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 * $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * Hideaki YOSHIFUJI : sin6_scope_id support 14 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) 15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/socket.h> 26 #include <linux/sockios.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/icmpv6.h> 32 #include <linux/netfilter.h> 33 #include <linux/netfilter_ipv6.h> 34 #include <linux/skbuff.h> 35 #include <asm/uaccess.h> 36 #include <asm/ioctls.h> 37 38 #include <net/net_namespace.h> 39 #include <net/ip.h> 40 #include <net/sock.h> 41 #include <net/snmp.h> 42 43 #include <net/ipv6.h> 44 #include <net/ndisc.h> 45 #include <net/protocol.h> 46 #include <net/ip6_route.h> 47 #include <net/ip6_checksum.h> 48 #include <net/addrconf.h> 49 #include <net/transp_v6.h> 50 #include <net/udp.h> 51 #include <net/inet_common.h> 52 #include <net/tcp_states.h> 53 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 54 #include <net/mip6.h> 55 #endif 56 #include <linux/mroute6.h> 57 58 #include <net/raw.h> 59 #include <net/rawv6.h> 60 #include <net/xfrm.h> 61 62 #include <linux/proc_fs.h> 63 #include <linux/seq_file.h> 64 65 static struct raw_hashinfo raw_v6_hashinfo = { 66 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 67 }; 68 69 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 70 unsigned short num, struct in6_addr *loc_addr, 71 struct in6_addr *rmt_addr, int dif) 72 { 73 struct hlist_node *node; 74 int is_multicast = ipv6_addr_is_multicast(loc_addr); 75 76 sk_for_each_from(sk, node) 77 if (inet_sk(sk)->num == num) { 78 struct ipv6_pinfo *np = inet6_sk(sk); 79 80 if (!net_eq(sock_net(sk), net)) 81 continue; 82 83 if (!ipv6_addr_any(&np->daddr) && 84 !ipv6_addr_equal(&np->daddr, rmt_addr)) 85 continue; 86 87 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 88 continue; 89 90 if (!ipv6_addr_any(&np->rcv_saddr)) { 91 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 92 goto found; 93 if (is_multicast && 94 inet6_mc_check(sk, loc_addr, rmt_addr)) 95 goto found; 96 continue; 97 } 98 goto found; 99 } 100 sk = NULL; 101 found: 102 return sk; 103 } 104 105 /* 106 * 0 - deliver 107 * 1 - block 108 */ 109 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 110 { 111 struct icmp6hdr *icmph; 112 struct raw6_sock *rp = raw6_sk(sk); 113 114 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 115 __u32 *data = &rp->filter.data[0]; 116 int bit_nr; 117 118 icmph = (struct icmp6hdr *) skb->data; 119 bit_nr = icmph->icmp6_type; 120 121 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 122 } 123 return 0; 124 } 125 126 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 127 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb); 128 129 int rawv6_mh_filter_register(int (*filter)(struct sock *sock, 130 struct sk_buff *skb)) 131 { 132 rcu_assign_pointer(mh_filter, filter); 133 return 0; 134 } 135 EXPORT_SYMBOL(rawv6_mh_filter_register); 136 137 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, 138 struct sk_buff *skb)) 139 { 140 rcu_assign_pointer(mh_filter, NULL); 141 synchronize_rcu(); 142 return 0; 143 } 144 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 145 146 #endif 147 148 /* 149 * demultiplex raw sockets. 150 * (should consider queueing the skb in the sock receive_queue 151 * without calling rawv6.c) 152 * 153 * Caller owns SKB so we must make clones. 154 */ 155 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 156 { 157 struct in6_addr *saddr; 158 struct in6_addr *daddr; 159 struct sock *sk; 160 int delivered = 0; 161 __u8 hash; 162 struct net *net; 163 164 saddr = &ipv6_hdr(skb)->saddr; 165 daddr = saddr + 1; 166 167 hash = nexthdr & (MAX_INET_PROTOS - 1); 168 169 read_lock(&raw_v6_hashinfo.lock); 170 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 171 172 if (sk == NULL) 173 goto out; 174 175 net = dev_net(skb->dev); 176 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 177 178 while (sk) { 179 int filtered; 180 181 delivered = 1; 182 switch (nexthdr) { 183 case IPPROTO_ICMPV6: 184 filtered = icmpv6_filter(sk, skb); 185 break; 186 187 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 188 case IPPROTO_MH: 189 { 190 /* XXX: To validate MH only once for each packet, 191 * this is placed here. It should be after checking 192 * xfrm policy, however it doesn't. The checking xfrm 193 * policy is placed in rawv6_rcv() because it is 194 * required for each socket. 195 */ 196 int (*filter)(struct sock *sock, struct sk_buff *skb); 197 198 filter = rcu_dereference(mh_filter); 199 filtered = filter ? filter(sk, skb) : 0; 200 break; 201 } 202 #endif 203 default: 204 filtered = 0; 205 break; 206 } 207 208 if (filtered < 0) 209 break; 210 if (filtered == 0) { 211 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 212 213 /* Not releasing hash table! */ 214 if (clone) { 215 nf_reset(clone); 216 rawv6_rcv(sk, clone); 217 } 218 } 219 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 220 IP6CB(skb)->iif); 221 } 222 out: 223 read_unlock(&raw_v6_hashinfo.lock); 224 return delivered; 225 } 226 227 int raw6_local_deliver(struct sk_buff *skb, int nexthdr) 228 { 229 struct sock *raw_sk; 230 231 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]); 232 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 233 raw_sk = NULL; 234 235 return raw_sk != NULL; 236 } 237 238 /* This cleans up af_inet6 a bit. -DaveM */ 239 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 240 { 241 struct inet_sock *inet = inet_sk(sk); 242 struct ipv6_pinfo *np = inet6_sk(sk); 243 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 244 __be32 v4addr = 0; 245 int addr_type; 246 int err; 247 248 if (addr_len < SIN6_LEN_RFC2133) 249 return -EINVAL; 250 addr_type = ipv6_addr_type(&addr->sin6_addr); 251 252 /* Raw sockets are IPv6 only */ 253 if (addr_type == IPV6_ADDR_MAPPED) 254 return(-EADDRNOTAVAIL); 255 256 lock_sock(sk); 257 258 err = -EINVAL; 259 if (sk->sk_state != TCP_CLOSE) 260 goto out; 261 262 /* 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; 278 279 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); 280 if (!dev) { 281 err = -ENODEV; 282 goto out; 283 } 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 if (dev) 295 dev_put(dev); 296 goto out; 297 } 298 } 299 if (dev) 300 dev_put(dev); 301 } 302 303 inet->rcv_saddr = inet->saddr = v4addr; 304 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 305 if (!(addr_type & IPV6_ADDR_MULTICAST)) 306 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 307 err = 0; 308 out: 309 release_sock(sk); 310 return err; 311 } 312 313 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 314 struct inet6_skb_parm *opt, 315 int type, int code, int offset, __be32 info) 316 { 317 struct inet_sock *inet = inet_sk(sk); 318 struct ipv6_pinfo *np = inet6_sk(sk); 319 int err; 320 int harderr; 321 322 /* Report error on raw socket, if: 323 1. User requested recverr. 324 2. Socket is connected (otherwise the error indication 325 is useless without recverr and error is hard. 326 */ 327 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 328 return; 329 330 harderr = icmpv6_err_convert(type, code, &err); 331 if (type == ICMPV6_PKT_TOOBIG) 332 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 333 334 if (np->recverr) { 335 u8 *payload = skb->data; 336 if (!inet->hdrincl) 337 payload += offset; 338 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 339 } 340 341 if (np->recverr || harderr) { 342 sk->sk_err = err; 343 sk->sk_error_report(sk); 344 } 345 } 346 347 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 348 int type, int code, int inner_offset, __be32 info) 349 { 350 struct sock *sk; 351 int hash; 352 struct in6_addr *saddr, *daddr; 353 struct net *net; 354 355 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 356 357 read_lock(&raw_v6_hashinfo.lock); 358 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 359 if (sk != NULL) { 360 /* Note: ipv6_hdr(skb) != skb->data */ 361 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 362 saddr = &ip6h->saddr; 363 daddr = &ip6h->daddr; 364 net = dev_net(skb->dev); 365 366 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 367 IP6CB(skb)->iif))) { 368 rawv6_err(sk, skb, NULL, type, code, 369 inner_offset, info); 370 sk = sk_next(sk); 371 } 372 } 373 read_unlock(&raw_v6_hashinfo.lock); 374 } 375 376 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 377 { 378 if ((raw6_sk(sk)->checksum || sk->sk_filter) && 379 skb_checksum_complete(skb)) { 380 atomic_inc(&sk->sk_drops); 381 kfree_skb(skb); 382 return 0; 383 } 384 385 /* Charge it to the socket. */ 386 if (sock_queue_rcv_skb(sk,skb)<0) { 387 atomic_inc(&sk->sk_drops); 388 kfree_skb(skb); 389 return 0; 390 } 391 392 return 0; 393 } 394 395 /* 396 * This is next to useless... 397 * if we demultiplex in network layer we don't need the extra call 398 * just to queue the skb... 399 * maybe we could have the network decide upon a hint if it 400 * should call raw_rcv for demultiplexing 401 */ 402 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 403 { 404 struct inet_sock *inet = inet_sk(sk); 405 struct raw6_sock *rp = raw6_sk(sk); 406 407 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 408 atomic_inc(&sk->sk_drops); 409 kfree_skb(skb); 410 return NET_RX_DROP; 411 } 412 413 if (!rp->checksum) 414 skb->ip_summed = CHECKSUM_UNNECESSARY; 415 416 if (skb->ip_summed == CHECKSUM_COMPLETE) { 417 skb_postpull_rcsum(skb, skb_network_header(skb), 418 skb_network_header_len(skb)); 419 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 420 &ipv6_hdr(skb)->daddr, 421 skb->len, inet->num, skb->csum)) 422 skb->ip_summed = CHECKSUM_UNNECESSARY; 423 } 424 if (!skb_csum_unnecessary(skb)) 425 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 426 &ipv6_hdr(skb)->daddr, 427 skb->len, 428 inet->num, 0)); 429 430 if (inet->hdrincl) { 431 if (skb_checksum_complete(skb)) { 432 atomic_inc(&sk->sk_drops); 433 kfree_skb(skb); 434 return 0; 435 } 436 } 437 438 rawv6_rcv_skb(sk, skb); 439 return 0; 440 } 441 442 443 /* 444 * This should be easy, if there is something there 445 * we return it, otherwise we block. 446 */ 447 448 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 449 struct msghdr *msg, size_t len, 450 int noblock, int flags, int *addr_len) 451 { 452 struct ipv6_pinfo *np = inet6_sk(sk); 453 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 454 struct sk_buff *skb; 455 size_t copied; 456 int err; 457 458 if (flags & MSG_OOB) 459 return -EOPNOTSUPP; 460 461 if (addr_len) 462 *addr_len=sizeof(*sin6); 463 464 if (flags & MSG_ERRQUEUE) 465 return ipv6_recv_error(sk, msg, len); 466 467 skb = skb_recv_datagram(sk, flags, noblock, &err); 468 if (!skb) 469 goto out; 470 471 copied = skb->len; 472 if (copied > len) { 473 copied = len; 474 msg->msg_flags |= MSG_TRUNC; 475 } 476 477 if (skb_csum_unnecessary(skb)) { 478 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 479 } else if (msg->msg_flags&MSG_TRUNC) { 480 if (__skb_checksum_complete(skb)) 481 goto csum_copy_err; 482 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 483 } else { 484 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 485 if (err == -EINVAL) 486 goto csum_copy_err; 487 } 488 if (err) 489 goto out_free; 490 491 /* Copy the address. */ 492 if (sin6) { 493 sin6->sin6_family = AF_INET6; 494 sin6->sin6_port = 0; 495 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 496 sin6->sin6_flowinfo = 0; 497 sin6->sin6_scope_id = 0; 498 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 499 sin6->sin6_scope_id = IP6CB(skb)->iif; 500 } 501 502 sock_recv_timestamp(msg, sk, skb); 503 504 if (np->rxopt.all) 505 datagram_recv_ctl(sk, msg, skb); 506 507 err = copied; 508 if (flags & MSG_TRUNC) 509 err = skb->len; 510 511 out_free: 512 skb_free_datagram(sk, skb); 513 out: 514 return err; 515 516 csum_copy_err: 517 skb_kill_datagram(sk, skb, flags); 518 519 /* Error for blocking case is chosen to masquerade 520 as some normal condition. 521 */ 522 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 523 atomic_inc(&sk->sk_drops); 524 goto out; 525 } 526 527 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, 528 struct raw6_sock *rp) 529 { 530 struct sk_buff *skb; 531 int err = 0; 532 int offset; 533 int len; 534 int total_len; 535 __wsum tmp_csum; 536 __sum16 csum; 537 538 if (!rp->checksum) 539 goto send; 540 541 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 542 goto out; 543 544 offset = rp->offset; 545 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) - 546 skb->data); 547 if (offset >= total_len - 1) { 548 err = -EINVAL; 549 ip6_flush_pending_frames(sk); 550 goto out; 551 } 552 553 /* should be check HW csum miyazawa */ 554 if (skb_queue_len(&sk->sk_write_queue) == 1) { 555 /* 556 * Only one fragment on the socket. 557 */ 558 tmp_csum = skb->csum; 559 } else { 560 struct sk_buff *csum_skb = NULL; 561 tmp_csum = 0; 562 563 skb_queue_walk(&sk->sk_write_queue, skb) { 564 tmp_csum = csum_add(tmp_csum, skb->csum); 565 566 if (csum_skb) 567 continue; 568 569 len = skb->len - skb_transport_offset(skb); 570 if (offset >= len) { 571 offset -= len; 572 continue; 573 } 574 575 csum_skb = skb; 576 } 577 578 skb = csum_skb; 579 } 580 581 offset += skb_transport_offset(skb); 582 if (skb_copy_bits(skb, offset, &csum, 2)) 583 BUG(); 584 585 /* in case cksum was not initialized */ 586 if (unlikely(csum)) 587 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 588 589 csum = csum_ipv6_magic(&fl->fl6_src, 590 &fl->fl6_dst, 591 total_len, fl->proto, tmp_csum); 592 593 if (csum == 0 && fl->proto == IPPROTO_UDP) 594 csum = CSUM_MANGLED_0; 595 596 if (skb_store_bits(skb, offset, &csum, 2)) 597 BUG(); 598 599 send: 600 err = ip6_push_pending_frames(sk); 601 out: 602 return err; 603 } 604 605 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 606 struct flowi *fl, struct rt6_info *rt, 607 unsigned int flags) 608 { 609 struct ipv6_pinfo *np = inet6_sk(sk); 610 struct ipv6hdr *iph; 611 struct sk_buff *skb; 612 int err; 613 614 if (length > rt->u.dst.dev->mtu) { 615 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 616 return -EMSGSIZE; 617 } 618 if (flags&MSG_PROBE) 619 goto out; 620 621 skb = sock_alloc_send_skb(sk, 622 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, 623 flags & MSG_DONTWAIT, &err); 624 if (skb == NULL) 625 goto error; 626 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); 627 628 skb->priority = sk->sk_priority; 629 skb->mark = sk->sk_mark; 630 skb->dst = dst_clone(&rt->u.dst); 631 632 skb_put(skb, length); 633 skb_reset_network_header(skb); 634 iph = ipv6_hdr(skb); 635 636 skb->ip_summed = CHECKSUM_NONE; 637 638 skb->transport_header = skb->network_header; 639 err = memcpy_fromiovecend((void *)iph, from, 0, length); 640 if (err) 641 goto error_fault; 642 643 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 644 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 645 dst_output); 646 if (err > 0) 647 err = np->recverr ? net_xmit_errno(err) : 0; 648 if (err) 649 goto error; 650 out: 651 return 0; 652 653 error_fault: 654 err = -EFAULT; 655 kfree_skb(skb); 656 error: 657 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 658 return err; 659 } 660 661 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 662 { 663 struct iovec *iov; 664 u8 __user *type = NULL; 665 u8 __user *code = NULL; 666 u8 len = 0; 667 int probed = 0; 668 int i; 669 670 if (!msg->msg_iov) 671 return 0; 672 673 for (i = 0; i < msg->msg_iovlen; i++) { 674 iov = &msg->msg_iov[i]; 675 if (!iov) 676 continue; 677 678 switch (fl->proto) { 679 case IPPROTO_ICMPV6: 680 /* check if one-byte field is readable or not. */ 681 if (iov->iov_base && iov->iov_len < 1) 682 break; 683 684 if (!type) { 685 type = iov->iov_base; 686 /* check if code field is readable or not. */ 687 if (iov->iov_len > 1) 688 code = type + 1; 689 } else if (!code) 690 code = iov->iov_base; 691 692 if (type && code) { 693 if (get_user(fl->fl_icmp_type, type) || 694 get_user(fl->fl_icmp_code, code)) 695 return -EFAULT; 696 probed = 1; 697 } 698 break; 699 case IPPROTO_MH: 700 if (iov->iov_base && iov->iov_len < 1) 701 break; 702 /* check if type field is readable or not. */ 703 if (iov->iov_len > 2 - len) { 704 u8 __user *p = iov->iov_base; 705 if (get_user(fl->fl_mh_type, &p[2 - len])) 706 return -EFAULT; 707 probed = 1; 708 } else 709 len += iov->iov_len; 710 711 break; 712 default: 713 probed = 1; 714 break; 715 } 716 if (probed) 717 break; 718 } 719 return 0; 720 } 721 722 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 723 struct msghdr *msg, size_t len) 724 { 725 struct ipv6_txoptions opt_space; 726 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 727 struct in6_addr *daddr, *final_p = NULL, final; 728 struct inet_sock *inet = inet_sk(sk); 729 struct ipv6_pinfo *np = inet6_sk(sk); 730 struct raw6_sock *rp = raw6_sk(sk); 731 struct ipv6_txoptions *opt = NULL; 732 struct ip6_flowlabel *flowlabel = NULL; 733 struct dst_entry *dst = NULL; 734 struct flowi fl; 735 int addr_len = msg->msg_namelen; 736 int hlimit = -1; 737 int tclass = -1; 738 u16 proto; 739 int err; 740 741 /* Rough check on arithmetic overflow, 742 better check is made in ip6_append_data(). 743 */ 744 if (len > INT_MAX) 745 return -EMSGSIZE; 746 747 /* Mirror BSD error message compatibility */ 748 if (msg->msg_flags & MSG_OOB) 749 return -EOPNOTSUPP; 750 751 /* 752 * Get and verify the address. 753 */ 754 memset(&fl, 0, sizeof(fl)); 755 756 fl.mark = sk->sk_mark; 757 758 if (sin6) { 759 if (addr_len < SIN6_LEN_RFC2133) 760 return -EINVAL; 761 762 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 763 return(-EAFNOSUPPORT); 764 765 /* port is the proto value [0..255] carried in nexthdr */ 766 proto = ntohs(sin6->sin6_port); 767 768 if (!proto) 769 proto = inet->num; 770 else if (proto != inet->num) 771 return(-EINVAL); 772 773 if (proto > 255) 774 return(-EINVAL); 775 776 daddr = &sin6->sin6_addr; 777 if (np->sndflow) { 778 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 779 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 780 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 781 if (flowlabel == NULL) 782 return -EINVAL; 783 daddr = &flowlabel->dst; 784 } 785 } 786 787 /* 788 * Otherwise it will be difficult to maintain 789 * sk->sk_dst_cache. 790 */ 791 if (sk->sk_state == TCP_ESTABLISHED && 792 ipv6_addr_equal(daddr, &np->daddr)) 793 daddr = &np->daddr; 794 795 if (addr_len >= sizeof(struct sockaddr_in6) && 796 sin6->sin6_scope_id && 797 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 798 fl.oif = sin6->sin6_scope_id; 799 } else { 800 if (sk->sk_state != TCP_ESTABLISHED) 801 return -EDESTADDRREQ; 802 803 proto = inet->num; 804 daddr = &np->daddr; 805 fl.fl6_flowlabel = np->flow_label; 806 } 807 808 if (fl.oif == 0) 809 fl.oif = sk->sk_bound_dev_if; 810 811 if (msg->msg_controllen) { 812 opt = &opt_space; 813 memset(opt, 0, sizeof(struct ipv6_txoptions)); 814 opt->tot_len = sizeof(struct ipv6_txoptions); 815 816 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); 817 if (err < 0) { 818 fl6_sock_release(flowlabel); 819 return err; 820 } 821 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 822 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 823 if (flowlabel == NULL) 824 return -EINVAL; 825 } 826 if (!(opt->opt_nflen|opt->opt_flen)) 827 opt = NULL; 828 } 829 if (opt == NULL) 830 opt = np->opt; 831 if (flowlabel) 832 opt = fl6_merge_options(&opt_space, flowlabel, opt); 833 opt = ipv6_fixup_options(&opt_space, opt); 834 835 fl.proto = proto; 836 err = rawv6_probe_proto_opt(&fl, msg); 837 if (err) 838 goto out; 839 840 if (!ipv6_addr_any(daddr)) 841 ipv6_addr_copy(&fl.fl6_dst, daddr); 842 else 843 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 844 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 845 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 846 847 /* merge ip6_build_xmit from ip6_output */ 848 if (opt && opt->srcrt) { 849 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 850 ipv6_addr_copy(&final, &fl.fl6_dst); 851 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 852 final_p = &final; 853 } 854 855 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 856 fl.oif = np->mcast_oif; 857 security_sk_classify_flow(sk, &fl); 858 859 err = ip6_dst_lookup(sk, &dst, &fl); 860 if (err) 861 goto out; 862 if (final_p) 863 ipv6_addr_copy(&fl.fl6_dst, final_p); 864 865 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { 866 if (err == -EREMOTE) 867 err = ip6_dst_blackhole(sk, &dst, &fl); 868 if (err < 0) 869 goto out; 870 } 871 872 if (hlimit < 0) { 873 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 874 hlimit = np->mcast_hops; 875 else 876 hlimit = np->hop_limit; 877 if (hlimit < 0) 878 hlimit = ip6_dst_hoplimit(dst); 879 } 880 881 if (tclass < 0) { 882 tclass = np->tclass; 883 if (tclass < 0) 884 tclass = 0; 885 } 886 887 if (msg->msg_flags&MSG_CONFIRM) 888 goto do_confirm; 889 890 back_from_confirm: 891 if (inet->hdrincl) { 892 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 893 } else { 894 lock_sock(sk); 895 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 896 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 897 msg->msg_flags); 898 899 if (err) 900 ip6_flush_pending_frames(sk); 901 else if (!(msg->msg_flags & MSG_MORE)) 902 err = rawv6_push_pending_frames(sk, &fl, rp); 903 release_sock(sk); 904 } 905 done: 906 dst_release(dst); 907 out: 908 fl6_sock_release(flowlabel); 909 return err<0?err:len; 910 do_confirm: 911 dst_confirm(dst); 912 if (!(msg->msg_flags & MSG_PROBE) || len) 913 goto back_from_confirm; 914 err = 0; 915 goto done; 916 } 917 918 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 919 char __user *optval, int optlen) 920 { 921 switch (optname) { 922 case ICMPV6_FILTER: 923 if (optlen > sizeof(struct icmp6_filter)) 924 optlen = sizeof(struct icmp6_filter); 925 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 926 return -EFAULT; 927 return 0; 928 default: 929 return -ENOPROTOOPT; 930 } 931 932 return 0; 933 } 934 935 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 936 char __user *optval, int __user *optlen) 937 { 938 int len; 939 940 switch (optname) { 941 case ICMPV6_FILTER: 942 if (get_user(len, optlen)) 943 return -EFAULT; 944 if (len < 0) 945 return -EINVAL; 946 if (len > sizeof(struct icmp6_filter)) 947 len = sizeof(struct icmp6_filter); 948 if (put_user(len, optlen)) 949 return -EFAULT; 950 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 951 return -EFAULT; 952 return 0; 953 default: 954 return -ENOPROTOOPT; 955 } 956 957 return 0; 958 } 959 960 961 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 962 char __user *optval, int optlen) 963 { 964 struct raw6_sock *rp = raw6_sk(sk); 965 int val; 966 967 if (get_user(val, (int __user *)optval)) 968 return -EFAULT; 969 970 switch (optname) { 971 case IPV6_CHECKSUM: 972 if (inet_sk(sk)->num == IPPROTO_ICMPV6 && 973 level == IPPROTO_IPV6) { 974 /* 975 * RFC3542 tells that IPV6_CHECKSUM socket 976 * option in the IPPROTO_IPV6 level is not 977 * allowed on ICMPv6 sockets. 978 * If you want to set it, use IPPROTO_RAW 979 * level IPV6_CHECKSUM socket option 980 * (Linux extension). 981 */ 982 return -EINVAL; 983 } 984 985 /* You may get strange result with a positive odd offset; 986 RFC2292bis agrees with me. */ 987 if (val > 0 && (val&1)) 988 return(-EINVAL); 989 if (val < 0) { 990 rp->checksum = 0; 991 } else { 992 rp->checksum = 1; 993 rp->offset = val; 994 } 995 996 return 0; 997 break; 998 999 default: 1000 return(-ENOPROTOOPT); 1001 } 1002 } 1003 1004 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1005 char __user *optval, int optlen) 1006 { 1007 switch(level) { 1008 case SOL_RAW: 1009 break; 1010 1011 case SOL_ICMPV6: 1012 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1013 return -EOPNOTSUPP; 1014 return rawv6_seticmpfilter(sk, level, optname, optval, 1015 optlen); 1016 case SOL_IPV6: 1017 if (optname == IPV6_CHECKSUM) 1018 break; 1019 default: 1020 return ipv6_setsockopt(sk, level, optname, optval, 1021 optlen); 1022 } 1023 1024 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1025 } 1026 1027 #ifdef CONFIG_COMPAT 1028 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1029 char __user *optval, int optlen) 1030 { 1031 switch (level) { 1032 case SOL_RAW: 1033 break; 1034 case SOL_ICMPV6: 1035 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1036 return -EOPNOTSUPP; 1037 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1038 case SOL_IPV6: 1039 if (optname == IPV6_CHECKSUM) 1040 break; 1041 default: 1042 return compat_ipv6_setsockopt(sk, level, optname, 1043 optval, optlen); 1044 } 1045 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1046 } 1047 #endif 1048 1049 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1050 char __user *optval, int __user *optlen) 1051 { 1052 struct raw6_sock *rp = raw6_sk(sk); 1053 int val, len; 1054 1055 if (get_user(len,optlen)) 1056 return -EFAULT; 1057 1058 switch (optname) { 1059 case IPV6_CHECKSUM: 1060 /* 1061 * We allow getsockopt() for IPPROTO_IPV6-level 1062 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1063 * since RFC3542 is silent about it. 1064 */ 1065 if (rp->checksum == 0) 1066 val = -1; 1067 else 1068 val = rp->offset; 1069 break; 1070 1071 default: 1072 return -ENOPROTOOPT; 1073 } 1074 1075 len = min_t(unsigned int, sizeof(int), len); 1076 1077 if (put_user(len, optlen)) 1078 return -EFAULT; 1079 if (copy_to_user(optval,&val,len)) 1080 return -EFAULT; 1081 return 0; 1082 } 1083 1084 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1085 char __user *optval, int __user *optlen) 1086 { 1087 switch(level) { 1088 case SOL_RAW: 1089 break; 1090 1091 case SOL_ICMPV6: 1092 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1093 return -EOPNOTSUPP; 1094 return rawv6_geticmpfilter(sk, level, optname, optval, 1095 optlen); 1096 case SOL_IPV6: 1097 if (optname == IPV6_CHECKSUM) 1098 break; 1099 default: 1100 return ipv6_getsockopt(sk, level, optname, optval, 1101 optlen); 1102 } 1103 1104 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1105 } 1106 1107 #ifdef CONFIG_COMPAT 1108 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1109 char __user *optval, int __user *optlen) 1110 { 1111 switch (level) { 1112 case SOL_RAW: 1113 break; 1114 case SOL_ICMPV6: 1115 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1116 return -EOPNOTSUPP; 1117 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1118 case SOL_IPV6: 1119 if (optname == IPV6_CHECKSUM) 1120 break; 1121 default: 1122 return compat_ipv6_getsockopt(sk, level, optname, 1123 optval, optlen); 1124 } 1125 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1126 } 1127 #endif 1128 1129 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1130 { 1131 switch(cmd) { 1132 case SIOCOUTQ: 1133 { 1134 int amount = atomic_read(&sk->sk_wmem_alloc); 1135 return put_user(amount, (int __user *)arg); 1136 } 1137 case SIOCINQ: 1138 { 1139 struct sk_buff *skb; 1140 int amount = 0; 1141 1142 spin_lock_bh(&sk->sk_receive_queue.lock); 1143 skb = skb_peek(&sk->sk_receive_queue); 1144 if (skb != NULL) 1145 amount = skb->tail - skb->transport_header; 1146 spin_unlock_bh(&sk->sk_receive_queue.lock); 1147 return put_user(amount, (int __user *)arg); 1148 } 1149 1150 default: 1151 #ifdef CONFIG_IPV6_MROUTE 1152 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1153 #else 1154 return -ENOIOCTLCMD; 1155 #endif 1156 } 1157 } 1158 1159 static void rawv6_close(struct sock *sk, long timeout) 1160 { 1161 if (inet_sk(sk)->num == IPPROTO_RAW) 1162 ip6_ra_control(sk, -1, NULL); 1163 ip6mr_sk_done(sk); 1164 sk_common_release(sk); 1165 } 1166 1167 static int raw6_destroy(struct sock *sk) 1168 { 1169 lock_sock(sk); 1170 ip6_flush_pending_frames(sk); 1171 release_sock(sk); 1172 return 0; 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 .destroy = inet6_destroy_sock, 1204 .setsockopt = rawv6_setsockopt, 1205 .getsockopt = rawv6_getsockopt, 1206 .sendmsg = rawv6_sendmsg, 1207 .recvmsg = rawv6_recvmsg, 1208 .bind = rawv6_bind, 1209 .backlog_rcv = rawv6_rcv_skb, 1210 .hash = raw_hash_sk, 1211 .unhash = raw_unhash_sk, 1212 .obj_size = sizeof(struct raw6_sock), 1213 .h.raw_hash = &raw_v6_hashinfo, 1214 #ifdef CONFIG_COMPAT 1215 .compat_setsockopt = compat_rawv6_setsockopt, 1216 .compat_getsockopt = compat_rawv6_getsockopt, 1217 #endif 1218 }; 1219 1220 #ifdef CONFIG_PROC_FS 1221 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1222 { 1223 struct ipv6_pinfo *np = inet6_sk(sp); 1224 struct in6_addr *dest, *src; 1225 __u16 destp, srcp; 1226 1227 dest = &np->daddr; 1228 src = &np->rcv_saddr; 1229 destp = 0; 1230 srcp = inet_sk(sp)->num; 1231 seq_printf(seq, 1232 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1233 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1234 i, 1235 src->s6_addr32[0], src->s6_addr32[1], 1236 src->s6_addr32[2], src->s6_addr32[3], srcp, 1237 dest->s6_addr32[0], dest->s6_addr32[1], 1238 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1239 sp->sk_state, 1240 atomic_read(&sp->sk_wmem_alloc), 1241 atomic_read(&sp->sk_rmem_alloc), 1242 0, 0L, 0, 1243 sock_i_uid(sp), 0, 1244 sock_i_ino(sp), 1245 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1246 } 1247 1248 static int raw6_seq_show(struct seq_file *seq, void *v) 1249 { 1250 if (v == SEQ_START_TOKEN) 1251 seq_printf(seq, 1252 " sl " 1253 "local_address " 1254 "remote_address " 1255 "st tx_queue rx_queue tr tm->when retrnsmt" 1256 " uid timeout inode drops\n"); 1257 else 1258 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1259 return 0; 1260 } 1261 1262 static const struct seq_operations raw6_seq_ops = { 1263 .start = raw_seq_start, 1264 .next = raw_seq_next, 1265 .stop = raw_seq_stop, 1266 .show = raw6_seq_show, 1267 }; 1268 1269 static int raw6_seq_open(struct inode *inode, struct file *file) 1270 { 1271 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1272 } 1273 1274 static const struct file_operations raw6_seq_fops = { 1275 .owner = THIS_MODULE, 1276 .open = raw6_seq_open, 1277 .read = seq_read, 1278 .llseek = seq_lseek, 1279 .release = seq_release_net, 1280 }; 1281 1282 static int raw6_init_net(struct net *net) 1283 { 1284 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1285 return -ENOMEM; 1286 1287 return 0; 1288 } 1289 1290 static void raw6_exit_net(struct net *net) 1291 { 1292 proc_net_remove(net, "raw6"); 1293 } 1294 1295 static struct pernet_operations raw6_net_ops = { 1296 .init = raw6_init_net, 1297 .exit = raw6_exit_net, 1298 }; 1299 1300 int __init raw6_proc_init(void) 1301 { 1302 return register_pernet_subsys(&raw6_net_ops); 1303 } 1304 1305 void raw6_proc_exit(void) 1306 { 1307 unregister_pernet_subsys(&raw6_net_ops); 1308 } 1309 #endif /* CONFIG_PROC_FS */ 1310 1311 /* Same as inet6_dgram_ops, sans udp_poll. */ 1312 static const struct proto_ops inet6_sockraw_ops = { 1313 .family = PF_INET6, 1314 .owner = THIS_MODULE, 1315 .release = inet6_release, 1316 .bind = inet6_bind, 1317 .connect = inet_dgram_connect, /* ok */ 1318 .socketpair = sock_no_socketpair, /* a do nothing */ 1319 .accept = sock_no_accept, /* a do nothing */ 1320 .getname = inet6_getname, 1321 .poll = datagram_poll, /* ok */ 1322 .ioctl = inet6_ioctl, /* must change */ 1323 .listen = sock_no_listen, /* ok */ 1324 .shutdown = inet_shutdown, /* ok */ 1325 .setsockopt = sock_common_setsockopt, /* ok */ 1326 .getsockopt = sock_common_getsockopt, /* ok */ 1327 .sendmsg = inet_sendmsg, /* ok */ 1328 .recvmsg = sock_common_recvmsg, /* ok */ 1329 .mmap = sock_no_mmap, 1330 .sendpage = sock_no_sendpage, 1331 #ifdef CONFIG_COMPAT 1332 .compat_setsockopt = compat_sock_common_setsockopt, 1333 .compat_getsockopt = compat_sock_common_getsockopt, 1334 #endif 1335 }; 1336 1337 static struct inet_protosw rawv6_protosw = { 1338 .type = SOCK_RAW, 1339 .protocol = IPPROTO_IP, /* wild card */ 1340 .prot = &rawv6_prot, 1341 .ops = &inet6_sockraw_ops, 1342 .capability = CAP_NET_RAW, 1343 .no_check = UDP_CSUM_DEFAULT, 1344 .flags = INET_PROTOSW_REUSE, 1345 }; 1346 1347 int __init rawv6_init(void) 1348 { 1349 int ret; 1350 1351 ret = inet6_register_protosw(&rawv6_protosw); 1352 if (ret) 1353 goto out; 1354 out: 1355 return ret; 1356 } 1357 1358 void rawv6_exit(void) 1359 { 1360 inet6_unregister_protosw(&rawv6_protosw); 1361 } 1362