 466 goto out; 467 468 copied = skb->len; 469 if (copied > len) { 470 copied = len; 471 msg->msg_flags |= MSG_TRUNC; 472 } 473 474 if (skb_csum_unnecessary(skb)) { 475 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 476 } else if (msg->msg_flags&MSG_TRUNC) { 477 if (__skb_checksum_complete(skb)) 478 goto csum_copy_err; 479 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 480 } else { 481 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 482 if (err == -EINVAL) 483 goto csum_copy_err; 484 } 485 if (err) 486 goto out_free; 487 488 /* Copy the address. */ 489 if (sin6) { 490 sin6->sin6_family = AF_INET6; 491 sin6->sin6_port = 0; 492 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 493 sin6->sin6_flowinfo = 0; 494 sin6->sin6_scope_id = 0; 495 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 496 sin6->sin6_scope_id = IP6CB(skb)->iif; 497 } 498 499 sock_recv_ts_and_drops(msg, sk, skb); 500 501 if (np->rxopt.all) 502 datagram_recv_ctl(sk, msg, skb); 503 504 err = copied; 505 if (flags & MSG_TRUNC) 506 err = skb->len; 507 508 out_free: 509 skb_free_datagram(sk, skb); 510 out: 511 return err; 512 513 csum_copy_err: 514 skb_kill_datagram(sk, skb, flags); 515 516 /* Error for blocking case is chosen to masquerade 517 as some normal condition. 518 */ 519 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 520 goto out; 521 } 522 523 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 524 struct raw6_sock *rp) 525 { 526 struct sk_buff *skb; 527 int err = 0; 528 int offset; 529 int len; 530 int total_len; 531 __wsum tmp_csum; 532 __sum16 csum; 533 534 if (!rp->checksum) 535 goto send; 536 537 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 538 goto out; 539 540 offset = rp->offset; 541 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 542 skb->data); 543 if (offset >= total_len - 1) { 544 err = -EINVAL; 545 ip6_flush_pending_frames(sk); 546 goto out; 547 } 548 549 /* should be check HW csum miyazawa */ 550 if (skb_queue_len(&sk->sk_write_queue) == 1) { 551 /* 552 * Only one fragment on the socket. 553 */ 554 tmp_csum = skb->csum; 555 } else { 556 struct sk_buff *csum_skb = NULL; 557 tmp_csum = 0; 558 559 skb_queue_walk(&sk->sk_write_queue, skb) { 560 tmp_csum = csum_add(tmp_csum, skb->csum); 561 562 if (csum_skb) 563 continue; 564 565 len = skb->len - skb_transport_offset(skb); 566 if (offset >= len) { 567 offset -= len; 568 continue; 569 } 570 571 csum_skb = skb; 572 } 573 574 skb = csum_skb; 575 } 576 577 offset += skb_transport_offset(skb); 578 if (skb_copy_bits(skb, offset, &csum, 2)) 579 BUG(); 580 581 /* in case cksum was not initialized */ 582 if (unlikely(csum)) 583 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 584 585 csum = csum_ipv6_magic(&fl->fl6_src, 586 &fl->fl6_dst, 587 total_len, fl->proto, tmp_csum); 588 589 if (csum == 0 && fl->proto == IPPROTO_UDP) 590 csum = CSUM_MANGLED_0; 591 592 if (skb_store_bits(skb, offset, &csum, 2)) 593 BUG(); 594 595 send: 596 err = ip6_push_pending_frames(sk); 597 out: 598 return err; 599 } 600 601 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 602 struct flowi *fl, struct rt6_info *rt, 603 unsigned int flags) 604 { 605 struct ipv6_pinfo *np = inet6_sk(sk); 606 struct ipv6hdr *iph; 607 struct sk_buff *skb; 608 int err; 609 610 if (length > rt->u.dst.dev->mtu) { 611 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 612 return -EMSGSIZE; 613 } 614 if (flags&MSG_PROBE) 615 goto out; 616 617 skb = sock_alloc_send_skb(sk, 618 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, 619 flags & MSG_DONTWAIT, &err); 620 if (skb == NULL) 621 goto error; 622 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); 623 624 skb->priority = sk->sk_priority; 625 skb->mark = sk->sk_mark; 626 skb_dst_set(skb, dst_clone(&rt->u.dst)); 627 628 skb_put(skb, length); 629 skb_reset_network_header(skb); 630 iph = ipv6_hdr(skb); 631 632 skb->ip_summed = CHECKSUM_NONE; 633 634 skb->transport_header = skb->network_header; 635 err = memcpy_fromiovecend((void *)iph, from, 0, length); 636 if (err) 637 goto error_fault; 638 639 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 640 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 641 dst_output); 642 if (err > 0) 643 err = net_xmit_errno(err); 644 if (err) 645 goto error; 646 out: 647 return 0; 648 649 error_fault: 650 err = -EFAULT; 651 kfree_skb(skb); 652 error: 653 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 654 if (err == -ENOBUFS && !np->recverr) 655 err = 0; 656 return err; 657 } 658 659 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 660 { 661 struct iovec *iov; 662 u8 __user *type = NULL; 663 u8 __user *code = NULL; 664 u8 len = 0; 665 int probed = 0; 666 int i; 667 668 if (!msg->msg_iov) 669 return 0; 670 671 for (i = 0; i < msg->msg_iovlen; i++) { 672 iov = &msg->msg_iov[i]; 673 if (!iov) 674 continue; 675 676 switch (fl->proto) { 677 case IPPROTO_ICMPV6: 678 /* check if one-byte field is readable or not. */ 679 if (iov->iov_base && iov->iov_len < 1) 680 break; 681 682 if (!type) { 683 type = iov->iov_base; 684 /* check if code field is readable or not. */ 685 if (iov->iov_len > 1) 686 code = type + 1; 687 } else if (!code) 688 code = iov->iov_base; 689 690 if (type && code) { 691 if (get_user(fl->fl_icmp_type, type) || 692 get_user(fl->fl_icmp_code, code)) 693 return -EFAULT; 694 probed = 1; 695 } 696 break; 697 case IPPROTO_MH: 698 if (iov->iov_base && iov->iov_len < 1) 699 break; 700 /* check if type field is readable or not. */ 701 if (iov->iov_len > 2 - len) { 702 u8 __user *p = iov->iov_base; 703 if (get_user(fl->fl_mh_type, &p[2 - len])) 704 return -EFAULT; 705 probed = 1; 706 } else 707 len += iov->iov_len; 708 709 break; 710 default: 711 probed = 1; 712 break; 713 } 714 if (probed) 715 break; 716 } 717 return 0; 718 } 719 720 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 721 struct msghdr *msg, size_t len) 722 { 723 struct ipv6_txoptions opt_space; 724 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 725 struct in6_addr *daddr, *final_p = NULL, final; 726 struct inet_sock *inet = inet_sk(sk); 727 struct ipv6_pinfo *np = inet6_sk(sk); 728 struct raw6_sock *rp = raw6_sk(sk); 729 struct ipv6_txoptions *opt = NULL; 730 struct ip6_flowlabel *flowlabel = NULL; 731 struct dst_entry *dst = NULL; 732 struct flowi fl; 733 int addr_len = msg->msg_namelen; 734 int hlimit = -1; 735 int tclass = -1; 736 u16 proto; 737 int err; 738 739 /* Rough check on arithmetic overflow, 740 better check is made in ip6_append_data(). 741 */ 742 if (len > INT_MAX) 743 return -EMSGSIZE; 744 745 /* Mirror BSD error message compatibility */ 746 if (msg->msg_flags & MSG_OOB) 747 return -EOPNOTSUPP; 748 749 /* 750 * Get and verify the address. 751 */ 752 memset(&fl, 0, sizeof(fl)); 753 754 fl.mark = sk->sk_mark; 755 756 if (sin6) { 757 if (addr_len < SIN6_LEN_RFC2133) 758 return -EINVAL; 759 760 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 761 return(-EAFNOSUPPORT); 762 763 /* port is the proto value [0..255] carried in nexthdr */ 764 proto = ntohs(sin6->sin6_port); 765 766 if (!proto) 767 proto = inet->inet_num; 768 else if (proto != inet->inet_num) 769 return(-EINVAL); 770 771 if (proto > 255) 772 return(-EINVAL); 773 774 daddr = &sin6->sin6_addr; 775 if (np->sndflow) { 776 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 777 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 778 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 779 if (flowlabel == NULL) 780 return -EINVAL; 781 daddr = &flowlabel->dst; 782 } 783 } 784 785 /* 786 * Otherwise it will be difficult to maintain 787 * sk->sk_dst_cache. 788 */ 789 if (sk->sk_state == TCP_ESTABLISHED && 790 ipv6_addr_equal(daddr, &np->daddr)) 791 daddr = &np->daddr; 792 793 if (addr_len >= sizeof(struct sockaddr_in6) && 794 sin6->sin6_scope_id && 795 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 796 fl.oif = sin6->sin6_scope_id; 797 } else { 798 if (sk->sk_state != TCP_ESTABLISHED) 799 return -EDESTADDRREQ; 800 801 proto = inet->inet_num; 802 daddr = &np->daddr; 803 fl.fl6_flowlabel = np->flow_label; 804 } 805 806 if (fl.oif == 0) 807 fl.oif = sk->sk_bound_dev_if; 808 809 if (msg->msg_controllen) { 810 opt = &opt_space; 811 memset(opt, 0, sizeof(struct ipv6_txoptions)); 812 opt->tot_len = sizeof(struct ipv6_txoptions); 813 814 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 815 if (err < 0) { 816 fl6_sock_release(flowlabel); 817 return err; 818 } 819 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 820 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 821 if (flowlabel == NULL) 822 return -EINVAL; 823 } 824 if (!(opt->opt_nflen|opt->opt_flen)) 825 opt = NULL; 826 } 827 if (opt == NULL) 828 opt = np->opt; 829 if (flowlabel) 830 opt = fl6_merge_options(&opt_space, flowlabel, opt); 831 opt = ipv6_fixup_options(&opt_space, opt); 832 833 fl.proto = proto; 834 err = rawv6_probe_proto_opt(&fl, msg); 835 if (err) 836 goto out; 837 838 if (!ipv6_addr_any(daddr)) 839 ipv6_addr_copy(&fl.fl6_dst, daddr); 840 else 841 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 842 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 843 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 844 845 /* merge ip6_build_xmit from ip6_output */ 846 if (opt && opt->srcrt) { 847 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 848 ipv6_addr_copy(&final, &fl.fl6_dst); 849 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 850 final_p = &final; 851 } 852 853 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 854 fl.oif = np->mcast_oif; 855 security_sk_classify_flow(sk, &fl); 856 857 err = ip6_dst_lookup(sk, &dst, &fl); 858 if (err) 859 goto out; 860 if (final_p) 861 ipv6_addr_copy(&fl.fl6_dst, final_p); 862 863 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); 864 if (err < 0) { 865 if (err == -EREMOTE) 866 err = ip6_dst_blackhole(sk, &dst, &fl); 867 if (err < 0) 868 goto out; 869 } 870 871 if (hlimit < 0) { 872 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 873 hlimit = np->mcast_hops; 874 else 875 hlimit = np->hop_limit; 876 if (hlimit < 0) 877 hlimit = ip6_dst_hoplimit(dst); 878 } 879 880 if (tclass < 0) 881 tclass = np->tclass; 882 883 if (msg->msg_flags&MSG_CONFIRM) 884 goto do_confirm; 885 886 back_from_confirm: 887 if (inet->hdrincl) { 888 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 889 } else { 890 lock_sock(sk); 891 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 892 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 893 msg->msg_flags); 894 895 if (err) 896 ip6_flush_pending_frames(sk); 897 else if (!(msg->msg_flags & MSG_MORE)) 898 err = rawv6_push_pending_frames(sk, &fl, rp); 899 release_sock(sk); 900 } 901 done: 902 dst_release(dst); 903 out: 904 fl6_sock_release(flowlabel); 905 return err<0?err:len; 906 do_confirm: 907 dst_confirm(dst); 908 if (!(msg->msg_flags & MSG_PROBE) || len) 909 goto back_from_confirm; 910 err = 0; 911 goto done; 912 } 913 914 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 915 char __user *optval, int optlen) 916 { 917 switch (optname) { 918 case ICMPV6_FILTER: 919 if (optlen > sizeof(struct icmp6_filter)) 920 optlen = sizeof(struct icmp6_filter); 921 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 922 return -EFAULT; 923 return 0; 924 default: 925 return -ENOPROTOOPT; 926 } 927 928 return 0; 929 } 930 931 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 932 char __user *optval, int __user *optlen) 933 { 934 int len; 935 936 switch (optname) { 937 case ICMPV6_FILTER: 938 if (get_user(len, optlen)) 939 return -EFAULT; 940 if (len < 0) 941 return -EINVAL; 942 if (len > sizeof(struct icmp6_filter)) 943 len = sizeof(struct icmp6_filter); 944 if (put_user(len, optlen)) 945 return -EFAULT; 946 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 947 return -EFAULT; 948 return 0; 949 default: 950 return -ENOPROTOOPT; 951 } 952 953 return 0; 954 } 955 956 957 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 958 char __user *optval, unsigned int optlen) 959 { 960 struct raw6_sock *rp = raw6_sk(sk); 961 int val; 962 963 if (get_user(val, (int __user *)optval)) 964 return -EFAULT; 965 966 switch (optname) { 967 case IPV6_CHECKSUM: 968 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 969 level == IPPROTO_IPV6) { 970 /* 971 * RFC3542 tells that IPV6_CHECKSUM socket 972 * option in the IPPROTO_IPV6 level is not 973 * allowed on ICMPv6 sockets. 974 * If you want to set it, use IPPROTO_RAW 975 * level IPV6_CHECKSUM socket option 976 * (Linux extension). 977 */ 978 return -EINVAL; 979 } 980 981 /* You may get strange result with a positive odd offset; 982 RFC2292bis agrees with me. */ 983 if (val > 0 && (val&1)) 984 return(-EINVAL); 985 if (val < 0) { 986 rp->checksum = 0; 987 } else { 988 rp->checksum = 1; 989 rp->offset = val; 990 } 991 992 return 0; 993 break; 994 995 default: 996 return(-ENOPROTOOPT); 997 } 998 } 999 1000 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1001 char __user *optval, unsigned int optlen) 1002 { 1003 switch(level) { 1004 case SOL_RAW: 1005 break; 1006 1007 case SOL_ICMPV6: 1008 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1009 return -EOPNOTSUPP; 1010 return rawv6_seticmpfilter(sk, level, optname, optval, 1011 optlen); 1012 case SOL_IPV6: 1013 if (optname == IPV6_CHECKSUM) 1014 break; 1015 default: 1016 return ipv6_setsockopt(sk, level, optname, optval, 1017 optlen); 1018 } 1019 1020 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1021 } 1022 1023 #ifdef CONFIG_COMPAT 1024 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1025 char __user *optval, unsigned int optlen) 1026 { 1027 switch (level) { 1028 case SOL_RAW: 1029 break; 1030 case SOL_ICMPV6: 1031 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1032 return -EOPNOTSUPP; 1033 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1034 case SOL_IPV6: 1035 if (optname == IPV6_CHECKSUM) 1036 break; 1037 default: 1038 return compat_ipv6_setsockopt(sk, level, optname, 1039 optval, optlen); 1040 } 1041 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1042 } 1043 #endif 1044 1045 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1046 char __user *optval, int __user *optlen) 1047 { 1048 struct raw6_sock *rp = raw6_sk(sk); 1049 int val, len; 1050 1051 if (get_user(len,optlen)) 1052 return -EFAULT; 1053 1054 switch (optname) { 1055 case IPV6_CHECKSUM: 1056 /* 1057 * We allow getsockopt() for IPPROTO_IPV6-level 1058 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1059 * since RFC3542 is silent about it. 1060 */ 1061 if (rp->checksum == 0) 1062 val = -1; 1063 else 1064 val = rp->offset; 1065 break; 1066 1067 default: 1068 return -ENOPROTOOPT; 1069 } 1070 1071 len = min_t(unsigned int, sizeof(int), len); 1072 1073 if (put_user(len, optlen)) 1074 return -EFAULT; 1075 if (copy_to_user(optval,&val,len)) 1076 return -EFAULT; 1077 return 0; 1078 } 1079 1080 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1081 char __user *optval, int __user *optlen) 1082 { 1083 switch(level) { 1084 case SOL_RAW: 1085 break; 1086 1087 case SOL_ICMPV6: 1088 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1089 return -EOPNOTSUPP; 1090 return rawv6_geticmpfilter(sk, level, optname, optval, 1091 optlen); 1092 case SOL_IPV6: 1093 if (optname == IPV6_CHECKSUM) 1094 break; 1095 default: 1096 return ipv6_getsockopt(sk, level, optname, optval, 1097 optlen); 1098 } 1099 1100 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1101 } 1102 1103 #ifdef CONFIG_COMPAT 1104 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1105 char __user *optval, int __user *optlen) 1106 { 1107 switch (level) { 1108 case SOL_RAW: 1109 break; 1110 case SOL_ICMPV6: 1111 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1112 return -EOPNOTSUPP; 1113 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1114 case SOL_IPV6: 1115 if (optname == IPV6_CHECKSUM) 1116 break; 1117 default: 1118 return compat_ipv6_getsockopt(sk, level, optname, 1119 optval, optlen); 1120 } 1121 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1122 } 1123 #endif 1124 1125 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1126 { 1127 switch(cmd) { 1128 case SIOCOUTQ: 1129 { 1130 int amount = sk_wmem_alloc_get(sk); 1131 1132 return put_user(amount, (int __user *)arg); 1133 } 1134 case SIOCINQ: 1135 { 1136 struct sk_buff *skb; 1137 int amount = 0; 1138 1139 spin_lock_bh(&sk->sk_receive_queue.lock); 1140 skb = skb_peek(&sk->sk_receive_queue); 1141 if (skb != NULL) 1142 amount = skb->tail - skb->transport_header; 1143 spin_unlock_bh(&sk->sk_receive_queue.lock); 1144 return put_user(amount, (int __user *)arg); 1145 } 1146 1147 default: 1148 #ifdef CONFIG_IPV6_MROUTE 1149 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1150 #else 1151 return -ENOIOCTLCMD; 1152 #endif 1153 } 1154 } 1155 1156 static void rawv6_close(struct sock *sk, long timeout) 1157 { 1158 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1159 ip6_ra_control(sk, -1); 1160 ip6mr_sk_done(sk); 1161 sk_common_release(sk); 1162 } 1163 1164 static void raw6_destroy(struct sock *sk) 1165 { 1166 lock_sock(sk); 1167 ip6_flush_pending_frames(sk); 1168 release_sock(sk); 1169 1170 inet6_destroy_sock(sk); 1171 } 1172 1173 static int rawv6_init_sk(struct sock *sk) 1174 { 1175 struct raw6_sock *rp = raw6_sk(sk); 1176 1177 switch (inet_sk(sk)->inet_num) { 1178 case IPPROTO_ICMPV6: 1179 rp->checksum = 1; 1180 rp->offset = 2; 1181 break; 1182 case IPPROTO_MH: 1183 rp->checksum = 1; 1184 rp->offset = 4; 1185 break; 1186 default: 1187 break; 1188 } 1189 return(0); 1190 } 1191 1192 struct proto rawv6_prot = { 1193 .name = "RAWv6", 1194 .owner = THIS_MODULE, 1195 .close = rawv6_close, 1196 .destroy = raw6_destroy, 1197 .connect = ip6_datagram_connect, 1198 .disconnect = udp_disconnect, 1199 .ioctl = rawv6_ioctl, 1200 .init = rawv6_init_sk, 1201 .setsockopt = rawv6_setsockopt, 1202 .getsockopt = rawv6_getsockopt, 1203 .sendmsg = rawv6_sendmsg, 1204 .recvmsg = rawv6_recvmsg, 1205 .bind = rawv6_bind, 1206 .backlog_rcv = rawv6_rcv_skb, 1207 .hash = raw_hash_sk, 1208 .unhash = raw_unhash_sk, 1209 .obj_size = sizeof(struct raw6_sock), 1210 .h.raw_hash = &raw_v6_hashinfo, 1211 #ifdef CONFIG_COMPAT 1212 .compat_setsockopt = compat_rawv6_setsockopt, 1213 .compat_getsockopt = compat_rawv6_getsockopt, 1214 #endif 1215 }; 1216 1217 #ifdef CONFIG_PROC_FS 1218 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1219 { 1220 struct ipv6_pinfo *np = inet6_sk(sp); 1221 struct in6_addr *dest, *src; 1222 __u16 destp, srcp; 1223 1224 dest = &np->daddr; 1225 src = &np->rcv_saddr; 1226 destp = 0; 1227 srcp = inet_sk(sp)->inet_num; 1228 seq_printf(seq, 1229 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1230 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1231 i, 1232 src->s6_addr32[0], src->s6_addr32[1], 1233 src->s6_addr32[2], src->s6_addr32[3], srcp, 1234 dest->s6_addr32[0], dest->s6_addr32[1], 1235 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1236 sp->sk_state, 1237 sk_wmem_alloc_get(sp), 1238 sk_rmem_alloc_get(sp), 1239 0, 0L, 0, 1240 sock_i_uid(sp), 0, 1241 sock_i_ino(sp), 1242 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1243 } 1244 1245 static int raw6_seq_show(struct seq_file *seq, void *v) 1246 { 1247 if (v == SEQ_START_TOKEN) 1248 seq_printf(seq, 1249 " sl " 1250 "local_address " 1251 "remote_address " 1252 "st tx_queue rx_queue tr tm->when retrnsmt" 1253 " uid timeout inode ref pointer drops\n"); 1254 else 1255 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1256 return 0; 1257 } 1258 1259 static const struct seq_operations raw6_seq_ops = { 1260 .start = raw_seq_start, 1261 .next = raw_seq_next, 1262 .stop = raw_seq_stop, 1263 .show = raw6_seq_show, 1264 }; 1265 1266 static int raw6_seq_open(struct inode *inode, struct file *file) 1267 { 1268 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1269 } 1270 1271 static const struct file_operations raw6_seq_fops = { 1272 .owner = THIS_MODULE, 1273 .open = raw6_seq_open, 1274 .read = seq_read, 1275 .llseek = seq_lseek, 1276 .release = seq_release_net, 1277 }; 1278 1279 static int __net_init raw6_init_net(struct net *net) 1280 { 1281 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1282 return -ENOMEM; 1283 1284 return 0; 1285 } 1286 1287 static void __net_exit raw6_exit_net(struct net *net) 1288 { 1289 proc_net_remove(net, "raw6"); 1290 } 1291 1292 static struct pernet_operations raw6_net_ops = { 1293 .init = raw6_init_net, 1294 .exit = raw6_exit_net, 1295 }; 1296 1297 int __init raw6_proc_init(void) 1298 { 1299 return register_pernet_subsys(&raw6_net_ops); 1300 } 1301 1302 void raw6_proc_exit(void) 1303 { 1304 unregister_pernet_subsys(&raw6_net_ops); 1305 } 1306 #endif /* CONFIG_PROC_FS */ 1307 1308 /* Same as inet6_dgram_ops, sans udp_poll. */ 1309 static const struct proto_ops inet6_sockraw_ops = { 1310 .family = PF_INET6, 1311 .owner = THIS_MODULE, 1312 .release = inet6_release, 1313 .bind = inet6_bind, 1314 .connect = inet_dgram_connect, /* ok */ 1315 .socketpair = sock_no_socketpair, /* a do nothing */ 1316 .accept = sock_no_accept, /* a do nothing */ 1317 .getname = inet6_getname, 1318 .poll = datagram_poll, /* ok */ 1319 .ioctl = inet6_ioctl, /* must change */ 1320 .listen = sock_no_listen, /* ok */ 1321 .shutdown = inet_shutdown, /* ok */ 1322 .setsockopt = sock_common_setsockopt, /* ok */ 1323 .getsockopt = sock_common_getsockopt, /* ok */ 1324 .sendmsg = inet_sendmsg, /* ok */ 1325 .recvmsg = sock_common_recvmsg, /* ok */ 1326 .mmap = sock_no_mmap, 1327 .sendpage = sock_no_sendpage, 1328 #ifdef CONFIG_COMPAT 1329 .compat_setsockopt = compat_sock_common_setsockopt, 1330 .compat_getsockopt = compat_sock_common_getsockopt, 1331 #endif 1332 }; 1333 1334 static struct inet_protosw rawv6_protosw = { 1335 .type = SOCK_RAW, 1336 .protocol = IPPROTO_IP, /* wild card */ 1337 .prot = &rawv6_prot, 1338 .ops = &inet6_sockraw_ops, 1339 .no_check = UDP_CSUM_DEFAULT, 1340 .flags = INET_PROTOSW_REUSE, 1341 }; 1342 1343 int __init rawv6_init(void) 1344 { 1345 int ret; 1346 1347 ret = inet6_register_protosw(&rawv6_protosw); 1348 if (ret) 1349 goto out; 1350 out: 1351 return ret; 1352 } 1353 1354 void rawv6_exit(void) 1355 { 1356 inet6_unregister_protosw(&rawv6_protosw); 1357 } 1358