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 #include <linux/export.h> 65 66 static struct raw_hashinfo raw_v6_hashinfo = { 67 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 68 }; 69 70 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 71 unsigned short num, const struct in6_addr *loc_addr, 72 const struct in6_addr *rmt_addr, int dif) 73 { 74 struct hlist_node *node; 75 int is_multicast = ipv6_addr_is_multicast(loc_addr); 76 77 sk_for_each_from(sk, node) 78 if (inet_sk(sk)->inet_num == num) { 79 struct ipv6_pinfo *np = inet6_sk(sk); 80 81 if (!net_eq(sock_net(sk), net)) 82 continue; 83 84 if (!ipv6_addr_any(&np->daddr) && 85 !ipv6_addr_equal(&np->daddr, rmt_addr)) 86 continue; 87 88 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 89 continue; 90 91 if (!ipv6_addr_any(&np->rcv_saddr)) { 92 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 93 goto found; 94 if (is_multicast && 95 inet6_mc_check(sk, loc_addr, rmt_addr)) 96 goto found; 97 continue; 98 } 99 goto found; 100 } 101 sk = NULL; 102 found: 103 return sk; 104 } 105 106 /* 107 * 0 - deliver 108 * 1 - block 109 */ 110 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb) 111 { 112 struct icmp6hdr *icmph; 113 struct raw6_sock *rp = raw6_sk(sk); 114 115 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) { 116 __u32 *data = &rp->filter.data[0]; 117 int bit_nr; 118 119 icmph = (struct icmp6hdr *) skb->data; 120 bit_nr = icmph->icmp6_type; 121 122 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0; 123 } 124 return 0; 125 } 126 127 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 128 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 129 130 static mh_filter_t __rcu *mh_filter __read_mostly; 131 132 int rawv6_mh_filter_register(mh_filter_t filter) 133 { 134 RCU_INIT_POINTER(mh_filter, filter); 135 return 0; 136 } 137 EXPORT_SYMBOL(rawv6_mh_filter_register); 138 139 int rawv6_mh_filter_unregister(mh_filter_t filter) 140 { 141 RCU_INIT_POINTER(mh_filter, NULL); 142 synchronize_rcu(); 143 return 0; 144 } 145 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 146 147 #endif 148 149 /* 150 * demultiplex raw sockets. 151 * (should consider queueing the skb in the sock receive_queue 152 * without calling rawv6.c) 153 * 154 * Caller owns SKB so we must make clones. 155 */ 156 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 157 { 158 const struct in6_addr *saddr; 159 const struct in6_addr *daddr; 160 struct sock *sk; 161 int delivered = 0; 162 __u8 hash; 163 struct net *net; 164 165 saddr = &ipv6_hdr(skb)->saddr; 166 daddr = saddr + 1; 167 168 hash = nexthdr & (MAX_INET_PROTOS - 1); 169 170 read_lock(&raw_v6_hashinfo.lock); 171 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 172 173 if (sk == NULL) 174 goto out; 175 176 net = dev_net(skb->dev); 177 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 178 179 while (sk) { 180 int filtered; 181 182 delivered = 1; 183 switch (nexthdr) { 184 case IPPROTO_ICMPV6: 185 filtered = icmpv6_filter(sk, skb); 186 break; 187 188 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) 189 case IPPROTO_MH: 190 { 191 /* XXX: To validate MH only once for each packet, 192 * this is placed here. It should be after checking 193 * xfrm policy, however it doesn't. The checking xfrm 194 * policy is placed in rawv6_rcv() because it is 195 * required for each socket. 196 */ 197 mh_filter_t *filter; 198 199 filter = rcu_dereference(mh_filter); 200 filtered = filter ? (*filter)(sk, skb) : 0; 201 break; 202 } 203 #endif 204 default: 205 filtered = 0; 206 break; 207 } 208 209 if (filtered < 0) 210 break; 211 if (filtered == 0) { 212 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 213 214 /* Not releasing hash table! */ 215 if (clone) { 216 nf_reset(clone); 217 rawv6_rcv(sk, clone); 218 } 219 } 220 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 221 IP6CB(skb)->iif); 222 } 223 out: 224 read_unlock(&raw_v6_hashinfo.lock); 225 return delivered; 226 } 227 228 int raw6_local_deliver(struct sk_buff *skb, int nexthdr) 229 { 230 struct sock *raw_sk; 231 232 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]); 233 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 234 raw_sk = NULL; 235 236 return raw_sk != NULL; 237 } 238 239 /* This cleans up af_inet6 a bit. -DaveM */ 240 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 241 { 242 struct inet_sock *inet = inet_sk(sk); 243 struct ipv6_pinfo *np = inet6_sk(sk); 244 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 245 __be32 v4addr = 0; 246 int addr_type; 247 int err; 248 249 if (addr_len < SIN6_LEN_RFC2133) 250 return -EINVAL; 251 addr_type = ipv6_addr_type(&addr->sin6_addr); 252 253 /* Raw sockets are IPv6 only */ 254 if (addr_type == IPV6_ADDR_MAPPED) 255 return -EADDRNOTAVAIL; 256 257 lock_sock(sk); 258 259 err = -EINVAL; 260 if (sk->sk_state != TCP_CLOSE) 261 goto out; 262 263 rcu_read_lock(); 264 /* Check if the address belongs to the host. */ 265 if (addr_type != IPV6_ADDR_ANY) { 266 struct net_device *dev = NULL; 267 268 if (addr_type & IPV6_ADDR_LINKLOCAL) { 269 if (addr_len >= sizeof(struct sockaddr_in6) && 270 addr->sin6_scope_id) { 271 /* Override any existing binding, if another 272 * one is supplied by user. 273 */ 274 sk->sk_bound_dev_if = addr->sin6_scope_id; 275 } 276 277 /* Binding to link-local address requires an interface */ 278 if (!sk->sk_bound_dev_if) 279 goto out_unlock; 280 281 err = -ENODEV; 282 dev = dev_get_by_index_rcu(sock_net(sk), 283 sk->sk_bound_dev_if); 284 if (!dev) 285 goto out_unlock; 286 } 287 288 /* ipv4 addr of the socket is invalid. Only the 289 * unspecified and mapped address have a v4 equivalent. 290 */ 291 v4addr = LOOPBACK4_IPV6; 292 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 293 err = -EADDRNOTAVAIL; 294 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 295 dev, 0)) { 296 goto out_unlock; 297 } 298 } 299 } 300 301 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 302 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 303 if (!(addr_type & IPV6_ADDR_MULTICAST)) 304 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 305 err = 0; 306 out_unlock: 307 rcu_read_unlock(); 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 u8 type, u8 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 u8 type, u8 code, int inner_offset, __be32 info) 349 { 350 struct sock *sk; 351 int hash; 352 const 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 const struct ipv6hdr *ip6h = (const 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 || rcu_access_pointer(sk->sk_filter)) && 379 skb_checksum_complete(skb)) { 380 atomic_inc(&sk->sk_drops); 381 kfree_skb(skb); 382 return NET_RX_DROP; 383 } 384 385 /* Charge it to the socket. */ 386 if (ip_queue_rcv_skb(sk, skb) < 0) { 387 kfree_skb(skb); 388 return NET_RX_DROP; 389 } 390 391 return 0; 392 } 393 394 /* 395 * This is next to useless... 396 * if we demultiplex in network layer we don't need the extra call 397 * just to queue the skb... 398 * maybe we could have the network decide upon a hint if it 399 * should call raw_rcv for demultiplexing 400 */ 401 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 402 { 403 struct inet_sock *inet = inet_sk(sk); 404 struct raw6_sock *rp = raw6_sk(sk); 405 406 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 407 atomic_inc(&sk->sk_drops); 408 kfree_skb(skb); 409 return NET_RX_DROP; 410 } 411 412 if (!rp->checksum) 413 skb->ip_summed = CHECKSUM_UNNECESSARY; 414 415 if (skb->ip_summed == CHECKSUM_COMPLETE) { 416 skb_postpull_rcsum(skb, skb_network_header(skb), 417 skb_network_header_len(skb)); 418 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 419 &ipv6_hdr(skb)->daddr, 420 skb->len, inet->inet_num, skb->csum)) 421 skb->ip_summed = CHECKSUM_UNNECESSARY; 422 } 423 if (!skb_csum_unnecessary(skb)) 424 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 425 &ipv6_hdr(skb)->daddr, 426 skb->len, 427 inet->inet_num, 0)); 428 429 if (inet->hdrincl) { 430 if (skb_checksum_complete(skb)) { 431 atomic_inc(&sk->sk_drops); 432 kfree_skb(skb); 433 return NET_RX_DROP; 434 } 435 } 436 437 rawv6_rcv_skb(sk, skb); 438 return 0; 439 } 440 441 442 /* 443 * This should be easy, if there is something there 444 * we return it, otherwise we block. 445 */ 446 447 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 448 struct msghdr *msg, size_t len, 449 int noblock, int flags, int *addr_len) 450 { 451 struct ipv6_pinfo *np = inet6_sk(sk); 452 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 453 struct sk_buff *skb; 454 size_t copied; 455 int err; 456 457 if (flags & MSG_OOB) 458 return -EOPNOTSUPP; 459 460 if (addr_len) 461 *addr_len=sizeof(*sin6); 462 463 if (flags & MSG_ERRQUEUE) 464 return ipv6_recv_error(sk, msg, len); 465 466 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 467 return ipv6_recv_rxpmtu(sk, msg, len); 468 469 skb = skb_recv_datagram(sk, flags, noblock, &err); 470 if (!skb) 471 goto out; 472 473 copied = skb->len; 474 if (copied > len) { 475 copied = len; 476 msg->msg_flags |= MSG_TRUNC; 477 } 478 479 if (skb_csum_unnecessary(skb)) { 480 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 481 } else if (msg->msg_flags&MSG_TRUNC) { 482 if (__skb_checksum_complete(skb)) 483 goto csum_copy_err; 484 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 485 } else { 486 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 487 if (err == -EINVAL) 488 goto csum_copy_err; 489 } 490 if (err) 491 goto out_free; 492 493 /* Copy the address. */ 494 if (sin6) { 495 sin6->sin6_family = AF_INET6; 496 sin6->sin6_port = 0; 497 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 498 sin6->sin6_flowinfo = 0; 499 sin6->sin6_scope_id = 0; 500 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 501 sin6->sin6_scope_id = IP6CB(skb)->iif; 502 } 503 504 sock_recv_ts_and_drops(msg, sk, skb); 505 506 if (np->rxopt.all) 507 datagram_recv_ctl(sk, msg, skb); 508 509 err = copied; 510 if (flags & MSG_TRUNC) 511 err = skb->len; 512 513 out_free: 514 skb_free_datagram(sk, skb); 515 out: 516 return err; 517 518 csum_copy_err: 519 skb_kill_datagram(sk, skb, flags); 520 521 /* Error for blocking case is chosen to masquerade 522 as some normal condition. 523 */ 524 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 525 goto out; 526 } 527 528 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 529 struct raw6_sock *rp) 530 { 531 struct sk_buff *skb; 532 int err = 0; 533 int offset; 534 int len; 535 int total_len; 536 __wsum tmp_csum; 537 __sum16 csum; 538 539 if (!rp->checksum) 540 goto send; 541 542 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 543 goto out; 544 545 offset = rp->offset; 546 total_len = inet_sk(sk)->cork.base.length; 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), sk, msg, &fl6, opt, 821 &hlimit, &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; 988 989 default: 990 return -ENOPROTOOPT; 991 } 992 } 993 994 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 995 char __user *optval, unsigned int optlen) 996 { 997 switch (level) { 998 case SOL_RAW: 999 break; 1000 1001 case SOL_ICMPV6: 1002 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1003 return -EOPNOTSUPP; 1004 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1005 case SOL_IPV6: 1006 if (optname == IPV6_CHECKSUM) 1007 break; 1008 default: 1009 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1010 } 1011 1012 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1013 } 1014 1015 #ifdef CONFIG_COMPAT 1016 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1017 char __user *optval, unsigned int optlen) 1018 { 1019 switch (level) { 1020 case SOL_RAW: 1021 break; 1022 case SOL_ICMPV6: 1023 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1024 return -EOPNOTSUPP; 1025 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1026 case SOL_IPV6: 1027 if (optname == IPV6_CHECKSUM) 1028 break; 1029 default: 1030 return compat_ipv6_setsockopt(sk, level, optname, 1031 optval, optlen); 1032 } 1033 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1034 } 1035 #endif 1036 1037 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1038 char __user *optval, int __user *optlen) 1039 { 1040 struct raw6_sock *rp = raw6_sk(sk); 1041 int val, len; 1042 1043 if (get_user(len,optlen)) 1044 return -EFAULT; 1045 1046 switch (optname) { 1047 case IPV6_CHECKSUM: 1048 /* 1049 * We allow getsockopt() for IPPROTO_IPV6-level 1050 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1051 * since RFC3542 is silent about it. 1052 */ 1053 if (rp->checksum == 0) 1054 val = -1; 1055 else 1056 val = rp->offset; 1057 break; 1058 1059 default: 1060 return -ENOPROTOOPT; 1061 } 1062 1063 len = min_t(unsigned int, sizeof(int), len); 1064 1065 if (put_user(len, optlen)) 1066 return -EFAULT; 1067 if (copy_to_user(optval,&val,len)) 1068 return -EFAULT; 1069 return 0; 1070 } 1071 1072 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1073 char __user *optval, int __user *optlen) 1074 { 1075 switch (level) { 1076 case SOL_RAW: 1077 break; 1078 1079 case SOL_ICMPV6: 1080 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1081 return -EOPNOTSUPP; 1082 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1083 case SOL_IPV6: 1084 if (optname == IPV6_CHECKSUM) 1085 break; 1086 default: 1087 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1088 } 1089 1090 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1091 } 1092 1093 #ifdef CONFIG_COMPAT 1094 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1095 char __user *optval, int __user *optlen) 1096 { 1097 switch (level) { 1098 case SOL_RAW: 1099 break; 1100 case SOL_ICMPV6: 1101 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1102 return -EOPNOTSUPP; 1103 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1104 case SOL_IPV6: 1105 if (optname == IPV6_CHECKSUM) 1106 break; 1107 default: 1108 return compat_ipv6_getsockopt(sk, level, optname, 1109 optval, optlen); 1110 } 1111 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1112 } 1113 #endif 1114 1115 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1116 { 1117 switch (cmd) { 1118 case SIOCOUTQ: { 1119 int amount = sk_wmem_alloc_get(sk); 1120 1121 return put_user(amount, (int __user *)arg); 1122 } 1123 case SIOCINQ: { 1124 struct sk_buff *skb; 1125 int amount = 0; 1126 1127 spin_lock_bh(&sk->sk_receive_queue.lock); 1128 skb = skb_peek(&sk->sk_receive_queue); 1129 if (skb != NULL) 1130 amount = skb->tail - skb->transport_header; 1131 spin_unlock_bh(&sk->sk_receive_queue.lock); 1132 return put_user(amount, (int __user *)arg); 1133 } 1134 1135 default: 1136 #ifdef CONFIG_IPV6_MROUTE 1137 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1138 #else 1139 return -ENOIOCTLCMD; 1140 #endif 1141 } 1142 } 1143 1144 #ifdef CONFIG_COMPAT 1145 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1146 { 1147 switch (cmd) { 1148 case SIOCOUTQ: 1149 case SIOCINQ: 1150 return -ENOIOCTLCMD; 1151 default: 1152 #ifdef CONFIG_IPV6_MROUTE 1153 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1154 #else 1155 return -ENOIOCTLCMD; 1156 #endif 1157 } 1158 } 1159 #endif 1160 1161 static void rawv6_close(struct sock *sk, long timeout) 1162 { 1163 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1164 ip6_ra_control(sk, -1); 1165 ip6mr_sk_done(sk); 1166 sk_common_release(sk); 1167 } 1168 1169 static void raw6_destroy(struct sock *sk) 1170 { 1171 lock_sock(sk); 1172 ip6_flush_pending_frames(sk); 1173 release_sock(sk); 1174 1175 inet6_destroy_sock(sk); 1176 } 1177 1178 static int rawv6_init_sk(struct sock *sk) 1179 { 1180 struct raw6_sock *rp = raw6_sk(sk); 1181 1182 switch (inet_sk(sk)->inet_num) { 1183 case IPPROTO_ICMPV6: 1184 rp->checksum = 1; 1185 rp->offset = 2; 1186 break; 1187 case IPPROTO_MH: 1188 rp->checksum = 1; 1189 rp->offset = 4; 1190 break; 1191 default: 1192 break; 1193 } 1194 return 0; 1195 } 1196 1197 struct proto rawv6_prot = { 1198 .name = "RAWv6", 1199 .owner = THIS_MODULE, 1200 .close = rawv6_close, 1201 .destroy = raw6_destroy, 1202 .connect = ip6_datagram_connect, 1203 .disconnect = udp_disconnect, 1204 .ioctl = rawv6_ioctl, 1205 .init = rawv6_init_sk, 1206 .setsockopt = rawv6_setsockopt, 1207 .getsockopt = rawv6_getsockopt, 1208 .sendmsg = rawv6_sendmsg, 1209 .recvmsg = rawv6_recvmsg, 1210 .bind = rawv6_bind, 1211 .backlog_rcv = rawv6_rcv_skb, 1212 .hash = raw_hash_sk, 1213 .unhash = raw_unhash_sk, 1214 .obj_size = sizeof(struct raw6_sock), 1215 .h.raw_hash = &raw_v6_hashinfo, 1216 #ifdef CONFIG_COMPAT 1217 .compat_setsockopt = compat_rawv6_setsockopt, 1218 .compat_getsockopt = compat_rawv6_getsockopt, 1219 .compat_ioctl = compat_rawv6_ioctl, 1220 #endif 1221 }; 1222 1223 #ifdef CONFIG_PROC_FS 1224 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1225 { 1226 struct ipv6_pinfo *np = inet6_sk(sp); 1227 const struct in6_addr *dest, *src; 1228 __u16 destp, srcp; 1229 1230 dest = &np->daddr; 1231 src = &np->rcv_saddr; 1232 destp = 0; 1233 srcp = inet_sk(sp)->inet_num; 1234 seq_printf(seq, 1235 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1236 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1237 i, 1238 src->s6_addr32[0], src->s6_addr32[1], 1239 src->s6_addr32[2], src->s6_addr32[3], srcp, 1240 dest->s6_addr32[0], dest->s6_addr32[1], 1241 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1242 sp->sk_state, 1243 sk_wmem_alloc_get(sp), 1244 sk_rmem_alloc_get(sp), 1245 0, 0L, 0, 1246 sock_i_uid(sp), 0, 1247 sock_i_ino(sp), 1248 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1249 } 1250 1251 static int raw6_seq_show(struct seq_file *seq, void *v) 1252 { 1253 if (v == SEQ_START_TOKEN) 1254 seq_printf(seq, 1255 " sl " 1256 "local_address " 1257 "remote_address " 1258 "st tx_queue rx_queue tr tm->when retrnsmt" 1259 " uid timeout inode ref pointer drops\n"); 1260 else 1261 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1262 return 0; 1263 } 1264 1265 static const struct seq_operations raw6_seq_ops = { 1266 .start = raw_seq_start, 1267 .next = raw_seq_next, 1268 .stop = raw_seq_stop, 1269 .show = raw6_seq_show, 1270 }; 1271 1272 static int raw6_seq_open(struct inode *inode, struct file *file) 1273 { 1274 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1275 } 1276 1277 static const struct file_operations raw6_seq_fops = { 1278 .owner = THIS_MODULE, 1279 .open = raw6_seq_open, 1280 .read = seq_read, 1281 .llseek = seq_lseek, 1282 .release = seq_release_net, 1283 }; 1284 1285 static int __net_init raw6_init_net(struct net *net) 1286 { 1287 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1288 return -ENOMEM; 1289 1290 return 0; 1291 } 1292 1293 static void __net_exit raw6_exit_net(struct net *net) 1294 { 1295 proc_net_remove(net, "raw6"); 1296 } 1297 1298 static struct pernet_operations raw6_net_ops = { 1299 .init = raw6_init_net, 1300 .exit = raw6_exit_net, 1301 }; 1302 1303 int __init raw6_proc_init(void) 1304 { 1305 return register_pernet_subsys(&raw6_net_ops); 1306 } 1307 1308 void raw6_proc_exit(void) 1309 { 1310 unregister_pernet_subsys(&raw6_net_ops); 1311 } 1312 #endif /* CONFIG_PROC_FS */ 1313 1314 /* Same as inet6_dgram_ops, sans udp_poll. */ 1315 static const struct proto_ops inet6_sockraw_ops = { 1316 .family = PF_INET6, 1317 .owner = THIS_MODULE, 1318 .release = inet6_release, 1319 .bind = inet6_bind, 1320 .connect = inet_dgram_connect, /* ok */ 1321 .socketpair = sock_no_socketpair, /* a do nothing */ 1322 .accept = sock_no_accept, /* a do nothing */ 1323 .getname = inet6_getname, 1324 .poll = datagram_poll, /* ok */ 1325 .ioctl = inet6_ioctl, /* must change */ 1326 .listen = sock_no_listen, /* ok */ 1327 .shutdown = inet_shutdown, /* ok */ 1328 .setsockopt = sock_common_setsockopt, /* ok */ 1329 .getsockopt = sock_common_getsockopt, /* ok */ 1330 .sendmsg = inet_sendmsg, /* ok */ 1331 .recvmsg = sock_common_recvmsg, /* ok */ 1332 .mmap = sock_no_mmap, 1333 .sendpage = sock_no_sendpage, 1334 #ifdef CONFIG_COMPAT 1335 .compat_setsockopt = compat_sock_common_setsockopt, 1336 .compat_getsockopt = compat_sock_common_getsockopt, 1337 #endif 1338 }; 1339 1340 static struct inet_protosw rawv6_protosw = { 1341 .type = SOCK_RAW, 1342 .protocol = IPPROTO_IP, /* wild card */ 1343 .prot = &rawv6_prot, 1344 .ops = &inet6_sockraw_ops, 1345 .no_check = UDP_CSUM_DEFAULT, 1346 .flags = INET_PROTOSW_REUSE, 1347 }; 1348 1349 int __init rawv6_init(void) 1350 { 1351 int ret; 1352 1353 ret = inet6_register_protosw(&rawv6_protosw); 1354 if (ret) 1355 goto out; 1356 out: 1357 return ret; 1358 } 1359 1360 void rawv6_exit(void) 1361 { 1362 inet6_unregister_protosw(&rawv6_protosw); 1363 } 1364