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)->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 /* Check if the address belongs to the host. */ 261 if (addr_type != IPV6_ADDR_ANY) { 262 struct net_device *dev = NULL; 263 264 if (addr_type & IPV6_ADDR_LINKLOCAL) { 265 if (addr_len >= sizeof(struct sockaddr_in6) && 266 addr->sin6_scope_id) { 267 /* Override any existing binding, if another 268 * one is supplied by user. 269 */ 270 sk->sk_bound_dev_if = addr->sin6_scope_id; 271 } 272 273 /* Binding to link-local address requires an interface */ 274 if (!sk->sk_bound_dev_if) 275 goto out; 276 277 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); 278 if (!dev) { 279 err = -ENODEV; 280 goto out; 281 } 282 } 283 284 /* ipv4 addr of the socket is invalid. Only the 285 * unspecified and mapped address have a v4 equivalent. 286 */ 287 v4addr = LOOPBACK4_IPV6; 288 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 289 err = -EADDRNOTAVAIL; 290 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 291 dev, 0)) { 292 if (dev) 293 dev_put(dev); 294 goto out; 295 } 296 } 297 if (dev) 298 dev_put(dev); 299 } 300 301 inet->rcv_saddr = inet->saddr = v4addr; 302 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 303 if (!(addr_type & IPV6_ADDR_MULTICAST)) 304 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 305 err = 0; 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 int type, int 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 int type, int 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 atomic_inc(&sk->sk_drops); 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->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->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 skb = skb_recv_datagram(sk, flags, noblock, &err); 466 if (!skb) 467 goto out; 468 469 copied = skb->len; 470 if (copied > len) { 471 copied = len; 472 msg->msg_flags |= MSG_TRUNC; 473 } 474 475 if (skb_csum_unnecessary(skb)) { 476 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 477 } else if (msg->msg_flags&MSG_TRUNC) { 478 if (__skb_checksum_complete(skb)) 479 goto csum_copy_err; 480 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 481 } else { 482 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 483 if (err == -EINVAL) 484 goto csum_copy_err; 485 } 486 if (err) 487 goto out_free; 488 489 /* Copy the address. */ 490 if (sin6) { 491 sin6->sin6_family = AF_INET6; 492 sin6->sin6_port = 0; 493 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 494 sin6->sin6_flowinfo = 0; 495 sin6->sin6_scope_id = 0; 496 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 497 sin6->sin6_scope_id = IP6CB(skb)->iif; 498 } 499 500 sock_recv_timestamp(msg, sk, skb); 501 502 if (np->rxopt.all) 503 datagram_recv_ctl(sk, msg, skb); 504 505 err = copied; 506 if (flags & MSG_TRUNC) 507 err = skb->len; 508 509 out_free: 510 skb_free_datagram(sk, skb); 511 out: 512 return err; 513 514 csum_copy_err: 515 skb_kill_datagram(sk, skb, flags); 516 517 /* Error for blocking case is chosen to masquerade 518 as some normal condition. 519 */ 520 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 521 atomic_inc(&sk->sk_drops); 522 goto out; 523 } 524 525 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 526 struct raw6_sock *rp) 527 { 528 struct sk_buff *skb; 529 int err = 0; 530 int offset; 531 int len; 532 int total_len; 533 __wsum tmp_csum; 534 __sum16 csum; 535 536 if (!rp->checksum) 537 goto send; 538 539 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 540 goto out; 541 542 offset = rp->offset; 543 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 544 skb->data); 545 if (offset >= total_len - 1) { 546 err = -EINVAL; 547 ip6_flush_pending_frames(sk); 548 goto out; 549 } 550 551 /* should be check HW csum miyazawa */ 552 if (skb_queue_len(&sk->sk_write_queue) == 1) { 553 /* 554 * Only one fragment on the socket. 555 */ 556 tmp_csum = skb->csum; 557 } else { 558 struct sk_buff *csum_skb = NULL; 559 tmp_csum = 0; 560 561 skb_queue_walk(&sk->sk_write_queue, skb) { 562 tmp_csum = csum_add(tmp_csum, skb->csum); 563 564 if (csum_skb) 565 continue; 566 567 len = skb->len - skb_transport_offset(skb); 568 if (offset >= len) { 569 offset -= len; 570 continue; 571 } 572 573 csum_skb = skb; 574 } 575 576 skb = csum_skb; 577 } 578 579 offset += skb_transport_offset(skb); 580 if (skb_copy_bits(skb, offset, &csum, 2)) 581 BUG(); 582 583 /* in case cksum was not initialized */ 584 if (unlikely(csum)) 585 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 586 587 csum = csum_ipv6_magic(&fl->fl6_src, 588 &fl->fl6_dst, 589 total_len, fl->proto, tmp_csum); 590 591 if (csum == 0 && fl->proto == IPPROTO_UDP) 592 csum = CSUM_MANGLED_0; 593 594 if (skb_store_bits(skb, offset, &csum, 2)) 595 BUG(); 596 597 send: 598 err = ip6_push_pending_frames(sk); 599 out: 600 return err; 601 } 602 603 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 604 struct flowi *fl, struct rt6_info *rt, 605 unsigned int flags) 606 { 607 struct ipv6_pinfo *np = inet6_sk(sk); 608 struct ipv6hdr *iph; 609 struct sk_buff *skb; 610 int err; 611 612 if (length > rt->u.dst.dev->mtu) { 613 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 614 return -EMSGSIZE; 615 } 616 if (flags&MSG_PROBE) 617 goto out; 618 619 skb = sock_alloc_send_skb(sk, 620 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, 621 flags & MSG_DONTWAIT, &err); 622 if (skb == NULL) 623 goto error; 624 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); 625 626 skb->priority = sk->sk_priority; 627 skb->mark = sk->sk_mark; 628 skb->dst = dst_clone(&rt->u.dst); 629 630 skb_put(skb, length); 631 skb_reset_network_header(skb); 632 iph = ipv6_hdr(skb); 633 634 skb->ip_summed = CHECKSUM_NONE; 635 636 skb->transport_header = skb->network_header; 637 err = memcpy_fromiovecend((void *)iph, from, 0, length); 638 if (err) 639 goto error_fault; 640 641 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 642 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 643 dst_output); 644 if (err > 0) 645 err = np->recverr ? net_xmit_errno(err) : 0; 646 if (err) 647 goto error; 648 out: 649 return 0; 650 651 error_fault: 652 err = -EFAULT; 653 kfree_skb(skb); 654 error: 655 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 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->num; 768 else if (proto != 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->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 if (tclass < 0) 883 tclass = 0; 884 } 885 886 if (msg->msg_flags&MSG_CONFIRM) 887 goto do_confirm; 888 889 back_from_confirm: 890 if (inet->hdrincl) { 891 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 892 } else { 893 lock_sock(sk); 894 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 895 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 896 msg->msg_flags); 897 898 if (err) 899 ip6_flush_pending_frames(sk); 900 else if (!(msg->msg_flags & MSG_MORE)) 901 err = rawv6_push_pending_frames(sk, &fl, rp); 902 release_sock(sk); 903 } 904 done: 905 dst_release(dst); 906 out: 907 fl6_sock_release(flowlabel); 908 return err<0?err:len; 909 do_confirm: 910 dst_confirm(dst); 911 if (!(msg->msg_flags & MSG_PROBE) || len) 912 goto back_from_confirm; 913 err = 0; 914 goto done; 915 } 916 917 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 918 char __user *optval, int optlen) 919 { 920 switch (optname) { 921 case ICMPV6_FILTER: 922 if (optlen > sizeof(struct icmp6_filter)) 923 optlen = sizeof(struct icmp6_filter); 924 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 925 return -EFAULT; 926 return 0; 927 default: 928 return -ENOPROTOOPT; 929 } 930 931 return 0; 932 } 933 934 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 935 char __user *optval, int __user *optlen) 936 { 937 int len; 938 939 switch (optname) { 940 case ICMPV6_FILTER: 941 if (get_user(len, optlen)) 942 return -EFAULT; 943 if (len < 0) 944 return -EINVAL; 945 if (len > sizeof(struct icmp6_filter)) 946 len = sizeof(struct icmp6_filter); 947 if (put_user(len, optlen)) 948 return -EFAULT; 949 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 950 return -EFAULT; 951 return 0; 952 default: 953 return -ENOPROTOOPT; 954 } 955 956 return 0; 957 } 958 959 960 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 961 char __user *optval, int optlen) 962 { 963 struct raw6_sock *rp = raw6_sk(sk); 964 int val; 965 966 if (get_user(val, (int __user *)optval)) 967 return -EFAULT; 968 969 switch (optname) { 970 case IPV6_CHECKSUM: 971 if (inet_sk(sk)->num == IPPROTO_ICMPV6 && 972 level == IPPROTO_IPV6) { 973 /* 974 * RFC3542 tells that IPV6_CHECKSUM socket 975 * option in the IPPROTO_IPV6 level is not 976 * allowed on ICMPv6 sockets. 977 * If you want to set it, use IPPROTO_RAW 978 * level IPV6_CHECKSUM socket option 979 * (Linux extension). 980 */ 981 return -EINVAL; 982 } 983 984 /* You may get strange result with a positive odd offset; 985 RFC2292bis agrees with me. */ 986 if (val > 0 && (val&1)) 987 return(-EINVAL); 988 if (val < 0) { 989 rp->checksum = 0; 990 } else { 991 rp->checksum = 1; 992 rp->offset = val; 993 } 994 995 return 0; 996 break; 997 998 default: 999 return(-ENOPROTOOPT); 1000 } 1001 } 1002 1003 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1004 char __user *optval, int optlen) 1005 { 1006 switch(level) { 1007 case SOL_RAW: 1008 break; 1009 1010 case SOL_ICMPV6: 1011 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1012 return -EOPNOTSUPP; 1013 return rawv6_seticmpfilter(sk, level, optname, optval, 1014 optlen); 1015 case SOL_IPV6: 1016 if (optname == IPV6_CHECKSUM) 1017 break; 1018 default: 1019 return ipv6_setsockopt(sk, level, optname, optval, 1020 optlen); 1021 } 1022 1023 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1024 } 1025 1026 #ifdef CONFIG_COMPAT 1027 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1028 char __user *optval, int optlen) 1029 { 1030 switch (level) { 1031 case SOL_RAW: 1032 break; 1033 case SOL_ICMPV6: 1034 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1035 return -EOPNOTSUPP; 1036 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1037 case SOL_IPV6: 1038 if (optname == IPV6_CHECKSUM) 1039 break; 1040 default: 1041 return compat_ipv6_setsockopt(sk, level, optname, 1042 optval, optlen); 1043 } 1044 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1045 } 1046 #endif 1047 1048 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1049 char __user *optval, int __user *optlen) 1050 { 1051 struct raw6_sock *rp = raw6_sk(sk); 1052 int val, len; 1053 1054 if (get_user(len,optlen)) 1055 return -EFAULT; 1056 1057 switch (optname) { 1058 case IPV6_CHECKSUM: 1059 /* 1060 * We allow getsockopt() for IPPROTO_IPV6-level 1061 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1062 * since RFC3542 is silent about it. 1063 */ 1064 if (rp->checksum == 0) 1065 val = -1; 1066 else 1067 val = rp->offset; 1068 break; 1069 1070 default: 1071 return -ENOPROTOOPT; 1072 } 1073 1074 len = min_t(unsigned int, sizeof(int), len); 1075 1076 if (put_user(len, optlen)) 1077 return -EFAULT; 1078 if (copy_to_user(optval,&val,len)) 1079 return -EFAULT; 1080 return 0; 1081 } 1082 1083 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1084 char __user *optval, int __user *optlen) 1085 { 1086 switch(level) { 1087 case SOL_RAW: 1088 break; 1089 1090 case SOL_ICMPV6: 1091 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1092 return -EOPNOTSUPP; 1093 return rawv6_geticmpfilter(sk, level, optname, optval, 1094 optlen); 1095 case SOL_IPV6: 1096 if (optname == IPV6_CHECKSUM) 1097 break; 1098 default: 1099 return ipv6_getsockopt(sk, level, optname, optval, 1100 optlen); 1101 } 1102 1103 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1104 } 1105 1106 #ifdef CONFIG_COMPAT 1107 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1108 char __user *optval, int __user *optlen) 1109 { 1110 switch (level) { 1111 case SOL_RAW: 1112 break; 1113 case SOL_ICMPV6: 1114 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1115 return -EOPNOTSUPP; 1116 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1117 case SOL_IPV6: 1118 if (optname == IPV6_CHECKSUM) 1119 break; 1120 default: 1121 return compat_ipv6_getsockopt(sk, level, optname, 1122 optval, optlen); 1123 } 1124 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1125 } 1126 #endif 1127 1128 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1129 { 1130 switch(cmd) { 1131 case SIOCOUTQ: 1132 { 1133 int amount = atomic_read(&sk->sk_wmem_alloc); 1134 return put_user(amount, (int __user *)arg); 1135 } 1136 case SIOCINQ: 1137 { 1138 struct sk_buff *skb; 1139 int amount = 0; 1140 1141 spin_lock_bh(&sk->sk_receive_queue.lock); 1142 skb = skb_peek(&sk->sk_receive_queue); 1143 if (skb != NULL) 1144 amount = skb->tail - skb->transport_header; 1145 spin_unlock_bh(&sk->sk_receive_queue.lock); 1146 return put_user(amount, (int __user *)arg); 1147 } 1148 1149 default: 1150 #ifdef CONFIG_IPV6_MROUTE 1151 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1152 #else 1153 return -ENOIOCTLCMD; 1154 #endif 1155 } 1156 } 1157 1158 static void rawv6_close(struct sock *sk, long timeout) 1159 { 1160 if (inet_sk(sk)->num == IPPROTO_RAW) 1161 ip6_ra_control(sk, -1); 1162 ip6mr_sk_done(sk); 1163 sk_common_release(sk); 1164 } 1165 1166 static void raw6_destroy(struct sock *sk) 1167 { 1168 lock_sock(sk); 1169 ip6_flush_pending_frames(sk); 1170 release_sock(sk); 1171 1172 inet6_destroy_sock(sk); 1173 } 1174 1175 static int rawv6_init_sk(struct sock *sk) 1176 { 1177 struct raw6_sock *rp = raw6_sk(sk); 1178 1179 switch (inet_sk(sk)->num) { 1180 case IPPROTO_ICMPV6: 1181 rp->checksum = 1; 1182 rp->offset = 2; 1183 break; 1184 case IPPROTO_MH: 1185 rp->checksum = 1; 1186 rp->offset = 4; 1187 break; 1188 default: 1189 break; 1190 } 1191 return(0); 1192 } 1193 1194 struct proto rawv6_prot = { 1195 .name = "RAWv6", 1196 .owner = THIS_MODULE, 1197 .close = rawv6_close, 1198 .destroy = raw6_destroy, 1199 .connect = ip6_datagram_connect, 1200 .disconnect = udp_disconnect, 1201 .ioctl = rawv6_ioctl, 1202 .init = rawv6_init_sk, 1203 .setsockopt = rawv6_setsockopt, 1204 .getsockopt = rawv6_getsockopt, 1205 .sendmsg = rawv6_sendmsg, 1206 .recvmsg = rawv6_recvmsg, 1207 .bind = rawv6_bind, 1208 .backlog_rcv = rawv6_rcv_skb, 1209 .hash = raw_hash_sk, 1210 .unhash = raw_unhash_sk, 1211 .obj_size = sizeof(struct raw6_sock), 1212 .h.raw_hash = &raw_v6_hashinfo, 1213 #ifdef CONFIG_COMPAT 1214 .compat_setsockopt = compat_rawv6_setsockopt, 1215 .compat_getsockopt = compat_rawv6_getsockopt, 1216 #endif 1217 }; 1218 1219 #ifdef CONFIG_PROC_FS 1220 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1221 { 1222 struct ipv6_pinfo *np = inet6_sk(sp); 1223 struct in6_addr *dest, *src; 1224 __u16 destp, srcp; 1225 1226 dest = &np->daddr; 1227 src = &np->rcv_saddr; 1228 destp = 0; 1229 srcp = inet_sk(sp)->num; 1230 seq_printf(seq, 1231 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1232 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1233 i, 1234 src->s6_addr32[0], src->s6_addr32[1], 1235 src->s6_addr32[2], src->s6_addr32[3], srcp, 1236 dest->s6_addr32[0], dest->s6_addr32[1], 1237 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1238 sp->sk_state, 1239 atomic_read(&sp->sk_wmem_alloc), 1240 atomic_read(&sp->sk_rmem_alloc), 1241 0, 0L, 0, 1242 sock_i_uid(sp), 0, 1243 sock_i_ino(sp), 1244 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1245 } 1246 1247 static int raw6_seq_show(struct seq_file *seq, void *v) 1248 { 1249 if (v == SEQ_START_TOKEN) 1250 seq_printf(seq, 1251 " sl " 1252 "local_address " 1253 "remote_address " 1254 "st tx_queue rx_queue tr tm->when retrnsmt" 1255 " uid timeout inode ref pointer drops\n"); 1256 else 1257 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1258 return 0; 1259 } 1260 1261 static const struct seq_operations raw6_seq_ops = { 1262 .start = raw_seq_start, 1263 .next = raw_seq_next, 1264 .stop = raw_seq_stop, 1265 .show = raw6_seq_show, 1266 }; 1267 1268 static int raw6_seq_open(struct inode *inode, struct file *file) 1269 { 1270 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1271 } 1272 1273 static const struct file_operations raw6_seq_fops = { 1274 .owner = THIS_MODULE, 1275 .open = raw6_seq_open, 1276 .read = seq_read, 1277 .llseek = seq_lseek, 1278 .release = seq_release_net, 1279 }; 1280 1281 static int raw6_init_net(struct net *net) 1282 { 1283 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1284 return -ENOMEM; 1285 1286 return 0; 1287 } 1288 1289 static void raw6_exit_net(struct net *net) 1290 { 1291 proc_net_remove(net, "raw6"); 1292 } 1293 1294 static struct pernet_operations raw6_net_ops = { 1295 .init = raw6_init_net, 1296 .exit = raw6_exit_net, 1297 }; 1298 1299 int __init raw6_proc_init(void) 1300 { 1301 return register_pernet_subsys(&raw6_net_ops); 1302 } 1303 1304 void raw6_proc_exit(void) 1305 { 1306 unregister_pernet_subsys(&raw6_net_ops); 1307 } 1308 #endif /* CONFIG_PROC_FS */ 1309 1310 /* Same as inet6_dgram_ops, sans udp_poll. */ 1311 static const struct proto_ops inet6_sockraw_ops = { 1312 .family = PF_INET6, 1313 .owner = THIS_MODULE, 1314 .release = inet6_release, 1315 .bind = inet6_bind, 1316 .connect = inet_dgram_connect, /* ok */ 1317 .socketpair = sock_no_socketpair, /* a do nothing */ 1318 .accept = sock_no_accept, /* a do nothing */ 1319 .getname = inet6_getname, 1320 .poll = datagram_poll, /* ok */ 1321 .ioctl = inet6_ioctl, /* must change */ 1322 .listen = sock_no_listen, /* ok */ 1323 .shutdown = inet_shutdown, /* ok */ 1324 .setsockopt = sock_common_setsockopt, /* ok */ 1325 .getsockopt = sock_common_getsockopt, /* ok */ 1326 .sendmsg = inet_sendmsg, /* ok */ 1327 .recvmsg = sock_common_recvmsg, /* ok */ 1328 .mmap = sock_no_mmap, 1329 .sendpage = sock_no_sendpage, 1330 #ifdef CONFIG_COMPAT 1331 .compat_setsockopt = compat_sock_common_setsockopt, 1332 .compat_getsockopt = compat_sock_common_getsockopt, 1333 #endif 1334 }; 1335 1336 static struct inet_protosw rawv6_protosw = { 1337 .type = SOCK_RAW, 1338 .protocol = IPPROTO_IP, /* wild card */ 1339 .prot = &rawv6_prot, 1340 .ops = &inet6_sockraw_ops, 1341 .capability = CAP_NET_RAW, 1342 .no_check = UDP_CSUM_DEFAULT, 1343 .flags = INET_PROTOSW_REUSE, 1344 }; 1345 1346 int __init rawv6_init(void) 1347 { 1348 int ret; 1349 1350 ret = inet6_register_protosw(&rawv6_protosw); 1351 if (ret) 1352 goto out; 1353 out: 1354 return ret; 1355 } 1356 1357 void rawv6_exit(void) 1358 { 1359 inet6_unregister_protosw(&rawv6_protosw); 1360 } 1361