1 /* 2 * RAW sockets for IPv6 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/raw.c 9 * 10 * Fixes: 11 * Hideaki YOSHIFUJI : sin6_scope_id support 12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) 13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/slab.h> 25 #include <linux/sockios.h> 26 #include <linux/net.h> 27 #include <linux/in6.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_arp.h> 30 #include <linux/icmpv6.h> 31 #include <linux/netfilter.h> 32 #include <linux/netfilter_ipv6.h> 33 #include <linux/skbuff.h> 34 #include <linux/compat.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)->inet_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 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 128 129 static mh_filter_t __rcu *mh_filter __read_mostly; 130 131 int rawv6_mh_filter_register(mh_filter_t filter) 132 { 133 rcu_assign_pointer(mh_filter, filter); 134 return 0; 135 } 136 EXPORT_SYMBOL(rawv6_mh_filter_register); 137 138 int rawv6_mh_filter_unregister(mh_filter_t filter) 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 mh_filter_t *filter; 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 rcu_read_lock(); 263 /* Check if the address belongs to the host. */ 264 if (addr_type != IPV6_ADDR_ANY) { 265 struct net_device *dev = NULL; 266 267 if (addr_type & IPV6_ADDR_LINKLOCAL) { 268 if (addr_len >= sizeof(struct sockaddr_in6) && 269 addr->sin6_scope_id) { 270 /* Override any existing binding, if another 271 * one is supplied by user. 272 */ 273 sk->sk_bound_dev_if = addr->sin6_scope_id; 274 } 275 276 /* Binding to link-local address requires an interface */ 277 if (!sk->sk_bound_dev_if) 278 goto out_unlock; 279 280 err = -ENODEV; 281 dev = dev_get_by_index_rcu(sock_net(sk), 282 sk->sk_bound_dev_if); 283 if (!dev) 284 goto out_unlock; 285 } 286 287 /* ipv4 addr of the socket is invalid. Only the 288 * unspecified and mapped address have a v4 equivalent. 289 */ 290 v4addr = LOOPBACK4_IPV6; 291 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 292 err = -EADDRNOTAVAIL; 293 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 294 dev, 0)) { 295 goto out_unlock; 296 } 297 } 298 } 299 300 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 301 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 302 if (!(addr_type & IPV6_ADDR_MULTICAST)) 303 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 304 err = 0; 305 out_unlock: 306 rcu_read_unlock(); 307 out: 308 release_sock(sk); 309 return err; 310 } 311 312 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 313 struct inet6_skb_parm *opt, 314 u8 type, u8 code, int offset, __be32 info) 315 { 316 struct inet_sock *inet = inet_sk(sk); 317 struct ipv6_pinfo *np = inet6_sk(sk); 318 int err; 319 int harderr; 320 321 /* Report error on raw socket, if: 322 1. User requested recverr. 323 2. Socket is connected (otherwise the error indication 324 is useless without recverr and error is hard. 325 */ 326 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 327 return; 328 329 harderr = icmpv6_err_convert(type, code, &err); 330 if (type == ICMPV6_PKT_TOOBIG) 331 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 332 333 if (np->recverr) { 334 u8 *payload = skb->data; 335 if (!inet->hdrincl) 336 payload += offset; 337 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 338 } 339 340 if (np->recverr || harderr) { 341 sk->sk_err = err; 342 sk->sk_error_report(sk); 343 } 344 } 345 346 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 347 u8 type, u8 code, int inner_offset, __be32 info) 348 { 349 struct sock *sk; 350 int hash; 351 struct in6_addr *saddr, *daddr; 352 struct net *net; 353 354 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 355 356 read_lock(&raw_v6_hashinfo.lock); 357 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 358 if (sk != NULL) { 359 /* Note: ipv6_hdr(skb) != skb->data */ 360 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data; 361 saddr = &ip6h->saddr; 362 daddr = &ip6h->daddr; 363 net = dev_net(skb->dev); 364 365 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 366 IP6CB(skb)->iif))) { 367 rawv6_err(sk, skb, NULL, type, code, 368 inner_offset, info); 369 sk = sk_next(sk); 370 } 371 } 372 read_unlock(&raw_v6_hashinfo.lock); 373 } 374 375 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb) 376 { 377 if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) && 378 skb_checksum_complete(skb)) { 379 atomic_inc(&sk->sk_drops); 380 kfree_skb(skb); 381 return NET_RX_DROP; 382 } 383 384 /* Charge it to the socket. */ 385 if (ip_queue_rcv_skb(sk, skb) < 0) { 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->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->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 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 466 return ipv6_recv_rxpmtu(sk, msg, len); 467 468 skb = skb_recv_datagram(sk, flags, noblock, &err); 469 if (!skb) 470 goto out; 471 472 copied = skb->len; 473 if (copied > len) { 474 copied = len; 475 msg->msg_flags |= MSG_TRUNC; 476 } 477 478 if (skb_csum_unnecessary(skb)) { 479 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 480 } else if (msg->msg_flags&MSG_TRUNC) { 481 if (__skb_checksum_complete(skb)) 482 goto csum_copy_err; 483 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 484 } else { 485 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 486 if (err == -EINVAL) 487 goto csum_copy_err; 488 } 489 if (err) 490 goto out_free; 491 492 /* Copy the address. */ 493 if (sin6) { 494 sin6->sin6_family = AF_INET6; 495 sin6->sin6_port = 0; 496 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 497 sin6->sin6_flowinfo = 0; 498 sin6->sin6_scope_id = 0; 499 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 500 sin6->sin6_scope_id = IP6CB(skb)->iif; 501 } 502 503 sock_recv_ts_and_drops(msg, sk, skb); 504 505 if (np->rxopt.all) 506 datagram_recv_ctl(sk, msg, skb); 507 508 err = copied; 509 if (flags & MSG_TRUNC) 510 err = skb->len; 511 512 out_free: 513 skb_free_datagram(sk, skb); 514 out: 515 return err; 516 517 csum_copy_err: 518 skb_kill_datagram(sk, skb, flags); 519 520 /* Error for blocking case is chosen to masquerade 521 as some normal condition. 522 */ 523 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 524 goto out; 525 } 526 527 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 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(&fl6->saddr, &fl6->daddr, 590 total_len, fl6->flowi6_proto, tmp_csum); 591 592 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 593 csum = CSUM_MANGLED_0; 594 595 if (skb_store_bits(skb, offset, &csum, 2)) 596 BUG(); 597 598 send: 599 err = ip6_push_pending_frames(sk); 600 out: 601 return err; 602 } 603 604 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 605 struct flowi6 *fl6, struct dst_entry **dstp, 606 unsigned int flags) 607 { 608 struct ipv6_pinfo *np = inet6_sk(sk); 609 struct ipv6hdr *iph; 610 struct sk_buff *skb; 611 int err; 612 struct rt6_info *rt = (struct rt6_info *)*dstp; 613 614 if (length > rt->dst.dev->mtu) { 615 ipv6_local_error(sk, EMSGSIZE, fl6, rt->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->dst.dev) + 15, 623 flags & MSG_DONTWAIT, &err); 624 if (skb == NULL) 625 goto error; 626 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev)); 627 628 skb->priority = sk->sk_priority; 629 skb->mark = sk->sk_mark; 630 skb_dst_set(skb, &rt->dst); 631 *dstp = NULL; 632 633 skb_put(skb, length); 634 skb_reset_network_header(skb); 635 iph = ipv6_hdr(skb); 636 637 skb->ip_summed = CHECKSUM_NONE; 638 639 skb->transport_header = skb->network_header; 640 err = memcpy_fromiovecend((void *)iph, from, 0, length); 641 if (err) 642 goto error_fault; 643 644 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 645 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, 646 rt->dst.dev, dst_output); 647 if (err > 0) 648 err = net_xmit_errno(err); 649 if (err) 650 goto error; 651 out: 652 return 0; 653 654 error_fault: 655 err = -EFAULT; 656 kfree_skb(skb); 657 error: 658 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 659 if (err == -ENOBUFS && !np->recverr) 660 err = 0; 661 return err; 662 } 663 664 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg) 665 { 666 struct iovec *iov; 667 u8 __user *type = NULL; 668 u8 __user *code = NULL; 669 u8 len = 0; 670 int probed = 0; 671 int i; 672 673 if (!msg->msg_iov) 674 return 0; 675 676 for (i = 0; i < msg->msg_iovlen; i++) { 677 iov = &msg->msg_iov[i]; 678 if (!iov) 679 continue; 680 681 switch (fl6->flowi6_proto) { 682 case IPPROTO_ICMPV6: 683 /* check if one-byte field is readable or not. */ 684 if (iov->iov_base && iov->iov_len < 1) 685 break; 686 687 if (!type) { 688 type = iov->iov_base; 689 /* check if code field is readable or not. */ 690 if (iov->iov_len > 1) 691 code = type + 1; 692 } else if (!code) 693 code = iov->iov_base; 694 695 if (type && code) { 696 if (get_user(fl6->fl6_icmp_type, type) || 697 get_user(fl6->fl6_icmp_code, code)) 698 return -EFAULT; 699 probed = 1; 700 } 701 break; 702 case IPPROTO_MH: 703 if (iov->iov_base && iov->iov_len < 1) 704 break; 705 /* check if type field is readable or not. */ 706 if (iov->iov_len > 2 - len) { 707 u8 __user *p = iov->iov_base; 708 if (get_user(fl6->fl6_mh_type, &p[2 - len])) 709 return -EFAULT; 710 probed = 1; 711 } else 712 len += iov->iov_len; 713 714 break; 715 default: 716 probed = 1; 717 break; 718 } 719 if (probed) 720 break; 721 } 722 return 0; 723 } 724 725 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 726 struct msghdr *msg, size_t len) 727 { 728 struct ipv6_txoptions opt_space; 729 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 730 struct in6_addr *daddr, *final_p, final; 731 struct inet_sock *inet = inet_sk(sk); 732 struct ipv6_pinfo *np = inet6_sk(sk); 733 struct raw6_sock *rp = raw6_sk(sk); 734 struct ipv6_txoptions *opt = NULL; 735 struct ip6_flowlabel *flowlabel = NULL; 736 struct dst_entry *dst = NULL; 737 struct flowi6 fl6; 738 int addr_len = msg->msg_namelen; 739 int hlimit = -1; 740 int tclass = -1; 741 int dontfrag = -1; 742 u16 proto; 743 int err; 744 745 /* Rough check on arithmetic overflow, 746 better check is made in ip6_append_data(). 747 */ 748 if (len > INT_MAX) 749 return -EMSGSIZE; 750 751 /* Mirror BSD error message compatibility */ 752 if (msg->msg_flags & MSG_OOB) 753 return -EOPNOTSUPP; 754 755 /* 756 * Get and verify the address. 757 */ 758 memset(&fl6, 0, sizeof(fl6)); 759 760 fl6.flowi6_mark = sk->sk_mark; 761 762 if (sin6) { 763 if (addr_len < SIN6_LEN_RFC2133) 764 return -EINVAL; 765 766 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 767 return -EAFNOSUPPORT; 768 769 /* port is the proto value [0..255] carried in nexthdr */ 770 proto = ntohs(sin6->sin6_port); 771 772 if (!proto) 773 proto = inet->inet_num; 774 else if (proto != inet->inet_num) 775 return -EINVAL; 776 777 if (proto > 255) 778 return -EINVAL; 779 780 daddr = &sin6->sin6_addr; 781 if (np->sndflow) { 782 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 783 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 784 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 785 if (flowlabel == NULL) 786 return -EINVAL; 787 daddr = &flowlabel->dst; 788 } 789 } 790 791 /* 792 * Otherwise it will be difficult to maintain 793 * sk->sk_dst_cache. 794 */ 795 if (sk->sk_state == TCP_ESTABLISHED && 796 ipv6_addr_equal(daddr, &np->daddr)) 797 daddr = &np->daddr; 798 799 if (addr_len >= sizeof(struct sockaddr_in6) && 800 sin6->sin6_scope_id && 801 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 802 fl6.flowi6_oif = sin6->sin6_scope_id; 803 } else { 804 if (sk->sk_state != TCP_ESTABLISHED) 805 return -EDESTADDRREQ; 806 807 proto = inet->inet_num; 808 daddr = &np->daddr; 809 fl6.flowlabel = np->flow_label; 810 } 811 812 if (fl6.flowi6_oif == 0) 813 fl6.flowi6_oif = sk->sk_bound_dev_if; 814 815 if (msg->msg_controllen) { 816 opt = &opt_space; 817 memset(opt, 0, sizeof(struct ipv6_txoptions)); 818 opt->tot_len = sizeof(struct ipv6_txoptions); 819 820 err = datagram_send_ctl(sock_net(sk), msg, &fl6, opt, &hlimit, 821 &tclass, &dontfrag); 822 if (err < 0) { 823 fl6_sock_release(flowlabel); 824 return err; 825 } 826 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 827 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 828 if (flowlabel == NULL) 829 return -EINVAL; 830 } 831 if (!(opt->opt_nflen|opt->opt_flen)) 832 opt = NULL; 833 } 834 if (opt == NULL) 835 opt = np->opt; 836 if (flowlabel) 837 opt = fl6_merge_options(&opt_space, flowlabel, opt); 838 opt = ipv6_fixup_options(&opt_space, opt); 839 840 fl6.flowi6_proto = proto; 841 err = rawv6_probe_proto_opt(&fl6, msg); 842 if (err) 843 goto out; 844 845 if (!ipv6_addr_any(daddr)) 846 ipv6_addr_copy(&fl6.daddr, daddr); 847 else 848 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 849 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 850 ipv6_addr_copy(&fl6.saddr, &np->saddr); 851 852 final_p = fl6_update_dst(&fl6, opt, &final); 853 854 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 855 fl6.flowi6_oif = np->mcast_oif; 856 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 857 858 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 859 if (IS_ERR(dst)) { 860 err = PTR_ERR(dst); 861 goto out; 862 } 863 if (hlimit < 0) { 864 if (ipv6_addr_is_multicast(&fl6.daddr)) 865 hlimit = np->mcast_hops; 866 else 867 hlimit = np->hop_limit; 868 if (hlimit < 0) 869 hlimit = ip6_dst_hoplimit(dst); 870 } 871 872 if (tclass < 0) 873 tclass = np->tclass; 874 875 if (dontfrag < 0) 876 dontfrag = np->dontfrag; 877 878 if (msg->msg_flags&MSG_CONFIRM) 879 goto do_confirm; 880 881 back_from_confirm: 882 if (inet->hdrincl) 883 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags); 884 else { 885 lock_sock(sk); 886 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 887 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst, 888 msg->msg_flags, dontfrag); 889 890 if (err) 891 ip6_flush_pending_frames(sk); 892 else if (!(msg->msg_flags & MSG_MORE)) 893 err = rawv6_push_pending_frames(sk, &fl6, rp); 894 release_sock(sk); 895 } 896 done: 897 dst_release(dst); 898 out: 899 fl6_sock_release(flowlabel); 900 return err<0?err:len; 901 do_confirm: 902 dst_confirm(dst); 903 if (!(msg->msg_flags & MSG_PROBE) || len) 904 goto back_from_confirm; 905 err = 0; 906 goto done; 907 } 908 909 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 910 char __user *optval, int optlen) 911 { 912 switch (optname) { 913 case ICMPV6_FILTER: 914 if (optlen > sizeof(struct icmp6_filter)) 915 optlen = sizeof(struct icmp6_filter); 916 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 917 return -EFAULT; 918 return 0; 919 default: 920 return -ENOPROTOOPT; 921 } 922 923 return 0; 924 } 925 926 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 927 char __user *optval, int __user *optlen) 928 { 929 int len; 930 931 switch (optname) { 932 case ICMPV6_FILTER: 933 if (get_user(len, optlen)) 934 return -EFAULT; 935 if (len < 0) 936 return -EINVAL; 937 if (len > sizeof(struct icmp6_filter)) 938 len = sizeof(struct icmp6_filter); 939 if (put_user(len, optlen)) 940 return -EFAULT; 941 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 942 return -EFAULT; 943 return 0; 944 default: 945 return -ENOPROTOOPT; 946 } 947 948 return 0; 949 } 950 951 952 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 953 char __user *optval, unsigned int optlen) 954 { 955 struct raw6_sock *rp = raw6_sk(sk); 956 int val; 957 958 if (get_user(val, (int __user *)optval)) 959 return -EFAULT; 960 961 switch (optname) { 962 case IPV6_CHECKSUM: 963 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 964 level == IPPROTO_IPV6) { 965 /* 966 * RFC3542 tells that IPV6_CHECKSUM socket 967 * option in the IPPROTO_IPV6 level is not 968 * allowed on ICMPv6 sockets. 969 * If you want to set it, use IPPROTO_RAW 970 * level IPV6_CHECKSUM socket option 971 * (Linux extension). 972 */ 973 return -EINVAL; 974 } 975 976 /* You may get strange result with a positive odd offset; 977 RFC2292bis agrees with me. */ 978 if (val > 0 && (val&1)) 979 return -EINVAL; 980 if (val < 0) { 981 rp->checksum = 0; 982 } else { 983 rp->checksum = 1; 984 rp->offset = val; 985 } 986 987 return 0; 988 break; 989 990 default: 991 return -ENOPROTOOPT; 992 } 993 } 994 995 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 996 char __user *optval, unsigned int optlen) 997 { 998 switch(level) { 999 case SOL_RAW: 1000 break; 1001 1002 case SOL_ICMPV6: 1003 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1004 return -EOPNOTSUPP; 1005 return rawv6_seticmpfilter(sk, level, optname, optval, 1006 optlen); 1007 case SOL_IPV6: 1008 if (optname == IPV6_CHECKSUM) 1009 break; 1010 default: 1011 return ipv6_setsockopt(sk, level, optname, optval, 1012 optlen); 1013 } 1014 1015 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1016 } 1017 1018 #ifdef CONFIG_COMPAT 1019 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1020 char __user *optval, unsigned int optlen) 1021 { 1022 switch (level) { 1023 case SOL_RAW: 1024 break; 1025 case SOL_ICMPV6: 1026 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1027 return -EOPNOTSUPP; 1028 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1029 case SOL_IPV6: 1030 if (optname == IPV6_CHECKSUM) 1031 break; 1032 default: 1033 return compat_ipv6_setsockopt(sk, level, optname, 1034 optval, optlen); 1035 } 1036 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1037 } 1038 #endif 1039 1040 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1041 char __user *optval, int __user *optlen) 1042 { 1043 struct raw6_sock *rp = raw6_sk(sk); 1044 int val, len; 1045 1046 if (get_user(len,optlen)) 1047 return -EFAULT; 1048 1049 switch (optname) { 1050 case IPV6_CHECKSUM: 1051 /* 1052 * We allow getsockopt() for IPPROTO_IPV6-level 1053 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1054 * since RFC3542 is silent about it. 1055 */ 1056 if (rp->checksum == 0) 1057 val = -1; 1058 else 1059 val = rp->offset; 1060 break; 1061 1062 default: 1063 return -ENOPROTOOPT; 1064 } 1065 1066 len = min_t(unsigned int, sizeof(int), len); 1067 1068 if (put_user(len, optlen)) 1069 return -EFAULT; 1070 if (copy_to_user(optval,&val,len)) 1071 return -EFAULT; 1072 return 0; 1073 } 1074 1075 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1076 char __user *optval, int __user *optlen) 1077 { 1078 switch(level) { 1079 case SOL_RAW: 1080 break; 1081 1082 case SOL_ICMPV6: 1083 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1084 return -EOPNOTSUPP; 1085 return rawv6_geticmpfilter(sk, level, optname, optval, 1086 optlen); 1087 case SOL_IPV6: 1088 if (optname == IPV6_CHECKSUM) 1089 break; 1090 default: 1091 return ipv6_getsockopt(sk, level, optname, optval, 1092 optlen); 1093 } 1094 1095 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1096 } 1097 1098 #ifdef CONFIG_COMPAT 1099 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1100 char __user *optval, int __user *optlen) 1101 { 1102 switch (level) { 1103 case SOL_RAW: 1104 break; 1105 case SOL_ICMPV6: 1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1107 return -EOPNOTSUPP; 1108 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1109 case SOL_IPV6: 1110 if (optname == IPV6_CHECKSUM) 1111 break; 1112 default: 1113 return compat_ipv6_getsockopt(sk, level, optname, 1114 optval, optlen); 1115 } 1116 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1117 } 1118 #endif 1119 1120 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1121 { 1122 switch(cmd) { 1123 case SIOCOUTQ: 1124 { 1125 int amount = sk_wmem_alloc_get(sk); 1126 1127 return put_user(amount, (int __user *)arg); 1128 } 1129 case SIOCINQ: 1130 { 1131 struct sk_buff *skb; 1132 int amount = 0; 1133 1134 spin_lock_bh(&sk->sk_receive_queue.lock); 1135 skb = skb_peek(&sk->sk_receive_queue); 1136 if (skb != NULL) 1137 amount = skb->tail - skb->transport_header; 1138 spin_unlock_bh(&sk->sk_receive_queue.lock); 1139 return put_user(amount, (int __user *)arg); 1140 } 1141 1142 default: 1143 #ifdef CONFIG_IPV6_MROUTE 1144 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1145 #else 1146 return -ENOIOCTLCMD; 1147 #endif 1148 } 1149 } 1150 1151 #ifdef CONFIG_COMPAT 1152 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1153 { 1154 switch (cmd) { 1155 case SIOCOUTQ: 1156 case SIOCINQ: 1157 return -ENOIOCTLCMD; 1158 default: 1159 #ifdef CONFIG_IPV6_MROUTE 1160 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1161 #else 1162 return -ENOIOCTLCMD; 1163 #endif 1164 } 1165 } 1166 #endif 1167 1168 static void rawv6_close(struct sock *sk, long timeout) 1169 { 1170 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1171 ip6_ra_control(sk, -1); 1172 ip6mr_sk_done(sk); 1173 sk_common_release(sk); 1174 } 1175 1176 static void raw6_destroy(struct sock *sk) 1177 { 1178 lock_sock(sk); 1179 ip6_flush_pending_frames(sk); 1180 release_sock(sk); 1181 1182 inet6_destroy_sock(sk); 1183 } 1184 1185 static int rawv6_init_sk(struct sock *sk) 1186 { 1187 struct raw6_sock *rp = raw6_sk(sk); 1188 1189 switch (inet_sk(sk)->inet_num) { 1190 case IPPROTO_ICMPV6: 1191 rp->checksum = 1; 1192 rp->offset = 2; 1193 break; 1194 case IPPROTO_MH: 1195 rp->checksum = 1; 1196 rp->offset = 4; 1197 break; 1198 default: 1199 break; 1200 } 1201 return 0; 1202 } 1203 1204 struct proto rawv6_prot = { 1205 .name = "RAWv6", 1206 .owner = THIS_MODULE, 1207 .close = rawv6_close, 1208 .destroy = raw6_destroy, 1209 .connect = ip6_datagram_connect, 1210 .disconnect = udp_disconnect, 1211 .ioctl = rawv6_ioctl, 1212 .init = rawv6_init_sk, 1213 .setsockopt = rawv6_setsockopt, 1214 .getsockopt = rawv6_getsockopt, 1215 .sendmsg = rawv6_sendmsg, 1216 .recvmsg = rawv6_recvmsg, 1217 .bind = rawv6_bind, 1218 .backlog_rcv = rawv6_rcv_skb, 1219 .hash = raw_hash_sk, 1220 .unhash = raw_unhash_sk, 1221 .obj_size = sizeof(struct raw6_sock), 1222 .h.raw_hash = &raw_v6_hashinfo, 1223 #ifdef CONFIG_COMPAT 1224 .compat_setsockopt = compat_rawv6_setsockopt, 1225 .compat_getsockopt = compat_rawv6_getsockopt, 1226 .compat_ioctl = compat_rawv6_ioctl, 1227 #endif 1228 }; 1229 1230 #ifdef CONFIG_PROC_FS 1231 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1232 { 1233 struct ipv6_pinfo *np = inet6_sk(sp); 1234 struct in6_addr *dest, *src; 1235 __u16 destp, srcp; 1236 1237 dest = &np->daddr; 1238 src = &np->rcv_saddr; 1239 destp = 0; 1240 srcp = inet_sk(sp)->inet_num; 1241 seq_printf(seq, 1242 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1243 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 1244 i, 1245 src->s6_addr32[0], src->s6_addr32[1], 1246 src->s6_addr32[2], src->s6_addr32[3], srcp, 1247 dest->s6_addr32[0], dest->s6_addr32[1], 1248 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1249 sp->sk_state, 1250 sk_wmem_alloc_get(sp), 1251 sk_rmem_alloc_get(sp), 1252 0, 0L, 0, 1253 sock_i_uid(sp), 0, 1254 sock_i_ino(sp), 1255 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1256 } 1257 1258 static int raw6_seq_show(struct seq_file *seq, void *v) 1259 { 1260 if (v == SEQ_START_TOKEN) 1261 seq_printf(seq, 1262 " sl " 1263 "local_address " 1264 "remote_address " 1265 "st tx_queue rx_queue tr tm->when retrnsmt" 1266 " uid timeout inode ref pointer drops\n"); 1267 else 1268 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1269 return 0; 1270 } 1271 1272 static const struct seq_operations raw6_seq_ops = { 1273 .start = raw_seq_start, 1274 .next = raw_seq_next, 1275 .stop = raw_seq_stop, 1276 .show = raw6_seq_show, 1277 }; 1278 1279 static int raw6_seq_open(struct inode *inode, struct file *file) 1280 { 1281 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1282 } 1283 1284 static const struct file_operations raw6_seq_fops = { 1285 .owner = THIS_MODULE, 1286 .open = raw6_seq_open, 1287 .read = seq_read, 1288 .llseek = seq_lseek, 1289 .release = seq_release_net, 1290 }; 1291 1292 static int __net_init raw6_init_net(struct net *net) 1293 { 1294 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1295 return -ENOMEM; 1296 1297 return 0; 1298 } 1299 1300 static void __net_exit raw6_exit_net(struct net *net) 1301 { 1302 proc_net_remove(net, "raw6"); 1303 } 1304 1305 static struct pernet_operations raw6_net_ops = { 1306 .init = raw6_init_net, 1307 .exit = raw6_exit_net, 1308 }; 1309 1310 int __init raw6_proc_init(void) 1311 { 1312 return register_pernet_subsys(&raw6_net_ops); 1313 } 1314 1315 void raw6_proc_exit(void) 1316 { 1317 unregister_pernet_subsys(&raw6_net_ops); 1318 } 1319 #endif /* CONFIG_PROC_FS */ 1320 1321 /* Same as inet6_dgram_ops, sans udp_poll. */ 1322 static const struct proto_ops inet6_sockraw_ops = { 1323 .family = PF_INET6, 1324 .owner = THIS_MODULE, 1325 .release = inet6_release, 1326 .bind = inet6_bind, 1327 .connect = inet_dgram_connect, /* ok */ 1328 .socketpair = sock_no_socketpair, /* a do nothing */ 1329 .accept = sock_no_accept, /* a do nothing */ 1330 .getname = inet6_getname, 1331 .poll = datagram_poll, /* ok */ 1332 .ioctl = inet6_ioctl, /* must change */ 1333 .listen = sock_no_listen, /* ok */ 1334 .shutdown = inet_shutdown, /* ok */ 1335 .setsockopt = sock_common_setsockopt, /* ok */ 1336 .getsockopt = sock_common_getsockopt, /* ok */ 1337 .sendmsg = inet_sendmsg, /* ok */ 1338 .recvmsg = sock_common_recvmsg, /* ok */ 1339 .mmap = sock_no_mmap, 1340 .sendpage = sock_no_sendpage, 1341 #ifdef CONFIG_COMPAT 1342 .compat_setsockopt = compat_sock_common_setsockopt, 1343 .compat_getsockopt = compat_sock_common_getsockopt, 1344 #endif 1345 }; 1346 1347 static struct inet_protosw rawv6_protosw = { 1348 .type = SOCK_RAW, 1349 .protocol = IPPROTO_IP, /* wild card */ 1350 .prot = &rawv6_prot, 1351 .ops = &inet6_sockraw_ops, 1352 .no_check = UDP_CSUM_DEFAULT, 1353 .flags = INET_PROTOSW_REUSE, 1354 }; 1355 1356 int __init rawv6_init(void) 1357 { 1358 int ret; 1359 1360 ret = inet6_register_protosw(&rawv6_protosw); 1361 if (ret) 1362 goto out; 1363 out: 1364 return ret; 1365 } 1366 1367 void rawv6_exit(void) 1368 { 1369 inet6_unregister_protosw(&rawv6_protosw); 1370 } 1371