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 unsigned int hh_len; 613 int err; 614 615 if (length > rt->u.dst.dev->mtu) { 616 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu); 617 return -EMSGSIZE; 618 } 619 if (flags&MSG_PROBE) 620 goto out; 621 622 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 623 624 skb = sock_alloc_send_skb(sk, length+hh_len+15, 625 flags&MSG_DONTWAIT, &err); 626 if (skb == NULL) 627 goto error; 628 skb_reserve(skb, hh_len); 629 630 skb->priority = sk->sk_priority; 631 skb->mark = sk->sk_mark; 632 skb->dst = dst_clone(&rt->u.dst); 633 634 skb_put(skb, length); 635 skb_reset_network_header(skb); 636 iph = ipv6_hdr(skb); 637 638 skb->ip_summed = CHECKSUM_NONE; 639 640 skb->transport_header = skb->network_header; 641 err = memcpy_fromiovecend((void *)iph, from, 0, length); 642 if (err) 643 goto error_fault; 644 645 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 646 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 647 dst_output); 648 if (err > 0) 649 err = np->recverr ? net_xmit_errno(err) : 0; 650 if (err) 651 goto error; 652 out: 653 return 0; 654 655 error_fault: 656 err = -EFAULT; 657 kfree_skb(skb); 658 error: 659 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 660 return err; 661 } 662 663 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 664 { 665 struct iovec *iov; 666 u8 __user *type = NULL; 667 u8 __user *code = NULL; 668 u8 len = 0; 669 int probed = 0; 670 int i; 671 672 if (!msg->msg_iov) 673 return 0; 674 675 for (i = 0; i < msg->msg_iovlen; i++) { 676 iov = &msg->msg_iov[i]; 677 if (!iov) 678 continue; 679 680 switch (fl->proto) { 681 case IPPROTO_ICMPV6: 682 /* check if one-byte field is readable or not. */ 683 if (iov->iov_base && iov->iov_len < 1) 684 break; 685 686 if (!type) { 687 type = iov->iov_base; 688 /* check if code field is readable or not. */ 689 if (iov->iov_len > 1) 690 code = type + 1; 691 } else if (!code) 692 code = iov->iov_base; 693 694 if (type && code) { 695 if (get_user(fl->fl_icmp_type, type) || 696 get_user(fl->fl_icmp_code, code)) 697 return -EFAULT; 698 probed = 1; 699 } 700 break; 701 case IPPROTO_MH: 702 if (iov->iov_base && iov->iov_len < 1) 703 break; 704 /* check if type field is readable or not. */ 705 if (iov->iov_len > 2 - len) { 706 u8 __user *p = iov->iov_base; 707 if (get_user(fl->fl_mh_type, &p[2 - len])) 708 return -EFAULT; 709 probed = 1; 710 } else 711 len += iov->iov_len; 712 713 break; 714 default: 715 probed = 1; 716 break; 717 } 718 if (probed) 719 break; 720 } 721 return 0; 722 } 723 724 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 725 struct msghdr *msg, size_t len) 726 { 727 struct ipv6_txoptions opt_space; 728 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 729 struct in6_addr *daddr, *final_p = NULL, final; 730 struct inet_sock *inet = inet_sk(sk); 731 struct ipv6_pinfo *np = inet6_sk(sk); 732 struct raw6_sock *rp = raw6_sk(sk); 733 struct ipv6_txoptions *opt = NULL; 734 struct ip6_flowlabel *flowlabel = NULL; 735 struct dst_entry *dst = NULL; 736 struct flowi fl; 737 int addr_len = msg->msg_namelen; 738 int hlimit = -1; 739 int tclass = -1; 740 u16 proto; 741 int err; 742 743 /* Rough check on arithmetic overflow, 744 better check is made in ip6_append_data(). 745 */ 746 if (len > INT_MAX) 747 return -EMSGSIZE; 748 749 /* Mirror BSD error message compatibility */ 750 if (msg->msg_flags & MSG_OOB) 751 return -EOPNOTSUPP; 752 753 /* 754 * Get and verify the address. 755 */ 756 memset(&fl, 0, sizeof(fl)); 757 758 fl.mark = sk->sk_mark; 759 760 if (sin6) { 761 if (addr_len < SIN6_LEN_RFC2133) 762 return -EINVAL; 763 764 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 765 return(-EAFNOSUPPORT); 766 767 /* port is the proto value [0..255] carried in nexthdr */ 768 proto = ntohs(sin6->sin6_port); 769 770 if (!proto) 771 proto = inet->num; 772 else if (proto != inet->num) 773 return(-EINVAL); 774 775 if (proto > 255) 776 return(-EINVAL); 777 778 daddr = &sin6->sin6_addr; 779 if (np->sndflow) { 780 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 781 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { 782 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 783 if (flowlabel == NULL) 784 return -EINVAL; 785 daddr = &flowlabel->dst; 786 } 787 } 788 789 /* 790 * Otherwise it will be difficult to maintain 791 * sk->sk_dst_cache. 792 */ 793 if (sk->sk_state == TCP_ESTABLISHED && 794 ipv6_addr_equal(daddr, &np->daddr)) 795 daddr = &np->daddr; 796 797 if (addr_len >= sizeof(struct sockaddr_in6) && 798 sin6->sin6_scope_id && 799 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 800 fl.oif = sin6->sin6_scope_id; 801 } else { 802 if (sk->sk_state != TCP_ESTABLISHED) 803 return -EDESTADDRREQ; 804 805 proto = inet->num; 806 daddr = &np->daddr; 807 fl.fl6_flowlabel = np->flow_label; 808 } 809 810 if (fl.oif == 0) 811 fl.oif = sk->sk_bound_dev_if; 812 813 if (msg->msg_controllen) { 814 opt = &opt_space; 815 memset(opt, 0, sizeof(struct ipv6_txoptions)); 816 opt->tot_len = sizeof(struct ipv6_txoptions); 817 818 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass); 819 if (err < 0) { 820 fl6_sock_release(flowlabel); 821 return err; 822 } 823 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 824 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); 825 if (flowlabel == NULL) 826 return -EINVAL; 827 } 828 if (!(opt->opt_nflen|opt->opt_flen)) 829 opt = NULL; 830 } 831 if (opt == NULL) 832 opt = np->opt; 833 if (flowlabel) 834 opt = fl6_merge_options(&opt_space, flowlabel, opt); 835 opt = ipv6_fixup_options(&opt_space, opt); 836 837 fl.proto = proto; 838 err = rawv6_probe_proto_opt(&fl, msg); 839 if (err) 840 goto out; 841 842 if (!ipv6_addr_any(daddr)) 843 ipv6_addr_copy(&fl.fl6_dst, daddr); 844 else 845 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 846 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) 847 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 848 849 /* merge ip6_build_xmit from ip6_output */ 850 if (opt && opt->srcrt) { 851 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; 852 ipv6_addr_copy(&final, &fl.fl6_dst); 853 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 854 final_p = &final; 855 } 856 857 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) 858 fl.oif = np->mcast_oif; 859 security_sk_classify_flow(sk, &fl); 860 861 err = ip6_dst_lookup(sk, &dst, &fl); 862 if (err) 863 goto out; 864 if (final_p) 865 ipv6_addr_copy(&fl.fl6_dst, final_p); 866 867 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { 868 if (err == -EREMOTE) 869 err = ip6_dst_blackhole(sk, &dst, &fl); 870 if (err < 0) 871 goto out; 872 } 873 874 if (hlimit < 0) { 875 if (ipv6_addr_is_multicast(&fl.fl6_dst)) 876 hlimit = np->mcast_hops; 877 else 878 hlimit = np->hop_limit; 879 if (hlimit < 0) 880 hlimit = ip6_dst_hoplimit(dst); 881 } 882 883 if (tclass < 0) { 884 tclass = np->tclass; 885 if (tclass < 0) 886 tclass = 0; 887 } 888 889 if (msg->msg_flags&MSG_CONFIRM) 890 goto do_confirm; 891 892 back_from_confirm: 893 if (inet->hdrincl) { 894 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags); 895 } else { 896 lock_sock(sk); 897 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 898 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst, 899 msg->msg_flags); 900 901 if (err) 902 ip6_flush_pending_frames(sk); 903 else if (!(msg->msg_flags & MSG_MORE)) 904 err = rawv6_push_pending_frames(sk, &fl, rp); 905 release_sock(sk); 906 } 907 done: 908 dst_release(dst); 909 out: 910 fl6_sock_release(flowlabel); 911 return err<0?err:len; 912 do_confirm: 913 dst_confirm(dst); 914 if (!(msg->msg_flags & MSG_PROBE) || len) 915 goto back_from_confirm; 916 err = 0; 917 goto done; 918 } 919 920 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 921 char __user *optval, int optlen) 922 { 923 switch (optname) { 924 case ICMPV6_FILTER: 925 if (optlen > sizeof(struct icmp6_filter)) 926 optlen = sizeof(struct icmp6_filter); 927 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 928 return -EFAULT; 929 return 0; 930 default: 931 return -ENOPROTOOPT; 932 } 933 934 return 0; 935 } 936 937 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 938 char __user *optval, int __user *optlen) 939 { 940 int len; 941 942 switch (optname) { 943 case ICMPV6_FILTER: 944 if (get_user(len, optlen)) 945 return -EFAULT; 946 if (len < 0) 947 return -EINVAL; 948 if (len > sizeof(struct icmp6_filter)) 949 len = sizeof(struct icmp6_filter); 950 if (put_user(len, optlen)) 951 return -EFAULT; 952 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 953 return -EFAULT; 954 return 0; 955 default: 956 return -ENOPROTOOPT; 957 } 958 959 return 0; 960 } 961 962 963 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 964 char __user *optval, int optlen) 965 { 966 struct raw6_sock *rp = raw6_sk(sk); 967 int val; 968 969 if (get_user(val, (int __user *)optval)) 970 return -EFAULT; 971 972 switch (optname) { 973 case IPV6_CHECKSUM: 974 if (inet_sk(sk)->num == IPPROTO_ICMPV6 && 975 level == IPPROTO_IPV6) { 976 /* 977 * RFC3542 tells that IPV6_CHECKSUM socket 978 * option in the IPPROTO_IPV6 level is not 979 * allowed on ICMPv6 sockets. 980 * If you want to set it, use IPPROTO_RAW 981 * level IPV6_CHECKSUM socket option 982 * (Linux extension). 983 */ 984 return -EINVAL; 985 } 986 987 /* You may get strange result with a positive odd offset; 988 RFC2292bis agrees with me. */ 989 if (val > 0 && (val&1)) 990 return(-EINVAL); 991 if (val < 0) { 992 rp->checksum = 0; 993 } else { 994 rp->checksum = 1; 995 rp->offset = val; 996 } 997 998 return 0; 999 break; 1000 1001 default: 1002 return(-ENOPROTOOPT); 1003 } 1004 } 1005 1006 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1007 char __user *optval, int optlen) 1008 { 1009 switch(level) { 1010 case SOL_RAW: 1011 break; 1012 1013 case SOL_ICMPV6: 1014 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1015 return -EOPNOTSUPP; 1016 return rawv6_seticmpfilter(sk, level, optname, optval, 1017 optlen); 1018 case SOL_IPV6: 1019 if (optname == IPV6_CHECKSUM) 1020 break; 1021 default: 1022 return ipv6_setsockopt(sk, level, optname, optval, 1023 optlen); 1024 } 1025 1026 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1027 } 1028 1029 #ifdef CONFIG_COMPAT 1030 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1031 char __user *optval, int optlen) 1032 { 1033 switch (level) { 1034 case SOL_RAW: 1035 break; 1036 case SOL_ICMPV6: 1037 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1038 return -EOPNOTSUPP; 1039 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1040 case SOL_IPV6: 1041 if (optname == IPV6_CHECKSUM) 1042 break; 1043 default: 1044 return compat_ipv6_setsockopt(sk, level, optname, 1045 optval, optlen); 1046 } 1047 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1048 } 1049 #endif 1050 1051 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1052 char __user *optval, int __user *optlen) 1053 { 1054 struct raw6_sock *rp = raw6_sk(sk); 1055 int val, len; 1056 1057 if (get_user(len,optlen)) 1058 return -EFAULT; 1059 1060 switch (optname) { 1061 case IPV6_CHECKSUM: 1062 /* 1063 * We allow getsockopt() for IPPROTO_IPV6-level 1064 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1065 * since RFC3542 is silent about it. 1066 */ 1067 if (rp->checksum == 0) 1068 val = -1; 1069 else 1070 val = rp->offset; 1071 break; 1072 1073 default: 1074 return -ENOPROTOOPT; 1075 } 1076 1077 len = min_t(unsigned int, sizeof(int), len); 1078 1079 if (put_user(len, optlen)) 1080 return -EFAULT; 1081 if (copy_to_user(optval,&val,len)) 1082 return -EFAULT; 1083 return 0; 1084 } 1085 1086 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1087 char __user *optval, int __user *optlen) 1088 { 1089 switch(level) { 1090 case SOL_RAW: 1091 break; 1092 1093 case SOL_ICMPV6: 1094 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1095 return -EOPNOTSUPP; 1096 return rawv6_geticmpfilter(sk, level, optname, optval, 1097 optlen); 1098 case SOL_IPV6: 1099 if (optname == IPV6_CHECKSUM) 1100 break; 1101 default: 1102 return ipv6_getsockopt(sk, level, optname, optval, 1103 optlen); 1104 } 1105 1106 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1107 } 1108 1109 #ifdef CONFIG_COMPAT 1110 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1111 char __user *optval, int __user *optlen) 1112 { 1113 switch (level) { 1114 case SOL_RAW: 1115 break; 1116 case SOL_ICMPV6: 1117 if (inet_sk(sk)->num != IPPROTO_ICMPV6) 1118 return -EOPNOTSUPP; 1119 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1120 case SOL_IPV6: 1121 if (optname == IPV6_CHECKSUM) 1122 break; 1123 default: 1124 return compat_ipv6_getsockopt(sk, level, optname, 1125 optval, optlen); 1126 } 1127 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1128 } 1129 #endif 1130 1131 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1132 { 1133 switch(cmd) { 1134 case SIOCOUTQ: 1135 { 1136 int amount = atomic_read(&sk->sk_wmem_alloc); 1137 return put_user(amount, (int __user *)arg); 1138 } 1139 case SIOCINQ: 1140 { 1141 struct sk_buff *skb; 1142 int amount = 0; 1143 1144 spin_lock_bh(&sk->sk_receive_queue.lock); 1145 skb = skb_peek(&sk->sk_receive_queue); 1146 if (skb != NULL) 1147 amount = skb->tail - skb->transport_header; 1148 spin_unlock_bh(&sk->sk_receive_queue.lock); 1149 return put_user(amount, (int __user *)arg); 1150 } 1151 1152 default: 1153 #ifdef CONFIG_IPV6_MROUTE 1154 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1155 #else 1156 return -ENOIOCTLCMD; 1157 #endif 1158 } 1159 } 1160 1161 static void rawv6_close(struct sock *sk, long timeout) 1162 { 1163 if (inet_sk(sk)->num == IPPROTO_RAW) 1164 ip6_ra_control(sk, -1, NULL); 1165 ip6mr_sk_done(sk); 1166 sk_common_release(sk); 1167 } 1168 1169 static int rawv6_init_sk(struct sock *sk) 1170 { 1171 struct raw6_sock *rp = raw6_sk(sk); 1172 1173 switch (inet_sk(sk)->num) { 1174 case IPPROTO_ICMPV6: 1175 rp->checksum = 1; 1176 rp->offset = 2; 1177 break; 1178 case IPPROTO_MH: 1179 rp->checksum = 1; 1180 rp->offset = 4; 1181 break; 1182 default: 1183 break; 1184 } 1185 return(0); 1186 } 1187 1188 struct proto rawv6_prot = { 1189 .name = "RAWv6", 1190 .owner = THIS_MODULE, 1191 .close = rawv6_close, 1192 .connect = ip6_datagram_connect, 1193 .disconnect = udp_disconnect, 1194 .ioctl = rawv6_ioctl, 1195 .init = rawv6_init_sk, 1196 .destroy = inet6_destroy_sock, 1197 .setsockopt = rawv6_setsockopt, 1198 .getsockopt = rawv6_getsockopt, 1199 .sendmsg = rawv6_sendmsg, 1200 .recvmsg = rawv6_recvmsg, 1201 .bind = rawv6_bind, 1202 .backlog_rcv = rawv6_rcv_skb, 1203 .hash = raw_hash_sk, 1204 .unhash = raw_unhash_sk, 1205 .obj_size = sizeof(struct raw6_sock), 1206 .h.raw_hash = &raw_v6_hashinfo, 1207 #ifdef CONFIG_COMPAT 1208 .compat_setsockopt = compat_rawv6_setsockopt, 1209 .compat_getsockopt = compat_rawv6_getsockopt, 1210 #endif 1211 }; 1212 1213 #ifdef CONFIG_PROC_FS 1214 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1215 { 1216 struct ipv6_pinfo *np = inet6_sk(sp); 1217 struct in6_addr *dest, *src; 1218 __u16 destp, srcp; 1219 1220 dest = &np->daddr; 1221 src = &np->rcv_saddr; 1222 destp = 0; 1223 srcp = inet_sk(sp)->num; 1224 seq_printf(seq, 1225 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1226 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1227 i, 1228 src->s6_addr32[0], src->s6_addr32[1], 1229 src->s6_addr32[2], src->s6_addr32[3], srcp, 1230 dest->s6_addr32[0], dest->s6_addr32[1], 1231 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1232 sp->sk_state, 1233 atomic_read(&sp->sk_wmem_alloc), 1234 atomic_read(&sp->sk_rmem_alloc), 1235 0, 0L, 0, 1236 sock_i_uid(sp), 0, 1237 sock_i_ino(sp), 1238 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1239 } 1240 1241 static int raw6_seq_show(struct seq_file *seq, void *v) 1242 { 1243 if (v == SEQ_START_TOKEN) 1244 seq_printf(seq, 1245 " sl " 1246 "local_address " 1247 "remote_address " 1248 "st tx_queue rx_queue tr tm->when retrnsmt" 1249 " uid timeout inode drops\n"); 1250 else 1251 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1252 return 0; 1253 } 1254 1255 static const struct seq_operations raw6_seq_ops = { 1256 .start = raw_seq_start, 1257 .next = raw_seq_next, 1258 .stop = raw_seq_stop, 1259 .show = raw6_seq_show, 1260 }; 1261 1262 static int raw6_seq_open(struct inode *inode, struct file *file) 1263 { 1264 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1265 } 1266 1267 static const struct file_operations raw6_seq_fops = { 1268 .owner = THIS_MODULE, 1269 .open = raw6_seq_open, 1270 .read = seq_read, 1271 .llseek = seq_lseek, 1272 .release = seq_release_net, 1273 }; 1274 1275 static int raw6_init_net(struct net *net) 1276 { 1277 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1278 return -ENOMEM; 1279 1280 return 0; 1281 } 1282 1283 static void raw6_exit_net(struct net *net) 1284 { 1285 proc_net_remove(net, "raw6"); 1286 } 1287 1288 static struct pernet_operations raw6_net_ops = { 1289 .init = raw6_init_net, 1290 .exit = raw6_exit_net, 1291 }; 1292 1293 int __init raw6_proc_init(void) 1294 { 1295 return register_pernet_subsys(&raw6_net_ops); 1296 } 1297 1298 void raw6_proc_exit(void) 1299 { 1300 unregister_pernet_subsys(&raw6_net_ops); 1301 } 1302 #endif /* CONFIG_PROC_FS */ 1303 1304 /* Same as inet6_dgram_ops, sans udp_poll. */ 1305 static const struct proto_ops inet6_sockraw_ops = { 1306 .family = PF_INET6, 1307 .owner = THIS_MODULE, 1308 .release = inet6_release, 1309 .bind = inet6_bind, 1310 .connect = inet_dgram_connect, /* ok */ 1311 .socketpair = sock_no_socketpair, /* a do nothing */ 1312 .accept = sock_no_accept, /* a do nothing */ 1313 .getname = inet6_getname, 1314 .poll = datagram_poll, /* ok */ 1315 .ioctl = inet6_ioctl, /* must change */ 1316 .listen = sock_no_listen, /* ok */ 1317 .shutdown = inet_shutdown, /* ok */ 1318 .setsockopt = sock_common_setsockopt, /* ok */ 1319 .getsockopt = sock_common_getsockopt, /* ok */ 1320 .sendmsg = inet_sendmsg, /* ok */ 1321 .recvmsg = sock_common_recvmsg, /* ok */ 1322 .mmap = sock_no_mmap, 1323 .sendpage = sock_no_sendpage, 1324 #ifdef CONFIG_COMPAT 1325 .compat_setsockopt = compat_sock_common_setsockopt, 1326 .compat_getsockopt = compat_sock_common_getsockopt, 1327 #endif 1328 }; 1329 1330 static struct inet_protosw rawv6_protosw = { 1331 .type = SOCK_RAW, 1332 .protocol = IPPROTO_IP, /* wild card */ 1333 .prot = &rawv6_prot, 1334 .ops = &inet6_sockraw_ops, 1335 .capability = CAP_NET_RAW, 1336 .no_check = UDP_CSUM_DEFAULT, 1337 .flags = INET_PROTOSW_REUSE, 1338 }; 1339 1340 int __init rawv6_init(void) 1341 { 1342 int ret; 1343 1344 ret = inet6_register_protosw(&rawv6_protosw); 1345 if (ret) 1346 goto out; 1347 out: 1348 return ret; 1349 } 1350 1351 void rawv6_exit(void) 1352 { 1353 inet6_unregister_protosw(&rawv6_protosw); 1354 } 1355